JPS60208723A - Fast zoom lens of high variable power - Google Patents

Abstract

PURPOSE:To improve aberration compensation by allowing an optical system which consists of the 1st and the 2nd lens groups with positive and negative refracting power, the 3rd lens group which corrects an image plane position, and the 4th lens group which performs fixed image-forming operation successively from an object side to meet specific requirements. CONSTITUTION:This lens system consists of the 1st lens group I for focusing which has positive refracting power, the 2nd lens group II for power variation which has negative refracting power, the 3rd lens group III which corrects the image plane position shifting according to power variation, and the 4th lens group IV which performs the fixed image forming operation successively from the object side. In inequalities, RIVi and phiIVi are the radius of curvature and refractive index of the (i)th lens in the 4th lens group counted from the object side, DIVi is the lens thickness or air gap of the (i)th lens, and fIVi and nuIVi are the focal length of the (i)th lens and Abbe number of the glass; and FIV1 and FIV2 are the focal lengths of the 1st and the 2nd lenses in the 4th lens group counted from the object side, (e) is the principal point interval of said lens group, and FW is the focal length of the whole system at the zoom position of the wide-angle side.

Description

【発明の詳細な説明】 最近の撮像管は技術進歩により結像特性の良いしかも色
再現性の良いものが得られるようになりビデオカメラ等
各方面で使用されてきている。ビデオカメラに用いる撮
像管はなるべく高感度であることが望まれておりこのこ
とはＣＯＤ等の固体撮像素子についても同様である。又
撮像管やＣＣＤ等と共に使用する撮影レンズも明るいこ
とすなわち大口径であることが望まれている。そしてビ
デオカメラの携帯性の点から小型軽量の撮影レンズが要
求されている。又光学性能は高変倍でおシレかも撮影画
角は標準画角を含みかつ広画角であるズームレンズが要
求されている。DETAILED DESCRIPTION OF THE INVENTION Recent technological advances have made it possible to obtain image pickup tubes with good imaging characteristics and good color reproducibility, and they are now being used in various fields such as video cameras. It is desired that the image pickup tube used in a video camera has as high a sensitivity as possible, and the same is true for solid-state image pickup devices such as COD. It is also desired that the photographing lens used with the image pickup tube, CCD, etc. be bright, that is, have a large aperture. From the viewpoint of portability of video cameras, there is a demand for compact and lightweight photographic lenses. In addition, a zoom lens is required that has optical performance with a high zoom ratio and a wide angle of view including the standard angle of view.

特開昭５８−１５３９１３号公報では変倍比６、広角端
のズーム位置での焦点距離が１１１１ＩＩ１１と広画角
を有した撮影レンズが提案されているが明るさがＦＮＯ
Ｌ　６とあまり明るいとは言えない。又特開昭５７−１
９７０９号公報では変倍比６、明るさがＦＮＯＬ　２と
明るいが広角端のズーム位置での焦点距離が１１．５ｍ
であシあまり広画角とは言えない０ 本発明は変倍比６で明るさがＦＮＯで１．２そして広角
端のズーム位置での焦点距離が１１５の大口径高変倍の
ズームレンズの提供を目的とし、特に％インチ管の画面
サイズを対象とし全変倍範囲にわたり良好に収差補正を
達成し、更に色再現性を良好にすべく略テレセントリッ
クな光学系となるように構成した大口径高変倍のズーム
レンズの提供を目的とする。JP-A-58-153913 proposes a photographic lens with a wide angle of view with a variable power ratio of 6 and a focal length of 1111II11 at the wide-angle end zoom position, but the brightness is FNO.
At L6, it cannot be said to be very bright. Also, JP-A-57-1
Publication No. 9709 has a zoom ratio of 6 and a brightness of FNOL 2, but the focal length at the wide-angle end zoom position is 11.5 m.
Therefore, it cannot be said that it has a very wide angle of view.The present invention is a large aperture, high variable power zoom lens with a zoom ratio of 6, a brightness of FNO of 1.2, and a focal length of 115 at the wide-angle end zoom position. This large-diameter optical system is designed to achieve good aberration correction over the entire zoom range, especially for screen sizes of % inch tubes, and is configured with a nearly telecentric optical system to further improve color reproducibility. The purpose is to provide a zoom lens with a high zoom ratio.

本発明の目的を達成する為のズームレンズのレンズ構成
の主たる特徴は物体側より順に正の屈折力のフォーカシ
ング用の第ルンズ群、負の屈折力の変倍用の第２レンズ
群、変倍により変動する像面位置を補正する為の第３レ
ンズ群そして固定の結像作用をする第４レンズ群の４つ
のレンズ群を有するズームレンズにおいて物体側より順
に前記第４レンズ群は正の屈折力の第４　レンズ群と正
の屈折力の第４□　レンズ群工 ０２つのレンズ群を有しており前記第４□レンズ群は物
体側に比べ像面側に強い屈折力を有する正の屈折力の第
４□□レンズ、両レンズ面が凸面の第４□２レンズ、像
面側ｊに凸面を向けた負の屈折力のメニスカス状の第４
．３レンズそして像面側に比べ物体側に強い屈折力を有
する正の屈折力の第４□４レンズ金有しており、前記第
　４□レンズ群は物体側へ凸面を向けた負の屈折力のメ
ニスカス状の第４□ルンズ、両レンズ面が凸面の第４゜
２レンズそして像面側に比べ物体側に強い屈折力を有す
る正の屈折力の第４゜３レンズを有しておシ前記第４レ
ンズ群の物体側から数えて第１番目のレンズ面の曲率半
径ｔ−％ｉ　、屈折力をφＩＶｉ　’第１番目のレンズ
厚及び空気間隔ｋ　Ｄ■ｌ　、第１番目のレンズの焦点
距離とガラスのアツベ数を各々ｆＷ、　、ν唱、前記第
４□レンズ群と第４□レンズ群の焦点距離を各々Ｆ９□
。The main features of the lens configuration of a zoom lens to achieve the object of the present invention are, in order from the object side, a focusing lens group with positive refractive power, a second lens group with negative refractive power for variable power, and a variable power lens group. In a zoom lens, the fourth lens group has four lens groups: a third lens group for correcting the image plane position that changes due to the change in the image plane position, and a fourth lens group for performing a fixed imaging function.In order from the object side, the fourth lens group has positive refraction. 4th lens group with power and 4th lens group with positive refractive power It has two lens groups, and the 4th lens group has a positive refractive power that has stronger refractive power on the image side than on the object side. 4th □□ lens with high power, 4th □2 lens with convex surfaces on both lens surfaces, and meniscus-shaped 4th lens with negative refractive power with the convex surface facing the image plane side j.
．． 3 lenses and a 4th lens with a positive refractive power that has stronger refractive power on the object side than on the image side, and the 4th □ lens group has a negative refractive power with a convex surface facing the object side. It has a meniscus-shaped 4th lens, a 4°2 lens with both convex lens surfaces, and a 4°3rd lens with a positive refractive power that has stronger refractive power on the object side than on the image side. The radius of curvature of the first lens surface counting from the object side of the four lens groups is t-%i, the refractive power is φIVi', the thickness of the first lens and the air distance kD■l, the focal length of the first lens and the Atsube number of the glass are respectively fW, , ν, and the focal lengths of the fourth □ lens group and the fourth □ lens group are respectively F9□.
.

