JPS6162013A - Zoom lens - Google Patents

Zoom lens

Info

Publication number
JPS6162013A
JPS6162013A JP59184241A JP18424184A JPS6162013A JP S6162013 A JPS6162013 A JP S6162013A JP 59184241 A JP59184241 A JP 59184241A JP 18424184 A JP18424184 A JP 18424184A JP S6162013 A JPS6162013 A JP S6162013A
Authority
JP
Japan
Prior art keywords
lens
positive
negative
object side
lens 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.)
Pending
Application number
JP59184241A
Other languages
Japanese (ja)
Inventor
Satoshi Mogami
聡 最上
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.)
Nikon Corp
Original Assignee
Nippon Kogaku KK
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 Nippon Kogaku KK filed Critical Nippon Kogaku KK
Priority to JP59184241A priority Critical patent/JPS6162013A/en
Publication of JPS6162013A publication Critical patent/JPS6162013A/en
Pending 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
    • G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
    • G02B15/1445—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative
    • G02B15/144511—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative arranged -+-+

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To obtain a zoom lens keeping always stable high performance over the whole power modification range by specifying the constitution of lenses in a lens group having negative refractive power which is arranged on the object side. CONSTITUTION:The zoom lens is formed by a lens group G1 having negative refractive power, a lens group having positive refractive power, a lens group G3 having negative refractive power, and a lens group having positive refractive power which are arranged successively from the object side and power modifica tion is executed by changing the interval between respective lens groups. When it is defined that the radius of curvature of the joint surface of a lens L3 to be an adhered negative lens in the lens group G1 is R6, the refractive indexes of the negative and positive lenses on the object side which constitute the lens L3 are n3 and n4 and the Abbe values of a lens L1 to be a positive lens and a lens L4 to be a positive meniscus lens are nu1, nu4, R6>0, n3/n4>0.99 and nu1>nu4. Consequently, spherical aberration and a difference based upon the color of a curved image surface are reduced and the chromatic aberration of power in the shortest focal distance can be compensated.

Description

【発明の詳細な説明】 （発明の技術分野） 本発明は、最大画角が７４°以上の広画角を含みズーム
比３程度のズームレンズに関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a zoom lens having a wide angle of view with a maximum angle of view of 74° or more and a zoom ratio of about 3.

（発明の背景） 従来、物体側から順に負・正・負・正の４群からなり広
角から準望遠領域までの変倍を可能とするズームレンズ
が知られており、負レンズ群が先行ししていることによ
り特に広画角に有利であるという特徴を有している。し
かしながら、レンズ系を小型に構成しようとすると、望
遠端での絞り開放状態での球面収差の色による差、所謂
球面収差の色収差が大きくなり、また、像面弯曲の色に
よる差も著しくなり、さらに広角端での倍率色収差が大
きくなり、広い波長域にわたって使用される写真用のズ
ームレンズとしては良好な像を得ることが困難であった
。(Background of the Invention) Conventionally, zoom lenses have been known that are comprised of four groups, negative, positive, negative, and positive, in order from the object side, and are capable of varying magnification from a wide-angle to a semi-telephoto range, with the negative lens group leading the lens. This feature makes it especially advantageous for wide angles of view. However, when trying to make a lens system compact, the difference in spherical aberration depending on the color at the telephoto end with the aperture open, the so-called chromatic aberration of spherical aberration, becomes large, and the difference in field curvature depending on the color also becomes significant. Furthermore, the chromatic aberration of magnification at the wide-angle end increases, making it difficult to obtain good images as a photographic zoom lens used over a wide wavelength range.

（発明の目的） 本発明の目的は、最大画角７４°以上という広画角を有
し高い変倍率を有するにもかかわらす、上記の欠点を解
消し、変倍域の全体において常に安定した高性能を維持
し得るズームレンズを提供することにある。(Objective of the Invention) The object of the present invention is to eliminate the above-mentioned drawbacks, and to maintain stability throughout the entire magnification range, despite having a wide field of view of 74° or more and a high magnification ratio. The objective is to provide a zoom lens that maintains high performance.

