JP4378008B2 - Anti-shake zoom lens - Google Patents
Anti-shake zoom lens Download PDFInfo
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- JP4378008B2 JP4378008B2 JP36530899A JP36530899A JP4378008B2 JP 4378008 B2 JP4378008 B2 JP 4378008B2 JP 36530899 A JP36530899 A JP 36530899A JP 36530899 A JP36530899 A JP 36530899A JP 4378008 B2 JP4378008 B2 JP 4378008B2
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- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
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- 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
- G02B15/1445—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 negative
- G02B15/144511—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 negative arranged -+-+
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- 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
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Description
【０００１】
【発明が属する技術分野】
本発明は、ズームレンズに関し、特に、振動による撮影画像のぶれを補正する機能を有するズームレンズに関する。
【０００２】
【従来の技術】
従来、一眼レフカメラ用のズームレンズとして、物体側から順に負・正・負・正の屈折力配置を有する光学系が知られている。このタイプのズームレンズは、負群先行、所謂ネガティブリードであることから広角端を広画角にするのに適している一方で、望遠端では第１レンズ群と第２レンズ群が全体として正のグループ、第３レンズ群と第４レンズ群が全体として負のグループを構成し、光学系全体として所謂テレフォトタイプとできることから望遠端も長焦点化し易いというメリットを有している。このネガティブリードタイプのズームレンズは、たとえば、特開平４−１６３４１５号公報、特開平５−２４１０７３号公報、特開昭５８−９５３１５号公報、特開昭５８−９５３１５号公報、特開平５−１９１７０号公報、特開平６−８２６９８号公報、特開平７−２８７１６８号公報に開示されている。又、ネガティブリードタイプのズームレンズにおいて、撮影画像の変位を補正する機能を有する光学系が、たとえば、特開平７−１５２００２号公報、特開平１０−３９２１０号公報に開示されている。
【０００３】
図１９に示すように、たとえば、特開平１０−３９２１０号公報に開示されたズームレンズにおいては、第３レンズ群Ｇ３は、前群Ｇ３Ｆと後群Ｇ３Ｒとから成る。特に、前群Ｇ３Ｆは、その一つの面ｒ１７を非球面とする貼り合わせレンズである。そして、前群Ｇ３Ｆを光軸を横切る方向に移動可能に配置して防振補正を行わせている。
【０００４】
【発明が解決しようとする課題】
一般に、撮影画像の変位を補正する機能を有する光学系を構成する際、まず変位補正時の画質の劣化を十分に少なくするように構成することが必要とされる。
【０００５】
又、装置全体をコンパクトかつローコストにするためには、駆動装置の簡素化のために駆動量を十分に少なくすることや、画像変位補正光学系の小型化、軽量化が必要である。
【０００６】
しかし、従来の画像変位補正光学系は、複雑且つ大型であるため、装置全体のコンパクト化やローコスト化には不適当であった。
【０００７】
