JP2811828B2 - Zoom lens having simple configuration and camera having the same - Google Patents
Zoom lens having simple configuration and camera having the sameInfo
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- JP2811828B2 JP2811828B2 JP1299173A JP29917389A JP2811828B2 JP 2811828 B2 JP2811828 B2 JP 2811828B2 JP 1299173 A JP1299173 A JP 1299173A JP 29917389 A JP29917389 A JP 29917389A JP 2811828 B2 JP2811828 B2 JP 2811828B2
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- zoom
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Description
【発明の詳細な説明】 (産業上の利用分野) 本発明はレンズシャッターカメラ、ビデオカメラ等に
好適な2つのレンズ群より成る簡易な構成のズームレン
ズ及びそれを有したカメラに関し、特に各レンズ群のレ
ンズ枚数を極めて少なくすると共に収差補正を良好に行
ったレンズ全長(第1レンズ面から像面までの距離)の
短い簡易な構成のズームレンズ及びそれを有したカメラ
に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens having a simple configuration including two lens groups suitable for a lens shutter camera, a video camera, and the like, and a camera having the same, and in particular, to each lens. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens having a simple structure and a short overall lens length (distance from a first lens surface to an image plane), in which the number of lenses in a group is extremely reduced and aberration correction is performed satisfactorily, and a camera having the zoom lens.
(従来の技術) 従来よりレンズシャッターカメラ、ビデオカメラ等の
小型化に伴いレンズ全長の短い簡易な構成のズームレン
ズが種々と提案されている。(Prior Art) Conventionally, various zoom lenses having a short overall length have been proposed as the size of lens shutter cameras, video cameras and the like becomes smaller.
本出願人は先に特開昭57−201213号公報、特開昭60−
170816号公報、特開昭60−191216号公報、特開昭62−56
917公報等において、物体側より順に正の屈折力の第1
群と負の屈折力の第2群の2つのレンズ群で構成し、両
レンズ群の間隔を変えて変倍する小型のズームレンズを
提案した。The present applicant has previously disclosed JP-A-57-201213 and JP-A-60-201213.
No. 170816, JP-A-60-191216, JP-A-62-56
In the 917 publication, etc., the first positive refractive power from the object side
We have proposed a small zoom lens that consists of two lens groups, a group and a second group with a negative refractive power, and changes the magnification by changing the distance between both lens groups.
同公報においては物体側より順に正、負の屈折力配置
を採用し、バックフォーカスを比較的短くし、しかもレ
ンズ全長の短縮化を図った高い光学性能を有したズーム
レンズを達成している。In this publication, a positive / negative refractive power arrangement is adopted in order from the object side to achieve a zoom lens having a high optical performance with a relatively short back focus and a short overall lens length.
この他、正の屈折力の第1群と負の屈折力の第2群よ
り成り、双方のレンズ間隔を変えて変倍を行うズームレ
ンズが例えば特開昭62−251710号公報で提案されてい
る。同公報では第1群を3つのレンズより成るトリプレ
ット型より成り、第2群を正レンズと負レンズの2つの
レンズより成り、全体として5つのレンズより成る変倍
比1.5程度の簡易な構成のズームレンズを提案してい
る。In addition, a zoom lens comprising a first group having a positive refractive power and a second group having a negative refractive power and performing zooming by changing the distance between both lenses has been proposed in, for example, JP-A-62-251710. I have. In this publication, the first group is composed of a triplet type composed of three lenses, the second group is composed of two lenses of a positive lens and a negative lens, and has a simple configuration with a total zoom ratio of about 1.5 composed of five lenses. A zoom lens is proposed.
又、特開昭63−276013号公報では第1群を負レンズと
正レンズの2つのレンズより成り、第2群を正レンズと
負レンズの2つのレンズより成り、全体として4つのレ
ンズより成ると共にこのうちの複数のレンズに屈折率分
布型レンズを用いた変倍比2程度の簡易な構成のズーム
レンズを提案している。In Japanese Patent Application Laid-Open No. 63-276013, the first group is composed of two lenses, a negative lens and a positive lens, and the second group is composed of two lenses, a positive lens and a negative lens. In addition, a zoom lens having a simple configuration with a zoom ratio of about 2 using a gradient index lens for a plurality of lenses has been proposed.