（発明の概要） 本発明によるズームレンズは、物体側よすＩｌｌに、負
屈折力の第１レンズ群、正屈折力の第２レンズ群、負屈
折力の第３レンズ群及び正屈折力の第４レンズ群を有し
、各群の間隔を変えることによっテ変倍を行うズーム［
メンズにおいて、第１図に示した第１実施例の如く、該
第１レンズ群Ｇ１は、物体側から順に、正レンズの第１
１レンズ１，１、物体側に凸面を向ＢＳＩた負メニスカ
スレンズの第２レンズ１．２、物体側に凸面を向６Ｊだ
接合面を有する貼合わせ負レンズの第３レンズ１，３及
び物体側に凸面を向＆Ｊた正メニスカスレンズの第４レ
ンゲ１，４を有し、該第２レンス群Ｇ２ば貼合わせ正レ
ンズの第５レンズ１７．と正レンズの第６レンス１５．
とを有し、該第３レンス群Ｇ１は物体側６ｊ凹面を向け
た接合面を有する貼合わせレンズの第７レンス１，７と
両凹負レンズの第８レンス１．Ｉ＋を有し、該第４レン
ズ群Ｇ４は、物体側から順に、正レンズの第９レンズ１
，９、両凸正レンズの第１０レンス１，１ｏ及び物体側
に曲率の強い凹面を向げた負レンズの第１１レンズ１，
１１を有するものである。そして、該第１レンズ群Ｇ１
中の貼合わせ負レンズとしての第３レンズ１，３の接合
面の曲率半径をＲ＋、、該貼合わせ負レンズとしての第
３レンズ１６．を構成する物体側の負レンズ及び像側の
正レンズの屈折率をそれぞれｎ＋ｓ　ｎａとし、正レン
ズとしての第１レンズＬ、及び正メニスカスレンズとし
ての第４レンスＬ４のアツベ数をそれぞれν１、ν４と
するとき、 Ｒｂ＞Ｏ（１） ｎ：ｌ　／　ｎａ〉０．９９　　　（２）ν１　〉ν４
　　　　（３） の条件を満足するものである。(Summary of the Invention) The zoom lens according to the present invention has a first lens group with negative refractive power, a second lens group with positive refractive power, a third lens group with negative refractive power, and a third lens group with positive refractive power on the object side Ill. A zoom system that has a fourth lens group and changes the magnification by changing the distance between each group.
For men's lenses, as in the first embodiment shown in FIG. 1, the first lens group G1 includes the first positive lens in order from the object side.
1 lens 1, 1, a second lens 1.2 which is a negative meniscus lens with a BSI convex surface facing the object side, a third lens 1, 3 which is a bonded negative lens with a cemented surface facing 6J and a convex surface facing the object side, and the object. The second lens group G2 includes a fifth lens 17. which is a bonded positive lens. and a positive sixth lens 15.
The third lens group G1 includes seventh lenses 1, 7, which are laminated lenses having a cemented surface facing the object side 6j, and eighth lenses 1, 7, which are biconcave negative lenses. I+, and the fourth lens group G4 includes, in order from the object side, a ninth lens 1 which is a positive lens.
, 9, the 10th lens 1, 1o, which is a biconvex positive lens, and the 11th lens 1, which is a negative lens with a concave surface with a strong curvature facing the object side.
11. Then, the first lens group G1
The radius of curvature of the cemented surface of the third lenses 1 and 3 as the bonded negative lens in the middle is R+, and the third lens 16 as the bonded negative lens. The refractive index of the negative lens on the object side and the positive lens on the image side constituting are respectively n+s na, and the Atsube numbers of the first lens L as a positive lens and the fourth lens L4 as a positive meniscus lens are ν1 and ν4, respectively. When Rb>O(1) n:l/na〉0.99 (2) ν1〉ν4
It satisfies the condition (3).

このように、本発明は、まず第１レンズ群Ｇ、中の接合
面う物体側に凸面を向けた構成とし、この接合面の物体
側の屈折率に対して像側の屈折率は従来かなり大きな値
であったのに対して、この像側の屈折率をできるだけ小
さくすることによって、球面収差及び像面弯曲の色によ
る差を軽減し、次ぎに第１レンズ群Ｇ１中の第１レンズ
としての正レンズのアラへ数を第４レンズとしての正レ
ンズのアラへ数の３倍以上とすることによって、最短焦
点距離状態における倍率の色収差を他の色収差を悪化さ
せることなく補正することを可能としたものである。As described above, the present invention first has a structure in which the cemented surface in the first lens group G has a convex surface facing the object side, and the refractive index on the image side of this cemented surface is conventionally quite large compared to the refractive index on the object side. By reducing the refractive index on the image side as much as possible, the difference in spherical aberration and field curvature due to color can be reduced, and then as the first lens in the first lens group G1. By making the number of edges of the positive lens at least three times the number of edges of the positive lens as the fourth lens, it is possible to correct chromatic aberration of magnification in the shortest focal length state without worsening other chromatic aberrations. That is.

