JP6528355B2

JP6528355B2 - Variable magnification optical unit and imaging apparatus

Info

Publication number: JP6528355B2
Application number: JP2014067072A
Authority: JP
Inventors: 智希伊藤
Original assignee: Nikon Corp
Current assignee: Nikon Corp
Priority date: 2014-03-27
Filing date: 2014-03-27
Publication date: 2019-06-12
Anticipated expiration: 2034-03-27
Also published as: JP2015191056A

Description

本発明は、変倍光学系および撮像装置に関する。 The present invention relates to a variable power optical system and the imaging equipment.

従来、写真用カメラ、電子スチルカメラ、ビデオカメラ等に適した変倍光学系が提案されている（例えば、特許文献１参照）。 Heretofore, a variable magnification optical system suitable for a photographic camera, an electronic still camera, a video camera or the like has been proposed (see, for example, Patent Document 1).

特開２０１２−４２５５７号公報JP 2012-42557 A

しかしながら、従来の変倍光学系は、変倍時の収差変動と、近距離撮影時の収差変動が大きいという問題があった。 However, the conventional variable magnification optical system has a problem that the aberration fluctuation at the time of zooming and the aberration fluctuation at the time of short distance photographing are large.

本発明は、このような問題に鑑みてなされたものであり、高い光学性能を有する変倍光学系および撮像装置を提供することを目的とする。 The present invention has such has been made in view of the problems, and an object thereof is to provide a variable power optical system and the imaging equipment having a high optical performance.

このような目的を達成するため、第１の本発明に係る変倍光学系は、物体側から順に並んだ、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、正の屈折力を有する第３レンズ群との実質的に３個のレンズ群からなり、前記第１レンズ群は、１枚の負レンズと１枚の正レンズとからなり、前記第３レンズ群は、物体側から順に並んだ、正の屈折力を有する第３Ａレンズ群と、第３Ｂレンズ群とからなり、広角端状態から望遠端状態への変倍に際し、前記第１レンズ群が光軸方向に沿って物体方向に移動し、且つ隣り合うレンズ群の間隔が変化し、前記第３Ａレンズ群を光軸方向に沿って移動させることにより合焦を行い、前記第３Ｂレンズ群の少なくとも一部を、像ブレを補正するための防振レンズ群として、光軸と垂直方向の成分を持つように移動可能に構成し、以下の条件式を満足する。 In order to achieve such an object, a variable power optical system according to a first aspect of the present invention includes a first lens group having positive refractive power and a second lens having negative refractive power, which are arranged in order from the object side. A third lens group having a positive refractive power and a third lens group, wherein the first lens group comprises a single negative lens and a single positive lens; The third lens group is composed of a third A lens group having positive refractive power and a third B lens group arranged in order from the object side, and the first lens group in zooming from the wide-angle end state to the telephoto end state Moves in the object direction along the optical axis direction, and the distance between adjacent lens groups changes, and focusing is performed by moving the third lens group A along the optical axis direction, and the third lens group B At least a part of the lens as an anti-vibration lens group for correcting image blurring, Movably configured to have a linear direction of the component, to satisfy the following condition.

０．７３＜（−ｆ２）／ｆ３＜２．００
２．００＜｜ｆｖｒ｜／ｆ３＜６．００
但し、
ｆ２：前記第２レンズ群の焦点距離、
ｆ３：前記第３レンズ群の焦点距離、
ｆｖｒ：前記防振レンズ群の焦点距離。 0.73 <(-f2) / f3 <2.00
2.00 <| fvr | / f3 <6.00
However,
f2: focal length of the second lens group,
f3: focal length of the third lens group ,
fvr: focal length of the anti-vibration lens group.

第２の本発明に係る変倍光学係は、物体側から順に並んだ、正の屈折力を有する第１レンズ群と、負の屈折力を有する第２レンズ群と、正の屈折力を有する第３レンズ群との実質的に３個のレンズ群からなり、前記第１レンズ群は、１枚の負レンズと１枚の正レンズとからなり、前記第３レンズ群は、物体側から順に並んだ、正の屈折力を有する第３Ａレンズ群と、第３Ｂレンズ群とからなり、広角端状態から望遠端状態への変倍に際し、前記第１レンズ群が光軸方向に沿って物体方向に移動し、且つ隣り合うレンズ群の間隔が変化し、前記第３Ａレンズ群を光軸方向に沿って移動させることにより合焦を行い、前記第３Ｂレンズ群の少なくとも一部を、像ブレを補正するための防振レンズ群として、光軸と垂直方向の成分を持つように移動可能に構成し、前記防振レンズ群は、単レンズからなり、以下の条件式を満足する。 The variable magnification optical system according to the second aspect of the present invention has a first lens group having positive refractive power, a second lens group having negative refractive power, and a positive refractive power, which are arranged in order from the object side. The third lens group consists essentially of three lens groups, the first lens group consists of one negative lens and one positive lens, and the third lens group is arranged in order from the object side The third lens group A having positive refractive power and the third lens group B, and the first lens group moves in the object direction along the optical axis upon zooming from the wide-angle end state to the telephoto end state. And the distance between adjacent lens groups is changed, and focusing is performed by moving the third A lens group along the optical axis direction, and at least a part of the third B lens group is subjected to image blurring. Moves to have a component in the direction perpendicular to the optical axis as a vibration reduction lens group for correction Configure the ability the vibration reduction lens group is made of a single lens satisfies the following conditional expression.

０．７３＜（−ｆ２）／ｆ３＜２．００0.73 <(-f2) / f3 <2.00
但し、However,
ｆ２：前記第２レンズ群の焦点距離、f2: focal length of the second lens group,
ｆ３：前記第３レンズ群の焦点距離。f3: focal length of the third lens unit.

本発明に係る撮像装置は、上記いずれかの変倍光学系を備える。 An imaging apparatus according to the present invention includes any one of the above-mentioned variable magnification optical systems.

本発明によれば、高い光学性能を有する変倍光学系および撮像装置を提供することができる。 According to the present invention, it is possible to provide a variable power optical system and the imaging equipment having a high optical performance.

第１実施例に係る変倍光学系のレンズ構成を示す断面図である。It is sectional drawing which shows the lens structure of the variable magnification optical system which concerns on 1st Example. 第１実施例に係る変倍光学系の広角端状態（ｆ＝18.500）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0196）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。It is an aberrational figure in the wide-angle end state (f = 18.500) of the variable magnification optical system concerning the 1st example, (a) Aberrations figure at the time of infinity focusing, (b) at the time of short distance focusing (shooting magnification) (c) shows a coma aberration diagram when image blur correction is performed at infinity in-focus (correction angle θ = 0.30 °). 第１実施例に係る変倍光学系の中間焦点距離状態（ｆ＝35.000）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0365）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。It is an aberrational figure in the intermediate focal distance state (f = 35.000) of the variable magnification optical system according to the first example, (a) Various aberrations when focusing at infinity, (b) when focusing at close distance (C) shows a coma aberration diagram when image shake correction is performed at infinity in-focus (correction angle θ = 0.30 °). 第１実施例に係る変倍光学系の望遠端状態（ｆ＝53.500）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0554）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。It is an aberrational figure in the telephoto end state (f = 53.500) of the variable magnification optical system according to the first example, (a) Various aberrations when focusing at infinity, (b) when focusing at close distance (shooting magnification (c) shows a coma aberration diagram at the time of image blur correction (correction angle θ = 0.30 °) at infinity in-focus condition. 第２実施例に係る変倍光学系のレンズ構成を示す断面図である。It is sectional drawing which shows the lens structure of the variable magnification optical system which concerns on 2nd Example. 第２実施例に係る変倍光学系の広角端状態（ｆ＝18.500）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0196）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。It is an aberrational figure in the wide-angle end state (f = 18.500) of the variable magnification optical system according to the second example, (a) Various aberrations in focusing at infinity, (b) at focusing in short distance (c) shows a coma aberration diagram when image blur correction is performed at infinity in-focus (correction angle θ = 0.30 °). 第２実施例に係る変倍光学系の中間焦点距離状態（ｆ＝34.176）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0358）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。It is an aberrational figure in the intermediate focal distance state (f = 34.176) of the variable magnification optical system according to the second example, (a) Various aberrations in focusing at infinity, (b) at focusing in short distance (C) shows a coma aberration diagram when image shake correction is performed at infinity in-focus (correction angle θ = 0.30 °). 第２実施例に係る変倍光学系の望遠端状態（ｆ＝53.500）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0556）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。It is an aberrational figure in the telephoto end state (f = 53.500) of the variable magnification optical system according to the second example, (a) Various aberrations when focusing at infinity, (b) when focusing at close distance (shooting magnification FIG. 6C is a various aberrations diagram of β = −0.0556), and FIG. 6C is a coma aberration diagram when image blurring correction is performed at infinity focusing (correction angle θ = 0.30 °). 第３実施例に係る変倍光学系のレンズ構成を示す断面図である。It is sectional drawing which shows the lens structure of the variable magnification optical system which concerns on 3rd Example. 第３実施例に係る変倍光学系の広角端状態（ｆ＝18.477）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0194）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。It is an aberrational figure in the wide-angle end state (f = 18.477) of the variable magnification optical system concerning the 3rd example, (a) Aberrations figure at the time of infinity focusing, (b) at the time of short distance focusing (shooting magnification) FIG. 7C shows various aberrations that occurred with β = −0.0194, and FIG. 16C showing coma when the image blur correction was performed at infinity focusing (correction angle θ = 0.30 °). 第３実施例に係る変倍光学系の中間焦点距離状態（ｆ＝34.000）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0355）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。It is an aberrational figure in the intermediate focal distance state (f = 34.000) of the variable magnification optical system according to the third example, (a) Various aberrations in focusing at infinity, (b) at focusing in short distance (C) shows a coma aberration diagram when image shake correction is performed at infinity in-focus (correction angle θ = 0.30 °). 第３実施例に係る変倍光学系の望遠端状態（ｆ＝53.500）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0552）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。It is an aberrational figure in the telephoto end state (f = 53.500) of the variable magnification optical system according to the third example, (a) Various aberrations when focusing at infinity, (b) when focusing at close distance (shooting magnification (c) shows a coma aberration diagram when image blur correction is performed at infinity in-focus (correction angle θ = 0.30 °). 本実施形態に係るカメラの構成を示す略断面図である。It is a schematic sectional view showing the composition of the camera concerning this embodiment. 本実施形態に係る変倍光学系の製造方法を説明するためのフローチャートである。It is a flowchart for demonstrating the manufacturing method of the variable magnification optical system which concerns on this embodiment.

以下、本実施形態について、図面を参照しながら説明する。本実施形態に係る変倍光学系ＺＬは、図１に示すように、物体側から順に並んだ、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３とからなる。 Hereinafter, the present embodiment will be described with reference to the drawings. The variable magnification optical system ZL according to the present embodiment, as shown in FIG. 1, is a first lens group G1 having positive refractive power and a second lens group G2 having negative refractive power, which are arranged in order from the object side. And a third lens group G3 having a positive refractive power.

この構成により、広角端状態における鏡筒の小型化と、十分な変倍比の確保が達成できる。 With this configuration, downsizing of the barrel in the wide-angle end state and securing of a sufficient variable magnification ratio can be achieved.

本実施形態に係る変倍光学系ＺＬは、広角端状態から望遠端状態への変倍に際し、第１レンズ群Ｇ１を光軸方向に沿って物体方向に移動させる。 The variable magnification optical system ZL according to the present embodiment moves the first lens group G1 in the object direction along the optical axis during zooming from the wide-angle end state to the telephoto end state.