(発明が解決しようとする問題点) 一般に前述した2つのレンズ群より成るズームレンズ
において、レンズ構成の簡素化を図るには各レンズ群を
なるべく少ないレンズ枚数で構成するのが良い。(Problems to be Solved by the Invention) In general, in a zoom lens composed of the two lens groups described above, in order to simplify the lens configuration, it is preferable to configure each lens group with as few lenses as possible.
しかしながら所定の変倍比や撮影画角を確保するには
各レンズ群のレンズ構成を適切に設定しないて変倍に伴
う諸収差の変動が増大し、これらを良好に補正するのが
難しくなってくる。However, in order to secure a predetermined zoom ratio and a shooting angle of view, the lens configuration of each lens group is not appropriately set, and fluctuations of various aberrations due to zooming increase, making it difficult to satisfactorily correct these. come.
又、前述した特開昭63−276013号公報で提案されてい
るように屈折率分布型レンズを用いてレンズ構成の簡素
化を図る方法は屈折率分布型レンズを精度良く製作する
のが難しいという問題点がある。Also, as proposed in the above-mentioned Japanese Patent Application Laid-Open No. 63-276013, the method of simplifying the lens configuration using the gradient index lens is said to make it difficult to accurately manufacture the gradient index lens. There is a problem.
本発明は2つのレンズ群を有するズームレンズにおい
て通常の均一の材質より成るレンズを用い各レンズ群の
レンズ構成を適切に設定することにより、所定の変倍比
と撮影画角を有しつつ、レンズ構成の簡素化を図った全
変倍範囲にわたり良好なる光学性能を有した簡易な構成
のズームレンズ及びそれを有したカメラの提供を目的と
する。The present invention is a zoom lens having two lens groups, using a lens made of a normal uniform material and appropriately setting the lens configuration of each lens group, while having a predetermined zoom ratio and a shooting angle of view, It is an object of the present invention to provide a zoom lens having a simple configuration having good optical performance over the entire zoom range in which the lens configuration is simplified and a camera having the same.
(問題点を解決するための手段) (1−1)本発明の簡易な構成のズームレンズは、物
体側より順に正の屈折力の第1群と負の屈折力の第2群
の2つのレンズ群を有し、双方のレンズ群の間隔を変え
て変倍を行う際、該第1群を物体側に凸面を向けたメニ
スカス状の負の第11レンズと両レンズ面が凸面の正の第
12レンズより構成し、該第2群を正の第21レンズと負の
第22レンズより構成し、該第1群と第2群の焦点距離を
各々F1,F2、該第11レンズと第12レンズの材質のアッベ
数を各々ν11,ν12、全系の広角端における焦点距離をF
W、該第11レンズと第12レンズの材質の屈折率を各々n1
1,n12とするとき 0.4< F1/FW < 1.2 ・・・(1) −1.5< F2/FW <−1.5 ・・・(2) ν11<40 ・・・(3) 50<ν12 ・・・(4) 1.56< n11 <1.65 ・・・(6) n12< 1.52 ・・・(7) なる条件を満足することを特徴としている。(Means for Solving the Problems) (1-1) The zoom lens having a simple configuration according to the present invention includes, in order from the object side, a first lens unit having a positive refractive power and a second lens unit having a negative refractive power. When performing zooming by changing the distance between both lens groups, the first group has a meniscus negative eleventh lens with the convex surface facing the object side, and both lens surfaces have a positive convex surface. No.
The second group is composed of a positive twenty-first lens and a negative twenty-second lens. The focal lengths of the first and second groups are F1 and F2, respectively. The Abbe numbers of the lens materials are ν11 and ν12, respectively, and the focal length at the wide-angle end of the entire system is F
W, the refractive index of the material of the eleventh lens and the twelfth lens is n1
0.4 <F1 / FW <1.2 (1) -1.5 <F2 / FW <-1.5 (2) ν11 <40 (3) 50 <ν12 (1) 4) 1.56 <n11 <1.65 (6) n12 <1.52 (7) The following condition is satisfied.
