JPH0519169A - Zoom lens - Google Patents

Zoom lens

Info

Publication number
JPH0519169A
JPH0519169A JP3182859A JP18285991A JPH0519169A JP H0519169 A JPH0519169 A JP H0519169A JP 3182859 A JP3182859 A JP 3182859A JP 18285991 A JP18285991 A JP 18285991A JP H0519169 A JPH0519169 A JP H0519169A
Authority
JP
Japan
Prior art keywords
lens
lens group
wide
angle end
group
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.)
Granted
Application number
JP3182859A
Other languages
Japanese (ja)
Other versions
JP3226297B2 (en
Inventor
Takanori Yamanashi
隆則 山梨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP18285991A priority Critical patent/JP3226297B2/en
Priority to US07/902,818 priority patent/US5416639A/en
Publication of JPH0519169A publication Critical patent/JPH0519169A/en
Application granted granted Critical
Publication of JP3226297B2 publication Critical patent/JP3226297B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G02B15/145—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
    • G02B15/145519—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 -+--+
    • 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
    • G02B15/145527—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

PURPOSE:To obtain a zoom lens for a still camera whose entire length is nearly fixed to attain tightly sealing constitution and also which is very adaptable in the use of a wide-angle system by specifying a first lens group to a fifth lens group so that variable power and an image surface position are nearly fixed, and satisfying a specified condition. CONSTITUTION:The first and the fifth lens groups are fixed with respect to an image-formation surface, and second-forth lens groups are moved, so that the variable power from a wide-angle end to a telephotographic end can be executed. Furthermore, an expression I is satisfied. Provided that in the expression I, phiW is the refracting power of all system at the wide-angle end, phi12W is the synthesized refracting power of the first and the second lens groups at the wide-angle end, phi34W is the synthesized refracting power of the third and the forth lens groups at the wide-angle end, beta3W and beta4W are paraxial lateral magnification owned by the third and the forth lens groups at the wide-angle end, and beta3T and beta4T are the paraxial lateral magnification owned by the third and the forth lens groups at the telephotographic end.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】広角なズームレンズに関するもの
である。TECHNICAL FIELD The present invention relates to a wide-angle zoom lens.

【０００２】[0002]

【従来の技術】従来のいわゆる負先行型の広角なズーム
レンズは、ズーミングを行なうとレンズ系の全長が変化
し、重量の大きい負の屈折力の第１レンズ群が非線型に
移動しかつ移動量が大きく、広角端での全長が長く、又
ズーミング移動時の駆動量の変化によるスムーズさの低
下や重量のバランスの変化などの難点があった。2. Description of the Related Art In a conventional so-called negative-leading type wide-angle zoom lens, when zooming is performed, the entire length of the lens system changes, and the first lens group having a large negative weight and having a negative refractive power moves non-linearly and moves. However, there were problems such as a large amount, a long overall length at the wide-angle end, a decrease in smoothness due to a change in driving amount during zooming movement, and a change in weight balance.

【０００３】一方、ズームレンズを防水や防滴構造にす
ることは、カメラの使用用途を広げ、更には悪天候下の
撮影を行ない得るようにすることは、大きな意味を有す
る。又第１レンズ群のズーミングによる移動の際に、気
付かないうちにレンズ表面を傷つけることのないように
保護し更に拡張された環境で自由に使用できるので好ま
しい。On the other hand, making the zoom lens waterproof or drip-proof has a great meaning to widen the use of the camera and to enable shooting under bad weather conditions. Further, it is preferable because it protects the lens surface from being scratched without being noticed when the first lens group is moved by zooming and can be used freely in an expanded environment.

【０００４】しかし従来の全長可変のズームレンズは、
いわゆる密封構造にすることは難しく、Ｏリング等のパ
ッキンを用いても実現は困難である。However, the conventional variable length zoom lens is
It is difficult to make a so-called sealed structure, and it is difficult to realize it even if a packing such as an O-ring is used.

【０００５】又従来、広角系用として採用されてきた全
長が一定のテレビカメラ用あるいはシネカメラ用の負先
行型のアフォーカルズームレンズは、全長が長く前群の
大きいレンズ系で、スチールカメラ用としては不適当で
ある。Conventionally, a negative lead type afocal zoom lens for a television camera or a cine camera, which has been adopted for a wide angle system, has a long total length and a large front group, and is used for a still camera. Is inappropriate.

【０００６】[0006]

【発明が解決しようとする課題】本発明は、スチールカ
メラ用のズームレンズで、レンズ系を密封構造とするこ
とが可能なようにその全長がほぼ一定であるように構成
し、しかも広角系としても十分に適用し得る変倍比が比
較的大きいレンズ系を提供することを目的としている。SUMMARY OF THE INVENTION The present invention is a zoom lens for a still camera, which has a substantially constant overall length so that the lens system can have a hermetically sealed structure. It is also an object of the present invention to provide a lens system having a relatively large zoom ratio that can be sufficiently applied.

【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、物体側より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、正又は負の屈折力の第４レンズ群と、正の屈折力の
第５レンズ群とよりなり、第１レンズ群と第５レンズ群
とを像面に対してほぼ固定とし、第２レンズ群，第３レ
ンズ群，第４レンズ群を移動させることによって変倍お
よび像面位置をほぼ一定とし、かつ次の各条件を満足す
ることを特徴としている。 （１）０．５＜｜φ12w/φw ｜＜４．０ （２）０．０５＜｜φ34w/φw ｜＜１．５ （３）β3w・β4w＜β3T・β4T ただしφ12w は広角端における第１レンズ群と第２レン
ズ群との合成の屈折力、φ34w は広角端における第３レ
ンズ群と第４レンズ群との合成の屈折力、φw は広角端
における全系の屈折力、β3wは広角端における第３レン
ズ群の近軸倍率、β4wは広角端における第４レンズ群の
近軸倍率、β3Tは望遠端における第３レンズ群の近軸倍
率、β4Tは望遠端における第４レンズ群の近軸倍率であ
る。A zoom lens according to the present invention comprises, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens having a negative refractive power. Group, a fourth lens group having a positive or negative refractive power, and a fifth lens group having a positive refractive power, and the first lens group and the fifth lens group are substantially fixed with respect to the image plane. It is characterized in that the second lens group, the third lens group, and the fourth lens group are moved to make the magnification change and the image plane position substantially constant, and satisfy the following conditions. (1) 0.5 <| φ12w / φw | <4.0 (2) 0.05 <| φ34w / φw | <1.5 (3) β3w ・ β4w <β3T ・ β4T However, φ12w is the first at the wide angle end. The combined refractive power of the lens group and the second lens group, φ34w is the combined refractive power of the third lens group and the fourth lens group at the wide-angle end, φw is the refractive power of the entire system at the wide-angle end, and β3w is the wide-angle end. In the third lens group, β4w is the paraxial magnification of the fourth lens group at the wide-angle end, β3T is the paraxial magnification of the third lens group at the telephoto end, and β4T is the paraxial magnification of the fourth lens group at the telephoto end. It is a magnification.

【０００８】前述のように、本発明のレンズ系は、ズー
ミング操作時に全長の変化が少なく、防水もしくは防滴
構造のメカニズムを実現できるズーミング方式を採用し
た。As described above, the lens system of the present invention adopts the zooming system which can realize the mechanism of the waterproof or drip-proof structure with little change in the total length during the zooming operation.

【０００９】従来のスチールカメラ用広角系ズームレン
ズとして図３３，図３４に示すようなレンズ系が一般的
である。尚図中Ｗ，Ｓ，Ｔは夫々広角端，中間焦点距
離，望遠端を表わす。しかし本発明の目的である広角域
を含むレンズ系で、ズーミング中全長が一定であるズー
ムレンズは、これまでに存在していない。As a conventional wide-angle zoom lens for a still camera, a lens system as shown in FIGS. 33 and 34 is generally used. In the figure, W, S, and T represent the wide-angle end, the intermediate focal length, and the telephoto end, respectively. However, there has been no zoom lens which is the object of the present invention and which has a constant total length during zooming and which has a wide-angle range.

【００１０】その理由として、図３３のようなズーム比
が２以下の、いわゆる標準ズームレンズは、ほぼ負先行
の２群ズームレンズ又はそれに第３レンズ群としてフィ
ールドフラットナーを付加した２群ズームレンズの拡張
型である。更にズーム比が大になると、図３４のよう
に、２群ズームレンズをダブル化した４群ズームレンズ
である。しかしこれらは、いずれもレンズ系の全長が変
化する。そこで広角域の画角を包括しながら、レンズ系
の第１面からフィルム面までがズーミング中ほぼ一定
で、レンズ鏡胴内での媒質（空気）の容積変化が小さく
てズーミング時の駆動トルクが問題にならないズームレ
ンズの開発が必要である。The reason for this is that a so-called standard zoom lens having a zoom ratio of 2 or less as shown in FIG. 33 is a substantially negative leading two-group zoom lens or a two-group zoom lens in which a field flattener is added as a third lens group. Is an extended type of. When the zoom ratio is further increased, as shown in FIG. 34, it is a four-group zoom lens in which the two-group zoom lens is doubled. However, in all of these, the total length of the lens system changes. Therefore, while covering the angle of view in a wide angle range, the first surface of the lens system to the film surface is almost constant during zooming, the volume change of the medium (air) in the lens barrel is small, and the driving torque during zooming is small. It is necessary to develop a zoom lens that does not pose a problem.

【００１１】又広角系ズームレンズは、一眼レフレック
スカメラ用を想定すると、物体側より順に負の第１レン
ズ群と正の第２レンズ群を配置したレトロフォーカスタ
イプにすることによって、ミラーを配置するスペースを
確保出来るパワー配置にすることが出来る。Assuming that the wide-angle zoom lens is for a single-lens reflex camera, the mirror is arranged by adopting a retrofocus type in which a negative first lens group and a positive second lens group are arranged in order from the object side. It is possible to have a power arrangement that secures the space to be used.

【００１２】一方この２群ズームレンズは、第２レンズ
群で変倍を行なうと、必然的に第１レンズ群によって像
面位置を補正しなければならず、そのため変倍の際に第
１レンズ群を移動させなければならない。したがて前記
の本発明の目的の一つが達成されない。On the other hand, in this two-group zoom lens, when the second lens group is used for zooming, the image plane position must be corrected by the first lens group, and therefore the first lens is used for zooming. You have to move the group. Therefore, one of the above-mentioned objects of the present invention is not achieved.

【００１３】本発明のレンズ系は、広角端では、全体と
してレトロフォーカスタイプでありながら、複数のレン
ズ群よりなりズーミング時に第１レンズ群が固定で、第
２レンズ群，第３レンズ群，第４レンズ群とを少なくと
も有し、これら第２レンズ群から第４レンズ群のうちの
いずれかが変倍系，コンペンセーター役割を有するもの
である。更に、必要に応じて最終レンズ群として像面に
対して固定である第５レンズ群を設けるようにした。At the wide-angle end, the lens system of the present invention is a retrofocus type as a whole, but is composed of a plurality of lens groups, the first lens group is fixed during zooming, and the second lens group, the third lens group, and the third lens group. At least four lens groups, and any one of the second lens group to the fourth lens group has a variable power system and a compensator role. Further, a fifth lens group, which is fixed to the image plane, is provided as the final lens group, if necessary.

【００１４】また、収差補正上から一つのレンズ群を二
つに分けて夫々に倍率を分担させて倍率負担を軽減させ
て収差補正の自由度を大にすることも考慮した。In view of aberration correction, it is also considered that one lens group is divided into two and the respective magnifications are shared to reduce the burden of magnification and increase the degree of freedom in aberration correction.

【００１５】更に変倍比が３程度以上になるようにする
ために第２レンズ群〜第４レンズ群のすべてを変倍の際
に可動にした。Further, in order to obtain a zoom ratio of about 3 or more, all of the second lens group to the fourth lens group are movable during zooming.

【００１６】以上のようにして、本発明は、前述の構成
すすると共に、前記条件（１），（２），（３）を満足
するようにした。As described above, the present invention is configured as described above and satisfies the above conditions (1), (2), and (3).

【００１７】以上のようにして、本発明のズームレンズ
は、広角域では特にレトロフォーカスタイプの特性を強
く持ち十分なバックフォーカスをとることが可能になっ
た。As described above, the zoom lens according to the present invention has a strong retrofocus type characteristic particularly in a wide angle range and can achieve a sufficient back focus.

