JPS63256915A - Compact zoom lens - Google Patents
Compact zoom lensInfo
- Publication number
- JPS63256915A JPS63256915A JP9133087A JP9133087A JPS63256915A JP S63256915 A JPS63256915 A JP S63256915A JP 9133087 A JP9133087 A JP 9133087A JP 9133087 A JP9133087 A JP 9133087A JP S63256915 A JPS63256915 A JP S63256915A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- object side
- component
- negative
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005499 meniscus Effects 0.000 claims abstract description 5
- 239000002131 composite material Substances 0.000 claims abstract description 3
- 230000004075 alteration Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 206010010071 Coma Diseases 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Landscapes
- Lenses (AREA)
Abstract
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に好適なバックフォー
カスの短いズームレンズに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a zoom lens with a short back focus suitable for lens shutter cameras.
（従来の技術）
近年、レンズ交換を行わないレンズシャッターカメラ等
の小型カメラの分野でもズームレンズの装着が望まれる
ようになっており、従来用いられていた単焦点レンズと
同程度のバンクフォーカスの短＜、シかもレンズ系全長
の短いズームレンズが要望されている。(Prior art) In recent years, it has become desirable to install zoom lenses even in the field of small cameras such as lens shutter cameras that do not require lens replacement, and zoom lenses with the same level of bank focus as conventional single focus lenses have become desirable. There is a demand for a zoom lens with a short overall length.
このようなタイプのズームレンズは、特開昭５７−２０
１２１３号公報の、物界側より、少なくとも２枚以上の
正レンズ及び少なくとも１枚以上の負レンズを有し、全
体として正の屈折力を有する第１レンズ群、少なくとも
１枚以上の正レンズと少なくとも１枚以上の負レンズを
有し、全体として負の屈折力を有する第２レンズ群が順
次配され、前記第１レンズ群内の１枚の負レンズの物界
側と像界側に各々少なくとも１枚の正レンズを有し、前
記第２レンズ群内の最も物界側には像界側のレンズ面が
凸面である正レンズを有しており、前記第１レンズ群と
第２レンズ群の間の空気間隔を変えてズーミングする超
小型なズームレンズ、或いは特開昭５８−１８４９１６
号公報の、物体側から順に正の焦点距離を有する第１レ
ンズ群、正の焦点距離を有する第ゾレンズ群および負の
焦点距離を有する第３レンズ群の３群構成であり、広角
端から望遠端へ変倍するにつれ、第１レンズ群と第３レ
ンズ群は光軸に沿って像側から物体側へ単調に移動し、
第２レンズ群は、広角端では第１レンズ群に最も接近し
、望遠端では第３レンズ群に最も接近し、その間の焦点
距離では変倍による焦点移動を補正するように移動する
ズームレンズ系であって、第１レンズ群は少くとも１つ
の正レンズと１つの負レンズからなり、第２レンズ群は
少なくとも１つの正レンズからなり、第３レンズ群は少
なくとも１つの物体側に強い凹面を向けた負レンズとか
らなる小型３群ズームレンズ、更にまた特開昭６１−６
７０１７号公報の物体側より順に正の屈折力の第１レン
ズ群、負の屈折力の第２レンズ群そして負の屈折力の第
３レンズ群の３つのレンズ群を有し、前記第３レンズ群
を固定させ、前記第１レンズ群と第２レンズ群を物体側
へ異なる速度で移動させることにより変倍を行うことを
特徴とする小型のズームレンズ、等において提案されて
いる。This type of zoom lens was developed in Japanese Patent Application Laid-Open No. 57-20
From the object world side of Publication No. 1213, the first lens group has at least two or more positive lenses and at least one or more negative lenses, and has a positive refractive power as a whole, and at least one or more positive lenses. A second lens group having at least one negative lens and having negative refractive power as a whole is sequentially arranged, and is arranged on the object world side and the image field side of the one negative lens in the first lens group, respectively. It has at least one positive lens, and the second lens group includes a positive lens closest to the object world whose lens surface on the image field side is a convex surface, and the first lens group and the second lens Ultra-compact zoom lens that zooms by changing the air distance between the groups, or Japanese Patent Application Laid-Open No. 184916/1986
The 3-group structure of the above publication includes, in order from the object side, a first lens group with a positive focal length, a second lens group with a positive focal length, and a third lens group with a negative focal length. As the power is changed toward the end, the first lens group and the third lens group move monotonically from the image side to the object side along the optical axis.
