JP2535969B2 - Variable magnification optical system with anti-vibration function - Google Patents

Variable magnification optical system with anti-vibration function

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Publication number
JP2535969B2
JP2535969B2 JP62274962A JP27496287A JP2535969B2 JP 2535969 B2 JP2535969 B2 JP 2535969B2 JP 62274962 A JP62274962 A JP 62274962A JP 27496287 A JP27496287 A JP 27496287A JP 2535969 B2 JP2535969 B2 JP 2535969B2
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JP
Japan
Prior art keywords
lens
image
optical
variable power
aberration
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 - Lifetime
Application number
JP62274962A
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Japanese (ja)
Other versions
JPH01116619A (en
Inventor
望 北岸
浩二 大泉
Original Assignee
キヤノン株式会社
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Priority to JP62274962A priority Critical patent/JP2535969B2/en
Priority claimed from US07/261,231 external-priority patent/US5270857A/en
Publication of JPH01116619A publication Critical patent/JPH01116619A/en
Application granted granted Critical
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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
    • G02B15/143Optical 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 three groups only

Description

【発明の詳細な説明】 (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
可動レンズ群の小型軽量化及び可動レンズ群を、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ると共に、アクチュエ
ーターの制御性の向上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。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a function of correcting blurring of a captured image due to vibration,
Regarding a variable power optical system having a so-called image stabilization function, particularly when the movable lens group for image stabilization is reduced in size and weight and the movable lens group is moved, for example, in a direction orthogonal to the optical axis to exert an image stabilization effect. The present invention relates to a variable power optical system having a vibration isolation function for preventing deterioration of optical performance and improving the controllability of an actuator.
(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像画像にブレが生じる。
(Prior Art) When an image is captured from a moving object such as a car or an airplane in progress, vibration is transmitted to the image capturing system and the captured image is blurred.
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56−2
1133号公報、特開昭61−223819号公報等で提案されてい
る。
Conventionally, an image stabilizing optical system having a function of preventing blurring of a photographed image has been disclosed in Japanese Patent Application Laid-Open No. 50-80147 and Japanese Patent Publication No. 56-2
No. 1133, Japanese Patent Application Laid-Open No. Sho 61-223819, and the like.
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M2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 JP-A-50-80147, when the angular magnification of the first variable power system is M 1 and the angular magnification of the second variable power system is M 2 in a zoom lens having two afocal variable power systems, M 1 = 1-1
Magnification is changed in each variable power system so as to have a relationship of / M 2 , and the second variable power system is spatially fixed to correct image blur to stabilize the image.
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。
In Japanese Patent Publication No. 56-21133, the image is moved by moving some optical members in a direction that cancels the vibrational displacement of the image due to the vibration in accordance with the output signal from the detection means for detecting the vibration state of the optical device. We are trying to stabilize.
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像系において、撮像系の振
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 JP-A-61-223819, in an image pickup system in which a refractive variable apex angle prism is arranged closest to the object side, an image is obtained by changing the apex angle of the refractive variable apex angle prism in response to the vibration of the image pickup system. The image is stabilized by deflecting it.
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, JP-B-56-34847 and JP-B-57-7414 dispose a spatially fixed optical member with respect to vibration in a part of the photographing system, and generate the optical member with respect to the vibration of the optical member. The still image is obtained on the imaging plane by deflecting the captured image by utilizing the prism action.
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。
Also, a method of detecting a vibration of a photographing system using an acceleration sensor and obtaining a still image by vibrating a part of a lens group of the photographing system in a direction orthogonal to an optical axis according to a signal obtained at this time is also available. Is being done.
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応答性の良い
ことが要求される。
In general, a mechanism for obtaining a still image by eliminating vibration of a photographed image by vibrating a part of a lens group of the photographing system is required to have good responsiveness.
この為、可動レンズ群をなるべく小型軽量化し、かつ
慣性質量を小さくし、更に画像のブレの補正量と可動レ
ンズの移動量との関係を単純化し、変換の為の演算時間
の短縮化を図った撮影系が要求されている。
For this reason, the movable lens group is made as small and lightweight as possible, the inertial mass is reduced, the relationship between the image blur correction amount and the movable lens movement amount is simplified, and the calculation time for conversion is shortened. A shooting system is required.
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、そして偏心像面湾曲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るしく低下させる原因
となってくる。
Further, when the movable lens group is decentered, if many eccentric coma, eccentric astigmatism, eccentric field curvature, etc. occur, the image becomes blurred due to eccentric aberration when the image blur is corrected.