【００１８】また本発明のレンズ系の変倍時における各
レンズ群の移動は、図２９、図３０、図３１に示す通り
で、第２レンズ群と、第４レンズ群の移動量が大きく、
第３レンズ群は像面位置を一定にするためのコンペンセ
ーターとしての役割に適している。各レンズ群のズーミ
ング時の移動に関しては、広角端から望遠端にかけて、
第１レンズ群と第２レンズ群の間隔が縮小し、第２レン
ズ群と第３レンズ群の間隔は拡大し、第３レンズ群と第
４レンズ群の間隔が縮小するように各レンズ群が移動す
る。また一般の２群ズームレンズにおいては、後群の倍
率が等倍以下の時は、広角端でレンズ系の全長が最も長
くなる。これに対して、本発明のズームレンズは、変倍
域全体として全長がより短いことが一つの大きな特徴と
なっている。その理由として望遠側での全長が長くなり
望遠比を大きく出来るので、このタイプのレンズ系で問
題になる望遠側での球面収差の補正を始めとする収差補
正への負担が少なくなるからである。逆に広角端では、
全長が短縮する傾向となり、入射瞳距離も短くなるの
で、その結果周辺光量を確保しやすくなり超広角化を実
現する上で有利である。The movement of each lens group during zooming of the lens system of the present invention is as shown in FIGS. 29, 30 and 31, and the movement amounts of the second lens group and the fourth lens group are large,
The third lens group is suitable as a compensator for keeping the image plane position constant. Regarding the movement of each lens group 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, the distance between the second lens group and the third lens group is increased, and the distance between the third lens group and the fourth lens group is reduced. Moving. In a general two-group zoom lens, when the magnification of the rear group is equal to or less than the same, the total length of the lens system becomes the longest at the wide-angle end. On the other hand, the zoom lens of the present invention is characterized in that the overall length of the zooming range is shorter. The reason is that the overall length on the telephoto side can be increased and the telephoto ratio can be increased, so that the burden on aberration correction including spherical aberration correction on the telephoto side, which is a problem with this type of lens system, is reduced. . Conversely, at the wide-angle end,
Since the total length tends to be shortened and the entrance pupil distance is also shortened, as a result, it is easy to secure the peripheral light amount, which is advantageous in achieving a super wide angle.

【００１９】次に前記の条件について説明する。Next, the above conditions will be described.

【００２０】条件（１），（２）は、第１レンズ群から
第４レンズ群の屈折力について定めた条件である。その
うち条件（１）は、広角端における第１レンズ群と第２
レンズ群との合成の屈折力を規定した条件で、その下限
を越えると収差補正上は有利であるが全長が長くなり望
ましくない。又上限を越えると収差補正上好ましくな
い。特に歪曲収差を補正する上で第１レンズ群は重要で
あり、広角端での収差補正に対する影響が大きい。又解
像力を上げる上では倍率色収差にも注意が必要である。
また球面収差とコマ収差の補正には光線高の高くなる第
２レンズ群が重要であり、第１レンズ群と第２レンズ群
の屈折力を適正な値にすることが色収差のバランスの上
で重要である。The conditions (1) and (2) are conditions defined for the refractive powers of the first lens group to the fourth lens group. The condition (1) is the first lens group and the second lens group at the wide-angle end.
If the lower limit of the refractive power of the lens group is defined, it is advantageous for aberration correction, but the total length becomes long, which is not desirable. On the other hand, if the upper limit is exceeded, it is not preferable for aberration correction. In particular, the first lens group is important in correcting distortion, and has a large effect on aberration correction at the wide-angle end. Also, in order to increase the resolution, it is necessary to pay attention to lateral chromatic aberration.
In addition, the second lens group having a high ray height is important for correcting spherical aberration and coma, and it is necessary to set the refracting powers of the first lens group and the second lens group to appropriate values in order to balance chromatic aberration. is important.

【００２１】次に条件（２）は、第３レンズ群と第４レ
ンズ群との合成の屈折力を規定するものである。この条
件（２）の下限を越えるとズーミング移動量が大になり
好ましくない。又条件（２）の上限を越えると、注目す
るレンズ群が結像系であり、特に像面補正に関する収差
の補正が困難になる。The condition (2) defines the combined refractive power of the third lens unit and the fourth lens unit. If the lower limit of this condition (2) is exceeded, the amount of zooming movement becomes large, which is not preferable. If the upper limit of the condition (2) is exceeded, the lens group of interest will be the image forming system, and it will be difficult to correct aberrations particularly relating to image plane correction.

【００２２】次に本発明において、固定群として第５レ
ンズ群を配置すると効果的であり、その作用はリレー系
としてよりも像面湾曲を補正するためのフィールドフラ
ットナーである。また広角端のレンズ系の焦点距離は、
本発明の主旨から考え、画面の対角線長より短いのが一
般的である。つまり下記の関係を満足することが一般的
である。 ｆw ＜Ｄ ただしｆw はレンズ系全系の焦点距離、Ｄは画面対角線
長である。Next, in the present invention, it is more effective to dispose the fifth lens group as a fixed group, and its action is a field flattener for correcting field curvature than that of a relay system. The focal length of the lens system at the wide-angle end is
In consideration of the gist of the present invention, it is generally shorter than the diagonal length of the screen. That is, it is common to satisfy the following relationships. fw <D where fw is the focal length of the entire lens system, and D is the diagonal length of the screen.

【００２３】次に本発明レンズ系における結像関係につ
いて述べる。それは各レンズ群の屈折力と移動に関係し
てくる。ここで共通することは、第２レンズ群の倍率が
広角端から望遠端へかけて増加することである。そのた
めに、この第２レンズ群はリードカムとして用いるのに
適している。Next, the image formation relationship in the lens system of the present invention will be described. It is related to the refractive power and movement of each lens group. What is common here is that the magnification of the second lens group increases from the wide-angle end to the telephoto end. Therefore, this second lens group is suitable for use as a lead cam.

【００２４】また第３レンズ群と第４レンズ群の倍率の
相互の倍率積β ３・β ４は増倍関係にある。倍率β4 は
増倍関係にある。つまり前群としての第１レンズ群と第
２レンズ群とが増倍関係にあり、かつ第３レンズ群と第
４レンズ群とで増倍関係にあり、相互に変倍を効率化し
ていることがわかる。The magnification of the third lens group and the fourth lens group
Mutual multiplication product β 3.β 4 is related to multiplication. Magnification β4 is
There is a multiplication relationship. That is, the first lens group as the front group and the first lens group
The second lens group has a multiplication relation, and the third lens group and the third lens group
There is a multiplication relationship with the 4 lens groups, making mutual variable magnification efficient
You can see that

【００２５】更に本発明のレンズ系は、収差補正に関し
ては次に述べるような特徴を有している。Further, the lens system of the present invention has the following features regarding aberration correction.

【００２６】本発明のレンズ系は、開口絞りを第３レン
ズ群に配置したことと負先行型であることも特徴の一つ
である。The lens system of the present invention is also characterized in that the aperture stop is arranged in the third lens group and that it is of the negative leading type.

【００２７】諸収差のズーミング時の変化は、第１レン
ズ群と第２レンズ群が比較的大きく、第３レンズ群以降
のレンズ群においては比較的少ない。これはズーミング
のタイプに依存するもので、レンズ系の仕様には必ずし
も依存しない。それは、開口絞りを第３レンズ群内に配
置すると仮定すると、入射瞳位置から離れている第１レ
ンズ群においては、光線高の高い軸外光線の影響が大き
くなる傾向にあり、この部分で変倍時に光束の通過状況
が変化するためである。これは、画角の大きい広角端で
顕著であり、特に歪曲収差が負変位する傾向が大であ
る。したがってこの部分でのレンズ構成が重要であり、
この部分での残存収差を出来る限り縮小する必要があ
る。Changes in various aberrations during zooming are relatively large in the first lens group and the second lens group, and relatively small in the lens groups after the third lens group. This depends on the type of zooming, not necessarily on the specifications of the lens system. Assuming that the aperture stop is arranged in the third lens group, the effect of off-axis rays having a high ray height tends to be large in the first lens group distant from the position of the entrance pupil, and there is a change in this portion. This is because the passing state of the light flux changes at the time of doubling. This is remarkable at the wide-angle end where the angle of view is large, and particularly the distortion tends to be negatively displaced. Therefore, the lens configuration in this part is important,
It is necessary to reduce the residual aberration in this portion as much as possible.

【００２８】一方、本発明のレンズ系は、負先行型であ
るために、第２レンズ群に入射する軸上光線は高くなる
ので、主として球面収差，コマ収差，軸上色収差への第
２レンズ群の影響力は大である。そのため望遠側での口
径比の制約が一つの特徴である。On the other hand, since the lens system of the present invention is of the negative leading type, the axial ray incident on the second lens group becomes high, and therefore the second lens mainly for spherical aberration, coma aberration and axial chromatic aberration. The influence of the group is great. Therefore, one of the features is the restriction of the aperture ratio on the telephoto side.

【００２９】また本発明のレンズ系は、全焦点域での全
長をほぼ一定にしたので、条件（１）により広角端の全
長は、第１レンズ群が可動であるタイプのレンズ系に比
べて、短くなるような屈折力配置になり、逆に望遠側で
は第１レンズ群可動のズームレンズに比べ長くなる傾向
になる。これが従来のズームタイプとの特性上の相違で
ある。つまり望遠比が稼げる望遠域では、収差補正上有
利である。In addition, since the lens system of the present invention has a substantially constant total length in the entire focal range, the total length at the wide-angle end is set to the condition (1) as compared with the lens system of the type in which the first lens unit is movable. The refracting power arrangement becomes shorter, and conversely, it tends to be longer on the telephoto side than in the zoom lens in which the first lens group is movable. This is a characteristic difference from the conventional zoom type. That is, in the telephoto range where the telephoto ratio can be earned, it is advantageous for aberration correction.

【００３０】更に各群の移動量は、変倍比にも依存する
が第２レンズ群は必ず増倍する特性をもち、又本発明で
は、第３レンズ群と第４レンズ群の合成の倍率β3 ・β
4も増倍するように構成してある。このことを条件式で
示したのが条件（３）である。ただし、第３レンズ群
は、変倍と収差補正の役割以外に、像面を一定にする作
用を持たせると都合がよい。Further, the amount of movement of each group depends on the zooming ratio, but the second lens group has a characteristic of always multiplying, and in the present invention, the composite magnification of the third lens group and the fourth lens group is used. β3 ・ β
4 is also configured to multiply. Condition (3) shows this with a conditional expression. However, it is convenient for the third lens group to have a function of making the image surface constant, in addition to the role of zooming and aberration correction.

【００３１】そしてこのレンズ群は、望遠域で移動が非
線型になり変曲点を持つこともある。This lens group may have a non-linear movement in the telephoto range and may have an inflection point.

【００３２】また第２レンズ群の倍率の関係を条件式で
示すと下記の通りである。 β2w＜β2T また移動の関係は、次の通りである。図３２にズーミン
グ時の第２、第３、第４レンズ群の移動量の関係を示し
てある。尚各実施例の移動量ｘ２、ｘ３、ｘ４は後に示
す。Further, the relationship of the magnification of the second lens group is shown by a conditional expression as follows. β2w <β2T Furthermore, the relationship of movement is as follows. FIG. 32 shows the relationship between the movement amounts of the second, third, and fourth lens groups during zooming. The movement amounts x2, x3, and x4 in each embodiment will be shown later.

【００３３】本発明のレンズ系は、第２レンズ群の移動
量ｘ2 と第４レンズ群との移動量ｘ4 との比ｘ2/x4 は
次の条件の範囲内である。 ０．７＜ｘ2/x4 ＜１０．０ この条件の下限を越えると第２レンズ群の相対的移動量
が減少するため変倍比を高くすることが難しく、第３レ
ンズ群と第４レンズ群に対する倍率負担が大きくなり望
ましくない。また上限を越えると第２レンズ群の移動量
が増えズーミングの際の収差変動が大きくなってくるの
で望ましくない。In the lens system of the present invention, the ratio x2 / x4 between the movement amount x2 of the second lens unit and the movement amount x4 of the fourth lens unit is within the following conditions. 0.7 <x2 / x4 <10.0 If the lower limit of this condition is exceeded, it is difficult to increase the zoom ratio because the relative movement amount of the second lens group decreases, and the third lens group and the fourth lens group It is not desirable because the burden on the magnification becomes large. On the other hand, if the upper limit is exceeded, the amount of movement of the second lens group increases and the variation in aberration during zooming increases, which is not desirable.

【００３４】次に本発明のレンズ系における各レンズ群
の構成について述べる。Next, the structure of each lens group in the lens system of the present invention will be described.

【００３５】負の屈折力の第１レンズ群は、広角端にお
いて入射瞳距離が比較的長いので、負のレンズ成分を先
頭に配置して入射角を小さくすることが好ましい。勿論
歪曲収差を補正するために正のレンズ成分を前に出すこ
とも考えられるが外径が大になるので好ましくない。し
たがって負のレンズ，正のレンズ成分のように配置して
収差のバランスをとることが好ましい。この場合広角端
では、絶対量の大きい負の歪曲収差が発生するため非球
面を用いることが好ましく、これによってレンズ系の超
広角化が可能になる。Since the first lens group having a negative refractive power has a relatively long entrance pupil distance at the wide-angle end, it is preferable to arrange the negative lens component at the front to reduce the incident angle. Of course, it is conceivable to bring a positive lens component forward in order to correct distortion, but this is not preferable because the outer diameter becomes large. Therefore, it is preferable that the negative lens and the positive lens component are arranged to balance aberrations. In this case, it is preferable to use an aspherical surface because negative distortion aberration having a large absolute amount is generated at the wide-angle end, which enables the lens system to have a super wide angle.

