JP3219574B2 - Zoom lens - Google Patents
Zoom lensInfo
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- JP3219574B2 JP3219574B2 JP28510393A JP28510393A JP3219574B2 JP 3219574 B2 JP3219574 B2 JP 3219574B2 JP 28510393 A JP28510393 A JP 28510393A JP 28510393 A JP28510393 A JP 28510393A JP 3219574 B2 JP3219574 B2 JP 3219574B2
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- lens
- lens group
- group
- refractive power
- object side
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Description
【０００１】[0001]
【産業上の利用分野】本発明は変倍レンズに関し、特に
ビデオカメラや写真用カメラ等に好適で、比較的レンズ
枚数が少ないながらも全変倍範囲にわたり良好な光学性
能を有し変倍比が２倍程度の変倍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 variable power lens, and is particularly suitable for a video camera, a photographic camera, etc., and has good optical performance over the entire variable power range while having a relatively small number of lenses. Is related to a variable power lens of about 2 times.
【０００２】[0002]
【従来の技術】従来よりビデオカメラや写真用カメラ等
に好適な広角域を含む変倍レンズとして負の屈折力の第
１レンズ群、正の屈折力の第２レンズ群、負の屈折力の
第３レンズ群、正の屈折力の第４レンズ群より成り、各
々のレンズ群の空気間隔を変化させて変倍を行った変倍
レンズはすでに知られており、例えば特開昭５８−４１
１３号公報、特開平５−１９１７０号公報等で提案され
ており、こうしたズームレンズでは３〜４倍程度のズー
ム比を持っている。2. Description of the Related Art Conventionally, as a variable power lens including a wide angle range suitable for a video camera, a photographic camera or the like, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a negative lens having a negative refractive power. A variable power lens composed of a third lens group and a fourth lens group having a positive refractive power and performing zooming by changing the air spacing of each lens group is already known.
No. 13, JP-A-5-19170, etc., such a zoom lens has a zoom ratio of about 3 to 4 times.
【０００３】一般に負屈折力を有するレンズ群が先行す
る変倍レンズは、前玉径を比較的小さくすることが可能
であることから主に広角域を含む変倍範囲を有する変倍
レンズに好適であり、また、前述の４群構成の変倍レン
ズにおいては、比較的多群であるために、高変倍を可能
としている。In general, a variable power lens which is preceded by a lens group having a negative refractive power is suitable for a variable power lens having a variable power range mainly including a wide angle range since the front lens diameter can be made relatively small. In addition, in the above-described zoom lens having a four-group configuration, a relatively large number of groups enables a high zoom ratio.
【０００４】又、特開平１−２１６３１０号公報におい
てはビデオカメラ用変倍レンズとして変倍比２〜３程度
で全系におけるレンズ枚数が４〜５枚の低コスト化、小
型軽量化を図った変倍レンズが提案されている。Japanese Patent Application Laid-Open No. 1-216310 discloses a low-cost, small-size and light-weight variable-magnification lens for a video camera having a magnification ratio of about 2 to 3 and 4 to 5 lenses in the entire system. Magnifying lenses have been proposed.
【０００５】[0005]
【発明が解決しようとしている課題】近年ビデオカメラ
や写真用カメラ等の軽量小型化が図られる一方変倍レン
ズにも低コスト化、軽量化が要望されている。しかしな
がら前記特開昭５８−４１１３号公報、特開平５−１９
１７０号公報等で提案されている変倍レンズは、変倍比
が比較的大きなもののレンズ枚数も多く大型化してい
た。又、低コスト化、軽量化を図っている前記特開平１
−２１６３１０号公報においては、変倍比２〜３程度で
レンズ枚数を削減しているが、イメージサイズに対して
全系の光学全長が大きいという問題があった。In recent years, the weight and size of video cameras and photographic cameras have been reduced, while the cost and weight of variable power lenses have also been demanded. However, JP-A-58-4113 and JP-A-5-19
The zoom lens proposed in Japanese Patent Publication No. 170 and the like has a relatively large zoom ratio, but has a large number of lenses and has been enlarged. Also, Japanese Patent Application Laid-Open No. HEI 1 (1998), which has reduced cost and weight.
