JPS5928121A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPS5928121A JPS5928121A JP57137061A JP13706182A JPS5928121A JP S5928121 A JPS5928121 A JP S5928121A JP 57137061 A JP57137061 A JP 57137061A JP 13706182 A JP13706182 A JP 13706182A JP S5928121 A JPS5928121 A JP S5928121A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- lenses
- focusing
- zoom
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
-
- 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
- G02B15/1441—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 positive
- G02B15/144113—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 positive arranged +-++
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はズームレンズに関し、特に８ミリシネカメラあ
るいはビデオカメラ等に適したコンパクトな高変倍のズ
ームレンズに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zoom lens, and more particularly to a compact, high-power zoom lens suitable for an 8 mm cine camera or video camera.
従来より高変倍化を行ったズームレンズの多くは、いわ
ゆる４群ズームタイプといわれるズームタイプを採用し
、そのレンズ構成は収差補正上よシ物体側より順にフォ
ーカシング用の第ルンズ群、変倍機能を有する第２レン
ズ群、変倍により変動する像面を補正する為の第３レン
ズ群、セして結偉機能を有する第４レンズ群の４つのレ
ンズ群より構成されていた。このような第ルンズ群を移
動させて７オーカシングを行うレンズ構成のズームレン
ズは、第ルンズ群のレンズ外径が大きくなる傾向があり
、又物体距離の変動による収差変動が大きく、このとき
の収差変動を少なくする為に第ｌレンズ群のレンズ構成
を３枚以上のレンズで構成する必要があった。Many conventional zoom lenses with high zoom ratios adopt the so-called 4-group zoom type, and the lens configuration is to correct aberrations, and in order from the object side, there is a focusing lens group, and a zoom lens group for zooming. It consisted of four lens groups: a second lens group with a function, a third lens group to correct the image plane that changes due to zooming, and a fourth lens group with a centering function. In a zoom lens with such a lens configuration that performs 7 focusing by moving the lens group, the lens outer diameter of the lens group tends to be large, and the aberration fluctuations due to changes in object distance are large, and the aberrations at this time In order to reduce fluctuations, it was necessary to configure the lens configuration of the first lens group with three or more lenses.
この為に、ズームレンズ全体が増々大きくなる傾向があ
り、ズームレンズのコンパクト化カ困難になっていた。For this reason, the entire zoom lens tends to become larger and larger, making it difficult to make the zoom lens more compact.
本発明は、高変倍でしかも良好に収差補正を行なったコ
ンパクトなズームレンズの提供を目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a compact zoom lens with a high zoom ratio and excellent aberration correction.
本発明の目的を達成する為のレンズ構成の特徴は、物体
側よシ順に正の屈折力の第ｌレンズ群、負の屈折力の第
２レンズ群、正又は負の屈折力の第３．第４レンズ群の
４つのレンズ群を有し。The features of the lens configuration for achieving the object of the present invention include, in order from the object side, a first lens group with a positive refractive power, a second lens group with a negative refractive power, a third lens group with a positive or negative refractive power, and a third lens group with a positive or negative refractive power. It has four lens groups: a fourth lens group.
７前記、第１．第２．第３レンズ群の各々のレンズ群の
空気間隔を変えてズーミングを行うズームレンズにおい
て。7 above, 1st. Second. In a zoom lens that performs zooming by changing the air distance between each lens group of the third lens group.
前記第ｌレンズ群を２枚のレンズで構成し。The first lens group is composed of two lenses.