【００３６】入射瞳は、一般に広角端において長いが広
角端から望遠端までレンズ系の全長が一定になるような
屈折力配置にするためには、入射瞳が広角端においてよ
り短く望遠端においてより長くなる点で従来のズームレ
ンズとは異なっている。その結果、入射位置は比較的短
くなり、フィルター径が小さくなり前玉径も小さくなる
と云う長所を有している。しかし望遠端においては入射
瞳位置がより長くなるので、画角が狭くなるのが問題が
ない。The entrance pupil is generally long at the wide-angle end, but in order to have a refractive power arrangement such that the total length of the lens system is constant from the wide-angle end to the telephoto end, the entrance pupil is shorter at the wide-angle end and more It is different from the conventional zoom lens in that it becomes longer. As a result, the incident position is relatively short, the filter diameter is small, and the front lens diameter is also small. However, since the entrance pupil position becomes longer at the telephoto end, there is no problem that the angle of view becomes narrow.

【００３７】次に第２レンズ群は、特に球面収差やコマ
収差の補正に大きな役割を持っている。それはこのレン
ズ群において相対的口径比が大きくなるためである。更
に軸上色収差も補正して中心のコントラスト，解像力を
向上させるために重要である。以上のことから通常正レ
ンズと負レンズとを貼合わせたダブレットと正レンズと
の組合わせが必要であるが３枚接合レンズを用いれば効
果的である。Next, the second lens group plays a large role especially in correcting spherical aberration and coma. This is because the relative aperture ratio becomes large in this lens group. Furthermore, it is important to correct axial chromatic aberration and improve center contrast and resolution. From the above, it is usually necessary to combine a doublet in which a positive lens and a negative lens are attached and a positive lens, but it is effective to use a triplet cemented lens.

【００３８】又第３レンズ群は、正のレンズ成分と負の
レンズ成分よりなり、コンペンセーターとしての作用を
持たせてあり、第４レンズ群とはフローティングンして
いる関係にある。The third lens group is composed of a positive lens component and a negative lens component, has an action as a compensator, and has a floating relationship with the fourth lens group.

【００３９】第４レンズ群は、正のレンズ成分と負のレ
ンズ成分とで構成し、変倍に加えて結像作用を有してい
る。The fourth lens group is composed of a positive lens component and a negative lens component, and has an image forming action in addition to the zooming.

【００４０】更に第５レンズ群は、第１レンズ群から第
４レンズ群までの残存収差、特に残存像面湾曲を微妙に
補正する正のレンズ成分よりなる。Further, the fifth lens group is composed of a positive lens component which subtly corrects residual aberrations from the first lens group to the fourth lens group, particularly residual curvature of field.

【００４１】[0041]

