JP3360817B2 - Zoom lens system - Google Patents
Zoom lens systemInfo
- Publication number
- JP3360817B2 JP3360817B2 JP13440099A JP13440099A JP3360817B2 JP 3360817 B2 JP3360817 B2 JP 3360817B2 JP 13440099 A JP13440099 A JP 13440099A JP 13440099 A JP13440099 A JP 13440099A JP 3360817 B2 JP3360817 B2 JP 3360817B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- positive
- object side
- focal length
- negative
- 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
Links
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- Lenses (AREA)
Description
【０００１】[0001]
【技術分野】本発明は、スチルカメラ、ビデオカメラ等
の撮影レンズに用いて好適な４群構成のズームレンズ系
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens system having a four-group structure suitable for use as a photographing lens for still cameras, video cameras and the like.
【０００２】[0002]
【従来技術及びその問題点】特開平４−１４９４０２号
公報は、３群（実質的に４群）構成のズームレンズ系を
提案してる。このズームレンズ系は、短焦点距離端の半
画角が約３７°であり、さらなる広角化の要求には応え
られない。また像面側の大きく重量大なレンズ群をフォ
ーカシング群としているため、フォーカシング機構の負
担が大きく、ＡＦ化に不利である。特開平６−７５１６
７号公報も、４群構成のズームレンズ系を提案している
が、広角化が不充分である。2. Description of the Related Art Japanese Patent Application Laid-Open No. 4-149402 proposes a zoom lens system having a three-group (substantially four-group) structure. This zoom lens system has a half field angle of about 37 ° at the short focal length extremity and cannot meet the demand for further widening. Further, since the large and heavy lens group on the image plane side is used as the focusing group, the focusing mechanism has a large load, which is disadvantageous for AF. JP-A-6-7516
Japanese Patent Publication No. 7 also proposes a zoom lens system having a four-group configuration, but the widening of the angle is insufficient.
【０００３】[0003]
【発明の目的】本発明は、広角側の半画角が４２°前
後、ズーム比が３．５程度の広角を含むズームレンズ系
を得ることを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to obtain a zoom lens system including a wide angle with a wide half angle of view of about 42 ° and a zoom ratio of about 3.5.
【０００４】[0004]
【発明の概要】本発明は、物体側から順に、正の第１レ
ンズ群、負の第２レンズ群、正の第３レンズ群、及び正
の第４レンズ群からなり、短焦点距離端から長焦点距離
端へのズーミングに際し、全てのレンズ群が物体側へ移
動するズームレンズ系において、正の第１レンズ群は、
物体側から順に、負レンズと正レンズの貼り合せレンズ
と、物体側に凸のメニスカス正レンズとからなり、負の
第２レンズ群は、物体側から順に、物体側に凸のメニス
カス負レンズと、正レンズと負レンズの貼り合せレンズ
と、正レンズと、物体側が強い凹面の負レンズとからな
り、正の第３レンズ群は、物体側から順に、両凸の正レ
ンズと、物体側が強い凸面の正レンズと、負レンズとか
らなり、正の第４レンズ群は、物体側から順に、正レン
ズと、像面側が強い凹面の負レンズとからなり、物体距
離が無限物体距離から有限物体距離へ変化するとき、第
２レンズ群を物体側へ移動させてフォーカシングを行な
い、次の条件式（１）、（２）及び（３）を満足するこ
とを特徴とするズームレンズ系。
（１）−１．２３＜ｍ3-4W＜−１．０
（２）０．０２＜ｄ19／ｆｗ＜０．３０
（３）１．６＜ｎL13 ＜１．７６
但し、
ｍ3-4W；短焦点距離端における第３レンズ群と第４レン
ズ群の合成横倍率、
ｄ19；第３レンズ群中の物体側が強い凸面の正レンズと
負レンズとの間隔、
ｆｗ；短焦点距離端の全系の焦点距離、
ｎL13 ；第４レンズ群中の像面側が強い凹面の負レンズ
の屈折率、
である。SUMMARY OF THE INVENTION The present invention comprises, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group, from the short focal length end. In the zoom lens system in which all the lens units move to the object side during zooming to the long focal length extremity, the positive first lens unit is
A cemented lens consisting of a negative lens and a positive lens in order from the object side
And a positive meniscus lens on the object side,
The second lens group is a meniscus that is convex toward the object side in order from the object side.
Cas negative lens and cemented lens of positive lens and negative lens
And a positive lens and a negative lens with a strong concave surface on the object side.
The positive third lens group is a biconvex positive lens in order from the object side.
Lens, a convex positive lens with a strong object side, and a negative lens
The positive fourth lens group is a positive lens group in order from the object side.
When the object distance changes from an infinite object distance to a finite object distance, the second lens group is moved to the object side for focusing, and the following conditional expression ( A zoom lens system characterized by satisfying 1), 2) and 3). (1) -1.23 <m 3-4W < -1.0 (2) 0.02 <d 19 /fw<0.30 (3) 1.6 <n L13 <1.76 where, m 3- 4W : Composite lateral magnification of the third lens unit and the fourth lens unit at the short focal length extremity, d 19 : A positive lens having a strong convex surface on the object side in the third lens unit
The distance from the negative lens , fw; the focal length of the entire system at the short focal length extremity, n L13 ; the refractive index of the negative lens of the fourth lens group having a strong concave surface on the image plane side .