In JP-A-216310, the number of lenses is reduced at a zoom ratio of about 2 to 3, but there is a problem that the total optical length of the entire system is larger than the image size.
【０００６】本発明は、所定の屈折力より成る４群の変
倍レンズにおいて各レンズ群の屈折力及びレンズ構成を
適切に設定することにより、全変倍範囲にわたり良好な
光学性能を有した変倍比２程度のレンズ枚数が少ないビ
デオカメラや写真用カメラ等に好適な低コスト、小型の
変倍レンズの提供を目的としている。The present invention provides a variable power lens having good optical performance over the entire variable power range by appropriately setting the refractive power and lens configuration of each lens group in four variable power lenses having a predetermined refractive power. It is an object of the present invention to provide a low-cost, small-size variable power lens suitable for a video camera, a photographic camera, or the like having a small number of lenses with a magnification of about 2.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、物体側より順に、負の屈折力を有し変倍
中固定の第１レンズ群、正の屈折力を有する第２レンズ
群、負の屈折力を有する第３レンズ群、正の屈折力を有
する第４レンズ群を有し、広角端から望遠端にかけて前
記第２レンズ群、第３レンズ群、第４レンズ群をそれぞ
れ物体側方向へ光軸上移動させて変倍を行う変倍レンズ
であって、前記第１レンズ群、第２レンズ群、第３レン
ズ群、望遠端における全系の焦点距離を各々ｆ I ，
ｆII，ｆIII ，ｆ T とするとき、 ｜ｆII／ｆIII｜＜１ ・・・（１）０．３＜（ｆ Ｉ ／ｆ T ） 2 ＜０．５ ・・・（２）０．０５＜（ｆ II ／ｆ T ） 2 ＜０．２ ・・・（３） なる条件を満足することを特徴とすることを特徴として
いる。Means for Solving the Problems To achieve the above object,
Therefore, the present invention, in order from the object side, has a negative refractive power and
Middle fixed first lens group, second lens having positive refractive power
Group, third lens group with negative refractive power, with positive refractive power
A fourth lens group that moves from the wide-angle end to the telephoto end.
Each of the second lens group, the third lens group, and the fourth lens group
Variable magnification lens that moves on the optical axis toward the object side
And saidThe first lens group,Second lens group, third lens
Group, The whole system at the telephoto endThe focal length of eachf I ,
fII, FIII , F T | FII/ FIII| <1 (1)0.3 <(f I / F T ) Two <0.5 ... (2)0.05 <(f II / F T ) Two <0.2 ... (3) characterized by satisfying the following condition:
I have.
【０００８】[0008]
【０００９】[0009]
【実施例】以下図面を参照しながら本願発明に関する変
倍レンズを説明する。図１において、Ｉは負の屈折力を
有する第１レンズ群、ＩＩは正の屈折力を有する第２レ
ンズ群、ＩＩＩは負の屈折力を有する第３レンズ群、Ｉ
Ｖは正の屈折力を有する第４レンズ群である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a zoom lens according to the present invention. In FIG. 1, I is a first lens group having a negative refractive power, II is a second lens group having a positive refractive power, III is a third lens group having a negative refractive power, I
V is a fourth lens group having a positive refractive power.
【００１０】本実施例において、第１レンズ群を静止さ
せた状態で第２レンズ群、第３レンズ群、第４レンズ群
を物体側へ光軸上移動させることにより広角端から望遠
端への変倍を行う。そして本実施例では全体として５枚
構成とレンズ枚数の少ない、又、前述の条件を満足させ
て小型ズームレンズを達成している。In this embodiment, the second lens group, the third lens group, and the fourth lens group are moved on the optical axis toward the object side while the first lens group is stationary, so that the wide-angle end to the telephoto end can be obtained. Perform zooming. In this embodiment, a compact zoom lens is achieved with a five-lens configuration and a small number of lenses as a whole, and satisfying the above conditions.
【００１１】特に条件式（１）は、第２レンズ群と第３
レンズ群の焦点距離に関し、第２レンズ群と第３レンズ
群の屈折力を適切に保ち、レンズ枚数が少ないにもかか
わらず、変倍による収差変動が小さい小型の変倍レンズ
を可能とするためのものである。In particular, conditional expression (1) satisfies the second lens group and the third lens group.
