JP3003370B2 - Variable power optical system with anti-vibration function - Google Patents
Variable power optical system with anti-vibration functionInfo
- Publication number
- JP3003370B2 JP3003370B2 JP4069447A JP6944792A JP3003370B2 JP 3003370 B2 JP3003370 B2 JP 3003370B2 JP 4069447 A JP4069447 A JP 4069447A JP 6944792 A JP6944792 A JP 6944792A JP 3003370 B2 JP3003370 B2 JP 3003370B2
- Authority
- JP
- Japan
- Prior art keywords
- group
- lens
- refractive power
- lens unit
- optical axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は振動による撮影画像のブ
レを補正する機能、所謂防振機能を有した変倍光学系に
関し、特に防振用の可動レンズ群を例えば光軸と直交す
る方向に移動させて、又は光軸と直交する方向に移動さ
せると共に光軸上の一点を回転中心として回動させて防
振効果を発揮させたときの光学性能の低下の防止を図っ
た防振機能を有した変倍光学系に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable magnification optical system having a function of correcting a blur of a photographed image due to vibration, that is, a so-called anti-shake function. Or in the direction perpendicular to the optical axis, and at the same time, rotating about one point on the optical axis as the center of rotation to prevent the optical performance from deteriorating. This relates to a variable power optical system having
【０００２】[0002]
【従来の技術】進行中の車や航空機等移動物体上から撮
影をしようとすると撮影系に振動が伝わり撮影画像にブ
レが生じる。2. Description of the Related Art When an image is taken from a moving object such as a car or an aircraft in progress, vibration is transmitted to a photographing system, and the photographed image is blurred.
【０００３】従来より撮影画像のブレを防止する機能を
有した防振光学系が、例えば特開昭５０−８０１４７号
公報や特公昭５６−２１１３３号公報、特開昭６１−２
２３８１９号公報等で提案されている。Conventionally, a vibration-proof optical system having a function of preventing blurring of a photographed image is disclosed in, for example, Japanese Patent Application Laid-Open No. 50-80147, Japanese Patent Publication No. 56-21133, and Japanese Patent Application Laid-Open No. 61-2.
No. 23819 and the like.
【０００４】特開昭５０−８０１４７号公報では２つの
アフォーカルの変倍系を有するズームレンズにおいて第
１の変倍系の角倍率をＭ1 、第２の変倍系の角倍率をＭ
2 としたときＭ1 ＝１−１／Ｍ2 なる関係を有するよう
に各変倍系で変倍を行うと共に、第２の変倍系を空間的
に固定して画像のブレを補正して画像の安定化を図って
いる。In Japanese Patent Laid-Open Publication No. 50-80147, in a zoom lens having two afocal magnification systems, the first magnification system has an angular magnification of M 1 , and the second magnification system has an angular magnification of M 1.
Performs zooming by each magnification system to have a M 1 = 1-1 / M 2 the relationship when a 2, the second magnification system to correct the blur of the spatially fixed to the image The image is stabilized.
【０００５】特公昭５６−２１１３３号公報では光学装
置の振動状態を検知する検知手段からの出力信号に応じ
て、一部の光学部材を振動による画像の振動的変位を相
殺する方向に移動させることにより画像の安定化を図っ
ている。Japanese Patent Publication No. 56-21133 discloses that some optical members are moved in a direction to cancel the vibrational displacement of the image due to the vibration in accordance with the output signal from the detecting means for detecting the vibration state of the optical device. To stabilize the image.
【０００６】特開昭６１−２２３８１９号公報では最も
被写体側に屈折型可変頂角プリズムを配置した撮影系に
おいて、撮影系の振動に対応させて該屈折型可変頂角プ
リズムの頂角を変化させて画像を偏向させて画像の安定
化を図っている。In Japanese Patent Application Laid-Open No. 61-223819, in a photographing system in which a refraction type variable apex angle prism is arranged closest to the subject, the apex angle of the refraction type variable apex angle prism is changed according to the vibration of the imaging system. The image is deflected to stabilize the image.
【０００７】この他、特公昭５６−３４８４７号公報、
特公昭５７−７４１４号公報等では撮影系の一部に振動
に対して空間的に固定の光学部材を配置し、この光学部
材の振動に対して生ずるプリズム作用を利用することに
より撮影画像を偏向させ結像面上で静止画像を得てい
る。In addition, Japanese Patent Publication No. 56-34847,
In Japanese Patent Publication No. 57-7414, an optical member which is spatially fixed to vibration is disposed in a part of a photographing system, and a photographed image is deflected by utilizing a prism effect generated by vibration of the optical member. As a result, a still image is obtained on the image plane.
【０００８】又、加速度センサーを利用して撮影系の振
動を検出し、このとき得られる信号に応じ、撮影系の一
部のレンズ群を光軸と直交する方向に振動させることに
より静止画像を得る方法も行なわれている。Further, a vibration of the photographing system is detected by using an acceleration sensor, and a still image is formed by vibrating a part of the lens group of the photographing system in a direction orthogonal to the optical axis in accordance with a signal obtained at this time. There are also ways to get it.
【０００９】[0009]
【発明が解決しようとする課題】一般に撮影系の一部の
レンズ群を振動させて撮影画像のブレをなくし、静止画
像を得る機構には画像のブレの補正量が大きいことやブ
レ補正の為に振動させるレンズ群（可動レンズ群）の移
動量や回転量が少ないこと等が要望されている。In general, a mechanism for obtaining a still image by eliminating vibrations of a photographed image by vibrating a part of a lens group of a photographing system has a large amount of image blur correction and a mechanism for correcting the vibration. There is a demand for a small amount of movement or rotation of a lens group (movable lens group) to be vibrated in a short time.
【００１０】又、可動レンズ群を偏心させたとき偏心コ
マ、偏心非点収差、偏心色収差、そして偏心像面湾曲収
差等が多く発生すると画像のブレを補正したとき偏心収
差の為、画像がボケてくる。例えば偏心歪曲収差が多く
発生すると光軸上の画像の移動量と周辺部の画像の移動
量が異なってくる。この為、光軸上の画像を対象に画像
のブレを補正しようと可動レンズ群を偏心させると、周
辺部では画像のブレと同様な現象が発生してきて光学特
性を著しく低下させる原因となってくる。When the movable lens group is decentered, a large amount of eccentric coma, eccentric astigmatism, eccentric chromatic aberration, and eccentric curvature of field occur. If the blurring of the image is corrected, the image is blurred. Come. For example, when a large amount of eccentric distortion occurs, the amount of movement of the image on the optical axis and the amount of movement of the peripheral image differ. For this reason, if the movable lens group is decentered in order to correct the image blur on the image on the optical axis, a phenomenon similar to the image blur occurs in the peripheral portion, causing a significant decrease in optical characteristics. come.
【００１１】このように防振機能を有した変倍光学系に
おいては可動レンズ群を光軸と直交する方向に移動さ
せ、又はそれと共に光軸上の一点を回転中心として微少
回転させて偏心状態にしたとき偏心収差発生量が少なく
光学性能の低下の少ないこと、可動レンズ群の少ない移
動量又は少ない回転量で大きな画像のブレを補正するこ
とができる、所謂偏心敏感度（単位移動量ΔＨに対する
画像のブレの補正量Δｘとの比Δｘ／ΔＨ）が大きいこ
と等が要求されている。In such a variable power optical system having a vibration proof function, the movable lens group is moved in a direction orthogonal to the optical axis, or at the same time, is slightly rotated about one point on the optical axis as a center of rotation, so that the eccentric state is obtained. In this case, a small amount of eccentric aberration is generated, the deterioration of optical performance is small, and a large image blur can be corrected with a small moving amount or a small rotating amount of the movable lens group. It is required that the ratio (Δx / ΔH) of the image blur correction amount Δx is large.
【００１２】しかしながら、以上の諸条件を全て満足さ
せた変倍光学系を得るのは一般に大変困難で、特に変倍
光学系の一部の屈折力を有したレンズ群を偏心させると
光学性能が大きく低下し、良好なる画像が得られない欠
点があった。However, it is generally very difficult to obtain a variable power optical system that satisfies all of the above conditions. In particular, if the lens group having a part of the variable power optical system is decentered, the optical performance becomes poor. There is a disadvantage that the image is greatly reduced and a good image cannot be obtained.
【００１３】本発明は変倍光学系の一部のレンズ群を光
軸と直交する方向に移動させて又はそれと共に光軸上の
一点を回転中心として微少回転させて画像のブレを補正
する際、可動レンズ群として小型軽量のレンズ群を用
い、かつ少ない移動量又は回転量で大きな画像のブレを
補正することができ、更に可動レンズ群を移動させて平
行偏心又は／及び回転偏心させたときの前述の各種の偏
心収差の発生量が少なく良好なる光学性能が得られる防
振機能を有した変倍光学系の提供を目的とする。According to the present invention, when a part of the lens unit of the variable power optical system is moved in a direction orthogonal to the optical axis or at the same time, it is slightly rotated about one point on the optical axis as a rotation center to correct image blur. When a small and lightweight lens group is used as the movable lens group, a large image blur can be corrected with a small amount of movement or rotation, and the movable lens group is further moved to perform parallel eccentricity and / or rotational eccentricity. It is an object of the present invention to provide a variable power optical system having an image stabilizing function capable of obtaining good optical performance with a small amount of generation of the various decentering aberrations.
【００１４】[0014]
【課題を解決する為の手段】本発明の防振機能を有した
変倍光学系は、（イ）物体側より順に正の屈折力の第１
群、負の屈折力の第２群、正の屈折力の第３群そして正
の屈折力の第４群の４つのレンズ群を有し、広角端から
望遠端への変倍を該第１群と第２群との間隔を増加させ
て行い、かつ変倍に伴う像面変動を該第３群を光軸上移
動させて補正し、該第２群を光軸と垂直方向に移動させ
て撮影画像のブレを補正すると共に、該第１群の屈折力
をφ１、望遠端における全系の屈折力をφＴ、望遠端に
おける該第１群と第２群の合成屈折力をφＴ１，２、望
遠端における全系の屈折力を正規化したときの該第３群
のペッツバール和と第４群のペッツバール和との合計を
Ｐ３，４としたとき ２．０＜φ１／φＴ＜２．５ ‥‥‥（１） −２．０＜φＴ１，２／φＴ＜−１．０ ‥‥‥（２） ２．０＜Ｐ３，４＜５．０ ‥‥‥（３） なる条件を満足すること。According to the present invention, a variable power optical system having an image stabilizing function includes: (a) a first optical system having a positive refractive power in order from the object side;
The zoom lens includes four lens groups, a second group having a negative refractive power, a third group having a positive refractive power, and a fourth group having a positive refractive power. The distance between the second unit and the second unit is increased, and the image plane fluctuation caused by zooming is corrected by moving the third unit on the optical axis, and the second unit is moved in a direction perpendicular to the optical axis. And the refractive power of the first group is φ1, the refractive power of the entire system at the telephoto end is φT, and the combined refractive power of the first and second groups at the telephoto end is φT1, φT1, When the sum of the Petzval sum of the third group and the Petzval sum of the fourth group when the refractive power of the entire system at the telephoto end is normalized is P3,4, 2.0 <φ1 / φT <2.5 {(1) −2.0 <φT1, 2 / φT <−1.0} (2) 2.0 <P3, 4 <5.0 ‥‥‥ (3) .
