JPWO2019097717A1 - Magnification optics, optics, and methods of manufacturing variable magnification optics - Google Patents
Magnification optics, optics, and methods of manufacturing variable magnification optics Download PDFInfo
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Abstract
複数のレンズ群を有し、変倍時に各レンズ群の間隔が変化し、複数のレンズ群は、合焦の際移動する物体側合焦レンズ群と、物体側合焦レンズ群より像側に配置され、合焦の際物体側合焦レンズ群とは異なる軌跡で移動する少なくとも一つの像側合焦レンズ群とを有し、所定の条件式を満足することにより、広角端状態から望遠端状態への変倍時の収差変動、および無限遠物体から近距離物体への合焦時の収差変動を良好に抑制する変倍光学系を提供することができる。It has a plurality of lens groups, and the distance between each lens group changes at the time of magnification change. It has at least one image-side focusing lens group that is arranged and moves in a trajectory different from the object-side focusing lens group at the time of focusing, and by satisfying a predetermined conditional expression, the wide-angle end state to the telephoto end It is possible to provide a variable magnification optical system that satisfactorily suppresses aberration fluctuations during scaling to a state and aberration fluctuations during focusing from an infinity object to a short-range object.
Description
本発明は、変倍光学系、光学装置、および変倍光学系の製造方法に関する。 The present invention relates to a variable magnification optical system, an optical device, and a method for manufacturing a variable magnification optical system.
従来、写真用カメラ、電子スチルカメラ、ビデオカメラ等に適した変倍光学系が提案されている。例えば、特開2004−198529号公報を参照。しかしながら、従来の変倍光学系は、合焦の際、諸収差の変動を抑えることが充分ではなかった。 Conventionally, variable magnification optical systems suitable for photographic cameras, electronic still cameras, video cameras and the like have been proposed. For example, see JP-A-2004-198529. However, the conventional variable magnification optical system is not sufficient to suppress fluctuations in various aberrations during focusing.
本発明の第1の態様は、
複数のレンズ群を有し、
変倍時に前記各レンズ群の間隔が変化し、
前記複数のレンズ群は、合焦の際移動する物体側合焦レンズ群と、前記物体側合焦レンズ群より像側に配置され、合焦の際前記物体側合焦レンズ群とは異なる軌跡で移動する少なくとも一つの像側合焦レンズ群とを有し、
以下の条件式を満足する変倍光学系である。
MTF1/MTF2 < 5.0
0.2 < BFw/fw < 2.0
ただし、
MTF1:望遠端状態における無限遠物体から近距離物体への合焦の際の前記物体側合焦レンズ群の移動量の絶対値
MTF2:望遠端状態における無限遠物体から近距離物体への合焦の際の、前記像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の移動量の絶対値
BFw:広角端状態における前記変倍光学系のバックフォーカス
fw:広角端状態における前記変倍光学系の焦点距離The first aspect of the present invention is
It has multiple lens groups and
The distance between each lens group changes during magnification change,
The plurality of lens groups are arranged on the image side of the object-side focusing lens group that moves during focusing and the object-side focusing lens group, and have different trajectories from the object-side focusing lens group during focusing. Has at least one image-side focusing lens group that moves with
It is a variable magnification optical system that satisfies the following conditional expression.
MTF1 / MTF2 <5.0
0.2 <BFw / fw <2.0
However,
MTF1: Absolute value of the amount of movement of the object-side focusing lens group when focusing from an infinity object to a short-range object in the telephoto end state MTF2: Focusing from an infinity object to a short-range object in the telephoto end state Absolute value of the amount of movement of the focusing lens group arranged on the object side of the image-side focusing lens group at the time of BFw: Back focus fw of the variable magnification optical system in the wide-angle end state: In the wide-angle end state Focal length of the variable magnification optical system
また、本発明の第2の態様は、
複数のレンズ群を有する変倍光学系の製造方法であって、
変倍時に前記各レンズ群の間隔が変化するように構成し、
前記複数のレンズ群が、合焦の際移動する物体側合焦レンズ群と、前記物体側合焦レンズ群より像側に配置され、合焦の際前記物体側合焦レンズ群とは異なる軌跡で移動する少なくとも一つの像側合焦レンズ群とを有するように構成し、
以下の条件式を満足するように構成する変倍光学系の製造方法である。
MTF1/MTF2 < 5.0
0.2 < BFw/fw < 2.0
ただし、
MTF1:望遠端状態における無限遠物体から近距離物体への合焦の際の前記物体側合焦レンズ群の移動量の絶対値
MTF2:望遠端状態における無限遠物体から近距離物体への合焦の際の、前記像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の移動量の絶対値
BFw:広角端状態における前記変倍光学系のバックフォーカス
fw:広角端状態における前記変倍光学系の焦点距離The second aspect of the present invention is
A method for manufacturing a variable magnification optical system having a plurality of lens groups.
It is configured so that the distance between the lens groups changes when the magnification is changed.
The plurality of lens groups are arranged on the image side of the object-side focusing lens group that moves during focusing and the object-side focusing lens group, and have different trajectories from the object-side focusing lens group during focusing. Configured to have at least one image-side focusing lens group that moves with
It is a manufacturing method of a variable magnification optical system configured so as to satisfy the following conditional expression.
MTF1 / MTF2 <5.0
0.2 <BFw / fw <2.0
However,
MTF1: Absolute value of the amount of movement of the object-side focusing lens group when focusing from an infinity object to a short-range object in the telephoto end state MTF2: Focusing from an infinity object to a short-range object in the telephoto end state Absolute value of the amount of movement of the focusing lens group arranged on the object side of the image-side focusing lens group at the time of BFw: Back focus fw of the variable magnification optical system in the wide-angle end state: In the wide-angle end state Focal length of the variable magnification optical system
以下、本実施形態に係る変倍光学系、光学装置および変倍光学系の製造方法について説明する。
本実施形態の変倍光学系は、複数のレンズ群を有し、変倍時に前記各レンズ群の間隔が変化し、前記複数のレンズ群は、合焦の際移動する物体側合焦レンズ群と、前記物体側合焦レンズ群より像側に配置され、合焦の際前記物体側合焦レンズ群とは異なる軌跡で移動する少なくとも一つの像側合焦レンズ群とを有し、以下の条件式(1)および(2)を満足するように構成されている。
(1)MTF1/MTF2 < 5.0
(2)0.2 < BFw/fw < 2.0
ただし、
MTF1:望遠端状態における無限遠物体から近距離物体への合焦の際の前記物体側合焦レンズ群の移動量の絶対値
MTF2:望遠端状態における無限遠物体から近距離物体への合焦の際の、前記像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の移動量の絶対値
BFw:広角端状態における前記変倍光学系のバックフォーカス
fw:広角端状態における前記変倍光学系の焦点距離Hereinafter, a method for manufacturing the variable magnification optical system, the optical device, and the variable magnification optical system according to the present embodiment will be described.
The variable magnification optical system of the present embodiment has a plurality of lens groups, the distance between the lens groups changes at the time of magnification change, and the plurality of lens groups move on the object side focusing lens group during focusing. And at least one image-side focusing lens group that is arranged on the image side of the object-side focusing lens group and moves in a trajectory different from that of the object-side focusing lens group at the time of focusing. It is configured to satisfy the conditional equations (1) and (2).
(1) MTF1 / MTF2 <5.0
(2) 0.2 <BFw / fw <2.0
However,
MTF1: Absolute value of the amount of movement of the object-side focusing lens group when focusing from an infinity object to a short-range object in the telephoto end state MTF2: Focusing from an infinity object to a short-range object in the telephoto end state Absolute value of the amount of movement of the focusing lens group arranged on the object side of the image-side focusing lens group at the time of BFw: Back focus fw of the variable magnification optical system in the wide-angle end state: In the wide-angle end state Focal length of the variable magnification optical system
本実施形態の変倍光学系は、複数のレンズ群を有し、広角端状態から望遠端状態への変倍時に、各レンズ群の間隔を変化させることによって、変倍時の良好な収差補正を図ることができる。また、本実施形態の変倍光学系は、複数のレンズ群が、無限遠物体から近距離物体への合焦の際移動する物体側合焦レンズ群と、物体側合焦レンズ群より像側に配置され、合焦の際物体側合焦レンズ群とは異なる軌跡で移動する少なくとも一つの像側合焦レンズ群とを有することにより、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を効果的に抑えることができる。
なお、レンズ群とは、空気間隔で分離された、少なくとも1枚のレンズを有する部分をいう。また、レンズ成分とは、単レンズまたは接合レンズをいう。The variable magnification optical system of the present embodiment has a plurality of lens groups, and when the magnification is changed from the wide-angle end state to the telephoto end state, the spacing between the lens groups is changed to obtain good aberration correction at the time of change. Can be planned. Further, in the variable magnification optical system of the present embodiment, the object-side focusing lens group in which a plurality of lens groups move when focusing from an infinity object to a short-range object and the image side of the object-side focusing lens group. By having at least one image-side focusing lens group that moves in a trajectory different from that of the object-side focusing lens group during focusing, when focusing from an infinity object to a short-range object. Fluctuations in various aberrations such as spherical aberration can be effectively suppressed.
The lens group refers to a portion having at least one lens separated by an air interval. Further, the lens component means a single lens or a junction lens.
条件式(1)は、望遠端状態における無限遠物体から近距離物体への合焦の際の物体側合焦レンズ群の移動量の絶対値と、望遠端状態における無限遠物体から近距離物体への合焦の際の、像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の移動量の絶対値との比を規定するものである。本実施形態の変倍光学系は、この条件式(1)を満足することにより、無限遠物体から近距離物体への合焦の際の球面収差の変動を効果的に抑えることができる。 Conditional expression (1) is the absolute value of the movement amount of the focusing lens group on the object side when focusing from an infinity object to a short-distance object in the telephoto end state, and the infinity object to the short-distance object in the telephoto end state. It defines the ratio of the movement amount of the focusing lens group arranged on the object side of the image side focusing lens group to the absolute value at the time of focusing on the object. By satisfying this conditional expression (1), the variable magnification optical system of the present embodiment can effectively suppress fluctuations in spherical aberration during focusing from an infinity object to a short-distance object.
本実施形態の変倍光学系の条件式(1)の対応値が上限値を上回ると、像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群に対して物体側合焦レンズ群の移動量が大きくなりすぎてしまい、無限遠物体から近距離物体への合焦の際の球面収差の変動を補正することが困難となる。なお、条件式(1)の上限値を4.7に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(1)の上限値を4.5にすることが好ましい。また、条件式(1)の上限値を4.0、更に3.5、更に2.8、更に2.4にすることが好ましい。 When the corresponding value of the conditional expression (1) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the object side focusing is performed with respect to the focusing lens group arranged on the object side most of the image side focusing lens groups. The amount of movement of the lens group becomes too large, and it becomes difficult to correct the fluctuation of spherical aberration when focusing from an infinity object to a short-range object. By setting the upper limit value of the conditional expression (1) to 4.7, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (1) to 4.5. Further, it is preferable that the upper limit value of the conditional expression (1) is 4.0, further 3.5, further 2.8, and further 2.4.
また、本実施形態の効果を確実にするために、条件式(1)は、
2.0 < MTF1/MTF2 < 5.0
とすることが好ましい。このように条件式(1)の下限値を2.0に設定することにより、合焦の際の球面収差の変動をさらに効果的に抑えることができる。In addition, in order to ensure the effect of this embodiment, the conditional expression (1) is
2.0 <MTF1 / MTF2 <5.0
Is preferable. By setting the lower limit value of the conditional expression (1) to 2.0 in this way, fluctuations in spherical aberration during focusing can be suppressed more effectively.
条件式(2)は、広角端状態における変倍光学系のバックフォーカスと広角端状態における変倍光学系の焦点距離との比を規定するものである。本実施形態の変倍光学系は、この条件式(2)を満足することにより、広角端状態におけるコマ収差をはじめとする諸収差を効果的に補正することができる。
なお、バックフォーカスとは、最も像側のレンズ面から像面までの光軸上の距離である。The conditional expression (2) defines the ratio between the back focus of the variable magnification optical system in the wide-angle end state and the focal length of the variable magnification optical system in the wide-angle end state. By satisfying this conditional expression (2), the variable magnification optical system of the present embodiment can effectively correct various aberrations such as coma in the wide-angle end state.
The back focus is the distance on the optical axis from the lens surface on the image side to the image surface.
本実施形態の変倍光学系の条件式(2)の対応値が上限値を上回ると、広角端状態における焦点距離に対して広角端状態におけるバックフォーカスが大きくなり、広角端状態におけるコマ収差をはじめとする諸収差を補正することが困難となる。なお、条件式(2)の上限値を1.70に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式 (2)の上限値を1.40にすることが好ましい。また、条件式(2)の上限値を1.20、更に1.00、更に0.80にすることが好ましい。 When the corresponding value of the conditional expression (2) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the back focus in the wide-angle end state becomes larger than the focal length in the wide-angle end state, and coma aberration in the wide-angle end state is caused. It becomes difficult to correct various aberrations including the above. By setting the upper limit value of the conditional expression (2) to 1.70, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (2) to 1.40. Further, it is preferable that the upper limit value of the conditional expression (2) is 1.20, further 1.00, and further 0.80.
一方、本実施形態の変倍光学系の条件式(2)の対応値が下限値を下回ると、広角端状態における焦点距離に対して広角端状態におけるバックフォーカスが小さくなり、広角端状態におけるコマ収差をはじめとする諸収差を補正することが困難となる。また、鏡筒のメカ部材を配置するのが困難となる。なお、条件式(2)の下限値を0.30に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(2)の下限値を0.40にすることが好ましい。また、条件式(2)の下限値を0.45、更に0.50、更に0.55、更に0.60にすることが好ましい。
以上の構成により、広角端状態から望遠端状態への変倍時の収差変動、および無限遠物体から近距離物体への合焦の際の諸収差の変動を良好に抑えることができる変倍光学系を実現することができる。On the other hand, when the corresponding value of the conditional expression (2) of the variable magnification optical system of the present embodiment is less than the lower limit value, the back focus in the wide-angle end state becomes smaller than the focal length in the wide-angle end state, and the coma in the wide-angle end state. It becomes difficult to correct various aberrations including aberrations. In addition, it becomes difficult to arrange the mechanical member of the lens barrel. By setting the lower limit value of the conditional expression (2) to 0.30, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (2) to 0.40. Further, it is preferable that the lower limit value of the conditional expression (2) is 0.45, further 0.50, further 0.55, and further 0.60.
With the above configuration, the aberration fluctuation at the time of scaling from the wide-angle end state to the telephoto end state and the fluctuation of various aberrations at the time of focusing from an infinity object to a short-distance object can be satisfactorily suppressed. The system can be realized.
本実施形態の変倍光学系は、前記物体側合焦レンズ群および前記像側合焦レンズ群の少なくとも一つの合焦レンズ群が、少なくとも一つの負の屈折力を有するレンズを有し、以下の条件式(3)を満足することが望ましい。
(3)0.45 < (−fFN)/|fF| < 1.70
ただし、
fFN:前記物体側合焦レンズ群および前記像側合焦レンズ群内にあるレンズのうち、最も負の屈折力が強いレンズの焦点距離
fF:前記物体側合焦レンズ群および前記像側合焦レンズ群のうち、最も屈折力が強い合焦レンズ群の焦点距離In the variable magnification optical system of the present embodiment, at least one focusing lens group of the object-side focusing lens group and the image-side focusing lens group has at least one lens having a negative refractive power, and the following It is desirable to satisfy the conditional expression (3) of.
(3) 0.45 <(-fFN) / | fF | <1.70
However,
fFN: Focal length of the lens having the strongest negative refractive power among the lenses in the object-side focusing lens group and the image-side focusing lens group fF: The object-side focusing lens group and the image-side focusing lens group Focal length of the focusing lens group with the strongest refractive power among the lens groups
本実施形態の変倍光学系は、物体側合焦レンズ群および像側合焦レンズ群の少なくとも一つの合焦レンズ群が、少なくとも一つの負の屈折力を有するレンズを有することで、無限遠物体から近距離物体への合焦の際の球面収差や色収差の変動を抑えることができる。
上記条件式(3)は、物体側合焦レンズ群および像側合焦レンズ群内にあるレンズのうち、最も負の屈折力が強いレンズの焦点距離と、物体側合焦レンズ群および像側合焦レンズ群のうち、最も屈折力が強い合焦レンズ群の焦点距離との比を規定するものである。本実施形態の変倍光学系は、この条件式(3)を満足することにより、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることができる。In the chromatic aberration optical system of the present embodiment, at least one focusing lens group of the object-side focusing lens group and the image-side focusing lens group has at least one lens having a negative refractive power, so that the lens group has at least one negative refractive power. It is possible to suppress fluctuations in spherical aberration and chromatic aberration when focusing from an object to a short-range object.
The above conditional expression (3) is based on the focal length of the lens having the strongest negative refractive power among the lenses in the object-side focusing lens group and the image-side focusing lens group, and the object-side focusing lens group and the image-side focusing lens group. It defines the ratio to the focal length of the focusing lens group having the strongest refractive power among the focusing lens groups. By satisfying this conditional equation (3), the variable magnification optical system of the present embodiment can suppress fluctuations in various aberrations such as spherical aberration when focusing from an infinity object to a short-distance object. it can.
本実施形態の変倍光学系の条件式(3)の対応値が上限値を上回ると、物体側合焦レンズ群および像側合焦レンズ群のうち、最も屈折力が強い合焦レンズ群の屈折力が強くなりすぎ、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(3)の上限値を1.60に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(3)の上限値を1.50にすることが好ましい。また、条件式(3)の上限値を1.40、更に1.30、更に1.25にすることが好ましい。 When the corresponding value of the conditional expression (3) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the focusing lens group having the strongest refractive power among the object-side focusing lens group and the image-side focusing lens group The refractive power becomes too strong, and it becomes difficult to suppress fluctuations in various aberrations such as spherical aberration when focusing from an infinity object to a short-range object. By setting the upper limit value of the conditional expression (3) to 1.60, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (3) to 1.50. Further, it is preferable that the upper limit value of the conditional expression (3) is 1.40, further 1.30, and further 1.25.
一方、本実施形態の変倍光学系の条件式(3)の対応値が下限値を下回ると、物体側合焦レンズ群および像側合焦レンズ群内にあるレンズのうち、最も負の屈折力が強いレンズの屈折力が強くなりすぎ、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(3)の下限値を0.47に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(3)の下限値を0.50にすることが好ましい。また、条件式(3)の下限値を0.54、更に0.60にすることが好ましい。 On the other hand, when the corresponding value of the conditional expression (3) of the variable magnification optical system of the present embodiment is less than the lower limit value, the most negative refractive power among the lenses in the object-side focusing lens group and the image-side focusing lens group. The refractive power of a lens having a strong force becomes too strong, and it becomes difficult to suppress fluctuations in various aberrations such as spherical aberration when focusing from an infinity object to a short-range object. By setting the lower limit value of the conditional expression (3) to 0.47, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (3) to 0.50. Further, it is preferable that the lower limit value of the conditional expression (3) is 0.54 and further set to 0.60.
また、本実施形態の変倍光学系は、前記物体側合焦レンズ群が正の屈折力を有することが望ましい。この構成により、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることができる。 Further, in the variable magnification optical system of the present embodiment, it is desirable that the object-side focusing lens group has a positive refractive power. With this configuration, it is possible to suppress fluctuations in various aberrations such as spherical aberration when focusing from an infinite object to a short-distance object.
また、本実施形態の変倍光学系は、前記像側合焦レンズ群のうち最も像側に配置された合焦レンズ群が正の屈折力を有することが望ましい。この構成により、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることができる。 Further, in the variable magnification optical system of the present embodiment, it is desirable that the focusing lens group arranged on the image side of the image side focusing lens group has a positive refractive power. With this configuration, it is possible to suppress fluctuations in various aberrations such as spherical aberration when focusing from an infinite object to a short-distance object.
また、本実施形態の変倍光学系は、前記物体側合焦レンズ群が、一つまたは二つのレンズ成分で構成されていることが望ましい。この構成により、合焦レンズ群を小型軽量化できる。 Further, in the variable magnification optical system of the present embodiment, it is desirable that the object-side focusing lens group is composed of one or two lens components. With this configuration, the focusing lens group can be made smaller and lighter.
また、本実施形態の変倍光学系は、前記像側合焦レンズ群が、一つまたは二つのレンズ成分で構成されていることが望ましい。この構成により、合焦レンズ群を小型軽量化できる。 Further, in the variable magnification optical system of the present embodiment, it is desirable that the image-side focusing lens group is composed of one or two lens components. With this configuration, the focusing lens group can be made smaller and lighter.
また、本実施形態の変倍光学系は、最も物体側に、合焦の際固定の第1レンズ群を有することが望ましい。この構成により、鏡筒の大型化を抑制することできる。 Further, it is desirable that the variable magnification optical system of the present embodiment has a first lens group fixed at the time of focusing on the most object side. With this configuration, it is possible to suppress an increase in the size of the lens barrel.
また、本実施形態の変倍光学系は、前記物体側合焦レンズ群および前記像側合焦レンズ群の少なくとも一つの合焦レンズ群が、少なくとも一つの負の屈折力を有するレンズを有し、以下の条件式(4)を満足することが望ましい。
(4)0.65 < nP/nN < 1.10
ただし、
nP:前記物体側合焦レンズ群および前記像側合焦レンズ群内にあるレンズのうち、最も正の屈折力が強いレンズの屈折率
nN:前記物体側合焦レンズ群および前記像側合焦レンズ群内にあるレンズのうち、最も負の屈折力が強いレンズの屈折率Further, the variable magnification optical system of the present embodiment has a lens in which at least one focusing lens group of the object-side focusing lens group and the image-side focusing lens group has at least one negative refractive power. , It is desirable to satisfy the following conditional expression (4).
(4) 0.65 <nP / nN <1.10
However,
nP: Refractive coefficient of the lens having the strongest positive refractive power among the lenses in the object-side focusing lens group and the image-side focusing lens group nN: the object-side focusing lens group and the image-side focusing lens group Of the lenses in the lens group, the refractive power of the lens with the strongest negative power
本実施形態の変倍光学系は、物体側合焦レンズ群および像側合焦レンズ群の少なくとも一つの合焦レンズ群が、少なくとも一つの負の屈折力を有するレンズを有することで、無限遠物体から近距離物体への合焦の際の球面収差や色収差の変動を抑えることができる。
上記条件式(4)は、物体側合焦レンズ群および像側合焦レンズ群内にあるレンズのうち、最も正の屈折力が強いレンズの屈折率と、物体側合焦レンズ群および像側合焦レンズ群内にあるレンズのうち、最も負の屈折力が強いレンズの屈折率との比を規定するものである。本実施形態の変倍光学系は、この条件式(4)を満足することにより、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることができる。In the chromatic aberration optical system of the present embodiment, at least one focusing lens group of the object-side focusing lens group and the image-side focusing lens group has at least one lens having a negative refractive power, so that the lens group has at least one negative refractive power. It is possible to suppress fluctuations in spherical aberration and chromatic aberration when focusing from an object to a short-range object.
