JPH0534598A - Compact zoom lens - Google Patents
Compact zoom lensInfo
- Publication number
- JPH0534598A JPH0534598A JP19537091A JP19537091A JPH0534598A JP H0534598 A JPH0534598 A JP H0534598A JP 19537091 A JP19537091 A JP 19537091A JP 19537091 A JP19537091 A JP 19537091A JP H0534598 A JPH0534598 A JP H0534598A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- positive
- negative
- variable power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明はビデオカメラ等に適し
た高性能高変倍で比較的コンパクトなズームレンズに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-performance, high-magnification, relatively compact zoom lens suitable for video cameras and the like.
【０００２】[0002]
【従来の技術】近年、家庭用の一体型ビデオカメラが広
く普及してきた。その中でも携帯性にすぐれた小型のも
のが主流となりつつある。このような背景には高変倍で
高性能なズームレンズをコンパクト化するといった技術
があり、これによってよりコンパクトなカメラが実現可
能となってきた。2. Description of the Related Art In recent years, home-use integrated video cameras have become widespread. Among them, small ones with excellent portability are becoming mainstream. Against this background, there is a technology for making a zoom lens with high zoom ratio and high performance to be compact, which makes it possible to realize a more compact camera.
【０００３】このようなコンパクトなレンズタイプで６
〜８倍程度のズームレンズでは特開昭62-24213号公報や
特開平2-311811号公報に見られるごとく正で固定の第１
群、負で移動する第２群、正で固定の第３群、正で移動
する第４群構成のものが知られている。しかしながらよ
り高変倍でコンパクトなズームレンズの要望は多く上記
のような公知のレンズでは、さらなる高変倍化を行な
い、コンパクト化を行なった場合、マスター系のコンパ
クト化にともない射出瞳が短くなり、また負のペッツバ
ール和の増大を招いてしまい、ディストーションの補正
も困難となってくるという欠点があった。6 with such a compact lens type
In the case of a zoom lens with a magnification of up to 8 times, the positive first lens is fixed as shown in JP-A-62-24213 and JP-A-2-311811.
Known are a group, a second group that moves negatively, a third group that is positive and fixed, and a fourth group that moves positively. However, there are many demands for a zoom lens that has a higher zoom ratio and a more compact size. With the known lenses described above, if the zoom ratio is further increased and the zoom lens is made compact, the exit pupil becomes shorter as the master system becomes compact. In addition, there is a drawback that the negative Petzval sum is increased, and it becomes difficult to correct the distortion.
【０００４】[0004]
【発明の目的】本発明は、高変倍で高性能でかつコンパ
クトなズームレンズを得ることを目的とするものであ
る。SUMMARY OF THE INVENTION It is an object of the present invention to obtain a zoom lens having high zoom ratio, high performance and compact size.
【０００５】[0005]
【発明の構成】本発明は物体側より順に変倍時に固定で
正の第１レンズ群、変倍にともなって移動する第２レン
ズ群、変倍時に固定で正の第３レンズ群、変倍にともな
って移動する正の第４レンズ群、変倍時に固定で正の第
５レンズ群を有し、第２レンズ群は、物体側に凸面を向
けた負メニスカス単レンズと、負レンズと正レンズの貼
り合せダブレットで構成され、第４レンズ群は少なくと
も１つの非球面を有し、正レンズと負レンズの貼り合せ
ダブレットで構成されたことを特徴とするズームレンズ
である。According to the present invention, in order from the object side, the first lens group is fixed and is positive during zooming, the second lens group is moved with zooming, the third lens group is fixed and positive during zooming, and zooming is performed. It has a positive fourth lens group that moves in accordance with the above, and a positive fifth lens group that is fixed during zooming. The second lens group has a negative meniscus single lens with a convex surface facing the object side, and a negative lens and a positive lens group. A zoom lens comprising a cemented doublet of lenses, a fourth lens group having at least one aspherical surface, and comprising a cemented doublet of a positive lens and a negative lens.
