JP2984424B2 - Zoom lens - Google Patents

Zoom lens

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Publication number
JP2984424B2
JP2984424B2 JP3194116A JP19411691A JP2984424B2 JP 2984424 B2 JP2984424 B2 JP 2984424B2 JP 3194116 A JP3194116 A JP 3194116A JP 19411691 A JP19411691 A JP 19411691A JP 2984424 B2 JP2984424 B2 JP 2984424B2
Authority
JP
Japan
Prior art keywords
lens
group
wide
lens group
distance
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.)
Expired - Fee Related
Application number
JP3194116A
Other languages
Japanese (ja)
Other versions
JPH0534596A (en
Inventor
章市 山崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP3194116A priority Critical patent/JP2984424B2/en
Publication of JPH0534596A publication Critical patent/JPH0534596A/en
Application granted granted Critical
Publication of JP2984424B2 publication Critical patent/JP2984424B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明はズームレンズ、特にCR
Tまたは液晶表示器の画像を投影するプロジェクション
用に好適なズームレンズに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens,
The present invention relates to a zoom lens suitable for projection for projecting an image of a T or a liquid crystal display.

【0002】[0002]

【従来の技術】まず、図11に一般的なカラー液晶に形
成された像を投影するプロジェクションテレビの構成図
を示す。1は白色光源でコリメートされた光を射出す
る。2(2a,2b,2c)は液晶表示素子、3(3
a,3b)は反射ミラー、4,5,6はそれぞれ赤反射
ダイクロイックミラー、緑反射ダイクロイックミラー、
青反射ダイクロイックミラー、7は投影レンズである。
こういった構成のもとでは、投影レンズの最終面から液
晶表示素子までの間(バックフォーカス間)に反射ミラ
ーあるいはダイクロイックミラー等の少なくとも2枚の
ミラーを配置する必要から、どうしても長いバックフォ
ーカスを確保しなければならない。
2. Description of the Related Art First, FIG. 11 shows a configuration diagram of a projection television for projecting an image formed on a general color liquid crystal. 1 emits light collimated by a white light source. 2 (2a, 2b, 2c) is a liquid crystal display element and 3 (3
a, 3b) are reflection mirrors, 4, 5, and 6 are red reflection dichroic mirrors, green reflection dichroic mirrors, respectively.
A blue reflection dichroic mirror 7 is a projection lens.
Under such a configuration, at least two mirrors such as a reflection mirror or a dichroic mirror need to be disposed between the final surface of the projection lens and the liquid crystal display element (between the back focuses). Must be secured.

【0003】このような液晶プロジェクター用レンズと
しては、特開平3−120507号等がしられている。
だが近年、液晶サイズ及びダイクロイックミラー等のコ
ンパクトが進み、それにそってバックフォーカスを従来
に比してやや短くできることが望ましい。また投影距離
を短縮化しても、高品位テレビ技術に対処できる程度の
性能を持つことが望ましい。
As such a lens for a liquid crystal projector, Japanese Patent Application Laid-Open No. 3-120507 has been proposed.
However, in recent years, the liquid crystal size and the compactness of dichroic mirrors and the like have been advanced, and it is desirable that the back focus can be shortened slightly as compared with the conventional one. Even if the projection distance is shortened, it is desirable to have performance enough to cope with high-definition television technology.

【0004】[0004]

【発明が解決しようとする課題】本発明は上述の要望に
鑑み所望のバックフォーカスを確保できる一方、良好な
画質を満足するより安価な変倍レンズの提供を目的とす
る。
SUMMARY OF THE INVENTION It is an object of the present invention to provide a more inexpensive zoom lens which can secure a desired back focus while satisfying good image quality.