The above conditional expression (4) shows the refractive power of the lens having the strongest positive refractive power among the lenses in the object-side focusing lens group and the image-side focusing lens group, and the object-side focusing lens group and the image-side focusing lens group. It defines the ratio to the refractive power of the lens with the strongest negative refractive power among the lenses in the focusing lens group. By satisfying this conditional equation (4), the variable magnification optical system of the present embodiment can suppress fluctuations in various aberrations such as spherical aberration when focusing from an infinity object to a short-distance object. it can.
本実施形態の変倍光学系の条件式(4)の対応値が上限値を上回ると、物体側合焦レンズ群および像側合焦レンズ群内にあるレンズのうち、最も正の屈折力が強いレンズの正の屈折力が強くなりすぎ、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(4)の上限値を1.05に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(4)の上限値を1.03にすることが好ましい。また、条件式(4)の上限値を1.00、更に0.95にすることが好ましい。 When the corresponding value of the conditional expression (4) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the most positive refractive power among the lenses in the object-side focusing lens group and the image-side focusing lens group becomes The positive refractive power of a strong lens becomes too strong, and it becomes difficult to suppress fluctuations in various aberrations such as spherical aberration when focusing from an infinity object to a short-range object. By setting the upper limit value of the conditional expression (4) to 1.05, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (4) to 1.03. Further, it is preferable that the upper limit value of the conditional expression (4) is 1.00 and further 0.95.
一方、本実施形態の変倍光学系の条件式(4)の対応値が下限値を下回ると、物体側合焦レンズ群および像側合焦レンズ群内にあるレンズのうち、最も負の屈折力が強いレンズの負の屈折力が強くなりすぎ、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(4)の下限値を0.67に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(4)の下限値を0.70にすることが好ましい。また、条件式(4)の下限値を0.75、更に0.80、更に0.83にすることが好ましい。 On the other hand, when the corresponding value of the conditional expression (4) of the variable magnification optical system of the present embodiment is less than the lower limit value, the most negative refractive power among the lenses in the object-side focusing lens group and the image-side focusing lens group. The negative refractive power of a lens with a strong force becomes too strong, and it becomes difficult to suppress fluctuations in various aberrations such as spherical aberration when focusing from an infinity object to a short-range object. By setting the lower limit value of the conditional expression (4) to 0.67, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (4) to 0.70. Further, it is preferable that the lower limit value of the conditional expression (4) is 0.75, further 0.80, and further 0.83.
また、本実施形態の変倍光学系は、以下の条件式(5)を満足することが望ましい。
(5)0.40 < |fF1|/|f1| < 2.60
ただし、
fF1:前記物体側合焦レンズ群の焦点距離
f1:前記第1レンズ群の焦点距離Further, it is desirable that the variable magnification optical system of the present embodiment satisfies the following conditional expression (5).
(5) 0.40 << | fF1 | / | f1 | <2.60
However,
fF1: Focal length of the object-side focusing lens group f1: Focal length of the first lens group
条件式(5)は、物体側合焦レンズ群の焦点距離と第1レンズ群の焦点距離との比を規定するものである。本実施形態の変倍光学系は、この条件式(5)を満足することにより、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を効果的に抑え、広角端状態から望遠端状態への変倍の際の球面収差をはじめとする諸収差の変動を抑えることができる。 Conditional expression (5) defines the ratio between the focal length of the object-side focusing lens group and the focal length of the first lens group. By satisfying this conditional equation (5), the variable magnification optical system of the present embodiment effectively changes various aberrations such as spherical aberration when focusing from an infinity object to a short-range object. It is possible to suppress fluctuations in various aberrations such as spherical aberration when scaling from the wide-angle end state to the telephoto end state.
本実施形態の変倍光学系の条件式(5)の対応値が上限値を上回ると、第1レンズ群の屈折力が強くなり、広角端状態から望遠端状態への変倍の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(5)の上限値を2.55に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(5)の上限値を2.50にすることが好ましい。また、条件式(5)の上限値を2.30、更に2.10にすることが好ましい。 When the corresponding value of the conditional expression (5) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the first lens group becomes strong, and the spherical surface at the time of scaling from the wide-angle end state to the telephoto end state. It becomes difficult to suppress fluctuations in various aberrations including aberrations. By setting the upper limit value of the conditional expression (5) to 2.55, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (5) to 2.50. Further, it is preferable that the upper limit value of the conditional expression (5) is 2.30 and further 2.10.
一方、本実施形態の変倍光学系の条件式(5)の対応値が下限値を下回ると、物体側合焦レンズ群の屈折力が強くなり、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(5)の下限値を0.45に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(5)の下限値を0.47にすることが好ましい。また、条件式(5)の下限値を0.50、更に0.55、更に0.60にすることが好ましい。 On the other hand, when the corresponding value of the conditional expression (5) of the variable magnification optical system of the present embodiment is less than the lower limit value, the refractive power of the object-side focusing lens group becomes stronger, and the object is focused from an infinity object to a short-range object. In this case, it becomes difficult to suppress fluctuations in various aberrations such as spherical aberration. By setting the lower limit value of the conditional expression (5) to 0.45, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (5) to 0.47. Further, it is preferable that the lower limit value of the conditional expression (5) is 0.50, further 0.55, and further 0.60.
また、本実施形態の変倍光学系は、以下の条件式(6)を満足することが望ましい。
(6)0.20 < |fF2|/|f1| < 3.80
ただし、
fF2:前記像側合焦レンズ群のうち最も像側に配置された合焦レンズ群の焦点距離
f1:前記第1レンズ群の焦点距離Further, it is desirable that the variable magnification optical system of the present embodiment satisfies the following conditional expression (6).
(6) 0.20 << | fF2 | / | f1 | <3.80
However,
fF2: Focal length of the focusing lens group arranged on the image side of the image side focusing lens group f1: Focal length of the first lens group
条件式(6)は、像側合焦レンズ群のうち最も像側に配置された合焦レンズ群の焦点距離と第1レンズ群の焦点距離との比を規定するものである。本実施形態の変倍光学系は、この条件式(6)を満足することにより、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を効果的に抑え、広角端状態から望遠端状態への変倍の際の球面収差をはじめとする諸収差の変動を抑えることができる。 Conditional expression (6) defines the ratio between the focal length of the focusing lens group arranged on the image side of the image-side focusing lens group and the focal length of the first lens group. By satisfying this conditional equation (6), the variable magnification optical system of the present embodiment effectively changes various aberrations such as spherical aberration when focusing from an infinity object to a short-range object. It is possible to suppress fluctuations in various aberrations such as spherical aberration when scaling from the wide-angle end state to the telephoto end state.
本実施形態の変倍光学系の条件式(6)の対応値が上限値を上回ると、第1レンズ群の屈折力が強くなり、広角端状態から望遠端状態への変倍の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(6)の上限値を3.60に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(6)の上限値を3.40にすることが好ましい。また、条件式(6)の上限値を3.00、更に2.50、更に1.90にすることが好ましい。 When the corresponding value of the conditional expression (6) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the first lens group becomes strong, and the spherical surface at the time of scaling from the wide-angle end state to the telephoto end state. It becomes difficult to suppress fluctuations in various aberrations including aberrations. By setting the upper limit value of the conditional expression (6) to 3.60, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (6) to 3.40. Further, it is preferable that the upper limit value of the conditional expression (6) is 3.00, further 2.50, and further 1.90.
一方、本実施形態の変倍光学系の条件式(6)の対応値が下限値を下回ると、像側合焦レンズ群のうち最も像側に配置された合焦レンズ群の屈折力が強くなり、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(6)の下限値を0.25に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(6)の下限値を0.28にすることが好ましい。また、条件式(6)の下限値を0.50、更に0.70、更に0.90、更に1.20にすることが好ましい。 On the other hand, when the corresponding value of the conditional expression (6) of the variable magnification optical system of the present embodiment is less than the lower limit value, the refractive power of the focusing lens group arranged on the image side of the image side focusing lens group is strong. Therefore, it becomes difficult to suppress fluctuations in various aberrations such as spherical aberration when focusing from an infinity object to a short-range object. By setting the lower limit value of the conditional expression (6) to 0.25, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (6) to 0.28. Further, it is preferable that the lower limit value of the conditional expression (6) is 0.50, further 0.70, further 0.90, and further 1.20.
また、本実施形態の変倍光学系は、物体側合焦レンズ群は、物体側から順に、正の屈折力を有するレンズと、負の屈折力を有するレンズとから成ることが望ましい。この構成により、無限遠物体から近距離物体への合焦の際の球面収差や色収差の変動を効果的に抑えることができる。 Further, in the variable magnification optical system of the present embodiment, it is desirable that the object-side focusing lens group includes a lens having a positive refractive power and a lens having a negative refractive power in this order from the object side. With this configuration, fluctuations in spherical aberration and chromatic aberration during focusing from an infinite object to a short-distance object can be effectively suppressed.
また、本実施形態の変倍光学系は、開口絞りを有し、前記物体側合焦レンズ群は、前記開口絞りより像側に配置されていることが望ましい。この構成により、合焦レンズ群を軽量化することが出来る。 Further, it is desirable that the variable magnification optical system of the present embodiment has an aperture diaphragm, and the object-side focusing lens group is arranged on the image side of the aperture diaphragm. With this configuration, the focusing lens group can be reduced in weight.
また、本実施形態の変倍光学系は、以下の条件式(7)を満足することが望ましい。
(7)0.10 < |fF1|/ft < 3.00
ただし、
fF1:前記物体側合焦レンズ群の焦点距離
ft:望遠端状態における前記変倍光学系の焦点距離Further, it is desirable that the variable magnification optical system of the present embodiment satisfies the following conditional expression (7).
(7) 0.10 << | fF1 | / ft <3.00
However,
fF1: Focal length of the object-side focusing lens group ft: Focal length of the variable magnification optical system in the telephoto end state
条件式(7)は、物体側合焦レンズ群の焦点距離と望遠端状態における変倍光学系の焦点距離との比を規定するものである。本実施形態の変倍光学系は、この条件式(7)を満足することにより、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を効果的に抑えることができる。 The conditional expression (7) defines the ratio between the focal length of the focusing lens group on the object side and the focal length of the variable magnification optical system in the telephoto end state. By satisfying this conditional equation (7), the variable magnification optical system of the present embodiment effectively changes various aberrations such as spherical aberration when focusing from an infinity object to a short-range object. It can be suppressed.
本実施形態の変倍光学系の条件式(7)の対応値が上限値を上回ると、物体側合焦レンズ群の焦点距離が長くなり、無限遠物体から近距離物体への合焦の際の物体側合焦レンズ群の移動量が大きくなりすぎ、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を補正することが困難となる。なお、条件式(7)の上限値を2.80に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(7)の上限値を2.60にすることが好ましい。また、条件式(7)の上限値を2.20、更に1.90、更に1.60にすることが好ましい。 When the corresponding value of the conditional expression (7) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the focal length of the focusing lens group on the object side becomes long, and when focusing from an infinity object to a short-distance object. The amount of movement of the object-side focusing lens group becomes too large, and it becomes difficult to correct fluctuations in various aberrations such as spherical aberration when focusing from an infinity object to a short-range object. By setting the upper limit value of the conditional expression (7) to 2.80, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (7) to 2.60. Further, it is preferable that the upper limit value of the conditional expression (7) is 2.20, further 1.90, and further 1.60.
一方、本実施形態の変倍光学系の条件式(7)の対応値が下限値を下回ると、物体側合焦レンズ群の屈折力が強くなり、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(7)の下限値を0.12に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(7)の下限値を0.15にすることが好ましい。 On the other hand, when the corresponding value of the conditional expression (7) of the variable magnification optical system of the present embodiment is less than the lower limit value, the refractive power of the object-side focusing lens group becomes stronger, and the object is focused from an infinity object to a short-range object. In this case, it becomes difficult to suppress fluctuations in various aberrations such as spherical aberration. By setting the lower limit value of the conditional expression (7) to 0.12, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (7) to 0.15.
また、本実施形態の変倍光学系は、以下の条件式(8)を満足することが望ましい。
(8)0.10 < |fF2|/ft < 3.00
ただし、
fF2:前記像側合焦レンズ群のうち最も像側に配置された合焦レンズ群の焦点距離
ft:望遠端状態における前記変倍光学系の焦点距離Further, it is desirable that the variable magnification optical system of the present embodiment satisfies the following conditional expression (8).
(8) 0.10 << | fF2 | / ft <3.00
However,
fF2: Focal length of the focusing lens group arranged on the image side of the image side focusing lens group ft: Focal length of the variable magnification optical system in the telephoto end state
条件式(8)は、像側合焦レンズ群のうち最も像側に配置された合焦レンズ群の焦点距離と、望遠端状態における変倍光学系の焦点距離との比を規定するものである。本実施形態の変倍光学系は、この条件式(8)を満足することにより、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を効果的に抑えることができる。 Conditional expression (8) defines the ratio between the focal length of the focusing lens group arranged on the image side of the image-side focusing lens group and the focal length of the variable magnification optical system in the telephoto end state. is there. By satisfying this conditional expression (8), the variable magnification optical system of the present embodiment effectively changes various aberrations such as spherical aberration when focusing from an infinity object to a short-distance object. It can be suppressed.
本実施形態の変倍光学系の条件式(8)の対応値が上限値を上回ると、像側合焦レンズ群のうち最も像側に配置された合焦レンズ群の焦点距離が長くなり、無限遠物体から近距離物体への合焦の際の、最も像側に配置された合焦レンズ群の移動量が大きくなりすぎ、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を補正することが困難となる。なお、条件式(8)の上限値を2.80に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(8)の上限値を2.60にすることが好ましい。 When the corresponding value of the conditional expression (8) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the focal length of the focusing lens group arranged on the image side of the image side focusing lens group becomes long. When focusing from an infinity object to a short-range object, the amount of movement of the focusing lens group arranged on the image side becomes too large, and spherical aberration when focusing from an infinity object to a short-range object. It becomes difficult to correct fluctuations in various aberrations such as. By setting the upper limit value of the conditional expression (8) to 2.80, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (8) to 2.60.
一方、本実施形態の変倍光学系の条件式(8)の対応値が下限値を下回ると、像側合焦レンズ群のうち最も像側に配置された合焦レンズ群の屈折力が強くなり、無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(8)の下限値を0.12に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(8)の下限値を0.15にすることが好ましい。 On the other hand, when the corresponding value of the conditional expression (8) of the variable magnification optical system of the present embodiment is less than the lower limit value, the refractive power of the focusing lens group arranged on the image side of the image side focusing lens group is strong. Therefore, it becomes difficult to suppress fluctuations in various aberrations such as spherical aberration when focusing from an infinity object to a short-range object. By setting the lower limit value of the conditional expression (8) to 0.12, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (8) to 0.15.
また、本実施形態の変倍光学系は、以下の条件式(9)を満足することが望ましい。
(9)|βWF1|/|βWF2| < 4.00
ただし、
βWF1:無限遠物体合焦時の広角端状態における前記物体側合焦レンズ群の横倍率
βWF2:無限遠物体合焦時の広角端状態における、前記像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の横倍率Further, it is desirable that the variable magnification optical system of the present embodiment satisfies the following conditional expression (9).
(9) | βWF1 | / | βWF2 | <4.00
However,
βWF1: Lateral magnification of the object-side focusing lens group in the wide-angle end state when the object is in focus at infinity βWF2: The most object side of the image-side focusing lens group in the wide-angle end state when the infinity object is in focus Horizontal magnification of the arranged focusing lens group
条件式(9)は、無限遠物体合焦時の広角端状態における物体側合焦レンズ群の横倍率と、無限遠物体合焦時の広角端状態における、像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の横倍率との比を規定するものである。本実施形態の変倍光学系は、この条件式(9)を満足することにより、広角端状態における無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を効果的に抑えることができる。 Conditional expression (9) is the most among the lateral magnification of the object-side focusing lens group in the wide-angle end state when the object is in focus at infinity and the image-side focusing lens group in the wide-angle end state when the infinity object is in focus. It defines the ratio to the lateral magnification of the focusing lens group arranged on the object side. By satisfying this conditional expression (9), the variable magnification optical system of the present embodiment fluctuates various aberrations such as spherical aberration when focusing from an infinity object to a short-distance object in the wide-angle end state. Can be effectively suppressed.
本実施形態の変倍光学系の条件式(9)の対応値が上限値を上回ると、無限遠物体合焦時の広角端状態における、像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の横倍率に対して、無限遠物体合焦時の広角端状態における物体側合焦レンズ群の横倍率が大きくなり、広角端状態における無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(9)の上限値を3.50に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(9)の上限値を3.00にすることが好ましい。また、条件式(9)の上限値を2.50、更に2.00、更に1.50、更に1.20にすることが好ましい。 When the corresponding value of the conditional equation (9) of the variable magnification optical system of the present embodiment exceeds the upper limit value, it is arranged on the most object side of the image-side focusing lens group in the wide-angle end state at the time of focusing on an infinity object. The lateral magnification of the in-focus lens group on the object side in the wide-angle end state when the infinity object is in focus becomes larger than the lateral magnification of the in-focus lens group, and the infinity object to the short-range object in the wide-angle end state It becomes difficult to suppress fluctuations in various aberrations such as spherical aberration at the time of focusing. By setting the upper limit value of the conditional expression (9) to 3.50, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (9) to 3.00. Further, it is preferable that the upper limit value of the conditional expression (9) is 2.50, further 2.00, further 1.50, and further 1.20.
また、本実施形態の変倍光学系は、以下の条件式(10)を満足することが望ましい。
(10)|βRw|/|βRt| < 4.00
ただし、
βRw:無限遠物体合焦時の広角端状態における前記物体側合焦レンズ群から像面までの合成横倍率
βRt:無限遠物体合焦時の望遠端状態における前記物体側合焦レンズ群から像面までの合成横倍率Further, it is desirable that the variable magnification optical system of the present embodiment satisfies the following conditional equation (10).
(10) | βRw | / | βRt | <4.00
However,
βRw: Composite lateral magnification from the object-side focusing lens group to the image plane in the wide-angle end state when the infinity object is in focus βRt: Image from the object-side focusing lens group in the telephoto end state when the infinity object is in focus Composite horizontal magnification to the surface
条件式(10)は、無限遠物体合焦時の広角端状態における物体側合焦レンズ群から像面までの合成横倍率と、無限遠物体合焦時の望遠端状態における物体側合焦レンズ群から像面までの合成横倍率との比を規定するものである。本実施形態の変倍光学系は、この条件式(10)を満足することにより、広角端状態における無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を効果的に抑えることができる。 Conditional expression (10) shows the combined lateral magnification from the object-side focusing lens group to the image plane in the wide-angle end state when the object is in focus at infinity, and the object-side focusing lens in the telephoto end state when the infinity object is in focus. It defines the ratio to the composite lateral magnification from the group to the image plane. By satisfying this conditional equation (10), the variable magnification optical system of the present embodiment fluctuates various aberrations such as spherical aberration when focusing from an infinity object to a short-distance object in the wide-angle end state. Can be effectively suppressed.
本実施形態の変倍光学系の条件式(10)の対応値が上限値を上回ると、無限遠物体合焦時の望遠端状態における物体側合焦レンズ群から像面までの合成横倍率に対して、無限遠物体合焦時の広角端状態における物体側合焦レンズ群から像面までの合成横倍率が大きくなり、広角端状態における無限遠物体から近距離物体への合焦の際の球面収差をはじめとする諸収差の変動を抑えることが困難となる。なお、条件式(10)の上限値を3.50に設定することで、本実施形態の効果をより確実なものとすることができる。また、本実施形態の効果をより確実にするために、条件式(10)の上限値を3.00にすることが好ましい。また、条件式(10)の上限値を2.60、更に2.20、更に1.90にすることが好ましい。 When the corresponding value of the conditional expression (10) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the combined lateral magnification from the object-side focusing lens group to the image plane in the telephoto end state at the time of focusing on an infinity object is obtained. On the other hand, the combined lateral magnification from the object-side focusing lens group to the image plane in the wide-angle end state when focusing on an infinity object increases, and when focusing from an infinity object to a short-range object in the wide-angle end state. It becomes difficult to suppress fluctuations in various aberrations such as spherical aberration. By setting the upper limit value of the conditional expression (10) to 3.50, the effect of the present embodiment can be made more reliable. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (10) to 3.00. Further, it is preferable that the upper limit value of the conditional expression (10) is 2.60, further 2.20, and further 1.90.
また、本実施形態の変倍光学系は、以下の条件式(11)を満足することが望ましい。
(11)15.0°<ωw<85.0°
ただし、
ωw:広角端状態における前記変倍光学系の半画角Further, it is desirable that the variable magnification optical system of the present embodiment satisfies the following conditional expression (11).
(11) 15.0 ° <ωw <85.0 °
However,
ωw: Half angle of view of the variable magnification optical system in the wide-angle end state
条件式(11)は、広角端状態における画角の最適な値を規定する条件である。本実施形態の変倍光学系は、この条件式(11)を満足することにより、広い画角を有しつつ、コマ収差、歪曲収差、像面湾曲等の諸収差を良好に補正することができる。 The conditional expression (11) is a condition that defines the optimum value of the angle of view in the wide-angle end state. By satisfying this conditional expression (11), the variable magnification optical system of the present embodiment can satisfactorily correct various aberrations such as coma, distortion, and curvature of field while having a wide angle of view. it can.
本実施形態の効果を確実なものとするために、条件式(11)の上限値を80.0°にすることが好ましい。また、条件式(11)の上限値を75.0°、更に70.0°、更に65.0°にすることが好ましい。
本実施形態の効果を確実なものとするために、条件式(11)の下限値を16.0°にすることが好ましい。また、条件式(11)の下限値を17.0°、更に35.0°、更に37.0°、更に39.0°、更に40.0°、更に42.0°とすることが望ましい。In order to ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (11) to 80.0 °. Further, it is preferable that the upper limit value of the conditional expression (11) is 75.0 °, further 70.0 °, and further 65.0 °.
In order to ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (11) to 16.0 °. Further, it is desirable that the lower limit of the conditional expression (11) is 17.0 °, further 35.0 °, further 37.0 °, further 39.0 °, further 40.0 °, and further 42.0 °. ..
本実施形態の光学装置は、上述した構成の変倍光学系を有する。これにより、広角端状態から望遠端状態への変倍時の収差変動、ならびに無限遠物体から近距離物体への合焦時の収差変動を良好に抑えることができる光学装置を実現することができる。 The optical device of this embodiment has a variable magnification optical system having the above-described configuration. As a result, it is possible to realize an optical device capable of satisfactorily suppressing the aberration fluctuation at the time of scaling from the wide-angle end state to the telephoto end state and the aberration fluctuation at the time of focusing from an infinity object to a short-distance object. ..