この構成により、十分な変倍比を確保することができる。 With this configuration, a sufficient variable magnification ratio can be secured.

本実施形態に係る変倍光学系ＺＬは、第３レンズ群Ｇ３の少なくとも一部を光軸方向に沿って移動させることにより合焦を行う。 The variable magnification optical system ZL according to the present embodiment performs focusing by moving at least a part of the third lens group G3 along the optical axis direction.

この構成により、合焦時の収差変動（例えば、球面収差）を抑えることができる。 With this configuration, it is possible to suppress aberration fluctuation (for example, spherical aberration) at the time of focusing.

そして、上記構成のもと、次の条件式（１）を満足する。 Then, based on the above configuration, the following conditional expression (1) is satisfied.

０．７３＜（−ｆ２）／ｆ３＜２．００ …（１）
但し、
ｆ２：第２レンズ群Ｇ２の焦点距離、
ｆ３：第３レンズ群Ｇ３の焦点距離。 0.73 <(− f2) / f3 <2.00 (1)
However,
f2: focal length of the second lens group G2,
f3: The focal length of the third lens group G3.

条件式（１）は、第３レンズ群Ｇ３の焦点距離に対する、適正な第２レンズ群Ｇ２の焦点距離を規定するものである。条件式（１）を満足することにより、良好な光学性能と、光学系の小型化を達成することができる。 Conditional expression (1) defines an appropriate focal length of the second lens group G2 with respect to the focal length of the third lens group G3. By satisfying the conditional expression (1), it is possible to achieve good optical performance and miniaturization of the optical system.

条件式（１）の下限値を下回ると、第２レンズ群Ｇ２の屈折力が強くなり、広角端状態におけるコマ収差、非点収差の補正が困難となるため好ましくない。 If the lower limit value of the conditional expression (1) is not reached, the refractive power of the second lens group G2 becomes strong, which makes it difficult to correct coma and astigmatism in the wide-angle end state.

条件式（１）の下限値を０．７５に設定することにより、本実施形態の効果を確実なものとすることができる。 By setting the lower limit value of conditional expression (1) to 0.75, the effect of the present embodiment can be made reliable.

条件式（１）の上限値を上回ると、第３レンズ群Ｇ３の屈折力が強くなり、望遠端状態における球面収差、コマ収差の補正が困難となるため好ましくない。 If the upper limit value of the conditional expression (1) is exceeded, the refractive power of the third lens group G3 becomes strong, which makes it difficult to correct spherical aberration and coma aberration in the telephoto end state, which is not preferable.

条件式（１）の上限値を１．２０に設定することにより、本実施形態の効果を確実なものとすることができる。 By setting the upper limit value of the conditional expression (1) to 1.20, the effect of the present embodiment can be made reliable.

本実施形態に係る変倍光学系ＺＬは、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔と、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔とを変化させることにより、変倍を行うことが好ましい。 The variable magnification optical system ZL according to the present embodiment changes the air gap between the first lens group G1 and the second lens group G2 and the air gap between the second lens group G2 and the third lens group G3. Preferably, scaling is performed.

この構成により、変倍時の球面収差、像面湾曲の変動を抑えつつ、十分な変倍比を確保することができる。 With this configuration, it is possible to secure a sufficient variable magnification ratio while suppressing variations in spherical aberration and field curvature at the time of zooming.

本実施形態に係る変倍光学系ＺＬにおいて、第３レンズ群Ｇ３は、物体側から順に並んだ、正の屈折力を有する第３Ａレンズ群Ｇ３Ａと、第３Ｂレンズ群Ｇ３Ｂとからなり、第３Ａレンズ群Ｇ３Ａを光軸方向に沿って移動させることにより合焦を行うことが好ましい。 In the variable magnification optical system ZL according to the present embodiment, the third lens group G3 includes, in order from the object side, a third A lens group G3A having positive refractive power and a third B lens group G3B. It is preferable to perform focusing by moving the lens group G3A along the optical axis direction.

本実施形態に係る変倍光学系ＺＬは、次の条件式（２）を満足することが好ましい。 It is preferable that the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (2).

１．００＜ｆ３Ａ／ｆ３＜４．００ …（２）
但し、
ｆ３Ａ：第３Ａレンズ群Ｇ３Ａの焦点距離。 1.00 <f3A / f3 <4.00 (2)
However,
f3A: The focal length of the third lens group G3A.

条件式（２）は、第３レンズ群Ｇ３の焦点距離に対する、適正な第３Ａレンズ群Ｇ３Ａの焦点距離を規定するものである。条件式（２）を満足することにより、合焦時の良好な光学性能と、光学系の小型化を達成することができる。 Conditional expression (2) defines an appropriate focal length of the third lens group G3A with respect to the focal length of the third lens group G3. By satisfying the conditional expression (2), it is possible to achieve good optical performance at the time of focusing and downsizing of the optical system.

条件式（２）の下限値を下回ると、第３レンズ群Ｇ３の屈折力が弱くなり、鏡筒の小型化が困難となる。小型化するために、第１レンズ群Ｇ１と第２レンズ群Ｇ２の屈折力を強くすると、コマ収差、非点収差、像面湾曲の補正が困難となるため好ましくない。 If the lower limit value of the conditional expression (2) is not reached, the refractive power of the third lens group G3 becomes weak, and it becomes difficult to miniaturize the lens barrel. It is not preferable to intensify the refractive powers of the first lens group G1 and the second lens group G2 in order to miniaturize the lens because correction of coma aberration, astigmatism and field curvature becomes difficult.

条件式（２）の下限値を１．５０に設定することにより、本実施形態の効果を確実なものとすることができる。 By setting the lower limit value of conditional expression (2) to 1.50, the effect of the present embodiment can be made reliable.

条件式（２）の上限値を上回ると、第３レンズ群Ｇ３の屈折力が強くなり、望遠端状態における球面収差、コマ収差の補正が困難となるため好ましくない。 If the upper limit value of the conditional expression (2) is exceeded, the refractive power of the third lens group G3 becomes strong, which makes it difficult to correct spherical aberration and coma aberration in the telephoto end state, which is not preferable.

条件式（２）の上限値を３．５０に設定することにより、本実施形態の効果を確実なものとすることができる。 By setting the upper limit value of the conditional expression (2) to 3.50, the effect of the present embodiment can be made reliable.

本実施形態に係る変倍光学系ＺＬにおいて、第３Ａレンズ群Ｇ３Ａは、単レンズからなることが好ましい。 In the variable magnification optical system ZL according to this embodiment, it is preferable that the third A lens group G3A be formed of a single lens.

この構成により、合焦機構の小型化を図ることができる。 With this configuration, the focusing mechanism can be miniaturized.

本実施形態に係る変倍光学系ＺＬは、次の条件式（３）を満足することが好ましい。 It is preferable that the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (3).

１．００＜｜ｆ３Ｂ｜／ｆ３＜５．００ …（３）
但し、
ｆ３Ｂ：第３Ｂレンズ群Ｇ３Ｂの焦点距離。 1.00 <| f3B | / f3 <5.00 (3)
However,
f3B: focal length of the third B lens group G3B.

条件式（３）は、第３レンズ群Ｇ３の焦点距離に対する、適正な第３Ｂレンズ群Ｇ３Ｂの焦点距離を規定するものである。条件式（３）を満足することにより、良好な光学性能と、光学系の小型化を達成することができる。 Conditional expression (3) defines an appropriate focal length of the third lens group G3B with respect to the focal length of the third lens group G3. By satisfying the conditional expression (3), good optical performance and miniaturization of the optical system can be achieved.

条件式（３）の下限値を下回ると、第３レンズ群Ｇ３の屈折力が弱くなり、鏡筒の小型化が困難となる。小型化するために、第１レンズ群Ｇ１と第２レンズ群Ｇ２の屈折力を強くすると、コマ収差、非点収差、像面湾曲の補正が困難となるため好ましくない。 If the lower limit value of the conditional expression (3) is not reached, the refractive power of the third lens group G3 becomes weak, and it becomes difficult to miniaturize the lens barrel. It is not preferable to intensify the refractive powers of the first lens group G1 and the second lens group G2 in order to miniaturize the lens because correction of coma aberration, astigmatism and field curvature becomes difficult.

条件式（３）の下限値を１．２０に設定することにより、本実施形態の効果を確実なものとすることができる。 By setting the lower limit value of the conditional expression (3) to 1.20, the effect of the present embodiment can be made reliable.

条件式（３）の上限値を上回ると、第３レンズ群Ｇ３の屈折力が強くなり、望遠端状態における球面収差、コマ収差の補正が困難となるため好ましくない。 If the upper limit value of the conditional expression (3) is exceeded, the refractive power of the third lens group G3 becomes strong, and it becomes difficult to correct spherical aberration and coma aberration in the telephoto end state, which is not preferable.

条件式（３）の上限値を３．００に設定することにより、本実施形態の効果を確実なものとすることができる。 By setting the upper limit value of the conditional expression (3) to 3.00, the effect of the present embodiment can be made reliable.

本実施形態に係る変倍光学系ＺＬは、第３Ｂレンズ群Ｇ３Ｂの少なくとも一部を、像ブレを補正するための防振レンズ群ＶＲとして、光軸と垂直方向の成分を持つように移動可能に構成することが好ましい。 The variable magnification optical system ZL according to the present embodiment can move at least a part of the third B lens group G3B so as to have a component in the direction perpendicular to the optical axis as a vibration reduction lens group VR for correcting image blurring. It is preferable to construct in

この構成により、像ブレ補正（防振）時において良好な光学性能を実現することができる。また、防振レンズ群ＶＲを含む、像ブレ補正機構の小型化を図ることができる。 With this configuration, good optical performance can be realized at the time of image shake correction (vibration reduction). Further, the image blur correction mechanism including the vibration reduction lens group VR can be miniaturized.

本実施形態に係る変倍光学系ＺＬにおいて、防振レンズ群ＶＲは、負の屈折力を有することが好ましい。 In the variable magnification optical system ZL according to the present embodiment, it is preferable that the vibration reduction lens group VR have negative refractive power.

この構成により、像ブレ補正（防振）時において良好な光学性能を実現することができる。 With this configuration, good optical performance can be realized at the time of image shake correction (vibration reduction).

本実施形態に係る変倍光学系ＺＬは、次の条件式（４）を満足することが好ましい。 It is preferable that the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (4).

２．００＜｜ｆｖｒ｜／ｆ３＜６．００ …（４）
但し、
ｆｖｒ：防振レンズ群ＶＲの焦点距離。 2.00 <| fvr | / f3 <6.00 (4)
However,
fvr: focal length of the anti-vibration lens unit VR.

条件式（４）は、第３レンズ群Ｇ３の焦点距離に対する、適正な防振レンズ群ＶＲの焦点距離を規定するものである。条件式（４）を満足することにより、像ブレ補正時における良好な光学性能と、光学系の小型化を達成することができる。 Conditional expression (4) defines an appropriate focal length of the vibration reduction lens group VR with respect to the focal length of the third lens group G3. By satisfying the conditional expression (4), it is possible to achieve good optical performance at the time of image shake correction and downsizing of the optical system.

条件式（４）の下限値を下回ると、第３レンズ群Ｇ３の屈折力が弱くなり、鏡筒の小型化が困難となる。小型化するために、第１レンズ群Ｇ１と第２レンズ群Ｇ２の屈折力を強くすると、コマ収差、非点収差、像面湾曲の補正が困難となるため好ましくない。 If the lower limit value of the conditional expression (4) is not reached, the refractive power of the third lens group G3 becomes weak, and it becomes difficult to miniaturize the lens barrel. It is not preferable to intensify the refractive powers of the first lens group G1 and the second lens group G2 in order to miniaturize the lens because correction of coma aberration, astigmatism and field curvature becomes difficult.

