JP5527516B2 - Variable magnification optical system and optical apparatus provided with the variable magnification optical system - Google Patents
Variable magnification optical system and optical apparatus provided with the variable magnification optical system Download PDFInfo
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Description
本発明は、変倍光学系、及び、この変倍光学系を備える光学機器に関する。 The present invention relates to a variable magnification optical system and an optical apparatus including the variable magnification optical system.
従来、写真用カメラ、電子スチルカメラ、ビデオカメラ等に適した変倍光学系が提案されている（例えば、特許文献１参照）。 Conventionally, a variable magnification optical system suitable for a photographic camera, an electronic still camera, a video camera, and the like has been proposed (see, for example, Patent Document 1).
しかしながら、従来の望遠系の変倍光学系では、高い光学性能を維持しながら変倍比を大きくすることが困難であった。 However, in the conventional telephoto variable power optical system, it is difficult to increase the zoom ratio while maintaining high optical performance.
本発明はこのような課題に鑑みてなされたものであり、高い光学性能を有する変倍光学系、及び、この変倍光学系を備える光学機器を提供することを目的とする。 The present invention has been made in view of such a problem, a variable magnification optical system having high optical performance, and aims to provide an optical apparatus equipped with this zoom optical system.
前記課題を解決するために、本発明に係る変倍光学系は、物体側から順に、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、正の屈折力を有する第３レンズ群と、正の屈折力を有する第４レンズ群と、を有し、広角端状態から望遠端状態に変倍する際に、第１レンズ群と第２レンズ群との間隔が増大し、第２レンズ群と第３レンズ群との間隔が減少し、第３レンズ群と第４レンズ群との間隔が一旦減少した後増大し、第３レンズ群の少なくとも一部は、光軸に沿って移動することにより無限遠から近距離物体までの合焦を行い、望遠端状態での全系の焦点距離をｆｔとし、広角端状態での全系の焦点距離をｆｗとし、第１レンズ群の焦点距離をｆ１とし、第２レンズ群の焦点距離をｆ２としたとき、次式
８．８０ ＜ ｆｔ／（−ｆ２） ＜ １２．００
０．４０ ＜ ｆｗ／ｆ１ ＜ ０．６０
２．００ ＜ ｆ１／（−ｆ２） ＜ ４．８０
の条件を満足する。
In order to solve the above problems, a variable magnification optical system according to the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refraction. A third lens group having a positive power and a fourth lens group having a positive refractive power, and when zooming from the wide-angle end state to the telephoto end state, the first lens group and the second lens group The distance increases, the distance between the second lens group and the third lens group decreases, the distance between the third lens group and the fourth lens group decreases once, and then increases, at least a part of the third lens group , Focusing from infinity to a short distance object by moving along the optical axis, the focal length of the entire system in the telephoto end state is ft, the focal length of the entire system in the wide angle end state is fw, When the focal length of the first lens group is f1, and the focal length of the second lens group is f2, the following formula 8.80 < ft / (− f2) <12.00
0.40 <fw / f1 <0.60
2.00 <f1 / (− f2) <4.80
Satisfy the conditions.
また、このような変倍光学系は、広角端状態から望遠端状態に変倍する際に、第１レンズ群及び第４レンズ群の少なくとも一方が光軸に沿って移動することが好ましい。 In such a variable magnification optical system, it is preferable that at least one of the first lens group and the fourth lens group move along the optical axis when zooming from the wide-angle end state to the telephoto end state.
また、このような変倍光学系は、第３レンズ群の焦点距離をｆ３としたとき、次式
２．５０ ＜ ｆｔ／ｆ３ ＜ ４．５０
の条件を満足することが好ましい。
Also, in such a variable magnification optical system, when the focal length of the third lens group is f3, the following formula 2.50 <ft / f3 <4.50
It is preferable to satisfy the following conditions.
また、本発明に係る光学機器は、上述の変倍光学系のいずれかを備える。 An optical apparatus according to the present invention includes any of the above-described variable magnification optical systems.
本発明に係る変倍光学系、及び、この変倍光学系を備える光学機器を以上のように構成すると、高い光学性能を得ることができる。 Variable magnification optical system according to the present invention, and, when forming the optical apparatus equipped with this variable power optical system as described above, it is possible to obtain a high optical performance.
以下、本願の好ましい実施形態について図面を参照して説明する。まず、本実施形態の変倍光学系ＺＬは、図１に示すように、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、最も像面側に配置され、正の屈折力を有する最終レンズ群ＧＬと、を有して構成される。そして、広角端状態から望遠端状態に変倍する際に、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔が変化し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔が変化し、第３レンズ群Ｇ３と最終レンズ群ＧＬとの間隔が変化する。このような構成により、本実施形態の変倍光学系ＺＬは、Ｆナンバーが２．８〜４．２と明るく、高い光学性能を得ることができる。 Hereinafter, preferred embodiments of the present application will be described with reference to the drawings. First, as shown in FIG. 1, the variable magnification optical system ZL of the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. And a third lens group G3 having a positive refractive power and a final lens group GL which is disposed closest to the image plane and has a positive refractive power. Then, when zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group G2 changes, and the distance between the second lens group G2 and the third lens group G3 changes. Then, the distance between the third lens group G3 and the final lens group GL changes. With such a configuration, the variable magnification optical system ZL of the present embodiment has a bright F number of 2.8 to 4.2 and can obtain high optical performance.
また、本実施形態に係る変倍光学系ＺＬは、単独または複数のレンズ群、または部分レンズ群を光軸に沿って移動させて、無限遠物体から近距離物体への合焦を行う合焦レンズ群を有しても良い。この場合、合焦レンズ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（超音波モーター等の）モーター駆動にも適している。特に、第３レンズ群Ｇ３の少なくとも一部を光軸に沿って移動させ、合焦レンズ群とするのが望ましい。このように小型で軽量の第３レンズ群Ｇ３で合焦することで、迅速な合焦を行うことができる。 In addition, the variable magnification optical system ZL according to the present embodiment moves a single lens group, a plurality of lens groups, or a partial lens group along the optical axis to perform focusing from an object at infinity to a near object. You may have a lens group. In this case, the focusing lens group can be applied to autofocus, and is also suitable for driving a motor for autofocus (such as an ultrasonic motor). In particular, it is desirable to move at least a part of the third lens group G3 along the optical axis to form a focusing lens group. By focusing with the small and lightweight third lens group G3 in this way, quick focusing can be performed.
また、本実施形態に係る変倍光学系ＺＬは、望遠端状態での変倍光学系ＺＬ全系の焦点距離をｆｔとし、第２レンズ群Ｇ２の焦点距離をｆ２としたとき、以下の条件式（１）を満足することが望ましい。 In the variable magnification optical system ZL according to the present embodiment, when the focal length of the entire variable magnification optical system ZL in the telephoto end state is ft and the focal length of the second lens group G2 is f2, the following conditions are satisfied. It is desirable to satisfy Formula (1).
８．８０ ＜ ｆｔ／（−ｆ２） ＜ １２．００ （１） 8.80 <ft / (− f2) <12.00 (1)
条件式（１）は、望遠端状態での変倍光学系ＺＬ全系の焦点距離と第２レンズ群Ｇ２の焦点距離との適切な比を規定するものである。この条件式（１）の上限値を上回ると、第２レンズ群Ｇ２のパワーが強くなり、広角端での歪曲収差の補正が困難となるため好ましくない。なお、本実施形態の効果を確実にするために、条件式（１）の上限値を１１．００にすることが好ましい。反対に、条件式（１）の下限値を下回ると、第２レンズ群Ｇ２の変倍効果が小さくなるため、望遠端での全長が長くなる。また、望遠端での光学全長の増長は、望遠側の周辺光量の低下を招くため、こちらも好ましくない。なお、本実施形態の効果を確実にするために、条件式（１）の下限値を９．１０にすることが好ましい。 Conditional expression (1) defines an appropriate ratio between the focal length of the entire variable magnification optical system ZL in the telephoto end state and the focal length of the second lens group G2. Exceeding the upper limit of conditional expression (1) is not preferable because the power of the second lens group G2 becomes strong and it becomes difficult to correct distortion at the wide-angle end. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (1) to 11.00. On the contrary, if the lower limit value of conditional expression (1) is not reached, the zooming effect of the second lens group G2 becomes small, so that the total length at the telephoto end becomes long. In addition, an increase in the total optical length at the telephoto end causes a decrease in the amount of peripheral light on the telephoto side. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (1) to 9.10.