本実施形態の変倍光学系の製造方法は、複数のレンズ群を有する変倍光学系の製造方法であって、変倍時に前記各レンズ群の間隔が変化するように構成し、前記複数のレンズ群が、合焦の際移動する物体側合焦レンズ群と、前記物体側合焦レンズ群より像側に配置され、合焦の際前記物体側合焦レンズ群とは異なる軌跡で移動する少なくとも1つの像側合焦レンズ群とを有するように構成し、以下の条件式(1)および(2)を満足するように構成する変倍光学系の製造方法である。
(1)MTF1/MTF2 < 5.0
(2)0.2 < BFw/fw < 2.0
ただし、
MTF1:望遠端状態における無限遠物体から近距離物体への合焦の際の前記物体側合焦レンズ群の移動量の絶対値
MTF2:望遠端状態における無限遠物体から近距離物体への合焦の際の、前記像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の移動量の絶対値
BFw:広角端状態における前記変倍光学系のバックフォーカス
fw:広角端状態における前記変倍光学系の焦点距離The method for manufacturing a variable magnification optical system according to the present embodiment is a method for manufacturing a variable magnification optical system having a plurality of lens groups, and is configured so that the interval between the lens groups changes at the time of magnification change. The lens group is arranged on the image side of the object-side focusing lens group that moves during focusing and the object-side focusing lens group, and moves in a trajectory different from that of the object-side focusing lens group during focusing. This is a method for manufacturing a variable magnification optical system which is configured to have at least one image-side focusing lens group and is configured to satisfy the following conditional equations (1) and (2).
(1) MTF1 / MTF2 <5.0
(2) 0.2 <BFw / fw <2.0
However,
MTF1: Absolute value of the amount of movement of the object-side focusing lens group when focusing from an infinity object to a short-range object in the telephoto end state MTF2: Focusing from an infinity object to a short-range object in the telephoto end state Absolute value of the amount of movement of the focusing lens group arranged on the object side of the image-side focusing lens group at the time of BFw: Back focus fw of the variable magnification optical system in the wide-angle end state: In the wide-angle end state Focal length of the variable magnification optical system
これにより、広角端状態から望遠端状態への変倍時の収差変動、ならびに無限遠物体から近距離物体への合焦時の収差変動を良好に抑えることができる変倍光学系を製造することができる。 As a result, it is possible to manufacture a variable magnification optical system capable of satisfactorily suppressing the aberration fluctuation at the time of scaling from the wide-angle end state to the telephoto end state and the aberration fluctuation at the time of focusing from an infinity object to a short-distance object. Can be done.
以下、本実施形態の数値実施例に係る変倍光学系を添付図面に基づいて説明する。
(第1実施例)
図1は第1実施例に係る変倍光学系の断面図である。なお、図1および後述する図4、図7、図10、図13、図16、図19、図22、図25、図28、図31中の矢印は、広角端状態(W)から望遠端状態(T)への変倍時の各レンズ群の移動軌跡を示している。
本実施例に係る変倍光学系は、物体側から順に、負屈折力を有する第1レンズ群G1と、正屈折力を有する第2レンズ群G2と、正屈折力を有する第3レンズ群G3と、開口絞りSと、負屈折力を有する第4レンズ群G4と、正屈折力を有する第5レンズ群G5と、正屈折力を有する第6レンズ群G6と、負屈折力を有する第7レンズ群G7とから構成されている。Hereinafter, the variable magnification optical system according to the numerical embodiment of the present embodiment will be described with reference to the accompanying drawings.
(First Example)
FIG. 1 is a cross-sectional view of the variable magnification optical system according to the first embodiment. The arrows in FIGS. 1, 7, 7, 10, 13, 16, 19, 19, 22, 25, 28, and 31, which will be described later, are from the wide-angle end state (W) to the telephoto end. The movement locus of each lens group at the time of scaling to the state (T) is shown.
In the variable magnification optical system according to the present embodiment, the first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side. The aperture aperture S, the fourth lens group G4 having a negative refractive power, the fifth lens group G5 having a positive refractive power, the sixth lens group G6 having a positive refractive power, and the seventh lens group having a negative refractive power. It is composed of a lens group G7.
第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と、両凹形状の負レンズL12と物体側に凸面を向けた正メニスカスレンズL13との接合負レンズとからなる。
第2レンズ群G2は、両凸形状の正レンズL21と物体側に凹面を向けた負メニスカスレンズL22との接合正レンズからなる。
第3レンズ群G3は、物体側に凸面を向けた負メニスカスレンズL31と両凸形状の正レンズL32との接合正レンズからなる。The first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side, a biconcave negative lens L12, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side. Consists of.
The second lens group G2 is composed of a biconvex positive lens L21 and a junction positive lens L22 having a negative meniscus lens L22 with a concave surface facing the object side.
The third lens group G3 is composed of a junction positive lens of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32.
第4レンズ群G4は、物体側から順に、両凹形状の負レンズL41と物体側に凸面を向けた正メニスカスレンズL42との接合負レンズと、物体側に凸面を向けた正メニスカスレンズL43とからなる。
第5レンズ群G5は、両凸形状の正レンズL51と物体側に凹面を向けた負メニスカスレンズL52との接合正レンズからなる。
第6レンズ群G6は、両凸形状の正レンズL61からなる。
第7レンズ群G7は、物体側に凹面を向けた負メニスカスレンズL71からなる。The fourth lens group G4 includes, in order from the object side, a junction negative lens of a biconcave negative lens L41 and a positive meniscus lens L42 having a convex surface facing the object side, and a positive meniscus lens L43 having a convex surface facing the object side. Consists of.
The fifth lens group G5 is composed of a biconvex positive lens L51 and a negative meniscus lens L52 with a concave surface facing the object side.
The sixth lens group G6 is composed of a biconvex positive lens L61.
The seventh lens group G7 is composed of a negative meniscus lens L71 with a concave surface facing the object side.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、第5レンズ群G5と第6レンズ群G6との間隔、および第6レンズ群G6と第7レンズ群G7との間隔が変化するように、第1レンズ群G1から第7レンズ群G7までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the seventh lens group G7 move along the optical axis so that the distance and the distance between the sixth lens group G6 and the seventh lens group G7 change.
本実施例に係る光学系では、合焦レンズ群として、第5レンズ群G5を光軸に沿って物体側へ移動させるとともに、第6レンズ群G6を第5レンズ群G5とは異なる軌跡で光軸に沿って物体側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fifth lens group G5 is moved to the object side along the optical axis, and the sixth lens group G6 is lighted with a trajectory different from that of the fifth lens group G5. Focusing from an infinity object to a short-range object is performed by moving it toward the object along the axis.
以下の表1に、本実施例に係る変倍光学系の諸元の値を掲げる。
表1において、fは焦点距離、BFはバックフォーカスすなわち最も像側のレンズ面から像面Iまでの光軸上の距離を示す。
[面データ]において、mは物体側から数えた光学面の順番、rは曲率半径、dは面間隔(第n面(nは整数)と第n+1面との間隔)、ndはd線(波長587.6nm)に対する屈折率、νdはd線(波長587.6nm)に対するアッベ数をそれぞれ示している。また、OPは物体面、可変は可変の面間隔、Sは開口絞り、Iは像面をそれぞれ示している。なお、曲率半径r=∞は平面を示している。空気の屈折率nd=1.00000の記載は省略している。また、レンズ面が非球面である場合には面番号に*印を付して曲率半径rの欄には近軸曲率半径を示している。Table 1 below lists the specifications of the variable magnification optical system according to this embodiment.
In Table 1, f indicates the focal length, and BF indicates the back focus, that is, the distance on the optical axis from the lens surface on the image side to the image surface I.
In [plane data], m is the order of the optical planes counted from the object side, r is the radius of curvature, d is the plane spacing (distance between the nth plane (n is an integer) and the n + 1 plane), and nd is the d line (d line). The refractive index with respect to the wavelength of 587.6 nm and νd indicate the Abbe number with respect to the d line (wavelength of 587.6 nm). Further, OP indicates an object surface, variable indicates a variable surface spacing, S indicates an aperture stop, and I indicates an image plane. The radius of curvature r = ∞ indicates a plane. The description of the refractive index of air nd = 1.00000 is omitted. When the lens surface is aspherical, the surface number is marked with * and the radius of curvature r indicates the paraxial radius of curvature.
[非球面データ]には、[面データ]に示した非球面について、その形状を次式で表した場合の非球面係数及び円錐定数を示す。
x=(h2/r)/[1+{1−κ(h/r)2}1/2]
+A4h4+A6h6+A8h8+A10h10
ここで、hを光軸に垂直な方向の高さ、xを高さhにおける非球面の頂点の接平面から当該非球面までの光軸方向に沿った距離であるサグ量、κを円錐定数、A4,A6,A8,A10を非球面係数、rを基準球面の曲率半径である近軸曲率半径とする。なお、「E−n」(n:整数)は「×10−n」を示し、例えば「1.234E-05」は「1.234×10−5」を示す。2次の非球面係数A2は0であり、記載を省略している。[Aspherical data] shows the aspherical coefficient and the conical constant when the shape of the aspherical surface shown in [Surface data] is expressed by the following equation.
x = (h 2 / r) / [1 + {1-κ (h / r) 2 } 1/2 ]
+ A4h 4 + A6h 6 + A8h 8 + A10h 10
Here, h is the height in the direction perpendicular to the optical axis, x is the sag amount which is the distance from the tangent plane of the apex of the aspherical surface at the height h along the optical axis direction, and κ is the cone constant. , A4, A6, A8, A10 are the aspherical elements, and r is the near-axis radius of curvature, which is the radius of curvature of the reference sphere. In addition, "E-n" (n: integer) indicates "x10- n ", for example, "1.234E-05" indicates "1.234 × 10-5 ". The second-order aspherical coefficient A2 is 0, and the description is omitted.
[各種データ]において、fはレンズ全系の焦点距離、FNOはFナンバー、2ωは画角(単位は「°」)、Ymaxは最大像高、TLは本実施例に係る変倍光学系の全長すなわち第1面から像面Iまでの光軸上の距離、βは物体と像間の結像倍率、d0は物体面OPから第1面までの光軸上の距離、d0=0.000は無限遠即ち無限遠物体への合焦時、d0=641.690等は近距離即ち近距離物体への合焦時、dnは第n面と第n+1面との可変の間隔をそれぞれ示す。なお、f,βは無限遠ではf、近距離ではβ、Wは広角端状態、Mは中間焦点距離状態、Tは望遠端状態をそれぞれ示す。
[レンズ群データ]には、各レンズ群の始面番号STと焦点距離fを示す。
[条件式対応値]には、本実施例に係る変倍光学系の各条件式の対応値を示す。In [various data], f is the focal length of the entire lens system, FNO is the F number, 2ω is the angle of view (unit is "°"), Ymax is the maximum image height, and TL is the variable magnification optical system according to this embodiment. The total length, that is, the distance on the optical axis from the first plane to the image plane I, β is the imaging magnification between the object and the image, d0 is the distance on the optical axis from the object plane OP to the first plane, and d0 = 0.000 is infinite. When focusing on a distant or infinite object, d0 = 641.690 etc. indicates a short distance, that is, when focusing on a short-range object, and dn indicates a variable interval between the nth plane and the n + 1th plane. Note that f and β indicate f at infinity, β and W at short distances indicate the wide-angle end state, M indicates the intermediate focal length state, and T indicates the telephoto end state.
[Lens group data] shows the start surface number ST and the focal length f of each lens group.
[Conditional expression corresponding value] shows the corresponding value of each conditional expression of the variable magnification optical system according to this embodiment.
ここで、表1に掲載されている焦点距離f、曲率半径r及びその他の長さの単位は一般に「mm」が使われる。しかしながら光学系は、比例拡大又は比例縮小しても同等の光学性能が得られるため、これに限られるものではない。
なお、以上に述べた表1の符号は、後述する各実施例の表においても同様に用いるものとする。Here, "mm" is generally used as the unit of the focal length f, the radius of curvature r and other lengths listed in Table 1. However, the optical system is not limited to this because the same optical performance can be obtained even if the optical system is proportionally expanded or decreased.
The reference numerals in Table 1 described above shall be similarly used in the tables of the respective examples described later.
(表1)第1実施例
[面データ]
m r d nd νd
OP ∞
1 270.0000 2.900 1.74389 49.53
* 2 33.2562 13.215
3 -1900.2102 2.100 1.59349 67.00
4 35.8236 7.700 2.00100 29.12
5 79.6938 可変
6 271.3181 7.400 1.83481 42.73
7 -36.9149 1.500 1.75520 27.57
8 164.0000 可変
9 39.7511 1.500 1.85000 27.03
10 25.6246 10.800 1.59319 67.90
11 -134.6401 可変
12(S) ∞ 2.350
13 -65.9523 1.300 1.80100 34.92
14 18.5797 4.700 1.90366 31.27
15 51.6074 0.919
16 45.9293 2.500 1.94595 17.98
17 120.0000 可変
18 47.5350 7.100 1.48749 70.31
19 -24.2409 1.300 1.69895 30.13
20 -74.7188 可変
21 113.0000 4.200 1.58913 61.15
*22 -108.0000 可変
*23 -30.5616 1.500 1.58913 61.15
24 -81.9388 BF
I ∞
[非球面データ]
m:2
κ = 0.0000
A4 = 2.97162E-06
A6 = 1.62510E-09
A8 = 2.42658E-13
A10 = 4.56491E-16
A12 = 8.02650E-19
m:22
κ = 1.0000
A4 = 8.43912E-06
A6 = 6.68890E-10
A8 = 1.69267E-11
A10 = -5.36609E-14
m:23
κ = 1.0000
A4 = 8.13845E-06
A6 = -4.05875E-09
A8 = 1.66491E-11
A10 = -5.84964E-14
[各種データ]
変倍比 2.99
W M T
f 22.7 50.0 67.9
FNO 2.92 2.92 2.92
2ω 91.10 45.68 33.64
Ymax 19.32 21.60 21.60
TL 188.45 157.95 163.95
BF 11.75 20.19 25.26
W M T W M T
f,β 22.700 50.000 67.900 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 641.690 1469.10 2002.79
d5 63.985 10.998 3.100 63.985 10.998 3.100
d8 1.000 1.763 1.000 1.000 1.763 1.000
d11 1.900 12.973 26.707 1.900 12.973 26.707
d17 20.431 12.752 12.052 20.013 11.839 10.654
d20 8.701 16.480 16.780 8.112 16.125 16.831
d22 7.699 9.815 6.069 8.705 11.084 7.415
[レンズ群データ]
群 ST f
1 1 -46.132
2 6 102.733
3 9 64.434
4 12 -89.031
5 18 92.237
6 21 94.399
7 23 -83.639
[条件式対応値]
(1) MTF1/MTF2 =1.038
(2) BFw/fw =0.518
(3) (−fFN)/|fF|= 0.563
(4) nP/nN= 0.876
(5) |fF1|/|f1| =1.999
(6) |fF2|/|f1| =2.046
(7) |fF1|/ft =1.358
(8) |fF2|/ft =1.390
(9) |βWF1|/|βWF2| =0.719
(10) |βRw|/|βRt| = 1.616
(11) ωw = 45.55°(Table 1) First Example [Surface data]
m r d nd ν d
OP ∞
1 270.0000 2.900 1.74389 49.53
* 2 33.2562 13.215
3-1900.2102 2.100 1.59349 67.00
4 35.8236 7.700 2.00100 29.12
5 79.6938 Variable
6 271.3181 7.400 1.83481 42.73
7 -36.9149 1.500 1.75520 27.57
8 164.0000 Variable
9 39.7511 1.500 1.85000 27.03
10 25.6246 10.800 1.59319 67.90
11 -134.6401 Variable
12 (S) ∞ 2.350
13 -65.9523 1.300 1.80100 34.92
14 18.5797 4.700 1.90366 31.27
15 51.6074 0.919
16 45.9293 2.500 1.94595 17.98
17 120.0000 Variable
18 47.5350 7.100 1.48749 70.31
19 -24.2409 1.300 1.69895 30.13
20 -74.7188 Variable
21 113.0000 4.200 1.58913 61.15
* 22 -108.0000 Variable
* 23 -30.5616 1.500 1.58913 61.15
24 -81.9388 BF
I ∞
[Aspherical data]
m: 2
κ = 0.0000
A4 = 2.97162E-06
A6 = 1.62510E-09
A8 = 2.42658E-13
A10 = 4.56491E-16
A12 = 8.02650E-19
m: 22
κ = 1.0000
A4 = 8.43912E-06
A6 = 6.68890E-10
A8 = 1.69267E-11
A10 = -5.36609E-14
m: 23
κ = 1.0000
A4 = 8.13845E-06
A6 = -4.05875E-09
A8 = 1.66491E-11
A10 = -5.84964E-14
[Various data]
Law of multiple proportions 2.99
WMT
f 22.7 50.0 67.9
FNO 2.92 2.92 2.92
2ω 91.10 45.68 33.64
Ymax 19.32 21.60 21.60
TL 188.45 157.95 163.95
BF 11.75 20.19 25.26
W M T W M T
f, β 22.700 50.000 67.900 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 641.690 1469.10 2002.79
d5 63.985 10.998 3.100 63.985 10.998 3.100
d8 1.000 1.763 1.000 1.000 1.763 1.000
d11 1.900 12.973 26.707 1.900 12.973 26.707
d17 20.431 12.752 12.052 20.013 11.839 10.654
d20 8.701 16.480 16.780 8.112 16.125 16.831
d22 7.699 9.815 6.069 8.705 11.084 7.415
[Lens group data]
Group ST f
1 1 -46.132
2 6 102.733
3 9 64.434
4 12 -89.031
5 18 92.237
6 21 94.399
7 23 -83.639
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 1.038
(2) BFw / fw = 0.518
(3) (-fFN) / | fF | = 0.563
(4) nP / nN = 0.876
(5) | fF1 | / | f1 | = 1.999
(6) | fF2 | / | f1 | = 2.046
(7) | fF1 | / ft = 1.358
(8) | fF2 | / ft = 1.390
(9) | βWF1 | / | βWF2 | = 0.719
(10) | βRw | / | βRt | = 1.616
(11) ωw = 45.55 °
図2A、図2B、および図2Cはそれぞれ、第1実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図3A、図3B、および図3Cはそれぞれ、第1実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。2A, 2B, and 2C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first embodiment, respectively.
3A, 3B, and 3C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first embodiment, respectively.
図2、図3の各収差図において、FNOはFナンバー、NAは開口数、Yは像高をそれぞれ示す。なお、球面収差図では最大口径に対応するFナンバーまたは開口数の値を示し、非点収差図及び歪曲収差図では像高の最大値をそれぞれ示し、コマ収差図では各像高の値を示す。dはd線(λ=587.6nm)、gはg線(λ=435.8nm)をそれぞれ示す。非点収差図において、実線はサジタル像面、破線はメリディオナル像面をそれぞれ示す。なお、以下に示す各実施例の収差図においても、本実施例と同様の符号を用いる。 In each aberration diagram of FIGS. 2 and 3, FNO indicates an F number, NA indicates a numerical aperture, and Y indicates an image height. The spherical aberration diagram shows the F number or numerical aperture value corresponding to the maximum aperture, the astigmatism diagram and the distortion diagram show the maximum image height, and the coma aberration diagram shows the value of each image height. .. d represents the d line (λ = 587.6 nm), and g represents the g line (λ = 435.8 nm). In the astigmatism diagram, the solid line shows the sagittal image plane and the broken line shows the meridional image plane. In the aberration diagram of each example shown below, the same reference numerals as those of this example are used.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and even during short-distance focusing. It can be seen that it has excellent imaging performance.
(第2実施例)
図4は、第2実施例に係る変倍光学系のレンズ構成を示す図である。
本実施例に係る変倍光学系は、物体側から順に、負屈折力を有する第1レンズ群G1と、正屈折力を有する第2レンズ群G2と、開口絞りSと、負屈折力を有する第3レンズ群G3と、正屈折力を有する第4レンズ群G4と、正屈折力を有する第5レンズ群G5と、負屈折力を有する第6レンズ群G6とから構成されている。(Second Example)
FIG. 4 is a diagram showing a lens configuration of the variable magnification optical system according to the second embodiment.
The variable magnification optical system according to the present embodiment has a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, an aperture aperture S, and a negative refractive power in order from the object side. It is composed of a third lens group G3, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a positive refractive power, and a sixth lens group G6 having a negative refractive power.
第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と、物体側に凸面を向けた負メニスカスレンズL12と物体側に凸面を向けた正メニスカスレンズL13との接合負レンズとからなる。
第2レンズ群G2は、物体側から順に、両凸形状の正レンズL21と物体側に凹面を向けた負メニスカスレンズL22との接合正レンズと、物体側に凸面を向けた負メニスカスレンズL23と両凸形状の正レンズL24との接合正レンズとからなる。The first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side. It consists of a bonded negative lens.
The second lens group G2 includes a positive meniscus lens L21 having a biconvex shape, a negative meniscus lens L22 having a concave surface facing the object side, and a negative meniscus lens L23 having a convex surface facing the object side, in order from the object side. It is composed of a bonded positive lens with a biconvex positive lens L24.
第3レンズ群G3は、物体側から順に、両凹形状の負レンズL31と、両凹形状の負レンズL32と両凸形状の正レンズL33との接合正レンズとからなる。
第4レンズ群G4は、両凸形状の正レンズL41と物体側に凹面を向けた負メニスカスレンズL42との接合正レンズからなる。
第5レンズ群G5は、両凸形状の正レンズL51からなる。
第6レンズ群G6は、物体側に凹面を向けた負メニスカスレンズL61からなる。The third lens group G3 is composed of a biconcave negative lens L31, a biconcave negative lens L32, and a biconvex positive lens L33 in this order from the object side.
The fourth lens group G4 is composed of a biconvex positive lens L41 and a junction positive lens L42 having a negative meniscus lens L42 with a concave surface facing the object side.
The fifth lens group G5 is composed of a biconvex positive lens L51.
The sixth lens group G6 is composed of a negative meniscus lens L61 with a concave surface facing the object side.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、および第5レンズ群G5と第6レンズ群G6との間隔が変化するように、第1レンズ群G1から第6レンズ群G6までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the sixth lens group G6 move along the optical axis so that the distance between the lenses changes.
本実施例に係る光学系では、合焦レンズ群として、第4レンズ群G4を光軸に沿って物体側へ移動させるとともに、第5レンズ群G5を第4レンズ群G4とは異なる軌跡で光軸に沿って物体側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fourth lens group G4 is moved to the object side along the optical axis, and the fifth lens group G5 is lighted with a trajectory different from that of the fourth lens group G4. Focusing from an infinity object to a short-range object is performed by moving it toward the object along the axis.
以下の表2に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 2 below lists the specifications of the variable magnification optical system according to this embodiment.
