JPH08304704A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPH08304704A JPH08304704A JP8020930A JP2093096A JPH08304704A JP H08304704 A JPH08304704 A JP H08304704A JP 8020930 A JP8020930 A JP 8020930A JP 2093096 A JP2093096 A JP 2093096A JP H08304704 A JPH08304704 A JP H08304704A
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- lens
- distance
- wide
- telephoto end
- 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
- 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
-
- 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
- G02B15/143—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 three groups only
- G02B15/1435—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 three groups only the first group being negative
- G02B15/143507—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 three groups only the first group being negative arranged -++
-
- 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
- G02B15/144507—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 -++-
-
- 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
- G02B15/145—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 five groups only
- G02B15/1455—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 five groups only the first group being negative
- G02B15/145523—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 five groups only the first group being negative arranged -++-+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はズームレンズの変倍方式
に関し、特にインナーフォーカス方式に適したズームレ
ンズの変倍方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens zooming system, and more particularly to a zoom lens zooming system suitable for an inner focus system.
【０００２】[0002]
【従来の技術】ズームレンズのフォーカシング方式は、
第１レンズ群を繰り出す、いわゆる１群繰り出し方式が
一般的である。この１群繰り出し方式は、同一距離の被
写体へのフォーカシングに要する第１レンズ群の繰り出
し量が、ズームポジションに依存しないという利点があ
り広く用いられている。2. Description of the Related Art Focusing systems for zoom lenses are
A so-called one-group moving-out method of moving out the first lens group is general. This one-group extension method is widely used because it has the advantage that the extension amount of the first lens group required for focusing on a subject at the same distance does not depend on the zoom position.
【０００３】また、第１レンズ群より像面側に位置する
レンズ群を移動させるインナーフォーカス方式、または
リアーフォーカス方式のズームレンズも特開昭５７−５
０１２号公報等で提案されている。Further, an inner focus type or rear focus type zoom lens for moving a lens unit positioned on the image plane side of the first lens unit is also disclosed in Japanese Patent Laid-Open No. 57-5.
No. 012 publication and the like are proposed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、１群繰
り出し方式では、比較的大きく重い第１レンズ群を動か
してフォーカシングを行うため、オートフォーカスを行
う場合のフォーカシング速度は、インナーフォーカス方
式やリアーフォーカス方式に比べて遅いという問題があ
った。また、最も外側のレンズ群が移動するため、防滴
または防水カメラには不向きであった。However, in the first group extension method, focusing is performed by moving the relatively large and heavy first lens group. Therefore, the focusing speed in performing autofocus is the inner focus method or the rear focus method. There was a problem that it was slow compared to. Further, since the outermost lens group moves, it is not suitable for a drip-proof or waterproof camera.
【０００５】一方、特開昭５７−５０１２号公報で提案
されているリアーフォーカス方式のズームレンズでは、
同一距離の被写体へのフォーカシングに要するフォーカ
シングレンズ群の繰り出し量が、ズームポジションによ
って大きく異なり、近距離物体にフォーカシングした後
にズーミングを行うと、ピントがはずれるという問題が
あった。On the other hand, in the rear focus type zoom lens proposed in Japanese Patent Laid-Open No. 57-5012,
There is a problem that the amount of extension of the focusing lens group required for focusing on a subject at the same distance greatly varies depending on the zoom position, and when focusing is performed on an object at a short distance and then zooming is performed, the focus is out of focus.
【０００６】本発明においては、インナーフォーカス方
式を採用しても、同一距離の被写体へのフォーカシング
に要するフォーカシングレンズ群の繰り出し量が、ズー
ムポジションによらずほぼ一定とすることが可能なズー
ムレンズの提供を目的としている。According to the present invention, even if the inner focus system is adopted, the amount of extension of the focusing lens group required for focusing on a subject at the same distance can be made substantially constant regardless of the zoom position. It is intended to be provided.
【０００７】[0007]
【課題を解決するための手段】本発明のズームレンズ
は、物体側から順に、負の屈折力を有する第１レンズ群
と、正の屈折力を有する第２レンズ群と、正の屈折力を
有する第３レンズ群からなり、広角端から望遠端へのズ
ーミングに際して、第１レンズ群が静止し、第２レンズ
群と第３レンズ群が物体方向に移動し、第２レンズ群と
第３レンズ群との間隔が変化し、さらに、広角端から望
遠端までのいずれの焦点距離状態においても、第２レン
ズ群の結像倍率が−１倍とならない構成である。A zoom lens according to the present invention has a first lens group having a negative refracting power, a second lens group having a positive refracting power, and a positive refracting power in order from the object side. The first lens group is stationary, the second lens group and the third lens group move in the object direction, and the second lens group and the third lens are configured to move during zooming from the wide-angle end to the telephoto end. The distance between the lens unit and the second lens unit changes, and the imaging magnification of the second lens unit does not become -1 in any focal length state from the wide-angle end to the telephoto end.
【０００８】あるいは、物体側から順に、負の屈折力を
有する第１レンズ群と、正の屈折力を有する第２レンズ
群と、正の屈折力を有する第３レンズ群を有し、広角端
から望遠端へのズーミングに際して、前記第１レンズ群
と第２レンズ群との間隔が変化し、前記第２レンズ群と
第３レンズ群との間隔が変化し、前記第２レンズ群を像
面方向に移動させて遠距離物体から近距離物体へのフォ
ーカシングを行う構成である。Alternatively, in order from the object side, a first lens group having a negative refracting power, a second lens group having a positive refracting power, and a third lens group having a positive refracting power are provided, and the wide-angle end is provided. From the telephoto end to the telephoto end, the distance between the first lens group and the second lens group changes, the distance between the second lens group and the third lens group changes, and the second lens group is changed to the image plane. It is configured to move in a direction to perform focusing from a long-distance object to a short-distance object.
【０００９】あるいは、物体側から順に、負の屈折力を
有する第１レンズ群と、正の屈折力を有する第２レンズ
群と、正の屈折力を有する第３レンズ群と、負の屈折力
を有する第４レンズ群とを有し、広角端から望遠端への
ズーミングに際して、第１レンズ群と第２レンズ群との
間隔が狭まり、第２レンズ群と第３レンズ群との間隔が
広がり、第３レンズ群と第４レンズ群との間隔が広がる
構成である。Alternatively, in order from the object 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 positive refractive power, and a negative refractive power. And a fourth lens group having a zoom lens, the distance between the first lens group and the second lens group is narrowed, and the distance between the second lens group and the third lens group is widened during zooming from the wide-angle end to the telephoto end. , The distance between the third lens group and the fourth lens group is widened.
【００１０】あるいは、物体側から順に、負の屈折力を
有する第１レンズ群と、正の屈折力を有する第２レンズ
群と、正の屈折力を有する第３レンズ群と、負の屈折力
を有する第４レンズ群とを有し、広角端から望遠端への
ズーミングに際して、第１レンズ群が静止し、第１レン
ズ群と第２レンズ群との間隔が狭まり、第２レンズ群と
第３レンズ群との間隔が変化し、第３レンズ群と第４レ
ンズ群との間隔が広がる構成である。Alternatively, in order from the object 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 positive refractive power, and a negative refractive power. And a fourth lens unit having a second lens unit, the first lens unit is stationary during zooming from the wide-angle end to the telephoto end, and the distance between the first lens unit and the second lens unit is narrowed. The distance between the third lens group and the third lens group changes, and the distance between the third lens group and the fourth lens group widens.
【００１１】あるいは、物体側から順に、負の屈折力を
有する第１レンズ群と、正の屈折力を有する第２レンズ
群と、正の屈折力を有する第３レンズ群と、負の屈折力
を有する第４レンズ群と、正の屈折力を有する第５レン
ズ群とを有し、広角端から望遠端へのズーミングに際し
て、第１レンズ群と第２レンズ群との間隔が狭まり、第
２レンズ群と第３レンズ群との間隔が変化し、第３レン
ズ群と第４レンズ群との間隔が広がり、第４レンズ群と
第５レンズ群の間隔が狭まる構成である。Alternatively, in order from the object side, the first lens group having a negative refractive power, the second lens group having a positive refractive power, the third lens group having a positive refractive power, and the negative refractive power. And a fifth lens group having a positive refracting power, the distance between the first lens group and the second lens group is narrowed during zooming from the wide-angle end to the telephoto end, and the second lens group The distance between the lens group and the third lens group changes, the distance between the third lens group and the fourth lens group increases, and the distance between the fourth lens group and the fifth lens group decreases.
【００１２】あるいは、物体側から順に、負の屈折力を
有する第１レンズ群と、正の屈折力を有する第２レンズ
群と、正の屈折力を有する第３レンズ群と、正の屈折力
を有する第４レンズ群を有し、広角端から望遠端へのズ
ーミングに際して、前記第１レンズ群と前記第２レンズ
群との間隔が縮小し、前記第２レンズ群と前記第３レン
ズ群との間隔が変化し、前記第３レンズ群と前記第４レ
ンズ群との間隔が変化し、前記第２レンズ群を像面方向
に移動させて遠距離物体から近距離物体へのフォーカシ
ングを行う構成である。Alternatively, in order from the object side, the first lens group having a negative refractive power, the second lens group having a positive refractive power, the third lens group having a positive refractive power, and the positive refractive power. And a fourth lens group having a second lens group, the distance between the first lens group and the second lens group is reduced during zooming from the wide-angle end to the telephoto end, and the second lens group and the third lens group are The distance between the third lens group and the fourth lens group is changed, and the second lens group is moved in the image plane direction to perform focusing from a long-distance object to a short-distance object. Is.
【００１３】上記構成のもとで、以下の条件のうち少な
くとも一つを満足するのが好ましい。 （１） ｜β２ｔ｜＞２ （２） ｜β２ｗ｜＞２ （３） β２ｔ＞２ （４） β２ｗ＜−２ （５） ０．５ ＜ ｆ２／ｆ３ ＜ ２ （６） ｆ２／（｜ｆ１｜＋ｅ１ｔ） ＞ ０．８ （ｆ１＜０） （７） ｆ２／（｜ｆ１｜＋ｅ１ｗ） ＜ １．２ 但し、β２ｔ：望遠端における第２レンズ群の結像倍
率、 β２ｗ：広角端における第２レンズ群の結像倍率、 ｆ１：第１レンズ群の焦点距離、 ｆ２：第２レンズ群の焦点距離、 ｆ３：第３レンズ群の焦点距離、 ｅ１ｗ：広角端における第１レンズ群の像側主点から第
２レンズ群の物側主点までの距離、 ｅ１ｔ：望遠端における第１レンズ群の像側主点から第
２レンズ群の物側主点までの距離である また、負の第１レンズ群と、正の第２レンズ群と、正の
第３レンズ群からなるズームレンズの場合には、以下の
条件を満足するのが望ましい。 （８） ｆ３／ｅ３ｗ ＞ ０．８ （９） ｆ３／ｅ３ｔ ＜ １．２ 但し、ｅ３ｗ：広角端における第３レンズ群の像側主点
から像面までの距離、 ｅ３ｔ：望遠端における第３レンズ群の像側主点から像
面までの距離である。Under the above structure, it is preferable that at least one of the following conditions is satisfied. (1) | β2t |> 2 (2) | β2w |> 2 (3) β2t> 2 (4) β2w <-2 (5) 0.5 <f2 / f3 <2 (6) f2 / (| f1 | + E1t)> 0.8 (f1 <0) (7) f2 / (| f1 | + e1w) <1.2 where β2t is the imaging magnification of the second lens group at the telephoto end, and β2w is the second lens at the wide-angle end. Imaging magnification of the group, f1: focal length of the first lens group, f2: focal length of the second lens group, f3: focal length of the third lens group, e1w: image-side principal point of the first lens group at the wide-angle end To the object-side principal point of the second lens group, e1t: distance from the image-side principal point of the first lens group to the object-side principal point of the second lens group at the telephoto end, and the negative first lens In the case of a zoom lens including a group, a positive second lens group, and a positive third lens group, It is desirable to satisfy the matter. (8) f3 / e3w> 0.8 (9) f3 / e3t <1.2 where e3w: distance from the image-side principal point of the third lens group to the image plane at the wide-angle end, e3t: third at the telephoto end It is the distance from the image-side principal point of the lens group to the image plane.