【０００５】より好ましくは、条件式（２）の代わり
に、次の条件式（２’）を満足させることが好ましい。
（２’）０．０４＜ｄ19／ｆｗ＜０．３０More preferably, the following conditional expression (2 ') is satisfied instead of conditional expression (2). (2 ′) 0.04 <d 19 /fw<0.30
【０００６】[0006]
【０００７】[0007]
【発明の実施形態】本発明による４群ズームレンズ系
は、図１、図５、図９、図１３、及び図１７に示すよう
に、物体側から順に、正の第１レンズ群１０、負の第２
レンズ群２０、絞りＳ、正の第３レンズ群３０、及び正
の第４レンズ群４０からなっており、短焦点距離端から
長焦点距離端へのズーミングに際し、全てのレンズ群が
互いの空気間隔を変化させながら物体側へ移動する。絞
りＳは、第３レンズ群３０と一体に移動する。フォーカ
シングは、物体距離が無限物体距離から有限物体距離へ
変化するとき、第２レンズ群を物体側へ移動させて行な
う。そして、図１、図５、図９、図１３、及び図１７の
各実施例に示すように、正の第１レンズ群１０は、物体
側から順に、負レンズＬ１と正レンズＬ２の貼り合せレ
ンズと、物体側に凸のメニスカス正レンズＬ３とからな
り、負の第２レンズ群２０は、物体側から順に、物体側
に凸のメニスカス負レンズＬ４と、正レンズＬ５と負レ
ンズＬ６の貼り合せレンズと、正レンズＬ７と、物体側
が強い凹面の負レンズＬ８とからなり、正の第３レンズ
群３０は、物体側から順に、両凸の正レンズＬ９と、物
体側が強い凸面の正レンズＬ１０と、負レンズＬ１１と
からなり、正の第４レンズ群４０は、物体側から順に、
正レンズＬ１２と、像面側が強い凹面の負レンズＬ１３
とからなり、全体で１３枚構成である。第２レンズ群２
０の最も物体側に位置する、物体側に凸のメニスカス負
レンズＬ４は、その物体側に、合成樹脂製の非球面膜Ｒ
を付着させたハイブリッドレンズである。BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIGS. 1, 5, 9, 13, and 17, a four-group zoom lens system according to the present invention comprises, in order from the object side, a positive first lens group 10 and a negative lens group 10. Second
It is composed of a lens group 20, a diaphragm S, a positive third lens group 30, and a positive fourth lens group 40, and when zooming from a short focal length end to a long focal length end, all the lens units are in air from each other. Move to the object side while changing the interval. The diaphragm S moves integrally with the third lens group 30. Focusing is performed by moving the second lens group toward the object side when the object distance changes from an infinite object distance to a finite object distance. Then, as shown in each of the embodiments of FIGS. 1, 5, 9, 13, and 17, the positive first lens group 10 is formed by bonding the negative lens L1 and the positive lens L2 in order from the object side. The negative second lens group 20 includes a lens and a meniscus positive lens L3 having a convex surface on the object side. The positive third lens group 30 includes, in order from the object side, a biconvex positive lens L9 and a positive lens having a strong convex surface on the object side. The positive fourth lens group 40, which includes L10 and a negative lens L11, is arranged in order from the object side.
Positive lens L12 and negative lens L13 having a strong concave surface on the image side
And consists of 13 sheets in total. Second lens group 2
The meniscus negative lens L4, which is located closest to the object side and has a convex surface on the object side, has an aspherical film R made of synthetic resin on the object side.
Is a hybrid lens to which is attached.
【０００８】条件式（１）は、広角端における第３レン
ズ群と第４レンズ群の合成横倍率ｍ 3-4Wについての条件
である。この合成横倍率ｍ3-4Wが、条件式（１）の上限
を越えて大きくなり−１に近づくと、第２レンズ群のズ
ーミングの際の移動軌跡がＵターンしてしまう。つま
り、第３レンズ群と第４レンズ群の合成横倍率が−１倍
近辺の焦点距離まで、第２レンズ群は像側に動き、その
後物体側に動くことになり、好ましくない。また第３レ
ンズ群と第４レンズ群の合成横倍率が−１倍になる焦点
距離を境に、第２レンズ群がＵターンするので、第３レ
ンズ群と第４レンズ群の合成横倍率が−１倍になる付近
では、第２レンズ群の移動量が少なくなりその結果、広
角端からわずかに望遠側へよった焦点距離領域で第２レ
ンズ群の位置の自由度が殆どなくなり、４群全てを動か
す４群ズームのメリットがなくなり、収差を良好に保て
なくなる。別言すると、第３レンズ群と第４レンズ群
は、主にメリジオナル像面の像面湾曲のオーバーを補正
するべく移動するが、条件式（１）の上限を越えると、
第３レンズ群、第４レンズ群の動く自由度がなくなって
しまう。Conditional expression (1) is the third lens at the wide-angle end.
Lateral magnification m of the second lens group and the fourth lens group 3-4WConditions for
Is. This composite lateral magnification m3-4WIs the upper limit of conditional expression (1)
If it becomes larger than -1 and approaches -1, the second lens group
The track of movement when making a arm makes a U-turn. Tsuma
Therefore, the combined lateral magnification of the 3rd and 4th lens groups is -1x.
The second lens group moves to the image side up to the focal length in the vicinity,
It will move to the rear object side, which is not preferable. Also the third
Focus where the combined lateral magnification of the lens group and the fourth lens group becomes -1
Since the second lens group makes a U-turn at the distance, the third lens group
Around the combined lateral magnification of the lens group and the fourth lens group becomes -1
Then, the amount of movement of the second lens group decreases and, as a result,
In the focal length range slightly from the corner to the telephoto side,
There is almost no degree of freedom in the position of the lens group, and all four groups are moved.
The advantages of the 4th lens zoom are eliminated, and good aberrations can be maintained.
Disappear. In other words, the third lens group and the fourth lens group
Mainly corrects over field curvature of the meridional field
Move as much as possible, but if the upper limit of conditional expression (1) is exceeded,
The freedom of movement of the 3rd and 4th lens groups has disappeared
I will end up.
【０００９】また、本発明では第２レンズ群によりフォ
ーカシングを行っており、第２レンズ群はズーミングと
フォーカシングの両方で動かなければならない。第２レ
ンズ群は、フォーカシングの際には有限物体距離の被写
体に対して常に物体側に動くが、ズーミングとフォーカ
シングで反対方向に第２レンズ群を動かさなければなら
ない場合が生じ、メカ構成が複雑になる。Further, in the present invention, focusing is performed by the second lens group, and the second lens group must move both during zooming and focusing. The second lens group always moves toward the object side with respect to a subject having a finite object distance during focusing, but sometimes the second lens group has to be moved in opposite directions for zooming and focusing, which complicates the mechanical structure. become.
【００１０】条件式（１）の下限を越えて合成横倍率ｍ
3-4Wが小さくなると、第３レンズ群と第４レンズ群で発
生する収差が大きくなり、やはりメリジオナル像面をオ
ーバーにしてしまう。Beyond the lower limit of conditional expression (1), the combined lateral magnification m
When 3-4W becomes small, the aberrations generated in the third lens group and the fourth lens group become large, and the meridional image plane is also overshot.