For example, if 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. Therefore,
If the movable lens group is decentered in order to correct the image blur for the image on the optical axis, a phenomenon similar to the image blur will occur in the peripheral part, and it will cause a significant deterioration in the optical characteristics. .
このように防振用の撮影系、特に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
の少ないことが要求されている。
As described above, in the image pickup system for image stabilization, particularly in the variable power optical system, when the movable lens group is moved in the direction orthogonal to the optical axis to be in the eccentric state, the eccentric aberration generation amount is small and the deterioration of the optical performance is small. Is required.
しかしながら、以上の諸条件を全て満足させた撮影系
を得るのは一般に大変困難で、特に撮影系の一部の屈折
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 an imaging system that satisfies all of the above conditions. In particular, decentering a lens group having a part of refractive power of the imaging system greatly reduces the optical performance, resulting in a good image. There was a drawback that was not obtained.
(発明が解決しようとする問題点) 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画像のブレを補正する際、可動レン
ズの小型軽量化を図り、応答性を向上させ、又、可動レ
ンズ群を移動させて平行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。
(Problems to be Solved by the Invention) The present invention aims to reduce the size and weight of a movable lens when correcting a blur of an image by moving a part of lens groups of a variable power optical system in a direction orthogonal to an optical axis. , A variable power optical system having an anti-vibration function, which improves the responsiveness, and produces good optical performance with a small amount of the various decentering aberrations described above when the movable lens group is moved for parallel decentering. For the purpose of providing.
(問題点を解決する為の手段) 複数のレンズ群を有し、このうち隣接する2つのレン
ズ群より成るレンズ間隔のうち少なくとも1つのレンズ
群間隔を変えて変倍を行う変倍光学系において、該変倍
光学系の変倍位置を検知する変倍位置検知手段を設け、
該変倍位置検知手段からの変倍位置信号に基づいて該レ
ンズ群間隔に対する両側のレンズ群のうち少なくとも一
方のレンズ群、又はフォーカス用のフォーカスレンズ
群、又は該フォーカスレンズ群に隣接するレンズ群を光
軸と直交する方向に移動させることにより撮影画像のブ
レを補正したことである。
(Means for Solving the Problem) In a variable power optical system having a plurality of lens groups and changing the distance by changing at least one lens group interval among lens intervals formed by two adjacent lens groups A variable power position detecting means for detecting a variable power position of the variable power optical system,
At least one lens group among the lens groups on both sides with respect to the lens group spacing based on the variable power position signal from the variable power position detection means, a focus lens group for focusing, or a lens group adjacent to the focus lens group. Is to correct the blurring of the captured image by moving in the direction orthogonal to the optical axis.
(実施例) 第1〜第3図は本発明に係る変倍光学系において、例
えば振動により画像がブレたときの該画像のブレを補正
する方法を示す模式図である。同図に示す変倍光学系は
物体側より順に正の屈折力の第1レンズ群1と負の屈折
力の第2レンズ群2の2つのレンズ群を有し、両レンズ
群の間隔を変えて変倍を行い、又、第1レンズ群1を光
軸上移動させてフォーカスを行う、所謂2群ズームレン
ズを示している。尚、5は結像面3上の点Aに結像する
光束、4は変倍光学系の光軸である。図中(A)は広角
端、(B)は望遠端の光学配置を示している。
(Embodiment) FIGS. 1 to 3 are schematic diagrams showing a method of correcting a blur of an image when the image blurs due to, for example, vibration in a variable power optical system according to the present invention. The variable power optical system shown in FIG. 1 has two lens groups, a first lens group 1 having a positive refractive power and a second lens group 2 having a negative refractive power, in order from the object side. FIG. 1 shows a so-called two-unit zoom lens that performs zooming and performs focusing by moving the first lens unit 1 on the optical axis. In addition, 5 is a light beam which forms an image at a point A on the image plane 3, and 4 is an optical axis of the variable power optical system. In the figure, (A) shows the optical arrangement at the wide-angle end, and (B) shows the optical arrangement at the telephoto end.
第1図は振動がなく画像のブレがないときの光学系の
模式図である。図中、光束5は振動がなく画像のブレが
ない為、広角端及び望遠端において結像面3上の一点A
に結像している。
FIG. 1 is a schematic diagram of an optical system when there is no vibration and there is no image blurring. In the figure, since the light beam 5 has no vibration and no image blur, one point A on the image plane 3 at the wide-angle end and the telephoto end.
