JP2008176271A - Variable power optical system having vibration-proof function, imaging device, and method of varying magnification of variable power optical system - Google Patents

Variable power optical system having vibration-proof function, imaging device, and method of varying magnification of variable power optical system Download PDF

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JP2008176271A
JP2008176271A JP2007177540A JP2007177540A JP2008176271A JP 2008176271 A JP2008176271 A JP 2008176271A JP 2007177540 A JP2007177540 A JP 2007177540A JP 2007177540 A JP2007177540 A JP 2007177540A JP 2008176271 A JP2008176271 A JP 2008176271A
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lens group
lens
optical system
image
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JP5358902B2 (en
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Satoru Shibata
悟 柴田
Hiroshi Yamamoto
浩史 山本
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Nikon Corp
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Nikon Corp
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Priority to US12/303,305 priority patent/US20090231708A1/en
Priority to PCT/JP2007/064300 priority patent/WO2008010563A1/en
Priority to CN200780027520XA priority patent/CN101490594B/en
Priority to EP07791042A priority patent/EP2045639A4/en
Priority to CN2012100553814A priority patent/CN102608736A/en
Publication of JP2008176271A publication Critical patent/JP2008176271A/en
Priority to US13/090,936 priority patent/US20110194191A1/en
Priority to US13/545,651 priority patent/US20120275032A1/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable power optical system having a vibration-proof function for correcting the blur of a photographic image caused by vibration or camera shake though it has a high ratio of magnification variation and excellent optical performance, and also to provide an imaging device, and a method of varying the magnification of the variable power optical system. <P>SOLUTION: The variable power optical system has, in the order from an object side, a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, a third lens group G3 having negative refractive power, and a fourth lens group G4 having positive refractive power. When the magnification is varied from a wide-angle end state to a tele end state, the distance between the second lens group G2 and the third lens group G3 increases, and the distance between the third lens group G3 and the fourth lens group G4 decreases, and the whole of or a part of the third lens group G3 is shifted in a direction orthogonal to an optical axis as a vibration-proof lens group, whereby image surface is corrected when image blur occurs. The variable power optical system satisfies a predetermined conditional expression. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、写真用カメラや電子スチルカメラ、ビデオカメラ等に適した防振機能を有する変倍光学系、撮像装置、変倍光学系の変倍方法に関する。   The present invention relates to a variable magnification optical system, an imaging apparatus, and a variable magnification method for a variable magnification optical system having an image stabilization function suitable for a photographic camera, an electronic still camera, a video camera, and the like.

従来、写真用カメラや電子スチルカメラ、ビデオカメラ等に適した防振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）。
特開平１１−１７４３２９号公報 Conventionally, a variable power optical system having an image stabilization function suitable for a photographic camera, an electronic still camera, a video camera, or the like has been proposed (for example, Patent Document 1).
JP-A-11-174329

しかしながら、従来の防振機能を有する変倍光学系では、変倍比が２倍程度であるため、高変倍化の要求に十分満足できるものではないという問題があった。   However, the conventional variable magnification optical system having a vibration isolation function has a problem that the variable magnification ratio is about two times, so that it cannot satisfy the requirement for high magnification.

本発明は、上記問題点に鑑みてなされたものであり、高変倍比と良好な光学性能を持ちながら、振動や手ブレ等による撮影画像のブレを補正する防振機能を有する変倍光学系の提供を目的とする。   The present invention has been made in view of the above-mentioned problems, and has a high zoom ratio and good optical performance, and has a zooming function having a vibration isolating function for correcting blur of a photographed image due to vibration, camera shake, or the like. The purpose is to provide a system.

上記課題を解決するために、本発明は、物体側から順に、負の屈折力を持つ第１レンズ群と、正の屈折力を持つ第２レンズ群と、負の屈折力を持つ第３レンズ群と、正の屈折力を持つ第４レンズ群を有し、広角端状態から望遠端状態まで変倍を行う際に、前記第２レンズ群と前記第３レンズ群との間隔が増大し、前記第３レンズ群と前記第４レンズ群との間隔が減少し、前記第３レンズ群全体もしくは一部を防振レンズ群として光軸と直交する方向にシフトさせることによって像ブレ発生時の像面補正を行い、さらに下記条件式（１）、および（２）を満足することを特徴とした防振機能を有する変倍光学系を提供する。
（１） ０．１２＜(ｒ２＋ｒ１)／(ｒ２−ｒ１)＜１．３０
（２） １．２０＜｜ｆｖｒ／ｆｗ｜＜３．３０
ただし、
ｒ１：前記防振レンズ群の物体側の曲率半径
ｒ２：前記防振レンズ群の像面側の曲率半径
ｆｖｒ：前記防振レンズ群の焦点距離
ｆｗ：広角端状態での全系焦点距離 In order to solve the above-described problems, the present invention provides, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens having a negative refractive power. And a fourth lens group having a positive refractive power, and when performing zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group increases. The distance between the third lens group and the fourth lens group is reduced, and the whole or part of the third lens group is shifted as a vibration-proof lens group in a direction perpendicular to the optical axis, thereby generating an image at the time of image blurring. Provided is a variable magnification optical system having an image stabilization function characterized in that surface correction is performed and the following conditional expressions (1) and (2) are satisfied.
(1) 0.12 <(r2 + r1) / (r2-r1) <1.30
(2) 1.20 <| fvr / fw | <3.30
However,
r1: radius of curvature of the image stabilizing lens group on the object side r2: radius of curvature of the image stabilizing side of the image stabilizing lens group fvr: focal length of the image stabilizing lens group fw: focal length of the entire system in the wide-angle end state

また、本発明は、物体側から順に、負の屈折力を持つ第１レンズ群と、正の屈折力を持つ第２レンズ群と、負の屈折力を持つ第３レンズ群と、正の屈折力を持つ第４レンズ群を有し、広角端状態から望遠端状態まで変倍を行う際に、前記第２レンズ群と前記第３レンズ群との間隔が増大し、前記第３レンズ群と前記第４レンズ群との間隔が減少し、前記第３レンズ群全体もしくは一部を防振レンズ群として光軸と直交する方向にシフトさせることによって像ブレ発生時の像面補正を行い、さらに下記条件式（１）、および（３）を満足することを特徴とした防振機能を有する変倍光学系を提供する。
（１） ０．１２＜(ｒ２＋ｒ１)／(ｒ２−ｒ１)＜１．３０
（３） ０．５０＜｜ｆｖｒ／ｆ２｜＜２．３０
ただし、
ｒ１：前記防振レンズ群の物体側の曲率半径
ｒ２：前記防振レンズ群の像面側の曲率半径
ｆｖｒ：前記防振レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離 Further, according to the present invention, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a positive refraction. And a fourth lens group having power, and when zooming from the wide-angle end state to the telephoto end state, an interval between the second lens group and the third lens group increases, and the third lens group The distance from the fourth lens group is reduced, and the whole or a part of the third lens group is shifted as a vibration-proof lens group in a direction orthogonal to the optical axis to perform image plane correction when an image blur occurs, Provided is a variable magnification optical system having an anti-vibration function characterized by satisfying the following conditional expressions (1) and (3).
(1) 0.12 <(r2 + r1) / (r2-r1) <1.30
(3) 0.50 <| fvr / f2 | <2.30
However,
r1: radius of curvature of the image stabilizing lens group on the object side r2: radius of curvature of the image stabilizing side of the image stabilizing lens group fvr: focal length of the image stabilizing lens group f2: focal length of the second lens group

また、本発明は、本発明に係る防振機能を有する変倍光学系を備えた撮像装置を提供する。   In addition, the present invention provides an imaging apparatus including a variable magnification optical system having a vibration isolation function according to the present invention.

また、本発明は、物体側から順に、負の屈折力を持つ第１レンズ群と、正の屈折力を持つ第２レンズ群と、負の屈折力を持つ第３レンズ群と、正の屈折力を持つ第４レンズ群を有する防振機能を有する変倍光学系の変倍方法において、
広角端状態から望遠端状態まで変倍を行う際に、前記第２レンズ群と前記第３レンズ群との間隔が増大し、前記第３レンズ群と前記第４レンズ群との間隔が減少し、前記第３レンズ群全体もしくは一部を防振レンズ群として光軸と直交する方向にシフトさせることによって像ブレ発生時の像面補正を行い、さらに下記条件式（１）、（２）を満足することを特徴とする防振機能を有する変倍光学系の変倍方法を提供する。
（１） ０．１２＜（ｒ２+ｒ１）／（ｒ２-ｒ１）＜１．３０
（２） １．２０＜｜ｆｖｒ／ｆｗ｜＜３．３０
ただし、
ｒ１：前記防振レンズ群の物体側の曲率半径
ｒ２：前記防振レンズ群の像面側の曲率半径
ｆｖｒ：前記防振レンズ群の焦点距離
ｆｗ：広角端状態での全系の焦点距離 Further, according to the present invention, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a positive refraction. In the zooming method of the zooming optical system having the image stabilization function having the fourth lens group having the power,
When zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group increases, and the distance between the third lens group and the fourth lens group decreases. The entire third lens group or a part of the third lens group is shifted in the direction orthogonal to the optical axis as an anti-vibration lens group to correct the image plane when an image blur occurs, and the following conditional expressions (1) and (2) A zooming method for a zooming optical system having an image stabilization function characterized by being satisfied is provided.
(1) 0.12 <(r2 + r1) / (r2-r1) <1.30
(2) 1.20 <| fvr / fw | <3.30
However,
r1: radius of curvature of the image stabilizing lens group on the object side r2: radius of curvature of the image stabilizing side of the image stabilizing lens group fvr: focal length of the image stabilizing lens group fw: focal length of the entire system in the wide-angle end state

また、本発明は、物体側から順に、負の屈折力を持つ第１レンズ群と、正の屈折力を持つ第２レンズ群と、負の屈折力を持つ第３レンズ群と、正の屈折力を持つ第４レンズ群を有する防振機能を有する変倍光学系の変倍方法において、
広角端状態から望遠端状態まで変倍を行う際に、前記第２レンズ群と前記第３レンズ群との間隔が増大し、前記第３レンズ群と前記第４レンズ群との間隔が減少し、前記第３レンズ群全体もしくは一部を防振レンズ群として光軸と直交する方向にシフトさせることによって像ブレ発生時の像面補正を行い、さらに下記条件式（１）、（３）を満足することを特徴とした防振機能を有する変倍光学系の変倍方法を提供する。
（１） ０．１２＜（ｒ２+ｒ１）／（ｒ２-ｒ１）＜１．３
（３） ０．５０＜｜ｆｖｒ／ｆ２｜＜２．３０
ただし、
ｒ１：前記防振レンズ群の物体側の曲率半径
ｒ２：前記防振レンズ群の像面側の曲率半径
ｆｖｒ：前記防振レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離 Further, according to the present invention, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a positive refraction. In the zooming method of the zooming optical system having the image stabilization function having the fourth lens group having the power,
When zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group increases, and the distance between the third lens group and the fourth lens group decreases. The entire third lens group or a part of the third lens group is shifted as a vibration-proof lens group in the direction orthogonal to the optical axis to correct the image plane when an image blur occurs, and the following conditional expressions (1) and (3) A zooming method for a zooming optical system having an image stabilization function characterized by being satisfied is provided.
(1) 0.12 <(r2 + r1) / (r2-r1) <1.3
(3) 0.50 <| fvr / f2 | <2.30
However,
r1: radius of curvature of the image stabilizing lens group on the object side r2: radius of curvature of the image stabilizing side of the image stabilizing lens group fvr: focal length of the image stabilizing lens group f2: focal length of the second lens group

本発明によれば、高変倍比を有し、良好な光学性能を持ちながら、振動や手ブレ等による撮影画像のブレを補正する防振機能を有する変倍光学系、撮像装置、変倍光学系の変倍方法を提供することができる。   According to the present invention, a variable power optical system, an image pickup apparatus, and a variable power zoom lens having a high zoom ratio and a vibration proof function for correcting blur of a photographed image caused by vibration or camera shake while having good optical performance An optical system zooming method can be provided.

以下、本発明の実施形態に係る防振機能を有する変倍光学系について説明する。   Hereinafter, a variable magnification optical system having an image stabilization function according to an embodiment of the present invention will be described.

