JPH0694996A - Wide angle zoom lens having stationary group having positive refracting power - Google Patents
Wide angle zoom lens having stationary group having positive refracting powerInfo
- Publication number
- JPH0694996A JPH0694996A JP1165391A JP1165391A JPH0694996A JP H0694996 A JPH0694996 A JP H0694996A JP 1165391 A JP1165391 A JP 1165391A JP 1165391 A JP1165391 A JP 1165391A JP H0694996 A JPH0694996 A JP H0694996A
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- lens
- power
- refracting power
- wide angle
- 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.)
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Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、小型の広角ズームレ
ンズ、特にテレセントリック性を有するズームレンズに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact wide-angle zoom lens, and more particularly to a telecentric zoom lens.
【0002】[0002]
【従来の技術】近年CCDやMOS等の固体撮像素子を
用いた電子スチルカメラやビデオカメラが普及してきて
いるが、これらのカメラの光学系には射出瞳位置が像面
から十分はなれることが要求される。これは撮像素子上
の色フィルターが撮像面からややはなれた位置にあるた
めに、光束が斜めから入射した場合、実質的な開口効率
が低下することや、撮像素子の周期構造に起因するモア
レ現象を防止するための水晶フィルターの実効厚が、軸
上と周辺であまり変動しないことが求められるためであ
る。また最近の高感度型小型撮像素子では、撮像面の直
前にマイクロレンズアレーを持つものがあり、この場合
にも、射出瞳が十分離れていないと開口効率が周辺で低
下する。2. Description of the Related Art In recent years, electronic still cameras and video cameras using solid-state image pickup devices such as CCD and MOS have become widespread. However, the exit pupil position of the optical system of these cameras can be sufficiently large from the image plane. Required. This is because the color filter on the image sensor is located slightly away from the image plane, so that when the light beam is obliquely incident, the aperture efficiency is substantially reduced, and the moire phenomenon is caused by the periodic structure of the image sensor. This is because it is required that the effective thickness of the crystal filter for preventing this does not fluctuate much on and around the axis. Further, some recent high-sensitivity small-sized image pickup devices have a microlens array immediately in front of the image pickup surface, and even in this case, if the exit pupils are not sufficiently separated, the aperture efficiency is lowered in the periphery.
【0003】従来から、物体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レンズ群か
ら構成され、これらの群の間隔を変化させることにより
変倍を行なうズームレンズで、比較的広角で2倍程度の
変倍比を持つものはいわゆる2群ズームとしてよく知ら
れている。これらの多くは、その開口絞りを第2レンズ
群の前後もしくは内部に置き、変倍中第2レンズ群と一
体で移動する。この様なズームレンズをCCDやMOS
等の固体撮像素子を用いたカメラに使用しようとすると
射出瞳位置が撮像面に近くなりすぎて好ましくない。Conventionally, the zoom lens system is composed of a first lens group having a negative refractive power and a second lens group having a positive refractive power in order from the object side, and zooming is performed by changing the interval between these groups. A lens having a relatively wide angle and a zoom ratio of about 2 is well known as a so-called two-group zoom. Many of these have their aperture stops placed in front of or behind the second lens group and move integrally with the second lens group during zooming. Such a zoom lens is used for CCD or MOS
When it is used in a camera using a solid-state image sensor such as the above, the position of the exit pupil is too close to the image pickup surface, which is not preferable.
【0004】そこで第2レンズ群の後方に正の屈折力を
有する固定群を置くことで射出瞳位置を遠ざけることが
考えられる。この様な正の固定の第3群を追加した構成
のズームレンズとしては特開昭60−120311号公
報、特開昭60−181717号公報、特開昭62−8
7925号公報、特開平2−118509号公報などに
記載されたズームレンズが知られている。しかし、これ
らはいづれも主として一眼レフスチールカメラ用に設計
されたもので、レンズマウントの径の制約やコンパクト
化との兼ね合いから、第3群の正の屈折力はきわめて弱
く、射出瞳を十分遠ざけるには至らず、特に変倍に伴っ
て絞り位置が第2レンズ群と共に像面に近づく広角側で
この傾向が著しくなり、上記目的には用いることができ
なかった。Therefore, it is conceivable to place the fixed lens unit having a positive refractive power behind the second lens unit to move the exit pupil position away. As a zoom lens having a configuration in which such a positive fixed third lens group is added, there are disclosed in JP-A-60-120311, JP-A-60-181717, and JP-A-62-8.