【０００６】またさらに以下の条件を満足することが本
発明を実施するにおいて望ましい。(1)本発明において
第３レンズ群に少なくとも１つの非球面を有すること。Further, it is desirable to carry out the present invention that the following conditions are satisfied. (1) In the present invention, the third lens group should have at least one aspherical surface.
【０００７】(2)本発明において第５レンズ群に少なく
とも１つの非球面を有すること。(2) In the present invention, the fifth lens group should have at least one aspherical surface.
【０００８】(3)本発明において 0.1＜ＦW・│ｆ2│／(ｆW・Ｚ)＜0.4 を満足すること。(3) In the present invention, 0.1 <F W · | f 2 | / (f W · Z) <0.4 is satisfied.
【０００９】ただし ＦW：ワイド端のＦナンバー ｆ2：第２レンズ群の焦点距離 ｆW：ワイド端における全系の焦点距離 Ｚ :ズーム比 (4)本発明において ｎ4+／ｎ4-＜1.0 1.1＜ν4+／ν4- を満足すること。However, F W : F number at wide end f 2 : Focal length of second lens group f W : Focal length of entire system at wide end Z: Zoom ratio (4) In the present invention, n 4+ / n 4- <1.0 1.1 <ν 4+ / ν 4- is satisfied.
【００１０】ただし ｎ4+：第４レンズ群の正レンズの屈折率 ｎ4-： 〃 負レンズの屈折率 ν4+： 〃 正レンズのアッベ数 ν4+： 〃 負レンズのアッベ数Where n 4+ is the refractive index of the positive lens in the fourth lens group n 4- : is the refractive index of the negative lens ν 4+ : is the Abbe number of the positive lens ν 4+ is the Abbe number of the negative lens
【００１１】[0011]
【作用】本発明は物体側から順に変倍時に固定である正
のレンズ群、変倍作用を有し変倍にともなって移動する
負の第２レンズ群と有する。そして第２レンズ群を物体
側に凸面を向けた負メニスカス単レンズと、負レンズ、
及び正レンズによって構成することによって変倍にとも
なう歪曲収差の変化及び倍率色収差の良好な補正を行っ
ている。変倍時に固定で正の第３レンズ群は、第２レン
ズ群から出射される発散光を第４レンズ群へ導くために
用いられたものである。第４レンズ群は正の屈折力を有
し、結像作用のために用いられたもので、変倍時に生じ
る結像位置の変動を補正するように移動する。そして第
４レンズ群は正レンズと負レンズの貼り合せダブレット
で構成され、これによって貼り合せを用いない場合にく
らべ偏心などの誤差に対する収差変動を小さくすること
を可能としている。また第４レンズ群に非球面を用いる
ことは貼り合せレンズを用いたことによって減少した収
差補正の能力をおぎない、特に球面収差及び非点収差を
良好に補正してこのような簡単な構成でありながらレン
ズ系のコンパクト化と良好な性能を実現している。第５
レンズ群は変倍時に固定で正の屈折力を有しており、こ
の群をレンズ系のもっとも像面側に配することによって
レンズ系のコンパクト化にともない生じる負のペッツバ
ール和の増大及び射出瞳の短縮をおさえ、高変倍でコン
パクト化しても良好な画像を得ることを可能としてい
る。The present invention has, in order from the object side, a positive lens group which is fixed during zooming, and a negative second lens group which has a zooming effect and moves with zooming. Then, a negative meniscus single lens with the second lens group having a convex surface facing the object side, a negative lens,
Further, by using a positive lens, a change in distortion due to zooming and a chromatic aberration of magnification are corrected well. The third lens group, which is fixed and positive at the time of zooming, is used for guiding the divergent light emitted from the second lens group to the fourth lens group. The fourth lens group has a positive refracting power, is used for an image forming action, and moves so as to correct the fluctuation of the image forming position which occurs during zooming. The fourth lens group is composed of a cemented doublet of a positive lens and a negative lens, which makes it possible to reduce aberration fluctuations due to errors such as decentering as compared with the case where the cementing is not used. Further, the use of an aspherical surface in the fourth lens group does not impair the ability of aberration correction reduced by using a cemented lens, and in particular, spherical aberration and astigmatism are satisfactorily corrected, which is such a simple configuration. However, it has achieved compactness of the lens system and good performance. Fifth
The lens group has a fixed and positive refractive power at the time of zooming, and by arranging this group on the most image plane side of the lens system, the negative Petzval sum increases and the exit pupil increases as the lens system becomes more compact. It is possible to obtain a good image even if the size is shortened and the zoom ratio is high.