ＦＩＶ２　、前記第４□　レンズ群と第４□レンズ群と
の主点間隔ｔ−ｅ　Ｎ全系の広角端のズーム位置での焦
点距離ヲＦＷとするとき ０．８　＜　ｌＲ■５　／Ｒｙ７１　（０，９５・・・
・・・・・・（１１０，７５＜　ＩＲ■、ｏ／Ｒ■□□
Ｉ　＜　０．９０　・−・・・・（２）１９（げ■５／
ＦＷＩ　＜　３．２　−・・−（３１７，０〈げＩＶ６
／ＦＷ＋　＜　＆５　・−・−’　（４１−０，０２＜
φＭ８−ＦＷ　＜　０．０２　＝”・＝・ｆ５）１、５
　＜　ＤｌｙＢ　／　ＦＷ　（１，８−・−（６）３、
０　（ｅ　／Ｆｗ　（３−６＝・＝−・・（７）１．６
　（ＦＷ２／Ｆ■、＜　１．８　、＝＝−’−（８１１
０（シ■６／ν■５＜２５　・・・・−・・（９）なる
諸条件全満足することである。FIV2, principal point interval te between the fourth □ lens group and the fourth □ lens group 0.8 <lR■5/Ry71 (when the focal length of the entire system at the zoom position at the wide-angle end is FW) 0,95...
・・・・・・(110,75< IR■, o/R■□□
I < 0.90 ・-・・・・(2) 19(ge■5/
FWI < 3.2 −・・−(317,0〈GIV6
/FW+ <&5・−・−'(41−0,02<
φM8-FW < 0.02 =”・=・f5) 1, 5
<DlyB/FW (1,8-・-(6)3,
0 (e /Fw (3-6=・=-・・(7)1.6
(FW2/F ■, < 1.8, ==-'-(811
0 (Sh■6/ν■5<25 (9)).

本発明は前述の如く４群ズームレンズにおいて第４レン
ズ群のレンズ構成ｔ″特定することＫよって大口径でし
かも高変倍のズームレンズを達成している。As described above, the present invention achieves a zoom lens with a large aperture and high variable power by specifying the lens configuration t'' of the fourth lens group in a four-group zoom lens.

本発明においては大口径高変倍で小型＠量化を図りしか
も画質の低下防止を図る為に各収差のうち特に球面収差
及びコマ収差全良好に補正している。又ビデオカメラに
限らずＴＶカメラで使用するときでも良好なる色再現性
が得られるようにテレセントリックな光学系を採用して
いる。In the present invention, a large aperture and a high variable power zoom lens are used, and in order to achieve compactness and to prevent deterioration of image quality, spherical aberration and coma aberration are particularly well corrected. In addition, a telecentric optical system is used to ensure good color reproducibility not only for video cameras but also for TV cameras.

本発明においては第１、第２、第３レンズ群より成る変
倍系から第４レンズ群へは大口径である為に大きく発散
する光束が入射する。そこで第４レンズ群を正の屈折力
の第４□　レンズ群と第４゜レンズ群の２つのレンズ＃
金光軸上離れて配置させて、大きく発散してくる光束を
順次収斂させて収差発生量を少なくしている。特に球面
収差の発生量を少なくする為に第４□□レンズを物体側
に比べ像面側に強い屈折力を有する正の屈折力のレンズ
とし、又第４．２レンズを両レンズ面が凸面のレンズと
している。そして第４１３レンズ、１４１４レンズ及び
第４２　レンズ群を前述のレンズ形状とすることによっ
て諸収差のうち特に球面収差とコマ収差を良好に補正し
ている。In the present invention, a light beam that diverges greatly is incident on the fourth lens group from the variable magnification system consisting of the first, second, and third lens groups due to its large aperture. Therefore, the 4th lens group is composed of two lenses, the 4th□ lens group and the 4th lens group, which have positive refractive power.
The gold lenses are placed apart on the optical axis to sequentially converge the widely divergent light beams to reduce the amount of aberration. In particular, in order to reduce the amount of spherical aberration, the 4th □□ lens is a lens with positive refractive power that has stronger refractive power on the image side than on the object side, and the 4th and 2nd lenses have both lens surfaces convex. It is used as a lens for By forming the 413th lens, the 1414th lens, and the 42nd lens group into the lens shapes described above, spherical aberration and coma aberration among various aberrations are effectively corrected.

次に前述の各条件式の技術的意味について説明する。Next, the technical meaning of each of the above conditional expressions will be explained.

条件式（１）は第４□３レンズの物体側のレンズ面と第
４□４レンズの物体側のレンズ面の曲率半径の比に関す
るもので第４□□レンズの物体側のレンズ面と第４□４
レンズの物体側のレンズ面より発生した球面収差を第４
□３レンズの物体側のレンズ面によシ良好に補正する為
でおり、条件式（１）の上限値を越えると球面収差が補
正過剰となり又下限値を越えると補正不足となる。Conditional expression (1) relates to the ratio of the radius of curvature between the object-side lens surface of the 4th □3 lens and the object-side lens surface of the 4th □4 lens. 4□4
The spherical aberration generated from the object-side lens surface of the lens is expressed as the fourth
□ This is to provide good correction to the object-side lens surface of the three lenses. If the upper limit of conditional expression (1) is exceeded, the spherical aberration will be over-corrected, and if the lower limit is exceeded, the spherical aberration will be under-corrected.

条件式（２）は第４□□レンズの像面側のレンズ面と第
４□２レンズの物体側のレンズ面の曲率半径の比に関す
るものであシ第４□ルンズの像面０１１１のレンズ面か
ら発生する負の３次コマ収差ト３次非点収差を第４゜２
レンズの物体側のレンズ面によシ補正し良好なる画角特
性を得る為である。Conditional expression (2) is related to the ratio of the radius of curvature of the lens surface on the image side of the 4th □□ lens and the lens surface on the object side of the 4th □2 lens. Negative third-order comatic aberration and third-order astigmatism generated from the surface are expressed as 4°2
This is to correct for the lens surface on the object side of the lens to obtain good angle of view characteristics.