そこで、本発明は、物体側から順に負・正・負・正の屈折力配置の光学系において、撮影画像の変位を補正する機能をもたせ、且つ装置全体をコンパクトにすることを課題としている。
【０００８】
【課題を解決するための手段】
上記の課題を解決するための本発明のズームレンズは、物体側より像側へ順に、負の屈折力の第１レンズ群と、正の屈折力の第２レンズ群と、負の屈折力の第３レンズ群と、正の屈折力の第４レンズ群より構成され、広角から望遠への変倍の際、前記第１レンズ群は像側へ凸の軌跡で移動し、前記第２レンズ群は前記第１レンズ群との間隔を小とするように物体側へ移動し、前記第３レンズ群は前記第２レンズ群との間隔を大とするように物体側へ移動し、前記第４レンズ群は前記第３レンズ群との間隔を小とするように物体側へ移動し、前記第３レンズ群を光軸方向と垂直な成分を持つように移動させることによって結像位置を変位させるズームレンズであって、前記第３レンズ群は単レンズで構成されており、第ｉレンズ群の焦点距離をｆｉ、広角端におけるレンズ全系の焦点距離をｆｗとしたとき、
１．５＜｜ｆ３／ｆｗ｜＜５．０
２．０＜｜ｆ３／ｆ２｜＜５．０
３．５＜｜ｆ４／ｆｗ｜＜１５．０
なる条件式を満足することを特徴としている。
【０００９】
【発明の実施の形態】
本発明においては、物体側から順に負・正・負・正の屈折力配置としているので、第２レンズ群により収斂された光束が第３レンズ群に入射する。第３レンズ群は小型化が比較的容易であり、画像変位補正群として好適である。本発明では前記第３レンズ群を単レンズとすることで、画像変位補正群を軽量化している。
【００１０】
又、第３レンズ群に非球面を配置することで、基準状態すなわち画像変位補正していない状態の望遠端における球面収差の補正を行っている。従って、変位補正時の収差特性の劣化も少なくなる。第３レンズ群は、レンズ周辺にむかって負の屈折力が弱くなるような非球面形状にするとよい。
【００１１】
又、第３レンズ群をプラスティックレンズとすることで、画像変位補正群の軽量化がさらに容易となる。望ましくは、前記プラスティックの材料をアクリルやポリオレフィン系等の樹脂にすれば、ポリカーボネート等の樹脂に比べて低分散であることから、軸上色収差の補正が容易となる。
【００１２】
又、第ｉレンズ群の焦点距離をｆｉ，広角端におけるレンズ全系の焦点距離をｆｗとしたとき、以下の式（１）を満足させるとよい。
【００１３】
１．５＜｜ｆ３／ｆｗ｜＜５．０ （１）
撮影画像の変位を補正する機能を有するズームレンズの場合、画像変位補正群は変位補正時の画質の劣化を十分に少なくすると同時に、ズームレンズの変倍群としての機能を有する必要がある。特に本発明においては、画像変位補正群である第３レンズ群が単レンズであるので、屈折力配置には特別の注意をはらう必要がある。
【００１４】
式（１）の上限をこえると、望遠端で第３レンズ群と第４レンズ群の合成屈折力を十分な負の屈折力にすることが困難となり、テレフォトタイプの屈折力配置をとりずらくなることから、望遠端で明るいＦナンバーを確保することが困難となる。一方、式（１）の下限を越えると、焦点距離全域にわたって特にコマ収差と歪曲収差の補正が困難となる。
【００１５】
更に望ましくは、以下の式（２）を満足させるとよい。
【００１６】
２．０＜｜ｆ３／ｆｗ｜＜４．０ （２）
更に、第２レンズ群、第３レンズ群、第４レンズ群の焦点距離を以下の式（３）及び式（４）によって定めるとよい。
【００１７】
２．０＜｜ｆ３／ｆ２｜＜５．０ （３）
３．５＜｜ｆ４／ｆｗ｜＜１５．０ （４）
式（３）は第２レンズ群と第３レンズ群の屈折力の割合を設定したものであり、上限をこえると広角側で第２レンズ群と第３レンズ群の合成屈折力が、レトロフォーカスタイプの後群として適切な正の屈折力とすることが困難となり、その結果広角端における像面湾曲及びコマ収差の補正が困難となる。下限をこえると必要な変倍比を確保するのが困難となったり、望遠端でテレフォトタイプの屈折力配置をとりずらくなることから、望遠端で明るいＦナンバーを確保することが困難となる。
【００１８】
式（４）は第４レンズ群の焦点距離を適切に設定したものであり、上限を外れると広角側でバックフォーカスの確保が困難となり、下限を外れると、特に望遠端で画像変位補正のための第３レンズ群の駆動量を小さくすることが困難となる。
【００１９】