Zoom lenses described in Japanese Patent No. 7925, Japanese Patent Laid-Open No. 2-118509, etc. are known. However, these are all designed mainly for single-lens reflex steel cameras, and due to the restrictions on the diameter of the lens mount and the compactness, the positive refractive power of the third group is extremely weak, and the exit pupil is sufficiently far away. This tendency becomes remarkable especially on the wide-angle side where the diaphragm position approaches the image plane together with the second lens group due to zooming, and it cannot be used for the above purpose.
【0005】[0005]
【発明が解決しようとする課題】この発明はこの様な状
況に鑑み、変倍比2倍程度の広角ズームレンズで、明る
く、コンパクトで、射出瞳位置が撮像面から十分にはな
れた、電子スチルカメラやビデオカメラ用に好適なズー
ムレンズを提供しようとするものである。In view of such a situation, the present invention provides a wide-angle zoom lens having a variable power ratio of about 2 times, which is bright, compact, and has an exit pupil position sufficiently displaced from the imaging surface. It is intended to provide a zoom lens suitable for a camera or a video camera.
【0006】[0006]
【課題を解決するための手段】上記の課題を解決するた
め、この発明のズームレンズの基本的な構成は、物体側
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、正の屈折力を有する第3レン
ズ群の3つのレンズ群から構成され、第2レンズ群が光
軸上を前後に移動して変倍を行い、第1レンズ群は第2
レンズ群に関連して移動して変倍にともなう焦点位置の
移動を補正し、第3レンズ群は変倍中固定され、以下の
条件を満足することを特徴とする。 4<f3/fw<10 (1) 但し、f3は第3レンズ群の焦点距離、fwは全系の広
角端の焦点距離を示す。In order to solve the above-mentioned problems, the basic construction of the zoom lens of the present invention comprises, in order from the object side, a first lens group having a negative refractive power and a positive refractive power. The second lens group has a second lens group and a third lens group having a positive refractive power, and the second lens group moves back and forth on the optical axis to perform zooming. Two
It is characterized in that it moves in relation to the lens group to correct the movement of the focal position due to zooming, and the third lens group is fixed during zooming and satisfies the following conditions. 4 <f 3 / fw <10 (1) where f 3 is the focal length of the third lens group, and fw is the focal length at the wide-angle end of the entire system.
【0007】また、開口絞りを第1レンズ群と第2レン
ズ群の間に変倍中固定して配設したことを特徴とする。An aperture stop is fixed between the first lens group and the second lens group during zooming.
【0008】この発明のズームレンズは、更に具体的に
は、第2レンズ群は物体側から順に少なくとも2枚の正
レンズ、像側に強い凹面を向けた1枚の負レンズ、1枚
の正レンズから構成され、上記物体側にある少なくとも
2枚の正レンズ中、1枚は正レンズと負レンズからなる
貼り合わせダブレットでも良く、以下の条件を満たす。 0.65<|m(2T)|<0.8 ( m(2T) <0) (2) 1.65<np (3) 但し、m(2T)は第2群の望遠端での結像倍率、np は第
2レンズ群中、最も物体側にある2枚の正レンズの屈折
率の平均値である。正レンズが貼り合わせダブレットか
ら構成されるばあい、np はこれを構成する正レンズの
屈折率とする。More specifically, in the zoom lens according to the present invention, the second lens group includes, in order from the object side, at least two positive lenses, one negative lens with a strong concave surface facing the image side, and one positive lens. Of the at least two positive lenses that are composed of lenses and are on the object side, one may be a cemented doublet consisting of a positive lens and a negative lens, and the following conditions are satisfied. 0.65 <| m (2T) | <0.8 (m (2T) <0) (2) 1.65 <np (3) However, m (2T) is an image at the telephoto end of the second lens group. The magnification, np, is the average value of the refractive indices of the two positive lenses closest to the object in the second lens group. When the positive lens is composed of a cemented doublet, np is the refractive index of the positive lens that constitutes it.