Image.
第2図は振動が変倍光学系に伝わり画像がブレたとき
の光学系の模式図である。同図においては簡単の為に広
角側及び望遠側において、点Aを中心として変倍光学系
全体が前倒れとなり画像のブレを起こしたときの光束の
ブレによる結像状態を示している。
FIG. 2 is a schematic diagram of the optical system when vibration is transmitted to the variable power optical system and an image is blurred. In the same figure, for the sake of simplicity, the image formation state due to the blurring of the light flux is shown on the wide-angle side and the telephoto side when the entire variable-magnification optical system tilts forward around the point A and the image blurs.
即ち、本来なら点Aに結像すべき光束5が広角側では
結像面3上の点Bに、又、望遠側では結像面3上の点C
に各々結像している。
That is, the light beam 5 to be focused on the point A is point B on the image plane 3 on the wide-angle side, and point C on the image plane 3 on the telephoto side.
Are imaged respectively.
今、フィルム露光中であって第2図(A)に示す状態
から第2図(B)に示す状態へ単調に変倍光学系が傾き
画像のブレが生じた場合、ブレが無ければ点Aに点像と
して結像すべき像は広角側では線分AB、望遠側では線分
ACのボケた線像となって結像する。
Now, during film exposure, if the variable-magnification optical system tilts monotonously from the state shown in FIG. 2A to the state shown in FIG. The image to be formed as a point image at the wide angle side is line segment AB, and at the telephoto side is line segment
It is formed as a blurred line image of AC.
第3図は第2図の画像のブレに対して補正を行ったと
きの模式図である。同図においては第1レンズ群1をブ
レ補正用の可動レンズ群とし、光軸4に対して直交方向
に平行偏心させて画像のブレを補正している。図中、4a
は第1レンズ群の光軸であり、ブレ補正前の共軸であっ
た第1レンズ群と第2レンズ群の光軸4とは平行になっ
ている。
FIG. 3 is a schematic diagram when the blurring of the image in FIG. 2 is corrected. In the figure, the first lens group 1 is a movable lens group for image blur correction, and the image blur is corrected by decentering the optical axis 4 in a direction orthogonal to the optical axis 4. In the figure, 4a
Is the optical axis of the first lens group, and the optical axis 4 of the first lens group and the optical axis 4 of the second lens group, which were coaxial before blur correction, are parallel.
同図に示すように変倍光学系全体の前倒れによる画像
のブレに対して第1レンズ群を所定量だけ平行偏心させ
ることにより、第2図に示すように広角端で点B、望遠
端で点Cに結像してしまう光束を本来の結像点である点
Aに結像させることができる。
As shown in FIG. 2, the first lens group is decentered in parallel by a predetermined amount with respect to the image blur caused by the forward tilt of the entire variable power optical system, so that the point B at the wide angle end and the telephoto end as shown in FIG. Thus, the light beam which forms an image at the point C can be formed at the point A which is an original image forming point.
このように第1レンズ群を平行偏心させることにより
画像の安定化を図っている。尚、本実施例では第1レン
ズ群の代わりに第2レンズ群を平行偏心させても同様に
画像のブレを補正することができる。
By thus decentering the first lens group in parallel, the image is stabilized. In the present embodiment, the blurring of the image can be similarly corrected even if the second lens group is decentered in parallel instead of the first lens group.
本実施例において第1レンズ群であるブレ補正用の可
動レンズ群の平行偏心量Eは画像のブレ量をδy、可動
レンズ群の偏心敏感度をSとしたとき E=−δy/S …………(1) となる。ここで画像のブレ量δyは例えば第2図におい
て、広角側では線分ABの長さ、望遠側では線分ACの長さ
にマイナス符号を付したものである。
In the present embodiment, the parallel eccentric amount E of the movable lens unit for shake correction, which is the first lens unit, is E = −δy / S, where δy is the image blur amount and S is the eccentricity sensitivity of the movable lens unit. … (1). Here, the image blurring amount δy is obtained, for example, by adding a minus sign to the length of the line segment AB on the wide angle side and the length of the line segment AC on the telephoto side in FIG.
これはE,δyの符号を光軸に対して上方をプラス、下
方をマイナスとしている為である。
This is because the signs of E and δy are plus for the upper part of the optical axis and minus for the lower part.