【００１１】条件式（２）は、第３レンズ群中の正レン
ズＬ１０と負レンズＬ１１の間隔ｄ 19についての条件で
ある。第３群レンズ群は絞りＳを物体側に持っており、
負レンズＬ１１は、絞りに近い負レンズであるため、球
面収差の補正の役割が大きい。Conditional expression (2) is a positive lens in the third lens group.
The distance d between the lens L10 and the negative lens L11 19In terms of
is there. The third lens group has a diaphragm S on the object side,
Since the negative lens L11 is a negative lens close to a diaphragm, it has a spherical shape.
The role of correcting surface aberration is great.
【００１２】条件式（２）の下限を越えて間隔ｄ19が小
さくなると、正レンズＬ１０から収束するように出る軸
上光束の負レンズＬ１１への入射高さが高くなるので、
正の球面収差が大となり、全系の球面収差が過剰に補正
され、オーバーとなってしまう。条件式（２）の下限を
０．０４にすると（条件式（２’））、負レンズＬ１１
での正の球面収差の発生をさらに少なく保つことができ
収差補正に有利である。If the distance d 19 becomes smaller than the lower limit of the conditional expression (2), the height of incidence of the axial light flux, which converges from the positive lens L10, on the negative lens L11 becomes high.
The positive spherical aberration becomes large, and the spherical aberration of the entire system is excessively corrected and becomes over. If the lower limit of conditional expression (2) is set to 0.04 (conditional expression (2 ′)), the negative lens L11
It is possible to keep the occurrence of positive spherical aberration at 1 to be further reduced, which is advantageous for aberration correction.
【００１３】また、球面収差の過剰補正が生じないよう
に、正レンズＬ１０の像側面の正のパワーを強くして負
の球面収差を生じるようにすると、正レンズＬ１０によ
る負と、負レンズＬ１１による正の大きな球面収差の打
消し合いになり誤差感度が高くなってしまい、製造が困
難になる。つまり、正レンズＬ１０と負レンズＬ１１の
僅かな間隔の誤差で球面収差が大きく変化し、僅かな偏
心誤差で大きな軸上コマ収差が発生する。これを防ぐよ
うに貼り合せにすると、貼り合せのコストが発生し高く
なってしまう。Further, so as not to cause excessive correction of the spherical aberration, the positive power of the image side surface of the positive lens L10 strongly to to produce a negative spherical aberration, a negative by the positive lens L10, a negative lens L11 Therefore, the large positive spherical aberrations cancel each other out, and the error sensitivity becomes high, which makes manufacturing difficult. That is, the spherical aberration greatly changes due to an error in a slight distance between the positive lens L10 and the negative lens L11, and a large axial coma aberration occurs due to a slight decentering error. If the bonding is performed so as to prevent this, the cost of the bonding occurs and the cost increases.
【００１４】条件式（２）の上限を越えて間隔ｄ19が大
きくなると、逆に球面収差がアンダーとなる。またレン
ズ全長が長くなる。条件式（３）は、第４レンズ群４０
中の最も像側の負レンズＬ１３の屈折率についての条件
である。条件式（３）の下限を越えて、負レンズＬ１３
の屈折率が小さくなると、同レンズ１３の負のパワーが
小さくなり、球面収差が補正できなくなる結果、球面収
差がアンダーに出る。またペッツバール和が大きくなり
像面がアンダーとなる。If the distance d 19 becomes larger than the upper limit of the conditional expression (2), the spherical aberration will become under. Moreover, the total lens length becomes long. Conditional expression (3) is defined by the fourth lens group 40.
This is a condition regarding the refractive index of the negative lens L13 closest to the image side. If the lower limit of conditional expression (3) is exceeded, the negative lens L13
If the refractive index of the lens becomes small, the negative power of the lens 13 becomes small, and the spherical aberration cannot be corrected. In addition, the Petzval sum increases and the image surface becomes under.
【００１５】条件式（３）の上限を越えて負レンズＬ１
３の屈折率が大きくなると、逆にペッツバール和が小と
なり像面湾曲がオーバーになってしまう。また負レンズ
Ｌ１３に非球面を設ける場合、条件式（３）を満足する
屈折率を持ちモールド成形しやすいガラス材料を得るこ
とは困難であり、非球面の製造に不利である。モールド
成形しやすいプラスチック材料では、条件式（３）を満
足するような屈折率の高いものは得られない。Beyond the upper limit of conditional expression (3), the negative lens L1
On the contrary, when the refractive index of 3 becomes large, the Petzval sum becomes small and the field curvature becomes excessive. Further, when an aspherical surface is provided on the negative lens L13, it is difficult to obtain a glass material having a refractive index which satisfies the conditional expression (3) and which is easy to mold, which is disadvantageous for manufacturing the aspherical surface. With a plastic material that can be easily molded, a material having a high refractive index that satisfies the conditional expression (3) cannot be obtained.
【００１６】次に、具体的な数値実施例を説明する。以
下の実施例の諸収差図中、ｄ線、ｇ線、及びｃ線は、そ
れぞれの波長の球面収差によって示される色収差及び倍
率色収差、Ｓはサジタル像の像面、Ｍはメリディオナル
像の像面を示している。また、表および図面中、FNOは
Ｆナンバー、f は焦点距離、W は半画角、fBはバックフ
ォーカス、面No. は、物体側から数えたレンズ各面の番
号、Ｒは曲率半径、Ｄはレンズ面間隔、Ｎd はｄ線に対
する屈折率、νd はアッベ数を示す。Next, concrete numerical examples will be described. In the various aberration diagrams of the following examples, d line, g line, and c line represent chromatic aberration and chromatic aberration of magnification indicated by spherical aberration of respective wavelengths, S is an image plane of a sagittal image, and M is an image plane of a meridional image. Is shown. In the tables and drawings, F NO is the F number, f is the focal length, W is the half angle of view, f B is the back focus, surface No. is the number of each lens surface counted from the object side, and R is the radius of curvature. , D is the lens surface distance, N d is the refractive index for the d-line, and ν d is the Abbe number.