A zoom lens system in which the second lens group is closest to the first lens group at the wide-angle end, closest to the third lens group at the telephoto end, and moves to compensate for focal shift due to zooming at focal lengths in between. The first lens group consists of at least one positive lens and one negative lens, the second lens group consists of at least one positive lens, and the third lens group has at least one strongly concave surface on the object side. A compact three-group zoom lens consisting of a negative lens and a negative lens, and also JP-A-61-6
Publication No. 7017 has three lens groups in order from the object side: a first lens group with a positive refractive power, a second lens group with a negative refractive power, and a third lens group with a negative refractive power, and the third lens A compact zoom lens and the like have been proposed in which the lens group is fixed and the magnification is changed by moving the first lens group and the second lens group toward the object side at different speeds.
（発明が解決しようとする問題点）
これらの従来技術の提案はズーム比が１．５倍程度、又
、バンクフォーカスを含めたレンズ系全長を短くする為
に、特にワイド時におけるバックフォーカスを焦点距離
に比してかなり小さくとってあり、その為に、焦点面に
近いレンズ群の径が大きいものになっている。カメラ全
体としてコンパクトにすることは困難であり、レンズも
高価なものとなってしまっている。(Problems to be Solved by the Invention) These prior art proposals have a zoom ratio of about 1.5 times, and in order to shorten the total length of the lens system including the bank focus, the focus is set at the back focus, especially at wide-angle. The distance is quite small compared to the distance, and for this reason the diameter of the lens group near the focal plane is large. It is difficult to make the camera as a whole compact, and the lenses are also expensive.
（問題点を解決するための手段）
本発明は、ズーム比２倍程度で、レンズ系全長を短くす
ると共に、ワイド時における焦点距離ｆｗとバックフォ
ーカスｆｂｗの比ｆ１、 ／ｆ、を０．２程度とし、レ
ンズ外径も小さく押え、無限から最近接距離まで、描写
性能の良好なコンパクトズームレンズを提供することを
目的とするものである。即ち、合成により正の屈折力よ
り成る第１レンズ群と負の屈折力を有する第２レンズ群
とより成り、第１レンズ群は物体側より正の第１成分、
負の第２成分及び正の第３成分より成り、第２レンズ群
は正の第４成分、負の第５成分並びに負の第６成分より
成り且つ各成分がそれぞれの条件を満足するものであり
、前記第１、第２のレンズ群の間隔変化により目的を達
成するものである。(Means for Solving the Problems) The present invention shortens the overall length of the lens system at a zoom ratio of about 2 times, and also reduces the ratio f1, /f, of the focal length fw to the back focus fbw at wide-angle to 0.2. The object of the present invention is to provide a compact zoom lens that has a small lens outer diameter and has good imaging performance from infinity to the closest distance. That is, the first lens group is composed of a first lens group having a positive refractive power and a second lens group having a negative refractive power, and the first lens group has a positive first component from the object side,
The second lens group consists of a negative second component and a positive third component, and the second lens group consists of a positive fourth component, a negative fifth component, and a negative sixth component, and each component satisfies the respective conditions. The objective is achieved by changing the distance between the first and second lens groups.