前記第２レンズ以降のレンズ群の一部若しくは全部を移
動させて７オーカシングをする事でめる〇
一般に４群ズームタイプのズームレンズに３いて
第ｌレンズ群でフォーカシングを行なう際、フォーカシ
ングにより収差変動がなるべく生じないように、第ルン
ズ群内で収差補正を良好に行なっておく必要がある。一
方１本発明のように第ｌレンズ群より後方のレンズ群で
フォーカシングを行なう場合には、レンズ全体として収
差補正を考えればよい為１％に第ルンズ群内で収差補正
を行なっておく必要がない。すなわち、変倍により移動
するレンズ群間で各々良好に収差補正を達成するような
レンズ構成であればよく、この為１本発明のように第１
レンズ群を２枚のレンズで構成しても良好に収差補正を
達成することが可能となるのでるる。This can be achieved by moving some or all of the lens groups after the second lens to perform focusing. In general, when focusing with the first lens group in a four-group zoom type zoom lens, focusing causes aberrations. In order to prevent fluctuations as much as possible, it is necessary to properly correct aberrations within the lens group. On the other hand, when focusing is performed in a lens group behind the first lens group as in the present invention, it is only necessary to consider aberration correction for the lens as a whole, so it is necessary to perform aberration correction within the first lens group. do not have. In other words, it is sufficient to have a lens configuration that can satisfactorily correct aberrations between the lens groups that move due to zooming.
Even if the lens group is composed of two lenses, it is possible to achieve good aberration correction.
更に本発明において、より良好なる収差補正を行なうに
は。Furthermore, in the present invention, in order to perform better aberration correction.
第ｌレンズ群を物体側に凸面を向けた負の屈折力のメニ
スカス状の第１．レンズと両しンズ曲が凸面の正の屈折
力の第１ｔレンズより構成するのが好ましい。The first lens group has a meniscus shape with a negative refractive power and has a convex surface facing the object side. Preferably, the lens and the double lens are constituted by a first t lens having a convex surface and a positive refractive power.
第ｌレンズ群を負と正の屈折力の２秋のレンズで構成す
ることによりズーミングによる色収差の補正を良好に行
ない、又１両レンズを上述のようなレンズ形状とするこ
とにより、望遠端のズーム位置での球面収差を良好に補
正している。By configuring the first lens group with two lenses with negative and positive refractive powers, chromatic aberration due to zooming can be well corrected, and by making both lenses have the above-mentioned lens shape, the telephoto end Spherical aberration at the zoom position is well corrected.
又、第２レンズ群に所定の負の屈折力を与え変倍作用を
効率良く行なう為、第２レンズ群を２枚の負の屈折力の
レンズで構成し、更に第ルンズ群、第３レンズ群と共に
ズーミングによって移動させてズーミングによる収差変
動を少なくしている。In addition, in order to provide a predetermined negative refractive power to the second lens group and perform magnification change efficiently, the second lens group is composed of two lenses with negative refractive power, and a third lens group and a third lens group are used. It is moved together with the lens group during zooming to reduce fluctuations in aberrations caused by zooming.
このように第１．第２．第３レンズ群の３つのレンズ群
間の空気間隔を変えてズーミングを行なうことにより５
合成のレンズ系として収差補正が行なえる為に第２レン
ズ群を２枚のレンズで構成することができ、ズームレン
ズのコンパクト化がより−ノー、可能となる。In this way, the first. Second. By performing zooming by changing the air distance between the three lens groups of the third lens group,
Since aberrations can be corrected as a composite lens system, the second lens group can be composed of two lenses, making it possible to make the zoom lens more compact.
そして本発明に係るズームレンズでは。And in the zoom lens according to the present invention.
第４レンズ群を４枚のレンズで構成し、最も像面側に正
の屈折力の第４４レンズを配置し、前記第４．レンズを
移動させてフォーカシングを行ナウことにより、フォー
カシングによる収差変動をなるべく少なくしている。The fourth lens group is composed of four lenses, with a 44th lens having a positive refractive power disposed closest to the image plane, and the fourth lens group having a positive refractive power. By moving the lens and performing focusing, aberration fluctuations due to focusing are minimized.
特に、第４４レンズにある程度の屈折力を与えることに
より、フォーカシングによるレンズの繰り出し移動量全
適正なる値に保っている。In particular, by giving a certain degree of refractive power to the 44th lens, the entire amount of movement of the lens during focusing is kept at an appropriate value.