【００１４】[0014]
【作用】本発明のズームレンズにおいては、物体側から
順に、負の第１レンズ群と正の第２レンズ群と正の第３
レンズ群を有する構成とし、第２レンズ群での結像倍率
が広角端から望遠端までのズーム全域で大きな拡大倍率
となるように構成する。このような構成のもとで、第２
レンズ群を像面方向に移動させてフォーカシングを行う
と、第２レンズ群のフォーカシング移動量Δは以下の近
似式で与えられる。In the zoom lens of the present invention, in order from the object side, the negative first lens group, the positive second lens group, and the positive third lens group.
The lens group is included, and the image formation magnification in the second lens group is set to be a large enlargement magnification in the entire zoom range from the wide-angle end to the telephoto end. With such a configuration, the second
When focusing is performed by moving the lens unit in the image plane direction, the focusing movement amount Δ of the second lens unit is given by the following approximate expression.
【００１５】 Δ≒｛β2／（β2−１）｝・｛ｆ１2／（Ｄ０−ｆ１）｝ （１０） 但し、β：第２レンズ群の結像倍率、 ｆ１：第１レンズ群の焦点距離、 Ｄ０：物点から第１レンズ群の物側主点までの距離であ
る。 式（１０）の右辺のｆ１は定数であり、Ｄ０はズーミン
グによって全長の変化しないズームレンズでは定数とな
る。一方、βはズーミングによって変化するが、βの絶
対値が大きくなるよう構成すると、｛β2／（β2−
１）｝は１に近い値となりズーミング時の変化は小さく
なる。また、第２レンズ群の結像倍率βが−１となる場
合には、フォーカシングが不可能となる。Δ≈ {β 2 / (β 2 −1)} · {f1 2 / (D0-f1)} (10) where β is the image formation magnification of the second lens group, and f1: is the image formation ratio of the first lens group. Focal length, D0: Distance from the object point to the object-side principal point of the first lens group. F1 on the right side of Expression (10) is a constant, and D0 is a constant for a zoom lens whose total length does not change due to zooming. On the other hand, β changes due to zooming, but if it is configured so that the absolute value of β becomes large, {β 2 / (β 2 −
1)} becomes a value close to 1 and the change during zooming becomes small. Further, when the imaging magnification β of the second lens group becomes -1, focusing becomes impossible.
【００１６】このことから、第２レンズ群のフォーカシ
ング移動量のズーミングによる変化を小さくするには、
｜β｜を大きくすることが必要である。また、Ｄ０がズ
ーミング時に変化しないこと、すなわち、第１レンズ群
がズーミング時に移動しないことが望ましい。条件
（１）および条件（２）は、広角端と望遠端における｜
β｜の値を規定している。条件（１）および条件（２）
の下限を越えると、第２レンズ群のフォーカシング移動
量のズーミングによる変化が大きくなり好ましくない。
なお、条件（１）および条件（２）の下限値を３とする
と、第２レンズ群のフォーカシング移動量のズーミング
による変化をより小さくすることが可能となる。From this, in order to reduce the change in the focusing movement amount of the second lens unit due to zooming,
It is necessary to increase | β |. It is also desirable that D0 does not change during zooming, that is, the first lens group does not move during zooming. Condition (1) and condition (2) are | at the wide-angle end and the telephoto end.
It defines the value of β |. Condition (1) and condition (2)
When the value exceeds the lower limit, the change in focusing movement amount of the second lens unit due to zooming becomes large, which is not preferable.
If the lower limit values of the conditions (1) and (2) are set to 3, it is possible to further reduce the change in the focusing movement amount of the second lens group due to zooming.
【００１７】また、広角端と望遠端とで｜β｜の値をほ
ぼ等しくすると、広角端と望遠端での第２レンズ群のフ
ォーカシング移動量をほぼ等しくすることができる。こ
の場合、広角端での第２レンズ群の結像倍率β２ｗを負
の値、望遠端での第２レンズ群の結像倍率β２ｔを正の
値とするのが、ズーミングを効率よく行うために望まし
く、条件（３）および条件（４）を満足することが望ま
しい。Further, if the values of | β | are substantially equal at the wide-angle end and the telephoto end, the focusing movement amount of the second lens group at the wide-angle end and the telephoto end can be made substantially equal. In this case, the imaging magnification β2w of the second lens group at the wide-angle end is set to a negative value, and the imaging magnification β2t of the second lens group at the telephoto end is set to a positive value in order to efficiently perform zooming. It is desirable that the conditions (3) and (4) are satisfied.
【００１８】また、第２レンズ群または第３レンズ群を
コンペンセーターとすることにより、第１レンズ群を固
定することが可能である。条件（５）は、その際の第２
レンズ群と第３レンズ群の焦点距離の適切な比を規定す
る。条件（５）の下限を越えると第２レンズ群の屈折力
が大きくなり、球面収差の補正が困難となる。反対に条
件（５）の上限を越えると、バックフォーカスの確保
と、ズームレンズ全長の小型化が困難となる。The first lens group can be fixed by using the second lens group or the third lens group as a compensator. Condition (5) is the second
It defines an appropriate ratio of the focal lengths of the lens group and the third lens group. When the value goes below the lower limit of the condition (5), the refractive power of the second lens unit becomes large, and it becomes difficult to correct spherical aberration. On the other hand, when the value exceeds the upper limit of the condition (5), it becomes difficult to secure the back focus and reduce the overall length of the zoom lens.
【００１９】また、第２レンズ群または第３レンズ群を
コンペンセーターとして、広角端から望遠端へのズーミ
ングの際に第２レンズ群と第３レンズ群の間隔を変化さ
せる場合には、広角端近傍では第２レンズ群と第３レン
ズ群の間隔を拡大とし、望遠端近傍では縮小とすると、
レンズ全長を小型化するのに有効である。条件（６）と
条件（７）は、第２レンズ群でフォーカシングする場合
の第１レンズ群と第２レンズ群の焦点距離の適切な関係
を規定する。条件（６）の下限・条件（７）の上限のい
づれを外れても、第２レンズ群のフォーカシング移動量
のズーミングによる変化が大きくなり好ましくない。When the second lens group or the third lens group is used as a compensator and the distance between the second lens group and the third lens group is changed during zooming from the wide-angle end to the telephoto end, the wide-angle end is used. If the distance between the second lens group and the third lens group is increased in the vicinity and reduced in the vicinity of the telephoto end,
This is effective in reducing the overall length of the lens. The conditions (6) and (7) define an appropriate relationship between the focal lengths of the first lens group and the second lens group when focusing with the second lens group. If either the lower limit of the condition (6) or the upper limit of the condition (7) is deviated, a change in the focusing movement amount of the second lens unit due to zooming becomes large, which is not preferable.
【００２０】条件（８）と条件（９）は、負の第１レン
ズ群と正の第２レンズ群と正の第３レンズ群からなるズ
ームレンズにおいて、第２レンズ群でフォーカシングす
る場合の第３レンズ群の焦点距離の適切な範囲を規定す
る。条件（８）の下限・条件（９）の上限のいづれを外
れても、第２レンズ群のフォーカシング移動量のズーミ
ングによる変化が大きくなり好ましくない。The conditions (8) and (9) are the conditions for focusing with the second lens group in the zoom lens including the negative first lens group, the positive second lens group, and the positive third lens group. The appropriate range of the focal length of the three lens groups is defined. If either the lower limit of the condition (8) or the upper limit of the condition (9) is deviated, a change in the focusing movement amount of the second lens unit due to zooming becomes large, which is not preferable.
【００２１】また、本発明は、負の第１レンズ群と正の
第２レンズ群と正の第３レンズ群からなる３群ズームレ
ンズを基本としているが、この３群ズームレンズの像側
に正または負の第４レンズ群を付加して、大口径比化ま
たは小型化をはかってもよく、負の第４レンズ群と正の
第５レンズ群を付加して、高ズーム比化あるいは大口径
比化をはかってもよい。その際、広角端から望遠端への
ズーミング時に、第３レンズ群と第４レンズ群の間隔を
拡大し、第４レンズ群と第５レンズ群の間隔を縮小する
のが望ましい。The present invention is based on a three-group zoom lens composed of a negative first lens group, a positive second lens group, and a positive third lens group. A positive or negative fourth lens group may be added to achieve a large aperture ratio or downsizing, and a negative fourth lens group and a positive fifth lens group may be added to increase the zoom ratio or increase the zoom ratio. A ratio of apertures may be measured. At this time, it is desirable to increase the distance between the third lens group and the fourth lens group and reduce the distance between the fourth lens group and the fifth lens group during zooming from the wide-angle end to the telephoto end.
【００２２】[0022]
【実施例】以下に，本発明による各実施例について説明
する。 〔実施例１〕図１は、実施例１のレンズ構成図であり、
上部に広角端、下部に望遠端でのレンズ構成を示してい
る。物体側から順に、負の第１レンズ群Ｇ１と、正の第
２レンズ群Ｇ２と、正の第３レンズ群Ｇ３とから構成
し、広角端から望遠端への変倍に際して、第１レンズ群
は静止し、第２レンズ群と第３レンズ群はいずれも物体
方向に移動し、第１レンズ群と第２レンズ群との空気間
隔は減少し、第２レンズ群と第３レンズ群との空気間隔
は広角端近傍では拡大し、望遠端近傍では縮小する。EXAMPLES Each example according to the present invention will be described below. Example 1 FIG. 1 is a lens configuration diagram of Example 1,
The lens configuration at the wide-angle end is shown at the top and at the telephoto end at the bottom. The first lens group G1 includes a negative first lens group G1, a positive second lens group G2, and a positive third lens group G3 in order from the object side, and the first lens group G1 is used during zooming from the wide-angle end to the telephoto end. Is stationary, both the second lens group and the third lens group move in the object direction, the air gap between the first lens group and the second lens group decreases, and the second lens group and the third lens group The air spacing increases near the wide-angle end and decreases near the telephoto end.
