JP2998434B2 - Variable power optical system with anti-vibration function - Google Patents

Variable power optical system with anti-vibration function

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Publication number
JP2998434B2
JP2998434B2 JP4186185A JP18618592A JP2998434B2 JP 2998434 B2 JP2998434 B2 JP 2998434B2 JP 4186185 A JP4186185 A JP 4186185A JP 18618592 A JP18618592 A JP 18618592A JP 2998434 B2 JP2998434 B2 JP 2998434B2
Authority
JP
Japan
Prior art keywords
lens
optical
image
variable
fixed
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
Application number
JP4186185A
Other languages
Japanese (ja)
Other versions
JPH063626A (en
Inventor
博之 浜野
Original Assignee
キヤノン株式会社
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Filing date
Publication date
Application filed by キヤノン株式会社 filed Critical キヤノン株式会社
Priority to JP4186185A priority Critical patent/JP2998434B2/en
Publication of JPH063626A publication Critical patent/JPH063626A/en
Priority claimed from US08/338,211 external-priority patent/US5521758A/en
Application granted granted Critical
Publication of JP2998434B2 publication Critical patent/JP2998434B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646Imaging 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
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical 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
    • G02B15/144Optical 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
    • G02B15/1441Optical 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
    • G02B15/144113Optical 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 +-++

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【産業上の利用分野】本発明は防振機能を有した変倍光
学系に関し、特に変倍光学系の一部のレンズ群を光軸上
の一点を中心点として回動させることにより、該変倍光
学系が振動(傾動)したときの撮影画像のブレを光学的
に補正して静止画像を得るようにし撮影画像の安定化を
図った写真用カメラやビデオカメラ等に好適な防振機能
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 power optical system having an image stabilizing function, and more particularly to a variable power optical system in which a part of a lens group of the variable power optical system is rotated about a point on an optical axis as a center point. An image stabilizing function suitable for a photographic camera, a video camera, or the like that stabilizes a captured image by optically correcting a blur of the captured image when the variable power optical system vibrates (tilts) to obtain a still image. 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種々と提案されている。
Conventionally, various anti-vibration optical systems having a function of preventing blurring of a captured image have been proposed.
【0004】例えば特公昭56−21133号公報では
光学装置に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。
For example, in Japanese Patent Publication No. 56-21133, some optical members are moved in a direction to cancel the vibrational displacement of an image due to vibration in response to an output signal from a detecting means for detecting a vibration state in an optical device. This stabilizes the image.
【0005】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.
【0006】特公昭56−34847号公報、特公昭5
7−7414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。
Japanese Patent Publication No. 56-34847, Japanese Patent Publication No. 5
In JP-A-7-7414, an optical member spatially fixed to vibration is arranged 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. A still image is obtained on the image plane.
【0007】又、特開昭50−137555号公報では
望遠レンズにおいて物体側のレンズ群をその主点位置か
ら該レンズ群の焦点距離だけ離れた光軸上の点を中心点
にして回動させることにより、該望遠レンズが傾動した
ときの撮影画像のブレを補正している。
Japanese Patent Application Laid-Open No. 50-137555 discloses a telephoto lens in which a lens group on the object side is rotated about a point on the optical axis which is separated from the principal point by the focal length of the lens group as a center point. This corrects the blur of the captured image when the telephoto lens is tilted.
【0008】特開昭63−115126号公報では加速
度センサー等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。
In Japanese Patent Application Laid-Open No. 63-115126, vibration of a photographing system is detected by using an acceleration sensor or the like, and a part of the lens group of the photographing system is moved in a direction orthogonal to the optical axis according to a signal obtained at this time. There is also a method of obtaining a still image by vibrating the image.
【0009】この他、特開平2−238429号公報や
米国特許第2959088号では負と正の屈折力の第1
群と第2群の2つのレンズ群より成るレンズ系を撮影系
の前方に配置し、撮影系が振動したとき、該第2群を防
振用の稼動レンズ群とし、その焦点位置でジンバル支持
した慣性振り子方式を利用した防振光学系を提案してい
る。
In addition, Japanese Patent Application Laid-Open No. Hei 2-238429 and US Pat. No. 2,959,088 disclose the first and second refractive powers of negative and positive.
A lens system consisting of two lens groups, a group and a second group, is arranged in front of the photographing system, and when the photographing system vibrates, the second group is used as an active lens group for image stabilization, and a gimbal support is provided at its focal position. We have proposed an anti-vibration optical system using the inertial pendulum method.
【0010】[0010]
【発明が解決しようとする課題】一般に防振光学系を撮
影系の前方に配置し、該防振光学系の一部の可動レンズ
群を振動させて撮影画像のブレを無くし静止画像を得る
方法は、装置全体が大型化し、かつ該可動レンズ群を移
動させる為の移動機構が複雑化してくるという問題点が
あった。
Generally, a method of disposing an image stabilizing optical system in front of a photographing system and vibrating a part of a movable lens group of the image stabilizing optical system to eliminate blurring of a photographed image and obtain a still image. However, there is a problem that the entire apparatus becomes large and a moving mechanism for moving the movable lens group becomes complicated.
【0011】又、可動レンズ群を振動させたときの偏心
収差の発生量が多くなり光学性能が大きく低下してくる
という問題点もあった。
There is also a problem that the amount of decentering aberration generated when the movable lens group is vibrated increases, and the optical performance is greatly reduced.
【0012】可変頂角プリズムを利用して防振を行なう
光学系では特に長焦点距離側(望遠側)において防振時
に偏心倍率色収差の発生量が多くなるという問題点があ
った。
An optical system that performs image stabilization using a variable apex angle prism has a problem that the amount of chromatic aberration of eccentric magnification increases during image stabilization, especially on the long focal length side (telephoto side).