（作 用）
本発明は、レンズシャッターカメラ等小型カメラ用のズ
ームレンズとして、コンパクトでしかも２倍程度のズー
ム比を確保する要求に対し、物体側より正屈折力を有す
る第１レンズ群、負屈折力を有する第２レンズ群の２つ
のレンズ群を配し、この両方のレンズ間隔を変化させる
簡単な構成によりズーミングを行い、上記目的を達成し
たものである。(Function) The present invention meets the requirements for a zoom lens for compact cameras such as lens shutter cameras, which is compact and has a zoom ratio of approximately 2x, and which includes a first lens group having a positive refractive power and a negative refractive power from the object side. The above object is achieved by arranging two lens groups, the second lens group having refractive power, and performing zooming with a simple configuration in which the distance between the two lenses is changed.
（実施例）
本発明は第１図に示した実施例のレンズ構成図の如（、
物体側より順に正の屈折力を有する第１レンズ群Ａと負
の屈折力を有する第２レンズ群Ｂを有し、両レンズ群の
間隔を変えて変倍を行うズームレンズにおいて、前記第
１レンズ群Ａは物体側より順に、物体側へ凸面を向けた
正メニスカスレンズの第１成分Ｌ１、両凹レンズと両凸
レンズを貼合せ像側に凸面を向けた合成として負のパワ
ーを持った第２成分Ｌ２、物体側により曲率の強い面を
有する両凸レンズの第３成分Ｌ３で構成され、第２レン
ズ群Ｂは、像側により曲率の強い面を有する正レンズの
第４成分り１、物体側により曲率の強い面を有する両凹
レンズの第５成分り６、物体側により曲率の強い面を有
する負メニスカスレンズの第６成分Ｌ６から成り、
全系のワイド時の焦点距離を九
第１レンズ群Ａ１第２レンズ群Ｂの焦点距離をそれぞれ
ｆｌ、ｆ２
第１レンズ群への第３成分Ｌ３の焦点距離をｆｌ３とす
る時、条件
（１）０．６９ ＜ ｆ、／ ｆｗ＜０．７５（２）
０．７２ ＜ ｆ２／ ｆｗ＜ ０．６７（３）０
．７７＜ ｆ＋ｓ／ｆ＋＜０．８７の各条件を満足する
ものである。(Embodiment) The present invention is as shown in the lens configuration diagram of the embodiment shown in FIG.
In the zoom lens, which has a first lens group A having a positive refractive power and a second lens group B having a negative refractive power in order from the object side, and performs magnification by changing the distance between both lens groups, Lens group A includes, in order from the object side, the first component L1, which is a positive meniscus lens with a convex surface facing the object side, and the second component L1, which has a negative power and is a composite of a biconcave lens and a biconvex lens bonded together with a convex surface facing the image side. The second lens group B consists of a component L2, a third component L3 of a biconvex lens having a surface with a stronger curvature on the object side, and a fourth component L3 of a positive lens having a surface with a stronger curvature on the image side. The fifth component L6 is a biconcave lens with a surface with a strong curvature, and the sixth component L6 is a negative meniscus lens with a surface with a strong curvature on the object side. When the focal lengths of A1 and the second lens group B are respectively fl and f2, and the focal length of the third component L3 to the first lens group is fl3, the condition (1) is 0.69 < f, / fw < 0.75 ( 2)
0.72 < f2/ fw < 0.67 (3) 0
．． This satisfies the following conditions: 77<f+s/f+<0.87.
上記の条件（１）、（２）は各群の合成屈折力を規定す
るもので、変倍率を高め、フィルム給送用部材を配置で
きる程度のバックフォーカスを確保し、かつレンズ系全
長をコンパクトにする為の条件である。Conditions (1) and (2) above define the combined refractive power of each group, increasing the magnification ratio, ensuring a back focus sufficient to accommodate the film feeding member, and making the overall length of the lens system compact. This is the condition for making it.