条件式（４）の下限値を２．５０に設定することにより、本実施形態の効果を確実なものとすることができる。 By setting the lower limit value of conditional expression (4) to 2.50, the effects of the present embodiment can be made reliable.

条件式（４）の上限値を上回ると、第３レンズ群Ｇ３の屈折力が強くなり、望遠端状態における球面収差、コマ収差の補正が困難となる。また、防振レンズ群ＶＲの屈折力が弱くなり、像ブレ補正（防振）時のシフト量が増え、鏡筒の小型化が困難となるため好ましくない。 If the upper limit value of the conditional expression (4) is exceeded, the refractive power of the third lens group G3 becomes strong, and it becomes difficult to correct spherical aberration and coma aberration in the telephoto end state. In addition, the refractive power of the vibration reduction lens group VR is weakened, the shift amount at the time of image shake correction (vibration reduction) is increased, and the lens barrel is difficult to miniaturize, which is not preferable.

条件式（４）の上限値を４．００に設定することにより、本実施形態の効果を確実なものとすることができる。 By setting the upper limit value of the conditional expression (4) to 4.00, the effect of the present embodiment can be made reliable.

本実施形態に係る変倍光学系ＺＬにおいて、防振レンズ群ＶＲは、単レンズからなることが好ましい。 In the variable magnification optical system ZL according to this embodiment, the vibration reduction lens group VR preferably includes a single lens.

この構成により、像ブレ補正機構を小型化することができる。 This configuration can miniaturize the image shake correction mechanism.

本実施形態に係る変倍光学系ＺＬは、絞りＳを有し、前記絞りＳは、変倍時に第３レンズ群Ｇ３と一体となって光軸方向に沿って移動することが好ましい。 It is preferable that the variable magnification optical system ZL according to this embodiment has a stop S, and the stop S moves integrally with the third lens group G3 along the optical axis direction at the time of zooming.

この構成により、鏡筒構造を簡素化でき、鏡筒の小型化を図ることができる。 With this configuration, the lens barrel structure can be simplified, and the lens barrel can be miniaturized.

本実施形態に係る変倍光学系ＺＬは、絞りＳを有し、前記絞りＳは、第２レンズ群Ｇ２と像面Ｉとの間に配置されていることが好ましい。 It is preferable that the variable magnification optical system ZL according to this embodiment has a stop S, and the stop S be disposed between the second lens group G2 and the image plane I.

この構成により、像面湾曲及び非点収差を良好に補正することができる。 By this configuration, field curvature and astigmatism can be corrected well.

本実施形態に係る変倍光学系ＺＬは、次の条件式（５）を満足することが好ましい。 It is preferable that the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (5).

３０．００° ＜ωｗ＜８０．００° …（５）
但し、
ωｗ：広角端状態における半画角。 30.00 ° <ωw <80.00 ° (5)
However,
ωw: Half angle of view in the wide-angle end state.

条件式（５）は、広角端状態における画角の値を規定する条件である。この条件式（５）を満足することにより、広い画角を有しつつ、コマ収差、歪曲収差、像面湾曲を良好に補正することができる。 Conditional expression (5) defines the value of the angle of view in the wide-angle end state. By satisfying the conditional expression (5), coma, distortion and curvature of field can be favorably corrected while having a wide angle of view.

条件式（５）の下限値を３３．００°に設定することにより、より良好な収差補正が可能になる。条件式（５）の下限値を３６．００°に設定することにより、さらに良好な収差補正が可能になる。 By setting the lower limit value of the conditional expression (5) to 33.00 °, better aberration correction can be performed. By setting the lower limit value of the conditional expression (5) to 36.00 °, even better aberration correction can be performed.

条件式（５）の上限値を７７．００°に設定することにより、より良好な収差補正が可能になる。 By setting the upper limit value of the conditional expression (5) to 77.00 °, better aberration correction can be performed.

本実施形態に係る変倍光学系ＺＬは、次の条件式（６）を満足することが好ましい。 It is preferable that the variable magnification optical system ZL according to the present embodiment satisfies the following conditional expression (6).

２．００＜ｆｔ／ｆｗ＜１５．００ …（６）
但し、
ｆｔ：望遠端状態の全系の焦点距離、
ｆｗ：広角端状態の全系の焦点距離。 2.00 <ft / fw <15.00 (6)
However,
ft: focal length of the entire system at the telephoto end,
fw: focal length of the entire system at the wide-angle end.

条件式（６）は、望遠端状態の全系の焦点距離と、広角端状態の全系の焦点距離との比を規定する条件である。本変倍光学系ＺＬは、条件式（６）を満足することにより、高いズーム比を得ることができるとともに、球面収差、コマ収差を良好に補正することができる。 Condition (6) defines the ratio of the focal length of the entire system at the telephoto end to the focal length of the entire system at the wide-angle end. By satisfying the conditional expression (6), the variable magnification optical system ZL can obtain a high zoom ratio, and can correct spherical aberration and coma aberration well.

条件式（６）の下限値を２．３０に設定することにより、より良好な収差補正が可能になる。条件式（６）の下限値を２．５０に設定することにより、さらに良好な収差補正が可能になる。条件式（６）の下限値を２．７０に設定することにより、本実施形態の効果を最大限に発揮できる。 By setting the lower limit value of conditional expression (6) to 2.30, better aberration correction becomes possible. By setting the lower limit value of conditional expression (6) to 2.50, it is possible to further correct aberration. By setting the lower limit value of the conditional expression (6) to 2.70, the effect of the present embodiment can be maximally exhibited.

条件式（６）の上限値を１０．００に設定することにより、より良好な収差補正が可能になる。条件式（６）の上限値を７．００に設定することにより、さらに良好な収差補正が可能になる。 By setting the upper limit value of conditional expression (6) to 10.00, better aberration correction becomes possible. By setting the upper limit value of the conditional expression (6) to 7.00, even better aberration correction is possible.

以上のような本実施形態によれば、高い光学性能を有する変倍光学系ＺＬを実現することができる。 According to the present embodiment as described above, it is possible to realize the variable magnification optical system ZL having high optical performance.

次に、図１３を参照しながら、上述の変倍光学系ＺＬを備えたカメラ（撮像装置）１について説明する。カメラ１は、図１３に示すように、撮影レンズ２として上述の変倍光学系ＺＬを備えたレンズ交換式のカメラ（所謂ミラーレスカメラ）である。 Next, the camera (image pickup apparatus) 1 provided with the above-described variable magnification optical system ZL will be described with reference to FIG. As shown in FIG. 13, the camera 1 is a lens interchangeable type camera (so-called mirrorless camera) provided with the above-described variable magnification optical system ZL as the photographing lens 2.

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、不図示のＯＬＰＦ（Optical low pass filter：光学ローパスフィルタ）を介して撮像部３の撮像面上に被写体像を形成する。そして、撮像部３に設けられた光電変換素子によって被写体像が光電変換されて被写体の画像が生成される。この画像は、カメラ１に設けられたＥＶＦ（Electronic view finder：電子ビューファインダ）４に表示される。これにより、撮影者はＥＶＦ４を介して被写体を観察することができる。 In the camera 1, light from an object (not shown) is collected by the photographing lens 2, and the object is picked up on the imaging surface of the imaging unit 3 via an OLPF (optical low pass filter) (not shown) Form an image. Then, the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate the image of the subject. This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1. Thereby, the photographer can observe the subject through the EVF 4.

また、撮影者によって不図示のレリーズボタンが押されると、撮像部３で生成された被写体の画像が不図示のメモリに記憶される。このようにして、撮影者は、本カメラ１による被写体の撮影を行うことができる。 When the photographer presses a release button (not shown), the image of the subject generated by the imaging unit 3 is stored in a memory (not shown). In this way, the photographer can shoot a subject with the real camera 1.

カメラ１に撮影レンズ２として搭載した本実施形態に係る変倍光学系ＺＬは、後述の各実施例からも分かるように、その特徴的なレンズ構成によって、高い光学性能を有している。したがって、本カメラ１によれば、高い光学性能を有する撮像装置を実現することができる。 The variable magnification optical system ZL according to this embodiment mounted on the camera 1 as the photographing lens 2 has high optical performance due to its characteristic lens configuration, as will be understood from each example described later. Therefore, according to the present camera 1, an imaging device having high optical performance can be realized.

なお、クイックリターンミラーを有し、ファインダ光学系によって被写体を観察する一眼レフタイプのカメラに、上述の変倍光学系ＺＬを搭載した場合でも、上記カメラ１と同様の効果を奏することができる。また、ビデオカメラに、上述の変倍光学系ＺＬを搭載した場合でも、上記カメラ１と同様の効果を奏することができる。 Even when the variable magnification optical system ZL described above is mounted on a single lens reflex type camera having a quick return mirror and observing a subject with a finder optical system, the same effect as the camera 1 can be obtained. Further, even when the above-described variable magnification optical system ZL is mounted on a video camera, the same effect as that of the camera 1 can be obtained.

続いて、図１４を参照しながら、上記構成の変倍光学系ＺＬの製造方法について概説する。まず、レンズ鏡筒内に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３とからなるように、各レンズを配置する（ステップＳＴ１０）。このとき、広角端状態から望遠端状態への変倍に際し、第１レンズ群Ｇ１が光軸方向に沿って物体方向に移動するように、各レンズを配置する（ステップＳＴ２０）。第３レンズ群Ｇ３の少なくとも一部を光軸方向に沿って移動させることにより合焦を行うように、各レンズを配置する（ステップＳＴ３０）。また、次の条件式（１）を満足するように、レンズ鏡筒内に各レンズを配置する（ステップＳＴ４０）。 Subsequently, a method of manufacturing the variable magnification optical system ZL having the above configuration will be outlined with reference to FIG. First, in the lens barrel, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, and the third lens group G3 having a positive refractive power. , Each lens is arranged (step ST10). At this time, upon zooming from the wide-angle end state to the telephoto end state, each lens is disposed such that the first lens group G1 moves in the object direction along the optical axis direction (step ST20). The respective lenses are arranged so as to focus by moving at least a part of the third lens group G3 along the optical axis direction (step ST30). Further, each lens is disposed in the lens barrel so as to satisfy the following conditional expression (1) (step ST40).

本実施形態におけるレンズ配置の一例を挙げると、図１に示すように、第１レンズ群Ｇ１として、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ１１と物体側に凸面を向けた正メニスカスレンズＬ１２との接合レンズを配置する。第２レンズ群Ｇ２として、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ２１と、両凹レンズＬ２２と、両凸レンズＬ２３と、物体側に凹面を向けた負メニスカスレンズＬ２４とを配置する。第３レンズ群Ｇ３として、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Ｌ３１と、両凸レンズＬ３２と両凹レンズＬ３３との接合レンズと、両凹レンズＬ３４と、両凸レンズＬ３５と、両凸レンズＬ３６と、物体側に凹面を向けた負メニスカスレンズＬ３７とを配置する。また、条件式（１）を満足するように、各レンズを配置する（条件式（１）の対応値は0.76）。 As an example of the lens arrangement in this embodiment, as shown in FIG. 1, as the first lens group G1, a negative meniscus lens L11 having a convex surface on the object side and a convex surface on the object side are sequentially arranged from the object side. A cemented lens with the positive meniscus lens L12 is disposed. As the second lens group G2, a negative meniscus lens L21 having a convex surface facing the object side, a biconcave lens L22, a biconvex lens L23, and a negative meniscus lens L24 having a concave surface facing the object side are disposed in order from the object side . As the third lens group G3, a positive meniscus lens L31 having a concave surface facing the object side, a cemented lens of a biconvex lens L32 and a biconcave lens L33, a biconcave lens L34, a biconvex lens L35, and a biconvex lens as the third lens group G3. L36 and a negative meniscus lens L37 with a concave surface facing the object side are disposed. Further, each lens is disposed so as to satisfy the conditional expression (1) (corresponding value of the conditional expression (1) is 0.76).