【0005】[0005]

【課題を解決するための手段】本発明は、大きな共役側
から順に負の屈折力を有する第1レンズ群、正の屈折
力を有する第2レンズ群の2つのレンズ群によって構成
され、広角側から望遠側へのズーミングに際して前記第
2レンズ群を大きな共役側へ移動させるズームレンズで
あって、以下(1)から(7)式を同時に満足する。 1.25<bfw/fw< 1.6 …(1) −1.2 <f1/fw < −0.6 …(2) 0.5 <f2/fw < 0.9 …(3) 0.3 <ew/fw < 0.8 …(4)0.3 <f 2 /f 2a < 0.7 …(5) 0.5 <f 2 /f 2b < 0.8 …(6) 0.35<e 2 /f 2 < 0.7 …(7)
Means for Solving the Problems The present invention is composed of the large conjugate side in this order, a first lens group having negative refractive power, the two lens groups of the second lens group having a positive refractive power
This zoom lens moves the second lens group to a large conjugate side during zooming from the wide-angle side to the telephoto side, and satisfies the following expressions (1) to (7) simultaneously . 1.25 <bfw / fw <1.6 ... (1) -1.2 <f 1 / fw <-0.6 ... (2) 0.5 <f 2 / fw <0.9 ... (3) 0 .3 <ew / fw <0.8 ... (4) 0.3 <f 2 / f 2a <0.7 ... (5) 0.5 <f 2 / f 2b <0.8 ... (6) 0. 35 <e 2 / f 2 <0.7 (7)

【0006】但し、広角端における前記第2レンズ群の
最終レンズから小さな共役までの距離をbfw、広角端
における全系の焦点距離をfw、前記第1群と第2群の
焦点距離をf1、f2、前記第1レンズ群と第2レンズ群
との主点間隔をew、前記第2レンズ群中の空気間隔が
最大となる部分を境に分割した大きな共役側の前群の焦
点距離をf 2a 、小さな共役側の後群の焦点距離をf 2b
その主点間隔をe 2 とする。
However, the distance from the final lens of the second lens group to the small conjugate at the wide-angle end is bfw, the focal length of the entire system at the wide-angle end is fw, and the focal length of the first and second groups is f 1. , F 2 , the distance between the principal points between the first lens group and the second lens group is ew , and the air distance between the second lens group is
The focus of the front group on the large conjugate side divided at the maximum
The point distance is f 2a , the focal length of the rear group on the small conjugate side is f 2b ,
Let the principal point interval be e 2 .

【0007】[0007]

【実施例】図1から図3は、後述する本発明の数値実施
例に対応するレンズ断面図である。
1 to 3 are lens sectional views corresponding to numerical examples of the present invention described later.

【0008】1は不図示のスクリーン(大きな共役)側
に位置し負の屈折力を有する第1レンズ群、2は不図示
の液晶等の原画像(小さな共役)側に位置し正の屈折力
を有する第2レンズ群で、広角側から望遠側へのズーミ
ングに際して実線で示す通りの移動軌跡に従って移動、
特に第2レンズ群がスクリーン側へ移動している。尚、
Wはワイド端、Mは中間、Tはテレ端を各々示してい
る。
Reference numeral 1 denotes a first lens unit having a negative refractive power and located on a screen (large conjugate) side (not shown), and has a positive refractive power and located on an original image (small conjugate) side of liquid crystal and the like (not shown). The second lens group having the following movement during zooming from the wide-angle side to the telephoto side according to the movement locus indicated by the solid line,
In particular, the second lens group moves to the screen side. still,
W indicates the wide end, M indicates the middle, and T indicates the tele end.