また、本実施形態に係る変倍光学系ＺＬは、広角端状態での変倍光学系ＺＬ全系の焦点距離をｆｗとし、第１レンズ群Ｇ１の焦点距離をｆ１としたとき、以下の条件式（２）を満足することが望ましい。 In the variable magnification optical system ZL according to the present embodiment, when the focal length of the entire variable magnification optical system ZL in the wide-angle end state is fw and the focal length of the first lens group G1 is f1, the following conditions are satisfied. It is desirable to satisfy Formula (2).
０．４０ ＜ ｆｗ／ｆ１ ＜ ０．６０ （２） 0.40 <fw / f1 <0.60 (2)
条件式（２）は、広角端状態での変倍光学系ＺＬ全系の焦点距離と第１レンズ群Ｇ１の焦点距離との適切な比を規定するものである。この条件式（２）の上限値を上回ると、第１レンズ群Ｇ１のパワーが強くなり、望遠端での球面収差、軸上色収差の補正が困難となるため好ましくない。なお、本実施形態の効果を確実にするために、条件式（２）の上限値を０．５８にすることが好ましい。反対に、条件式（２）の下限値を下回ると、第１レンズ郡Ｇ１のパワーが弱くなり、変倍時の第１レンズ群Ｇ１の移動量が大きくなる。望遠端での光学全長の増長は、望遠側の周辺光量の低下を招くため、こちらも好ましくない。なお、本実施形態の効果を確実にするために、条件式（２）の下限値を０．４２にすることが好ましい。 Conditional expression (2) defines an appropriate ratio between the focal length of the entire variable magnification optical system ZL in the wide-angle end state and the focal length of the first lens group G1. Exceeding the upper limit of conditional expression (2) is not preferable because the power of the first lens group G1 becomes strong and it becomes difficult to correct spherical aberration and axial chromatic aberration at the telephoto end. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (2) to 0.58. On the other hand, if the lower limit value of conditional expression (2) is not reached, the power of the first lens group G1 becomes weak and the amount of movement of the first lens group G1 during zooming becomes large. Since the increase in the total optical length at the telephoto end causes a decrease in the peripheral light amount on the telephoto side, this is also not preferable. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (2) to 0.42.
また、本実施形態に係る変倍光学系ＺＬは、以下の条件式（３）を満足することが望ましい。 In addition, it is desirable that the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (3).
２．００ ＜ ｆ１／（−ｆ２） ＜ ４．８０ （３） 2.00 <f1 / (− f2) <4.80 (3)
条件式（３）は、第２レンズ群Ｇ２の焦点距離に対する、適切な第１レンズ群Ｇ１の焦点距離を規定するものである。この条件式（３）の上限値を上回ると、第２レンズ群Ｇ２のパワーが強くなり、広角端での像面湾曲、歪曲収差の補正が困難となるため好ましくない。なお、本実施形態の効果を確実にするために、条件式（３）の上限値を４．３０にすることが好ましい。反対に、条件式（３）の下限値を下回ると、第１レンズ群Ｇ１のパワーが強くなり、望遠端での球面収差、軸上色収差の補正が困難となるため好ましくない。なお、本実施形態の効果を確実にするために、条件式（３）の下限値を２．５０にすることが好ましい。 Conditional expression (3) defines an appropriate focal length of the first lens group G1 with respect to the focal length of the second lens group G2. Exceeding the upper limit of conditional expression (3) is not preferable because the power of the second lens group G2 becomes strong and it becomes difficult to correct curvature of field and distortion at the wide angle end. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (3) to 4.30. On the other hand, if the lower limit value of conditional expression (3) is not reached, the power of the first lens group G1 becomes strong, and it becomes difficult to correct spherical aberration and axial chromatic aberration at the telephoto end. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (3) to 2.50.
また、本実施形態に係る変倍光学系ＺＬは、広角端状態から望遠端状態に変倍する際に、第１レンズ群Ｇ１及び最終レンズ群ＧＬの少なくとも一方が光軸に沿って移動することが望ましい。このような構成とする事で、変倍に係る各レンズ群のパワーを弱くし、ズーム全域で良好な光学性能を確保する事が可能となる。所定のズーム比（例えば、本実施形態に係る変倍光学系では５倍程度）を達成するためには、第１レンズ群Ｇ１及び最終レンズ群ＧＬの少なくとも一方を光軸にそって移動させて変倍しないと、各レンズ群の屈折力が強くなりすぎ、収差の補正が困難になる。特に、第２レンズ群Ｇ２の屈折力が強くなりすぎると像面湾曲が大きくなり補正することが困難になり、第３レンズ群Ｇ３の屈折力が強くなりすぎると合焦時の収差補正が困難になる。 In the zoom optical system ZL according to the present embodiment, when zooming from the wide-angle end state to the telephoto end state, at least one of the first lens group G1 and the final lens group GL moves along the optical axis. Is desirable. By adopting such a configuration, it is possible to weaken the power of each lens group related to zooming and to ensure good optical performance over the entire zoom range. In order to achieve a predetermined zoom ratio (for example, about 5 times in the variable magnification optical system according to the present embodiment), at least one of the first lens group G1 and the final lens group GL is moved along the optical axis. Unless zooming is performed, the refractive power of each lens unit becomes too strong, and it becomes difficult to correct aberrations. In particular, if the refractive power of the second lens group G2 becomes too strong, the curvature of field becomes large and correction becomes difficult, and if the refractive power of the third lens group G3 becomes too strong, it is difficult to correct aberrations during focusing. become.
また、本実施形態に係る変倍光学系ＺＬは、第３レンズ群Ｇ３の焦点距離をｆ３としたとき、以下の条件式（４）を満足することが望ましい。 In addition, it is desirable that the zoom optical system ZL according to the present embodiment satisfies the following conditional expression (4) when the focal length of the third lens group G3 is f3.
２．５０ ＜ ｆｔ／ｆ３ ＜ ４．５０ （４） 2.50 <ft / f3 <4.50 (4)
条件式（４）は、望遠端状態での変倍光学系ＺＬ全系の焦点距離と第１レンズ群Ｇ１の焦点距離との適切な比を規定するものである。この条件式（４）の上限値を上回ると、第１レンズ群Ｇ１のパワーが強くなり、望遠端での球面収差、軸上色収差の補正がと困難となるため好ましくない。なお、本実施形態の効果を確実にするために、条件式（４）の上限値を３．００にすることが好ましい。反対に、条件式（４）の下限値を下回ると、第１レンズ群Ｇ１のパワーが弱くなり、変倍時の第１レンズ群Ｇ１の移動量が大きくなる。望遠端での光学全長の増長は、望遠側の周辺光量の低下を招くため、こちらも好ましくない。なお、本実施形態の効果を確実にするために、条件式（４）の下限値を２．３０にすることが好ましい。 Conditional expression (4) defines an appropriate ratio between the focal length of the entire variable magnification optical system ZL in the telephoto end state and the focal length of the first lens group G1. Exceeding the upper limit of conditional expression (4) is not preferable because the power of the first lens group G1 becomes strong and it becomes difficult to correct spherical aberration and axial chromatic aberration at the telephoto end. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (4) to 3.00. On the other hand, if the lower limit value of conditional expression (4) is not reached, the power of the first lens group G1 becomes weak and the amount of movement of the first lens group G1 during zooming increases. Since the increase in the total optical length at the telephoto end causes a decrease in the peripheral light amount on the telephoto side, this is also not preferable. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (4) to 2.30.
図７に、上述の変倍光学系ＺＬを備える光学機器として、デジタル一眼レフカメラ１（以後、単にカメラと記す）の略断面図を示す。このカメラ１において、不図示の物体（被写体）からの光は、変倍光学系２（変倍光学系ＺＬ）で集光されて、クイックリターンミラー３を介して焦点板４に結像される。そして、焦点板４に結像された光は、ペンタプリズム５中で複数回反射されて接眼レンズ６へと導かれる。これにより、撮影者は、物体（被写体）像を接眼レンズ６を介して正立像として観察することができる。
FIG. 7 shows a schematic cross-sectional view of a digital single-lens reflex camera 1 (hereinafter simply referred to as a camera) as an optical apparatus including the above-described variable magnification optical system ZL. In this
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、クイックリターンミラー３が光路外へ退避し、変倍光学系２で集光された不図示の物体（被写体）の光は撮像素子７上に被写体像を形成する。これにより、物体（被写体）からの光は、当該撮像素子７により撮像され、物体（被写体）画像として不図示のメモリに記録される。このようにして、撮影者は本カメラ１による物体（被写体）の撮影を行うことができる。なお、図７に記載のカメラ１は、変倍光学系ＺＬを着脱可能に保持するものでも良く、変倍光学系ＺＬと一体に成形されるものでも良い。また、カメラ１は、いわゆる一眼レフカメラでも良く、クイックリターンミラー等を有さないコンパクトカメラでも良い。
When the release button (not shown) is pressed by the photographer, 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.