【0013】一方、撮影系の一部のレンズを光軸に対し
て垂直方向に平行偏心させて防振を行なう光学系におい
ては、防振の為に特別な光学系は要しないという利点は
あるが、その反面防振時における偏心収差の発生量が多
くなってくるという問題点があった。
On the other hand, an optical system that performs image stabilization by decentering some lenses of the photographing system in a direction perpendicular to the optical axis has the advantage that no special optical system is required for image stabilization. However, on the other hand, there is a problem that the amount of occurrence of eccentric aberration at the time of image stabilization increases.
【0014】又、防振時において必要な光量を撮像面上
で確保する為に可動レンズ群より物体側のレンズ群のレ
ンズ径を大きくしなければならず、この為装置全体が大
型化しくるという問題点があった。
In addition, in order to secure a necessary light amount on the imaging surface during image stabilization, it is necessary to increase the lens diameter of the lens group on the object side with respect to the movable lens group. There was a problem.
【0015】更に変倍レンズ群(変倍部)以降の少なく
とも1つのレンズ群を振動させて防振を行なう光学系に
おいては、撮影画像のブレの補正量と可動レンズ群の移
動量との関係が変倍位置により異なり複雑となり、それ
らの値を求めるには演算回路等の演算手段が必要とな
り、装置全体が複雑化かつ高コスト化になってくるとい
う問題点があった。
Further, in an optical system which performs vibration reduction by vibrating at least one lens unit after the variable power lens unit (magnification unit), the relationship between the amount of correction of blurring of the photographed image and the amount of movement of the movable lens unit. However, there is a problem that arithmetic means such as an arithmetic circuit is required to obtain these values, and the entire apparatus becomes complicated and costly.
【0016】又、変倍時にバリエータ等の移動するレン
ズ群を利用して防振を行なうとすると、その構造が大変
複雑となり、かつレンズ群を移動させる為の駆動手段と
してのズームモータ等にかかる負荷が大きくなってくる
という問題点があった。
If image stabilization is performed using a moving lens group such as a variator at the time of zooming, the structure becomes very complicated, and a zoom motor or the like as driving means for moving the lens group is required. There was a problem that the load increased.
【0017】本発明は変倍光学系の一部を構成するレン
ズ群を光軸上の一転を回転中心にして回動させて、該変
倍光学系が振動(傾動)したときの画像のブレを補正す
るように構成することにより、装置全体の小型化を図り
つつ該レンズ群を偏心させたときの偏心収差の発生量を
少なく抑え、偏心収差を良好に補正した防振機能を有し
た変倍光学系の提供を目的とする。
According to the present invention, an image blur when the variable power optical system is vibrated (tilted) is rotated by rotating a lens group constituting a part of the variable power optical system around a rotation on the optical axis. A configuration having an image stabilizing function that satisfactorily corrects eccentric aberration while suppressing the amount of eccentric aberration generated when the lens group is decentered, while reducing the size of the entire apparatus, by reducing the size of the entire apparatus. The objective is to provide a magnification optical system.
【0018】[0018]
【課題を解決するための手段】本発明の防振機能を有し
た変倍光学系は、変倍部より物体側に変倍及び合焦の際
に固定の第1群を設けた変倍光学系であって、該第1群
は固定の第1a群と光軸上の一点を回転中心にして回動
して像ブレを補正する第1b群とを有し、該第1a群中
の少なくとも1つのレンズ面は中心部から周辺部にいく
に従い正の屈折力が強くなる形状の非球面より成り、第
1b群の焦点距離をf1b、該第1b群の後側主点から
該回転中心までの距離をL、望遠端における全系の焦点
距離をfTとしたとき 0.5 <|f1b/L| <1.2 ‥‥‥‥‥‥‥(1) 0.53<|f1b/fT|<0.65 ‥‥‥‥‥‥‥(2) なる条件を満足することを特徴としている。
According to the present invention, a variable power optical system having an image stabilizing function includes a variable power optical system having a first group fixed at the time of zooming and focusing on the object side of a variable power unit. A first group having a fixed first group and a first group that rotates around a point on the optical axis to correct image blur, and includes at least one of the first group. One lens surface is formed of an aspheric surface having a shape in which the positive refractive power becomes stronger from the center to the periphery. The focal length of the first lens unit is f1b, and the rear principal point of the first lens unit to the rotation center is Where L is the distance and fT is the focal length of the entire system at the telephoto end. 0.5 <| f1b / L | <1.2 ‥‥‥‥‥‥‥ (1) 0.53 <| f1b / fT | <0.65 ‥‥‥‥‥‥‥ (2)
【0019】特に前記変倍光学系は物体側より順に変倍
及び合焦の際に固定の正の屈折力の第1群、変倍機能を
有する負の屈折力の第2群、固定の正の屈折力の第3
群、そして変倍により変動する像面を補正する補正機能
と合焦機能の双方の機能を有する正の屈折力の第4群の
4つのレンズ群を有していることを特徴としている。
In particular, the variable power optical system includes, in order from the object side, a first group having a fixed positive refractive power, a second group having a negative refractive power having a zooming function, and a fixed positive lens during focusing and focusing. The third of the refractive power of
The zoom lens is characterized by having four lens groups of a fourth group having a positive refractive power and having both a correction function for correcting an image plane that fluctuates due to zooming and a focusing function.
【0020】[0020]
【実施例】図1は本発明の実施例1の光学系の近軸屈折
力配置を示す概略図、図2は本発明の数値実施例1のレ
ンズ断面図である。
FIG. 1 is a schematic view showing a paraxial refractive power arrangement of an optical system according to Embodiment 1 of the present invention, and FIG. 2 is a lens sectional view of Numerical Embodiment 1 of the present invention.