偏心敏感度Sは可動レンズ群の平行偏心量に対する結
像面上での像点の移動量の比である。
The eccentric sensitivity S is a ratio of the amount of movement of the image point on the image plane to the amount of parallel eccentricity of the movable lens group.
本実施例では画像のブレ量δyを検知し、変倍光学系
に固有の可動レンズ群の偏心敏感度Sを基にして、画像
のブレ補正の為の可動レンズ群の平行偏心量Eを(1)
式より得ている。
In the present embodiment, the image blur amount δy is detected, and the parallel eccentric amount E of the movable lens group for image blur correction is calculated based on the decentering sensitivity S of the movable lens group peculiar to the variable power optical system. 1)
It is obtained from the formula.
尚、本発明は第1図〜第3図に示す2群ズームレンズ
に限らず複数のレンズ群を有し、そのうちの少なくとも
1つのレンズ群間隔を変化させて変倍を行う変倍光学系
であれば、どのような変倍光学系にも適用することがで
きる。
The present invention is not limited to the two-group zoom lens shown in FIG. 1 to FIG. 3, but has a plurality of lens groups, and is a variable power optical system for varying the magnification by changing the interval of at least one of the lens groups. If it can be applied to any variable power optical system.
次に一般の変倍光学系において、画像のブレ量と該ブ
レ量を補正する為の補正用の可動レンズ群と移動量との
関係を示す。ブレ量は各種の検知手段により種々の形で
検知されるが、以下簡単の為に全てブレ量|δy|に換算
して説明する。
Next, in a general variable-magnification optical system, the relationship between the image blurring amount, the movable lens group for correction for correcting the blurring amount, and the moving amount will be shown. The blur amount can be detected in various forms by various detecting means, but for simplicity, all will be described in terms of the blur amount | δy |.
可動レンズ群を第P群とし、該第P群の平行偏心量を
EP、第P群の近軸横倍率をBP、第P群よりも像面側に配
置されているレンズ系全体の近軸横倍率をβとすると EP=−|δy|/{(1−β)・β} ……(2) となる。ここで(1−β)・βは偏心敏感度であ
る。(2)式は収差を考慮していない一般式である為、
実際には各種の収差を考慮して若干変化させて行うのが
良い。
The movable lens group is the P-th group, and the parallel decentering amount of the P-th group is
E P , the paraxial lateral magnification of the P-th group is B P , and the paraxial lateral magnification of the entire lens system arranged closer to the image plane than the P-th group is β q , E P = − | δy | / { the (1-β P) · β q} ...... (2). Here, (1-β P ) · β q is the eccentricity sensitivity. Since equation (2) is a general equation that does not consider aberration,
In practice, it is better to slightly change it in consideration of various aberrations.
変倍光学系においては画像のブレ補正用の可動レンズ
群の光学系中の位置によって(2)式のβP等が変
化し、この結果|δy|と(1−β)・βの比が変化
してくるので、変倍位置を検知する変倍位置検知手段を
設けて補正を行うのが好ましい。
In the variable power optical system, β P , β q and the like in the equation (2) change depending on the position of the movable lens group for image blur correction in the optical system. As a result, | δy | and (1-β P ) ・Since the ratio of β q changes, it is preferable to provide a variable power position detecting means for detecting the variable power position for correction.
尚、本実施例において特に偏心収差の発生を少なくし
つつ、画像のブレを良好に補正するには |(1−β)・βq|>0.1 ……(3) を満足するように変倍光学系を構成するのが良い。
In the present embodiment, in order to satisfactorily correct the image blurring while reducing the occurrence of eccentric aberration, it is preferable to change to satisfy | (1−β P ) · β q |> 0.1 (3) It is better to construct a double optical system.
条件式(3)を外れると画像のブレ補正用の可動レン
ズ群の移動量が増大すると共に、可動レンズ群のレンズ
外径が増大してくるので良くない。
If the conditional expression (3) is not satisfied, the moving amount of the movable lens unit for image blur correction increases and the lens outer diameter of the movable lens unit increases, which is not preferable.
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。
Generally, if an attempt is made to correct image blur by decentering a part of lens groups of an optical system in parallel, decentration aberrations occur and the imaging performance deteriorates.
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。
Therefore, next, in an arbitrary refractive power arrangement, when the movable lens group is moved in the direction orthogonal to the optical axis to correct the blurring of the image, the occurrence of decentering aberration is considered from an aberrational standpoint.
