JPH0593865A - Small-sized zoom lens - Google Patents
Small-sized zoom lensInfo
- Publication number
- JPH0593865A JPH0593865A JP3105183A JP10518391A JPH0593865A JP H0593865 A JPH0593865 A JP H0593865A JP 3105183 A JP3105183 A JP 3105183A JP 10518391 A JP10518391 A JP 10518391A JP H0593865 A JPH0593865 A JP H0593865A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- group
- negative
- zoom
- 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.)
- Withdrawn
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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
-
- 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
- G02B15/143—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 three groups only
- G02B15/1435—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 three groups only the first group being negative
- G02B15/143503—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 three groups only the first group being negative arranged -+-
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はレンズシャッターカメラ
等に用いられる小型のズームレンズ、特にその変倍域に
広角を含む高変倍のものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact zoom lens used in a lens shutter camera or the like, and more particularly to a high zoom lens having a wide angle in its zoom range.
【０００２】[0002]
【従来の技術】従来、レンズシャッターカメラ用のズー
ムレンズとしては、変倍比が２倍程度のものでは、物体
側から順に正の屈折力を有する前群と負の屈折力を有す
る後群を配した２群ズーム方式が一般的である（例えば
特開昭５６−１２８９１１号公報参照）。この方式の特
徴は、全系で望遠型の構成となり、バックフォーカス及
びレンズ全長が短いということである。2. Description of the Related Art Conventionally, as a zoom lens for a lens shutter camera, a zoom lens having a zoom ratio of about 2 includes a front group having a positive refractive power and a rear group having a negative refractive power in order from the object side. A two-group zoom system is generally used (for example, see JP-A-56-128911). The feature of this system is that the entire system has a telephoto configuration, and the back focus and the total lens length are short.
【０００３】一方、近年のレンズシャッターカメラの動
向として、高変倍比と広角化の２つの方向が見られる。
このうち、高変倍ズームレンズとしては、正レンズ群先
行の３群ズーム方式（例えば特開昭６３−１５３５１１
号公報参照）や４群ズーム方式のもの（例えば特開昭６
３−４３１１５号公報参照）が数多く提案されている。
また変倍比が２程度の広角ズームレンズとしては正レン
ズ群先行の２群ズーム方式を用いた特開平２−２８４１
０９号公報が公知である。On the other hand, recent trends in lens shutter cameras include two directions: high zoom ratio and wide angle.
Among these, as the high variable power zoom lens, a three-group zoom system preceding the positive lens group (for example, Japanese Patent Laid-Open No. 63-153511).
(See Japanese Patent Publication No. 6) and a four-group zoom system (for example, Japanese Laid-Open Patent Publication No.
Japanese Patent Laid-Open No. 3-43115) has been proposed.
Further, as a wide-angle zoom lens having a zoom ratio of about 2, a two-group zoom system preceded by a positive lens group is used.
No. 09 is known.
【０００４】これらのレンズタイプで高変倍化と広角化
を同時に達成しようとすると、２群ズーム方式はもちろ
ん、３群ズーム方式を用いたとしても、広角端において
周辺光量とバックフォーカスを確保することが困難にな
る、という問題が出てくる。また４群ズーム方式は、部
品点数の増大と製作の困難さを伴うことが多く、特別な
場合を除いて小型のカメラには不向きである。When it is attempted to achieve a high zoom ratio and a wide angle with these lens types at the same time, the peripheral light quantity and the back focus are secured at the wide angle end even if the third group zoom system as well as the second group zoom system is used. The problem arises that it becomes difficult. Further, the four-group zoom method is often not suitable for a small camera except for special cases, since it often involves an increase in the number of parts and is difficult to manufacture.
【０００５】これに対し、３群ズーム方式を用いながら
上記の困難を解決し、高変倍化と広角化を達成したもの
として、特開平２−２３８４１７号公報や特開平２−３
７３１７号公報に記載されたズームレンズが公知であ
る。これらは、ズームレンズを物体側から順に負・正・
負の３つのレンズ群により構成したものである。しか
し、これらの場合でも、絞りから遠いため、或は像面に
近いために径が大きくなる第１レンズ群や第３レンズ群
に複数のレンズを用いているため、コストの上昇が避け
られない、という問題があった。On the other hand, it is known that the above-mentioned difficulties are solved and a high zoom ratio and a wide angle are achieved while using the three-group zoom system, as disclosed in JP-A-2-238417 and 2-3.
