JP6970903B2 - Variable magnification optical system and optical equipment - Google Patents
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Description
本発明は、変倍光学系及び光学機器に関する。 The present invention relates to variable magnification optical systems and optical instruments.
従来、複数群のフォーカシングによる近距離合焦機能を有する変倍光学系が提案されている（例えば、特許文献１参照）。しかしながら、特許文献１は、さらなる光学性能の向上が要望されているという課題があった。
Conventionally, a variable magnification optical system having a short-distance focusing function by focusing a plurality of groups has been proposed (see, for example, Patent Document 1). However,
本発明の第１の態様に係る変倍光学系は、複数のレンズ群を有し、変倍時にレンズ群の間隔が変化する変倍光学系であって、開口絞りと、開口絞りより物体側に配置され、合焦時に光軸方向に移動する少なくとも１つの物体側合焦群と、開口絞りより像側に配置され、合焦時に光軸方向に移動する少なくとも１つの像側合焦群と、を有し、合焦時に、物体側合焦群と像側合焦群との移動軌跡は異なり、物体側合焦群より物体側に、少なくとも１つの物体側レンズ群を有し、変倍時に、物体側レンズ群と前記物体側合焦群との間隔が変化し、物体側合焦群の１つ及び像側合焦群の１つのうち、一方を第１合焦群とし、他方を第２合焦群としたとき、次式の条件を満足することを特徴とする。
｜ｆｆ１／ｆｆ２｜ ＜ １．０００
０．０１０ ＜ ｜ＦＺ２Ｔ／ＦＺ１Ｔ｜ ＜ １．０００
０．０５０ ＜ ｜ＦＺ２Ｗ／ＦＺ２Ｔ｜ ＜ ０．９５０
ｆｆ２ ≦ −３４．４７
但し、
ｆｆ１：第１合焦群の焦点距離
ｆｆ２：第２合焦群の焦点距離
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｗ：広角端状態且つ無限遠合焦状態において第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｔ：望遠端状態且つ無限遠合焦状態において第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
The variable magnification optical system according to the first aspect of the present invention is a variable magnification optical system having a plurality of lens groups and changing the distance between the lens groups at the time of magnification change, and is on the object side of the aperture aperture and the aperture aperture. At least one object-side focusing group arranged in the image side and moving in the optical axis direction at the time of focusing, and at least one image-side focusing group arranged on the image side of the aperture aperture and moving in the optical axis direction at the time of focusing. , The movement locus between the object-side focusing group and the image-side focusing group is different at the time of focusing, and there is at least one object-side lens group on the object side from the object-side focusing group, and the magnification is variable. Occasionally, the distance between the object-side lens group and the object-side focusing group changes, and one of the object-side focusing group and one of the image-side focusing group is designated as the first focusing group and the other is designated as the first focusing group. When the second focusing group is used, the condition of the following equation is satisfied.
｜ ff1 / ff2 ｜ <1,000
0.010 << | FZ2T / FZ1T | <1,000
0.050 << | FZ2W / FZ2T | <0.950
ff2 ≤ −34.47
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group FZ1T: When the first focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. Fluctuation amount of on-axis focal length position [mm]
FZ2W: Fluctuation amount of on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state [mm]
FZ2T: Fluctuation amount of on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and infinity focusing state [mm]
本発明の第２の態様に係る変倍光学系は、複数のレンズ群を有し、変倍時にレンズ群の間隔が変化する変倍光学系であって、開口絞りと、開口絞りより物体側に配置され、合焦時に光軸方向に移動する少なくとも１つの物体側合焦群と、開口絞りより像側に配置され、合焦時に光軸方向に移動する少なくとも１つの像側合焦群と、を有し、合焦時に、物体側合焦群と像側合焦群との移動軌跡は異なり、物体側合焦群の１つは、物体側に凹面を向けた負レンズからなり、物体側合焦群の１つ及び像側合焦群の１つのうち、一方を第１合焦群とし、他方を第２合焦群としたとき、次式の条件を満足することを特徴とする。 The variable magnification optical system according to the second aspect of the present invention is a variable magnification optical system having a plurality of lens groups and changing the distance between the lens groups at the time of magnification change, and is on the object side of the aperture aperture and the aperture aperture. At least one object-side focusing group arranged in the image side and moving in the optical axis direction at the time of focusing, and at least one image-side focusing group arranged on the image side of the aperture aperture and moving in the optical axis direction at the time of focusing. When focusing, the movement trajectory of the object-side focusing group and the image-side focusing group is different, and one of the object-side focusing groups consists of a negative lens with a concave surface facing the object side. Of the one of the side focusing group and the one of the image side focusing group, when one is the first focusing group and the other is the second focusing group, the condition of the following equation is satisfied. ..
｜ｆｆ１／ｆｆ２｜ ＜ １．０００｜ ff1 / ff2 ｜ <1,000
０．０１０ ＜ ｜ＦＺ２Ｔ／ＦＺ１Ｔ｜ ＜ １．０００0.010 << | FZ2T / FZ1T | <1,000
０．０５０ ＜ ｜ＦＺ２Ｗ／ＦＺ２Ｔ｜ ＜ ０．９５０0.050 << | FZ2W / FZ2T | <0.950
ｆｆ２ ≦ −３４．４７ff2 ≤ −34.47
但し、 However,
ｆｆ１：第１合焦群の焦点距離 ff1: Focal length of the first focusing group
ｆｆ２：第２合焦群の焦点距離 ff2: Focal length of the second focusing group
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ FZ1T: Fluctuation amount of on-axis focusing position when the first focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and infinity focusing state [mm]
ＦＺ２Ｗ：広角端状態且つ無限遠合焦状態において第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ FZ2W: Fluctuation amount of on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state [mm]
ＦＺ２Ｔ：望遠端状態且つ無限遠合焦状態において第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ FZ2T: Fluctuation amount of on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and infinity focusing state [mm]
本発明の第３の態様に係る変倍光学系は、複数のレンズ群を有し、変倍時にレンズ群の間隔が変化する変倍光学系であって、開口絞りと、開口絞りより物体側に配置され、合焦時に光軸方向に移動する少なくとも１つの物体側合焦群と、開口絞りより像側に配置され、合焦時に光軸方向に移動する少なくとも１つの像側合焦群と、を有し、合焦時に、物体側合焦群と像側合焦群との移動軌跡は異なり、物体側合焦群の１つ及び像側合焦群の１つのうち、一方を第１合焦群とし、他方を第２合焦群としたとき、次式の条件を満足することを特徴とする。 The variable magnification optical system according to the third aspect of the present invention is a variable magnification optical system having a plurality of lens groups and changing the distance between the lens groups at the time of magnification change, and is on the object side of the aperture aperture and the aperture aperture. At least one object-side focusing group arranged in the image side and moving in the optical axis direction at the time of focusing, and at least one image-side focusing group arranged on the image side of the aperture aperture and moving in the optical axis direction at the time of focusing. , And the movement locus between the object-side focusing group and the image-side focusing group is different at the time of focusing, and one of the object-side focusing group and one of the image-side focusing group is the first. When the in-focus group is used and the other is the second in-focus group, the condition of the following equation is satisfied.
｜ｆｆ１／ｆｆ２｜ ＜ １．０００｜ ff1 / ff2 ｜ <1,000
０．０１０ ＜ ｜ＦＺ２Ｔ／ＦＺ１Ｔ｜ ＜ １．０００0.010 << | FZ2T / FZ1T | <1,000
０．６００ ＜ ｜ＦＺ２Ｗ／ＦＺ２Ｔ｜ ＜ ０．９５０0.600 << | FZ2W / FZ2T | <0.950
ｆｆ２ ≦ −３４．４７ff2 ≤ −34.47
但し、 However,
ｆｆ１：第１合焦群の焦点距離 ff1: Focal length of the first focusing group
ｆｆ２：第２合焦群の焦点距離 ff2: Focal length of the second focusing group
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ FZ1T: Fluctuation amount of on-axis focusing position when the first focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and infinity focusing state [mm]
ＦＺ２Ｗ：広角端状態且つ無限遠合焦状態において第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ FZ2W: Fluctuation amount of on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state [mm]
ＦＺ２Ｔ：望遠端状態且つ無限遠合焦状態において第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ FZ2T: Fluctuation amount of on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and infinity focusing state [mm]
本発明の第４の態様に係る変倍光学系は、複数のレンズ群を有し、変倍時にレンズ群の間隔が変化する変倍光学系であって、開口絞りと、開口絞りより物体側に配置され、合焦時に光軸方向に移動する少なくとも１つの物体側合焦群と、開口絞りより像側に配置され、合焦時に光軸方向に移動する少なくとも１つの像側合焦群と、を有し、合焦時に、物体側合焦群と像側合焦群との移動軌跡は異なり、像側合焦群の１つを第１合焦群とし、物体側合焦群の１つを第２合焦群としたとき、次式の条件を満足することを特徴とする。
｜ｆｆ１／ｆｆ２｜ ＜ １．０００
ｆｆ１ ＞ ０
０．０１０ ＜ ｜ＦＺ１Ｗ／ＦＺ１Ｔ｜ ＜ ０．３５０
但し、
ｆｆ１：第１合焦群の焦点距離
ｆｆ２：第２合焦群の焦点距離
ＦＺ１Ｗ：広角端状態且つ無限遠合焦状態において第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
The variable magnification optical system according to the fourth aspect of the present invention is a variable magnification optical system having a plurality of lens groups and changing the distance between the lens groups at the time of magnification change. At least one object-side focusing group arranged in the image side and moving in the optical axis direction at the time of focusing, and at least one image-side focusing group arranged on the image side of the aperture aperture and moving in the optical axis direction at the time of focusing. , And the movement trajectory between the object-side focusing group and the image-side focusing group is different at the time of focusing, and one of the image-side focusing groups is set as the first focusing group, and one of the object-side focusing groups is set as 1. When one is the second focusing group, it is characterized by satisfying the condition of the following equation.
｜ ff1 / ff2 ｜ <1,000
ff1> 0
0.010 << | FZ1W / FZ1T | <0.350
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group
FZ1W: Fluctuation amount [mm] of the on-axis focusing position when the first focusing group moves 1 [mm] in the optical axis direction in the wide-angle end state and the infinity focusing state.
FZ1T: Fluctuation amount of on-axis focusing position when the first focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and infinity focusing state [mm]
以下、本発明の好ましい実施形態について図面を参照して説明する。図１に示すように、本実施形態に係る変倍光学系ＺＬは、複数のレンズ群を有し、変倍時にレンズ群の間隔が変化するように構成されている。この変倍光学系ＺＬは、開口絞りＳと、この開口絞りＳより物体側に配置され、合焦時に光軸方向に移動する少なくとも１つの物体側合焦群ＧｆＦと、開口絞りＳより像側に配置され、合焦時に光軸方向に移動する少なくとも１つの像側合焦群ＧｆＲと、を有している。また、この物体側合焦群ＧｆＦ及び像側合焦群ＧｆＲの合焦時における移動軌跡は異なるように構成されている。このように、開口絞りＳの前後に配置された複数の合焦群で合焦を行うことにより、近距離合焦時の軸外性能、特に像面湾曲を良好に補正できる。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the variable magnification optical system ZL according to the present embodiment has a plurality of lens groups, and is configured so that the distance between the lens groups changes at the time of magnification change. This variable-magnification optical system ZL is arranged on the object side of the aperture diaphragm S, at least one object-side focusing group GfF that moves in the optical axis direction at the time of focusing, and the image side of the aperture diaphragm S. It has at least one image-side focusing group GfR, which is arranged in the image and moves in the optical axis direction at the time of focusing. Further, the movement trajectories of the object-side focusing group GfF and the image-side focusing group GfR at the time of focusing are configured to be different. By performing focusing with a plurality of focusing groups arranged before and after the aperture stop S in this way, off-axis performance at short-distance focusing, particularly curvature of field can be satisfactorily corrected.
ここで、本実施形態に係る変倍光学系ＺＬは、物体側合焦群ＧｆＦの１つ及び像側合焦群ＧｆＲの１つのうち、一方を第１合焦群Ｇｆ１とし、他方を第２合焦群Ｇｆ２としたとき、以下に示す条件式（１）を満足する。 Here, in the variable magnification optical system ZL according to the present embodiment, one of the object-side focusing group GfF and the image-side focusing group GfR has one as the first focusing group Gf1 and the other as the second focusing group Gf1. When the in-focus group Gf2 is used, the following conditional expression (1) is satisfied.
｜ｆｆ１／ｆｆ２｜ ＜ １．０００ （１）
但し、
ｆｆ１：第１合焦群Ｇｆ１の焦点距離
ｆｆ２：第２合焦群Ｇｆ２の焦点距離
｜ ff1 / ff2 ｜ ＜ 1.000 (1)
However,
ff1: Focal length of the first focusing group Gf1 ff2: Focal length of the second focusing group Gf2
この条件式（１）は、物体側合焦群ＧｆＦの１つ及び像側合焦群ＧｆＲの１つのうち、屈折力の強い方を第１合焦群Ｇｆ１とし、屈折力の弱い方を第２合焦群Ｇｆ２として規定するものである。本実施形態に係る変倍光学系ＺＬにおいて、第１合焦群Ｇｆ１は、物体が移動したときにその像を像面に結像させる機能を有し、第２合焦群Ｇｆ２は、第１合焦群Ｇｆ１の移動による周辺部の収差（軸外収差）を補正する機能を有している。条件式（１）の上限値を上回ると、第１合焦群Ｇｆ１の屈折力が弱くなり、合焦時の移動量が増加するとともに、合焦時に発生する軸外収差、像面湾曲、コマ収差が大きく発生し過ぎてしまう。また、第２合焦群Ｇｆ２の屈折力が強くなりすぎると、像面湾曲補正を行う際に、球面収差の悪化を招いてしまう。なお、この条件式（１）の効果を確実にするために、条件式（１）の上限値を０．９００とすることが望ましい。また、この条件式（１）の効果を更に確実にするために、条件式（１）の上限値を０．８００とすることが望ましい。また、この条件式（１）の効果を更に確実にするために、条件式（１）の上限値を０．７００とすることが望ましい。また、この条件式（１）の効果を更に確実にするために、条件式（１）の上限値を０．６００とすることが望ましい。また、この条件式（１）の効果を更に確実にするために、条件式（１）の上限値を０．５００とすることが望ましい。 In this conditional equation (1), of one of the object-side focusing group GfF and one of the image-side focusing group GfR, the one with the stronger refractive power is designated as the first focusing group Gf1, and the one with the weaker refractive power is the first. It is defined as a two-focus group Gf2. In the variable magnification optical system ZL according to the present embodiment, the first focusing group Gf1 has a function of forming an image of the object on the image plane when the object moves, and the second focusing group Gf2 is the first. It has a function of correcting peripheral aberrations (off-axis aberrations) due to the movement of the in-focus group Gf1. When the upper limit of the conditional equation (1) is exceeded, the refractive power of the first focusing group Gf1 becomes weaker, the amount of movement during focusing increases, and off-axis aberrations, curvature of field, and coma that occur during focusing increase. Aberration is too large. Further, if the refractive power of the second focusing group Gf2 becomes too strong, the spherical aberration is deteriorated when the curvature of field is corrected. In order to ensure the effect of the conditional expression (1), it is desirable that the upper limit value of the conditional expression (1) is 0.900. Further, in order to further ensure the effect of the conditional expression (1), it is desirable to set the upper limit value of the conditional expression (1) to 0.800. Further, in order to further ensure the effect of the conditional expression (1), it is desirable to set the upper limit value of the conditional expression (1) to 0.700. Further, in order to further ensure the effect of the conditional expression (1), it is desirable to set the upper limit value of the conditional expression (1) to 0.600. Further, in order to further ensure the effect of the conditional expression (1), it is desirable to set the upper limit value of the conditional expression (1) to 0.500.
また、条件式（１）の下限値付近においては、第２合焦群Ｇｆ２の屈折力が弱くなり過ぎるため、像面湾曲補正を良好に行うことができなくなる。そのため、この条件式（１）の効果を確実にするために、条件式（１）の下限値を０．０２０とすることが望ましい。また、この条件式（１）の効果を更に確実にするために、条件式（１）の下限値を０．０４０とすることが望ましい。また、この条件式（１）の効果を更に確実にするために、条件式（１）の下限値を０．０６０とすることが望ましい。また、この条件式（１）の効果を更に確実にするために、条件式（１）の下限値を０．０８０とすることが望ましい。また、この条件式（１）の効果を更に確実にするために、条件式（１）の下限値を０．１００とすることが望ましい。 Further, in the vicinity of the lower limit of the conditional expression (1), the refractive power of the second focusing group Gf2 becomes too weak, so that the curvature of field correction cannot be performed satisfactorily. Therefore, in order to ensure the effect of the conditional expression (1), it is desirable to set the lower limit value of the conditional expression (1) to 0.020. Further, in order to further ensure the effect of the conditional expression (1), it is desirable to set the lower limit value of the conditional expression (1) to 0.040. Further, in order to further ensure the effect of the conditional expression (1), it is desirable to set the lower limit value of the conditional expression (1) to 0.060. Further, in order to further ensure the effect of the conditional expression (1), it is desirable to set the lower limit value of the conditional expression (1) to 0.080. Further, in order to further ensure the effect of the conditional expression (1), it is desirable to set the lower limit value of the conditional expression (1) to 0.100.