【００１７】また、回転対称非球面は次式で定義され
る。
x=ch2/[1+[1-(1+K)c2h2]1/2]+A4h4+A6h6+A8h8+A10h10+A
12h12
（ｃは曲率（１／Ｒ）、ｈは光軸からの高さ、Ｋは円錐
係数、Aiはｉ次の非球面係数）The rotationally symmetric aspherical surface is defined by the following equation. x = ch 2 / [1+ [1- (1 + K) c 2 h 2 ] 1/2 ] + A4h 4 + A6h 6 + A8h 8 + A10h 10 + A
12h 12 ( c is the curvature ( 1 / R ), h is the height from the optical axis, K is the conical coefficient, and Ai is the i-th order aspherical coefficient)
【００１８】［実施例１］図１は、本発明によるズーム
レンズ系の実施例１のレンズ構成図、図２、図３、及び
図４はそれぞれ、図１のレンズ系の短焦点距離端、中間
焦点距離、及び長焦点距離端での諸収差図である。表１
はその数値データである。[Embodiment 1] FIG. 1 is a lens configuration diagram of Embodiment 1 of a zoom lens system according to the present invention, and FIGS. 2, 3 and 4 are respectively the short focal length end of the lens system of FIG. FIG. 7 is a diagram of various types of aberration at the intermediate focal length and the long focal length extremity. Table 1
Is the numerical data.
【００１９】[0019]
【表１】 FNO= 1:3.7-4.5-4.8 f = 24.89-45.02-86.80（ズーム比；3.48） W = 42.0-25.2-13.5 fB= 38.50-55.18-70.33 面 No. R D Nd νd 1 543.896 1.80 1.84666 23.8 2 80.101 5.74 1.77250 49.6 3 -1799.643 0.10 - - 4 47.517 4.80 1.77250 49.6 5 136.888 2.43-12.07-27.91 - - 6＊ 182.407 0.30 1.52630 51.1 7 110.488 1.30 1.83481 42.7 8 14.387 5.66 - - 9 -39.735 4.09 1.51742 52.4 10 -16.451 1.20 1.83481 42.7 11 -293.944 0.11 - - 12 52.860 4.23 1.84666 23.8 13 -24.828 0.23 - - 14 -22.260 1.20 1.80400 46.6 15 -276.363 14.86-6.44-1.00 - - 絞り - 1.20 - - 16 38.109 4.52 1.61800 63.4 17 -47.897 0.10 - - 18 21.740 4.40 1.48749 70.2 19 -635.520 2.94 - - 20 -35.529 1.20 1.84666 23.8 21 94.270 7.10-3.64-2.46 - - 22 43.110 5.00 1.48749 70.2 23 -21.256 0.10 - - 24＊ -1500.000 2.00 1.66910 55.4 25 40.922 - - - ＊は回転対称非球面を表す。 非球面データ（表示のない非球面係数は、0.00である）； No. 6;k=-1.0、A4= 0.1804×10-4、A6=-0.3640×10-7、A8=0.9700×10-10 No.24;k=-1.0、A4=-0.4270×10-4、A6=-0.5980×10-7、A8=-0.4940×10-9 [Table 1] F NO = 1: 3.7-4.5-4.8 f = 24.89-45.02-86.80 (zoom ratio; 3.48) W = 42.0-25.2-13.5 f B = 38.50-55.18-70.33 surface No. RDN d ν d 1 543.896 1.80 1.84666 23.8 2 80.101 5.74 1.77250 49.6 3 -1799.643 0.10--4 47.517 4.80 1.77250 49.6 5 136.888 2.43-12.07-27.91--6 * 182.407 0.30 1.52630 51.1 7 110.488 1.30 1.83481 42.7 8 14.387 5.66--9 -39.735 4.09 1.51742 52.4 10 -16.451 1.20 1.83481 42.7 11 -293.944 0.11--12 52.860 4.23 1.84666 23.8 13 -24.828 0.23--14 -22.260 1.20 1.80400 46.6 15 -276.363 14.86-6.44-1.00--Aperture-1.20--16 38.109 4.52 1.61800 63.4 17 -47.897 0.10--18 21.740 4.40 1.48749 70.2 19 -635.520 2.94--20 -35.529 1.20 1.84666 23.8 21 94.270 7.10-3.64-2.46--22 43.110 5.00 1.48749 70.2 23 -21.256 0.10--24 * -1500.000 2.00 1.66910 55.4 25 40.922---* represents a rotationally symmetric aspherical surface. Aspherical data (aspherical coefficient without display is 0.00); No. 6; k = -1.0, A4 = 0.1804 × 10 -4 , A6 = -0.3640 × 10 -7 , A8 = 0.9700 × 10 -10 No.24; k = -1.0, A4 = -0.4270 × 10 -4 , A6 = -0.5980 × 10 -7 , A8 = -0.4940 × 10 -9
【００２０】［実施例２］図５は、本発明によるズーム
レンズ系の実施例２のレンズ構成図、図６、図７、及び
図８はそれぞれ、図５のレンズ系の短焦点距離端、中間
焦点距離、及び長焦点距離端での諸収差図である。表２
はその数値データである。[Embodiment 2] FIG. 5 is a lens configuration diagram of Embodiment 2 of the zoom lens system according to the present invention, and FIGS. 6, 7, and 8 are respectively the short focal length end of the lens system of FIG. FIG. 7 is a diagram of various types of aberration at the intermediate focal length and the long focal length extremity. Table 2
Is the numerical data.