Explained based on the method presented by Matsui at the 23rd Lecture on Applied Physics (1962).
撮影レンズの一部のレンズ群をEだけ平行偏心させた
ときの全系の収差量Δ′Y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。ここで偏心収差ΔY(E)は(b)式に
示す様に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2次の偏心非点収差(III E2)、2次の偏心像面
弯曲(PE2)、2次の偏心歪曲収差(VE21)、2次の偏
心歪曲附加収差(VE22)、そして1次の原点移動(Δ
E)、3次の原点移動(ΔE3)で表わされる。又(c)
式から(m)式の(II E)〜(ΔE3)までの収差は物体
側より順に固定レンズ群と可動レンズ群の2つのレンズ
群より構成し、可動レンズ群を平行偏心させる撮影レン
ズにおいて可動レンズ群への光線の入射角と射出角を各
々αP,▲▼としたときに可動レンズ群の収差係数
IP,IIP,IIIP,PP,VPを用いて表わされる。
The aberration amount Δ'Y of the entire system when a part of the lens group of the photographing lens is decentered by parallel E is the aberration amount ΔY before decentering and the eccentric aberration amount ΔY (E) generated by decentering as shown in equation (a).
Will be the sum of Here, the eccentric aberration ΔY (E) is the first-order eccentric coma aberration (II E), the first-order eccentric astigmatism (III E), and the first-order eccentric field curvature (PE) as shown in the equation (b). 1st-order eccentric distortion aberration (VE1), 1st-order eccentric distortion-added aberration (VE2),
The secondary decentering astigmatism (III E 2), a secondary decentering field plane distortion (PE 2), 2-order decentering distortion (VE 2 1), 2-order decentering distortion shark aberration (VE 2 2) , And the primary origin movement (Δ
E) It is represented by the third origin movement (ΔE 3 ). Also (c)
The aberrations from (II E) to (ΔE 3 ) in the equations (m) are composed of two lens groups, a fixed lens group and a movable lens group, in order from the object side. The aberration coefficient of the movable lens group when the incident angle and the exit angle of the light ray to the movable lens group are α P and ▲ ▼, respectively.
It is expressed using I P , II P , III P , P P , and V P.
Δ′Y=ΔY+ΔY(E) (a) (PE)=−αPPP (e) (PE2)=αP 2PP (i) (VE22)=α▲▼PP (k) (ΔE)=−2(α′−α) (l) 以上の式から偏心収差の発生を小さくする為には可動
レンズ群の諸収差係数IP,IIP,IIIP,PP,VPを小さな値と
するか、若しくは(b)式〜(k)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。そして可動レンズ群におい
ては球面収差、コマ収差、ペッツバール和の他に非点収
差、歪曲収差を良好に補正することが必要となってく
る。
Δ'Y = ΔY + ΔY (E) (a) (PE) = - α P P P (e) (PE 2 ) = α P 2 P P (i) (VE 2 2) = α P ▲ ▼ P P (k) (ΔE) = - 2 (α 'P -α P) (l) From the above equation, in order to reduce the occurrence of decentration aberration, the various aberration coefficients I P , II P , III P , P P , V P of the movable lens group are set to small values, or the equations (b) to (k It is necessary to set the various aberration coefficients in a well-balanced manner so as to cancel each other out, as shown in the equation). In the movable lens group, it is necessary to satisfactorily correct astigmatism and distortion in addition to spherical aberration, coma and Petzval sum.
一般に可動レンズ群における軸上収差と共に軸外収差
をバランス良く補正するには、可動レンズ群中における
軸上光線の高さhと軸外光線の主光線の高さとが互い
に異った値をとるようにレンズ系を構成することが必要
となってくる。
Generally, in order to correct off-axis aberrations as well as on-axis aberrations in the movable lens group in a well-balanced manner, the height h of on-axis rays and the height of principal rays of off-axis rays in the movable lens groups have different values. It becomes necessary to configure the lens system as described above.
この為、本実施例では可動レンズ群を後述する数値実
施例で示すように複数のレンズより構成すると共に、変
倍光学系中における可動レンズ群を前述の如く設定する
ことにより可動レンズ群を偏心させたときの偏心収差の
発生量を少なくしている。
Therefore, in the present embodiment, the movable lens group is composed of a plurality of lenses as shown in the numerical examples described later, and the movable lens group in the variable power optical system is set as described above to decenter the movable lens group. The amount of eccentric aberration generated when it is set is reduced.