また、本実施形態に係る変倍光学系ＺＬは、以下に示す条件式（２）を満足することが望ましい。 Further, it is desirable that the variable magnification optical system ZL according to the present embodiment satisfies the conditional expression (2) shown below.
０．０１０ ＜ ｜ＦＺ２Ｔ／ＦＺ１Ｔ｜ ＜ １．０００ （２）
但し、
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において第１合焦群Ｇｆ１が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｔ：望遠端状態且つ無限遠合焦状態において第２合焦群Ｇｆ２が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
0.010 << | FZ2T / FZ1T | <1,000 (2)
However,
FZ1T: Fluctuation amount [mm] of the on-axis focusing position when the first focusing group Gf1 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
FZ2T: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group Gf2 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
条件式（２）は、良好な至近性能を得るために、広角端状態における、第１合焦群Ｇｆ１と第２合焦群Ｇｆ２との合焦位置感度を規定している。この条件式（２）を満足することにより、第１合焦群Ｇｆ１より第２合焦群Ｇｆ２の方が、軸上合焦位置変動量が小さくなる。上述したように、第２合焦群Ｇｆ２は軸外収差補正を行うため、軸上での合焦位置変動量が第１合焦群Ｇ１ｆよりも小さい必要があり、この変動量の差が大きいほど補正が容易となる。条件式（２）の上限値を上回ると、第２合焦群Ｇｆ２の軸上合焦位置変動量が大きくなり、軸上及び軸外合焦位置を揃えるために第１合焦群Ｇｆ１の移動量が大きくなり、近距離合焦時の球面収差やコマ収差が大きくなってしまう。なお、この条件式（２）の効果を確実にするために、条件式（２）の上限値を０．９００とすることが望ましい。また、この条件式（２）の効果を更に確実にするために、条件式（２）の上限値を０．８００とすることが望ましい。また、この条件式（２）の効果を更に確実にするために、条件式（２）の上限値を０．７５０とすることが望ましい。また、この条件式（２）の効果を更に確実にするために、条件式（２）の上限値を０．７００とすることが望ましい。一方、条件式（２）の下限値を下回ると、第２合焦群Ｇｆ２の屈折力が弱くなるため、軸外収差補正が困難になる。なお、この条件式（２）の効果を確実にするために、条件式（２）の下限値を０．０１５とすることが望ましい。また、この条件式（２）の効果を更に確実にするために、条件式（２）の下限値を０．０２０とすることが望ましい。また、この条件式（２）の効果を更に確実にするために、条件式（２）の下限値を０．０２５とすることが望ましい。また、この条件式（２）の効果を更に確実にするために、条件式（２）の下限値を０．０３０とすることが望ましい。 The conditional expression (2) defines the focusing position sensitivity of the first focusing group Gf1 and the second focusing group Gf2 in the wide-angle end state in order to obtain good close-up performance. By satisfying this conditional expression (2), the amount of on-axis focusing position fluctuation is smaller in the second focusing group Gf2 than in the first focusing group Gf1. As described above, since the second focusing group Gf2 corrects off-axis aberrations, the amount of fluctuation in the focusing position on the axis needs to be smaller than that of the first focusing group G1f, and the difference in the amount of fluctuation is large. The easier it is to make corrections. When the upper limit of the conditional expression (2) is exceeded, the amount of on-axis focusing position fluctuation of the second focusing group Gf2 becomes large, and the movement of the first focusing group Gf1 in order to align the on-axis and off-axis focusing positions. The amount becomes large, and spherical aberration and coma aberration at the time of short-range focusing become large. In order to ensure the effect of the conditional expression (2), it is desirable that the upper limit value of the conditional expression (2) is 0.900. Further, in order to further ensure the effect of the conditional expression (2), it is desirable to set the upper limit value of the conditional expression (2) to 0.800. Further, in order to further ensure the effect of the conditional expression (2), it is desirable to set the upper limit value of the conditional expression (2) to 0.750. Further, in order to further ensure the effect of the conditional expression (2), it is desirable to set the upper limit value of the conditional expression (2) to 0.700. On the other hand, if it is less than the lower limit of the conditional expression (2), the refractive power of the second focusing group Gf2 becomes weak, and it becomes difficult to correct the off-axis aberration. In order to ensure the effect of the conditional expression (2), it is desirable to set the lower limit value of the conditional expression (2) to 0.015. Further, in order to further ensure the effect of the conditional expression (2), it is desirable to set the lower limit value of the conditional expression (2) to 0.020. Further, in order to further ensure the effect of the conditional expression (2), it is desirable to set the lower limit value of the conditional expression (2) to 0.025. Further, in order to further ensure the effect of the conditional expression (2), it is desirable to set the lower limit value of the conditional expression (2) to 0.030.
また、本実施形態に係る変倍光学系ＺＬは、以下に示す条件式（３）を満足することが望ましい。 Further, it is desirable that the variable magnification optical system ZL according to the present embodiment satisfies the conditional expression (3) shown below.
０．０５０ ＜ ｜ＦＺ２Ｗ／ＦＺ２Ｔ｜ ＜ ０．９５０ （３）
但し、
ＦＺ２Ｗ：広角端状態且つ無限遠合焦状態において第２合焦群Ｇｆ２が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｔ：望遠端状態且つ無限遠合焦状態において第２合焦群Ｇｆ２が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
0.050 << | FZ2W / FZ2T | <0.950 (3)
However,
FZ2W: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group Gf2 moves 1 [mm] in the optical axis direction in the wide-angle end state and the infinity focusing state.
FZ2T: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group Gf2 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
条件式（３）は、良好な至近性能を得るために、第２合焦群Ｇｆ２における広角端状態及び望遠端状態の合焦位置感度を規定している。この条件式（３）を満足することにより、広角端状態より望遠端状態の方が、第２合焦群Ｇｆ２の合焦位置変動量が大きくなる。第２合焦群Ｇｆ２は、軸外収差補正を行うが、広角端状態では像面湾曲が発生しやすく、軸上での合焦位置変化が小さいことが望ましい。条件式（３）の上限値を上回ると、広角端状態での軸上、軸外合焦位置を良好に合わせることができなくなる。なお、この条件式（３）の効果を確実にするために、条件式（３）の上限値を０．９００とすることが望ましい。また、この条件式（３）の効果を更に確実にするために、条件式（３）の上限値を０．８５０とすることが望ましい。一方、条件式（３）の下限値を下回ると、望遠端状態での軸上、軸外合焦位置を良好に合わせることができなくなる。なお、この条件式（３）の効果を確実にするために、条件式（３）の下限値を０．２５０とすることが望ましい。また、この条件式（３）の効果を更に確実にするために、条件式（３）の下限値を０．３５０とすることが望ましい。また、この条件式（３）の効果を更に確実にするために、条件式（３）の下限値を０．５００とすることが望ましい。また、この条件式（３）の効果を更に確実にするために、条件式（３）の下限値を０．６００とすることが望ましい。 The conditional expression (3) defines the focusing position sensitivity in the wide-angle end state and the telephoto end state in the second focusing group Gf2 in order to obtain good close-up performance. By satisfying this conditional expression (3), the amount of change in the focusing position of the second focusing group Gf2 becomes larger in the telephoto end state than in the wide-angle end state. The second in-focus group Gf2 corrects off-axis aberrations, but it is desirable that curvature of field is likely to occur in the wide-angle end state and the change in in-focus position on the axis is small. If the upper limit of the conditional expression (3) is exceeded, it becomes impossible to satisfactorily align the on-axis and off-axis in-focus positions in the wide-angle end state. In order to ensure the effect of the conditional expression (3), it is desirable to set the upper limit value of the conditional expression (3) to 0.900. Further, in order to further ensure the effect of the conditional expression (3), it is desirable to set the upper limit value of the conditional expression (3) to 0.850. On the other hand, if it falls below the lower limit of the conditional expression (3), it becomes impossible to satisfactorily align the on-axis and off-axis focusing positions in the telephoto end state. In order to ensure the effect of the conditional expression (3), it is desirable that the lower limit value of the conditional expression (3) is 0.250. Further, in order to further ensure the effect of the conditional expression (3), it is desirable to set the lower limit value of the conditional expression (3) to 0.350. Further, in order to further ensure the effect of the conditional expression (3), it is desirable to set the lower limit value of the conditional expression (3) to 0.500. Further, in order to further ensure the effect of the conditional expression (3), it is desirable to set the lower limit value of the conditional expression (3) to 0.600.
また、本実施形態に係る変倍光学系ＺＬにおいて、像側合焦群ＧｆＲの１つを第１合焦群Ｇｆ１とし、物体側合焦群ＧｆＦの１つを第２合焦群とすることが望ましい。物体側合焦群ＧｆＦを第１合焦群Ｇｆ１とした場合、前玉径の大型化及び像面湾曲収差の発生が懸念されるため、像側合焦群ＧｆＲを第１合焦群Ｇｆ１にすることが望ましい。 Further, in the variable magnification optical system ZL according to the present embodiment, one of the image-side focusing group GfR is designated as the first focusing group Gf1, and one of the object-side focusing group GfF is designated as the second focusing group. Is desirable. When the object-side focusing group GfF is set to the first focusing group Gf1, there is a concern that the front lens diameter may increase and the field curvature aberration may occur. Therefore, the image-side focusing group GfR is set to the first focusing group Gf1. It is desirable to do.
また、本実施形態に係る変倍光学系ＺＬは、以下に示す条件式（４）を満足する、すなわち、第１合焦群Ｇｆ１は正の屈折力を有することが望ましい。 Further, it is desirable that the variable magnification optical system ZL according to the present embodiment satisfies the conditional expression (4) shown below, that is, the first focusing group Gf1 has a positive refractive power.
ｆｆ１ ＞ ０ （４）
但し、
ｆｆ１：第１合焦群Ｇｆ１の焦点距離
ff1> 0 (4)
However,
ff1: Focal length of the first focusing group Gf1
また、本実施形態に係る変倍光学系ＺＬは、以下に示す条件式（５）を満足する、すなわち、第２合焦群Ｇｆ２は負の屈折力を有することが望ましい。 Further, it is desirable that the variable magnification optical system ZL according to the present embodiment satisfies the conditional expression (5) shown below, that is, the second focusing group Gf2 has a negative refractive power.
ｆｆ２ ＜ ０ （５）
但し、
ｆｆ２：第２合焦群Ｇｆ２の焦点距離
ff2 <0 (5)
However,
ff2: Focal length of the second focusing group Gf2
なお、本実施形態に係る変倍光学系ＺＬは、条件式（５）を満足するときは、上述の条件式（３）に代えて、次の条件式（３′）を満足することが望ましい。 When the variable magnification optical system ZL according to the present embodiment satisfies the conditional expression (5), it is desirable that the following conditional expression (3') is satisfied instead of the above-mentioned conditional expression (3). ..
０．４００ ＜ ｜ＦＺ２Ｗ／ＦＺ２Ｔ｜ ＜ ０．９５０ （３′）
但し、
ＦＺ２Ｗ：広角端状態且つ無限遠合焦状態において第２合焦群Ｇｆ２が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｔ：望遠端状態且つ無限遠合焦状態において第２合焦群Ｇｆ２が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
0.400 << | FZ2W / FZ2T | <0.950 (3')
However,
FZ2W: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group Gf2 moves 1 [mm] in the optical axis direction in the wide-angle end state and the infinity focusing state.
FZ2T: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group Gf2 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
また、本実施形態に係る変倍光学系ＺＬは、以下に示す条件式（６）を満足することが望ましい。 Further, it is desirable that the variable magnification optical system ZL according to the present embodiment satisfies the conditional expression (6) shown below.
０．０１０ ＜ ｜ＦＺ１Ｗ／ＦＺ１Ｔ｜ ＜ １．５００ （６）
但し、
ＦＺ１Ｗ：広角端状態且つ無限遠合焦状態において第１合焦群Ｇｆ１が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において第１合焦群Ｇｆ１が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
0.010 << | FZ1W / FZ1T | <1.50 (6)
However,
FZ1W: Fluctuation amount [mm] of the on-axis focusing position when the first focusing group Gf1 moves 1 [mm] in the optical axis direction in the wide-angle end state and the infinity focusing state.
FZ1T: Fluctuation amount [mm] of the on-axis focusing position when the first focusing group Gf1 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
条件式（６）は、良好な至近性能を得るために、第１合焦群Ｇｆ１における広角端状態及び望遠端状態の合焦位置感度を規定している。この条件式（６）の上限値を上回ると、広角端状態での第１合焦群Ｇｆ１の軸上感度が高くなり、球面収差及びコマ収差の変動が大きくなるため、良好な至近性能を得ることができない。なお、この条件式（６）の効果を確実にするために、条件式（６）の上限値を０．７００とすることが望ましい。また、この条件式（６）の効果を更に確実にするために、条件式（６）の上限値を０．３５０とすることが望ましい。一方、条件式（６）の下限値を下回ると、望遠端状態での第１合焦群Ｇ１ｆの軸上感度が高くなり、球面収差及びコマ収差の変動が大きくなるため、良好な至近性能を得ることができない。なお、この条件式（６）の効果を確実にするために、条件式（６）の下限値を０．０５０とすることが望ましい。また、この条件式（６）の効果を更に確実にするために、条件式（６）の下限値を０．１００とすることが望ましい。 The conditional expression (6) defines the focusing position sensitivity in the wide-angle end state and the telephoto end state in the first focusing group Gf1 in order to obtain good close-up performance. When the upper limit of this conditional expression (6) is exceeded, the on-axis sensitivity of the first focusing group Gf1 in the wide-angle end state becomes high, and the fluctuations of spherical aberration and coma become large, so that good close-up performance is obtained. Can't. In order to ensure the effect of the conditional expression (6), it is desirable to set the upper limit value of the conditional expression (6) to 0.700. Further, in order to further ensure the effect of the conditional expression (6), it is desirable to set the upper limit value of the conditional expression (6) to 0.350. On the other hand, when the value is lower than the lower limit of the conditional expression (6), the on-axis sensitivity of the first focusing group G1f in the telephoto end state becomes high, and the fluctuations of spherical aberration and coma become large. I can't get it. In order to ensure the effect of the conditional expression (6), it is desirable that the lower limit value of the conditional expression (6) is 0.050. Further, in order to further ensure the effect of the conditional expression (6), it is desirable to set the lower limit value of the conditional expression (6) to 0.100.
また、本実施形態に係る変倍光学系ＺＬは、物体側合焦群ＧｆＦより物体側に、少なくとも１つの物体側レンズ群（例えば、図１における第２レンズ群Ｇ２）を有し、変倍時に、物体側レンズ群（第２レンズ群Ｇ２）と物体側合焦群ＧｆＦとの間隔が変化するように構成されていることが望ましい。物体側合焦群ＧｆＦより物体側に物体側レンズ群を配置することにより、この物体側レンズ群で物体側合焦群ＧｆＦへの光線を集光できたり、倍率をかけることができたりするため、物体側レンズ群ＧｆＦを比較的簡素で径の小さなレンズ群とすることができる。 Further, the variable magnification optical system ZL according to the present embodiment has at least one object-side lens group (for example, the second lens group G2 in FIG. 1) on the object side of the object-side focusing group GfF, and has a variable magnification. Occasionally, it is desirable that the distance between the object-side lens group (second lens group G2) and the object-side in-focus group GfF changes. By arranging the object-side lens group on the object side from the object-side focusing group GfF, the light beam to the object-side focusing group GfF can be focused or magnified by this object-side lens group. The object-side lens group GfF can be a relatively simple lens group with a small diameter.