まず、上述の説明及び以降に示す実施例においては、４，５群構成を示したが、以上の構成条件等は、６群、７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。また、レンズ群とは、変倍時に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。 First, in the above description and the embodiments described below, the configuration of the fourth and fifth groups is shown. However, the above configuration conditions and the like can be applied to other group configurations such as the sixth group and the seventh group. Further, a configuration in which a lens or a lens group is added to the most object side, or a configuration in which a lens or a lens group is added to the most image side may be used. The lens group refers to a portion having at least one lens separated by an air interval that changes during zooming.
また、レンズ群または部分レンズ群を光軸に垂直な方向の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、手ブレによって生じる像ブレを補正する防振レンズ群としても良い。特に、第２レンズ群Ｇ２、最終レンズ群ＧＬまたは最終レンズ群ＧＬの直前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するのが好ましい。 In addition, the lens group or the partial lens group is moved so as to have a component in a direction perpendicular to the optical axis, or is rotated (swayed) in the in-plane direction including the optical axis to reduce image blur caused by camera shake. A vibration-proof lens group to be corrected may be used. In particular, it is preferable that at least a part of the second lens group G2, the last lens group GL, or the lens group disposed immediately before the final lens group GL is an anti-vibration lens group.
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妨げるので好ましい。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。全てのレンズ面を球面または平面で構成できるので、望遠系ズームレンズとしても好ましい。また、レンズ面が非球面の場合、この非球面は、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）あるいはプラスチックレンズとしても良い。 Further, the lens surface may be formed as a spherical surface, a flat surface, or an aspheric surface. It is preferable that the lens surface is a spherical surface or a flat surface because lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to errors in processing and assembly adjustment is prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance. Since all lens surfaces can be constituted by spherical surfaces or flat surfaces, it is also preferable as a telephoto zoom lens. In addition, when the lens surface is aspheric, this aspherical surface is an aspherical surface by grinding, a glass mold aspherical surface made of glass with an aspherical shape, and a composite type in which resin is formed on the glass surface in an aspherical shape. Any aspherical surface may be used. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
開口絞りＳは、最終レンズ群ＧＬ近傍または最終レンズ群ＧＬの直前に配置されたレンズ群内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良い。 The aperture stop S is preferably arranged in the vicinity of the final lens group GL or in the lens group arranged immediately before the final lens group GL. However, the role of the aperture stop S is not provided in the lens frame without providing a member as an aperture stop. You may substitute.
さらに、各レンズ面には、フレアやゴーストを軽減し高コントラストの高い光学性能を達成するために、広い波長域で高い透過率を有する反射防止膜を施しても良い。 Further, each lens surface may be provided with an antireflection film having a high transmittance in a wide wavelength region in order to reduce flare and ghost and achieve high optical performance with high contrast.
本実施形態に係る変倍光学系ＺＬは、３５ｍｍフィルムサイズ換算での焦点距離が広角端状態で５０〜７０ｍｍ程度であり、また、望遠端状態で３００〜４００ｍｍ程度である。また、本実施形態に係る変倍光学系ＺＬは、第３レンズ群Ｇ３が１つの単レンズと１つの接合レンズとを有するのが好ましい。 In the variable magnification optical system ZL according to this embodiment, the focal length in terms of 35 mm film size is about 50 to 70 mm in the wide-angle end state, and is about 300 to 400 mm in the telephoto end state. In the variable magnification optical system ZL according to the present embodiment, it is preferable that the third lens group G3 has one single lens and one cemented lens.
なお、本願を分かり易く説明するために実施形態の構成要件を付して説明したが、本願がこれに限定されるものではないことは言うまでもない。 In addition, in order to explain this application in an easy-to-understand manner, the configuration requirements of the embodiment have been described, but it goes without saying that the present application is not limited to this.
以下、本実施形態の変倍光学系ＺＬの製造方法の概略を、図８を参照して説明する。まず、各レンズを配置してレンズ群をそれぞれ準備する（ステップＳ１００）。具体的に、本実施形態では、例えば、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Ｌ１０１と物体側に凸面を向けた正メニスカスレンズＬ１０２との接合レンズ、両凸レンズＬ１０３、及び、物体側に凸面を向けた正メニスカスレンズＬ１０４を配置して第１レンズ群Ｇ１とし、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Ｌ２０１、両凹レンズＬ２０２と両凸レンズＬ２０３との接合レンズ、及び、物体側に凹面を向けた負メニスカスレンズＬ２０４を配置して第２レンズ群Ｇ２とし、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Ｌ３０１と両凸レンズＬ３０２との接合レンズ、及び、物体側に凸面を向けた正メニスカスレンズＬ３０３を配置して第３レンズ群Ｇ３とし、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Ｌ４０１、両凸レンズＬ４０２と両凹レンズＬ４０３との接合レンズ、両凹レンズＬ４０４と物体側に凸面を向けた正メニスカスレンズＬ４０５との接合レンズ、両凸レンズＬ４０６、物体側に凸面を向けた負メニスカスレンズＬ４０７と両凸レンズＬ４０８との接合レンズ、物体側に凹面を向けた負メニスカスレンズＬ４０９、及び、両凸レンズＬ４１０を配置して最終レンズ群ＧＬとする。このようにして準備した各レンズ群を配置して変倍光学系ＺＬを製造する。 Hereinafter, the outline of the manufacturing method of the variable magnification optical system ZL of this embodiment is demonstrated with reference to FIG. First, each lens is arranged and a lens group is prepared (step S100). Specifically, in this embodiment, for example, in order from the object side, a cemented lens of a negative meniscus lens L101 having a convex surface facing the object side and a positive meniscus lens L102 having a convex surface facing the object side, a biconvex lens L103, and A positive meniscus lens L104 having a convex surface facing the object side is arranged to form the first lens group G1, and a negative meniscus lens L201 having a convex surface facing the object side, a biconcave lens L202, and a biconvex lens L203 in order from the object side. A negative meniscus lens L204 having a concave surface facing the object side to form a second lens group G2, and a cemented lens of a negative meniscus lens L301 having a convex surface facing the object side and a biconvex lens L302 in order from the object side, A positive meniscus lens L303 having a convex surface facing the object side is arranged as a third lens group G3, and in order from the object side, A positive meniscus lens L401 with a convex surface facing the side, a cemented lens with a biconvex lens L402 and a biconcave lens L403, a cemented lens with a biconcave lens L404 and a positive meniscus lens L405 with a convex surface facing the object side, a biconvex lens L406, on the object side A final lens group GL is formed by arranging a cemented lens of a negative meniscus lens L407 having a convex surface and a biconvex lens L408, a negative meniscus lens L409 having a concave surface on the object side, and a biconvex lens L410. The variable power optical system ZL is manufactured by arranging the lens groups thus prepared.
この場合、広角端状態から望遠端状態に変倍する際に、第１レンズ群Ｇ１と第２レンズ群Ｇ２との間隔が変化し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間隔が変化し、第３レンズ群Ｇ３と最終レンズ群ＧＬとの間隔が変化し、第３レンズ群Ｇ３の少なくとも一部は、光軸に沿って移動することにより無限遠から近距離物体までの合焦を行うように配置する（ステップＳ２００）。また、望遠端状態での変倍光学系ＺＬ全系の焦点距離をｆｔとし、第２レンズ群Ｇ２の焦点距離をｆ２とし、第３レンズ群Ｇ３の焦点距離をｆ３としたとき、前出の条件式（１）及び（２）を満足するよう各レンズ群を配置する（ステップＳ３００）。 In this case, when zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group G2 changes, and the distance between the second lens group G2 and the third lens group G3 is changed. The distance between the third lens group G3 and the final lens group GL changes, and at least a part of the third lens group G3 moves along the optical axis to focus from an infinite distance to a close object. Arrange to do so (step S200). Further, when the focal length of the entire variable magnification optical system ZL in the telephoto end state is ft, the focal length of the second lens group G2 is f2, and the focal length of the third lens group G3 is f3, the above-mentioned Each lens group is arranged so as to satisfy the conditional expressions (1) and (2) (step S300).