各レンズ群の屈折力を弱める事は、収差補正上有利であ
るが、変倍をする際の各レンズ群の移動量が大きくなり
、コンパクト化が困難となってくる。なお、条件（１）
及び、条件（２）の上限を越えるとバックフォーカスが
短くなり過ぎ、所定の周辺光量を確保する為に第２レン
ズ群Ｂの外径を大きくする必要があり、レンズが高価に
なってしまうと同時にフィルム給送部材の配置も困難と
なる。又、条件（１）及び条件（２）の下限を越えると
、第１レンズ群へと第２レンズ群Ｂの主点間隔が短くな
り、レンズ群の移動スペースを大きくすることができな
い為に高変倍率を得る事はできない。Weakening the refractive power of each lens group is advantageous for correcting aberrations, but the amount of movement of each lens group when changing magnification increases, making it difficult to make the lens compact. Furthermore, condition (1)
If the upper limit of condition (2) is exceeded, the back focus will become too short, and the outer diameter of the second lens group B will need to be increased in order to secure a predetermined amount of peripheral light, making the lens expensive. At the same time, it becomes difficult to arrange the film feeding member. Furthermore, if the lower limits of conditions (1) and (2) are exceeded, the distance between the principal points of the second lens group B to the first lens group becomes shorter, and the movement space of the lens groups cannot be increased, so the height is increased. It is not possible to obtain variable magnification.
条件（３）は第１レンズ群への第３成分Ｌ３ の屈折力
を規定するもので、各焦点域全体において、球面収差及
びコマ収差補正に適切な条件を与えるものである。上限
を越えれば球面収差及びコマ収差が補正不足となり他の
成分で補正することは困難である。下限を越えた場合は
逆に補正過剰となり、特にテレ側でのメリジオナル像面
がオーバーになり他の成分で補正することは困難である
。Condition (3) defines the refractive power of the third component L3 to the first lens group, and provides appropriate conditions for correcting spherical aberration and coma aberration throughout each focal region. If the upper limit is exceeded, spherical aberration and coma aberration will be insufficiently corrected, and it will be difficult to correct them with other components. If the lower limit is exceeded, on the contrary, over-correction will occur, and especially the meridional image plane on the telephoto side will be over-corrected, making it difficult to correct with other components.
次に本発明による実施の態様を示す。しかして屈折率ｎ
ｄ及びアツベ数νｄはｄ線（λ＝ ５８７．６ｎｍ）に
対するものである。Next, embodiments of the present invention will be described. However, the refractive index n
d and the Atsube number νd are for the d-line (λ=587.6 nm).
実施態様１゜
焦点距離ｆ ＝ ３５．６〜６９．０、ＦＮ丁−３，５
〜６．７８
画角２ω−６１，８°〜３４．８゜
ｆｌ／ｆ、＝０．７３１ ｆ２／ｆ、−一０．７０
２ｆ１３／ｆ、＝０．７９９ ｆｂ、／ｆｗ＝０．
２２９実施態様２゜
焦点距離ｆ ＝ ３５．６〜６９．０、ＦＮｏ ＝３．
５〜６．７８画角２ω−６１．８°〜３４，８゜
ｆ、／ｆ、＝０．７３９ ｆ２／Ｌ−−０，７０８
ｆ、３／ｒ、＝０．８５９ ｆｂ、／ｆ、＝０．２
０９実施態様３゜
焦点距離ｆ ＝ ３５．６〜６９．０、ＦＮｏ＝３．５
〜６，７８、
画角２ω−６１，８°〜３４．８゜
ｆｌ／ｆｗ＝０．７２５ ｆ２／ｆ、−−０，６９
７ｆ＋３／ｆ、−０，７９５ｆｂｗ／ｆｗ＝０．２２１
（発明の効果）
以上の如く、本発明によれば、ズーム比２倍程度でバッ
クフォーカスの短い、レンズシャッターカメラ等に好適
な諸収差が良好に補正されたコンパクトなズームレンズ
が得られる。Embodiment 1° Focal length f = 35.6-69.0, FN-3,5
~6.78 Angle of view 2ω-61.8°~34.8°fl/f, =0.731 f2/f, -10.70
2f13/f,=0.799 fb,/fw=0.