また、本実施形態に係る変倍光学系ＺＬは、物体側合焦群ＧｆＦより物体側に、負の屈折力を有する負レンズ群を少なくとも１つ（例えば、図１における第２レンズ群Ｇ２）有し、変倍時に、負レンズ群（第２レンズ群Ｇ２）と物体側合焦群ＧｆＦとの間隔が変化するように構成されていることが望ましい。物体側合焦群ＧｆＦより物体側に負レンズ群を配置することにより、物体側合焦群ＧｆＦへの光線入射角度を抑制しやすくなるため、物体側合焦群ＧｆＦで発生する像面湾曲量を比較的小さくでき、像側合焦群ＧｆＲでの補正を容易にすることができる。 Further, the variable magnification optical system ZL according to the present embodiment has at least one negative lens group having a negative refractive power on the object side of the object-side focusing group GfF (for example, the second lens group G2 in FIG. 1). It is desirable that the lens group is configured so that the distance between the negative lens group (second lens group G2) and the object-side focusing group GfF changes at the time of scaling. By arranging the negative lens group on the object side of the object-side focusing group GfF, it becomes easier to suppress the angle of light incident on the object-side focusing group GfF, so that the amount of image plane curvature generated in the object-side focusing group GfF Can be made relatively small, and correction in the image-side focusing group GfR can be facilitated.
また、本実施形態に係る変倍光学系ＺＬは、物体側合焦群ＧｆＦより物体側に、正の屈折力を有する正レンズ群（例えば、図１における第１レンズ群Ｇ１）及び負の屈折力を有する負レンズ群（例えば、図１における第２レンズ群Ｇ２）を少なくとも１つずつ有し、変倍時に、正レンズ群（第１レンズ群Ｇ１）と負レンズ群（第２レンズ群Ｇ２）との間隔、及び、負レンズ群（第２レンズ群Ｇ２）と物体側合焦群ＧｆＦとの間隔が変化するように構成されていることが望ましい。上述した負レンズ群より更に物体側に正レンズ群を配置することにより、変倍比を増やしつつ、物体側及び像側合焦群ＧｆＦ，ＧｆＲを比較的小さくでき、また、合焦スピードを速くすることができる。 Further, the variable magnification optical system ZL according to the present embodiment has a positive lens group having a positive refractive force (for example, the first lens group G1 in FIG. 1) and negative refraction on the object side of the object-side focusing group GfF. It has at least one negative lens group (for example, the second lens group G2 in FIG. 1) having power, and at the time of scaling, a positive lens group (first lens group G1) and a negative lens group (second lens group G2). ) And the distance between the negative lens group (second lens group G2) and the object-side focusing group GfF are preferably configured to change. By arranging the positive lens group on the object side more than the negative lens group described above, the focusing ratio on the object side and the image side can be made relatively small and the focusing speed can be increased while increasing the magnification ratio. can do.
また、本実施形態に係る変倍光学系ＺＬにおいて、物体側合焦群ＧｆＦの１つは、物体側に凹面を向けた負レンズ（例えば、図１における負メニスカスレンズＬ３１）からなることが望ましい。このように構成することで、変倍時の球面収差及び像面湾曲収差変動を抑制することができる。また、効率良く変倍することができ、レンズの小型化に繋がる。 Further, in the variable magnification optical system ZL according to the present embodiment, it is desirable that one of the object-side focusing group GfF is a negative lens (for example, the negative meniscus lens L31 in FIG. 1) having a concave surface facing the object side. .. With this configuration, it is possible to suppress fluctuations in spherical aberration and curvature of field aberration during scaling. In addition, the magnification can be changed efficiently, which leads to the miniaturization of the lens.
また、本実施形態に係る変倍光学系ＺＬにおいて、物体側合焦群ＧｆＦ及び像側合焦群ＧｆＲはそれぞれ１つであることが望ましい。このように構成することで、簡素な構成で軸外光線の近距離性能を発揮させることができる。 Further, in the variable magnification optical system ZL according to the present embodiment, it is desirable that the object-side focusing group GfF and the image-side focusing group GfR are each one. With such a configuration, the short-range performance of off-axis light rays can be exhibited with a simple configuration.
また、本実施形態に係る変倍光学系ＺＬにおいて、第１合焦群Ｇｆ１は、以下に示す条件式（７）を満足するレンズ（例えば、図１における負メニスカスレンズＬ３１）を有することが望ましい。 Further, in the variable magnification optical system ZL according to the present embodiment, it is desirable that the first focusing group Gf1 has a lens (for example, the negative meniscus lens L31 in FIG. 1) that satisfies the conditional expression (7) shown below. ..
νｄ１ ＞ ４５．０ （７）
但し、
νｄ１：第１合焦群Ｇｆ１に含まれるレンズの媒質のｄ線に対するアッベ数
νd1> 45.0 (7)
However,
νd1: Abbe number with respect to the d-line of the medium of the lens included in the first focusing group Gf1.
第１合焦群Ｇｆ１に、条件式（７）を満足するレンズを配置することにより、この第１合焦群Ｇｆ１で発生する色収差を小さくすることができる。この条件式（７）の下限値を下回る、すなわち、アッベ数の小さい媒質でレンズを構成すると、色補正を行うために、この第１合焦群Ｇｆ１のレンズ枚数が増えてしまう。なお、この条件式（７）の効果を確実にするために、条件式（７）の下限値を４８．０にすることが望ましい。また、この条件式（７）の効果を更に確実にするために、条件式（７）の下限値を５０．０にすることが望ましい。また、この条件式（７）の効果を更に確実にするために、条件式（７）の下限値を５２．０にすることが望ましい。 By arranging a lens satisfying the conditional expression (7) in the first focusing group Gf1, the chromatic aberration generated in the first focusing group Gf1 can be reduced. If the lens is formed of a medium having a lower Abbe number, which is less than the lower limit of the conditional expression (7), the number of lenses in the first focusing group Gf1 increases in order to perform color correction. In order to ensure the effect of the conditional expression (7), it is desirable to set the lower limit value of the conditional expression (7) to 48.0. Further, in order to further ensure the effect of the conditional expression (7), it is desirable to set the lower limit value of the conditional expression (7) to 50.0. Further, in order to further ensure the effect of the conditional expression (7), it is desirable to set the lower limit value of the conditional expression (7) to 52.0.
また、本実施形態に係る変倍光学系ＺＬにおいて、物体側合焦群ＧｆＦは１つであって、１つの負レンズからなり、また、物体側合焦群ＧｆＦの物体側に対向する位置には負の屈折力を有する負レンズ群（例えば、図１における第２レンズ群Ｇ２）を有し、さらに、物体側合焦群ＧｆＦの像側に対向する位置には正の屈折力を有する正レンズ群（例えば、図１における第４レンズ群Ｇ４）を有するように構成されていることが望ましい。このように構成することで、物体側合焦群ＧｆＦの像倍率変化を小さくすることができる。 Further, in the variable magnification optical system ZL according to the present embodiment, the object-side focusing group GfF is one and consists of one negative lens, and the object-side focusing group GfF is located at a position facing the object side. Has a negative lens group having a negative refractive power (for example, the second lens group G2 in FIG. 1), and further has a positive refractive power at a position facing the image side of the object-side focusing group GfF. It is desirable that the lens group is configured to have a lens group (for example, the fourth lens group G4 in FIG. 1). With this configuration, it is possible to reduce the change in image magnification of the object-side focusing group GfF.
また、本実施形態に係る変倍光学系ＺＬにおいて、変倍時に、第２合焦群Ｇｆ２とこの第２合焦群Ｇｆ２の物体側に対向する位置に配置されるレンズ群（例えば、図１における第４レンズ群Ｇ４）との間隔が変化し、第２合焦群Ｇｆ２とこの第２合焦群Ｇｆ２の像側に対向する位置に配置されるレンズ群（例えば、図１における第６レンズ群Ｇ６）との間隔が変化するように構成されていることが望ましい。このように構成することにより、変倍時の球面収差及び像面湾曲収差変動を抑制することができる。 Further, in the variable magnification optical system ZL according to the present embodiment, a lens group (for example, FIG. 1) is arranged at a position facing the object side of the second focusing group Gf2 and the second focusing group Gf2 at the time of scaling. The distance from the fourth lens group G4) in FIG. 1 is changed, and the lens group (for example, the sixth lens in FIG. 1) is arranged at a position facing the image side of the second focusing group Gf2 and the second focusing group Gf2. It is desirable that it is configured so that the distance from the group G6) changes. With this configuration, it is possible to suppress fluctuations in spherical aberration and curvature of field aberration during scaling.
なお、以上で説明した条件及び構成は、それぞれが上述した効果を発揮するものであり、全ての条件及び構成を満たすものに限定されることはなく、いずれかの条件又は構成、或いは、いずれかの条件又は構成の組み合わせを満たすものでも、上述したそれぞれの効果を得ることが可能である。 It should be noted that the conditions and configurations described above are each exerting the above-mentioned effects, and are not limited to those satisfying all the conditions and configurations, and are any of the conditions or configurations, or any of them. It is possible to obtain each of the above-mentioned effects even if the combination of the above conditions or configurations is satisfied.
次に、本実施形態に係る変倍光学系ＺＬを備えた光学機器であるカメラを図１６に基づいて説明する。このカメラ１は、撮影レンズ２として本実施形態に係る変倍光学系ＺＬを備えたレンズ交換式の所謂ミラーレスカメラである。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り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。
Next, a camera, which is an optical device provided with the variable magnification optical system ZL according to the present embodiment, will be described with reference to FIG. The
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により光電変換された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。なお、本実施形態では、ミラーレスカメラの例を説明したが、カメラ本体にクイックリターンミラーを有しファインダー光学系により被写体を観察する一眼レフタイプのカメラに本実施形態に係る変倍光学系ＺＬ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。
Further, when the photographer presses the release button (not shown), the image photoelectrically converted by the
なお、以下に記載の内容は、光学性能を損なわない範囲で適宜採用可能である。 The contents described below can be appropriately adopted as long as the optical performance is not impaired.
本実施形態では、５群、６群、７群構成の変倍光学系ＺＬを示したが、以上の構成条件等は、４群、８群等の他の群構成にも適用可能である。また、最も物体側にレンズまたはレンズ群を追加した構成や、最も像面側にレンズまたはレンズ群を追加した構成でも構わない。具体的には、最も像面側に、変倍時又は合焦時に像面に対する位置を固定されたレンズ群を追加した構成が考えられる。また、群とは、変倍時、合焦時、縮筒時などの少なくとも１つで変化する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示すこととしてもよい。また、本実施形態の変倍光学系ＺＬは、変倍時に各群間の空気間隔が変化するように、第１レンズ群Ｇ１〜第５レンズ群Ｇ５（又は第６レンズ群Ｇ６、第７レンズ群Ｇ７）がそれぞれ光軸に沿って移動するように構成してもよい。また、レンズ成分とは、単レンズ又は複数のレンズが接合された接合レンズをいう。 In the present embodiment, the variable magnification optical system ZL having a 5-group, 6-group, and 7-group configuration is shown, but the above configuration conditions and the like can be applied to other group configurations such as the 4-group and 8-group. Further, a configuration in which a lens or a lens group is added on the most object side or a configuration in which a lens or a lens group is added on the most image plane side may be used. Specifically, it is conceivable to add a lens group whose position with respect to the image plane is fixed at the time of scaling or focusing on the image plane side. Further, the group may refer to a portion having at least one lens separated by an air interval that changes at least one such as at the time of scaling, focusing, and contraction. Further, in the variable magnification optical system ZL of the present embodiment, the first lens group G1 to the fifth lens group G5 (or the sixth lens group G6, the seventh lens) so that the air spacing between the groups changes at the time of magnification change. The group G7) may be configured to move along the optical axis. Further, the lens component means a single lens or a bonded lens in which a plurality of lenses are bonded.
また、２以上のレンズ群、２以上の部分レンズ群、または光学系全体を光軸方向に移動させて、無限遠物体から近距離物点への合焦を行う合焦群としてもよい。この場合、合焦群はオートフォーカスにも適用でき、オートフォーカス用のモータ駆動（ＤＣモータ、ステッピングモータ、ボイスコイルモータ等、モータの種類は限定されない）にも適している。例えば、上述した６群構成の場合は、第３レンズ群Ｇ３（物体側合焦群ＧｆＦ）及び第５レンズ群Ｇ５（像側合焦群ＧｆＲ）を合焦群とし、その他のレンズは合焦時に像面に対する位置を固定とするのが好ましい。モータにかかる負荷を考慮すると、合焦レンズ群は１つまたは２つのレンズ成分から構成するのが好ましい。また、物体側合焦群ＧｆＦと像側合焦群ＧｆＲとの間には、合焦時に光軸方向の位置を固定されるレンズを少なくとも１つ配置するのが好ましい。 Further, it may be a focusing group in which two or more lens groups, two or more partial lens groups, or the entire optical system is moved in the optical axis direction to focus from an infinite object to a short-distance object point. In this case, the in-focus group can be applied to autofocus, and is also suitable for driving a motor for autofocus (the type of motor is not limited, such as a DC motor, a stepping motor, and a voice coil motor). For example, in the case of the above-mentioned 6-group configuration, the 3rd lens group G3 (object-side focusing group GfF) and the 5th lens group G5 (image-side focusing group GfR) are set as the focusing group, and the other lenses are in focus. Sometimes it is preferable to fix the position with respect to the image plane. Considering the load applied to the motor, the in-focus lens group is preferably composed of one or two lens components. Further, it is preferable to arrange at least one lens whose position in the optical axis direction is fixed at the time of focusing between the object-side focusing group GfF and the image-side focusing group GfR.
また、レンズ群または部分レンズ群を光軸に直交方向の変位成分を持つように移動させ、または、光軸を含む面内方向に回転移動（揺動）させて、手振れによって生じる像ブレを補正する防振群としてもよい。特に、開口絞りＳより像側であって、像側合焦群ＧｆＲの物体側または像側に対向する位置に配置されたレンズ群の少なくとも一部を防振レンズ群としてもよい。また、防振レンズ群は、レンズ枚数に特に限定は無く、１枚の単レンズや複数のレンズ成分から構成することとしてもよい。 In addition, the lens group or partial lens group is moved so as to have a displacement component in the direction orthogonal to the optical axis, or is rotationally moved (swinged) in the in-plane direction including the optical axis to correct image shake caused by camera shake. It may be a vibration-proof group. In particular, at least a part of the lens group arranged on the image side of the aperture diaphragm S at a position facing the object side or the image side of the image side focusing group GfR may be used as the anti-vibration lens group. Further, the anti-vibration lens group is not particularly limited in the number of lenses, and may be composed of one single lens or a plurality of lens components.
また、レンズ面は、球面または平面で形成されても、非球面で形成されても構わない。レンズ面が球面または平面の場合、レンズ加工及び組立調整が容易になり、加工及び組立調整の誤差による光学性能の劣化を防げるので好ましい。また、像面がずれた場合でも描写性能の劣化が少ないので好ましい。レンズ面が非球面の場合、非球面は、研削加工による非球面、ガラスを型で非球面形状に形成したガラスモールド非球面、ガラスの表面に樹脂を非球面形状に形成した複合型非球面のいずれの非球面でも構わない。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 may be formed of a spherical surface or a flat surface, or may be formed of an aspherical surface. When the lens surface is a spherical surface or a flat surface, lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to errors in processing and assembly adjustment can be prevented, which is preferable. Further, even if the image plane is displaced, the deterioration of the depiction performance is small, which is preferable. When the lens surface is aspherical, the aspherical surface is an aspherical surface formed by grinding, a glass mold aspherical surface formed by forming glass into an aspherical shape, or a composite aspherical surface formed by forming resin on the surface of glass into an aspherical shape. Any aspherical surface may be used. 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.
開口絞りＳは、物体側合焦群ＧｆＦと像側合焦群ＧｆＲとの間に配置されるのが好ましいが、開口絞りとしての部材を設けずに、レンズの枠でその役割を代用してもよい。また、第１合焦群Ｇｆ１を開口絞りＳより像側に配置する場合、開口絞りＳと第１合焦群Ｇｆ１との間には、合焦時に光軸方向の位置を固定されるレンズを少なくとも１つ配置するのが好ましい。 The aperture diaphragm S is preferably arranged between the object-side focusing group GfF and the image-side focusing group GfR, but the role of the aperture diaphragm S is substituted by the lens frame without providing the member as the aperture diaphragm. May be good. Further, when the first focusing group Gf1 is arranged on the image side of the aperture stop S, a lens whose position in the optical axis direction is fixed at the time of focusing is inserted between the aperture stop S and the first focusing group Gf1. It is preferable to arrange at least one.
さらに、各レンズ面には、フレアやゴーストを軽減し高い光学性能を達成するために、反射防止膜を施してもよい。反射防止膜は、適宜選択可能であり、単層コーティングや、多層膜コーティングや、微細な結晶粒子からなる超低屈折率層を有する反射防止膜等、膜の種類は限定されない。反射防止膜を施す面数も特に限定されない。 Further, each lens surface may be provided with an antireflection film in order to reduce flare and ghost and achieve high optical performance. The antireflection film can be appropriately selected, and the type of film is not limited, such as a single layer coating, a multilayer film coating, and an antireflection film having an ultra-low refractive index layer made of fine crystal particles. The number of surfaces to which the antireflection film is applied is also not particularly limited.
