JPH1144845A - Rear focus type zoom lens provided with vibration-proof function and image pickup device using the same - Google Patents
Rear focus type zoom lens provided with vibration-proof function and image pickup device using the sameInfo
- Publication number
- JPH1144845A JPH1144845A JP9215722A JP21572297A JPH1144845A JP H1144845 A JPH1144845 A JP H1144845A JP 9215722 A JP9215722 A JP 9215722A JP 21572297 A JP21572297 A JP 21572297A JP H1144845 A JPH1144845 A JP H1144845A
- Authority
- JP
- Japan
- Prior art keywords
- group
- lens
- zoom lens
- refractive power
- image
- 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.)
- Pending
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 +-++
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
- Lenses (AREA)
- Adjustment Of Camera Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は防振機能を有したリ
ヤーフォーカス式のズームレンズ及びそれを用いた撮像
装置に関し、特にビデオカメラ、そして放送用カメラ等
の撮像装置に用いられる像面側に色分解プリズムを設け
ることができる程度に長いバックフォーカスを有し、か
つ振動による撮影画像の像ブレ（画像ブレ）補正する機
能、所謂防振機能を有した大口径比で高変倍比のレンズ
全長の短い小型の防振機能を有したリヤーフォーカス式
のズームレンズ及びそれを用いた撮像装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear focus type zoom lens having an image stabilizing function and an image pickup apparatus using the same, and more particularly to an image plane used for an image pickup apparatus such as a video camera and a broadcast camera. A lens with a large aperture ratio and a high zoom ratio that has a back focus long enough to provide a color separation prism and has a function of correcting image blur (image blur) of a captured image due to vibration, a so-called anti-shake function. The present invention relates to a short-length, short-rear, rear-focus type zoom lens having an anti-vibration function and an image pickup apparatus using the same.
【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手ブレとなり
撮影画像にブレが生じる。2. Description of the Related Art When a photograph is taken from a moving object such as a car or an aircraft in progress, vibration is transmitted to a photographing system, resulting in camera shake and blurring of a photographed image.
【０００３】従来よりこのときの撮影画像の像ブレを防
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 image blurring of a captured image at this time have been proposed.
【０００４】例えばビデオカメラやシネカメラ等の撮像
装置においては撮影系が防振したときに発生する像ブレ
を光学的又は電子的に補正するようにした防振機能を装
着したものが種々と提案されている。For example, various types of image pickup apparatuses such as video cameras and cine cameras have been proposed which are equipped with an image stabilizing function for optically or electronically correcting image blur generated when an image pickup system performs image stabilization. ing.
【０００５】像ブレを光学的に補正する方法としてレン
ズ系の中に可変頂角プリズムを設け、該可変頂角プリズ
ムのプリズム頂角が振動に伴って変化するように偏心駆
動させ、これにより像ブレを補正する方法がある。As a method for optically correcting image blur, a variable apex angle prism is provided in a lens system, and the variable apex angle prism is driven eccentrically so that the prism apex angle changes with vibration. There is a method of correcting blur.
【０００６】本出願人は、例えば特開平６−２３０３１
７号公報において、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、絞り、正の屈折力の第３群、
そして正の屈折力の第４群の４つのレンズ群と、該絞り
の物体側又は像面側に可変頂角プリズムとを有し、該第
２群を像面側へ移動させて広角端から望遠端への変倍を
行い、変倍に伴う像面変動を該第４群を移動させて補正
すると共に該第４群を移動させてフォーカスを行う変倍
光学系であって、該可変頂角プリズム頂角を変化させる
ことにより、該変倍光学系が振動により傾いたときに生
ずる撮影画像の像ブレを補正するようにした防振機能を
有した変倍光学系を提案している。The applicant of the present invention has disclosed, for example, Japanese Patent Application Laid-Open No. 6-23031.
In the publication No. 7, in order from the object side, the first positive refractive power
Group, second group of negative refractive power, aperture, third group of positive refractive power,
A fourth lens group having a positive refractive power and a variable apex angle prism on the object side or the image plane side of the diaphragm; and moving the second group to the image plane side to move the second group from the wide-angle end. A variable power optical system that performs zooming to a telephoto end, corrects an image plane variation caused by zooming by moving the fourth unit, and focuses by moving the fourth unit. A variable power optical system having an image stabilizing function has been proposed which corrects image blurring of a photographed image caused when the variable power optical system is tilted by vibration by changing the vertex angle of the angular prism.
【０００７】一方最近、ホームビデオカメラ等の小型軽
量化に伴い、撮像用のズームレンズの小型化にも目覚ま
しい進歩が見られ、特にレンズ全長の短縮化や前玉径の
小型化、構成の簡略化に力が注がれている。On the other hand, in recent years, as home video cameras and the like have become smaller and lighter, remarkable progress has been made in miniaturization of zoom lenses for image pickup. Emphasis is being placed on the transition.
【０００８】これらの目的を達成する一つの手段とし
て、物体側の第１群以外のレンズ群を移動させてフォー
カスを行う、所謂リヤーフォーカス式のズームレンズが
知られている。As one means for achieving these objects, there is known a so-called rear focus type zoom lens which performs focusing by moving a lens group other than the first group on the object side.
【０００９】一般にリヤーフォーカス式のズームレンズ
は第１群を移動させてフォーカスを行うズームレンズに
比べて第１群の有効径が小さくなり、レンズ系全体の小
型化が容易になり、又近接撮影、特に極近接撮影が容易
となり、更に比較的小型軽量のレンズ群を移動させて行
っているので、レンズ群の駆動力が小さくてすみ迅速な
焦点合わせができる等の特長がある。In general, a rear focus type zoom lens has a smaller effective diameter of the first lens group than a zoom lens which moves and focuses the first lens group, so that the entire lens system can be easily miniaturized, and close-up photographing can be performed. In particular, since extremely close-up photography is facilitated and the relatively small and lightweight lens group is moved, the driving force of the lens group is small and quick focusing can be performed.
【００１０】このようなリヤーフォーカス式のズームレ
ンズとして、例えば特開昭６２−２１５２２５号公報
や、特開昭６２−２０６５１６号公報，特開昭６２−２
４２１３号公報，特開昭６３−２４７３１６号公報、そ
して特開平４−４３３１１号公報では、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、第２群を移動させて変倍を行い、第４群を移動
させて変倍に伴う像面変動とフォーカスを行っている。As such a rear focus type zoom lens, for example, JP-A-62-215225, JP-A-62-220616, and JP-A-62-262.
No. 4213, JP-A-63-247316 and JP-A-4-43311 disclose, in order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a positive lens having a positive refractive power. The zoom lens has four lens groups, a third lens group and a fourth lens group having a positive refractive power. The second lens group is moved to perform zooming, and the fourth lens group is moved to change the image plane due to zooming and focus. It is carried out.