【００１５】特に、物体側より順に前記第１群は物体側
に凸面を向けたメニスカス状の負の第１１レンズと物体
側に凸面を向けたメニスカス状の正の第１２レンズとを
貼り合わせた接合レンズそして正の第１３レンズの３つ
のレンズより成り、該第１群の第ｉ番目のレンズ面の曲
率半径をＲ１，ｉ、該第１群の焦点距離をＦ１としたと
き ０．６＜Ｒ１，１／Ｆ１＜１．２ ３．０＜Ｒ１，３／Ｆ１ なる条件を満足すること。In particular, in order from the object side, the first group is composed of a meniscus negative eleventh lens having a convex surface facing the object side and a meniscus positive twelfth lens having a convex surface facing the object side. When the radius of curvature of the i-th lens surface of the first group is R1, i, and the focal length of the first group is F1, 0.6 << R1,1 / F1 <1.2 3.0 <R1,3 / F1
【００１６】[0016]
【００１７】（ロ）物体側より順に正の屈折力の第１
群、負の屈折力の第２群、正の屈折力の第３群そして正
の屈折力の第４群の４つのレンズ群を有し、広角端から
望遠端への変倍を該第１群と第２群との間隔を増加させ
て行い、かつ変倍に伴う像面変動を該第３群を光軸上移
動させて補正し、該第２群を光軸と垂直方向に移動させ
ると共に該第２群の内部又は近傍の光軸上の一点を回転
中心として微小回転させることにより撮影画像のブレを
補正しており、該第１群の屈折力をφ１、望遠端におけ
る全系の屈折力をφＴ、望遠端における該第１群と該第
２群の合成屈折力をφＴ１，２、望遠端における全系の
屈折力を１に正規化したときの該第３群のペッツバール
和と該第４群のペッツバール和との合計をＰ３，４とし
たとき ２．０＜φ１／φＴ＜２．５ ‥‥‥（１） −２．０＜φＴ１，２／φＴ＜−１．０ ‥‥‥（２） ２．０＜Ｐ３，４＜５．０ ‥‥‥（３） なる条件を満足することである。(B) The first positive refractive power in order from the object side
The zoom lens includes four lens groups, a second group having a negative refractive power, a third group having a positive refractive power, and a fourth group having a positive refractive power. The distance between the second unit and the second unit is increased, and the image plane fluctuation caused by zooming is corrected by moving the third unit on the optical axis, and the second unit is moved in a direction perpendicular to the optical axis. At the same time, the blurring of the photographed image is corrected by making a small rotation about a point on the optical axis inside or near the second unit as a center of rotation. The refractive power of the first unit is φ1, and the entire system at the telephoto end is When the refractive power is φT, the combined refractive power of the first lens unit and the second lens unit at the telephoto end is φT1,2, and the Petzval sum of the third lens unit when the refractive power of the entire system at the telephoto end is normalized to 1. Assuming that the sum of the fourth group and the Petzval sum is P3,4, 2.0 <φ1 / φT <2.5 ‥‥‥ (1) −2.0 <φT1,2 / φ <-1.0 ‥‥‥ (2) 2.0 <is to satisfy P3,4 <5.0 ‥‥‥ (3) becomes a condition.
【００１８】[0018]
【００１９】[0019]
【実施例】図１、図２は各々本発明に係る変倍光学系の
後述する数値実施例１，２のレンズ断面図である。1 and 2 are lens sectional views of numerical examples 1 and 2 of a variable power optical system according to the present invention, which will be described later.
【００２０】図中Ｌ１は正の屈折力の第１群、Ｌ２は負
の屈折力の第２群である。広角端から望遠端への変倍に
際しては、第１群を物体側へ移動させると共に第２群を
像面側へ移動させている。又撮影画像のブレを補正する
為、第２群を光軸と直交方向に移動又はそれと共に光軸
上の一点を回転中心にして微少回転させている。Ｌ３は
正の屈折力の第３群であり、変倍に伴う像面変動を補正
する為に光軸上移動させている。ＳＰは絞りである。Ｌ
４は正の屈折力の第４群であり、変倍の際には固定とな
っている。フォーカスは図１の実施例１では第１群を光
軸上移動させ、図２の実施例２では第３群を光軸上移動
させて行っている。In the figure, L1 is a first group having a positive refractive power, and L2 is a second group having a negative refractive power. In zooming from the wide-angle end to the telephoto end, the first unit is moved to the object side and the second unit is moved to the image plane side. In order to correct the blur of the photographed image, the second lens unit is moved in the direction orthogonal to the optical axis or is slightly rotated around one point on the optical axis. L3 is a third lens unit having a positive refractive power, which is moved on the optical axis in order to correct an image plane variation accompanying zooming. SP is an aperture. L
Reference numeral 4 denotes a fourth unit having a positive refractive power, which is fixed during zooming. Focusing is performed by moving the first lens unit on the optical axis in the first embodiment of FIG. 1 and moving the third lens unit on the optical axis in the second embodiment of FIG.
【００２１】本実施例では振動や手ブレ等によって変倍
光学系が傾いて、撮影画像にブレが生じたときは不図示
の公知のブレ検出手段等によりこのときのブレを検出し
ている。そして該ブレ検出手段からの出力信号に応じて
不図示の駆動手段により第２群を光軸と直交する方向に
移動又は光軸と直交する方向に移動させると共に第２群
の光軸上の一点を回転中心として微少回転させている。
これにより偏心収差の発生を少なくしつつ撮影画像のブ
レを補正している。In this embodiment, when the variable power optical system is tilted due to vibration, camera shake, or the like, and the captured image is blurred, the blur at this time is detected by a known blur detecting means (not shown). The second unit is moved in a direction orthogonal to the optical axis or in a direction orthogonal to the optical axis by a driving unit (not shown) according to an output signal from the shake detecting unit, and a point on the optical axis of the second group is moved. Is slightly rotated around the center of rotation.
As a result, the blur of the captured image is corrected while the occurrence of eccentric aberration is reduced.
【００２２】図３、図４、図５は各々本発明の数値実施
例１の広角端、中間、望遠端での撮影倍率が約５０倍の
ときの収差図である。収差図においてｈは像高を示して
いる。FIGS. 3, 4, and 5 are aberration diagrams of the numerical example 1 of the present invention at the wide-angle end, the middle position, and the telephoto end, respectively, when the photographing magnification is about 50 times. In the aberration diagrams, h indicates the image height.
【００２３】図中（Ａ）は偏心のない通常状態のときを
示している。（Ｂ）は振動が１度あったとき振動補償を
する為に第２群を光軸と直交する方向に平行偏心させた
ときを示している。（Ｃ）は振動が１度あったとき振動
補償をする為に第２群を光軸と直交する方向に平行偏心
させると共に第２群の最も物体側のレンズ面と光軸との
交点を回転中心として元の光軸と平行偏心させた後の第
２群の光軸を含む平面内で微少角度θ度だけ回転させた
ときを示している。FIG. 3A shows a normal state without eccentricity. (B) shows a case where the second lens unit is decentered in parallel in a direction perpendicular to the optical axis in order to compensate for the vibration when the vibration is once. (C) shows that the second lens unit is decentered parallel to the direction perpendicular to the optical axis to compensate for the vibration when the vibration is once, and the intersection of the lens surface of the second lens unit closest to the object and the optical axis is rotated. The figure shows a case where the lens is rotated by a minute angle θ degrees in a plane including the optical axis of the second group after being decentered parallel to the original optical axis as a center.
【００２４】ここでθは図３（Ｃ）の広角端のズーム位
置のときはθ＝０．１５度、図４（Ｃ）の中間のズーム
位置のときはθ＝０．２度であり、図５の望遠端のとき
は平行偏心のみで十分に偏心収差が小さいので回転偏心
は行っていないθ＝０度のときを示している。Here, θ is 0.15 degrees at the zoom position at the wide-angle end in FIG. 3C, and θ is 0.2 degrees at the intermediate zoom position in FIG. At the telephoto end in FIG. 5, only the parallel eccentricity has a sufficiently small eccentric aberration, so that the rotation eccentricity is not performed and θ = 0 degrees.
【００２５】本実施例では撮影画像のブレは第２群を平
行偏心させるだけで偏心収差の発生量が少なく良好に補
正することができるので十分であるが更に第２群を回転
偏心させれば、より偏心収差の発生を少なくすることが
でき良好なる光学性能を維持することができる。In this embodiment, the blurring of the photographed image is sufficient because the amount of eccentric aberration is small and can be corrected satisfactorily by simply decentering the second unit in parallel. Thus, the occurrence of eccentric aberration can be further reduced, and good optical performance can be maintained.
【００２６】図６、図７、図８は本発明の数値実施例２
の広角端、中間、望遠端での撮影倍率が約５０倍のとき
の収差図である。収差図においてｈは像高を示してい
る。FIGS. 6, 7 and 8 show a second embodiment of the present invention.
4 is an aberration diagram when the imaging magnification at the wide-angle end, middle, and telephoto end is about 50 times. In the aberration diagrams, h indicates the image height.
【００２７】図中（Ａ）は偏心のない通常状態のときを
示している。（Ｂ）は振動が１度あったとき振動補償を
する為に第２群を光軸と直交する方向に平行偏心させた
ときを示している。（Ｃ）は振動が１度あったとき振動
補償をする為に第２群を光軸と直交する方向に平行偏心
させると共に第２群の最も物体側のレンズ面と光軸との
交点を回転中心として元の光軸と平行偏心させた後の第
２群の光軸を含む平面内で微少角度θ度だけ回転させた
ときを示している。FIG. 3A shows a normal state without eccentricity. (B) shows a case where the second lens unit is decentered in parallel in a direction perpendicular to the optical axis in order to compensate for the vibration when the vibration is once. (C) shows that the second lens unit is decentered parallel to the direction perpendicular to the optical axis to compensate for the vibration when the vibration is once, and the intersection of the lens surface of the second lens unit closest to the object and the optical axis is rotated. The figure shows a case where the lens is rotated by a minute angle θ degrees in a plane including the optical axis of the second group after being decentered parallel to the original optical axis as a center.
【００２８】ここでθは図６（Ｃ）の広角端のズーム位
置のときはθ＝０．１度、図７（Ｃ）の中間のズーム位
置のときはθ＝０．２５度であり、図８の望遠端のとき
は平行偏心のみで十分に偏心収差が小さいので回転偏心
は行っていないθ＝０度のときを示している。Here, θ is 0.1 ° at the zoom position at the wide-angle end in FIG. 6C, and θ = 0.25 ° at the intermediate zoom position in FIG. 7C. At the telephoto end in FIG. 8, only the parallel eccentricity has a sufficiently small eccentric aberration, so that the rotation eccentricity is not performed and θ = 0 degrees.
【００２９】本実施例では撮影画像のブレは第２群を平
行偏心させるだけで偏心収差の発生量が少なく良好に補
正することができるので十分であるが更に第２群を回転
偏心させれば、より偏心収差の発生を少なくすることが
でき良好なる光学性能を維持することができる。In this embodiment, the blurring of the photographed image is sufficient because the amount of eccentric aberration can be reduced and the eccentric aberration can be corrected satisfactorily only by parallel eccentricity of the second lens unit. Thus, the occurrence of eccentric aberration can be further reduced, and good optical performance can be maintained.
【００３０】次に本発明の防振機能を有した変倍光学系
の光学的特徴について説明する。Next, the optical characteristics of the variable power optical system having the image stabilizing function of the present invention will be described.