又、第４レンズ群の物体側の３つのレンズを共に物体側
に凸面を向けたメニスカスの形状とすることにより、全
ズーム範囲にわたり収差補正を良好に行なっている。特
に画面周辺の非点収面
差と大口径比化に伴う高次の球明収差金良好に補正して
いる。Furthermore, by forming the three lenses on the object side of the fourth lens group into meniscus shapes with convex surfaces facing the object side, aberrations can be corrected well over the entire zoom range. In particular, astigmatic aberrations around the screen and high-order spherical aberrations associated with larger aperture ratios are effectively corrected.
次に本発明の実施例のズームレンズのレンズ断面図を第
１図に示す。第２図に本発明の実施例のズームレンズの
ズーミングによる移動軌跡の概略図管示す０第２図に示
すようｐｃ本発明のズームレンズｔよ、第１，２．３レ
ンズ群ヲ移動させてズーミングを行ない、第４レンズ群
で紹１＊ ｋ行なうレンズ構成となっており、焦点合せ
は第４レンズ群の最終レンズである第４４レンズケ移動
させることによって行なっている。従来のように第ルン
ズ群を移動させることによって焦点合せを行なうと、第
３図に示すように画面周辺に結像する斜光束をレンズ繰
出時にも確保する為にレンズ径を大きくする必要があっ
たが、本発明では第４４レンズを移動させてフォーカシ
ングを行なっている為、第ルンズ群のレンズ外径の縮小
化が容易に行なえる０
そして、ズーミングによる収差変動を第ルンズ群とそれ
以降のレンズ群の合成系で行なっている為に、第１レン
ズ群が２枚のレンズであっても良好なる収差補正が達成
できるのでめる。Next, FIG. 1 shows a lens sectional view of a zoom lens according to an embodiment of the present invention. FIG. 2 shows a schematic diagram of the movement locus of the zoom lens according to the embodiment of the present invention during zooming.As shown in FIG. The lens structure is such that zooming is performed and the fourth lens group performs zooming, and focusing is performed by moving the 44th lens, which is the final lens of the fourth lens group. If focusing is performed by moving the lens group as in the past, it is necessary to increase the diameter of the lens in order to secure the oblique light beam that forms an image around the screen, even when the lens is extended, as shown in Figure 3. However, in the present invention, since focusing is performed by moving the 44th lens, the outer diameter of the lens of the 44th lens group can be easily reduced. Since this is done using a composite system of lens groups, good aberration correction can be achieved even if the first lens group is made up of two lenses.
又、第３レンズｍ−＋貼合わせレンズを含む３枚のレン
ズで構成し、ズーミングの際、移動させることによって
変倍効果を付与しクク、ズーミングによる収差変動を良
好に補正している０向１本発明のズームレンズでは、第
１．第２゜第３レンズ群の各々の１つのレンズ向を非球
面とすることにより、ズーミングによる収差変動を少な
くシ、より良好なる収差補正を行なっている。In addition, it is composed of three lenses including the third lens m-+ laminated lens, and when zooming, by moving it, it gives a variable magnification effect, and the 0-direction lens that effectively corrects aberration fluctuations due to zooming. 1. In the zoom lens of the present invention, 1. By making one lens in each of the second and third lens groups aspherical, fluctuations in aberrations due to zooming are reduced and aberrations are better corrected.
次に本発明の数値実施例を示す。数値実施ｐｔ＋におい
てＲｉは物体１１すより順に第ｉ番目のレンズ面の曲率
半径、Ｄｉは物体側より順に第ｉ番目のレンズ厚及び空
気間隔、Ｎ量とνｉは夫々物体側より＋ａ Ｋ 第ｒ番
目のレンズのガラスの屈折率とアツベ数である。Next, numerical examples of the present invention will be shown. In the numerical implementation pt+, Ri is the radius of curvature of the i-th lens surface in order from the object side, Di is the thickness and air distance of the i-th lens in order from the object side, and the amount of N and νi are +a K rth from the object side, respectively. These are the refractive index and Atsube number of the glass of the th lens.