【0021】図3、図4、図5、図6、図7は本発明の
数値実施例1の広角端、中間、望遠端、偏心なしの望遠
端、そして2度のブレ角を補正した望遠端の収差図、図
8、図9、図10、図11、図12は本発明の数値実施
例2の広角端、中間、望遠端、偏心なしの望遠端、そし
て2度のブレ角を補正した望遠端の収差図、図13、図
14、図15、図16、図17は本発明の数値実施例3
の広角端、中間、望遠端、偏心なしの望遠端、そして2
度のブレ角を補正した望遠端の収差図である。
FIGS. 3, 4, 5, 6, and 7 show the telephoto end corrected for the wide-angle end, the middle, the telephoto end, the telephoto end without eccentricity, and the 2 degree blur angle in the first numerical embodiment of the present invention. 8, 9, 10, 11, and 12 correct the wide-angle end, the middle, the telephoto end, the telephoto end without eccentricity, and the blur angle of 2 degrees in Numerical Embodiment 2 of the present invention. 13, FIG. 14, FIG. 15, FIG. 16, and FIG. 17 show a third embodiment of the present invention.
Wide-angle end, middle, telephoto end, telecentric end without eccentricity, and 2
FIG. 7 is an aberration diagram at a telephoto end in which a degree of blurring is corrected.
【0022】図中1は変倍及び合焦の際に固定の第1群
である。第1群1は固定の第1a群1aと光軸上の一点
を中心にして回動し、像ブレを補正する防振用の第1b
群1b(可動レンズ群)との2つのレンズ群より構成し
ている。第1a群1aの像面側のレンズ面は中心部から
周辺部に向かうに従って正の屈折力が強くなる形状の非
球面より構成している。
In FIG. 1, reference numeral 1 denotes a first lens unit which is fixed during zooming and focusing. The first group 1 is rotated about a fixed point on the optical axis with respect to the fixed first group 1a, and the first group 1b for image stabilization for correcting image blurring.
It is composed of two lens groups, a group 1b (movable lens group). The lens surface on the image plane side of the first lens subunit 1a is formed of an aspherical surface having a positive refractive power that increases from the center to the periphery.
【0023】2は変倍の際、光軸方向に沿って移動する
負の屈折力の第2群であり、変倍部を構成している。第
2群2は例えば矢印aの如く移動させて広角端から望遠
端への変倍を行なっている。
Reference numeral 2 denotes a second unit having a negative refractive power which moves along the optical axis direction during zooming, and constitutes a zooming unit. The second lens unit 2 is moved, for example, as indicated by an arrow a to perform zooming from the wide-angle end to the telephoto end.
【0024】3は固定の正の屈折力の第3群、4は変倍
に伴ない変動する像面を補正する像面補正機能と焦点合
わせを行なう合焦機能との双方の機能を有する正の屈折
力の第4群である。
Reference numeral 3 denotes a third group having a fixed positive refractive power, and reference numeral 4 denotes a positive lens having both an image plane correction function for correcting an image plane that fluctuates with zooming and a focusing function for focusing. Is a fourth group of refractive powers.
【0025】本実施例では第4群4を無限遠物体に焦点
合わせを行なった状態で広角端から望遠端への変倍を行
なう際には曲線bの如く光軸上移動させて行なってい
る。又至近物体に焦点合わせを行なった状態で広角端か
ら望遠端への変倍を行なう際には曲線cの如く光軸上移
動させて行なっている。
In this embodiment, when zooming from the wide-angle end to the telephoto end with the fourth unit 4 focused on an object at infinity, the fourth unit 4 is moved on the optical axis as shown by a curve b. . When zooming from the wide-angle end to the telephoto end while focusing on the closest object, the zoom is performed by moving the optical axis as shown by a curve c.
【0026】本実施例においては第1群1を2つのレン
ズ群1a,1bより構成し、このうち第1b群1bを防
振用として光軸上の特定の点を中心にして回動させて変
倍光学系が振動したときの像ブレを補正している。これ
により従来の防振光学系に比べて防振の為のレンズ群や
可変頂角プリズム等の光学部材を新たに付加することな
く防振を行なっている。
In this embodiment, the first lens unit 1 is composed of two lens units 1a and 1b, and the first lens unit 1b is used for image stabilization by rotating around a specific point on the optical axis. The image blur when the variable magnification optical system vibrates is corrected. As a result, compared to the conventional anti-vibration optical system, anti-vibration is performed without newly adding an optical member such as a lens group or a variable apex prism for anti-vibration.
【0027】又、第1b群1bの物体側に第1b群を偏
心させたときに発生する偏心収差を補正する為の第1a
群1aを設けて防振時に発生する偏心収差、特に偏心コ
マ収差と偏心像面湾曲を良好に補正している。
The first lens unit 1a for correcting eccentric aberration generated when the first lens unit is decentered toward the object side of the first lens unit 1b.
The group 1a is provided to satisfactorily correct eccentric aberrations generated during image stabilization, particularly eccentric coma and eccentric field curvature.
【0028】又、本実施例において変倍光学系の一部を
構成する第1群1はブロック単体で構成している。これ
により第1群1中である程度の色消しを行ない、防振時
の偏心倍率色収差の発生が前述した従来の可変頂角プリ
ズムを使用したときに比べて、より小さくなるようにし
ている。
Further, in this embodiment, the first lens unit 1 constituting a part of the variable power optical system is constituted by a single block. Thus, some achromatization is performed in the first lens unit 1 so that the occurrence of eccentric magnification chromatic aberration during image stabilization is smaller than when the above-described conventional variable apex prism is used.