【００３１】一般に光学系の一部のレンズ群を平行偏心
させて画像のブレを補正しようとすると偏心収差の発生
により結像性能が低下してくる。そこで次に任意の屈折
力配置において可動レンズ群を光軸と直交する方向に移
動させて画像のブレを補正するときの偏心収差の発生に
ついて収差論的な立場より、第２３回応用物理学講演会
（１９６２年）に松居より示された方法に基づいて説明
する。In general, if an attempt is made to correct image blurring by decentering a part of the lens units of the optical system in parallel, the imaging performance is reduced due to the occurrence of eccentric aberration. The 23rd Applied Physics Lecture on the occurrence of eccentric aberration when moving the movable lens group in the direction perpendicular to the optical axis in an arbitrary refractive power arrangement to correct image blurring The meeting is based on the method presented by Matsui at the meeting (1962).
【００３２】変倍光学系の一部のレンズ群ＰをＥだけ平
行偏心させたときの全系の収差量ΔＹ１は（ａ）式の如
く偏心前の収差量ΔＹと偏心によって発生した偏心収差
量ΔＹ（Ｅ）との和になる。ここで収差量ΔＹは球面収
差（Ｉ）、コマ収差（II）、非点収差 (III)、ペッツバ
ール和（Ｐ）、歪曲収差（Ｙ）で表される。又偏心収差
ΔＹ（Ｅ）は（Ｃ）式に示すように１次の偏心コマ収差
(II Ｅ) 、１次の偏心非点収差(III Ｅ) 、１次の偏心
像面弯曲（ＰＥ）、１次の偏心歪曲収差（ＶＥ１）、１
次の偏心歪曲附加収差（ＶＥ２）、そして１次の原点移
動（ΔＥ）で表される。When a part of the lens unit P of the variable power optical system is decentered in parallel by E, the aberration amount ΔY1 of the whole system is the aberration amount ΔY before the decentering and the eccentric aberration generated by the eccentricity as shown in the equation (a). ΔY (E). Here, the aberration amount ΔY is represented by spherical aberration (I), coma aberration (II), astigmatism (III), Petzval sum (P), and distortion (Y). The eccentric aberration ΔY (E) is the first-order eccentric coma as shown in the equation (C).
(IIE), first-order eccentric astigmatism (IIIE), first-order eccentric field curvature (PE), first-order eccentric distortion (VE1), 1
It is expressed by the following eccentric distortion additive aberration (VE2) and the first-order origin movement (ΔE).
【００３３】又（ｄ）式から（ｉ）式の（ΔＥ）〜（Ｖ
Ｅ２）までの収差はレンズ群Ｐを平行偏心させる変倍光
学系においてレンズ群Ｐへの光線の入射角をαP ，αａ
P としたときにレンズ群Ｐの収差係数ＩP ，IIP ，II
IP，ＰP ，ＶP と、又同様にレンズ群Ｐより像面側に配
置したレンズ群を全体として１つの第ｑレンズ群とした
ときの収差係数をＩq ，IIq ，IIIq ，Ｐq ，Ｖq を用
いて表される。From equations (d) to (i), (ΔE) to (V)
The aberrations up to E2) are caused by changing the incident angles of light rays on the lens unit P to α P and α
Aberration coefficients of the lens unit P when the P I P, II P, II
I q , II q , III q , and I p , P p , and V p, and similarly the aberration coefficients when the lens group disposed on the image plane side of the lens group P as a whole is the q-th lens group. It is represented using P q and V q .
【００３４】[0034]
【数１】 (VE1) = α'P Vq - αP(VP+Vq)- αaP'IIIq +αaP( IIIP+IIIq ) = hP φP Vq - αP VP -(haPφP IIIq -αaPIIIP ) ‥‥‥(h) (VE2) = αaPPq - αaP( PP + Pq ) = haPφP Pq - αaPPP ‥‥‥(i) 以上の式から偏心収差の発生を小さくする為にはレンズ
群Ｐの諸収差係数ＩP，IIP , IIIP，ＰP ，ＶP を小さ
な値とするか、若しくは（ａ）式〜（ｉ）式に示すよう
に諸収差係数を互いに打ち消し合うようにバランス良く
設定することが必要となってくる。(Equation 1) (VE1) = α ' P V q -α P (V P + V q )-αa P ' III q + αa P (III P + III q ) = h P φ P V q -α P V P- (ha P φ P III q -αa P III P) ‥‥‥ (h) (VE2) = αa P P q - αa P (P P + P q) = ha P φ P P q - αa P P P ‥‥‥ aberrations coefficient I P lens group P in order to (i) from the above formula to reduce the occurrence of decentering aberration, II P, III P, P P, or a small value V P, or (a) reacting a compound of formula As shown in Equations (1) to (i), it is necessary to set various aberration coefficients in a well-balanced manner so as to cancel each other.
【００３５】次に本発明の防振機能を有した変倍光学系
の光学的作用を図９に示した撮影光学系の一部のレンズ
群を光軸と直交する方向に偏心駆動させて撮影画像の変
位を補正する防振光学系を想定したモデルについて説明
する。Next, the optical action of the variable power optical system having the image stabilizing function of the present invention is performed by eccentrically driving a part of the lens groups of the photographing optical system shown in FIG. 9 in a direction perpendicular to the optical axis. A model assuming an image stabilizing optical system for correcting image displacement will be described.
【００３６】まず十分に少ない偏心駆動量で十分に大き
い変位補正を実現する為には上記の１次の原点移動（Δ
Ｅ）を十分に大きくする必要がある。このことを踏まえ
た上で１次の偏心像面湾曲（ＰＥ）を補正する条件を考
える。図９は撮影光学系を物体側から順に第ｏ群、第ｐ
群、第ｑ群の３つのレンズ群で構成し、このうち第ｐ群
を光軸と直交する方向に平行移動させて画像のブレを補
正している。First, in order to realize a sufficiently large displacement correction with a sufficiently small eccentric drive amount, the first-order origin movement (Δ
E) needs to be sufficiently large. Considering this, a condition for correcting the first-order eccentric field curvature (PE) will be considered. FIG. 9 shows the photographing optical system in order from the object side to the o-th group and the p-th group.
It is composed of three lens groups, a group and a q-th group. Of these, the p-th group is moved in parallel in a direction orthogonal to the optical axis to correct image blur.
【００３７】ここで第ｏ群、第ｐ群、第ｑ群の屈折力を
それぞれφo ，φp ，φq とし、各レンズ群への近軸軸
上光線と軸外光線の入射角をα，αａ、近軸軸上光線と
軸外光線の入射高をｈ，ｈａ及び収差係数にも同様のｓ
ｕｆｆｉｘを付して表記する。又各レンズ群はそれぞれ
少ないレンズ枚数で構成されるものとし、各収差係数は
それぞれ補正不足の傾向を示すものとする。Here, the refractive powers of the o-th group, the p-th group, and the q-th group are denoted by φ o , φ p , and φ q , respectively, and the incident angles of the paraxial on-axis ray and the off-axis ray to each lens group are α , Αa, the incident heights of the paraxial on-axis ray and the off-axis ray are similarly set to h, ha and the aberration coefficient.
Notation is added with uffix. Also, each lens group is composed of a small number of lenses, and each aberration coefficient shows a tendency of insufficient correction.
【００３８】このような前提のもとに各レンズ群のペッ
ツバール和に着目すると各レンズ群のペッツバール和Ｐ
o ，Ｐp ，Ｐq は各レンズ群の屈折力φo ，φp ，φq
に比例し、略 Ｐo ＝Ｃφo Ｐp ＝Ｃφp Ｐq ＝Ｃφq （但しＣは定数） なる関係を満足する。従って第ｐ群を平行偏心させたと
きに発生する１次の偏心像面湾曲（ＰＥ）は上式と代入
して次のように整理することができる。Focusing on the Petzval sum of each lens group based on the above premise, the Petzval sum P of each lens group
o , P p , and P q are the refractive powers φ o , φ p , and φ q of each lens group.
Proportional to approximately P o = Cφ o P p = Cφ p P q = Cφ q ( where C is a constant) satisfies the following relationship. Therefore, the first-order eccentric field curvature (PE) generated when the p-th unit is decentered in parallel can be rearranged as follows by substituting the above equation.
【００３９】（ＰＥ）＝Ｃφp （ｈp φq −αp ） 従って偏心像面湾曲（ＰＥ）を補正するためにはφp ＝
０またはφq ＝αp ／ｈp とすることが必要となる。と
ころがφp ＝０とすると１次の原点移動（ΔＥ）が０と
なって変位補正ができなくなるためφq ＝αp ／ｈp を
満足する解を求めなければならない。即ちｈp ＞０であ
るため、少なくともαp とφq を同符号とすることが必
要となるわけである。[0039] (PE) = Cφ p (h p φ q -α p) Thus in order to correct decentering field curvature a (PE) is phi p =
Be 0 or φ q = α p / h p is required. However phi p = 0 to the primary origin movement (Delta] E) must seek a solution that satisfies φ q = α p / h p it becomes impossible displacement correction is 0. That is, since h p > 0, it is necessary that at least α p and φ q have the same sign.
【００４０】（イ） αp ＞０のとき 偏心像面湾曲の補正のためφq ＞０、又必然的にφo ＞
０となる。更にこのときφp ＞０とすると０＜αp ＜α
´p ＜１、１次の原点移動（ΔＥ）は次のようになる。(A) When α p > 0 φ q > 0 for correcting the eccentric field curvature, and inevitably φ o >
It becomes 0. Further, if φ p > 0 at this time, 0 <α p <α
' P <1, the primary origin movement (ΔE) is as follows.
【００４１】（ΔＥ）＝−２（αp ´−αp ）＞−２ 即ち偏心敏感度（偏心レンズ群の単位変位量に対する撮
影画像のブレの変位量との比）が１より小さくなる。又
前述のようにφp ＝０では偏心敏感度は０となる。従っ
て、このような場合にはφp ＜０としなければならな
い。(ΔE) = − 2 (α p ′ −α p )> − 2 That is, the eccentric sensitivity (the ratio of the amount of displacement of the photographic image to the unit displacement of the eccentric lens group) is smaller than 1. As described above, when φ p = 0, the eccentric sensitivity becomes zero. Therefore, in such a case, φ p <0 must be satisfied.
【００４２】（ロ） αp ＜０のとき 偏心像面湾曲（ＰＥ）の補正の為φq ＜０、又必然的に
φo ＜０、従って更に必然的にφp ＞０となる。(B) When α p <0 φ q <0, and inevitably φ o <0, and thus φ p > 0 inevitably because of the correction of the eccentric curvature of field (PE).
【００４３】以上より１次の原点移動（ΔＥ）を十分に
大きくしつつ、１次の偏心像面湾曲（ＰＥ）を補正する
ことの可能となる光学系の屈折力配置は次のようなもの
が適する。As described above, the refractive power arrangement of the optical system that can correct the primary eccentric curvature of field (PE) while sufficiently increasing the primary origin movement (ΔE) is as follows. Is suitable.
【００４４】[0044]
【表１】 このような屈折力配置のレンズ構成を図示すると、それ
ぞれ図１０（Ａ）及び図１０（Ｂ）のようになる。[Table 1] FIG. 10A and FIG. 10B respectively show a lens configuration having such a refractive power arrangement.
【００４５】次に望遠型の長焦点距離領域を含む変倍光
学系（ズームレンズ）にこれらの屈折力配置を適用す
る。Next, these refractive power arrangements are applied to a variable power optical system (zoom lens) including a telephoto long focal length region.
【００４６】望遠型のズームレンズを想定するのは画像
のブレが画質を低下させやすい焦点距離領域を対象と
し、防振機能がより効果的となる状況を想定した為であ
る。The telephoto zoom lens is assumed for a focal length region where image blur is likely to reduce the image quality, and a situation where the image stabilizing function is more effective is assumed.