(1−2)本発明の簡易な構成のズームレンズを有し
たカメラは、物体側より順に正の屈折力の第1群と負の
屈折力の第2群の2つのレンズ群を有し、双方のレンズ
群の間隔を変えて変倍を行う際、該第1群を物体側に凸
面を向けたメニスカス状の負の第11レンズと両レンズ面
が凸面の正の第12レンズより構成し、該第2群を正の第
21レンズと負の第22レンズより構成し、該第1群と第2
群の焦点距離を各々F1,F2、該第11レンズと第12レンズ
の材質のアッベ数を各々ν11,ν12、全系の広角端にお
ける焦点距離をFW、該第11レンズと第12レンズの材質の
屈折率を各々n11,n12、該第11レンズの物体側又は像面
側には非球面が施されており、該非球面の4次の非球面
係数をB、有効画面の対角線長をYとしたとき 0.4< F1/FW < 1.2 ・・・(1) −1.5< F2/FW <−1.5 ・・・(2) ν11<40 ・・・(3) 50<ν12 ・・・(4) 1.56< n11 <1.65 ・・・(6) n12< 1.52 ・・・(7) 1<|B・Y3|<15 ・・・(9) なる条件を満足することを特徴としている。(1-2) A camera having a zoom lens having a simple configuration according to the present invention includes, in order from the object side, a first lens unit having a positive refractive power and a second lens unit having a negative refractive power. When zooming is performed by changing the distance between both lens groups, the first group is composed of a meniscus negative eleventh lens with a convex surface facing the object side and a positive twelfth lens with both lens surfaces convex. , The second group
The first lens unit and the second lens unit comprise a 21st lens and a negative 22nd lens.
The focal length of the group is F1, F2, the Abbe number of the material of the eleventh lens and the twelfth lens is ν11, ν12, the focal length at the wide angle end of the entire system is FW, the material of the eleventh lens and the twelfth lens. N11, n12, an aspherical surface is provided on the object side or the image surface side of the eleventh lens, the fourth order aspherical coefficient of the aspherical surface is B, and the diagonal length of the effective screen is Y. 0.4 <F1 / FW <1.2 (1) -1.5 <F2 / FW <-1.5 (2) ν11 <40 (3) 50 <ν12 (4) 1.56 < n11 <1.65 (6) n12 <1.52 (7) 1 <| B · Y 3 | <15 (9)
(実施例) 第1図,第2図は本発明の数値実施例1,2のレンズ断
面図である。同図において(A)は広角端、(B)は中
間、(C)は、望遠端のズーム位置を示している。(Example) FIGS. 1 and 2 are lens cross-sectional views of Numerical Examples 1 and 2 of the present invention. In the figure, (A) shows the zoom position at the wide angle end, (B) shows the middle position, and (C) shows the zoom position at the telephoto end.
図中、Iは正の屈折力の第1群、IIは負の屈折力の第
2群であり、両レンズ群の間隔を減少させつつ、両レン
ズ群を矢印の如く物体側へ移動させて広角端から望遠端
への変倍を行っている。SPは絞りである。In the figure, I is a first group having a positive refractive power, and II is a second group having a negative refractive power. By moving both lens groups toward the object side as indicated by arrows while reducing the distance between the two lens groups. Zooming is performed from the wide-angle end to the telephoto end. SP is the aperture.
本実施例ではこのようなズーム方式及び屈折力配置を
採ることにより、レンズ全長の短縮化、特に広角端での
レンズ全長の短縮化を図っている。そして各レンズ群の
レンズ構成、及び各レンズ群のレンズ形状等を前述の如
く構成し、変倍に際してレンズ系全体が対称型の配置と
なるようにし、これにより変倍比2程度、撮影画各62゜
〜35゜程度の全変倍範囲にわたり良好なる光学性能を有
したレンズ枚数が第1群が2枚、第2群が2枚の全体と
して4枚より成る簡易な構成のズームレンズを得てい
る。In the present embodiment, the overall length of the lens is shortened, particularly the overall length of the lens at the wide-angle end, by employing such a zoom system and refractive power arrangement. Then, the lens configuration of each lens group, the lens shape of each lens group, and the like are configured as described above so that the entire lens system has a symmetrical arrangement at the time of zooming. A zoom lens having a simple configuration in which the first group has two lenses and the second group has two lenses having a total of four lenses having good optical performance over the entire zoom range of about 62 to 35 degrees. ing.
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 described.