【実施例】次に本発明のズームレンズの各実施例を示
す。 実施例１ ｆ＝21.7〜49.1, F/4.5〜F/5.8, 2ω=89.7°〜47.5° ｒ1 ＝170.9797 ｄ1 ＝1.1000 ｎ1 ＝1.83481 ν1 ＝42.72 ｒ2 ＝26.4545 （非球面）ｄ2 ＝4.3702 ｒ3 ＝137.3708 ｄ3 ＝3.2516 ｎ2 ＝1.84666 ν2 ＝23.78 ｒ4 ＝-216.0576 ｄ4 ＝0.1200 ｒ5 ＝-375.6913 ｄ5 ＝1.1000 ｎ3 ＝1.69680 ν3 ＝55.52 ｒ6 ＝20.8564 （非球面）ｄ6 ＝3.0928 ｒ7 ＝32.7988 ｄ7 ＝1.1000 ｎ4 ＝1.83481 ν4 ＝42.72 ｒ8 ＝24.5952 ｄ8 ＝0.1500 ｒ9 ＝25.0765 ｄ9 ＝6.4614 ｎ5 ＝1.64769 ν5 ＝33.80 ｒ10＝4915.9863 ｄ10＝Ｄ１（可変） ｒ11＝68.2574 ｄ11＝1.4583 ｎ6 ＝1.80400 ν6 ＝46.57 ｒ12＝110.1335 ｄ12＝0.1200 ｒ13＝62.8476 ｄ13＝3.6724 ｎ7 ＝1.84666 ν7 ＝23.88 ｒ14＝23.5782 ｄ14＝3.3820 ｎ8 ＝1.69680 ν8 ＝56.49 ｒ15＝250.1688 ｄ15＝0.1000 ｒ16＝24.6446 ｄ16＝3.9206 ｎ9 ＝1.61700 ν9 ＝62.79 ｒ17＝-103.4564 ｄ17＝Ｄ２（可変） ｒ18＝∞（絞り） ｄ18＝1.0000 ｒ19＝-228.5059 ｄ19＝1.6067 ｎ10＝1.84666 ν10＝23.88 ｒ20＝-29.6935 ｄ20＝1.3807 ｎ11＝1.50378 ν11＝66.81 ｒ21＝-20.6660 ｄ21＝0.2447 ｒ22＝-18.8590 ｄ22＝1.1000 ｎ12＝1.74320 ν12＝49.31 ｒ23＝26.0834 ｄ23＝Ｄ３（可変） ｒ24＝-180.3876 ｄ24＝3.1619 ｎ13＝1.60300 ν13＝65.48 ｒ25＝-23.5483 ｄ25＝0.1000 ｒ26＝1970.0412 ｄ26＝5.2686 ｎ14＝1.49700 ν14＝81.61 ｒ27＝-16.9041 ｄ27＝0.1670 ｒ28＝-16.8370 ｄ28＝1.1000 ｎ15＝1.83400 ν15＝37.16 ｒ29＝-51.9298 ｄ29＝Ｄ４（可変） ｒ30＝-92.3954 ｄ30＝3.2285 ｎ16＝1.61700 ν16＝62.79 ｒ31＝-38.2959 非球面係数 （第２面）Ｐ＝1.0000，Ｅ＝-0.17510×10-4，Ｆ＝-0.1
3193×10-7 Ｇ＝0.56055 ×10-10，Ｈ＝-0.77772×10-13 （第６面）Ｐ＝1.0000，Ｅ＝0.81144 ×10-5，Ｆ＝-0.2
2960×10-9 Ｇ＝-0.12606×10-9，Ｈ＝0.91554 ×10-13 ｆ 21.7 32.8 49.1 Ｄ1 24.295 10.044 1.553 Ｄ2 1.700 5.823 12.218 Ｄ3 9.348 9.115 2.870 Ｄ4 0.880 11.241 19.580 φ12w/φw ＝1.261 ，φ34w/φw ＝-0.1957 ，β2w＝-
0.5723 ，β2T＝-1.1200 β3wβ4w＝1.94446 ，β3Tβ4T＝4.0916，ｘ2/ｘ4 ＝1.
216 実施例２ ｆ＝24.3〜77.7, F/4.6〜F/5.8, 2ω=83.3°〜31.1° ｒ1 ＝107.2744 ｄ1 ＝1.0000 ｎ1 ＝1.83400 ν1 ＝37.16 ｒ2 ＝33.0005 ｄ2 ＝6.0916 ｒ3 ＝391.8495 ｄ3 ＝4.0680 ｎ2 ＝1.68893 ν2 ＝31.08 ｒ4 ＝-78.8483 ｄ4 ＝0.1200 ｒ5 ＝328.1877 ｄ5 ＝1.0000 ｎ3 ＝1.83481 ν3 ＝42.72 ｒ6 ＝39.0346 ｄ6 ＝2.4526 ｒ7 ＝88.1390 ｄ7 ＝1.3195 ｎ4 ＝1.49700 ν4 ＝81.61 ｒ8 ＝21.9240 ｄ8 ＝3.7217 ｎ5 ＝1.84666 ν5 ＝23.78 ｒ9 ＝32.4661 ｄ9 ＝Ｄ１（可変） ｒ10＝40.1886 ｄ10＝2.3684 ｎ6 ＝1.49700 ν6 ＝81.61 ｒ11＝71.8883 ｄ11＝0.1200 ｒ12＝42.8479 ｄ12＝3.1911 ｎ7 ＝1.84666 ν7 ＝23.88 ｒ13＝18.8614 ｄ13＝4.5062 ｎ8 ＝1.69680 ν8 ＝55.52 ｒ14＝-188.0267 ｄ14＝0.1200 ｒ15＝24.9476 ｄ15＝3.2335 ｎ9 ＝1.69680 ν9 ＝55.52 ｒ16＝2564.0158 ｄ16＝Ｄ２（可変） ｒ17＝∞（絞り） ｄ17＝0.6147 ｒ18＝-147.5174 ｄ18＝1.8812 ｎ10＝1.84666 ν10＝23.88 ｒ19＝-18.8152 ｄ19＝1.0000 ｎ11＝1.83481 ν11＝42.72 ｒ20＝77.2279 ｄ20＝0.5264 ｒ21＝-68.8248 ｄ21＝1.0000 ｎ12＝1.69680 ν12＝55.52 ｒ22＝27.0982 ｄ22＝Ｄ３（可変） ｒ23＝752.3348 ｄ23＝3.7442 ｎ13＝1.56907 ν13＝71.30 ｒ24＝-21.9848 ｄ24＝0.1200 ｒ25＝55.3467 ｄ25＝5.2307 ｎ14＝1.49700 ν14＝81.61 ｒ26＝-19.2854 ｄ26＝1.0000 ｎ15＝1.83400 ν15＝37.16 ｒ27＝-378.8459 ｄ27＝Ｄ４（可変） ｒ28＝1657.0512 ｄ28＝2.7117 ｎ16＝1.83481 ν16＝42.72 ｒ29＝-97.0075 ｆ 24.3 43.6 77.7 Ｄ1 30.533 12.899 2.000 Ｄ2 2.000 5.433 12.592 Ｄ3 10.768 7.588 1.344 Ｄ4 1.150 18.531 28.514 φ12w/φw ＝1.800 ，φ34w/φw ＝-0.4140 ，β2w＝-
0.4388 ，β2T＝-1.0160 β3wβ4w＝2.8178，β3Tβ4T＝3.2700，ｘ2/ｘ4 ＝1.04
1 実施例３ ｆ＝40.2〜59.8, F/2.2〜F/2.1, 2ω=56.6°〜39.7° ｒ1 ＝4687.3004 ｄ1 ＝1.0659 ｎ1 ＝1.83400 ν1 ＝37.16 ｒ2 ＝45.8358 ｄ2 ＝3.8079 ｒ3 ＝229.7202 ｄ3 ＝1.6132 ｎ2 ＝1.59551 ν2 ＝39.21 ｒ4 ＝83.4386 ｄ4 ＝0.5371 ｒ5 ＝52.4821 ｄ5 ＝4.6611 ｎ3 ＝1.84666 ν3 ＝23.78 ｒ6 ＝501.6307 ｄ6 ＝2.9855 ｒ7 ＝-74.9661 ｄ7 ＝1.1233 ｎ4 ＝1.53113 ν4 ＝62.44 ｒ8 ＝145.1070 ｄ8 ＝1.3367 ｎ5 ＝1.74000 ν5 ＝28.29 ｒ9 ＝165.9146 ｄ9 ＝Ｄ１（可変） ｒ10＝141.5455 ｄ10＝5.1678 ｎ6 ＝1.80610 ν6 ＝40.95 ｒ11＝-73.4960 ｄ11＝0.6914 ｒ12＝65.2771 ｄ12＝1.5768 ｎ7 ＝1.83400 ν7 ＝37.16 ｒ13＝43.8078 ｄ13＝9.1667 ｎ8 ＝1.69680 ν8 ＝55.52 ｒ14＝-43.8874 ｄ14＝1.7200 ｎ9 ＝1.84666 ν9 ＝23.78 ｒ15＝-615.6574 ｄ1 ＝Ｄ２（可変） ｒ16＝∞（絞り） ｄ16＝4.1118 ｒ17＝93.4452 ｄ17＝2.4287 ｎ10＝1.80518 ν10＝25.43 ｒ18＝47.9971 ｄ18＝1.4966 ｒ19＝30.8331 ｄ19＝3.4154 ｎ11＝1.53172 ν11＝48.90 ｒ20＝99.3872 ｄ20＝2.4598 ｒ21＝-39.9044 ｄ21＝1.4714 ｎ12＝1.60311 ν12＝60.70 ｒ22＝23.8495 ｄ22＝3.3323 ｎ13＝1.84666 ν13＝23.78 ｒ23＝54.7600 ｄ23＝Ｄ３（可変） ｒ24＝-3276.4132 ｄ24＝1.3122 ｎ14＝1.80518 ν14＝25.43 ｒ25＝54.6188 ｄ25＝0.5381 ｒ26＝96.7077 ｄ26＝1.2188 ｎ15＝1.84666 ν15＝23.78 ｒ27＝44.4318 ｄ27＝6.9330 ｎ16＝1.62280 ν16＝57.06 ｒ28＝-30.7540 ｄ28＝0.0630 ｒ29＝69.3400 ｄ29＝5.9497 ｎ17＝1.80610 ν17＝40.95 ｒ30＝-2091.2177 ｆ 40.2 50.1 59.8 Ｄ1 17.698 8.738 2.261 Ｄ2 2.031 10.660 17.707 Ｄ3 7.034 5.254 2.087 φ12w/φw ＝0.7229，φ34w/φw ＝0.482 ，β2w＝-1.0
300 ，β2T＝-1.675 β3wβ4w＝0.7289，β3Tβ4T＝23.5560 ，ｘ2/ｘ4 ＝3.
0233 実施例４ ｆ＝40.1〜59.9, F/2.2〜F/2.2, 2ω=56.7°〜39.7° ｒ1 ＝7066.1589 ｄ1 ＝1.1762 ｎ1 ＝1.83400 ν1 ＝37.16 ｒ2 ＝45.3679 ｄ2 ＝3.8512 ｒ3 ＝234.2121 ｄ3 ＝1.6140 ｎ2 ＝1.59551 ν2 ＝39.21 ｒ4 ＝81.1349 ｄ4 ＝0.4993 ｒ5 ＝53.0793 ｄ5 ＝4.6837 ｎ3 ＝1.84666 ν3 ＝23.78 ｒ6 ＝563.0834 ｄ6 ＝2.4928 ｒ7 ＝-95.0232 ｄ7 ＝1.1991 ｎ4 ＝1.53113 ν4 ＝62.44 ｒ8 ＝202.8226 ｄ8 ＝1.3991 ｎ5 ＝1.74000 ν5 ＝28.29 ｒ9 ＝134.4132 ｄ9 ＝Ｄ１（可変） ｒ10＝105.7047 ｄ10＝5.2659 ｎ6 ＝1.80610 ν6 ＝40.95 ｒ11＝-82.9131 ｄ11＝0.7038 ｒ12＝57.6589 ｄ12＝1.5955 ｎ7 ＝1.83400 ν7 ＝37.16 ｒ13＝44.7414 ｄ13＝9.1937 ｎ8 ＝1.69680 ν8 ＝55.52 ｒ14＝-48.9894 ｄ14＝1.8041 ｎ9 ＝1.84666 ν9 ＝23.78 ｒ15＝-3333.4457 ｄ15＝Ｄ２（可変） ｒ16＝∞（絞り） ｄ16＝4.1772 ｒ17＝101.5239 ｄ17＝2.5241 ｎ10＝1.80518 ν10＝25.43 ｒ18＝45.9697 ｄ18＝1.6219 ｒ19＝34.5520 ｄ19＝3.5052 ｎ11＝1.53172 ν11＝48.90 ｒ20＝124.3129 ｄ20＝2.4994 ｒ21＝-38.4675 ｄ21＝1.5667 ｎ12＝1.60311 ν12＝60.70 ｒ22＝23.5327 ｄ22＝3.4095 ｎ13＝1.84666 ν13＝23.78 ｒ23＝61.0593 ｄ23＝Ｄ３（可変） ｒ24＝-504.2578 ｄ24＝1.3495 ｎ14＝1.80518 ν14＝25.43 ｒ25＝53.4891 ｄ25＝0.6071 ｒ26＝97.8294 ｄ26＝1.2996 ｎ15＝1.84666 ν15＝23.78 ｒ27＝41.4667 ｄ27＝7.0261 ｎ16＝1.62280 ν16＝57.06 ｒ28＝-30.3024 ｄ28＝0.2564 ｒ29＝50.9312 ｄ29＝6.1001 ｎ17＝1.80610 ν17＝40.95 ｒ30＝312.7578 ｆ 40.1 50.0 59.9 Ｄ1 16.965 8.963 2.491 Ｄ2 1.497 10.800 18.152 Ｄ3 6.706 5.430 2.192 φ12w/φw ＝0.803 ，φ34w/φw ＝0.4819，β2w＝-0.9
557 ，β2T＝-1.493 β3wβ4w＝0.80469 ，β3Tβ4T＝20.6452 ，ｘ2/ｘ4 ＝
5.8460 実施例５ ｆ＝36.0〜101.6, F/4.6〜F/5.8, 2ω=61.9°〜24.0° ｒ1 ＝-72.1560 ｄ1 ＝1.2000 ｎ1 ＝1.80610 ν1 ＝40.95 ｒ2 ＝142.0500 ｄ2 ＝1.8600 ｒ3 ＝-161.6170 ｄ3 ＝3.1600 ｎ2 ＝1.84666 ν2 ＝23.78 ｒ4 ＝-52.7310 ｄ4 ＝3.1400 ｒ5 ＝-735.4740 ｄ5 ＝0.7800 ｎ3 ＝1.80610 ν3 ＝40.95 ｒ6 ＝40.8510 ｄ6 ＝0.1200 ｒ7 ＝37.7440 ｄ7 ＝2.2510 ｎ4 ＝1.84666 ν4 ＝23.78 ｒ8 ＝63.5960 ｄ8 ＝0.8000 ｒ9 ＝54.3910 ｄ9 ＝0.8800 ｎ5 ＝1.51633 ν5 ＝64.15 ｒ10＝43.9360 ｄ10＝1.2500 ｎ6 ＝1.64769 ν6 ＝33.80 ｒ11＝36.5870 ｄ11＝Ｄ１（可変） ｒ12＝38.2360 ｄ12＝1.3200 ｎ7 ＝1.83400 ν7 ＝37.16 ｒ13＝24.8900 ｄ13＝6.0000 ｎ8 ＝1.69680 ν8 ＝55.52 ｒ14＝-76.7960 ｄ14＝0.9000 ｎ9 ＝1.84666 ν9 ＝23.78 ｒ15＝-1067.7000 ｄ15＝0.1500 ｒ16＝60.2260 ｄ16＝2.3900 ｎ10＝1.65830 ν10＝57.33 ｒ17＝-268.5660 ｄ17＝0.3000 ｒ18＝27.8640 ｄ18＝2.8900 ｎ11＝1.49700 ν11＝81.61 ｒ19＝56.3070 ｄ19＝Ｄ２（可変） ｒ20＝∞（絞り） ｄ20＝1.5840 ｒ21＝-55.9820 ｄ21＝1.0600 ｎ12＝1.51821 ν12＝65.04 ｒ22＝-108.3330 ｄ22＝4.2690 ｒ23＝28.9520 ｄ23＝0.7800 ｎ13＝1.50378 ν13＝66.81 ｒ24＝12.6150 ｄ24＝2.0000 ｎ14＝1.56883 ν14＝56.34 ｒ25＝14.1830 ｄ25＝Ｄ３（可変） ｒ26＝-28.0240 ｄ26＝1.6230 ｎ15＝1.50378 ν15＝66.81 ｒ27＝-18.3400 ｄ27＝0.1500 ｒ28＝-31.5140 ｄ28＝4.1950 ｎ16＝1.52310 ν16＝50.84 ｒ29＝-10.7388 ｄ29＝0.1000 ｒ30＝-10.6600 ｄ30＝0.8000 ｎ17＝1.83400 ν17＝37.16 ｒ31＝-26.1720 ｄ31＝Ｄ４（可変） ｒ32＝-22.8800 ｄ32＝2.4780 ｎ18＝1.78470 ν18＝26.22 ｒ33＝-19.0510 ｆ 36.0 65.7 101.6 Ｄ1 36.000 14.810 1.850 Ｄ2 2.600 7.560 18.810 Ｄ3 3.180 7.860 3.070 Ｄ4 1.700 13.370 19.670 φ12w/φw ＝1.80，φ34w/φw ＝-0.900，β2w＝-0.47
5，β2T＝-1.143 β3wβ4w＝2.55662 ，β3Tβ4T＝2.9938，ｘ2/ｘ4 ＝1.
897 実施例６ ｆ＝35.9〜101.9, F/4.6〜F/5.8, 2ω=68.5°〜24.0° ｒ1 ＝1541.6370 ｄ1 ＝1.1700 ｎ1 ＝1.80440 ν1 ＝39.58 ｒ2 ＝46.0860 ｄ2 ＝0.1400 ｒ3 ＝48.1200 ｄ3 ＝2.2700 ｎ2 ＝1.84666 ν2 ＝23.78 ｒ4 ＝78.3300 ｄ4 ＝Ｄ１（可変） ｒ5 ＝-1570.2640 ｄ5 ＝0.9700 ｎ3 ＝1.77250 ν3 ＝49.66 ｒ6 ＝45.6510 ｄ6 ＝0.1760 ｒ7 ＝44.0710 ｄ7 ＝2.3000 ｎ4 ＝1.84666 ν4 ＝23.78 ｒ8 ＝74.4700 ｄ8 ＝0.8500 ｒ9 ＝54.6500 ｄ9 ＝0.8900 ｎ5 ＝1.50378 ν5 ＝66.81 ｒ10＝35.4040 ｄ10＝1.3100 ｎ6 ＝1.66446 ν6 ＝35.81 ｒ11＝38.8660 ｄ11＝Ｄ２（可変） ｒ12＝57.0740 ｄ12＝0.8500 ｎ7 ＝1.83400 ν7 ＝37.16 ｒ13＝38.5700 ｄ13＝4.9950 ｎ8 ＝1.65830 ν8 ＝57.33 ｒ14＝-40.7890 ｄ14＝0.8940 ｎ9 ＝1.84666 ν9 ＝23.78 ｒ15＝-92.3040 ｄ15＝0.1440 ｒ16＝50.1200 ｄ16＝2.0000 ｎ10＝1.48749 ν10＝70.20 ｒ17＝181.1400 ｄ17＝0.1460 ｒ18＝33.3410 ｄ18＝3.1750 ｎ11＝1.48749 ν11＝70.20 ｒ19＝-325.1830 ｄ19＝Ｄ３（可変） ｒ20＝∞（絞り） ｄ20＝3.5520 ｒ21＝-12.8820 ｄ21＝1.1100 ｎ12＝1.59270 ν12＝35.29 ｒ22＝-13.1830 ｄ22＝2.3870 ｒ23＝-418.8670 ｄ23＝1.0000 ｎ13＝1.74100 ν13＝52.68 ｒ24＝13.9560 ｄ24＝2.9600 ｎ14＝1.84666 ν14＝23.78 ｒ25＝19.7000 ｄ25＝Ｄ４（可変） ｒ26＝147.7420 ｄ26＝1.4440 ｎ15＝1.83400 ν15＝37.16 ｒ27＝-123.2220 ｄ27＝0.2000 ｒ28＝-68.8970 ｄ28＝4.1100 ｎ16＝1.49700 ν16＝81.61 ｒ29＝-11.3250 ｄ29＝0.7950 ｎ17＝1.66680 ν17＝33.04 ｒ30＝-30.0310 ｄ30＝Ｄ５（可変） ｒ31＝-30.7810 ｄ31＝2.6800 ｎ18＝1.76200 ν18＝40.10 ｒ32＝-22.7690 ｆ 35.9 62.2 101.9 Ｄ1 3.930 6.600 2.910 Ｄ2 33.960 12.480 1.500 Ｄ3 5.140 12.140 22.580 Ｄ4 4.860 5.600 1.100 Ｄ5 2.200 13.290 22.010 φ12w/φw ＝1.724 ，φ34w/φw ＝-0.754，β2w＝-0.5