(表2)第2実施例
[面データ]
m r d nd νd
OP ∞
1 217.2239 2.900 1.74389 49.53
* 2 30.2414 13.112
3 1223.5572 2.100 1.59349 67.00
4 35.8181 6.436 2.00069 25.46
5 72.5839 可変
6 128.9112 7.447 1.81600 46.59
7 -39.6982 1.500 1.85000 27.03
8 -142.9408 1.000
9 40.8283 1.500 1.80518 25.45
10 25.0719 10.948 1.60300 65.44
11 -92.3055 可変
12(S) ∞ 2.486
13 -55.5201 1.300 1.90265 35.72
14 121.6217 1.190
15 -124.4061 1.300 1.67270 32.18
16 22.4038 6.400 1.80809 22.74
17 -97.2368 可変
18 62.1388 6.900 1.48749 70.32
19 -23.2151 1.300 1.78472 25.64
20 -50.9732 可変
21 186.2633 4.200 1.58913 61.15
*22 -79.5614 可変
*23 -33.8149 1.500 1.58913 61.15
24 -131.2649 BF
I ∞
[非球面データ]
m:2
κ = 0.0000
A4 = 3.46899E-06
A6 = 3.81982E-09
A8 = -6.40834E-12
A10 = 1.09738E-14
A12 = -4.82160E-18
m:22
κ = 1.0000
A4 = 6.88818E-06
A6 = -6.09818E-10
A8 = 8.44660E-12
A10 = -2.63571E-14
m:23
κ = 1.0000
A4 = 8.06346E-06
A6 = -8.60497E-09
A8 = 2.28581E-11
A10 = -5.12367E-14
[各種データ]
変倍比 2.99
W M T
f 22.7 50.0 67.9
FNO 2.92 2.92 2.92
2ω 91.24 45.92 33.78
Ymax 19.34 21.60 21.60
TL 188.49 155.49 159.75
BF 16.19 19.69 24.21
W M T W M T
f,β 22.700 50.000 67.900 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 643.745 1470.35 2002.57
d5 63.857 10.035 2.501 63.857 10.035 2.501
d11 2.202 10.972 22.702 2.202 10.972 22.702
d17 19.524 10.852 10.688 19.122 9.959 9.322
d20 8.007 19.445 19.346 7.507 19.082 19.339
d22 5.193 10.974 6.787 6.095 12.231 8.161
[レンズ群データ]
群 ST f
1 1 -42.007
2 6 36.073
3 12 -74.292
4 18 96.221
5 21 95.186
6 23 -77.759
[条件式対応値]
(1) MTF1/MTF2 =0.995
(2) BFw/fw =0.713
(3) (−fFN)/|fF|= 0.583
(4) nP/nN= 0.833
(5) |fF1|/|f1| =2.291
(6) |fF2|/|f1| =2.266
(7) |fF1|/ft = 1.417
(8) |fF2|/ft = 1.402
(9) |βWF1|/|βWF2| = 0.762
(10) |βRw|/|βRt| = 1.663
(11) ωw = 45.62°(Table 2) Second Example [Surface data]
m r d nd ν d
OP ∞
1 217.2239 2.900 1.74389 49.53
* 2 30.2414 13.112
3 1223.5572 2.100 1.59349 67.00
4 35.8181 6.436 2.00069 25.46
5 72.5839 Variable
6 128.9112 7.447 1.81600 46.59
7 -39.6982 1.500 1.85000 27.03
8 -142.9408 1.000
9 40.8283 1.500 1.80518 25.45
10 25.0719 10.948 1.60300 65.44
11 -92.3055 Variable
12 (S) ∞ 2.486
13 -55.5201 1.300 1.90265 35.72
14 121.6217 1.190
15 -124.4061 1.300 1.67270 32.18
16 22.4038 6.400 1.80809 22.74
17 -97.2368 Variable
18 62.1388 6.900 1.48749 70.32
19 -23.2151 1.300 1.78472 25.64
20 -50.9732 variable
21 186.2633 4.200 1.58913 61.15
* 22 -79.5614 Variable
* 23 -33.8149 1.500 1.58913 61.15
24 -131.2649 BF
I ∞
[Aspherical data]
m: 2
κ = 0.0000
A4 = 3.46899E-06
A6 = 3.81982E-09
A8 = -6.40834E-12
A10 = 1.09738E-14
A12 = -4.82160E-18
m: 22
κ = 1.0000
A4 = 6.88818E-06
A6 = -6.09818E-10
A8 = 8.44660E-12
A10 = -2.63571E-14
m: 23
κ = 1.0000
A4 = 8.06346E-06
A6 = -8.60497E-09
A8 = 2.28581E-11
A10 = -5.12367E-14
[Various data]
Law of multiple proportions 2.99
WMT
f 22.7 50.0 67.9
FNO 2.92 2.92 2.92
2ω 91.24 45.92 33.78
Ymax 19.34 21.60 21.60
TL 188.49 155.49 159.75
BF 16.19 19.69 24.21
W M T W M T
f, β 22.700 50.000 67.900 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 643.745 1470.35 2002.57
d5 63.857 10.035 2.501 63.857 10.035 2.501
d11 2.202 10.972 22.702 2.202 10.972 22.702
d17 19.524 10.852 10.688 19.122 9.959 9.322
d20 8.007 19.445 19.346 7.507 19.082 19.339
d22 5.193 10.974 6.787 6.095 12.231 8.161
[Lens group data]
Group ST f
1 1 -42.007
2 6 36.073
3 12 -74.292
4 18 96.221
5 21 95.186
6 23 -77.759
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 0.995
(2) BFw / fw = 0.713
(3) (-fFN) / | fF | = 0.583
(4) nP / nN = 0.833
(5) | fF1 | / | f1 | = 2.291
(6) | fF2 | / | f1 | = 2.266
(7) | fF1 | / ft = 1.417
(8) | fF2 | / ft = 1.402
(9) | βWF1 | / | βWF2 | = 0.762
(10) | βRw | / | βRt | = 1.663
(11) ωw = 45.62 °
図5A、図5B、及び図5Cはそれぞれ、第2実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図6A、図6B、及び図6Cはそれぞれ、第2実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。5A, 5B, and 5C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the second embodiment, respectively.
6A, 6B, and 6C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the second embodiment, respectively.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離物体合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, when a short-distance object is in focus. It can be seen that also has excellent imaging performance.
(第3実施例)
図7は、第3実施例に係る変倍光学系のレンズ構成を示す図である。
本実施例に係る変倍光学系は、物体側から順に、負屈折力を有する第1レンズ群G1と、正屈折力を有する第2レンズ群G2と、正屈折力を有する第3レンズ群G3と、開口絞りSと、負屈折力を有する第4レンズ群G4と、正屈折力を有する第5レンズ群G5と、正屈折力を有する第6レンズ群G6と、負屈折力を有する第7レンズ群G7とから構成されている。(Third Example)
FIG. 7 is a diagram showing a lens configuration of the variable magnification optical system according to the third embodiment.
In the variable magnification optical system according to the present embodiment, the first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side. The aperture aperture S, the fourth lens group G4 having a negative refractive power, the fifth lens group G5 having a positive refractive power, the sixth lens group G6 having a positive refractive power, and the seventh lens group having a negative refractive power. It is composed of a lens group G7.
第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と、物体側に凸面を向けた負メニスカスレンズL12と物体側に凸面を向けた正メニスカスレンズL13との接合負レンズとからなる。
第2レンズ群G2は、両凸形状の正レンズL21と物体側に凹面を向けた負メニスカスレンズL22との接合正レンズからなる。
第3レンズ群G3は、物体側に凸面を向けた負メニスカスレンズL31と両凸形状の正レンズL32との接合正レンズからなる。The first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side. It consists of a bonded negative lens.
The second lens group G2 is composed of a biconvex positive lens L21 and a junction positive lens L22 having a negative meniscus lens L22 with a concave surface facing the object side.
The third lens group G3 is composed of a junction positive lens of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32.
第4レンズ群G4は、両凹形状の負レンズL41と物体側に凸面を向けた正メニスカスレンズL42との接合負レンズからなる。
第5レンズ群G5は、両凸形状の正レンズL51と物体側に凹面を向けた負メニスカスレンズL52との接合正レンズからなる。
第6レンズ群G6は、両凸形状の正レンズL61からなる。
第7レンズ群G7は、物体側に凹面を向けた負メニスカスレンズL71からなる。The fourth lens group G4 is composed of a junction negative lens L41 having a biconcave shape and a positive meniscus lens L42 having a convex surface facing the object side.
The fifth lens group G5 is composed of a biconvex positive lens L51 and a negative meniscus lens L52 with a concave surface facing the object side.
The sixth lens group G6 is composed of a biconvex positive lens L61.
The seventh lens group G7 is composed of a negative meniscus lens L71 with a concave surface facing the object side.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、第5レンズ群G5と第6レンズ群G6との間隔、および第6レンズ群G6と第7レンズ群G7との間隔が変化するように、第1レンズ群G1から第7レンズ群G7までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the seventh lens group G7 move along the optical axis so that the distance and the distance between the sixth lens group G6 and the seventh lens group G7 change.
本実施例に係る光学系では、合焦レンズ群として、第5レンズ群G5を光軸に沿って物体側へ移動させるとともに、第6レンズ群G6を第5レンズ群G5とは異なる軌跡で光軸に沿って物体側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fifth lens group G5 is moved to the object side along the optical axis, and the sixth lens group G6 is lighted with a trajectory different from that of the fifth lens group G5. Focusing from an infinity object to a short-range object is performed by moving it toward the object along the axis.
以下の表3に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 3 below lists the specifications of the variable magnification optical system according to this embodiment.
(表3)第3実施例
[面データ]
m r d nd νd
OP ∞
1 259.2015 2.900 1.74389 49.53
* 2 30.9799 13.410
3 1201.6909 2.100 1.59349 66.99
4 36.4155 6.936 2.00100 29.14
5 81.5436 可変
6 124.3745 6.555 1.80400 46.60
7 -55.7538 1.500 1.72825 28.38
8 -633.0468 可変
9 44.9659 1.500 1.85000 27.03
10 27.3358 10.990 1.59319 67.90
11 -89.5168 可変
12(S) ∞ 2.562
13 -58.2664 1.300 1.68893 31.16
14 20.8969 4.742 1.80809 22.74
15 201.5296 可変
16 52.2605 6.900 1.48749 70.31
17 -26.1209 1.300 1.69895 30.13
18 -72.7540 可変
19 130.0000 4.200 1.58913 61.15
*20 -100.4826 可変
*21 -44.3630 1.500 1.58913 61.15
22 -412.9422 BF
I ∞
[非球面データ]
m:2
κ = 0.0000
A4 = 3.40299E-06
A6 = 1.78453E-09
A8 = -2.01869E-13
A10 = 1.07948E-15
A12 = 2.74510E-19
m:20
κ = 1.0000
A4 = 8.80591E-06
A6 = -1.07404E-09
A8 = 1.74456E-11
A10 = -2.66494E-14
m:21
κ = 1.0000
A4 = 6.66893E-06
A6 = -5.20154E-09
A8 = 5.00802E-12
A10 = -7.75803E-15
[各種データ]
変倍比 2.99
W M T
f 22.7 50.0 67.9
FNO 2.92 2.92 2.92
2ω 91.30 45.88 33.64
Ymax 19.36 21.60 21.60
TL 188.49 156.49 165.34
BF 14.19 20.41 24.73
W M T W M T
f,β 22.700 50.000 67.900 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 643.522 1473.82 2010.17
d5 64.909 10.197 2.263 64.909 10.197 2.263
d8 1.000 1.000 1.000 1.000 1.000 1.000
d11 2.200 12.573 28.831 2.200 12.573 28.831
d15 22.896 13.304 11.893 22.388 12.281 10.318
d18 8.047 19.430 19.884 7.707 19.294 20.259
d20 6.853 11.181 8.344 7.701 12.340 9.543
[レンズ群データ]
群 ST f
1 1 -45.334
2 6 112.275
3 9 63.547
4 12 -98.234
5 16 92.914
6 19 96.856
7 21 -84.494
[条件式対応値]
(1) MTF1/MTF2 =1.313
(2) BFw/fw =0.625
(3) (−fFN)/|fF|= 0.635
(4) nP/nN= 0.876
(5) |fF1|/|f1| =2.050
(6) |fF2|/|f1| =2.137
(7) |fF1|/ft = 1.368
(8) |fF2|/ft = 1.426
(9) |βWF1|/|βWF2| = 0.723
(10) |βRw|/|βRt| = 2.084
(11) ωw = 45.65°(Table 3) Third Example [Surface data]
m r d nd ν d
OP ∞
1 259.2015 2.900 1.74389 49.53
* 2 30.9799 13.410
3 1201.6909 2.100 1.59349 66.99
4 36.4155 6.936 2.00100 29.14
5 81.5436 Variable
6 124.3745 6.555 1.80400 46.60
7 -55.7538 1.500 1.72825 28.38
8-633.0468 Variable
9 44.9659 1.500 1.85000 27.03
10 27.3358 10.990 1.59319 67.90
11 -89.5168 Variable
12 (S) ∞ 2.562
13 -58.2664 1.300 1.68893 31.16
14 20.8969 4.742 1.80809 22.74
15 201.5296 Variable
16 52.2605 6.900 1.48749 70.31
17 -26.1209 1.300 1.69895 30.13
18 -72.7540 Variable
19 130.0000 4.200 1.58913 61.15
* 20 -100.4826 Variable
* 21 -44.3630 1.500 1.58913 61.15
22 -412.9422 BF
I ∞
[Aspherical data]
m: 2
κ = 0.0000
A4 = 3.40299E-06
A6 = 1.78453E-09
A8 = -2.01869E-13
A10 = 1.07948E-15
A12 = 2.74510E-19
m: 20
κ = 1.0000
A4 = 8.80591E-06
A6 = -1.07404E-09
A8 = 1.74456E-11
A10 = -2.66494E-14
m: 21
κ = 1.0000
A4 = 6.66893E-06
A6 = -5.20154E-09
A8 = 5.00802E-12
A10 = -7.75803E-15
[Various data]
Law of multiple proportions 2.99
WMT
f 22.7 50.0 67.9
FNO 2.92 2.92 2.92
2ω 91.30 45.88 33.64
Ymax 19.36 21.60 21.60
TL 188.49 156.49 165.34
BF 14.19 20.41 24.73
W M T W M T
f, β 22.700 50.000 67.900 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 643.522 1473.82 2010.17
d5 64.909 10.197 2.263 64.909 10.197 2.263
d8 1.000 1.000 1.000 1.000 1.000 1.000
d11 2.200 12.573 28.831 2.200 12.573 28.831
d15 22.896 13.304 11.893 22.388 12.281 10.318
d18 8.047 19.430 19.884 7.707 19.294 20.259
d20 6.853 11.181 8.344 7.701 12.340 9.543
[Lens group data]
Group ST f
1 1 -45.334
2 6 112.275
3 9 63.547
4 12 -98.234
5 16 92.914
6 19 96.856
7 21 -84.494
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 1.313
(2) BFw / fw = 0.625
(3) (-fFN) / | fF | = 0.635
(4) nP / nN = 0.876
(5) | fF1 | / | f1 | = 2.050
(6) | fF2 | / | f1 | = 2.137
(7) | fF1 | / ft = 1.368
(8) | fF2 | / ft = 1.426
(9) | βWF1 | / | βWF2 | = 0.723
(10) | βRw | / | βRt | = 2.084
(11) ωw = 45.65 °
図8A、図8B、及び図8Cはそれぞれ、第3実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図9A、図9B、及び図9Cはそれぞれ、第3実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。8A, 8B, and 8C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third embodiment, respectively.
9A, 9B, and 9C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third embodiment, respectively.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離物体合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, when a short-distance object is in focus. It can be seen that also has excellent imaging performance.
(第4実施例)
図10は、第4実施例に係る変倍光学系のレンズ構成を示す図である。
本実施例に係る変倍光学系は、物体側から順に、正屈折力を有する第1レンズ群G1と、負屈折力を有する第2レンズ群G2と、開口絞りSと、正屈折力を有する第3レンズ群G3と、正屈折力を有する第4レンズ群G4と、正屈折力を有する第5レンズ群G5と、負屈折力を有する第6レンズ群G6とから構成されている。(Fourth Example)
FIG. 10 is a diagram showing a lens configuration of the variable magnification optical system according to the fourth embodiment.
The variable magnification optical system according to the present embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture aperture S, and a positive refractive power in order from the object side. It is composed of a third lens group G3, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a positive refractive power, and a sixth lens group G6 having a negative refractive power.
第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と物体側に凸面を向けた正メニスカスレンズL12との接合負レンズと、物体側に凸面を向けた正メニスカスレンズL13とからなる。
第2レンズ群G2は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL21と、両凹形状の負レンズL22と、両凸形状の正レンズL23と、両凹形状の負レンズL24と両凸形状の正レンズL25との接合負レンズとからなる。The first lens group G1 is a joint negative lens of a negative meniscus lens L11 having a convex surface facing the object side and a positive meniscus lens L12 having a convex surface facing the object side, and a positive lens having a convex surface facing the object side in order from the object side. It consists of a meniscus lens L13.
The second lens group G2 includes a negative meniscus lens L21 having a convex surface facing the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a biconcave negative lens L24 in order from the object side. And a junction negative lens with a biconvex positive lens L25.
第3レンズ群G3は、物体側から順に、両凸形状の正レンズL31と、物体側に凹面を向けた負メニスカスレンズL32と、両凸形状の正レンズL33と、両凹形状の負レンズL34とからなる。
第4レンズ群G4は、両凸形状の正レンズL41と物体側に凹面を向けた負メニスカスレンズL42との接合正レンズからなる。
第5レンズ群G5は、両凸形状の正レンズL51からなる。
第6レンズ群G6は、物体側から順に、両凹形状の負レンズL61と、物体側に凸面を向けた正メニスカスレンズL62とからなる。The third lens group G3 includes a biconvex positive lens L31, a negative meniscus lens L32 with a concave surface facing the object side, a biconvex positive lens L33, and a biconcave negative lens L34 in order from the object side. It consists of.
The fourth lens group G4 is composed of a biconvex positive lens L41 and a junction positive lens L42 having a negative meniscus lens L42 with a concave surface facing the object side.
The fifth lens group G5 is composed of a biconvex positive lens L51.
The sixth lens group G6 is composed of a negative lens L61 having a concave shape and a positive meniscus lens L62 having a convex surface facing the object side in order from the object side.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、および第5レンズ群G5と第6レンズ群G6との間隔が変化するように、第1レンズ群G1から第6レンズ群G6までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the sixth lens group G6 move along the optical axis so that the distance between the lenses changes.
本実施例に係る光学系では、合焦レンズ群として、第4レンズ群G4を光軸に沿って像側へ移動させるとともに、第5レンズ群G5を光軸に沿って物体側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fourth lens group G4 is moved to the image side along the optical axis, and the fifth lens group G5 is moved to the object side along the optical axis. Focuses on a short-range object from an infinity object.
以下の表4に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 4 below lists the specifications of the variable magnification optical system according to this embodiment.
(表4)第4実施例
[面データ]
m r d nd νd
OP ∞
1 1059.3029 1.000 1.84666 23.80
2 88.2318 6.929 1.90265 35.72
3 403.3118 0.200
4 87.3429 6.677 1.81600 46.59
5 899.1448 可変
* 6 145.1405 1.000 1.81600 46.59
7 21.3498 7.013
8 -93.6905 1.000 1.77250 49.62
9 52.8889 0.200
10 40.8152 5.067 1.80518 25.45
11 -74.9610 1.472
12 -36.2791 1.000 1.80400 46.60
13 404.7262 2.056 2.00069 25.46
14 -319.9567 可変
15(S) ∞ 0.200
16 88.2548 3.685 1.80400 46.60
17 -54.7142 1.284
18 -30.7175 1.000 1.68893 31.16
19 -74.0526 0.200
20 56.5407 4.903 1.71999 50.27
21 -44.3610 4.918
22 -36.9664 1.000 1.72342 38.03
23 80.5817 可変
24 573.8232 6.525 1.59349 67.00
25 -22.0116 1.000 1.71736 29.57
26 -42.4849 可変
27 50.5370 6.205 1.55332 71.68
*28 -153.3313 可変
*29 -95.1749 3.228 1.59551 39.21
30 84.3183 7.544
31 40.5660 7.785 1.59551 39.21
32 180.7170 BF
I ∞
[非球面データ]
m:6
κ = 1.0000
A4 = 1.07708E-06
A6 = -2.41884E-09
A8 = 5.80958E-12
A10 = -5.58700E-15
m:28
κ = 1.0000
A4 = 2.10709E-06
A6 = 4.40633E-09
A8 = -1.52762E-11
A10 = 2.31569E-14
m:29
κ = 1.0000
A4 = -6.15448E-06
A6 = 7.32819E-09
A8 = -2.45254E-11
A10 = 3.72863E-14
[各種データ]
変倍比 2.99
W M T
f 22.7 50.3 67.9
FNO 2.92 2.92 2.92
2ω 91.78 46.78 34.60
Ymax 19.23 21.60 21.60
TL 155.45 174.13 187.93
BF 13.25 21.65 20.92
W M T W M T
f,β 22.700 50.288 67.900 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 638.473 1426.83 1927.07
d5 2.000 25.012 34.560 2.000 25.012 34.560
d14 29.544 7.040 2.000 29.544 7.040 2.000
d23 6.941 4.850 4.000 8.321 5.940 5.254
d26 12.867 12.278 14.712 10.219 9.978 12.178
d28 7.757 20.212 28.652 9.025 21.422 29.932
[レンズ群データ]
群 ST f
1 1 131.146
2 6 -21.329
3 15 56.760
4 24 81.373
5 27 69.446
6 29 -1467.881
[条件式対応値]
(1) MTF1/MTF2 =0.980
(2) BFw/fw =0.584
(3) (−fFN)/|fF|= 0.936
(4) nP/nN= 0.928
(5) |fF1|/|f1| =0.620
(6) |fF2|/|f1| =0.530
(7) |fF1|/ft = 1.198
(8) |fF2|/ft = 1.023
(9) |βWF1|/|βWF2| = 0.014
(10) |βRw|/|βRt| = 0.005
(11) ωw = 45.89°(Table 4) Fourth Example [Surface data]
m r d nd ν d
OP ∞
1 1059.3029 1.000 1.84666 23.80
2 88.2318 6.929 1.90265 35.72
3 403.3118 0.200
4 87.3429 6.677 1.81600 46.59
5 899.1448 Variable
* 6 145.1405 1.000 1.81600 46.59
7 21.3498 7.013
8 -93.6905 1.000 1.77250 49.62
9 52.8889 0.200
10 40.8152 5.067 1.80518 25.45
11 -74.9610 1.472
12 -36.2791 1.000 1.80400 46.60
13 404.7262 2.056 2.00069 25.46
14 -319.9567 Variable
15 (S) ∞ 0.200
16 88.2548 3.685 1.80400 46.60
17 -54.7142 1.284
18 -30.7175 1.000 1.68893 31.16
19 -74.0526 0.200
20 56.5407 4.903 1.71999 50.27
21 -44.3610 4.918
22 -36.9664 1.000 1.72342 38.03
23 80.5817 Variable
24 573.8232 6.525 1.59349 67.00
25 -22.0116 1.000 1.71736 29.57
26 -42.4849 Variable
27 50.5370 6.205 1.55332 71.68
* 28 -153.3313 Variable
* 29 -95.1749 3.228 1.59551 39.21
30 84.3183 7.544
31 40.5660 7.785 1.59551 39.21
32 180.7170 BF
I ∞
[Aspherical data]
m: 6
κ = 1.0000
A4 = 1.07708E-06
A6 = -2.41884E-09
A8 = 5.80958E-12
A10 = -5.58700E-15
m: 28
κ = 1.0000
A4 = 2.10709E-06
A6 = 4.40633E-09
A8 = -1.52762E-11
A10 = 2.31569E-14
m: 29
κ = 1.0000
A4 = -6.15448E-06
A6 = 7.32819E-09
A8 = -2.45254E-11
A10 = 3.72863E-14
[Various data]
Law of multiple proportions 2.99
WMT
f 22.7 50.3 67.9
FNO 2.92 2.92 2.92
2ω 91.78 46.78 34.60
Ymax 19.23 21.60 21.60
TL 155.45 174.13 187.93
BF 13.25 21.65 20.92
W M T W M T
f, β 22.700 50.288 67.900 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 638.473 1426.83 1927.07
d5 2.000 25.012 34.560 2.000 25.012 34.560
d14 29.544 7.040 2.000 29.544 7.040 2.000
d23 6.941 4.850 4.000 8.321 5.940 5.254
d26 12.867 12.278 14.712 10.219 9.978 12.178
d28 7.757 20.212 28.652 9.025 21.422 29.932
[Lens group data]
Group ST f
1 1 131.146
2 6 -21.329
3 15 56.760
4 24 81.373
5 27 69.446
6 29 -1467.881
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 0.980
(2) BFw / fw = 0.584
(3) (-fFN) / | fF | = 0.936
(4) nP / nN = 0.928
(5) | fF1 | / | f1 | = 0.620
(6) | fF2 | / | f1 | = 0.530
(7) | fF1 | / ft = 1.198
(8) | fF2 | / ft = 1.023
(9) | βWF1 | / | βWF2 | = 0.014
(10) | βRw | / | βRt | = 0.005
(11) ωw = 45.89 °
図11A、図11B、及び図11Cはそれぞれ、第4実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図12A、図12B、及び図12Cはそれぞれ、第4実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。11A, 11B, and 11C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fourth embodiment, respectively.