229 embodiment 2° focal length f = 35.6-69.0, FNo = 3.
5 ~ 6.78 Angle of view 2ω - 61.8° ~ 34,8° f, /f, = 0.739 f2/L - 0,708
f,3/r,=0.859 fb,/f,=0.2
09 embodiment 3° focal length f = 35.6 to 69.0, FNo = 3.5
~6,78, Angle of view 2ω-61,8°~34.8°fl/fw=0.725 f2/f, -0,69
7f+3/f, -0,795fbw/fw=0.221
(Effects of the Invention) As described above, according to the present invention, it is possible to obtain a compact zoom lens with a zoom ratio of about 2 times, a short back focus, and various aberrations that are well corrected and suitable for lens shutter cameras and the like.
図は本発明ズームレンズを示すもので、第１図はワイド
時とテレ時とを示す光学図である。第２図は実施態様１
．の諸収差図、第３図は実施態様２゜の諸収差図、第４
図は実施態様３．の諸収差図である。
Ａ・・・・・・第１レンズ群 Ｂ・・・・・・第２
レンズ群Ｌ１・・・・・・第１成分 Ｌ２・・・
・・・第２成分Ｌ３・・・・・・第３成分 Ｌ４
・・・・・・第４成分Ｌ５・・・・・・第５成分
Ｌ６・・・・・・第６成分Ｓ・・・・・・絞り
第３図
ｍ ＝ Ｉ”７４” ＱＪ −１７，４′−”Ｔ
ｈ曲収４′）１点収岸′The figure shows the zoom lens of the present invention, and FIG. 1 is an optical diagram showing the zoom lens in wide-angle mode and telephoto mode. Figure 2 shows embodiment 1.
．． Fig. 3 is a diagram of various aberrations of embodiment 2゜, Fig. 4 is a diagram of various aberrations of embodiment 2゜.
The figure shows embodiment 3. It is a diagram of various aberrations. A: 1st lens group B: 2nd lens group
Lens group L1...First component L2...
...Second component L3...Third component L4
...Fourth component L5...Fifth component
L6...6th component S...3rd diagram of aperture m = I"74" QJ -17,4'-"T
h song collection 4') 1 point collection'
Claims (1)
屈折力を有する第２レンズ群を有し、両レンズ群の間隔
を変えて変倍を行うズームレンズにおいて、前記第１レ
ンズ群は、物体側より順に物体側へ凸面を向けた正メニ
スカスレンズの第１成分、両凹レンズと両凸レンズを貼
合せ像側に凸面を向けた合成として負のパワーを持った
第２成分、物体側により曲率の強い面を有する両凸レン
ズの第３成分であり、第２レンズ群は、像側により曲率
の強い面を有する正レンズの第４成分、物体側により曲
率の強い面を有する両凹レンズの第５成分、物体側によ
り曲率の強い面を有する負メニスカスレンズの第６成分
から成り、 全系のワイド時の焦点距離をｆ＿ｗ、 第１レンズ群、第２レンズ群の各焦点距離をそれぞれｆ
＿１、ｆ＿２、 第１レンズ群の第３成分の焦点距離をｆ＿１＿３、とす
る時 （１）０．６９＜ｆ＿１／ｆ＿ｗ＜０．７５（２）−０
．７２＜ｆ＿２／ｆ＿ｗ＜−０．６７（３）０．７７＜
ｆ＿１＿３／ｆ＿１＜０．８７の各条件を満足する事を
特徴とするコンパクトズームレンズ。[Claims] In a zoom lens that has a first lens group having a positive refractive power and a second lens group having a negative refractive power in order from the object side, and changes the magnification by changing the distance between both lens groups. , the first lens group has negative power as a composite of the first component of a positive meniscus lens with its convex surface facing the object side in order from the object side, a biconcave lens and a biconvex lens laminated together with the convex surface facing the image side. The second component is the third component of a biconvex lens that has a surface with a stronger curvature on the object side, and the second lens group is the fourth component of a positive lens that has a surface with a stronger curvature on the image side, which has a stronger curvature on the object side. The fifth component is a biconcave lens with a surface, and the sixth component is a negative meniscus lens with a surface with a stronger curvature on the object side. Each focal length is f