Regarding the focal length of the lens groups, the second lens group and the third lens group maintain appropriate refractive powers, and enable a small zoom lens with small aberration fluctuation due to zooming despite the small number of lenses. belongs to.
【００１２】条件式（１）の上限値を越えて第２レンズ
群の焦点距離が第３レンズ群の焦点距離より大きくなり
第２レンズ群の屈折力が弱まると変倍における各群の移
動量が増大し、全長が大型化する傾向があるため好まし
くない。更に第２レンズ群の屈折力を強めすぎず、全変
倍範囲にわたり高い光学性能を得るため、望ましくは、
条件式（１）の下限値を０．８とすることである。ま
た、特に第１レンズ群をフォーカシング群にした場合、
フォーカシングの際の移動量を適切にし、又、収差変動
を少なくする必要があるため、条件式（２）により第１
レンズ群の焦点距離と望遠端における全系の焦点距離と
の比を規定している。 条件式（２）の下限値を越えて第
１レンズ群の屈折力が強めすぎると、フォーカシングの
際の移動量は小さくなり、第１レンズ群の小型化を図れ
るが、変倍時の収差変動が大きくなり他の群で補正する
ことが困難となり、又、上限値を越えて屈折力を弱めす
ぎるとフォーカシングの際の移動量が増大すると共に第
１レンズ群が大型化するので好ましくない。更に望まし
くは、条件式（２）の下限値を０．４、上限値を０．４
７とすることが望ましい。 また、条件式（３）は、第２
レンズ群の焦点距離と望遠端における全系の焦点距離の
比に関し、第２レンズ群の屈折力を適切に設定すること
により、所定の変倍比を得つつ変倍時の収差変動を抑え
るためのものである。 条件式（３）の下限値を越えて第
２レンズ群の屈折力が強まると、変倍時の移動量が少な
くなるものの変倍によって主に球面収差、コマ収差の変
動が大きく特に望遠端において収差の発生量が増大し、
収差補正が困難となり、又、上限値を越えて第２レンズ
群の屈折力を弱まると変倍時の移動量が増大し、レンズ
全長が大きくなるので好ましくない。 When the focal length of the second lens group exceeds the upper limit of conditional expression (1) and becomes larger than the focal length of the third lens group, and the refractive power of the second lens group is weakened, the amount of movement of each group during zooming And the overall length tends to increase, which is not preferable. Further, in order to obtain high optical performance over the entire zoom range without excessively increasing the refractive power of the second lens group,
The lower limit of conditional expression (1) is set to 0.8. Ma
Especially, when the first lens group is a focusing group,
Adjust the amount of movement during focusing, and change the aberration.
Since it is necessary to reduce the value of
The focal length of the lens group and the focal length of the entire system at the telephoto end
Stipulates the ratio of Beyond the lower limit of conditional expression (2)
If the refractive power of one lens group is too strong, focusing
Movement amount is small, and the first lens group can be downsized.
However, the aberration fluctuation at the time of zooming becomes large, and it is corrected by other groups.
Difficulties and weaken the refractive power beyond the upper limit
If it breaks, the amount of movement during focusing increases and
This is not preferable because one lens group becomes large. More desirable
In other words, the lower limit and the upper limit of conditional expression (2) are set to 0.4 and 0.4, respectively.
7 is desirable. Also, conditional expression (3) is
The focal length of the lens group and the focal length of the entire system at the telephoto end
Properly set the refractive power of the second lens group with respect to the ratio
Reduces aberration fluctuations during zooming while achieving a given zoom ratio
It is for. Beyond the lower limit of conditional expression (3)
When the refractive power of the two lens units increases, the amount of movement during zooming is small.
The change in magnification mainly changes spherical aberration and coma.
The movement is large and the amount of aberration increases, especially at the telephoto end,
Aberration correction becomes difficult, and the second lens exceeds the upper limit.
If the refractive power of the group is reduced, the amount of movement during zooming increases, and the lens
It is not preferable because the total length becomes large.
