JPH0843737A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPH0843737A JPH0843737A JP6178503A JP17850394A JPH0843737A JP H0843737 A JPH0843737 A JP H0843737A JP 6178503 A JP6178503 A JP 6178503A JP 17850394 A JP17850394 A JP 17850394A JP H0843737 A JPH0843737 A JP H0843737A
- Authority
- JP
- Japan
- Prior art keywords
- group
- zoom lens
- lens
- refractive power
- wide
- 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
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
- G02B15/144—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
- G02B15/144507—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 -++-
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【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小型の高変倍で広画角のズ
ームレンズに関し、特に撮影画角の広画角化を図ると共
にレンズ全長（第１レンズ面から像面までの距離）の短
縮化を図った携帯性に優れた撮影用のズームレンズに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact zoom lens having a high zoom ratio and a wide angle of view, which is suitable for a lens shutter camera, a video camera, etc. The present invention relates to a zoom lens for photographing which is excellent in portability and has a shortened distance from one lens surface to an image surface.
【０００２】[0002]
【従来の技術】最近レンズシャッターカメラ、ビデオカ
メラ等においては、カメラの小型化に伴いレンズ全長の
短い小型のズームレンズが要求されている。2. Description of the Related Art Recently, in a lens shutter camera, a video camera, etc., a compact zoom lens having a short total lens length has been demanded as the camera becomes smaller.
【０００３】特にレンズシャッターカメラは、ズーム駆
動用の電気回路などの周辺技術の発達などにより、増々
カメラの小型化が進んでおり、それに備わる撮影レンズ
も高変倍でかつコンパクトなズームレンズが要求されて
いる。In particular, the lens shutter camera is becoming smaller and smaller due to the development of peripheral technologies such as an electric circuit for zoom driving, and a photographing lens provided therein is required to have a high zoom ratio and a compact zoom lens. Has been done.
【０００４】従来、レンズシャッター用のズームレンズ
としては正、負の屈折力の２つのレンズ群より成る所謂
２群ズームレンズが主流であった。この２群ズームレン
ズはレンズ構成及び変倍時の移動機構が簡易なため、カ
メラの小型化及び比較的低コストである等の利点があ
る。Conventionally, as a zoom lens for a lens shutter, a so-called two-group zoom lens composed of two lens groups having positive and negative refracting powers has been mainly used. Since the two-group zoom lens has a simple lens structure and a moving mechanism at the time of zooming, it has advantages such as downsizing of the camera and relatively low cost.
【０００５】しかしながら変倍作用を１つのレンズ群の
みで行わなくてはならないため、その変倍比は１．６〜
２倍程度であり、無理に変倍比を拡大することはレンズ
系の大型化を招くと同時に、高い光学性能を保つことが
困難になってくる。However, since the zooming action must be performed by only one lens group, the zooming ratio is 1.6 to
It is about 2 times, and forcibly enlarging the zoom ratio leads to an increase in the size of the lens system, and at the same time, it becomes difficult to maintain high optical performance.
【０００６】２群ズームレンズを基礎とし、第１群を正
の屈折力の２つのレンズ群に分離し、全体として正、
正、負の屈折力の３群構成として高変倍比を狙った３群
ズームレンズが、例えば特開平３−２８２４０９号公
報、特開平４−３７８１０号公報、特開平４−７６５１
１号公報等で提案されている。On the basis of a two-group zoom lens, the first group is divided into two lens groups having a positive refractive power, and the whole group is positive,
A three-group zoom lens aiming at a high zoom ratio as a three-group configuration of positive and negative refracting power is disclosed in, for example, JP-A-3-282409, JP-A-4-37810, and JP-A-4-7651.
It is proposed in Japanese Patent Publication No. 1 and the like.
【０００７】しかしながらこのレンズ群構成で例えば半
画角３５°以上の広画角なズームレンズ系を達成しよう
とすると変倍時の入射瞳位置の変化が大きくなる。この
ため、高変倍化を図る際は変倍による収差変動を抑える
ことが大変困難になってくる。However, if an attempt is made to achieve a wide-angle zoom lens system having a half angle of view of 35 ° or more with this lens group configuration, the change in the entrance pupil position during zooming becomes large. For this reason, it becomes very difficult to suppress aberration variation due to zooming when achieving high zooming.
【０００８】この他、多レンズ群化により広画端の半画
角を３８°程度、変倍比を３．５倍程度とし、広画角化
及び高変倍化を図ったズームレンズが、例えば特開平２
−７２３１６号公報、特開平３−２４９６１４号公報で
提案されている。In addition to this, a zoom lens having a wide field angle and a high zoom ratio with a wide field end having a half field angle of about 38 ° and a zoom ratio of about 3.5 due to the formation of a multi-lens group, For example, Japanese Patent Application Laid-Open No. 2
-72316 and Japanese Patent Laid-Open No. 3-249614.
【０００９】しかしながら、これらのズームレンズ系は
前玉径及びレンズ全長が共に大型であり、コンパクトカ
メラの撮影レンズとしては必ずしも十分でない。However, these zoom lens systems have a large front lens diameter and a large overall lens length, and are not always sufficient as a taking lens for a compact camera.
【００１０】特に外部ファインダーを使用するカメラに
適用する際は、広画端時にレンズ鏡筒がファインダーの
撮影視野を遮ってしまうという問題点がある。又この結
果、ファインダー配置やカメラの形態の制限を与えてし
まうという問題点も生じてくる。Particularly when applied to a camera using an external viewfinder, there is a problem that the lens barrel obstructs the field of view of the viewfinder at the wide image end. Further, as a result, there arises a problem that the viewfinder arrangement and the camera form are restricted.
【００１１】一方、負正正負の４群を有するズームレン
ズの従来例として、米国特許明細書第４７８７７１８
号、同第４７５６６０９号、同第５１１１３３８号、同
第５２７０８６５号、同第５２７４５０４号、特開平４
−１５６１０号、特開平４−２３７００９号があり、こ
れらはいずれも広角端から望遠端へのズーミングで、第
１、第２レンズ群間隔が減少する様に移動する。On the other hand, as a conventional example of a zoom lens having four groups of negative, positive, negative, and US Pat. No. 4,787,718.
No. 4,756,609, No. 5,111,338, No. 5,270,865, No. 5,274,504, JP-A No.