一般に変倍光学系においては変倍、又はフォーカスに
際して移動させるレンズ群、又は該レンズ群に隣接する
レンズ群はレンズ群内で比較的良好に収差が補正されて
いるか、若しくはその近傍に収差をバランス良く補正す
るレンズ群が存在している場合が多い。又、該レンズ群
と隣接したレンズ群との合成系を考えた場合にも、各収
差が良好に補正されている場合が多い。
In general, in a variable power optical system, a lens group to be moved at the time of zooming or focusing, or a lens group adjacent to the lens group has a relatively good aberration correction in the lens group, or balances the aberration in the vicinity thereof. In many cases, there is a lens group that performs good correction. Also, when considering a composite system of the lens group and an adjacent lens group, each aberration is often corrected well.
この為、本実施例では前述の如く変倍に際して移動さ
せる変倍レンズ群、若しくは変倍レンズ群の両側のレン
ズ群のうち少なくとも一方のレンズ群、若しくはフォー
カスの際移動させるフォーカスレンズ群、若しくは該フ
ォーカスレンズ群の少なくとも片側のレンズ群を画像の
ブレ補正用の可動レンズ群とし光軸と直交する方向に移
動させることにより、偏心収差の発生量を少なくしつつ
画像のブレを良好に補正している。
Therefore, in this embodiment, as described above, the variable power lens group that is moved during zooming, or at least one of the lens groups on both sides of the variable power lens group, or the focus lens group that is moved during focusing, or At least one lens group of the focus lens group is used as a movable lens group for image blur correction, and is moved in the direction orthogonal to the optical axis, so that the amount of eccentric aberration is reduced and the image blur is well corrected. There is.
特に前述の(C)式〜(g)式の各偏心収差係数の増
大を防止し、所定の画像のブレを補正しつつ、光学性能
の低下を防止した変倍光学系を達成している。
In particular, a variable power optical system is achieved which prevents the decentering aberration coefficients of the above equations (C) to (g) from increasing, corrects the blurring of a predetermined image, and prevents deterioration of the optical performance.
第4図は本発明の数値実施例の変倍光学系のレンズ断
面図である。同図において(A)は広角端、(B)は望
遠端である。Iは負の屈折力の第1レンズ群、IIは正の
屈折力の第2レンズ群、IIIは負の屈折力の第3レンズ
群である。第2,第3レンズ群、II,IIIを矢印の如く移動
させて広角端から望遠端への変倍を行っている。
FIG. 4 is a lens sectional view of a variable power optical system of a numerical example according to the present invention. In the figure, (A) is the wide-angle end, and (B) is the telephoto end. I is a first lens group having a negative refractive power, II is a second lens group having a positive refractive power, and III is a third lens group having a negative refractive power. The second and third lens units II and III are moved as indicated by arrows to change the magnification from the wide-angle end to the telephoto end.
本実施例では第1,第2,第3レンズ群、I,II,IIIのうち
いずれか1つのレンズ群を平行偏心させれば画像のブレ
を補正することが可能となる。
In this embodiment, image blurring can be corrected by decentering any one of the first, second and third lens groups I, II and III.
第5図(A),(B)は数値実施例の広角端と望遠端
の横収差図である。同図においてy0は物体高、y1は像高
である。
FIGS. 5A and 5B are lateral aberration diagrams of the numerical example at the wide-angle end and the telephoto end. Y 0 is the object height in the figure, y 1 denotes the image height.
次に数値実施例において、レンズ系全体をフィルム面
を中心に例として9分前倒れさせ、このときの画像のブ
レを補正する為の第1,第2,第3レンズ群を各々独立に表
−1に示す値だけ平行偏心させたときの横収差図を参考
例として第6,第7,第8図に示す。図中、(A)は広角
端、(B)は望遠端である。
Next, in Numerical Examples, the entire lens system is tilted forward by 9 minutes with respect to the film surface as an example, and the first, second, and third lens groups for correcting the blurring of the image at this time are independently displayed. Lateral aberration diagrams when parallel eccentricity is given by the value shown in −1 are shown in FIGS. 6, 7, and 8 as reference examples. In the figure, (A) is the wide-angle end and (B) is the telephoto end.