さらに望ましくは、第２レンズ群、第３レンズ群、第４レンズ群の焦点距離を以下の式（５）及び式（６）によって定めるとよい。
【００２０】
２．０＜｜ｆ３／ｆ２｜＜３．５ （５）
３．５＜｜ｆ４／ｆｗ｜＜１４．０ （６）
【００２１】
【実施例】
図１は、数値実施例１から数値実施例５までの５つの実施例を示す表である。いずれの実施例も式（１）から式（６）までの６つの式をすべて満足させている。
【００２２】
図２は、数値実施例１から数値実施例４までの４つの実施例のズームレンズの変倍動作を説明するための図である。図２０、図２１、図２２、図２３は数値実施例１から数値実施例４のズームレンズの広角端におけるレンズ断面図である。ＬＩは負の第１レンズ群、ＬＩＩは正の第２レンズ群、ＬＩＩＩは負の第３レンズ群、ＬＩＶは正の第４レンズ群、ＳＰは絞り、ＦＣはフレアーカッター、ＩＰは像面である。物体側から順に、ＬＩは物体側に凸の負メニスカスレンズ、両凹レンズ、物体側に凸の正メニスカスレンズ、ＬＩＩは両凸レンズ、物体側に凸の負メニスカスレンズと物体側に凸の正メニスカスレンズの接合レンズ、ＳＰはＬＩＩＩの物体側に配置され、ＬＩＩＩは両凹レンズ、ＬＩＶは像側に凸の負メニスカスレンズ、像側に凸の正メニスカスレンズで構成されており、ＬＩＶの負メニスカスレンズはポリカーボネートの非球面レンズである。
【００２３】
広角から望遠への変倍の際、ＬＩは像側に凸の軌跡で移動、ＬＩＩ、ＬＩＩＩ、ＬＩＶは物体側へ移動しており、ＳＰはＬＩＩＩと一体で移動している。
【００２４】
近距離へのフォーカシングは第１レンズ群ＬＩを物体側へ移動させて行う。
【００２５】
又、画像変位補正時には、ＬＩＩＩを光軸と略垂直方向に、言い換えると、垂直な成分を持つように移動させる。
【００２６】
図３は、数値実施例５のズームレンズの広角端におけるレンズ断面図である。
【００２７】
ＬＩは、物体側より順に、物体側に凸の負メニスカスレンズ、物体側に凸の負メニスカスレンズ、物体側に凸の正メニスカスレンズである。
【００２８】
ＬＩＩ、ＬＩＩＩ、ＬＩＶの構成、各レンズ群の移動および相対位置関係は各数値実施例１、２、３、４と同様である。
【００２９】
表１から表５には、それぞれ数値実施例１から数値実施例５における各面の曲率半径Ｒ、面間距離Ｄ、屈折率ｎ、アッベ数νを示す。各表において、Ｒｉ、Ｄｉは、それぞれ物体側より順に第ｉ番目の面の曲率半径、面間距離であり、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、ωは光軸に対する入射角、２ωは全画角（度）、ωは半画角である。ｆはズームレンズの焦点距離、ＦｎｏはズームレンズのＦナンバーである。
【００３０】
各表の非球面係数中に、たとえば、「Ｃ＝３．７１６３９ｅ−０８」とあるのは、「Ｃ＝３．７１６３９×１０-8」の意味である。
【００３１】
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、以下の式で表される。
【００３２】
【数１】
【表１】
【表２】
【表３】
【表４】
【表５】
【００３８】
球面収差ｓｐｈ曲線の内、実線はｄ線に、２点鎖線はｇ線に、点線は正弦条件に、それぞれ対応する。
【００３９】
非点収差ａｓ曲線の内、実線はサジタル像面Ｓに、点線はメリジオナル像面に、それぞれ対応する。
【００４０】
又、これらの各図においては、ＬＩＩＩが基準位置にある場合の横収差（倍率色収差ｃｈｒｏ）、及び、結像位置を補正するために第３レンズＬＩＩＩを移動した後の横収差も示されている。具体的には、第３レンズ群を光軸と略垂直に、言換えると垂直な成分を持つように移動させ、無限距離物体を０．５°の画角に相当する画像変位を行ったときの横収差図であり、像高が０．００，±１０．００、±１５．００、±１８．００、±２１．６４の場合についての横収差図である。
【００４１】
横収差曲線の内、実線はメリジオナル像面でのｄ線に、２点鎖線はメリジオナル像面でのｇ線に、点線はサジタル像面でのｄ線に、それぞれ対応する。
【００４２】
【発明の効果】
以上説明した本発明によれば、光学系の一部のレンズ群を光軸と略垂直に、言換えると、垂直な成分を持つように移動させることにより、撮影画像の変位を補正する機能をもたせ、且つ装置全体のコンパクト化、ローコスト化を可能としたズームレンズを提供できる。
【図面の簡単な説明】
【図１】 本発明のズームレンズの数値実施例をまとめた表