【００２３】第１レンズ群の物体側から４番目のレンズ
面は非球面であり、非球面形状は次の式で与えられる。 Ｘ（ｙ）＝ｙ2／［ｒ・｛１＋（１−ｋ・ｙ2／ｒ2）1/2｝］ ＋C2・ｙ2＋C4・ｙ4＋C6・ｙ6＋C8・ｙ8＋C10・ｙ10 但し、Ｘ（ｙ）は非球面の頂点における接平面から高さ
ｙにおける非球面上の位置までの光軸方向に沿った距
離、ｒは近軸の曲率半径、ｋは円錐定数、Ciは第ｉ次の
非球面係数である。The fourth lens surface of the first lens group from the object side is an aspherical surface, and the aspherical shape is given by the following equation. X (y) = y 2 / [r · {1+ (1-k · y 2 / r 2) 1/2}] + C2 · y 2 + C4 · y 4 + C6 · y 6 + C8 · y 8 + C10 · y 10 where , X (y) is the distance along the optical axis from the tangent plane at the apex of the aspherical surface to the position on the aspherical surface at the height y, r is the paraxial radius of curvature, k is the conic constant, and Ci is the i-th The following aspherical coefficients.
【００２４】また、遠距離物体から近距離物体へのフォ
ーカシングは、第２レンズ群を像面側に移動させて行な
う。以下の表１に、本発明における実施例１の諸元の値
を掲げる。実施例の諸元表中のｆは焦点距離、ＦはＦナ
ンバー、 2ωは画角を表す。そして、左端の数字は物体
側からの順序を表し、ｒはレンズ面の曲率半径、ｄはレ
ンズ面間隔、ｎ及びνは屈折率及びアッベ数のｄ線（λ
=587.6nm）に対する値である。また、可変間隔表中のＲ
は撮影距離である。Focusing from a long-distance object to a short-distance object is performed by moving the second lens group to the image plane side. Table 1 below lists values of specifications of the first embodiment of the present invention. In the specification table of the embodiment, f is the focal length, F is the F number, and 2ω is the angle of view. The number at the left end represents the order from the object side, r is the radius of curvature of the lens surface, d is the distance between the lens surfaces, n and ν are the refractive index and the Abbe number d line (λ
= 587.6 nm). Also, R in the variable interval table
Is the shooting distance.
【００２５】[0025]
【表１】 図２、図３は、それぞれ実施例１の撮影距離Ｒ＝ｉｎｆ
における広角端での諸収差図、望遠端での諸収差図を示
し、図４、図５は、それぞれ実施例１の撮影距離Ｒ＝５
００における広角端での諸収差図、望遠端での諸収差図
を示す。各収差図において、ＦNOはＦナンバー、ＮＡは
開口数、Ｙは像高、ｄはｄ線（λ=587.6nm）及びｇはｇ
線（λ=435.6nm）を示している。非点収差図において、
実線はサジタル像面を、破線はメリジオナル像面をそれ
ぞれ示す。[Table 1] 2 and 3, the shooting distance R of the first embodiment is R = inf.
FIGS. 4A and 4B are graphs showing various aberrations at the wide-angle end and at the telephoto end in FIGS. 4 and 5, respectively.
00 shows various aberration diagrams at the wide-angle end and at 00 at the telephoto end. In each aberration diagram, FNO is the F number, NA is the numerical aperture, Y is the image height, d is the d line (λ = 587.6 nm), and g is g.
The line (λ = 435.6 nm) is shown. In the astigmatism diagram,
The solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane.
【００２６】各収差図から、本実施例は諸収差が良好に
補正され、優れた結像性能を有していることが明らかで
ある。 〔実施例２〕図６は、実施例２のレンズ構成図であり、
上部に広角端、下部に望遠端でのレンズ構成を示してい
る。物体側から順に、負の第１レンズ群Ｇ１と、正の第
２レンズ群Ｇ２と、正の第３レンズ群Ｇ３と、負の第４
レンズ群Ｇ４と正の第５レンズ群Ｇ５から構成し、広角
端から望遠端への変倍に際して、第１レンズ群は静止
し、第２乃至第５レンズ群はいずれも物体方向に移動
し、第１レンズ群と第２レンズ群との空気間隔は減少
し、第２レンズ群と第３レンズ群との空気間隔は増大
し、第３レンズ群と第４レンズ群との空気間隔は増大
し、第４レンズ群と第５レンズ群との空気間隔は減少す
る。From each aberration diagram, it is apparent that various aberrations are satisfactorily corrected and that this example has excellent imaging performance. Example 2 FIG. 6 is a lens configuration diagram of Example 2,
The lens configuration at the wide-angle end is shown at the top and at the telephoto end at the bottom. In order from the object side, the negative first lens group G1, the positive second lens group G2, the positive third lens group G3, and the negative fourth lens group G2.
It is composed of a lens group G4 and a positive fifth lens group G5, and during zooming from the wide-angle end to the telephoto end, the first lens group is stationary, and the second to fifth lens groups are all moved in the object direction, The air gap between the first lens group and the second lens group decreases, the air gap between the second lens group and the third lens group increases, and the air gap between the third lens group and the fourth lens group increases. , The air gap between the fourth lens group and the fifth lens group decreases.
【００２７】また、遠距離物体から近距離物体へのフォ
ーカシングは、第２レンズ群を像面側に移動させて行な
う。第１レンズ群の最も物体側のレンズ面は非球面であ
り、非球面形状は次の式で与えられる。 Ｘ（ｙ）＝ｙ2／［ｒ・｛１＋（１−ｋ・ｙ2／ｒ2）1/2｝］ ＋C2・ｙ2＋C4・ｙ4＋C6・ｙ6＋C8・ｙ8＋C10・ｙ10 但し、Ｘ（ｙ）は非球面の頂点における接平面から高さ
ｙにおける非球面上の位置までの光軸方向に沿った距
離、ｒは近軸の曲率半径、ｋは円錐定数、Ciは第ｉ次の
非球面係数である。Focusing from a long-distance object to a short-distance object is performed by moving the second lens group to the image plane side. The most object-side lens surface of the first lens group is an aspherical surface, and the aspherical shape is given by the following equation. X (y) = y 2 / [r · {1+ (1-k · y 2 / r 2) 1/2}] + C2 · y 2 + C4 · y 4 + C6 · y 6 + C8 · y 8 + C10 · y 10 where , X (y) is the distance along the optical axis from the tangent plane at the apex of the aspherical surface to the position on the aspherical surface at the height y, r is the paraxial radius of curvature, k is the conic constant, and Ci is the i-th The following aspherical coefficients.
【００２８】以下の表２に、本発明における実施例２の
諸元の値を掲げる。実施例の諸元表中のｆは焦点距離、
ＦはＦナンバー、 2ωは画角を表す。そして、左端の数
字は物体側からの順序を表し、ｒはレンズ面の曲率半
径、ｄはレンズ面間隔、ｎ及びνは屈折率及びアッベ数
のｄ線（λ=587.6nm）に対する値である。また、可変間
隔表中のＲは撮影距離である。Table 2 below lists values of specifications of the second embodiment of the present invention. F in the specification table of the embodiment is the focal length,
F is the F number and 2ω is the angle of view. The leftmost number represents the order from the object side, r is the radius of curvature of the lens surface, d is the distance between the lens surfaces, and n and ν are the values of the refractive index and Abbe number for the d line (λ = 587.6 nm). . Further, R in the variable interval table is a shooting distance.
【００２９】[0029]
【表２】 ｆ＝２０．５０〜２４．００〜２８．００〜３４．００ Ｆ／２．８８ ２ω＝９５．３６〜８４．２０〜７４．７９〜６４．４１゜ r d ν n 1 42.8646 2.5000 49.5 1.77279 2 19.0563 12.2538 3 -89.7386 2.0000 47.5 1.78797 4 43.6226 3.0774 5 -1278.6770 2.7808 31.6 1.75692 6 -114.4184 0.2000 7 37.2342 3.5000 31.6 1.75692 8 70.6430 (d 8) 9 58.7658 1.2000 29.5 1.71736 10 27.8095 7.7426 70.0 1.51860 11 -62.9952 (d11) 12 40.9312 2.9396 53.9 1.71300 13 178.2683 (d13) 14 （絞り） 2.0000 15 -40.2685 1.2000 52.3 1.74810 16 28.7416 3.3073 25.4 1.80518 17 203.9851 (d17) 18 59.1968 3.8000 50.8 1.65844 19 -63.0449 1.5000 20 79.5746 2.0000 26.1 1.78470 21 30.6815 1.8153 22 121.6247 3.3377 45.4 1.79668 23 -76.5204 0.2000 24 275.3981 6.1577 57.0 1.62280 25 -21.9059 1.7000 23.0 1.86074 26 -60.5026 第１面非球面係数 ｋ = 1.0000 C2 = 0.0000 C4 = 3.9551E-6 C6 = 7.4971E-9 C8 =-1.2898E-11 C10= 2.0419E-14 可変間隔表 ｆ 20.50 24.00 28.00 34.00 Ｒ inf inf inf inf ｄ 8 19.53510 12.68258 7.15140 1.00000 ｄ 11 3.53475 7.61249 9.66310 9.97063 ｄ 13 1.54528 4.05890 7.08276 9.83202 ｄ 17 9.73143 7.26988 4.61998 2.00000 ｆ 20.50 24.00 28.00 34.00 Ｒ 500.00 500.00 500.00 500.00 d 8 22.07078 15.26240 9.79958 3.76429 d 11 0.99907 5.03267 7.01491 7.20634 d 13 1.54528 4.05890 7.08276 9.83202 d 17 9.73143 7.26988 4.61998 2.00000 条件対応値 β２ｔ＝ ３．４１０ β２ｗ＝１９．６０１ ｆ２／ｆ３＝１．０３６ ｆ２／（｜ｆ１｜＋ｅ１ｔ）＝１．４１４ ｆ２／（｜ｆ１｜＋ｅ１ｗ）＝１．０５４ 図７、図８は、それぞれ実施例２の撮影距離Ｒ＝ｉｎｆ
における広角端での諸収差図、望遠端での諸収差図を示
し、図９、図１０は、それぞれ実施例２の撮影距離Ｒ＝
５００における広角端での諸収差図、望遠端での諸収差
図を示す。各収差図において、ＦNOはＦナンバー、ＮＡ
は開口数、Ｙは像高、ｄはｄ線（λ=587.6nm）及びｇは
ｇ線（λ=435.6nm）を示している。非点収差図におい
て、実線はサジタル像面を、破線はメリジオナル像面を
それぞれ示す。[Table 2] f = 20.50 to 24.00 to 28.00 to 34.00 F / 2.88 2ω = 95.36 to 84.20 to 74.79 to 64.41 ° rd ν n 1 42.8646 2.5000 49.5 1.77279 2 19.0563 12.2538 3 -89.7386 2.0000 47.5 1.78797 4 43.6226 3.0774 5 -1278.6770 2.7808 31.6 1.75692 6 -114.4184 0.2000 7 37.2342 3.5000 31.6 1.75692 8 70.6430 (d 8) 9 58.7658 1.2000 29.5 1.71736 10 27.8095 7.7426 70.0 1.51860 11 -62.9952 ) 12 40.9312 2.9396 53.9 1.71300 13 178.2683 (d13) 14 (aperture) 2.0000 15 -40.2685 1.2000 52.3 1.74810 16 28.7416 3.3073 25.4 1.80518 17 203.9851 (d17) 18 59.1968 3.8000 50.8 1.65844 19 -63.0449 1.5000 20 79.5746 2.0000 26.1 1.78470 21 30.6815 1.8153 22 121.6247 3.3377 45.4 1.79668 23 -76.5204 0.2000 24 275.3981 6.1577 57.0 1.62280 25 -21.9059 1.7000 23.0 1.86074 26 -60.5026 First surface aspherical coefficient k = 1.0000 C2 = 0.0000 C4 = 3.9551E-6 C6 = 7.4971E-9 C8 = -1.2898 E-11 C10 = 2.0419 E-14 Variable spacing table f 20.50 24.00 28.00 3 4.00 R inf inf inf inf d 8 19.53510 12.68258 7.15140 1.00000 d 11 3.53475 7.61249 9.66310 9.97063 d 13 1.54528 4.05890 7.08276 9.83202 d 17 9.73143 7.26988 4.61998 2.00000 f 20.50 24.00 28.00 34.00 R 500.00 500.00 500.00 500.0029 811 9.78 7.01491 7.20634 d 13 1.54528 4.05890 7.08276 9.83202 d 17 9.73143 7.26988 4.61998 2.00000 Condition corresponding value β2t = 3.410 β2w = 19.601 f2 / f3 = 1.036 f2 / (| f1 | + e1t) = 1.414 f2 / (| f1 | + e1w) = 1.054 FIGS. 7 and 8 show the shooting distance R = inf of the second embodiment.