条件式（２）の上限値を越えると外向性コマ収差が発生
し又下限値を越えると内向性コマ収差が発生し、又非点
収差の良好なる補正が困難となる。When the upper limit of conditional expression (2) is exceeded, extroverted coma aberration occurs, and when the lower limit is exceeded, introverted coma aberration occurs, and it becomes difficult to satisfactorily correct astigmatism.

条件式＋３１　、　（４）　、（５）は第４゜ルンズと
第４゜２レンズの焦点距離と第４□４レンズの像面側の
レンズ面の屈折力に関するものである。Conditional expressions +31, (4), and (5) relate to the focal lengths of the 4th lens and the 4°2 lens, and the refractive power of the lens surface on the image plane side of the 4th □4 lens.

条件式（３）の上限値を越えて第４□□レンズの屈折力
が弱くなると球面収差が補正過剰となり又下限値を越え
ると高次の球面収差が発生し、これを良好に補正するの
が困難となる。If the upper limit of conditional expression (3) is exceeded and the refractive power of the fourth □□ lens becomes weak, spherical aberration will be overcorrected, and if the lower limit is exceeded, higher-order spherical aberration will occur, and it is difficult to properly correct this. becomes difficult.

条件式（４）は条件式（３）のもとて大口径にもがかわ
らず諸収差を良好に補正する為であシ、特に輪帯球面収
差金小さくする為である。条件式（４）の上限値を越え
て第４□２レンズの屈折力が弱くなると球面収差が補正
過剰となシ又下限値を越えると輪帯球面収差が大きくな
ってくる。The purpose of conditional expression (4) is to satisfactorily correct various aberrations despite the large aperture under conditional expression (3), and in particular to reduce the annular spherical aberration. If the upper limit of conditional expression (4) is exceeded and the refractive power of the fourth □2 lens becomes weak, the spherical aberration will be overcorrected, and if the lower limit of conditional expression (4) is exceeded, the annular spherical aberration will increase.

条件式（５）れ第４□　レンズ群の第４□□レンズの物
体側のレンズ面から第４□４レンズの物体側のレンズ面
Ｋかけて補正された球面収差を全体的に良好に整える為
のものであり、条件式（５）の上限値若しくは下限値を
越えると球面収差の補正量が大きくなりすぎ全体として
良好なる収差補正が困難となる。Conditional expression (5) makes the spherical aberration corrected by multiplying from the object-side lens surface of the 4th □□ lens in the 4th □ lens group to the object-side lens surface K of the 4th □ 4th lens into a good overall condition. If the upper limit or lower limit of conditional expression (5) is exceeded, the amount of correction for spherical aberration becomes too large, making it difficult to correct aberrations favorably as a whole.

条件式（６）　、　（７）　、　（ｓ）はテレセントリ
ックな光学系を良好に達成する為のものである。Conditional expressions (6), (7), and (s) are for achieving a good telecentric optical system.

条件式（６）は第４□レンズ群と第４□レンズ群との空
気間隔に関し、条件式（カは第４□　レンズ群と第４゜
レンズ群の主点間隔に関し、又条件式（８）は第４□　
レンズ群と第４□　レンズ群の屈折力の比に関するもの
である。いずれの条件式においても上限値を越えると射
出瞳位置が物体側から像面側へ近づいてしまい良好なる
テレセントリック光学系を得るのが難しくなる。又いず
れの条件式においても下限値を越えると第　４□レンズ
群のレンズ外径が大きくなりすぎ又射出瞳位置が像面側
に近づいてくるので良好なるテレセントリックな光学系
を得るのが碌しく特に条件式（８）の下限値を越えると
バックフォーカスが不足してくるので好ましくない。Conditional expression (6) concerns the air distance between the 4th □ lens group and the 4th □ lens group, conditional expression (6) concerns the distance between the principal points of the 4th □ lens group and the 4th degree lens group, and conditional expression (8) ) is the 4th □
This relates to the ratio of refractive power between the lens group and the fourth □ lens group. In any of the conditional expressions, if the upper limit is exceeded, the exit pupil position approaches the image plane side from the object side, making it difficult to obtain a good telecentric optical system. Also, in any of the conditional expressions, if the lower limit is exceeded, the outer diameter of the lens of the 4th lens group becomes too large, and the exit pupil position approaches the image plane side, making it difficult to obtain a good telecentric optical system. In particular, if the lower limit of conditional expression (8) is exceeded, the back focus becomes insufficient, which is not preferable.

条件式（９）は第４゜、レンズと第４□２レンズのガラ
スのアツベ数に関し、色収差を良好に補正する為のもの
である。条件式（９）の上限値を越えると色収差が補正
不足となシ又下限値を越えると補正過剰となる。Conditional expression (9) relates to the Abbe number of the glass of the 4th lens and the 4th □2 lens, and is intended to satisfactorily correct chromatic aberration. If the upper limit of conditional expression (9) is exceeded, the chromatic aberration will be under-corrected, and if the lower limit is exceeded, the chromatic aberration will be over-corrected.

本発明は以上の諸条件を満足させることにょシ大ロ径高
変倍のズームレンズを達成するととができるが特に変倍
による色収差の変動を少なくする為には第３レンズ群に
正と負の屈折力のレンズを貼合わせた貼合わせレンズを
有するように構成するのが好ましい。The present invention can achieve a zoom lens with a large diameter and high zoom ratio by satisfying the above conditions, but in particular, in order to reduce fluctuations in chromatic aberration due to zooming, it is necessary to add positive and negative lenses to the third lens group. It is preferable to use a laminated lens made of laminated lenses having a refractive power of .

本発明において絞シを第３レンズ群と第４レンズ群との
間に配置させている。In the present invention, the diaphragm is disposed between the third lens group and the fourth lens group.

以上のように本発明によれば大口径でしかも高変倍の良
好に収差補正を行ったズームレンズを達成することがで
きる。As described above, according to the present invention, it is possible to achieve a zoom lens that has a large aperture, has a high zoom ratio, and is well-corrected for aberrations.

次に本発明の数値実施例を示す。数値実施例においてＲ
ｉ　は物体側よシ順に第１番目のレンズ面の曲率半径、
Ｄｉは物体側より第１番目のレンズ厚及び空気間隔、Ｎ
　とν、は各々物体１ 側よシ順に第１番目のレンズのガラスのＪａｌ折率とア
ツベ数である。Next, numerical examples of the present invention will be shown. In numerical examples R
i is the radius of curvature of the first lens surface in order from the object side,
Di is the first lens thickness and air distance from the object side, N
and ν are the Jal refractive index and Atsube number of the glass of the first lens in order from the object 1 side, respectively.