【0009】更に、第1レンズ群は物体側から順に、物
体側に凸面を向けた負の屈折力のメニスカスレンズ、負
レンズ、物体側に凸面を向けた正の屈折力のメニスカス
レンズから構成される。Further, the first lens group is composed of, in order from the object side, a meniscus lens having a negative refractive power with a convex surface facing the object side, a negative lens, and a meniscus lens having a positive refractive power having a convex surface facing the object side. It
【0010】[0010]
【作用】この発明のズームレンズにおいては、変倍中固
定の第3群の正の屈折力を従来に比べて強い屈折力とし
た上、絞り位置を第1レンズ群と第2レンズ群の間に固
定することにより射出瞳位置を撮像面から遠ざけてお
り、特に広角端で著しい効果を有する。また第2群の物
体側に強い正の屈折力を集中させることによってバック
フォーカスを短くし、全長のコンパクト化を計った。ま
た、従来に比べて明るい口径比を実現するため、軸上光
束の最も高くなる第2レンズ群の正レンズに高屈折率硝
材を用いている。In the zoom lens of the present invention, the positive refractive power of the third lens unit fixed during zooming is made stronger than that of the conventional one, and the diaphragm position is between the first lens unit and the second lens unit. The position of the exit pupil is kept away from the image pickup surface by fixing it at, and it has a remarkable effect especially at the wide-angle end. In addition, the back focus was shortened by concentrating a strong positive refracting power on the object side of the second lens group, and the overall length was made compact. Further, in order to realize a bright aperture ratio as compared with the conventional one, a high refractive index glass material is used for the positive lens of the second lens group in which the axial light flux is highest.
【0011】条件(1)は第3レンズ群の屈折力に関
し、上限をこえると射出瞳位置を十分遠方にとることが
できなくなり、下限をこえると射出瞳の位置には有利で
あるが、全系の屈折力配置がアンバランスになり、広角
端で負の歪曲収差の発生が著しくなる。The condition (1) relates to the refracting power of the third lens group. If the upper limit is exceeded, the exit pupil position cannot be set sufficiently far, and if the lower limit is exceeded, it is advantageous for the exit pupil position. The refracting power arrangement of the system becomes unbalanced, and negative distortion occurs significantly at the wide-angle end.
【0012】条件(2)はバックフォーカスに関する。
この条件の上限を越えると望遠端でバックフォーカスが
長くなりすぎ、コンパクト性の点に不満が生じる。下限
を越えると望遠端では全長が短くなるが、これに伴い、
望遠端で所定の全系焦点距離を確保するため第1レンズ
群の屈折力が弱くなり、第1レンズ群の移動量が増大し
てしまう。The condition (2) relates to the back focus.
If the upper limit of this condition is exceeded, the back focus becomes too long at the telephoto end, and the compactness becomes unsatisfactory. If the lower limit is exceeded, the total length will become shorter at the telephoto end, but with this,
Since the predetermined focal length of the entire system is secured at the telephoto end, the refracting power of the first lens group becomes weak and the movement amount of the first lens group increases.
【0013】条件(3)は第2レンズ群中物体側にある
2枚の正レンズの屈折率に関し、この条件を外れると、
比較的Fナンバーの明るい広角端で球面収差が補正不足
となる。The condition (3) relates to the refractive indices of the two positive lenses on the object side in the second lens unit. If this condition is not satisfied,
Spherical aberration is undercorrected at the wide-angle end where the F number is relatively bright.
【0014】絞り位置を変倍中固定したことによって、
絞り羽根の格納部を有しレンズ径に比べ大きな部材であ
る絞り装置を変倍中移動することがなくなり、鏡枠構造
上も大きな利点となる。By fixing the aperture position during zooming,
The diaphragm device, which is a member having a housing portion for the diaphragm blade and larger than the lens diameter, does not move during zooming, which is a great advantage in terms of the lens frame structure.