【0029】本実施例においては、このような4つのレ
ンズ群1〜4で防振機能を有した変倍光学系を構成して
いる。
In this embodiment, a zoom optical system having a vibration-proof function is constituted by the four lens groups 1 to 4.
【0030】そしてレンズ系全体の小型化を図りつつ良
好なる光学性能を得る為に前述の各条件式(1),
(2)を満足させている。
In order to obtain good optical performance while reducing the size of the entire lens system, the above-mentioned conditional expressions (1) and (2) are used.
(2) is satisfied.
【0031】次に前述の各条件式(1),(2)の技術
的意味について説明する。
Next, the technical meaning of each of the conditional expressions (1) and (2) will be described.
【0032】条件式(1)は第1b群1bを回動させる
際の光軸上の回転中心の位置を適切に設定し、防振機能
を効果的に発揮させる為のものである。
Conditional expression (1) is for appropriately setting the position of the center of rotation on the optical axis when rotating the first lens subunit 1b, and effectively exhibiting the vibration proof function.
【0033】条件式(1)の下限値を越えて回転中心が
第1b群1bの後側主点から遠くになりすぎると防振時
に発生する偏心像面湾曲の補正が不十分となってくるの
で良くない。
If the rotation center exceeds the lower limit value of the conditional expression (1) and becomes too far from the rear principal point of the first lens unit 1b, the correction of the eccentric field curvature generated at the time of image stabilization becomes insufficient. Not so good.
【0034】又、条件式(1)の上限値を越えて回転中
心が第1b群1bの後側主点に近づいてくると防振時に
発生する偏心像面湾曲の補正が過剰となり、又偏心コマ
収差の発生量が大きくなりすぎるので良くない。
If the center of rotation approaches the rear principal point of the first lens unit 1b beyond the upper limit value of the conditional expression (1), the correction of the eccentric curvature of field which occurs during image stabilization becomes excessive, and This is not good because the amount of coma aberration is too large.
【0035】条件式(2)は第1b群1bの屈折力を適
切に設定し、主に防振の為に第1b群を偏心させたとき
の偏心収差の発生量を少なくする為のものである。
Conditional expression (2) is for appropriately setting the refractive power of the first lens subunit 1b and reducing the amount of eccentric aberration generated when the first lens subunit 1c is decentered mainly for image stabilization. is there.
【0036】条件式(2)の下限値を越えて第1b群1
bの屈折力が強くなりすぎると偏心収差の発生量を小さ
く抑えることが困難となってくるので良くない。
If the lower limit of conditional expression (2) is exceeded,
If the refractive power of b becomes too strong, it becomes difficult to reduce the amount of decentering aberration generated, which is not good.
【0037】又、条件式(2)の上限値を越えて第1b
群の屈折力が弱くなりすぎると防振時に第1b群の偏心
量が多くなり、この結果第1b群1bのレンズ中心部か
ら光軸までの距離が大きくなりすぎ第1b群1bのレン
ズ径が増大してくるので良くない。
When the value exceeds the upper limit of conditional expression (2), the first
If the refracting power of the group becomes too weak, the amount of eccentricity of the first group b becomes large at the time of image stabilization. As a result, the distance from the lens center of the first group 1b to the optical axis becomes too large and the lens diameter of the first group 1b becomes too large. Not good as it increases.
【0038】本実施例においては防振用の第1b群1b
の物体側に固定の第1a群1aを設けている。そしてこ
の第1a群1aの像面側のレンズ面をレンズ中心部から
周辺部に向かうに従って正の屈折力が強くなるような形
成の非球面より構成している。
In this embodiment, the first group 1b for vibration isolation is used.
Is provided with a fixed first group 1a on the object side. The lens surface on the image plane side of the first lens subunit 1a is formed of an aspherical surface formed such that the positive refractive power increases from the center of the lens toward the periphery.
【0039】このとき該レンズ面の非球面量は同一補正
角に対して第1b群1bの傾き角が大きくなる程、即ち
回動の際、第1b群1bの回転中心が第1a群1aに近
付く程大きくなるように設定している。これにより防振
時の偏心収差、特に偏心コマ収差を良好に補正し、高い
光学性能を維持している。
At this time, the amount of aspherical surface of the lens surface becomes larger as the inclination angle of the first lens unit 1b becomes larger with respect to the same correction angle, that is, at the time of rotation, the center of rotation of the first lens unit 1b becomes the first lens unit 1a. It is set to increase as you approach. As a result, eccentric aberrations, especially eccentric coma aberrations during vibration proofing are favorably corrected, and high optical performance is maintained.
【0040】又、この固定の第1a群1aは外部から直
接変倍光学系へ防振のため以外の外力が加わらないよう
に保護ガラスとしての作用も併せ持っている。
The fixed first lens unit 1a also has a function as a protective glass so that no external force other than vibration reduction is applied directly to the variable power optical system from the outside.
【0041】SSPは固定の絞りであり、第1群1と第
2群2との間に配置している。絞りSSPは防振時にお
ける画面周辺での像面照度比の変化を小さく抑え、これ
により防振時においても適切なる光量分布が撮像面上で
得られるようにしている。
SSP is a fixed stop, which is arranged between the first group 1 and the second group 2. The aperture SSP suppresses a change in the image plane illuminance ratio around the screen during image stabilization, so that an appropriate light amount distribution can be obtained on the imaging surface even during image stabilization.
【0042】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。又、表−1に
各数値実施例における各条件式との関係を示す。
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. Table 1 shows the relationship with each conditional expression in each numerical example.