【0009】上述した条件式の極値の意味を以下説明す
る。条件式(1)はバックフォーカスに関する式であ
る。下限を越えるとバックフォーカスが短くなり過ぎダ
イクロイックミラーにぶつかる危険がある。上限を越え
るとバックフォーカスが長くなり、レンズ系が大きく成
る難点があり、コストダウンにも不利である。条件式
(2),(3),(4)は夫々パワー配置の条件式であ
る。(2)の下限値、(3)の上限値、(4)の上限値
を越えた時は、各群のパワーが弱くかつ主点間隔が長く
なり、レンズ系、特に前玉が大きくなりコストが高く成
るうえ、さらにワイドで倍率(縮少側)3/100を得
るための投影距離が長くなる。逆に(2)の上限値、
(3)の下限値、(4)の下限値を越えるとコンパクト
になりコストダウン可能であるが、各群のパワーが強す
ぎT側では非点収差、Wでは歪曲収差及び倍率色収差の
補正が困難となる。
The meaning of the extremum in the above conditional expression will be described below. Conditional expression (1) is an expression relating to the back focus. If the lower limit is exceeded, the back focus becomes too short and there is a risk of hitting the dichroic mirror. If the upper limit is exceeded, the back focus becomes longer, the lens system becomes larger, and there is a disadvantage in cost reduction. Conditional expressions (2), (3), and (4) are conditional expressions for the power allocation, respectively. When the lower limit of (2), the upper limit of (3), and the upper limit of (4) are exceeded, the power of each group is weak and the interval between the principal points is long, and the lens system, especially the front lens, becomes large, resulting in cost. Is increased, and the projection distance for obtaining a magnification (reduction side) of 3/100 is widened further. Conversely, the upper limit of (2),
If the lower limit of (3) is exceeded and the lower limit of (4) is exceeded, the size becomes compact and the cost can be reduced. However, the power of each group is too strong, and astigmatism is corrected on the T side, and distortion and lateral chromatic aberration are corrected for W. It will be difficult.

【0010】[0010]

【0011】また、条件式(5)の下限値、(6)の上
限値、(7)式の上限値を越えると全体として第2群の
主点の位置が像側(共役長の短い側)に移動するのでバ
ックフォーカスを長くすることができるが、テレ側で第
1群と第2群が干渉してしまい、通常の倍率を得る事は
物理的に成り立たなくなってしまう。また(5)の上限
値、(6)の下限値、(7)の下限値を越えると前群の
パワーが強くなりワイドとテレの球面収差を満足させる
ことが難しくなる。また、液晶プロジェクターレンズの
場合、液晶面に対しテレセントリック光学系にすること
が望ましいが、極値を越えると軸外光線の液晶に対する
入射角度が大きくなりすぎて性能上良くない。
[0011] The lower limit of the condition (5), the upper limit value, (7) a short side of the image side (conjugate length position of the principal point of the second group as a whole exceeds the upper limit of expression (6) ), The back focus can be lengthened, but the first and second units interfere on the telephoto side, and it becomes physically impossible to obtain a normal magnification. If the upper limit of (5), the lower limit of (6), or the lower limit of (7) is exceeded, the power of the front group becomes strong, and it becomes difficult to satisfy the spherical aberration of wide and tele. In the case of a liquid crystal projector lens, it is desirable to use a telecentric optical system with respect to the liquid crystal surface. However, if the value exceeds an extreme value, the angle of incidence of off-axis rays on the liquid crystal becomes too large, which is not good in performance.

【0012】加えて第1群の負の屈折力の最も強いレン
ズの前面の半径をR1f、表示器側の面をR1r、第2群中
負の屈折力の最も強いレンズの前面の半径をR2f、表示
器側の面をR2rとした時、 −0.5<R1f/R1r<0.1…(8) −1<R2f/R2r<0.15…(9) を考慮するとよい。条件式(8)の上限を越えるとスク
リーン像の曲率がゆるく後面の曲率が強くなり、高次の
コマ収差がテレ側でアンダーに大きく発生してしまう。
In addition, the radius of the front surface of the lens having the strongest negative refractive power in the first group is R 1f , the surface on the display side is R 1r , the radius of the front surface of the lens having the strongest negative refractive power in the second group. Where R 2f and R 2r on the display side, −0.5 <R 1f / R 1r <0.1 (8) −1 <R 2f / R 2r <0.15 (9) Should be considered. When the value exceeds the upper limit of conditional expression (8), the curvature of the screen image becomes loose and the curvature of the rear surface becomes strong, so that high-order coma aberration largely occurs under the telephoto side.