No. 15610 and Japanese Patent Laid-Open No. 4-237090, both of which move such that the distance between the first and second lens groups decreases with zooming from the wide-angle end to the telephoto end.
【００１２】その際、米国特許明細書第４７８７７１８
号は２倍程度の変倍比であり、また米国特許明細書第４
７５６６０９号、同第５２７０８６５号、同第５２７４
５０４号、特開平４−１５６１０号記載のレンズ系では
３倍程度で且つ広角化が不充分であった。At this time, US Pat. No. 4,787,718
No. 4 has a variable power ratio of about 2 times, and US Pat.
No. 756609, No. 5270865, No. 5274
In the lens system described in JP-A No. 504 and JP-A-4-15610, the widening of the angle was about 3 times and the angle of view was insufficient.
【００１３】米国特許明細書第５１１１３３８号、特開
平４−２３７００９号では広角化、高変倍比は達成され
ているが、レンズ枚数が極めて多く、且つ前玉径が実用
に適さないほど大きくなっている。In US Pat. No. 5,111,338 and Japanese Unexamined Patent Publication No. 4-237090, a wide angle and a high zoom ratio are achieved, but the number of lenses is extremely large and the diameter of the front lens becomes too large for practical use. ing.
【００１４】[0014]
【発明が解決しようとする課題】一般にズームレンズに
おいて各レンズ群の屈折力を強めれば所定の変倍比を得
る為の各レンズ群の移動量が少なくなり、レンズ全長の
短縮化を図りつつ高変倍化が可能となる。しかしながら
単に各レンズ群の屈折力を強めると変倍に伴う収差変動
が大きくなり、特に高変倍化及び広画角化を図る際には
全変倍範囲にわたり良好なる光学性能を得るのが難しく
なってくるという問題点がある。Generally, in a zoom lens, if the refractive power of each lens group is increased, the amount of movement of each lens group for obtaining a predetermined zoom ratio is reduced, and the total lens length is shortened. High zoom ratio is possible. However, if the refracting power of each lens unit is simply increased, the aberration variation due to zooming becomes large, and it is difficult to obtain good optical performance over the entire zooming range, especially when achieving high zooming and widening the angle of view. There is a problem that it will become.
【００１５】本発明は良好な収差を実現しつつ広角端の
画角を拡大すると共に変倍比を高め、更に全系の小型化
を図ることを課題としている。因みに後述する数値実施
例では撮影画角が７３．５度程度、変倍比が３．５倍程
度のズームレンズを実現している。It is an object of the present invention to enlarge the angle of view at the wide-angle end while increasing good zoom ratio, increase the zoom ratio, and further reduce the size of the entire system. Incidentally, in a numerical example to be described later, a zoom lens having a photographing field angle of about 73.5 degrees and a zoom ratio of about 3.5 is realized.
【００１６】又前記課題に従属する課題として（１）高
変倍且つ良好な収差の補正を達成、（２）フォーカシン
グによる収差変動の良好な抑制、（３）各レンズ群のレ
ンズ枚数を削減するにもかかわらず良好な収差、補正、
（４）広角端の光学全長の短縮、（５）ズーミングの中
間域の収差補正を容易にする事、（６）充分な変倍比を
確保する事、（７）第１レンズ群が第４レンズ群の色収
差を補正するために移動する条件、（８）望遠時の全長
の短縮を挙げられる。As problems subordinate to the above problems, (1) high zooming and good aberration correction are achieved, (2) aberration variation due to focusing is excellently suppressed, and (3) the number of lenses in each lens group is reduced. Nevertheless, good aberration, correction,
(4) Shortening the total optical length at the wide-angle end, (5) facilitating aberration correction in the middle region of zooming, (6) ensuring a sufficient zoom ratio, (7) the first lens group is fourth The conditions for moving to correct the chromatic aberration of the lens group, and (8) shortening of the total length at telephoto are mentioned.
【００１７】[0017]
１．物体側より順に負の屈折力の第１群、正の屈折力の
第２群、正の屈折力の第３群、負の屈折力の第４群の４
つのレンズ群を有し、各群の間の空気間隔を変化させる
事によって変倍を行うズームレンズにおいて、広角端よ
り望遠端へのズーミングに際し、第１群と第２群の間の
空気間隔が増大し、第２群と第３群の間の空気間隔が増
大し、第３群と第４群の間の空気間隔が減少する様に各
群を移動させる。以上の構成は従属の課題（１）にも関
係する。1. 4 from the first group having negative refractive power, the second group having positive refractive power, the third group having positive refractive power, and the fourth group having negative refractive power in order from the object side.
In a zoom lens that has two lens groups and performs zooming by changing the air spacing between each group, when zooming from the wide-angle end to the telephoto end, the air spacing between the first and second groups is Each group is moved so as to increase, the air gap between the second group and the third group increases, and the air gap between the third group and the fourth group decreases. The above configuration also relates to the subordinate issue (1).
【００１８】２．物体側より順に負の屈折力の第１群、
正の屈折力の第２群、正の屈折力の第３群、負の屈折力
の第４群の４つのレンズ群を有し、各群の間の空気間隔
を変化させる事によって変倍を行うズームレンズにおい
て、広角端より望遠端へのズーミングに際し、第１群と
第２群の間の空気間隔が増大し、第３群と第４群の間の
空気間隔が減少する様に各群を移動させると共に、第３
群にてフォーカシングを行う。以上の構成は従属の課題
（２）にも関係する。2. The first group having negative refractive power in order from the object side,
It has four lens groups, a second lens group having a positive refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power, and the magnification is changed by changing the air space between the respective lens groups. In the zoom lens to be used, when zooming from the wide-angle end to the telephoto end, the air gap between the first and second groups increases, and the air gap between the third and fourth groups decreases. And move the third
Focus on the group. The above configuration is also related to the subordinate issue (2).