The zoom lens described in Japanese Patent No. 7317 is known. These are zoom lens in order from the object side negative / positive /
It is composed of three negative lens groups. However, even in these cases, since a plurality of lenses are used for the first lens group and the third lens group whose diameters are large because they are far from the diaphragm or close to the image plane, an increase in cost cannot be avoided. , There was a problem.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、高変倍化と
広角化という２つの要求を満たしながら、周辺光量比と
バックフォーカスを確保し、かつ性能良好でコストの上
昇も抑えた、レンズシャッターカメラ等に好適な小型の
ズームレンズを提供することにある。SUMMARY OF THE INVENTION The present invention is a lens that satisfies the two requirements of high zoom ratio and wide angle, secures a peripheral light amount ratio and a back focus, has good performance, and suppresses an increase in cost. It is to provide a small zoom lens suitable for a shutter camera or the like.
【０００７】[0007]
【課題を解決するための手段】上記目的を達するため本
発明においては、物体側から順に、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
レンズ群を有し、少なくとも上記第２、第３レンズ群が
移動し、上記第１−第２レンズ群の間隔及び第２−第３
レンズ群の間隔を変化させることにより変倍を行うズー
ムレンズにおいて、上記第１レンズ群、第３レンズ群の
何れか一方を１枚の負レンズにより構成する。また、該
ズームレンズは、以下の条件を満足することが望まし
い。第１レンズ群を１枚の負レンズで構成した場合は ２．０＜△Ｄ23／△Ｄ12＜１５．０ ・・・ 第３レンズ群を１枚の負レンズで構成した場合は ４．０＜△Ｄ12／△Ｄ23＜ １５．０ ・・・ ただし、△Ｄ12、△Ｄ23はそれぞれ第１−２レンズ群間
隔、第２−３レンズ群間隔の広角端と望遠端での変化量
である。In order to achieve the above object, in the present invention, 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 second lens group having a negative refractive power are arranged in order. Three
A lens group, at least the second and third lens groups move, and the distance between the first and second lens groups and the second and third lens groups.
In the zoom lens that performs zooming by changing the distance between the lens groups, one of the first lens group and the third lens group is composed of one negative lens. Further, it is desirable that the zoom lens satisfies the following conditions. When the first lens group is composed of one negative lens, 2.0 <ΔD 23 / ΔD 12 <15.0 ... When the third lens group is composed of one negative lens. 0 <ΔD 12 / ΔD 23 <15.0 ... where ΔD 12 and ΔD 23 are respectively at the wide-angle end and the telephoto end of the first-second lens group interval and the second-third lens group interval. The amount of change.
【０００８】さらに本発明においては、全レンズ系の小
型化のために次の条件を満足することが望ましい。第１
レンズ群が１枚の負レンズを構成する場合は、 ０．５０＜｜φ1｜／φw＜１．２ ・・・ ただし、φ1 ：第１レンズ群の屈折力 φw ：全系の広角端での屈折力 第３レンズ群が１枚の負レンズを構成する場合は、 ０．８＜｜φ3｜／φ2＜１．２ ・・・ ただし、φ2、φ3はそれぞれ第２群、第３群の屈折力Further, in the present invention, it is desirable to satisfy the following conditions in order to downsize the entire lens system. First
When the lens group constitutes one negative lens, 0.50 <| φ 1 | / φw <1.2, where φ 1 is the refractive power of the first lens group φ w is the wide-angle end of the entire system when the third lens unit refracting power constituting one negative lens, 0.8 <at | φ 3 | / φ 2 < 1.2 ··· However, phi 2, phi 3 and the second group, respectively , The refractive power of the third group
【０００９】[0009]
【作用】本発明のズームレンズは、第１群を負レンズ群
とすることにより、広角側で開口効率が大きくなり周辺
光量が確保できると共に、レンズ系が極端な望遠型とな
るのを防ぎ、広角端で適度なバックフォーカスを確保す
ることが出来る。また前述のように第１レンズ群は絞り
から遠いため、第３レンズ群は像面に近いため、レンズ
径が大きくなるので、これらのレンズ群を１枚の負レン
ズにより構成することによりコストの上昇が抑えられ
る。In the zoom lens according to the present invention, by making the first lens unit a negative lens unit, the aperture efficiency is increased on the wide angle side and the peripheral light amount can be secured, and the lens system is prevented from becoming an extremely telephoto type lens. A proper back focus can be secured at the wide-angle end. Further, as described above, since the first lens group is far from the stop and the third lens group is close to the image plane, the lens diameter becomes large. Therefore, by configuring these lens groups with one negative lens, the cost can be reduced. The rise is suppressed.