_1, f_2, When the focal length of the third component of the first lens group is f_1_3, (1) 0.69<f_1/f_w<0.75 (2) -0
．． 72<f_2/f_w<-0.67(3)0.77<
A compact zoom lens characterized by satisfying the following conditions: f_1_3/f_1<0.87.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62091330A JP2538777B2 (en) | 1987-04-14 | 1987-04-14 | Compact zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62091330A JP2538777B2 (en) | 1987-04-14 | 1987-04-14 | Compact zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63256915A true JPS63256915A (en) | 1988-10-24 |
| JP2538777B2 JP2538777B2 (en) | 1996-10-02 |
Family
ID=14023438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62091330A Expired - Lifetime JP2538777B2 (en) | 1987-04-14 | 1987-04-14 | Compact zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2538777B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6452111A (en) * | 1987-03-17 | 1989-02-28 | Olympus Optical Co | Compact zoom lens |
| JPH02190812A (en) * | 1989-01-20 | 1990-07-26 | Canon Inc | Two-group zoom lens |
| JPH02284109A (en) * | 1989-04-26 | 1990-11-21 | Konica Corp | Small-sized wide angle zoom lens |
| JPH0317608A (en) * | 1989-06-15 | 1991-01-25 | Fuji Photo Optical Co Ltd | Switching type tri-focal optical system |
| US5687027A (en) * | 1995-03-02 | 1997-11-11 | Canon Kabushiki Kaisha | Zoom lens for optical apparatus such as camera |
| US5844725A (en) * | 1994-09-06 | 1998-12-01 | Canon Kabushiki Kaisha | Zoom lens |
| US6008953A (en) * | 1996-07-26 | 1999-12-28 | Canon Kabushiki Kaisha | Zoom lens |
| CN110361838A (en) * | 2019-06-29 | 2019-10-22 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
-
1987
- 1987-04-14 JP JP62091330A patent/JP2538777B2/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6452111A (en) * | 1987-03-17 | 1989-02-28 | Olympus Optical Co | Compact zoom lens |
| JPH0512685B2 (en) * | 1987-03-17 | 1993-02-18 | Olympus Optical Co | |
| JPH02190812A (en) * | 1989-01-20 | 1990-07-26 | Canon Inc | Two-group zoom lens |
| JPH02284109A (en) * | 1989-04-26 | 1990-11-21 | Konica Corp | Small-sized wide angle zoom lens |
| JPH0317608A (en) * | 1989-06-15 | 1991-01-25 | Fuji Photo Optical Co Ltd | Switching type tri-focal optical system |
| US5844725A (en) * | 1994-09-06 | 1998-12-01 | Canon Kabushiki Kaisha | Zoom lens |
| US5687027A (en) * | 1995-03-02 | 1997-11-11 | Canon Kabushiki Kaisha | Zoom lens for optical apparatus such as camera |
| US6008953A (en) * | 1996-07-26 | 1999-12-28 | Canon Kabushiki Kaisha | Zoom lens |
| CN110361838A (en) * | 2019-06-29 | 2019-10-22 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| US11106008B2 (en) | 2019-06-29 | 2021-08-31 | Aac Optics Solutions Pte. Ltd. | Camera optical lens |
| CN110361838B (en) * | 2019-06-29 | 2021-09-21 | 瑞声光学解决方案私人有限公司 | Image pickup optical lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2538777B2 (en) | 1996-10-02 |
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