本防振機能を有する変倍光学系は、物体側から順に、負の屈折力を持つ第１レンズ群と、正の屈折力を持つ第２レンズ群と、負の屈折力を持つ第３レンズ群と、正の屈折力を持つ第４レンズ群を有し、広角端状態から望遠端状態まで変倍を行う際に、第２レンズ群と第３レンズ群との間隔が増大し、第３レンズ群と第４レンズ群との間隔が減少し、第３レンズ群全体もしくは一部を防振レンズ群として光軸と直交する方向に移動させることで、該変倍光学系が振動した際の像ブレを補正し、さらに以下の条件式（１）、および（２）を満足する構成である。
（１） ０．１２＜(ｒ２＋ｒ１)／(ｒ２−ｒ１)＜１．３０
（２） １．２０＜｜ｆｖｒ／ｆｗ｜＜３．３０
ただし、
ｒ１：前記防振レンズ群の物体側の曲率半径
ｒ２：前記防振レンズ群の像面側の曲率半径
ｆｖｒ：前記防振レンズ群の焦点距離
ｆｗ：広角端状態での全系の焦点距離 The variable magnification optical system having the image stabilization function includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens having a negative refractive power. And a fourth lens group having a positive refractive power, and when performing zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group increases. When the distance between the lens group and the fourth lens group is reduced, and the whole or a part of the third lens group is moved as a vibration-proof lens group in a direction perpendicular to the optical axis, the zoom optical system is vibrated. The image blur is corrected, and the following conditional expressions (1) and (2) are satisfied.
(1) 0.12 <(r2 + r1) / (r2-r1) <1.30
(2) 1.20 <| fvr / fw | <3.30
However,
r1: radius of curvature of the image stabilizing lens group on the object side r2: radius of curvature of the image stabilizing side of the image stabilizing lens group fvr: focal length of the image stabilizing lens group fw: focal length of the entire system in the wide-angle end state

条件式（１）は、防振レンズ群の形状を規定したものであり、これによって所定の高変倍比を効果的に確保しつつ、良好な光学性能を確保しながら、防振時にも良好な光学性能を実現している。   Conditional expression (1) defines the shape of the anti-vibration lens group, thereby effectively ensuring a predetermined high zoom ratio, ensuring good optical performance, and good during anti-vibration Realizes excellent optical performance.

条件式（１）の下限値を下回ると、偏心コマ収差変動が大きくなり、防振効果が小さくなるか、パワーが弱くなり、高変倍比を確保できなくなる。また、条件式（１）の上限値を超えると、変倍時の球面収差補正が困難になる。   If the lower limit value of conditional expression (1) is not reached, the fluctuation of the decentration coma aberration becomes large, and the anti-vibration effect becomes small or the power becomes weak, and a high zoom ratio cannot be secured. If the upper limit of conditional expression (1) is exceeded, it will be difficult to correct spherical aberration during zooming.

なお、本発明の効果を確実にするためには、条件式（１）の下限値を０．２５にすることが望ましい。また、本発明の効果を確実にするためには、条件式（１）の上限値を１．００にすることが望ましい。本発明の効果を更に確実にするためには、条件式（１）の下限値を０．３６にすることが望ましい。   In order to secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (1) to 0.25. In order to secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (1) to 1.00. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (1) to 0.36.

条件式（２）は、広角端状態での変倍光学系全系の焦点距離に対する防振レンズ群の焦点距離を規定したものであり、これによって防振時の良好な光学性能を実現している。   Conditional expression (2) defines the focal length of the anti-vibration lens group with respect to the focal length of the entire zooming optical system in the wide-angle end state, and this realizes good optical performance during image stabilization. Yes.

条件式（２）の下限値を下回ると、偏心による像面湾曲収差の変動が大きくなりすぎる。また、上限値を上回ると防振レンズ群のパワーが弱くなりすぎるため、防振効果が小さくなる。その結果、第１レンズ群のパワーが強くなり、球面収差が発生するため好ましくない。   If the lower limit of conditional expression (2) is not reached, the variation in field curvature due to decentration becomes too large. On the other hand, if the value exceeds the upper limit value, the power of the anti-vibration lens group becomes too weak, so that the anti-vibration effect is reduced. As a result, the power of the first lens group becomes strong and spherical aberration occurs, which is not preferable.

なお、本発明の効果を確実にするためには、条件式（２）の下限値を１．６０にすることが望ましい。また、本発明の効果を確実にするためには、条件式（２）の上限値を３．００にすることが望ましい。   In order to secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (2) to 1.60. In order to secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (2) to 3.00.

また、本防振機能を有する変倍光学系は、下記条件式（３）を満足することが望ましい。
（３） ０．５０＜｜ｆｖｒ／ｆ２｜＜２．３０
ただし、
ｆｖｒ：前記防振レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離 Further, it is desirable that the variable magnification optical system having the present image stabilization function satisfies the following conditional expression (3).
(3) 0.50 <| fvr / f2 | <2.30
However,
fvr: focal length of the anti-vibration lens group f2: focal length of the second lens group

条件式（３）は、第２レンズ群の焦点距離に対する防振レンズ群の焦点距離を規定したものであり、これによって防振時の良好な光学性能を実現している。   Conditional expression (3) defines the focal length of the anti-vibration lens group with respect to the focal length of the second lens group, and thereby realizes good optical performance at the time of image stabilization.

条件式（３）の下限値を下回ると、広角端状態から望遠端状態までの変倍の際に、偏心収差(コマ収差、像面湾曲収差)を補正できなくなる。また、上限値を上回ると防振レンズ群のパワーが弱くなり、防振効果が得られなくなる。その結果、第１レンズ群のパワーが強くなり、球面収差が発生するため好ましくない。   If the lower limit of conditional expression (3) is not reached, decentration aberrations (coma aberration and field curvature aberration) cannot be corrected during zooming from the wide-angle end state to the telephoto end state. On the other hand, if the upper limit is exceeded, the power of the anti-vibration lens group becomes weak and the anti-vibration effect cannot be obtained. As a result, the power of the first lens group becomes strong and spherical aberration occurs, which is not preferable.

なお、本発明の効果を確実にするためには、条件式（３）の下限値を１．１０にすることが望ましい。また、本発明の効果を確実にするためには、条件式（３）の上限値を２．００にすることが望ましい。   In order to secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (3) to 1.10. In order to secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (3) to 2.00.

また、本防振機能を有する変倍光学系は、物体側から順に、負の屈折力を持つ第１レンズ群と、正の屈折力を持つ第２レンズ群と、負の屈折力を持つ第３レンズ群と、正の屈折力を持つ第４レンズ群を有し、広角端状態から望遠端状態まで変倍を行う際に、第２レンズ群と第３レンズ群との間隔が増大し、第３レンズ群と第４レンズ群との間隔が減少し、第３レンズ群全体もしくは一部を防振レンズ群として光軸と直交する方向に移動させることで、該変倍光学系が振動した際の像ブレを補正し、さらに以下の条件式（１）、（３）を満足する構成である。
（１） ０．１２＜(ｒ２＋ｒ１)／(ｒ２−ｒ１)＜１．３０
（３） ０．５０＜｜ｆｖｒ／ｆ２｜＜２．３０
ただし、
ｒ１：前記防振レンズ群の物体側の曲率半径
ｒ２：前記防振レンズ群の像面側の曲率半径
ｆｖｒ：防振レンズ群の焦点距離
ｆ２：第２レンズ群の焦点距離 In addition, the variable magnification optical system having the anti-vibration function includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a first lens group having a negative refractive power. When there is a third lens group 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 distance between the second lens group and the third lens group increases. The distance between the third lens group and the fourth lens group is reduced, and the variable magnification optical system vibrates by moving the whole or a part of the third lens group as a vibration-proof lens group in a direction perpendicular to the optical axis. The image blur at the time is corrected, and the following conditional expressions (1) and (3) are satisfied.
(1) 0.12 <(r2 + r1) / (r2-r1) <1.30
(3) 0.50 <| fvr / f2 | <2.30
However,
r1: radius of curvature of the image stabilizing lens group on the object side r2: radius of curvature of the image stabilizing side of the image stabilizing lens group fvr: focal length of the image stabilizing lens group f2: focal length of the second lens group

条件式（１）は、防振レンズ群の形状を規定したものであり、これによって所定の高変倍比を効果的に確保しつつ、良好な光学性能を確保しながら、防振時にも良好な光学性能を実現している。   Conditional expression (1) defines the shape of the anti-vibration lens group, thereby effectively ensuring a predetermined high zoom ratio, ensuring good optical performance, and good during anti-vibration Realizes excellent optical performance.

条件式（１）の下限値を下回ると、偏心コマ収差変動が大きくなり、防振効果が小さくなるか、パワーが弱くなり、高変倍比を確保できなくなる。また、条件式（１）の上限値を超えると、変倍時の球面収差補正が困難になる。   If the lower limit value of conditional expression (1) is not reached, the fluctuation of the decentration coma aberration becomes large, and the anti-vibration effect becomes small or the power becomes weak, and a high zoom ratio cannot be secured. If the upper limit of conditional expression (1) is exceeded, it will be difficult to correct spherical aberration during zooming.

なお、本発明の効果を確実にするためには、条件式（１）の下限値を０．２５にすることが望ましい。また、本発明の効果を確実にするためには、条件式（１）の上限値を１．００にすることが望ましい。本発明の効果を更に確実にするためには、条件式（１）の下限値を０．３６にすることが望ましい。   In order to secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (1) to 0.25. In order to secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (1) to 1.00. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (1) to 0.36.

条件式（３）は、第２レンズ群の焦点距離に対する防振レンズ群の焦点距離を規定したものであり、これによって防振時の良好な光学性能を実現している。   Conditional expression (3) defines the focal length of the anti-vibration lens group with respect to the focal length of the second lens group, and thereby realizes good optical performance at the time of image stabilization.

条件式（３）の下限値を下回ると、広角端状態から望遠端状態までの変倍の際に、偏心収差(コマ収差、像面湾曲収差)を補正できなくなる。また、上限値を上回ると防振レンズ群のパワーが弱くなり、防振効果が得られなくなる。その結果、第１レンズ群のパワーが強くなり、球面収差が発生するため好ましくない。   If the lower limit of conditional expression (3) is not reached, decentration aberrations (coma aberration and field curvature aberration) cannot be corrected during zooming from the wide-angle end state to the telephoto end state. On the other hand, if the upper limit is exceeded, the power of the anti-vibration lens group becomes weak and the anti-vibration effect cannot be obtained. As a result, the power of the first lens group becomes strong and spherical aberration occurs, which is not preferable.

なお、本発明の効果を確実にするためには、条件式（３）の下限値を１．１０、上限値を２．００にすることが望ましい。   In order to secure the effect of the present invention, it is desirable to set the lower limit value of conditional expression (3) to 1.10 and the upper limit value to 2.00.

また、本防振機能を有する変倍光学系では、広角端状態から望遠端状態までの変倍の際、第１レンズ群が像面に向かって凸の軌跡で移動することが望ましい。このような移動を行うことで高い変倍比を達成でき、各レンズ群の移動量を小さくすることができる。   In the zoom optical system having the image stabilization function, it is desirable that the first lens unit moves along a convex locus toward the image plane when zooming from the wide-angle end state to the telephoto end state. By performing such movement, a high zoom ratio can be achieved, and the movement amount of each lens group can be reduced.

また、本防振機能を有する変倍光学系では、最も像面側のレンズ面が像面に向かって凸面となることが望ましい。このように構成することで、像面湾曲が良好に補正でき、像面からの反射光によるゴーストを軽減することが可能となる。   In the variable magnification optical system having the image stabilization function, it is desirable that the lens surface closest to the image surface is convex toward the image surface. With this configuration, the curvature of field can be satisfactorily corrected, and ghosts caused by reflected light from the image plane can be reduced.

また、本防振機能を有する変倍光学系では、第４レンズ群は、像面側より順に負レンズ、正レンズ、および正レンズを有することが望ましい。この構成にすることで、防振レンズ群である第３レンズ群と、第４レンズ群との間隔を確保しつつ、倍率色収差、コマ収差を良好に補正できる。   In the variable magnification optical system having the image stabilization function, it is desirable that the fourth lens group includes a negative lens, a positive lens, and a positive lens in order from the image plane side. With this configuration, it is possible to satisfactorily correct lateral chromatic aberration and coma aberration while ensuring a distance between the third lens group, which is an anti-vibration lens group, and the fourth lens group.

また、本防振機能を有する変倍光学系では、第３レンズ群に接合レンズを有することが望ましい。このような構成にすることで、防振時の倍率色収差を良好に保つことができる。   In the variable magnification optical system having the present image stabilization function, it is desirable to have a cemented lens in the third lens group. By adopting such a configuration, it is possible to maintain good lateral chromatic aberration during image stabilization.

また、本防振機能を有する変倍光学系では、第２レンズ群、第３レンズ群、第４レンズ群に各々接合レンズを有することが望ましい。このような構成にすることで、変倍時の色収差、特に倍率色収差を良好に保つことができる。   In the variable magnification optical system having the present image stabilization function, it is desirable that the second lens group, the third lens group, and the fourth lens group have cemented lenses, respectively. With such a configuration, it is possible to maintain good chromatic aberration during zooming, particularly lateral chromatic aberration.