【００１０】本発明のズームレンズにおいて、第１レン
ズ群或は第３レンズ群を１枚の負レンズとしたことによ
る収差補正の困難さは、条件或は条件を満足させる
ことにより解決することができる。第１レンズ群を１枚
の負レンズで構成したときは△Ｄ12を、従来のズームレ
ンズに比べて小さくなるように設定している。△Ｄ12が
大きくなって条件がその下限をこえて小さくなると、
ズーミングによる収差の変動が大きくなり、特に倍率色
収差の補正が困難になる。また、△Ｄ12が小さくなって
条件がその上限をこえると、第３レンズ群の変倍負担
が増加し、移動量も増大するためコンパクト性を保つた
めの機構上の困難が大きくなる。In the zoom lens of the present invention, the difficulty of aberration correction due to the fact that the first lens unit or the third lens unit is one negative lens can be solved by satisfying the condition or the condition. it can. When the first lens unit is composed of one negative lens, ΔD 12 is set to be smaller than that of the conventional zoom lens. If ΔD 12 becomes large and the condition becomes smaller than the lower limit,
Aberration variation due to zooming becomes large, and it becomes difficult to correct lateral chromatic aberration in particular. Further, when ΔD 12 becomes smaller and the condition exceeds the upper limit, the variable magnification load of the third lens group increases and the moving amount also increases, so that mechanical difficulty for maintaining compactness increases.
【００１１】また第３レンズ群を１枚の負レンズで構成
したときは△Ｄ23を従来のズームレンズに比べて小さく
なるように設定している。△Ｄ23が大きくなって条件
がその下限をこえて小さくなると、ズーミングによる収
差の変動が大きくなり、特に球面収差が望遠側で大きく
オーバーになってしまう。また△Ｄ12が大きくなって△
Ｄ12／△Ｄ23が条件の上限をこえると、第１群の径が
大きくなりコンパクト性が失われる。When the third lens group is composed of one negative lens, ΔD 23 is set to be smaller than that of the conventional zoom lens. When ΔD 23 becomes large and the condition becomes smaller than the lower limit, the fluctuation of aberration due to zooming becomes large, and the spherical aberration becomes large particularly on the telephoto side. Also, ΔD 12 becomes larger △
When D 12 / ΔD 23 exceeds the upper limit of the condition, the diameter of the first group becomes large and compactness is lost.
【００１２】条件の下限をこえて｜φ1｜が小さくな
ると、第３群の変倍負担が増加し移動量も増大するた
め、コンパクト性を保つための機構上の困難が大きくな
る。また上限をこえて｜φ1｜が大きくなると、ズーミ
ングによる収差の変動が大きくなるとともに、レンズ系
が逆望遠型に近づきコンパクト性が失われる。If | φ 1 | becomes smaller than the lower limit of the condition, the variable magnification load of the third lens group increases and the moving amount also increases, so that mechanical difficulty for maintaining compactness increases. If | φ 1 | becomes larger than the upper limit, variation of aberrations due to zooming becomes large, and the lens system approaches an inverse telephoto type, and compactness is lost.
【００１３】条件の下限をこえて｜φ3｜が小さくな
ると、全レンズ系は逆望遠型に近くなり、全長が増大す
る。また上限をこえて｜φ3｜が大きくなると、ズーミ
ングによる収差変動が大きくなる。本発明のような構成
のズームレンズでは、フォーカシングは第１群により行
うのが通例であるが、機構上の制約がなければ、第３群
も同時に動かして行うことも可能である。When | φ 3 | becomes smaller than the lower limit of the condition, the entire lens system becomes close to the inverse telephoto type, and the total length increases. If | φ 3 | becomes larger than the upper limit, variation in aberration due to zooming becomes large. In the zoom lens having the structure of the present invention, focusing is usually performed by the first group, but if there is no mechanical limitation, the third group can be moved simultaneously.