【００２１】[0021]
【表２】 FNO= 1:3.7-4.4-4.8 f = 24.89-45.00-86.80 （ズーム比；3.48） W = 42.1-25.2-13.5 fB= 38.50-55.11-70.30 面 No. R D Nd νd 1 438.437 1.80 1.84666 23.8 2 76.877 5.76 1.77250 49.6 3 14760.212 0.10 - - 4 47.988 4.81 1.77250 49.6 5 143.605 2.44-12.04-27.97 - - 6＊ 213.449 0.30 1.52630 51.1 7 118.197 1.30 1.83481 42.7 8 14.508 5.46 - - 9 -44.170 4.30 1.51742 52.4 10 -16.084 1.20 1.83481 42.7 11 -307.254 0.11 - - 12 51.461 4.23 1.84666 23.8 13 -24.965 0.21 - - 14 -22.485 1.20 1.80400 46.6 15 -414.046 14.79-6.41-1.00 - - 絞り - 1.20 - - 16 39.478 4.52 1.61800 63.4 17 -47.232 0.10 - - 18 21.826 4.40 1.48749 70.2 19 -48203.003 2.87 - - 20 -36.734 1.20 1.84666 23.8 21 100.040 7.29-3.86-2.67 - - 22 40.829 5.00 1.56883 56.3 23 -23.614 0.10 - - 24＊ -1500.000 2.00 1.72873 40.5 25 36.264 - - - ＊は回転対称非球面を表す。 非球面データ（表示のない非球面係数は、0.00である）； No. 6; k=-1.0、A4= 0.1860×10-4、A6=-0.3648×10-7、A8=0.9952×10-10、 No.24; k=-1.0、A4=-0.4012×10-4、A6=-0.5640×10-7、A8=-0.3565×10-9 [Table 2] F NO = 1: 3.7-4.4-4.8 f = 24.89-45.00-86.80 (zoom ratio; 3.48) W = 42.1-25.2-13.5 f B = 38.50-55.11-70.30 surface No. RDN d ν d 1 438.437 1.80 1.84666 23.8 2 76.877 5.76 1.77250 49.6 3 14760.212 0.10--4 47.988 4.81 1.77250 49.6 5 143.605 2.44-12.04-27.97--6 * 213.449 0.30 1.52630 51.1 7 118.197 1.30 1.83481 42.7 8 14.508 5.46--9 -44.170 4.30 1.51742 52.4 10 -16.084 1.20 1.83481 42.7 11 -307.254 0.11--12 51.461 4.23 1.84666 23.8 13 -24.965 0.21--14 -22.485 1.20 1.80400 46.6 15 -414.046 14.79-6.41-1.00--Aperture-1.20--16 39.478 4.52 1.61800 63.4 17 -47.232 0.10--18 21.826 4.40 1.48749 70.2 19 -48203.003 2.87--20 -36.734 1.20 1.84666 23.8 21 100.040 7.29-3.86-2.67--22 40.829 5.00 1.56883 56.3 23 -23.614 0.10--24 * -1500.000 2.00 1.72873 40.5 25 36.264---* represents a rotationally symmetric aspherical surface. Aspherical data (aspherical coefficient without display is 0.00); No. 6; k = -1.0, A4 = 0.1860 × 10 -4 , A6 = -0.3648 × 10 -7 , A8 = 0.9952 × 10 -10 , No.24; k = -1.0, A4 = -0.4012 × 10 -4 , A6 = -0.5640 × 10 -7 , A8 = -0.3565 × 10 -9
【００２２】［実施例３］図９は、本発明によるズーム
レンズ系の実施例３のレンズ構成図、図１０、図１１、
及び図１２はそれぞれ、図９のレンズ系の短焦点距離
端、中間焦点距離、及び長焦点距離端での諸収差図であ
る。表３はその数値データである。[Embodiment 3] FIG. 9 is a lens configuration diagram of Embodiment 3 of the zoom lens system according to the present invention, FIG. 10, FIG.
12 and FIG. 12 are graphs showing various aberrations of the lens system of FIG. 9 at the short focal length end, the intermediate focal length, and the long focal length end, respectively. Table 3 shows the numerical data.
【００２３】[0023]
【表３】 FNO= 1:3.7-4.5-4.8 f = 24.89-45.01-86.80（ズーム比；3.48） W = 41.8-25.1-13.5 fB= 38.50-55.25-70.50 面 No. R D Nd νd 1 304.533 1.80 1.84666 23.8 2 71.947 5.74 1.77250 49.6 3 978.953 0.10 - - 4 47.885 4.81 1.77250 49.6 5 142.776 2.38-11.98-27.82 - - 6＊ 189.012 0.30 1.52630 51.1 7 109.795 1.30 1.83481 42.7 8 14.272 5.67 - - 9 -40.759 4.11 1.51742 52.4 10 -16.569 1.20 1.83481 42.7 11 -339.872 0.11 - - 12 51.771 4.23 1.84666 23.8 13 -25.381 0.24 - - 14 -22.540 1.20 1.80400 46.6 15 -255.980 14.88-6.44-1.00 - - 絞り - 1.20 - - 16 38.442 4.52 1.61800 63.4 17 -48.558 0.10 - - 18 21.660 4.40 1.48749 70.2 19 -609.714 2.91 - - 20 -36.364 1.20 1.84666 23.8 21 93.382 7.30-3.84-2.65 - - 22 43.247 5.00 1.51633 64.1 23 -22.164 0.10 - - 24＊ -1488.534 2.00 1.74330 49.3 25 42.337 - - - ＊は回転対称非球面を表す。 非球面データ（表示のない非球面係数は、0.00である）； No. 6; k=-1.0、A4= 0.1888×10-4、A6=-0.3622×10-7、A8=0.9206×10-10、 No.24; k=-1.0、A4=-0.3883×10-4、A6=-0.5756×10-7、A8=-0.4019×10-9 [Table 3] F NO = 1: 3.7-4.5-4.8 f = 24.89-45.01-86.80 (zoom ratio; 3.48) W = 41.8-25.1-13.5 f B = 38.50-55.25-70.50 No. RDN d ν d 1 304.533 1.80 1.84666 23.8 2 71.947 5.74 1.77250 49.6 3 978.953 0.10--4 47.885 4.81 1.77250 49.6 5 142.776 2.38-11.98-27.82--6 * 189.012 0.30 1.52630 51.1 7 109.795 1.30 1.83481 42.7 8 14.272 5.67--9 -40.759 4.11 1.51742 52.4 10 -16.569 1.20 1.83481 42.7 11 -339.872 0.11--12 51.771 4.23 1.84666 23.8 13 -25.381 0.24--14 -22.540 1.20 1.80400 46.6 15 -255.980 14.88-6.44-1.00--Aperture-1.20--16 38.442 4.52 1.61800 63.4 17 -48.558 0.10--18 21.660 4.40 1.48749 70.2 19 -609.714 2.91--20 -36.364 1.20 1.84666 23.8 21 93.382 7.30-3.84-2.65--22 43.247 5.00 1.51633 64.1 23 -22.164 0.10--24 * -1488.534 2.00 1.74330 49.3 25 42.337---* represents a rotationally symmetric aspherical surface. Aspherical data (Aspherical coefficient without indication is 0.00); No. 6; k = -1.0, A4 = 0.1888 × 10 -4 , A6 = -0.3622 × 10 -7 , A8 = 0.9206 × 10 -10 , No.24; k = -1.0, A4 = -0.3883 × 10 -4 , A6 = -0.5756 × 10 -7 , A8 = -0.4019 × 10 -9
【００２４】［実施例４］図１３は、本発明によるズー
ムレンズ系の実施例４のレンズ構成図、図１４、図１
５、及び図１６はそれぞれ、図１３のレンズ系の短焦点
距離端、中間焦点距離、及び長焦点距離端での諸収差図
である。表４はその数値データである。[Embodiment 4] FIG. 13 is a lens configuration diagram of Embodiment 4 of the zoom lens system according to the present invention, FIG. 14 and FIG.