また、本防振機能を有する変倍光学系では、広角端状態から望遠端状態までの変倍時に、第２レンズ群と第４レンズ群とが一体となって移動することが望ましい。このような構成にすることで、高変倍比を達成しつつ、防振レンズ群で発生するコマ収差、像面湾曲収差等の偏心収差を良好に補正することができる。   In the variable power optical system having the image stabilization function, it is desirable that the second lens group and the fourth lens group move together during zooming from the wide-angle end state to the telephoto end state. With such a configuration, it is possible to satisfactorily correct decentration aberrations such as coma aberration and field curvature aberration generated in the image stabilizing lens group while achieving a high zoom ratio.

また、本防振機能を有する変倍光学系では、開口絞りは、第３レンズ群の近傍に配置され、広角端状態から望遠端状態まで変倍を行う際に、第３レンズ群と一体に移動することが好ましい。ここで、第３レンズ群の近傍とは、第２レンズ群と第３レンズ群との間、第３レンズ群内、および第３レンズ群と第４レンズ群との間を含む範囲を意味する。このような構成にすることで、コマ収差を良好に補正でき、周辺光量の低下を少なくすることができる。   In the variable magnification optical system having the present image stabilization function, the aperture stop is disposed in the vicinity of the third lens group, and is integrated with the third lens group when zooming from the wide-angle end state to the telephoto end state. It is preferable to move. Here, the vicinity of the third lens group means a range including between the second lens group and the third lens group, within the third lens group, and between the third lens group and the fourth lens group. . By adopting such a configuration, coma aberration can be corrected satisfactorily, and a decrease in peripheral light amount can be reduced.

また、本防振機能を有する変倍光学系では、開口絞りは、第２レンズ群の近傍に配置され、広角端状態から望遠端状態まで変倍を行う際に、第２レンズ群と一体に移動することが好ましい。ここで、第２レンズ群の近傍とは第１レンズ群と第２レンズ群の間、第２レンズ群内、および第２レンズ群と第３レンズ群との間を含む範囲を意味する。このような構成にすることで、コマ収差を良好に補正でき、周辺光量の低下を少なくすることができる。   Further, in the variable magnification optical system having the present image stabilization function, the aperture stop is disposed in the vicinity of the second lens group, and is integrated with the second lens group when zooming from the wide-angle end state to the telephoto end state. It is preferable to move. Here, the vicinity of the second lens group means a range including between the first lens group and the second lens group, in the second lens group, and between the second lens group and the third lens group. By adopting such a configuration, coma aberration can be corrected satisfactorily, and a decrease in peripheral light amount can be reduced.

また、本防振機能を有する変倍光学系では、第３レンズ群と第４レンズ群との間に固定絞りを配置することが望ましい。このような構成にすることで、コマフレアをカットし、良好な光学性能を保つことができる。   In the variable magnification optical system having the image stabilization function, it is desirable to dispose a fixed stop between the third lens group and the fourth lens group. With such a configuration, the coma flare can be cut and good optical performance can be maintained.

以下、各数値実施例に係る防振機能を有する変倍光学系を添付図面に基づいて説明する。   Hereinafter, a variable magnification optical system having an image stabilization function according to each numerical example will be described with reference to the accompanying drawings.

（第１実施例）
図１は、第１実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。 (First embodiment)
FIG. 1 is a cross-sectional view showing a lens configuration in a wide-angle end state of a variable magnification optical system having an image stabilization function according to the first example.

第１実施例に係る防振機能を有する変倍光学系は、図１に示すように、物体側から順に、負の屈折力を持つ第１レンズ群Ｇ１、正の屈折力を持つ第２レンズ群Ｇ２、開口絞りＳＰ、負の屈折力を持つ第３レンズ群Ｇ３、および正の屈折力を持つ第４レンズ群Ｇ４で構成されている。   As shown in FIG. 1, the variable power optical system according to the first example includes a first lens group G1 having a negative refractive power and a second lens having a positive refractive power in order from the object side. It includes a group G2, an aperture stop SP, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power.

第１レンズ群Ｇ１は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと、両凹形状の負レンズと、物体側に凸面を向けた正メニスカスレンズとからなり、最も物体側の負メニスカスレンズは像面Ｉ側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。   The first lens group G1 includes, in order from the object side, a negative meniscus lens having a convex surface directed toward the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface directed toward the object side. The negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image plane I side.

第２レンズ群Ｇ２は、物体側から順に、両凸形状の正レンズと、両凸形状の正レンズと像面I側に平面を向けた平凹形状の負レンズとの接合レンズとからなる。   The second lens group G2 is composed of, in order from the object side, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a plano-concave negative lens having a plane facing the image plane I side.

第３レンズ群Ｇ３は、物体側から順に、物体側に凹面を向けた正メニスカスレンズと両凹形状の負レンズとの接合レンズとからなる。   The third lens group G3 is composed of, in order from the object side, a cemented lens of a positive meniscus lens having a concave surface directed toward the object side and a biconcave negative lens.

第４レンズ群Ｇ４は、物体側から順に、物体側に凹面を向けた正メニスカスレンズと、両凸形状の正レンズと像面Ｉ側に凸面を向けた負メニスカスレンズとの接合レンズとからなる。   The fourth lens group G4 includes, in order from the object side, a positive meniscus lens having a concave surface directed toward the object side, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface directed toward the image surface I. .

開口絞りＳＰは、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間に位置し、広角端状態から望遠端状態への変倍の際に、第３レンズ群Ｇ３と伴に移動する。   The aperture stop SP is located between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 when zooming from the wide-angle end state to the telephoto end state.

広角端状態から望遠端状態への変倍の際、第１レンズ群Ｇ１は像面Ｉに向かって凸の軌跡で移動し、第２レンズ群Ｇ２、第４レンズ群Ｇ４は一体に物体側へ移動し、第３レンズ群Ｇ３は物体側に移動する。   During zooming from the wide-angle end state to the telephoto end state, the first lens group G1 moves along a convex locus toward the image plane I, and the second lens group G2 and the fourth lens group G4 are integrally moved toward the object side. The third lens group G3 moves to the object side.

また、本実施例に係る防振機能を有する変倍光学系では、第３レンズ群Ｇ３全体を光軸と直交する方向にシフトさせることで撮影画像のブレを補正している。   Further, in the variable magnification optical system having the image stabilization function according to the present embodiment, the blur of the captured image is corrected by shifting the entire third lens group G3 in the direction orthogonal to the optical axis.

また、本実施例に係る防振機能を有する変倍光学系では、変倍光学系全系の焦点距離がｆで、防振係数(手ブレ補正時の防振レンズ群の移動量に対する結像面Ｉ上での像の移動量の比)をＫとするとき、角度θの回転ブレを補正するには、手ブレ補正用のレンズ群を(ｆ・tanθ)／Ｋだけ光軸と直交する方向に移動させればよい。本実施例の広角端状態において、防振係数Ｋは１．０２であり、焦点距離は１８．５(ｍｍ)であるので、０．７３４°の回転ブレを補正するための第３レンズ群Ｇ３の移動量は０．２３２(ｍｍ)である。本実施例の望遠端状態において、防振係数Ｋは１．７１であり、焦点距離は５３．４(ｍｍ)であるので、０．４３２°の回転ブレを補正するための第３レンズ群Ｇ３の移動量は０．２３５(ｍｍ)である。   Further, in the variable magnification optical system having the image stabilization function according to the present embodiment, the focal length of the entire variable magnification optical system is f, and the image stabilization coefficient (image formation with respect to the movement amount of the image stabilization lens group during camera shake correction) is performed. In order to correct rotational shake at an angle θ, where K is the ratio of the amount of movement of the image on the surface I), the lens group for camera shake correction is orthogonal to the optical axis by (f · tan θ) / K. Move in the direction. In the wide-angle end state of the present embodiment, since the image stabilization coefficient K is 1.02 and the focal length is 18.5 (mm), the third lens group G3 for correcting rotational blur of 0.734 °. The movement amount is 0.232 (mm). In the telephoto end state of the present embodiment, since the image stabilization coefficient K is 1.71 and the focal length is 53.4 (mm), the third lens group G3 for correcting rotational blur of 0.432 °. The amount of movement is 0.235 (mm).

以下の表１に、第１実施例に係る防振機能を有する変倍光学系の諸元値を示す。
［全体諸元］において、ｆは焦点距離、ＦＮＯはＦナンバー、Ｗは広角端状態、Ｍは中間焦点距離状態、Ｔは望遠端状態を表す。［レンズデータ］において、第１列Ｎは物体側から数えたレンズ面の順番、第２列ｒはレンズ面の曲率半径、第３列ｄはレンズ面の間隔、第４列νｄはｄ線（波長λ＝５８７．６ｎｍ）に対するアッベ数、第５列ｎｄはｄ線（波長λ＝５８７．６ｎｍ）に対する屈折率を表す。また、ｒ＝０．０００は平面を表し、Ｂｆはバックフォーカスを示し、空気の屈折率ｎｄ＝１．００００は、その記載を省略する。
［非球面データ］には、面番号Ｎ、非球面の形状を次式で表した場合の非球面係数、円錐定数を表す。
ｘ＝（ｈ2／ｒ）／［１＋｛１−κ（ｈ／ｒ）2｝1/2］＋Ｃ４ｈ4＋Ｃ６ｈ6＋Ｃ８ｈ8＋Ｃ１０ｈ10
なお、ｘは、面の頂点を基準としたときの光軸からの高さｈの位置での光軸方向の変位であり、κは円錐定数、Ｃ４、Ｃ６、Ｃ８、Ｃ１０は非球面係数であり、ｒは基準球面の曲率半径（近軸曲率半径）である。なお、「Ｅ−ｎ」は「×１０−ｎ」を示し、例えば、「１．２３４Ｅ−０５」は「１．２３４×１０−５」を示す。［可変間隔データ］には、焦点距離ｆと、可変間隔の値を示す。[条件式対応値]は、各条件式の対応値を示す。 Table 1 below shows specification values of the variable magnification optical system having the image stabilization function according to the first example.
In [Overall Specifications], f represents a focal length, FNO represents an F number, W represents a wide-angle end state, M represents an intermediate focal length state, and T represents a telephoto end state. In [Lens data], the first column N is the order of the lens surfaces counted from the object side, the second column r is the radius of curvature of the lens surfaces, the third column d is the distance between the lens surfaces, and the fourth column νd is the d line ( The Abbe number for the wavelength λ = 587.6 nm) and the fifth column nd represent the refractive index for the d-line (wavelength λ = 587.6 nm). Further, r = 0.000 represents a plane, Bf represents back focus, and the refractive index nd = 1.0000 of air is omitted from the description.
[Aspherical data] represents the surface number N, the aspherical coefficient and the conic constant when the aspherical shape is expressed by the following equation.
x = (h 2 / r) / [1+ {1-κ (h / r) 2 } 1/2 ] + C4h 4 + C6h 6 + C8h 8 + C10h 10
Note that x is the displacement in the optical axis direction at the position of the height h from the optical axis with respect to the vertex of the surface, κ is the conic constant, and C4, C6, C8 and C10 are aspherical coefficients. Yes, r is the radius of curvature of the reference spherical surface (paraxial radius of curvature). “E-n” indicates “× 10 −n ”, for example, “1.234E-05” indicates “1.234 × 10 −5 ”. [Variable interval data] indicates the focal length f and the value of the variable interval. [Conditional Expression Corresponding Value] indicates the corresponding value of each conditional expression.

なお、以下の全ての実施例の諸元値において、掲載されている焦点距離ｆ、曲率半径ｒ、面間隔ｄ、その他の長さ等は、特記のない場合一般に「ｍｍ」が使われるが、光学系は、比例拡大又は比例縮小しても同等の光学性能が得られるので、これに限られるものではない。また、単位は「ｍｍ」に限定されること無く他の適当な単位を用いることもできる。さらに、これらの記号の説明は、以降の各実施例の諸元値においても同様とし、重複した説明を省略する。   In addition, in the specification values of all the following examples, “mm” is generally used as the focal length f, the radius of curvature r, the surface interval d, and other lengths, etc. unless otherwise specified. The optical system is not limited to this because an equivalent optical performance can be obtained even when proportional expansion or proportional reduction is performed. Further, the unit is not limited to “mm”, and other appropriate units may be used. Further, the description of these symbols is the same in the specification values of the following embodiments, and the duplicate description is omitted.