【００１４】[0014]
【実施例】以下、本発明の実施例を示す。実施例１、２
は第１レンズ群が１枚の場合を、実施例３、４は第３レ
ンズ群が１枚の場合を示す。表中、ｆは全系の焦点距
離、ＦはＦナンバー、ωは半画角、Ｒは近軸曲率半径、
Ｄは軸上面間隔、Ｎはｄ線に対する屈折率、νはアッベ
数である。また＊印は非球面を表わし、その形状は面の
頂点を原点として、光軸方向をＸ軸とした直交座標系に
おいて、頂点曲率をｃ、円錐係数をＫ、非球面係数をＡ
ｉ（ｉ＝４，６）として下記の数式１で表わされる。EXAMPLES Examples of the present invention will be shown below. Examples 1, 2
Shows the case where the first lens group is one, and Examples 3 and 4 show the case where the third lens group is one. In the table, f is the focal length of the entire system, F is the F number, ω is the half angle of view, R is the paraxial radius of curvature,
D is the axial upper surface distance, N is the refractive index for the d-line, and ν is the Abbe number. The symbol * indicates an aspherical surface, and its shape is an orthogonal coordinate system with the vertex of the surface as the origin and the optical axis direction as the X-axis. The vertex curvature is c, the conic coefficient is K, and the aspherical coefficient is A.
i (i = 4, 6) is represented by the following mathematical formula 1.
【００１５】[0015]
【数１】 [Equation 1]
【００１６】実施例１ ｆ＝25.79〜58.87 Ｆ3.6〜8.0 ２ω＝80.6°〜40.6° 面番号 R D N ν 1 128.214 1.00 1.71300 53.9 2＊ 16.864 A 3 15.277 4.30 1.72342 38.0 4 247.638 2.00 5 -17.237 1.00 1.77250 49.6 6 -648.166 0.40 7＊ 24.510 3.00 1.58913 61.2 8 -26.113 0.20 9 56.070 0.70 1.84666 23.8 10 13.666 0.68 11 17.960 3.00 1.54072 48.9 12 -15.064 B 13 -38.463 4.10 1.58144 40.7 14 -13.848 1.18 15 -15.428 0.80 1.60311 60.7 16 -82.494 4.50 17 -13.026 1.00 1.69680 55.5 18 -41.824 ｆ Ａ Ｂ ２５．７９ ７．５０ １１．６５ ３９．０２ ６．５０ ６．２０ ５８．８７ ５．５０ ２．７１ 非球面係数 第２面 第７面 Ｋ ＝ ０．３２８８９ Ｋ ＝−１１．０９１ Ａ4 ＝Ａ6 ＝０ Ａ4 ＝−０．５０７９２×１０-5 Ａ6 ＝−０．５７０３２×１０-6 △Ｄ23／△Ｄ12＝４．３０ ｜φ1｜／φw＝０．９５Example 1 f = 25.79 to 58.87 F3.6 to 8.0 2ω = 80.6 ° to 40.6 ° Surface number RDN ν 1 128.214 1.00 1.71300 53.9 2 * 16.864 A 3 15.277 4.30 1.72342 38.0 4 247.638 2.00 5 -17.237 1.00 1.77250 49.6 6 -648.166 0.40 7 * 24.510 3.00 1.58913 61.2 8 -26.113 0.20 9 56.070 0.70 1.84666 23.8 10 13.666 0.68 11 17.960 3.00 1.54072 48.9 12 -15.064 B 13 -38.463 4.10 1.58144 40.7 14 -13.848 1.18 15 -15.428 0.80 1.60311 60.7 16 -82.494 4.50 17 -13.026 1.00 1.69680 55.5 18 -41.824 f A B 25.79 7.50 11.65 39.02 6.50 6.20 58.87 5.50 2.71 Aspherical coefficient 2nd surface 7th surface K = 0.32889 K = -11.091 A 4 = A 6 = 0 A 4 = -0.50792 × 10 -5 A 6 = -0.57032 × 10 -6 △ D 23 / △ D 12 = 4.30 │φ 1 ｜ /φw=0.95