00，β2T＝-1.217 β3wβ4w＝2.63920 ，β3Tβ4T＝3.05895 ，ｘ2/ｘ4 ＝
1.6919 実施例７ ｆ＝31.7〜101.4, F/4.6〜F/5.8, 2ω=62.1°〜23.9° ｒ1 ＝-134.5080 ｄ1 ＝0.9740 ｎ1 ＝1.80610 ν1 ＝40.95 ｒ2 ＝86.1340 ｄ2 ＝2.0750 ｒ3 ＝1812.5700 ｄ3 ＝3.4380 ｎ2 ＝1.84666 ν2 ＝23.78 ｒ4 ＝-82.1858 ｄ4 ＝2.7910 ｒ5 ＝-2626.6621 ｄ5 ＝0.9109 ｎ3 ＝1.80610 ν3 ＝40.95 ｒ6 ＝37.5270 ｄ6 ＝0.1566 ｒ7 ＝33.7558 ｄ7 ＝2.3717 ｎ4 ＝1.84666 ν4 ＝23.78 ｒ8 ＝51.2964 ｄ8 ＝0.9124 ｒ9 ＝87.6457 ｄ9 ＝0.9559 ｎ5 ＝1.51633 ν5 ＝64.15 ｒ10＝33.6919 ｄ10＝1.5749 ｎ6 ＝1.64769 ν6 ＝33.80 ｒ11＝36.0551 ｄ11＝Ｄ１（可変） ｒ12＝35.5343 ｄ12＝1.8704 ｎ7 ＝1.83400 ν7 ＝37.16 ｒ13＝21.8849 ｄ13＝6.3337 ｎ8 ＝1.69680 ν8 ＝55.52 ｒ14＝-72.4562 ｄ14＝0.7333 ｎ9 ＝1.84666 ν9 ＝23.78 ｒ15＝-619.0383 ｄ15＝0.0680 ｒ16＝101.8110 ｄ16＝2.4937 ｎ10＝1.65830 ν10＝57.33 ｒ17＝-112.8304 ｄ17＝0.5208 ｒ18＝24.4640 ｄ18＝2.9234 ｎ11＝1.49700 ν11＝81.61 ｒ19＝76.6686 ｄ19＝Ｄ２（可変） ｒ20＝∞（絞り） ｄ20＝1.5908 ｒ21＝-62.8420 ｄ21＝1.1030 ｎ12＝1.51821 ν12＝65.04 ｒ22＝194.9900 ｄ22＝4.3650 ｒ23＝33.6980 ｄ23＝0.6500 ｎ13＝1.50378 ν13＝66.81 ｒ24＝13.4970 ｄ24＝1.8870 ｎ14＝1.56883 ν14＝56.34 ｒ25＝14.4940 ｄ25＝Ｄ３（可変） ｒ26＝-37.6700 ｄ26＝1.8020 ｎ15＝1.50378 ν15＝66.81 ｒ27＝-19.5170 ｄ27＝0.0133 ｒ28＝-27.7950 ｄ28＝3.6130 ｎ16＝1.51742 ν16＝52.41 ｒ29＝-10.6760 ｄ29＝0.5380 ｎ17＝1.83400 ν17＝37.16 ｒ30＝-23.1830 ｄ30＝Ｄ４（可変） ｒ31＝-24.3230 ｄ31＝2.5970 ｎ18＝1.78470 ν18＝26.22 ｒ32＝-19.7000 ｆ 31.7 61.6 101.4 Ｄ1 37.380 14.847 1.700 Ｄ2 2.346 7.769 18.800 Ｄ3 3.182 7.790 3.210 Ｄ4 0.709 13.147 19.904 φ12w/φw =1.967 ,φ34w/φw =-0.9201 ,β2w=-0.439,
β2T=-1.1766 β3wβ4w=2.86320 ,β3Tβ4T=3.41543 x2/x4 =1.8572 実施例８ f=36.2〜131.0 , F/4.6 〜F/5.8, 2ω=60.3°〜35.12
° r1 =-223.0764(非球面) d1 =1.8500 n1 =1.76182 ν1 =26.55 r2 =-93.5144 d2 =0.1200 r3 =-116.7127 d3 =0.8500 n2 =1.81554 ν2 =44.36 r4 =28.7056 d4 =0.1200 r5 =27.6554 d5 =4.8500 n3 =1.84666 ν3 =23.88 r6 =75.2765 d6 =0.8340 r7 =94.2680 d7 =2.0000 n4 =1.48749 ν4 =70.20 r8 =-325.4895 d8 =0.8000 n5 =1.69680 ν5 =55.52 r9 =37.8726 d9 =D1(可変) r10=38.7791(非球面) d10=1.0000 n6 =1.85026 ν6 =32.28 r11=19.8769 d11=6.2000 n7 =1.69680 ν7 =55.52 r12=-74.0633 d12=0.5500 n8 =1.84666 ν8 =23.88 r13=-358.8865 d13=0.1200 r14=37.0599 d14=3.5000 n9 =1.49700 ν9 =81.61 r15=-226.1367 d15=0.1200 r16=35.5491 d16=3.0000 n10=1.49700 ν10=81.61 r17=153.6430( 非球面) d17=D2(可変) r18=∞(絞リ) d18=2.0000 r19=341.9337 d19=1.9100 n11=1.53358 ν11=51.56 r20=20.0111 d20=3.7582 r21=-20.8036 d21=0.6500 n12=1.51821 ν12=65.04 r22=21.9088 d22=2.1500 n13=1.72825 ν13=28.46 r23=-298.0561 d23=D3(可変) r24=-167.0599 d24=2.5000 n14=1.53113 ν14=62.44 r25=-35.3445 d25=0.1000 r26=-435.8022 d26=5.8500 n15=1.48749 ν15=70.20 r27=-14.4781 d27=0.1200 r28=-14.4036 d28=0.8500 n16=1.83400 ν16=37.16 r29=-28.0912 d29=D4(可変) r30=-250.4406 d30=2.2000 n17=1.57135 ν17=52.92 r31=-132.5105 非球面係数 (第1面) P=1.0000, E=0.40108 ×10-6, F=-0.1726
0×10-8 G=0.22527 ×10-11, H=-0.19554×10-14 (第10面) P=1.0000, E=0.80578 ×10-6, F=0.38063
×10-8 G=-0.12553×10-10, H=0.26607×10-3 (第17面) P=1.0000, E=0.18796 ×10-5, F=0.16898
×10-8 G=-0.30787×10-10, H=0.97607×10-13 f 36.2 66.2 131.0 D1 39.258 17.095 0.650 D2 4.907 7.939 23.965 D3 10.682 6.011 0.500 D4 0.650 24.457 30.395 ただしｒ1 ，ｒ2 ，・・・ はレンズ各面の曲率半径、ｄ1
，ｄ2 ，・・・ は各レンズの肉厚およびレンズ間隔、ｎ1
，ｎ2 ，・・・ は各レンズの屈折率、ν1 ，ν2 ，・・・
は各レンズのアッベ数である。EXAMPLES Next, examples of the zoom lens of the present invention will be shown. Example 1 f = 21.7 to 49.1, F / 4.5 to F / 5.8, 2ω = 89.7 ° to 47.5 ° r1 = 170.9797 d1 = 1.1000 n1 = 1.83481 ν1 = 42.72 r2 = 26.4545 (aspherical surface) d2 = 4.3702 r3 = 137.3708 d3 = 3.2516 n2 = 1.84666 ν2 ＝ 23.78 r4 ＝ -216.0576 d4 ＝ 0.1200 r5 ＝ -375.6913 d5 = 1.1000 n3 ＝ 1.69680 ν3 ＝ 55.52 r6 ＝ 20.8564 (aspherical surface) d6 ＝ 3.0928 r7 ＝ 42.71 r8 = 24.5952 d8 = 0.1500 r9 = 25.0765 d9 = 6.4614 n5 = 1.64769 ν5 = 33.80 r10 = 4915.9863 d10 = D1 (variable) r11 = 68.2574 d11 = 1.4583 n6 = 1.80400 ν6 = 460.157 d12 = 110.16 3.6724 n7 = 1.84666 ν7 ＝ 23.88 r14 ＝ 23.5782 d14 ＝ 3.3820 n8 ＝ 1.69680 ν8 ＝ 56.49 r15 ＝ 250.1688 d15 ＝ 0.1000 r16 ＝ 24.6446 d16 ＝ 3.9206 n9 ＝ 1.61700 ν9 ＝ 62.79 r17 ＝ 103.4564 (Aperture) d18 = 1.0000 r19 = -228.5059 d19 = 1.6067 n10 1.84666 ν10 = 23.88 r20 = -29.6935 d20 = 1.3807 n11 = 1.50378 ν11 = 66.81 r21 = -20.6660 d21 = 0.2447 r22 = -18.8590 d22 = 1.1000 n12 = 1.74320 ν12 = 49.31 r23 = 26.0834 d23 = D3-18 (variable) 876 d24 = 3.1619 n13 = 1.60300 ν13 = 65.48 r25 = -23.5483 d25 = 0.1000 r26 = 1970.0412 d26 = 5.2686 n14 = 1.49700 ν14 = 81.61 r27 = -16.9041 d27 = 0.1670 r28 = -16.8370 d28 = 1.1000 ν15 = 1.83. -51.9298 d29 = D4 (variable) r30 = -92.3954 d30 = 3.2285 n16 = 1.61700 ν16 = 62.79 r31 = -38.2959 Aspheric surface coefficient (2nd surface) P = 1.0000, E = -0.17510 × 10 -4 , F = -0.1
3193 x 10 -7 G = 0.56055 x 10 -10 , H = -0.77772 x 10 -13 (6th surface) P = 1.0000, E = 0.81144 x 10 -5 , F = -0.2
2960 × 10 -9 G = -0.12606 × 10 -9 , H = 0.91554 × 10 -13 f 21.7 32.8 49.1 D1 24.295 10.044 1.553 D2 1.700 5.823 12.218 D3 9.348 9.115 2.870 D4 0.880 11.241 19.580 φ12w / φw = 1.261, φ34w / φw = -0.1957, β2w ＝-
0.5723, β2T = -1.1200 β3w β4w = 1.94446, β3T β4T = 4.0916, x2 / x4 = 1.
216 Example 2 f = 24.3 to 77.7, F / 4.6 to F / 5.8, 2ω = 83.3 ° to 31.1 ° r1 = 107.2744 d1 = 1.0000 n1 = 1.83400 ν1 = 37.16 r2 = 33.0005 d2 = 6.0916 r3 = 391.8495 d3 = 4.0680 n2 = 1.68893 ν2 = 31.08 r4 = -78.8483 d4 = 0.1200 r5 = 328.1877 d5 = 1.0000 n3 = 1.83481 ν3 = 42.72 r6 = 39.0346 d6 = 2.4526 r7 = 8195 847 = 8195 847 1.84666 ν5 = 23.78 r9 = 32.4661 d9 = D1 (variable) r10 = 40.1886 d10 = 2.3684 n6 = 1.49700 ν6 = 81.61 r11 = 71.8883 d11 = 0.1200 r12 = 42.8479 δ8 = 13.864.58 7 = 1.69680 ν8 = 55.52 r14 = -188.0267 d14 = 0.1200 r15 = 24.9476 d15 = 3.2335 n9 = 1.69680 ν9 = 55.52 r16 = 2564.0158 d16 = D2 (variable) r17 = ∞ (diaphragm) d17 = 0.6147 r18 = -147.5174 n10 = 1.8 = 1.84666 ν10 = 23.88 r19 = -18.8152 d19 = 1.0000 n11 1.83481 ν11 = 42.72 r20 = 77.2279 d20 = 0.5264 r21 = -68.8248 d21 = 1.0000 n12 = 1.69680 ν12 = 55.52 r22 = 27.0982 d22 = D3 (variable) r23 = 752.3348 d23 = 3.7442 r13 = 1.56907 ν13 = 21.98 r24 0.1200 r25 = 55.3467 d25 = 5.2307 n14 = 1.49700 ν14 = 81.61 r26 = -19.2854 d26 = 1.0000 n15 = 1.83400 ν15 = 37.16 r27 = -378.8459 d27 = D4 (variable) r28 = 1657.0512 d28 = 2.7117 n16 = 1.83481 ν16 -97.0075 f 24.3 43.6 77.7 D1 30.533 12.899 2.000 D2 2.000 5.433 12.592 D3 10.768 7.588 1.344 D4 1.150 18.531 28.514 φ12w / φw = 1.800, φ34w / φw = -0.4140, β2w =-
0.4388, β2T = -1.0160 β3w β4w = 2.8178, β3Tβ4T = 3.2700, x2 / x4 = 1.04
1 Example 3 f = 40.2 to 59.8, F / 2.2 to F / 2.1, 2ω = 56.6 ° to 39.7 ° r1 = 4687.3004 d1 = 1.0659 n1 = 1.83400 ν1 = 37.16 r2 = 45.8358 d2 = 3.8079 r3 = 229.7202 d3 = 1.6132 n2 = 1.59551 ν2 ＝ 39.21 r4 ＝ 83.4386 d4 ＝ 0.5371 r5 ＝ 52.4821 d5 ＝ 4.6611 n3 ＝ 1.84666 ν3 ＝ 23.78 r6 ＝ 501.6307 d6 ＝ 2.9855 r7 ＝ -74.9661 d7 ＝ 1.1233 ν3 ＝ 74.96 n5 ＝ 4. 1.74000 ν5 = 28.29 r9 = 165.9146 d9 = D1 (variable) r10 = 141.5455 d10 = 5.1678 n6 = 1.80610 ν6 = 40.95 r11 = -73.4960 d11 = 0.6914 r12 = 65.2771 d12 = 1.5768 n7 = 1.813400168078 = 7768 n8 = 1.69680 ν8 = 55.52 r14 = -43.8874 d14 = 1.7200 n9 = 1.84666 ν9 = 23.78 r15 = -615.6574 d1 = D2 (variable) r16 = ∞ (diaphragm) d16 = 4.1118 r17 = 93.4452 d17 = 2.4287 n10 = 1.80518 r18 = 47.9971 d18 = 1.4966 r19 = 30.8331 d19 = 3.4154 n11 = 1.53172 ν11 = 48.90 r20 = 99.3872 d20 = 2.4598 r21 = -39.9044 d21 = 1.4714 n12 = 1.60311 ν12 = 60.70 r22 = 23.8495 d22 = 3.3323 n13 = 1.84666 ν13 = 23.78 r23 = 54.7600 d23 = D3 = 24 (variable) (variable) 1.3122 n14 = 1.80518 ν14 = 25.43 r25 = 54.6188 d25 = 0.5381 r26 = 96.7077 d26 = 1.2188 n15 = 1.84666 ν15 = 23.78 r27 = 44.4318 d27 = 6.9330 n16 = 1.62280 ν16 = 57.06 r28 = -30.7540 d29 = 6,0630 n17 = 1.80610 ν17 = 40.95 r30 = -2091.2177 f 40.2 50.1 59.8 D1 17.698 8.738 2.261 D2 2.031 10.660 17.707 D3 7.034 5.254 2.087 φ12w / φw = 0.7229, φ34w / φw = 0.482, β2w = -1.0
300, β2T = -1.675 β3w β4w = 0.7289, β3T β4T = 23.5560, x2 / x4 = 3.