【図２】 本発明のズームレンズの変倍動作を説明するためのレンズ群の配置図
【図３】 数値実施例５のズームレンズの広角端におけるレンズ断面図
【図４】 数値実施例１の広角端での収差曲線
【図５】 数値実施例１の中間焦点距離での収差曲線
【図６】 数値実施例１の望遠端での収差曲線
【図７】 数値実施例２の広角端での収差曲線
【図８】 数値実施例２の中間焦点距離での収差曲線
【図９】 数値実施例２の望遠端での収差曲線
【図１０】 数値実施例３の広角端での収差曲線
【図１１】 数値実施例３の中間焦点距離での収差曲線
【図１２】 数値実施例３の望遠端での収差曲線
【図１３】 数値実施例４の広角端での収差曲線
【図１４】 数値実施例４の中間焦点距離での収差曲線
【図１５】 数値実施例４の望遠端での収差曲線
【図１６】 数値実施例５の広角端での収差曲線
【図１７】 数値実施例５の中間焦点距離での収差曲線
【図１８】 数値実施例５の望遠端での収差曲線
【図１９】 従来のネガティブリードの防振ズームレンズのレンズ構成図
【図２０】 数値実施例１のズームレンズの広角端におけるレンズ断面図
【図２１】 数値実施例２のズームレンズの広角端におけるレンズ断面図
【図２２】 数値実施例３のズームレンズの広角端におけるレンズ断面図
【図２３】 数値実施例４のズームレンズの広角端におけるレンズ断面図
【符号の説明】
ＬＩ,ＬＩＩ,ＬＩＩＩ,ＬＩＶ それぞれ第１,２,３,４レンズ群
ＳＰ 絞り
ＦＣ フレアーカッター
ＩＰ 像面[0001]
[Technical field to which the invention belongs]
The present invention relates to a zoom lens, and more particularly to a zoom lens having a function of correcting blurring of a captured image due to vibration.
[0002]
[Prior art]
Conventionally, as a zoom lens for a single-lens reflex camera, an optical system having negative, positive, negative, and positive refractive power arrangements in order from the object side is known. This type of zoom lens is suitable for a wide angle of view at the wide-angle end because it is a negative group leading, so-called negative lead, while the first lens group and the second lens group as a whole are positive at the telephoto end. This group, the third lens group and the fourth lens group form a negative group as a whole, and the entire optical system can be of a so-called telephoto type. This negative lead type zoom lens is disclosed in, for example, JP-A-4-163415, JP-A-5-241073, JP-A-58-95315, JP-A-58-95315, JP-A-5-19170. No. 6-82698 and JP-A-7-287168. In addition, in a negative lead type zoom lens, an optical system having a function of correcting displacement of a captured image is disclosed in, for example, Japanese Patent Application Laid-Open Nos. 7-152002 and 10-39210.