尚数値実施例において像面近傍に配置した平行平面板は
撮像管、ＣＣＤ等の７エースプレートを示す。In the numerical examples, the parallel plane plate disposed near the image plane represents a 7-ace plate of an image pickup tube, CCD, etc.

数値実施例Ｉ Ｆ−１０，９９〜う５．０９　ＦＮＯ−１：Ｌ２　ω−
２６，６”−屯８゜Ｒ１”　１６＆９２　Ｄ　１−　！
７０　Ｎ　１−１．８０５１８　ｖ　１−２５．４Ｒ２
賦　５４．２７　Ｄ　２−１λ２０　Ｎ　２−１．６０
３１１　νつ−６０，７Ｈ＋ｍ−１２ｓ、１ｏ　Ｄ　３
脂０．１０Ｒ−４４７１Ｄ　−７，００Ｎ　−１，６９
６８０シ３−５５．５４　４　３ Ｒ５−１３０−７２Ｄ　５−可変 Ｒ−３７１，３７Ｄ　６−１．００　Ｎ　４−１．７７
２５０　シ４−４９．６Ｒ−１９，１２Ｄ　７−５．７
２ Ｒ−−２３，４０Ｄ　Ｂ−１，００Ｎ　５−１．６９６
８０　シ５−５５．５Ｒ＝　２１２０　Ｄ　９−３．５
０　Ｎ　６−１．８４６６６　ｖ　６−２３．９ＲＩＯ
−１７８６，３７Ｄｌｏ−可変 Ｒ１１−−２６，１０Ｄｌｌｍｌ、００　Ｎ　７−Ｌ７
７２５０　ｙ　７−４９．６Ｒ１２−４７，８９Ｄｉ２
−３．６０　Ｎ　８−１．７６１８２　シ８−２６．６
８よ、−−１７０，２９Ｄ、−可変 Ｒ１４−絞り　Ｄ、４−１．３０ Ｒ”　ｏｃＩＤｌｓ−５，４０Ｎ　９”Ｌ６０３１１　
ｐ　９−６０．７５ Ｒ−−２４，９８Ｄｌｏ−０，１０ ６ Ｒ１７−８４，８６Ｄｉ７−５．００　Ｎ１ｏ−１，６
０３１１ｖｌｏ−６０，７Ｒ−−６１，６４Ｄｉ８−３
．００ ８ ”１９斡−２６，５４Ｄ　ｌ　ｇ細１．２０　Ｎ１１−
１．８０５１８　シ１１−２５．４Ｒ２ｏ−−６６，１
８Ｄ２ｏ−０，１０Ｒ−３Ｌ６７　Ｄ　−５，７０Ｎｌ
２−１６２２９９シ１２−５＆２２１　２１ Ｒ２２−−８２１０９Ｄ２２−１＆８８Ｒ２３＝　５４
．０１　Ｄ２３−１．００　Ｎ１５−Ｌ８０５１８　ｖ
１３−２５．４Ｒ２４−１７，０２Ｄ２．−　Ｌ５７ Ｒ２５−１９，６８０２５−５，４０Ｎ、４＝Ｌ５１７
４２　ｙ１４−５Ｌ４Ｒ２６−−７Ｌ２４　Ｄ２６−０
．１０Ｒ２７”　３４．３８　Ｄ２７−３．５０　Ｎ１
５−Ｌ６９６８０　ｖ１５−５５．５Ｒ２８ｍｏｏＤ２
８ｍ−３，ｏＯ Ｒ２ｇ　−ｏｏ　Ｄｚ９−９．８０　Ｎｌ６−Ｌ６９５
００　ｙ１６−４Ｌ２Ｒ３０−〇 数値実施例２ Ｆ−ＩＬＯ９〜６５．６５　ＦＮＯ−１：１２　ｍ−２
６，４°〜４．８’Ｒ１−１６３，７４Ｄ　Ｉ−！７０
　Ｎ　１−Ｌ８０５１８　ｙ　１−２Ｌ４Ｒ２−５４２
６Ｄ　２””ＩＬ２０　Ｎ　２−１．６０３１１　ｙ　
２−６０．７Ｒ■　４４．５０　Ｄ　−７，００Ｎ　３
−１．６９６８０　ν　３−５５．５４　４ Ｒ５継１３１．７８　Ｄ　５−可変 Ｒ６−１８７，５６Ｄ　６−　ＬＯＯＮ　、−Ｌ７７２
５０　Ｕ　４−４９．６Ｒ７−１＆７７　Ｄ　７−　＆
７２ Ｒ８−−ｚＺ６ａ　Ｄ　８−　１．００　Ｎ　５纏１６
９６８０　ν　５−５５．５Ｒｇ−２１６３Ｄ　９−１
５０　Ｎ　６−Ｌ８４６６６　ｙ　６−２＆９Ｒ＝１４
２７．２２　ＤＩＯ−可変 ０ Ｒ１１−−２５，７２Ｄｌｌ−ＬＯＯＮ　７−１．７７
２５０　ν　７”’４９．６Ｒ１２−５０，３３Ｄｉ２
−　＆６０　Ｎ　８−１．７６１８０　シ８−２７．Ｉ
Ｒ□３−１５６．７００，３−可変 Ｒ１４−絞シＤ工、−１，３０ Ｒ１５＝　”　Ｄｉ５−　６．００　Ｎ　９＝１．６０
３１１　ｖ　９−６０．７Ｒ五６−−２５．８３０１６
−１．００Ｒ１７−７７，８３０−６，５０Ｎ、ｏ−Ｌ
６０３１１　シ１ｏ−６０．７７ Ｒ□ｓ−−５＆７９　Ｄ□ｓ−２，ｓ。Numerical Example I F-10,99~U5.09 FNO-1:L2 ω-
26,6”-Tun8゜R1” 16&92 D 1-!
70 N 1-1.80518 v 1-25.4R2
Fee 54.27 D 2-1λ20 N 2-1.60
311 ν-60,7H+m-12s, 1o D 3
Fat 0.10R-4471D -7,00N -1,69
680shi 3-55.54 4 3 R5-130-72D 5-variable R-371,37D 6-1.00 N 4-1.77
250 Shi4-49.6R-19,12D 7-5.7
2 R--23,40D B-1,00N 5-1.696
80 5-55.5R= 2120 D 9-3.5
0 N 6-1.84666 v 6-23.9RIO
-1786,37Dlo-Variable R11--26,10Dllml, 00 N 7-L7
7250y 7-49.6R12-47,89Di2
-3.60 N 8-1.76182 C 8-26.6
8,--170,29D,-Variable R14-Aperture D,4-1.30 R”ocIDls-5,40N 9”L60311
p 9-60.75 R--24,98Dlo-0,10 6 R17-84,86Di7-5.00 N1o-1,6
0311vlo-60,7R--61,64Di8-3
．． 00 8” 19㎡-26,54D lg thin 1.20 N11-
1.80518 Shi11-25.4R2o--66,1
8D2o-0,10R-3L67 D-5,70Nl
2-162299shi12-5&221 21 R22--82109D22-1&88R23=54
．． 01 D23-1.00 N15-L80518 v
13-25.4R24-17,02D2. - L57 R25-19, 68025-5, 40N, 4=L517
42 y14-5L4R26--7L24 D26-0
．． 10R27" 34.38 D27-3.50 N1
5-L69680 v15-55.5R28mooD2
8m-3, oO R2g -oo Dz9-9.80 Nl6-L695
00 y16-4L2R30-〇 Numerical Example 2 F-ILO9~65.65 FNO-1:12 m-2
6,4°~4.8'R1-163,74D I-! 70
N 1-L80518 y 1-2L4R2-542
6D 2””IL20 N 2-1.60311 y
2-60.7R ■ 44.50 D -7,00N 3
-1.69680 ν 3-55.54 4 R5 joint 131.78 D 5-variable R6-187,56D 6-LOON, -L772
50 U 4-49.6R7-1 & 77 D 7- &
72 R8--zZ6a D 8- 1.00 N 5 16
9680 ν 5-55.5Rg-2163D 9-1
50 N 6-L84666 y 6-2&9R=14
27.22 DIO-Variable 0 R11--25,72Dll-LOON 7-1.77
250 ν 7”'49.6R12-50,33Di2
- &60 N 8-1.76180 C8-27. I
R□3-156.700, 3-Variable R14-Drawing D, -1,30 R15= ” Di5- 6.00 N 9=1.60
311 v 9-60.7R56--25.83016
-1.00R17-77,830-6,50N, o-L
60311 S1o-60.77 R□s--5&79 D□s-2,s.