12A, 12B, and 12C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fourth embodiment, respectively.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離物体合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, when a short-distance object is in focus. It can be seen that also has excellent imaging performance.
(第5実施例)
図13は、第5実施例に係る変倍光学系のレンズ構成を示す図である。
本実施例に係る変倍光学系は、物体側から順に、正屈折力を有する第1レンズ群G1と、負屈折力を有する第2レンズ群G2と、開口絞りSと、正屈折力を有する第3レンズ群G3と、負屈折力を有する第4レンズ群G4と、正屈折力を有する第5レンズ群G5と、負屈折力を有する第6レンズ群G6とから構成されている。(Fifth Example)
FIG. 13 is a diagram showing a lens configuration of the variable magnification optical system according to the fifth embodiment.
The variable magnification optical system according to the present embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture aperture S, and a positive refractive power in order from the object side. It is composed of a third lens group G3, a fourth lens group G4 having a negative refractive power, a fifth lens group G5 having a positive refractive power, and a sixth lens group G6 having a negative refractive power.
第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と両凸形状の正レンズL12との接合正レンズと、物体側に凸面を向けた正メニスカスレンズL13とからなる。
第2レンズ群G2は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL21と、物体側に凹面を向けた負メニスカスレンズL22と、物体側に凹面を向けた正メニスカスレンズL23と、物体側に凹面を向けた負メニスカスレンズL24とからなる。The first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side and a positive meniscus lens L12 having a biconvex shape, and a positive meniscus lens L13 having a convex surface facing the object side, in order from the object side. Consists of.
The second lens group G2 includes a negative meniscus lens L21 having a convex surface facing the object side, a negative meniscus lens L22 having a concave surface facing the object side, and a positive meniscus lens L23 having a concave surface facing the object side in order from the object side. It consists of a negative meniscus lens L24 with a concave surface facing the object side.
第3レンズ群G3は、物体側から順に、物体側に凸面を向けた正レメニスカスレンズL31と、両凸形状の正レンズL32と、両凸形状の正レンズL33と物体側に凹面を向けた負メニスカスレンズL34との接合正レンズとからなる。
第4レンズ群G4は、物体側から順に、両凹形状の負レンズL41と、両凸形状の正レンズL42とからなる。
第5レンズ群G5は、両凸形状の正レンズL51からなる。
第6レンズ群G6は、物体側から順に、両凹形状の負レンズL61と、物体側に凸面を向けた正メニスカスレンズL62とからなる。The third lens group G3 has a positive remeniscus lens L31 with a convex surface facing the object side, a biconvex positive lens L32, a biconvex positive lens L33, and a concave surface facing the object side in order from the object side. It consists of a positive junction lens with a negative meniscus lens L34.
The fourth lens group G4 is composed of a biconcave negative lens L41 and a biconvex positive lens L42 in order from the object side.
The fifth lens group G5 is composed of a biconvex positive lens L51.
The sixth lens group G6 is composed of a negative lens L61 having a concave shape and a positive meniscus lens L62 having a convex surface facing the object side in order from the object side.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、および第5レンズ群G5と第6レンズ群G6との間隔が変化するように、第1レンズ群G1から第6レンズ群G6までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the sixth lens group G6 move along the optical axis so that the distance between the lenses changes.
本実施例に係る光学系では、合焦レンズ群として、第4レンズ群G4を光軸に沿って物体側へ移動させるとともに、第5レンズ群G5を第4レンズ群G4とは異なる軌跡で光軸に沿って物体側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fourth lens group G4 is moved to the object side along the optical axis, and the fifth lens group G5 is lighted with a trajectory different from that of the fourth lens group G4. Focusing from an infinity object to a short-range object is performed by moving it toward the object along the axis.
以下の表5に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 5 below lists the specifications of the variable magnification optical system according to this embodiment.
(表5)第5実施例
[面データ]
m r d nd νd
OP ∞
1 3049.4158 2.000 1.84666 23.80
2 109.9340 7.861 1.81600 46.59
3 -1409.8119 0.200
4 101.3915 6.059 1.81600 46.59
5 503.4410 可変
* 6 239.3378 1.300 1.81600 46.59
7 22.0458 9.224
8 -40.1436 1.300 1.77250 49.62
9 -121.4951 0.200
10 -196.1454 4.421 1.95000 29.37
11 -34.6549 1.015
12 -29.7495 1.300 1.59349 67.00
13 -185.4662 可変
14(S) ∞ 0.200
15 47.0680 3.025 1.88300 40.66
16 271.9137 10.130
17 176.7677 2.592 1.59319 67.90
18 -179.0400 0.200
19 86.4232 5.895 1.59319 67.90
20 -27.4209 1.000 1.95000 29.37
21 -41.6214 可変
22 -33.9616 1.000 1.72825 28.38
23 151.3178 0.200
24 84.0645 3.506 1.71999 50.27
25 -174.4171 可変
26 140.7071 4.753 1.54814 45.78
*27 -72.5378 可変
*28 -60.3860 1.300 1.74950 35.25
29 326.8097 1.986
30 45.0000 7.770 1.64000 60.19
31 459.8861 BF
I ∞
[非球面データ]
m:6
κ = 1.0000
A4 = 8.90328E-07
A6 = -2.96841E-09
A8 = 5.16084E-12
A10 = -3.05458E-15
m:27
κ = 1.0000
A4 = 2.61448E-06
A6 = 8.65353E-09
A8 = -3.00982E-11
A10 = 4.50822E-14
m:28
κ = 1.0000
A4 = -6.11667E-06
A6 = 9.18242E-09
A8 = -3.76607E-11
A10 = 4.75789E-14
[各種データ]
変倍比 2.99
W M T
f 22.7 49.7 67.9
FNO 2.92 2.92 2.92
2ω 91.48 45.84 32.90
Ymax 19.18 21.60 21.60
TL 157.45 170.49 182.85
BF 14.08 21.92 17.11
W M T W M T
f,β 22.701 49.700 67.907 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 640.708 1420.26 1939.82
d5 2.000 24.596 37.406 2.000 24.596 37.406
d13 35.154 8.040 2.000 35.154 8.040 2.000
d21 4.461 8.442 11.773 4.175 8.108 11.453
d25 20.335 18.256 18.682 18.556 15.932 15.718
d27 2.986 10.795 17.440 5.050 13.453 20.723
[レンズ群データ]
群 ST f
1 1 141.872
2 6 -24.424
3 14 30.546
4 22 -75.468
5 26 88.014
6 28 -713.321
[条件式対応値]
(1) MTF1/MTF2 =0.098
(2) BFw/fw =0.620
(3) (−fFN)/|fF|= 0.504
(4) nP/nN= 0.995
(5) |fF1|/|f1| =0.532
(6) |fF2|/|f1| =0.620
(7) |fF1|/ft = 1.111
(8) |fF2|/ft = 1.296
(9) |βWF1|/|βWF2| = 2.449
(10) |βRw|/|βRt| = 1.034
(11) ωw = 45.74°(Table 5) Fifth Example [Surface data]
m r d nd ν d
OP ∞
1 3049.4158 2.000 1.84666 23.80
2 109.9340 7.861 1.81600 46.59
3-1409.8119 0.200
4 101.3915 6.059 1.81600 46.59
5 503.4410 Variable
* 6 239.3378 1.300 1.81600 46.59
7 22.0458 9.224
8 -40.1436 1.300 1.77250 49.62
9 -121.4951 0.200
10 -196.1454 4.421 1.95000 29.37
11 -34.6549 1.015
12 -29.7495 1.300 1.59349 67.00
13 -185.4662 Variable
14 (S) ∞ 0.200
15 47.0680 3.025 1.88300 40.66
16 271.9137 10.130
17 176.7677 2.592 1.59319 67.90
18 -179.0400 0.200
19 86.4232 5.895 1.59319 67.90
20 -27.4209 1.000 1.95000 29.37
21 -41.6214 Variable
22 -33.9616 1.000 1.72825 28.38
23 151.3178 0.200
24 84.0645 3.506 1.71999 50.27
25 -174.4171 variable
26 140.7071 4.753 1.54814 45.78
* 27 -72.5378 Variable
* 28 -60.3860 1.300 1.74950 35.25
29 326.8097 1.986
30 45.0000 7.770 1.64000 60.19
31 459.8861 BF
I ∞
[Aspherical data]
m: 6
κ = 1.0000
A4 = 8.90328E-07
A6 = -2.96841E-09
A8 = 5.16084E-12
A10 = -3.05458E-15
m: 27
κ = 1.0000
A4 = 2.61448E-06
A6 = 8.65353E-09
A8 = -3.00982E-11
A10 = 4.50822E-14
m: 28
κ = 1.0000
A4 = -6.11667E-06
A6 = 9.18242E-09
A8 = -3.76607E-11
A10 = 4.75789E-14
[Various data]
Law of multiple proportions 2.99
WMT
f 22.7 49.7 67.9
FNO 2.92 2.92 2.92
2ω 91.48 45.84 32.90
Ymax 19.18 21.60 21.60
TL 157.45 170.49 182.85
BF 14.08 21.92 17.11
W M T W M T
f, β 22.701 49.700 67.907 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 640.708 1420.26 1939.82
d5 2.000 24.596 37.406 2.000 24.596 37.406
d13 35.154 8.040 2.000 35.154 8.040 2.000
d21 4.461 8.442 11.773 4.175 8.108 11.453
d25 20.335 18.256 18.682 18.556 15.932 15.718
d27 2.986 10.795 17.440 5.050 13.453 20.723
[Lens group data]
Group ST f
1 1 141.872
2 6 -24.424
3 14 30.546
4 22 -75.468
5 26 88.014
6 28 -713.321
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 0.098
(2) BFw / fw = 0.620
(3) (-fFN) / | fF | = 0.504
(4) nP / nN = 0.995
(5) | fF1 | / | f1 | = 0.532
(6) | fF2 | / | f1 | = 0.620
(7) | fF1 | / ft = 1.111
(8) | fF2 | / ft = 1.296
(9) | βWF1 | / | βWF2 | = 2.449
(10) | βRw | / | βRt | = 1.034
(11) ωw = 45.74 °
図14A、図14B、及び図14Cはそれぞれ、第5実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図15A、図15B、及び図15Cはそれぞれ、第5実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。14A, 14B, and 14C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth embodiment, respectively.
15A, 15B, and 15C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth embodiment, respectively.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離物体合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, when a short-distance object is in focus. It can be seen that also has excellent imaging performance.
(第6実施例)
図16は、第6実施例に係る変倍光学系のレンズ構成を示す図である。
本実施例に係る変倍光学系は、物体側から順に、正屈折力を有する第1レンズ群G1と、負屈折力を有する第2レンズ群G2と、正屈折力を有する第3レンズ群G3と、開口絞りSと、正屈折力を有する第4レンズ群G4と、負屈折力を有する第5レンズ群G5と、正屈折力を有する第6レンズ群G6と、負屈折力を有する第7レンズ群G7とから構成されている。(6th Example)
FIG. 16 is a diagram showing a lens configuration of the variable magnification optical system according to the sixth embodiment.
In the variable magnification optical system according to the present embodiment, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side. The aperture aperture S, the fourth lens group G4 having a positive refractive power, the fifth lens group G5 having a negative refractive power, the sixth lens group G6 having a positive refractive power, and the seventh lens group having a negative refractive power. It is composed of a lens group G7.
第1レンズ群G1は、物体側から順に、両凸形状の正レンズL11と、物体側に凸面を向けた負メニスカスレンズL12と両凸形状の正レンズL13との接合正レンズとからなる。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と、物体側に凸面を向けた正メニスカスレンズL22と、両凹形状の負レンズL23と物体側に凸面を向けた正メニスカスレンズL24との接合負レンズとからなる。
第3レンズ群G3は、物体側から順に、両凸形状の正レンズL31と、両凸形状の正レンズL32と両凹形状の負レンズL33との接合正レンズとからなる。The first lens group G1 is composed of a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface facing the object side, and a junction positive lens L13 in order from the object side.
In the second lens group G2, in order from the object side, a biconcave negative lens L21, a positive meniscus lens L22 with a convex surface facing the object side, a biconcave negative lens L23, and a positive lens with a convex surface facing the object side. It consists of a junction negative lens with a meniscus lens L24.
The third lens group G3 is composed of a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 in this order from the object side.
第4レンズ群G4は、両凸形状の正レンズL41と物体側に凹面を向けた負メニスカスレンズL42との接合正レンズからなる。
第5レンズ群G5は、物体側に凸面を向けた負メニスカスレンズL51からなる。
第6レンズ群G6は、物体側に凹面を向けた正メニスカスレンズL61からなる。
第7レンズ群G7は、物体側から順に、物体側に凹面を向けた負メニスカスレンズL71と、両凸形状の正レンズL72とからなる。The fourth lens group G4 is composed of a biconvex positive lens L41 and a junction positive lens L42 having a negative meniscus lens L42 with a concave surface facing the object side.
The fifth lens group G5 is composed of a negative meniscus lens L51 with a convex surface facing the object side.
The sixth lens group G6 is composed of a positive meniscus lens L61 with a concave surface facing the object side.
The seventh lens group G7 is composed of a negative meniscus lens L71 having a concave surface facing the object side and a biconvex positive lens L72 in order from the object side.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、第5レンズ群G5と第6レンズ群G6との間隔、および第6レンズ群G6と第7レンズ群G7との間隔が変化するように、第1レンズ群G1から第7レンズ群G7までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the seventh lens group G7 move along the optical axis so that the distance and the distance between the sixth lens group G6 and the seventh lens group G7 change.
本実施例に係る光学系では、合焦レンズ群として、第4レンズ群G4を光軸に沿って物体側へ移動させるとともに、第6レンズ群G6を第4レンズ群G4とは異なる軌跡で光軸に沿って物体側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fourth lens group G4 is moved to the object side along the optical axis, and the sixth lens group G6 is lighted with a trajectory different from that of the fourth lens group G4. Focusing from an infinity object to a short-range object is performed by moving it toward the object along the axis.
以下の表6に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 6 below lists the specifications of the variable magnification optical system according to this embodiment.
(表6)第6実施例
[面データ]
m r d nd νd
OP ∞
1 829.7998 3.542 1.48749 70.32
2 -352.7135 0.200
3 102.3920 1.700 1.67270 32.18
4 65.2892 8.627 1.49700 81.73
5 -4480.3970 可変
6 -331.7733 1.000 1.77250 49.62
7 47.4606 2.120
8 45.4437 2.785 1.80518 25.45
9 90.1171 3.854
10 -70.4901 1.000 1.67003 47.14
11 34.7167 3.536 1.75520 27.57
12 116.6754 可変
13 100.8918 3.650 1.80610 40.97
14 -72.8434 0.200
15 48.3355 4.843 1.49700 81.73
16 -53.3052 1.443 1.85026 32.35
17 226.4472 1.323
18(S) ∞ 可変
19 56.3197 4.471 1.51680 63.88
20 -38.8956 1.000 1.80100 34.92
21 -92.0195 可変
22 513.7755 3.255 1.85026 32.35
23 39.1334 可変
24 -52.5225 4.182 1.71736 29.57
25 -30.1949 可変
26 -25.8031 1.873 1.81600 46.59
27 -90.1071 0.200
28 139.7088 3.802 1.79504 28.69
29 -94.4559 BF
I ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 100.0 292.0
FNO 4.74 4.81 5.88
2ω 34.32 24.20 8.28
Ymax 21.60 21.60 21.60
TL 193.32 211.66 248.32
BF 38.32 39.78 62.52
W M T W M T
f,β 72.100 99.963 292.002 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 2117.00 2908.95 8607.60
d5 2.000 28.621 75.058 2.000 28.621 75.058
d12 43.058 34.009 2.000 43.058 34.009 2.000
d18 21.601 19.944 21.366 21.096 19.010 19.414
d21 2.000 3.657 2.235 2.505 4.591 4.188
d23 11.246 10.437 10.009 10.564 10.137 9.509
d25 16.489 16.614 16.522 17.171 16.914 17.022
[レンズ群データ]
群 ST f
1 1 167.538
2 6 -41.098
3 13 50.455
4 19 95.000
5 22 -49.977
6 24 91.830
7 26 -136.049
[条件式対応値]
(1) MTF1/MTF2 =3.903
(2) BFw/fw =0.531
(3) (−fFN)/|fF|= 0.924
(4) nP/nN= 0.842
(5) |fF1|/|f1| = 0.567
(6) |fF2|/|f1| = 0.548
(7) |fF1|/ft = 0.325
(8) |fF2|/ft = 0.314
(9) |βWF1|/|βWF2| = 1.096
(10) |βRw|/|βRt| = 0.934
(11) ωw = 17.16°(Table 6) 6th Example [Surface data]
m r d nd ν d
OP ∞
1 829.7998 3.542 1.48749 70.32
2-352.7135 0.200
3 102.3920 1.700 1.67270 32.18
4 65.2892 8.627 1.49700 81.73
5 -4480.3970 Variable
6 -331.7733 1.000 1.77250 49.62
7 47.4606 2.120
8 45.4437 2.785 1.80518 25.45
9 90.1171 3.854
10 -70.4901 1.000 1.67003 47.14
11 34.7167 3.536 1.75520 27.57
12 116.6754 Variable
13 100.8918 3.650 1.80610 40.97
14 -72.8434 0.200
15 48.3355 4.843 1.49700 81.73
16 -53.3052 1.443 1.85026 32.35
17 226.4472 1.323
18 (S) ∞ Variable
19 56.3197 4.471 1.51680 63.88
20 -38.8956 1.000 1.80100 34.92
21 -92.0195 Variable
22 513.7755 3.255 1.85026 32.35
23 39.1334 Variable
24 -52.5225 4.182 1.71736 29.57
25 -30.1949 Variable
26 -25.8031 1.873 1.81600 46.59
27 -90.1071 0.200
28 139.7088 3.802 1.79504 28.69
29 -94.4559 BF
I ∞
[Various data]
Variable ratio 4.05
WMT
f 72.1 100.0 292.0
FNO 4.74 4.81 5.88
2ω 34.32 24.20 8.28
Ymax 21.60 21.60 21.60
TL 193.32 211.66 248.32
BF 38.32 39.78 62.52
W M T W M T
f, β 72.100 99.963 292.002 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 2117.00 2908.95 8607.60
d5 2.000 28.621 75.058 2.000 28.621 75.058
d12 43.058 34.009 2.000 43.058 34.009 2.000
d18 21.601 19.944 21.366 21.096 19.010 19.414
d21 2.000 3.657 2.235 2.505 4.591 4.188
d23 11.246 10.437 10.009 10.564 10.137 9.509
d25 16.489 16.614 16.522 17.171 16.914 17.022
[Lens group data]
Group ST f
1 1 167.538
2 6 -41.098
3 13 50.455
4 19 95.000
5 22 -49.977
6 24 91.830
7 26 -136.049
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 3.903
(2) BFw / fw = 0.531
(3) (-fFN) / | fF | = 0.924
(4) nP / nN = 0.842
(5) | fF1 | / | f1 | = 0.567
(6) | fF2 | / | f1 | = 0.548
(7) | fF1 | / ft = 0.325
(8) | fF2 | / ft = 0.314
(9) | βWF1 | / | βWF2 | = 1.096
(10) | βRw | / | βRt | = 0.934
(11) ωw = 17.16 °
図17A、図17B、及び図17Cはそれぞれ、第6実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図18A、図18B、及び図18Cはそれぞれ、第6実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。17A, 17B, and 17C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth embodiment, respectively.
18A, 18B, and 18C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth embodiment, respectively.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離物体合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, when a short-distance object is in focus. It can be seen that also has excellent imaging performance.
(第7実施例)
図19は、第7実施例に係る変倍光学系のレンズ構成を示す図である。
本実施例に係る変倍光学系は、物体側から順に、正屈折力を有する第1レンズ群G1と、負屈折力を有する第2レンズ群G2と、開口絞りSと、正屈折力を有する第3レンズ群G3と、正屈折力を有する第4レンズ群G4と、正屈折力を有する第5レンズ群G5と、負屈折力を有する第6レンズ群G6と、正屈折力を有する第7レンズ群G7とから構成されている。(7th Example)
FIG. 19 is a diagram showing a lens configuration of the variable magnification optical system according to the seventh embodiment.
The variable magnification optical system according to the present embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture aperture S, and a positive refractive power in order from the object side. A third lens group G3, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a positive refractive power, a sixth lens group G6 having a negative refractive power, and a seventh lens group having a positive refractive power. It is composed of a lens group G7.
第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と両凸形状の正レンズL12との接合正レンズと、物体側に凸面を向けた正メニスカスレンズL13とからなる。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と、両凹形状の負レンズL22と、両凸形状の正レンズL23と両凹形状の負レンズL24との接合正レンズとからなる。The first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side and a positive meniscus lens L12 having a biconvex shape, and a positive meniscus lens L13 having a convex surface facing the object side, in order from the object side. Consists of.
The second lens group G2 is a combined positive lens of a biconcave negative lens L21, a biconcave negative lens L22, a biconvex positive lens L23, and a biconcave negative lens L24 in order from the object side. It consists of.
第3レンズ群G3は、物体側から順に、両凸形状の正レンズL31と、両凸形状の正レンズL32と両凹形状の負レンズL33との接合正レンズとからなる。
第4レンズ群G4は、物体側から順に、両凸形状の正レンズL41と、物体側に凹面を向けた負メニスカスレンズL42とからなる。
第5レンズ群G5は、両凸形状の正レンズL51からなる。
第6レンズ群G6は、物体側に凹面を向けた正メニスカスレンズL61と両凹形状の負レンズL62との接合負レンズからなる。
第7レンズ群G7は、物体側に凹面を向けた正メニスカスレンズL71からなる。The third lens group G3 is composed of a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 in this order from the object side.