Various aberration diagrams at the wide angle end and various aberration diagrams at the telephoto end are shown in FIGS. 9 and 10, respectively, and FIG. 9 and FIG.
The various aberration diagrams at the wide-angle end and the various aberration diagrams at the telephoto end in 500 are shown. In each aberration diagram, FNO is F number, NA
Is the numerical aperture, Y is the image height, d is the d-line (λ = 587.6 nm) and g is the g-line (λ = 435.6 nm). In the astigmatism diagram, the solid line shows the sagittal image plane, and the broken line shows the meridional image plane.
【００３０】各収差図から、本実施例は諸収差が良好に
補正され、優れた結像性能を有していることが明らかで
ある。 〔実施例３〕図１１は、実施例３のレンズ構成図であ
り、上部に広角端、下部に望遠端でのレンズ構成を示し
ている。物体側から順に、負の第１レンズ群Ｇ１と、正
の第２レンズ群Ｇ２と、正の第３レンズ群Ｇ３と、負の
第４レンズ群Ｇ４と正の第５レンズ群Ｇ５から構成し、
広角端から望遠端への変倍に際して、第１レンズ群は静
止し、第２乃至第５レンズ群はいずれも物体方向に移動
し、第１レンズ群と第２レンズ群との空気間隔は減少
し、第２レンズ群と第３レンズ群との空気間隔は増大
し、第３レンズ群と第４レンズ群との空気間隔は増大
し、第４レンズ群と第５レンズ群との空気間隔は減少す
る。From each aberration diagram, it is clear that various aberrations are satisfactorily corrected and that this embodiment has excellent imaging performance. [Third Embodiment] FIG. 11 is a lens configuration diagram of a third embodiment, in which the upper part shows the lens structure at the wide-angle end and the lower part shows the lens structure at the telephoto end. In order from the object side, a negative first lens group G1, a positive second lens group G2, a positive third lens group G3, a negative fourth lens group G4, and a positive fifth lens group G5. ,
Upon zooming from the wide-angle end to the telephoto end, the first lens group is stationary, all the second to fifth lens groups move in the object direction, and the air gap between the first lens group and the second lens group decreases. However, the air distance between the second lens group and the third lens group increases, the air distance between the third lens group and the fourth lens group increases, and the air distance between the fourth lens group and the fifth lens group increases. Decrease.
【００３１】また、遠距離物体から近距離物体へのフォ
ーカシングは、第２レンズ群を像面側に移動させて行な
う。第１レンズ群の最も物体側のレンズ面は非球面であ
り、非球面形状は次の式で与えられる。 Ｘ（ｙ）＝ｙ2／［ｒ・｛１＋（１−ｋ・ｙ2／ｒ2）1/2｝］ ＋C2・ｙ2＋C4・ｙ4＋C6・ｙ6＋C8・ｙ8＋C10・ｙ10 但し、Ｘ（ｙ）は非球面の頂点における接平面から高さ
ｙにおける非球面上の位置までの光軸方向に沿った距
離、ｒは近軸の曲率半径、ｋは円錐定数、Ciは第ｉ次の
非球面係数である。Focusing from a long-distance object to a short-distance object is performed by moving the second lens group to the image plane side. The most object-side lens surface of the first lens group is an aspherical surface, and the aspherical shape is given by the following equation. X (y) = y 2 / [r · {1+ (1-k · y 2 / r 2) 1/2}] + C2 · y 2 + C4 · y 4 + C6 · y 6 + C8 · y 8 + C10 · y 10 where , X (y) is the distance along the optical axis from the tangent plane at the apex of the aspherical surface to the position on the aspherical surface at the height y, r is the paraxial radius of curvature, k is the conic constant, and Ci is the i-th The following aspherical coefficients.
【００３２】以下の表３に、本発明における実施例３の
諸元の値を掲げる。実施例の諸元表中のｆは焦点距離、
ＦはＦナンバー、 2ωは画角を表す。そして、左端の数
字は物体側からの順序を表し、ｒはレンズ面の曲率半
径、ｄはレンズ面間隔、ｎ及びνは屈折率及びアッベ数
のｄ線（λ=587.6nm）に対する値である。また、可変間
隔表中のＲは撮影距離である。Table 3 below lists values of specifications of the third embodiment of the present invention. F in the specification table of the embodiment is the focal length,
F is the F number and 2ω is the angle of view. The leftmost number represents the order from the object side, r is the radius of curvature of the lens surface, d is the distance between the lens surfaces, and n and ν are the values of the refractive index and Abbe number for the d line (λ = 587.6 nm). . Further, R in the variable interval table is a shooting distance.
【００３３】[0033]
【表３】 ｆ＝２０．５０〜２４．００〜２８．００〜３４．００ Ｆ／２．８８ ２ω＝９５．３２〜８４．１３〜７４．６８〜６４．３３゜ r d ν n 1 42.2348 2.5000 49.5 1.77279 2 18.6087 12.6784 3 -85.0463 2.0000 47.5 1.78797 4 42.8849 3.4377 5 -281.6993 2.8294 31.6 1.75692 6 -91.5606 0.2000 7 37.8425 3.5687 31.6 1.75692 8 79.7702 (d 8) 9 49.3392 1.2000 29.5 1.71736 10 25.1981 8.9627 70.0 1.51860 11 -57.2394 (d11) 12 38.8324 2.9313 53.9 1.71300 13 141.4542 (d13) 14 （絞り） 2.0000 15 -45.2367 1.2000 52.3 1.74810 16 25.3136 3.2146 25.4 1.80518 17 86.3355 (d17) 18 49.6845 3.7880 50.8 1.65844 19 -66.2974 1.5000 20 52.9095 2.0000 26.1 1.78470 21 26.8530 1.9865 22 134.4554 2.8736 45.4 1.79668 23 -107.7591 0.2000 24 540.8718 5.9855 57.0 1.62280 25 -19.9107 1.7000 23.0 1.86074 26 -49.3725 第１面非球面係数 ｋ = 1.0000 C2 = 0.0000 C4 = 3.9665E-6 C6 = 7.7825E-9 C8 =-1.3483E-11 C10= 2.1699E-14 可変間隔表 ｆ 20.50 24.00 28.00 34.00 Ｒ inf inf inf inf ｄ 8 19.81245 13.19465 7.54540 1.00000 ｄ 11 3.53277 8.03935 10.95058 12.18067 ｄ 13 1.30000 3.06781 5.05089 6.45949 ｄ 17 9.12737 6.88872 4.40569 2.00000 ｆ 20.50 24.00 28.00 34.00 Ｒ 500.00 500.00 500.00 500.00 d 8 22.34554 15.67965 10.03095 3.53360 d 11 0.99968 5.55435 8.46503 9.64707 d 13 1.30000 3.06781 5.05089 6.45949 d 17 9.12737 6.88872 4.40569 2.00000 条件対応値 β２ｔ＝ ６．８９５ β２ｗ＝−６．９６７ ｆ２／ｆ３＝０．８７９ ｆ２／（｜ｆ１｜＋ｅ１ｔ）＝１．１７０ ｆ２／（｜ｆ１｜＋ｅ１ｗ）＝０．８７４ 図１２、図１３は、それぞれ実施例３の撮影距離Ｒ＝ｉ
ｎｆにおける広角端での諸収差図、望遠端での諸収差図
を示し、図１４、図１５は、それぞれ実施例３の撮影距
離Ｒ＝５００における広角端での諸収差図、望遠端での
諸収差図を示す。各収差図において、ＦNOはＦナンバ
ー、ＮＡは開口数、Ｙは像高、ｄはｄ線（λ=587.6nm）
及びｇはｇ線（λ=435.6nm）を示している。非点収差図
において、実線はサジタル像面を、破線はメリジオナル
像面をそれぞれ示す。[Table 3] f = 20.50 to 24.00 to 28.00 to 34.00 F / 2.88 2ω = 95.32 to 84.13 to 74.68 to 64.33 ° rd ν n 1 42.2348 2.5000 49.5 1.77279 2 18.6087 12.6784 3 -85.0463 2.0000 47.5 1.78797 4 42.8849 3.4377 5 -281.6993 2.8294 31.6 1.75692 6 -91.5606 0.2000 7 37.8425 3.5687 31.6 1.75692 8 79.7702 (d 8) 9 49.3392 1.2000 29.5 1.71736 10 25.1981 8.911 77.2 1.51860 117.2 ) 12 38.8324 2.9313 53.9 1.71300 13 141.4542 (d13) 14 (Aperture) 2.0000 15 -45.2367 1.2000 52.3 1.74810 16 25.3136 3.2146 25.4 1.80518 17 86.3355 (d17) 18 49.6845 3.7880 50.8 1.65844 19 -66.2974 1.5000 20 52.9095 2.0000 26.1 1.78470 21 26.8530 1.9865 134.4554 2.8736 45.4 1.79668 23 -107.7591 0.2000 24 540.8718 5.9855 57.0 1.62280 25 -19.9107 1.7000 23.0 1.86074 26 -49.3725 First surface aspherical coefficient k = 1.0000 C2 = 0.0000 C4 = 3.9665E-6 C6 = 7.7825E-9 C8 = -1.3483 E-11 C10 = 2.1699 E-14 Variable interval table f 20.50 24.00 28.00 34. 00 R inf inf inf inf d 8 19.81245 13.19465 7.54540 1.00000 d 11 3.53277 8.03935 10.95058 12.18067 d 13 1.30000 3.06781 5.05089 6.45949 d 17 9.12737 6.88872 4.40569 2.00000 f 20.50 24.00 28.00 34.00 R. 50.00 500.00 500.00 500.0035 8.46503 9.64707 d 13 1.30000 3.06781 5.05089 6.45949 d 17 9.12737 6.88872 4.40569 2.00000 Condition corresponding value β2t = 6.895 β2w = −6.967 f2 / f3 = 0.879 f2 / (| f1 | + e1t) = 1.170 f2 / ( | F1 | + e1w) = 0.874 FIG. 12 and FIG. 13 show the shooting distance R = i of the third embodiment, respectively.