ＲＭａ−２＆０１　Ｄ　−１，２０Ｎ　−１，８０５１
８シ１ｌ−ｚｓ、４１９　１９　１１ Ｒ２ｏ−−７１３ａ　Ｄ２ｏ−０，１０Ｒ２１麿　３２
ｈ３７　Ｄ２１−　６．４０　Ｎ１２−１．６２２９９
　シ１２−５８．２Ｒ２２−−８１＆９２　Ｄ２２鴎１
６．９０Ｒ２３−４９，３９０２３−ＬＯＧ　Ｎ、３−
Ｌ８０５１８　ν、３−２　＆４Ｒ２，−１ａ９６　Ｄ
２４−１２０ Ｒ２５−２Ｌ５５　Ｄ２５−７．００　Ｎ１４讃１．５
１７４２　シ１４−５λ４Ｒ２６−−６４，５５Ｄ２６
−０．１０Ｒ２７−３９，５１Ｄ２７−４．００　Ｎ□
５−１．６９６８０　シ１５−５５．５”２Ｂ”　６６
Ｄ２８〜３．０Ｏ Ｒ２’ｇ−”　０２ｇ−９，８０Ｎ１６−１．６９５０
０　ｙｌｏ−４Ｚ２Ｒ３ｏ−ｏｏＤ３ｏ−２，００ Ｒ３１−ｏｏＤ３１−１００　Ｎ□７−１．５１６３３
　シ１７−６４．１Ｒ３２″″　” 数値実施例３ Ｆ−１０，９９〜６５．０９　ＦＮＯ−１：Ｌ２　ω−
２６，６″〜４８゜Ｒ１”　１６＆９２　Ｄ　ｌ＝　１
７０　Ｎ　ｌ−１８０５１８ｙ　１−２５．４Ｒ２ｍ＋
　５４．２７　Ｄ　２−ＩＬ２０　Ｎ　２−１．６０３
１１　ｐ　２−６０．７Ｒ３−−１２＆１０　Ｄ　３−
　０．１０Ｒ、”　４４７Ｌ　Ｄ　、−７，００Ｎ　３
−Ｌ６９６８０　ｙ　３−５５．５Ｒ５−１３０，７２
０５−可変 Ｒ６−３７１，３７Ｄ　６−１．００　Ｎ　４−１．７
７２５０　ｖ　４−４９．６Ｒ７誼　１９．１２　Ｄ　
７冒　５．７２Ｒ”　−２３，４０Ｄ　−１，００Ｎ　
−１，６９６８０ｖ　５−５５．５８　８　５ Ｒ９〜　２Ｚ２０　Ｄ　９−３．５０　Ｎ　６−１．８
４６６６シ６−２３．９ＲＩＯ−１７８６，３７ＤＩＯ
−可変 Ｒ１１−−２６，１０Ｄｌｌ−１，００Ｎ　７−１．７
７２５０　シアー４９．６Ｒ１２−４７，８９Ｄ１２−
　３．６０　Ｎ　８−１．７６１８０　ｖ　８−２７．
１Ｒ□３−１７０．２９　Ｄ、３−可変 Ｒ工、−絞り　Ｄ１４−１．３０ Ｒ１５−ｏｏＤ１５−５．４０　Ｎ　９−１．６０３１
１　シタ−６０，フＲ□６−−２４９８　Ｄよ。−０，
１０Ｒ１７−８４８６Ｄｌｌ−５，００Ｎ１ｏ−１，６
０３１１ｙｌｏ−６０，７Ｒ１８票−６Ｌ６４　Ｄ１８
−３．００Ｒ１９■−２６，５４Ｄｌｏ−１２０Ｎ１１
−１．８０５１８　シ１１−２５．ａＲ２ｏ−−６６，
１８Ｄ２ｏ−０，１０Ｒ２１”　３Ｌ６７　Ｄ２１−５
．７０　Ｎ１２−１．６２２９９　ｖ１２−５８．２Ｒ
２゜−一８２ふ０９　Ｄ２２−１＆８８Ｒ２３−５４，
０１Ｄ２３−１．００　Ｎ、−１，８０５１８ｖ□３−
２５．４Ｒ２，−１７，０２Ｄ２．−　１．５７Ｒ２５
−１９，６８Ｄ２５”　５．４０　Ｎ１．−１．５１７
４２　ｙ１４−５１４Ｒ２６−−７１２４０ｚ６−０．
１０ Ｒｚ７＝　３４．３８　Ｄｚ７−　＆５０　Ｎ１５”１
．６９６８０　ｙ１５−５５．５Ｒ２８−６ｏ　Ｄ２８
−＆００ Ｒ２ｇ”　”　Ｄ２９−９．８０　Ｎ１６−１．６９５
００　ｙｌｏ−４２，２３０−− 数値実施例４ Ｆ−ＩＬＯ６〜６５．５１　ＦＮＯ−１：１．２　ω−
２６，ｆ〜４．８゜Ｒ１”　１６＆１５　Ｄ　ｌ−Ｒ７
０Ｎ　１−１８０５１−８　ｙ　□−２＋１Ｌ４Ｒ２”
　５＆０２　Ｄ　２−ＩＬ４０　Ｎ　２−１６０３１１
　ｙ　２−６０．７Ｒ３−１４７，７３Ｄ　３−０．１
０ Ｒ４”　４６．５８　Ｄ　４−　７．２０　Ｎ　３−Ｌ
６９６８０　ｙ　３−５５．５Ｒｓ−１６１−９４０５
讃可変 Ｒ６−２３４，８３Ｄ　６−　ＬＩＯＮ　−Ｌ７７２５
０　ｙ　４−４９．６Ｒ７−１９，６６０７−６，００ Ｒｓ”　−２４３３Ｄ　Ｂ−１，００Ｎ　５−１．６９
６８０　ｖ　５−５５．５Ｒ９−２３，４１Ｄ　９−３
．５０　Ｎ　６−１．８４６６６　ジロー２３．９Ｒ１
ｏ−１２９７，２８Ｄｌｏ−可変 Ｒ１１−−３０，２１Ｄｌｌ−ＬＯＯＮ　７−Ｌ７７２
５０　ｖ　７−４９．６Ｒ１２”　１１８．８０　Ｄ１
２−３．２０　Ｎ　８−１．８４６６６　ｖ　８−２３
．９Ｒ，３−−５０Ｚ２８　Ｄ１３麿可変 Ｒ□４−絞シＤ工、−Ｒ３０ Ｒ１５−−Ｄ１５−　５．４０　Ｎ　９−１．６０３１
１　ｖ　９−６０．７Ｒ１６■　−２６，＋、２　Ｄ１
６−　０．１０Ｒ１７”’　８＆１８　Ｄｌｌ””　５
．００　Ｎ１ｏ−Ｌ６０３１１　ｖｌｏ−６０，７Ｒ１
８−−８６，８８Ｄより−＆１３ Ｒ１ｇ−−２６，４９Ｄｌｇ−１，２０Ｎ１１−Ｌ８０
５１８　ｖｌｌ−２５，４Ｒ２ｏ−−４９，０９０２（
、−０，１０Ｒ２１−３Ｌ８４　Ｄ２１−　５．７０　
Ｎ１２−１．６２２９９　シ１２−５８．２Ｒ２２−−
３６７．８４　Ｄ２２−１＆２２Ｒ２ａ””　３４９０
　Ｄ２３−　ＬＯＯＮｘａ＝Ｌ８０５１８　シ１３−２
５．４”２４諺　１＆１３　Ｄ２４−　Ｌ６７Ｒ２５−
１７，６５Ｄ２５−５．４０　Ｎ１４”’１５５９６３
　シ１４−６１．２Ｒ２６−−５３＆３５　Ｄ２６−０
．１０Ｒ２７−３５，０５Ｄ２７−３．５６　Ｎ□５−
１．６９６８０　ν、５−５５．５Ｒ２８−−Ｄｚ８−