尚、第１図及び第６図に示した実施例のレンズ配置図は
、中間焦点距離における状態を表したものであり、図中
には軸−ヒ無限遠物点からの周縁光線と最大画角の光線
とを示した。The lens arrangement diagrams of the embodiment shown in FIGS. 1 and 6 show the state at an intermediate focal length, and the diagrams also show the peripheral rays from the axis-hi infinity object point and the maximum image. The angular rays were shown.

以下、上記の各条件式について説明する。Each of the above conditional expressions will be explained below.

（１）式及び（２）式の条件は、望遠端での球面収差の
色による差及び像面の色による差を小さくするだめの条
件である。（１）式の条件を外れる場合には、貼合わせ
負レンズの接合面の向きが逆になり、球面収差及び像面
についての色変動が著しくなり良好な性能を維持し得な
くなってしまう。また、接合面を形成する負レンズと正
レンズとの屈折率については、正レンズの屈折率を低く
、負レンズの屈折率をできるだり高（することが好結果
をもたらす。しかし、アラへ数との関係及び高分散低屈
折率の光学材料に限界があることがら、（２）式の条件
のように、所謂ハイパークロマチックに近い状態で構成
することが適切であることが判明した。The conditions of equations (1) and (2) are necessary to reduce the difference in spherical aberration due to color and the difference due to color of the image plane at the telephoto end. If the condition of formula (1) is not met, the direction of the cemented surface of the bonded negative lens will be reversed, and spherical aberration and color fluctuations on the image surface will become significant, making it impossible to maintain good performance. Regarding the refractive index of the negative lens and positive lens that form the cemented surface, it is best to lower the refractive index of the positive lens and increase or increase the refractive index of the negative lens. It has been found that it is appropriate to configure the structure in a state close to so-called hyperchromatic, as in the condition of equation (2), because of the relationship with and the limitations of optical materials with high dispersion and low refractive index.

（３）式の条件は、（１）式の条件による如く第１レン
ズ群Ｇ、中の貼合せ負レンズの接合面の向きを物体側に
凸としたことによる倍率の色収差の補正不足を補い、か
つ画角による倍率の色収差を補正するための条件である
。この条件を外れる場合には、倍率色収差の画角による
差を良好に補正することが不可能となってしまう。The condition of equation (3) compensates for the insufficient correction of chromatic aberration of magnification due to the fact that the cemented surface of the bonded negative lens in the first lens group G is convex toward the object side, as in the condition of equation (1). , and is a condition for correcting chromatic aberration of magnification due to the angle of view. If this condition is not met, it becomes impossible to satisfactorily correct differences in chromatic aberration of magnification depending on the angle of view.

以上の如き本発明の構成において、さらに、」二記第１
レンズから第１１レンズまでの各レンズの屈折力Ｐ１〜
Ｐｌ＋を、全系の最短焦点距離状態における屈折力Ｐに
対して、以下のごとき範囲に設定することが収差補正上
望ましい。In the configuration of the present invention as described above, further,
Refractive power P1 of each lens from the lens to the 11th lens
For aberration correction, it is desirable to set Pl+ within the following range with respect to the refractive power P in the shortest focal length state of the entire system.