また、Ｂ、 Ｃは非球面のレンズ面形状をＸ＝Ｒ（ｌ−
（１一旦辻） ＋ Ｈ）ｌ’＋ ＣＨｂで表現した時の
非球面係数である。但し、 Ｘ＋よレンズ面頂点基準に
おけろ光軸方向の面の変位、Ｈは光軸からの高さ、Ｒは
基準球面の曲率半径である。In addition, B and C represent the aspherical lens surface shape as X=R(l−
(1 Tsuji) + H) l' + This is the aspherical coefficient when expressed as CHb. However, X+ is the displacement of the surface in the optical axis direction with reference to the apex of the lens surface, H is the height from the optical axis, and R is the radius of curvature of the reference spherical surface.
数頃実側１
Ｆ−１，００〜５．７０ ＦＮＯ−１：１．４ ２＃
−５２，０〜９．７８゜Ｒｌ−１４，７１３Ｄ Ｉ−
０，２２２Ｎ １−１．７１７３６ シ１１−１
９．５ＰＬ ２− ６．３８７ Ｄ ２−０．
０１８）Ｌ３− ３．６８５ Ｄ３曽１．２４２
Ｎ２匍１，４９１７１ ν ２−５７．４＊
ｌＬ ４− −４．４３４ Ｄ ４自 可変Ｉｔ
５− −７．６５０ Ｄ ５−α１０６ Ｎ
３−１．４９１７１ シ、３−５７．４＊）ｔ
６− １．４５４ Ｄ ６−０．４６１Ｒ７
−−１，８９０Ｄ ７會０．１０６ Ｎ ４−
１．４９１７１ シ、４−５７．４）ｔ ８− ２
７．６０２ Ｄ ８− 可変＊Ｒ９−９，７２６Ｄ
９−０．１０６ Ｎ ５−１．８０５１８
シ、５會２５．４ル１０− ２．６５５ Ｄ
ＩＯ−０，３５５Ｎ ６曽１．６０７２９ ν ６
−５９．４Ｒ１１−−３６，７５２Ｄｌｌ曽ｏ、ｏｔｓ
Ｒ１２−３，１６５Ｄｉ２−０．５３２ Ｎ ７
曽１，６０７２９ シ、７−５９．４Ｒ１４−（絞
） −Ｄｉ４−０．０８９Ｒ１５−１，１７０Ｄｉ５−
０．１９５ Ｎ ８−１．６５１６０ ν
ｇ−５８，６ル１６− １．４１９ Ｄｉ６−０
．０１３）ｔ１７− ０．８５６ Ｄｉ７−０．
３５５ Ｎ ９−１．６０３１１ ｋＴ＋９−
６０．フル１８− ０．６８６ Ｄｉ８−０．１
６０ＲＩ９− Ｌ ２９０ Ｄｉ９−０．０８
９ Ｎｌ０−１．８４６６６ シ１０−２３．
９ル２０− ０．６８２ Ｄ２０量０．６６２Ｒ
２１−１，３６２Ｄ２１−０．３５５ Ｎｌｌ自１
．６９６８０ シ１１−５５．５Ｒ２２−−３，４
９６
ネ印非球面
Ａｈ画面数
旧抽
了で「
本発明の一実施例として、第ルンズ群をズーミングの際
、移動させるズームタイプを挙げたが、ズーミングの際
第ルンズ群を固定し。Real side 1 F-1,00~5.70 FNO-1: 1.4 2#
-52,0~9.78゜Rl-14,713D I-
0,222N 1-1.71736 11-1
9.5PL 2- 6.387 D 2-0.