以下、本実施形態に係る変倍光学系ＺＬの製造方法の概略を、図１７を参照して説明する。なお、ここでは図１に示す６群構成の変倍光学系ＺＬ１に基づいて説明するが、５群又は７群構成の場合においても同様である。まず、各レンズを配置して第１レンズ群Ｇ１〜第６レンズ群Ｇ６をそれぞれ準備し（ステップＳ１００）、開口絞りＳと、開口絞りＳより物体側に配置され、合焦時に光軸方向に移動する少なくとも１つの物体側合焦群ＧｆＦと、開口絞りＳより像側に配置され、合焦時に光軸方向に移動する少なくとも１つの像側合焦群ＧｆＲと、を配置し（ステップＳ２００）、合焦時に、物体側合焦群ＧｆＦと像側合焦群ＧｆＲとの移動軌跡は異なるように配置し（ステップＳ３００）、物体側合焦群ＧｆＦの１つ及び像側合焦群ＧｆＲの１つのうち、一方を第１合焦群Ｇｆ１とし、他方を第２合焦群Ｇｆ２としたとき、上述した条件を満足するように配置する（ステップＳ４００）。 Hereinafter, an outline of a method for manufacturing the variable magnification optical system ZL according to the present embodiment will be described with reference to FIG. Although the description will be given here based on the 6-group configuration variable magnification optical system ZL1 shown in FIG. 1, the same applies to the case of a 5-group or 7-group configuration. First, each lens is arranged to prepare the first lens group G1 to the sixth lens group G6 (step S100), arranged on the object side of the aperture aperture S and the aperture aperture S, and in the optical axis direction at the time of focusing. At least one moving object-side focusing group GfF and at least one image-side focusing group GfR arranged on the image side of the aperture aperture S and moving in the optical axis direction at the time of focusing are arranged (step S200). At the time of focusing, the movement trajectories of the object-side focusing group GfF and the image-side focusing group GfR are arranged so as to be different (step S300), and one of the object-side focusing group GfF and the image-side focusing group GfR are arranged. When one of them is the first focusing group Gf1 and the other is the second focusing group Gf2, they are arranged so as to satisfy the above-mentioned conditions (step S400).
具体的には、本実施形態では、例えば図１に示すように、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と両凸レンズＬ１２とを接合した接合正レンズ、及び、物体側に凸面を向けた正メニスカスレンズＬ１３を配置して第１レンズ群Ｇ１とし、物体側に凸面を向けた負メニスカスレンズＬ２１、物体側のレンズ面及び像側のレンズ面が非球面形状に形成された両凹レンズ形状の非球面負レンズＬ２２、及び、両凸レンズＬ２３を配置して第２レンズ群Ｇ２とし、物体側に凹面を向けた負メニスカスレンズＬ３１を配置して第３レンズ群Ｇ３とし、物体側のレンズ面及び像側のレンズ面が非球面形状に形成された両凸レンズ形状の非球面正レンズＬ４１、及び、両凸レンズＬ４２と両凹レンズＬ４３とを接合した接合負レンズを配置して第４レンズ群Ｇ４とし、両凹レンズＬ５１と物体側に凸面を向けた正メニスカスレンズＬ５２とを接合した接合負レンズを配置して第５レンズ群Ｇ５とし、物体側のレンズ面が非球面形状に形成された、物体側に凹面を向けた正メニスカスレンズ形状の非球面正レンズＬ６１、物体側のレンズ面が非球面形状に形成された両凸レンズ形状の非球面正レンズＬ６２と物体側に凹面を向けた負メニスカスレンズＬ６３とを接合した接合正レンズ、及び、物体側に凹面を向けた負メニスカスレンズＬ６４を配置して第６レンズ群Ｇ６とする。なお、開口絞りＳは第４レンズ群Ｇ４の最も物体側に配置する。また、第３レンズ群Ｇ３を物体側合焦群ＧｆＦ（第１合焦群Ｇｆ１）とし、第５レンズ群Ｇ５を像側合焦群ＧｆＲ（第２合焦群Ｇｆ２）とする。このように準備した各レンズ群を上述の手順で配置して変倍光学系ＺＬを製造する。 Specifically, in the present embodiment, for example, as shown in FIG. 1, a bonded positive lens in which a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are joined in order from the object side, and an object side. A positive meniscus lens L13 with a convex surface facing is arranged as a first lens group G1, a negative meniscus lens L21 with a convex surface facing the object side, a lens surface on the object side, and a lens surface on the image side are formed into an aspherical shape. An aspherical negative lens L22 having a biconcave lens shape and a biconvex lens L23 are arranged to form a second lens group G2, and a negative meniscus lens L31 having a concave surface facing the object side is arranged to form a third lens group G3. A fourth is arranged with an aspherical positive lens L41 having a biconvex lens shape in which the lens surface on the side and the lens surface on the image side are formed in an aspherical shape, and a bonded negative lens in which a biconvex lens L42 and a biconcave lens L43 are joined. A lens group G4 is formed, and a bonded negative lens obtained by joining a biconcave lens L51 and a positive meniscus lens L52 with a convex surface facing the object side is arranged to form a fifth lens group G5, and the lens surface on the object side is formed into an aspherical shape. In addition, the aspherical positive lens L61 having a positive meniscus lens shape with the concave surface facing the object side, the aspherical positive lens L62 having a biconvex lens shape with the lens surface on the object side formed into an aspherical shape, and the concave surface facing the object side. A bonded positive lens bonded to the negative meniscus lens L63 and a negative meniscus lens L64 with a concave surface facing the object side are arranged to form a sixth lens group G6. The aperture diaphragm S is arranged on the closest object side of the fourth lens group G4. Further, the third lens group G3 is referred to as an object-side focusing group GfF (first focusing group Gf1), and the fifth lens group G5 is referred to as an image-side focusing group GfR (second focusing group Gf2). Each lens group prepared in this way is arranged by the above-mentioned procedure to manufacture a variable magnification optical system ZL.
以下、本願の各実施例を、図面に基づいて説明する。なお、図１、図４、図７、図１０、及び、図１３は、各実施例に係る変倍光学系ＺＬ（ＺＬ１〜ＺＬ５）の構成及び屈折力配分を示す断面図である。また、これらの変倍光学系ＺＬ１〜ＺＬ５の断面図の下部には、広角端状態（Ｗ）から中間焦点距離状態（Ｍ）を経て望遠端状態（Ｔ）に変倍する際の、各レンズ群Ｇ１〜Ｇ５（又はＧ６、Ｇ７）の光軸に沿った移動方向、及び、無限遠合焦状態（∞）から至近合焦状態に合焦する際の物体側合焦群ＧｆＦ及び像側合焦群ＧｆＲの光軸に沿った移動方向が矢印で示されている。 Hereinafter, each embodiment of the present application will be described with reference to the drawings. In addition, FIG. 1, FIG. 4, FIG. 7, FIG. 10, and FIG. 13 are cross-sectional views showing the configuration and refractive power distribution of the variable magnification optical system ZL (ZL1 to ZL5) according to each embodiment. Further, in the lower part of the cross-sectional view of these variable magnification optical systems ZL1 to ZL5, each lens when changing the magnification from the wide-angle end state (W) to the telephoto end state (T) via the intermediate focal length state (M). The movement direction along the optical axis of the groups G1 to G5 (or G6, G7), and the object-side focusing group GfF and the image-side focusing when focusing from the infinity focusing state (∞) to the close focusing state. The direction of movement along the optical axis of the focal length group GfR is indicated by an arrow.
各実施例において、非球面は、光軸に垂直な方向の高さをｙとし、高さｙにおける各非球面の頂点の接平面から各非球面までの光軸に沿った距離（サグ量）をＳ（ｙ）とし、基準球面の曲率半径（近軸曲率半径）をｒとし、円錐定数をＫとし、ｎ次の非球面係数をＡnとしたとき、以下の式（ａ）で表される。なお、以降の実施例において、「ｅ−ｎ」は「×１０-n」を示す。 In each embodiment, the height of the aspherical surface in the direction perpendicular to the optical axis is y, and the distance (sag amount) along the optical axis from the tangent plane of the apex of each aspherical surface to each aspherical surface at the height y. Is S (y), the radius of curvature of the reference sphere (near-axis radius of curvature) is r, the conical constant is K, and the nth-order aspherical coefficient is An. .. In the following examples, " en " indicates "× 10 -n".
Ｓ（ｙ）＝（ｙ2／ｒ）／｛１＋（１−Ｋ×ｙ2／ｒ2）1/2｝
＋Ａ4×ｙ4＋Ａ6×ｙ6＋Ａ8×ｙ8＋Ａ10×ｙ10 （ａ）
S (y) = (y 2 / r) / {1+ (1-K × y 2 / r 2 ) 1/2 }
+ A4 x y 4 + A6 x y 6 + A8 x y 8 + A10 x y 10 (a)
なお、各実施例において、２次の非球面係数Ａ2は０である。また、各実施例の表中において、非球面には面番号の左側に＊印を付している。 In each embodiment, the second-order aspherical coefficient A2 is 0. Further, in the table of each embodiment, the aspherical surface is marked with * on the left side of the surface number.
［第１実施例］
図１は、第１実施例に係る変倍光学系ＺＬ１の構成を示す図である。この図１に示す変倍光学系ＺＬ１は、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、負の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４と、負の屈折力を有する第５レンズ群Ｇ５と、正の屈折力を有する第６レンズ群Ｇ６と、から構成されている。
[First Example]
FIG. 1 is a diagram showing a configuration of a variable magnification optical system ZL1 according to the first embodiment. The variable magnification optical system ZL1 shown in FIG. 1 has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a second lens group having a negative refractive power in order from the object side. It is composed of three lens groups G3, 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. ..
この変倍光学系ＺＬ１において、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と両凸レンズＬ１２とを接合した接合正レンズ、及び、物体側に凸面を向けた正メニスカスレンズＬ１３を有して構成されている。また、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、物体側のレンズ面及び像側のレンズ面が非球面形状に形成された両凹レンズ形状の非球面負レンズＬ２２、及び、両凸レンズＬ２３を有して構成されている。また、第３レンズ群Ｇ３は、物体側に凹面を向けた負メニスカスレンズＬ３１を有して構成されている。また、第４レンズ群Ｇ４は、物体側から順に、物体側のレンズ面及び像側のレンズ面が非球面形状に形成された両凸レンズ形状の非球面正レンズＬ４１、及び、両凸レンズＬ４２と両凹レンズＬ４３とを接合した接合負レンズを有して構成されている。また、第５レンズ群Ｇ５は、物体側から順に、両凹レンズＬ５１と物体側に凸面を向けた正メニスカスレンズＬ５２とを接合した接合負レンズを有して構成されている。また、第６レンズ群Ｇ６は、物体側から順に、物体側のレンズ面が非球面形状に形成された、物体側に凹面を向けた正メニスカスレンズ形状の非球面正レンズＬ６１、物体側のレンズ面が非球面形状に形成された両凸レンズ形状の非球面正レンズＬ６２と物体側に凹面を向けた負メニスカスレンズＬ６３とを接合した接合正レンズ、及び、物体側に凹面を向けた負メニスカスレンズＬ６４を有して構成されている。また、開口絞りＳは、第４レンズ群Ｇ４の最も物体側のレンズ面（第１５面）の物体側に配置されている。 In this variable magnification optical system ZL1, the first lens group G1 has a bonded positive lens in which a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are joined in order from the object side, and a convex surface on the object side. It is configured to have a positive meniscus lens L13 directed toward it. Further, the second lens group G2 has a negative meniscus lens L21 having a convex surface facing the object side in order from the object side, and a non-concave lens shape in which the lens surface on the object side and the lens surface on the image side are formed in an aspherical shape. It is configured to have a spherical negative lens L22 and a biconvex lens L23. Further, the third lens group G3 is configured to have a negative meniscus lens L31 with a concave surface facing the object side. Further, the fourth lens group G4 includes an aspherical positive lens L41 having a biconvex lens shape in which the lens surface on the object side and the lens surface on the image side are formed in an aspherical shape, and a biconvex lens L42 in order from the object side. It is configured to have a bonded negative lens bonded to the concave lens L43. Further, the fifth lens group G5 is configured to have a bonded negative lens in which a biconcave lens L51 and a positive meniscus lens L52 having a convex surface facing the object side are joined in order from the object side. Further, the sixth lens group G6 includes an aspherical positive lens L61 having a positive meniscus lens shape with a concave surface facing the object side, in which the lens surface on the object side is formed in an aspherical shape in order from the object side, and a lens on the object side. A bonded positive lens in which an aspherical positive lens L62 having a biconvex lens shape with a surface formed into an aspherical shape and a negative meniscus lens L63 having a concave surface facing the object side are joined, and a negative meniscus lens having a concave surface facing the object side. It has L64 and is configured. Further, the aperture diaphragm S is arranged on the object side of the lens surface (15th surface) on the most object side of the fourth lens group G4.
この変倍光学系ＺＬ１では、広角端状態から望遠端状態への変倍に際し、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔が増大し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との空気間隔が減少し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との空気間隔が増大し、第５レンズ群Ｇ５と第６レンズ群Ｇ６との空気間隔が減少し、第６レンズ群Ｇ６と像面Ｉとの空気間隔が増大するように、第１レンズ群Ｇ１から第６レンズ群Ｇ６の各レンズ群が光軸上を移動する。なお、開口絞りＳは、変倍に際し第４レンズ群Ｇ４とともに移動する。 In this variable magnification optical system ZL1, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telescopic end state, and the second lens group G2 and the third lens group The air gap with G3 increases, the air gap between the third lens group G3 and the fourth lens group G4 decreases, the air gap between the fourth lens group G4 and the fifth lens group G5 increases, and the fifth lens Each lens group of the first lens group G1 to the sixth lens group G6 so that the air distance between the group G5 and the sixth lens group G6 decreases and the air distance between the sixth lens group G6 and the image plane I increases. Moves on the optical axis. The aperture stop S moves together with the fourth lens group G4 at the time of scaling.
また、この変倍光学系ＺＬ１では、物体側合焦群ＧｆＦを第３レンズ群Ｇ３とし、像側合焦群ＧｆＲを第５レンズ群Ｇ５とし、無限遠物体から近距離物体への合焦は、第１レンズ群Ｇ１、第２レンズ群Ｇ２、第４レンズ群Ｇ４及び第６レンズ群Ｇ６を像面Ｉに対して固定とし、物体側合焦群ＧｆＦである第３レンズ群Ｇ３を光軸に沿って像側から物体側に移動させ、像側合焦群ＧｆＲである第５レンズ群Ｇ５を光軸に沿って像側から物体側に移動させることにより行うように構成されている。なお、この合焦において、物体側合焦群ＧｆＦと像側合焦群ＧｆＲとの移動軌跡は異なるように構成されている。 Further, in this variable magnification optical system ZL1, the object-side focusing group GfF is set to the third lens group G3, the image-side focusing group GfR is set to the fifth lens group G5, and focusing from an infinity object to a short-range object is performed. , 1st lens group G1, 2nd lens group G2, 4th lens group G4 and 6th lens group G6 are fixed to the image plane I, and the 3rd lens group G3 which is the object side focusing group GfF is the optical axis. It is configured to move from the image side to the object side along the image side, and to move the fifth lens group G5, which is the image side focusing group GfR, from the image side to the object side along the optical axis. In this focusing, the movement loci of the object-side focusing group GfF and the image-side focusing group GfR are configured to be different.
以下に、第１実施例に係る変倍光学系ＺＬ１の諸元の値を掲げる。ここで、以下の全ての諸元値において掲載されている焦点距離ｆ、曲率半径ｒ、面間隔ｄ、その他長さの単位は一般に「ｍｍ」が使われるが、光学系は、比例拡大または比例縮小しても同等の光学性能が得られるので、これに限られるものではない。また、これらの符号の説明及び諸元表の説明は以降の実施例においても同様である。 The values of the specifications of the variable magnification optical system ZL1 according to the first embodiment are listed below. Here, "mm" is generally used as the unit of the focal length f, the radius of curvature r, the surface spacing d, and other lengths listed in all the following specification values, but the optical system is proportionally expanded or proportional. It is not limited to this because the same optical performance can be obtained even if the size is reduced. Further, the description of these reference numerals and the description of the specification table are the same in the following examples.