【００１１】この他、最近のビデオデッキの高性能化
（デジタル化）に伴い、ビデオカメラの高画質化が種々
となされている。その１つとして色分解光学系による画
像の色分解がある。このようなビデオカメラ用のズーム
レンズが、例えば特開平５−７２４７４号公報，特開平
６−５１１９９号公報，特開平７−１９９０６９号公
報，特開平７−２７０６８４号公報等で提案されてい
る。In addition, with the recent high performance (digitalization) of video decks, various improvements have been made to the image quality of video cameras. One of them is color separation of an image by a color separation optical system. Such a zoom lens for a video camera has been proposed in, for example, JP-A-5-72474, JP-A-6-51199, JP-A-7-199069, and JP-A-7-270684.
【００１２】[0012]
【発明が解決しようとする課題】一般に可変頂角プリズ
ムを撮影系の一部に設け、撮影系が振動したとき、それ
に伴って可変頂角プリズムのプリズム頂角を変えて撮影
画像の像ブレを補正する方法は、比較的容易に静止画像
が得られるという特長がある。Generally, a variable apex angle prism is provided in a part of a photographing system, and when the photographing system vibrates, the prism apex angle of the variable apex angle prism is changed in accordance with the vibration to reduce image blur of a photographed image. The correction method has a feature that a still image can be obtained relatively easily.
【００１３】しかしながら光学系中に可変頂角プリズム
を配置すると、防振時に周辺光量を確保するため前玉径
が増大したり、周辺光量が変化したりする。又可変頂角
プリズムのプリズム頂角を変化させたときに、偏心コマ
や偏心非点収差等の偏心収差が多く発生してくるという
問題点がある。However, when the variable apex angle prism is disposed in the optical system, the front lens diameter increases or the peripheral light quantity changes to secure the peripheral light quantity during image stabilization. Further, when the apex angle of the variable apex angle prism is changed, there is a problem that many eccentric aberrations such as eccentric coma and eccentric astigmatism are generated.
【００１４】この他、可変頂角プリズムの物体側の光学
系の屈折力配置によって物体側での光束の曲がり角と可
変頂角プリズムのプリズム頂角との関係が変化してくる
為、防振に必要なプリズム頂角が大きくなり、駆動制御
が難しくなってくるという問題点がある。In addition, the relationship between the bending angle of the light beam on the object side and the prism apex angle of the variable apex angle prism changes depending on the refractive power arrangement of the optical system on the object side of the variable apex angle prism. There is a problem that the required prism apex angle becomes large and drive control becomes difficult.
【００１５】一方ズームレンズにおいてリヤーフォーカ
ス方式を採用するとレンズ系全体が小型化され又迅速な
るフォーカスが可能となり、更に近接撮影が容易となる
等の特長が得られる。On the other hand, when the rear focus method is adopted for the zoom lens, the whole lens system can be reduced in size, quick focus can be achieved, and further advantages such as easy close-up photographing can be obtained.
【００１６】しかしながら反面、色分解プリズムを配置
できる程度の長いバックフォーカスを確保しつつ、フォ
ーカスの際の収差変動を少なくし、無限遠物体から近距
離物体に至る物体距離全般にわたり高い光学性能を得よ
うとすると、そのレンズ構成が大変難しくなってくる。On the other hand, on the other hand, while ensuring a long back focus enough to dispose a color separation prism, fluctuations in aberrations during focusing are reduced, and high optical performance is obtained over the entire object distance from an object at infinity to a close object. If so, the lens configuration becomes very difficult.
【００１７】特に大口径比で高変倍比を確保したズーム
レンズでは長いバックフォーカスを確保しつつ全変倍範
囲にわたり、又物体距離全般にわたり高い光学性能を得
るのが大変難しくなってくる。In particular, in a zoom lens having a large aperture ratio and a high zoom ratio, it is extremely difficult to obtain high optical performance over the entire zoom range and over the entire object distance while securing a long back focus.
【００１８】例えば前述した特開平５−７２４７４号公
報，特開平６−５１１９９号公報，特開平７−１９９０
６９号公報，特開平７−２７０６８４号公報等で提案さ
れているズームレンズは、変倍比が１０〜１２倍程度で
あり、ビデオカメラに用いるには変倍比が必ずしも十分
でなかった。For example, JP-A-5-72474, JP-A-6-51199, and JP-A-7-1990 mentioned above.
The zoom lens proposed in JP-A-69-69, JP-A-7-270684 and the like have a zoom ratio of about 10 to 12 times, and the zoom ratio is not always sufficient for use in a video camera.
【００１９】本発明はリヤーフォーカス方式を採用しつ
つ、像面側に色分解プリズムや光学フィルター等を配置
することができる程度の長いバックフォーカスを有し、
又ズームレンズ全体が振動で傾いたときに発生する撮影
画像の像ブレを偏心収差の発生量を小さく押えつつ良好
に補正し、かつ大口径比で、変倍比１６倍と高変倍比を
有し、広角端から望遠端に至る全変倍範囲にわたり、又
無限遠物体から超至近物体に至る物体距離全般にわた
り、良好なる光学性能が得られる防振機能を有したリヤ
ーフォーカス式のズームレンズ及びそれを用いた撮像装
置の提供を目的とする。The present invention employs a rear focus system and has a long back focus such that a color separation prism, an optical filter and the like can be arranged on the image plane side.
In addition, image blurring of a photographed image that occurs when the entire zoom lens is tilted due to vibration is satisfactorily corrected while suppressing the amount of eccentric aberration to be small. A rear-focusing zoom lens with vibration-proof function that provides good optical performance over the entire zoom range from the wide-angle end to the telephoto end, and over the entire object distance from infinity to super-close objects. And an imaging device using the same.