【００４７】従来より望遠型のズームレンズとして、変
倍に係わるレンズ群の屈折力配置が物体側から順に正、
負、正、正という構成の４群ズームレンズがある。Conventionally, as a telephoto-type zoom lens, the refractive power arrangement of the lens unit related to zooming is positive,
There is a four-group zoom lens having a configuration of negative, positive, and positive.
【００４８】この４群ズームレンズでは広角端から望遠
端への変倍に際して主として変倍に寄与させるため、第
１群あるいは第２群あるいは第１群と第２群の両方を光
軸上で移動させると共に、主として像面位置を一定に保
つため第３群を光軸上で移動させる構成としたものが広
く知られている。In this four-unit zoom lens, the first lens unit, the second lens unit, or both the first lens unit and the second lens unit are moved on the optical axis in order to mainly contribute to zooming during zooming from the wide-angle end to the telephoto end. In addition, it is widely known that the third lens unit is moved on the optical axis in order to keep the image plane position constant.
【００４９】このような構成の望遠型のズームレンズは
レンズ全長がやや長くなるものの、全ズーム域において
諸収差を良好に補正することが比較的容易であり、又第
４群をズーミングに際して固定とするため、ズーミング
のための機構を第１、第２、第３群の周囲に配置するの
みで十分であって、振動補償のために必要となる機構部
品、例えば振動検知センサ、電源等を主として第４群の
周囲に配置することによりレンズ外径の大型化を防ぐこ
とができる。Although the telephoto zoom lens having such a configuration has a slightly longer overall lens length, it is relatively easy to satisfactorily correct various aberrations in the entire zoom range, and the fourth lens unit is fixed when zooming. Therefore, it is sufficient to arrange a mechanism for zooming around the first, second, and third groups, and mainly the mechanical components required for vibration compensation, such as a vibration detection sensor and a power supply. By arranging it around the fourth group, it is possible to prevent the lens outer diameter from increasing.
【００５０】次にこのような望遠型のズームレンズの一
部のレンズ群を光軸と垂直な方向に移動させて振動補償
を行う方法について説明する。Next, a method of compensating vibration by moving a part of the lens group of such a telephoto type zoom lens in a direction perpendicular to the optical axis will be described.
【００５１】振動補償に適するレンズ群は装置の大型化
を防ぐとともに振動補償を行った際の画質の劣化を防ぐ
ために、外径の小さいレンズ群で前述の偏心敏感度が十
分に大きく、かつ偏心収差の発生の少ないレンズ群であ
る必要がある。これらの点に着目し、前述の望遠型のズ
ームレンズの各レンズ群、又はその一部を振動補償のた
めに用いることについて考察する。A lens group suitable for vibration compensation is a lens group having a small outer diameter and having a sufficiently large eccentric sensitivity and a large eccentricity in order to prevent the apparatus from becoming large and to prevent the image quality from deteriorating when the vibration compensation is performed. It is necessary that the lens group generate less aberration. Focusing on these points, consideration will be given to using each lens group or a part of the above-described telephoto zoom lens for vibration compensation.
【００５２】 （１−１）第１群又はその一部を用いる場合。 一般に前述の望遠型のズームレンズの第１群は比較的強
い正の屈折力を持ち、第２、第３、第４群の合成屈折力
は負となる。従ってこの場合は図１０（Ｂ）のタイプか
ら負の屈折力の第０群を削除したものに相当する。第１
群へ入射する近軸光線の入射角αP は物体距離に応じて
変化するもののαP ≦０となっているため、偏心像面湾
曲（ＰＥ）の補正条件は満足する。(1-1) When the first group or a part thereof is used. Generally, the first group of the telephoto zoom lens described above has a relatively strong positive refractive power, and the combined refractive power of the second, third, and fourth groups is negative. Therefore, this case corresponds to a case where the zeroth group having a negative refractive power is deleted from the type of FIG. First
Although the incident angle α P of the paraxial ray entering the group changes according to the object distance, α P ≦ 0, so that the correction condition of the eccentric field curvature (PE) is satisfied.
【００５３】しかしながら第１群の外径は全レンズ群の
中でも最も大きくなる傾向を持っており、そのためレン
ズ重量も重く、装置の小型化の妨げとなる点やレンズ駆
動の負荷が大きくなるという点で問題があるため振動補
償用のレンズ群としては適さない。However, the outer diameter of the first lens unit tends to be the largest among all the lens units, so that the weight of the lens unit is heavy, which hinders downsizing of the apparatus and increases the load for driving the lens unit. Therefore, it is not suitable as a lens group for vibration compensation.
【００５４】 （１−２）第２群又はその一部を用いる場合。 第１群は比較的強い正の屈折力、第２群は強い負の屈折
力を持ち、第３、第４群の合成屈折力は正となる。従っ
てこの場合は図１０（Ａ）のタイプに相当し、偏心像面
湾曲（ＰＥ）の補正条件は満足する。又第２群は比較的
レンズ外径が小さく、装置の小型化には適している。前
述の偏心敏感度についても元来、屈折力の強いレンズ群
であるため大きくし易いというメリットもある。(1-2) The case where the second group or a part thereof is used. The first group has a relatively strong positive refractive power, the second group has a strong negative refractive power, and the combined refractive power of the third and fourth groups is positive. Therefore, this case corresponds to the type shown in FIG. 10A, and the correction condition of the eccentric field curvature (PE) is satisfied. The second lens group has a relatively small lens outer diameter and is suitable for miniaturization of the apparatus. The eccentric sensitivity described above also has an advantage that it is easy to increase the size because it is a lens group having a strong refractive power.
【００５５】以上より第２群は振動補償用のレンズ群と
して適している。本発明はこのように第２群を振動補償
用のレンズ群として光軸と垂直な方向に移動させるか、
又はそれと共に光軸上の一点を回転中心として回転させ
ている。As described above, the second group is suitable as a lens group for vibration compensation. According to the present invention, the second group is moved in the direction perpendicular to the optical axis as a lens group for vibration compensation,
Alternatively, it is rotated about one point on the optical axis as the center of rotation.
【００５６】 （１−３）第３群又はその一部を用いる場合。 第１、第２群の合成屈折力は広角端では強い負となり、
望遠端でも弱い負となる傾向を持っている。又第３群は
正の屈折力、第４群は比較的弱い正の屈折力を持ってい
るため、このままでは前述の偏心像面湾曲（ＰＥ）の補
正条件は満足しない。そこで第４群が比較的弱い正の屈
折力を持ったレンズ群であることに着目して、このレン
ズ群のペッツバール和を負の値とすることにより、この
問題を解決することも考えられるが、ズーミングによる
諸収差の変動を補正するため第３群の屈折力をあまり強
くできないために、前述の第２群を振動補償用のレンズ
群として用いる場合と比べて前述の偏心敏感度を大きく
することができない。(1-3) When the third group or a part thereof is used. The combined refracting power of the first and second groups is strongly negative at the wide-angle end,
It has a weak negative tendency even at the telephoto end. Since the third lens unit has a positive refractive power and the fourth lens unit has a relatively weak positive refractive power, the above-mentioned condition for correcting the eccentric curvature of field (PE) is not satisfied. Therefore, focusing on the fact that the fourth group is a lens group having a relatively weak positive refractive power, it is possible to solve this problem by setting the Petzval sum of this lens group to a negative value. Since the refractive power of the third lens unit cannot be increased so much to correct fluctuations of various aberrations due to zooming, the eccentric sensitivity is increased as compared with the case where the second lens unit is used as a lens unit for vibration compensation. Can not do.
【００５７】又、この第３群を物体側から順に正レンズ
群及び負レンズ群の２つのレンズ群に分割して、そのど
ちらかのレンズ群を振動補償に用いることによって偏心
敏感度を大きくすることも考えられる。The third lens unit is divided into two lens units, a positive lens unit and a negative lens unit, in order from the object side, and one of the lens units is used for vibration compensation to increase eccentric sensitivity. It is also possible.
【００５８】しかしながら十分に大きい偏心敏感度を得
るためには強い屈折力のレンズ群に分割することが必要
となり、従って諸収差の発生を防止するために第３群を
構成するレンズ枚数を多くすることが必要となって小型
化に適さなくなる。However, in order to obtain a sufficiently high eccentric sensitivity, it is necessary to divide the lens unit into a lens unit having a strong refractive power. Therefore, in order to prevent the occurrence of various aberrations, the number of lenses constituting the third unit is increased. This makes it unsuitable for miniaturization.
【００５９】以上より、第３群を振動補償用レンズ群と
して用いるのは前述の第２群を用いる場合と比べて劣っ
ている。As described above, the use of the third unit as a lens unit for vibration compensation is inferior to the case of using the second unit.
【００６０】 （１−４）第４群又はその一部を用いる場合。 第１、第２、第３群の合成屈折力は、符号は特定できな
いが比較的弱い屈折力となり、略アフォーカルズームを
構成する。又第４群は結像作用を有する正レンズ群とな
っているため、第４群全体を振動補償用のレンズ群とし
て用いる場合は、前述の図１０（Ｂ）のタイプの第０
群、及び第ｑ群の屈折力をいずれも０としたものに相当
する。(1-4) When the fourth group or a part thereof is used. The combined refractive powers of the first, second, and third groups are relatively weak refractive powers, although the sign cannot be specified, and constitute a substantially afocal zoom. Further, since the fourth unit is a positive lens unit having an image forming function, when the entire fourth unit is used as a lens unit for vibration compensation, the fourth unit is a positive lens unit of the type shown in FIG.
This corresponds to the case where the refractive powers of the group and the q-th group are both 0.
【００６１】従ってこの場合には諸偏心収差の補正は比
較的容易となるが、前述の偏心敏感度が略１となり、十
分な振動補償効果を得るために、大きなレンズ駆動が必
要となるため、振動補償用のレンズ群として適さない。Therefore, in this case, the correction of various eccentric aberrations is relatively easy, but the above-mentioned eccentric sensitivity becomes substantially 1 and a large lens drive is required to obtain a sufficient vibration compensation effect. Not suitable as a lens group for vibration compensation.
【００６２】そこで第４群を図１０（Ａ），（Ｂ）に示
したような構成、即ち物体側から順に正レンズ群、負レ
ンズ群、正レンズ群の３つのレンズ群に分割して、分割
された負レンズ群を用いて振動補償を行う構成、及び物
体側から順に負レンズ群、正レンズ群、負レンズ群の３
つのレンズ群に分割して、分割された正レンズ群を用い
て振動補償を行う構成とすることが考えられる。Therefore, the fourth group is divided into three lens groups of a positive lens group, a negative lens group, and a positive lens group in order from the object side, that is, as shown in FIGS. 10A and 10B. A configuration in which vibration compensation is performed using the divided negative lens group, and three of a negative lens group, a positive lens group, and a negative lens group in this order from the object side.
It is conceivable to divide the lens into two lens groups and perform vibration compensation using the divided positive lens group.
【００６３】このような構成とすれば諸偏心収差の補正
は可能となると推測されるが、このように第４群の構成
を限定すると第４群の形状を適切にすることにより、レ
ンズ全長を短くするという、この種の望遠型のズームレ
ンズのコンパクト化のための手法を制限されることにな
り、レンズ全長のコンパクト化には適さなくなる。又第
４群の適切な構成により、コンパクト化をも実現し得た
としても前述の第２群を振動補償用のレンズ群として用
いる場合と比べて第４群の構成枚数を多くすることが必
要となり、小型化あるいは低コスト化に適さないという
問題もある。It is presumed that such a configuration makes it possible to correct various eccentric aberrations. However, when the configuration of the fourth unit is limited as described above, the overall length of the lens can be reduced by appropriately setting the shape of the fourth unit. The technique of reducing the size of the telephoto zoom lens, which is to shorten it, is limited, and is not suitable for reducing the overall length of the lens. Further, even if the fourth unit can be made compact by a proper configuration of the fourth unit, it is necessary to increase the number of components of the fourth unit compared with the case where the second unit is used as a lens unit for vibration compensation. Therefore, there is also a problem that it is not suitable for size reduction or cost reduction.