条件式(1)は第1群の屈折力に関し、又条件式
(2)は第2群の屈折力に関し、条件式(1),(2)
は双方のレンズ群を移動させて変倍を行うときレンズ系
全体の小型化を図りつつ、所定の変倍比を確保しつつ収
差変動を少なくする為のものである。Conditional expression (1) relates to the refractive power of the first lens unit, and conditional expression (2) relates to the refractive power of the second lens unit. Conditional expressions (1) and (2)
When the zooming is performed by moving both lens groups, the size of the entire lens system is reduced, and the variation in aberration is reduced while a predetermined zooming ratio is secured.
条件式(1)の下限値又は条件式(2)の上限値を超
えて各レンズ群の屈折力が強くなりすぎると、所定の変
倍比は容易に得られるが、全変倍範囲にわたり像面弯曲
とコマ収差を良好に補正するのが難しくなってくる。If the refractive power of each lens unit becomes too strong beyond the lower limit value of conditional expression (1) or the upper limit value of conditional expression (2), a predetermined zoom ratio can be easily obtained. It becomes difficult to satisfactorily correct curvature and coma.
条件式(1)の上限値又は条件式(2)の下限値を超
えて各レンズ群の屈折力が弱くなりすぎるとバックフォ
ーカスが短くなりすぎ、又第2群の有効径が増大してく
る。又所定の変倍比を確保する為の各レンズ群の移動量
が増大し、レンズ全長が長くなってくるので良くない。If the upper limit of conditional expression (1) or the lower limit of conditional expression (2) is exceeded and the refractive power of each lens unit becomes too weak, the back focus becomes too short, and the effective diameter of the second unit increases. . In addition, the amount of movement of each lens unit for securing a predetermined zoom ratio increases, and the overall length of the lens becomes longer.
条件式(3),(4)は第1群を均一の材質より成る
物体側に凸面を向けたメニスカス状の負の第11レンズと
両レンズ面が凸面の正の第12レンズで構成したときの双
方のレンズの材質のアッベ数を適切に設定し、主に軸上
色収差を良好に補正する為のものである。Conditional expressions (3) and (4) are satisfied when the first lens unit is composed of a negative meniscus eleventh lens having a convex surface facing the object side and a positive twelfth lens having both convex surfaces. The purpose is to appropriately set the Abbe number of the material of both lenses to favorably correct axial chromatic aberration.
条件式(3),(4)を外れると変倍に伴う軸上色収
差の変動が大きくなってくるので良くない。If conditional expressions (3) and (4) are not satisfied, the fluctuation of the axial chromatic aberration accompanying zooming becomes large, which is not good.
条件式(6),(7)は、第11レンズ第12レンズの材
質の屈折率に関し、条件式(6),(7)を外れるとペ
ッツバール和が増大し、又非点収差も増大してくるので
良くない。The conditional expressions (6) and (7) relate to the refractive index of the material of the eleventh lens and the twelfth lens. If the conditional expressions (6) and (7) are not satisfied, the Petzval sum increases and the astigmatism also increases. Not good because it comes.
条件式(9)は簡易な構成のズームレンズを有するカ
メラにおいて全変倍範囲にわたり画面全体の光学性能を
良好に維持する為のものである。具体的には、第1群中
の第11レンズの物体側又は像面側にレンズ中心部から周
辺部にいくに従い負の屈折力が強くなる形状の非球面が
施すのが良い。Conditional expression (9) is for maintaining good optical performance of the entire screen over the entire zoom range in a camera having a simple configuration of a zoom lens. Specifically, it is preferable to provide an aspherical surface on the object side or image plane side of the eleventh lens in the first group, the shape of which has a shape in which the negative refractive power increases from the center to the periphery of the lens.
条件式(9)において非球面を第11レンズの物体側の
レンズ面に施すときは非球面係数Bは負符号、像面側の
レンズ面に施すときは非球面係数Bは正符号となる。In the conditional expression (9), when the aspherical surface is applied to the object-side lens surface of the eleventh lens, the aspherical surface coefficient B has a negative sign, and when it is applied to the image-side lens surface, the aspherical surface coefficient B has a positive sign.
条件式(9)の上限値を超えると非球面効果が不足
し、像面弯曲を良好に補正するのが難しくなり、又下限
値を超えると非球面効果が強くなり過ぎ、像面弯曲が補
正過剰となってくるので良くない。If the upper limit of conditional expression (9) is exceeded, the aspherical effect will be insufficient and it will be difficult to satisfactorily correct the curvature of field. If the lower limit is exceeded, the aspherical effect will be too strong and the curvature of field will be corrected. It is not good because it becomes excessive.