[0003]
As shown in FIG. 19, for example, in the zoom lens disclosed in Japanese Patent Application Laid-Open No. 10-39210, the third lens group G3 includes a front group G3F and a rear group G3R. In particular, the front group G3F is a bonded lens whose one surface r17 is an aspherical surface. Then, the front group G3F is arranged so as to be movable in a direction crossing the optical axis to perform the image stabilization correction.
[0004]
[Problems to be solved by the invention]
In general, when configuring an optical system having a function of correcting the displacement of a captured image, it is first necessary to configure so as to sufficiently reduce the deterioration of image quality when the displacement is corrected.
[0005]
Further, in order to make the entire apparatus compact and low cost, it is necessary to sufficiently reduce the driving amount in order to simplify the driving device, and to reduce the size and weight of the image displacement correction optical system.
[0006]
However, since the conventional image displacement correction optical system is complicated and large, it is not suitable for downsizing and cost reduction of the entire apparatus.
[0007]
Therefore, the present invention has an object to provide a function of correcting displacement of a photographed image and to make the entire apparatus compact in an optical system having negative, positive, negative, and positive refractive power arrangement in order from the object side.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a zoom lens according to the present invention includes, in order from the object side to the image side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a negative refractive power. The second lens group includes a third lens group and a fourth lens group having a positive refractive power, and the first lens group moves along a locus convex toward the image side during zooming from wide angle to telephoto. Moves to the object side so as to make the distance from the first lens group small, and the third lens group moves to the object side so as to make the distance from the second lens group large. The lens group is moved to the object side so that the distance from the third lens group is small, and the imaging position is displaced by moving the third lens group so as to have a component perpendicular to the optical axis direction. In the zoom lens, the third lens group is a single lens, and the focal length of the i-th lens group is i, when the focal length of the entire lens system at the wide angle end is set to fw,
1.5 <| f3 / fw | <5.0
2.0 <| f3 / f2 | <5.0
3.5 <| f4 / fw | <15.0
It satisfies the following conditional expression .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, since the negative, positive, negative, and positive refractive power arrangements are made in order from the object side, the light beam converged by the second lens group enters the third lens group. The third lens group is relatively easy to downsize and is suitable as an image displacement correction group. In the present invention, the third lens group is a single lens, thereby reducing the weight of the image displacement correction group.
[0010]
Further, by arranging an aspherical surface in the third lens group, the spherical aberration at the telephoto end in the reference state, that is, the state where the image displacement is not corrected is corrected. Therefore, the deterioration of the aberration characteristics at the time of displacement correction is reduced. The third lens group may be aspherical so that the negative refractive power decreases toward the periphery of the lens.
[0011]
Further, by making the third lens group a plastic lens, the weight reduction of the image displacement correction group is further facilitated. Desirably, if the plastic material is an acrylic or polyolefin resin, the dispersion is lower than that of a resin such as polycarbonate, so that it is easy to correct longitudinal chromatic aberration.
[0012]
Further, when the focal length of the i-th lens group is fi and the focal length of the entire lens system at the wide-angle end is fw, the following expression (1) should be satisfied.
[0013]
1.5 <| f3 / fw | <5.0 (1)
In the case of a zoom lens having a function of correcting the displacement of a photographed image, the image displacement correction group needs to have a function as a zoom lens zooming group at the same time as sufficiently reducing deterioration in image quality during displacement correction. Particularly in the present invention, since the third lens group is an image displacement correction group is a single lens, it is necessary to pay special attention to the refractive power arrangement.
[0014]
If the upper limit of the expression (1) is exceeded, it becomes difficult to make the combined refractive power of the third lens group and the fourth lens group at the telephoto end sufficiently negative, and the telephoto type refractive power arrangement is not taken. Therefore, it becomes difficult to secure a bright F number at the telephoto end. On the other hand, if the lower limit of equation (1) is exceeded, it will be difficult to correct coma and distortion, especially over the entire focal length.