5 and 16 are graphs showing various aberrations at the short focal length end, the intermediate focal length end, and the long focal length end of the lens system of FIG. 13, respectively. Table 4 shows the numerical data.
【００２５】[0025]
【表４】 FNO= 1:3.7-4.5-4.8 f = 24.91-45.02-86.67（ズーム比；3.48） W = 41.8-25.1-13.5 fB= 38.49-55.08-70.50 面 No. R D Nd νd 1 445.920 1.80 1.84666 23.8 2 81.224 5.75 1.77250 49.6 3 -2385.674 0.10 - - 4 47.974 4.73 1.77250 49.6 5 128.252 2.45-12.20-28.21 - - 6＊ 159.750 0.30 1.52630 51.1 7 102.000 1.30 1.83481 42.7 8 14.372 5.73 - - 9 -40.949 4.85 1.51742 52.4 10 -16.570 1.20 1.83481 42.7 11 -234.000 0.11 - - 12 52.969 4.23 1.84666 23.8 13 -26.250 0.23 - - 14 -23.440 1.20 1.80400 46.6 15 -354.600 15.21-6.58-1.00 - - 絞り - 1.20 - - 16 37.780 4.52 1.61800 63.4 17 -46.694 0.10 - - 18 21.730 4.40 1.48749 70.2 19 600.000 2.50 - - 20 -38.754 1.20 1.84666 23.8 21 90.467 7.14-4.02-2.79 - - 22 42.227 5.00 1.60311 60.7 23 -24.140 0.10 - - 24＊ -376.147 2.00 1.75041 45.4 25 35.000 - - - ＊は回転対称非球面を表す。 非球面データ（表示のない非球面係数は、0.00である）； No. 6; k=-1.0、A4= 0.1909×10-4、A6=-0.4356×10-7、A8=0.1000×10-9、 No.24; k=-1.0、A4=-0.4099×10-4、A6=-0.5540×10-7、A8=-0.3626×10-9 [Table 4] F NO = 1: 3.7-4.5-4.8 f = 24.91-45.02-86.67 (zoom ratio; 3.48) W = 41.8-25.1-13.5 f B = 38.49-55.08-70.50 surface No. RDN d ν d 1 445.920 1.80 1.84666 23.8 2 81.224 5.75 1.77250 49.6 3 -2385.674 0.10--4 47.974 4.73 1.77250 49.6 5 128.252 2.45-12.20-28.21--6 * 159.750 0.30 1.52630 51.1 7 102.000 1.30 1.83481 42.7 8 14.372 5.73--9 -40.949 4.85 1.574 52.4 10 -16.570 1.20 1.83481 42.7 11 -234.000 0.11--12 52.969 4.23 1.84666 23.8 13 -26.250 0.23--14 -23.440 1.20 1.80400 46.6 15 -354.600 15.21-6.58-1.00--Aperture-1.20--16 37.780 4.52 1.61800 63.4 17 -46.694 0.10--18 21.730 4.40 1.48749 70.2 19 600.000 2.50--20 -38.754 1.20 1.84666 23.8 21 90.467 7.14-4.02-2.79--22 42.227 5.00 1.60311 60.7 23 -24.140 0.10--24 * -376.147 2.00 1.75041 45.4 25 35.000---* represents a rotationally symmetric aspherical surface. Aspherical data (aspherical coefficient without display is 0.00); No. 6; k = -1.0, A4 = 0.1909 × 10 -4 , A6 = -0.4356 × 10 -7 , A8 = 0.1000 × 10 -9 , No.24; k = -1.0, A4 = -0.4099 × 10 -4 , A6 = -0.5540 × 10 -7 , A8 = -0.3626 × 10 -9
【００２６】［実施例５］図１７は、本発明によるズー
ムレンズ系の実施例５のレンズ構成図、図１８、図１
９、及び図２０はそれぞれ、図１７のレンズ系の短焦点
距離端、中間焦点距離、及び長焦点距離端での諸収差図
である。表５はその数値データである。[Embodiment 5] FIG. 17 is a lens configuration diagram of Embodiment 5 of the zoom lens system according to the present invention, FIG. 18, and FIG.
9 and 20 are graphs showing various aberrations at the short focal length end, the intermediate focal length end, and the long focal length end of the lens system of FIG. 17, respectively. Table 5 shows the numerical data.