又、本発明においてレンズ全長の短縮化を図りつつ、
所定の変倍比を容易に得るには第1群と第2群の広角端
と望遠端における主点間隔を各々eW,eTとしとき、 1.7<eW/eT<2.7 ・・・(5) なる条件を満足するのが良い。In the present invention, while reducing the overall length of the lens,
In order to easily obtain a predetermined zoom ratio, when the principal point intervals at the wide-angle end and the telephoto end of the first and second units are eW and eT, respectively, 1.7 <eW / eT <2.7 (5) It is better to satisfy the conditions.
条件式(5)は第1群と第2群の広角端と望遠端にお
ける主点間隔を適切に設定し、条件式(1),(2)の
基でレンズ全長の短縮化を図りつつ所定の変倍比、例え
ば変倍比2程度を得る為のものである。Conditional expression (5) sets the distance between the principal points of the first lens unit and the second lens unit at the wide-angle end and the telephoto end appropriately, and reduces the total length of the lens based on the conditional expressions (1) and (2). , For example, to obtain a zoom ratio of about 2.
条件式(5)の上限値又は下限値を超えるとレンズ全
長の短縮化を図りつつ所定の変倍比を得るのが難しくな
ってくる。If the upper limit or the lower limit of conditional expression (5) is exceeded, it becomes difficult to obtain a predetermined zoom ratio while shortening the overall length of the lens.
この他本発明において収差補正上特に好ましくは負の
屈折力の第2群を構成する第22レンズの物体側と像面側
のレンズ面の曲率半径を各々RA,RBとしたとき なる条件を満足させるのが良い。In addition, in the present invention, it is particularly preferable in terms of aberration correction that the radius of curvature of the object-side and image-surface-side lens surfaces of the 22nd lens constituting the second group having a negative refractive power is RA and RB, respectively. It is better to satisfy the following conditions.
条件式(8)は全変倍にわたり画面全体の諸収差をバ
ランス良く補正する為のものであり、上限値又は下限値
を超えても画面全体の光学性能をバランス良く維持する
のが難しくなってくる。Conditional expression (8) is for correcting various aberrations of the entire screen in a well-balanced manner over the entire zooming, and it becomes difficult to maintain the optical performance of the entire screen in a well-balanced state even if the upper limit or the lower limit is exceeded. come.
尚、後述する数値実施例1,2では第11レンズをプラス
チックより成る非球面レンズより構成し、像面弯曲を良
好に補正したズームレンズを得ている。In Numerical Examples 1 and 2, which will be described later, the eleventh lens is formed of an aspherical lens made of plastic, and a zoom lens in which the curvature of field is well corrected is obtained.
この他本発明において、特にレンズ系全体の小型化を
図りつつ諸収差をバランス良く補正する為には前述の条
件式(1)〜(4)を 0.6< F1/FW < 1.2 −1.3< F2/FW <−0.7 ν11<38 50<ν12 の如く設定するのが良い。In addition, in the present invention, in order to correct various aberrations in a well-balanced manner, particularly while miniaturizing the entire lens system, the above-mentioned conditional expressions (1) to (4) must be set to 0.6 <F1 / FW <1.2-1.3 <F2 / It is better to set as FW <−0.7 ν11 <3850 <ν12.
次に本発明の数値実施例を示す。数値実施例において
Riは物体側より順に第i番目のレンズ面の曲率半径、Di
は物体側より第i番目のレンズ厚及び空気間隔、Niとν
iは各々物体側より順に第i番目のレンズのガラスの屈
折率とアッベ数である。Next, numerical examples of the present invention will be described. In numerical examples
Ri is the radius of curvature of the i-th lens surface in order from the object side,
Is the i-th lens thickness and air gap from the object side, Ni and ν
i is the refractive index and Abbe number of the glass of the i-th lens in order from the object side.
非球面形状は光軸方向にX軸、光軸と垂直方向にH
軸、光の進行方向を正としRを近軸曲率半径、A,B,C,D,
Eを各々非球面係数としたとき なる式で表わしている。The aspheric surface has an X-axis in the optical axis direction and H in the direction perpendicular to the optical axis.
R and paraxial radius of curvature, A, B, C, D,
When E is each aspheric coefficient It is represented by the following equation.