The fourth lens group G4 is composed of a biconvex positive lens L41 and a negative meniscus lens L42 with a concave surface facing the object side in order from the object side.
The fifth lens group G5 is composed of a biconvex positive lens L51.
The sixth lens group G6 is composed of a positive meniscus lens L61 with a concave surface facing the object side and a junction negative lens L62 having a biconcave shape.
The seventh lens group G7 is composed of a positive meniscus lens L71 with a concave surface facing the object side.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、第5レンズ群G5と第6レンズ群G6との間隔、および第6レンズ群G6と第7レンズ群G7との間隔が変化するように、第1レンズ群G1から第7レンズ群G7までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the seventh lens group G7 move along the optical axis so that the distance and the distance between the sixth lens group G6 and the seventh lens group G7 change.
本実施例に係る光学系では、合焦レンズ群として、第4レンズ群G4を光軸に沿って像側へ移動させるとともに、第5レンズ群G5を光軸に沿って物体側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fourth lens group G4 is moved to the image side along the optical axis, and the fifth lens group G5 is moved to the object side along the optical axis. Focuses on a short-range object from an infinity object.
以下の表7に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 7 below lists the specifications of the variable magnification optical system according to this embodiment.
(表7)第7実施例
[面データ]
m r d nd νd
OP ∞
1 137.2611 2.000 1.85000 27.03
2 66.9538 6.897 1.59319 67.90
3 -677.5498 0.200
4 107.1491 4.136 1.61800 63.34
5 9353.1970 可変
* 6 -150.8738 2.000 1.90265 35.72
7 25.5606 4.779
8 -260.6181 1.000 1.81600 46.59
9 86.2883 0.200
10 41.4737 5.687 1.84666 23.78
11 -48.7116 1.000 1.81600 46.59
12 54.7043 可変
13(S) ∞ 0.200
14 44.1680 2.899 1.77250 49.62
15 -280.6415 0.200
16 27.1646 4.022 1.59319 67.90
17 -146.4206 1.000 1.95000 29.37
18 51.2305 可変
19 50.9241 2.999 1.83481 42.73
20 -182.3279 2.176
21 -80.2256 1.000 1.88300 40.66
22 -715.7217 可変
23 101.2327 2.235 1.83481 42.73
*24 -257.5032 可変
*25 -283.1336 4.085 1.58144 40.98
26 -18.4049 1.000 1.90366 31.27
27 87.0702 可変
28 -136.5964 6.525 1.59319 67.90
29 -38.7359
I ∞
[非球面データ]
m:6
κ = 1.0000
A4 = 1.67289E-07
A6 = -1.03260E-09
A8 = 5.37315E-12
A10 = -4.58982E-15
m:24
κ = 1.0000
A4 = 4.43454E-06
A6 = 2.09008E-08
A8 = -1.49527E-10
A10 = 8.49155E-13
m:25
κ = 1.0000
A4 = -2.21915E-05
A6 = 1.15956E-07
A8 = -1.94063E-09
A10 = 9.93961E-12
[各種データ]
変倍比 8.50
W M T
f 24.7 70.0 210.0
FNO 3.47 5.31 6.52
2ω 85.94 32.52 11.08
Ymax 19.90 21.60 21.60
TL 141.66 173.63 194.45
BF 23.35 32.36 13.26
W M T W M T
f,β 24.700 70.005 209.991 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 706.534 2031.32 6175.90
d5 2.002 22.984 54.077 2.002 22.984 54.077
d12 37.630 16.703 2.000 37.630 16.703 2.000
d18 9.388 7.991 4.000 9.688 8.290 4.039
d22 7.722 6.619 11.160 6.491 5.369 9.139
d24 2.215 7.801 20.136 3.147 8.752 21.938
d27 3.110 22.940 33.576 3.110 22.940 33.576
[レンズ群データ]
群 ST f
1 1 113.050
2 6 -19.624
3 13 42.460
4 19 84.928
5 23 87.292
6 25 -33.119
7 28 88.941
[条件式対応値]
(1) MTF1/MTF2 =0.022
(2) BFw/fw = 0.945
(3) (−fFN)/|fF|= 1.206
(4) nP/nN= 0.974
(5) |fF1|/|f1| = 0.751
(6) |fF2|/|f1| = 0.772
(7) |fF1|/ft = 0.404
(8) |fF2|/ft = 0.416
(9) |βWF1|/|βWF2| = 0.616
(10) |βRw|/|βRt| = 1.858
(11) ωw = 42.97°(Table 7) Seventh Example [Surface data]
m r d nd ν d
OP ∞
1 137.2611 2.000 1.85000 27.03
2 66.9538 6.897 1.59319 67.90
3 -677.5498 0.200
4 107.1491 4.136 1.61800 63.34
5 9353.1970 Variable
* 6 -150.8738 2.000 1.90265 35.72
7 25.5606 4.779
8-260.6181 1.000 1.81600 46.59
9 86.2883 0.200
10 41.4737 5.687 1.84666 23.78
11 -48.7116 1.000 1.81600 46.59
12 54.7043 Variable
13 (S) ∞ 0.200
14 44.1680 2.899 1.77250 49.62
15 -280.6415 0.200
16 27.1646 4.022 1.59319 67.90
17 -146.4206 1.000 1.95000 29.37
18 51.2305 Variable
19 50.9241 2.999 1.83481 42.73
20 -182.3279 2.176
21 -80.2256 1.000 1.88300 40.66
22 -715.7217 Variable
23 101.2327 2.235 1.83481 42.73
* 24-257.5032 Variable
* 25 -283.1336 4.085 1.58144 40.98
26 -18.4049 1.000 1.90366 31.27
27 87.0702 Variable
28 -136.5964 6.525 1.59319 67.90
29 -38.7359
I ∞
[Aspherical data]
m: 6
κ = 1.0000
A4 = 1.67289E-07
A6 = -1.03260E-09
A8 = 5.37315E-12
A10 = -4.58982E-15
m: 24
κ = 1.0000
A4 = 4.43454E-06
A6 = 2.09008E-08
A8 = -1.49527E-10
A10 = 8.49155E-13
m: 25
κ = 1.0000
A4 = -2.21915E-05
A6 = 1.15956E-07
A8 = -1.94063E-09
A10 = 9.93961E-12
[Various data]
Law of multiple proportions 8.50
WMT
f 24.7 70.0 210.0
FNO 3.47 5.31 6.52
2ω 85.94 32.52 11.08
Ymax 19.90 21.60 21.60
TL 141.66 173.63 194.45
BF 23.35 32.36 13.26
W M T W M T
f, β 24.700 70.005 209.991 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 706.534 2031.32 6175.90
d5 2.002 22.984 54.077 2.002 22.984 54.077
d12 37.630 16.703 2.000 37.630 16.703 2.000
d18 9.388 7.991 4.000 9.688 8.290 4.039
d22 7.722 6.619 11.160 6.491 5.369 9.139
d24 2.215 7.801 20.136 3.147 8.752 21.938
d27 3.110 22.940 33.576 3.110 22.940 33.576
[Lens group data]
Group ST f
1 1 113.050
2 6 -19.624
3 13 42.460
4 19 84.928
5 23 87.292
6 25 -33.119
7 28 88.941
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 0.022
(2) BFw / fw = 0.945
(3) (-fFN) / | fF | = 1.206
(4) nP / nN = 0.974
(5) | fF1 | / | f1 | = 0.751
(6) | fF2 | / | f1 | = 0.772
(7) | fF1 | / ft = 0.404
(8) | fF2 | / ft = 0.416
(9) | βWF1 | / | βWF2 | = 0.616
(10) | βRw | / | βRt | = 1.858
(11) ωw = 42.97 °
図20A、図20B、及び図20Cはそれぞれ、第7実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図21A、図21B、及び図21Cはそれぞれ、第7実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。20A, 20B, and 20C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the seventh embodiment, respectively.
21A, 21B, and 21C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the seventh embodiment, respectively.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離物体合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, when a short-distance object is in focus. It can be seen that also has excellent imaging performance.
(第8実施例)
図22は、第8実施例に係る変倍光学系のレンズ構成を示す図である。
本実施例に係る変倍光学系は、物体側から順に、負屈折力を有する第1レンズ群G1と、正屈折力を有する第2レンズ群G2と、開口絞りSと、負屈折力を有する第3レンズ群G3と、正屈折力を有する第4レンズ群G4と、負屈折力を有する第5レンズ群G5と、正屈折力を有する第6レンズ群G6と、負屈折力を有する第7レンズ群G7とから構成されている。(8th Example)
FIG. 22 is a diagram showing a lens configuration of the variable magnification optical system according to the eighth embodiment.
The variable magnification optical system according to the present embodiment has a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, an aperture aperture S, and a negative refractive power in order from the object side. A third lens group G3, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, a sixth lens group G6 having a positive refractive power, and a seventh lens group having a negative refractive power. It is composed of a lens group G7.
第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と、物体側に凸面を向けた負メニスカスレンズL12と物体側に凸面を向けた正メニスカスレンズL13との接合正レンズとからなる。
第2レンズ群G2は、物体側から順に、両凸形状の正レンズL21と物体側に凹面を向けた負メニスカスレンズL22との接合正レンズと、物体側に凸面を向けた負メニスカスレンズL23と両凸形状の正レンズL24との接合正レンズとからなる。The first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side. It consists of a bonded positive lens.
The second lens group G2 includes a positive meniscus lens L21 having a biconvex shape, a negative meniscus lens L22 having a concave surface facing the object side, and a negative meniscus lens L23 having a convex surface facing the object side, in order from the object side. It is composed of a bonded positive lens with a biconvex positive lens L24.
第3レンズ群G3は、物体側から順に、物体側に凹面を向けた負メニスカスレンズL31と、両凹形状の負レンズL32と物体側に凸面を向けた正メニスカスレンズL33との接合正レンズとからなる。
第4レンズ群G4は、両凸形状の正レンズL41からなる。
第5レンズ群G5は、物体側に凹面を向けた負メニスカスレンズL51からなる。
第6レンズ群G6は、両凸形状の正レンズL61からなる。
第7レンズ群G7は、物体側に凹面を向けた負メニスカスレンズL71からなる。The third lens group G3 includes, in order from the object side, a negative meniscus lens L31 having a concave surface facing the object side, a biconcave negative lens L32, and a positive meniscus lens L33 having a convex surface facing the object side. Consists of.
The fourth lens group G4 is composed of a biconvex positive lens L41.
The fifth lens group G5 is composed of a negative meniscus lens L51 with a concave surface facing the object side.
The sixth lens group G6 is composed of a biconvex positive lens L61.
The seventh lens group G7 is composed of a negative meniscus lens L71 with a concave surface facing the object side.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、第5レンズ群G5と第6レンズ群G6との間隔、および第6レンズ群G6と第7レンズ群G7との間隔が変化するように、第1レンズ群G1から第7レンズ群G7までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the seventh lens group G7 move along the optical axis so that the distance and the distance between the sixth lens group G6 and the seventh lens group G7 change.
本実施例に係る光学系では、合焦レンズ群として、第4レンズ群G4を光軸に沿って物体側へ移動させるとともに、第5レンズ群G5および第6レンズ群G6を、それぞれ第4レンズ群G4とは異なる軌跡で光軸に沿って物体側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fourth lens group G4 is moved to the object side along the optical axis, and the fifth lens group G5 and the sixth lens group G6 are each moved to the fourth lens. Focusing from an infinity object to a short-range object is performed by moving the object side along the optical axis with a trajectory different from that of the group G4.
以下の表8に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 8 below lists the specifications of the variable magnification optical system according to this embodiment.
(表8)第8実施例
[面データ]
m r d nd νd
OP ∞
1 250.0000 2.900 1.74389 49.53
* 2 28.0269 12.424
3 154.1167 2.100 1.59349 67.00
4 32.5416 6.969 2.00069 25.46
5 61.8764 可変
6 175.0869 5.997 1.81600 46.59
7 -52.8034 1.500 1.85000 27.03
8 -204.9882 1.000
9 45.2860 1.500 1.80518 25.45
10 26.6188 11.527 1.60300 65.44
11 -76.6492 可変
12(S) ∞ 2.465
13 -64.5009 1.300 1.90265 35.72
14 -217.6883 0.200
15 -214.1041 1.300 1.67270 32.18
16 26.6878 6.400 1.80809 22.74
17 502.6822 可変
18 65.6282 5.000 1.48749 70.32
19 -65.3105 可変
20 -52.0851 1.300 1.84666 23.80
21 -201.9547 可変
22 185.0000 5.300 1.58913 61.15
*23 -50.5905 可変
*24 -27.3977 1.500 1.58913 61.15
25 -49.4756 BF
I ∞
[非球面データ]
m:2
κ = 0.0000
A4 = 3.95960E-06
A6 = 3.76748E-09
A8 = -5.23494E-12
A10 = 1.04782E-14
A12 = -4.82160E-18
m:23
κ = 1.0000
A4 = 6.76320E-06
A6 = -8.33082E-09
A8 = 3.88079E-11
A10 = -7.09278E-14
m:24
κ = 1.0000
A4 = 5.00393E-06
A6 = -8.92918E-09
A8 = 2.86537E-11
A10 = -5.32582E-14
[各種データ]
変倍比 2.99
W M T
f 22.7 50.0 67.9
FNO 3.03 3.00 3.03
2ω 91.04 45.96 33.62
Ymax 19.30 21.60 21.60
TL 188.49 155.49 167.35
BF 16.20 23.37 32.67
W M T W M T
f,β 22.700 49.999 67.899 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 644.489 1474.05 2002.27
d5 64.883 10.266 5.946 64.883 10.266 5.946
d11 2.200 12.775 27.038 2.200 12.775 27.038
d17 20.035 8.462 6.571 19.026 7.439 4.593
d19 2.030 3.706 4.816 1.360 3.164 4.349
d21 4.601 9.046 14.467 4.908 8.936 15.092
d23 7.862 17.178 5.159 9.234 18.853 6.979
[レンズ群データ]
群 ST f
1 1 -42.744
2 6 40.599
3 12 -105.371
4 18 68.000
5 20 -83.229
6 22 68.000
7 24 -106.909
[条件式対応値]
(1) MTF1/MTF2 =0.809
(2) BFw/fw =0.713
(3) (−fFN)/|fF|= 1.224
(4) nP/nN= 0.806
(5) |fF1|/|f1| =1.591
(6) |fF2|/|f1| =1.591
(7) |fF1|/ft =1.001
(8) |fF2|/ft = 1.001
(9) |βWF1|/|βWF2| = 0.350
(10) |βRw|/|βRt| = 1.387
(11) ωw = 45.52°(Table 8) 8th Example [Surface data]
m r d nd ν d
OP ∞
1 250.0000 2.900 1.74389 49.53
* 2 28.0269 12.424
3 154.1167 2.100 1.59349 67.00
4 32.5416 6.969 2.00069 25.46
5 61.8764 Variable
6 175.0869 5.997 1.81600 46.59
7 -52.8034 1.500 1.85000 27.03
8 -204.9882 1.000
9 45.2860 1.500 1.80518 25.45
10 26.6188 11.527 1.60300 65.44
11 -76.6492 Variable
12 (S) ∞ 2.465
13 -64.5009 1.300 1.90265 35.72
14 -217.6883 0.200
15 -214.1041 1.300 1.67270 32.18
16 26.6878 6.400 1.80809 22.74
17 502.6822 Variable
18 65.6282 5.000 1.48749 70.32
19 -65.3105 Variable
20 -52.0851 1.300 1.84666 23.80
21 -201.9547 Variable
22 185.0000 5.300 1.58913 61.15
* 23 -50.5905 Variable
* 24-27.3977 1.500 1.58913 61.15
25 -49.4756 BF
I ∞
[Aspherical data]
m: 2
κ = 0.0000
A4 = 3.95960E-06
A6 = 3.76748E-09
A8 = -5.23494E-12
A10 = 1.04782E-14
A12 = -4.82160E-18
m: 23
κ = 1.0000
A4 = 6.76320E-06
A6 = -8.33082E-09
A8 = 3.88079E-11
A10 = -7.09278E-14
m: 24
κ = 1.0000
A4 = 5.00393E-06
A6 = -8.92918E-09
A8 = 2.86537E-11
A10 = -5.32582E-14
[Various data]
Law of multiple proportions 2.99
WMT
f 22.7 50.0 67.9
FNO 3.03 3.00 3.03
2ω 91.04 45.96 33.62
Ymax 19.30 21.60 21.60
TL 188.49 155.49 167.35
BF 16.20 23.37 32.67
W M T W M T
f, β 22.700 49.999 67.899 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 644.489 1474.05 2002.27
d5 64.883 10.266 5.946 64.883 10.266 5.946
d11 2.200 12.775 27.038 2.200 12.775 27.038
d17 20.035 8.462 6.571 19.026 7.439 4.593
d19 2.030 3.706 4.816 1.360 3.164 4.349
d21 4.601 9.046 14.467 4.908 8.936 15.092
d23 7.862 17.178 5.159 9.234 18.853 6.979
[Lens group data]
Group ST f
1 1 -42.744
2 6 40.599
3 12 -105.371
4 18 68.000
5 20 -83.229
6 22 68.000
7 24 -106.909
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 0.809
(2) BFw / fw = 0.713
(3) (-fFN) / | fF | = 1.224
(4) nP / nN = 0.806
(5) | fF1 | / | f1 | = 1.591
(6) | fF2 | / | f1 | = 1.591
(7) | fF1 | / ft = 1.001
(8) | fF2 | / ft = 1.001
(9) | βWF1 | / | βWF2 | = 0.350
(10) | βRw | / | βRt | = 1.387
(11) ωw = 45.52 °
図23A、図23B、及び図23Cはそれぞれ、第8実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図24A、図24B、及び図24Cはそれぞれ、第8実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。23A, 23B, and 23C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eighth embodiment, respectively.
24A, 24B, and 24C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eighth embodiment, respectively.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離物体合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, when a short-distance object is in focus. It can be seen that also has excellent imaging performance.
(第9実施例)
図25は、第9実施例に係る変倍光学系のレンズ構成を示す図である。
本実施例に係る変倍光学系は、物体側から順に、正屈折力を有する第1レンズ群G1と、負屈折力を有する第2レンズ群G2と、開口絞りSと、正屈折力を有する第3レンズ群G3と、負屈折力を有する第4レンズ群G4と、正屈折力を有する第5レンズ群G5と、正屈折力を有する第6レンズ群G6と、負屈折力を有する第7レンズ群G7とから構成されている。(9th Example)
FIG. 25 is a diagram showing a lens configuration of the variable magnification optical system according to the ninth embodiment.
The variable magnification optical system according to the present embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture aperture S, and a positive refractive power in order from the object side. A third lens group G3, a fourth lens group G4 having a negative refractive power, a fifth lens group G5 having a positive refractive power, a sixth lens group G6 having a positive refractive power, and a seventh lens group having a negative refractive power. It is composed of a lens group G7.
第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と両凸形状の正レンズL12との接合負レンズと、物体側に凸面を向けた正メニスカスレンズL13とからなる。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と、物体側に凹面を向けた負メニスカスレンズL22と物体側に凹面を向けた正メニスカスレンズL23と物体側に凹面を向けた負メニスカスレンズL24との接合負レンズとからなる。The first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side, in order from the object side. Consists of.
The second lens group G2 has a biconcave negative lens L21, a negative meniscus lens L22 with a concave surface facing the object side, a positive meniscus lens L23 with a concave surface facing the object side, and a concave surface on the object side in order from the object side. It consists of a bonded negative lens with a negative meniscus lens L24.
第3レンズ群G3は、物体側から順に、物体側に凸面を向けた正メニスカスレンズL31と、物体側に凸面を向けた負メニスカスレンズL32と物体側に凸面を向けた正メニスカスレンズL33との接合正レンズと、両凸形状の正レンズL34とからなる。
第4レンズ群G4は、物体側から順に、物体側に凹面を向けた正メニスカスレンズL41と、両凹形状の負レンズL42とからなる。
第5レンズ群G5は、両凸形状の正レンズL51と物体側に凹面を向けた負メニスカスレンズL52との接合正レンズからなる。
第6レンズ群G6は、物体側に凹面を向けた正メニスカスレンズL61からなる。
第7レンズ群G7は、両凹形状の負レンズL71からなる。The third lens group G3 includes a positive meniscus lens L31 having a convex surface facing the object side, a negative meniscus lens L32 having a convex surface facing the object side, and a positive meniscus lens L33 having a convex surface facing the object side in order from the object side. It is composed of a bonded positive lens and a biconvex positive lens L34.
The fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side and a negative lens L42 having a biconcave shape in order from the object side.
The fifth lens group G5 is composed of a biconvex positive lens L51 and a negative meniscus lens L52 with a concave surface facing the object side.
The sixth lens group G6 is composed of a positive meniscus lens L61 with a concave surface facing the object side.
The seventh lens group G7 is composed of a biconcave negative lens L71.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、第5レンズ群G5と第6レンズ群G6との間隔、および第6レンズ群G6と第7レンズ群G7との間隔が変化するように、第1レンズ群G1から第7レンズ群G7までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the seventh lens group G7 move along the optical axis so that the distance and the distance between the sixth lens group G6 and the seventh lens group G7 change.
本実施例に係る光学系では、合焦レンズ群として、第5レンズ群G5を光軸に沿って物体側へ移動させるとともに、第6レンズ群G6を第5レンズ群G5とは異なる軌跡で光軸に沿って物体側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fifth lens group G5 is moved to the object side along the optical axis, and the sixth lens group G6 is lighted with a trajectory different from that of the fifth lens group G5. Focusing from an infinity object to a short-range object is performed by moving it toward the object along the axis.
以下の表9に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 9 below lists the specifications of the variable magnification optical system according to this embodiment.