【0043】尚、数値実施例1,3におけるR23,R
24、数値実施例2におけるR21,R22は各々フェ
ースプレート等のガラス材(平行平面板)である。
Note that R23 and R in Numerical Examples 1 and 3
24, R21 and R22 in Numerical Example 2 are glass materials (parallel plane plates) such as face plates.
【0044】数値実施例1〜3におけるR1,R2は防
振時の偏心収差の補正機能を有する第1a群、R8は防
振時の像面照度比の変化を防止する為の固定絞りSSP
である。
In Numerical Embodiments 1 to 3, R1 and R2 are a first lens unit having a function of correcting eccentric aberration during image stabilization, and R8 is a fixed stop SSP for preventing a change in image plane illuminance ratio during image stabilization.
It is.
【0045】又、非球面形状は光軸方向にX軸、光軸と
垂直方向にh軸、光の進行方向を正としR0 を近軸曲率
半径、B,C,D,Eを各々非球面係数としたとき
The aspheric surface has an X-axis in the optical axis direction, an h-axis in a direction perpendicular to the optical axis, a positive traveling direction of light, R 0 being a paraxial radius of curvature, and B, C, D, and E being aspherical. Spherical coefficient
【0046】[0046]
【数1】 なる式で表わしている。又、例えば「D−0x」の意味
は「10-x」を意味する。 数値実施例 1 f= 1 〜 9.46 fno=1:1.85〜2.60 2ω= 53.2°〜 6.1° R 1= ∞ D 1= 0.2659 N 1=1.58313 ν 1= 59.4 R 2= 非球面 D 2= 0.31 R 3= 5.9024 D 3= 0.2347 N 2=1.80518 ν 2= 25.4 R 4= 3.0011 D 4= 1.0169 N 3=1.62280 ν 3= 57.1 R 5= 19.0117 D 5= 0.0313 R 6= 3.8646 D 6= 0.5632 N 4=1.77250 ν 4= 49.6 R 7= 12.5153 D 7= 0.29 R 8= 固定絞り D 8= 可変 R 9= 10.3513 D 9= 0.1095 N 5=1.77250 ν 5= 49.6 R10= 1.1593 D10= 0.3700 R11= -2.7567 D11= 0.1095 N 6=1.69680 ν 6= 55.5 R12= 1.5665 D12= 0.1721 R13= 1.9293 D13= 0.2659 N 7=1.84666 ν 7= 23.8 R14= 8.9728 D14= 可変 R15= 開口絞り D15= 0.1721 R16= 2.3868 D16= 0.4380 N 8=1.58313 ν 8= 59.4 R17= 非球面 D17= 可変 R18= 2.4818 D18= 0.0939 N 9=1.84666 ν 9= 23.8 R19= 1.2043 D19= 0.4693 N10=1.51633 ν10= 64.2 R20= -10.0064 D20= 0.0235 R21= -55.3935 D21= 0.2659 N11=1.60311 ν11= 60.7 R22= -3.7088 D22= 0.6258 R23= ∞ D23= 0.7822 N12=1.51633 ν12= 64.2 R24= ∞ R2面 非球面 R0 = ∞ K= 0 B=−1.56712D−04 R17面 非球面 R0 = −7.6694 K= 3.25725D+00 B=−5.52222D−02 C=−4.06010D−03 D=−1.53076D−02 E=−6.58462D−03
(Equation 1) It is represented by the following equation. For example, the meaning of "D-0x" means "10- x ". Numerical Example 1 f = 1 to 9.46 fno = 1: 1.85 to 2.60 2ω = 53.2 ° to 6.1 ° R 1 = ∞ D 1 = 0.2659 N 1 = 1.58313 ν 1 = 59.4 R 2 = Aspherical surface D 2 = 0.31 R 3 = 5.9024 D 3 = 0.2347 N 2 = 1.80518 ν 2 = 25.4 R 4 = 3.0011 D 4 = 1.0169 N 3 = 1.62280 ν 3 = 57.1 R 5 = 19.0117 D 5 = 0.0313 R 6 = 3.8646 D 6 = 0.5632 N 4 = 1.77250 ν 4 = 49.6 R 7 = 12.5153 D 7 = 0.29 R 8 = fixed aperture D 8 = variable R 9 = 10.3513 D 9 = 0.1095 N 5 = 1.77250 ν 5 = 49.6 R10 = 1.1593 D10 = 0.3700 R11 = -2.7567 D11 = 0.1095 N 6 = 1.69680 ν 6 = 55.5 R12 = 1.5665 D12 = 0.1721 R13 = 1.9293 D13 = 0.2659 N 7 = 1.84666 ν 7 = 23.8 R14 = 8.9728 D14 = Variable R15 = Aperture stop D15 = 0.1721 R16 = 2.3868 D16 = 0.4380 N 8 = 1.58313 ν 8 = 59.4 R17 = Aspherical surface D17 = Variable R18 = 2.4818 D18 = 0.0939 N 9 = 1.84666 ν 9 = 23.8 R19 = 1.2043 D19 = 0.4693 N10 = 1.51633 ν10 = 64.2 R20 = -10.0064 D20 = 0.0235 R21 = -55.3935 D21 = 0.2659 N11 = 1.60311 ν11 = 60.7 R22 = -3.7088 D22 = 0.6258 R23 = ∞ D23 = 0.7822 N12 = 1.51633 ν12 = 64.2 R24 = ∞ R2 aspherical surface R 0 = ∞ K = 0 B = -1.5671 D-04 R17 aspherical surface R 0 = -7.6694 K = 3.25725D + 00 B = -5.52222D-02 C = -4.06010D-03 D = -1.53076D-02 E = -6.58462D- 03
【0047】[0047]