018) L3- 3.685 D3 So 1.242
N2 liter 1,49171 ν 2-57.4*
lL 4- -4.434 D 4 auto variable It
5- -7.650 D 5-α106 N
3-1.49171 shi, 3-57.4*)t
6-1.454 D 6-0.461R7
--1,890D 7 meetings 0.106N 4-
1.49171 shi, 4-57.4)t 8-2
7.602 D 8- Variable *R9-9,726D
9-0.106 N 5-1.80518
5 meetings 25.4 10-2.655 D
IO-0,355N 6so1.60729 ν 6
-59.4R11--36,752Dllso,ots
R12-3,165Di2-0.532N 7
So 1,60729 shi, 7-59.4R14- (aperture) -Di4-0.089R15-1,170Di5-
0.195 N 8-1.65160 ν
g-58,6 le 16- 1.419 Di6-0
．． 013) t17- 0.856 Di7-0.
355 N 9-1.60311 kT+9-
60. Full 18-0.686 Di8-0.1
60RI9-L 290 Di9-0.08
9 Nl0-1.84666 C10-23.
9 Ru 20- 0.682 D20 amount 0.662R
21-1,362D21-0.355 Nll self 1
．． 69680 Shi11-55.5R22--3,4
96 Aspherical surface Ah Number of screens Previously drawn, ``As an embodiment of the present invention, a zoom type in which the 1st lens group is moved during zooming was mentioned, but it is also possible to fix the 1st lens group during zooming.
第２レンズ以降の正または負の屈街力のレンズ群を往復
運動させて行なうズームタイプについても本発明は同様
に適用でき、第ｉｔ／ンズ胛以外で焦点合せを行なうこ
とにより、第ルンズ群のレンズ構成な簡単にできる。The present invention can be similarly applied to a zoom type in which a lens group having a positive or negative optical power after the second lens is reciprocated. The lens configuration can be easily done.
さらに本発明の一実施例では、焦点合せを最終レンズ群
の１都を移動させて行なったが、上述の実施例以外の他
のズームタイプを選べば、第２レンズ以降のレンズ群の
全部おるいは１部を移動させることにより焦点合せを行
なうことができる。Furthermore, in one embodiment of the present invention, focusing was performed by moving one of the final lens groups, but if a zoom type other than the above-mentioned embodiment is selected, all of the lens groups after the second lens can be adjusted. Focusing can be achieved by moving one part or the other.
例えば第２レンズ群若しくは第３レンズ群の一部、若し
くは全部のレンズ群を移動させてフォーカシングをして
もよい。For example, focusing may be performed by moving some or all of the second lens group or the third lens group.
以上、説明したように本発明によれば高変倍のズームレ
ンズにおいて、最も大型化しやすいさくできるのでズー
ムレンズのコンパクト化に効果がある。更にＷＪｌレン
ズ群のレンズ構成が簡単であるため、コンパクト化と共
にコスト低減の効果がある。As described above, according to the present invention, in a zoom lens with a high zoom ratio, it is possible to easily increase the size of the zoom lens, which is effective in making the zoom lens compact. Furthermore, since the lens structure of the WJl lens group is simple, it is possible to reduce the size and cost.