【００２０】[0020]
【課題を解決するための手段】本発明の防振機能を有し
たリヤーフォーカス式のズームレンズは、 (1-1) 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、開口絞り、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、該第２群を像
面側へ移動させて広角端から望遠端への変倍を行い、変
倍に伴う像面変動を該第４群の一部又は全部を移動させ
て補正すると共に該第４群の一部又は全部を移動させて
フォーカスを行うズームレンズであって、該絞りの近傍
に可変頂角プリズムを設け、該可変頂角プリズムのプリ
ズム頂角を変化させることにより、該ズームレンズが傾
いたときに生ずる撮影画像の像ブレを補正しており、広
角端のズーム位置における該第２群と第３群の間隔、該
開口絞りと該第３群の間隔を各々Ｄ２３Ｗ，ＤＳ３Ｗと
したとき ０．１８＜ＤＳ３Ｗ／Ｄ２３Ｗ＜０．３７ ‥‥（１） なる条件を満足することを特徴としている。According to the present invention, there is provided a rear focus type zoom lens having an image stabilizing function comprising: (1-1) a first group having a positive refractive power and a first group having a negative refractive power in order from the object side. The zoom lens has four lens groups, namely, a second group, an aperture stop, a third group having a positive refractive power, and a fourth group having a positive refractive power. The second group is moved to the image plane side to shift from the wide-angle end to the telephoto end. With a zoom lens that performs zooming and corrects the image plane variation due to zooming by moving part or all of the fourth group, and moves part or all of the fourth group to focus. A variable apex angle prism is provided in the vicinity of the stop, and by changing a prism apex angle of the variable apex angle prism, an image blur of a captured image caused when the zoom lens is tilted is corrected. The distance between the second group and the third group and the distance between the aperture stop and the third group at the zoom position at the wide-angle end are respectively When D23W and DS3W are set, a condition of 0.18 <DS3W / D23W <0.37 (1) is satisfied.
【００２１】本発明の防振機能を有したリヤーフォーカ
ス式のズームレンズを有した撮像装置は、 (2-1) 構成(1-1) の防振機能を有したリヤーフォーカス
式のズームレンズと、その像面側に色分解光学系を有し
ていることを特徴としている。An image pickup apparatus having a rear focus type zoom lens having an image stabilizing function according to the present invention includes: (2-1) a rear focus type zoom lens having an image stabilizing function having the constitution (1-1); And a color separation optical system on the image plane side.
【００２２】[0022]
【発明の実施の形態】図１は本発明のリヤーフォーカス
式のズームレンズを有した撮像装置の実施形態１の要部
断面図、図２，図３，図４は実施形態１の広角端，中
間，望遠端のズーム位置における収差図である。FIG. 1 is a sectional view of an essential part of an image pickup apparatus having a rear focus type zoom lens according to a first embodiment of the present invention, and FIGS. FIG. 8 is an aberration diagram at a zoom position at a middle or telephoto end.
【００２３】図５は本発明のリヤーフォーカス式のズー
ムレンズを有した撮像装置の実施形態２の要部断面図、
図６，図７，図８は実施形態２の広角端，中間，望遠端
のズーム位置における収差図である。FIG. 5 is a sectional view of a main part of a second embodiment of an image pickup apparatus having a rear focus type zoom lens according to the present invention.
FIGS. 6, 7 and 8 are aberration diagrams of the second embodiment at zoom positions at the wide-angle end, the middle position, and the telephoto end.
【００２４】図９は本発明のリヤーフォーカス式のズー
ムレンズを有した撮像装置の実施形態３の要部断面図、
図１０，図１１，図１２は実施形態３の広角端，中間，
望遠端のズーム位置における収差図である。FIG. 9 is a sectional view of an essential part of a third embodiment of an image pickup apparatus having a rear focus type zoom lens according to the present invention.
FIGS. 10, 11, and 12 show the wide-angle end, the middle,
FIG. 7 is an aberration diagram at a zoom position at a telephoto end.
【００２５】図中Ｌ１は正の屈折力の第１群、Ｌ２は負
の屈折力の第２群、Ｌ３は正の屈折力の第３群、Ｌ４は
正の屈折力の第４群、Ｌ５は第５群である。ＳＰは開口
絞りであり、第３群Ｌ３の前方に配置している。ＧＡは
ズームレンズの保護を目的とした必要に応じて設けられ
る保護ガラス、尚、数値実施例２では固定の第５群Ｌ５
が保護ガラスの役目をしている。ＧＢは色分解プリズム
やフェースプレートやフィルター等のガラスブロックで
ある。ＩＰは像面であり、ＣＣＤ等の撮像素子が配置さ
れている。ＶＰは可変頂角プリズムであり、絞りＳＰの
近傍（本実施形態では絞りＳＰの像面側）に配置してい
る。In the drawing, L1 is a first lens unit having a positive refractive power, L2 is a second lens unit having a negative refractive power, L3 is a third lens unit having a positive refractive power, L4 is a fourth lens unit having a positive refractive power, L5. Is the fifth group. SP denotes an aperture stop, which is arranged in front of the third lens unit L3. GA is a protective glass provided as needed for the purpose of protecting the zoom lens. In Numerical Example 2, a fixed fifth lens unit L5 is provided.
Serves as a protective glass. GB is a glass block such as a color separation prism, a face plate, and a filter. IP is an image plane on which an image sensor such as a CCD is arranged. VP is a variable apex angle prism, and is disposed near the stop SP (in the present embodiment, on the image plane side of the stop SP).
【００２６】第１群Ｌ１から保護ガラスＧＡまでの各要
素はズームレンズ（ズームレンズ部）ＺＬの一要素を構
成している。ガラスブロックＧＢと撮像素子はカメラ本
体ＣＢ内に収納されている。ズームレンズ部ＺＬはマウ
ント部材Ｃを介してカメラ本体ＣＢに着脱可能に装着さ
れている。Each element from the first lens unit L1 to the protective glass GA constitutes one element of the zoom lens (zoom lens unit) ZL. The glass block GB and the imaging device are housed in the camera body CB. The zoom lens unit ZL is detachably attached to the camera body CB via a mount member C.
【００２７】本実施形態では広角端から望遠端への変倍
に際して矢印のように第２群を像面側へ移動させると共
に、変倍に伴う像面変動を第４群の一部又は全部（本実
施形態では全部）を物体側に凸状の軌跡を有しつつ移動
させて補正している。In this embodiment, when zooming from the wide-angle end to the telephoto end, the second lens unit is moved to the image plane side as indicated by an arrow, and the image plane fluctuation due to zooming is partly or entirely included in the fourth lens unit. In the present embodiment, all of them are corrected while moving along a convex locus toward the object side.
【００２８】又、第４群の一部又は全部（本実施形態で
は全部）を光軸上移動させてフォーカスを行うリヤーフ
ォーカス式を採用している。同図に示す第４群の実線の
曲線４ａと点線の曲線４ｂは各々無限遠物体と近距離物
体にフォーカスしているときの広角端から望遠端への変
倍に伴う際の像面変動を補正する為の移動軌跡を示して
いる。尚、第１群と第３群は変倍及びフォーカスの際固
定である。Also, a rear focus system is employed in which a part or the whole (all in the present embodiment) of the fourth unit is moved on the optical axis to perform focusing. A solid line curve 4a and a dotted line curve 4b of the fourth lens group shown in the same figure show the image plane fluctuation caused by zooming from the wide-angle end to the telephoto end when focusing on an object at infinity and an object at a short distance, respectively. The movement locus for correction is shown. The first and third units are fixed during zooming and focusing.