又、前述の各条件式と数値実施例における諸数値との
関係を表−1に示す。Table 1 shows the relationship between the above-described conditional expressions and various numerical values in the numerical examples.
(発明の効果) 本発明によれば所定の屈折力の2つのレンズ群を移動
させて変倍を行うズームレンズの各レンズ群のレンズ形
状、屈折力等を前述の如く設定することにより、レンズ
全長の短縮化を図った変倍比2程度の全変倍範囲にわた
り高い光学性能を有した全体として4つのレンズより成
る簡易な構成のズームレンズ及びそれを有したカメラを
達成することができる。 (Effects of the Invention) According to the present invention, the lens shape, the refractive power, and the like of each lens group of a zoom lens that performs zooming by moving two lens groups having a predetermined refractive power are set as described above. It is possible to achieve a zoom lens having a simple configuration including four lenses as a whole and having a high optical performance over the entire zoom range of about 2 in which the overall length is reduced, and a camera having the same.
第1図,第2図は本発明の数値実施例1,2のレンズ断面
図、第3図,第4図は本発明の数値実施例1,2の諸収差
図である。レンズ断面図と収差図において(A)は広角
端、(B)は中間、(C)は望遠端の収差図である。 図中、I,IIは各々第1,第2レンズ群、SPは絞り、矢印は
変倍の際の各群の移動方向を示す。1 and 2 are lens sectional views of Numerical Examples 1 and 2 of the present invention, and FIGS. 3 and 4 are various aberration diagrams of Numerical Examples 1 and 2 of the present invention. In the lens cross-sectional view and the aberration diagram, (A) is an aberration diagram at a wide-angle end, (B) is an intermediate diagram, and (C) is an aberration diagram at a telephoto end. In the figure, I and II denote the first and second lens groups, SP denotes the aperture, and arrows denote the moving directions of the respective groups during zooming.
Claims (4)
屈折力の第2群の2つのレンズ群を有し、双方のレンズ
群の間隔を変えて変倍を行う際、該第1群を物体側に凸
面を向けたメニスカス状の負の第11レンズと両レンズ面
が凸面の正の第12レンズより構成し、該第2群を正の第
21レンズと負の第22レンズより構成し、該第1群と第2
群の焦点距離を各々F1,F2、該第11レンズと第12レンズ
の材質のアッベ数を各々ν11,ν12、全系の広角端にお
ける焦点距離をEW、該第11レンズと第12レンズの材質の
屈折率を各々n11,n12とするとき 0.4< F1/FW < 1.2 −1.5< F2/FW <−0.5 ν11<40 50<ν12 1.56< n11 <1.65 n12< 1.52 なる条件を満足することを特徴とする簡易な構成のズー
ムレンズ。1. A zoom lens system comprising: a first lens unit having a positive refractive power and a second lens unit having a negative refractive power in order from the object side; The first lens unit includes a negative meniscus eleventh lens having a convex surface facing the object side and a positive twelfth lens whose both lens surfaces are convex. The second lens unit includes a positive lens.
The first lens unit and the second lens unit comprise a 21st lens and a negative 22nd lens.
The focal length of the group is F1, F2, the Abbe number of the material of the eleventh lens and the twelfth lens is ν11, ν12, respectively, the focal length at the wide-angle end of the entire system is EW, the material of the eleventh lens and the twelfth lens Where the refractive indices of n11 and n12 are respectively 0.4 <F1 / FW <1.2−1.5 <F2 / FW <−0.5 ν11 <40 50 <ν12 1.56 <n11 <1.65 n12 <1.52 Zoom lens with a simple configuration.
面の曲率半径を各々RA,RBとしたとき なる条件を満足することを特徴とする請求項1記載の簡
易な構成のズームレンズ。2. When the radii of curvature of the object-side and image-side lens surfaces of the 22nd lens are RA and RB, respectively. 2. A zoom lens having a simple configuration according to claim 1, wherein the following condition is satisfied.
ける主点間隔を各々eW,eTとしたとき 1.7<eW/eT<2.7 なる条件を満足することを特徴とする請求項1記載の簡
易な構成のズームレンズ。3. The condition that 1.7 <eW / eT <2.7 is satisfied when the principal point intervals at the wide-angle end and the telephoto end of the first group and the second group are eW and eT, respectively. A zoom lens having a simple configuration according to 1.
