JPS6049885B2 - Wide-angle zoom lens system - Google Patents
Wide-angle zoom lens systemInfo
- Publication number
- JPS6049885B2 JPS6049885B2 JP58005649A JP564983A JPS6049885B2 JP S6049885 B2 JPS6049885 B2 JP S6049885B2 JP 58005649 A JP58005649 A JP 58005649A JP 564983 A JP564983 A JP 564983A JP S6049885 B2 JPS6049885 B2 JP S6049885B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- positive
- object side
- meniscus lens
- group
- 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
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
- G02B15/1425—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being negative
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Description
【発明の詳細な説明】
本発明は発散レンズ群が先行するズームレンズに関する
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zoom lens preceded by a diverging lens group.
従来、この種の発散レンズ群が先行するズームレンズは
逆望遠型のパワー配置となるので、広角を含む場合には
有利であるが、その反面、球面収差やコマ収差の変動が
大きく、歪曲収差は短焦点距離側で著しく負になりがち
であつた。Conventionally, zoom lenses that are preceded by this type of diverging lens group have an inverted telephoto power arrangement, which is advantageous for wide-angle applications, but on the other hand, spherical aberration and coma aberration fluctuate greatly, and distortion aberration occurs. tended to be significantly negative at short focal lengths.
そして、諸収差を全て良好に補正しようとするときには
発散レンズ群と、それにつづく収斂レンズ群との焦点距
離を大きくとつて、再訂の各成分の収差補正の負担を軽
くしなければならないとされていた。そのため全体の形
状は大きくなり、また再訂の移動量は増えてしまい、実
用となり難かつた。本発明は新たな別のタイプのレンズ
構成を採用することによつて、前述の欠点を除去し、レ
ンズ・形状を小型に保ちつつ、諸収差をバランス良く補
正し、特に歪曲収差について、従来のものより著しく軽
減させたズームレンズを提供することを目的とし、さら
には、最短焦点距離が740、ズーム比2倍以上で、か
つ、口径比3、進度のものを実現したものである。本発
明によるレンズ系では、物体側からみて発散レンズ群の
前群と、収斂レンズ群の後群との2群より構成し、再訂
を光軸上て槻械的に移動させることによつて変倍を行な
うものである。In order to effectively correct all aberrations, it is considered necessary to increase the focal length of the diverging lens group and the converging lens group that follows it to reduce the burden of aberration correction for each component of the revision. Ta. As a result, the overall shape became larger and the amount of movement during revision increased, making it difficult to put it into practical use. By adopting a new and different type of lens configuration, the present invention eliminates the above-mentioned drawbacks and corrects various aberrations in a well-balanced manner while keeping the lens shape small. The objective is to provide a zoom lens with a significantly reduced weight compared to the conventional zoom lens, and furthermore, it has a minimum focal length of 740 mm, a zoom ratio of 2 times or more, an aperture ratio of 3, and a progressive speed. The lens system according to the present invention is composed of two groups, the front group of the diverging lens group and the rear group of the converging lens group, when viewed from the object side, and the lens system can be changed by mechanically moving the lens along the optical axis. It is a double act.
そしJて、前群である発散レンズ群を物体側から順次、
像側に凹面を向けた第1の負メニスカスレンズ、同じく
像側に凹面を向けた第2の負メニスカスレンズ、物体側
に凸な第1の正メニスカスレンズの互いに分離した4−
Dの成分より構成し、後群てあ・る収斂レンズ群を物体
側から順次、第2の正レンズ、物体側に凸な第2の正メ
ニスカスレンズ、物体側に凸な第3の正メニスカスレン
ズ、両日レンズ、像側に凸な第4の正メニスカスレンズ
、第3の正レンズの互いに分離した6つの成分により構
成している。以下に、これらのレンズ成分の配置につい
ての意義を記載する。Then, sequentially insert the front lens group, which is the diverging lens group, from the object side.
A first negative meniscus lens with a concave surface facing the image side, a second negative meniscus lens with a concave surface facing the image side, and a first positive meniscus lens with a convex surface facing the object side, separated from each other.
The rear group consists of a convergent lens group consisting of the component D, which includes, in order from the object side, a second positive lens, a second positive meniscus lens convex to the object side, and a third positive meniscus lens convex to the object side. It is composed of six components separated from each other: a lens, a double lens, a fourth positive meniscus lens convex toward the image side, and a third positive lens. The significance of the arrangement of these lens components will be described below.