【００２９】本実施例においては第４群を移動させて変
倍に伴う像面変動の補正を行うと共に第４群を移動させ
てフォーカスを行うようにしている。特に同図の曲線４
ａ、４ｂに示すように広角端から望遠端への変倍に際し
て物体側へ凸状の軌跡を有するように移動させている。
これにより第３群と第４群との空間の有効利用を図りレ
ンズ全長の短縮化を効果的に達成している。In this embodiment, the fourth lens unit is moved to correct the image plane fluctuation caused by zooming, and the fourth lens unit is moved for focusing. In particular, curve 4 in FIG.
When zooming from the wide-angle end to the telephoto end, as shown in FIGS.
Thereby, the space between the third and fourth units is effectively used, and the overall length of the lens is effectively reduced.
【００３０】本実施例において、例えば望遠端において
無限遠物体から近距離物体へフォーカスを行う場合は同
図の直線４ｃに示すように第４群を前方へ繰り出すこと
により行っている。In this embodiment, for example, when focusing from an object at infinity to an object at a short distance at the telephoto end, the fourth unit is moved forward as indicated by a straight line 4c in FIG.
【００３１】次に本実施形態の可変頂角プリズムＶＰに
ついて図１４を用いて説明する。図１４においてＶＰは
可変頂角プリズムユニットを示しており、駆動部と共に
拡大している。１０と１１は透光性の入射端板と射出端
板を示す。１２はベローズ等の折り曲げ自在な薄膜筒、
１３は所望の屈折率を持った透光性の液体（又はシリコ
ンゴム等の弾性体であっても良い。）で、液体１３は薄
膜筒１２と端板１０と１１のなす空間に封入されてい
る。従って、例えば端板１０を固定として端板１１の縁
に加圧すると端板１１は傾いてプリズム頂角θの光学系
が形成される。Next, the variable apex angle prism VP of this embodiment will be described with reference to FIG. In FIG. 14, VP indicates a variable apex angle prism unit, which is enlarged together with the driving unit. Reference numerals 10 and 11 denote a light-transmitting entrance end plate and an exit end plate. 12 is a bendable thin film cylinder such as a bellows,
Reference numeral 13 denotes a translucent liquid having a desired refractive index (or may be an elastic body such as silicon rubber). The liquid 13 is sealed in a space formed between the thin film cylinder 12 and the end plates 10 and 11. I have. Accordingly, for example, when the edge of the end plate 11 is pressed while the end plate 10 is fixed, the end plate 11 is inclined to form an optical system having a prism apex angle θ.
【００３２】１４はアクチュエーターで、駆動軸が端板
１１とフレキシブルに連結されている。図ではアクチュ
エーター１４を１個示しているが、例えば光軸を中心に
１２０度分離して３個設けるとかして全ての半径方向に
ついて所望の光学系が形成されるようになっている。１
５は傾角検出センサーで、例えばジャイロなどの加速度
センサーも使用できる。傾角検出センサー１５も光軸回
りに複数個設けることにより、いずれの方向の撮影レン
ズの傾きも検出することができるようになっている。An actuator 14 has a drive shaft flexibly connected to the end plate 11. Although one actuator 14 is shown in the figure, a desired optical system is formed in all radial directions by, for example, providing three actuators separated by 120 degrees about the optical axis. 1
Reference numeral 5 denotes an inclination detection sensor, for example, an acceleration sensor such as a gyro can also be used. By providing a plurality of inclination detection sensors 15 around the optical axis, the inclination of the photographing lens in any direction can be detected.
【００３３】１６はマイクロコンピューターで、各傾角
検出センサー１５の出力と可変頂角プリズムユニットの
配置位置を考慮した変倍情報１７に基づき各アクチュエ
ーター１４の駆動の入出量を算出し、出力信号でアクチ
ュエーター１４を制御している。なお、薄膜筒のかわり
に軟弾性の樹脂板を使っても良い。Reference numeral 16 denotes a microcomputer which calculates the drive input / output amount of each actuator 14 based on the output of each tilt angle detection sensor 15 and magnification information 17 in consideration of the position of the variable apex prism unit. 14 is controlled. Note that a soft elastic resin plate may be used instead of the thin film cylinder.
【００３４】本実施形態ではこのような構成の可変頂角
プリズムＶＰを絞りＳＰの像面側に配置している。そし
てズームレンズが振動して撮影画像に像ブレが発生した
ときはブレ検知手段１５で検知し、そのときのブレ量に
応じて駆動手段１４で可変頂角プリズムＶＰのプリズム
頂角を変えて通過光束を所定量偏光させて、これにより
像ブレを補正している。In the present embodiment, the variable apex angle prism VP having such a configuration is arranged on the image plane side of the stop SP. When the zoom lens vibrates and an image blur occurs in the captured image, the blur is detected by the blur detecting means 15 and the driving means 14 changes the prism apex angle of the variable apex angle prism VP according to the amount of the blur at the time and passes. The light beam is polarized by a predetermined amount, thereby correcting the image blur.
【００３５】尚、本発明のビデオカメラ（撮像装置）
は、少なくとも上記ズームレンズと、色分解用素子と該
色分解素子によって分割された各色対応の撮像素子と、
撮像信号処理回路等から構成されている。The video camera (imaging device) of the present invention
Is at least the zoom lens, a color separation element and an image sensor corresponding to each color divided by the color separation element,
It is composed of an imaging signal processing circuit and the like.
【００３６】本実施形態では前述の如く広角端のズーム
位置における第２群と第３群の間隔Ｄ２３Ｗ、そして開
口絞りＳＰと第３群の間隔Ｄ２３Ｗとを前述の条件式
（１）の如く設定している。In this embodiment, as described above, the distance D23W between the second lens unit and the third lens unit and the distance D23W between the aperture stop SP and the third lens unit at the zoom position at the wide-angle end are set as in the above-mentioned conditional expression (1). doing.
【００３７】すなわち、開口絞りと第３群の距離ＤＳ３
Ｗを大きく広げることにより、第２群にて発散された軸
上光束を大きく広げ、第３群に入射する軸上光線高さを
より高くしている。同時に軸外光束が第３群に入射する
高さも高くしている。これにより、第３群から射出する
光束を略アフォーカルとしている。That is, the distance DS3 between the aperture stop and the third lens unit
By widening W, the on-axis luminous flux diverged by the second group is greatly expanded, and the height of the on-axis ray incident on the third group is further increased. At the same time, the height at which the off-axis light flux enters the third group is also increased. Thus, the light beam emitted from the third group is substantially afocal.