以上のような本実施形態に係る変倍光学系の製造方法によれば、高い光学性能を有する変倍光学系ＺＬを得ることができる。 According to the manufacturing method of the variable magnification optical system according to the present embodiment as described above, it is possible to obtain the variable magnification optical system ZL having high optical performance.

以下、本実施形態に係る各実施例について、図面に基づいて説明する。以下に、表１〜表３を示すが、これらは第１実施例〜第３実施例における各諸元の表である。 Hereinafter, each example according to the present embodiment will be described based on the drawings. Tables 1 to 3 are shown below, and these are tables of each item in the first to third examples.

図１、図５及び図９は、各実施例に係る変倍光学系ＺＬ（ＺＬ１〜ＺＬ３）の構成を示す断面図である。これら変倍光学系ＺＬ１〜ＺＬ３の断面図では、広角端状態（Ｗ）から望遠端状態（Ｔ）に変倍する際の各レンズ群の光軸に沿った移動軌跡を矢印で示す。 FIGS. 1, 5 and 9 are cross-sectional views showing the configuration of the variable magnification optical system ZL (ZL1 to ZL3) according to each example. In the sectional views of these variable magnification optical systems ZL1 to ZL3, movement loci along the optical axes of the respective lens units at the time of zooming from the wide angle end state (W) to the telephoto end state (T) are indicated by arrows.

第１実施例に係る図１に対する各参照符号は、参照符号の桁数の増大による説明の煩雑化を避けるため、実施例ごとに独立して用いている。ゆえに、他の実施例に係る図面と共通の参照符号を付していても、それらは他の実施例とは必ずしも共通の構成ではない。 Each reference numeral to FIG. 1 according to the first embodiment is used independently for each embodiment in order to avoid complication of explanation due to the increase of the number of digits of the reference code. Therefore, even if the reference numerals in common with the drawings according to the other embodiments are given, they are not necessarily common to the other embodiments.

各実施例では収差特性の算出対象として、ｄ線（波長587.5620nm）、ｇ線（波長435.8350nm）を選んでいる。 In each embodiment, the d-line (wavelength 587.5620 nm) and the g-line (wavelength 435.8350 nm) are selected as calculation targets of the aberration characteristic.

表中の［レンズデータ］において、面番号は光線の進行する方向に沿った物体側からの光学面の順序、ｒは各光学面の曲率半径、Ｄは各光学面から次の光学面（又は像面）までの光軸上の距離である面間隔、νｄは光学部材の材質のｄ線を基準とするアッベ数、ｎｄは光学部材の材質のｄ線に対する屈折率を示す。（可変）は可変の面間隔、曲率半径の「∞」は平面又は開口、（絞りＳ）は開口絞りＳを示す。空気の屈折率（ｄ線）「1.000000」は省略する。光学面が非球面である場合には、面番号の左側に「＊」を付し、曲率半径ｒの欄には近軸曲率半径を示す。 In [Lens data] in the table, the surface number is the order of the optical surfaces from the object side along the traveling direction of light, r is the radius of curvature of each optical surface, and D is the next optical surface from each optical surface (or The surface distance which is the distance on the optical axis up to the image plane), νd denotes the Abbe number based on the d-line of the material of the optical member, and nd denotes the refractive index for the d-line of the material of the optical member. (Variable) indicates a variable surface distance, the radius of curvature “∞” indicates a plane or an aperture, and (aperture S) indicates an aperture stop S. The refractive index (d line) "1.000000" of air is omitted. When the optical surface is an aspheric surface, “*” is attached to the left of the surface number, and the paraxial radius of curvature is shown in the column of radius of curvature r.

表中の［非球面データ］では、［レンズデータ］に示した非球面について、その形状を次式（ａ）で示す。ここで、ｙは光軸に垂直な方向の高さ、Ｘ（ｙ）は高さｙにおける光軸方向の変位量（サグ量）、ｒは基準球面の曲率半径（近軸曲率半径）、κは円錐定数、Ａｎは第ｎ次の非球面係数を示す。なお、「Ｅ-n」は「×１０^-n」を示し、例えば「1.234E-05」は「1.234×10^-5」を示す。 In [aspheric surface data] in the table, the shape of the aspheric surface shown in [lens data] is shown by the following equation (a). Here, y is the height in the direction perpendicular to the optical axis, X (y) is the displacement in the optical axis direction at the height y (sag amount), r is the radius of curvature of the reference spherical surface (paraxial radius of curvature), κ Represents a conical constant, and An represents an nth-order aspheric coefficient. Note that "E-n" indicates "x 10 ^-n ", for example "1.234 E-05" indicates "1.234 x 10 ^-5 ".

Ｘ（ｙ）＝（ｙ²／ｒ）／［１＋｛１−κ（ｙ²／ｒ²）｝^1/2］＋Ａ4×ｙ⁴＋Ａ6×ｙ⁶＋Ａ8×ｙ⁸＋Ａ10×ｙ¹⁰ …（ａ） X (y) = (y ² / r) / [1+ {1-κ (y ² / r ² )} ^1/2 ] + A4 × y ⁴ + A6 × y ⁶ + A8 × y ⁸ + A10 × y ¹⁰ (a)

表中の［各種データ］において、ｆはレンズ全系の焦点距離、ＦｎｏはＦナンバー、ωは半画角（単位：°）、Ｙは像高、ＴＬはレンズ系の全長（光軸上でのレンズ最前面から像面Ｉまでの距離）、Ｂｆはバックフォーカス（光軸上でのレンズ最終面から像面Ｉまでの距離）を示す。 In [Various data] in the table, f is the focal length of the whole lens system, Fno is the F number, ω is the half angle of view (unit: °), Y is the image height, TL is the total length of the lens system (on the optical axis) Bf indicates the back focus (the distance from the lens last surface to the image plane I on the optical axis).

表中の［可変間隔データ］において、無限遠物体及び近距離物体（撮影距離Ｒ＝1.0m）への合焦時の広角端状態、中間焦点距離状態及び望遠端状態における全系の焦点距離ｆ又は撮影倍率βと、各可変間隔の値を示す。なお、Ｄ０は物体面から第１面までの距離、Ｄｉ（但し、ｉは整数）は第ｉ面と第（ｉ＋１）面の可変間隔を示す。 In [Variable distance data] in the table, the focal length f of the entire system in the wide-angle end state, the intermediate focal length state and the telephoto end state when focusing on an infinite distance object and a near distance object (shooting distance R = 1.0 m) Alternatively, the imaging magnification β and the value of each variable interval are shown. D0 is the distance from the object plane to the first plane, and Di (where i is an integer) indicates the variable distance between the ith plane and the (i + 1) plane.

表中の［レンズ群データ］において、群初面に各群の始面番号（最も物体側の面番号）、群焦点距離に各群の焦点距離を示す。 In [Lens group data] in the table, the initial surface number of each group (the surface number on the most object side) is shown on the group initial surface, and the focal length of each group is shown on the group focal length.

表中の［条件式対応値］において、上記の条件式（１）〜（６）に対応する値を示す。 In [Conditional expression corresponding value] in the table, values corresponding to the above conditional expressions (1) to (6) are shown.

以下、全ての諸元値において、掲載されている焦点距離ｆ、曲率半径ｒ、面間隔Ｄ、その他の長さ等は、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」に限定されることなく、他の適当な単位を用いることが可能である。 Hereinafter, in all the specification values, “mm” is generally used unless otherwise specified for the focal length f, radius of curvature r, surface distance D, other lengths, etc. listed, but the optical system is proportionally expanded. Alternatively, since the same optical performance can be obtained by proportional reduction, it is not limited to this. Also, the unit is not limited to "mm", and other appropriate units can be used.

ここまでの表の説明は全ての実施例において共通であり、以下での説明を省略する。 The description of the tables so far is common to all the embodiments, and the description below is omitted.

（第１実施例）
第１実施例について、図１〜図４及び表１を用いて説明する。第１実施例に係る変倍光学系ＺＬ（ＺＬ１）は、図１に示すように、光軸に沿って物体側から順に並んだ、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する持つ第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３とから構成される。 (First embodiment)
A first embodiment will be described with reference to FIGS. 1 to 4 and Table 1. The variable magnification optical system ZL (ZL1) according to the first example, as shown in FIG. 1, includes a first lens group G1 having positive refractive power, which is arranged in order from the object side along the optical axis; It is comprised from the 2nd lens group G2 which has refractive power, and the 3rd lens group G3 which has positive refractive power.

第１レンズ群Ｇ１は、物体側から順に並んだ、物体側に凸面を向けた負メニスカスレンズＬ１１と物体側に凸面を向けた正メニスカスレンズＬ１２との接合レンズから構成される。 The first lens group G1 is composed of, in order from the object side, a cemented lens of a negative meniscus lens L11 with a convex surface facing the object side and a positive meniscus lens L12 with a convex surface facing the object side.

第２レンズ群Ｇ２は、物体側から順に並んだ、物体側に凸面を向けた負メニスカスレンズＬ２１と、両凹レンズＬ２２と、両凸レンズＬ２３と、物体側に凹面を向けた負メニスカスレンズＬ２４とから構成される。 The second lens group G2 is composed of, in order from the object side, a negative meniscus lens L21 with a convex surface facing the object side, a biconcave lens L22, a biconvex lens L23, and a negative meniscus lens L24 with a concave surface facing the object side Configured

第３レンズ群Ｇ３は、物体側から順に並んだ、正の屈折力を有する第３Ａレンズ群Ｇ３Ａと、第３Ｂレンズ群Ｇ３Ｂとから構成される。 The third lens group G3 is composed of, in order from the object side, a third A lens group G3A having positive refractive power and a third B lens group G3B.

第３Ａレンズ群Ｇ３Ａ（合焦群）は、物体側に凹面を向けた正メニスカスレンズＬ３１から構成される。第３Ｂレンズ群Ｇ３Ｂは、物体側から順に並んだ、両凸レンズＬ３２と両凹レンズＬ３３との接合レンズと、両凹レンズＬ３４と、両凸レンズＬ３５と、両凸レンズＬ３６と、物体側に凹面を向けた負メニスカスレンズＬ３７とから構成される。 The third A lens group G3A (focusing group) is composed of a positive meniscus lens L31 having a concave surface facing the object side. The third B lens group G3B is a cemented lens of a biconvex lens L32 and a biconcave lens L33, a biconcave lens L34, a biconvex lens L35, a biconvex lens L36, and a negative concave surface facing the object side, which are arranged in order from the object side And a meniscus lens L37.

Ｆナンバーを決定する開口絞りＳは、第３レンズ群Ｇ３中に設けられている。 An aperture stop S for determining the F number is provided in the third lens group G3.

像面Ｉは、不図示の撮像素子上に形成され、該撮像素子はＣＣＤやＣＭＯＳ等から構成される。 The image plane I is formed on an imaging device (not shown), and the imaging device is configured of a CCD, a CMOS or the like.