【００６４】以上説明したような理由から、本発明では
物体側より順に正の屈折力を有する第１群、負の屈折力
を有する第２群、正の屈折力を有する第３群及び正の屈
折力を有する第４群より構成され、広角端から望遠端へ
の変倍に際し、主として変倍に寄与させるため、前記第
１群と前記第２群を互いの間隔を増加させながら光軸上
で移動させると共に、主として像面位置を一定に保つた
めに前記第３群を光軸上で移動させる変倍光学系におい
て、前記第２群を光軸と垂直な方向に移動させるか、又
はそれと共に光軸上の一点を回転中心として回転させる
ことにより振動を補償する構成としている。For the reasons described above, according to the present invention, in order from the object side, the first lens unit having a positive refractive power, the second lens unit having a negative refractive power, the third lens unit having a positive refractive power, and the positive lens unit The first lens unit and the second lens unit are arranged on the optical axis while increasing the distance between each other in order to mainly contribute to zooming during zooming from the wide-angle end to the telephoto end. In the variable power optical system for moving the third unit on the optical axis in order to keep the image plane position constant, the second unit is moved in a direction perpendicular to the optical axis, or At the same time, the vibration is compensated by rotating about one point on the optical axis as a center of rotation.
【００６５】次にこのような振動補償変倍光学系におい
て、前述の偏心敏感度、即ち１次の原点移動（ΔＥ）を
十分に大きく保ちつつ、１次の偏心像面湾曲（ＰＥ）を
十分に小さく補正する前述の条件式（１）〜（３）につ
いて説明する。Next, in such a vibration compensation variable magnification optical system, the above-mentioned eccentric sensitivity, that is, the primary origin movement (ΔE) is kept sufficiently large, and the primary eccentric field curvature (PE) is sufficiently obtained. The above-mentioned conditional expressions (1) to (3) for correcting the distance to a smaller value will be described.
【００６６】尚、本発明においては特に振動補償効果が
顕著となると共に偏心収差の発生の著しくなる望遠端を
重視し、偏心収差補正のための条件を設定しているが、
本発明の諸条件を満足する振動補償の変倍光学系を達成
すれば広角端において同程度の角度まで振動補償を行っ
ても、像面上での補償量が少ないために十分に良好な画
像を得ることができる。In the present invention, the condition for correcting the eccentric aberration is set by focusing on the telephoto end where the vibration compensation effect is particularly remarkable and the occurrence of the eccentric aberration is remarkable.
If a variable-magnification optical system for vibration compensation that satisfies the conditions of the present invention is achieved, even if vibration compensation is performed to the same angle at the wide-angle end, a sufficiently good image can be obtained because the amount of compensation on the image plane is small. Can be obtained.
【００６７】まず望遠端における偏心像面湾曲に着目す
る。望遠端の光学系全体の屈折力を１に正規化した際の
第１群のペッツバール和をＰI 、第２群のペッツバール
和をＰII、第３群及び第４群のペッツバール和をＰIII
IIIIとすれば、各々のペッツバール和の符号は各レンズ
群の屈折力に依存し、略次のようになる。First, attention is paid to the eccentric curvature of field at the telephoto end. When the refractive power of the entire optical system at the telephoto end is normalized to 1, the Petzval sum of the first group is P I , the Petzval sum of the second group is P II , and the Petzval sum of the third and fourth groups is P III.
Assuming IIII , the sign of each Petzval sum depends on the refractive power of each lens group and is approximately as follows.
【００６８】ＰI ＞０ ＰII＜０ ＰIII IIII＞０ 又、像面湾曲を十分に補正するために、全系のペッツバ
ール和Ｐを次の関係を略満足するように設定する必要が
ある。P I > 0 P II <0 P III IIII > 0 Further, in order to sufficiently correct the field curvature, it is necessary to set the Petzval sum P of the entire system to substantially satisfy the following relationship. .
【００６９】Ｐ＝ＰI ＋ＰII＋ＰIII IIII≒０ 即ち ＰI ≒−（ＰII＋ＰIII IIII） 一方、第１群と第２群は変倍に際して互いの間隔を変化
させるように少なくとも一方が光軸上を移動するレンズ
群である上に、特に第１群はレンズ外径が大きく、又第
２群は振動補償にも用いるため、小型軽量化のために、
どちらも可能な限り少ないレンズ枚数で構成する必要が
ある。P = P I + P II + P III IIII ≒ 0, ie, P I ≒ − (P II + P III IIII ) On the other hand, at least one of the first and second units is changed so as to change the distance between them during zooming. In addition to the lens group moving on the optical axis, the first group has a large lens outer diameter, and the second group is also used for vibration compensation.
Both need to be configured with as few lenses as possible.
【００７０】このような構成とした場合、各群のペッツ
バール和は略各群の屈折力と比例する関係となるが、通
常このような望遠型のズームレンズの第２群の屈折力の
絶対値は第１群の屈折力の絶対値の３〜４倍程度となっ
ており、従ってペッツバール和の関係も略同程度となっ
ている。In such a configuration, the Petzval sum of each group has a relationship substantially proportional to the refractive power of each group. Usually, the absolute value of the refractive power of the second group of such a telephoto zoom lens is described. Is about 3 to 4 times the absolute value of the refractive power of the first lens unit, and therefore the Petzval sum is also substantially the same.
【００７１】そのため第１群のペッツバール和ＰI と第
３群及び第４群のペッツバール和ＰIII IIIIの関係は通
常、 ０＜ＰI ＜ＰIII IIII となっている。Therefore, the relationship between the Petzval sum P I of the first group and the Petzval sum P III IIII of the third and fourth groups is usually 0 <P I <P III IIII .
【００７２】ペッツバール和の大小関係がこのような状
況にあることを考慮して前述の偏心像面湾曲を表す式
（ｇ）の各項に注目し、第２群に入射する近軸光線の入
射角及び第２群から射出し第３群に入射する近軸光線の
入射角を適切に設定すれば偏心像面湾曲を良好に補正す
ることができる。Considering that the magnitude relation of the Petzval sum is in such a situation, attention is paid to each term of the above-described equation (g) representing the eccentric field curvature, and the incidence of the paraxial ray incident on the second lens unit is described. By appropriately setting the angle and the incident angle of the paraxial ray emitted from the second group and incident on the third group, the eccentric curvature of field can be corrected well.
【００７３】本発明の条件式（１），（２），（３）は
前述の関係を考慮し、諸収差を良好に補正しつつ、現実
的に偏心像面湾曲を良好に補正するための条件を表す式
である。The conditional expressions (1), (2), and (3) of the present invention take into account the above-mentioned relations, and satisfactorily correct various aberrations and realistically satisfactorily correct eccentric curvature of field. This is an expression representing a condition.
【００７４】条件式（１）は望遠端の光学系全体の屈折
力に対する第１群の屈折力の割合を表す式である。条件
式（１）の下限値を越えて、第１群の屈折力が弱くなる
と第２群へ入射する近軸光線の入射角が小さくなり、偏
心像面湾曲の補正が困難になると同時に変倍のための第
１群と第２群の間の間隔変化量を大きくしなければなら
なくなってレンズ全長が長くなる傾向を示す。Conditional expression (1) is an expression representing the ratio of the refractive power of the first lens unit to the refractive power of the entire optical system at the telephoto end. If the lower limit of conditional expression (1) is exceeded and the refractive power of the first lens unit is weakened, the angle of incidence of paraxial rays incident on the second lens unit will be small, making it difficult to correct eccentric field curvature and at the same time zooming. Therefore, the amount of change in the distance between the first unit and the second unit must be increased, and the overall length of the lens tends to increase.
【００７５】条件式（１）の上限値を越えて第１群の屈
折力が強くなると第１群の諸収差係数の値を小さくする
ことが困難となり、従って変倍に伴う諸収差の変動、特
に球面収差、コマ収差等の変動を小さくすることが難し
くなる。When the refractive power of the first lens unit is increased beyond the upper limit value of the conditional expression (1), it becomes difficult to reduce the values of the various aberration coefficients of the first lens unit. In particular, it is difficult to reduce fluctuations in spherical aberration, coma, and the like.
【００７６】条件式（２）は望遠端の光学系全体の屈折
力に対する望遠端の第１群と第２群の合成屈折力の割合
を表す式である。条件式（２）は条件式（１）と組み合
わせることにより、望遠端における第１群と第２群の合
成屈折力を規定するものであって、偏心像面湾曲の補正
を実現すると共に１次の原点移動（ΔＥ）、即ち偏心敏
感度を十分に大きく保つための条件式である。Conditional expression (2) is an expression representing the ratio of the combined refractive power of the first and second lens units at the telephoto end to the refractive power of the entire optical system at the telephoto end. Conditional expression (2), when combined with conditional expression (1), defines the combined refractive power of the first and second lens units at the telephoto end. Is the conditional expression for keeping the origin shift (ΔE), that is, the eccentric sensitivity sufficiently large.
【００７７】条件式（２）の下限値を越えて、望遠端の
第１群と第２群の負の合成屈折力が強くなると第２群か
ら射出し第３群へ入射する近軸光線の入射角が負の絶対
値の大きな値となって偏心像面湾曲の補正が困難とな
る。条件式（２）の上限値を越えて望遠端の第１群と第
２群の負の合成屈折力が弱くなると偏心像面湾曲の補正
は比較的容易とはなるが、第２群の屈折力を負の弱い値
とすることが必要となって偏心敏感度を十分に大きくす
ることができなくなる。When the lower limit of conditional expression (2) is exceeded and the negative combined refractive power of the first and second units at the telephoto end becomes stronger, the paraxial rays that exit from the second unit and enter the third unit will be described. The incident angle becomes a large negative absolute value, making it difficult to correct the eccentric curvature of field. If the negative combined refractive power of the first and second lens units at the telephoto end is weakened beyond the upper limit value of the conditional expression (2), the correction of the eccentric curvature of field becomes relatively easy, but the refraction of the second lens unit becomes relatively easy. The force must be set to a weak negative value, and the eccentric sensitivity cannot be sufficiently increased.
【００７８】条件式（３）は望遠端における光学系全体
の屈折力を１に正規化した際の第３群と第４群のペッツ
バール和の範囲を規定するものである。Conditional expression (3) defines the range of the Petzval sum of the third and fourth units when the refractive power of the entire optical system at the telephoto end is normalized to 1.
【００７９】条件式（３）の下限値を越えて、第３群と
第４群のペッツバール和の値を小さくすると光学系全体
のペッツバール和を適切な値とすることが困難となり、
像面湾曲が補正過剰となってしまう。条件式（３）の上
限値を越えて第３群と第４群のペッツバール和の値を大
きくすると像面湾曲を適切に補正しつつ偏心像面湾曲を
補正することが困難となる。If the Petzval sum of the third and fourth lens units is reduced below the lower limit of conditional expression (3), it becomes difficult to set the Petzval sum of the entire optical system to an appropriate value.
The field curvature becomes excessively corrected. If the Petzval sum of the third lens unit and the fourth lens unit is increased beyond the upper limit of conditional expression (3), it becomes difficult to correct the eccentric field curvature while properly correcting the field curvature.