−０，０５７＜　　Ｐ、／Ｐ　　＜　　０．０８６　　
　（４）−０，７２＜　　　Ｐ２／Ｐ　　　　〈　−０
，４４（５）−〇。４３　　＜　　Ｐ３／Ｐ　　＜−０
，２９（６）０．２０　　　＜　　　Ｐ４／Ｐ　　　　
＜　　　０．２４　　　　　　　（７）０．４０　　＜
　　Ｐ５／Ｐ　　＜　　０．５０　　　　（８）０．４
６　　＜　　Ｐ６／Ｐ　　＜　　０．５８　　　　（９
）−０，０２８＜　　Ｐ、／Ｐ　　＜　　０．２１　　
　　（１０）−０，９６＜　　　Ｐ、／Ｐ　　　　＜−
０，６３（ｌｉ）０．４９　　　＜　　　Ｐ９／Ｐ　　
　　＜　　　０．６４　　　　　　　（１２）０．４３
　　　＜　　　ＰＩｏ　／Ｐ　　　　＜　　　０．５２
　　　　　（１３）−０，８１＜　　１１．、　　／ｌ
）　　　＜　−０，５７（＋４）（実施例） 以下、本発明による実施例について説明する。−0,057<P, /P<0.086
(4) −0,72< P2/P < −0
, 44(5)-〇. 43 < P3/P <-0
,29(6)0.20<P4/P
< 0.24 (7) 0.40 <
P5/P < 0.50 (8) 0.4
6 < P6/P < 0.58 (9
)−0,028<P,/P<0.21
(10) −0,96<P, /P<−
0.63 (li) 0.49 < P9/P
< 0.64 (12) 0.43
<PIo/P<0.52
(13)-0,81<11. , /l
) < −0,57(+4) (Example) Examples according to the present invention will be described below.

本発明による第１実施例、第２実施例、第３実施例及び
第４実施例は、いずれも第１図のレンズ配置図に示した
ごとき構成を有しており、３５ｍｍ−眼レフレックスカ
メラ用のズームレンズとして、焦点距離が２Ｆ１ｍｍ〜
８５ｍｍで、Ｆ−ノ・ンハーが３．５〜４．５を有する
ものである。下表に第１実施例〜第４実施例の諸元を示
す。表中、左端の数字は物体側からの順序を表し、屈折
率ｎ及びアッベ数νはｄ線第１実施例 焦点距離ｆ　＝　２８．８３３〜８３．２８８Ｆナンバ
ー　　３．５〜４．５ 第１実施例（続き） Ｐ、−０，ＯＱ２７７ Ｐｇ−０，０２０６６ Ｐ３　　＝−０，０１１９５ Ｐ４．　　＝　　０．０２４４７ Ｐｓ　　＝　　０．０１４１５ ｐｂ　　＝　　０．０１９４３ Ｐ７　　＝−０，００２４５ ｐｅ　　−−（１，０２７８７ Ｐ　　＝　　０．０３４６８ 第２実施例 焦点距離ｆ　＝　２８．８３３〜８３．２８８Ｆナンバ
ー　　３．５〜４．５ 第２実施例（続き） Ｐ　　＝　　０．０３４６８ 第３実施例 焦点距離ｆ　＝　２８．８３３〜８３．２８８Ｆナンバ
ー　　３．５〜４．５ 第３実施例（続き） Ｐ４．　　＝　　０．０（レンズ８ ｐ５＝　　０．０１６２４ Ｐ、　　＝　　０．０１７２３ Ｐ７＝−０，００５６２ Ｐ、　　＝０．０３１２２ Ｐ１＋　＝　　０．０２２６２ Ｐ　　＝　　０．０３４６８ 第４実施例 焦点距離ｆ　＝　２８．８３３〜８３．２８８Ｆナンバ
ー　　３．５〜４．５ 第４実施例（続き） Ｐ４＝　　０．００７１２ Ｐ５＝　　０．０１４１’５ Ｐ６＝　　０．０１９４４ ｐ、　　＝−０，００２４５ ｐ、　　＝−０，０２７８７ １’、、　−−０，０２２２７ Ｐ　　　＝　　　０．０３４６８ 上記第１、第２、第３及び第４実施例の諸収差図をそれ
ぞれ順に、第２図、第３図、第４図及び第５図に示す。The first, second, third, and fourth embodiments of the present invention all have the configuration shown in the lens arrangement diagram in FIG. As a zoom lens for
It is 85 mm and has an F-number of 3.5 to 4.5. The table below shows the specifications of the first to fourth embodiments. In the table, the leftmost number represents the order from the object side, and the refractive index n and Abbe number ν are d-line 1st example focal length f = 28.833-83.288F number 3.5-4.5 1st Examples (continued) P, -0,OQ277 Pg-0,02066 P3 = -0,01195 P4. = 0.02447 Ps = 0.01415 pb = 0.01943 P7 = -0,00245 pe --(1,02787 P = 0.03468 Second embodiment focal length f = 28.833 to 83.288 F number 3. 5-4.5 Second Example (Continued) P = 0.03468 Third Example Focal Length f = 28.833-83.288 F Number 3.5-4.5 Third Example (Continued) P4. = 0.0 (lens 8 p5 = 0.01624 P, = 0.01723 P7 = -0,00562 P, = 0.03122 P1+ = 0.02262 P = 0.03468 4th example focal length f = 28.833 ~83.288F number 3.5~4.5 4th example (continued) P4 = 0.00712 P5 = 0.0141'5 P6 = 0.01944 p, =-0,00245 p, =-0,02787 1',, --0,02227 P = 0.03468 The various aberration diagrams of the first, second, third, and fourth embodiments are shown in order as Fig. 2, Fig. 3, Fig. 4, and Fig. 5. As shown in the figure.