（表１）
[全体諸元]
Ｗ Ｍ Ｔ
f＝ 18.5 35.0 53.4
FNO＝ 3.6 4.5 5.9

[レンズデータ]
Ｎ ｒ ｄ νｄ ｎｄ
1) 60.622 1.9 64.10 1.5174
2) 17.000 0.2 38.09 1.5539
3) 13.553 9.5
4) -58.369 1.3 60.68 1.5638
5) 31.778 1.2
6) 30.611 2.9 25.43 1.8052
7) 124.231 D7
8) 61.265 2.2 64.10 1.5168
9) -38.686 0.1
10) 25.081 4.1 70.41 1.4875
11) -30.802 1.0 28.46 1.7283
12) 0.000 D12
13) 0.000 1.8 開口絞りＳＰ
14) -38.161 2.1 32.35 1.8503
15) -13.420 1.0 49.61 1.7725
16) 88.250 D16
17) -142.040 2.5 70.41 1.4875
18) -24.777 0.1
19) 105.560 5.4 70.41 1.4875
20) -15.502 1.0 32.35 1.8503
21) -29.334 Bf

［非球面データ］
N= 3
κ= 1
C4= 2.72910E-05
C6= 4.86920E-08
C8= -5.03710E-11
C10= 9.29550E-13

［可変間隔データ］
Ｗ Ｍ Ｔ
D7= 29.69 8.81 2.00
D12= 3.39 9.41 13.97
D16= 12.84 6.81 2.25
Bf= 40.10 55.68 3.76

［条件式対応値］
（１）：(ｒ２＋ｒ１)／(ｒ２−ｒ１)＝ 0.543
（２）：｜ｆｖｒ／ｆｗ｜＝ 2.028
（３）：｜ｆｖｒ／ｆ２｜＝ 1.275
(Table 1)
[Overall specifications]
W M T
f = 18.5 35.0 53.4
FNO = 3.6 4.5 5.9

[Lens data]
N r d νd nd
1) 60.622 1.9 64.10 1.5174
2) 17.000 0.2 38.09 1.5539
3) 13.553 9.5
4) -58.369 1.3 60.68 1.5638
5) 31.778 1.2
6) 30.611 2.9 25.43 1.8052
7) 124.231 D7
8) 61.265 2.2 64.10 1.5168
9) -38.686 0.1
10) 25.081 4.1 70.41 1.4875
11) -30.802 1.0 28.46 1.7283
12) 0.000 D12
13) 0.000 1.8 Aperture stop SP
14) -38.161 2.1 32.35 1.8503
15) -13.420 1.0 49.61 1.7725
16) 88.250 D16
17) -142.040 2.5 70.41 1.4875
18) -24.777 0.1
19) 105.560 5.4 70.41 1.4875
20) -15.502 1.0 32.35 1.8503
21) -29.334 Bf

[Aspherical data]
N = 3
κ = 1
C4 = 2.72910E-05
C6 = 4.86920E-08
C8 = -5.03710E-11
C10 = 9.29550E-13

[Variable interval data]
W M T
D7 = 29.69 8.81 2.00
D12 = 3.39 9.41 13.97
D16 = 12.84 6.81 2.25
Bf = 40.10 55.68 3.76

[Conditional expression values]
(1): (r2 + r1) / (r2-r1) = 0.543
(2): | fvr / fw | = 2.028
(3): | fvr / f2 | = 1.275

図２（ａ）、および２（ｂ）は、それぞれ第１実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。図３は、第１実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。図４（ａ）、および４（ｂ）は、それぞれ第１実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態での諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。   FIGS. 2A and 2B are graphs showing various aberrations and image blur correction at the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example. The meridional transverse aberration diagram is shown. FIG. 3 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example. FIGS. 4 (a) and 4 (b) are graphs showing various aberrations and image blur correction in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example. The meridional transverse aberration diagram is shown.

各諸収差図より第１実施例に係る防振機能を有する変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し、優れた結像性能を有していることがわかる。   From the various aberration diagrams, the variable magnification optical system having the anti-vibration function according to the first example is excellent in correcting various aberrations from the wide-angle end state to the telephoto end state and having excellent imaging performance. Recognize.

（第２実施例）
図５は、第２実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。
第２実施例に係る防振機能を有する変倍光学系は、図５に示すように、物体側から順に、負の屈折力を持つ第１レンズ群Ｇ１、正の屈折力を持つ第２レンズ群Ｇ２、開口絞りＳＰ、負の屈折力を持つ第３レンズ群Ｇ３、および正の屈折力を持つ第４レンズ群Ｇ４で構成されている。 (Second embodiment)
FIG. 5 is a cross-sectional view illustrating a lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the second example.
As shown in FIG. 5, the variable magnification optical system according to the second example includes a first lens group G1 having negative refractive power and a second lens having positive refractive power in order from the object side. It includes a group G2, an aperture stop SP, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power.

第１レンズ群Ｇ１は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと、物体側に凸面を向けた負メニスカスレンズと、物体側に凸面を向けた正メニスカスレンズとからなり、最も物体側の負メニスカスレンズは像面側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。   The first lens group G1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a negative meniscus lens having a convex surface facing the object side, and a positive meniscus lens having a convex surface facing the object side. The most object side negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image side.

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と両凸形状の正レンズとの接合レンズと、両凸形状の正レンズとからなる。   The second lens group G2 includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a biconvex positive lens.

第３レンズ群Ｇ３は、物体側から順に、物体側に凹面を向けた正メニスカスレンズと両凹形状の負レンズとの接合負レンズと、物体側に凸面を向けた負メニスカスレンズとからなる。   The third lens group G3 includes, in order from the object side, a cemented negative lens composed of a positive meniscus lens having a concave surface facing the object side and a biconcave negative lens, and a negative meniscus lens having a convex surface facing the object side.

第４レンズ群Ｇ４は、物体側から順に、物体側に凹面を向けた正メニスカスレンズと、両凸形状の正レンズと像面Ｉに凸面を向けた負メニスカスレンズとの接合レンズとからなる。   The fourth lens group G4 is composed of, in order from the object side, a positive meniscus lens having a concave surface facing the object side, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface directed to the image plane I.

開口絞りＳＰは、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間に位置し、広角端状態から望遠端状態への変倍の際に、第３レンズ群Ｇ３と伴に移動する。   The aperture stop SP is located between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 when zooming from the wide-angle end state to the telephoto end state.

広角端状態から望遠端状態への変倍の際、第１レンズ群Ｇ１は像面Ｉに向かって凸の軌跡で移動し、第２レンズ群Ｇ２、第４レンズ群Ｇ４は一体に物体側へ移動し、第３レンズ群Ｇ３は物体側に移動する。   During zooming from the wide-angle end state to the telephoto end state, the first lens group G1 moves along a convex locus toward the image plane I, and the second lens group G2 and the fourth lens group G4 are integrally moved toward the object side. The third lens group G3 moves to the object side.

また、本実施例に係る防振機能を有する変倍光学系では、第３レンズ群Ｇ３内の物体側の接合負レンズを光軸と直交する方向にシフトさせることで撮影画像のブレを補正している。   In the variable magnification optical system having the image stabilization function according to the present embodiment, the blur of the photographed image is corrected by shifting the cemented negative lens on the object side in the third lens group G3 in the direction orthogonal to the optical axis. ing.

また、本実施例に係る防振機能を有する変倍光学系では、変倍光学系全系の焦点距離がｆで、防振係数(手ブレ補正時の防振レンズ群の移動量に対する結像面Ｉ上での像の移動量の比)をＫとするとき、角度θの回転ブレを補正するには、手ブレ補正用のレンズ群を(ｆ・tanθ)／Ｋだけ光軸と直交する方向に移動させればよい。本実施例の広角端状態において、防振係数Ｋは０．８０７であり、焦点距離は１８．５(ｍｍ)であるので、０．７３６°の回転ブレを補正するための第３レンズ群Ｇ３の移動量は０．２９４(ｍｍ)である。本実施例の望遠端状態において、防振係数Ｋは１．３２１であり、焦点距離は５３．２(ｍｍ)であるので、０．４３３°の回転ブレを補正するための第３レンズ群Ｇ３の移動量は０．３０４(ｍｍ)である。   Further, in the variable magnification optical system having the image stabilization function according to the present embodiment, the focal length of the entire variable magnification optical system is f, and the image stabilization coefficient (image formation with respect to the movement amount of the image stabilization lens group during camera shake correction) is performed. In order to correct rotational shake at an angle θ, where K is the ratio of the amount of movement of the image on the surface I), the lens group for camera shake correction is orthogonal to the optical axis by (f · tan θ) / K. Move in the direction. In the wide-angle end state of the present embodiment, the image stabilization coefficient K is 0.807, and the focal length is 18.5 (mm). Therefore, the third lens group G3 for correcting rotational blur of 0.736 °. The movement amount is 0.294 (mm). In the telephoto end state of the present embodiment, the image stabilization coefficient K is 1.321, and the focal length is 53.2 (mm). Therefore, the third lens group G3 for correcting rotational blur of 0.433 °. Is 0.304 (mm).

以下の表２に、第２実施例に係る防振機能を有する変倍光学系の諸元の値を示す。
（表２）
[全体諸元]
Ｗ Ｍ Ｔ
f＝ 18.5 35.0 53.4
FNO＝ 3.6 4.5 5.9

[レンズデータ]
Ｎ ｒ ｄ νｄ ｎｄ
1) 131.712 1.9 59.45 1.5400
2) 15.971 0.2 38.09 1.5539
3) 13.618 9.7
4) 87.982 1.3 64.10 1.5168
5) 25.700 1.2
6) 22.185 3.2 28.46 1.7283
7) 38.952 D7
8) 23.434 1.0 27.51 1.7552
9) 13.559 4.1 64.10 1.5168
10) -130.808 0.1
11) 36.669 2.2 58.94 1.5182
12) -206.683 D12
13) 0.000 4.2 開口絞りＳＰ
14) -32.479 2.4 28.69 1.7950
15) -11.321 1.3 50.23 1.7200
16) 368.302 1.0
17) 150.000 1.5 49.31 1.7432
18) 47.176 D18
19) -314.793 3.2 64.10 1.5168
20) -24.314 0.2
21) 57.333 4.8 64.10 1.5168
22) -18.137 1.0 27.51 1.7552
23) -60.079 Bf

［非球面データ］
N= 3
κ= 1
C4= 2.06310E-05
C6= 4.26210E-08
C8= -6.23900E-11
C10= 3.77100E-13

［可変間隔データ］
Ｗ Ｍ Ｔ
D7= 33.24 9.81 1.35
D12= 0.90 5.63 9.06
D18= 11.53 6.80 3.37
Bf= 39.71 53.79 71.87

［条件式対応値］
（１）：(ｒ２＋ｒ１)／(ｒ２−ｒ１)＝ 0.838
（２）：｜ｆｖｒ／ｆｗ｜＝ 2.754
（３）：｜ｆｖｒ／ｆ２｜＝ 1.738
Table 2 below shows values of specifications of the variable magnification optical system having the image stabilization function according to the second example.
(Table 2)
[Overall specifications]
W M T
f = 18.5 35.0 53.4
FNO = 3.6 4.5 5.9

[Lens data]
N r d νd nd
1) 131.712 1.9 59.45 1.5400
2) 15.971 0.2 38.09 1.5539
3) 13.618 9.7
4) 87.982 1.3 64.10 1.5168
5) 25.700 1.2
6) 22.185 3.2 28.46 1.7283
7) 38.952 D7
8) 23.434 1.0 27.51 1.7552
9) 13.559 4.1 64.10 1.5168
10) -130.808 0.1
11) 36.669 2.2 58.94 1.5182
12) -206.683 D12
13) 0.000 4.2 Aperture stop SP
14) -32.479 2.4 28.69 1.7950
15) -11.321 1.3 50.23 1.7200
16) 368.302 1.0
17) 150.000 1.5 49.31 1.7432
18) 47.176 D18
19) -314.793 3.2 64.10 1.5168
20) -24.314 0.2
21) 57.333 4.8 64.10 1.5168
22) -18.137 1.0 27.51 1.7552
23) -60.079 Bf

[Aspherical data]
N = 3
κ = 1
C4 = 2.06310E-05
C6 = 4.26210E-08
C8 = -6.23900E-11
C10 = 3.77100E-13

[Variable interval data]
W M T
D7 = 33.24 9.81 1.35
D12 = 0.90 5.63 9.06
D18 = 11.53 6.80 3.37
Bf = 39.71 53.79 71.87

[Conditional expression values]
(1): (r2 + r1) / (r2-r1) = 0.838
(2): | fvr / fw | = 2.754
(3): | fvr / f2 | = 1.738

図６（ａ）、および６（ｂ）は、第２実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。図７は、第２実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。図８（ａ）、および８（ｂ）は、第２実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態での諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。   FIGS. 6A and 6B are graphs showing various aberrations in the wide-angle end state at the time of focusing on infinity and image blur correction in the variable magnification optical system having the image stabilization function according to the second example. The meridional transverse aberration diagram at the time is shown. FIG. 7 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the second example. FIGS. 8A and 8B are graphs showing various aberrations and image blur correction in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the second example. The meridional transverse aberration diagram is shown.