【００１３】本発明が目的とする低コスト、小型軽量な
変倍レンズは以上のような各要件を満足することにより
実現されるが、更に諸収差を良好に補正し、全変倍範囲
にわたり高い光学性能を有した変倍レンズを実現させる
ためには次の諸条件を満足させることが望ましい。The low-cost, compact, and lightweight zoom lens aimed at by the present invention is realized by satisfying the above requirements, but further corrects various aberrations well and has a high zoom ratio over the entire zoom range. In order to realize a variable power lens having optical performance, it is desirable to satisfy the following conditions.
【００１４】それは、第１群における負レンズと正レン
ズとの間の空気間隔をＤ、広角端における全系の光学全
長をｌとしたとき、 ０．０３＜Ｄ／ｌ＜０．１２ ・・・（４） なる条件を満足することである。[0014] It is, when the air gap between the negative lens and the positive lens in the first group were D, and the overall optical length of the entire system at the wide angle end l, 0.03 <D / l < 0.12 ··・ (4) The following condition must be satisfied.
【００１５】[0015]
【００１６】[0016]
【００１７】[0017]
【００１８】[0018]
【００１９】条件式（４）は、第１レンズ群中の負レン
ズと正レンズとの間の空気間隔とレンズ全長との比に関
し、主に変倍による球面収差とコマ収差の変動を抑える
ためのものであり、下限値を越えて空気間隔が狭くなる
と第１レンズ群の正レンズの屈折力が強くなり、第１レ
ンズ群で発生する球面収差及びコマ収差の変動が増大
し、上限値を越えて空気間隔が広げ過ぎると第１レンズ
群の厚みが増大し、レンズ全長が増大するので良くな
い。更に、諸収差の補正とレンズ全長を適切に設定する
には条件式（４）の下限値を０．０５、上限値を０．１
にすることが望ましい。Conditional expression (4) relates to the ratio of the air gap between the negative lens and the positive lens in the first lens unit to the total length of the lens, and is intended mainly to suppress fluctuations in spherical aberration and coma due to zooming. When the air gap becomes narrower than the lower limit, the refractive power of the positive lens of the first lens group becomes stronger, the fluctuation of spherical aberration and coma occurring in the first lens group increases, and the upper limit is reduced. If the air gap is too large, the thickness of the first lens unit increases, and the total lens length increases, which is not good. Further, in order to correct various aberrations and appropriately set the total lens length, the lower limit of conditional expression (4) is set to 0.05 and the upper limit is set to 0.1.
Is desirable.
【００２０】具体的に、５枚程度レンズ枚数で構成する
には第１レンズ群を物体側に凸面を向けた負メニスカス
レンズ、同じく物体側に凸面を向けた正メニスカスレン
ズから構成し、第２レンズ群を物体に凸面を向けた正レ
ンズ、第３レンズ群を物体側に凸を向けた負メニスカス
レンズ、第４レンズ群を両凸レンズの単レンズで構成す
ることである。More specifically, in order to form a lens having about five lenses, the first lens group is composed of a negative meniscus lens having a convex surface facing the object side, and a positive meniscus lens having a convex surface facing the object side. The lens group is composed of a positive lens having a convex surface facing the object, the third lens group is composed of a negative meniscus lens having a convex surface facing the object side, and the fourth lens group is composed of a single lens of a biconvex lens.