【００３８】そして全系の焦点距離を所定量とする為の
第４群の焦点距離を長くすることができ、ワーキングデ
ィスタンスとしてのバックフォーカスを長くしている。
すなわち第３群から射出する光束が略アフォーカルであ
るためバックフォーカスの長さは主点系で計算するとほ
ぼ第４群の焦点距離と同じとなる。従って全系の焦点距
離を固定して第４群の焦点距離を長くする為には図１３
で示される如く第３群での軸上光高さｈを高くしてい
る。Further, the focal length of the fourth lens unit for making the focal length of the entire system a predetermined amount can be increased, and the back focus as a working distance is extended.
That is, since the light beam emitted from the third lens unit is substantially afocal, the length of the back focus is substantially the same as the focal length of the fourth lens unit when calculated using the principal point system. Therefore, in order to fix the focal length of the entire system and extend the focal length of the fourth lens group, FIG.
As shown by, the on-axis light height h in the third lens unit is increased.
【００３９】本実施形態では以上のようにレンズ構成を
設定することにより、全変倍範囲にわたり、又、物体距
離全体にわたり高い光学性能を得ている。In this embodiment, by setting the lens configuration as described above, high optical performance is obtained over the entire zoom range and over the entire object distance.
【００４０】次に本発明の防振機能を有したリヤーフォ
ーカス式のズームレンズのこの他のレンズ構成の特徴に
ついて説明する。Next, the features of another lens configuration of the rear focus type zoom lens having the image stabilizing function of the present invention will be described.
【００４１】［Ａ１］開口絞りＳＰを第２群と第３群の
間であって、かつ広角端における第２群と第３群の軸上
距離の約１／３程、第３群の前方に配置している。そし
て第２群で発散された軸上光束が十分に高くなってか
ら、正の単レンズで構成される第３群で略アフォーカル
にするレンズ構成としている。これにより、第４群の焦
点距離を長くし、バックフォーカスを長くすることに貢
献している。[A1] The aperture stop SP is located between the second and third lens groups and about one third of the axial distance between the second and third lens groups at the wide-angle end, in front of the third lens group. Has been placed. Then, after the on-axis luminous flux diverged by the second group becomes sufficiently high, the third group constituted by a positive single lens is made substantially afocal. This contributes to increasing the focal length of the fourth lens unit and increasing the back focus.
【００４２】［Ａ２］広角端で無限遠物体にフォーカス
したときの前記第４群から像面までの空気換算量をＢＦ
Ｗ、広角端における全系の焦点距離、Ｆナンバー、そし
て半画角を順にｆＷ，ＦＮＷ，ωｗとしたとき[A2] The amount of air conversion from the fourth lens unit to the image plane when focusing on an object at infinity at the wide-angle end is represented by BF
W, where fW, FNW, and ωw are the focal length of the entire system at the wide-angle end, the F-number, and the half angle of view, respectively.
【００４３】[0043]
【数３】 なる条件を満足するようにしている。条件式（２）を満
足することにより所定の長さのバックフォーカスを確保
している。(Equation 3) To satisfy certain conditions. By satisfying conditional expression (2), a back focus of a predetermined length is secured.
【００４４】［Ａ３］軸上光束が広角端で高い位置を通
る第３群又は第４群に非球面を設けることにより球面収
差及びコマ収差を良好に補正している。[A3] By providing an aspherical surface in the third or fourth lens unit in which the on-axis light beam passes at a high position at the wide-angle end, spherical aberration and coma are well corrected.
【００４５】［Ａ４］前記第２群の焦点距離をｆ２、広
角端における全系のＦナンバーと焦点距離を各々ＦＮ
Ｗ，ｆＷ、望遠端における全系の焦点距離をｆＴとし、[A4] The focal length of the second lens unit is f2, and the F-number and the focal length of the entire system at the wide-angle end are FN, respectively.
W, fW, the focal length of the entire system at the telephoto end is fT,
【００４６】[0046]
【数４】 とおいたとき ０．６２＜｜ｆ２｜×ＦＮＷ／ｆＭ＜０．８３ ‥‥（３） なる条件を満足するようにしている。(Equation 4) 0.62 <| f2 | × FNW / fM <0.83 (3)
【００４７】条件式（３）を満足することによりバック
フォーカスを長く維持しながらも第２群の屈折力を適当
に配分することを可能とし、レンズの高性能化を図って
いる。By satisfying conditional expression (3), it is possible to appropriately distribute the refractive power of the second lens unit while maintaining a long back focus, thereby achieving high performance of the lens.
【００４８】条件式（３）は、第２群の焦点距離を制限
するためのものである。上限値を越えて第２群の焦点距
離が長くなると、所定のズーム比を得るためには第２群
のズームによる移動量を増やさねばならず、レンズ全長
の大型化をまねく。又下限値を越えて短くなると第２群
で発生する収差、特に色収差やコマ収差、像面湾曲に影
響するペッツバール和が悪化し、補正が困難になる。Conditional expression (3) is for limiting the focal length of the second lens unit. If the focal length of the second lens unit becomes longer than the upper limit, the amount of movement of the zoom lens of the second lens unit must be increased in order to obtain a predetermined zoom ratio, resulting in an increase in the overall length of the lens. On the other hand, if the distance is shorter than the lower limit, aberrations occurring in the second lens group, in particular, Petzval sum, which affects chromatic aberration, coma, and curvature of field, become worse and correction becomes difficult.
【００４９】［Ａ５］望遠端の色収差を充分に補正する
ために第２群は、少なくとも２枚の負レンズと少なくと
も１枚の正レンズから構成している。[A5] In order to sufficiently correct the chromatic aberration at the telephoto end, the second unit includes at least two negative lenses and at least one positive lens.
【００５０】［Ａ６］第２群と第３群の主点間隔を拡大
するため該第２群の最も像面側に負レンズを配置し、こ
れによりさらにバックフォーカスを長くしている。[A6] In order to increase the distance between the principal points of the second and third lens units, a negative lens is arranged closest to the image plane of the second lens unit, thereby further increasing the back focus.
【００５１】［Ａ７］良好な収差補正、特に色収差を良
好に補正するために、第４群に少なくとも１つの正の接
合レンズを有するようにしている。先にも述べたよう
に、ビデオカメラの高画質化にともない、従来あまり問
題にならなかった色収差、特に倍率色収差が問題とな
り、これを良好に補正している。[A7] In order to satisfactorily correct aberrations, especially chromatic aberrations, the fourth lens unit has at least one positive cemented lens. As described above, with the improvement of the image quality of the video camera, chromatic aberration which has not been much of a problem in the past, particularly chromatic aberration of magnification, has become a problem, and this has been corrected well.