まず、表１に全体諸元を示す。この全体諸元において、ｆは全系の焦点距離、ＦＮＯはＦナンバー、ωは半画角［°］、Ｙは最大像高、ＴＬは全長、及び、ＢＦはバックフォーカスの値を表しており、広角端状態（Ｗ）、中間焦点距離状態（Ｍ）及び望遠端状態（Ｔ）のそれぞれにおける値が示されている。ここで、全長ＴＬは、無限合焦時の最も物体側のレンズ面（図１における第１面）から像面Ｉまでの光軸上の距離を示している。また、バックフォーカスＢＦは、無限遠合焦時の最も像側のレンズ面（図１における第２９面）から像面Ｉまでの光軸上の距離を示している。なお、ＢＦ（ａｉｒ）はバックフォーカスの空気換算長を示している。 First, Table 1 shows the overall specifications. In this overall specification, f is the focal length of the entire system, FNO is the F number, ω is the half angle of view [°], Y is the maximum image height, TL is the total length, and BF is the back focus value. , Wide-angle end state (W), intermediate focal length state (M), and telephoto end state (T) are shown. Here, the total length TL indicates the distance on the optical axis from the lens surface (first surface in FIG. 1) on the most object side to the image plane I at the time of infinite focusing. Further, the back focus BF indicates the distance on the optical axis from the lens plane on the image side (29th plane in FIG. 1) to the image plane I at the time of focusing at infinity. In addition, BF (air) indicates the air conversion length of the back focus.
次に、表２にレンズデータを示す。このレンズデータにおける第１欄ｍは、光線の進行する方向に沿った物体側からのレンズ面の順序（面番号）を、第２欄ｒは、各レンズ面の曲率半径を、第３欄ｄは、各光学面から次の光学面までの光軸上の距離（面間隔）を、第４欄ｎｄ及び第５欄νｄは、ｄ線（λ＝５８７．６ｎｍ）に対する屈折率及びアッベ数を示している。また、曲率半径0.00000は平面を示し、空気の屈折率1.00000は省略してある。 Next, Table 2 shows the lens data. In this lens data, the first column m is the order (plane number) of the lens surfaces from the object side along the traveling direction of the light beam, the second column r is the radius of curvature of each lens surface, and the third column d. Is the distance (plane spacing) on the optical axis from each optical surface to the next optical surface, and the fourth column nd and the fifth column νd are the refractive index and Abbe number with respect to the d line (λ = 587.6 nm). Shows. The radius of curvature of 0.00000 indicates a plane, and the refractive index of air of 1.00000 is omitted.
また、表３にレンズ群焦点距離を示す。このレンズ群焦点距離におけるｇは各レンズ群の符号を、ｍは各レンズ群の始面（最も物体側のレンズ面の面番号）を、ｆｇは各レンズ群の焦点距離を示している。 Table 3 shows the focal lengths of the lens groups. In this lens group focal length, g indicates the code of each lens group, m indicates the starting surface of each lens group (the surface number of the lens surface on the most object side), and fg indicates the focal length of each lens group.
この変倍光学系ＺＬ１において、第８面、第９面、第１５面、第１６面、第２３面及び第２５面は非球面形状に形成されている。次の表４に、非球面のデータ、すなわち円錐定数Ｋ及び各非球面定数Ａ4〜Ａ10の値を示す。 In this variable magnification optical system ZL1, the eighth surface, the ninth surface, the fifteenth surface, the sixteenth surface, the 23rd surface, and the 25th surface are formed in an aspherical shape. Table 4 below shows the aspherical data, that is, the conical constant K and the values of the aspherical constants A4 to A10.
また、この変倍光学系ＺＬ１において、第１レンズ群Ｇ１と第２レンズ群Ｇ２との軸上空気間隔Ｄ５、第２レンズ群と第３レンズ群Ｇ３との軸上空気間隔Ｄ１１、第３レンズ群Ｇ３と第４レンズ群Ｇ４との軸上空気間隔Ｄ１３、第４レンズ群Ｇ４と第５レンズ群Ｇ５との軸上空気間隔Ｄ１９、第５レンズ群Ｇ５と第６レンズ群Ｇ６との軸上空気間隔Ｄ２２、及び、第６レンズ群Ｇ６と像面Ｉとの軸上空気間隔Ｄ２９（バックフォーカスＢＦに相当する）は、変倍及び合焦に際して変化する。次の表５に、無限遠物体合焦状態、並びに、至近合焦状態での可変間隔を示す。なお、この表５において、Ｉｎｆｉｎｉｔｅは無限遠合焦状態を示し、Ｃｌｏｓｅｓｔは至近合焦状態を示す。また、Ｗは広角端状態を、Ｍは中間焦点距離状態を、Ｔは望遠端状態を示す。また、Ｄ０は変倍光学系ＺＬ１の最も物体側の面（第１面）から物体までの距離を示し、βは撮影倍率を示し、ｆは全系の焦点距離を示す。 Further, in this variable magnification optical system ZL1, the axial air gap D5 between the first lens group G1 and the second lens group G2, the axial air gap D11 between the second lens group and the third lens group G3, and the third lens. On-axis air spacing D13 between group G3 and 4th lens group G4, on-axis air spacing D19 between 4th lens group G4 and 5th lens group G5, on-axis between 5th lens group G5 and 6th lens group G6 The air spacing D22 and the axial air spacing D29 (corresponding to the back focus BF) between the sixth lens group G6 and the image plane I change during scaling and focusing. Table 5 below shows the variable intervals in the infinity-focused state and the close-focused state. In Table 5, Infinite indicates an infinity-focused state, and Closest indicates a close-focused state. Further, W indicates a wide-angle end state, M indicates an intermediate focal length state, and T indicates a telephoto end state. Further, D0 indicates the distance from the surface (first surface) on the most object side of the variable magnification optical system ZL1 to the object, β indicates the photographing magnification, and f indicates the focal length of the entire system.
次の表６に、この変倍光学系ＺＬ１における各条件式対応値を示す。この条件式対応値において、ｆｆ１は第１合焦群Ｇｆ１の焦点距離を、ｆｆ２は第２合焦群Ｇｆ２の焦点距離を、ＦＺ１Ｗは広角端状態且つ無限遠合焦状態において第１合焦群Ｇｆ１が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］を、ＦＺ１Ｔは望遠端状態且つ無限遠合焦状態において第１合焦群Ｇｆ１が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］を、ＦＺ２Ｗは広角端状態且つ無限遠合焦状態において前記第２合焦群Ｇｆ２が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］を、ＦＺ２Ｔは望遠端状態且つ無限遠合焦状態において第２合焦群Ｇｆ２が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］を、νｄ１は第１合焦群Ｇｆ１に含まれるレンズの媒質のｄ線に対するアッベ数をそれぞれ表している。なお、この第１実施例において、第１合焦群Ｇｆ１は、物体側合焦群ＧｆＦである第３レンズ群Ｇ３が相当し、第２合焦群Ｇｆ２は、像側合焦群ＧｆＲである第５レンズ群Ｇ５が相当する。また、νｄ１は、第１合焦群Ｇｆ１である第３レンズ群Ｇ３の負メニスカスレンズＬ３１の値である。 Table 6 below shows the corresponding values of each conditional expression in this variable magnification optical system ZL1. In this conditional expression corresponding value, ff1 is the focal length of the first focusing group Gf1, ff2 is the focal length of the second focusing group Gf2, and FZ1W is the first focusing group in the wide-angle end state and the infinity focusing state. The amount of change in the on-axis focusing position [mm] when Gf1 moves 1 [mm] in the optical axis direction, FZ1T in the telephoto end state and infinity focusing state, and the first focusing group Gf1 in the optical axis direction. The amount of fluctuation [mm] of the on-axis focusing position when moved by 1 [mm] is the amount of change [mm] of the second focusing group Gf2 in the optical axis direction in the wide-angle end state and the infinity focusing state. The amount of change in the on-axis focusing position [mm] when the FZ2T is in the telescopic end state and in the infinity focusing state, the on-axis focusing when the second focusing group Gf2 moves by 1 [mm] in the optical axis direction. The amount of change in the focal length [mm] is represented by νd1 and the Abbe number of the lens included in the first focal length group Gf1 with respect to the d-line. In this first embodiment, the first focusing group Gf1 corresponds to the third lens group G3 which is the object-side focusing group GfF, and the second focusing group Gf2 is the image-side focusing group GfR. The fifth lens group G5 corresponds to this. Further, νd1 is a value of the negative meniscus lens L31 of the third lens group G3 which is the first focusing group Gf1.
このように、第１実施例に係る変倍光学系ＺＬ１は、上記条件式（１）〜（３）、（５）及び（３′）、（６）並びに（７）を満足している。 As described above, the variable magnification optical system ZL1 according to the first embodiment satisfies the above conditional expressions (1) to (3), (5) and (3'), (6) and (7).
この変倍光学系ＺＬ１の、無限遠合焦状態及び至近合焦状態における、広角端状態、中間焦点距離状態及び望遠端状態の球面収差図、非点収差図、歪曲収差図、倍率色収差図及び横収差図を図２及び図３に示す。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ナンバー又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、横収差図では各像高の値を示している。また、ｄはｄ線（λ＝５８７．６ｎｍ）、ｇはｇ線（λ＝４３５．８ｎｍ）をそれぞれ示す。また、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している。また、歪曲収差図はｄ線の値を示している。また、以降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。これらの各収差図より、この変倍光学系ＺＬ１は、合焦における無限遠物体合焦状態から至近合焦状態にわたって、また、変倍における広角端状態から望遠端状態にわたって諸収差が良好に補正されていることがわかる。 Spherical aberration diagram, astigmatism diagram, distortion diagram, chromatic aberration of magnification diagram and The transverse aberration diagram is shown in FIGS. 2 and 3. In each aberration diagram, FNO indicates F number, NA indicates numerical aperture, and Y indicates image height. The spherical aberration diagram shows the value of the F number or numerical aperture corresponding to the maximum aperture, the astigmatism diagram and the distortion diagram show the maximum image height, and the transverse aberration diagram shows the value of each image height. ing. Further, d indicates a d line (λ = 587.6 nm) and g indicates a 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. The distortion diagram shows the value on the d-line. Further, in the aberration diagram of each embodiment shown below, the same reference numerals as those of this embodiment are used. From each of these aberration diagrams, this variable magnification optical system ZL1 satisfactorily corrects various aberrations from the in-focus state to the close-focus state in focusing and from the wide-angle end state to the telephoto end state in focusing. You can see that it has been done.
［第２実施例］
図４は、第２実施例に係る変倍光学系ＺＬ２の構成を示す図である。この図４に示す変倍光学系ＺＬ２は、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、負の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４と、負の屈折力を有する第５レンズ群Ｇ５と、正の屈折力を有する第６レンズ群Ｇ６と、から構成されている。
[Second Example]
FIG. 4 is a diagram showing the configuration of the variable magnification optical system ZL2 according to the second embodiment. The variable magnification optical system ZL2 shown in FIG. 4 has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a second lens group having a negative refractive power in order from the object side. It is composed of three lens groups G3, 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. ..
この変倍光学系ＺＬ２において、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と両凸レンズＬ１２とを接合した接合正レンズ、及び、物体側に凸面を向けた正メニスカスレンズＬ１３を有して構成されている。また、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、物体側のレンズ面が非球面形状に形成された両凹レンズ形状の非球面負レンズＬ２２、及び、両凸レンズＬ２３を有して構成されている。また、第３レンズ群Ｇ３は、物体側から順に、両凹レンズＬ３１と両凸レンズＬ３２とを接合した接合負レンズを有して構成されている。また、第４レンズ群Ｇ４は、物体側から順に、物体側のレンズ面及び像側のレンズ面が非球面形状に形成された両凸レンズ形状の非球面正レンズＬ４１、及び、両凸レンズＬ４２と両凹レンズＬ４３とを接合した接合正レンズを有して構成されている。また、第５レンズ群Ｇ５は、物体側から順に、両凹レンズＬ５１と物体側に凸面を向けた正メニスカスレンズＬ５２とを接合した接合負レンズを有して構成されている。また、第６レンズ群Ｇ６は、物体側から順に、物体側のレンズ面が非球面形状に形成され、物体側に凹面を向けた正メニスカスレンズ形状の非球面正レンズＬ６１と物体側に凹面を向けた負メニスカスレンズＬ６２とを接合した接合正レンズ、両凸レンズＬ６３と物体側に凹面を向けた負メニスカスレンズＬ６４とを接合した接合正レンズ、物体側に凹面を向けた正メニスカスレンズＬ６５、及び、両凹レンズＬ６６を有して構成されている。また、開口絞りＳは、第４レンズ群Ｇ４の最も物体側のレンズ面（第１６面）の物体側に配置されている。 In this variable magnification optical system ZL2, the first lens group G1 has a bonded positive lens in which a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are joined in order from the object side, and a convex surface on the object side. It is configured to have a positive meniscus lens L13 directed toward it. Further, the second lens group G2 includes a negative meniscus lens L21 having a convex surface facing the object side, an aspherical negative lens L22 having a biconcave lens shape in which the lens surface on the object side is formed into an aspherical shape, and a negative lens L22 having a concave surface on the object side. , It is configured to have a biconvex lens L23. Further, the third lens group G3 is configured to have a bonded negative lens in which a biconcave lens L31 and a biconvex lens L32 are joined in order from the object side. Further, the fourth lens group G4 includes an aspherical positive lens L41 having a biconvex lens shape in which the lens surface on the object side and the lens surface on the image side are formed in an aspherical shape, and a biconvex lens L42 in order from the object side. It is configured to have a bonded positive lens bonded to the concave lens L43. Further, the fifth lens group G5 is configured to have a bonded negative lens in which a biconcave lens L51 and a positive meniscus lens L52 having a convex surface facing the object side are joined in order from the object side. Further, in the sixth lens group G6, the lens surface on the object side is formed in an aspherical shape in order from the object side, and the aspherical positive lens L61 having a positive meniscus lens shape with the concave surface facing the object side and the concave surface on the object side are formed. A bonded positive lens joined with a negative meniscus lens L62 facing, a bonded positive lens joined with a biconvex lens L63 and a negative meniscus lens L64 with a concave surface facing the object side, a positive meniscus lens L65 with a concave surface facing the object side, and , Both concave lenses L66 are included. Further, the aperture diaphragm S is arranged on the object side of the lens surface (16th surface) on the most object side of the fourth lens group G4.
この変倍光学系ＺＬ２では、広角端状態から望遠端状態への変倍に際し、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔が増大し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との空気間隔が減少し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との空気間隔が増大し、第５レンズ群Ｇ５と第６レンズ群Ｇ６との空気間隔が減少し、第６レンズ群Ｇ６と像面Ｉとの空気間隔が増大するように、第１レンズ群Ｇ１から第６レンズ群Ｇ６の各レンズ群が光軸上を移動する。なお、開口絞りＳは、変倍に際し第４レンズ群Ｇ４とともに移動する。 In this variable magnification optical system ZL2, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telescopic end state, and the second lens group G2 and the third lens group The air gap with G3 increases, the air gap between the third lens group G3 and the fourth lens group G4 decreases, the air gap between the fourth lens group G4 and the fifth lens group G5 increases, and the fifth lens Each lens group of the first lens group G1 to the sixth lens group G6 so that the air distance between the group G5 and the sixth lens group G6 decreases and the air distance between the sixth lens group G6 and the image plane I increases. Moves on the optical axis. The aperture stop S moves together with the fourth lens group G4 at the time of scaling.
また、この変倍光学系ＺＬ２では、物体側合焦群ＧｆＦを第３レンズ群Ｇ３とし、像側合焦群ＧｆＲを第５レンズ群Ｇ５とし、無限遠物体から近距離物体への合焦は、第１レンズ群Ｇ１、第２レンズ群Ｇ２、第４レンズ群Ｇ４及び第６レンズ群Ｇ６を像面Ｉに対して固定とし、物体側合焦群ＧｆＦである第３レンズ群Ｇ３を光軸に沿って像側から物体側に移動させ、像側合焦群ＧｆＲである第５レンズ群Ｇ５を光軸に沿って像側から物体側に移動させることにより行うように構成されている。なお、この合焦において、物体側合焦群ＧｆＦと像側合焦群ＧｆＲとの移動軌跡は異なるように構成されている。 Further, in this variable magnification optical system ZL2, the object-side focusing group GfF is set to the third lens group G3, the image-side focusing group GfR is set to the fifth lens group G5, and focusing from an infinity object to a short-range object is performed. , 1st lens group G1, 2nd lens group G2, 4th lens group G4 and 6th lens group G6 are fixed to the image plane I, and the 3rd lens group G3 which is the object side focusing group GfF is the optical axis. It is configured to move from the image side to the object side along the image side, and to move the fifth lens group G5, which is the image side focusing group GfR, from the image side to the object side along the optical axis. In this focusing, the movement loci of the object-side focusing group GfF and the image-side focusing group GfR are configured to be different.