各諸収差図より第２実施例に係る防振機能を有する変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し、優れた結像性能を有していることがわかる。   From the various aberration diagrams, the variable magnification optical system having the anti-vibration function according to the second example has excellent imaging performance by properly correcting various aberrations from the wide-angle end state to the telephoto end state. Recognize.

（第３実施例）
図９は、第３実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。
第３実施例に係る防振機能を有する変倍光学系は、図９に示すように、物体側から順に、負の屈折力を持つ第１レンズ群Ｇ１、開口絞りＳＰを含み正の屈折力を持つ第２レンズ群Ｇ２、負の屈折力を持つ第３レンズ群Ｇ３、および正の屈折力を持つ第４レンズ群Ｇ４で構成されている。 (Third embodiment)
FIG. 9 is a cross-sectional view showing a lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the third example.
As shown in FIG. 9, the variable magnification optical system according to the third example includes a first lens group G1 having a negative refractive power and an aperture stop SP in order from the object side. The second lens group G2 having a negative refractive power, the third lens group G3 having a negative refractive power, and the fourth lens group G4 having a positive refractive power.

第１レンズ群Ｇ１は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと、両凹形状の負レンズと、物体側に凸面を向けた正メニスカスレンズとからなり、最も物体側の負メニスカスレンズは像面Ｉ側のレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。   The first lens group G1 includes, in order from the object side, a negative meniscus lens having a convex surface directed toward the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface directed toward the object side. The negative meniscus lens is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the lens surface on the image plane I side.

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と両凸形状の正レンズとの接合レンズと、開口絞りＳＰと、物体側に凸面を向けた正メニスカスレンズとからなる。   The second lens group G2 includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface directed toward the object side and a biconvex positive lens, an aperture stop SP, and a positive meniscus lens having a convex surface directed toward the object side. It consists of.

第３レンズ群Ｇ３は、物体側から順に、物体側に凹面を向けた正メニスカスレンズと両凹形状の負レンズとの接合レンズとからなる。   The third lens group G3 is composed of, in order from the object side, a cemented lens of a positive meniscus lens having a concave surface directed toward the object side and a biconcave negative lens.

第４レンズ群Ｇ４は、物体側から順に、物体側に凹面を向けた正メニスカスレンズと、両凸形状の正レンズと像面Ｉ側に凸面を向けた負メニスカスレンズとの接合レンズとからなる。   The fourth lens group G4 includes, in order from the object side, a positive meniscus lens having a concave surface directed toward the object side, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface directed toward the image surface I. .

開口絞りＳＰは、第２レンズ群Ｇ２内に位置し、広角端状態から望遠端状態への変倍の際に、第２レンズ群Ｇ２と伴に移動する。   The aperture stop SP is located in the second lens group G2, and moves together with the second lens group G2 when zooming from the wide-angle end state to the telephoto end state.

広角端状態から望遠端状態への変倍の際、第１レンズ群Ｇ１は像面Ｉに向かって凸の軌跡で移動し、第２レンズ群Ｇ２、第４レンズ群Ｇ４は一体に物体側へ移動し、第３レンズ群Ｇ３は物体側に移動する。   During zooming from the wide-angle end state to the telephoto end state, the first lens group G1 moves along a convex locus toward the image plane I, and the second lens group G2 and the fourth lens group G4 are integrally moved toward the object side. The third lens group G3 moves to the object side.

また、本実施例に係る防振機能を有する変倍光学系では、第３レンズ群Ｇ３全体を光軸と直交する方向にシフトさせることで撮影画像のブレを補正している。   Further, in the variable magnification optical system having the image stabilization function according to the present embodiment, the blur of the captured image is corrected by shifting the entire third lens group G3 in the direction orthogonal to the optical axis.

また、本実施例に係る防振機能を有する変倍光学系では、変倍光学系全系の焦点距離がｆで、防振係数(手ブレ補正時の防振レンズ群の移動量に対する結像面Ｉ上での像の移動量の比)をＫとするとき、角度θの回転ブレを補正するには、手ブレ補正用のレンズ群を(ｆ・tanθ)／Ｋだけ光軸と直交する方向に移動させればよい。本実施例の広角端状態において、防振係数Ｋは１．０２４であり、焦点距離は１８．５(ｍｍ)であるので、０．７３４°の回転ブレを補正するための第３レンズ群Ｇ３の移動量は０．２３１(ｍｍ)である。本実施例の望遠端状態において、防振係数Ｋは１．６７４であり、焦点距離は５３．４(ｍｍ)であるので、０．４３２°の回転ブレを補正するための第３レンズ群Ｇ３の移動量は０．２４１(ｍｍ)である。   Further, in the variable magnification optical system having the image stabilization function according to the present embodiment, the focal length of the entire variable magnification optical system is f, and the image stabilization coefficient (image formation with respect to the movement amount of the image stabilization lens group during camera shake correction) is performed. In order to correct rotational shake at an angle θ, where K is the ratio of the amount of movement of the image on the surface I), the lens group for camera shake correction is orthogonal to the optical axis by (f · tan θ) / K. Move in the direction. In the wide-angle end state of this embodiment, the image stabilization coefficient K is 1.024, and the focal length is 18.5 (mm). Therefore, the third lens group G3 for correcting rotational blur of 0.734 °. The amount of movement is 0.231 (mm). In the telephoto end state of the present embodiment, since the image stabilization coefficient K is 1.474 and the focal length is 53.4 (mm), the third lens group G3 for correcting the rotation blur of 0.432 °. The movement amount is 0.241 (mm).

以下の表３に、第３実施例に係る防振機能を有する変倍光学系の諸元の値を示す。
（表３）
[全体諸元]
Ｗ Ｍ Ｔ
f＝ 18.5 35.0 53.4
FNO＝ 3.6 4.6 5.9

[レンズデータ]
Ｎ ｒ ｄ νｄ ｎｄ
1) 90.000 1.9 64.10 1.5168
2) 15.600 0.2 38.09 1.5539
3) 13.500 9.0
4) -139.488 1.5 64.10 1.5168
5) 29.888 0.5
6) 25.526 2.9 27.51 1.7552
7) 58.853 D7
8) 31.996 1.0 25.68 1.7847
9) 16.606 4.1 58.94 1.5182
10) -34.936 1.9
11) 0.000 0.6 開口絞りＳＰ
12) 17.948 2.0 64.10 1.5168
13) 30.374 D13
14) -41.530 2.4 32.35 1.8503
15) -11.135 1.0 46.62 1.8160
16) 116.283 D16
17) -123.488 2.5 64.10 1.5168
18) -23.517 0.1
19) 69.120 5.7 52.31 1.5174
20) -15.976 1.0 28.69 1.7950
21) -49.976 Bf

[非球面データ]
N= 3
κ= 1
C4= 2.88580E-05
C6= 4.53990E-08
C8= -7.01060E-12
C10= 8.75300E-13

[可変間隔データ]
Ｗ Ｍ Ｔ
D7= 31.69 9.47 12.19
D13= 2.60 7.96 12.19
D16= 15.19 9.83 5.60
Bf= 38.30 54.10 72.22

［条件式対応値］
（１）：(ｒ２＋ｒ１)／(ｒ２−ｒ１)＝ 0.474
（２）：｜ｆｖｒ／ｆｗ｜＝ 2.194
（３）：｜ｆｖｒ／ｆ２｜＝ 1.413
Table 3 below shows values of specifications of the variable magnification optical system having the image stabilization function according to the third example.
(Table 3)
[Overall specifications]
W M T
f = 18.5 35.0 53.4
FNO = 3.6 4.6 5.9

[Lens data]
N r d νd nd
1) 90.000 1.9 64.10 1.5168
2) 15.600 0.2 38.09 1.5539
3) 13.500 9.0
4) -139.488 1.5 64.10 1.5168
5) 29.888 0.5
6) 25.526 2.9 27.51 1.7552
7) 58.853 D7
8) 31.996 1.0 25.68 1.7847
9) 16.606 4.1 58.94 1.5182
10) -34.936 1.9
11) 0.000 0.6 Aperture stop SP
12) 17.948 2.0 64.10 1.5168
13) 30.374 D13
14) -41.530 2.4 32.35 1.8503
15) -11.135 1.0 46.62 1.8160
16) 116.283 D16
17) -123.488 2.5 64.10 1.5168
18) -23.517 0.1
19) 69.120 5.7 52.31 1.5174
20) -15.976 1.0 28.69 1.7950
21) -49.976 Bf

[Aspherical data]
N = 3
κ = 1
C4 = 2.88580E-05
C6 = 4.53990E-08
C8 = -7.01060E-12
C10 = 8.75300E-13

[Variable interval data]
W M T
D7 = 31.69 9.47 12.19
D13 = 2.60 7.96 12.19
D16 = 15.19 9.83 5.60
Bf = 38.30 54.10 72.22

[Conditional expression values]
(1): (r2 + r1) / (r2-r1) = 0.474
(2): | fvr / fw | = 2.194
(3): | fvr / f2 | = 1.413

図１０（ａ）、および１０（ｂ）は、第３実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。図１１は、第３実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。図１２（ａ）、および１２（ｂ）は、第３実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態での諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。   FIGS. 10A and 10B are graphs showing various aberrations in the wide-angle end state at the time of focusing on infinity and image blur correction in the variable magnification optical system having the image stabilization function according to the third example. The meridional transverse aberration diagram at the time is shown. FIG. 11 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the third example. FIGS. 12A and 12B are graphs showing various aberrations and image blur correction in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the third example. The meridional transverse aberration diagram is shown.

各諸収差図より第３実施例に係る防振機能を有する変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し、優れた結像性能を有していることがわかる。   From the various aberration diagrams, the variable magnification optical system having the anti-vibration function according to the third example is excellent in correcting various aberrations from the wide-angle end state to the telephoto end state and having excellent imaging performance. Recognize.

（第４実施例）
図１３は、第４実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。
第４実施例に係る防振機能を有する変倍光学系は、図１３に示すように、物体側から順に、負の屈折力を持つ第１レンズ群Ｇ１、正の屈折力を持つ第２レンズ群Ｇ２、開口絞りＳＰ、負の屈折力を持つ第３レンズ群Ｇ３、固定絞りＦＳ、および正の屈折力を持つ第４レンズ群Ｇ４で構成されている。 (Fourth embodiment)
FIG. 13 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the fourth example.
As shown in FIG. 13, the variable magnification optical system according to the fourth example includes a first lens group G1 having a negative refractive power and a second lens having a positive refractive power in order from the object side. The lens unit includes a group G2, an aperture stop SP, a third lens group G3 having a negative refractive power, a fixed stop FS, and a fourth lens group G4 having a positive refractive power.

第１レンズ群Ｇ１は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと、両凹形状の負レンズと、物体側に凸面を向けた正メニスカスレンズとからなり、最も物体側の負メニスカスレンズは像面Ｉ側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。   The first lens group G1 includes, in order from the object side, a negative meniscus lens having a convex surface directed toward the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface directed toward the object side. The negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image plane I side.

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と両凸形状の正レンズとの接合レンズと、物体側に凸面を向けた正メニスカスレンズとからなる。   The second lens group G2 includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.

第３レンズ群Ｇ３は、物体側から順に、物体側に凹面を向けた正メニスカスレンズと両凹形状の負レンズとの接合レンズとからなる。   The third lens group G3 is composed of, in order from the object side, a cemented lens of a positive meniscus lens having a concave surface directed toward the object side and a biconcave negative lens.

第４レンズ群Ｇ４は、物体側から順に、物体側に凹面を向けた正メニスカスレンズと、両凸形状の正レンズと像面Ｉ側に凸面を向けた負メニスカスレンズとの接合レンズとからなる。   The fourth lens group G4 includes, in order from the object side, a positive meniscus lens having a concave surface directed toward the object side, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface directed toward the image surface I. .

開口絞りＳＰは第２レンズ群Ｇ２と第３レンズ群Ｇ３との間に位置し、固定絞りＦＳは第３レンズ群Ｇ３と第４レンズ群Ｇ４との間に位置し、広角端状態から望遠端状態への変倍の際に、共に第３レンズ群と一体に移動する。   The aperture stop SP is located between the second lens group G2 and the third lens group G3, and the fixed stop FS is located between the third lens group G3 and the fourth lens group G4. From the wide-angle end state to the telephoto end During zooming to the state, both move together with the third lens group.

広角端状態から望遠端状態への変倍の際、第１レンズ群Ｇ１は像面Ｉに向かって凸の軌跡で移動し、第２レンズ群Ｇ２、第４レンズ群Ｇ４は一体に物体側へ移動し、第３レンズ群Ｇ３は物体側に移動する。   During zooming from the wide-angle end state to the telephoto end state, the first lens group G1 moves along a convex locus toward the image plane I, and the second lens group G2 and the fourth lens group G4 are integrally moved toward the object side. The third lens group G3 moves to the object side.