各収差図において、（Ａ）は最短焦点距離状態、（Ｂ）
は中間焦点距離状態、（Ｃ）は最長焦点距離状態を表す
。収差図には、基準波長としてのｄ線（λ＝５８７．６
ｎｍ）を示し、倍率の色収差は基準波長としてのｄ線に
対するｇ線（λ−４３５，８ｎｍ）の状態を示した。ま
た、球面収差及び非点収差には、色収差の状態を表すた
めにｇ綿をも併記した。In each aberration diagram, (A) is the shortest focal length state, (B)
(C) represents the intermediate focal length state, and (C) represents the longest focal length state. The aberration diagram shows the d-line (λ=587.6
The chromatic aberration of magnification showed the state of the g-line (λ-435, 8 nm) with respect to the d-line as a reference wavelength. In addition, g is also written for spherical aberration and astigmatism to represent the state of chromatic aberration.

各収差図より、何れの実施例も各焦点距離状態において
常に優れた結像性能を有していることが分かる。From each aberration diagram, it can be seen that all examples always have excellent imaging performance in each focal length state.

（発明の効果） 以上の如く、本発明によれば、最大画角７４°という広
画角を有し、準望遠までの広い変倍領域を持ちつつも、
変倍域の全体において常に安定した高性能を維持し得る
ズームレンズが達成される。(Effects of the Invention) As described above, according to the present invention, although it has a wide angle of view of 74° at the maximum and a wide variable magnification range up to semi-telephoto,
A zoom lens that can always maintain stable high performance over the entire zoom range is achieved.

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

第１図は本発明による第１、第２、第３及び第４実施例
の中間焦点距離状態におけるレンズ配置図、第２図、第
３図、第４図及び第５図はそれぞれ第１、第２、第１、
第４実施例の収差図であり、各収差図における（Ａ）は
最短焦点距離状態、（’Ｂ）は中間焦点距離状態、（Ｃ
）は最長焦点距離状態を表す。 〔主要部分の符号の説明〕 Ｇ、・・・第１レンズ群 Ｇ２・・・第２レンズ群 Ｇ３・・・第３レンズ群 Ｇ４・・・第４レンズ群FIG. 1 is a lens arrangement diagram of the first, second, third and fourth embodiments according to the present invention in an intermediate focal length state, and FIGS. 2nd, 1st,
It is an aberration diagram of the fourth example, and in each aberration diagram, (A) is the shortest focal length state, ('B) is the intermediate focal length state, and (C
) represents the longest focal length state. [Explanation of symbols of main parts] G,...First lens group G2...Second lens group G3...Third lens group G4...Fourth lens group

Claims (1)