【００１７】実施例２ ｆ＝25.73〜59.02 Ｆ3.6〜8.0 ２ω＝80.3°〜40.4° 面番号 R D N ν 1 24.921 1.00 1.71300 53.9 2＊ 12.113 A 3 21.204 3.00 1.70154 41.2 4 -32.971 1.10 5 -18.741 1.00 1.77250 49.6 6 91.794 2.80 7 44.982 2.60 1.62299 58.2 8＊ -21.788 0.20 9 80.449 0.70 1.84666 23.8 10 15.999 0.68 11 20.328 3.00 1.53172 48.9 12 -14.707 B 13 -25.730 3.80 1.58144 40.7 14 -13.296 2.01 15 -15.123 0.80 1.60311 60.7 16 -70.523 4.30 17 -12.950 1.00 1.69680 55.5 18 -39.539 ｆ Ａ Ｂ ２５．７３ ５．８０ ９．４４ ３９．０２ ５．００ ４．３３ ５９．０２ ４．２０ １．００ 非球面係数 第２面 第８面 Ｋ ＝ ０．５４２２３ Ｋ ＝−１５．９４１ Ａ4 ＝ ０．１７０８５×１０-5 Ａ4 ＝−０．１００２７×１０-4 Ａ6 ＝−０．６１１６８×１０-8 Ａ6 ＝−０．５１７５９×１０-6 △Ｄ23／△Ｄ12＝５．２８ ｜φ1｜／φw＝０．７５Example 2 f = 25.73 to 59.02 F3.6 to 8.0 2ω = 80.3 ° to 40.4 ° Surface number RDN ν 1 24.921 1.00 1.71300 53.9 2 * 12.113 A 3 21.204 3.00 1.70154 41.2 4 -32.971 1.10 5 -18.741 1.00 1.77250 49.6 6 91.794 2.80 7 44.982 2.60 1.62299 58.2 8 * -21.788 0.20 9 80.449 0.70 1.84666 23.8 10 15.999 0.68 11 20.328 3.00 1.53172 48.9 12 -14.707 B 13 -25.730 3.80 1.58144 40.7 14 -13.296 2.01 15 -15.123 0.80 1.60311 60.7 16 -70.523 4.30 17 -12.950 1.00 1.69 680 55.5 18 -39.539 f A B 25.73 5.80 9.44 39.02 5.00 4.33 59.02 4.20 1.00 Aspheric coefficient 2nd surface 8th surface K = 0.54223 K = -15.941 A 4 = 0.17085 × 10 -5 A 4 = -0.10027 × 10 -4 A 6 = -0.61168 × 10 -8 A 6 = -0.51759 × 10 -6 ΔD 23 / ΔD 12 = 5.28 | φ 1 | /φw=0.75
【００１８】以上２つの実施例においては、いずれも第
１群の負レンズに軸外で負の屈折力が強くなるような非
球面を用いて、広角側のコマ収差及び非点収差を補正し
ている。さらに、いずれも第２群中の正レンズに軸外で
正の屈折力が弱くなるような非球面を用いて、中間画角
から望遠側での非点収差を補正している。また第２実施
例では絞りを第２群中に配することにより第１群の径を
小さくし、一層のコンパクト化及び低コストを図ってい
る。In each of the above two embodiments, an aspherical surface having a strong negative off-axis power is used for the negative lens of the first group to correct coma and astigmatism on the wide angle side. ing. Further, in each case, an aspherical surface having a weak positive refracting power off the axis is used for the positive lens in the second group to correct astigmatism on the telephoto side from the intermediate angle of view. Further, in the second embodiment, the diameter of the first group is reduced by arranging the diaphragm in the second group, and further downsizing and cost reduction are achieved.
【００１９】実施例３ ｆ＝28.74〜78.09 Ｆ4.0〜8.3 ２ω＝75.4°〜30.5° 面番号 R D N ν 1 191.93 1.20 1.77250 49.6 2 23.349 3.00 3 76.082 1.00 1.79952 42.2 4 32.979 2.90 5 27.445 3.50 1.80518 25.4 6 75.826 A 7＊ 17.571 4.47 1.48749 70.2 8 -18.702 1.00 1.80518 25.4 9 -43.934 0.50 10 （絞り） ∞ 11.56 11 -1428.4 3.80 1.70154 41.2 12＊ -35.608 B 13＊ -15.967 1.20 1.71300 53.9 14 -109.77 ｆ Ａ Ｂ ２８．７４ １９．６７ １６．３０ ４８．１０ ７．３８ １４．５３ ７８．０９ ０．５０ １２．９６ 非球面係数 第７面 Ｋ ＝−０．２８９６９ Ａ4 ＝−０．９２７１１×１０-5 Ａ6 ＝ ０．５１８１８×１０-7 第１２面 Ｋ ＝−０．３７６０７ Ａ4 ＝ ０．１７７８１×１０-4 Ａ6 ＝ ０．１２５１７×１０-6 第１３面 Ｋ ＝−０．１７５７７ Ａ4 ＝ ０．１２６１６×１０-5 Ａ6 ＝ ０．３０６８７×１０-7 △Ｄ12／△Ｄ23＝５．７４ ｜φ3｜／φ2＝０．