【００１２】また本発明は副次的に条件(1)ないし、条
件(4)を満足することが望ましい。条件(1)では、第３レ
ンズ群に非球面を有することによって、ワイドからミド
ルにかけての球面収差を補正し、またワイドからテレに
かけてのコマフレアーの発生をおさえて、より一層の性
能向上が望める。条件(2)では像面にもっとも近い、第
５レンズ群に少なくとも１つの非球面を有することによ
って非点収差及びディストレーションの補正を、他の収
差に殆んど影響を与えることなく行なうことができる。
条件(3)は第２レンズ群の屈折力に関する条件で本条件
(3)を満足することが高変倍でコンパクトなレンズ系を
得るのに有利である。すなわち下限を超えるとある適当
なＦナンバーに対して第２レンズ群の焦点距離が短かく
なりすぎ、変倍による歪曲収差及びコマ収差等の変動が
大きくなりすぎる。また上限を超えた場合変倍時の移動
量が大きくなり、コンパクト化に不利となってくる。条
件(4)は、第４レンズ群の正レンズと負レンズの屈折率
とアッベ数に関する条件で、この条件を満足することが
軸上色収差及び画角の大きいところでの倍率色収差の補
正に望ましい。In the present invention, it is desirable that condition (1) to condition (4) is secondarily satisfied. In condition (1), the third lens group has an aspherical surface, so that spherical aberration from wide to middle is corrected, and coma flare from wide to tele is suppressed, further improving performance is expected. . Under the condition (2), by having at least one aspherical surface in the fifth lens group, which is closest to the image plane, it is possible to correct astigmatism and distortion without affecting other aberrations. it can.
Condition (3) is a condition related to the refractive power of the second lens group, and is the present condition.
Satisfying (3) is advantageous for obtaining a highly variable and compact lens system. That is, when the value goes below the lower limit, the focal length of the second lens unit becomes too short for a certain appropriate F number, and fluctuations in distortion and coma due to zooming become too large. Also, if the upper limit is exceeded, the amount of movement during zooming becomes large, which is disadvantageous for compactness. The condition (4) relates to the refractive indices and Abbe numbers of the positive lens and the negative lens of the fourth lens group, and it is desirable to satisfy these conditions for correcting axial chromatic aberration and lateral chromatic aberration at a large angle of view.
【００１３】[0013]
【実施例】以下、この発明のズームレンズの実施例を示
す。EXAMPLES Examples of the zoom lens of the present invention will be shown below.
【００１４】実施例中、Ｒは面の曲率半径、Ｄは面間
隔、Ｎは屈折率、νはアッベ数を示す（波長はｄ線＝58
7.56nm）。また別表に各実施例における本明細書中に記
載の諸値を示す。なお、実施例においては、レンズ最終
面と結像面の間にローパスフィルター、赤外カットフィ
ルター、フェースプレートに相当するカバーガラスが入
っている。表中の各記号は Ｒ：各屈折面の曲率半径 Ｄ：屈折面間隔 Ｎ：レンズの硝材の屈折率 ν：レンズの硝材のアッベ数 ｆ：レンズ全系の焦点距離 ２ω：画角 Ｆ：Ｆナンバー をそれぞれ示す。なお、実施例の具体的な構成は次のと
おりである。In the examples, R is the radius of curvature of the surface, D is the surface spacing, N is the refractive index, and ν is the Abbe number (wavelength is d-line = 58).