【００２７】[0027]
【表５】 FNO= 1:3.7-4.3-4.8 f = 24.89-45.00-86.80（ズーム比；3.48） W = 41.9-25.2-13.5 fB= 38.50-55.07-70.29 面 No. R D Nd νd 1 293.773 1.80 1.84666 23.8 2 71.519 5.63 1.77250 49.6 3 757.805 0.10 - - 4 47.912 4.85 1.77250 49.6 5 146.252 2.41-11.98-27.82 - - 6＊ 224.463 0.30 1.52630 51.1 7 116.495 1.30 1.83481 42.7 8 14.477 5.51 - - 9 -44.915 4.38 1.51742 52.4 10 -15.807 1.20 1.83481 42.7 11 -307.419 0.11 - - 12 52.592 4.23 1.84666 23.8 13 -24.927 0.22 - - 14 -22.427 1.20 1.80400 46.6 15 -327.320 14.77-6.41-1.00 - - 絞り - 1.20 - - 16 41.604 4.17 1.61800 63.4 17 -47.489 0.10 - - 18 21.796 4.30 1.48749 70.2 19 -883.536 2.88 - - 20 -37.521 1.20 1.84666 23.8 21 101.004 7.37-3.97-2.74 - - 22 39.208 5.00 1.56883 56.3 23 -24.410 0.10 - - 24＊ 512.605 2.00 1.72750 40.3 25 32.894 - - - ＊は回転対称非球面を表す。 非球面データ（表示のない非球面係数は、0.00である）； No. 6; k=-1.0、A4= 0.1971×10-4、A6=-0.3839×10-7、A8=0.1078×10-9、 No.24; k=-1.0、A4=-0.3960×10-4、A6=-0.5592×10-7、A8=-0.3344×10-9 [Table 5] F NO = 1: 3.7-4.3-4.8 f = 24.89-45.00-86.80 (zoom ratio; 3.48) W = 41.9-25.2-13.5 f B = 38.50-55.07-70.29 surface No. RDN d ν d 1 293.773 1.80 1.84666 23.8 2 71.519 5.63 1.77250 49.6 3 757.805 0.10--4 47.912 4.85 1.77250 49.6 5 146.252 2.41-11.98-27.82--6 * 224.463 0.30 1.52630 51.1 7 116.495 1.30 1.83481 42.7 8 14.477 5.51--9 -44.915 5.38 1.51742 10 -15.807 1.20 1.83481 42.7 11 -307.419 0.11--12 52.592 4.23 1.84666 23.8 13 -24.927 0.22--14 -22.427 1.20 1.80400 46.6 15 -327.320 14.77-6.41-1.00--Aperture-1.20--16 41.604 4.17 1.61800 63.4 17 -47.489 0.10--18 21.796 4.30 1.48749 70.2 19 -883.536 2.88--20 -37.521 1.20 1.84666 23.8 21 101.004 7.37-3.97-2.74--22 39.208 5.00 1.56883 56.3 23 -24.410 0.10--24 * 512.605 2.00 1.72750 40.3 25 32.894 ---* Represents a rotationally symmetric aspherical surface. Aspherical data (aspherical coefficient without display is 0.00); No. 6; k = -1.0, A4 = 0.1971 × 10 -4 , A6 = -0.3839 × 10 -7 , A8 = 0.1078 × 10 -9 , No.24; k = -1.0, A4 = -0.3960 × 10 -4 , A6 = -0.5592 × 10 -7 , A8 = -0.3344 × 10 -9
【００２８】次に、実施例の各条件式に対する値を表６
に示す。Next, the values for each conditional expression of the embodiment are shown in Table 6.
Shown in.
【表６】
条件式（１） 条件式（２） 条件式（３）
実施例１ −１．１９３ ０．１１８ １．６６９１０
実施例２ −１．１９３ ０．１１５ １．７２８７３
実施例３ −１．１９２ ０．１１７ １．７４３３０
実施例４ −１．１７５ ０．１００ １．７５０４１
実施例５ −１．１９４ ０．１１６ １．７２７５０
各実施例は、条件式（１）、（２）、（３）を満足して
おり、諸収差も比較的よく補正されている。Table 6 Conditional Expression (1) Conditional Expression (2) Conditional Expression (3) Example 1-1.193 0.118 1.66910 Example 2-1.193 0.115 1.72873 Example 3-1 .192 0.117 1.74330 Example 4-1.175 0.100 1.75041 Example 5-1.194 0.116 1.72750 Each example is conditional expression (1), (2), (. 3) is satisfied, and various aberrations are relatively well corrected.
【００２９】[0029]
【発明の効果】本発明によれば、広角側の半画角が４２
°前後、ズーム比が３．５程度の広角を含む４群構成の
ズームレンズ系を得ることができる。According to the present invention, the half angle of view on the wide angle side is 42
It is possible to obtain a zoom lens system having a four-group configuration including a wide angle with a zoom ratio of about 3.5.
【図１】本発明によるズームレンズ系の第１実施例のレ
ンズ構成図である。FIG. 1 is a lens configuration diagram of a first embodiment of a zoom lens system according to the present invention.
【図２】図１のズームレンズ系の短焦点距離端での諸収
差図である。FIG. 2 is a diagram of various types of aberration at the short focal length extremity of the zoom lens system in FIG.
【図３】図１のズームレンズ系の中間焦点距離での諸収
差図である。FIG. 3 is a diagram of various types of aberration at the intermediate focal length of the zoom lens system in FIG.
【図４】図１のズームレンズ系の長焦点距離端での諸収
差図である。FIG. 4 is a diagram of various types of aberration at the long focal length extremity of the zoom lens system in FIG. 1.
【図５】本発明によるズームレンズ系の第２実施例のレ
ンズ構成図である。FIG. 5 is a lens configuration diagram of a second embodiment of the zoom lens system according to the present invention.
【図６】図５のズームレンズ系の短焦点距離端での諸収
差図である。FIG. 6 is a diagram of various types of aberration at the short focal length extremity of the zoom lens system in FIG. 5;
【図７】図５のズームレンズ系の中間焦点距離での諸収
差図である。7 is a diagram of various types of aberration at the intermediate focal length of the zoom lens system in FIG.
【図８】図５のズームレンズ系の長焦点距離端での諸収
差図である。8 is a diagram of various types of aberration at the long focal length extremity of the zoom lens system in FIG.
【図９】本発明によるズームレンズ系の第３実施例のレ
ンズ構成図である。FIG. 9 is a lens configuration diagram of a third embodiment of the zoom lens system according to the present invention.
【図１０】図９のズームレンズ系の短焦点距離端での諸
収差図である。FIG. 10 is a diagram of various types of aberration at the short focal length extremity of the zoom lens system in FIG. 9;
【図１１】図９のズームレンズ系の中間焦点距離での諸
収差図である。11 is a diagram of various types of aberration at the intermediate focal length of the zoom lens system in FIG.
【図１２】図９のズームレンズ系の長焦点距離端での諸
収差図である。12 is a diagram of various types of aberration at the long focal length extremity of the zoom lens system in FIG.
【図１３】本発明によるズームレンズ系の第４実施例の
レンズ構成図である。FIG. 13 is a lens configuration diagram of a fourth example of the zoom lens system according to the present invention.
【図１４】図１３のズームレンズ系の短焦点距離端での
諸収差図である。14 is a diagram of various types of aberration at the short focal length extremity of the zoom lens system in FIG.
【図１５】図１３のズームレンズ系の中間焦点距離での
諸収差図である。15 is a diagram of various types of aberration at the intermediate focal length of the zoom lens system in FIG.
【図１６】図１３のズームレンズ系の長焦点距離端での
諸収差図である。16 is a diagram of various types of aberration at the long focal length extremity of the zoom lens system in FIG.
【図１７】本発明によるズームレンズ系の第５実施例の
レンズ構成図である。FIG. 17 is a lens configuration diagram of a fifth example of the zoom lens system according to the present invention.
【図１８】図１７のズームレンズ系の短焦点距離端での
諸収差図である。18 is a diagram of various types of aberration at the short focal length extremity of the zoom lens system in FIG.