【特許請求の範囲】 物体側より順に、負屈折力の第１レンズ群、正屈折力の
第２レンズ群、負屈折力の第３レンズ群及び正屈折力の
第４レンズ群を有し、各群の間隔を変えることによって
変倍を行うズームレンズにおいて、該第１レンズ群は、
物体側から順に、正レンズの第１レンズ、物体側に凸面
を向けた負メニスカスレンズの第２レンズ、物体側に凸
面を向けた接合面を有する貼合わせ負レンズの第３レン
ズ及び物体側に凸面を向けた正メニスカスレンズの第４
レンズを有し、該第２レンズ群は貼合わせ正レンズの第
５レンズと正レンズの第６レンズとを有し、該第３レン
ズ群は物体側に凹面を向けた接合面を有する貼合わせレ
ンズの第７レンズと両凹負レンズの第８レンズを有し、
該第４レンズ群は、物体側から順に、正レンズの第９レ
ンズ、両凸正レンズの第１０レンズ及び物体側に曲率の
強い凹面を向けた負レンズの第１１レンズを有し、該第
１レンズ群中の貼合わせ負レンズとしての第３レンズの
接合面の曲率半径をＲ＿６、該貼合わせ負レンズとして
の第３レンズを構成する物体側の負レンズ及び像側の正
レンズの屈折率をそれぞれｎ＿３、ｎ＿４とし、該正レ
ンズとしての第１レンズ及び正メニスカスレンズとして
の第４レンズのアッベ数をそれぞれν＿１、ν＿４とす
るとき、 Ｒ＿６＞０　（１） ｎ＿３／ｎ＿４＞０．９９　（２） ν＿１＞ν＿４　（３） の条件を満足することを特徴とするズームレンズ。[Scope of Claims] In order from the object side, it has a first lens group with negative refractive power, a second lens group with positive refractive power, a third lens group with negative refractive power, and a fourth lens group with positive refractive power, In a zoom lens that changes magnification by changing the interval between each group, the first lens group is
In order from the object side, the first lens is a positive lens, the second lens is a negative meniscus lens with a convex surface facing the object side, the third lens is a bonded negative lens having a cemented surface with a convex surface facing the object side, and the third lens is a negative meniscus lens with a cemented surface facing the object side. The fourth positive meniscus lens with the convex surface facing
The second lens group includes a fifth lens that is a bonded positive lens and a sixth lens that is a positive lens, and the third lens group is a bonded lens that has a cemented surface with a concave surface facing the object side. It has a seventh lens of the lens and an eighth lens of a biconcave negative lens,
The fourth lens group includes, in order from the object side, a ninth lens that is a positive lens, a tenth lens that is a biconvex positive lens, and an eleventh lens that is a negative lens that has a concave surface with a strong curvature facing the object side. The radius of curvature of the cemented surface of the third lens as a bonded negative lens in one lens group is R_6, and the refractive index of the object side negative lens and image side positive lens that constitute the third lens as the bonded negative lens are n_3 and n_4, respectively, and the Abbe numbers of the first lens as the positive lens and the fourth lens as the positive meniscus lens are ν_1 and ν_4, respectively, R_6>0 (1) n_3/n_4>0.99 ( 2) A zoom lens characterized by satisfying the following condition: ν_1>ν_4 (3).
JP59184241A 1984-09-03 1984-09-03 Zoom lens Pending JPS6162013A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59184241A JPS6162013A (en) 1984-09-03 1984-09-03 Zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59184241A JPS6162013A (en) 1984-09-03 1984-09-03 Zoom lens

Publications (1)

Publication Number Publication Date
JPS6162013A true JPS6162013A (en) 1986-03-29

Family

ID=16149848

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59184241A Pending JPS6162013A (en) 1984-09-03 1984-09-03 Zoom lens

Country Status (1)

Country Link
JP (1) JPS6162013A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002287031A (en) * 2001-03-23 2002-10-03 Canon Inc Zoom lens and optical equipment using the same
US7075730B2 (en) 2004-06-25 2006-07-11 Canon Kabushiki Kaisha Zoom lens system and image pickup apparatus including the same
US7102829B2 (en) 2003-09-19 2006-09-05 Canon Kabushiki Kaisha Zoom lens system and image pickup device having zoom lens system
WO2013027362A1 (en) * 2011-08-25 2013-02-28 パナソニック株式会社 Zoom lens system, interchangeable lens device, and camera system
CN110456482A (en) * 2019-08-19 2019-11-15 嘉兴中润光学科技有限公司 Ultra-wide angle interchangeable tight shot

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002287031A (en) * 2001-03-23 2002-10-03 Canon Inc Zoom lens and optical equipment using the same
US7102829B2 (en) 2003-09-19 2006-09-05 Canon Kabushiki Kaisha Zoom lens system and image pickup device having zoom lens system
US7196852B2 (en) 2003-09-19 2007-03-27 Canon Kabushiki Kaisha Zoom lens system and image pickup device having zoom lens system
US7075730B2 (en) 2004-06-25 2006-07-11 Canon Kabushiki Kaisha Zoom lens system and image pickup apparatus including the same
WO2013027362A1 (en) * 2011-08-25 2013-02-28 パナソニック株式会社 Zoom lens system, interchangeable lens device, and camera system
CN110456482A (en) * 2019-08-19 2019-11-15 嘉兴中润光学科技有限公司 Ultra-wide angle interchangeable tight shot

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