また、本実施例に係る防振機能を有する変倍光学系では、第３レンズ群Ｇ３全体を光軸と直交する方向にシフトさせることで撮影画像のブレを補正している。   Further, in the variable magnification optical system having the image stabilization function according to the present embodiment, the blur of the captured image is corrected by shifting the entire third lens group G3 in the direction orthogonal to the optical axis.

また、本実施例に係る防振機能を有する変倍光学系では、変倍光学系全系の焦点距離がｆで、防振係数(手ブレ補正時の防振レンズ群の移動量に対する結像面Ｉ上での像の移動量の比)をＫとするとき、角度θの回転ブレを補正するには、手ブレ補正用のレンズ群を(ｆ・tanθ)／Ｋだけ光軸と直交する方向に移動させればよい。本実施例の広角端状態において、防振係数Ｋは１．１８６であり、焦点距離は１８．７(ｍｍ)であるので、０．７３１°の回転ブレを補正するための第３レンズ群Ｇ３の移動量は０．２０２(ｍｍ)である。本実施例の望遠端状態において、防振係数Ｋは１．９０６であり、焦点距離は５３．４(ｍｍ)であるので、０．４３２°の回転ブレを補正するための第３レンズ群Ｇ３の移動量は０．２１１(ｍｍ)である。   Further, in the variable magnification optical system having the image stabilization function according to the present embodiment, the focal length of the entire variable magnification optical system is f, and the image stabilization coefficient (image formation with respect to the movement amount of the image stabilization lens group during camera shake correction) is performed. In order to correct rotational shake at an angle θ, where K is the ratio of the amount of movement of the image on the surface I), the lens group for camera shake correction is orthogonal to the optical axis by (f · tan θ) / K. Move in the direction. In the wide-angle end state of this embodiment, the image stabilization coefficient K is 1.186, and the focal length is 18.7 (mm). Therefore, the third lens group G3 for correcting rotational blur of 0.731 °. Is 0.202 (mm). In the telephoto end state of the present embodiment, since the image stabilization coefficient K is 1.906 and the focal length is 53.4 (mm), the third lens group G3 for correcting the rotation blur of 0.432 °. The amount of movement is 0.211 (mm).

以下の表４に、第４実施例に係る防振機能を有する変倍光学系の諸元の値を示す。
（表４）
[全体諸元]
Ｗ Ｍ Ｔ
f＝ 18.7 35.1 53.4
FNO＝ 3.6 4.8 5.8

[レンズデータ]
Ｎ ｒ ｄ νｄ ｎｄ
1) 119.035 1.9 64.10 1.5168
2) 15.000 0.2 38.09 1.5539
3) 12.800 10.4
4) -437.199 1.7 61.16 1.5891
5) 32.272 0.4
6) 24.794 3.4 27.51 1.7552
7) 57.814 D7
8) 25.900 1.2 23.78 1.8467
9) 15.477 4.6 59.45 1.5400
10) -38.388 0.1
11) 27.920 2.3 52.31 1.5174
12) 62.795 D12
13) 0.000 2.9 開口絞りＳＰ
14) -35.900 2.8 32.35 1.8503
15) -10.500 0.9 46.62 1.8160
16) 100.889 4.6
17) 0.000 D17 固定絞りＦＳ
18) -300.000 3.0 70.41 1.4875
19) -23.887 0.1
20) 98.237 5.3 70.41 1.4875
21) -17.144 1.4 32.35 1.8503
22) -39.167 Bf

[非球面データ]
N= 3
κ= 1
C4= 3.13260E-05
C6= 7.07910E-08
C8= -7.54810E-11
C10= 1.22730E-12

[可変間隔データ]
Ｗ Ｍ Ｔ
D7= 31.87 9.65 2.18
D12= 2.6 7.96 12.19
D17= 15.69 10.33 6.1
Bf= 38.36 54.08 72.07

[条件式対応値］
（１）：(ｒ２＋ｒ１)／(ｒ２−ｒ１)＝ 0.475
（２）：｜ｆｖｒ／ｆｗ｜＝ 1.855
（３）：｜ｆｖｒ／ｆ２｜＝ 1.276
Table 4 below shows values of specifications of the variable magnification optical system having the image stabilization function according to the fourth example.
(Table 4)
[Overall specifications]
W M T
f = 18.7 35.1 53.4
FNO = 3.6 4.8 5.8

[Lens data]
N r d νd nd
1) 119.035 1.9 64.10 1.5168
2) 15.000 0.2 38.09 1.5539
3) 12.800 10.4
4) -437.199 1.7 61.16 1.5891
5) 32.272 0.4
6) 24.794 3.4 27.51 1.7552
7) 57.814 D7
8) 25.900 1.2 23.78 1.8467
9) 15.477 4.6 59.45 1.5400
10) -38.388 0.1
11) 27.920 2.3 52.31 1.5174
12) 62.795 D12
13) 0.000 2.9 Aperture stop SP
14) -35.900 2.8 32.35 1.8503
15) -10.500 0.9 46.62 1.8160
16) 100.889 4.6
17) 0.000 D17 Fixed aperture FS
18) -300.000 3.0 70.41 1.4875
19) -23.887 0.1
20) 98.237 5.3 70.41 1.4875
21) -17.144 1.4 32.35 1.8503
22) -39.167 Bf

[Aspherical data]
N = 3
κ = 1
C4 = 3.13260E-05
C6 = 7.07910E-08
C8 = -7.54810E-11
C10 = 1.22730E-12

[Variable interval data]
W M T
D7 = 31.87 9.65 2.18
D12 = 2.6 7.96 12.19
D17 = 15.69 10.33 6.1
Bf = 38.36 54.08 72.07

[Values for conditional expressions]
(1): (r2 + r1) / (r2-r1) = 0.475
(2): | fvr / fw | = 1.855
(3): | fvr / f2 | = 1.276

図１４（ａ）、および１４（ｂ）は、第４実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。図１５は、第４実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。図１６（ａ）、および１６（ｂ）は、第４実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態での諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。   FIGS. 14A and 14B are graphs showing various aberrations and image blur correction in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fourth example. The meridional transverse aberration diagram at the time is shown. FIG. 15 is a diagram illustrating various aberrations in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fourth example. FIGS. 16A and 16B are graphs showing various aberrations and image blur correction in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fourth example. The meridional transverse aberration diagram is shown.

各諸収差図より第４実施例に係る防振機能を有する変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し、優れた結像性能を有していることがわかる。   From the various aberration diagrams, the variable magnification optical system having the anti-vibration function according to the fourth example has excellent imaging performance by properly correcting various aberrations from the wide-angle end state to the telephoto end state. Recognize.

（第５実施例）
図１７は、第５実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。 (5th Example)
FIG. 17 is a cross-sectional view showing a lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the fifth example.

第５実施例に係る防振機能を有する変倍光学系は、図１７に示すように、物体側から順に、負の屈折力を持つ第１レンズ群Ｇ１、正の屈折力を持つ第２レンズ群Ｇ２、開口絞りＳＰ、負の屈折力を持つ第３レンズ群Ｇ３、および正の屈折力を持つ第４レンズ群Ｇ４で構成されている。   As shown in FIG. 17, the variable magnification optical system according to the fifth example has a first lens group G1 having a negative refractive power and a second lens having a positive refractive power in order from the object side. It includes a group G2, an aperture stop SP, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power.

第１レンズ群Ｇ１は、物体側から順に、物体側に凸面を向けた負メニスカスレンズと、物体側に凸面を向けた負メニスカスレンズと、物体側に凸面を向けた正メニスカスレンズとからなり、最も物体側の負メニスカスレンズは像面側のガラスレンズ面に樹脂層を設けて非球面を形成した非球面レンズである。   The first lens group G1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a negative meniscus lens having a convex surface facing the object side, and a positive meniscus lens having a convex surface facing the object side. The most object side negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image side.

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と両凸形状の正レンズとの接合レンズと、両凸形状の正レンズとからなる。   The second lens group G2 includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a biconvex positive lens.

第３レンズ群Ｇ３は、物体側から順に、物体側に凹面を向けた正メニスカスレンズと両凹形状の負レンズとの接合負レンズと、物体側に凸面を向けた正メニスカスレンズと、物体側に凸面を向けた負メニスカスレンズとからなる。   The third lens group G3 includes, in order from the object side, a cemented negative lens composed of a positive meniscus lens having a concave surface directed toward the object side and a biconcave negative lens, a positive meniscus lens having a convex surface directed toward the object side, and an object side And a negative meniscus lens having a convex surface facing the surface.

第４レンズ群Ｇ４は、物体側から順に、物体側に凹面を向けた正メニスカスレンズと、両凸形状の正レンズと像面Ｉに凸面を向けた負メニスカスレンズとの接合レンズとからなる。   The fourth lens group G4 is composed of, in order from the object side, a positive meniscus lens having a concave surface facing the object side, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface directed to the image plane I.

開口絞りＳＰは、第２レンズ群Ｇ２と第３レンズ群Ｇ３との間に位置し、広角端状態から望遠端状態への変倍の際に、第３レンズ群Ｇ３と伴に移動する。   The aperture stop SP is located between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 when zooming from the wide-angle end state to the telephoto end state.

広角端状態から望遠端状態への変倍の際、第１レンズ群Ｇ１は像面Ｉに向かって凸の軌跡で移動し、第２レンズ群Ｇ２、第４レンズ群Ｇ４は一体に物体側へ移動し、第３レンズ群Ｇ３は物体側に移動する。   During zooming from the wide-angle end state to the telephoto end state, the first lens group G1 moves along a convex locus toward the image plane I, and the second lens group G2 and the fourth lens group G4 are integrally moved toward the object side. The third lens group G3 moves to the object side.

また、本実施例に係る防振機能を有する変倍光学系では、第３レンズ群Ｇ３内の物体側の接合負レンズと物体側に凸面を向けた正メニスカスレンズとを光軸と直交する方向にシフトさせることで撮影画像のブレを補正している。   In the zoom optical system having the image stabilization function according to the present embodiment, the object side cemented negative lens in the third lens group G3 and the positive meniscus lens having the convex surface facing the object side are orthogonal to the optical axis. The camera shake is corrected by shifting to.

また、本実施例に係る防振機能を有する変倍光学系では、変倍光学系全系の焦点距離がｆで、防振係数(手ブレ補正時の防振レンズ群の移動量に対する結像面Ｉ上での像の移動量の比)をＫとするとき、角度θの回転ブレを補正するには、手ブレ補正用のレンズ群を(ｆ・tanθ)／Ｋだけ光軸と直交する方向に移動させればよい。本実施例の広角端状態において、防振係数Ｋは１．０８６であり、焦点距離は１８．７(ｍｍ)であるので、０．７３１°の回転ブレを補正するための第３レンズ群Ｇ３の移動量は０．２１８(ｍｍ)である。本実施例の望遠端状態において、防振係数Ｋは１．７９２であり、焦点距離は５３．４(ｍｍ)であるので、０．４３２°の回転ブレを補正するための第３レンズ群Ｇ３の移動量は０．２２５(ｍｍ)である。   Further, in the variable magnification optical system having the image stabilization function according to the present embodiment, the focal length of the entire variable magnification optical system is f, and the image stabilization coefficient (image formation with respect to the movement amount of the image stabilization lens group during camera shake correction) is performed. In order to correct rotational shake at an angle θ, where K is the ratio of the amount of movement of the image on the surface I), the lens group for camera shake correction is orthogonal to the optical axis by (f · tan θ) / K. Move in the direction. In the wide-angle end state of the present embodiment, the image stabilization coefficient K is 1.086, and the focal length is 18.7 (mm). Therefore, the third lens group G3 for correcting rotational blur of 0.731 °. The amount of movement is 0.218 (mm). In the telephoto end state of the present embodiment, since the image stabilization coefficient K is 1.792 and the focal length is 53.4 (mm), the third lens group G3 for correcting the rotation blur of 0.432 °. The amount of movement is 0.225 (mm).