(表9)第9実施例
[面データ]
m r d nd νd
OP ∞
1 3442.9453 2.000 2.00100 29.12
2 67.9723 9.758 1.59319 67.90
3 -152.3923 0.200
4 58.4962 5.618 1.81600 46.59
5 401.1678 可変
* 6 -290.9507 1.400 1.88300 40.66
7 23.9500 5.968
8 -85.0139 1.200 1.83481 42.73
9 -120.7468 5.617 1.84666 23.80
10 -22.1853 1.200 1.81600 46.59
11 -285.7763 可変
12(S) ∞ 0.200
13 43.7782 3.108 1.69680 55.52
14 471.1855 0.200
15 32.7556 1.000 1.83481 42.73
16 21.7787 4.328 1.59319 67.90
17 90.7958 0.200
18 34.8267 4.022 1.58144 40.98
19 -155.1147 可変
*20 -30.2170 1.817 1.90200 25.26
21 -25.8045 0.200
22 -168.2619 1.000 1.90366 31.27
23 32.2596 可変
24 38.3747 4.859 1.49700 81.73
25 -32.4370 1.000 2.00069 25.46
26 -70.7616 可変
27 -63.4136 3.063 1.56732 42.58
*28 -25.4716 可変
*29 -40.3736 1.500 1.81600 46.59
30 223.1585 BF
I ∞
[非球面データ]
m:6
κ = 1.0000
A4 = 1.12990E-06
A6 = -1.48448E-09
A8 = 2.59485E-12
A10 = -2.03608E-15
m:20
κ = 1.0000
A4 = -1.25538E-05
A6 = 2.12431E-08
A8 = -1.35330E-10
A10 = 4.53472E-13
m:28
κ = 1.0000
A4 = 2.57266E-05
A6 = 5.03605E-08
A8 = -2.10329E-10
A10 = 3.98690E-13
m:29
κ = 1.0000
A4 = 1.23110E-05
A6 = 2.00664E-08
A8 = -1.99371E-10
A10 = 2.96093E-13
[各種データ]
変倍比 8.97
W M T
f 24.8 70.0 222.0
FNO 3.69 5.39 6.42
2ω 85.32 33.28 10.80
Ymax 20.30 21.60 21.60
TL 152.38 168.67 204.50
BF 13.25 40.90 75.50
W M T W M T
f,β 24.750 70.000 222.000 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 708.545 2047.97 6602.17
d5 2.000 19.489 42.969 2.000 19.489 42.969
d11 40.184 17.902 2.000 40.184 17.902 2.000
d19 2.003 3.971 9.577 2.003 3.971 9.577
d23 10.844 6.751 7.946 10.369 6.000 6.221
d26 15.034 12.261 4.050 14.947 12.499 5.206
d28 9.603 7.938 3.000 10.165 8.452 3.568
[レンズ群データ]
群 ST f
1 1 93.169
2 6 -21.680
3 12 24.825
4 20 -35.481
5 24 85.936
6 27 72.909
7 29 -41.791
[条件式対応値]
(1) MTF1/MTF2 =3.034
(2) BFw/fw =0.536
(3) (−fFN)/|fF|= 0.832
(4) nP/nN= 0.786
(5) |fF1|/|f1| = 0.922
(6) |fF2|/|f1| = 0.783
(7) |fF1|/ft = 0.387
(8) |fF2|/ft = 0.328
(9) |βWF1|/|βWF2| = 0.607
(10) |βRw|/|βRt| = 0.815
(11) ωw = 42.66°(Table 9) 9th Example [Surface data]
m r d nd ν d
OP ∞
1 3442.9453 2.000 2.00100 29.12
2 67.9723 9.758 1.59319 67.90
3 -152.3923 0.200
4 58.4962 5.618 1.81600 46.59
5 401.1678 Variable
* 6 -290.9507 1.400 1.88300 40.66
7 23.9500 5.968
8 -85.0139 1.200 1.83481 42.73
9 -120.7468 5.617 1.84666 23.80
10 -22.1853 1.200 1.81600 46.59
11 -285.7763 Variable
12 (S) ∞ 0.200
13 43.7782 3.108 1.69680 55.52
14 471.1855 0.200
15 32.7556 1.000 1.83481 42.73
16 21.7787 4.328 1.59319 67.90
17 90.7958 0.200
18 34.8267 4.022 1.58144 40.98
19 -155.1147 Variable
* 20 -30.2170 1.817 1.90200 25.26
21 -25.8045 0.200
22 -168.2619 1.000 1.90366 31.27
23 32.2596 Variable
24 38.3747 4.859 1.49700 81.73
25 -32.4370 1.000 2.00069 25.46
26 -70.7616 Variable
27 -63.4136 3.063 1.56732 42.58
* 28 -25.4716 Variable
* 29 -40.3736 1.500 1.81600 46.59
30 223.1585 BF
I ∞
[Aspherical data]
m: 6
κ = 1.0000
A4 = 1.12990E-06
A6 = -1.48448E-09
A8 = 2.59485E-12
A10 = -2.03608E-15
m: 20
κ = 1.0000
A4 = -1.25538E-05
A6 = 2.12431E-08
A8 = -1.35330E-10
A10 = 4.53472E-13
m: 28
κ = 1.0000
A4 = 2.57266E-05
A6 = 5.03605E-08
A8 = -2.10329E-10
A10 = 3.98690E-13
m: 29
κ = 1.0000
A4 = 1.23110E-05
A6 = 2.00664E-08
A8 = -1.99371E-10
A10 = 2.96093E-13
[Various data]
Law of multiple proportions 8.97
WMT
f 24.8 70.0 222.0
FNO 3.69 5.39 6.42
2ω 85.32 33.28 10.80
Ymax 20.30 21.60 21.60
TL 152.38 168.67 204.50
BF 13.25 40.90 75.50
W M T W M T
f, β 24.750 70.000 222.000 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 708.545 2047.97 6602.17
d5 2.000 19.489 42.969 2.000 19.489 42.969
d11 40.184 17.902 2.000 40.184 17.902 2.000
d19 2.003 3.971 9.577 2.003 3.971 9.577
d23 10.844 6.751 7.946 10.369 6.000 6.221
d26 15.034 12.261 4.050 14.947 12.499 5.206
d28 9.603 7.938 3.000 10.165 8.452 3.568
[Lens group data]
Group ST f
1 1 93.169
2 6 -21.680
3 12 24.825
4 20 -35.481
5 24 85.936
6 27 72.909
7 29 -41.791
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 3.034
(2) BFw / fw = 0.536
(3) (-fFN) / | fF | = 0.832
(4) nP / nN = 0.786
(5) | fF1 | / | f1 | = 0.922
(6) | fF2 | / | f1 | = 0.783
(7) | fF1 | / ft = 0.387
(8) | fF2 | / ft = 0.328
(9) | βWF1 | / | βWF2 | = 0.607
(10) | βRw | / | βRt | = 0.815
(11) ωw = 42.66 °
図26A、図26B、及び図26Cはそれぞれ、第9実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図27A、図27B、及び図27Cはそれぞれ、第9実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。26A, 26B, and 26C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the ninth embodiment, respectively.
27A, 27B, and 27C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the ninth embodiment, respectively.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離物体合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, when a short-distance object is in focus. It can be seen that also has excellent imaging performance.
(第10実施例)
図28は、第10実施例に係る変倍光学系のレンズ構成を示す図である。
本実施例に係る変倍光学系は、物体側から順に、正屈折力を有する第1レンズ群G1と、負屈折力を有する第2レンズ群G2と、正屈折力を有する第3レンズ群G3と、開口絞りSと、正屈折力を有する第4レンズ群G4と、負屈折力を有する第5レンズ群G5と、正屈折力を有する第6レンズ群G6とから構成されている。(10th Example)
FIG. 28 is a diagram showing a lens configuration of the variable magnification optical system according to the tenth embodiment.
In the variable magnification optical system according to the present embodiment, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side. It is composed of an aperture aperture S, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, and a sixth lens group G6 having a positive refractive power.
第1レンズ群G1は、物体側から順に、両凸形状の正レンズL11と、物体側に凸面を向けた負メニスカスレンズL12と両凸形状の正レンズL13との接合正レンズとからなる。
第2レンズ群G2は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL21と、物体側に凸面を向けた正メニスカスレンズL22と、両凹形状の負レンズL23と物体側に凸面を向けた正メニスカスレンズL24との接合負レンズとからなる。
第3レンズ群G3は、物体側から順に、両凸形状の正レンズL31と、両凸形状の正レンズL32と両凹形状の負レンズL33との接合正レンズとからなる。The first lens group G1 is composed of a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface facing the object side, and a junction positive lens L13 in order from the object side.
The second lens group G2 includes a negative meniscus lens L21 having a convex surface facing the object side, a positive meniscus lens L22 having a convex surface facing the object side, a biconcave negative lens L23, and a convex surface toward the object side in order from the object side. It consists of a junction negative lens with a positive meniscus lens L24 facing the lens.
The third lens group G3 is composed of a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 in this order from the object side.
第4レンズ群G4は、物体側に凸面を向けた負メニスカスレンズL41両凸形状の正レンズL42との接合正レンズからなる。
第5レンズ群G5は、物体側から順に、両凸形状の正レンズL51と、両凹形状の負レンズL52とからなる。
第6レンズ群G6は、物体側から順に、物体側に凹面を向けた負メニスカスレンズL61と、両凸形状の正レンズL62とからなる。The fourth lens group G4 comprises a negative meniscus lens L41 having a convex surface facing the object side and a junction positive lens L42 having a biconvex shape.
The fifth lens group G5 is composed of a biconvex positive lens L51 and a biconcave negative lens L52 in order from the object side.
The sixth lens group G6 is composed of a negative meniscus lens L61 having a concave surface facing the object side and a biconvex positive lens L62 in order from the object side.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、および第5レンズ群G5と第6レンズ群G6との間隔が変化するように、第1レンズ群G1から第6レンズ群G6までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the sixth lens group G6 move along the optical axis so that the distance between the lenses changes.
本実施例に係る光学系では、合焦レンズ群として、第4レンズ群G4を光軸に沿って物体側へ移動させるとともに、第5レンズ群G5を光軸に沿って像側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fourth lens group G4 is moved to the object side along the optical axis, and the fifth lens group G5 is moved to the image side along the optical axis. Focuses on a short-range object from an infinity object.
以下の表10に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 10 below lists the specifications of the variable magnification optical system according to this embodiment.
(表10)第10実施例
[面データ]
m r d nd νd
OP ∞
1 339.1302 3.342 1.48749 70.32
2 -1748.8042 0.200
3 113.3340 1.700 1.62004 36.40
4 62.3111 8.286 1.49700 81.73
5 -790.8224 可変
6 452.0591 1.300 1.80400 46.60
7 41.1492 4.042
8 41.3304 3.091 1.68893 31.16
9 98.8092 4.158
10 -68.4923 1.000 1.70000 48.10
11 36.0772 3.318 1.80518 25.45
12 117.8747 可変
13 180.8711 3.540 1.80400 46.60
14 -64.2101 0.200
15 40.7438 5.229 1.49700 81.73
16 -52.5435 1.200 1.85026 32.35
17 200.0407 1.376
18(S) ∞ 可変
19 68.3281 1.200 1.71736 29.57
20 20.1023 6.000 1.56732 42.58
21 -61.5874 可変
22 188.7697 2.905 1.72825 28.38
23 -56.4394 0.719
24 -72.6983 1.000 1.80400 46.60
25 30.9300 可変
26 -22.2025 1.300 1.69680 55.52
27 -38.2594 0.200
28 95.0769 3.373 1.80610 40.97
29 -205.8129 BF
I ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 100.0 292.0
FNO 4.68 4.86 5.88
2ω 33.86 24.02 8.26
Ymax 21.60 21.60 21.60
TL 193.32 209.38 244.81
BF 38.32 41.53 60.32
W M T W M T
f,β 72.100 100.000 292.000 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 2108.51 2898.12 8529.76
d5 2.000 26.301 76.285 2.000 26.301 76.285
d12 45.791 35.345 2.000 45.791 35.345 2.000
d18 29.471 29.387 29.007 28.880 29.181 28.801
d21 2.000 3.362 2.000 2.786 4.328 3.858
d25 16.057 14.780 16.521 15.862 14.019 14.868
[レンズ群データ]
群 ST f
1 1 171.900
2 6 -43.196
3 13 51.979
4 19 82.476
5 22 -51.000
6 26 48383.794
[条件式対応値]
(1) MTF1/MTF2 =0.125
(2) BFw/fw =0.531
(3) (−fFN)/|fF|= 0.527
(4) nP/nN= 0.913
(5) |fF1|/|f1| =0.480
(6) |fF2|/|f1| =0.297
(7) |fF1|/ft =0.282
(8) |fF2|/ft = 0.175
(9) |βWF1|/|βWF2| = 0.288
(10) |βRw|/|βRt| = 0.911
(11) ωw = 16.93°(Table 10) Example 10 [Surface data]
m r d nd ν d
OP ∞
1 339.1302 3.342 1.48749 70.32
2 -1748.8042 0.200
3 113.3340 1.700 1.62004 36.40
4 62.3111 8.286 1.49700 81.73
5 -790.8224 Variable
6 452.0591 1.300 1.80400 46.60
7 41.1492 4.042
8 41.3304 3.091 1.68893 31.16
9 98.8092 4.158
10 -68.4923 1.000 1.70000 48.10
11 36.0772 3.318 1.80518 25.45
12 117.8747 Variable
13 180.8711 3.540 1.80400 46.60
14 -64.2101 0.200
15 40.7438 5.229 1.49700 81.73
16 -52.5435 1.200 1.85026 32.35
17 200.0407 1.376
18 (S) ∞ Variable
19 68.3281 1.200 1.71736 29.57
20 20.1023 6.000 1.56732 42.58
21 -61.5874 Variable
22 188.7697 2.905 1.72825 28.38
23 -56.4394 0.719
24 -72.6983 1.000 1.80400 46.60
25 30.9300 Variable
26 -22.2025 1.300 1.69680 55.52
27 -38.2594 0.200
28 95.0769 3.373 1.80610 40.97
29 -205.8129 BF
I ∞
[Various data]
Variable ratio 4.05
WMT
f 72.1 100.0 292.0
FNO 4.68 4.86 5.88
2ω 33.86 24.02 8.26
Ymax 21.60 21.60 21.60
TL 193.32 209.38 244.81
BF 38.32 41.53 60.32
W M T W M T
f, β 72.100 100.000 292.000 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 2108.51 2898.12 8529.76
d5 2.000 26.301 76.285 2.000 26.301 76.285
d12 45.791 35.345 2.000 45.791 35.345 2.000
d18 29.471 29.387 29.007 28.880 29.181 28.801
d21 2.000 3.362 2.000 2.786 4.328 3.858
d25 16.057 14.780 16.521 15.862 14.019 14.868
[Lens group data]
Group ST f
1 1 171.900
2 6 -43.196
3 13 51.979
4 19 82.476
5 22 -51.000
6 26 48383.794
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 0.125
(2) BFw / fw = 0.531
(3) (-fFN) / | fF | = 0.527
(4) nP / nN = 0.913
(5) | fF1 | / | f1 | = 0.480
(6) | fF2 | / | f1 | = 0.297
(7) | fF1 | / ft = 0.282
(8) | fF2 | / ft = 0.175
(9) | βWF1 | / | βWF2 | = 0.288
(10) | βRw | / | βRt | = 0.911
(11) ωw = 16.93 °
図29A、図29B、及び図29Cはそれぞれ、第10実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図30A、図30B、及び図30Cはそれぞれ、第10実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。29A, 29B, and 29C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the tenth embodiment, respectively.
30A, 30B, and 30C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the tenth embodiment, respectively.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離物体合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, when a short-distance object is in focus. It can be seen that also has excellent imaging performance.
(第11実施例)
図31は、第11実施例に係る変倍光学系のレンズ構成を示す図である。
本実施例に係る変倍光学系は、物体側から順に、負屈折力を有する第1レンズ群G1と、正屈折力を有する第2レンズ群G2と、正屈折力を有する第3レンズ群G3と、開口絞りSと、負屈折力を有する第4レンズ群G4と、正屈折力を有する第5レンズ群G5と、正屈折力を有する第6レンズ群G6と、負屈折力を有する第7レンズ群G7とから構成されている。(11th Example)
FIG. 31 is a diagram showing a lens configuration of the variable magnification optical system according to the eleventh embodiment.
In the variable magnification optical system according to the present embodiment, the first lens group G1 having a negative refractive power, the second lens group G2 having a positive refractive power, and the third lens group G3 having a positive refractive power are arranged in this order from the object side. The aperture aperture S, the fourth lens group G4 having a negative refractive power, the fifth lens group G5 having a positive refractive power, the sixth lens group G6 having a positive refractive power, and the seventh lens group having a negative refractive power. It is composed of a lens group G7.
第1レンズ群G1は、物体側から順に、物体側に凸面を向けた負メニスカスレンズL11と、両凹形状の負レンズL12と物体側に凸面を向けた正メニスカスレンズL13との接合正レンズとからなる。
第2レンズ群G2は、両凸形状の正レンズL21と物体側に凹面を向けた負メニスカスレンズL22との接合正レンズからなる。
第3レンズ群G3は、物体側に凸面を向けた負メニスカスレンズL31と両凸形状の正レンズL32との接合正レンズからなる。The first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the object side, a biconcave negative lens L12, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side. Consists of.
The second lens group G2 is composed of a biconvex positive lens L21 and a junction positive lens L22 having a negative meniscus lens L22 with a concave surface facing the object side.
The third lens group G3 is composed of a junction positive lens of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32.
第4レンズ群G4は、両凹形状の負レンズL41と物体側に凸面を向けた正メニスカスレンズL42との接合負レンズからなる。
第5レンズ群G5は、両凸形状の正レンズL51からなる。
第6レンズ群G6は、両凸形状の正レンズL61からなる。
第7レンズ群G7は、物体側に凹面を向けた負メニスカスレンズL71からなる。The fourth lens group G4 is composed of a junction negative lens L41 having a biconcave shape and a positive meniscus lens L42 having a convex surface facing the object side.
The fifth lens group G5 is composed of a biconvex positive lens L51.
The sixth lens group G6 is composed of a biconvex positive lens L61.
The seventh lens group G7 is composed of a negative meniscus lens L71 with a concave surface facing the object side.
本実施例に係る変倍光学系では、広角端状態と望遠端状態との間での変倍時に、第1レンズ群G1と第2レンズ群G2との間隔、第2レンズ群G2と第3レンズ群G3との間隔、第3レンズ群G3と第4レンズ群G4との間隔、第4レンズ群G4と第5レンズ群G5との間隔、第5レンズ群G5と第6レンズ群G6との間隔、および第6レンズ群G6と第7レンズ群G7との間隔が変化するように、第1レンズ群G1から第7レンズ群G7までの全てのレンズ群が光軸に沿って移動する。 In the variable magnification optical system according to the present embodiment, when the magnification is changed between the wide-angle end state and the telescopic end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2 and the third lens group The distance between the lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6. All the lens groups from the first lens group G1 to the seventh lens group G7 move along the optical axis so that the distance and the distance between the sixth lens group G6 and the seventh lens group G7 change.
本実施例に係る光学系では、合焦レンズ群として、第5レンズ群G5を光軸に沿って物体側へ移動させるとともに、第6レンズ群G6を第5レンズ群G5とは異なる軌跡で光軸に沿って物体側へ移動させることにより、無限遠物体から近距離物体への合焦を行う。 In the optical system according to the present embodiment, as the focusing lens group, the fifth lens group G5 is moved to the object side along the optical axis, and the sixth lens group G6 is lighted with a trajectory different from that of the fifth lens group G5. Focusing from an infinity object to a short-range object is performed by moving it toward the object along the axis.
以下の表11に、本実施例に係る変倍光学系の諸元の値を掲げる。 Table 11 below lists the specifications of the variable magnification optical system according to this embodiment.
(表11)第11実施例
[面データ]
m r d nd νd
OP ∞
1 260.0000 2.900 1.74389 49.53
* 2 30.1702 13.784
3 -1991.6463 2.100 1.59349 67.00
4 33.7055 8.364 2.00100 29.13
5 89.6077 可変
6 108.4958 8.489 1.80100 34.92
7 -30.7757 1.500 1.80518 25.45
8 -204.3062 可変
9 45.1018 1.500 1.85000 27.03
10 24.0000 9.603 1.59319 67.90
11 -88.4112 可変
12(S) ∞ 1.733
13 -63.2999 1.300 1.65100 56.24
14 36.0420 2.727 1.90265 35.72
15 90.4648 可変
16 139.2934 5.000 1.48749 70.32
17 -72.7540 可変
18 554.8019 4.200 1.58913 61.15
*19 -54.8898 可変
*20 -29.0077 1.500 1.84666 23.80
21 -45.1973 BF
I ∞
[非球面データ]
m:2
κ = 0.0000
A4 = 3.70839E-06
A6 = 7.95920E-10
A8 = 7.22303E-12
A10 = -1.14971E-14
A12 = 9.51080E-18
m:19
κ = 1.0000
A4 = 5.13891E-06
A6 = -3.95654E-09
A8 = 1.36188E-11
A10 = -1.64821E-14
m:20
κ = 1.0000
A4 = 4.54393E-06
A6 = -1.30549E-09
A8 = 6.99274E-13
A10 = 4.71450E-15
[各種データ]
変倍比 2.99
W M T
f 22.7 50.0 67.9
FNO 4.21 5.58 5.88
2ω 92.68 46.22 33.64
Ymax 19.70 21.60 21.60
TL 188.49 156.49 166.42
BF 14.19 21.35 26.73
W M T W M T
f,β 22.700 50.000 67.900 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 642.626 1479.20 2020.08
d5 62.024 9.333 2.263 62.024 9.333 2.263
d8 1.536 1.576 1.000 1.536 1.576 1.000
d11 2.200 6.706 19.808 2.200 6.706 19.808
d15 25.740 8.889 12.359 25.733 7.830 10.488
d17 3.523 29.546 31.736 2.523 29.489 32.585
d19 14.577 14.391 7.819 15.584 15.506 8.840
[レンズ群データ]
群 ST f
1 1 -47.325
2 6 90.647
3 9 68.586
4 12 -74.902
5 16 98.800
6 18 85.000
7 20 -99.892
[条件式対応値]
(1) MTF1/MTF2 =1.831
(2) BFw/fw =0.625
(5) |fF1|/|f1| =2.088
(6) |fF2|/|f1| =1.796
(7) |fF1|/ft =1.455
(8) |fF2|/ft = 1.252
(9) |βWF1|/|βWF2| = 0.764
(10) |βRw|/|βRt| = 2.455
(11) ωw = 46.34°(Table 11) 11th Example [Surface data]
m r d nd ν d
OP ∞
1 260.0000 2.900 1.74389 49.53
* 2 30.1702 13.784
3 -1991.6463 2.100 1.59349 67.00
4 33.7055 8.364 2.00100 29.13
5 89.6077 Variable
6 108.4958 8.489 1.80100 34.92
7 -30.7757 1.500 1.80518 25.45
8-204.3062 Variable
9 45.1018 1.500 1.85000 27.03
10 24.0000 9.603 1.59319 67.90
11 -88.4112 Variable
12 (S) ∞ 1.733
13 -63.2999 1.300 1.65100 56.24
14 36.0420 2.727 1.90265 35.72
15 90.4648 Variable
16 139.2934 5.000 1.48749 70.32
17 -72.7540 Variable
18 554.8019 4.200 1.58913 61.15
* 19 -54.8898 Variable
* 20 -29.0077 1.500 1.84666 23.80
21 -45.1973 BF
I ∞
[Aspherical data]
m: 2
κ = 0.0000
A4 = 3.70839E-06
A6 = 7.95920E-10
A8 = 7.22303E-12
A10 = -1.14971E-14
A12 = 9.51080E-18
m: 19
κ = 1.0000
A4 = 5.13891E-06
A6 = -3.95654E-09
A8 = 1.36188E-11
A10 = -1.64821E-14
m: 20
κ = 1.0000
A4 = 4.54393E-06
A6 = -1.30549E-09
A8 = 6.99274E-13
A10 = 4.71450E-15
[Various data]
Law of multiple proportions 2.99
WMT
f 22.7 50.0 67.9
FNO 4.21 5.58 5.88
2ω 92.68 46.22 33.64
Ymax 19.70 21.60 21.60
TL 188.49 156.49 166.42
BF 14.19 21.35 26.73
W M T W M T
f, β 22.700 50.000 67.900 -0.033 -0.033 -0.033
d0 0.000 0.000 0.000 642.626 1479.20 2020.08
d5 62.024 9.333 2.263 62.024 9.333 2.263
d8 1.536 1.576 1.000 1.536 1.576 1.000
d11 2.200 6.706 19.808 2.200 6.706 19.808
d15 25.740 8.889 12.359 25.733 7.830 10.488
d17 3.523 29.546 31.736 2.523 29.489 32.585
d19 14.577 14.391 7.819 15.584 15.506 8.840
[Lens group data]
Group ST f
1 1 -47.325
2 6 90.647
3 9 68.586
4 12 -74.902
5 16 98.800
6 18 85.000
7 20 -99.892
[Conditional expression correspondence value]
(1) MTF1 / MTF2 = 1.831
(2) BFw / fw = 0.625
(5) | fF1 | / | f1 | = 2.088
(6) | fF2 | / | f1 | = 1.996
(7) | fF1 | / ft = 1.455
(8) | fF2 | / ft = 1.252
(9) | βWF1 | / | βWF2 | = 0.764
(10) | βRw | / | βRt | = 2.455
(11) ωw = 46.34 °
図32A、図32B、及び図32Cはそれぞれ、第11実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における無限遠物体合焦時の諸収差図である。
図33A、図33B、及び図33Cはそれぞれ、第11実施例に係る変倍光学系の広角端状態、中間焦点距離状態、望遠端状態における近距離物体合焦時の諸収差図である。32A, 32B, and 32C are aberration diagrams at the time of focusing an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eleventh embodiment, respectively.