第１実施例に係る変倍光学系ＺＬ１は、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔と、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔とを変化させることにより、広角端状態から望遠端状態への変倍を行う。このとき、像面Ｉに対して、第１レンズ群Ｇ１は物体側へ単調に移動する。第２レンズ群Ｇ２は、像側に凸状の軌跡を描くように光軸に沿って移動する。第３レンズ群Ｇ３は、物体側へ単調に移動する。開口絞りＳは、変倍に際して、第３レンズ群Ｇ３と一体となって物体側へ単調に移動する。 The variable magnification optical system ZL1 according to Example 1 changes the air gap between the first lens group G1 and the second lens group G2 and the air gap between the second lens group G2 and the third lens group G3. Thus, zooming from the wide-angle end state to the telephoto end state is performed. At this time, with respect to the image plane I, the first lens group G1 moves monotonously to the object side. The second lens group G2 moves along the optical axis so as to draw a convex locus on the image side. The third lens group G3 moves monotonously to the object side. The aperture stop S moves monotonously to the object side together with the third lens group G3 during zooming.

詳細には、第１実施例に係る変倍光学系ＺＬ１は、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔が縮小するように、各レンズ群Ｇ１〜Ｇ３を光軸に沿って移動させることにより、広角端状態から望遠端状態までの変倍を行う。 In detail, in the variable magnification optical system ZL1 according to the first example, the air interval between the first lens group G1 and the second lens group G2 is enlarged, and the air between the second lens group G2 and the third lens group G3 is By changing the lens groups G1 to G3 along the optical axis so as to reduce the distance, the magnification change from the wide-angle end state to the telephoto end state is performed.

第１実施例に係る変倍光学系ＺＬ１は、第３Ａレンズ群Ｇ３Ａ、すなわち物体側に凹面を向けた正メニスカスレンズＬ３１を光軸方向に沿って移動させることにより合焦を行う構成であり、図１の矢印に示すように、無限遠物体に合焦した状態から近距離物体へ合焦する状態に変化させたときに、正メニスカスレンズＬ３１は物体側から像側へ移動する。 The variable magnification optical system ZL1 according to the first example is configured to perform focusing by moving the third lens group G3A, that is, the positive meniscus lens L31 having a concave surface facing the object side, along the optical axis direction. As shown by the arrows in FIG. 1, when changing from focusing on an object at infinity to focusing on a near object, the positive meniscus lens L31 moves from the object side to the image side.

像ブレ発生時には、防振レンズ群ＶＲとして、第３Ｂレンズ群Ｇ３Ｂの両凹レンズＬ３４を、光軸と垂直方向の成分を持つように移動させることにより、像面Ｉ上の像ブレ補正（防振）を行う。 When an image blur occurs, the image blur correction (image stabilization) on the image plane I is performed by moving the biconcave lens L34 of the third B lens group G3B as a vibration reduction lens group VR so as to have a component in the direction perpendicular to the optical axis. )I do.

下記の表１に、第１実施例における各諸元の値を示す。表１における面番号１〜２５が、図１に示すｍ１〜ｍ２５の各光学面に対応している。 Table 1 below shows values of respective items in the first embodiment. The surface numbers 1 to 25 in Table 1 correspond to the optical surfaces m1 to m25 shown in FIG.

（表１）
［レンズデータ］
面番号ｒＤ νｄｎｄ
1 41.994 1.800 23.80 1.846660
2 31.917 6.967 67.90 1.593190
3 1604.312 D3(可変)
4 79.168 1.500 32.35 1.850260
5 11.927 5.219
6 -52.994 1.000 42.73 1.834810
7 32.701 0.418
8 22.013 4.124 23.80 1.846660
9 -31.216 0.747
10 -21.084 1.000 42.73 1.834810
11 -79.290 D11(可変)
12 -459.370 1.607 49.62 1.772500
13 -32.039 D13(可変)
14 ∞ 2.000 (絞りＳ)
15 11.886 6.181 82.57 1.497820
16 -23.884 0.800 23.80 1.846660
17 297.976 2.028
18 -1480.750 0.800 49.62 1.772500
19 47.464 1.000
20 76.691 6.975 38.03 1.603420
21 -38.339 0.200
22 83.747 2.496 50.27 1.719990
23 -62.763 2.711
24 -9.776 1.000 42.73 1.834810
25 -16.921 Bf

［各種データ］
ｆ 18.500 35.000 53.500
Ｆｎｏ 3.747 4.644 5.669
ω 39.556 21.350 14.391
Ｙ 14.250 14.250 14.250
ＴＬ 88.166 99.495 109.353
Ｂｆ 17.445 26.392 35.677

［可変間隔データ］
（無限遠）（撮影距離１ｍ）
広角端中間望遠端広角端中間望遠端
f,β 18.500 35.000 53.500 -0.0196 -0.0365 -0.0554
D0 0.000 0.000 0.000 911.8 900.5 890.6
D1 1.086 12.752 18.159 1.086 12.752 18.159
D11 15.129 5.845 1.011 15.637 6.644 2.065
D13 3.924 3.924 3.924 3.416 3.125 2.871

［レンズ群データ］
群番号群初面群焦点距離
Ｇ１ 1 83.101
Ｇ２ 4 -15.594
Ｇ３ 12 20.444

［条件式対応値］
条件式（１）：（−ｆ２）／ｆ３＝ 0.76
条件式（２）：ｆ３Ａ／ｆ３＝ 2.18
条件式（３）：｜ｆ３Ｂ｜／ｆ３＝ 1.88
条件式（４）：｜ｆｖｒ｜／ｆ３＝ 2.91
条件式（５）：ωｗ＝ 39.556
条件式（６）：ｆｔ／ｆｗ＝ 2.89 (Table 1)
[Lens data]
Face number r D ν d nd
1 41.994 1.800 23.80 1.846660
2 31.917 6.967 67.90 1.593190
3 1604.312 D3 (variable)
4 79.168 1.500 32.35 1.850260
5 11.927 5.219
6-52.994 1.000 42.73 1.834810
7 32.701 0.418
8 22.013 4.124 23.80 1.846660
9-31.216 0.747
10-21.084 1.000 42.73 1.834810
11 -79.290 D11 (variable)
12 -459.370 1.607 49.62 1.772500
13-32.039 D13 (variable)
14 ∞ 2.000 (aperture S)
15 11.1.86 6.181 82.57 1.497820
16 -23.884 0.800 23.80 1.846660
17 299.776 2.028
18-1480.750 0.800 49.62 1.772500
19 47.464 1.000
20 76.691 6.975 38.03 1.603420
21 -38.339 0.200
22 83.747 2.496 50.27 1.719990
23 -62.763 2.711
24-9.776 1.000 42.73 1.834810
25-16.921 Bf

[Various data]
f 18.500 35.000 53.500
Fno 3.747 4.644 5.669
ω 39.556 21.350 14.391
Y 14.250 14.250 14.250
TL 88.166 99.495 109.353
Bf 17.445 26.392 35.677

[Variable interval data]
(Infinity) (shooting distance 1 m)
Wide-angle end Middle Telephoto end Wide-angle end Mid Telephoto end
f, β 18. 500 35.000 53. 500-0.0196-0.0365-0.0554
D0 0.000 0.000 0.000 911.8 900.5 890.6
D1 1.086 12.752 18.159 1.086 12.752 18.159
D11 15.129 5.845 1.011 15.637 6.644 2.065
D13 3.924 3.924 3.924 3.416 3.125 2.871

[Lens group data]
Group number Group initial surface Group focal length G1 1 83.101
G2 4-15.594
G3 12 20.444

[Conditional expression corresponding value]
Conditional Expression (1): (−f 2) / f 3 = 0.76
Conditional Expression (2): f3A / f3 = 2.18
Conditional Expression (3): | f3B | / f3 = 1.88
Conditional Expression (4): | fvr | / f3 = 2.91
Conditional Expression (5): ω w = 39.556
Conditional Expression (6): ft / fw = 2.89

表１から、第１実施例に係る変倍光学系ＺＬ１は、上記条件式（１）〜（６）を満たすことが分かる。 From Table 1, it can be seen that the variable magnification optical system ZL1 according to the first example satisfies the conditional expressions (1) to (6).

図２は、第１実施例に係る変倍光学系ＺＬ1の広角端状態（ｆ＝18.500）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0196）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。図３は、第１実施例に係る変倍光学系ＺＬ１の中間焦点距離状態（ｆ＝35.000）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0365）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。図４は、第１実施例に係る変倍光学系ＺＬ１の望遠端状態（ｆ＝53.500）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0554）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。本実施例では、防振時の光学性能を、図２（ｃ）、図３（ｃ）及び図４（ｃ）のように、像高ｙ＝0.0を中心に、上下プラスマイナスの像高10.00に対応したコマ収差図で示す。 FIG. 2 is an aberration diagram in the wide-angle end state (f = 18.500) of the variable magnification optical system ZL1 according to the first example, (a) various aberrations when focusing on infinity, (b) shows near distance focusing (C) shows a coma aberration diagram at the time of image blur correction (correction angle θ = 0.30 °) at infinity focusing (focusing magnification β = −0.0196). 3A and 3B are aberration diagrams at the intermediate focal length state (f = 35.000) of the variable magnification optical system ZL1 according to the first example, and FIG. 3A shows various aberrations at the time of infinity focusing, and FIG. (C) shows a coma aberration diagram at the time of image blur correction (correction angle θ = 0.30 °) at infinity focusing (focusing magnification β = −0.0365). FIG. 4 is an aberration diagram in the telephoto end state (f = 53.500) of the zoom optical system ZL1 according to the first example, (a) various aberrations in in-focus at point, (b) shows near-field focus (C) shows a coma aberration diagram at the time of image blur correction (correction angle θ = 0.30 °) at infinity focusing (focusing magnification β = −0.0554). In this embodiment, as shown in FIGS. 2C, 3C, and 4C, the optical performance at the time of image stabilization is an image height of 10.00 in the upper and lower plus or minus centering on the image height y = 0.0. It shows in the coma aberration figure corresponding to.

各収差図において、ＦＮＯはＦナンバー、ＮＡは第１レンズ群Ｇ１に入射する光線の開口数、Ａは光線入射角すなわち半画角（単位：°）、Ｈ０は物体高（単位：mm）、Ｙは像高、ｄはｄ線における収差、ｇはｇ線における収差を示す。ｄ、ｇの記載のないものは、ｄ線における収差を示す。球面収差図において、実線は球面収差を、破線は正弦条件を示す。非点収差図において、実線はサジタル像面、破線はメリジオナル像面を示す。コマ収差図において、実線はメリジオナルコマを示す。以上の収差図の説明は、他の実施例においても同様とし、その説明を省略する。 In each aberration diagram, FNO is an F number, NA is a numerical aperture of a light beam incident on the first lens group G1, A is a light beam incident angle, that is, a half angle of view (unit: °), H0 is an object height (unit: mm), Y represents an image height, d represents an aberration at d-line, and g represents an aberration at g-line. Those not described in d and g show an aberration at the d-line. In the spherical aberration diagram, the solid line indicates the spherical aberration and the broken line indicates the sine condition. In astigmatism diagrams, a solid line indicates a sagittal image plane, and a broken line indicates a meridional image plane. In coma aberration diagrams, a solid line indicates meridional coma. The description of the above aberration diagrams is the same as in the other examples, and the description thereof is omitted.