【0013】下限を越えると非点収差がワイド側でオー
バーに発生して補正困難になり易い。条件式(9)の上
限を越えると前面が強く後面が緩くなり、ワイドとテレ
の両側での高次の球面収差の変動が大きくなりすぎる。
下限を越えた時は、像高が大きな付近で非点収差曲線が
アンダーに倒れすぎる。
If the lower limit is exceeded, astigmatism will occur excessively on the wide side and correction will be difficult. If the upper limit of conditional expression (9) is exceeded, the front surface becomes strong and the rear surface becomes loose, and the fluctuation of high-order spherical aberration on both sides of wide and tele becomes excessively large.
If the lower limit is exceeded, the astigmatism curve will fall too low under the vicinity of a large image height.

【0014】また実施例の第1群のレンズ構成として
は、物体側より像側に強い曲率の凸レンズ、物体側へ凸
を向いた負のメニスカスレンズ、両凹レンズ、物体側に
強い曲率をもつ凸レンズに配置することにより歪曲収
差、非点収差、コマ収差を良好に補正できる。また、物
体側より物体側へ凸を向いた負のメニスカスレンズ、両
凹レンズ、物体側に強い曲率をもつ凸レンズと配置して
も歪曲収差がやや大きくなるが、1枚レンズを減らすこ
とができるのでよい。第2群のレンズ構成は、前群が物
体側より凸レンズ、像側に向いた負のメニスカスレン
ズ、後群が物体側より凹レンズ、像側に強い曲率をもつ
凸レンズ、凸レンズと配置することにより、非点収差、
コマ収差、球面収差を良好に補正できる。
The first lens unit in the embodiment includes a convex lens having a stronger curvature on the image side than the object side, a negative meniscus lens convex toward the object side, a biconcave lens, and a convex lens having a strong curvature on the object side. , Distortion, astigmatism, and coma can be satisfactorily corrected. Even if a negative meniscus lens that is convex toward the object side from the object side, a biconcave lens, and a convex lens that has a strong curvature on the object side, distortion becomes slightly larger, but one lens can be reduced. Good. The lens configuration of the second group is such that the front group has a convex lens from the object side, a negative meniscus lens facing the image side, the rear group has a concave lens from the object side, a convex lens having a strong curvature on the image side, and a convex lens. Astigmatism,
Coma and spherical aberrations can be corrected well.

【0015】第1、2群ともに負レンズを2枚ずつ使用
することにより、諸収差をバランスよく補正できる。
By using two negative lenses in each of the first and second units, various aberrations can be corrected in a well-balanced manner.

【0016】次に本発明の数値実施例を示す。数値実施
例においてriはスクリーン側より順に第i番目のレン
ズ面の曲率半径、diはスクリーンより順に第i番目の
レンズ厚及び空気間隔、niとνiは夫々スクリーン側
より順に第i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 described. In the numerical examples, ri is the radius of curvature of the i-th lens surface in order from the screen side, di is the i-th lens thickness and air gap in order from the screen, and ni and νi are the i-th lens surfaces in order from the screen side. These are the refractive index and the Atsube number of glass.

【0017】尚、実施例1〜5において、フォーカスは
第1レンズ群1を光軸に沿って移動させて行っている。
又、可変間隔D8にスクリーン距離∞時の間隔を示す。
In the first to fifth embodiments, focusing is performed by moving the first lens unit 1 along the optical axis.
Further, the variable spacing D 8 shows the interval at the screen distance ∞.

【0018】尚、各数値条件式に対応した各数値実施例
の値を以下の表に示す。
The values of each numerical example corresponding to each numerical conditional expression are shown in the following table.

【0019】諸収差は広角端で倍率3/100倍の距離
のときのものである。
Various aberrations are at a wide angle end and a distance of 3/100 times.