【００８０】本発明では以上説明したように、条件式
（１）及び条件式（２）によって第２群へ入射する近軸
光線の入射角及び第３群へ入射する近軸光線の入射角を
適切に設定すると共に条件式（３）によって光学系全体
のペッツバール和の配分を適切に設定することにより、
諸収差を良好に補正しつつ特に振動補償効果が顕著とな
る望遠端において、前述の（ｇ）式に示される１次の偏
心像面湾曲の値を小さくすることを達成し、偏心像面湾
曲を良好に補正し、振動補償をした変倍光学系を実現し
ている。As described above, in the present invention, the incident angles of the paraxial rays incident on the second lens unit and the paraxial rays incident on the third lens unit are determined by the conditional expressions (1) and (2). By appropriately setting and appropriately setting the distribution of Petzval sum of the entire optical system by the conditional expression (3),
At the telephoto end where the vibration compensation effect is particularly remarkable while various aberrations are well corrected, the value of the first-order eccentric field curvature shown in the above equation (g) is reduced, and the eccentric field curvature is achieved. Satisfactorily is corrected, and a variable power optical system with vibration compensation is realized.
【００８１】前述のようにして諸収差を良好に補正しつ
つ、偏心像面湾曲を補正可能とした振動補償の変倍光学
系において、諸偏心収差を更に良好に補正するための条
件について考える。Conditions for further correcting various eccentric aberrations in a vibration-compensating variable power optical system capable of correcting eccentric field curvature while correcting various aberrations as described above will be considered.
【００８２】前述の偏心像面の補正を実現するために第
２群及び第３群へ入射する近軸光線の存在範囲は限定さ
れている。In order to realize the above-described correction of the decentered image plane, the range of existence of paraxial rays incident on the second and third units is limited.
【００８３】そこで他の偏心収差を補正するためには各
レンズ群の収差係数の大小関係を適切に設定するか、瞳
近軸光線の入射角を適切に設定することが必要となる。
瞳近軸光線の入射角を適切に設定するためには絞りの位
置を移動させる手段と、各レンズ群の屈折力配置を変更
する手段があるが、レンズの外径や全長をコンパクトに
する条件や、前述の偏心像面湾曲を補正する条件を考慮
すれば、この２つの手段はどちらもほとんど用いること
ができない。そこで、各レンズ群の収差係数の大小関係
を適切に設定することが必要となる。Therefore, in order to correct other decentering aberrations, it is necessary to appropriately set the magnitude relationship between the aberration coefficients of each lens unit, or to appropriately set the incident angle of the pupil paraxial ray.
In order to properly set the incident angle of the pupil paraxial ray, there are means for moving the position of the stop and means for changing the refractive power arrangement of each lens group. Considering the conditions for correcting the eccentric field curvature described above, neither of these two means can be used. Therefore, it is necessary to appropriately set the magnitude relationship between the aberration coefficients of each lens group.
【００８４】前述した４群構成の変倍光学系において、
レンズ全長をコンパクトにすると共にズーミングの際の
レンズ群の移動量を極力少なくするために、第１群及び
第２群の屈折力は通常比較的強く設定されている。In the four-unit variable power optical system described above,
In order to make the overall length of the lens compact and to minimize the amount of movement of the lens unit during zooming, the refractive powers of the first and second units are usually set relatively high.
【００８５】又、これらのレンズ群はレンズ全長のコン
パクト化や、低コスト化のために少数枚のレンズ構成と
するのが一般的であって、そのため必然的に第１群及び
第２群の３次収差係数は補正不足型の比較的大きな値と
なっている。特に望遠端に注目すれば、第１群は近軸軸
上光線の入射高が高く、又全系の屈折力に比して強い屈
折力を持ったレンズ群であるため、特に球面収差係数が
大きくなる傾向を持っている。In addition, these lens groups are generally composed of a small number of lenses in order to make the overall length of the lens compact and to reduce the cost, so that the first and second groups are necessarily inevitably formed. The third-order aberration coefficient has a relatively large value of the undercorrected type. Paying particular attention to the telephoto end, the first lens group is a lens group having a high incident height of paraxial axial rays and having a strong refractive power compared with the refractive power of the entire system. Has a tendency to grow.
【００８６】そこでこのような構成の変倍光学系におい
ては第２群の球面収差係数を適切にすることによって第
１群の球面収差係数をキャンセルし、全系の収差を良好
に補正している。Therefore, in the variable power optical system having such a configuration, the spherical aberration coefficient of the first group is canceled by appropriately setting the spherical aberration coefficient of the second group, and the aberration of the entire system is favorably corrected. .
【００８７】又、コマ収差係数等についても、近軸光線
の入射高に対する依存度に応じて球面収差係数とはその
大きさは異なるものの略同様なキャンセル関係にある。Although the coma aberration coefficient and the like have different magnitudes from the spherical aberration coefficient depending on the dependence on the incident height of the paraxial ray, they have substantially the same canceling relationship.
【００８８】このような光学系の特に望遠端において１
次の偏心コマ収差（IIＥ）を小さく補正することを考え
る。At the telephoto end of such an optical system, 1
It is considered that the next eccentric coma (IIE) is corrected to be small.
【００８９】１次の偏心コマ収差を表す前述の（ｅ）式
において、前述の偏心像面湾曲の補正条件を満足するこ
とを考慮し、又このような構成の変倍光学系において
は、レンズ外径のコンパクトのために絞りは通常第２群
より後方に配置されることを考慮すれば、（ｅ）式の中
の近軸光線の入射角は略次のような大小関係を持ってい
る。In the above-mentioned equation (e) representing the first-order eccentric coma, considering that the above-mentioned condition for correcting the eccentric field curvature is satisfied, and in the variable power optical system having such a configuration, the lens Taking into account that the aperture is usually arranged behind the second lens unit due to the compact outer diameter, the incident angle of the paraxial ray in the expression (e) has the following magnitude relationship. .
【００９０】０＜−αP ´＜αP αａP ＜αａP ´＜０ 又、球面収差係数及びコマ収差係数について前述のよう
に、第１群と第２群は略キャンセル関係にあり、第３
群、第４群は比較的小さい値を取るため、（ｅ）式の値
は第１項と第３項は略無視でき、第２項及び第４項の値
が支配的となる。しかも球面収差係数とコマ収差係数の
大小関係は近軸光線の入射高ｈ及びｈａの大小関係に依
存しており、偏心像面湾曲を良好に補正するという条件
下ではその大小関係を制御するのはなかなか困難であ
る。[0090] 0 <-α P '<α P αa P <αa P'<0 Further, for as mentioned above spherical aberration coefficient and coma aberration coefficient, a first group of the second group is in a substantially cancel relationship, the 3
Since the group and the fourth group take relatively small values, the value of the expression (e) is such that the first and third terms can be ignored, and the values of the second and fourth terms are dominant. In addition, the magnitude relation between the spherical aberration coefficient and the coma aberration coefficient depends on the magnitude relation between the incident heights h and ha of the paraxial rays, and the magnitude relation is controlled under the condition that the eccentric field curvature is favorably corrected. It is very difficult.
【００９１】そこで本発明では（ｅ）式に示される１次
の偏心コマ収差の値を小さくするため、（ｅ）式の第４
項及び第５項の値そのものを小さくしている。即ち第１
群及び第２群の球面収差係数及びコマ収差係数を可能な
限り小さい値とするような適切なレンズ形状を提案して
いる。Accordingly, in the present invention, the value of the first-order decentered coma shown in the equation (e) is reduced, so that the fourth
The values of the term and the fifth term themselves are reduced. That is, the first
An appropriate lens shape has been proposed so that the spherical aberration coefficient and the coma aberration coefficient of the group and the second group are as small as possible.
【００９２】レンズ形状の限定は第２群で行っても良い
のだが、第１群の方がレンズ外径が大きくなり易く、コ
ンパクト化のために形状の自由度が少なくなって特徴的
な形状となり易いため、第１群の形状を限定して本発明
を更に良好とした場合の特徴を説明する。The lens group may be limited in the second lens group. However, the first lens group has a larger lens outer diameter, and has a smaller degree of freedom for compactness, resulting in a characteristic shape. Therefore, the features of the case where the present invention is further improved by limiting the shape of the first group will be described.
【００９３】本発明では更に良好な振動補償の変倍光学
系を達成するために、前述の構成に加えて、更に物体側
より順に前記第１群は物体側に凸面を向けたメニスカス
状の負の第１１レンズと物体側に凸面を向けたメニスカ
ス状の正の第１２レンズとを貼り合わせた接合レンズ、
そして正の第１３レンズの３つのレンズより成り、該第
１群の第ｉ番目のレンズ面の曲率半径をＲ１，ｉ、該第
１群の焦点距離をＦ１としたとき ０．６＜Ｒ１，１／Ｆ１＜１．２ ‥‥‥（４） ３．０＜Ｒ１，３／Ｆ１ ‥‥‥（５） なる条件を満足することを特徴としている。According to the present invention, in order to achieve a better variable magnification optical system for vibration compensation, in addition to the above-described configuration, the first lens unit further includes a meniscus negative lens having a convex surface facing the object side in order from the object side. A cemented lens obtained by bonding an eleventh lens and a positive meniscus twelfth lens having a convex surface facing the object side,
When the radius of curvature of the i-th lens surface of the first group is R1, i and the focal length of the first group is F1, 0.6 <R1, 1 / F1 <1.2 ‥‥‥ (4) 3.0 <R1,3 / F1 ‥‥‥ (5)
【００９４】第１群の形状に上記の限定を施すことによ
って主と振動補償時の画面中心付近の画質に影響を及ぼ
す偏心コマ収差をより良好に補正することができる。By applying the above-described limitation to the shape of the first lens unit, eccentric coma aberration which affects the image quality near the center of the screen during main and vibration compensation can be corrected better.
【００９５】次に上述の条件式（４），（５）及びその
下限値及び上限値について説明する。Next, the above-mentioned conditional expressions (4) and (5) and their lower and upper limits will be described.
【００９６】条件式（４）は第１群の焦点距離に対する
第１群の最も物体側のレンズ面の曲率半径の割合を規定
するものである。Conditional expression (4) defines the ratio of the radius of curvature of the lens surface of the first lens unit closest to the object to the focal length of the first lens unit.
【００９７】条件式（４）の上限値を越えて曲率半径が
緩くなると、第１群の屈折力を適切に保ったまま第１群
の３次の球面収差係数を小さく補正することが困難とな
る。又条件式（４）の下限値を越えて曲率半径がきつく
なるとズーミングにおける諸収差の変動、特に歪曲等の
変動を補正することが困難となる。If the radius of curvature is relaxed beyond the upper limit of conditional expression (4), it is difficult to correct the third-order spherical aberration coefficient of the first lens unit to a small value while maintaining the refractive power of the first lens unit appropriately. Become. If the radius of curvature exceeds the lower limit of conditional expression (4), it becomes difficult to correct fluctuations of various aberrations during zooming, especially fluctuations such as distortion.
【００９８】条件式（５）は条件式（４）と組み合わせ
て第１群の形状と適切とするものであり、第１群の焦点
距離に対する第１群の物体側から３番目のレンズ面の曲
率半径の割合を規定するものである。Conditional expression (5) is combined with conditional expression (4) to make the shape of the first lens unit appropriate, and the third lens surface of the first lens unit from the object side with respect to the focal length of the first lens unit. This defines the ratio of the radius of curvature.