【００５２】［Ａ８］本実施形態のズームレンズは高変
倍比であるため、テレ端の焦点距離が非常に長くなり、
テレ端及びその付近の性能が該第２群に大きく影響され
てくる。そこに第３群又は第４群に非球面を配置するこ
とにより、光学性能を上げている。尚、非球面は、基本
的に球面収差の補正を目的としているため、レンズの周
辺部にいくにしたがって正の屈折力が弱くなる形状とな
ることが望ましい。[A8] Since the zoom lens of this embodiment has a high zoom ratio, the focal length at the telephoto end becomes extremely long.
The performance at and near the telephoto end is greatly affected by the second lens unit. The optical performance is improved by arranging the aspherical surface in the third or fourth group. Since the aspherical surface basically aims at correcting spherical aberration, it is desirable that the aspherical surface has a shape in which the positive refractive power becomes weaker toward the periphery of the lens.
【００５３】［Ａ９］本発明は、前述の如く高変倍を目
的としたものであるから、変倍に伴って発生する収差は
第１群及び第２群においてキャンセルすることが望まし
い。しかるに変倍に伴う収差の発生の仕方は第１群と第
２群のそれとでは異なり、広角端では補正過剰の傾向と
なりやすい。[A9] Since the present invention aims at a high zoom ratio as described above, it is desirable that aberrations generated by zooming be canceled in the first and second units. However, the manner of occurrence of aberrations due to zooming differs between the first and second groups, and tends to be overcorrected at the wide-angle end.
【００５４】そこで本発明においては、前記第ｉ群の焦
点距離をｆｉとしたとき ０．１６＜｜ｆ２／ｆ１｜＜０．２ ‥‥（４） なる条件を満足するようにしている。Therefore, in the present invention, when the focal length of the i-th lens unit is fi, the following condition is satisfied: 0.16 <| f2 / f1 | <0.2 (4)
【００５５】条件式（４）の上限値を越えるとペッツバ
ール和が負の方向に大きくなり、像面が大きくプラス側
に倒れる傾向になり好ましくない。逆に、下限値を越え
ると高変倍のために第２群の移動量を大きく取る必要が
あり前玉径の大型化、レンズ全長の長大化をまねくので
良くない。When the value exceeds the upper limit of conditional expression (4), the Petzval sum increases in the negative direction, and the image surface tends to largely fall to the plus side, which is not preferable. Conversely, if the lower limit value is exceeded, it is necessary to increase the moving distance of the second lens unit for high zooming, which leads to an increase in the diameter of the front lens and an increase in the overall length of the lens.
【００５６】［Ａ１０］第４群の焦点距離をｆ４、広角
端で無限遠物体にフォーカスしたときの第３群と第４群
の間隔をＤ３４Ｗ、広角端の焦点距離をｆＷとしたとき ４．６＜ｆ４／ｆＷ＜６．２ ‥‥（５） ０．２５＜Ｄ３４Ｗ／ｆ４＜０．５６ ‥‥（６） を満足するようにしている。[A10] When the focal length of the fourth lens unit is f4, the distance between the third lens unit and the fourth lens unit when focusing on an object at infinity at the wide angle end is D34W, and the focal length at the wide angle end is fW. 6 <f4 / fW <6.2 (5) 0.25 <D34W / f4 <0.56 (6)
【００５７】条件式（５），（６）は所定のバックフォ
ーカスを確保しつつ高性能化，高変倍化，そして大口径
化を図る為のものである。The conditional expressions (5) and (6) are for achieving high performance, high zoom ratio, and large aperture while securing a predetermined back focus.
【００５８】条件式（５）はバックフォーカスの長さを
最適化するもので上限値を越えるとバックフォーカスが
必要以上に長くなり全長の長大化をまねき、下限値を越
えると本発明の目的である充分に長いバックフォーカス
を確保することが困難となる。Conditional expression (5) optimizes the length of the back focus. If the upper limit value is exceeded, the back focus becomes unnecessarily long and the overall length becomes longer. If the lower limit value is exceeded, the objective of the present invention is achieved. It becomes difficult to secure a certain sufficiently long back focus.
【００５９】条件式（６）はフォーカスのための第４群
の移動可能な空間と望遠端の焦点距離の関係を最適化す
るもので、上限値を越えるほど間隔Ｄ３４Ｗを大きくと
るとレンズ全長の長大化をまねき好ましくなく、下限値
を越えるとフォーカスのための充分な空間を確保できな
くなり、ズームレンズの操作性に支障がでてくる。Conditional expression (6) is for optimizing the relationship between the movable space of the fourth unit for focusing and the focal length at the telephoto end. If the lower limit value is exceeded, it is not possible to secure a sufficient space for focusing, which impairs the operability of the zoom lens.
【００６０】［Ａ１１］良好な収差補正、特に色収差を
良好に補正するためには、第４群中の少なくとも１つの
正レンズの材質のアッベ数をν４Ｐとしたとき ６４＜ν４Ｐ ‥‥（７） なる条件を満足することである。[A11] In order to satisfactorily correct aberrations, especially chromatic aberration, when the Abbe number of the material of at least one positive lens in the fourth group is ν4P, 64 <ν4P ‥‥ (7) Satisfying the following conditions.
【００６１】条件式（４）は特に倍率色収差を良好に補
正するための条件であり、条件式（７）の下限値を越え
てアッベ数が小さくなると、倍率色収差がアンダーにな
り好ましくない。Conditional expression (4) is a condition for favorably correcting lateral chromatic aberration. If the Abbe number is smaller than the lower limit of conditional expression (7), lateral chromatic aberration is undesirably lower.
【００６２】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は物体側より順に第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、非球
面形状はレンズ面の中心部の曲率半径Ｒとし、光軸方向
（光の進行方向）をＸ軸とし、光軸と垂直方向をＹ軸、
Ｂ，Ｃ，Ｄ，Ｅを各々非球面係数としたときNext, numerical examples of the present invention will be described. In the numerical examples, Ri is the radius of curvature of the ith lens surface in order from the object side, Di is the ith lens thickness and air spacing in order from the object side, and Ni and νi are the ith lens in order from the object side. Are the refractive index and Abbe number of the glass. The aspherical shape has a radius of curvature R at the center of the lens surface, the optical axis direction (the traveling direction of light) is the X axis, the direction perpendicular to the optical axis is the Y axis,
When B, C, D and E are each aspheric coefficients
【００６３】[0063]
【数５】 なる式で表している。又「Ｅ−０Ｘ」は「×１０-X」を
意味している。また前述の各条件式と数値実施例におけ
る諸数値との関係を表−１に示す。(Equation 5) This is represented by “E-0X” means “× 10 −X ”. Table 1 shows the relationship between the above-described conditional expressions and various numerical values in the numerical examples.