Example 4 f = 40.1 to 59.9, F / 2.2 to F / 2.2, 2ω = 56.7 ° to 39.7 ° r1 = 7066.1589 d1 = 1.1762 n1 = 1.83400 ν1 = 37.16 r2 = 45.3679 d2 = 3.8512 r3 = 234.2121 d3 = 1.6140 n2 = 1.59551 ν2 ＝ 39.21 r4 ＝ 81.1349 d4 ＝ 0.4993 r5 ＝ 53.0793 d5 ＝ 4.6837 n3 ＝ 1.84666 ν3 ＝ 23.78 r6 ＝ 563.0834 d6 ＝ 2.4928 r7 ＝ -95.0232 d7 ＝ 1.162 n8 ＝ 4. 1.74000 ν5 = 28.29 r9 = 134.4132 d9 = D1 (variable) r10 = 105.7047 d10 = 5.2659 n6 = 1.80610 ν6 = 40.95 r11 = -82.9131 d11 = 0.7038 r12 = 57.6589 147 d12 = 1.5955 n7 = 1337400414 ν7 n8 = 1.69680 ν8 = 55.52 r14 = -48.9894 d14 = 1.8041 n9 = 1.84666 ν9 = 23.78 r15 = -3333.4457 d15 = D2 (variable) r16 = ∞ (diaphragm) d16 = 4.1772 r17 = 101.5239 d17 = 2.5241 n10 = 1.80518 r18 = 45.9697 d18 = 1.6219 r19 = 34.5520 d19 = 3.5052 n 11 = 1.53172 ν11 = 48.90 r20 = 124.3129 d20 = 2.4994 r21 = -38.4675 d21 = 1.5667 n12 = 1.60311 ν12 = 60.70 r22 = 23.5327 d22 = 3.4095 n13 = 1.84666 ν13 = 23.78 r23 = 61.0593 d23 = D3-50 (variable) 4.2 d24 = 1.3495 n14 = 1.80518 ν14 = 25.43 r25 = 53.4891 d25 = 0.6071 r26 = 97.8294 d26 = 1.2996 n15 = 1.84666 ν15 = 23.78 r27 = 41.4667 d27 = 7.0261 r16 = 1.62280 ν16 = 57.06 r28 = -30.40312 = 6.1001 n17 = 1.80610 ν17 = 40.95 r30 = 312.7578 f 40.1 50.0 59.9 D1 16.965 8.963 2.491 D2 1.497 10.800 18.152 D3 6.706 5.430 2.192 φ12w / φw = 0.803, φ34w / φw = 0.4819, β2w = -0.9
557, β2T = -1.493 β3w β4w = 0.80469, β3T β4T = 20.6452, x2 / x4 =
5.8460 Example 5 f = 36.0 to 101.6, F / 4.6 to F / 5.8, 2ω = 61.9 ° to 24.0 ° r1 = -72.1560 d1 = 1.2000 n1 = 1.80610 ν1 = 40.95 r2 = 142.0500 d2 = 1.8600 r3 = -161.6170 d3 = 3.1600 n2 = 1.84666 v2 = 23.78 r4 = -52.7310 d4 = 3.1400 r5 = -735.4740 d5 = 0.7800 n3 = 1.80610 v3 = 40.95 r6 = 40.8510 d6 = 0.1200 r7 = 37.7440 d7 = 1.88 4n = 4. 0.8000 r9 = 54.3910 d9 = 0.8800 n5 = 1.51633 ν5 = 64.15 r10 = 43.9360 d10 = 1.2500 n6 = 1.64769 ν6 = 33.80 r11 = 36.5870 d11 = D1 (variable) r12 = 38.2360 d12 = 1.3200 ν7 = 1.83 n7 = 1.83 ＝ 6.0000 n8 = 1.9680 ν8 ＝ 55.52 r14 ＝ -76.7960 d14 ＝ 0.9000 n9 ＝ 1.84666 ν9 ＝ 23.78 r15 ＝ -1067.7000 d15 ＝ 0.1500 r16 ＝ 60.2260 d16 ＝ 2.3900 n10 ＝ 1.65830 ν10 ＝ 57.33 ＝ 178.526 d18 = 2.8900 n11 = 1.49700 ν11 = 81.61 r19 = 56.3070 d19 D2 (variable) r20 = ∞ (aperture) d20 = 1.5840 r21 = -55.9820 d21 = 1.0600 n12 = 1.51821 ν12 = 65.04 r22 = -108.3330 d22 = 4.2690 r23 = 28.9520 d23 = 0.7800 n13 = 1.50378 ν13 = 66.81 r24 = 12.6150 d24 2.0000 n14 = 1.56883 ν14 = 56.34 r25 = 14.1830 d25 = D3 (variable) r26 = -28.0240 d26 = 1.6230 n15 = 1.50378 ν15 = 66.81 r27 = -18.3400 d27 = 0.1500 r28 = -31.5140 r28 = 4.1950 n16 = 1.52310 r29 = 50. = -10.7388 d29 = 0.1000 r30 = -10.6600 d30 = 0.8000 n17 = 1.83400 ν17 = 37.16 r31 = -26.1720 d31 = D4 (variable) r32 = -22.8800 d32 = 2.4780 n18 = 1.78470 ν18 = 26.22 r33 = -19.0510 f36.0 65.7 101.6 D1 36.000 14.810 1.850 D2 2.600 7.560 18.810 D3 3.180 7.860 3.070 D4 1.700 13.370 19.670 φ12w / φw = 1.80, φ34w / φw = -0.900, β2w = -0.47
5, β2T = -1.143 β3w β4w = 2.55662, β3Tβ4T = 2.9938, x2 / x4 = 1.
897 Example 6 f = 35.9 to 101.9, F / 4.6 to F / 5.8, 2ω = 68.5 ° to 24.0 ° r1 = 1541.6370 d1 = 1.1700 n1 = 1.80440 ν1 = 39.58 r2 = 46.0860 d2 = 0.1400 r3 = 48.1200 d3 = 2.2700 n2 = 1.84666 ν2 = 23.78 r4 = 78.3300 d4 = D1 (variable) r5 = -1570.2640 d5 = 0.9700 n3 = 1.77250 ν3 = 49.66 r6 = 45.6510 d6 = 0.1760 r7 = 44.0710 d7 = 7 4,0008.2.34 n8 = 2.3000 n4 0.8500 r9 = 54.6500 d9 = 0.8900 n5 = 1.50378 ν5 = 66.81 r10 = 35.4040 d10 = 1.3100 n6 = 1.66446 ν6 = 35.81 r11 = 38.8660 d11 = D2 (variable) r12 = 57.0740 d12 = 0.83700 ν7 = 1.8500 n7 = 1.8500 n7 = 1.83 = 4.9950 n8 = 1.65830 ν8 = 57.33 r14 = -40.7890 d14 = 0.8940 n9 = 1.84666 ν9 = 23.78 r15 = -92.3040 d15 = 0.1440 r16 = 50.1200 d16 = 2.0000 n10 = 1.48749 ν10 = 70.20 r17 = 180.1400 = 3.1750 n11 = 1.48749 ν11 = 70.20 r19 = -325.1830 19 = D3 (variable) r20 = ∞ (aperture) d20 = 3.5520 r21 = -12.8820 d21 = 1.1100 n12 = 1.59270 ν12 = 35.29 r22 = -13.1830 d22 = 2.3870 r23 = -418.8670 d23 = 1.0000 n13 = 1.74100 ν13 = 52.68 r24 = 13.9560 d24 = 2.9600 n14 = 1.84666 ν14 = 23.78 r25 = 19.7000 d25 = D4 (variable) r26 = 147.7420 d26 = 1.4440 n15 = 1.83400 ν15 = 37.16 r27 = -123.2220 d27 = 0.2000 r28 = -68.8970 d28 = 4.1100 n16 = 16100 81.61 r29 = -11.3250 d29 = 0.7950 n17 = 1.66680 ν17 = 33.04 r30 = -30.0310 d30 = D5 (variable) r31 = -30.7810 d31 = 2.6800 n18 = 1.76200 ν18 = 40.10 r32 = -22.7690 f35.9 62.2 101.9 D1 3.930 6.600 2.910 33.960 12.480 1.500 D3 5.140 12.140 22.580 D4 4.860 5.600 1.100 D5 2.200 13.290 22.010 φ12w / φw = 1.724, φ34w / φw = -0.754, β2w = -0.5
00, β2T = -1.217 β3w β4w = 2.63920, β3T β4T = 3.05895, x2 / x4 =
1.6919 Example 7 f = 31.7 to 101.4, F / 4.6 to F / 5.8, 2ω = 62.1 ° to 23.9 ° r1 = -134.5080 d1 = 0.9740 n1 = 1.80610 ν1 = 40.95 r2 = 86.1340 d2 = 2.0750 r3 = 1812.5700 d3 = 3.4380 n2 = 1.84666 ν2 = 23.78 r4 = -82.1858 d4 = 2.7910 r5 = -2626.6621 d5 = 0.9109 n3 = 1.80610 ν3 = 40.95 r6 = 37.5270 d6 = 0.1566 r7 = 33.7558 d7 = 8 816 = 8 73623 n4 r9 = 87.6457 d9 = 0.9559 n5 = 1.51633 ν5 = 64.15 r10 = 33.6919 d10 = 1.5749 n6 = 1.64769 ν6 = 33.80 r11 = 36.0551 d11 = D1 (variable) r12 = 3705343 d12 = 1.8704 n13 = 1.83 4008 n7 = 1.83 6.3337 n8 = 1.9680 ν8 ＝ 55.52 r14 ＝ -72.4562 d14 ＝ 0.7333 n9 ＝ 1.84666 ν9 ＝ 23.78 r15 ＝ -619.0383 d15 ＝ 0.0680 r16 ＝ 101.8110 d16 ＝ 2.4937 n10 ＝ 1.65830 ν10 ＝ 57.33 r18 ＝ -112.8304 d17 ＝ 112.8304 d17 = 2.9234 n11 = 1.49700 ν11 = 81.61 r19 = 76.6686 d19 D2 (variable) r20 = ∞ (aperture) d20 = 1.5908 r21 = -62.8420 d21 = 1.1030 n12 = 1.51821 ν12 = 65.04 r22 = 194.9900 d22 = 4.3650 r23 = 33.6980 d23 = 0.6500 n13 = 1.50378 ν13 = 66.81 r24 = 11.8970 d24 n14 = 1.56883 ν14 = 56.34 r25 = 14.4940 d25 = D3 (variable) r26 = -37.6700 d26 = 1.8020 n15 = 1.50378 ν15 = 66.81 r27 = -19.5170 d27 = 0.0133 r28 = -27.7950 d28 = 3.6130 n16 = 1.51742 ν16 = 52.41 -10.6760 d29 = 0.5380 n17 = 1.83400 ν17 = 37.16 r30 = -23.1830 d30 = D4 (variable) r31 = -24.3230 d31 = 2.5970 n18 = 1.78470 ν18 = 26.22 r32 = -19.7000 f 31.7 61.6 101.4 D1 37.380 14.847 1.700 18.800 D2 2.346 D3 3.182 7.790 3.210 D4 0.709 13.147 19.904 φ12w / φw = 1.967, φ34w / φw = -0.9201, β2w = -0.439,
β2T = -1.1766 β3w β4w = 2.86320, β3T β4T = 3.41543 x2 / x4 = 1.8572 Example 8 f = 36.2 to 131.0, F / 4.6 to F / 5.8, 2ω = 60.3 ° to 35.12
° r1 = -223.0764 (aspherical surface) d1 = 1.8500 n1 = 1.76182 ν1 = 26.55 r2 = -93.5144 d2 = 0.1200 r3 = -116.7127 d3 = 0.8500 n2 = 1.81554 ν2 = 44.36 r4 = 28.7056 d4 = 0.1200 r5 = 27.6554 d5 = 4.8500 n3 = 1.84666 ν3 = 23.88 r6 = 75.2765 d6 = 0.8340 r7 = 94.2680 d7 = 2.0000 n4 = 1.48749 ν4 = 70.20 r8 = -325.4895 d8 = 0.8000 n5 = 1.69680 ν5 = 55.52 r9 = 37.8726 d9 = D1 (variable) r10 = 38.7791 ( Aspheric surface) d10 = 1.0000 n6 = 1.85026 ν6 = 32.28 r11 = 19.8769 d11 = 6.2000 n7 = 1.69680 ν7 = 55.52 r12 = -74.0633 d12 = 0.5500 n8 = 1.84666 ν8 = 23.88 r13 = -358.8865 d13 = 0.1200 r14 = 37.0599 d14 = 3.5000 n9 = 1.49700 ν9 = 81.61 r15 = -226.1367 d15 = 0.1200 r16 = 35.5491 d16 = 3.0000 n10 = 1.49700 ν10 = 81.61 r17 = 153.6430 (aspherical surface) d17 = D2 (variable) r18 = ∞ (aperture) d18 = 2.0000 r19 = 341.9337 d19 = 1.9100 n11 = 1.53358 ν11 = 51.56 r20 = 20.0111 d20 = 3.7582 r21 = -20.8036 d21 = 0.6500 n12 = 1.51821 ν12 = 65.04 r22 = 21.9088 d22 = 2.1500 n13 = 1.72825 ν13 = 28.46 r23 = -298.0561 d23 = D3 (variable ) r24 = -167.0599 d24 = 2.5000 n14 = 1.53113 ν14 = 62.44 r25 = -35.3445 d25 = 0.1000 r26 = -435.8022 d26 = 5.8500 n15 = 1 .48749 ν15 = 70.20 r27 = -14.4781 d27 = 0.1200 r28 = -14.4036 d28 = 0.8500 n16 = 1.83400 ν16 = 37.16 r29 = -28.0912 d29 = D4 (variable) r30 = -250.4406 d30 = 2.2000 n17 = 1.57135 ν17 = 52.92 r31 = -132.5105 Aspherical coefficient (first surface) P = 1.0000, E = 0.40108 × 10 -6 , F = -0.1726
0 × 10 -8 G = 0.22527 × 10 -11 , H = -0.19554 × 10 -14 (10th surface) P = 1.0000, E = 0.80578 × 10 -6 , F = 0.38063
× 10 -8 G = -0.12553 × 10 -10 , H = 0.26607 × 10 -3 (17th surface) P = 1.0000, E = 0.18796 × 10 -5 , F = 0.16898
× 10 -8 G = -0.30787 × 10 -10 , H = 0.97607 × 10 -13 f 36.2 66.2 131.0 D1 39.258 17.095 0.650 D2 4.907 7.939 23.965 D3 10.682 6.011 0.500 D4 0.650 24.457 30.395 where r1, r2, ... are lenses Radius of curvature of each surface, d1
, D2, ... Are the wall thickness and lens spacing of each lens, n1
, N2, ..., Refractive index of each lens, ν1, ν2 ,.
Is the Abbe number of each lens.