[0015]
More preferably, the following expression (2) should be satisfied.
[0016]
2.0 <| f3 / fw | <4.0 (2)
Further, the focal lengths of the second lens group, the third lens group, and the fourth lens group may be determined by the following expressions (3) and (4).
[0017]
2.0 <| f3 / f2 | <5.0 (3)
3.5 <| f4 / fw | <15.0 (4)
Expression (3) sets the ratio of the refractive powers of the second lens group and the third lens group. If the upper limit is exceeded, the combined refractive power of the second lens group and the third lens group at the wide-angle side becomes the retrofocus. It becomes difficult to obtain an appropriate positive refractive power as a rear group of the type, and as a result, it becomes difficult to correct curvature of field and coma at the wide angle end. Exceeding the lower limit makes it difficult to secure the required zoom ratio, and telephoto type refractive power arrangement becomes difficult at the telephoto end, making it difficult to secure a bright F number at the telephoto end. Become.
[0018]
Expression (4) is an appropriate setting of the focal length of the fourth lens group. If the upper limit is deviated, it becomes difficult to ensure the back focus on the wide-angle side, and if the lower limit is deviated, the image displacement is corrected particularly at the telephoto end. It is difficult to reduce the driving amount of the third lens group.
[0019]
More preferably, the focal lengths of the second lens group, the third lens group, and the fourth lens group may be determined by the following equations (5) and (6).
[0020]
2.0 <| f3 / f2 | <3.5 (5)
3.5 <| f4 / fw | <14.0 (6)
[0021]
【Example】
FIG. 1 is a table showing five examples from Numerical Example 1 to Numerical Example 5 . All the examples satisfy all the six expressions from Expression (1) to Expression (6).
[0022]
FIG. 2 is a diagram for explaining the zooming operation of the zoom lenses of the four examples from Numerical Example 1 to Numerical Example 4. FIG. 20, 21, 22, and 23 are lens cross-sectional views at the wide-angle end of the zoom lenses according to Numerical Example 1 to Numerical Example 4. FIG. LI is a negative first lens group, LII is a positive second lens group, LIII is a negative third lens group, LIV is a positive fourth lens group, SP is an aperture, FC is a flare cutter, and IP is an image plane is there. In order from the object side, LI is a negative meniscus lens convex to the object side, a biconcave lens, a positive meniscus lens convex to the object side, LII is a biconvex lens, a negative meniscus lens convex to the object side, and a positive meniscus lens convex to the object side. SP is arranged on the object side of LIII, LIII is a biconcave lens, LIV is composed of a negative meniscus lens convex on the image side, and a positive meniscus lens convex on the image side, and the negative meniscus lens of LIV is Polycarbonate aspherical lens.
[0023]
During zooming from wide angle to telephoto, LI moves along a locus convex toward the image side, LII, LIII, and LIV move toward the object side, and SP moves together with LIII.
[0024]
Focusing to a short distance is performed by moving the first lens unit LI to the object side.
[0025]
At the time of image displacement correction, LIII is moved in a direction substantially perpendicular to the optical axis, in other words, having a vertical component.
[0026]
FIG. 3 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Numerical Example 5.
[0027]
LI is a negative meniscus lens convex toward the object side, a negative meniscus lens convex toward the object side, and a positive meniscus lens convex toward the object side in order from the object side.
[0028]
The configurations of LII, LIII, and LIV, the movement of each lens group, and the relative positional relationship are the same as those in Numerical Examples 1, 2, 3, and 4.
[0029]
Tables 1 to 5 show the curvature radius R,
[0030]
In the aspheric coefficient of each table, for example, “C = 3.761639e−08” means “C = 3.761639 × 10 −8 ”.
[0031]
The aspherical shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the light traveling direction is positive, R is the paraxial radius of curvature, and A, B, C, D and E are the aspheric coefficients. Is expressed by the following formula.