以下に、第２実施例に係る変倍光学系ＺＬ２の諸元の値を掲げる。まず、表７に全体諸元を示す。 The values of the specifications of the variable magnification optical system ZL2 according to the second embodiment are listed below. First, Table 7 shows the overall specifications.
次に、表８に第２実施例におけるレンズデータを示す。 Next, Table 8 shows the lens data in the second embodiment.
また、表９に第２実施例におけるレンズ群焦点距離を示す。 Table 9 shows the focal length of the lens group in the second embodiment.
この変倍光学系ＺＬ２において、第８面、第１６面、第１７面及び第２４面は非球面形状に形成されている。次の表１０に、非球面のデータ、すなわち円錐定数Ｋ及び各非球面定数Ａ4〜Ａ10の値を示す。 In this variable magnification optical system ZL2, the 8th surface, the 16th surface, the 17th surface, and the 24th surface are formed in an aspherical shape. The following Table 10 shows the aspherical data, that is, the conical constant K and the values of the aspherical constants A4 to A10.
また、この変倍光学系ＺＬ２において、第１レンズ群Ｇ１と第２レンズ群Ｇ２との軸上空気間隔Ｄ５、第２レンズ群と第３レンズ群Ｇ３との軸上空気間隔Ｄ１１、第３レンズ群Ｇ３と第４レンズ群Ｇ４との軸上空気間隔Ｄ１４、第４レンズ群Ｇ４と第５レンズ群Ｇ５との軸上空気間隔Ｄ２０、第５レンズ群Ｇ５と第６レンズ群Ｇ６との軸上空気間隔Ｄ２３、及び、第６レンズ群Ｇ６と像面Ｉとの軸上空気間隔Ｄ３３（バックフォーカスＢＦに相当する）は、変倍及び合焦に際して変化する。次の表１１に、無限遠物体合焦状態、並びに、至近合焦状態での可変間隔を示す。 Further, in this variable magnification optical system ZL2, the axial air gap D5 between the first lens group G1 and the second lens group G2, the axial air gap D11 between the second lens group and the third lens group G3, and the third lens. On-axis air spacing D14 between group G3 and 4th lens group G4, on-axis air spacing D20 between 4th lens group G4 and 5th lens group G5, on-axis between 5th lens group G5 and 6th lens group G6 The air spacing D23 and the axial air spacing D33 (corresponding to the back focus BF) between the sixth lens group G6 and the image plane I change during scaling and focusing. Table 11 below shows the variable intervals in the infinity-focused state and the close-focused state.
次の表１２に、この変倍光学系ＺＬ２における各条件式対応値を示す。なお、この第２実施例において、第１合焦群Ｇｆ１は、物体側合焦群ＧｆＦである第３レンズ群Ｇ３が相当し、第２合焦群Ｇｆ２は、像側合焦群ＧｆＲである第５レンズ群Ｇ５が相当する。また、νｄ１は、第１合焦群Ｇｆ１である第３レンズ群Ｇ３の両凹レンズＬ３１の値である。 Table 12 below shows the corresponding values of each conditional expression in this variable magnification optical system ZL2. In this second embodiment, the first focusing group Gf1 corresponds to the third lens group G3 which is the object-side focusing group GfF, and the second focusing group Gf2 is the image-side focusing group GfR. The fifth lens group G5 corresponds to this. Further, νd1 is a value of the biconcave lens L31 of the third lens group G3 which is the first focusing group Gf1.
このように、第２実施例に係る変倍光学系ＺＬ２は、上記条件式（１）〜（３）、（５）及び（３′）、（６）並びに（７）を満足している。 As described above, the variable magnification optical system ZL2 according to the second embodiment satisfies the above conditional expressions (1) to (3), (5) and (3'), (6) and (7).
この変倍光学系ＺＬ２の、無限遠合焦状態及び至近合焦状態における、広角端状態、中間焦点距離状態及び望遠端状態の球面収差図、非点収差図、歪曲収差図、倍率色収差図及び横収差図を図５及び図６に示す。これらの各収差図より、この変倍光学系ＺＬ２は、合焦における無限遠物体合焦状態から至近合焦状態にわたって、また、変倍における広角端状態から望遠端状態にわたって諸収差が良好に補正されていることがわかる。 Spherical aberration diagram, astigmatism diagram, distortion diagram, chromatic aberration of magnification diagram and The transverse aberration diagram is shown in FIGS. 5 and 6. From each of these aberration diagrams, this variable magnification optical system ZL2 satisfactorily corrects various aberrations from the in-focus state to the close-focus state in focusing and from the wide-angle end state to the telephoto end state in focusing. You can see that it has been done.
［第３実施例］
図７は、第３実施例に係る変倍光学系ＺＬ３の構成を示す図である。この図７に示す変倍光学系ＺＬ３は、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５と、から構成されている。
[Third Example]
FIG. 7 is a diagram showing the configuration of the variable magnification optical system ZL3 according to the third embodiment. The variable magnification optical system ZL3 shown in FIG. 7 has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a second lens group having a positive refractive power in order from the object side. It is composed of three lens groups G3, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
この変倍光学系ＺＬ３において、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とを接合した接合正レンズを有して構成されている。また、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、物体側のレンズ面が非球面形状に形成され、物体側に凸面を向けた負メニスカスレンズ形状の非球面負レンズＬ２２、両凸レンズＬ２３、及び、像側のレンズ面が非球面形状に形成された両凹レンズ形状の非球面負レンズＬ２４を有して構成されている。また、第３レンズ群Ｇ３は、物体側から順に、物体側のレンズ面及び像側のレンズ面が非球面形状に形成された両凸レンズ形状の非球面正レンズＬ３１、両凸レンズＬ３２と物体側に凹面を向けた負メニスカスレンズＬ３３とを接合した接合正レンズ、両凹レンズＬ３４と物体側に凸面を向けた正メニスカスレンズＬ３５とを接合した接合正レンズ、及び、物体側のレンズ面及び像側のレンズ面が非球面形状に形成された両凸レンズ形状の非球面正レンズＬ３６を有して構成されている。また、第４レンズ群Ｇ４は、像側のレンズ面が非球面形状に形成され、物体側に凸面を向けた負メニスカスレンズ形状の非球面負レンズＬ４１を有して構成されている。また、第５レンズ群Ｇ５は、物体側のレンズ面が非球面形状に形成された両凸レンズ形状の非球面正レンズＬ５１を有して構成されている。また、開口絞りＳは、第３レンズ群Ｇ３の非球面正レンズＬ３１と両凸レンズＬ３２との間に配置されている。また、第５レンズ群Ｇ５と像面Ｉとの間にはフィルタＦＬが配置されている。 In this variable magnification optical system ZL3, the first lens group G1 is a bonded positive lens in which 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 are joined in order from the object side. It is configured to have. Further, the second lens group G2 has a negative meniscus lens L21 having a convex surface facing the object side in order from the object side, and a negative meniscus lens shape having an aspherical shape of the lens surface on the object side and the convex surface facing the object side. The aspherical negative lens L22, the biconvex lens L23, and the aspherical negative lens L24 having a biconcave lens shape in which the lens surface on the image side is formed into an aspherical shape are included. Further, the third lens group G3 includes a biconvex lens-shaped aspherical positive lens L31 and a biconvex lens L32 in which the lens surface on the object side and the lens surface on the image side are formed in an aspherical shape in order from the object side. A bonded positive lens in which a negative meniscus lens L33 with a concave surface is joined, a bonded positive lens in which both concave lenses L34 and a positive meniscus lens L35 with a convex surface facing the object side are joined, and a lens surface on the object side and an image side. It is configured to have an aspherical positive lens L36 having a biconvex lens shape in which the lens surface is formed into an aspherical shape. Further, the fourth lens group G4 is configured to have an aspherical negative lens L41 having a negative meniscus lens shape in which the lens surface on the image side is formed in an aspherical shape and the convex surface is directed toward the object side. Further, the fifth lens group G5 includes an aspherical positive lens L51 having a biconvex lens shape in which the lens surface on the object side is formed into an aspherical shape. Further, the aperture stop S is arranged between the aspherical positive lens L31 and the biconvex lens L32 of the third lens group G3. Further, a filter FL is arranged between the fifth lens group G5 and the image plane I.
この変倍光学系ＺＬ３では、広角端状態から望遠端状態への変倍に際し、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔が減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との空気間隔が増大し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との空気間隔が増大し、第５レンズ群Ｇ５とフィルタＦＬとの空気間隔が減少するように、第１レンズ群Ｇ１から第５レンズ群Ｇ５の各レンズ群が光軸上を移動する。なお、開口絞りＳは、変倍に際し第３レンズ群Ｇ３とともに移動する。 In this variable magnification optical system ZL3, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telescopic end state, and the second lens group G2 and the third lens group The air gap with G3 decreases, the air gap between the third lens group G3 and the fourth lens group G4 increases, the air gap between the fourth lens group G4 and the fifth lens group G5 increases, and the fifth lens Each lens group of the first lens group G1 to the fifth lens group G5 moves on the optical axis so that the air gap between the group G5 and the filter FL is reduced. The aperture stop S moves together with the third lens group G3 at the time of scaling.
また、この変倍光学系ＺＬ３では、物体側合焦群ＧｆＦを第２レンズ群Ｇ２とし、像側合焦群ＧｆＲを第４レンズ群Ｇ４とし、無限遠物体から近距離物体への合焦は、第１レンズ群Ｇ１、第３レンズ群Ｇ３及び第５レンズ群Ｇ５を像面Ｉに対して固定とし、物体側合焦群ＧｆＦである第２レンズ群Ｇ２を光軸に沿って像側から物体側に移動させ、像側合焦群ＧｆＲである第４レンズ群Ｇ４を光軸に沿って物体側から像側に移動させることにより行うように構成されている。なお、この合焦において、物体側合焦群ＧｆＦと像側合焦群ＧｆＲとの移動軌跡は異なるように構成されている。 Further, in this variable magnification optical system ZL3, the object-side focusing group GfF is set to the second lens group G2, the image-side focusing group GfR is set to the fourth lens group G4, and focusing from an infinity object to a short-range object is performed. The first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed to the image plane I, and the second lens group G2, which is the object-side focusing group GfF, is set from the image side along the optical axis. It is configured to move to the object side and move the fourth lens group G4, which is the image side focusing group GfR, from the object side to the image side along the optical axis. In this focusing, the movement loci of the object-side focusing group GfF and the image-side focusing group GfR are configured to be different.
以下に、第３実施例に係る変倍光学系ＺＬ３の諸元の値を掲げる。まず、表１３に全体諸元を示す。 The values of the specifications of the variable magnification optical system ZL3 according to the third embodiment are listed below. First, Table 13 shows the overall specifications.
次に、表１４に第３実施例におけるレンズデータを示す。 Next, Table 14 shows the lens data in the third embodiment.
また、表１５に第３実施例におけるレンズ群焦点距離を示す。 Table 15 shows the focal length of the lens group in the third embodiment.
この変倍光学系ＺＬ３において、第６面、第１１面、第１２面、第１３面、第２１面、第２２面、第２４面及び第２５面は非球面形状に形成されている。次の表１６に、非球面のデータ、すなわち円錐定数Ｋ及び各非球面定数Ａ4〜Ａ10の値を示す。 In this variable magnification optical system ZL3, the sixth surface, the eleventh surface, the twelfth surface, the thirteenth surface, the 21st surface, the 22nd surface, the 24th surface, and the 25th surface are formed in an aspherical shape. Table 16 below shows the aspherical data, that is, the conical constant K and the values of the aspherical constants A4 to A10.
また、この変倍光学系ＺＬ３において、第１レンズ群Ｇ１と第２レンズ群Ｇ２との軸上空気間隔Ｄ３、第２レンズ群と第３レンズ群Ｇ３との軸上空気間隔Ｄ１１、第３レンズ群Ｇ３と第４レンズ群Ｇ４との軸上空気間隔Ｄ２２、第４レンズ群Ｇ４と第５レンズ群Ｇ５との軸上空気間隔Ｄ２４、及び、第５レンズ群Ｇ５とフィルタＦＬＩとの軸上空気間隔Ｄ２６は、変倍及び合焦に際して変化する。次の表１７に、無限遠物体合焦状態、並びに、至近合焦状態での可変間隔を示す。 Further, in this variable magnification optical system ZL3, the axial air gap D3 between the first lens group G1 and the second lens group G2, the axial air gap D11 between the second lens group and the third lens group G3, and the third lens. The on-axis air gap D22 between the group G3 and the fourth lens group G4, the on-axis air gap D24 between the fourth lens group G4 and the fifth lens group G5, and the on-axis air between the fifth lens group G5 and the filter FLI. The interval D26 changes during scaling and focusing. Table 17 below shows the variable intervals in the infinity-focused state and the close-focused state.
次の表１８に、この変倍光学系ＺＬ３における各条件式対応値を示す。なお、この第３実施例において、第１合焦群Ｇｆ１は、物体側合焦群ＧｆＦである第２レンズ群Ｇ２が相当し、第２合焦群Ｇｆ２は、像側合焦群ＧｆＲである第４レンズ群Ｇ４が相当する。また、νｄ１は、第１合焦群Ｇｆ１である第２レンズ群Ｇ２の負メニスカスレンズＬ２１の値である。 Table 18 below shows the corresponding values of each conditional expression in this variable magnification optical system ZL3. In this third embodiment, the first focusing group Gf1 corresponds to the second lens group G2 which is the object-side focusing group GfF, and the second focusing group Gf2 is the image-side focusing group GfR. The fourth lens group G4 corresponds to this. Further, νd1 is a value of the negative meniscus lens L21 of the second lens group G2 which is the first focusing group Gf1.
このように、第３実施例に係る変倍光学系ＺＬ３は、上記条件式（１）〜（３）、（５）及び（３′）、（６）並びに（７）を満足している。 As described above, the variable magnification optical system ZL3 according to the third embodiment satisfies the above conditional expressions (1) to (3), (5) and (3'), (6) and (7).
この変倍光学系ＺＬ３の、無限遠合焦状態及び至近合焦状態における、広角端状態、中間焦点距離状態及び望遠端状態の球面収差図、非点収差図、歪曲収差図、倍率色収差図及び横収差図を図８及び図９に示す。これらの各収差図より、この変倍光学系ＺＬ３は、合焦における無限遠物体合焦状態から至近合焦状態にわたって、また、変倍における広角端状態から望遠端状態にわたって諸収差が良好に補正されていることがわかる。 Spherical aberration diagram, astigmatism diagram, distortion diagram, chromatic aberration of magnification diagram and The transverse aberration diagram is shown in FIGS. 8 and 9. From each of these aberration diagrams, this variable magnification optical system ZL3 satisfactorily corrects various aberrations from the in-focus state to the close-focus state in focusing and from the wide-angle end state to the telephoto end state in focusing. You can see that it has been done.