３．００ Ｒ２９”　ｏｏ　Ｄ２ｇ−９，８０Ｎ１６−１６９５０
０　ｙ１６−４Ｚ２Ｒ３０″″ 数値実施例５ Ｆ−１１，００〜６５．９２　ＦＮＯ−１：１．２　ω
〜２６．６“〜４８゜Ｒ、−１８３，３５Ｄ　１−　Ｚ
７０　Ｎ　１−１．８０５１８ν１−２５．４Ｒ−５６
，４２Ｄ　２−１′２．．２０　Ｎ　２−１６０３１１
　ｙ　２−６０．７Ｒ−−１２５，１４Ｄ　３−０．１
０ Ｒ４−４４１２Ｄ　４ａ−７，００Ｎ　３−Ｌ６９６８
０ν３−５５．５Ｒｓ”　１２７．５７　Ｄ　５−可変 Ｒ６−−４３９，８６Ｄ　６−１．００　Ｎ　４−Ｌ７
７２５０　シイ−４９，６Ｒ７−２１，２７Ｄ　７−５
．７２ Ｒｓ”　−２６，６９Ｄ　ｓ”　ｔｏｏ　Ｎ　５−１．
６９６８０ν５−５５．５Ｒ９−２１，６２Ｄ　９−３
．５０　Ｎ　６−１．８４６６６シ６−２３．９Ｒ１０
−２１１４８Ｄｌｏ−−可変 Ｒ，ｌ−−２９，２５Ｄｌｌ”　１．００　Ｎ　７−１
．７７２５０　ｖ　７−４９．６Ｒ１２−６９，１８Ｄ
Ｉ２”　２．９０　Ｎ　Ｂ−１，８４６６６ｖ　８−２
３．９Ｒ□３−２７９５．６６　Ｄ、３−可変Ｒ１４−
絞り　Ｄ１４−１．３０ Ｒ１５−”　Ｄ１５−”、４０　Ｎ　９−１．６０３１
１　ｖ　９−６０．７Ｒ□６−　−２５．５０　Ｄ□６
−６．１゜Ｒ１７”　６７．０１　Ｄ、７−５．００　
Ｎ１ｏ−１，６０３１１ｖ、ｏ−６０，７Ｒ，８−−７
１２３Ｄ１８−３．１３ Ｒ１９”　−２８，３６Ｄ１９−１．２０　Ｎ１１−１
．８０５１８ν１１−２５．４Ｒ２ｏ−−５８，５３Ｄ
２ｏ−０，１０Ｒ２１−３０，９４０２１−５，７０Ｎ
１２−１．６２２９９シ１２−５８．２Ｒ２２−３８０
，８９Ｄ２２釉１８．２２Ｒ２３”　４１９３　Ｄ２３
−１．００　Ｎ１３−１．８０５１８　ｙ１３−２５．
４Ｒ２４−１５，８８０２４−１，６７ Ｒ２５−１＆６４　Ｄ２５−５．４０　Ｎ１４−１．５
５９６３　シ１４−６１．２Ｒ２６−−１２１，１９Ｄ
２６−０．１０Ｒ２７−３６，２４Ｄ２７”　３．５６
　Ｎ１５−１．６９６８０　シ１５−５５．５Ｒ２８−
閃　Ｄ２８陶３．００ Ｒ２９−−１Ｄ２９−９．８０　Ｎ、６−１．６９５０
０　ｖ、６−４Ｌ２Ｒ３０″″　“RMa-2&01 D-1,20N-1,8051
8shi1l-zs, 419 19 11 R2o--713a D2o-0,10R21maro 32
h37 D21- 6.40 N12-1.62299
Shi12-58.2R22--81&92 D22 Ugu 1
6.90R23-49, 39023-LOG N, 3-
L80518 ν, 3-2 &4R2,-1a96 D
24-120 R25-2L55 D25-7.00 N14 San 1.5
1742 Shi14-5λ4R26--64,55D26
-0.10R27-39,51D27-4.00 N□
5-1.69680 15-55.5"2B" 66
D28~3.0O R2'g-" 02g-9,80N16-1.6950
0 ylo-4Z2R3o-ooD3o-2,00 R31-ooD31-100 N□7-1.51633
17-64.1R32″″ ” Numerical Example 3 F-10,99~65.09 FNO-1:L2 ω-
26,6″～48°R1″ 16&92 D l= 1
70 N l-180518y 1-25.4R2m+
54.27 D 2-IL20 N 2-1.603
11 p 2-60.7R3--12 & 10 D 3-
0.10R, 447L D, -7,00N 3
-L69680y 3-55.5R5-130,72
05-Variable R6-371, 37D 6-1.00 N 4-1.7
7250 v 4-49.6R7 19.12 D
7 5.72R” -23,40D -1,00N
-1,69680v 5-55.58 8 5 R9~ 2Z20 D 9-3.50 N 6-1.8
4666shi6-23.9RIO-1786,37DIO
-Variable R11--26,10Dll-1,00N 7-1.7
7250 Sheer 49.6R12-47, 89D12-
3.60 N 8-1.76180 v 8-27.
1R□3-170.29 D, 3-Variable R work, -Aperture D14-1.30 R15-ooD15-5.40 N 9-1.6031
1 Sita-60, Fu R□6--2498 D. -0,
10R17-8486Dll-5,00N1o-1,6
0311ylo-60,7R18 vote-6L64 D18
-3.00R19■-26,54Dlo-120N11
-1.80518 C11-25. aR2o--66,
18D2o-0,10R21" 3L67 D21-5
．． 70 N12-1.62299 v12-58.2R
2゜-182fu09 D22-1&88R23-54,
01D23-1.00 N, -1,80518v□3-