[0032]
[Expression 1]
[Table 1]
[Table 2]
[Table 3]
[Table 4]
[Table 5]
[0038]
In the spherical aberration sph curve, the solid line corresponds to the d line, the two-dot chain line corresponds to the g line, and the dotted line corresponds to the sine condition.
[0039]
Of the astigmatism as curve, the solid line corresponds to the sagittal image plane S, and the dotted line corresponds to the meridional image plane.
[0040]
Also, in each of these drawings, the lateral aberration when the LIII is at the reference position (the lateral chromatic aberration chrom) and the lateral aberration after the third lens LIII is moved to correct the imaging position are also shown. Yes. Specifically, when the third lens unit is moved to be substantially perpendicular to the optical axis, in other words, to have a vertical component, and an infinite distance object is subjected to image displacement corresponding to an angle of view of 0.5 °. FIG. 4 is a lateral aberration diagram for the cases where the image height is 0.00, ± 10.00, ± 15.00, ± 18.00, and ± 21.64.
[0041]
In the transverse aberration curve, the solid line corresponds to the d line on the meridional image plane, the two-dot chain line corresponds to the g line on the meridional image plane, and the dotted line corresponds to the d line on the sagittal image plane.
[0042]
【The invention's effect】
According to the present invention described above, the function of correcting the displacement of the captured image by moving a part of the lens group of the optical system substantially perpendicular to the optical axis, in other words, having a vertical component. Therefore, it is possible to provide a zoom lens which can be made compact and low-cost as a whole.
[Brief description of the drawings]
FIG. 1 is a table summarizing numerical examples of the zoom lens of the present invention. FIG. 2 is an arrangement diagram of lens groups for explaining the zooming operation of the zoom lens of the present invention. Lens cross-sectional view at the wide-angle end of the lens [Fig. 4] Aberration curve at the wide-angle end of Numerical Example 1 [Fig. 5] An aberration curve at the intermediate focal length of Numerical Example 1 [Fig. 6] Telephoto end of Numerical Example 1 Aberration curve at the wide-angle end of Numerical Example 2 FIG. 8 Aberration curve at the intermediate focal length of Numerical Example 2 FIG. 9 Aberration curve at the telephoto end of Numerical Example 2 10 is an aberration curve at the wide angle end of Numerical Example 3. FIG. 11 is an aberration curve at an intermediate focal length of Numerical Example 3. FIG. 12 is an aberration curve at the telephoto end of Numerical Example 3. Aberration curve at wide angle end in Numerical Example 4 FIG. 14 shows aberration curves at the intermediate focal length in Numerical Example 4. 15 is an aberration curve at the telephoto end of Numerical Example 4. FIG. 16 is an aberration curve at the wide-angle end of Numerical Example 5. FIG. 17 is an aberration curve at the intermediate focal length of Numerical Example 5. FIG. Aberration curve at telephoto end in Numerical Example 5 FIG. 19 is a lens configuration diagram of a conventional negative lead anti-vibration zoom lens
20 is a lens cross-sectional view at the wide-angle end of the zoom lens according to Numerical Example 1. FIG.
FIG. 21 is a lens cross-sectional view at the wide-angle end of a zoom lens according to Numerical Example 2.
22 is a lens cross-sectional view at the wide-angle end of a zoom lens according to Numerical Example 3. FIG.