【００９９】条件式（５）の下限値を越えて曲率半径が
きつくなると（４）式の条件を満足する構成としたとき
に、第１群を構成する各レンズ面の曲率半径をそれぞれ
きつくしなければならなくなって、所定の開放Ｆ値のレ
ンズを構成するための第１群の全長を長くすることが必
要となってコンパクト化、軽量化に適さなくなる。又、
ズーミングの際の諸収差、特に非点収差や歪曲の補正も
困難となる。又物体側から３番目のレンズ面の曲率中心
位置が、このレンズ面より物体側となってメニスカス形
状でなくなると、第１群の屈折力を適切に保ったまま第
１群の３次の球面収差係数を小さく補正することが困難
となる。When the radius of curvature exceeds the lower limit value of the conditional expression (5), the radius of curvature of each lens surface constituting the first lens unit becomes tight when the configuration satisfies the condition of the expression (4). Therefore, it is necessary to increase the total length of the first unit for forming a lens having a predetermined open F-number, which is not suitable for downsizing and weight reduction. or,
It is also difficult to correct various aberrations during zooming, particularly astigmatism and distortion. If the center of curvature of the third lens surface from the object side is closer to the object side than this lens surface and no longer has a meniscus shape, the first group's tertiary spherical surface is maintained while the refractive power of the first group is appropriately maintained. It becomes difficult to correct the aberration coefficient to a small value.
【０１００】本発明では以上説明したように、条件式
（４）及び条件式（５）によって第１群の各レンズ面の
形状を適切に設定することにより、主として第１群の３
次の球面収差係数を小さく補正することにより、同時に
３次のコマ収差係数をも小さく補正し、その結果第２群
の収差係数が小さい値で十分となるように設定して、主
として偏心コマ収差を良好に補正することに成功してい
る。As described above, in the present invention, by appropriately setting the shape of each lens surface of the first lens unit according to the conditional expressions (4) and (5), it is possible to mainly obtain the third lens unit of the first lens unit.
By correcting the next spherical aberration coefficient to be small, the third-order coma aberration coefficient is also corrected to be small at the same time. As a result, the aberration coefficient of the second group is set so that a small value is sufficient. Has been successfully corrected.
【０１０１】次に本発明において第２群を光軸と垂直方
向に平行偏心させると共に光軸上の一点を回転中心とし
て回転させることにより撮影画像のブレを補正する光学
的効果について説明する。Next, the optical effect of correcting the blurring of the photographed image by decentering the second lens unit in the direction perpendicular to the optical axis and rotating the second lens unit about one point on the optical axis in the present invention will be described.
【０１０２】本発明に係る変倍光学系では、変倍及び像
面位置の補正のためにレンズ群が光軸上を移動する。そ
のため、一般に近軸光線の換算傾角α，αａや入射高
ｈ，ｈａは変倍状態に応じて変化する。従って上述のよ
うに変倍光学系の一部のレンズ群を光軸と垂直な方向に
移動させて振動を補償する構成では変倍状態に応じて偏
心収差の発生量が移動する。In the zoom optical system according to the present invention, the lens group moves on the optical axis for zooming and correcting the image plane position. Therefore, in general, the converted inclination angles α and αa and the incident heights h and ha of the paraxial rays change according to the zoom state. Therefore, as described above, in a configuration in which a part of the lens units of the variable power optical system is moved in a direction perpendicular to the optical axis to compensate for vibration, the amount of eccentric aberration generated moves according to the variable power state.
【０１０３】そこでこの偏心収差の変動を見込んで、変
倍状態に応じて所定量だけ残存させたり、あるいは振動
補償の効果が顕著となる望遠端を重視した収差補正を行
なったりすることが設計手法として考えられる。Therefore, in consideration of the fluctuation of the eccentric aberration, it is a design method to leave a predetermined amount in accordance with the magnification change state, or to perform aberration correction focusing on the telephoto end where the effect of vibration compensation is remarkable. It is considered as.
【０１０４】本発明では光軸と垂直な方向に移動させた
レンズ群をそのレンズ群の内部あるいは近傍に存在する
そのレンズ群の光軸上の一点を回転中心として微少回転
させることによって偏心収差の補正のための自由度を増
し、各変倍状態における偏心収差の発生そのものを小さ
く補正している。In the present invention, the lens group moved in the direction perpendicular to the optical axis is slightly rotated about a point on the optical axis of the lens group located inside or near the lens group as a center of rotation, thereby reducing the eccentric aberration. The degree of freedom for correction is increased, and the occurrence of eccentric aberration itself in each zoom state is corrected to be small.
【０１０５】一般に光学系の一部のレンズ群を所定の回
転中心を中心として回転させた場合の偏心収差の発生に
ついても、収差論的な立場より、前述の平行偏心の場合
と同様に示されている。In general, the occurrence of eccentric aberration when a part of the lens group of the optical system is rotated about a predetermined center of rotation is shown in the same manner as in the case of the parallel eccentricity from the viewpoint of aberration theory. ing.
【０１０６】本発明はこのように、偏心収差が回転によ
っても発生するという点に着目し、平行偏心させたレン
ズ群を微少回転させることによって残存する偏心収差を
良好に補正している。The present invention pays attention to the fact that the eccentric aberration is also generated by the rotation, and satisfactorily corrects the remaining eccentric aberration by slightly rotating the parallel eccentric lens group.
【０１０７】本発明は、平行偏心させたレンズ群の微少
回転の回転量を変倍光学系の変倍状態と平行偏心の移動
量に基づいて決定する構成とし、それぞれの状態に応じ
て偏心収差の発生を十分に小さく補正している。The present invention has a configuration in which the rotation amount of the minute rotation of the parallel-eccentric lens group is determined based on the zooming state of the variable-magnification optical system and the moving amount of the parallel eccentricity, and the eccentric aberration according to each state. Is corrected to be sufficiently small.
【０１０８】前述した図１、図２の数値実施例１，２で
は望遠型のズームレンズへの適用例を示したが、それは
前述のように振動補償効果が最も顕著となる場合を想定
して具現化したからであり、本発明の技術思想はこの他
の構成の変倍光学系、即ち例えば標準ズームレンズや、
多群高変倍比のズームレンズ等にも良好に適用すること
が可能である。In the numerical examples 1 and 2 in FIGS. 1 and 2 described above, an example of application to a telephoto zoom lens has been described. However, it is assumed that the vibration compensation effect is most remarkable as described above. This is because it was embodied, and the technical idea of the present invention is a variable power optical system having another configuration, that is, for example, a standard zoom lens,
The present invention can be favorably applied to a zoom lens having a multi-unit high zoom ratio.
【０１０９】又、本発明の微少回転の回転量は、望まし
くは変倍光学系の変倍状態と平行偏心の駆動量に応じて
決定する構成とすべきであるが、制御装置の簡略化を目
的として例えば中間焦点距離領域の場合にのみ所定量だ
け回転させるといった構成とし、望遠端及び広角端とそ
の近傍領域では平行偏心駆動のみとすると共にこの際に
最適となる光学設計を行うという手法も可能である。The rotation amount of the minute rotation according to the present invention should desirably be determined in accordance with the variable power state of the variable power optical system and the parallel eccentric drive amount. For the purpose, for example, it is possible to rotate only a predetermined amount only in the intermediate focal length region, and to perform only parallel eccentric driving at the telephoto end and the wide angle end and in the vicinity thereof, and to perform an optimal optical design at this time. It is possible.
【０１１０】次に本発明の数値実施例を示す。数値実施
例においてＲｉは物体側より順に第ｉ番目のレンズ面の
曲率半径、Ｄｉは物体側より第ｉ番目のレンズ厚及び空
気間隔、Ｎｉとνｉは各々物体側より順に第ｉ番目のレ
ンズのガラスの屈折率とアッベ数である。 （数値実施例１） R 1= 105.37 D 1= 2.90 N 1=1.80518 ν 1= 25.4 R 2= 69.27 D 2= 6.60 N 2=1.51633 ν 2= 64.2 R 3= 581.08 D 3= 0.20 R 4= 118.03 D 4= 4.90 N 3=1.48749 ν 3= 70.2 R 5=-735.89 D 5= 可変 R 6=-181.07 D 6= 1.50 N 4=1.77250 ν 4= 49.6 R 7= 81.75 D 7= 5.74 R 8= -75.27 D 8= 1.52 N 5=1.77250 ν 5= 49.6 R 9= 40.31 D 9= 4.49 N 6=1.84666 ν 6= 23.9 R10= 350.97 D10= 可変 R11= 105.09 D11= 7.10 N 7=1.51742 ν 7= 52.4 R12= -31.61 D12= 2.10 N 8=1.80518 ν 8= 25.4 R13= -56.36 D13= 可変 R14=（絞り） D14= 1.90 R15= 24.86 D15= 8.59 N 9=1.60311 ν 9= 60.7 R16=-308.92 D16= 1.52 N10=1.77250 ν10= 49.6 R17= 78.19 D17= 1.16 R18= 41.85 D18= 1.94 N11=1.83400 ν11= 37.2 R19= 16.18 D19= 7.02 N12=1.60729 ν12= 49.2 R20= 54.86 D20= 4.52 R21=1381.43 D21= 3.51 N13=1.60342 ν13= 38.0 R22= -55.75 D22= 6.41 R23= -20.70 D23= 1.68 N14=1.80400 ν14= 46.6 R24= 29.79 D24= 5.30 N15=1.61293 ν15= 37.0 R25= -38.91 Next, numerical examples of the present invention will be described. In the numerical examples, Ri is the radius of curvature of the i-th lens surface in order from the object side, Di is the i-th lens thickness and air spacing from the object side, and Ni and νi are the i-th lens surfaces in order from the object side. The refractive index and Abbe number of glass. (Numerical Example 1) R 1 = 105.37 D 1 = 2.90 N 1 = 1.80518 ν 1 = 25.4 R 2 = 69.27 D 2 = 6.60 N 2 = 1.51633 ν 2 = 64.2 R 3 = 581.08 D 3 = 0.20 R 4 = 118.03 D 4 = 4.90 N 3 = 1.48749 ν 3 = 70.2 R 5 = -735.89 D 5 = Variable R 6 = -181.07 D 6 = 1.50 N 4 = 1.77250 ν 4 = 49.6 R 7 = 81.75 D 7 = 5.74 R 8 =- 75.27 D 8 = 1.52 N 5 = 1.77250 ν 5 = 49.6 R 9 = 40.31 D 9 = 4.49 N 6 = 1.84666 ν 6 = 23.9 R10 = 350.97 D10 = Variable R11 = 105.09 D11 = 7.10 N 7 = 1.51742 ν 7 = 52.4 R12 = -31.61 D12 = 2.10 N 8 = 1.80518 ν 8 = 25.4 R13 = -56.36 D13 = Variable R14 = (Aperture) D14 = 1.90 R15 = 24.86 D15 = 8.59 N 9 = 1.60311 ν 9 = 60.7 R16 = -308.92 D16 = 1.52 N10 = 1.77250 ν10 = 49.6 R17 = 78.19 D17 = 1.16 R18 = 41.85 D18 = 1.94 N11 = 1.83400 ν11 = 37.2 R19 = 16.18 D19 = 7.02 N12 = 1.60729 ν12 = 49.2 R20 = 54.86 D20 = 4.52 R21 = 1381.43 D21 = 3.51 N13 = 1.60342 ν13 = 38.0 R22 = -55.75 D22 = 6.41 R23 = -20.70 D23 = 1.68 N14 = 1.80400 ν14 = 46.6 R24 = 29.79 D24 = 5.30 N15 = 1.61293 ν15 = 37.0 R25 = -38.91