以下、本願の各実施例を、添付図面に基づいて説明する。図１、図３及び図５に、変倍光学系ＺＬ１〜ＺＬ３の屈折力配分及び広角端状態（Ｗ）から望遠端状態（Ｔ）への焦点距離状態の変化における各レンズ群の移動の様子を示す。各図中、（ａ）は広角端状態での各レンズ群を、（ｂ）は中間焦点距離状態でのレンズ群を、（ｃ）は望遠端状態でのレンズ群を、それぞれ示す。第１及び第２実施例に係る変倍光学系ＺＬ１，ＺＬ２は、図１及び図３に示すように、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、正の屈折力を有する最終レンズ群ＧＬとから構成され、広角端から望遠端への変倍に際し、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と最終レンズ群ＧＬとの空気間隔が変化するように、第１レンズ群Ｇ１と第３レンズ群Ｇ３と最終レンズ群ＧＬとが物体方向に移動し、第２レンズ群Ｇ２が移動する。無限遠物体から近距離物体への合焦は、第３レンズ群Ｇ３を物体方向に移動させることによって行う。 Embodiments of the present application will be described below with reference to the accompanying drawings. 1, 3, and 5 show how the lens groups move in the refractive power distribution of the variable magnification optical systems ZL <b> 1 to ZL <b> 3 and the change in the focal length state from the wide-angle end state (W) to the telephoto end state (T). Indicates. In each figure, (a) shows each lens group in the wide-angle end state, (b) shows a lens group in the intermediate focal length state, and (c) shows a lens group in the telephoto end state. As shown in FIGS. 1 and 3, the variable magnification optical systems ZL1 and ZL2 according to the first and second examples include a first lens group G1 having a positive refractive power and a negative refractive power in order from the object side. 2, a third lens group G3 having a positive refractive power, and a final lens group GL having a positive refractive power, and at the time of zooming from the wide angle end to the telephoto end, The air gap between the lens group G1 and the second lens group G2 increases, the air gap between the second lens group G2 and the third lens group G3 decreases, and the air gap between the third lens group G3 and the final lens group GL. So that the first lens group G1, the third lens group G3, and the final lens group GL move in the object direction, and the second lens group G2 moves. Focusing from an infinite object to a close object is performed by moving the third lens group G3 in the object direction.
参考例に係る変倍光学系ＺＬ３は、図５に示すように、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、負の屈折率を有する第４レンズ群Ｇ４と、正の屈折力を有する最終レンズ群ＧＬとから構成され、広角端から望遠端への変倍に際し、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レンズ群と最終レンズ群ＧＬとの空気間隔が減少するように、第１レンズ群Ｇ１と第３レンズ群Ｇ３と第４レンズ群Ｇ４と最終レンズ群ＧＬとが物体方向に移動し、第２レンズ群Ｇ２が移動する。無限遠物体から近距離物体への合焦は、第３レンズ群Ｇ３を物体方向に移動させることによって行う。 As shown in FIG. 5, the variable magnification optical system ZL3 according to the reference example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, A third lens group G3 having a negative refractive index, a fourth lens group G4 having a negative refractive index, and a final lens group GL having a positive refractive power, and at the time of zooming from the wide-angle end to the telephoto end. The air gap between the first lens group G1 and the second lens group G2 increases, the air gap between the second lens group G2 and the third lens group G3 decreases, and the third lens group G3 and the fourth lens group G4. The first lens group G1, the third lens group G3, the fourth lens group G4, and the final lens group GL so that the air distance between the fourth lens group and the final lens group GL decreases. Moves in the object direction, and the second lens group G2 moves. Focusing from an infinite object to a close object is performed by moving the third lens group G3 in the object direction.
〔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Ｌ１０１と物体側に凸面を向けた正メニスカスレンズＬ１０２との接合レンズ、両凸レンズＬ１０３、及び、物体側に凸面を向けた正メニスカスレンズＬ１０４から構成されている。第２レンズ群Ｇ２は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ２０１、両凹レンズＬ２０２と両凸レンズＬ２０３との接合レンズ、及び、物体側に凹面を向けた負メニスカスレンズＬ２０４から構成されている。第３レンズ群Ｇ３は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ３０１と両凸レンズＬ３０２との接合レンズ、及び、物体側に凸面を向けた正メニスカスレンズＬ３０３から構成されている。最終レンズ群ＧＬ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Ｌ４０１、両凸レンズＬ４０２と両凹レンズＬ４０３との接合レンズ、両凹レンズＬ４０４と物体側に凸面を向けた正メニスカスレンズＬ４０５との接合レンズ、両凸レンズＬ４０６、物体側に凸面を向けた負メニスカスレンズＬ４０７と両凸レンズＬ４０８との接合レンズ、物体側に凹面を向けた負メニスカスレンズＬ４０９、及び、両凸レンズＬ４１０から構成されている。
[First embodiment]
FIG. 1 is a diagram showing a configuration of a variable magnification optical system ZL1 according to the first example. In the variable magnification optical system ZL1 of FIG. 1, the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L101 having a convex surface facing the object side and a positive meniscus lens L102 having a convex surface facing the object side. , A biconvex lens L103, and a positive meniscus lens L104 having a convex surface facing the object side. The second lens group G2 includes, in order from the object side, a negative meniscus lens L201 having a convex surface facing the object side, a cemented lens of a biconcave lens L202 and a biconvex lens L203, and a negative meniscus lens L204 having a concave surface facing the object side. It is configured. The third lens group G3 includes, in order from the object side, a cemented lens of a negative meniscus lens L301 having a convex surface facing the object side and a biconvex lens L302, and a positive meniscus lens L303 having a convex surface facing the object side. . The final lens group GL includes, in order from the object side, a positive meniscus lens L401 having a convex surface facing the object side, a cemented lens of the biconvex lens L402 and the biconcave lens L403, and a positive meniscus lens L405 having a convex surface facing the biconcave lens L404 and the object side. And a biconvex lens L406, a negative meniscus lens L407 having a convex surface facing the object side and a biconvex lens L408, a negative meniscus lens L409 having a concave surface facing the object side, and a biconvex lens L410. Yes.
また、第１実施例において、最終レンズ群ＧＬの負メニスカスレンズＬ４０７と両凸レンズＬ４０８との接合レンズを、光軸と略直交方向の成分を持つように移動することにより手ブレによる像ブレ補正（防振）を行う。開口絞りＳ及び固定絞りＦＳは、最終レンズ群ＧＬ内に位置し、広角端から望遠端への変倍時に際して最終レンズ群ＧＬと一体に移動するよう構成されている。 Further, in the first embodiment, image blur correction due to camera shake is performed by moving the cemented lens of the negative meniscus lens L407 and the biconvex lens L408 of the final lens group GL so as to have a component substantially orthogonal to the optical axis ( Anti-vibration). The aperture stop S and the fixed stop FS are located in the final lens group GL, and are configured to move together with the final lens group GL at the time of zooming from the wide angle end to the telephoto end.
以下の表１に、第１実施例の諸元の値を掲げる。この表１において、ｆは全系の焦点距離、ＦＮＯはＦナンバー、２ωは画角（単位は「°」）、Ｂｆはバックフォーカスをそれぞれ表している。さらに、面番号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を、面間隔は各光学面から次の光学面までの光軸上の間隔を、屈折率及びアッベ数はそれぞれｄ線（λ＝５８７．６ｎｍ）に対する値を示している。また、全長は物体面から像面までの距離を示している。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、曲率半径、面間隔、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。尚、曲率半径0.000は平面を示し、空気の屈折率1.00000は省略してある。なお、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。 Table 1 below lists values of specifications of the first embodiment. In Table 1, f represents the focal length of the entire system, FNO represents the F number, 2ω represents the angle of view (unit is “°”), and Bf represents the back focus. Furthermore, the surface number is the order of the lens surfaces from the object side along the direction of travel of the light beam, the surface interval is the distance on the optical axis from each optical surface to the next optical surface, and the refractive index and Abbe number are each The value for the d-line (λ = 587.6 nm) is shown. The total length indicates the distance from the object plane to the image plane. Here, “mm” is generally used for the focal length, the radius of curvature, the surface interval, and other length units listed in all the following specifications, but the optical system is proportionally enlarged or reduced. However, the same optical performance can be obtained, and the present invention is not limited to this. The radius of curvature of 0.000 indicates a plane, and the refractive index of air of 1.0000 is omitted. The description of these symbols and the description of the specification table are the same in the following examples.