【００４２】実施例１および実施例２は夫々図１および
図２に示す構成で、両実施例とも第１レンズ群と第５レ
ンズ群が像面に対して固定されており、第２レンズ群，
第３レンズ群，第４レンズ群が可動である。Example 1 and Example 2 have the configurations shown in FIGS. 1 and 2, respectively. In both Examples, the first lens group and the fifth lens group are fixed to the image plane, and the second lens group. ，
The third lens group and the fourth lens group are movable.

【００４３】実施例１は、焦点距離が２１．７〜４９．
１で、第１レンズ群に非球面を用いて広角に特有の歪曲
収差の補正を主として行なっている。これにより他の収
差の自由度が増す。In the first embodiment, the focal length is 21.7 to 49.
In No. 1, the aspherical surface is used for the first lens group to mainly correct the distortion aberration peculiar to the wide angle. This increases the degree of freedom of other aberrations.

【００４４】実施例２は、図２に示す構成で焦点距離が
２４．３〜７７．７の広角系ズームレンズで、倍率の色
収差、歪曲収差ともに良好に補正され、望遠側で球面収
差がやや大きいが、非球面により収差が良好に補正され
ている。The second embodiment is a wide-angle zoom lens having the configuration shown in FIG. 2 and a focal length of 24.3 to 77.7, in which chromatic aberration of magnification and distortion are satisfactorily corrected, and spherical aberration is slightly on the telephoto side. Although large, the aberration is satisfactorily corrected by the aspherical surface.

【００４５】実施例３および実施例４は、夫々図３およ
び図４に示す通りで、焦点距離は４０．２〜５９．８
で、ズーミング中固定の第５レンズ群が用いられていな
い４群構成である。又口径比が大きくＦ／２．１５程度
である。Embodiments 3 and 4 are as shown in FIGS. 3 and 4, respectively, and have focal lengths of 40.2 to 59.8.
Thus, the fifth lens group, which is fixed during zooming, is not used. Further, the aperture ratio is large and is about F / 2.15.

【００４６】実施例５〜７は、防水又は防滴機構を備え
たレンズ系を想定して設計した。すなわち第１レンズ群
と第５レンズ群をズーミング中固定にして第２レンズ群
〜第４レンズ群を変倍のため移動する。Examples 5 to 7 were designed by assuming a lens system provided with a waterproof or drip-proof mechanism. That is, the first lens group and the fifth lens group are fixed during zooming, and the second lens group to the fourth lens group are moved for zooming.

【００４７】実施例５は、図５に示す構成で、焦点距離
が３６〜１０１．６のズームレンズである。The fifth embodiment has a configuration shown in FIG. 5 and is a zoom lens having a focal length of 36 to 101.6.

【００４８】実施例６は、図６に示す構成で焦点距離３
５．９〜１０１．９１のズームレンズであり、実施例５
と類似の構成である。しかしこの実施例では、第１レン
ズ群を前群と後群とで構成し、そのうちの後群をズーミ
ング中可動にした。この実施例は、球面収差の色収差が
残存するが、この点を除けば諸収差がバランス良く補正
されている。Example 6 has a focal length of 3 with the configuration shown in FIG.
Example 5 is a zoom lens of 5.9 to 101.91.
The configuration is similar to. However, in this embodiment, the first lens group is composed of a front group and a rear group, and the rear group of them is movable during zooming. In this embodiment, chromatic aberration of spherical aberration remains, but various aberrations are corrected in good balance except this point.

【００４９】実施例７は、第７図に示す構成で、焦点距
離は３１．７〜１０１．４である。The seventh embodiment has the structure shown in FIG. 7 and has a focal length of 31.7 to 101.4.

【００５０】実施例８は、焦点距離が３６〜１３１で、
高変倍率で広角系のズームレンズである。この実施例で
は、フォーカシング時に第１レンズ群〜第４レンズ群を
移動している。このように第１レンズ群以外でのフォー
カシングも、既に述べたように基本的に球面収差と非点
収差の変動が小さいか同一方向であれば実用化が可能で
ある。The eighth embodiment has a focal length of 36 to 131,
It is a wide-angle zoom lens with high magnification. In this embodiment, the first to fourth lens groups are moved during focusing. As described above, focusing can be practically applied to the components other than the first lens unit, basically, as long as the spherical aberration and the astigmatism have a small variation or the same direction.

【００５１】上記実施例１乃至７の第２、第３、第４レ
ンズ群の移動量ｘ２、ｘ３、ｘ４は、下記の表の通りで
ある。The movement amounts x2, x3, and x4 of the second, third, and fourth lens groups of Examples 1 to 7 are shown in the table below.

【００５２】 表 ｘ２ ｘ３ ｘ４ 実施例１ 22.7474 12.2294 18.7074 ２ 29.6626 19.0706 28.4946 ３ 16.0318 0.3558 5.3028 ４ 16.6464 -2.0086 2.5054 ５ 34.0489 17.8339 17.9489 ６ 33.4522 16.0122 19.7722 ７ 35.7106 19.2566 19.2286 又実施例中の非球面形状は、光軸をｘ軸に、光軸と直角
な方向にｙ軸をとる時次の式で表わされる。 Table x2 x3 x4 Example 1 22.7474 12.2294 18.7074 2 29.6626 19.0706 28.4946 3 16.0318 0.3558 5.3028 4 16.6464 -2.0086 2.5054 5 34.0489 17.8339 17.9489 6 33.4522 16.0122 19.7722 7 35.7106 19.2566 19.2286 Also the aspherical shape in the example is the aspherical shape. When x is the x-axis and y-axis is the direction perpendicular to the optical axis, it is expressed by the following equation.

【００５３】ただしｒは非球面の光軸近傍での曲率半
径、ｐは円錐定数、Ｅ，Ｆ，Ｇ，…は非球面係数であ
る。Here, r is a radius of curvature of the aspheric surface near the optical axis, p is a conic constant, and E, F, G, ... Are aspherical coefficients.

【００５４】[0054]

【発明の効果】本発明のズームレンズは、ズーミング巾
レンズ系の全長がほぼ一定であるので、密封構造が可能
であり、しかも広角系の使用に十分適応し得て変倍比が
比較的大きい光学系である。In the zoom lens of the present invention, since the entire length of the zooming width lens system is substantially constant, a hermetically sealed structure is possible, and furthermore, it can be sufficiently adapted to the use of a wide angle system and the zoom ratio is relatively large. It is an optical system.

【図面の簡単な説明】[Brief description of drawings]

【図１】実施例１の断面図FIG. 1 is a sectional view of a first embodiment.

【図２】実施例２の断面図FIG. 2 is a sectional view of a second embodiment.

【図３】実施例３の断面図FIG. 3 is a sectional view of a third embodiment.

【図４】実施例４の断面図FIG. 4 is a sectional view of a fourth embodiment.

【図５】実施例５の断面図FIG. 5 is a sectional view of the fifth embodiment.

【図６】実施例６の断面図FIG. 6 is a sectional view of Example 6.

【図７】実施例７の断面図FIG. 7 is a sectional view of Example 7.

【図８】実施例８の断面図8 is a sectional view of Example 8. FIG.

【図９】実施例１の広角端における収差曲線図FIG. 9 is an aberration curve diagram of Example 1 at the wide-angle end.

【図１０】実施例１の中間焦点距離における収差曲線図FIG. 10 is an aberration curve diagram for Example 1 at an intermediate focal length.

【図１１】実施例１の望遠端における収差曲線図FIG. 11 is an aberration curve diagram for Example 1 at the telephoto end.

【図１２】実施例２の広角端における収差曲線図FIG. 12 is an aberration curve diagram for Example 2 at the wide-angle end.

【図１３】実施例２の中間焦点距離における収差曲線図FIG. 13 is an aberration curve diagram for Example 2 at the intermediate focal length.

【図１４】実施例２の望遠端における収差曲線図FIG. 14 is an aberration curve diagram of Example 2 at the telephoto end.

【図１５】実施例３の広角端における収差曲線図15 is an aberration curve diagram for Example 3 at the wide-angle end. FIG.

【図１６】実施例３の中間焦点距離における収差曲線図FIG. 16 is an aberration curve diagram for Example 3 at the intermediate focal length.

【図１７】実施例３の望遠端における収差曲線図FIG. 17 is an aberration curve diagram for Example 3 at the telephoto end.

【図１８】実施例４の広角端における収差曲線図FIG. 18 is an aberration curve diagram of Example 4 at the wide-angle end.

【図１９】実施例４の中間焦点距離における収差曲線図FIG. 19 is an aberration curve diagram for Example 4 at the intermediate focal length.

【図２０】実施例４の望遠端における収差曲線図20 is an aberration curve diagram for Example 4 at the telephoto end. FIG.

【図２１】実施例５の広角端における収差曲線図FIG. 21 is an aberration curve diagram for Example 5 at the wide-angle end.

【図２２】実施例５の中間焦点距離における収差曲線図FIG. 22 is an aberration curve diagram for Example 5 at the intermediate focal length.

【図２３】実施例５の望遠端における収差曲線図23 is an aberration curve diagram for Example 5 at the telephoto end. FIG.

【図２４】実施例６の広角端における収差曲線図FIG. 24 is an aberration curve diagram for Example 6 at the wide-angle end.

【図２５】実施例６の中間焦点距離における収差曲線図FIG. 25 is an aberration curve diagram for Example 6 at the intermediate focal length.

【図２６】実施例６の望遠端における収差曲線図FIG. 26 is an aberration curve diagram for Example 6 at the telephoto end.

【図２７】実施例７の広角端における収差曲線図FIG. 27 is an aberration curve diagram for Example 7 at the wide-angle end.

【図２８】実施例７の中間焦点距離における収差曲線図FIG. 28 is an aberration curve diagram for Example 7 at the intermediate focal length.

【図２９】実施例７の望遠端における収差曲線図29 is an aberration curve diagram for Example 7 at the telephoto end. FIG.