25.4R2, -17,02D2. - 1.57R25
-19,68D25” 5.40 N1.-1.517
42 y14-514R26--71240z6-0.
10 Rz7= 34.38 Dz7- &50 N15”1
．． 69680 y15-55.5R28-6o D28
-&00 R2g” ” D29-9.80 N16-1.695
00 ylo-42,230-- Numerical Example 4 F-ILO6~65.51 FNO-1:1.2 ω-
26, f~4.8°R1” 16 & 15 D l-R7
0N 1-18051-8 y □-2+1L4R2”
5&02 D 2-IL40 N 2-160311
y 2-60.7R3-147,73D 3-0.1
0 R4” 46.58 D 4- 7.20 N 3-L
69680y 3-55.5Rs-161-9405
San variable R6-234, 83D 6-LION-L7725
0 y 4-49.6R7-19,6607-6,00 Rs” -2433D B-1,00N 5-1.69
680 v 5-55.5R9-23, 41D 9-3
．． 50 N 6-1.84666 Jiro 23.9R1
o-1297,28Dlo-variable R11--30,21Dll-LOON 7-L772
50v 7-49.6R12” 118.80 D1
2-3.20 N 8-1.84666 v 8-23
．． 9R, 3--50Z28 D13 variable R□4-drawing D, -R30 R15--D15- 5.40 N 9-1.6031
1 v 9-60.7R16■ -26,+,2 D1
6- 0.10R17"' 8 & 18 Dll"" 5
．． 00 N1o-L60311 vlo-60,7R1
8--From 86,88D-&13 R1g--26,49Dlg-1,20N11-L80
518 vll-25,4R2o--49,0902(
, -0,10R21-3L84 D21- 5.70
N12-1.62299 Shi12-58.2R22--
367.84 D22-1&22R2a"" 3490
D23- LOONxa=L80518 C13-2
5.4”24 proverbs 1 & 13 D24- L67R25-
17,65D25-5.40 N14”'155963
14-61.2R26--53&35 D26-0
．． 10R27-35, 05D27-3.56 N□5-
1.69680 ν, 5-55.5R28--Dz8-
3.00 R29”oo D2g-9,80N16-16950
0 y16-4Z2R30″″ Numerical Example 5 F-11,00~65.92 FNO-1:1.2 ω
~26.6"~48°R, -183,35D 1-Z
70 N 1-1.80518ν1-25.4R-56
, 42D 2-1'2. ．． 20 N 2-160311
y 2-60.7R--125,14D 3-0.1
0 R4-4412D 4a-7,00N 3-L6968
0ν3-55.5Rs” 127.57 D 5-Variable R6--439,86D 6-1.00 N 4-L7
7250 Sea-49, 6R7-21, 27D 7-5
．． 72 Rs"-26,69Ds" too N 5-1.
69680ν5-55.5R9-21,62D 9-3
．． 50 N 6-1.84666 6-23.9R10
-21148Dlo--Variable R, l--29,25Dll” 1.00 N 7-1
．． 77250 v 7-49.6R12-69,18D
I2” 2.90 N B-1,84666v 8-2
3.9R□3-2795.66 D, 3-variable R14-
Aperture D14-1.30 R15-"D15-", 40 N 9-1.6031
1 v 9-60.7R□6- -25.50 D□6
-6.1゜R17" 67.01 D, 7-5.00
N1o-1,60311v,o-60,7R,8--7
123D18-3.13 R19”-28,36D19-1.20 N11-1
．． 80518ν11-25.4R2o--58,53D
2o-0,10R21-30,94021-5,70N
12-1.62299shi 12-58.2R22-380
, 89D22 glaze 18.22R23” 4193 D23
-1.00 N13-1.80518 y13-25.
4R24-15, 88024-1,67 R25-1&64 D25-5.40 N14-1.5
5963 Shi14-61.2R26--121,19D
26-0.10R27-36, 24D27" 3.56
N15-1.69680 Shi15-55.5R28-
Flash D28 ceramic 3.00 R29--1D29-9.80 N, 6-1.6950
0 v, 6-4L2R30″″