又、表−2〜表−4に各レンズ群で画像のブレを補正
したときの偏心歪曲収差の補正状態を示す為に各物体高
におけるフィルム面上での主光線の結像位置を示す。
Further, Tables 2 to 4 show the image forming positions of the chief ray on the film surface at each object height in order to show the correction state of the eccentric distortion when the image blur is corrected by each lens group.
第6,第7,第8図及び表−2,表−3,表−4に示すように
本実施例によれば、可動レンズ群の平行偏心により偏心
収差の発生量を少なくしつつ偏心歪曲を良好に補正し、
かつ所定の画像のブレを補正した高い光学性能を有した
変倍光学系を達成している。
According to the present embodiment, as shown in FIGS. 6, 7, 8 and Table-2, Table-3, and Table-4, the eccentric distortion can be achieved while reducing the amount of eccentric aberration due to the parallel decentering of the movable lens group. Corrected well,
Moreover, a variable power optical system having a high optical performance in which a predetermined image blur is corrected is achieved.
尚、以上の実施例においては可動レンズ群を平行偏心
させて画像のブレを補正した場合について示したが回転
偏心させて行っても、又、双方を同時に行っても同様に
本発明の目的を達成することができる。
In the above embodiments, the case where the movable lens group is decentered in parallel to correct the blurring of the image has been described, but the same object of the present invention is obtained even if the lens is rotationally decentered or both are performed at the same time. Can be achieved.
変倍光学系の振動等によるブレはフィルム中心に限ら
ず、どの点を中心にブレていても本発明は良好に適用す
ることができる。画像のブレ補正用のレンズ群は1つに
限らず2つ以上のレンズ群を独立に偏心させて行っても
良い。画像のブレの補正は全変倍範囲にわたり一様に行
う代わりにブレの発生いやすい望遠側においてのみ行う
ようにしても良い。
The blur caused by the vibration of the variable magnification optical system is not limited to the center of the film, and the present invention can be suitably applied to any point of blur. The number of lens groups for image blur correction is not limited to one, but two or more lens groups may be independently decentered. The image blur correction may be performed only on the telephoto side where blurring is likely to occur, instead of uniformly performing it over the entire zoom range.
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ν
r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。
Next, numerical examples of the present invention will be shown. In the numerical example
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 gap from the object side, Ni and ν
r is the refractive index and Abbe number of the glass of the i-th lens in order from the object side.
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Rを近軸曲率半径、A,B,C,D,
Eを各々非球面係数としたとき なる式で表わしている。
The aspherical shape has an X axis along the optical axis and H along the direction perpendicular to the optical axis.
Axis, light traveling direction is positive, R is paraxial radius of curvature, A, B, C, D,
When E is each aspherical coefficient It is expressed by
数値実施例 第2面の非球面係数 B=5.319×10-6 C=1.919×108 D=−4.745×10-13 E=1.304×10-13 各レンズ群偏心敏感度(1−β)・β (発明の効果) 本発明によれば変倍光学系を構成するレンズ群のう
ち、前述の条件を満す少なくとも1つのレンズ群を偏心
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。
Numerical examples Aspherical coefficient of the second surface B = 5.319 × 10 −6 C = 1.919 × 10 8 D = −4.745 × 10 −13 E = 1.304 × 10 −13 Decentering Sensitivity of Each Lens Group (1-β P ) · β q Table (Effect of the Invention) According to the present invention, among the lens groups constituting the variable power optical system, at least one lens group satisfying the above-mentioned conditions is decentered to correct the blurring of an image and to be decentered due to decentering. It is possible to achieve a variable power optical system having an image stabilizing function capable of maintaining high optical performance by suppressing the amount of aberration as much as possible.
【図面の簡単な説明】 第1〜第3図は本発明の変倍光学系において画像のブレ
を補正する方法の一実施例の模式図、第4図は本発明の
変倍光学系の数値実施例のレンズ断面図、第5(A),
(B)は本発明の数値実施例の収差図、第6図〜第8図
は本発明の数値実施例において各レンズ群を偏心させた
ときの収差図である。 図中、I,II、IIIは各々第1,第2,第3レンズ群、y0は物
体高、y1は像高である。
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 are schematic diagrams of an embodiment of a method for correcting image blur in a variable power optical system of the present invention, and FIG. 4 is a numerical value of the variable power optical system of the present invention. Sectional view of lens of Example, 5 (A),
FIG. 6B is an aberration diagram of a numerical example of the present invention, and FIGS. 6 to 8 are aberration diagrams when each lens group is decentered in the numerical example of the present invention. In the figure, I, II, and III are the first, second, and third lens groups, respectively, y 0 is the object height, and y 1 is the image height.