【００６４】また、数値実施例１，３におけるＲ２６，
Ｒ２７は保護ガラス部、Ｒ２４〜Ｒ２７は色分解プリズ
ム、光学フィルター、フェースプレート等のガラスブロ
ックを示す。In addition, R26,
R27 denotes a protective glass part, and R24 to R27 denote glass blocks such as a color separation prism, an optical filter, and a face plate.
【００６５】[0065]
【外１】 [Outside 1]
【００６６】[0066]
【外２】 [Outside 2]
【００６７】[0067]
【外３】 [Outside 3]
【００６８】[0068]
【表１】 [Table 1]
【００６９】[0069]
【発明の効果】本発明によれば以上のように、各要素を
設定することによりリヤーフォーカス方式を採用しつ
つ、像面側に色分解プリズムや光学フィルター等を配置
することができる程度の長いバックフォーカスを有し、
又ズームレンズ全体が振動で傾いたときに発生する撮影
画像の像ブレを偏心収差の発生量を小さく押えつつ良好
に補正し、かつ大口径比で、変倍比１６倍と高変倍比を
有し、広角端から望遠端に至る全変倍範囲にわたり、又
無限遠物体から超至近物体に至る物体距離全般にわた
り、良好なる光学性能が得られる防振機能を有したリヤ
ーフォーカス式のズームレンズ及びそれを用いた撮像装
置を達成することができる。According to the present invention, as described above, by setting each element, the color separation prism and the optical filter can be arranged on the image plane side while adopting the rear focus method. Has a back focus,
In addition, image blurring of a photographed image that occurs when the entire zoom lens is tilted due to vibration is corrected satisfactorily while keeping the amount of eccentric aberration small, and a large aperture ratio, a zoom ratio of 16 and a high zoom ratio. A rear-focusing zoom lens with a vibration-proof function that provides good optical performance over the entire zoom range from the wide-angle end to the telephoto end, and over the entire object distance from the object at infinity to the very close object And an imaging device using the same.
【図１】本発明の防振機能を有したリヤーフォーカス式
のズームレンズを有した撮像装置の実施形態１の要部断
面図FIG. 1 is a cross-sectional view of a main part of a first embodiment of an imaging apparatus having a rear focus type zoom lens having a vibration reduction function according to the present invention.
【図２】本発明の防振機能を有したリヤーフォーカス式
のズームレンズを有した撮像装置の実施形態１の広角端
の収差図FIG. 2 is an aberration diagram of a first embodiment of an imaging apparatus having a rear focus zoom lens having a vibration reduction function according to the present invention at a wide angle end.
【図３】本発明の防振機能を有したリヤーフォーカス式
のズームレンズを有した撮像装置の実施形態１の中間の
収差図FIG. 3 is an intermediate aberration diagram of Embodiment 1 of the imaging apparatus including the rear focus zoom lens having the vibration reduction function of the present invention.
【図４】本発明の防振機能を有したリヤーフォーカス式
のズームレンズを有した撮像装置の実施形態１の望遠端
の収差図FIG. 4 is an aberration diagram at a telephoto end of Embodiment 1 of the imaging apparatus including the rear-focusing zoom lens having a vibration reduction function according to the present invention;
【図５】本発明の防振機能を有したリヤーフォーカス式
のズームレンズを有した撮像装置の実施形態２の要部断
面図FIG. 5 is a sectional view of a main part of a second embodiment of an imaging apparatus having a rear focus type zoom lens having a vibration reduction function according to the present invention;
【図６】本発明の防振機能を有したリヤーフォーカス式
のズームレンズを有した撮像装置の実施形態２の広角端
の収差図FIG. 6 is an aberration diagram at a wide angle end according to a second embodiment of the imaging apparatus including the rear focus zoom lens having the vibration reduction function of the present invention;
【図７】本発明の防振機能を有したリヤーフォーカス式
のズームレンズを有した撮像装置の実施形態２の中間の
収差図FIG. 7 is an intermediate aberration diagram of Embodiment 2 of the imaging apparatus having the rear-focusing type zoom lens having the vibration reduction function of the present invention.
【図８】本発明の防振機能を有したリヤーフォーカス式
のズームレンズを有した撮像装置の実施形態２の望遠端
の収差図FIG. 8 is an aberration diagram at a telephoto end according to a second embodiment of the imaging apparatus including the rear focus zoom lens having the vibration reduction function of the present invention;
【図９】本発明の防振機能を有したリヤーフォーカス式
のズームレンズを有した撮像装置の実施形態３の要部断
面図FIG. 9 is a sectional view of a main part of a third embodiment of an imaging apparatus having a rear focus type zoom lens having a vibration reduction function according to the present invention;
【図１０】本発明の防振機能を有したリヤーフォーカス
式のズームレンズを有した撮像装置の実施形態３の広角
端の収差図FIG. 10 is an aberration diagram at a wide-angle end of an imaging device according to a third embodiment of the present invention that includes a rear-focusing type zoom lens having a vibration reduction function.
【図１１】本発明の防振機能を有したリヤーフォーカス
式のズームレンズを有した撮像装置の実施形態３の中間
の収差図FIG. 11 is an intermediate aberration diagram of Embodiment 3 of the imaging apparatus including the rear-focusing type zoom lens having the vibration reduction function of the present invention.
【図１２】本発明の防振機能を有したリヤーフォーカス
式のズームレンズを有した撮像装置の実施形態３の望遠
端の収差図FIG. 12 is an aberration diagram at a telephoto end of an image pickup apparatus including a rear-focus type zoom lens having a vibration reduction function according to a third embodiment of the present invention.
【図１３】本発明の防振機能を有したリヤーフォーカス
式のズームレンズを有した撮像装置の光路説明図FIG. 13 is an explanatory diagram of an optical path of an image pickup apparatus having a rear focus type zoom lens having a vibration reduction function according to the present invention.
【図１４】本発明に係る可変頂角プリズムの説明図FIG. 14 is an explanatory view of a variable apex angle prism according to the present invention.