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

第１１第３、第５、第７、第９図は各々本発明の数値実
施例１〜５のレンズ断面図、第２−Ａ−Ｃ図、第４−Ａ
−Ｃ図、第６−Ａ−Ｃ図、第８−Ａ、Ｃ図、第１０−　
Ａ　、　Ｃ図は各々本発明の数値実施例１〜５の諸収差
図である。 図中Ｉ　、Ｉｔ　、ｌＩ［、Ｍｏ、　ＩＶ２は各々第１
１第２、第３、第４□、第４□レンズ群、６Ｍはメリデ
イオナル像面、ΔＳはサジタル像面である。 項鞄　１　図 第２−ハロ −Ｐ−１０，’ｌ’１ 犯　２−８　図 −Ｉ’＝３２．’１８ 毛ｚ−ｃ　Ｍ 手−６５，０’１ 鴇　３　呪 第４−Ａ図 ４！＝１１．Ｏ’１ 第４−８圓 千−ｓ３．２７ 第　＋−ｃ図 ４’−６５，６ｅｌ 巣５図 第　６−Ａ図 −１”、ｌｏ、’？’１ 第６−８図 −Ｆ−３２，’ｉδ 第　乙−Ｃ口 −Ｆヨ６ｓ、ｏ’を 第　７　図 第８−Ａ図 −Ｐ−１１，０６ 第８−ｅ＞　図 −ｆ’−３３，Ｒ 名ａ−Ｃ図 嶌　９　図 第１０−へ図 キー　＋　１．００ 第１０−８図 手＝３３、Ｏ１11th Figures 3, 5, 7, and 9 are cross-sectional views of lenses of numerical examples 1 to 5 of the present invention, Figures 2-A-C, and 4-A, respectively.
Figure -C, Figure 6-A-C, Figure 8-A, C, Figure 10-
Figures A and C are aberration diagrams of numerical examples 1 to 5 of the present invention, respectively. In the figure, I, It, lI[, Mo, IV2 are the first
1 second, third, fourth □, and fourth □ lens groups, 6M is a meridional image plane, and ΔS is a sagittal image plane. Bag 1 Figure 2-Hello-P-10,'l'1 Criminal 2-8 Figure-I'=32. '18 Hair z-c M Hand-65,0'1 Toki 3 Curse 4-A Figure 4! =11. O'1 No. 4-8 Ensen-s3.27 No. +-c Fig. 4'-65, 6el No. 5 Fig. 6-A Fig. 1'', lo, '?'1 Fig. 6-8 -F- 32,'iδ No. Otsu-C mouth-F Yo6s, o' No. 7 Fig. 8-A Fig. P-11, 06 No. 8-e>Fig.-f'-33, R name a-C Zushima 9 Figure key to Figure 10- + 1.00 Figure 10-8 Hand = 33, O1

Claims (1)

【特許請求の範囲】 物体側よ）順に正の屈折力の７オーカシング用の第ルン
ズ群、負の屈折力の変倍用の第２レンズ群、変倍によシ
変動する像面位置を補正する為の第３レンズ群そして固
定の結像作用をする第４レンズ群の４つのレンズ群を有
するズームレンズにおいて物体側よシ順に前記第４レン
ズ群は正の屈折力の第４□レンズ群と正の屈折力の第４
□レンズ群の２つのレンズ群ヲ有しておシ前記第４□レ
ンズ群は物体側に比べ像面側に強い屈折力を有する正の
屈折力の第４□□レンズ、両レンズ面が凸面の第４１□
レンズ、像面側に凸面を向けた負の屈折力のメニスカス
状の第４□３レンズそして像面側に比べ物体側に強い屈
折力を有する正の屈折力の第４．４レンズを有しており
、前記第４゜レンズ群拡物体側へ凸面を向けた負の屈折
力のメニスカス状の第４□□レンズ、両レンズ面が凸面
の第４□２レンズそして像面側に比べ物体側に強い屈折
力を有する正の屈折力の第４□３レンズを有しており前
記第４レンズ群の物体側から数えて第ｉ番目のレンズ面
の曲率半径をＲｌｖｉ、屈折力をφ９８、第ｉ番目のレ
ンズ厚及び空気間隔をＤＩｖｉ、第ｉ番目のレンズの焦
点距離とガラスのアツベ数ヲ各々ｆ■、　。 νＩｖｉＮ　前記ｇ　４□レンズ群と第４□レンズ群の
焦点距離を各々Ｆ、Ｆ、前記第４□レンズＩＶＩ　ＩＶ
２ 群と第４□レンズ群との主点間隔ｔ　ｅ　Ｎ全系の広角
端のズーム位置での焦点距離ｔ〜とするとき ０．８＜　Ｉｎｆｖ５．／Ｒｔｖｙ　ｌ　（０，９５０
、７５（ｌＲ■１゜／Ｒ■、□ｌ（０，９０Ｚ９　＜　
Ｉｆｙ５／　ＦＷＩ　＜　３．２’１．Ｏ＜　Ｉｆｙ６
／Ｆｗｌ　（ａ５−〇、０２＜φＩＶＢ　ＦＷ　（ｏ、
　０２１、５　（Ｄｙｇ　／ＦＷ　（１，８ ３、０（ａ　／ＦＷ　（＆　６ Ｌ　６　（ＦＷｚ　／　Ｆ■□＜１８ ｚｏ（シ■６／ν■５（１５ なる諸条件を満足することを特徴とする大口径高変倍の
ズームレンズ。[Claims] In order from the object side: a seventh focusing lens group with positive refractive power, a second lens group with negative refractive power for zooming, and a correction for the image plane position that changes due to zooming. In a zoom lens, the fourth lens group has four lens groups: a third lens group to perform a fixed imaging function, and a fourth lens group to perform a fixed imaging function. and the fourth of positive refractive power
□The lens group has two lens groups, and the fourth □ lens group has a positive refractive power that has stronger refractive power on the image side than on the object side, and both lens surfaces are convex. 41st □
The lens has a meniscus-shaped 4th □3 lens with a negative refractive power with its convex surface facing the image side, and a 4.4th lens with a positive refractive power that has a stronger refractive power on the object side than on the image side. The 4th lens group includes a meniscus-shaped 4th lens with negative refractive power with its convex surface facing the magnifying object side, a 4th □2nd lens with both lens surfaces convex, and a lens that is stronger on the object side than on the image side. It has a fourth □ third lens with a positive refractive power, the radius of curvature of the i-th lens surface counting from the object side of the fourth lens group is Rlvi, the refractive power is φ98, and the i-th The lens thickness and air spacing are DIvi, the focal length of the i-th lens and the glass heat index are f■, respectively. νIviN The focal lengths of the g 4□ lens group and the 4th □ lens group are respectively F, F, the 4th □ lens IVI IV
Principal point interval t e N between the 2nd lens group and the 4th □ lens group 0.8< Infv5. /Rtvy l (0,950
, 75(lR■1°/R■, □l(0,90Z9 <
Ify5/ FWI <3.2'1. O＜Ify6
/Fwl (a5-〇, 02<φIVB FW (o,
021,5 (Dyg /FW (1,8 3,0(a /FW (& 6 L 6 (FWz / F■□<18 zo(shi■6/ν■5(15) A zoom lens with a large aperture and high zoom ratio.