図２〜図４に示す各収差図から、第１実施例に係る変倍光学系ＺＬ１は、広角端状態から望遠端状態にわたり諸収差が良好に補正され、高い結像性能を有することが分かる。また、像ブレ補正時にも高い結像性能を有することが分かる。 It is understood from the respective aberration diagrams shown in FIGS. 2 to 4 that the variable magnification optical system ZL1 according to Example 1 has good imaging performance with various aberrations corrected well from the wide-angle end state to the telephoto end state. . In addition, it can be seen that high imaging performance is obtained also at the time of image shake correction.

（第２実施例）
第２実施例について、図５〜図８及び表２を用いて説明する。第２実施例に係る変倍光学系ＺＬ（ＺＬ２）は、図５に示すように、光軸に沿って物体側から順に並んだ、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する持つ第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３とから構成される。 Second Embodiment
The second embodiment will be described with reference to FIGS. 5 to 8 and Table 2. As shown in FIG. 5, the variable magnification optical system ZL (ZL2) according to the second example has a first lens group G1 having a positive refractive power, which is arranged in order from the object side along the optical axis; It is comprised from the 2nd lens group G2 which has refractive power, and the 3rd lens group G3 which has positive refractive power.

第３Ａレンズ群Ｇ３Ａ（合焦群）は、物体側に凹面を向けた正メニスカスレンズＬ３１から構成される。第３Ｂレンズ群Ｇ３Ｂは、物体側から順に並んだ、両凸レンズＬ３２と物体側に凹面を向けた負メニスカスレンズＬ３３との接合レンズと、物体側に凸面を向けた負メニスカスレンズＬ３４と、両凸レンズＬ３５と、物体側に凹面を向けた負メニスカスレンズＬ３６とから構成される。 The third A lens group G3A (focusing group) is composed of a positive meniscus lens L31 having a concave surface facing the object side. The third B lens group G3B includes, in order from the object side, a cemented lens of a biconvex lens L32 and a negative meniscus lens L33 with a concave surface facing the object side, a negative meniscus lens L34 with a convex surface facing the object side, and a biconvex lens It comprises L35 and a negative meniscus lens L36 with a concave surface facing the object side.

第２実施例に係る変倍光学系ＺＬ２は、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔と、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔とを変化させることにより、広角端状態から望遠端状態への変倍を行う。このとき、像面Ｉに対して、第１レンズ群Ｇ１は物体側へ単調に移動する。第２レンズ群Ｇ２は、物体側へ単調に移動する。第３レンズ群Ｇ３は、物体側へ単調に移動する。開口絞りＳは、変倍に際して、第３レンズ群Ｇ３と一体となって物体側へ単調に移動する。 The variable magnification optical system ZL2 according to the second example changes the air gap between the first lens group G1 and the second lens group G2 and the air gap between the second lens group G2 and the third lens group G3. Thus, zooming from the wide angle end state to the telephoto end state is performed. At this time, with respect to the image plane I, the first lens group G1 moves monotonously to the object side. The second lens group G2 moves monotonously to the object side. The third lens group G3 moves monotonously to the object side. The aperture stop S moves monotonously to the object side together with the third lens group G3 during zooming.

詳細には、第２実施例に係る変倍光学系ＺＬ２は、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔が縮小するように、各レンズ群Ｇ１〜Ｇ３を光軸に沿って移動させることにより、広角端状態から望遠端状態までの変倍を行う。 Specifically, in the variable magnification optical system ZL2 according to the second example, the air gap between the first lens group G1 and the second lens group G2 is enlarged, and the air between the second lens group G2 and the third lens group G3 is By changing the lens groups G1 to G3 along the optical axis so as to reduce the distance, the magnification change from the wide-angle end state to the telephoto end state is performed.

第２実施例に係る変倍光学系ＺＬ２は、第３Ａレンズ群Ｇ３Ａ、すなわち物体側に凹面を向けた正メニスカスレンズＬ３１を光軸方向に沿って移動させることにより合焦を行う構成であり、図５の矢印に示すように、無限遠物体に合焦した状態から近距離物体へ合焦する状態に変化させたときに、正メニスカスレンズＬ３１は物体側から像側へ移動する。 The variable magnification optical system ZL2 according to the second example is configured to perform focusing by moving the third lens group G3A, that is, the positive meniscus lens L31 having a concave surface facing the object side, along the optical axis direction. As shown by the arrows in FIG. 5, when changing from focusing on an object at infinity to focusing on a near object, the positive meniscus lens L31 moves from the object side to the image side.

像ブレ発生時には、防振レンズ群ＶＲとして、第３Ｂレンズ群Ｇ３Ｂの物体側に凸面を向けた負メニスカスレンズＬ３４を光軸と垂直方向の成分を持つように移動させることにより、像面Ｉ上の像ブレ補正（防振）を行う。 When an image blur occurs, the negative meniscus lens L34 with the convex surface facing the object side of the third B lens group G3B is moved so as to have a component in the direction perpendicular to the optical axis as an image stabilizing lens group VR. Perform image stabilization (vibration reduction).

下記の表２に、第２実施例における各諸元の値を示す。表２における面番号１〜２３が、図５に示すｍ１〜ｍ２３の各光学面に対応している。 Table 2 below shows values of respective items in the second embodiment. The surface numbers 1 to 23 in Table 2 correspond to the optical surfaces of m1 to m23 shown in FIG. 5.

（表２）
［レンズデータ］
面番号ｒＤ νｄｎｄ
1 45.608 1.800 23.80 1.846660
2 33.721 6.519 67.90 1.593190
3 45648.551 D3(可変)
4 45.310 1.500 32.35 1.850260
5 11.154 5.514
6 -66.392 1.000 42.73 1.834810
7 28.177 0.200
8 19.025 4.190 23.80 1.846660
9 -36.189 0.897
10 -20.633 1.000 42.73 1.834810
11 -125.484 D11(可変)
12 -244.725 1.512 42.73 1.834810
13 -35.967 D13(可変)
14 ∞ 2.000 (絞りＳ)
15 11.692 7.246 82.57 1.497820
16 -15.635 0.800 23.80 1.846660
17 -55.007 2.028
18 119.072 0.800 55.52 1.696800
19 30.792 1.886
20 46.232 7.366 34.92 1.801000
21 -29.295 2.129
22 -9.299 1.000 35.72 1.902650
23 -17.109 Bf

［各種データ］
ｆ 18.500 34.176 53.500
Ｆｎｏ 3.606 4.649 5.743
ω 38.474 21.695 14.318
Ｙ 14.250 14.250 14.250
ＴＬ 84.418 96.972 109.393
Ｂｆ 17.330 26.452 35.995

［可変間隔データ］
（無限遠）（撮影距離１ｍ）
広角端中間望遠端広角端中間望遠端
f,β 18.500 34.176 53.500 -0.0196 -0.0358 -0.0556
D0 0.000 0.000 0.000 915.6 903.0 890.6
D3 1.003 12.242 19.287 1.003 12.242 19.287
D11 12.973 5.166 1.000 13.423 5.869 1.977
D13 3.717 3.717 3.717 3.266 3.013 2.739

［レンズ群データ］
群番号群初面群焦点距離
Ｇ１ 1 89.519
Ｇ２ 4 -14.853
Ｇ３ 12 18.756

［条件式対応値］
条件式（１）：（−ｆ２）／ｆ３＝ 0.79
条件式（２）：ｆ３Ａ／ｆ３＝ 2.68
条件式（３）：｜ｆ３Ｂ｜／ｆ３＝ 1.64
条件式（４）：｜ｆｖｒ｜／ｆ３＝ 3.19
条件式（５）：ωｗ＝ 38.474
条件式（６）：ｆｔ／ｆｗ＝ 2.89 (Table 2)
[Lens data]
Face number r D ν d nd
1 45.608 1.800 23.80 1.846660
2 33.721 6.519 67.90 1.593190
3 45648.551 D3 (variable)
4 45.310 1.500 32.35 1.850260
5 11.154 5.514
6-66.392 1.000 42.73 1.834810
7 28.177 0.200
8 19.025 4.190 23.80 1.846660
9 -36.189 0.897
10-20.633 1.000 42.73 1.834810
11 -125.484 D11 (variable)
12 -244.725 1.512 42.73 1.834810
13-35.967 D13 (variable)
14 ∞ 2.000 (aperture S)
15 11.692 7.246 82.57 1.497820
16-15.635 0.800 23.80 1.846660
17-55.007 2.028
18 119.072 0.800 55.52 1.696800
19 30.792 1.886
20 46.232 7.366 34.92 1.801000
21 -29.295 2.129
22 -9.299 1.000 35.72 1.902650
23-17.109 Bf

[Various data]
f 18.500 34.176 53.500
Fno 3.606 4.649 5.743
ω 38.474 21.695 14.318
Y 14.250 14.250 14.250
TL 84.418 96.972 109.393
Bf 17.330 26.452 35.995

[Variable interval data]
(Infinity) (shooting distance 1 m)
Wide-angle end Middle Telephoto end Wide-angle end Mid Telephoto end
f, β 18.500 34.176 53.500-0.0196 -0.0358-0.0556
D0 0.000 0.000 0.000 915.6 903.0 890.6
D3 1.003 12.242 19.287 1.003 12.242 19.287
D11 12.973 5.166 1.000 13.423 5.869 1.977
D13 3.717 3.717 3.717 3.266 3.013 2.739

[Lens group data]
Group number Group initial surface Group focal length G1 1 89.519
G2 4-14.853
G3 12 18.756

[Conditional expression corresponding value]
Conditional Expression (1): (−f 2) / f 3 = 0.79
Conditional Expression (2): f3A / f3 = 2.68
Conditional Expression (3): | f3B | / f3 = 1.64
Conditional Expression (4): | fvr | / f3 = 3.19
Condition (5): ω w = 38.474
Conditional Expression (6): ft / fw = 2.89

表２から、第２実施例に係る変倍光学系ＺＬ２は、上記条件式（１）〜（６）を満たすことが分かる。 From Table 2, it can be seen that the variable magnification optical system ZL2 according to the second example satisfies the conditional expressions (1) to (6).

図６は、第２実施例に係る変倍光学系ＺＬ２の広角端状態（ｆ＝18.500）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0196）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。図７は、第２実施例に係る変倍光学系ＺＬ２の中間焦点距離状態（ｆ＝34.176）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0358）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。図８は、第２実施例に係る変倍光学系ＺＬ２の望遠端状態（ｆ＝53.500）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0556）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。本実施例では、防振時の光学性能を、図６（ｃ）、図７（ｃ）及び図８（ｃ）のように、像高ｙ＝0.0を中心に、上下プラスマイナスの像高10.0に対応したコマ収差図で示す。 FIG. 6 is an aberration drawing of the zoom optical system ZL2 according to the second example at the wide-angle end (f = 18.500), (a) various aberrations at infinity focus, (b) near-field focus (C) shows a coma aberration diagram at the time of image blur correction (correction angle θ = 0.30 °) at infinity focusing (focusing magnification β = −0.0196). FIG. 7 is an aberration diagram in the intermediate focal length state (f = 34.176) of the variable magnification optical system ZL2 according to the second example, (a) various aberrations when in infinity focusing, (b) at a short distance (C) shows a coma aberration diagram at the time of image blur correction (correction angle θ = 0.30 °) at infinity focusing (focusing magnification β = −0.0358). FIG. 8 is an aberration drawing of the zoom optical system ZL2 of the second example at the telephoto end (f = 53.500), (a) various aberrations in in-focus condition, (b) shows the close distance (C) shows a coma aberration diagram at the time of image blur correction (correction angle θ = 0.30 °) at infinity focusing (focusing magnification β = −0.0556). In this embodiment, as shown in FIGS. 6C, 7C, and 8C, the optical performance at the time of image stabilization is an image height 10.0 of up and down plus and minus centering on the image height y = 0.0. It shows in the coma aberration figure corresponding to.