【0015】[0015]
【実施例】以下この発明のズームレンズの実施例を示
す。絞り位置は何れの実施例でも、望遠端で、第2レン
ズ群の直前1.0のところにある。また射出瞳位置の表
示は、像面を基準とし、物体側へ計る時マイナスの符号
をとる。尚、表中の各記号は、Rは各レンズ面の曲率半
径、Dはレンズの中心厚またはレンズ間隔、Nは硝材の
屈折率、νd はアッベ数、fはレンズ全系の焦点距離、
2ωは画角、FはFナンバー、fB はバックフォーカ
ス、Yは最大像高、A、Bは第2レンズ群の移動量を示
す。EXAMPLES Examples of the zoom lens of the present invention will be shown below. In any of the embodiments, the diaphragm position is at the telephoto end and 1.0 immediately before the second lens group. The display of the exit pupil position is based on the image plane and has a minus sign when measured toward the object side. In the table, R is the radius of curvature of each lens surface, D is the lens center thickness or lens spacing, N is the refractive index of the glass material, νd is the Abbe number, f is the focal length of the entire lens system,
2ω is the angle of view, F is the F number, fB is the back focus, Y is the maximum image height, and A and B are the movement amounts of the second lens group.
【0016】実施例1 f=12.50〜24.25 F:2.70〜3.60 2ω=54.9〜30.0 Y=6.50 No. R D N νd 1 19.550 1.00 1.83400 37.2 2 10.913 4.50 3 第1レンズ群 120.915 1.00 1.79952 42.2 4 21.792 0.20 5 14.592 2.50 1.80518 25.4 6 33.681 A 7 26.029 2.00 1.77250 49.6 8 -48.290 0.20 9 第2レンズ群 8.511 3.00 1.77250 49.6 10 20.792 0.50 11 76.839 1.50 1.80518 25.4 12 6.623 2.50 13 1012.457 2.00 1.71300 53.9 14 -22.557 B 15 第3レンズ群 -33.220 2.00 1.71300 53.9 16 -20.008 3.88 17 カバーガラス ∞ 5.00 1.51633 64.1 18 ∞ 可変間隔及び射出瞳位置 f A B 射出瞳位置 12.50 23.98 2.30 −50 16.94 13.14 5.17 −43 24.25 4.00 9.99 −42 各レンズ群の焦点距離 f1 =−32.895 f2 = 18.310 f3 = 66.375 f3/fw=5.31 m(2T)=0.739 np =1.7725Example 1 f = 12.50 to 24.25 F: 2.70 to 3.60 2ω = 54.9 to 30.0 Y = 6.50 No. RD N νd 1 19.550 1.00 1.83400 37.2 2 10.913 4.50 3 1st lens group 120.915 1.00 1.79952 42.2 4 21.792 0.20 5 14.592 2.50 1.80518 25.4 6 33.681 A 7 26.029 2.00 1.77250 49.6 8 -48.290 0.20 9 2nd lens group 8.511 3.00 1.77250 49.6 10 10 20.792 0.50 11 76.839 1.50 6.805 1.805 2.50 13 1012.457 2.00 1.71300 53.9 14 -22.557 B 15 3rd lens group -33.220 2.00 1.71300 53.9 16 -20.008 3.88 17 Cover glass ∞ 5.00 1.51633 64.1 18 ∞ Variable spacing and exit pupil position f A B Exit pupil position 12.50 23. 98 2.30 -50 16.94 13.14 5.17 -43 24.25 4.00 9.99 -42 focal length f 1 = -32.895 f 2 = 18.310 f 3 of the lens groups = 66.375 f 3 /fw=5.31 m (2T ) = 0.739 np = 1.7725
【0017】実施例2 f=10.80〜20.15 F:2.80〜4.00 2ω=62.1〜35.2 Y=6.50 No. R D N νd 1 21.884 0.90 1.83400 37.2 2 12.019 3.50 3 第1レンズ群 52.330 0.90 1.83400 37.2 4 17.495 1.40 5 15.112 2.50 1.84666 23.8 6 30.960 A 7 71.753 2.00 1.71300 53.9 8 -81.294 0.20 9 第2レンズ群 17.028 2.00 1.71300 53.9 10 -334.973 0.20 11 8.126 2.00 1.71300 53.9 12 13.518 0.70 13 36.586 2.00 1.84666 23.8 14 6.376 1.48 15 -85.465 2.00 1.71300 53.9 16 -16.883 B 17 第3レンズ群 -30.139 2.00 1.71300 53.9 18 -17.702 3.97 19 カバーガラス ∞ 6.00 1.51633 64.1 20 ∞ 可変間隔及び射出瞳位置 