FIGS. 14 and 15 show various aberration diagrams at the wide-angle end and the telephoto end at nf, and FIGS. 14 and 15 show various aberration diagrams at the wide-angle end and the telephoto end at the shooting distance R = 500 of Example 3, respectively. The various aberration figures are shown. In each aberration diagram, FNO is the F number, NA is the numerical aperture, Y is the image height, and d is the d line (λ = 587.6 nm).
And g are g lines (λ = 435.6 nm). In the astigmatism diagram, the solid line shows the sagittal image plane, and the broken line shows the meridional image plane.
【００３４】各収差図から、本実施例は諸収差が良好に
補正され、優れた結像性能を有していることが明らかで
ある。 〔実施例４〕図１６は、実施例４のレンズ構成図であ
り、上部に広角端、下部に望遠端でのレンズ構成を示し
ている。物体側から順に、負の第１レンズ群Ｇ１と、正
の第２レンズ群Ｇ２と、正の第３レンズ群Ｇ３とから構
成し、広角端から望遠端への変倍に際して、第１レンズ
群は静止し、第２レンズ群と第３レンズ群はいずれも物
体方向に移動し、第１レンズ群と第２レンズ群との空気
間隔は減少し、第２レンズ群と第３レンズ群との空気間
隔は広角端近傍では拡大し、望遠端近傍では縮小する。From each aberration diagram, it is apparent that various aberrations are satisfactorily corrected and that this example has excellent imaging performance. [Embodiment 4] FIG. 16 is a lens configuration diagram of Embodiment 4, in which the lens configuration at the wide-angle end is shown at the upper portion and at the telephoto end at the lower portion. The first lens group G1 includes a negative first lens group G1, a positive second lens group G2, and a positive third lens group G3 in order from the object side, and the first lens group G1 is used during zooming from the wide-angle end to the telephoto end. Is stationary, both the second lens group and the third lens group move in the object direction, the air gap between the first lens group and the second lens group decreases, and the second lens group and the third lens group The air spacing increases near the wide-angle end and decreases near the telephoto end.
【００３５】第１レンズ群の物体側から４番目のレンズ
面は非球面であり、非球面形状は次の式で与えられる。
また、遠距離物体から近距離物体へのフォーカシング
は、第２レンズ群を像面側に移動させて行なう。以下の
表４に、本発明における実施例４の諸元の値を掲げる。
実施例の諸元表中のｆは焦点距離、ＦはＦナンバー、 2
ωは画角を表す。そして、左端の数字は物体側からの順
序を表し、ｒはレンズ面の曲率半径、ｄはレンズ面間
隔、ｎ及びνは屈折率及びアッベ数のｄ線（λ=587.6n
m）に対する値である。また、可変間隔表中のＲは撮影
距離である。The fourth lens surface of the first lens group from the object side is an aspherical surface, and the aspherical shape is given by the following equation.
Focusing from a long-distance object to a short-distance object is performed by moving the second lens group to the image plane side. Table 4 below lists values of specifications of the fourth embodiment of the present invention.
In the specification table of the embodiment, f is the focal length, F is the F number, and 2
ω represents the angle of view. The leftmost number represents the order from the object side, r is the radius of curvature of the lens surface, d is the lens surface spacing, and n and ν are the refractive index and the Abbe number d line (λ = 587.6n
This is the value for m). Further, R in the variable interval table is a shooting distance.
【００３６】[0036]
【表４】 図１７、図１８は、それぞれ実施例４の撮影距離Ｒ＝ｉ
ｎｆにおける広角端での諸収差図、望遠端での諸収差図
を示し、図１９、図２０は、それぞれ実施例４の撮影距
離Ｒ＝５００における広角端での諸収差図、望遠端での
諸収差図を示す。各収差図において、ＦNOはＦナンバ
ー、ＮＡは開口数、Ｙは像高、ｄはｄ線（λ=587.6nm）
及びｇはｇ線（λ=435.6nm）を示している。非点収差図
において、実線はサジタル像面を、破線はメリジオナル
像面をそれぞれ示す。[Table 4] 17 and 18 show the shooting distance R = i of the fourth embodiment, respectively.
Various aberration diagrams at the wide-angle end at nf and various aberration diagrams at the telephoto end are shown, and FIGS. 19 and 20 show various aberration diagrams at the wide-angle end and the telephoto end at the shooting distance R = 500 of Example 4, respectively. The various aberration figures are shown. In each aberration diagram, FNO is the F number, NA is the numerical aperture, Y is the image height, and d is the d line (λ = 587.6 nm).
And g are g lines (λ = 435.6 nm). In the astigmatism diagram, the solid line shows the sagittal image plane, and the broken line shows the meridional image plane.
【００３７】各収差図から、本実施例は諸収差が良好に
補正され、優れた結像性能を有していることが明らかで
ある。 〔実施例５〕図２１は、実施例５のレンズ構成図であ
り、上部に広角端、下部に望遠端でのレンズ構成を示し
ている。物体側から順に、負の第１レンズ群Ｇ１と、正
の第２レンズ群Ｇ２と、正の第３レンズ群Ｇ３と、負の
第４レンズ群Ｇ４から構成し、広角端から望遠端への変
倍に際して、第１レンズ群と第４レンズ群は静止し、第
２レンズ群と第３レンズ群はいずれも物体方向に移動
し、第１レンズ群と第２レンズ群との空気間隔は減少
し、第２レンズ群と第３レンズ群との空気間隔は広角端
近傍では拡大し、望遠端近傍では縮小し、第３レンズ群
と第４レンズ群の空気間隔は拡大する。From each aberration diagram, it is apparent that various aberrations are satisfactorily corrected and that this embodiment has excellent imaging performance. [Embodiment 5] FIG. 21 is a lens configuration diagram of Embodiment 5, showing the lens configuration at the wide-angle end at the upper portion and at the telephoto end at the lower portion. It is composed of a negative first lens group G1, a positive second lens group G2, a positive third lens group G3, and a negative fourth lens group G4 in order from the object side, and from the wide-angle end to the telephoto end. Upon zooming, the first lens group and the fourth lens group are stationary, the second lens group and the third lens group both move toward the object, and the air gap between the first lens group and the second lens group decreases. The air distance between the second lens group and the third lens group increases near the wide-angle end, decreases near the telephoto end, and the air distance between the third lens group and the fourth lens group increases.
【００３８】第１レンズ群の物体側から２番目のレンズ
面は非球面であり、非球面形状は次の式で与えられる。 Ｘ（ｙ）＝ｙ2／［ｒ・｛１＋（１−ｋ・ｙ2／ｒ2）1/2｝］ ＋C2・ｙ2＋C4・ｙ4＋C6・ｙ6＋C8・ｙ8＋C10・ｙ10 但し、Ｘ（ｙ）は非球面の頂点における接平面から高さ
ｙにおける非球面上の位置までの光軸方向に沿った距
離、ｒは近軸の曲率半径、ｋは円錐定数、Ciは第ｉ次の
非球面係数である。The second lens surface from the object side of the first lens group is an aspherical surface, and the aspherical shape is given by the following equation. X (y) = y 2 / [r · {1+ (1-k · y 2 / r 2) 1/2}] + C2 · y 2 + C4 · y 4 + C6 · y 6 + C8 · y 8 + C10 · y 10 where , X (y) is the distance along the optical axis from the tangent plane at the apex of the aspherical surface to the position on the aspherical surface at the height y, r is the paraxial radius of curvature, k is the conic constant, and Ci is the i-th The following aspherical coefficients.
【００３９】また、遠距離物体から近距離物体へのフォ
ーカシングは、第２レンズ群を像面側に移動させて行な
う。以下の表５に、本発明における実施例５の諸元の値
を掲げる。実施例の諸元表中のｆは焦点距離、ＦはＦナ
ンバー、 2ωは画角を表す。そして、左端の数字は物体
側からの順序を表し、ｒはレンズ面の曲率半径、ｄはレ
ンズ面間隔、ｎ及びνは屈折率及びアッベ数のｄ線（λ
=587.6nm）に対する値である。また、可変間隔表中のＲ
は撮影距離である。Focusing from a long-distance object to a short-distance object is performed by moving the second lens unit to the image plane side. Table 5 below lists values of specifications of the fifth embodiment of the present invention. In the specification table of the embodiment, f is the focal length, F is the F number, and 2ω is the angle of view. The number at the left end represents the order from the object side, r is the radius of curvature of the lens surface, d is the distance between the lens surfaces, n and ν are the refractive index and the Abbe number d line (λ
= 587.6 nm). Also, R in the variable interval table
Is the shooting distance.
【００４０】[0040]
【表５】 図２２、図２３は、それぞれ実施例５の撮影距離Ｒ＝ｉ
ｎｆにおける広角端での諸収差図、望遠端での諸収差図
を示し、図２４、図２５は、それぞれ実施例５の撮影距
離Ｒ＝５００における広角端での諸収差図、望遠端での
諸収差図を示す。各収差図において、ＦNOはＦナンバ
ー、ＮＡは開口数、Ｙは像高、ｄはｄ線（λ=587.6nm）
及びｇはｇ線（λ=435.6nm）を示している。非点収差図
において、実線はサジタル像面を、破線はメリジオナル
像面をそれぞれ示す。[Table 5] 22 and 23 show the shooting distance R = i of the fifth embodiment, respectively.
Various aberration diagrams at the wide-angle end at nf and various aberration diagrams at the telephoto end are shown. FIGS. 24 and 25 show various aberration diagrams at the wide-angle end and the telephoto end at the shooting distance R = 500 of Example 5, respectively. The various aberration figures are shown. In each aberration diagram, FNO is the F number, NA is the numerical aperture, Y is the image height, and d is the d line (λ = 587.6 nm).