7.56 nm). In addition, various values described in the present specification in each example are shown in a separate table. In the examples, a low pass filter, an infrared cut filter, and a cover glass corresponding to a face plate are provided between the final lens surface and the image forming surface. Each symbol in the table is R: radius of curvature of each refracting surface D: distance between refracting surfaces N: refractive index of glass material of lens ν: Abbe number of glass material of lens f: focal length of entire lens system 2ω: angle of view F: F Show each number. The specific configuration of the embodiment is as follows.
【００１５】実施例中の非球面形状は、下記の式で表さ
れる。The aspherical surface shape in the embodiment is represented by the following formula.
【００１６】[0016]
【数１】 [Equation 1]
【００１７】但し、式中の各記号は、下記のとおりであ
る。However, each symbol in the formula is as follows.
【００１８】Ｃ＝１／Ｒ ： 非球面の近軸曲率 ｈ ： 光軸からの高さ Ｋ ： 円錐定数 φ ： 面頂点から光軸方向に測った非球面の変形
量（球面による変位量も含む） また実施例中のＤ−PQは10-PQを、Ｄ＋ＰＱは10+PQを表
している。C = 1 / R: Paraxial curvature of aspherical surface h: Height from optical axis K: Cone constant φ: Deformation amount of aspherical surface measured in optical axis direction from surface vertex (including displacement amount by spherical surface) ) also the D-PQ is 10 -PQ in example, D + PQ represents 10 + PQ.
【００１９】（実施例１）図１に示すレンズ構成を有し
たもので、下記（表１、表２、表３のレンズ数値をと
る。）(Embodiment 1) A lens having the lens structure shown in FIG. 1 and the following (lens numerical values in Table 1, Table 2 and Table 3 are taken).
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【表２】 [Table 2]
【００２２】[0022]
【表３】 [Table 3]
【００２３】図２、図３、図４は実施例１の収差図を示
すもので、図２はワイド、図３はミドル、図４はテレポ
ジションにおける収差図である。FIGS. 2, 3 and 4 are aberration diagrams of the first embodiment, FIG. 2 is a wide, FIG. 3 is a middle, and FIG. 4 is a teleposition.
【００２４】（実施例２）図１に示すレンズ構成を有し
たもので、下記（表４、表５、表６）のレンズ数値をと
る。(Embodiment 2) The lens having the lens structure shown in FIG. 1 is used, and the lens values shown in the following (Table 4, Table 5 and Table 6) are taken.
【００２５】[0025]
【表４】 [Table 4]
【００２６】[0026]
【表５】 [Table 5]
【００２７】[0027]
【表６】 [Table 6]
【００２８】図５、図６、図７は実施例２の収差図を示
すもので、図５はワイド、図６はミドル、図７はテレポ
ジションにおける収差図である。FIGS. 5, 6, and 7 are aberration diagrams of the second embodiment. FIG. 5 is a wide lens, FIG. 6 is a middle lens, and FIG.
【００２９】[0029]
【発明の効果】この発明によって、実施例１，２及び図
面に示した収差図に見られるように、10倍程度以上とい
った高変倍比でありながら、良好な性能を有し、またコ
ンパクトなズームレンズを実現することができた。According to the present invention, as shown in the aberration charts shown in the first and second embodiments and the drawings, it has a high zoom ratio of about 10 times or more, yet has good performance and is compact. We were able to realize a zoom lens.
【図１】本発明の実施例１、実施例２のレンズ構成を示
す断面図である。FIG. 1 is a cross-sectional view showing a lens configuration of Examples 1 and 2 of the present invention.
【図２】実施例１のワイドポジションにおける収差図で
ある。FIG. 2 is an aberration diagram of Example 1 at a wide position.
【図３】実施例１のミドルポジションにおける収差図で
ある。FIG. 3 is an aberration diagram of Example 1 at a middle position.
【図４】実施例１のテレポジションにおける収差図であ
る。FIG. 4 is an aberration diagram at a teleposition of the first example.