f A B 射出瞳位置 10.80 23.21 1.00 −39 15.01 11.30 3.73 −36 20.51 3.00 7.00 −35 各レンズ群の焦点距離 f1 =−32.505 f2 = 16.727 f3 = 56.394 f3/fw=5.222 m(2T)=0.741 np =1.713Example 2 f = 10.80 to 20.15 F: 2.80 to 4.00 2ω = 62.1 to 35.2 Y = 6.50 No. RD N νd 1 21.884 0.90 1.83400 37.2 2 12.019 3.50 3 1st lens group 52.330 0.90 1.83400 37.2 4 17.495 1.40 5 15.112 2.50 1.84666 23.8 6 30.960 A 7 71.753 2.00 1.71300 53.9 8 -81.294 0.20 9 2nd lens group 17.028 2.00 1.71300 53.9 300 10 -334.973 0.20 ll 5126 2.00 1.71 13.518 0.70 13 36.586 2.00 1.84666 23.8 14 6.376 1.48 15 -85.465 2.00 1.71300 53.9 16 -16.883 B 17 3rd lens group -30.139 2.00 1.71300 53.9 18 -17.702 3.97 19 Cover glass ∞ 6.00 1.51633 64.1 20 ∞ Variable distance and exit pupil position f a B exit pupil position 10.80 23.21 1.00 -39 15.01 11.30 3.73 -36 20.51 3.00 7.00 -35 focal length f 1 of the lens groups = - 2.505 f 2 = 16.727 f 3 = 56.394 f 3 /fw=5.222 m (2T) = 0.741 np = 1.713
【0018】実施例3 f=10.80〜20.52 F:2.80〜4.00 2ω=62.1〜35.2 Y=6.50 No. R D N νd 1 20.142 0.90 1.83400 37.2 2 11.717 3.50 3 第1レンズ群 70.102 0.90 1.83400 37.2 4 15.569 1.40 5 15.165 2.50 1.84666 23.8 6 41.475 A 7 12.544 3.00 1.78590 44.2 8 -17.065 1.20 1.84666 23.8 9 第2レンズ群 -40.823 0.20 10 9.622 2.00 1.83400 37.2 11 19.449 0.60 12 -34.854 2.00 1.84666 23.8 13 6.862 1.20 14 -190.125 2.00 1.59270 35.3 15 -11.861 B 16 第3レンズ群 -33.313 2.00 1.64769 33.8 17 -22.304 3.07 18 カバーガラス ∞ 6.00 1.51633 64.1 19 ∞ 可変間隔及び射出瞳位置 f A B 射出瞳位置 10.80 23.19 1.00 −30 15.01 11.27 3.39 −29 20.52 3.00 6.31 −29 各レンズ群の焦点距離 f1 =−31.489 f2 = 15.736 f3 = 97.261 f3/fw=9.01 m(2T)=0.700 np =1.80995Example 3 f = 10.80 to 20.52 F: 2.80 to 4.00 2 ω = 62.1 to 35.2 Y = 6.50 No. RD N νd 1 20.142 0.90 1.83400 37.2 2 11.717 3.50 3 1st lens group 70.102 0.90 1.83400 37.2 4 15.569 1.40 5 15.165 2.50 1.84666 23.8 6 41.475 A 7 12.544 3.00 1.78590 44.2 8 -17.065 1.20 1.84666 23.8 9 2nd lens group -40.823 0.20 910 9.622 2.00 1.83400 37.2 12 19.449 0.60 -34.854 2.00 1.84666 23.8 13 13 6.862 1.20 14 -190.125 2.00 1.59270 35.3 15 15 -11.861 B 16 3rd lens group -33.313 2.00 1.64769 33.8 17 -22.304 3.07 18 Cover glass ∞ 6.00 1.51633 64.1 19 ∞ Variable spacing and exit pupil position f A B exit pupil position 10.80 23.19 1.00 -30 15.01 11.27 3.39 -29 20.52 3.00 6.31 -29 focal length f of the lens group 1 = -31.489 2 = 15.736 f 3 = 97.261 f 3 /fw=9.01 m (2T) = 0.700 np = 1.80995
【0019】[0019]
【発明の効果】上記の各実施例及び収差図で明らかな様
に、この発明のズームレンズは、2倍程度の変倍比を有
する比較的広角で明るく、コンパクトで、しかも射出瞳
位置を十分遠方になる様に構成することが出来、その収
差も良好に補正されたものが実現できた。As is apparent from the above-mentioned embodiments and aberration diagrams, the zoom lens of the present invention is relatively wide-angle, bright and compact with a zoom ratio of approximately 2 and has a sufficient exit pupil position. It was possible to configure the lens so that it was at a distance, and the aberration was well corrected.