図６〜図８に示す各収差図から、第２実施例に係る変倍光学系ＺＬ２は、広角端状態から望遠端状態にわたり諸収差が良好に補正され、高い結像性能を有することが分かる。また、像ブレ補正時にも高い結像性能を有することが分かる。 From the respective aberration diagrams shown in FIG. 6 to FIG. 8, it is understood that the variable magnification optical system ZL2 according to the second example has various imaging characteristics well corrected from the wide-angle end state to the telephoto end state and has high imaging performance. . In addition, it can be seen that high imaging performance is obtained also at the time of image shake correction.

（第３実施例）
第３実施例について、図９〜図１２及び表３を用いて説明する。第３実施例に係る変倍光学系ＺＬ（ＺＬ３）は、図９に示すように、光軸に沿って物体側から順に並んだ、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する持つ第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３とから構成される。 Third Embodiment
The third embodiment will be described with reference to FIGS. 9 to 12 and Table 3. The variable magnification optical system ZL (ZL3) according to the third example is, as shown in FIG. 9, a first lens group G1 having a positive refractive power and arranged in order from the object side along the optical axis; It is comprised from the 2nd lens group G2 which has refractive power, and the 3rd lens group G3 which has positive refractive power.

第１レンズ群Ｇ１は、物体側から順に並んだ、物体側に凸面を向けた負メニスカスレンズＬ１１と両凸レンズＬ１２との接合レンズから構成される。 The first lens group G1 is composed of a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12, which are arranged in order from the object side.

第２レンズ群Ｇ２は、物体側から順に並んだ、物体側に凸面を向けた負メニスカスレンズＬ２１と、両凹レンズＬ２２と、物体側に凸面を向けた正メニスカスレンズＬ２３とから構成される。負メニスカスレンズＬ２１の物体側面は、非球面である。 The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, a biconcave lens L22, and a positive meniscus lens L23 having a convex surface facing the object side. The object side surface of the negative meniscus lens L21 is aspheric.

第３Ａレンズ群Ｇ３Ａ（合焦群）は、両凸レンズＬ３１から構成される。第３Ｂレンズ群Ｇ３Ｂは、物体側から順に並んだ、両凸レンズＬ３２と物体側に凹面を向けた負メニスカスレンズＬ３３との接合レンズと、物体側に凸面を向けた負メニスカスレンズＬ３４と、両凸レンズＬ３５と、物体側に凹面を向けた負メニスカスレンズＬ３６とから構成される。負メニスカスレンズＬ３４の物体側面は、非球面である。負メニスカスレンズＬ３６の物体側面は、非球面である。 The third lens group G3A (focusing group) is composed of a biconvex lens L31. The third B lens group G3B includes, in order from the object side, a cemented lens of a biconvex lens L32 and a negative meniscus lens L33 with a concave surface facing the object side, a negative meniscus lens L34 with a convex surface facing the object side, and a biconvex lens It comprises L35 and a negative meniscus lens L36 with a concave surface facing the object side. The object side surface of the negative meniscus lens L34 is aspheric. The object side surface of the negative meniscus lens L36 is aspheric.

第３実施例に係る変倍光学系ＺＬ３は、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔と、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔とを変化させることにより、広角端状態から望遠端状態への変倍を行う。このとき、像面Ｉに対して、第１レンズ群Ｇ１は物体側へ単調に移動する。第２レンズ群Ｇ２は、物体側へ単調に移動する。第３レンズ群Ｇ３は、物体側へ単調に移動する。開口絞りＳは、変倍に際して、第３レンズ群Ｇ３と一体となって物体側へ単調に移動する。 The variable magnification optical system ZL3 according to the third example changes the air gap between the first lens group G1 and the second lens group G2 and the air gap between the second lens group G2 and the third lens group G3. Thus, zooming from the wide-angle end state to the telephoto end state is performed. At this time, with respect to the image plane I, the first lens group G1 moves monotonously to the object side. The second lens group G2 moves monotonously to the object side. The third lens group G3 moves monotonously to the object side. The aperture stop S moves monotonously to the object side together with the third lens group G3 during zooming.

詳細には、第３実施例に係る変倍光学系ＺＬ３は、第１レンズ群Ｇ１と第２レンズ群Ｇ２との空気間隔が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３との空気間隔が縮小するように、各レンズ群Ｇ１〜Ｇ３を光軸に沿って移動させることにより、広角端状態から望遠端状態までの変倍を行う。 In detail, in the variable magnification optical system ZL3 according to the third example, the air gap between the first lens group G1 and the second lens group G2 is enlarged, and the air between the second lens group G2 and the third lens group G3 is By changing the lens groups G1 to G3 along the optical axis so as to reduce the distance, the magnification change from the wide-angle end state to the telephoto end state is performed.

第３実施例に係る変倍光学系ＺＬ３は、第３Ａレンズ群Ｇ３Ａ、すなわち両凸レンズＬ３１を光軸方向に沿って移動させることにより合焦を行う構成であり、図９の矢印に示すように、無限遠物体に合焦した状態から近距離物体へ合焦する状態に変化させたときに、両凸レンズＬ３１は物体側から像側へ移動する。 The variable magnification optical system ZL3 according to the third example is configured to perform focusing by moving the third lens group G3A, that is, the biconvex lens L31 along the optical axis direction, as shown by the arrows in FIG. When changing from focusing on an object at infinity to focusing on a near object, the biconvex lens L31 moves from the object side to the image side.

下記の表３に、第３実施例における各諸元の値を示す。表３における面番号１〜２２が、図９に示すｍ１〜ｍ２２の各光学面に対応している。 Table 3 below shows values of respective items in the third embodiment. The surface numbers 1 to 22 in Table 3 correspond to the optical surfaces m1 to m22 shown in FIG.

（表３）
［レンズデータ］
面番号ｒＤ νｄｎｄ
1 54.753 1.500 23.80 1.846660
2 38.695 5.554 67.90 1.593190
3 -34295.201 D3(可変)
*4 78.694 0.160 38.09 1.553890
5 98.152 1.200 42.73 1.834810
6 10.847 3.606
7 -970.417 1.000 42.73 1.834810
8 23.052 1.059
9 17.651 2.718 25.45 1.805180
10 124.240 D10(可変)
11 756.198 1.530 44.80 1.744000
12 -42.339 D12(可変)
13 ∞ 2.000 (絞りＳ)
14 10.744 4.744 82.57 1.497820
15 -14.187 0.800 32.35 1.850260
16 -36.052 2.298
*17 61.167 0.800 49.26 1.743200
18 25.724 3.680
19 40.116 2.998 36.40 1.620040
20 -27.927 2.317
*21 -8.706 1.000 31.27 1.903660
22 -17.386 Bf

［非球面データ］
第4面
κ ＝ 1.0000
A4 ＝ -8.92993E-06
A6 ＝ -3.84277E-08
A8 ＝ 5.03368E-10
A10＝ -1.64069E-12

第17面
κ ＝ 1.0000
A4 ＝ 4.87068E-06
A6 ＝ -6.89267E-08
A8 ＝ 0.00000E+00
A10＝ 0.00000E+00

第21面
κ ＝ 1.0000
A4 ＝ -3.24561E-05
A6 ＝ -9.10280E-07
A8 ＝ 2.25192E-08
A10＝ -6.24358E-10

［各種データ］
ｆ 18.477 34.000 53.500
Ｆｎｏ 3.630 4.663 5.630
ω 39.444 21.946 14.295
Ｙ 14.250 14.250 14.250
ＴＬ 74.395 88.467 104.339
Ｂｆ 17.318 26.476 34.918

［可変間隔データ］
（無限遠）（撮影距離１ｍ）
広角端中間望遠端広角端中間望遠端
f,β 18.477 34.000 53.500 -0.0194 -0.0355 -0.0552
D0 0.000 0.000 0.000 925.6 911.5 895.7
D3 1.000 14.075 25.532 1.000 14.075 25.532
D10 13.187 5.026 1.000 13.679 5.760 2.066
D12 3.919 3.919 3.919 3.428 3.185 2.852

［レンズ群データ］
群番号群初面群焦点距離
Ｇ１ 1 110.968
Ｇ２ 4 -16.768
Ｇ３ 11 18.415

［条件式対応値］
条件式（１）：（−ｆ２）／ｆ３＝ 0.91
条件式（２）：ｆ３Ａ／ｆ３＝ 2.93
条件式（３）：｜ｆ３Ｂ｜／ｆ３＝ 1.63
条件式（４）：｜ｆｖｒ｜／ｆ３＝ 3.28
条件式（５）：ωｗ＝ 39.444
条件式（６）：ｆｔ／ｆｗ＝ 2.90 (Table 3)
[Lens data]
Face number r D ν d nd
1 54.753 1.500 23.80 1.846660
2 38.695 5.554 67.90 1.593190
3-34295.201 D3 (variable)
* 4 78.694 0.160 38.09 1.553890
5 98.152 1.200 42.73 1.834810
6 10.847 3.606
7-970.417 1.000 42.73 1.834810
8 23.052 1.059
9 17.651 2.718 25.45 1.805180
10 124.240 D10 (variable)
11 756.198 1.530 44.80 1.744000
12-42.339 D12 (variable)
13 ∞ 2.000 (aperture S)
14 10.744 4.744 82.57 1.497820
15-14.187 0.800 32.35 1.850260
16-36.052 2.298
* 17 61.167 0.800 49.26 1.743200
18 25.724 3.680
19 40.116 2.98 36.40 1.620040
20-27.927 2.317
* 21-8.706 1.000 31.27 1.903660
22 -17.386 Bf

[Aspheric surface data]
Fourth plane κ = 1.0000
A4 = -8.92993E-06
A6 = -3.84277E-08
A8 = 5.03368E-10
A10 = -1.64069E-12

17th plane κ = 1.0000
A4 = 4.87068E-06
A6 = -6.89267E-08
A8 = 0.00000 E + 00
A10 = 0.00000 E + 00

Plane 21 == 1.0000
A4 =-3.24561E-05
A6 = -9.10280E-07
A8 = 2.25192 E-08
A10 = -6.24358E-10

[Various data]
f 18.477 34.000 53.500
Fno 3.630 4.663 5.630
ω 39.444 21.946 14.295
Y 14.250 14.250 14.250
TL 74.395 88.467 104.339
Bf 17.318 26.476 34.918

[Variable interval data]
(Infinity) (shooting distance 1 m)
Wide-angle end Middle Telephoto end Wide-angle end Mid Telephoto end
f, β 18.477 34.0000 53.500-0.0194 -0.0355-0.0552
D0 0.000 0.000 0.000 925.6 911.5 895.7
D3 1.000 14.075 25.532 1.000 14.075 25.532
D10 13.187 5.026 1.000 13.679 5.760 2.066
D12 3.919 3.919 3.919 3.428 3.185 2.852

[Lens group data]
Group number Group initial surface Group focal length G1 1 110.968
G2 4 -16.768
G3 11 18.415

[Conditional expression corresponding value]
Conditional Expression (1): (−f 2) / f 3 = 0.91
Conditional Expression (2): f3A / f3 = 2.93
Conditional Expression (3): | f3B | / f3 = 1.63
Conditional Expression (4): | fvr | / f3 = 3.28
Conditional Expression (5): ω w = 39.444
Conditional Expression (6): ft / fw = 2.90

表３から、第３実施例に係る変倍光学系ＺＬ３は、上記条件式（１）〜（６）を満たすことが分かる。 From Table 3, it can be seen that the variable magnification optical system ZL3 according to the third example satisfies the conditional expressions (1) to (6).