９９Example 3 f = 28.74 to 78.09 F4.0 to 8.3 2ω = 75.4 ° to 30.5 ° Surface number RDN ν 1 191.93 1.20 1.77250 49.6 2 23.349 3.00 3 76.082 1.00 1.79952 42.2 4 32.979 2.90 5 27.445 3.50 1.80518 25.4 6 75.826 A 7 * 17.571 4.47 1.48749 70.2 8 -18.702 1.00 1.80518 25.4 9 -43.934 0.50 10 (Aperture) ∞ 11.56 11 -1428.4 3.80 1.70154 41.2 12 * -35.608 B 13 * -15.967 1.20 1.71300 53.9 14 -109.77 f A B 28.74 19.67 16.30 48.10 7.38 14.53 78.09 0.50 12.96 aspherical coefficients seventh surface K = -0.28969 A 4 = -0.92711 × 10 -5 A 6 = 0.51818 × 10 -7 12th surface K = -0.37607 A 4 = 0.17781 × 10 -4 A 6 = 0.12517 × 10 -6 13th surface K = -0.17577 A 4 = 0. 12616 × 10 −5 A 6 = 0.30687 × 10 −7 ΔD 12 / ΔD 23 = 5. 74 | φ 3 | / φ 2 = 0.99
【００２０】実施例４ ｆ＝28.79〜87.54 Ｆ4.0〜8.8 ２ω＝75.6°〜27.4° 面番号 R D N ν 1 92.541 1.20 1.77250 49.6 2 20.758 3.20 3 64.426 1.00 1.79952 42.2 4 32.040 3.04 5 25.369 3.50 1.80518 25.4 6 53.810 A 7＊ 19.678 3.00 1.51633 64.1 8 146.57 0.30 9 55.140 3.50 1.48749 70.2 10 -22.238 1.00 1.80518 25.4 11 -86.013 0.50 12 (絞り) ∞ 12.10 13 136.82 3.30 1.70154 41.2 14＊ -38.148 B 15＊ -16.391 1.20 1.71300 53.9 16 -225.75 ｆ Ａ Ｂ ２８．７９ ２３．０６ １４．１３ ４９．８２ ８．５６ １３．２０ ８７．５４ ０．５０ １２．０５ 非球面係数 第７面 Ｋ ＝−０．５１５２５ Ａ4 ＝−０．１２２３０×１０-5 Ａ6 ＝ ０．２３６０２×１０-7 第１４面 Ｋ ＝−０．１７５７９ Ａ4 ＝ ０．１６１５１×１０-4 Ａ6 ＝ ０．７９５６２×１０-7 第１５面 Ｋ ＝−０．１３６８８ Ａ4 ＝ ０．５４９２０×１０-5 Ａ6 ＝ ０．３１１３７×１０-7 △Ｄ12／△Ｄ23＝１０．８５ ｜φ3｜／φ2＝１．０６Example 4 f = 28.79 to 87.54 F4.0 to 8.8 2ω = 75.6 ° to 27.4 ° Surface number RDN ν 1 92.541 1.20 1.77250 49.6 2 20.758 3.20 3 64.426 1.00 1.79952 42.2 4 32.040 3.04 5 25.369 3.50 1.80518 25.4 6 53.810 A 7 * 19.678 3.00 1.51633 64.1 8 146.57 0.30 9 55.140 3.50 1.48749 70.2 10 -22.238 1.00 1.80518 25.4 11 -86.013 0.50 12 (aperture) ∞ 12.10 13 136.82 3.30 1.70154 41.2 14 * -38.148 B 15 * -16.391 1.20 1.71300 53.9 16- 225.75 f A B 28.79 23.06 14.13 49.82 8.56 13.20 87.54 0.50 12.05 Aspheric surface coefficient 7th surface K = -0.51525 A 4 = -0.12230 × 10 -5 A 6 = 0.23602 × 10 -7 14th surface K = -0.17579 A 4 = 0.16151 × 10 -4 A 6 = 0.79562 × 10 -7 15th surface K = -0 .13688 A 4 = 0.54920 × 10 -5 A 6 = 0.31137 × 1 -7 △ D 12 / △ D 23 = 10.85 | φ 3 | / φ 2 = 1.06
【００２１】上記２つの実施例では、いずれも第２群中
の正の前群を、さらに絞りを含む正のレンズ群と、その
像側に空気間隔をおいて配置された、非球面を有する正
のレンズ群の２つに分割している。この非球面は、軸外
で曲率が弱くなるようにその形状を選んであり、長焦点
側のコマ収差の補正に有効である。また上記２つの実施
例では、いずれも負の第３レンズ群に軸外で曲率がゆる
くなるような非球面を用いてあり、ズーミングによる収
差変動がより小さくなるようにしている。In each of the above-mentioned two embodiments, the positive front lens group in the second lens group is further provided with a positive lens group including a diaphragm, and an aspherical surface arranged on the image side thereof with an air gap. It is divided into two positive lens groups. The shape of this aspherical surface is selected so that the curvature becomes weak off-axis, and it is effective for correction of coma on the long focus side. Further, in each of the above-mentioned two examples, an aspherical surface whose curvature is off-axis is used for the negative third lens group, so that the variation in aberration due to zooming is further reduced.