【図1】この発明のズームレンズの第1実施例のミドル
ポジションでの断面図FIG. 1 is a sectional view of a zoom lens according to a first embodiment of the present invention at a middle position.
【図2】この発明のズームレンズの第2実施例のミドル
ポジションでの断面図FIG. 2 is a sectional view of a zoom lens according to a second embodiment of the present invention in a middle position.
【図3】この発明のズームレンズの第3実施例のミドル
ポジションでの断面図FIG. 3 is a sectional view of a zoom lens according to a third embodiment of the present invention in a middle position.
【図4】この発明のズームレンズの第1実施例の収差曲
線図FIG. 4 is an aberration curve diagram of the first embodiment of the zoom lens according to the present invention.
【図5】この発明のズームレンズの第2実施例の収差曲
線図FIG. 5 is an aberration curve diagram of a second embodiment of the zoom lens according to the present invention.
【図6】この発明のズームレンズの第3実施例の収差曲
線図FIG. 6 is an aberration curve diagram of a third embodiment of the zoom lens according to the present invention.
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【手続補正書】[Procedure amendment]
【提出日】平成5年10月5日[Submission date] October 5, 1993
【手続補正2】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】全図[Correction target item name] All drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図1】 [Figure 1]
【図2】 [Fig. 2]
【図3】 [Figure 3]
【図4】 [Figure 4]
【図5】 [Figure 5]
【図6】 [Figure 6]
Claims (2)
1レンズ群、正の屈折力を有する第2レンズ群、正の屈
折力を有する第3レンズ群の3つのレンズ群から構成さ
れ、第2レンズ群が光軸上を前後に移動して変倍を行
い、第1レンズ群は第2レンズ群に関連して移動し変倍
にともなう焦点位置の移動を補正し、第3レンズ群は変
倍中固定され、以下の条件を満足することを特徴とする
広角ズームレンズ。 4<f3/fw<10 但し、f3は第3レンズ群の焦点距離、fwは全系の広
角端の焦点距離を示す。1. A three-lens group having, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power. , The second lens group moves back and forth on the optical axis to perform zooming, and the first lens group moves in relation to the second lens group to correct the movement of the focal position due to zooming, and the third lens group A wide-angle zoom lens characterized in that the group is fixed during zooming and satisfies the following conditions. 4 <f 3 / fw <10 where f 3 is the focal length of the third lens group, and fw is the focal length at the wide-angle end of the entire system.
の間に変倍中固定して配設したことを特徴とする請求項
1のズームレンズ2. The zoom lens according to claim 1, wherein an aperture stop is fixedly disposed between the first lens group and the second lens group during zooming.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1165391A JPH0694996A (en) | 1991-01-09 | 1991-01-09 | Wide angle zoom lens having stationary group having positive refracting power |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1165391A JPH0694996A (en) | 1991-01-09 | 1991-01-09 | Wide angle zoom lens having stationary group having positive refracting power |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0694996A true JPH0694996A (en) | 1994-04-08 |
Family
ID=11783925
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1165391A Pending JPH0694996A (en) | 1991-01-09 | 1991-01-09 | Wide angle zoom lens having stationary group having positive refracting power |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0694996A (en) |
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1991
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