［第４実施例］
図１０は、第４実施例に係る変倍光学系ＺＬ４の構成を示す図である。この図１０に示す変倍光学系ＺＬ４は、物体側から順に、負の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、負の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５と、から構成されている。
[Fourth Example]
FIG. 10 is a diagram showing the configuration of the variable magnification optical system ZL4 according to the fourth embodiment. The variable magnification optical system ZL4 shown in FIG. 10 has a first lens group G1 having a negative refractive power, a second lens group G2 having a negative refractive power, and a second lens group having a positive refractive power in order from the object side. It is composed of three lens groups G3, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
この変倍光学系ＺＬ４において、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、物体側のレンズ面が非球面形状に形成され、物体側に凸面を向けた負メニスカスレンズ形状の非球面負レンズＬ１２、及び、両凸レンズＬ１３を有して構成されている。また、第２レンズ群Ｇ２は、物体側から順に、物体側のレンズ面が非球面形状に形成され、物体側に凹面を向けた負メニスカスレンズ形状の非球面負レンズＬ２１と物体側に凹面を向けた正メニスカスレンズＬ２２とを接合した接合負レンズを有して構成されている。また、第３レンズ群Ｇ３は、物体側から順に、物体側のレンズ面及び像側のレンズ面が非球面形状に形成され、物体側に凸面を向けた正メニスカスレンズ形状の非球面正レンズＬ３１、及び、両凸レンズＬ３２と両凹レンズＬ３３とを接合した接合正レンズを有して構成されている。また、第４レンズ群Ｇ４は、物体側から順に、両凹レンズＬ４１と物体側に凸面を向けた正メニスカスレンズＬ４２とを接合した接合負レンズを有して構成されている。また、第５レンズ群Ｇ５は、物体側のレンズ面が非球面形状に形成され、物体側に凸面を向けた負メニスカスレンズ形状の非球面負レンズＬ５１と物体側に凸面を向けた正メニスカスレンズＬ５２とを接合した接合負レンズ、両凸レンズＬ５３と物体側に凹面を向けた負メニスカスレンズＬ５４とを接合した接合正レンズ、両凸レンズＬ５５、及び、両凹レンズＬ５６を有して構成されている。また、開口絞りＳは、第３レンズ群Ｇ３の最も物体側のレンズ面（第１１面）の物体側に配置されている。 In this variable magnification optical system ZL4, the first lens group G1 is a negative meniscus lens L11 having a convex surface facing the object side in order from the object side, and the lens surface on the object side is formed into an aspherical shape, and the convex surface is formed on the object side. It is configured to have an aspherical negative lens L12 having a negative meniscus lens shape and a biconvex lens L13. Further, in the second lens group G2, the lens surface on the object side is formed in an aspherical shape in order from the object side, and the negative meniscus lens-shaped aspherical negative lens L21 with the concave surface facing the object side and the concave surface on the object side are formed. It is configured to have a bonded negative lens bonded to a positive meniscus lens L22 to be directed. Further, in the third lens group G3, the lens surface on the object side and the lens surface on the image side are formed in an aspherical shape in order from the object side, and the aspherical positive lens L31 having a positive meniscus lens shape with the convex surface facing the object side. And, it is configured to have a bonded positive lens in which a biconvex lens L32 and a biconcave lens L33 are joined. Further, the fourth lens group G4 is configured to have a bonded negative lens in which a biconcave lens L41 and a positive meniscus lens L42 having a convex surface facing the object side are joined in order from the object side. Further, in the fifth lens group G5, the lens surface on the object side is formed in an aspherical shape, and the negative meniscus lens-shaped aspherical negative lens L51 with the convex surface facing the object side and the positive meniscus lens with the convex surface facing the object side. It includes a bonded negative lens bonded to L52, a bonded positive lens bonded to a biconvex lens L53 and a negative meniscus lens L54 having a concave surface facing the object side, a biconvex lens L55, and a biconcave lens L56. Further, the aperture diaphragm S is arranged on the object side of the lens surface (11th surface) on the most object side of the third lens group G3.
この変倍光学系ＺＬ４では、広角端状態から望遠端状態への変倍に際し、第１レンズ群Ｇ１と第２レンズ群Ｇ２の空気間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の空気間隔が減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の空気間隔が増大し、第４レンズ群Ｇ４と第５レンズ群Ｇ５の空気間隔が減少し、第５レンズ群Ｇ５と像面Ｉの空気間隔が増大するように、第１レンズ群Ｇ１から第５レンズ群Ｇ５の各レンズ群が光軸上を移動する。なお、開口絞りＳは、変倍に際し第３レンズ群Ｇ３とともに移動する。 In this variable magnification optical system ZL4, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telescopic end state, and the second lens group G2 and the third lens group G3 The air spacing between the 3rd lens group G3 and the 4th lens group G4 increases, the air spacing between the 4th lens group G4 and the 5th lens group G5 decreases, and the image with the 5th lens group G5. Each lens group of the first lens group G1 to the fifth lens group G5 moves on the optical axis so that the air spacing of the surface I increases. The aperture stop S moves together with the third lens group G3 at the time of scaling.
また、この変倍光学系ＺＬ４では、物体側合焦群ＧｆＦを第２レンズ群Ｇ２とし、像側合焦群ＧｆＲを第４レンズ群Ｇ４とし、無限遠物体から近距離物体への合焦は、第１レンズ群Ｇ１、第３レンズ群Ｇ３及び第５レンズ群Ｇ５を像面Ｉに対して固定とし、物体側合焦群ＧｆＦである第２レンズ群Ｇ２を光軸に沿って像側から物体側に移動させ、像側合焦群ＧｆＲである第４レンズ群Ｇ４を光軸に沿って像側から物体側に移動させることにより行うように構成されている。なお、この合焦において、物体側合焦群ＧｆＦと像側合焦群ＧｆＲとの移動軌跡は異なるように構成されている。 Further, in this variable magnification optical system ZL4, the object-side focusing group GfF is set to the second lens group G2, the image-side focusing group GfR is set to the fourth lens group G4, and focusing from an infinity object to a short-range object is performed. The first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed to the image plane I, and the second lens group G2, which is the object-side focusing group GfF, is set from the image side along the optical axis. It is configured to move to the object side and move the fourth lens group G4, which is the image side focusing group GfR, from the image side to the object side along the optical axis. In this focusing, the movement loci of the object-side focusing group GfF and the image-side focusing group GfR are configured to be different.
以下に、第４実施例に係る変倍光学系ＺＬ４の諸元の値を掲げる。まず、表１９に全体諸元を示す。 The values of the specifications of the variable magnification optical system ZL4 according to the fourth embodiment are listed below. First, Table 19 shows the overall specifications.
次に、表２０に第４実施例におけるレンズデータを示す。 Next, Table 20 shows the lens data in the fourth embodiment.
また、表２１に第４実施例におけるレンズ群焦点距離を示す。 Table 21 shows the focal lengths of the lens groups in the fourth embodiment.
この変倍光学系ＺＬ４において、第３面、第７面、第１１面、第１２面、及び第１９面は非球面形状に形成されている。次の表２２に、非球面のデータ、すなわち円錐定数Ｋ及び各非球面定数Ａ4〜Ａ10の値を示す。 In this variable magnification optical system ZL4, the third surface, the seventh surface, the eleventh surface, the twelfth surface, and the nineteenth surface are formed in an aspherical shape. Table 22 below shows the aspherical data, that is, the conical constant K and the values of the aspherical constants A4 to A10.
また、この変倍光学系ＺＬ４において、第１レンズ群Ｇ１と第２レンズ群Ｇ２との軸上空気間隔Ｄ６、第２レンズ群と第３レンズ群Ｇ３との軸上空気間隔Ｄ９、第３レンズ群Ｇ３と第４レンズ群Ｇ４との軸上空気間隔Ｄ１５、第４レンズ群Ｇ４と第５レンズ群Ｇ５との軸上空気間隔Ｄ１８、及び、第５レンズ群Ｇ５と像面Ｉとの軸上空気間隔Ｄ２８（バックフォーカスＢＦに相当する）は、変倍及び合焦に際して変化する。次の表２３に、無限遠物体合焦状態、並びに、至近合焦状態での可変間隔を示す。 Further, in this variable magnification optical system ZL4, the axial air gap D6 between the first lens group G1 and the second lens group G2, the axial air gap D9 between the second lens group and the third lens group G3, and the third lens. On-axis air spacing D15 between group G3 and 4th lens group G4, on-axis air spacing D18 between 4th lens group G4 and 5th lens group G5, and on-axis between 5th lens group G5 and image plane I The air spacing D28 (corresponding to the back focus BF) changes during scaling and focusing. Table 23 below shows the variable intervals in the infinity-focused state and the close-focused state.
次の表２４に、この変倍光学系ＺＬ４における各条件式対応値を示す。なお、この第４実施例において、第１合焦群Ｇｆ１は、物体側合焦群ＧｆＦである第２レンズ群Ｇ２が相当し、第２合焦群Ｇｆ２は、像側合焦群ＧｆＲである第４レンズ群Ｇ４が相当する。また、νｄ１は、第１合焦群Ｇｆ１である第２レンズ群Ｇ２の非球面負レンズＬ２１の値である。 Table 24 below shows the corresponding values of each conditional expression in this variable magnification optical system ZL4. In this fourth embodiment, the first focusing group Gf1 corresponds to the second lens group G2 which is the object-side focusing group GfF, and the second focusing group Gf2 is the image-side focusing group GfR. The fourth lens group G4 corresponds to this. Further, νd1 is a value of the aspherical negative lens L21 of the second lens group G2 which is the first focusing group Gf1.
このように、第４実施例に係る変倍光学系ＺＬ４は、上記条件式（１）〜（３）、（５）及び（３′）、（６）並びに（７）を満足している。 As described above, the variable magnification optical system ZL4 according to the fourth embodiment satisfies the above conditional expressions (1) to (3), (5) and (3'), (6) and (7).
この変倍光学系ＺＬ４の、無限遠合焦状態及び至近合焦状態における、広角端状態、中間焦点距離状態及び望遠端状態の球面収差図、非点収差図、歪曲収差図、倍率色収差図及び横収差図を図１１及び図１２に示す。これらの各収差図より、この変倍光学系ＺＬ４は、合焦における無限遠物体合焦状態から至近合焦状態にわたって、また、変倍における広角端状態から望遠端状態にわたって諸収差が良好に補正されていることがわかる。 Spherical aberration diagram, astigmatism diagram, distortion diagram, chromatic aberration of magnification diagram and The transverse aberration diagram is shown in FIGS. 11 and 12. From each of these aberration diagrams, this variable magnification optical system ZL4 satisfactorily corrects various aberrations from the in-focus state to the close-focus state in focusing, and from the wide-angle end state to the telephoto end state in focusing. You can see that it has been done.
［第５実施例］
図１３は、第５実施例に係る変倍光学系ＺＬ５の構成を示す図である。この図１３に示す変倍光学系ＺＬ５は、物体側から順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、負の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４と、正の屈折力を有する第５レンズ群Ｇ５と、負の屈折力を有する第６レンズ群Ｇ６と、負の屈折力を有する第７レンズ群Ｇ７と、から構成されている。
[Fifth Example]
FIG. 13 is a diagram showing the configuration of the variable magnification optical system ZL5 according to the fifth embodiment. The variable magnification optical system ZL5 shown in FIG. 13 has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a second lens group having a negative refractive power in order from the object side. The 3 lens group G3, the 4th lens group G4 having a positive refractive power, the 5th lens group G5 having a positive refractive power, the 6th lens group G6 having a negative refractive power, and the negative refractive power. It is composed of a seventh lens group G7 having a lens.
この変倍光学系ＺＬ５において、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と両凸レンズＬ１２とを接合した接合正レンズ、及び、物体側に凸面を向けた正メニスカスレンズＬ１３を有して構成されている。また、第２レンズ群Ｇ２は、物体側から順に、両凸レンズＬ２１と両凹レンズＬ２２とを接合した接合正レンズ、及び、両凹レンズＬ２３と物体側に凸面を向けた正メニスカスレンズＬ２４とを接合した接合負レンズを有して構成されている。また、第３レンズ群Ｇ３は、物体側に凹面を向けた負メニスカスレンズＬ３１を有して構成されている。また、第４レンズ群Ｇ４は、物体側から順に、両凸レンズＬ４１、両凹レンズＬ４２と両凸レンズＬ４３とを接合した接合正レンズ、及び、物体側に凹面を向けた正メニスカスレンズＬ４４と物体側に凹面を向けた負メニスカスレンズＬ４５とを接合した接合負レンズを有して構成されている。また、第５レンズ群Ｇ５は、物体側から順に、両凸レンズＬ５１と両凹レンズＬ５２とを接合した接合負レンズ、並びに、物体側のレンズ面及び像側のレンズ面が非球面形状に形成された両凸レンズ形状の非球面正レンズＬ５３を有して構成されている。また、第６レンズ群Ｇ６は、物体側から順に、物体側のレンズ面が非球面形状に形成され、物体側に凸面を向けた負メニスカスレンズ形状の非球面負レンズＬ６１と物体側に凸面を向けた正メニスカスレンズＬ６２とを接合した接合負レンズ、及び、両凸レンズＬ６３を有して構成されている。また、第７レンズ群Ｇ７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Ｌ７１と物体側に凸面を向けた負メニスカスレンズＬ７２とを接合した接合負レンズを有して構成されている。また、開口絞りＳは、第４レンズ群Ｇ４の最も物体側のレンズ面（第１５面）の物体側に配置されている。また、第７レンズ群Ｇ７と像面Ｉとの間にはフィルタＦＬが配置されている。 In this variable magnification optical system ZL5, the first lens group G1 has a bonded positive lens in which a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are joined in order from the object side, and a convex surface on the object side. It is configured to have a positive meniscus lens L13 directed toward it. Further, in the second lens group G2, a bonded positive lens in which a biconvex lens L21 and a biconcave lens L22 are joined, and a biconcave lens L23 and a positive meniscus lens L24 having a convex surface facing the object side are joined in order from the object side. It is configured to have a junction negative lens. Further, the third lens group G3 is configured to have a negative meniscus lens L31 with a concave surface facing the object side. Further, the fourth lens group G4 is, in order from the object side, a biconvex lens L41, a bonded positive lens in which a biconcave lens L42 and a biconvex lens L43 are joined, and a positive meniscus lens L44 with a concave surface facing the object side and the object side. It is configured to have a bonded negative lens bonded to a negative meniscus lens L45 with a concave surface facing. Further, in the fifth lens group G5, a bonded negative lens in which a biconvex lens L51 and a biconcave lens L52 are joined, and a lens surface on the object side and a lens surface on the image side are formed in an aspherical shape in order from the object side. It is configured to have an aspherical positive lens L53 having a biconvex lens shape. Further, in the sixth lens group G6, the lens surface on the object side is formed in an aspherical shape in order from the object side, and the aspherical negative lens L61 having a negative meniscus lens shape with the convex surface facing the object side and the convex surface on the object side are formed. It is configured to have a bonded negative lens bonded to a positive meniscus lens L62 and a biconvex lens L63. Further, the seventh lens group G7 is configured to have a bonded negative lens in which a positive meniscus lens L71 having a convex surface facing the object side and a negative meniscus lens L72 having a convex surface facing the object side are joined in order from the object side. ing. Further, the aperture diaphragm S is arranged on the object side of the lens surface (15th surface) on the most object side of the fourth lens group G4. Further, a filter FL is arranged between the 7th lens group G7 and the image plane I.
この変倍光学系ＺＬ５では、広角端状態から望遠端状態への変倍に際し、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔が減少し、第３レンズ群Ｇ３と第４レンズ群Ｇ４との空気間隔が減少し、第４レンズ群Ｇ４と第５レンズ群Ｇ５との空気間隔が変化し、第５レンズ群Ｇ５と第６レンズ群Ｇ６との空気間隔が変化し、第６レンズ群Ｇ６と第７レンズ群Ｇ７との空気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の各レンズ群が光軸上を移動する。このとき、第７レンズ群Ｇ７は像面Ｉに対して固定されている。なお、開口絞りＳは、変倍に際し第４レンズ群Ｇ４とともに移動する。 In this variable magnification optical system ZL5, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telescopic end state, and the second lens group G2 and the third lens group The air gap between the third lens group G3 and the fourth lens group G4 decreases, the air distance between the fourth lens group G4 and the fifth lens group G5 changes, and the fifth lens Each of the first lens group G1 to the sixth lens group G6 changes so that the air distance between the group G5 and the sixth lens group G6 changes and the air distance between the sixth lens group G6 and the seventh lens group G7 changes. The lens group moves on the optical axis. At this time, the seventh lens group G7 is fixed with respect to the image plane I. The aperture stop S moves together with the fourth lens group G4 at the time of scaling.
また、この変倍光学系ＺＬ５では、物体側合焦群ＧｆＦを第３レンズ群Ｇ３とし、像側合焦群ＧｆＲを第５レンズ群Ｇ５とし、無限遠物体から近距離物体への合焦は、第１レンズ群Ｇ１、第２レンズ群Ｇ２、第４レンズ群Ｇ４、第６レンズ群Ｇ６及び第７レンズ群Ｇ７を像面Ｉに対して固定とし、物体側合焦群ＧｆＦである第３レンズ群Ｇ３を光軸に沿って像側から物体側に移動させ、像側合焦群ＧｆＲである第５レンズ群Ｇ５を光軸に沿って像側から物体側に移動させることにより行うように構成されている。なお、この合焦において、物体側合焦群ＧｆＦと像側合焦群ＧｆＲとの移動軌跡は異なるように構成されている。 Further, in this variable magnification optical system ZL5, the object-side focusing group GfF is set to the third lens group G3, the image-side focusing group GfR is set to the fifth lens group G5, and focusing from an infinity object to a short-range object is performed. , The first lens group G1, the second lens group G2, the fourth lens group G4, the sixth lens group G6, and the seventh lens group G7 are fixed with respect to the image plane I, and the third lens group is the object-side focusing group GfF. The lens group G3 is moved from the image side to the object side along the optical axis, and the fifth lens group G5, which is the image side focusing group GfR, is moved from the image side to the object side along the optical axis. It is configured. In this focusing, the movement loci of the object-side focusing group GfF and the image-side focusing group GfR are configured to be different.
以下に、第５実施例に係る変倍光学系ＺＬ５の諸元の値を掲げる。まず、表２５に全体諸元を示す。 The values of the specifications of the variable magnification optical system ZL5 according to the fifth embodiment are listed below. First, Table 25 shows the overall specifications.