発散レンズ群の第1の正ンズは、本発明によるズームレ
ンズ最大の特徴であり、短焦点距離側での歪曲収差の補
正に必要欠くでからざる成分である。その第1の正レン
ズの焦点距離をFlFとし発散レンズ群全体の焦点距離
をf1とすればを満足することが望ましい。The first positive lens in the diverging lens group is the most important feature of the zoom lens according to the present invention, and is an indispensable component for correcting distortion on the short focal length side. If the focal length of the first positive lens is FlF, and the focal length of the entire diverging lens group is f1, it is desirable to satisfy the following.
下限1.2より小さくなると第1の正レンズのパワーが
強くなりすぎ長焦点距離側の球面収差の補正ができなく
なる。又上限より大きいとたとえ第1の正レンズ、及び
後続の負レンズのペンディングを考慮しても望むべく歪
曲収差は得られない。そして、さらに広画角にするため
には、画角の3乗に比例して増大する歪曲収差の補正を
しなければならい。そのために、発散レンズ群の中の2
つの負成分はすべて線側に対して凹なメニスカス形状が
必要であり、この2つの負成分の像側の曲率半径を物体
側から順にR4,R6とするとき、IR4l〈1R61
とすることにより、広角化に対応した発散レンズ群を構
成することができる。更に、第2の負レンズと第1の正
メニスカスレンズの間隔をDFとすると0.05≦DF
/1f11≦0.2
を満足することがこの発散レンズ群を厚レンズ化して最
短焦点距離と最長焦点距離における球面収差の変動と像
面湾曲の変動を同時に補正可能ならしめている。If the lower limit is less than 1.2, the power of the first positive lens becomes too strong, making it impossible to correct spherical aberration on the long focal length side. If it is larger than the upper limit, the desired distortion cannot be obtained even if the pending effects of the first positive lens and the subsequent negative lens are taken into consideration. In order to further widen the angle of view, it is necessary to correct distortion, which increases in proportion to the cube of the angle of view. For this purpose, two of the diverging lens groups
All of the two negative components must have a meniscus shape that is concave with respect to the line side, and when the radii of curvature on the image side of these two negative components are R4 and R6 in order from the object side, IR4l<1R61
By doing so, it is possible to configure a diverging lens group that is compatible with a wide angle. Furthermore, if the distance between the second negative lens and the first positive meniscus lens is DF, then 0.05≦DF.
Satisfying /1f11≦0.2 makes it possible to simultaneously correct variations in spherical aberration and variations in field curvature at the shortest focal length and longest focal length by making the diverging lens group a thick lens.
下限をはづれるとこの効果がなくなり最短、最長のバラ
ンスがとれなくなり、上限を超えると発散群が厚レンズ
化になりすぎ主平面が発散レンズの奥深く入り込んで収
斂νンズ群の移動範囲が制限され、ズーム比がとれなく
なる。また、これによつて後群の収斂レンズ群も、さら
に広角化に耐え得るものにしなくてはならない。この要
請から収斂群において、像側に凸な正メニス・カスレン
ズと、第3の正レンズとは、まとめて1つの正レンズ成
分としても可能であつたところを2成分に分割したもの
で、これにより、歪曲収差に正にもたらす効果を出し、
かつ、像面湾曲を良好に補正することができた。以上の
ような構成とすれば、この種のズームレンズの基本形は
定まり、さらに、広角になると発生しがちな高次の色収
差を補正するために各成分の微細な構造を変化させるだ
けで、よソー層高性能な広角ズームレンズを達成するこ
とができる。If the lower limit is exceeded, this effect disappears and the shortest and longest distances cannot be balanced, and if the upper limit is exceeded, the diverging lens group becomes too thick and the principal plane penetrates deep into the diverging lens, limiting the range of movement of the converging ν lens group. and the zoom ratio cannot be adjusted. Additionally, as a result, the rear convergent lens group must also be made capable of withstanding wider angles. Based on this requirement, in the convergent group, the positive meniscus lens convex to the image side and the third positive lens are divided into two components, which could have been combined into one positive lens component. This produces a positive effect on distortion,
In addition, it was possible to satisfactorily correct field curvature. With the above configuration, the basic shape of this type of zoom lens is determined, and furthermore, in order to correct the high-order chromatic aberration that tends to occur with wide-angle lenses, it is possible to create a zoom lens by simply changing the fine structure of each component. So layer can achieve high performance wide-angle zoom lens.
以下に本発明による好適な実施例について説明する。実
施例1は本発明の基本的なものである。Preferred embodiments according to the present invention will be described below. Example 1 is the basic of the invention.