【００１９】３．物体側より順に負の屈折力の第１群、
正の屈折力の第２群、正の屈折力の第３群、負の屈折力
の第４群の４つのレンズ群を有し、各群の間の空気間隔
を変化させる事によって変倍を行うズームレンズにおい
て、広角端より望遠端へのズーミングに際し、第１群と
第２群の間の空気間隔が増大し、第３群と第４群の間の
空気間隔が減少する様に各群を移動させると共に、全群
１体にてフォーカシングを行う。以上の構成は従属の課
題（２）にも関係する。3. The first group having negative refractive power in order from the object side,
It has four lens groups, a second lens group having a positive refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power, and the magnification is changed by changing the air space between the respective lens groups. In the zoom lens to be used, when zooming from the wide-angle end to the telephoto end, the air gap between the first and second groups increases, and the air gap between the third and fourth groups decreases. While moving, focus on one body in all groups. The above configuration is also related to the subordinate issue (2).
【００２０】４．物体側より順に負の屈折力の第１群、
正の屈折力の第２群、正の屈折力の第３群、負の屈折力
の第４群の４つのレンズ群を有し、各群の間の空気間隔
を変化させる事によって変倍を行うズームレンズにおい
て、広角端より望遠端へのズーミングに際し、第１群と
第２群の間の空気間隔が増大し、第３群と第４群の間の
空気間隔が減少する様に各群を移動させると共に、第４
群中に少なくとも１面の非球面を有する。4. The first group having negative refractive power in order from the object side,
It has four lens groups, a second lens group having a positive refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power, and the magnification is changed by changing the air space between the respective lens groups. In the zoom lens to be used, when zooming from the wide-angle end to the telephoto end, the air gap between the first and second groups increases, and the air gap between the third and fourth groups decreases. While moving the 4th
It has at least one aspherical surface in the group.
【００２１】以上の構成により主課題と従属課題（３）
を果たすと共に、広画角における画角特性及びズーミン
グに伴うコマ収差等の補正を良好に行うものである。With the above configuration, the main problem and the dependent problem (3)
In addition, the angle of view characteristics in a wide angle of view and the coma aberration due to zooming are corrected well.
【００２２】５．物体側より順に負の屈折力の第１群、
正の屈折力の第２群、正の屈折力の第３群、負の屈折力
の第４群の４つのレンズ群を有し、各群の間の空気間隔
を変化させる事によって変倍を行うズームレンズにおい
て、広角端より望遠端へのズーミングに際し、第１群と
第２群の間の空気間隔が増大し、第３群と第４群の間の
空気間隔が減少する様に各群を移動させると共に、第３
群中に少なくとも１枚の非球面を有する正レンズと少な
くとも１枚の負レンズを有する。以上の構成により主課
題と従属課題（３）を果たすものである。5. The first group having negative refractive power in order from the object side,
It has four lens groups, a second lens group having a positive refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power, and the magnification is changed by changing the air space between the respective lens groups. In the zoom lens to be used, when zooming from the wide-angle end to the telephoto end, the air space between the first and second groups increases, and the air space between the third and fourth groups decreases. And move the third
It has at least one positive lens having an aspherical surface and at least one negative lens in the group. With the above configuration, the main task and the subordinate task (3) are fulfilled.
【００２３】６．又、以下の条件を満足すると更に良
い。6. It is even better if the following conditions are satisfied.
【００２４】前記レンズ系において、前記第３群中に少
なくとも１面の非球面を有する事。In the lens system, at least one aspherical surface should be included in the third lens group.
【００２５】前記レンズ系において、前記１〜４群はズ
ーミング中４群共、物体側へ移動する事。In the lens system, the first to fourth groups should move to the object side during zooming.
【００２６】前記レンズ系において、前記第３群中に絞
りを有する事。In the lens system, an aperture is provided in the third lens group.
【００２７】前記レンズ系において、前記第４群の最も
物体側のレンズは負レンズである事。In the lens system, the lens closest to the object in the fourth group is a negative lens.
【００２８】前記レンズ系において、前記第４群は物体
側に周辺で負の屈折力が弱くなる非球面を有する負の単
レンズにて構成される事。In the lens system, the fourth lens unit should be composed of a negative single lens having an aspherical surface on the object side where the negative refractive power is weakened in the periphery.
【００２９】７．前記レンズ系において、望ましくは以
下の条件式を満足する事。7. In the lens system, it is preferable that the following conditional expression is satisfied.
【００３０】 −３×１０-2＜ｈｈ3t／（ｆt −ｆw ）＜２×１０-2…（１） ｆw ；広角端における全系の焦点距離 ｆt ；望遠端における全系の焦点距離 ｈｈ3t；望遠端における第３群と第４群の主点間隔[0030] -3 × 10 -2 <hh 3t / (f t -f w) <2 × 10 -2 ... (1) f w; of the entire system at the telephoto end focal length f t of the entire system at the wide angle end Focal length hh 3t ; principal point distance between the 3rd and 4th lens groups at the telephoto end
【００３１】前記レンズ系において、望ましくは以下の
条件式を満足する事。In the above lens system, it is desirable that the following conditional expression be satisfied.
【００３２】 ０．１＜（ｄ1t−ｄ1w）／ｆw ＜０．９…（２） ｄiw；広角端における第ｉ群と第ｉ＋１群の空気間隔 ｄit；望遠端における第ｉ群と第ｉ＋１群の空気間隔 ３．０×１０-3＜ｄ1w／ｆw ＜０．２…（３） ３＜ｄ1t／ｄ1w＜５０…（４） ２＜ｄ2t／ｄ2w＜１０…（４） 前記レンズ系において、望ましくは以下の条件式を満足
する事。[0032] 0.1 <(d 1t -d 1w) / f w <0.9 ... (2) d iw; i-th group at the telephoto end; i-th group and the i + 1 group of the air gap d it in the wide-angle end the air gap of the i + 1 group 3.0 × 10 -3 <d 1w / f w <0.2 ... (3) 3 <d 1t / d 1w <50 ... (4) 2 <d 2t / d 2w <10 (4) In the lens system, it is preferable that the following conditional expression is satisfied.
【００３３】−９０＜ｆ1 ／ｆw ＜−３…（６） ｆ1 ；第１群の焦点距離 −０．８＜ｆ4 ／ｆw ＜−０．３…（７） ｆ4 ；第４群の焦点距離[0033] -90 <f 1 / f w < -3 ... (6) f 1; focal length of the first group -0.8 <f 4 / f w < -0.3 ... (7) f 4; the Focal length of 4 groups
【００３４】前記レンズ系において、望ましくは以下の
条件式を満足する事。In the above lens system, it is desirable that the following conditional expression be satisfied.