【0020】[0020]

【外1】 [Outside 1]

【0021】[0021]

【外2】 [Outside 2]

【0022】[0022]

【外3】 [Outside 3]

【0023】[0023]

【外4】 [Outside 4]

【0024】[0024]

【外5】 [Outside 5]

【0025】[0025]

【表1】 [Table 1]

【0026】[0026]

【発明の効果】以上説明した本発明は、縮少側倍率3/
100を得る投影距離を3.5mまで短縮化することが
でき、また表示画面や色分解、色合成系の小型化に適合
したバックフォーカスを得ると同時に高性能を達成し、
更にレンズ外径を小さくするとともにコストダウンを図
ることができた。
According to the present invention described above, the reduction side magnification 3 /
The projection distance to obtain 100 can be shortened to 3.5 m, and the back focus suitable for miniaturization of the display screen, color separation, and color synthesis system is obtained, and at the same time, high performance is achieved.
Further, the outer diameter of the lens can be reduced and the cost can be reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図1】数値実施例1に対応するレンズ断面図。FIG. 1 is a lens cross-sectional view corresponding to Numerical Example 1.

【図2】数値実施例2に対応するレンズ断面図。FIG. 2 is a lens cross-sectional view corresponding to Numerical Example 2.

【図3】数値実施例3に対応するレンズ断面図。FIG. 3 is a lens cross-sectional view corresponding to Numerical Example 3.

【図4】数値実施例4に対応するレンズ断面図。FIG. 4 is a lens cross-sectional view corresponding to Numerical Example 4.

【図5】数値実施例5に対応するレンズ断面図。FIG. 5 is a lens sectional view corresponding to Numerical Example 5.

【図6】数値実施例1に関する諸収差図。FIG. 6 is a diagram illustrating various aberrations according to Numerical Example 1.

【図7】数値実施例2に関する諸収差図。FIG. 7 is a diagram showing various aberrations in Numerical Example 2.

【図8】数値実施例3に関する諸収差図。FIG. 8 is a diagram illustrating various aberrations according to Numerical Example 3.

【図9】数値実施例4に関する諸収差図。FIG. 9 is a diagram showing various aberrations in Numerical Example 4.

【図10】数値実施例5に関する諸収差図。FIG. 10 is a diagram illustrating various aberrations relating to Numerical Example 5.

【図11】液晶プロジェクター光学配置図。FIG. 11 is an optical arrangement diagram of a liquid crystal projector.

【符号の説明】[Explanation of symbols]

W 広角端 M 中間画角 T 望遠端 1 光源 2 液晶表示素子 3 ミラー 4 赤反射ダイクロイックミラー 5 緑反射ダイクロイックミラー 6 青反射ダイクロイックミラー 7 投影レンズ W Wide-angle end M Intermediate angle of view T Telephoto end 1 Light source 2 Liquid crystal display element 3 Mirror 4 Red reflection dichroic mirror 5 Green reflection dichroic mirror 6 Blue reflection dichroic mirror 7 Projection lens