本実施例によるレンズ構成の最短焦点距離状態を第1図
に、その最短焦点距離状態、最長焦点距離状態、中間焦
点距離状態での諸収差を第4図に示す、諸収差は非常に
良くバランスされており、特に歪曲収差が非常に小さく
なつていることがわかる。本実施例の諸元は次のとおり
である。第2図にレンズ構成の最短焦点距離状態を示さ
れている。Figure 1 shows the shortest focal length state of the lens configuration according to this example, and Figure 4 shows various aberrations at the shortest focal length state, longest focal length state, and intermediate focal length state.The various aberrations are very well balanced. It can be seen that distortion aberration in particular has become extremely small. The specifications of this example are as follows. FIG. 2 shows the shortest focal length state of the lens configuration.
実施例2においては、前群である発散レンズ群中の第1
の正レンズのアツベ数を大とすることにより、特に、最
短焦点距離側での高次の色収差を補正し、また発散群全
体としての色消しを第2の負レンズを貼り合せ成分とす
ることによつて達成している。また、貼り合わせレンズ
を構成している正、負両レンズの屈折率に差をつけるこ
とにより、ペツツバール和を正にもたらし、像面湾曲の
適正なバランスをとつている。後群である収斂レンズ群
中の第3の負レンズ成分は、正レンズと負レンズの貼り
合わせ成分とし、その正レンズの屈折率をNplアツベ
数をνP1負レンズのそれらをそれぞれNN,ν、とす
るときとすることによつて長焦点距離側での球面収差の
色変化を良好に補正でき、長焦点距離側での性能向上に
寄与している。In Example 2, the first lens in the diverging lens group, which is the front group,
By increasing the Atsube number of the positive lens, high-order chromatic aberrations, especially on the shortest focal length side, can be corrected, and the achromatization of the entire diverging group can be achieved by using the second negative lens as a bonding component. This has been achieved by Furthermore, by creating a difference in the refractive index of both the positive and negative lenses that make up the laminated lens, the Petzval sum is made positive and the curvature of field is appropriately balanced. The third negative lens component in the convergent lens group, which is the rear group, is a composite component of a positive lens and a negative lens, and the refractive index of the positive lens is Npl, the Abbe number is νP1, and those of the negative lens are NN, ν, respectively. By doing so, it is possible to satisfactorily correct the color change due to spherical aberration on the long focal length side, contributing to improved performance on the long focal length side.
本実施例によるレンズ系の諸元を次に示し、その各焦点
距離状態での諸収差を第5図に示す。尚、各諸元表中、
rは各レンズ面の曲率半径、dは各レンズの中心厚及び
空気間隔、nは各レンズの屈折率、νは各レンズのアツ
ベ数を表わし、添数字はそれぞれの物体側からの順序を
表わすものとする。The specifications of the lens system according to this example are shown below, and the various aberrations at each focal length state are shown in FIG. In addition, in each specification table,
r is the radius of curvature of each lens surface, d is the center thickness and air gap of each lens, n is the refractive index of each lens, ν is the Atsube number of each lens, and the subscript number represents the order from the object side. shall be taken as a thing.
また、収差図において、球面収差図中の実線は球面収差
を、点線は正弦条件違反量を表わすものとする。第3図
にレンズ構成の最短焦点距離状態が示されている。Further, in the aberration diagram, the solid line in the spherical aberration diagram represents spherical aberration, and the dotted line represents the amount of violation of the sine condition. FIG. 3 shows the shortest focal length state of the lens configuration.
実施例3は、実施例2におけるレンズ系に対してさらに
後群である収斂レンズ群の第2の正レンズを貼り合わせ
成分としたものである。これにより軸上の色収差を容易
に補正でき、また、球面収差の色変化も補正できるので
、他の成分の収差補正負担を軽減することができ、さら
に性能の向上したものを実現することがてきた。本実施
例によるレンズ系の諸元を次に示し、その各焦点距離状
態における諸収差を第6図に示す。In Example 3, the second positive lens of the convergent lens group, which is the rear group, is added as a bonded component to the lens system in Example 2. This makes it possible to easily correct axial chromatic aberration and also correct color changes due to spherical aberration, reducing the burden of correcting aberrations for other components and making it possible to achieve even better performance. Ta. The specifications of the lens system according to this example are shown below, and the various aberrations in each focal length state are shown in FIG.