【００３５】 ２．０＜Ｂｅｔａ４ｔ／Ｂｅｔａ４ｗ＜５．０…（８） Ｂｅｔａ４ｗ；広角端における第４群の倍率 Ｂｅｔａ４ｔ；望遠端における第４群の倍率 前記レンズ系において、更に望ましくは（１）〜（８）
の条件式を全て満足する。2.0 <Beta4t / Beta4w <5.0 (8) Beta4w: Magnification of fourth group at wide-angle end Beta4t: Magnification of fourth group at telephoto end More preferably, (1) to (8)
All the conditional expressions of are satisfied.
【００３６】又前記レンズ系は、望ましくは各レンズ面
を通過する広角域における軸外光線が最も像側のレンズ
面で最も高い位置を通る構成を採り、一方、ズーミング
の広角端から望遠端にかけて各レンズ群は物体側へ移動
する。The above-mentioned lens system preferably has a configuration in which an off-axis ray in a wide-angle range passing through each lens surface passes through the highest position on the lens surface closest to the image side, while from the wide-angle end to the telephoto end of zooming. Each lens group moves to the object side.
【００３７】[0037]
【実施例】前述の様に、正負型の２群ズームレンズを基
本型として負正正負４群構成のズームレンズは従来も存
在したが、従来の４群構成ズームレンズで例えば３．５
倍以上の高倍率を実施すると、主たる変倍分担を負った
レンズ群の移動に伴う収差変動が無視し難くなる。その
ためそれらレンズ群のレンズ枚数を増加させて収差補正
を行う必要が生じる。As described above, there has been a zoom lens having a positive / negative type two-group zoom lens as a basic type and having a structure of four groups of negative, positive, negative, and negative in the past.
When a high magnification equal to or more than 2 times is implemented, it becomes difficult to ignore the aberration variation due to the movement of the lens group, which is mainly responsible for the magnification variation. Therefore, it is necessary to increase the number of lenses in those lens groups to perform aberration correction.
【００３８】即ちレンズ群の屈折力を強めて全長の短縮
を図った場合、レンズ枚数を増やせば収差は抑えられる
ものの、レンズ枚数の増加は撮影レンズをカメラ本体へ
ある程度以上沈胴させることを困難にしている。That is, when the refractive power of the lens group is strengthened to reduce the total length, the aberration can be suppressed by increasing the number of lenses, but the increase in the number of lenses makes it difficult to retract the taking lens into the camera body to some extent. ing.
【００３９】本発明の主要な特徴は、負正正負の４群構
成において広角から望遠へのズーミングの際、第１群と
第２群との間隔を増大させたことである。これにより、
主たる変倍分担を負う第４群で発生する色収差の変動を
第１群で補正する事ができるので第４群の収差補正に対
する負担が減り、レンズ枚数の大幅な増加を防止でき
る。The main feature of the present invention is that the distance between the first group and the second group is increased during zooming from the wide angle to the telephoto in the negative, positive, positive, and negative four-group configuration. This allows
Since the first group can correct the variation of the chromatic aberration generated in the fourth group, which is mainly responsible for zooming, the burden on the aberration correction of the fourth group is reduced, and a large increase in the number of lenses can be prevented.
【００４０】次に各条件式と極値の意味を説明する。Next, each conditional expression and the meaning of the extreme value will be described.
【００４１】（１）式は望遠端における第３群と第４群
の主点間隔と、望遠と広角側の焦点距離に関するもので
ある。（１）式の上限値を越えて第３群と第４群の主点
間隔が大きくなり過ぎると所定の変倍比を得るのが困難
となり、もし無理に所定の変倍比を確保したパワー配置
にすると、望遠端における全長が長くなってしまう。
（１）式の下限値を越えて主点間隔が小さくなり過ぎる
と、第３、第４群間の実間隔を確保するのが困難とな
り、製造誤差等に起因して両群が衝突するおそれがあ
る。Equation (1) relates to the distance between the principal points of the third and fourth lens units at the telephoto end and the focal lengths on the telephoto and wide-angle sides. If the distance between the principal points of the third group and the fourth group exceeds the upper limit of equation (1) and it becomes too large, it becomes difficult to obtain a predetermined zoom ratio, and if the power that forcibly secures the predetermined zoom ratio is obtained. If it is arranged, the total length at the telephoto end becomes long.
If the principal point spacing becomes too small below the lower limit of equation (1), it becomes difficult to secure the actual spacing between the third and fourth groups, and there is a risk of collision between the two groups due to manufacturing errors or the like. There is.
【００４２】（２）式は第１群と第２群の望遠と広角時
の空気間隔と広角端の焦点距離に関するもので、（２）
式の上限値を越えて望遠時の第１、第２群の間隔が大き
くなり過ぎると、望遠端におけるレンズ全長が長くなり
過ぎるので良くない。（２）式の下限値を越えて第１、
第２群の望遠、広角時の空気間隔が小さくなり過ぎる
と、第４群で発生する収差変動の第１群による相殺が困
難になるので全体として良好なる収差が困難となる。The equation (2) relates to the telephoto distance between the first lens group and the second lens group, the air distance at wide angle, and the focal length at the wide angle end.
If the distance between the first and second lens units at the telephoto end becomes too large beyond the upper limit of the equation, the total lens length at the telephoto end becomes too long, which is not good. If the lower limit of expression (2) is exceeded,
When the distance between the second lens group and the telephoto lens at the wide-angle is too small, it becomes difficult for the first lens group to cancel the aberration variation occurring in the fourth lens group, and thus it becomes difficult to obtain good aberrations as a whole.
【００４３】（３）式は広角時における第１群と第２群
間隔と、広角時の焦点距離に関するものである。（３）
式の上限値を越えて広角端における第１、第２群の間隔
が大きくなり過ぎると、広角端における全系の長さ及び
前玉径が増大してくる。（３）式の下限値を越えて第
１、第２群の間隔が小さくなり過ぎると、製造誤差等が
あると両群が衝突するおそれがある。Equation (3) relates to the distance between the first and second lens units at wide angle and the focal length at wide angle. (3)
If the distance between the first and second groups at the wide-angle end becomes too large beyond the upper limit of the formula, the length of the entire system and the front lens diameter at the wide-angle end increase. If the distance between the first and second groups becomes too small below the lower limit of the expression (3), there is a risk of collision between the two groups due to manufacturing errors or the like.