【表1】 回転中心R3面より 6.629 数値実施例 2 f= 1 〜 7.60 fno=1:2.05〜2.882 2ω= 48.0°〜 6.6° R 1= ∞ D 1= 0.2083 N 1=1.51633 ν 1= 64.2 R 2= 非球面 D 2= 0.28 R 3= 8.6537 D 3= 0.1528 N 2=1.80518 ν 2= 25.4 R 4= 2.6736 D 4= 0.6945 N 3=1.62299 ν 3= 58.2 R 5= -50.9433 D 5= 0.0278 R 6= 2.9458 D 6= 0.4167 N 4=1.80610 ν 4= 41.0 R 7= 9.7227 D 7= 0.22 R 8= 固定絞り D 8= 可変 R 9= 29.9682 D 9= 0.0694 N 5=1.88300 ν 5= 40.8 R10= 0.8233 D10= 0.3123 R11= -0.9646 D11= 0.0694 N 6=1.58144 ν 6= 40.8 R12= 1.3462 D12= 0.2778 N 7=1.84666 ν 7= 23.8 R13= -2.5971 D13= 可変 R14= 開口絞り D14= 0.1667 R15= 非球面 D15= 0.4167 N 8=1.58313 ν 8= 59.4 R16= -11.4523 D16= 可変 R17= 2.8775 D17= 0.0694 N 9=1.84666 ν 9= 23.8 R18= 1.1272 D18= 0.0347 R19= 1.2844 D19= 0.5278 N10=1.58313 ν10= 59.4 R20= 非球面 D20= 1.1112 R21= ∞ D21= 0.7778 N11=1.51633 ν11= 64.2 R22= ∞ R2面 非球面 R0 = ∞ K= 0 B=−5.59792D−04 R15面 非球面 R0 = 1.8533 K=−7.87402D−02 B=−2.81506D−02 C=−2.77357D−02 D= 1.40493D−02 R20面 非球面 R0 =−2.3519 K=0 B= 5.22976D−04 C=−5.07458D−02 D=−2.86992D−02[Table 1] 6.629 from rotation center R3 surface 6.629 Numerical example 2 f = 1 to 7.60 fno = 1: 2.05 to 2.882 2ω = 48.0 ° to 6.6 ° R 1 = ∞ D 1 = 0.2083 N 1 = 1.51633 ν 1 = 64.2 R 2 = Aspherical surface D 2 = 0.28 R 3 = 8.6537 D 3 = 0.1528 N 2 = 1.80518 ν 2 = 25.4 R 4 = 2.6736 D 4 = 0.6945 N 3 = 1.62299 ν 3 = 58.2 R 5 = -50.9433 D 5 = 0.0278 R 6 = 2.9458 D 6 = 0.4167 N 4 = 1.80610 ν 4 = 41.0 R 7 = 9.7227 D 7 = 0.22 R 8 = Fixed diaphragm D 8 = Variable R 9 = 29.9682 D 9 = 0.0694 N 5 = 1.88300 ν 5 = 40.8 R10 = 0.8233 D10 = 0.3123 R11 = -0.9646 D11 = 0.0694 N 6 = 1.58144 ν 6 = 40.8 R12 = 1.3462 D12 = 0.2778 N 7 = 1.84666 ν 7 = 23.8 R13 = -2.5971 D13 = Variable R14 = Aperture stop D14 = 0.1667 R15 = Aspherical surface D15 = 0.4167 N 8 = 1.58313 ν 8 = 59.4 R16 = -11.4523 D16 = Variable R17 = 2.8775 D17 = 0.0694 N 9 = 1.84666 ν 9 = 23.8 R18 = 1.1272 D18 = 0.0347 R19 = 1.2844 D19 = 0.5278 N10 = 1.58313 ν10 = 59.4 R20 = aspheric D20 = 1.1112 R21 = ∞ D21 = 0.7778 N11 = 1.51633 ν11 = 64.2 R22 = ∞ R2 aspherical surface R 0 = ∞ K = 0 B = -5.59792D-04 R15 Aspherical R 0 = 1.8533 K = -7.87402D- 02 B = -2.81506D-02 C = -2.77357D-02 D = 1.40493D-02 R20 aspherical surface R 0 = -2.3519 K = 0 B = 5.22976D-04 C = −5.07458D-02 D = −2.86992D-02
【0048】[0048]
【表2】 回転中心R3面より 5.242 数値実施例 3 f= 1.〜 9.46 fno=1:1.85〜2.60 2ω= 53.2°〜 6.1° R 1= ∞ D 1= 0.2659 N 1=1.58313 ν 1= 59.4 R 2= 非球面 D 2= 0.31 R 3= 6.0147 D 3= 0.2347 N 2=1.80518 ν 2= 25.4 R 4= 3.0324 D 4= 1.0168 N 3=1.62299 ν 3= 58.2 R 5= 19.2651 D 5= 0.0313 R 6= 3.8372 D 6= 0.5632 N 4=1.77250 ν 4= 49.6 R 7= 12.5147 D 7= 0.30 R 8= 固定絞り D 8= 可変 R 9= 10.0075 D 9= 0.1095 N 5=1.77250 ν 5= 49.6 R10= 1.1435 D10= 0.3690 R11= -2.7546 D11= 0.1095 N 6=1.69680 ν 6= 55.5 R12= 1.5688 D12= 0.1721 R13= 1.9369 D13= 0.2659 N 7=1.84666 ν 7= 23.8 R14= 9.5147 D14= 可変 R15= 開口絞り D15= 0.1721 R16= 非球面 D16= 0.4380 N 8=1.58313 ν 8= 59.4 R17= -7.7627 D17= 可変 R18= 2.3759 D18= 0.0939 N 9=1.84666 ν 9= 23.8 R19= 1.1838 D19= 0.4693 N10=1.51633 ν10= 64.2 R20= -16.2041 D20= 0.0235 R21=-208.7752 D21= 0.2659 N11=1.60311 ν11= 60.7 R22= -3.6652 D22= 0.6257 R23= ∞ D23= 0.7822 N12=1.51633 ν12= 64.2 R24= ∞ R2面 非球面 R0 = ∞ K= 0 B=−1.30610D−04 R16面 非球面 R0 = 2.3914 K= 3.28859D+00 B=−5.49762D−02 C=−3.59539D−03 D=−1.55306D−02 E=−7.02882D−03[Table 2] 5.242 from center of rotation R3 5.242 Numerical Example 3 f = 1. to 9.46 fno = 1: 1.85 to 2.60 2ω = 53.2 ° to 6.1 ° R 1 = ∞ D 1 = 0.2659 N 1 = 1.58313 ν 1 = 59.4 R 2 = Aspherical surface D 2 = 0.31 R 3 = 6.0147 D 3 = 0.2347 N 2 = 