【図３０】実施例８の広角端における収差曲線図FIG. 30 is an aberration curve diagram for Example 8 at the wide-angle end.

【図３１】実施例９の広角端における収差曲線図FIG. 31 is an aberration curve diagram for Example 9 at the wide-angle end.

【図３２】実施例１０の広角端における収差曲線図FIG. 32 is an aberration curve diagram for Example 10 at the wide-angle end.

【図３３】本発明のズーミングジ時のレンズ群の移動を
示す図FIG. 33 is a diagram showing the movement of lens groups during zooming according to the present invention.

【図３４】本発明のズーミングジ時のレンズ群の移動の
他の例を示す図FIG. 34 is a diagram showing another example of movement of the lens group during zooming according to the present invention.

【図３５】本発明のズーミングジ時のレンズ群の移動の
更に他の例を示す図FIG. 35 is a diagram showing still another example of movement of the lens group during zooming according to the present invention.

【図３６】本発明の第２、第３、第４レンズ群の移動の
関係を示す図FIG. 36 is a diagram showing the relationship of movement of the second, third, and fourth lens groups of the present invention.

【図３７】従来の負先行型２群ズームレンズの移動を示
す図FIG. 37 is a diagram showing movement of a conventional negative leading type second group zoom lens.

【図３８】従来の負先行型４群ズームレンズの移動を示
す図FIG. 38 is a diagram showing the movement of a conventional negative-leading type four-group zoom lens.

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成４年９月３日[Submission date] September 3, 1992

【手続補正１】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００１０[Correction target item name] 0010

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【００１０】その理由として、図３３のようなズーム比
が２以下の、いわゆる標準ズームレンズは、ほぼ負先行
の２群ズームレンズ又はそれに第３レンズ群としてフィ
ールドフラットナーを付加した２群ズームレンズの拡張
型である。更にズーム比が大になると、図３４のよう
に、２群ズームレンズをダブルズーム化した４群ズーム
レンズである。しかしこれらは、いずれもレンズ系の全
長が変化する。そこで広角域の画角を包括しながら、レ
ンズ系の第１面からフィルム面までがズーミング中ほぼ
一定で、レンズ鏡胴内での媒質（空気）の容積変化が小
さくてズーミング時の駆動トルクが問題にならないズー
ムレンズの開発が必要である。The reason for this is that a so-called standard zoom lens having a zoom ratio of 2 or less as shown in FIG. 33 is a substantially negative leading two-group zoom lens or a two-group zoom lens in which a field flattener is added as a third lens group. Is an extended type of. When the zoom ratio further increases, as shown in FIG. 34, the zoom lens is a fourth group zoom lens in which the second group zoom lens is double zoomed . However, in all of these, the total length of the lens system changes. Therefore, while covering the angle of view in a wide angle range, the first surface of the lens system to the film surface is almost constant during zooming, the volume change of the medium (air) in the lens barrel is small, and the driving torque during zooming is small. It is necessary to develop a zoom lens that does not pose a problem.

【手続補正２】[Procedure Amendment 2]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００１２[Correction target item name] 0012

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【００１２】一方この２群ズームレンズは、第２レンズ
群で変倍を行なうと、必然的に第１レンズ群によって像
面位置を補正しなければならず、そのため変倍の際に第
１レンズ群を移動させなければならない。したがって前
記の本発明の目的の一つが達成されない。On the other hand, in this two-group zoom lens, when the second lens group is used for zooming, the image plane position must be corrected by the first lens group, and therefore the first lens is used for zooming. You have to move the group. Therefore , one of the above-mentioned objects of the invention is not achieved.

【手続補正３】[Procedure 3]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００１３[Correction target item name] 0013

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【００１３】本発明のレンズ系は、広角端では、全体と
してレトロフォーカスタイプでありながら、複数のレン
ズ群よりなりズーミング時に第１レンズ群が固定で、第
２レンズ群，第３レンズ群，第４レンズ群とを少なくと
も有し、これら第２レンズ群から第４レンズ群のうちの
いずれかが変倍系，コンペンセーターの役割を有するも
のである。更に、必要に応じて最終レンズ群として像面
に対して固定である第５レンズ群を設けるようにした。At the wide-angle end, the lens system of the present invention is a retrofocus type as a whole, but is composed of a plurality of lens groups, the first lens group is fixed during zooming, and the second lens group, the third lens group, and the third lens group. At least four lens groups are provided, and any one of the second lens group to the fourth lens group serves as a variable power system and a compensator . Further, a fifth lens group, which is fixed to the image plane, is provided as the final lens group, if necessary.

【手続補正４】[Procedure amendment 4]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００１６[Correction target item name] 0016

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【００１６】以上のようにして、本発明は、前述の構成
とすると共に、前記条件（１），（２），（３）を満足
するようにした。As described above, the present invention has the above-mentioned configuration.
In addition , the above conditions (1), (2), and (3) are satisfied.

【手続補正５】[Procedure Amendment 5]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００２２[Name of item to be corrected] 0022

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【００２２】次に本発明において、固定群として第５レ
ンズ群を配置すると効果的であり、その作用はリレー系
としてよりも像面湾曲を補正するためのフィールドフラ
ットナーである。また広角端のレンズ系の焦点距離は、
本発明の主旨から考え、画面の対角線長より短いのが一
般的である。つまり下記の関係を満足することが一般的
である。 ｆｗ＜Ｄ ただしｆｗは広角端での全系の焦点距離、Ｄは画面対角
線長である。Next, in the present invention, it is more effective to dispose the fifth lens group as a fixed group, and its action is a field flattener for correcting field curvature than that of a relay system. The focal length of the lens system at the wide-angle end is
In consideration of the gist of the present invention, it is generally shorter than the diagonal length of the screen. That is, it is common to satisfy the following relationships. fw <D where fw is the focal length of the entire system at the wide-angle end, and D is the diagonal length of the screen.

【手続補正６】[Procedure correction 6]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００２４[Name of item to be corrected] 0024

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【００２４】また第３レンズ群と第４レンズ群の倍率の
相互の倍率積β３・β４は増倍関係にある。つまり前群
としての第１レンズ群と第２レンズ群とが増倍関係にあ
り、かつ第３レンズ群と第４レンズ群とで増倍関係にあ
り、相互に変倍を効率化していることがわかる。Further, the mutual magnification products β3 and β4 of the magnifications of the third lens group and the fourth lens group have a multiplication relationship. That is, the front group
It can be seen that the first lens group and the second lens group have a multiplication relationship, and the third lens group and the fourth lens group have a multiplication relationship, and thus the variable magnification is mutually efficient.

【手続補正７】[Procedure Amendment 7]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００３８[Correction target item name] 0038

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【００３８】又第３レンズ群は、正のレンズ成分と負の
レンズ成分よりなり、コンペンセーターとしての作用を
持たせてあり、第４レンズ群とはフローティングしてい
る関係にある。The third lens group is composed of a positive lens component and a negative lens component, acts as a compensator, and has a floating relationship with the fourth lens group.

【手続補正８】[Procedure Amendment 8]

【補正対象書類名】図面[Document name to be corrected] Drawing

【補正対象項目名】図１２[Name of item to be corrected] Fig. 12

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【図１２】 [Fig. 12]

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】物体側より順に、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、正又は負の第４レンズ群と、正の屈折力の第
５レンズ群とよりなり、第１レンズ群と第５レンズ群と
を結像面に対して固定し、第２レンズ群，第３レンズ群
および第４レンズ群を移動することによって広角端から
望遠端への変倍を行うレンズ系で、かつ次の条件を満足
することを特徴とするズームレンズ。 （１）０．５＜｜φ12w/φw ｜＜４．０ （２）０．０５＜｜φ34w/φw ｜＜１．５ （３）β3w・β4w＜β3T・β4T ただしφw は広角端における全系の屈折力、φ12w は広
角端における第１レンズ群と第２レンズ群との合成の屈
折力、φ34w は広角端における第３レンズ群と第４レン
ズ群との合成の屈折力、β3wは広角端における第３レン
ズ群の担う近軸横倍率、β4wは広角端における第４レン
ズ群の担う近軸横倍率、β3Tは望遠端における第３レン
ズ群の担う近軸横倍率、β4Tは望遠端における第４レン
ズ群の担う近軸横倍率である。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 negative refracting power in order from the object side.
The second lens unit includes a lens unit, a positive or negative fourth lens unit, and a fifth lens unit having a positive refractive power, and the first lens unit and the fifth lens unit are fixed to the image plane. A zoom lens which is a lens system that performs zooming from the wide-angle end to the telephoto end by moving the third lens unit and the fourth lens unit, and satisfies the following conditions. (1) 0.5 <| φ12w / φw | <4.0 (2) 0.05 <| φ34w / φw | <1.5 (3) β3w ・ β4w <β3T ・ β4T However, φw is the whole system at wide angle end. , Φ12w is the combined refracting power of the first lens group and the second lens group at the wide-angle end, φ34w is the combined refracting power of the third lens group and the fourth lens group at the wide-angle end, and β3w is the wide-angle end. , The paraxial lateral magnification of the third lens group, β4w is the paraxial lateral magnification of the fourth lens group at the wide-angle end, β3T is the paraxial lateral magnification of the third lens group at the telephoto end, and β4T is the paraxial lateral magnification of the third telephoto end. It is a paraxial lateral magnification that the four lens groups take. 【請求項２】物体側より順に、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、正又は負のの屈折力の第４レンズ群とより
なり、第１レンズ群が結像面に対してほぼ固定であり、
第２レンズ群，第３レンズ群および第４レンズ群を移動
し、かつ以下の条件を満足することを特徴とするズーム
レンズ。 （１）０．５＜｜φ12w/φw ｜＜４．０ （２）０．０５＜｜φ34w/φw ｜＜１．５ （３）β3w・β4w＜β3T・β4T ただしφw は広角端における全系の屈折力、φ12w は広
角端における第１レンズ群と第２レンズ群との合成の屈
折力、φ34w は広角端における第３レンズ群と第４レン
ズ群との合成の屈折力、β3wは広角端における第３レン
ズ群の担う近軸横倍率、β4wは広角端における第４レン
ズ群の担う近軸横倍率、β3Tは望遠端における第３レン
ズ群の担う近軸横倍率、β4Tは望遠端における第４レン
ズ群の担う近軸横倍率である。2. 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 negative refracting power in order from the object side.
A lens unit and a fourth lens unit having a positive or negative refractive power, and the first lens unit is substantially fixed with respect to the image plane,
A zoom lens characterized by moving the second lens group, the third lens group and the fourth lens group and satisfying the following conditions. (1) 0.5 <| φ12w / φw | <4.0 (2) 0.05 <| φ34w / φw | <1.5 (3) β3w ・ β4w <β3T ・ β4T However, φw is the whole system at wide angle end. , Φ12w is the combined refracting power of the first lens group and the second lens group at the wide-angle end, φ34w is the combined refracting power of the third lens group and the fourth lens group at the wide-angle end, and β3w is the wide-angle end. , The paraxial lateral magnification of the third lens group, β4w is the paraxial lateral magnification of the fourth lens group at the wide-angle end, β3T is the paraxial lateral magnification of the third lens group at the telephoto end, and β4T is the paraxial lateral magnification of the third telephoto end. It is a paraxial lateral magnification that the four lens groups take.
JP18285991A 1991-06-29 1991-06-29 Zoom lens and camera with zoom lens Expired - Fee Related JP3226297B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP18285991A JP3226297B2 (en) 1991-06-29 1991-06-29 Zoom lens and camera with zoom lens
US07/902,818 US5416639A (en) 1991-06-29 1992-06-23 Zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18285991A JP3226297B2 (en) 1991-06-29 1991-06-29 Zoom lens and camera with zoom lens

Publications (2)

Publication Number Publication Date
JPH0519169A true JPH0519169A (en) 1993-01-29
JP3226297B2 JP3226297B2 (en) 2001-11-05

Family

ID=16125701

Family Applications (1)

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

Country Link
JP (1) JP3226297B2 (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08152558A (en) * 1993-11-25 1996-06-11 Asahi Optical Co Ltd Zoom lens
JP2001174704A (en) * 1999-12-21 2001-06-29 Olympus Optical Co Ltd Zoom lens
JP2001235679A (en) * 2000-02-23 2001-08-31 Canon Inc Optical system, optical equipment having it, picture projector and image pickup unit
JP2001330775A (en) * 2000-05-22 2001-11-30 Canon Inc Zoom lens and projecting device using the same
JP2004310083A (en) * 2003-03-26 2004-11-04 Fuji Photo Optical Co Ltd Zoom lens and projection type display device using same
JP2007187879A (en) * 2006-01-13 2007-07-26 Konica Minolta Photo Imaging Inc Imaging optical system and imaging apparatus
EP2060944A3 (en) * 2007-11-07 2009-09-30 Samsung Electronics Co., Ltd. Compact zoom lens
JP2010044168A (en) * 2008-08-11 2010-02-25 Hoya Corp Wide-angle lens system
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