フロントページの続き (56)参考文献 特開 昭64−25115(JP,A) 特開 昭56−14212(JP,A) 特開 昭54−15733(JP,A) 特開 平4−46310(JP,A) 特開 平4−56814(JP,A) 特開 平4−67112(JP,A) 特開 平4−67113(JP,A) 特公 昭44−30912(JP,B1) (58)調査した分野(Int.Cl.6,DB名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04 Continuation of front page (56) References JP-A-64-25115 (JP, A) JP-A-56-14212 (JP, A) JP-A-54-15733 (JP, A) JP-A-4-46310 (JP) JP-A-4-56814 (JP, A) JP-A-4-67112 (JP, A) JP-A-4-67113 (JP, A) JP-B-44-30912 (JP, B1) (58) Surveyed field (Int.Cl. 6 , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 大きな共役側から順に、負の屈折力を有
する第1レンズ群、正の屈折力を有する第2レンズ群
2つのレンズ群によって構成され、広角側から望遠側へ
の変倍に際して前記第2レンズ群を大きな共役側へ移動
させるズームレンズであって、広角端における前記第2
レンズ群の最終レンズから小さな共役までの距離をbf
w、広角端における全系の焦点距離をfw、前記第1レ
ンズ群と第2レンズ群の焦点距離をf1、f2、前記第1
レンズ群と第2レンズ群との主点間隔をew、前記第2
レンズ群中の空気間隔が最大となる部分を境に分割した
大きな共役側の前群の焦点距離をf 2a 、小さな共役側の
後群の焦点距離をf 2b 、その主点間隔をe 2 とすると
き、 1.25<bfw/fw< 1.6 …(1) −1.2 <f1/fw < −0.6 …(2) 0.5 <f2/fw < 0.9 …(3) 0.3 <ew/fw < 0.8 …(4)0.3 <f 2 /f 2a < 0.7 …(5) 0.5 <f 2 /f 2b < 0.8 …(6) 0.35<e 2 /f 2 < 0.7 …(7) なる条件を満足することを特徴とするズームレンズ。
1. A first lens unit having a negative refractive power and a second lens unit having a positive refractive power are arranged in order from the largest conjugate side .
A zoom lens configured by two lens groups and moving the second lens group to a large conjugate side during zooming from a wide-angle side to a telephoto side, wherein the second lens group at a wide-angle end is
The distance from the last lens of the lens group to the small conjugate is bf
w, the focal length of the entire system at the wide-angle end is fw, the focal lengths of the first lens unit and the second lens unit are f 1 and f 2 ,
The distance between the principal points between the lens group and the second lens group is ew ,
Divided at the point where the air gap in the lens group is the largest
Let f 2a be the focal length of the front group on the large conjugate side, and
Focal length f 2b of the rear group, when the distance between principal points and e 2
Come, 1.25 <bfw / fw <1.6 ... (1) -1.2 <f 1 / fw <-0.6 ... (2) 0.5 <f 2 / fw <0.9 ... (3 ) 0.3 <ew / fw <0.8 ... (4) 0.3 <f 2 / f 2a <0.7 ... (5) 0.5 <f 2 / f 2b <0.8 ... (6) 0.35 <e 2 / f 2 <0.7 (7) A zoom lens characterized by satisfying the following condition:
JP3194116A 1991-08-02 1991-08-02 Zoom lens Expired - Fee Related JP2984424B2 (en)

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JP3194116A JP2984424B2 (en) 1991-08-02 1991-08-02 Zoom lens

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Application Number Priority Date Filing Date Title
JP3194116A JP2984424B2 (en) 1991-08-02 1991-08-02 Zoom lens

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JPH0534596A JPH0534596A (en) 1993-02-12
JP2984424B2 true JP2984424B2 (en) 1999-11-29

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3394107B2 (en) * 1995-01-19 2003-04-07 三菱電機株式会社 Zoom lens and projection display device
JP4654506B2 (en) * 1999-12-02 2011-03-23 株式会社ニコン Zoom lens
JP4588416B2 (en) * 2004-11-04 2010-12-01 富士フイルム株式会社 Zoom lens with anti-vibration function
JP4928248B2 (en) * 2006-12-20 2012-05-09 キヤノン株式会社 Zoom lens and imaging apparatus having the same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5415733A (en) * 1977-06-10 1979-02-05 Asahi Optical Co Ltd Lowwmagnification variableeangleelens system
JPS5614212A (en) * 1979-07-13 1981-02-12 Minolta Camera Co Ltd Zoom lens system
JPS6425115A (en) * 1987-07-22 1989-01-27 Minolta Camera Kk Projection lens system
JP3033148B2 (en) * 1990-07-06 2000-04-17 ミノルタ株式会社 Compact zoom lens
JP3033138B2 (en) * 1990-06-13 2000-04-17 ミノルタ株式会社 Compact zoom lens
JP3033149B2 (en) * 1990-07-06 2000-04-17 ミノルタ株式会社 Compact zoom lens
JP3033141B2 (en) * 1990-06-22 2000-04-17 ミノルタ株式会社 Compact zoom lens

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