【００４４】（４）式は望遠、広角時の第１、第２群の
間隔比に関するものである。（４）式の上限値を越えて
望遠時における第１、第２群の間隔が大きくなり過ぎる
と望遠時における全長が長くなって不都合である。
（４）式の下限値を越えて望遠時における第１、第２群
間隔が小さくなり過ぎるとズーミングによる色収差の補
正が困難となる。Equation (4) relates to the distance ratio between the first and second lens groups at the telephoto and wide angle. If the distance between the first and second groups in the telephoto state becomes too large beyond the upper limit of the equation (4), the total length in the telephoto state becomes long, which is inconvenient.
If the distance between the first and second lens groups at the telephoto position becomes too small below the lower limit of the expression (4), it becomes difficult to correct chromatic aberration due to zooming.
【００４５】（５）式は第２、第３群の望遠、広角時の
間隔比に関するものである。（５）式の上限を越えて望
遠時における第２、第３群の間隔が大きくなり過ぎると
望遠時の全長が不所望の長さとなる。（５）式の下限を
越えて望遠時の第２、第３群の間隔が小さくなり過ぎる
と、ズーミングの際の諸収差の変動を補正するのが困難
になって来る。The equation (5) relates to the distance ratio between the second and third lens units at the telephoto and wide angle. If the distance between the second and third lens groups in the telephoto state becomes too large beyond the upper limit of the equation (5), the total length in the telephoto state becomes an undesired length. If the distance between the second and third lens units at the telephoto position becomes too small below the lower limit of the expression (5), it becomes difficult to correct variations in various aberrations during zooming.
【００４６】（６）式は第１群の焦点距離と広角端の全
系焦点距離の比に関するものである。（６）式の上限値
を越えて第１群の焦点距離が短くなり過ぎると望遠端に
おけるレトロ比が大きくなり、望遠時の全長が不所望の
長さとなる。（６）式の下限を越えて第１群の焦点距離
が長くなり過ぎると広角側の画角特性が悪くなり、広角
時における軸外収差を補正するのが困難となる。Equation (6) relates to the ratio of the focal length of the first lens unit to the focal length of the entire system at the wide-angle end. If the focal length of the first lens unit becomes too short beyond the upper limit of the expression (6), the retro ratio at the telephoto end becomes large, and the total length at the telephoto end becomes an undesired length. If the focal length of the first lens unit becomes too long beyond the lower limit of the expression (6), the field angle characteristic on the wide angle side deteriorates, and it becomes difficult to correct the off-axis aberration at the wide angle.
【００４７】（７）式は第４群の焦点距離と望遠端の焦
点距離の比に関するものである。（７）式の上限値を越
えて第４群の焦点距離が短か過ぎると、広角端付近にお
けるコマフレアーの補正が困難になってくる。（７）式
の下限を越えて第４群の焦点距離が長くなり過ぎると、
ズーミングのための第４群の移動ストロークが増大し、
望遠時の全長が不所望の長さとなって良くない。Equation (7) relates to the ratio of the focal length of the fourth lens unit to the focal length at the telephoto end. If the focal length of the fourth lens unit is too short beyond the upper limit of the expression (7), it becomes difficult to correct coma flare near the wide angle end. If the focal length of the fourth lens unit becomes too long below the lower limit of equation (7),
The movement stroke of the fourth group for zooming increases,
The total length at the telephoto end is undesirably long.
【００４８】（８）式は第４群の望遠時と広角時の倍率
の比に関するものである。（８）式の上限値を越えて第
４群の倍率比が大きくなり過ぎるとズーミングに伴う諸
収差の変動を補正するのが困難となる。（８）式の下限
値を越えて第４群の倍率比が小さくなり過ぎると、他の
部位で変倍比を確保する必要が生じ、レンズ系全体が大
きくなる傾向となって良くない。The expression (8) relates to the ratio of magnifications of the fourth lens unit at the telephoto position and at the wide angle position. If the magnification ratio of the fourth lens unit becomes too large beyond the upper limit of the equation (8), it becomes difficult to correct the variation of various aberrations due to zooming. If the lower limit of the expression (8) is exceeded and the magnification ratio of the fourth lens unit becomes too small, it becomes necessary to secure a variable power ratio in other parts, which is not preferable because the entire lens system tends to become large.
【００４９】前述した（１）〜（８）の条件式の上限値
又は下限値もしくは両者を、下記の極値に従って減縮す
るのは作用を高めるために好ましい。It is preferable to reduce the upper limit value or the lower limit value or both of the conditional expressions (1) to (8) according to the following extreme values in order to enhance the action.
【００５０】 −５×１０-3＜ｈｈ3t／（ｆt −ｆw ）＜８×１０-3…（１）′ ０．３＜（ｄ1t−ｄ1w）／ｆw ＜０．６…（２）′ １×１０-2＜ｄ1w／ｆw ＜６×１０-2…（３）′ １０＜ｄ1t／ｄ1w＜３５…（４）′ ３．５＜ｄ2t／ｄ2w＜７…（５）′ −２５＜ｆ1 ／ｆw ＜−４…（６）′ −０．７＜ｆ4 ／ｆw ＜−０．４５…（７）′ ２．５＜β4t／β4w＜３．５…（８）′[0050] -5 × 10 -3 <hh 3t / (f t -f w) <8 × 10 -3 ... (1) '0.3 <(d 1t -d 1w) / f w <0.6 ... (2) '1 × 10 -2 <d 1w / f w <6 × 10 -2 ... (3)' 10 <d 1t / d 1w <35 ... (4) '3.5 <d 2t / d 2w < 7 ... (5) '-25 < f 1 / f w <-4 ... (6)' -0.7 <f 4 / f w <-0.45 ... (7) '2.5 <β 4t / β 4w <3.5 ... (8) '
【００５１】図１から図４は数値実施例１から４に夫々
対応するズームレンズの断面図を示しており、（Ａ）は
広角端、（Ｂ）は中間画角、（Ｃ）は望遠端を示してい
る。図中、１は第１群、２は第２群、３は第３群、４は
第４群である。広角端から望遠端へのズーミングの際、
各レンズ群は物体側へ移動すると共に第１群と第２群２
の空気間隔は増大し、第２群２と第３群３の空気間隔は
増大し、第３群３と第４群４の空気間隔は減少する。フ
ォーカシングは第３群３又は全系を一体に移動して行
う。1 to 4 are sectional views of zoom lenses corresponding to Numerical Embodiments 1 to 4, respectively. (A) is a wide-angle end, (B) is an intermediate angle of view, and (C) is a telephoto end. Is shown. In the figure, 1 is a first group, 2 is a second group, 3 is a third group, and 4 is a fourth group. When zooming from the wide-angle end to the telephoto end,
Each lens group moves to the object side, and the first group and the second group 2
The air gap between the second group 2 and the third group 3 increases, and the air gap between the third group 3 and the fourth group 4 decreases. Focusing is performed by moving the third group 3 or the entire system as a unit.