次に、表２６に第５実施例におけるレンズデータを示す。 Next, Table 26 shows the lens data in the fifth embodiment.
また、表２７に第５実施例におけるレンズ群焦点距離を示す。 Table 27 shows the focal length of the lens group in the fifth embodiment.
この変倍光学系ＺＬ５において、第２６面、第２７面及び第２８面は非球面形状に形成されている。次の表２８に、非球面のデータ、すなわち円錐定数Ｋ及び各非球面定数Ａ4〜Ａ10の値を示す。 In this variable magnification optical system ZL5, the 26th surface, the 27th surface, and the 28th surface are formed in an aspherical shape. Table 28 below shows the aspherical data, that is, the conical constant K and the values of the aspherical constants A4 to A10.
また、この変倍光学系ＺＬ５において、第１レンズ群Ｇ１と第２レンズ群Ｇ２との軸上空気間隔Ｄ５、第２レンズ群と第３レンズ群Ｇ３との軸上空気間隔Ｄ１１、第３レンズ群Ｇ３と第４レンズ群Ｇ４との軸上空気間隔Ｄ１３、第４レンズ群Ｇ４と第５レンズ群Ｇ５との軸上空気間隔Ｄ２２、第５レンズ群Ｇ５と第６レンズ群Ｇ６との軸上空気間隔２７、及び、第６レンズ群Ｇ６と第７レンズ群Ｇ７との軸上空気間隔Ｄ３２は、変倍及び合焦に際して変化する。次の表２９に、無限遠物体合焦状態、並びに、至近合焦状態での可変間隔を示す。
Further, in this variable magnification optical system ZL5, the axial air gap D5 between the first lens group G1 and the second lens group G2, the axial air gap D11 between the second lens group and the third lens group G3, and the third lens. On-axis air spacing D13 between group G3 and 4th lens group G4, on-axis air spacing D22 between 4th lens group G4 and 5th lens group G5, on-axis between 5th lens group G5 and 6th lens group G6 The
次の表３０に、この変倍光学系ＺＬ５における各条件式対応値を示す。なお、この第５実施例において、第１合焦群Ｇｆ１は、像側合焦群ＧｆＲである第５レンズ群Ｇ５が相当し、第２合焦群Ｇｆ２は、物体側合焦群ＧｆＦである第３レンズ群Ｇ３が相当する。また、νｄ１は、第１合焦群Ｇｆ１である第５レンズ群Ｇ５の非球面正レンズＬ５３の値である。 The following Table 30 shows the corresponding values of each conditional expression in this variable magnification optical system ZL5. In this fifth embodiment, the first focusing group Gf1 corresponds to the fifth lens group G5 which is the image side focusing group GfR, and the second focusing group Gf2 is the object side focusing group GfF. The third lens group G3 corresponds to this. Further, νd1 is a value of the aspherical positive lens L53 of the fifth lens group G5, which is the first focusing group Gf1.
このように、第５実施例に係る変倍光学系ＺＬ５は、上記条件式（１）、（２）、（４）〜（７）を満足している。 As described above, the variable magnification optical system ZL5 according to the fifth embodiment satisfies the above conditional expressions (1), (2), (4) to (7).
この変倍光学系ＺＬ５の、無限遠合焦状態及び至近合焦状態における、広角端状態、中間焦点距離状態及び望遠端状態の球面収差図、非点収差図、歪曲収差図、倍率色収差図及び横収差図を図１４及び図１５に示す。これらの各収差図より、この変倍光学系ＺＬ５は、合焦における無限遠物体合焦状態から至近合焦状態にわたって、また、変倍における広角端状態から望遠端状態にわたって諸収差が良好に補正されていることがわかる。 Spherical aberration diagram, astigmatism diagram, distortion diagram, chromatic aberration of magnification diagram and The transverse aberration diagram is shown in FIGS. 14 and 15. From each of these aberration diagrams, this variable magnification optical system ZL5 satisfactorily corrects various aberrations from the in-focus state to the close-focus state in focusing and from the wide-angle end state to the telephoto end state in focusing. You can see that it has been done.
１ カメラ（光学機器） ＺＬ（ＺＬ１〜ＺＬ５） 変倍光学系
ＧｆＦ 物体側合焦群 Ｓ 開口絞り ＧｆＲ 像側合焦群
Ｇｆ１ 第１合焦群 Ｇｆ２ 第２合焦群
1 Camera (optical equipment) ZL (ZL1 to ZL5) Variable magnification optical system GfF Object side focusing group S Aperture aperture GfR Image side focusing group Gf1 First focusing group Gf2 Second focusing group
Claims (16)
開口絞りと、
前記開口絞りより物体側に配置され、合焦時に光軸方向に移動する少なくとも１つの物体側合焦群と、
前記開口絞りより像側に配置され、合焦時に光軸方向に移動する少なくとも１つの像側合焦群と、を有し、
合焦時に、前記物体側合焦群と前記像側合焦群との移動軌跡は異なり、
前記物体側合焦群より物体側に、少なくとも１つの物体側レンズ群を有し、
変倍時に、前記物体側レンズ群と前記物体側合焦群との間隔が変化し、
前記物体側合焦群の１つ及び前記像側合焦群の１つのうち、一方を第１合焦群とし、他方を第２合焦群としたとき、次式の条件を満足することを特徴とする変倍光学系。
｜ｆｆ１／ｆｆ２｜ ＜ １．０００
０．０１０ ＜ ｜ＦＺ２Ｔ／ＦＺ１Ｔ｜ ＜ １．０００
０．０５０ ＜ ｜ＦＺ２Ｗ／ＦＺ２Ｔ｜ ＜ ０．９５０
ｆｆ２ ≦ −３４．４７
但し、
ｆｆ１：前記第１合焦群の焦点距離
ｆｆ２：前記第２合焦群の焦点距離
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において前記第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｗ：広角端状態且つ無限遠合焦状態において前記第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｔ：望遠端状態且つ無限遠合焦状態において前記第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ A variable magnification optical system having a plurality of lens groups and changing the distance between the lens groups at the time of magnification change.
Aperture aperture and
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction at the time of focusing.
It has at least one image-side focusing group, which is arranged on the image side of the aperture stop and moves in the optical axis direction at the time of focusing.
At the time of focusing, the movement loci of the object-side focusing group and the image-side focusing group are different.
It has at least one object-side lens group on the object side of the object-side in-focus group.
At the time of scaling, the distance between the object-side lens group and the object-side focusing group changes,
When one of the object-side focusing group and one of the image-side focusing groups is defined as the first focusing group and the other as the second focusing group, the condition of the following equation is satisfied. Characterized variable magnification optical system.
｜ ff1 / ff2 ｜ <1,000
0.010 << | FZ2T / FZ1T | <1,000
0.050 << | FZ2W / FZ2T | <0.950
ff2 ≤ −34.47
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group FZ1T: The first focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. Amount of fluctuation in the on-axis focal length [mm]
FZ2W: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the wide-angle end state and the infinity focusing state.
FZ2T: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
開口絞りと、
前記開口絞りより物体側に配置され、合焦時に光軸方向に移動する少なくとも１つの物体側合焦群と、
前記開口絞りより像側に配置され、合焦時に光軸方向に移動する少なくとも１つの像側合焦群と、を有し、
合焦時に、前記物体側合焦群と前記像側合焦群との移動軌跡は異なり、
前記物体側合焦群の１つは、物体側に凹面を向けた負レンズからなり、
前記物体側合焦群の１つ及び前記像側合焦群の１つのうち、一方を第１合焦群とし、他方を第２合焦群としたとき、次式の条件を満足することを特徴とする変倍光学系。
｜ｆｆ１／ｆｆ２｜ ＜ １．０００
０．０１０ ＜ ｜ＦＺ２Ｔ／ＦＺ１Ｔ｜ ＜ １．０００
０．０５０ ＜ ｜ＦＺ２Ｗ／ＦＺ２Ｔ｜ ＜ ０．９５０
ｆｆ２ ≦ −３４．４７
但し、
ｆｆ１：前記第１合焦群の焦点距離
ｆｆ２：前記第２合焦群の焦点距離
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において前記第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｗ：広角端状態且つ無限遠合焦状態において前記第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｔ：望遠端状態且つ無限遠合焦状態において前記第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ A variable magnification optical system having a plurality of lens groups and changing the distance between the lens groups at the time of magnification change.
Aperture aperture and
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction at the time of focusing.
It has at least one image-side focusing group, which is arranged on the image side of the aperture stop and moves in the optical axis direction at the time of focusing.
At the time of focusing, the movement loci of the object-side focusing group and the image-side focusing group are different.
One of the object-side focusing groups consists of a negative lens with a concave surface facing the object side.
When one of the object-side focusing group and one of the image-side focusing groups is defined as the first focusing group and the other as the second focusing group, the condition of the following equation is satisfied. Characterized variable magnification optical system.
｜ ff1 / ff2 ｜ <1,000
0.010 << | FZ2T / FZ1T | <1,000
0.050 << | FZ2W / FZ2T | <0.950
ff2 ≤ −34.47
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group FZ1T: The first focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. Amount of fluctuation in the on-axis focal length [mm]
FZ2W: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the wide-angle end state and the infinity focusing state.
FZ2T: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
開口絞りと、
前記開口絞りより物体側に配置され、合焦時に光軸方向に移動する少なくとも１つの物体側合焦群と、
前記開口絞りより像側に配置され、合焦時に光軸方向に移動する少なくとも１つの像側合焦群と、を有し、
合焦時に、前記物体側合焦群と前記像側合焦群との移動軌跡は異なり、
前記物体側合焦群の１つ及び前記像側合焦群の１つのうち、一方を第１合焦群とし、他方を第２合焦群としたとき、次式の条件を満足することを特徴とする変倍光学系。
｜ｆｆ１／ｆｆ２｜ ＜ １．０００
０．０１０ ＜ ｜ＦＺ２Ｔ／ＦＺ１Ｔ｜ ＜ １．０００
０．６００ ＜ ｜ＦＺ２Ｗ／ＦＺ２Ｔ｜ ＜ ０．９５０
ｆｆ２ ≦ −３４．４７
但し、
ｆｆ１：前記第１合焦群の焦点距離
ｆｆ２：前記第２合焦群の焦点距離
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において前記第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｗ：広角端状態且つ無限遠合焦状態において前記第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ２Ｔ：望遠端状態且つ無限遠合焦状態において前記第２合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ A variable magnification optical system having a plurality of lens groups and changing the distance between the lens groups at the time of magnification change.
Aperture aperture and
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction at the time of focusing.
It has at least one image-side focusing group, which is arranged on the image side of the aperture stop and moves in the optical axis direction at the time of focusing.
At the time of focusing, the movement loci of the object-side focusing group and the image-side focusing group are different.
When one of the object-side focusing group and one of the image-side focusing groups is defined as the first focusing group and the other as the second focusing group, the condition of the following equation is satisfied. Characterized variable magnification optical system.
｜ ff1 / ff2 ｜ <1,000
0.010 << | FZ2T / FZ1T | <1,000
0.600 << | FZ2W / FZ2T | <0.950
ff2 ≤ −34.47
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group FZ1T: The first focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. Amount of fluctuation in the on-axis focal length [mm]
FZ2W: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the wide-angle end state and the infinity focusing state.
FZ2T: Fluctuation amount [mm] of the on-axis focusing position when the second focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
開口絞りと、
前記開口絞りより物体側に配置され、合焦時に光軸方向に移動する少なくとも１つの物体側合焦群と、
前記開口絞りより像側に配置され、合焦時に光軸方向に移動する少なくとも１つの像側合焦群と、を有し、
合焦時に、前記物体側合焦群と前記像側合焦群との移動軌跡は異なり、
前記像側合焦群の１つを第１合焦群とし、前記物体側合焦群の１つを第２合焦群としたとき、次式の条件を満足することを特徴とする変倍光学系。
｜ｆｆ１／ｆｆ２｜ ＜ １．０００
ｆｆ１ ＞ ０
０．０１０ ＜ ｜ＦＺ１Ｗ／ＦＺ１Ｔ｜ ＜ ０．３５０
但し、
ｆｆ１：前記第１合焦群の焦点距離
ｆｆ２：前記第２合焦群の焦点距離
ＦＺ１Ｗ：広角端状態且つ無限遠合焦状態において前記第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において前記第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ A variable magnification optical system having a plurality of lens groups and changing the distance between the lens groups at the time of magnification change.
Aperture aperture and
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction at the time of focusing.
It has at least one image-side focusing group, which is arranged on the image side of the aperture stop and moves in the optical axis direction at the time of focusing.
At the time of focusing, the movement loci of the object-side focusing group and the image-side focusing group are different.
When one of the image-side focusing groups is the first focusing group and one of the object-side focusing groups is the second focusing group, the scaling factor is characterized by satisfying the condition of the following equation. Optical system.
｜ ff1 / ff2 ｜ <1,000
ff1> 0
0.010 << | FZ1W / FZ1T | <0.350
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group
FZ1W: Fluctuation amount [mm] of the on-axis focusing position when the first focusing group moves 1 [mm] in the optical axis direction in the wide-angle end state and the infinity focusing state.
FZ1T: Fluctuation amount [mm] of the on-axis focusing position when the first focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
ｆｆ１ ＞ ０ff1> 0
但し、 However,
ｆｆ１：前記第１合焦群の焦点距離 ff1: Focal length of the first focusing group
ｆｆ２ ＜ ０ff2 <0
但し、 However,
ｆｆ２：前記第２合焦群の焦点距離 ff2: Focal length of the second focusing group
０．０１０ ＜ ｜ＦＺ１Ｗ／ＦＺ１Ｔ｜ ＜ １．５００
但し、
ＦＺ１Ｗ：広角端状態且つ無限遠合焦状態において前記第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］
ＦＺ１Ｔ：望遠端状態且つ無限遠合焦状態において前記第１合焦群が光軸方向に１［ｍｍ］移動した際の軸上合焦位置の変動量［ｍｍ］ The variable magnification optical system according to any one of claims 1 to 3, wherein the variable magnification optical system satisfies the condition of the following equation.
0.010 << | FZ1W / FZ1T | <1.50
However,
FZ1W: Fluctuation amount [mm] of the on-axis focusing position when the first focusing group moves 1 [mm] in the optical axis direction in the wide-angle end state and the infinity focusing state.
FZ1T: Fluctuation amount [mm] of the on-axis focusing position when the first focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
変倍時に、前記物体側レンズ群と前記物体側合焦群との間隔が変化することを特徴とする請求項２〜４のいずれか一項に記載の変倍光学系。 It has at least one object-side lens group on the object side of the object-side in-focus group.
The variable magnification optical system according to any one of claims 2 to 4, wherein the distance between the object-side lens group and the object-side focusing group changes at the time of scaling.
変倍時に、前記負レンズ群と前記物体側合焦群との間隔が変化することを特徴とする請求項１〜９のいずれか一項に記載の変倍光学系。 It has at least one negative lens group having a negative refractive power on the object side of the object-side focusing group.
The variable magnification optical system according to any one of claims 1 to 9, wherein the distance between the negative lens group and the object-side focusing group changes at the time of scaling.
変倍時に、前記正レンズ群と前記負レンズ群との間隔、及び、前記負レンズ群と前記物体側合焦群との間隔が変化することを特徴とする請求項１〜１０のいずれか一項に記載の変倍光学系。 At least one positive lens group having a positive refractive power and one negative lens group having a negative refractive power are provided on the object side of the object-side focusing group.
One of claims 1 to 10, wherein the distance between the positive lens group and the negative lens group and the distance between the negative lens group and the object-side focusing group change at the time of scaling. The variable magnification optical system described in the section.
νｄ１ ＞ ４５．０
但し、
νｄ１：前記第１合焦群に含まれる前記レンズの媒質のｄ線に対するアッベ数 The variable magnification optical system according to any one of claims 1 to 12, wherein the first focusing group has a lens that satisfies the conditions of the following equation.
νd1> 45.0
However,
νd1: Abbe number with respect to the d-line of the medium of the lens included in the first focusing group.
前記物体側合焦群の物体側に対向する位置には負の屈折力を有する負レンズ群を有し、
前記物体側合焦群の像側に対向する位置には正の屈折力を有する正レンズ群を有することを特徴とする請求項１〜１３のいずれか一項に記載の変倍光学系。 The object-side focusing group is one and consists of one negative lens.
A negative lens group having a negative refractive power is provided at a position facing the object side of the object-side focusing group.
The variable magnification optical system according to any one of claims 1 to 13, wherein a positive lens group having a positive refractive power is provided at a position facing the image side of the object-side focusing group.
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