第１図は本発明の実施的のズームレンズのレンズ断面図
、第２図は本発明の実施例のズーミングにおけるレンズ
の移動軌跡を示す説明図。
第３図は第ルンズ群を焦点合せに使用する際の繰ｐ出し
前と繰り出した場合でレンズ外径が異なることを示す説
明図、第４．５図は本発明の実施例の縦収差を示す図、
但し第４図は物体距離ψ、第５図は物体距離−１３３に
おける収差図である。第４．第５図中（ａ）は広角端、
（ｂ）は中間焦点距Ｍ、ＣＣ）は望遠端であることを示
す。ΔＳはサジタル像面、ΔＭはメｙデイオオル像面で
−ある。
特許出願人 キャノン株式会社
代理人 丸島眼（１丁２FIG. 1 is a cross-sectional view of a zoom lens according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a movement locus of the lens during zooming according to an embodiment of the present invention. Fig. 3 is an explanatory diagram showing that the lens outer diameter differs between before and after the lens group is extended when used for focusing, and Fig. 4.5 shows the longitudinal aberration of an example of the present invention. diagram showing,
However, FIG. 4 is an aberration diagram at an object distance ψ, and FIG. 5 is an aberration diagram at an object distance of -133. 4th. In Fig. 5, (a) is at the wide-angle end;
(b) shows that the intermediate focal length M, CC) is at the telephoto end. ΔS is a sagittal image plane, and ΔM is a medial image plane. Patent Applicant Canon Co., Ltd. Agent Gen Marushima (1-2
Claims (1)
第４レンズ群の４つのレンズ群を有し。 前記第１．第２％第３レンズ群の各々のレンズ群の空気
間隔を変えてズーミングを行うズームレンズにおいて、 前記第ルンズ群を２枚のレンズで構成し、約記第２レン
ズ以降のレンズ群の一部若しくは全部を移動させてフォ
ーカシングｔする事を特徴とするズームレンズ。 （２） 前記第ルンズ群を物体側に凸面を向けた負の
屈折力のメニスカス状の第１．レンズと両レンズ面が凸
面の正の屈折力の第１．レンズより構成したことを特徴
とする特許請求の範囲第１項記載のズームレンズ。 （８） 前記第４レンズ群を４枚のレンズで構成し、
最も像面側に正の屈折力の第ζレンズを配置し、 前記第４４レンズを移動させてフォーカシングを行う事
を特徴とする特許請求の範囲第２項記載のズームレンズ
。[Claims] (1) A lens group having positive refractive power in order from the object side. a second lens group with negative refractive power; a third lens group with positive or negative refractive power;
It has four lens groups: a fourth lens group. Said 1st. 2% In a zoom lens that performs zooming by changing the air spacing of each lens group of the third lens group, the third lens group is composed of two lenses, and a part of the lens group after the second lens. Or a zoom lens that is characterized by focusing by moving the entire lens. (2) The first lens group has a meniscus shape with a negative refractive power and has a convex surface facing the object side. The first lens and both lens surfaces are convex and have positive refractive power. The zoom lens according to claim 1, characterized in that it is constituted by a lens. (8) The fourth lens group is composed of four lenses,
3. The zoom lens according to claim 2, wherein a ζ-th lens with a positive refractive power is disposed closest to the image plane side, and focusing is performed by moving the 44th lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57137061A JPS5928121A (en) | 1982-08-06 | 1982-08-06 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57137061A JPS5928121A (en) | 1982-08-06 | 1982-08-06 | Zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5928121A true JPS5928121A (en) | 1984-02-14 |
Family
ID=15189974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57137061A Pending JPS5928121A (en) | 1982-08-06 | 1982-08-06 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5928121A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6491110A (en) * | 1987-10-02 | 1989-04-10 | Olympus Optical Co | Zoom lens |
| JPH01105212A (en) * | 1986-10-24 | 1989-04-21 | Asahi Optical Co Ltd | Macro-system for high variable power zoom lens including wide angle |
| US5257135A (en) * | 1990-10-02 | 1993-10-26 | Minolta Camera Kabushiki Kaisha | Compact zoom lens system |
| EP1418453A1 (en) * | 2002-10-23 | 2004-05-12 | Zeiss Optronik GmbH | Zoom lens |
-
1982
- 1982-08-06 JP JP57137061A patent/JPS5928121A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01105212A (en) * | 1986-10-24 | 1989-04-21 | Asahi Optical Co Ltd | Macro-system for high variable power zoom lens including wide angle |
| JPS6491110A (en) * | 1987-10-02 | 1989-04-10 | Olympus Optical Co | Zoom lens |
| US5257135A (en) * | 1990-10-02 | 1993-10-26 | Minolta Camera Kabushiki Kaisha | Compact zoom lens system |
| EP1418453A1 (en) * | 2002-10-23 | 2004-05-12 | Zeiss Optronik GmbH | Zoom lens |
| US6856468B2 (en) | 2002-10-23 | 2005-02-15 | Zeiss Optronik Gmbh | Zoom lens |
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