【０１１１】[0111]
【表２】 φ１／φＴ ＝ ２．１５ φＴ１，２／φＴ＝−１．６３ Ｐ３，４ ＝ ２．８０ Ｒ１，１／Ｆ１ ＝ ０．７８ Ｒ１，３／Ｆ１ ＝ ４．２４ （数値実施例２） R 1= 134.24 D 1= 3.00 N 1=1.80518 ν 1= 25.4 R 2= 80.34 D 2= 7.80 N 2=1.51633 ν 2= 64.2 R 3= 1510.74 D 3= 0.20 R 4= 91.47 D 4= 7.10 N 3=1.48749 ν 3= 70.2 R 5=-5065.33 D 5= 可変 R 6= -212.80 D 6= 1.50 N 4=1.77250 ν 4= 49.6 R 7= 47.77 D 7= 5.92 R 8= -46.22 D 8= 1.50 N 5=1.69680 ν 5= 55.5 R 9= 53.50 D 9= 3.60 N 6=1.84666 ν 6= 23.8 R10= -282.77 D10= 可変 R11= 75.35 D11= 5.80 N 7=1.56444 ν 7= 43.8 R12= -28.08 D12= 1.50 N 8=1.80518 ν 8= 25.4 R13= -59.47 D13= 可変 R14=（絞り） D14= 1.00 R15= 47.39 D15= 6.00 N 9=1.60311 ν 9= 60.7 R16= -40.76 D16= 0.90 R17= -40.84 D17= 1.50 N10=1.83400 ν10= 37.2 R18= -369.86 D18= 0.20 R19= 35.96 D19= 2.60 N11=1.48749 ν11= 70.2 R20= 69.87 D20= 3.19 R21= 129.52 D21= 2.80 N12=1.60311 ν12= 60.7 R22= -110.56 D22= 0.20 R23= 76.24 D23= 2.00 N13=1.53256 ν13= 45.9 R24= 21.14 D24= 1.78 R25= 59.07 D25= 4.60 N14=1.59551 ν14= 39.2 R26= -20.18 D26= 1.30 N15=1.77250 ν15= 49.6 R27= 70.55 [Table 2] φ1 / φT = 2.15 φT1,2 / φT = −1.63 P3,4 = 2.80 R1,1 / F1 = 0.78 R1,3 / F1 = 4.24 (Numerical Example 2) R 1 = 134.24 D 1 = 3.00 N 1 = 1.80518 ν 1 = 25.4 R 2 = 80.34 D 2 = 7.80 N 2 = 1.51633 ν 2 = 64.2 R 3 = 1510.74 D 3 = 0.20 R 4 = 91.47 D 4 = 7.10 N 3 = 1.48749 ν 3 = 70.2 R 5 = -5065.33 D 5 = Variable R 6 = -212.80 D 6 = 1.50 N 4 = 1.77250 ν 4 = 49.6 R 7 = 47.77 D 7 = 5.92 R 8 = -46.22 D 8 = 1.50 N 5 = 1.69680 ν 5 = 55.5 R 9 = 53.50 D 9 = 3.60 N 6 = 1.84666 ν 6 = 23.8 R10 = -282.77 D10 = Variable R11 = 75.35 D11 = 5.80 N 7 = 1.56444 ν 7 = 43.8 R12 = -28.08 D12 = 1.50 N 8 = 1.80518 ν 8 = 25.4 R13 = -59.47 D13 = Variable R14 = (Aperture) D14 = 1.00 R15 = 47.39 D15 = 6.00 N 9 = 1.60311 ν 9 = 60.7 R16 = -40.76 D16 = 0.90 R17 = -40.84 D17 = 1.50 N10 = 1.83400 ν10 = 37.2 R18 = -369.86 D18 = 0.20 R19 = 35.96 D19 = 2.60 N11 = 1.48749 ν11 = 70.2 R20 = 69.87 D20 = 3.19 R21 = 129.52 D21 = 2.80 N12 = 1.60311 ν12 = 60.7 R22 = -110.56 D22 = 0.20 R23 = 76.24 D23 = 2.00 N13 = 1 .53256 ν13 = 45.9 R24 = 21.14 D24 = 1.78 R25 = 59.07 D25 = 4.60 N14 = 1.59551 ν14 = 39.2 R26 = -20.18 D26 = 1.30 N15 = 1.77250 ν15 = 49.6 R27 = 70.55
【０１１２】[0112]
【表３】 φ１／φＴ ＝ ２．１７ φＴ１，２／φＴ＝−１．４８ Ｐ３，４ ＝ ３．６３ Ｒ１，１／Ｆ１ ＝ ０．９９ Ｒ１，３／Ｆ１ ＝１１．１８[Table 3] φ1 / φT = 2.17 φT1,2 / φT = −1.48 P3,4 = 3.63 R1,1 / F1 = 0.99 R1,3 / F1 = 11.18
【０１１３】[0113]
【発明の効果】本発明によれば前述の構成の変倍光学系
において、第２群を光軸と垂直方向に平行偏心又はそれ
と共に光軸上の一点を回転中心として回転偏心させるこ
とにより画像のブレを補正すると共に、偏心に伴う偏心
収差の発生量を極力押さえた高い光学性能を維持するこ
とのできる防振機能を有した変倍光学系を達成すること
ができる。According to the present invention, in the variable power optical system having the above-described configuration, the second group is decentered in parallel with the optical axis in a direction perpendicular to the optical axis, or is rotated and decentered with one point on the optical axis as the rotation center. And a variable power optical system having an image stabilizing function capable of maintaining high optical performance while minimizing the amount of eccentric aberration caused by eccentricity.
【図１】 本発明の数値実施例１のレンズ断面図FIG. 1 is a sectional view of a lens according to a numerical example 1 of the present invention.
【図２】 本発明の数値実施例２のレンズ断面図FIG. 2 is a sectional view of a lens according to a numerical example 2 of the present invention.
【図３】 本発明の数値実施例１の広角端の収差図FIG. 3 is an aberration diagram at a wide-angle end according to Numerical Embodiment 1 of the present invention.
【図４】 本発明の数値実施例１の中間の収差図FIG. 4 is an intermediate aberration diagram of the numerical example 1 of the present invention.
【図５】 本発明の数値実施例１の望遠端の収差図FIG. 5 is an aberration diagram at a telephoto end in Numerical Example 1 of the present invention;
【図６】 本発明の数値実施例２の広角端の収差図FIG. 6 is an aberration diagram at a wide angle end according to Numerical Example 2 of the present invention.
【図７】 本発明の数値実施例２の中間の収差図FIG. 7 is an intermediate aberration diagram of the numerical example 2 of the present invention.
【図８】 本発明の数値実施例２の望遠端の収差図FIG. 8 is an aberration diagram at a telephoto end in Numerical Example 2 of the present invention.
【図９】 本発明において偏心収差補正を説明する
為のレンズ構成の模式図FIG. 9 is a schematic diagram of a lens configuration for explaining decentering aberration correction in the present invention.
【図１０】 本発明において偏心収差補正を説明する
為のレンズ構成の模式図FIG. 10 is a schematic diagram of a lens configuration for explaining decentering aberration correction in the present invention.
Ｌ１ 第１群 Ｌ２ 第２群 Ｌ３ 第３群 Ｌ４ 第４群 ＳＰ 絞り ｈ 像高 L1 First group L2 Second group L3 Third group L4 Fourth group SP Aperture h Image height
Claims (3)
の屈折力の第２群、正の屈折力の第３群そして正の屈折
力の第４群の４つのレンズ群を有し、広角端から望遠端
への変倍を該第１群と第２群との間隔を増加させて行
い、かつ変倍に伴う像面変動を該第３群を光軸上移動さ
せて補正し、該第２群を光軸と垂直方向に移動させて撮
影画像のブレを補正すると共に、該第１群の屈折力をφ
１、望遠端における全系の屈折力をφＴ、望遠端におけ
る該第１群と第２群の合成屈折力をφＴ１，２、望遠端
における全系の屈折力を１に正規化したときの該第３群
のペッツバール和と第４群のペッツバール和との合計を
Ｐ３，４としたとき なる条件を満足することを特徴とする防振機能を有した
変倍光学系。1. A first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. Zooming from the wide-angle end to the telephoto end by increasing the distance between the first lens unit and the second lens unit, and moving the third lens unit along the optical axis to change the image plane due to zooming. The second group is moved in the direction perpendicular to the optical axis to correct the blur of the captured image, and the refractive power of the first group is
1. When the refractive power of the entire system at the telephoto end is φT, the combined refractive power of the first and second units at the telephoto end is φT1,2, and the refractive power of the entire system at the telephoto end is normalized to 1. When the sum of Petzval sum of the third group and Petzval sum of the fourth group is P3,4 A variable power optical system having a vibration proof function characterized by satisfying the following conditions.
面を向けたメニスカス状の負の第１１レンズと物体側に
凸面を向けたメニスカス状の正の第１２レンズとを貼り
合わせた接合レンズそして正の第１３レンズの３つのレ
ンズより成り、該第１群の第ｉ番目のレンズ面の曲率半
径をＲ１，ｉ、該第１群の焦点距離をＦ１としたとき ０．６＜Ｒ１，１／Ｆ１＜１．２ ３．０＜Ｒ１，３／Ｆ１ なる条件を満足することを特徴とする請求項１の防振機
能を有した変倍光学系。2. In the order from the object side, the first group includes a meniscus negative eleventh lens having a convex surface facing the object side and a meniscus positive twelfth lens having a convex surface facing the object side. When the radius of curvature of the i-th lens surface of the first group is R1, i, and the focal length of the first group is F1, 0.6 << 2. The variable power optical system according to claim 1, wherein a condition of R1, 1 / F1 <1.2 3.0 <R1, 3 / F1 is satisfied.
の屈折力の第２群、正の屈折力の第３群そして正の屈折
力の第４群の４つのレンズ群を有し、広角端から望遠端
への変倍を該第１群と第２群との間隔を増加させて行
い、かつ変倍に伴う像面変動を該第３群を光軸上移動さ
せて補正し、該第２群を光軸と垂直方向に移動させると
共に該第２群の内部又は近傍の光軸上の一点を回転中心
として微小回転させることにより撮影画像のブレを補正
しており、該第１群の屈折力をφ１、望遠端における全
系の屈折力をφＴ、望遠端における該第１群と該第２群
の合成屈折力をφＴ１，２、望遠端における全系の屈折
力を１に正規化したときの該第３群のペッツバール和と
該第４群のペッツバール和との合計をＰ３，４としたと
き なる条件を満足することを特徴とする防振機能を有した
変倍光学系。3. A lens unit comprising a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. Zooming from the wide-angle end to the telephoto end by increasing the distance between the first lens unit and the second lens unit, and moving the third lens unit along the optical axis to change the image plane due to zooming. Correction, moving the second group in a direction perpendicular to the optical axis, and correcting the blur of the captured image by minutely rotating around a point on the optical axis in or near the second group, The refractive power of the first group is φ1, the refractive power of the whole system at the telephoto end is φT, the combined refractive power of the first and second groups at the telephoto end is φT1,2, and the refractive power of the whole system at the telephoto end is When the sum of the Petzval sum of the third group and the Petzval sum of the fourth group when P is normalized to 1 is P3,4 A variable power optical system having a vibration proof function characterized by satisfying the following conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4069447A JP3003370B2 (en) | 1992-02-18 | 1992-02-18 | Variable power optical system with anti-vibration function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4069447A JP3003370B2 (en) | 1992-02-18 | 1992-02-18 | Variable power optical system with anti-vibration function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05232410A JPH05232410A (en) | 1993-09-10 |
| JP3003370B2 true JP3003370B2 (en) | 2000-01-24 |
Family
ID=13402904
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4069447A Expired - Fee Related JP3003370B2 (en) | 1992-02-18 | 1992-02-18 | Variable power optical system with anti-vibration function |
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| Country | Link |
|---|---|
| JP (1) | JP3003370B2 (en) |
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