And g are g lines (λ = 435.6 nm). In the astigmatism diagram, the solid line shows the sagittal image plane, and the broken line shows the meridional image plane.
【００４１】各収差図から、本実施例は諸収差が良好に
補正され、優れた結像性能を有していることが明らかで
ある。 〔実施例６〕図２６は、実施例６のレンズ構成図であ
り、上部に広角端、下部に望遠端でのレンズ構成を示し
ている。物体側から順に、負の第１レンズ群Ｇ１と、正
の第２レンズ群Ｇ２と、正の第３レンズ群Ｇ３と、負の
第４レンズ群Ｇ４から構成し、広角端から望遠端への変
倍に際して、第１レンズ群と第４レンズ群は静止し、第
２レンズ群と第３レンズ群はいずれも物体方向に移動
し、第１レンズ群と第２レンズ群との空気間隔は減少
し、第２レンズ群と第３レンズ群との空気間隔は広角端
近傍では拡大し、望遠端近傍では縮小し、第３レンズ群
と第４レンズ群の空気間隔は拡大する。From each aberration diagram, it is apparent that various aberrations are satisfactorily corrected and that this example has excellent imaging performance. [Sixth Embodiment] FIG. 26 is a lens configuration diagram of a sixth embodiment, in which the lens configuration at the wide-angle end is shown at the upper portion and at the telephoto end at the lower portion. It is composed of a negative first lens group G1, a positive second lens group G2, a positive third lens group G3, and a negative fourth lens group G4 in order from the object side, and from the wide-angle end to the telephoto end. Upon zooming, the first lens group and the fourth lens group are stationary, the second lens group and the third lens group both move toward the object, and the air gap between the first lens group and the second lens group decreases. The air distance between the second lens group and the third lens group increases near the wide-angle end, decreases near the telephoto end, and the air distance between the third lens group and the fourth lens group increases.
【００４２】また、遠距離物体から近距離物体へのフォ
ーカシングは、第２レンズ群を像面側に移動させて行な
う。以下の表６に、本発明における実施例６の諸元の値
を掲げる。実施例の諸元表中のｆは焦点距離、ＦはＦナ
ンバー、 2ωは画角を表す。そして、左端の数字は物体
側からの順序を表し、ｒはレンズ面の曲率半径、ｄはレ
ンズ面間隔、ｎ及びνは屈折率及びアッベ数のｄ線（λ
=587.6nm）に対する値である。また、可変間隔表中のＲ
は撮影距離である。Focusing from a long-distance object to a short-distance object is performed by moving the second lens group to the image plane side. Table 6 below lists values of specifications of the sixth embodiment of the present invention. In the specification table of the embodiment, f is the focal length, F is the F number, and 2ω is the angle of view. The number at the left end represents the order from the object side, r is the radius of curvature of the lens surface, d is the distance between the lens surfaces, n and ν are the refractive index and the Abbe number d line (λ
= 587.6 nm). Also, R in the variable interval table
Is the shooting distance.
【００４３】[0043]
【表６】 図２７、図２８は、それぞれ実施例６の撮影距離Ｒ＝ｉ
ｎｆにおける広角端での諸収差図、望遠端での諸収差図
を示し、図２９、図３０は、それぞれ実施例６の撮影距
離Ｒ＝５００における広角端での諸収差図、望遠端での
諸収差図を示す。各収差図において、ＦNOはＦナンバ
ー、ＮＡは開口数、Ｙは像高、ｄはｄ線（λ=587.6nm）
及びｇはｇ線（λ=435.6nm）を示している。非点収差図
において、実線はサジタル像面を、破線はメリジオナル
像面をそれぞれ示す。[Table 6] 27 and 28 show the shooting distance R = i of the sixth embodiment, respectively.
FIGS. 29 and 30 show various aberration diagrams at the wide-angle end and the telephoto end at nf, and FIGS. 29 and 30 show various aberration diagrams at the wide-angle end and the telephoto end at the shooting distance R = 500 of Example 6, respectively. The various aberration figures are shown. In each aberration diagram, FNO is the F number, NA is the numerical aperture, Y is the image height, and d is the d line (λ = 587.6 nm).
And g are g lines (λ = 435.6 nm). In the astigmatism diagram, the solid line shows the sagittal image plane, and the broken line shows the meridional image plane.
【００４４】各収差図から、本実施例は諸収差が良好に
補正され、優れた結像性能を有していることが明らかで
ある。 〔実施例７〕図３１は、実施例７のレンズ構成図であ
り、上部に広角端、下部に望遠端でのレンズ構成を示し
ている。物体側から順に、負の第１レンズ群Ｇ１と、正
の第２レンズ群Ｇ２と、正の第３レンズ群Ｇ３と、正の
第４レンズ群Ｇ４から構成し、広角端から望遠端への変
倍に際して、第１レンズ群と第４レンズ群は静止し、第
２レンズ群と第３レンズ群はいずれも物体方向に移動
し、第１レンズ群と第２レンズ群との空気間隔は減少
し、第２レンズ群と第３レンズ群との空気間隔は広角端
近傍では拡大し、望遠端近傍では縮小し、第３レンズ群
と第４レンズ群の空気間隔は拡大する。From each aberration diagram, it is apparent that various aberrations are satisfactorily corrected and the image forming performance is excellent in the present embodiment. [Embodiment 7] FIG. 31 is a lens configuration diagram of Embodiment 7, showing the lens configuration at the wide-angle end at the upper portion and at the telephoto end at the lower portion. It is composed of, in order from the object side, a negative first lens group G1, a positive second lens group G2, a positive third lens group G3, and a positive fourth lens group G4, from the wide-angle end to the telephoto end. Upon zooming, the first lens group and the fourth lens group are stationary, the second lens group and the third lens group both move toward the object, and the air gap between the first lens group and the second lens group decreases. The air distance between the second lens group and the third lens group increases near the wide-angle end, decreases near the telephoto end, and the air distance between the third lens group and the fourth lens group increases.
【００４５】第４レンズ群の最も物体側のレンズ面は非
球面であり、非球面形状は次の式で与えられる。 Ｘ（ｙ）＝ｙ2／［ｒ・｛１＋（１−ｋ・ｙ2／ｒ2）1/2｝］ ＋C2・ｙ2＋C4・ｙ4＋C6・ｙ6＋C8・ｙ8＋C10・ｙ10 但し、Ｘ（ｙ）は非球面の頂点における接平面から高さ
ｙにおける非球面上の位置までの光軸方向に沿った距
離、ｒは近軸の曲率半径、ｋは円錐定数、Ciは第ｉ次の
非球面係数である。The most object side lens surface of the fourth lens group is an aspherical surface, and the aspherical shape is given by the following equation. X (y) = y 2 / [r · {1+ (1-k · y 2 / r 2) 1/2}] + C2 · y 2 + C4 · y 4 + C6 · y 6 + C8 · y 8 + C10 · y 10 where , X (y) is the distance along the optical axis from the tangent plane at the apex of the aspherical surface to the position on the aspherical surface at the height y, r is the paraxial radius of curvature, k is the conic constant, and Ci is the i-th The following aspherical coefficients.
【００４６】また、遠距離物体から近距離物体へのフォ
ーカシングは、第２レンズ群を像面側に移動させて行な
う。以下の表７に、本発明における実施例７の諸元の値
を掲げる。実施例の諸元表中のｆは焦点距離、ＦはＦナ
ンバー、 2ωは画角を表す。そして、左端の数字は物体
側からの順序を表し、ｒはレンズ面の曲率半径、ｄはレ
ンズ面間隔、ｎ及びνは屈折率及びアッベ数のｄ線（λ
=587.6nm）に対する値である。また、可変間隔表中のＲ
は撮影距離である。Focusing from a long-distance object to a short-distance object is performed by moving the second lens group to the image plane side. Table 7 below lists values of specifications of Example 7 in the present invention. In the specification table of the embodiment, f is the focal length, F is the F number, and 2ω is the angle of view. The number at the left end represents the order from the object side, r is the radius of curvature of the lens surface, d is the distance between the lens surfaces, n and ν are the refractive index and the Abbe number d line (λ
= 587.6 nm). Also, R in the variable interval table
Is the shooting distance.
【００４７】[0047]
【表７】 図３２、図３３は、それぞれ実施例７の撮影距離Ｒ＝ｉ
ｎｆにおける広角端での諸収差図、望遠端での諸収差図
を示し、図３４、図３５は、それぞれ実施例７の撮影距
離Ｒ＝６００における広角端での諸収差図、望遠端での
諸収差図を示す。各収差図において、ＦNOはＦナンバ
ー、ＮＡは開口数、Ｙは像高、ｄはｄ線（λ=587.6nm）
及びｇはｇ線（λ=435.6nm）を示している。非点収差図
において、実線はサジタル像面を、破線はメリジオナル
像面をそれぞれ示す。[Table 7] 32 and 33 show the shooting distance R = i of the seventh embodiment, respectively.
Various aberration diagrams at the wide-angle end at nf and various aberration diagrams at the telephoto end are shown in FIGS. 34 and 35, respectively, and FIGS. 34 and 35 show various aberration diagrams at the wide-angle end and the telephoto end at the shooting distance R = 600 of Example 7, respectively. The various aberration figures are shown. In each aberration diagram, FNO is the F number, NA is the numerical aperture, Y is the image height, and d is the d line (λ = 587.6 nm).
And g are g lines (λ = 435.6 nm). In the astigmatism diagram, the solid line shows the sagittal image plane, and the broken line shows the meridional image plane.
【００４８】各収差図から、本実施例は諸収差が良好に
補正され、優れた結像性能を有していることが明らかで
ある。From each aberration diagram, it is apparent that various aberrations are satisfactorily corrected and that this embodiment has excellent image forming performance.
【００４９】[0049]
【発明の効果】このように本発明によれば、インナーフ
ォーカス方式を採用しても、同一距離の被写体へのフォ
ーカシングに要するフォーカシングレンズ群の繰り出し
量が、ズームポジションによらずほぼ一定とすることが
可能なズームレンズの提供が可能となり、オートフォー
カス時のレンズ駆動の高速化とマニュアルフォーカス時
の操作性の両立が可能である。また、インナーフォーカ
スの採用により、最も物体側のレンズ群を固定にでき、
防滴カメラ、防水カメラ、防塵カメラ等の撮影レンズと
して利用できる。As described above, according to the present invention, even if the inner focus method is adopted, the amount of extension of the focusing lens group required for focusing on a subject at the same distance is substantially constant regardless of the zoom position. It becomes possible to provide a zoom lens capable of achieving high speed, and it is possible to achieve both high-speed lens drive during autofocus and operability during manual focus. Also, by adopting the inner focus, the lens group closest to the object can be fixed,
It can be used as a shooting lens for drip-proof cameras, waterproof cameras, dust-proof cameras, etc.