【図１９】図１７のズームレンズ系の中間焦点距離での
諸収差図である。19 is a diagram of various types of aberration at the intermediate focal length of the zoom lens system in FIG.
【図２０】図１７のズームレンズ系の長焦点距離端での
諸収差図である。20 is a diagram of various types of aberration at the long focal length extremity of the zoom lens system in FIG.
【図２１】本発明によるズームレンズ系の簡易移動図で
ある。FIG. 21 is a simplified movement diagram of the zoom lens system according to the present invention.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−180423（ＪＰ，Ａ) 特開 平６−75167（ＪＰ，Ａ) 特開 平８−86963（ＪＰ，Ａ) 特開 平６−34886（ＪＰ，Ａ) 特開 平４−162009（ＪＰ，Ａ) 特開 平１−285911（ＪＰ，Ａ) 特開 昭64−78210（ＪＰ，Ａ) 特開 昭60−79319（ＪＰ，Ａ) 特開 昭57−5012（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 15/20 ─────────────────────────────────────────────────── --- Continuation of front page (56) References JP-A-6-180423 (JP, A) JP-A-6-75167 (JP, A) JP-A-8-86963 (JP, A) JP-A-6- 34886 (JP, A) JP 4-162009 (JP, A) JP 1-285911 (JP, A) JP 64-78210 (JP, A) JP 60-79319 (JP, A) JP 57-5012 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) G02B 15/20
Claims (2)
の第２レンズ群、正の第３レンズ群、及び正の第４レン
ズ群からなり、短焦点距離端から長焦点距離端へのズー
ミングに際し、全てのレンズ群が物体側へ移動するズー
ムレンズ系において、正の第１レンズ群は、物体側から順に、負レンズと正レ
ンズの貼り合せレンズと、物体側に凸のメニスカス正レ
ンズとからなり、 負の第２レンズ群は、物体側から順に、物体側に凸のメ
ニスカス負レンズと、正レンズと負レンズの貼り合せレ
ンズと、正レンズと、物体側が強い凹面の負レンズとか
らなり、 正の第３レンズ群は、物体側から順に、両凸の正レンズ
と、物体側が強い凸面の正レンズと、負レンズとからな
り、 正の第４レンズ群は、物体側から順に、正レンズと、像
面側が強い凹面の負レンズとからなり、 物体距離が無限物体距離から有限物体距離へ変化すると
き、第２レンズ群を物体側へ移動させてフォーカシング
を行ない、 次の条件式（１）、（２）及び（３）を満足することを
特徴とするズームレンズ系。 （１）−１．２３＜ｍ3-4W＜−１．０ （２）０．０２＜ｄ19／ｆｗ＜０．３０ （３）１．６＜ｎL13 ＜１．７６ 但し、 ｍ3-4W；短焦点距離端における第３レンズ群と第４レン
ズ群の合成横倍率、 ｄ19；第３レンズ群中の物体側が強い凸面の正レンズと
負レンズとの間隔、 ｆｗ；短焦点距離端の全系の焦点距離、 ｎL13 ；第４レンズ群中の像面側が強い凹面の負レンズ
の屈折率。1. A positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group in order from the object side. The short focal length end to the long focal length end. In the zoom lens system in which all the lens units move to the object side during zooming, the positive first lens unit includes a negative lens and a positive lens unit in order from the object side.
Lens and a meniscus positive lens convex on the object side.
The negative second lens group is a lens having a convex surface on the object side in order from the object side.
Niscus negative lens and cemented lens of positive lens and negative lens
Lens, a positive lens, and a concave negative lens with a strong object side.
The positive third lens group is a biconvex positive lens in order from the object side.
And a positive lens with a strong convex surface on the object side and a negative lens.
The positive fourth lens group includes, in order from the object side, a positive lens and an image.
When the object distance changes from an infinite object distance to a finite object distance, the second lens group is moved to the object side for focusing, and the following conditional expression (1), ( A zoom lens system characterized by satisfying 2) and 3). (1) -1.23 <m 3-4W < -1.0 (2) 0.02 <d 19 /fw<0.30 (3) 1.6 <n L13 <1.76 where, m 3- 4W : Composite lateral magnification of the third lens unit and the fourth lens unit at the short focal length extremity, d 19 : A positive lens having a strong convex surface on the object side in the third lens unit
Distance from the negative lens , fw; focal length of the entire system at the short focal length end, n L13 : refractive index of the negative lens having a strong concave image surface side in the fourth lens group.
て、次の条件式（２’）を満足するズームレンズ系。 （２’）０．０４＜ｄ19／ｆｗ＜０．３０2. The zoom lens system according to claim 1, wherein the following conditional expression (2 ′) is satisfied. (2 ′) 0.04 <d 19 /fw<0.30
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13440099A JP3360817B2 (en) | 1998-06-16 | 1999-05-14 | Zoom lens system |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-168917 | 1998-06-16 | ||
| JP16891798 | 1998-06-16 | ||
| JP13440099A JP3360817B2 (en) | 1998-06-16 | 1999-05-14 | Zoom lens system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000075204A JP2000075204A (en) | 2000-03-14 |
| JP3360817B2 true JP3360817B2 (en) | 2003-01-07 |
Family
ID=26468527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13440099A Expired - Fee Related JP3360817B2 (en) | 1998-06-16 | 1999-05-14 | Zoom lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3360817B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4630424B2 (en) * | 2000-06-22 | 2011-02-09 | キヤノン株式会社 | Zoom lens and optical apparatus having the same |
| US6621643B2 (en) | 2001-04-25 | 2003-09-16 | Nikon Corporation | Zoom lens system |
| JP4592293B2 (en) * | 2004-01-20 | 2010-12-01 | 株式会社栃木ニコン | Variable magnification lens |
| JP4319582B2 (en) | 2004-05-12 | 2009-08-26 | Ｈｏｙａ株式会社 | Zoom lens system |
| JP5015514B2 (en) * | 2006-06-22 | 2012-08-29 | 株式会社リコー | Zoom lens, imaging device, and portable information terminal device |
| JP5540515B2 (en) * | 2009-01-30 | 2014-07-02 | 株式会社ニコン | Variable magnification optical system and optical apparatus having the variable magnification optical system |
-
1999
- 1999-05-14 JP JP13440099A patent/JP3360817B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000075204A (en) | 2000-03-14 |
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