33A, 33B, and 33C are aberration diagrams at the time of focusing a short-range object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eleventh embodiment, respectively.
各諸収差図より、本実施例に係る変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し優れた結像性能を有しており、さらに近距離物体合焦時にも優れた結像性能を有していることがわかる。 From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, when a short-distance object is in focus. It can be seen that also has excellent imaging performance.
上記各実施例によれば、広角端状態から望遠端状態への変倍時の収差変動、および無限遠物体から近距離物体への合焦時の収差変動を良好に抑える高い光学性能を備えた変倍光学系を実現することができる。さらに上記各実施例によれば、合焦レンズ群の軽量化および小型化を実現することができるので、合焦レンズ群の駆動機構を小型化し、鏡筒の大型化を招くことなく高速で静粛性の高い合焦動作を実現することができる。 According to each of the above embodiments, it has high optical performance that satisfactorily suppresses aberration fluctuations during scaling from the wide-angle end state to the telephoto end state and aberration fluctuations during focusing from an infinity object to a short-distance object. A variable magnification optical system can be realized. Further, according to each of the above embodiments, the weight and size of the focusing lens group can be reduced. Therefore, the drive mechanism of the focusing lens group can be reduced in size, and the lens barrel can be quieted at high speed without increasing the size. It is possible to realize a highly reliable focusing operation.
なお、上記各実施例は本願発明の一具体例を示しているものであり、本願発明はこれらに限定されるものではない。以下の内容は、本実施形態の変倍光学系の光学性能を損なわない範囲で適宜採用することが可能である。 It should be noted that each of the above examples shows a specific example of the present invention, and the present invention is not limited thereto. The following contents can be appropriately adopted as long as the optical performance of the variable magnification optical system of the present embodiment is not impaired.
本実施形態の変倍光学系の数値実施例として6群構成又は7群構成のものを示したが、本実施形態はこれに限られず、その他の群構成(例えば、8群等)の変倍光学系を構成することもできる。具体的には、上記各実施例の変倍光学系の最も物体側や最も像側にレンズ又はレンズ群を追加した構成でも構わない。或いは、隣り合うレンズ群とレンズ群との間にレンズ又はレンズ群を追加しても良い。 As a numerical example of the variable magnification optical system of the present embodiment, a 6-group configuration or a 7-group configuration is shown, but the present embodiment is not limited to this, and the scaling of other group configurations (for example, 8 groups, etc.) is shown. An optical system can also be configured. Specifically, a lens or a lens group may be added to the most object side or the most image side of the variable magnification optical system of each of the above embodiments. Alternatively, a lens or a lens group may be added between adjacent lens groups.
また、上記各実施例では、2つ又は3つのレンズ群を合焦レンズ群としたが、レンズ群の一部或いは4つ以上のレンズ群を合焦レンズ群としても良い。また、各合焦レンズ群は、1つ又は2つのレンズ成分から構成されていればよく、1つのレンズ成分からなる構成がより好ましい。斯かる合焦レンズ群は、オートフォーカスに適用することも可能であり、オートフォーカス用のモータ、例えば超音波モータ、ステッピングモータ、VCMモータ等による駆動にも適している。 Further, in each of the above embodiments, two or three lens groups are used as the focusing lens group, but a part of the lens group or four or more lens groups may be used as the focusing lens group. Further, each in-focus lens group may be composed of one or two lens components, and a configuration composed of one lens component is more preferable. Such a focusing lens group can also be applied to autofocus, and is also suitable for driving by a motor for autofocus, for example, an ultrasonic motor, a stepping motor, a VCM motor, or the like.
また、上記各実施例の変倍光学系において、いずれかのレンズ群全体又はその一部を、防振群として光軸に対して垂直な方向の成分を含むように移動させ、又は光軸を含む面内方向へ回転移動(揺動)させることにより、防振を行う構成とすることもできる。 Further, in the variable magnification optical system of each of the above embodiments, the entire lens group or a part thereof is moved as a vibration isolation group so as to include a component in the direction perpendicular to the optical axis, or the optical axis is moved. It is also possible to provide vibration isolation by rotating (swinging) in the in-plane direction including the lens.
また、上記各実施例の変倍光学系を構成するレンズのレンズ面は、球面又は平面としてもよく、或いは非球面としてもよい。レンズ面が球面又は平面の場合、レンズ加工及び組立調整が容易になり、レンズ加工及び組立調整の誤差による光学性能の劣化を防ぐことができるため好ましい。また、像面がずれた場合でも描写性能の劣化が少ないため好ましい。レンズ面が非球面の場合、研削加工による非球面、ガラスを型で非球面形状に成型したガラスモールド非球面、又はガラス表面に設けた樹脂を非球面形状に形成した複合型非球面のいずれでもよい。また、レンズ面は回折面としてもよく、レンズを屈折率分布型レンズ(GRINレンズ)或いはプラスチックレンズとしてもよい。 Further, the lens surface of the lens constituting the variable magnification optical system of each of the above embodiments may be spherical or flat, or may be aspherical. When the lens surface is spherical or flat, lens processing and assembly adjustment can be facilitated, and deterioration of optical performance due to errors in lens processing and assembly adjustment can be prevented, which is preferable. Further, even if the image plane is deviated, the depiction performance is less deteriorated, which is preferable. When the lens surface is aspherical, it can be either an aspherical surface obtained by grinding, a glass molded aspherical surface formed by molding glass into an aspherical shape, or a composite aspherical surface formed by forming a resin provided on the glass surface into an aspherical shape. Good. Further, the lens surface may be a diffraction surface, and the lens may be a refractive index distribution type lens (GRIN lens) or a plastic lens.
また、上記各実施例の変倍光学系において、開口絞りSは第2レンズ群G2と第3レンズ群G3との間、或いは第3レンズ群G3と第4レンズ群G4との間に配置されることが好ましいが、開口絞りとして部材を設けずにレンズ枠でその役割を代用する構成としてもよい。 Further, in the variable magnification optical system of each of the above embodiments, the aperture diaphragm S is arranged between the second lens group G2 and the third lens group G3, or between the third lens group G3 and the fourth lens group G4. However, a lens frame may substitute for the role of the aperture diaphragm without providing a member.
また、上記各実施例の変倍光学系を構成するレンズのレンズ面に、広い波長域で高い透過率を有する反射防止膜を施してもよい。これにより、フレアやゴーストを軽減し、高コントラストの高い光学性能を達成することができる。 Further, an antireflection film having a high transmittance in a wide wavelength range may be applied to the lens surface of the lens constituting the variable magnification optical system of each of the above embodiments. As a result, flare and ghost can be reduced, and high optical performance with high contrast can be achieved.
次に、本実施形態の変倍光学系を備えたカメラを図34に基づいて説明する。
図34は本実施形態の変倍光学系を備えたカメラの構成を示す図である。
図34に示すようにカメラ1は、撮影レンズ2として上記第1実施例に係る変倍光学系を備えたレンズ交換式の所謂ミラーレスカメラである。Next, the camera provided with the variable magnification optical system of the present embodiment will be described with reference to FIG. 34.
FIG. 34 is a diagram showing a configuration of a camera provided with the variable magnification optical system of the present embodiment.
As shown in FIG. 34, the
本カメラ1において、不図示の物体(被写体)からの光は、撮影レンズ2で集光されて、不図示のOLPF(Optical low pass filter:光学ローパスフィルタ)を介して撮像部3の撮像面上に被写体像を形成する。そして、撮像部3に設けられた光電変換素子によって被写体像が光電変換されて被写体の画像が生成される。この画像は、カメラ1に設けられたEVF(Electronic view finder:電子ビューファインダ)4に表示される。これにより撮影者は、EVF4を介して被写体を観察することができる。
また、撮影者によって不図示のレリーズボタンが押されると、撮像部3で生成された被写体の画像が不図示のメモリに記憶される。このようにして、撮影者は本カメラ1による被写体の撮影を行うことができる。In the
When the photographer presses the release button (not shown), the image of the subject generated by the
ここで、本カメラ1に撮影レンズ2として搭載した上記第1実施例に係る変倍光学系は、上述のように良好な光学性能を備え、合焦レンズ群の軽量化および小型化が図られている。すなわち本カメラ1は、広角端状態から望遠端状態への変倍時の収差変動と、無限遠物体から近距離物体への合焦時の収差変動とを良好に抑える高い光学性能を実現するとともに、合焦レンズ群の小型軽量化を図ることにより合焦動作の高速化を実現することができる。なお、上記第2〜第11実施例に係る変倍光学系を撮影レンズ2として搭載したカメラを構成しても、上記カメラ1と同様の効果を奏することができる。また、クイックリターンミラーを有し、ファインダ光学系によって被写体を観察する一眼レフタイプのカメラに上記各実施例に係る変倍光学系を搭載した場合でも、上記カメラ1と同様の効果を奏することができる。
Here, the variable magnification optical system according to the first embodiment mounted on the
次に、本実施形態の変倍光学系の製造方法の概略を図35に基づいて説明する。
図35は本実施形態の変倍光学系の製造方法の概略を示すフロー図である。Next, the outline of the manufacturing method of the variable magnification optical system of the present embodiment will be described with reference to FIG. 35.
FIG. 35 is a flow chart showing an outline of the manufacturing method of the variable magnification optical system of the present embodiment.
図35に示す本実施形態の変倍光学系の製造方法は、複数のレンズ群を有する変倍光学系の製造方法であって、以下のステップS1〜S3を含むものである。 The method for manufacturing the variable magnification optical system of the present embodiment shown in FIG. 35 is a method for manufacturing a variable magnification optical system having a plurality of lens groups, and includes the following steps S1 to S3.
ステップS1:複数のレンズ群を準備し、変倍時に各レンズ群の間隔が変化するように構成する。
ステップS2:複数のレンズ群が、合焦の際移動する物体側合焦レンズ群と、物体側合焦レンズ群より像側に配置され、合焦の際物体側合焦レンズ群とは異なる軌跡で移動する少なくとも一つの像側合焦レンズ群とを有するように構成する。
ステップS3:変倍光学系が以下の条件式(1)および(2)を満足するようにする。
(1)MTF1/MTF2 < 5.0
(2)0.2 < BFw/fw < 2.0
ただし、
MTF1:望遠端状態における無限遠物体から近距離物体への合焦の際の前記物体側合焦レンズ群の移動量の絶対値
MTF2:望遠端状態における無限遠物体から近距離物体への合焦の際の、前記像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の移動量の絶対値
BFw:広角端状態における前記変倍光学系のバックフォーカス
fw:広角端状態における前記変倍光学系の焦点距離Step S1: A plurality of lens groups are prepared, and the distance between the lens groups is changed at the time of magnification change.
Step S2: A plurality of lens groups are arranged on the image side of the object-side focusing lens group that moves during focusing and the object-side focusing lens group, and have different trajectories from the object-side focusing lens group during focusing. It is configured to have at least one image-side focusing lens group that moves with.
Step S3: Make the variable magnification optical system satisfy the following conditional equations (1) and (2).
(1) MTF1 / MTF2 <5.0
(2) 0.2 <BFw / fw <2.0
However,
MTF1: Absolute value of the amount of movement of the object-side focusing lens group when focusing from an infinity object to a short-range object in the telephoto end state MTF2: Focusing from an infinity object to a short-range object in the telephoto end state Absolute value of the amount of movement of the focusing lens group arranged on the object side of the image-side focusing lens group at the time of BFw: Back focus fw of the variable magnification optical system in the wide-angle end state: In the wide-angle end state Focal length of the variable magnification optical system
斯かる本実施形態の変倍光学系の製造方法によれば、広角端状態から望遠端状態への変倍時の収差変動と、無限遠物体から近距離物体への合焦時の収差変動とを良好に抑える高い光学性能を実現するとともに、合焦レンズ群の小型軽量化を図ることにより合焦動作の高速化を実現する変倍光学系を製造することができる。 According to the method for manufacturing the variable magnification optical system of the present embodiment, the aberration fluctuation at the time of scaling from the wide-angle end state to the telephoto end state and the aberration fluctuation at the time of focusing from an infinity object to a short-distance object. It is possible to manufacture a variable magnification optical system that realizes high-speed focusing operation by reducing the size and weight of the focusing lens group while realizing high optical performance that satisfactorily suppresses the aberration.
G1 第1レンズ群
G2 第2レンズ群
G3 第3レンズ群
G4 第4レンズ群
G5 第5レンズ群
G6 第6レンズ群
G7 第7レンズ群
S 開口絞り
I 像面
1 カメラ
2 撮影レンズG1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G5 5th lens group G6 6th lens group G7 7th lens group S Aperture aperture
Claims (19)
変倍時に前記各レンズ群の間隔が変化し、
前記複数のレンズ群は、合焦の際移動する物体側合焦レンズ群と、前記物体側合焦レンズ群より像側に配置され、合焦の際前記物体側合焦レンズ群とは異なる軌跡で移動する少なくとも一つの像側合焦レンズ群とを有し、
以下の条件式を満足する変倍光学系。
MTF1/MTF2 < 5.0
0.2 < BFw/fw < 2.0
ただし、
MTF1:望遠端状態における無限遠物体から近距離物体への合焦の際の前記物体側合焦レンズ群の移動量の絶対値
MTF2:望遠端状態における無限遠物体から近距離物体への合焦の際の、前記像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の移動量の絶対値
BFw:広角端状態における前記変倍光学系のバックフォーカス
fw:広角端状態における前記変倍光学系の焦点距離It has multiple lens groups and
The distance between each lens group changes during magnification change,
The plurality of lens groups are arranged on the image side of the object-side focusing lens group that moves during focusing and the object-side focusing lens group, and have different trajectories from the object-side focusing lens group during focusing. Has at least one image-side focusing lens group that moves with
A variable magnification optical system that satisfies the following conditional equation.
MTF1 / MTF2 <5.0
0.2 <BFw / fw <2.0
However,
MTF1: Absolute value of the amount of movement of the object-side focusing lens group when focusing from an infinity object to a short-range object in the telephoto end state MTF2: Focusing from an infinity object to a short-range object in the telephoto end state Absolute value of the amount of movement of the focusing lens group arranged on the object side of the image-side focusing lens group at the time of BFw: Back focus fw of the variable magnification optical system in the wide-angle end state: In the wide-angle end state Focal length of the variable magnification optical system
以下の条件式を満足する変倍光学系。
0.45 < (−fFN)/|fF| < 1.70
ただし、
fFN:前記物体側合焦レンズ群および前記像側合焦レンズ群内にあるレンズのうち、最も負の屈折力が強いレンズの焦点距離
fF:前記物体側合焦レンズ群および前記像側合焦レンズ群のうち、最も屈折力が強い合焦レンズ群の焦点距離At least one focusing lens group of the object-side focusing lens group and the image-side focusing lens group has at least one lens having a negative refractive power.
A variable magnification optical system that satisfies the following conditional equation.
0.45 <(-fFN) / | fF | <1.70
However,
fFN: Focal length of the lens having the strongest negative refractive power among the lenses in the object-side focusing lens group and the image-side focusing lens group fF: The object-side focusing lens group and the image-side focusing lens group Focal length of the focusing lens group with the strongest refractive power among the lens groups
以下の条件式を満足する請求項1から請求項7の何れか一項に記載の変倍光学系。
0.65 < nP/nN < 1.10
ただし、
nP:前記物体側合焦レンズ群および前記像側合焦レンズ群内にあるレンズのうち、最も正の屈折力が強いレンズの屈折率
nN:前記物体側合焦レンズ群および前記像側合焦レンズ群内にあるレンズのうち、最も負の屈折力が強いレンズの屈折率At least one focusing lens group of the object-side focusing lens group and the image-side focusing lens group has at least one lens having a negative refractive power.
The variable magnification optical system according to any one of claims 1 to 7, which satisfies the following conditional expression.
0.65 <nP / nN <1.10
However,
nP: Refractive coefficient of the lens having the strongest positive refractive power among the lenses in the object-side focusing lens group and the image-side focusing lens group nN: the object-side focusing lens group and the image-side focusing lens group Of the lenses in the lens group, the refractive power of the lens with the strongest negative power
0.40 < |fF1|/|f1| < 2.60
ただし、
fF1:前記物体側合焦レンズ群の焦点距離
f1:前記第1レンズ群の焦点距離The variable magnification optical system according to any one of claims 7 and 8, which satisfies the following conditional expression.
0.40 << | fF1 | / | f1 | <2.60
However,
fF1: Focal length of the object-side focusing lens group f1: Focal length of the first lens group
0.20 < |fF2|/|f1| < 3.80
ただし、
fF2:前記像側合焦レンズ群のうち最も像側に配置された合焦レンズ群の焦点距離
f1:前記第1レンズ群の焦点距離The variable magnification optical system according to any one of claims 7 to 9, which satisfies the following conditional expression.
0.20 << | fF2 | / | f1 | <3.80
However,
fF2: Focal length of the focusing lens group arranged on the image side of the image side focusing lens group f1: Focal length of the first lens group
前記物体側合焦レンズ群は、前記開口絞りより像側に配置されている請求項1から請求項11の何れか一項に記載の変倍光学系。Has an aperture stop
The variable magnification optical system according to any one of claims 1 to 11, wherein the object-side focusing lens group is arranged on the image side of the aperture diaphragm.
0.10 < |fF1|/ft < 3.00
ただし、
fF1:前記物体側合焦レンズ群の焦点距離
ft:望遠端状態における前記変倍光学系の焦点距離The variable magnification optical system according to any one of claims 1 to 12, which satisfies the following conditional expression.
0.10 << | fF1 | / ft <3.00
However,
fF1: Focal length of the object-side focusing lens group ft: Focal length of the variable magnification optical system in the telephoto end state
0.10 < |fF2|/ft < 3.00
ただし、
fF2:前記像側合焦レンズ群のうち最も像側に配置された合焦レンズ群の焦点距離
ft:望遠端状態における前記変倍光学系の焦点距離The variable magnification optical system according to any one of claims 1 to 13, which satisfies the following conditional expression.
0.10 << | fF2 | / ft <3.00
However,
fF2: Focal length of the focusing lens group arranged on the image side of the image side focusing lens group ft: Focal length of the variable magnification optical system in the telephoto end state
|βWF1|/|βWF2| < 4.00
ただし、
βWF1:無限遠物体合焦時の広角端状態における前記物体側合焦レンズ群の横倍率
βWF2:無限遠物体合焦時の広角端状態における、前記像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の横倍率The variable magnification optical system according to any one of claims 1 to 14, which satisfies the following conditional expression.
| βWF1 | / | βWF2 | <4.00
However,
βWF1: Lateral magnification of the object-side focusing lens group in the wide-angle end state when the object is in focus at infinity βWF2: The most object side of the image-side focusing lens group in the wide-angle end state when the infinity object is in focus Horizontal magnification of the arranged focusing lens group
|βRw|/|βRt| < 4.00
ただし、
βRw:無限遠物体合焦時の広角端状態における前記物体側合焦レンズ群から像面までの合成横倍率
βRt:無限遠物体合焦時の望遠端状態における前記物体側合焦レンズ群から像面までの合成横倍率The variable magnification optical system according to any one of claims 1 to 15, which satisfies the following conditional expression.
| βRw | / | βRt | <4.00
However,
βRw: Composite lateral magnification from the object-side focusing lens group to the image plane in the wide-angle end state when the infinity object is in focus βRt: Image from the object-side focusing lens group in the telephoto end state when the infinity object is in focus Composite horizontal magnification to the surface
15.0°<ωw<85.0°
ただし、
ωw:広角端状態における前記変倍光学系の半画角The variable magnification optical system according to any one of claims 1 to 16, which satisfies the following conditional expression.
15.0 ° <ωw <85.0 °
However,
ωw: Half angle of view of the variable magnification optical system in the wide-angle end state
変倍時に前記各レンズ群の間隔が変化するように構成し、
前記複数のレンズ群が、合焦の際移動する物体側合焦レンズ群と、前記物体側合焦レンズ群より像側に配置され、合焦の際前記物体側合焦レンズ群とは異なる軌跡で移動する少なくとも一つの像側合焦レンズ群とを有するように構成し、
以下の条件式を満足するように構成する変倍光学系の製造方法。
MTF1/MTF2 < 5.0
0.2 < BFw/fw < 2.0
ただし、
MTF1:望遠端状態における無限遠物体から近距離物体への合焦の際の前記物体側合焦レンズ群の移動量の絶対値
MTF2:望遠端状態における無限遠物体から近距離物体への合焦の際の、前記像側合焦レンズ群のうち最も物体側に配置された合焦レンズ群の移動量の絶対値
BFw:広角端状態における前記変倍光学系のバックフォーカス
fw:広角端状態における前記変倍光学系の焦点距離A method for manufacturing a variable magnification optical system having a plurality of lens groups.
It is configured so that the distance between the lens groups changes when the magnification is changed.
The plurality of lens groups are arranged on the image side of the object-side focusing lens group that moves during focusing and the object-side focusing lens group, and have different trajectories from the object-side focusing lens group during focusing. Configured to have at least one image-side focusing lens group that moves with
A method for manufacturing a variable magnification optical system that satisfies the following conditional equations.
MTF1 / MTF2 <5.0
0.2 <BFw / fw <2.0
However,
MTF1: Absolute value of the amount of movement of the object-side focusing lens group when focusing from an infinity object to a short-range object in the telephoto end state MTF2: Focusing from an infinity object to a short-range object in the telephoto end state Absolute value of the amount of movement of the focusing lens group arranged on the object side of the image side focusing lens group at the time of BFw: Back focus fw of the variable magnification optical system in the wide-angle end state: In the wide-angle end state Focal length of the variable magnification optical system
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