【００５２】図１から図３のズームレンズにおいて、第
１群１の構成は像側レンズ面の曲率がもう一方の面に比
べてきつい両凸レンズと物体側凹レンズ面がもう一方の
面の屈折力より強い負レンズの２枚構成である。In the zoom lens shown in FIGS. 1 to 3, the first group 1 is constructed such that the curvature of the image-side lens surface is tighter than that of the other surface and the biconvex lens and the object-side concave lens surface have refractive powers of the other surface. It is a two-lens structure with a stronger negative lens.
【００５３】図４のズームレンズにおいて、第１群の構
成は像側に非球面を有する負レンズ１枚のみから成る。In the zoom lens of FIG. 4, the first lens group is composed of only one negative lens element having an aspherical surface on the image side.
【００５４】図１から図４のズームレンズにおいて、第
２群の構成は、物体側が凸面の正のメニスカスレンズ１
枚のみで構成されている。In the zoom lens of FIGS. 1 to 4, the second lens unit has a positive meniscus lens 1 having a convex surface on the object side.
It consists of only one sheet.
【００５５】図１と図２のズームレンズにおいて、第３
群の構成は、絞りを最も物体側に配し、物体側が凹面の
負メニスカスレンズと、像側レンズ面の曲率がもう一方
の面に比してきつい２枚の正レンズの計３枚で構成され
ている。In the zoom lens of FIG. 1 and FIG.
The configuration of the group is composed of a negative meniscus lens having a concave surface on the object side and a positive meniscus lens having an image-side lens surface whose curvature is tighter than that of the other surface, for a total of three lenses. ing.
【００５６】図３と図４において、第３群の構成は、絞
りを最も物体側に配し、物体側が凹面の負のメニスカス
レンズと像側レンズ面の曲率がもう一方のレンズ面に比
してきつい両凸レンズの２枚で構成されている。In FIGS. 3 and 4, the third lens unit has a diaphragm arranged closest to the object side and has a negative meniscus lens having a concave surface on the object side and an image-side lens surface whose curvature is greater than that of the other lens surface. It consists of two biconvex lenses.
【００５７】図１から図４のズームレンズ共、第３群の
最も像側のレンズ面に非球面を有する。Both the zoom lenses of FIGS. 1 to 4 have an aspherical surface on the lens surface closest to the image side of the third lens unit.
【００５８】図１から図４において、第４群は物体側の
レンズの曲率がもう一方よりきつい凹面で且つ非球面を
有する１枚のみの負レンズより成っている。In FIGS. 1 to 4, the fourth lens unit is composed of only one negative lens whose lens surface on the object side is concave more tightly than the other and has an aspherical surface.
【００５９】以下数値実施例を記載する。Numerical examples will be described below.
【００６０】Ｒｉは曲率半径、Ｄｉはレンズ面間隔、Ｎ
ｉは屈折率、νｉはアッベ数。Ri is the radius of curvature, Di is the lens surface distance, N
i is the refractive index and νi is the Abbe number.
【００６１】非球面はThe aspherical surface is
【００６２】[0062]
【外１】 で表し、Ａ〜Ｅは係数である。またｅ＋ｉは×１０i
を、ｅ−ｉは×１０-eを示すものとする。[Outside 1] , And A to E are coefficients. Also, e + i is × 10 i
, Ei represents x10 -e.
【００６３】図５から図８までの収差曲線図は順に数値
実施例１から４に対応する。（Ａ）は広角端、（Ｂ）は
中間画角、（Ｃ）は望遠端である。The aberration curve diagrams of FIGS. 5 to 8 correspond to Numerical Examples 1 to 4 in order. (A) is a wide-angle end, (B) is an intermediate angle of view, and (C) is a telephoto end.
【００６４】[0064]
【外２】 [Outside 2]
【００６５】[0065]
【外３】 [Outside 3]
【００６６】[0066]
【外４】 [Outside 4]
【００６７】[0067]
【外５】 条件式に従って、数値実施例について計算した値を示
す。[Outside 5] The values calculated for the numerical examples according to the conditional expressions are shown.
【００６８】[0068]
【表１】 [Table 1]
【００６９】[0069]
【発明の効果】以上述べた通り本発明によれば極めて広
画角、例えば７３．５度の撮影画角、高変倍比、例えば
３．５乃至４倍を達成し、変倍範囲全域に渡り高い光学
性能を実現し且つ著しくコンパクトなズームレンズを提
供する。As described above, according to the present invention, an extremely wide angle of view, for example, a shooting angle of view of 73.5 degrees and a high zoom ratio, for example, 3.5 to 4 are achieved, and the entire zoom range is achieved. (EN) Provided is a zoom lens which realizes extremely high optical performance and is extremely compact.
【図１】数値実施例１のレンズ断面図。FIG. 1 is a lens cross-sectional view of Numerical Example 1.
【図２】数値実施例２のレンズ断面図。FIG. 2 is a lens cross-sectional view of Numerical Example 2.
【図３】数値実施例３のレンズ断面図。FIG. 3 is a lens cross-sectional view of Numerical Example 3.
【図４】数値実施例４のレンズ断面図。FIG. 4 is a lens cross-sectional view of Numerical Example 4.
【図５】数値実施例１の諸収差図。FIG. 5 is a diagram of various types of aberration of Numerical example 1.
【図６】数値実施例２の諸収差図。FIG. 6 is a diagram of various types of aberration in Numerical example 2.