1.80518 ν 2 = 25.4 R 4 = 3.0324 D 4 = 1.0168 N 3 = 1.62299 ν 3 = 58.2 R 5 = 19.2651 D 5 = 0.0313 R 6 = 3.8372 D 6 = 0.5632 N 4 = 1.77250 ν 4 = 49.6 R 7 = 12.5147 D 7 = 0.30 R 8 = Fixed aperture D 8 = Variable R 9 = 10.0075 D 9 = 0.1095 N 5 = 1.77250 ν 5 = 49.6 R10 = 1.1435 D10 = 0.3690 R11 = -2.7546 D11 = 0.1095 N 6 = 1.69680 ν 6 = 55.5 R12 = 1.5688 D12 = 0.1721 R13 = 1.9369 D13 = 0.2659 N 7 = 1.84666 ν 7 = 23.8 R14 = 9.5147 D14 = Variable R15 = Aperture stop D15 = 0.1721 R16 = Aspheric surface D16 = 0.4380 N 8 = 1.58313 ν 8 = 59.4 R17 = -7.7627 D17 = Variable R18 = 2.3759 D18 = 0.0939 N 9 = 1.84666 ν 9 = 23.8 R19 = 1.1838 D19 = 0.4693 N10 = 1.51633 ν10 = 64.2 R20 = -16.2041 D20 = 0.0235 R21 = -208.7752 D21 = 0.2659 N11 = 1.60311 ν11 = 60.7 R22 = -3.6652 D22 = 0.6257 R23 = ∞ D23 = 0.7822 N12 = 1.51633 ν12 = 64.2 R24 = ∞ R2 aspherical surface R 0 ∞ K = 0 B = -1.30610D- 04 R16 aspherical surface R 0 = 2.3914 K = 3.28859D + 00 B = -5.49762D-02 C = -3.59539D-03 D = -1.55306D- 02 E = -7.02882D-03
【0049】[0049]
【表3】 回転中心R3面より 7.824 [Table 3] 7.824 from surface of rotation center R3
【0050】[0050]
【発明の効果】本発明によれば前述の如く変倍光学系の
一要素である第1b群を回動させて変倍光学系が振動
(傾動)したときの画像のブレを補正するように構成す
ることにより、防振時における光学性能の劣化を少なく
抑えつつ装置全体の小型化を図った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, as described above, the first lens group, which is one element of the variable power optical system, is rotated to correct the image blur when the variable power optical system vibrates (tilts). With this configuration, it is possible to achieve a variable-magnification optical system having an anti-vibration function that reduces the size of the entire apparatus while minimizing deterioration of optical performance during anti-vibration.
【図面の簡単な説明】[Brief description of the drawings]
【図1】 本発明の実施例1の光学系の近軸屈折力配置
を示す概略図
FIG. 1 is a schematic diagram showing a paraxial refractive power arrangement of an optical system according to a first embodiment of the present invention.
【図2】 本発明の数値実施例1のレンズ断面図FIG. 2 is a sectional view of a lens according to a numerical example 1 of the present invention.
【図3】 本発明の数値実施例1の広角端における諸収
差図
FIG. 3 is a diagram illustrating various aberrations at the wide-angle end according to Numerical Embodiment 1 of the present invention.
【図4】 本発明の数値実施例1の中間における諸収差
FIG. 4 is a diagram showing various aberrations in the middle of the first numerical embodiment of the present invention;
【図5】 本発明の数値実施例1の望遠端における諸収
差図
FIG. 5 is a diagram illustrating various aberrations at the telephoto end in Numerical Example 1 of the present invention.
【図6】 本発明の数値実施例1の望遠端における偏心
なしの状態の横収差図
FIG. 6 is a lateral aberration diagram without decentering at the telephoto end according to Numerical Embodiment 1 of the present invention.
【図7】 本発明の数値実施例1の望遠端における2度
のブレ角を補正した状態の横収差図
FIG. 7 is a lateral aberration diagram of the numerical example 1 of the present invention in a state where a 2 degree blur angle at the telephoto end is corrected.
【図8】 本発明の数値実施例2の広角端における諸収
差図
FIG. 8 is a diagram illustrating various aberrations at the wide-angle end according to Numerical Embodiment 2 of the present invention.
【図9】 本発明の数値実施例2の中間における諸収差
FIG. 9 is a diagram showing various aberrations in the middle of Numerical Example 2 of the present invention.
【図10】 本発明の数値実施例2の望遠端における諸
収差図
FIG. 10 is a diagram showing various aberrations at the telephoto end in Numerical Example 2 of the present invention.