【００５０】さらに、いずれかの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、ぶれの補正が可能で
ある。なお、ぶれ補正レンズ群として、比較的小型の第
２レンズ群、あるいは第３レンズ群を選択すると、駆動
機構が小型化でき、好ましい。Further, the blur can be corrected by moving any one of the lens groups in the direction orthogonal to the optical axis. It is preferable to select the relatively small second lens group or the third lens group as the blur correction lens group because the drive mechanism can be downsized.
【図１】本発明の実施例１のレンズ構成図である。FIG. 1 is a lens configuration diagram of a first embodiment of the present invention.
【図２】実施例１の撮影距離Ｒ＝ｉｎｆにおける広角端
での諸収差図。FIG. 2 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = inf of Example 1.
【図３】実施例１の撮影距離Ｒ＝ｉｎｆにおける望遠端
での諸収差図。FIG. 3 is a diagram of various types of aberration at the telephoto end at a shooting distance R = inf of Example 1.
【図４】実施例１の撮影距離Ｒ＝５００における広角端
での諸収差図。FIG. 4 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = 500 according to the first exemplary embodiment.
【図５】実施例１の撮影距離Ｒ＝５００における望遠端
での諸収差図。FIG. 5 is a diagram of various types of aberration at the telephoto end at a shooting distance R = 500 according to the first embodiment.
【図６】本発明の実施例２のレンズ構成図である。FIG. 6 is a lens configuration diagram of a second embodiment of the present invention.
【図７】実施例２の撮影距離Ｒ＝ｉｎｆにおける広角端
での諸収差図。FIG. 7 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = inf of Example 2.
【図８】実施例２の撮影距離Ｒ＝ｉｎｆにおける望遠端
での諸収差図。FIG. 8 is a diagram of various types of aberration at the telephoto end at a shooting distance R = inf of Example 2;
【図９】実施例２の撮影距離Ｒ＝５００における広角端
での諸収差図。FIG. 9 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = 500 according to the second embodiment.
【図１０】実施例２の撮影距離Ｒ＝５００における望遠
端での諸収差図。FIG. 10 is a diagram of various types of aberration at the telephoto end at a shooting distance R = 500 according to the second embodiment.
【図１１】本発明の実施例３のレンズ構成図である。FIG. 11 is a lens configuration diagram of Example 3 of the present invention.
【図１２】実施例３の撮影距離Ｒ＝ｉｎｆにおける広角
端での諸収差図。FIG. 12 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = inf of Example 3.
【図１３】実施例３の撮影距離Ｒ＝ｉｎｆにおける望遠
端での諸収差図。FIG. 13 is a diagram of various types of aberration at the telephoto end at a shooting distance R = inf of Example 3;
【図１４】実施例３の撮影距離Ｒ＝５００における広角
端での諸収差図。FIG. 14 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = 500 according to the third embodiment.
【図１５】実施例３の撮影距離Ｒ＝５００における望遠
端での諸収差図。FIG. 15 is a diagram of various types of aberration at the telephoto end at a shooting distance R = 500 according to the third embodiment.
【図１６】本発明の実施例４のレンズ構成図である。FIG. 16 is a lens configuration diagram of Example 4 of the present invention.
【図１７】実施例４の撮影距離Ｒ＝ｉｎｆにおける広角
端での諸収差図。FIG. 17 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = inf of Example 4.
【図１８】実施例４の撮影距離Ｒ＝ｉｎｆにおける望遠
端での諸収差図。FIG. 18 is a diagram of various types of aberration at the telephoto end at the shooting distance R = inf of Example 4.
【図１９】実施例４の撮影距離Ｒ＝５００における広角
端での諸収差図。FIG. 19 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = 500 according to the fourth embodiment.
【図２０】実施例４の撮影距離Ｒ＝５００における望遠
端での諸収差図。FIG. 20 is a diagram of various types of aberration at the telephoto end at the shooting distance R = 500 according to the fourth embodiment.
【図２１】本発明の実施例５のレンズ構成図である。FIG. 21 is a lens configuration diagram of Example 5 of the present invention.
【図２２】実施例５の撮影距離Ｒ＝ｉｎｆにおける広角
端での諸収差図。FIG. 22 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = inf of Example 5.
【図２３】実施例５の撮影距離Ｒ＝ｉｎｆにおける望遠
端での諸収差図。23 is a diagram of various types of aberration at the telephoto end at the shooting distance R = inf of Example 5. FIG.
【図２４】実施例５の撮影距離Ｒ＝５００における広角
端での諸収差図。FIG. 24 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = 500 according to the fifth embodiment.
【図２５】実施例５の撮影距離Ｒ＝５００における望遠
端での諸収差図。FIG. 25 is a diagram of various types of aberration at the telephoto end at a shooting distance R = 500 according to the fifth embodiment.
【図２６】本発明の実施例６のレンズ構成図である。FIG. 26 is a lens configuration diagram of Example 6 of the present invention.
【図２７】実施例６の撮影距離Ｒ＝ｉｎｆにおける広角
端での諸収差図。27 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = inf of Example 6. FIG.
【図２８】実施例６の撮影距離Ｒ＝ｉｎｆにおける望遠
端での諸収差図。28 is a diagram of various types of aberration at the telephoto end at the shooting distance R = inf of Example 6. FIG.
【図２９】実施例６の撮影距離Ｒ＝５００における広角
端での諸収差図。FIG. 29 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = 500 according to the sixth embodiment.
【図３０】実施例６の撮影距離Ｒ＝５００における望遠
端での諸収差図。FIG. 30 is a diagram of various types of aberration at the telephoto end at a shooting distance R = 500 according to the sixth embodiment.
【図３１】本発明の実施例７のレンズ構成図である。FIG. 31 is a lens configuration diagram of Example 7 of the present invention.
【図３２】実施例７の撮影距離Ｒ＝ｉｎｆにおける広角
端での諸収差図。FIG. 32 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = inf of Example 7.
【図３３】実施例７の撮影距離Ｒ＝ｉｎｆにおける望遠
端での諸収差図。FIG. 33 is a diagram of various types of aberration at the telephoto end at the shooting distance R = inf of Example 7.
【図３４】実施例７の撮影距離Ｒ＝５００における広角
端での諸収差図。FIG. 34 is a diagram of various types of aberration at the wide-angle end at the shooting distance R = 500 according to the seventh embodiment.
【図３５】実施例７の撮影距離Ｒ＝５００における望遠
端での諸収差図。FIG. 35 is a diagram of various types of aberration at the telephoto end at a shooting distance R = 500 according to the seventh embodiment.
Ｇ1 ・・・ 第１レンズ群 Ｇ2 ・・・ 第２レンズ群 Ｇ3 ・・・ 第３レンズ群 Ｇ4 ・・・ 第４レンズ群 Ｇ5 ・・・ 第５レンズ群 Ｓ ・・・ 絞り G1 ... First lens group G2 ... Second lens group G3 ... Third lens group G4 ... Fourth lens group G5 ... Fifth lens group S ...
Claims (27)
１レンズ群と、正の屈折力を有する第２レンズ群と、正
の屈折力を有する第３レンズ群からなり、広角端から望
遠端へのズーミングに際して、前記第１レンズ群が静止
し、前記第２レンズ群と前記第３レンズ群が物体方向に
移動し、前記第２レンズ群と前記第３レンズ群との間隔
が変化し、広角端から望遠端までのいずれの焦点距離状
態においても、第２レンズ群の結像倍率が−１倍となら
ないことを特徴とするズームレンズ。1. A first lens unit having a negative refracting power, a second lens unit having a positive refracting power, and a third lens unit having a positive refracting power, which are arranged in this order from the object side. During zooming to the telephoto end, the first lens group is stationary, the second lens group and the third lens group move toward the object, and the distance between the second lens group and the third lens group changes. A zoom lens characterized in that the image forming magnification of the second lens group does not become -1 in any focal length state from the wide-angle end to the telephoto end.
て遠距離物体から近距離物体へのフォーカシングを行う
ことを特徴とする請求項１に記載のズームレンズ。2. The zoom lens according to claim 1, wherein the second lens group is moved in the image plane direction to perform focusing from a long-distance object to a short-distance object.
記載のズームレンズ。 ｜β２ｔ｜＞２ ｜β２ｗ｜＞２ 但し、β２ｔ：望遠端における前記第２レンズ群の結像
倍率、 β２ｗ：広角端における前記第２レンズ群の結像倍率で
ある。3. The zoom lens according to claim 1, further satisfying the following condition. | Β2t |> 2 | β2w |> 2 where β2t is the imaging magnification of the second lens group at the telephoto end, and β2w is the imaging magnification of the second lens group at the wide-angle end.
記載のズームレンズ。 β２ｔ＞２ β２ｗ＜−２ 但し、β２ｔ：望遠端における前記第２レンズ群の結像
倍率、 β２ｗ：広角端における前記第２レンズ群の結像倍率で
ある。4. The zoom lens according to claim 3, further satisfying the following condition. β2t> 2 β2w <-2 where β2t is the imaging magnification of the second lens group at the telephoto end, and β2w is the imaging magnification of the second lens group at the wide-angle end.
記載のズームレンズ。 ｆ３／ｅ３ｗ ＞ ０．８ ｆ３／ｅ３ｔ ＜ １．２ 但し、ｅ３ｗ：広角端における前記第３レンズ群の像側
主点から像面までの距離、 ｅ３ｔ：望遠端における前記第３レンズ群の像側主点か
ら像面までの距離、 ｆ３：前記第３レンズ群の焦点距離である。5. The zoom lens according to claim 1, further satisfying the following condition. f3 / e3w> 0.8 f3 / e3t <1.2, where e3w: distance from the image-side principal point of the third lens group to the image plane at the wide-angle end, e3t: image of the third lens group at the telephoto end Distance from side principal point to image plane, f3: focal length of the third lens group.
記載のズームレンズ。 ０．５ ＜ ｆ２／ｆ３ ＜ ２ 但し、ｆ２：前記第２レンズ群の焦点距離、 ｆ３：前記第３レンズ群の焦点距離である。6. The zoom lens according to claim 1, further satisfying the following condition. 0.5 <f2 / f3 <2 where f2 is the focal length of the second lens group, and f3 is the focal length of the third lens group.
記載のズームレンズ。 ｆ２／（｜ｆ１｜＋ｅ１ｔ） ＞ ０．８ （ｆ１＜０） ｆ２／（｜ｆ１｜＋ｅ１ｗ） ＜ １．２ 但し、ｆ１：前記第１レンズ群の焦点距離、 ｆ２：前記第２レンズ群の焦点距離、 ｅ１ｗ：広角端における前記第１レンズ群の像側主点か
ら前記第２レンズ群の物側主点までの距離、 ｅ１ｔ：望遠端における前記第１レンズ群の像側主点か
ら前記第２レンズ群の物側主点までの距離である7. The zoom lens according to claim 1, further satisfying the following conditions. f2 / (| f1 | + e1t)> 0.8 (f1 <0) f2 / (| f1 | + e1w) <1.2, where f1: the focal length of the first lens group, and f2: the second lens group. Focal length, e1w: distance from the image-side principal point of the first lens group at the wide-angle end to the object-side principal point of the second lens group, e1t: from the image-side principal point of the first lens group at the telephoto end Distance to the object side principal point of the second lens group
間に絞りを有することを特徴とする請求項１に記載のズ
ームレンズ。8. The zoom lens according to claim 1, further comprising a diaphragm between the second lens group and the third lens group.