Ｌ１ 第１群 Ｌ２ 第２群 Ｌ３ 第３群 Ｌ４ 第４群 ＳＰ 絞り ＩＰ 像面 ｄ ｄ線 ｇ ｇ線 Ｓ サジタル像面 Ｍ メリディオナル像面 ＧＡ，ＧＢ ガラスブロック ＶＰ 可変頂角プリズム L1 First group L2 Second group L3 Third group L4 Fourth group SP Aperture IP Image plane d d-line g g-line S Sagittal image plane M Meridional image plane GA, GB Glass block VP Variable vertex angle prism
Claims (7)
の屈折力の第２群、開口絞り、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、該第
２群を像面側へ移動させて広角端から望遠端への変倍を
行い、変倍に伴う像面変動を該第４群の一部又は全部を
移動させて補正すると共に該第４群の一部又は全部を移
動させてフォーカスを行うズームレンズであって、該絞
りの近傍に可変頂角プリズムを設け、該可変頂角プリズ
ムのプリズム頂角を変化させることにより、該ズームレ
ンズが傾いたときに生ずる撮影画像の像ブレを補正して
おり、広角端のズーム位置における該第２群と第３群の
間隔、該開口絞りと該第３群の間隔を各々Ｄ２３Ｗ，Ｄ
Ｓ３Ｗとしたとき ０．１８＜ＤＳ３Ｗ／Ｄ２３Ｗ＜０．３７ 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
リヤーフォーカス式のズームレンズ。1. A first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. Moving the second group to the image plane side to perform zooming from the wide-angle end to the telephoto end, and moving a part or all of the fourth group to change the image plane due to zooming A zoom lens that focuses by moving a part or the whole of the fourth group while performing correction by providing a variable apex prism in the vicinity of the stop, and changing a prism apex angle of the variable apex prism. By doing so, the image blur of the captured image caused when the zoom lens is tilted is corrected, the distance between the second and third units at the zoom position at the wide-angle end, the distance between the aperture stop and the third unit. D23W, D
A rear-focusing zoom lens having an anti-vibration function, which satisfies the following condition: S3W: 0.18 <DS3W / D23W <0.37.
きの前記第４群から像面までの空気換算量をＢＦＷ、広
角端における全系の焦点距離、Ｆナンバー、そして半画
角を順にｆＷ，ＦＮＷ，ωｗとしたとき 【数１】 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
能を有したリヤーフォーカス式のズームレンズ。2. When the object at infinity is focused at the wide-angle end, the air conversion amount from the fourth lens unit to the image plane is BFW, the focal length of the entire system at the wide-angle end, the F-number, and the half angle of view are fW. , FNW, ωw 2. A rear focus type zoom lens having an anti-vibration function according to claim 1, wherein the following conditions are satisfied.
１つの非球面を有していることを特徴とする請求項１又
は２の防振機能を有したリヤーフォーカス式のズームレ
ンズ。3. The rear focus type zoom lens having a vibration reduction function according to claim 1, wherein said third group or said fourth group has at least one aspherical surface.
力の接合レンズを有していることを特徴とする請求項
１，２又は３の防振機能を有したリヤーフォーカス式の
ズームレンズ。4. A rear-focusing type zoom lens having an anti-vibration function according to claim 1, wherein said fourth group includes at least one cemented lens having a positive refractive power. .
おける全系のＦナンバーと焦点距離を各々ＦＮＷ，ｆ
Ｗ、望遠端における全系の焦点距離をｆＴとし、 【数２】 とおいたとき ０．６２＜｜ｆ２｜×ＦＮＷ／ｆＭ＜０．８３ なる条件を満足することを特徴とする請求項１，２の防
振機能を有したリヤーフォーカス式のズームレンズ。5. The focal length of the second lens unit is f2, and the F-number and focal length of the entire system at the wide-angle end are FNW and fN, respectively.
W, the focal length of the entire system at the telephoto end is fT, and 3. A rear-focusing type zoom lens having an anti-vibration function according to claim 1, wherein the following condition is satisfied: 0.62 <| f2 | × FNW / fM <0.83.
振機能を有したリヤーフォーカス式のズームレンズ。6. The anti-vibration function according to claim 1, wherein a condition of 0.16 <| f2 / f1 | <0.2 is satisfied when a focal length of the i-th lens unit is fi. Rear focus zoom lens.
振機能を有したリヤーフォーカス式のズームレンズとそ
の像面側に色分解光学系を有していることを特徴とする
撮像装置。7. An image pickup apparatus comprising: a rear focus type zoom lens having an image stabilizing function according to claim 1; and a color separation optical system on an image plane side thereof. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9215722A JPH1144845A (en) | 1997-07-25 | 1997-07-25 | Rear focus type zoom lens provided with vibration-proof function and image pickup device using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9215722A JPH1144845A (en) | 1997-07-25 | 1997-07-25 | Rear focus type zoom lens provided with vibration-proof function and image pickup device using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1144845A true JPH1144845A (en) | 1999-02-16 |
Family
ID=16677105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9215722A Pending JPH1144845A (en) | 1997-07-25 | 1997-07-25 | Rear focus type zoom lens provided with vibration-proof function and image pickup device using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1144845A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001228395A (en) * | 2000-02-18 | 2001-08-24 | Canon Inc | Rear focus type zoom lens and optical equipment using the same |
| EP1643285A1 (en) * | 2004-09-30 | 2006-04-05 | Sony Corporation | Zoom lens having five lens groups |
| US7542212B2 (en) | 2006-06-01 | 2009-06-02 | Sony Corporation | Zoom lens and image capture apparatus |
| US7742231B2 (en) | 2006-06-15 | 2010-06-22 | Sony Corporation | Zoom lens and imaging apparatus |
| JP2011070221A (en) * | 2010-12-20 | 2011-04-07 | Fujifilm Corp | Variable magnification optical system with vibration-proof function and imaging device incorporating the variable magnification optical system |
| JP2013037063A (en) * | 2011-08-04 | 2013-02-21 | Canon Inc | Zoom lens and imaging apparatus including the same |
-
1997
- 1997-07-25 JP JP9215722A patent/JPH1144845A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001228395A (en) * | 2000-02-18 | 2001-08-24 | Canon Inc | Rear focus type zoom lens and optical equipment using the same |
| JP4593716B2 (en) * | 2000-02-18 | 2010-12-08 | キヤノン株式会社 | Rear focus zoom lens and optical apparatus using the same |
| EP1643285A1 (en) * | 2004-09-30 | 2006-04-05 | Sony Corporation | Zoom lens having five lens groups |
| US7116489B2 (en) | 2004-09-30 | 2006-10-03 | Sony Corporation | Zoom lens and imaging device |
| US7542212B2 (en) | 2006-06-01 | 2009-06-02 | Sony Corporation | Zoom lens and image capture apparatus |
| US7742231B2 (en) | 2006-06-15 | 2010-06-22 | Sony Corporation | Zoom lens and imaging apparatus |
| US7911697B2 (en) | 2006-06-15 | 2011-03-22 | Sony Corporation | Zoom lens and imaging apparatus |
| JP2011070221A (en) * | 2010-12-20 | 2011-04-07 | Fujifilm Corp | Variable magnification optical system with vibration-proof function and imaging device incorporating the variable magnification optical system |
| JP2013037063A (en) * | 2011-08-04 | 2013-02-21 | Canon Inc | Zoom lens and imaging apparatus including the same |
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