（表１）
広角端 中間焦点距離 望遠端
f = 56.500 〜 104.999 〜 291.995
F.NO = 2.880 〜 3.400 〜 4.143
２ω = 43.005 〜 22.963 〜 8.313
像高 = 21.600 〜 21.600 〜 21.600
全長 =250.598 〜 261.251 〜 286.598
Bf = 38.468 〜 54.739 〜 74.133
面番号 曲率半径 面間隔 屈折率 アッベ数
1 220.000 2.000 1.829595 33.23
2 93.651 7.825 1.497820 82.56
3 549.729 0.100
4 129.641 7.472 1.497820 82.56
5 -1000.000 0.100
6 94.611 7.632 1.497820 82.56
7 1000.000 (d1)
8 214.531 1.800 1.830291 44.44
9 33.737 8.540
10 -65.839 1.400 1.487490 70.23
11 40.923 6.500 1.846660 23.78
12 -715.946 3.536
13 -46.644 1.400 1.798720 47.26
14 -141.024 (d2)
15 630.978 1.400 1.863045 29.44
16 77.504 6.370 1.718918 54.49
17 -132.494 0.100
18 118.440 3.625 1.753959 52.38
19 2994.076 (d3)
20 38.228 7.749 1.501201 69.51
21 1046.461 0.100
22 45.744 5.926 1.497820 82.56
23 -1641.460 1.400 1.870384 35.40
24 53.778 4.400
25 0.000 4.400 開口絞りＳ
26 -100.026 1.400 1.779485 35.95
27 33.135 4.053 1.508539 69.14
28 83.510 0.100
29 36.912 6.120 1.515928 57.19
30 -142.908 9.000
31 214.043 1.400 1.877741 37.07
32 24.474 6.591 1.830219 24.21
33 -109.122 0.906
34 0.000 14.063 固定絞りＦＳ
35 -23.497 1.400 1.849392 24.58
36 -61.589 0.100
37 97.156 3.516 1.487490 70.23
38 -135.285 (Bf)
［レンズ群焦点距離］
レンズ群 始面 焦点距離
第１レンズ群 1 120.005
第２レンズ群 8 -30.9276
第３レンズ群 15 90.400
最終レンズ群 20 164.396
(Table 1)
Wide angle end Intermediate focal length Telephoto end
f = 56.500 to 104.999 to 291.995
F.NO = 2.880 to 3.400 to 4.143
2ω = 43.005 〜 22.963 〜 8.313
Image height = 21.600 to 21.600 to 21.600
Total length = 250.598 to 261.251 to 286.598
Bf = 38.468 to 54.739 to 74.133
Surface number Curvature radius Surface spacing Refractive index Abbe number
1 220.000 2.000 1.829595 33.23
2 93.651 7.825 1.497820 82.56
3 549.729 0.100
4 129.641 7.472 1.497820 82.56
5 -1000.000 0.100
6 94.611 7.632 1.497820 82.56
7 1000.000 (d1)
8 214.531 1.800 1.830291 44.44
9 33.737 8.540
10 -65.839 1.400 1.487490 70.23
11 40.923 6.500 1.846660 23.78
12 -715.946 3.536
13 -46.644 1.400 1.798720 47.26
14 -141.024 (d2)
15 630.978 1.400 1.863045 29.44
16 77.504 6.370 1.718918 54.49
17 -132.494 0.100
18 118.440 3.625 1.753959 52.38
19 2994.076 (d3)
20 38.228 7.749 1.501201 69.51
21 1046.461 0.100
22 45.744 5.926 1.497820 82.56
23 -1641.460 1.400 1.870384 35.40
24 53.778 4.400
25 0.000 4.400 Aperture stop S
26 -100.026 1.400 1.779485 35.95
27 33.135 4.053 1.508539 69.14
28 83.510 0.100
29 36.912 6.120 1.515928 57.19
30 -142.908 9.000
31 214.043 1.400 1.877741 37.07
32 24.474 6.591 1.830219 24.21
33 -109.122 0.906
34 0.000 14.063 Fixed aperture FS
35 -23.497 1.400 1.849392 24.58
36 -61.589 0.100
37 97.156 3.516 1.487490 70.23
38 -135.285 (Bf)
[Lens focal length]
Lens group Start surface Focal length
Second lens group 8 -30.9276
この第１実施例において、第１レンズ群Ｇ１と第２レンズ群Ｇ２との軸上空気間隔ｄ１、第２レンズ群Ｇ２と第３レンズ群Ｇ３との軸上空気間隔ｄ２、及び、第３レンズ群Ｇ３と最終レンズ群ＧＬとの軸上空気間隔ｄ３は変倍に際して変化する。次の表２に、この第１実施例に係る変倍光学系ＺＬ１の広角端状態、中間焦点距離状態、望遠端状態の各焦点距離における可変間隔データを示す。 In the first embodiment, the axial air distance d1 between the first lens group G1 and the second lens group G2, the axial air distance d2 between the second lens group G2 and the third lens group G3, and the third lens The axial air distance d3 between the group G3 and the final lens group GL changes upon zooming. Table 2 below shows variable interval data at each focal length in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system ZL1 according to the first example.
（表２）
広角端 中間焦点距離 望遠端
d1 2.000 25.389 52.462
d2 48.576 32.442 2.400
d3 29.130 16.257 25.179
(Table 2)
Wide angle end Intermediate focal length Telephoto end
d1 2.000 25.389 52.462
d2 48.576 32.442 2.400
d3 29.130 16.257 25.179
次の表３に、この第１実施例における条件式対応値を示す。なおこの表３において、ｆ１は第１レンズ群Ｇ１の焦点距離を、ｆ２は第２レンズ群Ｇ２の焦点距離を、ｆ３は第３レンズ群Ｇ３の焦点距離を、ｆｔは望遠端状態での変倍光学系ＺＬ全系の合成焦点距離を、ｆｗは広角端状態での変倍光学系ＺＬ全系の焦点距離を、それぞれ表している。以降の実施例においても、特にことわりのない場合は、この符号の説明は同様である。 Table 3 below shows values corresponding to the conditional expressions in the first embodiment. In Table 3, f1 is the focal length of the first lens group G1, f2 is the focal length of the second lens group G2, f3 is the focal length of the third lens group G3, and ft is the change in the telephoto end state. The combined focal length of the entire magnifying optical system ZL system and fw represents the focal length of the entire magnifying optical system ZL system in the wide-angle end state. In the following embodiments, the description of the reference numerals is the same unless otherwise specified.
（表３）
（１）ｆｔ／（−ｆ２）＝9.44
（２）ｆｗ／ｆ１＝0.47
（３）ｆ１／（−ｆ２）＝3.88
（４）ｆｔ／ｆ３＝3.23
(Table 3)
(1) ft / (− f2) = 9.44
(2) fw / f1 = 0.47
(3) f1 / (− f2) = 3.88
(4) ft / f3 = 3.23
この第１実施例の広角端状態での無限遠合焦状態の収差図を図２（ａ）に、中間焦点距離状態での無限遠合焦状態の収差図を図２（ｂ）に、望遠端状態での無限遠合焦状態の収差図を図２（ｃ）にそれぞれ示す。各収差図において、非点収差図中の実線はサジタル像面を、破線はメリディオナル像面を示し、ＦＮＯはＦナンバーを、Ｙは像高を表す。また、各収差図中でｄ，ｇはそれぞれｄ線（λ＝５８７．６ｎｍ）、ｇ線（λ＝４３５．６ｎｍ）における収差を表す。各収差図から明らかなように、第１実施例では、広角端状態から望遠端状態までの各焦点距離状態において諸収差が良好に補正され、優れた光学性能を有することがわかる。 FIG. 2A shows an aberration diagram in the infinite focus state in the wide-angle end state of this first embodiment, and FIG. 2B shows an aberration diagram in the infinite focus state in the intermediate focal length state. FIG. 2C shows aberration diagrams in the infinitely focused state in the end state. In each graph showing astigmatism, the solid line represents the sagittal image plane, the broken line represents the meridional image plane, FNO represents the F number, and Y represents the image height. In each aberration diagram, d and g represent aberrations at the d-line (λ = 587.6 nm) and g-line (λ = 435.6 nm), respectively. As is apparent from each aberration diagram, in the first example, various aberrations are well corrected in each focal length state from the wide-angle end state to the telephoto end state, and excellent optical performance is obtained.