第1図から第3図まではそれぞれ実施例1から、実施例
3におけるレンズ系の最短焦点距離の状態でのレンズ構
成図、第4図から、第6図までは、それぞれ、実施例1
から実施例3におけるレンズ系の各焦点距離状態に於け
る収差図である。1 to 3 are lens configuration diagrams in the state of the shortest focal length of the lens system in Example 1 and Example 3, respectively, and FIGS. 4 to 6 are lens configuration diagrams of Example 1 and 3, respectively.
FIG. 6 is an aberration diagram at each focal length state of the lens system in Example 3.
Claims (1)
群の後群との2群によつて構成され、該両群を機械的に
移動させることによつて変倍するズームレンズにおおい
て、前記発散群は物体側から順次、第1の正レンズ、像
側に凹面を向けた第1の負メニスカスレンズ、同じく像
側に凹面を向けた第2の負メニスカスレンズ、物体側に
凸な第1の正メニスカスレンズの互いに分離した4成分
より構成され、前記収斂群は物体側から順次第2の正レ
ンズ、物体側に凸な第2の正メニスカスレンズ、物体側
に凸な第3の正メニスカスレンズ、両凹負レンズ、像側
に凸な第4の正メニスカスレンズ、第3の正レンズの互
いに分離した6成分より構成され、前記発散群中の第1
及び第2の負メニスカスレンズの像側の面の曲率半径を
物体側から順にr_4、r_6とするとき|r_4|<
|r_6| の条件を満足することを特徴とする広角ズームレンズ系
。[Claims] 1. Consists of two groups in order from the object side: a front group of diverging lens groups and a rear group of convergent lens groups, and magnification can be changed by mechanically moving both groups. In the zoom lens, the diverging group includes, in order from the object side, a first positive lens, a first negative meniscus lens with a concave surface facing the image side, and a second negative meniscus lens also with a concave surface facing the image side. , a first positive meniscus lens convex toward the object side, four components separated from each other, and the convergent group consists of, in order from the object side, a second positive meniscus lens, a second positive meniscus lens convex toward the object side, and a second positive meniscus lens convex toward the object side. It is composed of six components separated from each other: a third positive meniscus lens convex to the side, a biconcave negative lens, a fourth positive meniscus lens convex to the image side, and a third positive lens.
And when the radius of curvature of the image side surface of the second negative meniscus lens is r_4 and r_6 in order from the object side, |r_4|<
A wide-angle zoom lens system characterized by satisfying the following conditions: |r_6|
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58005649A JPS6049885B2 (en) | 1983-01-17 | 1983-01-17 | Wide-angle zoom lens system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58005649A JPS6049885B2 (en) | 1983-01-17 | 1983-01-17 | Wide-angle zoom lens system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS58130313A JPS58130313A (en) | 1983-08-03 |
JPS6049885B2 true JPS6049885B2 (en) | 1985-11-05 |
Family
ID=11616971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58005649A Expired JPS6049885B2 (en) | 1983-01-17 | 1983-01-17 | Wide-angle zoom lens system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6049885B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5403315B2 (en) * | 2008-08-13 | 2014-01-29 | 株式会社ニコン | Zoom lens system and optical apparatus provided with the zoom lens system |
-
1983
- 1983-01-17 JP JP58005649A patent/JPS6049885B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS58130313A (en) | 1983-08-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPH0431565B2 (en) | ||
JPH0512684B2 (en) | ||
JPH0320734B2 (en) | ||
JPS5811607B2 (en) | Zoom lens with small distortion | |
JPH0359406B2 (en) | ||
JPS6154202B2 (en) | ||
JPS6140969B2 (en) | ||
US4447135A (en) | Zoom lens system | |
JPS6119967B2 (en) | ||
JPS6134125B2 (en) | ||
JPS5918917A (en) | Wide angle zoom lens with wide variable power | |
US4163603A (en) | Wide-angle photograhic objective | |
JPS6149646B2 (en) | ||
JPS592002B2 (en) | Koukakuzu-Murrenskei | |
JPS6119013B2 (en) | ||
JPS6049885B2 (en) | Wide-angle zoom lens system | |
JPS6126044B2 (en) | ||
JPH0574806B2 (en) | ||
JPH0315167B2 (en) | ||
JPS6146809B2 (en) | ||
JPS5832682B2 (en) | Koukakuzu-Murrenskei | |
JPS6190120A (en) | Zoom lens | |
JPS6126047B2 (en) | ||
JPS636848B2 (en) | ||
JPH0239764B2 (en) |