【００２１】さらに本発明においては、高い光学性能を
得るために非球面を効果的に用いている。例えば、第１
レンズ群を負メニスカスレンズ、正メニスカスレンズの
２枚で構成したときの正メニスカスレンズに周辺部に行
くに従って曲率が大となる非球面を用いることで、全変
倍範囲において球面収差と非点収差をバランス良く補正
でき、また、広角端におけるコマ収差を補正できるので
良い。また、第２レンズ群の正レンズに周辺にいくに従
って曲率が大となる非球面を用いることで主に球面収差
を有効に補正できるので良い。又、本実施例のように第
２〜４群を各々レンズ１枚で構成した時、第２群〜第４
群の中からフォーカシング群として単独群を選定するこ
とは収差補正上困難であるため、多群でフォーカシング
を行うか、第１群をレンズ２枚以上で構成し、第１群で
フォーカシングを行うのが望ましい。Further, in the present invention, an aspherical surface is effectively used to obtain high optical performance. For example, the first
When the lens group is composed of a negative meniscus lens and a positive meniscus lens, the positive meniscus lens uses an aspheric surface having a curvature increasing toward the periphery, so that spherical aberration and astigmatism are used in the entire zoom range. Can be corrected in a well-balanced manner and coma at the wide-angle end can be corrected. In addition, by using an aspheric surface having a curvature increasing toward the periphery of the positive lens of the second lens group, mainly spherical aberration can be effectively corrected. When each of the second to fourth groups is composed of one lens as in the present embodiment, the second to fourth groups
Since it is difficult to select a single group as a focusing group from among the groups in terms of aberration correction, focusing is performed with multiple groups, or the first group is composed of two or more lenses, and focusing is performed with the first group. Is desirable.
【００２２】次に本発明の数値実施例を示す。数値実施
例においてＲｉは物体側より第ｉ番目のレンズ面の曲率
半径、Ｄｉは物体側より第ｉ番目のレンズ厚又は空気間
隔、Ｎｉとνｉは、各々物体側より順に第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 from the object side, Di is the i-th lens thickness or air spacing from the object side, and Ni and νi are the i-th lens surfaces in order from the object side. These are the refractive index of the glass and the Atsube number.
【００２３】数値実施例において非球面形状は、レンズ
面の曲率半径をＲとし、光軸方向を（光の進行方向）を
Ｘ軸とし、光軸と垂直方向をＹ軸とし、Ｂ、Ｃ、Ｄ、Ｅ
を各々非球面係数としたとき、In the numerical examples, the aspheric shape is such that the radius of curvature of the lens surface is R, the direction of the optical axis is the X axis (the traveling direction of light), the Y axis is the direction perpendicular to the optical axis, and B, C, D, E
Are each aspherical coefficients,
【００２４】[0024]
【外１】 なる式で表されるものである。[Outside 1] It is represented by the following formula.
【００２５】表−１に本発明の数値実施例と前述の条件
式（１）、（２）、（３）、（４）との関係を示す。Table 1 shows the relationship between the numerical examples of the present invention and the conditional expressions (1), (2), (3) and (4).
【００２６】[0026]
【外２】 [Outside 2]
【００２７】[0027]
【外３】 [Outside 3]
【００２８】[0028]
【外４】 [Outside 4]
【００２９】[0029]
【表１】 [Table 1]
【００３０】[0030]
【発明の効果】以上の如く、各群の屈折力を設定するこ
とにより、全変倍範囲にわたり高い光学性能を有した変
倍比２程度のレンズ枚数が少ないビデオカメラや写真用
カメラ等に好適な低コスト、小型軽量の変倍レンズを実
現できる。As described above, by setting the refractive power of each group, it is suitable for a video camera, a photographic camera or the like having a high optical performance over the entire zoom range and a small number of lenses having a zoom ratio of about 2. A low cost, compact, lightweight variable power lens can be realized.
【図１】本発明に関するズームレンズのレンズ断面図。FIG. 1 is a sectional view of a zoom lens according to the present invention.
【図２】数値実施例１の諸収差図。FIG. 2 is a diagram illustrating various aberrations of Numerical Example 1.
【図３】数値実施例２の諸収差図。FIG. 3 is a diagram illustrating various aberrations of Numerical Example 2.
【図４】数値実施例３の諸収差図。FIG. 4 is a diagram showing various aberrations of Numerical Example 3.