【図11】 本発明の数値実施例2の望遠端における偏
心なしの状態の横収差図
FIG. 11 is a lateral aberration diagram without decentering at the telephoto end in Numerical Embodiment 2 of the present invention.
【図12】 本発明の数値実施例2の望遠端における2
度のブレ角を補正した状態の横収差図
FIG. 12 illustrates a second example of the second embodiment at the telephoto end in Numerical Embodiment 2 of the present invention.
Lateral aberration diagram with the degree of blurring corrected
【図13】 本発明の数値実施例3の広角端における諸
収差図
FIG. 13 is a diagram illustrating various aberrations at the wide-angle end according to Numerical Embodiment 3 of the present invention.
【図14】 本発明の数値実施例3の中間における諸収
差図
FIG. 14 is a diagram showing various aberrations in the middle of Numerical Embodiment 3 of the present invention.
【図15】 本発明の数値実施例3の望遠端における諸
収差図
FIG. 15 is a diagram showing various aberrations at the telephoto end in Numerical Example 3 of the present invention.
【図16】 本発明の数値実施例3の望遠端における偏
心なしの状態の横収差図
FIG. 16 is a lateral aberration diagram without decentering at the telephoto end in Numerical Example 3 of the present invention.
【図17】 本発明の数値実施例3の望遠端における2
度のブレ角を補正した状態の横収差図
FIG. 17 is a diagram illustrating a second embodiment of the third numerical embodiment of the present invention at the telephoto end.
Lateral aberration diagram with the degree of blurring corrected
【符号の説明】[Explanation of symbols]
1 第1群 1a 第1a群 1b 第1b群 2 第2群 3 第3群 4 第4群 d d線 g g線 y 像高 Y 最大像高 ΔM メリディオナル像面 ΔS サジタル像面 Reference Signs List 1 1st group 1a 1a group 1b 1b group 2 2nd group 3 3rd group 4 4th group d d line g g line y Image height Y Maximum image height ΔM Meridional image plane ΔS Sagittal image plane

Claims (2)

    (57)【特許請求の範囲】(57) [Claims]
  1. 【請求項1】 変倍部より物体側に変倍及び合焦の際に
    固定の第1群を設けた変倍光学系であって、該第1群は
    固定の第1a群と光軸上の一点を回転中心にして回動し
    て像ブレを補正する第1b群とを有し、該第1a群中の
    少なくとも1つのレンズ面は中心部から周辺部にいくに
    従い正の屈折力が強くなる形状の非球面より成り、第1
    b群の焦点距離をf1b、該第1b群の後側主点から該
    回転中心までの距離をL、望遠端における全系の焦点距
    離をfTとしたとき 0.5 <|f1b/L| <1.2 0.53<|f1b/fT|<0.65 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 variable power optical system having a fixed first lens unit at the time of zooming and focusing on an object side of a zooming unit, wherein the first lens unit is fixed on the optical axis with a fixed first lens unit. And a first lens group that corrects image blur by rotating about one point as a rotation center. At least one lens surface in the first lens group has a stronger positive refractive power from the center to the periphery. The first shape
    When the focal length of the b group is f1b, the distance from the rear principal point of the 1b group to the rotation center is L, and the focal length of the entire system at the telephoto end is fT, 0.5 <| f1b / L | < 1.2 0.53 <| f1b / fT | <0.65. A variable power optical system having an anti-vibration function, characterized by satisfying the following condition.
  2. 【請求項2】 前記変倍光学系は物体側より順に変倍及
    び合焦の際に固定の正の屈折力の第1群、変倍機能を有
    する負の屈折力の第2群、固定の正の屈折力の第3群、
    そして変倍により変動する像面を補正する補正機能と合
    焦機能の双方の機能を有する正の屈折力の第4群の4つ
    のレンズ群を有してい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. The variable magnification optical system includes a first group of fixed positive refractive power, a second group of negative refractive power having a variable magnification function, and a fixed A third group of positive refractive power,
    2. The image forming apparatus according to claim 1, further comprising: a fourth lens unit having a positive refractive power, which has both a correction function and a focusing function for correcting an image plane that fluctuates due to zooming. Variable power optical system with anti-vibration function.
JP4186185A 1992-06-19 1992-06-19 Variable power optical system with anti-vibration function Expired - Fee Related JP2998434B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4186185A JP2998434B2 (en) 1992-06-19 1992-06-19 Variable power optical system with anti-vibration function

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4186185A JP2998434B2 (en) 1992-06-19 1992-06-19 Variable power optical system with anti-vibration function
US08/338,211 US5521758A (en) 1992-06-19 1994-11-09 Variable-magnification optical system capable of image stabilization

Publications (2)

Publication Number Publication Date
JPH063626A JPH063626A (en) 1994-01-14
JP2998434B2 true JP2998434B2 (en) 2000-01-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2998434B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3369598B2 (en) * 1992-07-20 2003-01-20 オリンパス光学工業株式会社 Zoom lens
JP4581042B2 (en) * 2000-02-04 2010-11-17 富士フイルム株式会社 Zoom lens
US6511790B2 (en) 2000-08-25 2003-01-28 Fuji Photo Film Co., Ltd. Alkaline liquid developer for lithographic printing plate and method for preparing lithographic printing plate
JP5949438B2 (en) * 2012-10-23 2016-07-06 株式会社ニコン Optical system and optical apparatus having the same
JP6296786B2 (en) * 2013-12-25 2018-03-20 キヤノン株式会社 Zoom lens and imaging apparatus having the same

Also Published As

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JPH063626A (en) 1994-01-14

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