23 is a lens cross-sectional view at the wide-angle end of a zoom lens according to Numerical Example 4. DESCRIPTION OF SYMBOLS
LI, LII, LIII, LIV 1st, 2nd, 3rd and 4th lens groups SP Aperture FC Flare cutter IP Image surface
Claims (3)
１．５＜｜ｆ３／ｆｗ｜＜５．０
２．０＜｜ｆ３／ｆ２｜＜５．０
３．５＜｜ｆ４／ｆｗ｜＜１５．０
なる条件式を満足することを特徴とするズームレンズ。In order from the object side to the image side , a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. is more configuration, during zooming from the wide angle to the telephoto, such that the first lens unit moves with locus of a convex to the image side, the second lens group and a small distance between the first lens group Moving to the object side, the third lens group moves to the object side so as to increase the distance from the second lens group, and the fourth lens group decreases the distance from the third lens group. The zoom lens moves to the object side and displaces the imaging position by moving the third lens group so as to have a component perpendicular to the optical axis direction, and the third lens group is a single lens . The focal length of the i-th lens unit is fi, and the focal length of the entire lens system at the wide-angle end is fw. When,
1.5 <| f3 / fw | <5.0
2.0 <| f3 / f2 | <5.0
3.5 <| f4 / fw | <15.0
A zoom lens satisfying the following conditional expression:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36530899A JP4378008B2 (en) | 1999-12-22 | 1999-12-22 | Anti-shake zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36530899A JP4378008B2 (en) | 1999-12-22 | 1999-12-22 | Anti-shake zoom lens |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2001183585A JP2001183585A (en) | 2001-07-06 |
| JP2001183585A5 JP2001183585A5 (en) | 2007-02-01 |
| JP4378008B2 true JP4378008B2 (en) | 2009-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36530899A Expired - Fee Related JP4378008B2 (en) | 1999-12-22 | 1999-12-22 | Anti-shake zoom lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4672827B2 (en) * | 2000-01-28 | 2011-04-20 | 株式会社栃木ニコン | Zoom lens and projection display device including the zoom lens |
| JP4792779B2 (en) * | 2005-03-29 | 2011-10-12 | 株式会社ニコン | Zoom lens |
| JP4778736B2 (en) * | 2005-06-29 | 2011-09-21 | Ｈｏｙａ株式会社 | Wide-angle zoom lens system |
| JP5130806B2 (en) * | 2006-07-21 | 2013-01-30 | 株式会社ニコン | Magnification optical system, image pickup device, and magnifying optical system magnifying method |
| EP2045639A4 (en) | 2006-07-21 | 2012-06-13 | Nikon Corp | Variable power optical system, imaging device, method of varying magnification of variable power optical system |
| JP5082431B2 (en) * | 2006-12-25 | 2012-11-28 | 株式会社ニコン | Magnification optical system having image stabilization function, imaging device, and magnifying method |
| JP4885756B2 (en) | 2007-02-08 | 2012-02-29 | 株式会社リコー | Zoom lens, camera device, and portable information terminal device |
| US7974012B2 (en) | 2008-03-31 | 2011-07-05 | Nikon Corporation | Zoom lens system, optical device with the zoom lens system, and method of manufacturing the zoom lens system |
| US8259400B2 (en) | 2009-01-26 | 2012-09-04 | Nikon Corporation | Zoom lens system, imaging apparatus, and method for manufacturing zoom lens system |
| JP5251996B2 (en) * | 2011-01-21 | 2013-07-31 | 株式会社ニコン | Zoom lens |
| JP6260074B2 (en) * | 2012-08-30 | 2018-01-17 | 株式会社ニコン | Variable magnification optical system and optical apparatus having the variable magnification optical system |
| EP2741117B1 (en) * | 2012-12-04 | 2020-05-13 | Samsung Electronics Co., Ltd | Zoom lens and electronic device including the same |
| CN109188663B (en) * | 2013-06-28 | 2021-10-15 | 株式会社尼康 | Variable power optical system, optical apparatus, and method of manufacturing variable power optical system |
| JP2017021060A (en) * | 2013-11-26 | 2017-01-26 | 株式会社ニコン | Zoom lens system, optical device and zoom lens system manufacturing method |
| JP6372593B2 (en) * | 2017-05-31 | 2018-08-15 | リコーイメージング株式会社 | Zoom lens system and electronic imaging apparatus including the same |
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1999
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