て、前記第２レンズ群と前記第３レンズ群の間隔は、広
角端近傍では拡大し、望遠端近傍では縮小することを特
徴とする請求項１に記載のズームレンズ。9. When zooming from the wide-angle end to the telephoto end, the interval between the second lens group and the third lens group increases near the wide-angle end and decreases near the telephoto end. The zoom lens according to 1.
第１レンズ群と、正の屈折力を有する第２レンズ群と、
正の屈折力を有する第３レンズ群を有し、広角端から望
遠端へのズーミングに際して、前記第１レンズ群と前記
第２レンズ群との間隔が縮小し、前記第２レンズ群と前
記第３レンズ群との間隔が変化し、前記第２レンズ群を
像面方向に移動させて遠距離物体から近距離物体へのフ
ォーカシングを行うことを特徴とするズームレンズ。10. A first lens group having a negative refracting power and a second lens group having a positive refracting power in order from the object side,
A third lens group having a positive refractive power is provided, and during zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group is reduced, and the second lens group and the second lens group. A zoom lens characterized in that the distance from the third lens group is changed and the second lens group is moved in the image plane direction to perform focusing from a long-distance object to a short-distance object.
０に記載のズームレンズ。 ｜β２ｔ｜＞２ ｜β２ｗ｜＞２ 但し、β２ｔ：望遠端における前記第２レンズ群の結像
倍率、 β２ｗ：広角端における前記第２レンズ群の結像倍率で
ある。11. The method according to claim 1, further satisfying the following condition.
0 zoom lens. | Β2t |> 2 | β2w |> 2 where β2t is the imaging magnification of the second lens group at the telephoto end, and β2w is the imaging magnification of the second lens group at the wide-angle end.
１に記載のズームレンズ。 β２ｔ＞２ β２ｗ＜−２ 但し、β２ｔ：望遠端における前記第２レンズ群の結像
倍率、 β２ｗ：広角端における前記第２レンズ群の結像倍率で
ある。12. The method according to claim 1, further satisfying the following condition.
The zoom lens according to 1. β2t> 2 β2w <-2 where β2t is the imaging magnification of the second lens group at the telephoto end, and β2w is the imaging magnification of the second lens group at the wide-angle end.
０に記載のズームレンズ。 ｆ３／ｅ３ｗ ＞ ０．８ ｆ３／ｅ３ｔ ＜ １．２ 但し、ｅ３ｗ：広角端における前記第３レンズ群の像側
主点位置から像面までの距離、 ｅ３ｔ：望遠端における前記第３レンズ群の像側主点位
置から像面までの距離、 ｆ３：前記第３レンズ群の焦点距離である。13. The method according to claim 1, further satisfying the following condition.
0 zoom lens. f3 / e3w> 0.8 f3 / e3t <1.2, where e3w: distance from the image-side principal point position of the third lens group at the wide-angle end to the image plane, e3t: of the third lens group at the telephoto end Distance from the image side principal point position to the image plane, f3: Focal length of the third lens group.
０に記載のズームレンズ。 ０．５ ＜ ｆ２／ｆ３ ＜ ２ 但し、ｆ２：前記第２レンズ群の焦点距離、 ｆ３：前記第３レンズ群の焦点距離である。14. The method according to claim 1, further satisfying the following condition.
0 zoom lens. 0.5 <f2 / f3 <2 where f2 is the focal length of the second lens group, and f3 is the focal length of the third lens group.
０に記載のズームレンズ。 ｆ２／（｜ｆ１｜＋ｅ１ｔ） ＞ ０．８ （ｆ１＜０） ｆ２／（｜ｆ１｜＋ｅ１ｗ） ＜ １．２ 但し、ｆ１：前記第１レンズ群の焦点距離、 ｆ２：前記第２レンズ群の焦点距離、 ｅ１ｗ：広角端における前記第１レンズ群の像側主点か
ら前記第２レンズ群の物側主点までの距離、 ｅ１ｔ：望遠端における前記第１レンズ群の像側主点か
ら前記第２レンズ群の物側主点までの距離である15. The method according to claim 1, further satisfying the following condition.
0 zoom lens. f2 / (| f1 | + e1t)> 0.8 (f1 <0) f2 / (| f1 | + e1w) <1.2 where f1: focal length of the first lens group, f2: of the second lens group Focal length, e1w: distance from the image-side principal point of the first lens group at the wide-angle end to the object-side principal point of the second lens group, e1t: from the image-side principal point of the first lens group at the telephoto end Distance to the object side principal point of the second lens group
が静止していることを特徴とする請求項１０に記載のズ
ームレンズ。16. The zoom lens according to claim 10, wherein the first lens group is stationary during zooming.
に、前記第２レンズ群と前記第３レンズ群がともに物体
方向へ移動することを特徴とする請求項１６に記載のズ
ームレンズ。17. The zoom lens according to claim 16, wherein both the second lens group and the third lens group move in the object direction during zooming from the wide-angle end to the telephoto end.
の間に絞りを有することを特徴とする請求項１０に記載
のズームレンズ。18. The zoom lens according to claim 10, further comprising a diaphragm between the second lens group and the third lens group.
して、前記第２レンズ群と前記第３レンズ群の間隔は、
広角端近傍では拡大し、望遠端近傍では縮小することを
特徴とする請求項１０に記載のズームレンズ。19. When zooming from the wide-angle end to the telephoto end, a distance between the second lens group and the third lens group is
The zoom lens according to claim 10, wherein the zoom lens expands near the wide-angle end and contracts near the telephoto end.
第１レンズ群と、正の屈折力を有する第２レンズ群と、
正の屈折力を有する第３レンズ群と、負の屈折力を有す
る第４レンズ群とを有し、広角端から望遠端へのズーミ
ングに際して、前記第１レンズ群と前記第２レンズ群と
の間隔が狭まり、前記第２レンズ群と前記第３レンズ群
との間隔が広がり、前記第３レンズ群と前記第４レンズ
群との間隔が広がることを特徴とするズームレンズ。20. A first lens group having a negative refracting power and a second lens group having a positive refracting power in order from the object side.
It has a third lens group having a positive refractive power and a fourth lens group having a negative refractive power, and when zooming from the wide-angle end to the telephoto end, the first lens group and the second lens group A zoom lens characterized in that an interval is narrowed, an interval between the second lens group and the third lens group is expanded, and an interval between the third lens group and the fourth lens group is expanded.
せて遠距離物体から近距離物体へのフォーカシングを行
うことを特徴とする請求項２０に記載のズームレンズ。21. The zoom lens according to claim 20, wherein the second lens group is moved in the image plane direction to perform focusing from a long-distance object to a short-distance object.
が静止していることを特徴とする請求項２０に記載のズ
ームレンズ。22. The zoom lens according to claim 20, wherein the first lens group is stationary during zooming.
第１レンズ群と、正の屈折力を有する第２レンズ群と、
正の屈折力を有する第３レンズ群と、負の屈折力を有す
る第４レンズ群と、正の屈折力を有する第５レンズ群と
を有し、広角端から望遠端へのズーミングに際して、前
記第１レンズ群と前記第２レンズ群との間隔が狭まり、
前記第２レンズ群と前記第３レンズ群との間隔が変化
し、前記第３レンズ群と前記第４レンズ群との間隔が広
がり、前記第４レンズ群と前記第５レンズ群の間隔が狭
まることを特徴とするズームレンズ。23. A first lens group having a negative refractive power and a second lens group having a positive refractive power in order from the object side.
In zooming from the wide-angle end to the telephoto end, the third lens group having a positive refractive power, the fourth lens group having a negative refractive power, and the fifth lens group having a positive refractive power are provided. The distance between the first lens group and the second lens group is narrowed,
The distance between the second lens group and the third lens group changes, the distance between the third lens group and the fourth lens group increases, and the distance between the fourth lens group and the fifth lens group decreases. This is a zoom lens.
せて遠距離物体から近距離物体へのフォーカシングを行
うことを特徴とする請求項２３に記載のズームレンズ。24. The zoom lens according to claim 23, wherein the second lens group is moved in the image plane direction to perform focusing from a long-distance object to a short-distance object.
が静止していることを特徴とする請求項２３に記載のズ
ームレンズ。25. The zoom lens according to claim 23, wherein the first lens group is stationary during zooming.
第１レンズ群と、正の屈折力を有する第２レンズ群と、
正の屈折力を有する第３レンズ群と、正の屈折力を有す
る第４レンズ群を有し、広角端から望遠端へのズーミン
グに際して、前記第１レンズ群と前記第２レンズ群との
間隔が縮小し、前記第２レンズ群と前記第３レンズ群と
の間隔が変化し、前記第３レンズ群と前記第４レンズ群
との間隔が変化し、前記第２レンズ群を像面方向に移動
させて遠距離物体から近距離物体へのフォーカシングを
行うことを特徴とするズームレンズ。26. A first lens group having a negative refracting power and a second lens group having a positive refracting power in order from the object side,
A third lens group having a positive refracting power and a fourth lens group having a positive refracting power are provided, and the distance between the first lens group and the second lens group during zooming from the wide-angle end to the telephoto end. Is reduced, the distance between the second lens group and the third lens group is changed, the distance between the third lens group and the fourth lens group is changed, and the second lens group is moved in the image plane direction. A zoom lens that is moved to perform focusing from a long-distance object to a short-distance object.
が静止していることを特徴とする請求項２６に記載のズ
ームレンズ。27. The zoom lens according to claim 26, wherein the first lens group is stationary during zooming.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8020930A JPH08304704A (en) | 1995-03-08 | 1996-02-07 | Zoom lens |
| US08/613,254 US5668668A (en) | 1995-03-08 | 1996-03-08 | Zoom lens with five lens groups |
| US08/736,673 US5721642A (en) | 1995-03-08 | 1996-10-25 | Zoom lens |
| US08/736,674 US5798871A (en) | 1995-03-08 | 1996-10-25 | Zoom lens |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-48340 | 1995-03-08 | ||
| JP4834095 | 1995-03-08 | ||
| JP8020930A JPH08304704A (en) | 1995-03-08 | 1996-02-07 | Zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08304704A true JPH08304704A (en) | 1996-11-22 |
Family
ID=26357940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8020930A Pending JPH08304704A (en) | 1995-03-08 | 1996-02-07 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08304704A (en) |
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- 1996-02-07 JP JP8020930A patent/JPH08304704A/en active Pending
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