【００２２】[0022]
【発明の効果】本発明のズームレンズは、その実施例及
び各収差図に見るように、低コストでコンパクトであり
ながら、半画角が３２°以上の広角を含み、２倍以上、
特に第３、第４実施例では３倍程度の高い変倍比を有し
ており、しかも各収差がバランスよく補正されレンズシ
ャッターカメラ等のコンパクトなカメラに搭載するのに
適したものとなっている。尚、本発明を広角を含まな
い、あるいは低変倍のズームレンズに用いたとしても、
同様の効果が得られることは勿論である。As can be seen from the examples and each aberration diagram, the zoom lens of the present invention is low-cost and compact, and includes a wide angle with a half angle of view of 32 ° or more and a magnification of 2 times or more.
In particular, the third and fourth embodiments have a high zoom ratio of about 3 times, and each aberration is corrected in a well-balanced manner, which is suitable for mounting on a compact camera such as a lens shutter camera. There is. Even if the present invention is used for a zoom lens that does not include a wide angle or has a low zoom ratio,
Of course, the same effect can be obtained.
【図１】本発明のズームレンズの実施例１の断面図FIG. 1 is a sectional view of a zoom lens according to a first embodiment of the present invention.
【図２】本発明のズームレンズの実施例２の断面図FIG. 2 is a sectional view of a zoom lens according to a second embodiment of the present invention.
【図３】本発明のズームレンズの実施例１の広角端の収
差図FIG. 3 is an aberration diagram at the wide-angle end of Embodiment 1 of the zoom lens of the present invention.
【図４】本発明のズームレンズの実施例１の中焦点の収
差図FIG. 4 is an aberration diagram of a middle focus of Example 1 of the zoom lens of the present invention.
【図５】本発明のズームレンズの実施例１の望遠端の収
差図FIG. 5 is an aberration diagram at a telephoto end of Embodiment 1 of the zoom lens according to the present invention.
【図６】本発明のズームレンズの実施例２の広角端の収
差図FIG. 6 is an aberration diagram of a zoom lens according to a second exemplary embodiment of the present invention at the wide-angle end.
【図７】本発明のズームレンズの実施例２の中焦点の収
差図FIG. 7 is an aberration diagram of a middle focus of Example 2 of the zoom lens according to the present invention.
【図８】本発明のズームレンズの実施例２の望遠端の収
差図FIG. 8 is an aberration diagram of a zoom lens according to a second exemplary embodiment of the present invention at a telephoto end.
【図９】本発明のズームレンズの実施例３の断面図FIG. 9 is a sectional view of a zoom lens according to a third embodiment of the present invention.
【図１０】本発明のズームレンズの実施例４の断面図FIG. 10 is a sectional view of a zoom lens according to a fourth embodiment of the present invention.
【図１１】本発明のズームレンズの実施例３の広角端の
収差図FIG. 11 is an aberration diagram at a wide-angle end of Example 3 of the zoom lens according to the present invention.
【図１２】本発明のズームレンズの実施例３の中焦点の
収差図FIG. 12 is an aberration diagram of a middle focus of Embodiment 3 of the zoom lens of the present invention.
【図１３】本発明のズームレンズの実施例３の望遠端の
収差図FIG. 13 is an aberration diagram of Example 3 of the zoom lens according to the present invention at the telephoto end.
【図１４】本発明のズームレンズの実施例４の広角端の
収差図FIG. 14 is an aberration diagram at the wide-angle end of Embodiment 4 of the zoom lens according to the present invention.