〔第２実施例〕
図３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３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Ｌ１０１と物体側に凸面を向けた正メニスカスレンズＬ１０２との接合レンズ、物体側に凸面を向けた正メニスカスレンズＬ１０３、及び、両凸レンズＬ１０４から構成されている。第２レンズ群Ｇ２は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ２０１、両凹レンズＬ２０２と両凸レンズＬ２０３との接合レンズ、及び、物体側に凹面を向けた負メニスカスレンズＬ２０４から構成されている。第３レンズ群Ｇ３は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ３０１と両凸レンズＬ３０２との接合レンズ、及び、両凸レンズＬ３０３から構成されている。最終レンズ群ＧＬ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Ｌ４０１、物体側に凸面を向けた正メニスカスレンズＬ４０２と物体側に凸面を向けた負メニスカスレンズＬ４０３との接合レンズ、両凹レンズＬ４０４と物体側に凸面を向けた正メニスカスレンズＬ４０５との接合レンズ、両凸レンズＬ４０６、物体側に凸面を向けた負メニスカスレンズＬ４０７と両凸レンズＬ４０８との接合レンズ、物体側に凹面を向けた負メニスカスレンズＬ４０９、及び、両凸レンズＬ４１０から構成されている。
[Second Embodiment]
FIG. 3 is a diagram showing a configuration of the variable magnification optical system ZL2 according to the second example. In the variable magnification optical system ZL2 of FIG. 3, the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L101 having a convex surface facing the object side and a positive meniscus lens L102 having a convex surface facing the object side. And a positive meniscus lens L103 having a convex surface facing the object side, and a biconvex lens L104. The second lens group G2 includes, in order from the object side, a negative meniscus lens L201 having a convex surface facing the object side, a cemented lens of a biconcave lens L202 and a biconvex lens L203, and a negative meniscus lens L204 having a concave surface facing the object side. It is configured. The third lens group G3 includes, in order from the object side, a cemented lens of a negative meniscus lens L301 having a convex surface facing the object side and a biconvex lens L302, and a biconvex lens L303. The final lens group GL includes, in order from the object side, a positive meniscus lens L401 having a convex surface facing the object side, a positive meniscus lens L402 having a convex surface facing the object side, and a negative meniscus lens L403 having a convex surface facing the object side. A cemented lens of a biconcave lens L404 and a positive meniscus lens L405 with a convex surface facing the object side, a biconvex lens L406, a cemented lens of a negative meniscus lens L407 with a convex surface facing the object side and a biconvex lens L408, and a concave surface on the object side It consists of a negative meniscus lens L409 and a biconvex lens L410.
また、第２実施例において、最終レンズ群ＧＬの物体側に凸面を向けた負メニスカスレンズＬ４０７と両凸レンズＬ４０８との接合レンズを、光軸と略直交方向の成分を持つように移動することにより手ブレによる像ブレ補正（防振）を行う。開口絞りＳ及び固定絞りＦＳは、最終レンズ群ＧＬ内に位置し、広角端から望遠端への変倍時に際して最終レンズ群ＧＬと一体に移動するよう構成されている。 In the second embodiment, the cemented lens of the negative meniscus lens L407 having a convex surface facing the object side of the final lens group GL and the biconvex lens L408 is moved so as to have a component substantially orthogonal to the optical axis. Perform image stabilization (anti-vibration) due to camera shake. The aperture stop S and the fixed stop FS are located in the final lens group GL, and are configured to move together with the final lens group GL at the time of zooming from the wide angle end to the telephoto end.
以下の表４に、第２実施例の諸元の値を掲げる。 Table 4 below lists values of specifications of the second embodiment.
（表４）
広角端 中間焦点距離 望遠端
f = 56.500 〜 105.000 〜 292.001
F.NO = 2.880 〜 3.400 〜 4.120
２ω = 43.378 〜 23.079 〜 8.363
像高 = 21.600 〜 21.600 〜 21.600
全長 =231.598 〜 253.524 〜 288.599
Bf = 38.468 〜 53.240 〜 77.319
面番号 曲率半径 面間隔 屈折率 アッベ数
1 140.474 2.000 1.903660 31.27
2 79.683 7.833 1.497820 82.56
3 260.963 0.100
4 128.558 6.460 1.497820 82.56
5 2025.998 0.100
6 94.283 8.417 1.497820 82.56
7 -3186.206 (d1)
8 178.910 1.800 1.841402 43.57
9 32.757 8.999
10 -56.796 1.400 1.487490 70.23
11 42.117 6.500 1.846660 23.78
12 -353.422 4.770
13 -44.732 1.400 1.804000 46.57
14 -117.057 (d2)
15 162.650 1.400 1.870755 33.03
16 60.623 7.028 1.617556 63.57
17 -141.700 0.100
18 111.034 4.084 1.754999 52.31
19 -858.409 (d3)
20 41.427 5.758 1.593190 67.90
21 135.638 0.100
22 36.182 5.277 1.497820 82.56
23 92.181 1.400 1.839503 33.04
24 33.111 6.400
25 0.000 3.400 開口絞りＳ
26 -90.593 1.400 1.767090 42.02
27 51.340 3.521 1.540770 67.69
28 167.473 0.100
29 39.527 6.473 1.487490 70.23
30 -128.351 10.253
31 372.055 1.400 1.874446 35.06
32 25.533 6.973 1.764710 26.31
33 -104.750 5.501
34 0.000 10.659 固定絞りＦＳ
35 -23.739 1.400 1.867859 31.59
36 -50.530 0.100
37 72.209 3.493 1.558700 66.97
38 -281.869 (Bf)
［レンズ群焦点距離］
レンズ群 始面 焦点距離
第１レンズ群 1 119.801
第２レンズ群 8 -30.692
第３レンズ群 15 76.387
最終レンズ群 20 275.133
(Table 4)
Wide angle end Intermediate focal length Telephoto end
f = 56.500 to 105.000 to 292.001
F.NO = 2.880 to 3.400 to 4.120
2ω = 43.378 to 23.079 to 8.363
Image height = 21.600 to 21.600 to 21.600
Total length = 231.598 to 253.524 to 288.599
Bf = 38.468 to 53.240 to 77.319
Surface number Curvature radius Surface spacing Refractive index Abbe number
1 140.474 2.000 1.903660 31.27
2 79.683 7.833 1.497820 82.56
3 260.963 0.100
4 128.558 6.460 1.497820 82.56
5 2025.998 0.100
6 94.283 8.417 1.497820 82.56
7 -3186.206 (d1)
8 178.910 1.800 1.841402 43.57
9 32.757 8.999
10 -56.796 1.400 1.487490 70.23
11 42.117 6.500 1.846660 23.78
12 -353.422 4.770
13 -44.732 1.400 1.804000 46.57
14 -117.057 (d2)
15 162.650 1.400 1.870755 33.03
16 60.623 7.028 1.617556 63.57
17 -141.700 0.100
18 111.034 4.084 1.754999 52.31
19 -858.409 (d3)
20 41.427 5.758 1.593190 67.90
21 135.638 0.100
22 36.182 5.277 1.497820 82.56
23 92.181 1.400 1.839503 33.04
24 33.111 6.400
25 0.000 3.400 Aperture stop S
26 -90.593 1.400 1.767090 42.02
27 51.340 3.521 1.540770 67.69
28 167.473 0.100
29 39.527 6.473 1.487490 70.23
30 -128.351 10.253
31 372.055 1.400 1.874446 35.06
32 25.533 6.973 1.764710 26.31
33 -104.750 5.501
34 0.000 10.659 Fixed aperture FS
35 -23.739 1.400 1.867859 31.59
36 -50.530 0.100
37 72.209 3.493 1.558700 66.97
38 -281.869 (Bf)
[Lens focal length]
Lens group Start surface Focal length
Second lens group 8 -30.692
この第２実施例において、第１レンズ群Ｇ１と第２レンズ群Ｇ２との軸上空気間隔ｄ１、第２レンズ群Ｇ２と第３レンズ群Ｇ３との軸上空気間隔ｄ２、及び、第３レンズ群Ｇ３と最終レンズ群ＧＬとの軸上空気間隔ｄ３は変倍に際して変化する。次の表５に、この第２実施例に係る変倍光学系ＺＬ２の広角端状態、中間焦点距離状態、望遠端状態の各焦点距離における可変間隔データを示す。 In the second embodiment, the axial air gap d1 between the first lens group G1 and the second lens group G2, the axial air gap d2 between the second lens group G2 and the third lens group G3, and the third lens The axial air distance d3 between the group G3 and the final lens group GL changes upon zooming. Table 5 below shows variable interval data at each focal length in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system ZL2 according to the second example.
（表５）
広角端 中間焦点距離 望遠端
d1 2.000 25.003 49.695
d2 46.417 30.945 2.400
d3 8.715 8.337 23.186
(Table 5)
Wide angle end Intermediate focal length Telephoto end
d1 2.000 25.003 49.695
d2 46.417 30.945 2.400
d3 8.715 8.337 23.186
次の表６に、この第２実施例における条件式対応値を示す。 Table 6 below shows values corresponding to the conditional expressions in the second embodiment.