以下の表５に、第５実施例に係る防振機能を有する変倍光学系の諸元の値を示す。
（表５）
[全体諸元]
Ｗ Ｍ Ｔ
f＝ 18.7 35.1 53.4
FNO＝ 3.6 4.8 5.8

[レンズデータ]
Ｎ ｒ ｄ νｄ ｎｄ
1) 131.711 1.9 59.40 1.5400
2) 15.971 0.2 38.09 1.5539
3) 13.618 9.7
4) 134.981 1.3 58.89 1.5182
5) 26.404 1.2
6) 23.690 3.2 27.51 1.7552
7) 46.383 D7
8) 22.804 1.0 27.51 1.7552
9) 13.402 4.1 64.12 1.5168
10) -128.299 0.1
11) 33.277 2.2 58.89 1.5182
12) -2813.664 D12
13) 0.000 4.2 開口絞り SP
14) -29.652 2.4 28.69 1.7950
15) -11.583 1.3 50.70 1.6779
16) 31.636 1.0
17) 43.452 1.5 58.89 1.5182
18) 500 0.5
19) 150 1.5 54.66 1.7292
20) 84.620 D20
21) -365.935 3.2 64.12 1.5168
22) -26.352 0.2
23) 61.629 4.8 64.12 1.5168
24) -17.815 1.0 27.51 1.7552
25) -50.125 Bf

[非球面データ]
N= 3
κ= 1
C4= 1.91160E-05
C6= 4.26210E-08
C8= -5.83820E-11
C10= 2.93910E-13

[可変間隔データ]
Ｗ Ｍ Ｔ
D7= 33.11 9.69 1.23
D12= 1.33 6.07 9.50
D20= 8.90 4.17 0.73
Bf= 39.31 53.38 71.46

［条件式対応値］
（１）：(ｒ２＋ｒ１)／(ｒ２−ｒ１)＝ 0.888
（２）：｜ｆｖｒ／ｆｗ｜＝ 1.942
（３）：｜ｆｖｒ／ｆ２｜＝ 1.226
Table 5 below shows values of specifications of the variable magnification optical system having the image stabilization function according to the fifth example.
(Table 5)
[Overall specifications]
W M T
f = 18.7 35.1 53.4
FNO = 3.6 4.8 5.8

[Lens data]
N r d νd nd
1) 131.711 1.9 59.40 1.5400
2) 15.971 0.2 38.09 1.5539
3) 13.618 9.7
4) 134.981 1.3 58.89 1.5182
5) 26.404 1.2
6) 23.690 3.2 27.51 1.7552
7) 46.383 D7
8) 22.804 1.0 27.51 1.7552
9) 13.402 4.1 64.12 1.5168
10) -128.299 0.1
11) 33.277 2.2 58.89 1.5182
12) -2813.664 D12
13) 0.000 4.2 Aperture stop SP
14) -29.652 2.4 28.69 1.7950
15) -11.583 1.3 50.70 1.6779
16) 31.636 1.0
17) 43.452 1.5 58.89 1.5182
18) 500 0.5
19) 150 1.5 54.66 1.7292
20) 84.620 D20
21) -365.935 3.2 64.12 1.5168
22) -26.352 0.2
23) 61.629 4.8 64.12 1.5168
24) -17.815 1.0 27.51 1.7552
25) -50.125 Bf

[Aspherical data]
N = 3
κ = 1
C4 = 1.91160E-05
C6 = 4.26210E-08
C8 = -5.83820E-11
C10 = 2.93910E-13

[Variable interval data]
W M T
D7 = 33.11 9.69 1.23
D12 = 1.33 6.07 9.50
D20 = 8.90 4.17 0.73
Bf = 39.31 53.38 71.46

[Conditional expression values]
(1): (r2 + r1) / (r2-r1) = 0.888
(2): | fvr / fw | = 1.942
(3): | fvr / f2 | = 1.226

図１８（ａ）、および１８（ｂ）は、第５実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。図１９は、第５実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。図２０（ａ）、および２０（ｂ）は、第５実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態での諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。   FIGS. 18A and 18B are graphs showing various aberrations in the wide-angle end state at the time of focusing on infinity and image blur correction in the variable magnification optical system having the image stabilization function according to the fifth example. The meridional transverse aberration diagram at the time is shown. FIG. 19 shows various aberrations in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fifth example. FIGS. 20A and 20B are graphs showing various aberrations and image blur correction in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fifth example. The meridional transverse aberration diagram is shown.

各諸収差図より第５実施例に係る防振機能を有する変倍光学系は、広角端状態から望遠端状態にわたって諸収差を良好に補正し、優れた結像性能を有していることがわかる。   From the various aberration diagrams, the variable magnification optical system having the anti-vibration function according to Example 5 has excellent imaging performance by correcting various aberrations well from the wide-angle end state to the telephoto end state. Recognize.

以上の各実施例によれば、高変倍比を有しながら、振動や手ブレなどによる撮影画像のブレを補正することができ、良好な光学性能を持った防振機能を有する変倍光学系を実現することができる。   According to each of the above-described embodiments, a variable magnification optical system having a vibration proof function having a good optical performance, capable of correcting a shake of a photographed image due to vibration or camera shake while having a high zoom ratio. A system can be realized.

なお、本防振機能を有する変倍光学系の数値実施例として４群構成のものを示したが、本変倍光学系の群構成はこれに限られず、５群等の他の群構成にも適用可能である。   Although a four-group configuration is shown as a numerical example of the variable magnification optical system having the image stabilization function, the group configuration of the variable magnification optical system is not limited to this, and other group configurations such as five groups are used. Is also applicable.

また、本防振機能を有する変倍光学系において、無限遠物体から近距離物体への合焦を行うために、レンズ群の一部、１つのレンズ群、又は複数のレンズ群を合焦レンズ群として光軸方向へ移動させる構成としてもよい。この合焦レンズ群は、オートフォーカスに適用することも可能であり、オートフォーカス用のモータ、例えば超音波モータ等による駆動にも適している。なお、本変倍光学系においては、特に第１レンズ群全体又はその一部を合焦レンズ群とすることが好ましい。   Further, in the variable magnification optical system having the present image stabilization function, in order to focus from an object at infinity to an object at a short distance, a part of the lens group, one lens group, or a plurality of lens groups is a focusing lens. It is good also as a structure which moves to an optical axis direction as a group. This focusing lens group can be applied to autofocus, and is also suitable for driving by an autofocus motor, such as an ultrasonic motor. In the variable magnification optical system, it is particularly preferable that the entire first lens group or a part thereof is a focusing lens group.

また、上記各実施例では、第３レンズ群Ｇ３を防振レンズ群として光軸に垂直な方向にシフトさせる変倍光学系を例示しているが、他のレンズ群全体又はその一部、特に第２レンズ群Ｇ２や第４レンズ群を防振レンズ群とすることもできる。   In each of the above embodiments, the variable power optical system that shifts the third lens group G3 in the direction perpendicular to the optical axis as the anti-vibration lens group is illustrated, but the other lens group or a part thereof, in particular, The second lens group G2 and the fourth lens group can be used as an anti-vibration lens group.

また、本防振機能を有する変倍光学系を構成するレンズのレンズ面を非球面としてもよい。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成型したガラスモールド非球面、又はガラス面に設けた樹脂を非球面形状に形成した複合型非球面のいずれでもよい。   The lens surface of the lens constituting the variable magnification optical system having the image stabilization function may be an aspherical surface. This aspherical surface may be any one of an aspherical surface by grinding, a glass mold aspherical surface formed by molding glass into an aspherical shape, or a composite aspherical surface in which a resin provided on the glass surface is formed into an aspherical shape.

また、本防振機能を有する変倍光学系を構成するレンズのレンズ面に、広い波長域で高い透過率を有する反射防止膜を施してもよい。これにより、フレアやゴーストを軽減し、高コントラストで高い光学性能を達成することができる。
次に、本防振機能を有する変倍光学系を備えたカメラを図２１に基づいて説明する。 Further, an antireflection film having a high transmittance in a wide wavelength range may be provided on the lens surface of the lens constituting the variable magnification optical system having the present image stabilizing function. Thereby, flare and ghost can be reduced, and high optical performance can be achieved with high contrast.
Next, a camera equipped with a variable magnification optical system having the present image stabilization function will be described with reference to FIG.

図２１は、本防振機能を有する変倍光学系を備えたカメラの構成を示す図である。   FIG. 21 is a diagram illustrating a configuration of a camera including a variable magnification optical system having the image stabilization function.

本カメラ１は、図２１に示すように撮影レンズ２として上記第１実施例に係る変倍光学系を備えたデジタル一眼レフカメラである。   This camera 1 is a digital single-lens reflex camera provided with a variable magnification optical system according to the first embodiment as a photographing lens 2 as shown in FIG.

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、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に結像されたこの光は、ペンタプリズム５中で複数回反射されて接眼レンズ６へ導かれる。これにより撮影者は、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。   In the camera 1, light from an object (subject) (not shown) is collected by the taking lens 2 and imaged on the focusing screen 4 through the quick return mirror 3. The light imaged on the focusing screen 4 is reflected in the pentaprism 5 a plurality of times and guided to the eyepiece lens 6. Thus, the photographer can observe the subject image as an erect image through the eyepiece 6.

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、不図示の被写体からの光は撮像素子７へ到達する。これにより被写体からの光は、当該撮像素子７によって撮像されて、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による被写体の撮影を行うことができる。   When the release button (not shown) is pressed by the photographer, the quick return mirror 3 is retracted out of the optical path, and light from the subject (not shown) reaches the image sensor 7. Thereby, the light from the subject is picked up by the image pickup device 7 and recorded as a subject image in a memory (not shown). In this way, the photographer can shoot the subject with the camera 1.

ここで、本カメラ１に撮影レンズ２として搭載した上記第１実施例に係る防振機能を有する変倍光学系は、上記第１実施例において説明したようにその特徴的なレンズ構成によって、高変倍比、良好な光学性能、及び防振機能を実現している。これにより本カメラ１は、防振機能を有し、高変倍比と良好な光学性能を実現することができる。   Here, the variable magnification optical system having the image stabilization function according to the first example mounted on the camera 1 as the photographing lens 2 has a characteristic lens configuration as described in the first example. The zoom ratio, good optical performance, and anti-vibration function are realized. As a result, the camera 1 has an anti-vibration function and can realize a high zoom ratio and good optical performance.

なお、上記第２、第３、第４実施例に係る変倍光学系を撮影レンズ２として搭載したカメラを構成しても上記カメラ１と同様の効果を勿論奏することができる。   It should be noted that the same effect as that of the camera 1 can of course be achieved even if a camera in which the variable magnification optical system according to the second, third, and fourth examples is mounted as the photographing lens 2 is configured.

なお、上記各実施例は本発明の一具体例を示しているものであり、本発明はこれらに限定されるものではない。   In addition, each said Example has shown one specific example of this invention, and this invention is not limited to these.

第１実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。It is sectional drawing which shows the lens structure in the wide angle end state of the variable magnification optical system which has a vibration isolating function which concerns on 1st Example. （ａ）、および（ｂ）は、それぞれ第１実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。(A) and (b) are various aberration diagrams in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example, and when image blur correction is performed. The meridional transverse aberration diagram is shown. 第１実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。FIG. 6 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example. （ａ）、および（ｂ）は、それぞれ第１実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態での諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。(A) and (b) are diagrams showing various aberrations in the telephoto end state at the time of focusing on infinity and image blur correction of the variable magnification optical system having the image stabilization function according to the first example. The meridional transverse aberration diagram is shown. 第２実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。It is sectional drawing which shows the lens structure in the wide angle end state of the variable magnification optical system which has a vibration isolating function which concerns on 2nd Example. （ａ）、および（ｂ）は、それぞれ第２実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。(A) and (b) are various aberration diagrams in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the second example, and when image blur correction is performed. The meridional transverse aberration diagram is shown. 第２実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。FIG. 7 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the second example. （ａ）、および（ｂ）は、それぞれ第２実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態での諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。(A) and (b) are diagrams showing various aberrations in the telephoto end state at the time of focusing on infinity and image blur correction of the variable magnification optical system having the image stabilization function according to the second example. The meridional transverse aberration diagram is shown. 第３実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。It is sectional drawing which shows the lens structure in the wide-angle end state of the variable magnification optical system which has an anti-vibration function based on 3rd Example. （ａ）、および（ｂ）は、それぞれ第３実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。(A) and (b) are diagrams showing various aberrations in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the third example and when image blur correction is performed. The meridional transverse aberration diagram is shown. 第３実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。FIG. 10 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the third example. （ａ）、および（ｂ）は、それぞれ第３実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態での諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。(A) and (b) are diagrams showing various aberrations in the telephoto end state at the time of focusing on infinity and image blur correction in the variable magnification optical system having the image stabilization function according to the third example. The meridional transverse aberration diagram is shown. 第４実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。It is sectional drawing which shows the lens structure in the wide-angle end state of the variable magnification optical system which has a vibration isolating function which concerns on 4th Example. （ａ）、および（ｂ）は、それぞれ第４実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。(A) and (b) are diagrams showing various aberrations in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fourth example, and when image blur correction is performed. The meridional transverse aberration diagram is shown. 第４実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。FIG. 11 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fourth example. （ａ）、および（ｂ）は、それぞれ第４実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態での諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。(A) and (b) are diagrams showing various aberrations in the telephoto end state at the time of focusing on infinity and image blur correction in the variable magnification optical system having the image stabilization function according to the fourth example. The meridional transverse aberration diagram is shown. 第５実施例に係る防振機能を有する変倍光学系の広角端状態におけるレンズ構成を示す断面図である。It is sectional drawing which shows the lens structure in the wide-angle end state of the variable magnification optical system which has an anti-vibration function based on 5th Example. （ａ）、および（ｂ）は、それぞれ第５実施例に係る防振機能を有する変倍光学系の無限遠合焦時の広角端状態における諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。(A) and (b) are diagrams showing various aberrations in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fifth example, and when image blur correction is performed. The meridional transverse aberration diagram is shown. 第５実施例に係る防振機能を有する変倍光学系の無限遠合焦時の中間焦点距離状態での諸収差図を示す。FIG. 11 shows various aberration diagrams in the intermediate focal length state when the variable magnification optical system having the image stabilization function according to Example 5 is focused at infinity. （ａ）、および（ｂ）は、それぞれ第５実施例に係る防振機能を有する変倍光学系の無限遠合焦時の望遠端状態での諸収差図、および像ブレ補正をおこなった時のメリディオナル横収差図を示す。(A) and (b) are diagrams showing various aberrations in the telephoto end state at the time of focusing on infinity and image blur correction in the variable magnification optical system having the image stabilization function according to the fifth example. The meridional transverse aberration diagram is shown. 本防振機能を有する変倍光学系を備えたカメラの構成を示す図である。It is a figure which shows the structure of the camera provided with the variable magnification optical system which has this anti-vibration function.