Claims (1)

    (57)【特許請求の範囲】(57) [Claims]
  1. 【請求項1】複数のレンズ群を有し、このうち隣接する
    2つのレンズ群より成るレンズ間隔のうち少なくとも1
    つのレンズ群間隔を変えて変倍を行う変倍光学系におい
    て、該変倍光学系の変倍位置を検知する変倍位置検知手
    段を設け、該変倍位置検知手段からの変倍位置信号に基
    づいて該レンズ群間隔に対する両側のレンズ群のうち少
    なくとも一方のレンズ群、又はフォーカス用のフォーカ
    スレンズ群、又は該フォーカスレンズ群に隣接するレン
    ズ群を光軸と直交する方向に移動させることにより撮影
    画像のブレを補正したことを特徴とする防振機能を有し
    た変倍光学系。
    1. A plurality of lens groups, at least one of which is a lens interval composed of two adjacent lens groups.
    In a variable power optical system which performs variable power by changing the distance between two lens groups, a variable power position detecting means for detecting a variable power position of the variable power optical system is provided, and a variable power position signal from the variable power position detecting means is provided. Based on the distance between the lens groups, at least one of the lens groups on both sides, a focus lens group for focusing, or a lens group adjacent to the focus lens group is moved in a direction orthogonal to the optical axis for photographing. A variable-magnification optical system having an image stabilization function characterized by correcting image blur.
JP62274962A 1987-10-30 1987-10-30 Variable magnification optical system with anti-vibration function Expired - Lifetime JP2535969B2 (en)

Priority Applications (1)

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JP62274962A JP2535969B2 (en) 1987-10-30 1987-10-30 Variable magnification optical system with anti-vibration function
US07/261,231 US5270857A (en) 1987-10-30 1988-10-24 Optical system for stabilizing an image

Publications (2)

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JPH01116619A JPH01116619A (en) 1989-05-09
JP2535969B2 true JP2535969B2 (en) 1996-09-18

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JP2836142B2 (en) * 1989-12-07 1998-12-14 ミノルタ株式会社 Zoom lens
JPH0420941A (en) * 1990-05-16 1992-01-24 Canon Inc Camera with image blur correcting means
JPH0882769A (en) 1994-09-14 1996-03-26 Minolta Co Ltd Zoom lens having function to correct hand shake
US5781348A (en) * 1995-09-26 1998-07-14 Nikon Corporation Zoom lens system
US6473231B2 (en) 1997-03-18 2002-10-29 Canon Kabushiki Kaisha Variable magnification optical system having image stabilizing function
US6414800B1 (en) 1999-05-10 2002-07-02 Canon Kabushiki Kaisha Variable magnification optical system and camera having the same
JP3564014B2 (en) 1999-09-28 2004-09-08 キヤノン株式会社 Zoom lens having anti-vibration function and television camera having the same
JP4447704B2 (en) 1999-10-20 2010-04-07 キヤノン株式会社 Variable magnification optical system and camera having the same
US6392816B1 (en) 1999-10-29 2002-05-21 Canon Kabushiki Kaisha Variable magnification optical system and optical apparatus having the same
JP4109884B2 (en) 2002-04-04 2008-07-02 キヤノン株式会社 Zoom lens and optical apparatus having the same
JP2008164724A (en) 2006-12-27 2008-07-17 Sony Corp Zoom lens and imaging apparatus
JP5895497B2 (en) * 2010-12-17 2016-03-30 株式会社ニコン OPTICAL SYSTEM, IMAGING DEVICE, AND OPTICAL SYSTEM MANUFACTURING METHOD
CN103370647B (en) * 2010-12-17 2018-02-02 株式会社尼康 Optical system, imaging device and the method for manufacturing optical system
JP5948840B2 (en) * 2010-12-17 2016-07-06 株式会社ニコン OPTICAL SYSTEM, IMAGING DEVICE, AND OPTICAL SYSTEM MANUFACTURING METHOD

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JPS6243614A (en) * 1985-08-22 1987-02-25 Canon Inc Rear focus type zoom lens
JPS6247012A (en) * 1985-08-26 1987-02-28 Canon Inc Vibration-proof optical device

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Publication number Priority date Publication date Assignee Title
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