（表６）
（１）ｆｔ／（−ｆ２）＝9.51
（２）ｆｗ／ｆ１＝0.47
（３）ｆ１／（−ｆ２）＝3.90
（４）ｆｔ／ｆ３＝3.82
(Table 6)
(1) ft / (− f2) = 9.51
(2) fw / f1 = 0.47
(3) f1 / (− f2) = 3.90
(4) ft / f3 = 3.82
この第２実施例の広角端状態での無限遠合焦状態の収差図を図４（ａ）に、中間焦点距離状態での無限遠合焦状態の収差図を図４（ｂ）に、望遠端状態での無限遠合焦状態の収差図を図４（ｃ）にそれぞれ示す。これらの各収差図から明らかなように、第２実施例では、広角端状態から望遠端状態までの各焦点距離状態において諸収差が良好に補正され、優れた光学性能を有することがわかる。 FIG. 4A shows an aberration diagram in the infinite focus state in the wide-angle end state of this second embodiment, and FIG. 4B shows an aberration diagram in the infinite focus state in the intermediate focal length state. FIG. 4C shows aberration diagrams in the infinitely focused state in the end state. As is apparent from these respective aberration diagrams, in the second example, it is understood that various aberrations are satisfactorily corrected in each focal length state from the wide-angle end state to the telephoto end state, and excellent optical performance is obtained.
〔参考例〕
図５は、参考例に係る変倍光学系ＺＬ３の構成を示す図である。この図５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Ｌ１０１と物体側に凸面を向けた正メニスカスレンズＬ１０２との接合レンズ、両凸レンズＬ１０３、及び、物体側に凸面を向けた正メニスカスレンズＬ１０４から構成されている。第２レンズ群Ｇ２は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ２０１、両凹レンズＬ２０２と両凸レンズＬ２０３との接合レンズ、及び、両凹レンズＬ２０４から構成されている。第３レンズ群Ｇ３は、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ３０１と両凸レンズＬ３０２との接合レンズ、及び、物体側に凸面を向けた正メニスカスレンズＬ３０３から構成されている。第４レンズ群Ｇ４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Ｌ４０１と物体側に凸面を向けた負メニスカスレンズＬ４０２との接合レンズ、物体側に凸面を向けた負メニスカスレンズＬ４０３と物体側に凸面を向けた正メニスカスレンズＬ４０４との接合レンズ、物体側に凹面を向けた正メニスカスレンズＬ４０５と両凹レンズＬ４０６との接合レンズ、及び、物体側に凹面を向けた負メニスカスレンズＬ４０７から構成されている。最終レンズ群ＧＬは、物体側から順に、両凸レンズＬ５０１、両凸レンズＬ５０２、及び、物体側に凹面を向けた負メニスカスレンズＬ５０３から構成され、最終レンズ群ＧＬの最も像側に位置する負メニスカスレンズＬ５０３は、物体側の面を非球面形状とした非球面レンズである。
[ Reference example ]
FIG. 5 is a diagram showing a configuration of the variable magnification optical system ZL3 according to the reference example . In the variable magnification optical system ZL3 of FIG. 5, the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L101 having a convex surface facing the object side and a positive meniscus lens L102 having a convex surface facing the object side. , A biconvex lens L103, and a positive meniscus lens L104 having a convex surface facing the object side. The second lens group G2 includes, in order from the object side, a negative meniscus lens L201 having a convex surface directed toward the object side, a cemented lens of a biconcave lens L202 and a biconvex lens L203, and a biconcave lens L204. The third lens group G3 includes, in order from the object side, a cemented lens of a negative meniscus lens L301 having a convex surface facing the object side and a biconvex lens L302, and a positive meniscus lens L303 having a convex surface facing the object side. . The fourth lens group G4 includes, in order from the object side, a cemented lens of a positive meniscus lens L401 having a convex surface directed toward the object side and a negative meniscus lens L402 having a convex surface directed toward the object side, and a negative meniscus lens having a convex surface directed toward the object side. A cemented lens of L403 and a positive meniscus lens L404 having a convex surface facing the object side, a cemented lens of a positive meniscus lens L405 having a concave surface facing the object side and a biconcave lens L406, and a negative meniscus lens having a concave surface facing the object side L407. The final lens group GL includes, in order from the object side, a biconvex lens L501, a biconvex lens L502, and a negative meniscus lens L503 having a concave surface facing the object side, and is located at the most image side of the final lens group GL. L503 is an aspheric lens having an aspheric surface on the object side.
また、参考例において、第４レンズ群Ｇ４の物体側に凹面を向けた正メニスカスレンズＬ４０５と両凹レンズＬ４０６との接合レンズを、光軸と略直交方向の成分を持つように移動することにより手ブレによる像ブレ補正（防振）を行う。開口絞りＳは、第３レンズ群Ｇ３と第４レンズ群Ｇ４との間に位置し、広角端から望遠端への変倍時に際して第４レンズ群Ｇ４と一体に移動するよう構成されている。 Further, in the reference example , by moving the cemented lens of the positive meniscus lens L405 having a concave surface facing the object side of the fourth lens group G4 and the biconcave lens L406 so as to have a component substantially perpendicular to the optical axis, Performs image blur correction (anti-vibration) due to blur. The aperture stop S is located between the third lens group G3 and the fourth lens group G4, and is configured to move integrally with the fourth lens group G4 at the time of zooming from the wide angle end to the telephoto end.
参考例において、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κ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。なお、２次の非球面係数Ａ2は０である。また、参考例の表中において、非球面には面番号の左側に＊印を付している。 In the reference example , the height of the aspheric surface in the direction perpendicular to the optical axis is y, and the distance (sag amount) along the optical axis from the tangential plane of the apex of each aspheric surface to each aspheric surface at the height y. When S (y) is assumed, the radius of curvature of the reference sphere (paraxial radius of curvature) is r, the conic constant is κ, and the nth-order aspherical coefficient is An, the following equation (a) is obtained. In the following examples, “E-n” represents “× 10-n”. The secondary aspheric coefficient A2 is zero. In the table of reference examples , an aspherical surface is marked with * on the left side of the surface number.
Ｓ（ｙ）＝（ｙ2／ｒ）／｛１＋（１−κ×ｙ2／ｒ2）1/2｝
＋Ａ4×ｙ4＋Ａ6×ｙ6＋Ａ8×ｙ8＋Ａ10×ｙ10＋Ａ12×ｙ12 （ａ）
S (y) = (y 2 / r) / {1+ (1−κ × y 2 / r 2 ) 1/2 }
+ A4 × y 4 + A6 × y 6 + A8 × y 8 + A10 × y 10 + A12 × y 12 (a)
以下の表７に、この参考例の諸元の値を掲げる。 Table 7 below lists values of specifications of this reference example .