【図７】数値実施例３の諸収差図。FIG. 7 is a diagram of various types of aberration in Numerical example 3.
【図８】数値実施例４の諸収差図。FIG. 8 is a diagram of various types of aberration of Numerical example 4.
【符号の説明】 １ 第１群（第１レンズ群） ２ 第２群（第２レンズ群） ３ 第３群（第３レンズ群） ４ 第４群（第４レンズ群） Ｓ サジタル面 Ｍ メリディオナル面 ｄ ｄ線 ｇ ｇ線[Explanation of Codes] 1 first group (first lens group) 2 2nd group (2nd lens group) 3 3rd group (3rd lens group) 4 4th group (4th lens group) S sagittal surface M meridional Surface d d line g g line
Claims (19)
の屈折力の第２群、正の屈折力の第３群、負の屈折力の
第４群の４つレンズ群を有し、各群間の空気間隔を変化
させる事によって変倍を行うズームレンズにおいて、広
角端より望遠端へのズーミングに際し、第１群と第２群
の間の空気間隔が増大し、第２群と第３群の間の空気間
隔が増大し、第３群と第４群の間の空気間隔が減少する
様に各群を移動させる事を特徴とするズームレンズ。1. A four-lens group consisting of a first group having a negative refractive power, a second group having a positive refractive power, a third group having a positive refractive power, and a fourth group having a negative refractive power in order from the object side. In a zoom lens that has a zoom ratio that varies by changing the air space between each group, the air space between the first group and the second group increases during zooming from the wide-angle end to the telephoto end. A zoom lens, wherein each group is moved so that an air gap between the third group and the third group increases and an air gap between the third group and the fourth group decreases.
の屈折力の第２群、正の屈折力の第３群、負の屈折力の
第４群の４つのレンズ群を有し、各群間の空気間隔を変
化させる事によって変倍を行うズームレンズにおいて、
広角端より望遠端へのズーミングに際し、第１群と第２
群の間の空気間隔が増大し、第３群と第４群の間の空気
間隔が減少する様に各群を移動させると共に、第３群に
てフォーカシングを行う事を特徴とするズームレンズ。2. A four-lens group having a negative refractive power first group, a positive refractive power second group, a positive refractive power third group, and a negative refractive power fourth group in order from the object side. In a zoom lens that has a variable magnification by changing the air space between each group,
When zooming from the wide-angle end to the telephoto end, the first group and the second group
A zoom lens characterized in that each group is moved so that the air gap between the groups increases and the air gap between the third group and the fourth group decreases, and focusing is performed by the third group.
の屈折力の第２群、正の屈折力の第３群、負の屈折力の
第４群の４つのレンズ群を有し、各群間の空気間隔を変
化させる事によって変倍を行うズームレンズにおいて、
広角端より望遠端へのズーミングに際し、第１群と第２
群の間の空気間隔が増大し、第３群と第４群の間の空気
間隔が減少する様に各群を移動させると共に、全群一体
にてフォーカシングを行う事を特徴とするズームレン
ズ。3. A four-lens group having a negative refractive power first group, a positive refractive power second group, a positive refractive power third group, and a negative refractive power fourth group in order from the object side. In a zoom lens that has a variable magnification by changing the air space between each group,
When zooming from the wide-angle end to the telephoto end, the first group and the second group
A zoom lens characterized in that each group is moved so that the air gap between the groups is increased and the air gap between the third group and the fourth group is reduced, and focusing is carried out as a whole.
の屈折力の第２群、正の屈折力の第３群、負の屈折力の
第４群の４つのレンズ群を有し、各群間の空気間隔を変
化させる事によって変倍を行うズームレンズにおいて、
広角端より望遠端へのズーミングに際し、第１群と第２
群の間の空気間隔が増大し、第３群と第４群の間の空気
間隔が減少する様に各群を移動させると共に、第４群中
に少なくとも１面の非球面を有する事を特徴とするズー
ムレンズ。4. A four-lens group consisting of a first group having a negative refractive power, a second group having a positive refractive power, a third group having a positive refractive power, and a fourth group having a negative refractive power in order from the object side. In a zoom lens that has a variable magnification by changing the air space between each group,
When zooming from the wide-angle end to the telephoto end, the first group and the second group
Each group is moved so that the air space between the groups increases and the air space between the third group and the fourth group decreases, and at least one aspherical surface is included in the fourth group. And a zoom lens.
の屈折力の第２群、正の屈折力の第３群、負の屈折力の
第４群の４つのレンズ群を有し、各群間の空気間隔を変
化させる事によって変倍を行うズームレンズにおいて、
広角端より望遠端へのズーミングに際し、第１群と第２
群の間の空気間隔が増大し、第３群と第４群の間の空気
間隔が減少する様に各群を移動させると共に、第３群中
に少なくとも１枚の非球面を有する正レンズと少なくと
も１枚の負レンズを有する事を特徴とするズームレン
ズ。5. A four-lens group consisting of a first group having a negative refractive power, a second group having a positive refractive power, a third group having a positive refractive power, and a fourth group having a negative refractive power in order from the object side. In a zoom lens that has a variable magnification by changing the air space between each group,
When zooming from the wide-angle end to the telephoto end, the first group and the second group
A positive lens having at least one aspherical surface in the third group while moving each group such that the air distance between the groups increases and the air distance between the third group and the fourth group decreases. A zoom lens having at least one negative lens.
を有する事を特徴とする請求項１項乃至５項記載のズー
ムレンズ。6. The zoom lens according to claim 1, wherein at least one aspherical surface is included in the third lens unit.
共、物体側へ移動する事を特徴とする請求項１項乃至５
項記載のズームレンズ。7. The first group to the fourth group move toward the object side together with the fourth group during zooming.
The zoom lens described in the item.
する請求項１項乃至５項記載のズームレンズ。8. The zoom lens according to claim 1, further comprising an aperture in the third lens unit.
ンズである事を特徴とする請求項１項乃至５項記載のズ
ームレンズ。9. The zoom lens according to claim 1, wherein the lens closest to the object side in the fourth group is a negative lens.
力が弱くなる非球面を有する負の単レンズにて構成され
る事を特徴とする請求項４項記載のズームレンズ。10. The zoom lens according to claim 4, wherein the fourth lens unit is composed of a negative single lens having an aspherical surface on the object side where the negative refractive power is weakened in the periphery.