図１０は、第３実施例に係る変倍光学系ＺＬ３の広角端状態（ｆ＝18.477）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0194）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。図１１は、第３実施例に係る変倍光学系ＺＬ３の中間焦点距離状態（ｆ＝34.000）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0355）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。図１２は、第３実施例に係る変倍光学系ＺＬ３の望遠端状態（ｆ＝53.500）における収差図であり、（ａ）無限遠合焦時の諸収差図、（ｂ）は近距離合焦時（撮影倍率β＝-0.0552）の諸収差図、（ｃ）は無限遠合焦時に像ブレ補正を行った時（補正角度θ＝0.30°）のコマ収差図を示す。本実施例では、防振時の光学性能を、図１０（ｃ）、図１１（ｃ）及び図１２（ｃ）のように、像高ｙ＝0.0を中心に、上下プラスマイナスの像高10.0に対応したコマ収差図で示す。 FIG. 10 is an aberration drawing of the zoom optical system ZL3 of the third example at the wide-angle end (f = 18.477), (a) various aberrations at the time of infinity focusing, and FIG. (C) shows a coma aberration diagram at the time of image blur correction (correction angle θ = 0.30 °) at infinity focusing (focusing magnification β = −0.0194). FIG. 11 is an aberration drawing of the zoom optical system ZL3 of the third example at an intermediate focal length state (f = 34.000), (a) various types of aberration upon focusing at infinity, (b) at a short distance (C) shows a coma aberration diagram at the time of image blur correction (correction angle θ = 0.30 °) at infinity focusing (focusing magnification β = −0.0355). FIG. 12 is an aberration drawing of the zoom optical system ZL3 of the third example at the telephoto end (f = 53.500), and (a) various aberrations at the time of infinity focusing, (C) shows a coma aberration diagram at the time of image blur correction (correction angle θ = 0.30 °) at infinity focusing (focusing magnification β = −0.0552). In this embodiment, as shown in FIGS. 10 (c), 11 (c) and 12 (c), the optical performance at the time of image stabilization is an image height 10.0 of up and down plus and minus centering on the image height y = 0.0 It shows in the coma aberration figure corresponding to.

図１０〜図１２に示す各収差図から、第３実施例に係る変倍光学系ＺＬ３は、広角端状態から望遠端状態にわたり諸収差が良好に補正され、高い結像性能を有することが分かる。また、像ブレ補正時にも高い結像性能を有することが分かる。 From the respective aberration diagrams shown in FIG. 10 to FIG. 12, it is understood that the variable magnification optical system ZL3 according to the third example has various imaging characteristics well corrected from the wide-angle end state to the telephoto end state and has high imaging performance. . In addition, it can be seen that high imaging performance is obtained also at the time of image shake correction.

以上の各実施例によれば、高い光学性能を有する変倍光学系が実現できる。 According to each of the above embodiments, a variable power optical system having high optical performance can be realized.

なお、上記の各実施例は、本実施形態に係る変倍光学系の一具体例を示しているものであり、本実施形態に係る変倍光学系はこれらに限定されるものではない。本実施形態において、下記の内容は光学性能を損なわない範囲で適宜採用可能である。 Each of the above-described examples shows one specific example of the variable magnification optical system according to the present embodiment, and the variable magnification optical system according to the present embodiment is not limited to these. In the present embodiment, the following contents can be appropriately adopted within the range in which the optical performance is not impaired.

本実施形態の数値実施例では、３群構成を示したが、４群等の他の群構成にも適用可能である。例えば、最も物体側にレンズまたはレンズ群を追加した構成や、最も像側にレンズまたはレンズ群を追加した構成でも構わない。また、レンズ群とは、変倍時又は合焦時に変化する空気間隔で分離された、少なくとも１枚のレンズを有する部分を示す。 Although the three-group configuration is shown in the numerical example of the present embodiment, the present invention is also applicable to other group configurations such as four-group. For example, a lens or lens group may be added to the most object side, or a lens or lens group may be added to the most image side. In addition, the lens group indicates a portion having at least one lens separated by an air gap that changes at the time of zooming or focusing.

本実施形態において、単独または複数のレンズ群、または部分レンズ群を光軸方向に移動させて、無限遠物体から近距離物体への合焦を行う合焦レンズ群としてもよい。この合焦レンズ群は、オートフォーカスにも適用でき、オートフォーカス用の（超音波モーター等を用いた）モーター駆動にも適している。特に、第３レンズ群Ｇ３の少なくとも一部を合焦レンズ群とするのが好ましい。 In this embodiment, a single or a plurality of lens groups or a partial lens group may be moved in the optical axis direction to provide a focusing lens group for focusing from an infinite distance object to a near distance object. This focusing lens group can also be applied to auto focusing, and is also suitable for motor driving (using an ultrasonic motor or the like) for auto focusing. In particular, it is preferable to set at least a part of the third lens group G3 as a focusing lens group.

本実施形態において、レンズ群または部分レンズ群を光軸に垂直な方向の成分を持つように移動させ、または、光軸を含む面内方向に回転移動（揺動）させて、手ブレによって生じる像ブレを補正する防振レンズ群としてもよい。特に、第３レンズ群Ｇ３の少なくとも一部を防振レンズ群とするのが好ましい。 In the present embodiment, the lens group or the partial lens group is moved so as to have a component in the direction perpendicular to the optical axis, or is rotated in an in-plane direction including the optical axis It may be a vibration reduction lens group that corrects image blur. In particular, at least a part of the third lens group G3 is preferably used as a vibration reduction lens group.

本実施形態において、レンズ面は、球面または平面で形成されても、非球面で形成されても構わない。レンズ面が球面または平面の場合、レンズ加工及び組立調整が容易になり、加工及び組立調整の誤差による光学性能の劣化を防げるので好ましい。また、レンズ面が非球面の場合、非球面は、研削加工による非球面、ガラスを型で非球面形状に形成したガラスモールド非球面、ガラスの表面に樹脂を非球面形状に形成した複合型非球面のいずれの非球面でも構わない。また、レンズ面は回折面としてもよく、レンズを屈折率分布型レンズ（ＧＲＩＮレンズ）あるいはプラスチックレンズとしてもよい。 In the present embodiment, the lens surface may be formed as a spherical surface, a flat surface or an aspherical surface. When the lens surface is spherical or flat, it is preferable because lens processing and assembly adjustment become easy, and degradation of optical performance due to processing and assembly adjustment errors can be prevented. When the lens surface is aspheric, the aspheric surface is an aspheric surface formed by grinding, a glass mold aspheric surface formed of glass by a mold, and a composite aspheric surface formed of resin on the surface of glass. It may be any spherical surface. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.

本実施形態において、開口絞りＳは、第３レンズ群Ｇ３の中又は近傍に配置されるのが好ましいが、開口絞りとしての部材を設けずにレンズ枠でその役割を代用してもよい。 In the present embodiment, the aperture stop S is preferably disposed in or near the third lens group G3, but the lens frame may substitute for the role without providing a member as an aperture stop.

本実施形態において、各レンズ面には、フレアやゴーストを軽減して高コントラストの高い光学性能を達成するために、広い波長域で高い透過率を有する反射防止膜を施してもよい。 In the present embodiment, each lens surface may be provided with an anti-reflection film having high transmittance over a wide wavelength range in order to reduce flare and ghost and achieve high optical performance with high contrast.

本実施形態の変倍光学系ＺＬは、変倍比が２〜７程度である。 The variable magnification optical system ZL of this embodiment has a variable magnification ratio of about 2 to 7.

ＺＬ（ＺＬ１〜ＺＬ３）変倍光学系
Ｇ１第１レンズ群
Ｇ２第２レンズ群
Ｇ３第３レンズ群
Ｓ開口絞り
Ｉ像面
１カメラ（撮像装置）
２撮影レンズ（変倍光学系） ZL (ZL1 to ZL3) Variable magnification optical system G1 First lens group G2 Second lens group G3 Third lens group S Aperture stop I Image plane 1 Camera (imaging device)
2 Shooting lens (variable magnification optical system)

Claims

Substantially three lenses of a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power, arranged in order from the object side Consists of groups,
The first lens group consists of one negative lens and one positive lens.
The third lens group includes, in order from the object side, a third lens group A having a positive refractive power and a third lens group B.
During zooming from the wide-angle end state to the telephoto end state, the first lens group moves in the object direction along the optical axis direction, and the distance between adjacent lens groups changes.
Focusing is performed by moving the third lens group A along the optical axis direction,
At least a part of the third lens group B is configured to be movable as a vibration reduction lens group for correcting image blur so as to have a component in a direction perpendicular to the optical axis,
A variable magnification optical system characterized by satisfying the following conditional expression.
0.73 <(-f2) / f3 <2.00
2.00 <| fvr | / f3 <6.00
However,
f2: focal length of the second lens group,
f3: focal length of the third lens group,
fvr: focal length of the anti-vibration lens group.

The variable magnification optical system according to claim 1, wherein the vibration reduction lens group is composed of a single lens.

Substantially three lenses of a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power, arranged in order from the object side Consists of groups,
The first lens group consists of one negative lens and one positive lens.
The third lens group includes, in order from the object side, a third lens group A having a positive refractive power and a third lens group B.
During zooming from the wide-angle end state to the telephoto end state, the first lens group moves in the object direction along the optical axis direction, and the distance between adjacent lens groups changes.
Focusing is performed by moving the third lens group A along the optical axis direction,
At least a part of the third lens group B is configured to be movable as a vibration reduction lens group for correcting image blur so as to have a component in a direction perpendicular to the optical axis,
The anti-vibration lens group consists of a single lens,
A variable magnification optical system characterized by satisfying the following conditional expression.
0.73 <(-f2) / f3 <2.00
However,
f2: focal length of the second lens group,
f3: focal length of the third lens unit.

The variable magnification optical system according to any one of claims 1 to 3 , which satisfies the following conditional expression.
1.00 <f3A / f3 <4.00
However,
f3A: focal length of the third A lens group.

The variable magnification optical system according to any one of claims 1 to 4 , wherein the third lens group A consists of a single lens.

The variable magnification optical system according to any one of claims 1 to 5 , wherein the following conditional expression is satisfied.
1.00 <| f3B | / f3 <5.00
However,
f3B: focal length of the third B lens group.

The variable magnification optical system according to any one of claims 1 to 6 , wherein the vibration reduction lens group has a negative refractive power.

Have a stop,
The variable magnification optical system according to any one of claims 1 to 7 , wherein the stop moves along the optical axis direction integrally with the third lens group at the time of zooming.

Have a stop,
The variable magnification optical system according to any one of claims 1 to 8 , wherein the stop is disposed between the second lens group and an image plane.

The variable magnification optical system according to any one of claims 1 to 9 , wherein the following conditional expression is satisfied.
30.00 ° <ωw <80.00 °
However,
ωw: Half angle of view in the wide-angle end state.

The variable magnification optical system according to any one of claims 1 to 10 , which satisfies the following conditional expression.
2.00 <ft / fw <15.00
However,
ft: focal length of the entire system at the telephoto end,
fw: focal length of the entire system at the wide-angle end.

An imaging apparatus comprising the variable magnification optical system according to any one of claims 1 to 11 .