（表７）
広角端 中間焦点距離 望遠端
f = 56.004 〜 105.009 〜 292.021
F.NO = 2.881 〜 3.401 〜 4.202
２ω = 42.802 〜 22.694 〜 8.259
像高 = 21.600 〜 21.600 〜 21.600
全長 =230.356 〜 245.883 〜 262.517
Bf = 43.915 〜 52.453 〜 77.673
面番号 曲率半径 面間隔 屈折率 アッベ数
1 206.228 2.000 1.817480 31.92
2 86.624 8.143 1.497820 82.56
3 342.767 0.100
4 107.170 9.104 1.497820 82.56
5 -1122.386 0.100
6 75.607 9.555 1.497820 82.56
7 551.908 (d1)
8 319.957 1.800 1.851531 42.83
9 37.975 7.287
10 -76.502 1.200 1.504907 69.32
11 44.714 6.169 1.846660 23.78
12 -488.188 3.276
13 -52.547 1.200 1.607244 64.88
14 439.316 (d2)
15 117.270 1.400 1.848328 24.26
16 59.454 7.984 1.634963 61.58
17 -95.004 0.100
18 142.228 2.663 1.731454 53.70
19 384.676 (d3)
20 0.000 0.100 開口絞りＳ
21 24.788 9.999 1.497820 82.56
22 1185.129 1.400 1.795613 47.57
23 80.943 0.100
24 32.664 1.400 1.809880 46.20
25 15.545 9.098 1.497820 82.56
26 80.685 2.588
27 -1171.563 4.900 1.815973 26.05
28 -27.372 1.400 1.754998 52.32
29 42.486 3.966
30 -40.476 1.200 1.882997 40.76
31 -97.641 (d4)
32 126.071 4.310 1.487490 70.23
33 -45.723 0.100
34 86.967 4.655 1.487490 70.23
35 -47.401 1.288
*36 -31.406 1.400 1.882997 40.76
37 -81.993 (Bf)
［レンズ群焦点距離］
レンズ群 始面 焦点距離
第１レンズ群 1 105.457
第２レンズ群 8 -30.505
第３レンズ群 15 74.632
第４レンズ群 20 -148.321
最終レンズ群 32 71.259
(Table 7)
Wide angle end Intermediate focal length Telephoto end
f = 56.004 to 105.009 to 292.021
F.NO = 2.881 to 3.401 to 4.202
2ω = 42.802-22.694-8.259
Image height = 21.600 to 21.600 to 21.600
Total length = 230.356 to 245.883 to 262.517
Bf = 43.915 to 52.453 to 77.673
Surface number Curvature radius Surface spacing Refractive index Abbe number
1 206.228 2.000 1.817480 31.92
2 86.624 8.143 1.497820 82.56
3 342.767 0.100
4 107.170 9.104 1.497820 82.56
5 -1122.386 0.100
6 75.607 9.555 1.497820 82.56
7 551.908 (d1)
8 319.957 1.800 1.851531 42.83
9 37.975 7.287
10 -76.502 1.200 1.504907 69.32
11 44.714 6.169 1.846660 23.78
12 -488.188 3.276
13 -52.547 1.200 1.607244 64.88
14 439.316 (d2)
15 117.270 1.400 1.848328 24.26
16 59.454 7.984 1.634963 61.58
17 -95.004 0.100
18 142.228 2.663 1.731454 53.70
19 384.676 (d3)
20 0.000 0.100 Aperture stop S
21 24.788 9.999 1.497820 82.56
22 1185.129 1.400 1.795613 47.57
23 80.943 0.100
24 32.664 1.400 1.809880 46.20
25 15.545 9.098 1.497820 82.56
26 80.685 2.588
27 -1171.563 4.900 1.815973 26.05
28 -27.372 1.400 1.754998 52.32
29 42.486 3.966
30 -40.476 1.200 1.882997 40.76
31 -97.641 (d4)
32 126.071 4.310 1.487490 70.23
33 -45.723 0.100
34 86.967 4.655 1.487490 70.23
35 -47.401 1.288
* 36 -31.406 1.400 1.882997 40.76
37 -81.993 (Bf)
[Lens focal length]
Lens group Start surface Focal length
Second lens group 8 -30.505
Fourth lens group 20 -148.321
この参考例において、第３６面のレンズ面は非球面形状に形成されている。次の表８に、非球面のデータ、すなわち円錐定数κ及び各非球面定数Ａ4〜Ａ12の値を示す。 In this reference example , the thirty-sixth lens surface is formed in an aspherical shape. Table 8 below shows the aspheric data, that is, the values of the conic constant κ and the aspheric constants A4 to A12.
（表８）
κ Ａ4 Ａ6 Ａ8 Ａ10 Ａ12
第36面 1.0000 -1.72E-06 2.75E-09 0.00E+00 0.00E+00 0.00E+00
(Table 8)
κ A4 A6 A8 A10 A12
36th surface 1.0000 -1.72E-06 2.75E-09 0.00E + 00 0.00E + 00 0.00E + 00
この参考例において、第１レンズ群Ｇ１と第２レンズ群Ｇ２との軸上空気間隔ｄ１、第２レンズ群Ｇ２と第３レンズ群Ｇ３との軸上空気間隔ｄ２、第３レンズ群Ｇ３と第４レンズ群Ｇ４との軸上空気間隔ｄ３、及び、第４レンズ群Ｇ４と最終レンズ群ＧＬとの軸上空気間隔ｄ４は変倍に際して変化する。次の表に、この参考例に係る変倍光学系ＺＬ３の広角端状態、中間焦点距離状態、望遠端状態の各焦点距離における可変間隔データを示す。 In this reference example , the axial air gap d1 between the first lens group G1 and the second lens group G2, the axial air gap d2 between the second lens group G2 and the third lens group G3, and the third lens group G3 and the third lens group G3. The axial air distance d3 between the fourth lens group G4 and the axial air distance d4 between the fourth lens group G4 and the final lens group GL change during zooming. The following table shows variable interval data at each focal length in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system ZL3 according to this reference example .
（表９）
広角端 中間焦点距離 望遠端
d1 2.000 22.429 39.643
d2 55.374 37.557 2.400
d3 10.914 18.914 31.416
d4 8.169 4.546 1.400
(Table 9)
Wide angle end Intermediate focal length Telephoto end
d1 2.000 22.429 39.643
d2 55.374 37.557 2.400
d3 10.914 18.914 31.416
d4 8.169 4.546 1.400
次の表１０に、この参考例における条件式対応値を示す。 Table 10 below shows values corresponding to the conditional expressions in this reference example .
（表１０）
（１）ｆｔ／（−ｆ２）＝9.57
（２）ｆｗ／ｆ１＝0.53
（３）ｆ１／（−ｆ２）＝3.46
（４）ｆｔ／ｆ３＝3.91
(Table 10)
(1) ft / (− f2) = 9.57
(2) fw / f1 = 0.53
(3) f1 / (− f2) = 3.46
(4) ft / f3 = 3.91
この参考例の広角端状態での無限遠合焦状態の収差図を図６（ａ）に、中間焦点距離状態での無限遠合焦状態の収差図を図６（ｂ）に、望遠端状態での無限遠合焦状態の収差図を図６（ｃ）にそれぞれ示す。これらの各収差図から明らかなように、参考例では、広角端状態から望遠端状態までの各焦点距離状態において諸収差が良好に補正され、優れた光学性能を有することがわかる。 FIG. 6A shows an aberration diagram in the infinite focus state in the wide-angle end state of this reference example , and FIG. 6B shows an aberration diagram in the infinite focus state in the intermediate focal length state, in the telephoto end state. FIG. 6 (c) shows aberration diagrams in the infinitely focused state at. As can be seen from these respective aberration diagrams, in the reference example , various aberrations are satisfactorily corrected in each focal length state from the wide-angle end state to the telephoto end state, and excellent optical performance is obtained.
ＺＬ（ＺＬ１〜ＺＬ３） 変倍光学系
Ｇ１ 第１レンズ群 Ｇ２ 第２レンズ群 Ｇ３ 第３レンズ群
ＧＬ 最終レンズ群
１ デジタル一眼レフカメラ（光学機器）
ZL (ZL1 to ZL3) Variable magnification optical system G1 First lens group G2 Second lens group G3 Third lens group GL
Claims (4)
正の屈折力を有する第１レンズ群と、
負の屈折力を有する第２レンズ群と、
正の屈折力を有する第３レンズ群と、
正の屈折力を有する第４レンズ群と、を有し、
広角端状態から望遠端状態に変倍する際に、前記第１レンズ群と前記第２レンズ群との間隔が増大し、前記第２レンズ群と前記第３レンズ群との間隔が減少し、前記第３レンズ群と前記第４レンズ群との間隔が一旦減少した後増大し、
前記第３レンズ群の少なくとも一部は、光軸に沿って移動することにより無限遠から近距離物体までの合焦を行い、
望遠端状態での全系の焦点距離をｆｔとし、広角端状態での全系の焦点距離をｆｗとし、前記第１レンズ群の焦点距離をｆ１とし、前記第２レンズ群の焦点距離をｆ２としたとき、次式
８．８０ ＜ ｆｔ／（−ｆ２） ＜ １２．００
０．４０ ＜ ｆｗ／ｆ１ ＜ ０．６０
２．００ ＜ ｆ１／（−ｆ２） ＜ ４．８０
の条件を満足する変倍光学系。 From the object side,
A first lens group having a positive refractive power;
A second lens group having negative refractive power;
A third lens group having positive refractive power;
A fourth lens group having a positive refractive power,
When zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the third lens group decreases. The distance between the third lens group and the fourth lens group decreases once and then increases;
At least a part of the third lens group performs focusing from infinity to a close object by moving along the optical axis,
The focal length of the entire system in the telephoto end state is ft, the focal length of the entire system in the wide-angle end state is fw, the focal length of the first lens group is f1, and the focal length of the second lens group is f2. Then, the following formula 8.80 <ft / (− f2) <12.00
0.40 <fw / f1 <0.60
2.00 <f1 / (− f2) <4.80
Variable magnification optical system that satisfies the above conditions.
２．５０ ＜ ｆｔ／ｆ３ ＜ ４．５０
の条件を満足する請求項１または２に記載の変倍光学系。 When the focal length of the third lens group is f3, the following formula 2.50 <ft / f3 <4.50
The zoom optical system according to claim 1 , wherein the zoom lens system satisfies the following condition.
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