屈折力の第2群の2つのレンズ群を有し、双方のレンズ
群の間隔を変えて変倍を行う際、該第1群を物体側に凸
面を向けたメニスカス状の負の第11レンズと両レンズ面
が凸面の正の第12レンズより構成し、該第2群を正の第
21レンズと負の第22レンズより構成し、該第1群と第2
群の焦点距離を各々F1,F2、該第11レンズと第12レンズ
の材質のアッベ数を各々ν11,ν12、全系の広角端にお
ける焦点距離をFW、該第11レンズと第12レンズの材質の
屈折率を各々n11,n12、該第11レンズの物体側又は像面
側には非球面が施されており、該非球面の4次の非球面
係数をB、有効画面の対角線長をYとしたとき 0.4< F1/FW < 1.2 −1.5< F2/FW <−0.5 ν11<40 50<ν12 1.56< n11 <1.65 n12< 1.52 1<|B・Y3|<15 なる条件を満足することを特徴とする簡易な構成のズー
ムレンズを有したカメラ。4. A zoom lens system comprising: a first lens unit having a positive refractive power and a second lens unit having a negative refractive power in order from the object side; The first lens unit includes a negative meniscus eleventh lens having a convex surface facing the object side and a positive twelfth lens whose both lens surfaces are convex. The second lens unit includes a positive lens.
The first lens unit and the second lens unit comprise a 21st lens and a negative 22nd lens.
The focal length of the group is F1, F2, the Abbe number of the material of the eleventh lens and the twelfth lens is ν11, ν12, the focal length at the wide angle end of the entire system is FW, the material of the eleventh lens and the twelfth lens. N11, n12, an aspherical surface is provided on the object side or the image surface side of the eleventh lens, the fourth order aspherical coefficient of the aspherical surface is B, and the diagonal length of the effective screen is Y. 0.4 <F1 / FW <1.2−1.5 <F2 / FW <−0.5 ν11 <40 50 <ν12 1.56 <n11 <1.65 n12 <1.52 1 <| B · Y 3 | <15 A camera having a simple configuration of a zoom lens.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1299173A JP2811828B2 (en) | 1989-11-17 | 1989-11-17 | Zoom lens having simple configuration and camera having the same |
US07/614,591 US5218478A (en) | 1989-11-17 | 1990-11-13 | Small-sized zoom lens |
MYPI90002007A MY104524A (en) | 1989-11-17 | 1990-11-14 | Small-sized zoom lens. |
KR90018666A KR940009866B1 (en) | 1989-11-17 | 1990-11-17 | Small-sized zoom lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1299173A JP2811828B2 (en) | 1989-11-17 | 1989-11-17 | Zoom lens having simple configuration and camera having the same |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03158814A JPH03158814A (en) | 1991-07-08 |
JP2811828B2 true JP2811828B2 (en) | 1998-10-15 |
Family
ID=17869081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1299173A Expired - Fee Related JP2811828B2 (en) | 1989-11-17 | 1989-11-17 | Zoom lens having simple configuration and camera having the same |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2811828B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3248906B2 (en) * | 1990-11-30 | 2002-01-21 | 旭光学工業株式会社 | Zoom lens |
JP3087185B2 (en) * | 1991-04-09 | 2000-09-11 | コニカ株式会社 | Small zoom lens including wide angle |
JP3314786B2 (en) * | 1991-10-22 | 2002-08-12 | オリンパス光学工業株式会社 | Zoom lens using plastic |
JP3245469B2 (en) * | 1993-01-26 | 2002-01-15 | オリンパス光学工業株式会社 | Two-group zoom lens |
JP3366101B2 (en) * | 1994-03-23 | 2003-01-14 | オリンパス光学工業株式会社 | High zoom ratio 2-group zoom lens |
JP3435364B2 (en) * | 1998-12-24 | 2003-08-11 | ペンタックス株式会社 | Zoom lens system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2900435B2 (en) * | 1989-10-13 | 1999-06-02 | ミノルタ株式会社 | Compact zoom lens |
JP2605147B2 (en) * | 1989-10-13 | 1997-04-30 | ミノルタ株式会社 | Compact zoom lens |
JP2900434B2 (en) * | 1989-10-13 | 1999-06-02 | ミノルタ株式会社 | Compact zoom lens |
-
1989
- 1989-11-17 JP JP1299173A patent/JP2811828B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH03158814A (en) | 1991-07-08 |
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