【図５】実施例２のワイドポジションにおける収差図で
ある。FIG. 5 is an aberration diagram at a wide position in Example 2.
【図６】実施例２のミドルポジションにおける収差図で
ある。FIG. 6 is an aberration diagram for Example 2 at a middle position.
【図７】実施例２のテレポジションにおける収差図であ
る。FIG. 7 is an aberration diagram for Example 2 at the teleposition.
Claims (1)
レンズ群、変倍にともなって移動する負の第２レンズ
群、変倍時に固定で正の第３レンズ群、変倍にともなっ
て移動する正の第４レンズ群、変倍時に固定で正の第５
レンズ群を有し、第２レンズ群は物体側に凸面を向けた
負メニスカス単レンズと、負レンズ、正レンズによって
構成され、第４レンズ群が正レンズと負レンズの貼り合
せダブレットで構成され、第４レンズ群中に少なくとも
１つの非球面を有したことを特徴とするコンパクトなズ
ームレンズ。Claims: 1. A fixed first positive lens unit during zooming in order from the object side.
A lens unit, a second negative lens unit that moves with zooming, a third positive lens unit that is fixed during zooming, a positive fourth lens unit that moves with zooming, and a fixed positive lens unit during zooming. Fifth
The second lens group includes a negative meniscus single lens having a convex surface facing the object side, a negative lens, and a positive lens, and the fourth lens group includes a cemented doublet of the positive lens and the negative lens. , A compact zoom lens having at least one aspherical surface in the fourth lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19537091A JPH0534598A (en) | 1991-08-05 | 1991-08-05 | Compact zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19537091A JPH0534598A (en) | 1991-08-05 | 1991-08-05 | Compact zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0534598A true JPH0534598A (en) | 1993-02-12 |
Family
ID=16340050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19537091A Pending JPH0534598A (en) | 1991-08-05 | 1991-08-05 | Compact zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0534598A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006220737A (en) * | 2005-02-08 | 2006-08-24 | Sony Corp | Zoom lens and imaging apparatus |
| JP2007248952A (en) * | 2006-03-17 | 2007-09-27 | Olympus Imaging Corp | Bending variable power optical system |
| JP2014089286A (en) * | 2012-10-30 | 2014-05-15 | Nikon Corp | Variable power optical system, optical device, and method of manufacturing variable power optical system |
| JP2014089287A (en) * | 2012-10-30 | 2014-05-15 | Nikon Corp | Variable power optical system, optical device, and method of manufacturing variable power optical system |
| US9874730B2 (en) | 2012-10-30 | 2018-01-23 | Nikon Corporation | Variable magnification optical system, optical device, and production method for variable magnification optical system |
| EP4099077A4 (en) * | 2020-02-29 | 2023-07-26 | Huawei Technologies Co., Ltd. | Zoom lens, camera module and mobile terminal |
-
1991
- 1991-08-05 JP JP19537091A patent/JPH0534598A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006220737A (en) * | 2005-02-08 | 2006-08-24 | Sony Corp | Zoom lens and imaging apparatus |
| JP2007248952A (en) * | 2006-03-17 | 2007-09-27 | Olympus Imaging Corp | Bending variable power optical system |
| JP2014089286A (en) * | 2012-10-30 | 2014-05-15 | Nikon Corp | Variable power optical system, optical device, and method of manufacturing variable power optical system |
| JP2014089287A (en) * | 2012-10-30 | 2014-05-15 | Nikon Corp | Variable power optical system, optical device, and method of manufacturing variable power optical system |
| US9874730B2 (en) | 2012-10-30 | 2018-01-23 | Nikon Corporation | Variable magnification optical system, optical device, and production method for variable magnification optical system |
| EP4099077A4 (en) * | 2020-02-29 | 2023-07-26 | Huawei Technologies Co., Ltd. | Zoom lens, camera module and mobile terminal |
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| JP3415765B2 (en) | Zoom lens |