Ｉ 第１レンズ群 ＩＩ 第２レンズ群 ＩＩＩ 第３レンズ群 ＩＶ 第４レンズ群 ＳＣ 正弦条件 ΔＳ サジタル像面 ΔＭ メリディオナル像面 ｄ ｄ線 ｇ ｇ線 I First lens group II Second lens group III Third lens group IV Fourth lens group SC Sine condition ΔS Sagittal image plane ΔM Meridional image plane dd line gg line
Claims (3)
中固定の第１レンズ群、正の屈折力を有する第２レンズ
群、負の屈折力を有する第３レンズ群、正の屈折力を有
する第４レンズ群を有し、広角端から望遠端にかけて前
記第２レンズ群、第３レンズ群、第４レンズ群をそれぞ
れ物体側方向へ光軸上移動させて変倍を行う変倍レンズ
であって、前記第１レンズ群、第２レンズ群、第３レン
ズ群、望遠端における全系の焦点距離を各々ｆ I ，
ｆII，ｆIII ，ｆ T とするとき、 ｜ｆII／ｆIII｜＜１０．３＜（ｆ Ｉ ／ｆ T ） 2 ＜０．５ ０．０５＜（ｆ II ／ｆ T ） 2 ＜０．２ なる条件を満足することを特徴とする変倍レンズ。1. Magnification with negative refractive power in order from the object side
Middle fixed first lens group, second lens having positive refractive power
Group, third lens group with negative refractive power, with positive refractive power
A fourth lens group that moves from the wide-angle end to the telephoto end.
Each of the second lens group, the third lens group, and the fourth lens group
Variable magnification lens that moves on the optical axis toward the object side
And saidThe first lens group,Second lens group, third lens
Group, The whole system at the telephoto endThe focal length of eachf I ,
fII, FIII , F T | FII/ FIII| <10.3 <(f I / F T ) Two <0.5 0.05 <(f II / F T ) Two <0.2 A variable power lens characterized by satisfying the following conditions.
側へ凸の負メニスカスレンズと物体側へ凸の正メニスカ
スレンズを有し、該負レンズと正レンズの空気間隔を
Ｄ、広角端における全系の光学全長をｌとするとき、 ０．０３＜Ｄ／ｌ＜０．１２ なる条件を満足することを特徴とする請求項１記載の変
倍レンズ。2. The first lens group includes, in order from the object side, a negative meniscus lens convex to the object side and a positive meniscus lens convex to the object side, wherein the air distance between the negative lens and the positive lens is D, and the wide-angle end is 2. The variable power lens according to claim 1, wherein the following conditional expression is satisfied: 0.03 <D / l <0.12, where l is the total optical length of the entire system.
ォーカシングを行うことを特徴とする請求項１又は２い
ずれか１項記載の変倍レンズ。3. The variable power lens according to claim 1 , wherein focusing is performed by moving the first lens group on an optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28510393A JP3219574B2 (en) | 1993-11-15 | 1993-11-15 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28510393A JP3219574B2 (en) | 1993-11-15 | 1993-11-15 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07140390A JPH07140390A (en) | 1995-06-02 |
| JP3219574B2 true JP3219574B2 (en) | 2001-10-15 |
Family
ID=17687168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28510393A Expired - Fee Related JP3219574B2 (en) | 1993-11-15 | 1993-11-15 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3219574B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08152558A (en) * | 1993-11-25 | 1996-06-11 | Asahi Optical Co Ltd | Zoom lens |
| JP3478643B2 (en) * | 1995-07-31 | 2003-12-15 | キヤノン株式会社 | Photographing lens and imaging camera using the same |
| JP4499404B2 (en) * | 2003-12-12 | 2010-07-07 | オリンパス株式会社 | Variable magnification optical system and electronic apparatus using the same |
| JP4615852B2 (en) * | 2003-12-12 | 2011-01-19 | オリンパス株式会社 | Variable magnification optical system and electronic apparatus using the same |
| JP2006023437A (en) * | 2004-07-07 | 2006-01-26 | Olympus Corp | Variable power optical system and electronic apparatus using same |
| JP2006023438A (en) * | 2004-07-07 | 2006-01-26 | Olympus Corp | Variable power optical system and electronic apparatus using same |
| JP2006023439A (en) * | 2004-07-07 | 2006-01-26 | Olympus Corp | Variable power optical system and electronic apparatus using same |
| JP2017021060A (en) * | 2013-11-26 | 2017-01-26 | 株式会社ニコン | Zoom lens system, optical device and zoom lens system manufacturing method |
-
1993
- 1993-11-15 JP JP28510393A patent/JP3219574B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07140390A (en) | 1995-06-02 |
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