符号の説明Explanation of symbols

Ｇ１： 第１レンズ群
Ｇ２： 第２レンズ群
Ｇ３： 第３レンズ群
Ｇ４： 第４レンズ群
ＳＰ： 開口絞り
ＦＳ： 固定絞り
Ｉ： 像面 G1: First lens group G2: Second lens group G3: Third lens group G4: Fourth lens group SP: Aperture stop FS: Fixed stop I: Image plane

Claims (15)

物体側から順に、負の屈折力を持つ第１レンズ群と、正の屈折力を持つ第２レンズ群と、負の屈折力を持つ第３レンズ群と、正の屈折力を持つ第４レンズ群を有し、広角端状態から望遠端状態まで変倍を行う際に、前記第２レンズ群と前記第３レンズ群との間隔が増大し、前記第３レンズ群と前記第４レンズ群との間隔が減少し、前記第３レンズ群全体もしくは一部を防振レンズ群として光軸と直交する方向にシフトさせることによって像ブレ発生時の像面補正を行い、さらに下記条件式を満足することを特徴とした防振機能を有する変倍光学系。
０．１２＜（ｒ２+ｒ１）／（ｒ２-ｒ１）＜１．３０
１．２０＜｜ｆｖｒ／ｆｗ｜＜３．３０
ただし、
ｒ１：前記防振レンズ群の物体側の曲率半径
ｒ２：前記防振レンズ群の像面側の曲率半径
ｆｖｒ：前記防振レンズ群の焦点距離
ｆｗ：広角端状態での全系の焦点距離 In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens having a positive refractive power And when performing zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group increases, and the third lens group and the fourth lens group And the entire third lens group or a part of the third lens group is shifted in a direction orthogonal to the optical axis as an anti-vibration lens group, thereby correcting the image plane when an image blur occurs, and further satisfying the following conditional expression: A variable magnification optical system having an anti-vibration function.
0.12 <(r2 + r1) / (r2-r1) <1.30
1.20 <| fvr / fw | <3.30
However,
r1: radius of curvature of the image stabilizing lens group on the object side r2: radius of curvature of the image stabilizing side of the image stabilizing lens group fvr: focal length of the image stabilizing lens group fw: focal length of the entire system in the wide-angle end state 下記条件式を満足することを特徴とした請求項１記載の防振機能を有する変倍光学系。
０．５０＜｜ｆｖｒ／ｆ２｜＜２．３０
ただし、
ｆｖｒ：前記防振レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離 2. The variable magnification optical system having an image stabilization function according to claim 1, wherein the following conditional expression is satisfied.
0.50 <| fvr / f2 | <2.30
However,
fvr: focal length of the anti-vibration lens group f2: focal length of the second lens group 物体側から順に、負の屈折力を持つ第１レンズ群と、正の屈折力を持つ第２レンズ群と、負の屈折力を持つ第３レンズ群と、正の屈折力を持つ第４レンズ群を有し、広角端状態から望遠端状態まで変倍を行う際に、前記第２レンズ群と前記第３レンズ群との間隔が増大し、前記第３レンズ群と前記第４レンズ群との間隔が減少し、前記第３レンズ群全体もしくは一部を防振レンズ群として光軸と直交する方向にシフトさせることによって像ブレ発生時の像面補正を行い、さらに下記条件式を満足することを特徴とした防振機能を有する変倍光学系。
０．１２＜（ｒ２+ｒ１）／（ｒ２-ｒ１）＜１．３
０．５０＜｜ｆｖｒ／ｆ２｜＜２．３０
ただし、
ｒ１：前記防振レンズ群の物体側の曲率半径
ｒ２：前記防振レンズ群の像面側の曲率半径
ｆｖｒ：前記防振レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離 In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens having a positive refractive power And when performing zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group increases, and the third lens group and the fourth lens group And the entire third lens group or a part of the third lens group is shifted in a direction orthogonal to the optical axis as an anti-vibration lens group, thereby correcting the image plane when an image blur occurs, and further satisfying the following conditional expression: A variable magnification optical system having an anti-vibration function.
0.12 <(r2 + r1) / (r2-r1) <1.3
0.50 <| fvr / f2 | <2.30
However,
r1: radius of curvature of the image stabilizing lens group on the object side r2: radius of curvature of the image stabilizing side of the image stabilizing lens group fvr: focal length of the image stabilizing lens group f2: focal length of the second lens group 広角端状態から望遠端状態まで変倍を行う際に、前記第１レンズ群が像面に向かって凸の軌跡で移動することを特徴とした請求項１から３のいずれか一項に記載の防振機能を有する変倍光学系。   The zoom lens according to any one of claims 1 to 3, wherein the first lens unit moves along a convex locus toward the image plane when zooming from the wide-angle end state to the telephoto end state. A variable power optical system with anti-vibration function. 最も像面側のレンズ面が像面に向かって凸面であることを特徴とした請求項１から４のいずれか一項に記載の防振機能を有する変倍光学系。   5. The variable magnification optical system having an image stabilization function according to claim 1, wherein the lens surface closest to the image surface is convex toward the image surface. 前記第４レンズ群は、最も像面側から順に、負レンズ、正レンズ、正レンズを有することを特徴とした請求項１から５のいずれか一項に記載の防振機能を有する変倍光学系。   The variable power optical system according to any one of claims 1 to 5, wherein the fourth lens group includes a negative lens, a positive lens, and a positive lens in order from the most image side. system. 前記第３レンズ群は接合レンズを有することを特徴とした請求項１から６のいずれか一項に記載の防振機能を有する変倍光学系。   The variable power optical system having an image stabilization function according to any one of claims 1 to 6, wherein the third lens group includes a cemented lens. 前記第２レンズ群から前記第４レンズ群の各群に少なくとも１つの接合レンズを有することを特徴とした請求項１から７のいずれか一項に記載の防振機能を有する変倍光学系。   8. The variable magnification optical system having an image stabilization function according to claim 1, wherein each of the second lens group to the fourth lens group has at least one cemented lens. 9. 広角端状態から望遠端状態まで変倍を行う際に、前記第２レンズ群と前記第４レンズ群が一体になって動くことを特徴とする請求項１から８のいずれか一項に記載の防振機能を有する変倍光学系。   9. The zoom lens according to claim 1, wherein the second lens unit and the fourth lens unit move together when zooming from the wide-angle end state to the telephoto end state. A variable power optical system with anti-vibration function. 開口絞りは、前記第３レンズ群の近傍に配置され、広角端状態から望遠端状態まで変倍を行う際に、前記第３レンズ群と一体に移動することを特徴とする請求項１から９のいずれか一項に記載の防振機能を有する変倍光学系。   The aperture stop is disposed in the vicinity of the third lens group, and moves together with the third lens group when zooming from the wide-angle end state to the telephoto end state. A variable magnification optical system having the image stabilization function according to any one of the above. 開口絞りは、前記第２レンズ群の近傍に配置され、広角端状態から望遠端状態まで変倍を行う際に、前記第２レンズ群と一体に移動することを特徴とする請求項１から９のいずれか一項に記載の防振機能を有する変倍光学系。   The aperture stop is disposed in the vicinity of the second lens group, and moves integrally with the second lens group when zooming from the wide-angle end state to the telephoto end state. A variable magnification optical system having the image stabilization function according to any one of the above. 前記第３レンズ群と前記第４レンズ群との間に固定絞りを有することを特徴とする請求項１から１１のいずれか一項に記載の防振機能を有する変倍光学系。   12. The variable magnification optical system having an anti-vibration function according to claim 1, further comprising a fixed diaphragm between the third lens group and the fourth lens group. 請求項１から１２のいずれか一項に記載の防振機能を有する変倍光学系を備えていることを特徴とする撮像装置。   An imaging apparatus comprising the variable magnification optical system having the image stabilization function according to any one of claims 1 to 12. 物体側から順に、負の屈折力を持つ第１レンズ群と、正の屈折力を持つ第２レンズ群と、負の屈折力を持つ第３レンズ群と、正の屈折力を持つ第４レンズ群を有する防振機能を有する変倍光学系の変倍方法において、
広角端状態から望遠端状態まで変倍を行う際に、前記第２レンズ群と前記第３レンズ群との間隔が増大し、前記第３レンズ群と前記第４レンズ群との間隔が減少し、前記第３レンズ群全体もしくは一部を防振レンズ群として光軸と直交する方向にシフトさせることによって像ブレ発生時の像面補正を行い、さらに下記条件式を満足することを特徴とした防振機能を有する変倍光学系の変倍方法。
０．１２＜（ｒ２+ｒ１）／（ｒ２-ｒ１）＜１．３０
１．２０＜｜ｆｖｒ／ｆｗ｜＜３．３０
ただし、
ｒ１：前記防振レンズ群の物体側の曲率半径
ｒ２：前記防振レンズ群の像面側の曲率半径
ｆｖｒ：前記防振レンズ群の焦点距離
ｆｗ：広角端状態での全系の焦点距離 In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens having a positive refractive power In a variable magnification method of a variable magnification optical system having a vibration proof function having a group,
When zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group increases, and the distance between the third lens group and the fourth lens group decreases. The entire third lens group or a part of the third lens group is shifted as a vibration-proof lens group in a direction orthogonal to the optical axis to correct the image plane when an image blur occurs, and further satisfy the following conditional expression: A zooming method for a zooming optical system having a vibration isolating function.
0.12 <(r2 + r1) / (r2-r1) <1.30
1.20 <| fvr / fw | <3.30
However,
r1: radius of curvature of the image stabilizing lens group on the object side r2: radius of curvature of the image stabilizing side of the image stabilizing lens group fvr: focal length of the image stabilizing lens group fw: focal length of the entire system in the wide-angle end state 物体側から順に、負の屈折力を持つ第１レンズ群と、正の屈折力を持つ第２レンズ群と、負の屈折力を持つ第３レンズ群と、正の屈折力を持つ第４レンズ群を有する防振機能を有する変倍光学系の変倍方法において、
広角端状態から望遠端状態まで変倍を行う際に、前記第２レンズ群と前記第３レンズ群との間隔が増大し、前記第３レンズ群と前記第４レンズ群との間隔が減少し、前記第３レンズ群全体もしくは一部を防振レンズ群として光軸と直交する方向にシフトさせることによって像ブレ発生時の像面補正を行い、さらに下記条件式を満足することを特徴とした防振機能を有する変倍光学系の変倍方法。
０．１２＜（ｒ２+ｒ１）／（ｒ２-ｒ１）＜１．３
０．５０＜｜ｆｖｒ／ｆ２｜＜２．３０
ただし、
ｒ１：前記防振レンズ群の物体側の曲率半径
ｒ２：前記防振レンズ群の像面側の曲率半径
ｆｖｒ：前記防振レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離 In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens having a positive refractive power In a variable magnification method of a variable magnification optical system having a vibration proof function having a group,
When zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group increases, and the distance between the third lens group and the fourth lens group decreases. The entire third lens group or a part of the third lens group is shifted as a vibration-proof lens group in a direction orthogonal to the optical axis to correct the image plane when an image blur occurs, and further satisfy the following conditional expression: A zooming method for a zooming optical system having a vibration isolating function.
0.12 <(r2 + r1) / (r2-r1) <1.3
0.50 <| fvr / f2 | <2.30
However,
r1: radius of curvature of the image stabilizing lens group on the object side r2: radius of curvature of the image stabilizing side of the image stabilizing lens group fvr: focal length of the image stabilizing lens group f2: focal length of the second lens group
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