件式を満足する事を特徴とする請求項１項乃至５項記載
のズームレンズ。 −３×１０-2＜ｈｈ3t／（ｆt −ｆw ）＜２×１０-2 但しｆw ；広角端における全系の焦点距離 ｆt ；望遠端における全系の焦点距離 ｈｈ3t；望遠端における第３群と第４群の主点間隔11. The zoom lens according to claim 1, wherein the following conditional expression is satisfied in the zoom lens. -3 × 10 -2 <hh 3t / (f t -f w) <2 × 10 -2 where f w; telephoto focal length hh 3t of the entire system at the telephoto end focal length f t of the entire system at the wide angle end Distance between principal points of the third and fourth groups at the edge
件式を満足する事を特徴とする請求項１項乃至５項記載
のズームレンズ。 ０．１＜（ｄ1t−ｄ1w）／ｆw ＜０．９ 但しｆw ；広角端における全系の焦点距離 ｄiw；広角端における第ｉ群と第ｉ＋１群の空気間隔 ｄit；望遠端における第ｉ群と第ｉ＋１群の空気間隔12. The zoom lens according to claim 1, wherein the following conditional expression is satisfied in the zoom lens. 0.1 <(d 1t -d 1w) / f w <0.9 where f w; i-th group at the wide-angle end and the (i + 1) group of air spacing d it;; telephoto focal length d iw of the entire system at the wide-angle end Air gap between the i-th group and the i + 1-th group at the edge
件式を満足する事を特徴とする請求項１項乃至５項記載
のズームレンズ。 ３．０×１０-3＜ｄ1w／ｆw ＜０．２ 但しｆw ；広角端における全系の焦点距離 ｄiw；広角端における第ｉ群と第ｉ＋１群の空気間隔13. The zoom lens according to claim 1, wherein the following conditional expression is satisfied in the zoom lens. 3.0 × 10 -3 <d 1w / f w <0.2 where f w; air gap of the i group and the (i + 1) group in a wide angle end focal length d iw of the entire system at the wide-angle end
件式を満足する事を特徴とする請求項１項乃至５項記載
のズームレンズ。 ３＜ｄ1t／ｄ1w＜５０ 但しｄiw；広角端における第ｉ群と第ｉ＋１群の空気間
隔 ｄit；望遠端における第ｉ群と第ｉ＋１群の空気間隔14. The zoom lens according to claim 1, wherein the following conditional expression is satisfied in the zoom lens. 3 <d 1t / d 1w <50 where d iw ; air distance between the i-th group and the i + 1-th group at the wide-angle end d it ; air distance between the i-th group and the i + 1-th group at the telephoto end
件式を満足する事を特徴とする請求項１項乃至５項記載
のズームレンズ。 ２＜ｄ2t／ｄ2w＜１０ 但しｄiw；広角端における第ｉ群と第ｉ＋１群の空気間
隔 ｄit；望遠端における第ｉ群と第ｉ＋１群の空気間隔15. The zoom lens according to claim 1, wherein the following conditional expression is satisfied in the zoom lens. 2 <d 2t / d 2w <10 where d iw ; air distance between the i-th group and the i + 1-th group at the wide-angle end d it ; air distance between the i-th group and the i + 1-th group at the telephoto end
件式を満足する事を特徴とする請求項１項乃至５項記載
のズームレンズ。 −９０＜ｆ1 ／ｆw ＜−３ 但しｆ1 ；第１群の焦点距離 ｆw ；広角端における全系の焦点距離16. The zoom lens according to claim 1, wherein the following conditional expression is satisfied in the zoom lens. -90 <f 1 / fw <-3 where f 1 ; focal length of first group fw ; focal length of entire system at wide-angle end
件式を満足する事を特徴とする請求項１項乃至５項記載
のズームレンズ。 −０．８＜ｆ4 ／ｆw ＜−０．３ 但しｆ4 ；第４群の焦点距離 ｆw ；広角端における全系の焦点距離17. The zoom lens according to claim 1, wherein the following conditional expression is satisfied in the zoom lens. Focal length of the entire system at the wide-angle end; -0.8 <f 4 / f w <-0.3 where f 4; focal length f w of the fourth group
式を満足する事を特徴とする請求項１項乃至５項記載の
ズームレンズ。 ２．０＜Ｂｅｔａ４ｔ／Ｂｅｔａ４ｗ＜５．０ 但しＢｅｔａ４ｗ；広角端における第４群の倍率 Ｂｅｔａ４ｔ；望遠端における第４群の倍率18. The zoom lens according to claim 1, wherein the following conditional expression is satisfied in the zoom lens. 2.0 <Beta4t / Beta4w <5.0 where Beta4w; magnification of fourth group at wide-angle end Beta4t; magnification of fourth group at telephoto end
おける軸外光線は最も像側レンズ面で最も高い位置を通
ることを特徴とする請求項１項乃至５項記載のズームレ
ンズ。19. The zoom lens according to claim 1, wherein in the zoom lens, an off-axis ray in a wide angle range passes through the highest position on the image side lens surface.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17850394A JP3167082B2 (en) | 1994-07-29 | 1994-07-29 | Zoom lens |
| TW084107418A TW319831B (en) | 1994-07-29 | 1995-07-18 | |
| US08/505,911 US5587840A (en) | 1994-07-29 | 1995-07-24 | Zoom lens |
| KR1019950023069A KR100216085B1 (en) | 1994-07-29 | 1995-07-29 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17850394A JP3167082B2 (en) | 1994-07-29 | 1994-07-29 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0843737A true JPH0843737A (en) | 1996-02-16 |
| JP3167082B2 JP3167082B2 (en) | 2001-05-14 |
Family
ID=16049608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17850394A Expired - Fee Related JP3167082B2 (en) | 1994-07-29 | 1994-07-29 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3167082B2 (en) |
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| JP2021009334A (en) * | 2019-06-30 | 2021-01-28 | エーエーシー オプティックス ソリューションズ ピーティーイー リミテッド | Image capturing optical lens |
| JP2021189416A (en) * | 2020-05-27 | 2021-12-13 | エーエーシー オプティックス ソリューションズ ピーティーイー リミテッド | Imaging optical lens |
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| JP3167082B2 (en) | 2001-05-14 |
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