【図１５】本発明のズームレンズの実施例４の中焦点の
収差図FIG. 15 is a diagram of aberrations in the middle focus of Example 4 of the zoom lens according to the present invention.
【図１６】本発明のズームレンズの実施例４の望遠端の
収差図16 is an aberration diagram at a telephoto limit of Embodiment 4 of the zoom lens according to the present invention. FIG.
収差図中、「ｄ」、「ｇ」はそれぞれｄ線、ｇ線に対す
る球面収差を、「△Ｓ」、「△Ｍ」はそれぞれサジタル
像面、メリディオナル像面を表わしている。In the aberration diagrams, “d” and “g” represent spherical aberrations with respect to d line and g line, respectively, and “ΔS” and “ΔM” represent sagittal image plane and meridional image plane, respectively.
Claims (5)
ズ群、正の屈折力の第２レンズ群、負の屈折力の第３レ
ンズ群を有し、少なくとも上記第２、第３レンズ群が移
動し、上記第１−第２レンズ群の間隔及び第２−第３レ
ンズ群の間隔を変化させることにより変倍を行うズーム
レンズにおいて、上記第１レンズ群、第３レンズ群の何
れかを１枚の負レンズにより構成したことを特徴とする
小型のズームレンズ1. A first lens unit having a negative refracting power, a second lens unit having a positive refracting power, and a third lens unit having a negative refracting power, which are arranged in order from the object side, and at least the second and third lenses are provided. In a zoom lens that performs zooming by moving the lens groups and changing the distance between the first and second lens groups and the distance between the second and third lens groups, a zoom lens of the first lens group and the third lens group Small zoom lens characterized in that any one of them is composed of one negative lens
成され、 ２．０＜△Ｄ23／△Ｄ12＜１５．０ の条件を満足する請求項１のズームレンズただし、△Ｄ
12、△Ｄ23はそれぞれ第１−２レンズ群間隔、第２−３
レンズ群間隔の広角端と望遠端での変化量である。2. The zoom lens according to claim 1, wherein the first lens unit is composed of one negative lens and satisfies the condition of 2.0 <ΔD 23 / ΔD 12 <15.0.
12 and ΔD 23 are the intervals between the first and second lens groups and the second and third lenses, respectively.
This is the amount of change in the lens group spacing at the wide-angle end and the telephoto end.
成され、 ４．０＜△Ｄ12／△Ｄ23＜１５．０ の条件を満足する請求項１のズームレンズ4. The zoom lens according to claim 1, wherein the third lens group is composed of one negative lens and satisfies the condition of 4.0 <ΔD 12 / ΔD 23 <15.0.
条件を満足する請求項４のズームレンズ5. The zoom lens according to claim 4, wherein 0.8 <| φ 3 | / φ 2 <1.2, where φ 2 and φ 3 satisfy the refractive power conditions of the second and third groups, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3105183A JPH0593865A (en) | 1991-04-11 | 1991-04-11 | Small-sized zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3105183A JPH0593865A (en) | 1991-04-11 | 1991-04-11 | Small-sized zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0593865A true JPH0593865A (en) | 1993-04-16 |
Family
ID=14400566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3105183A Withdrawn JPH0593865A (en) | 1991-04-11 | 1991-04-11 | Small-sized zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0593865A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6353507B1 (en) * | 1998-12-24 | 2002-03-05 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens systems |
| KR100440101B1 (en) * | 2001-08-31 | 2004-07-14 | 삼성테크윈 주식회사 | Wide-angle zoom lens |
| US6885507B2 (en) | 2002-04-19 | 2005-04-26 | Pentax Corporation | Zoom lens system which covers a wide angle range |
| JP2007033555A (en) * | 2005-07-22 | 2007-02-08 | Canon Inc | Zoom lens and imaging apparatus having the same |
| JP2007219113A (en) * | 2006-02-16 | 2007-08-30 | Casio Comput Co Ltd | Zoom lens and camera |
| US7817352B2 (en) | 2006-02-13 | 2010-10-19 | Casio Computer Co., Ltd. | Zoom lens and camera with zoom lens |
-
1991
- 1991-04-11 JP JP3105183A patent/JPH0593865A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6353507B1 (en) * | 1998-12-24 | 2002-03-05 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens systems |
| KR100440101B1 (en) * | 2001-08-31 | 2004-07-14 | 삼성테크윈 주식회사 | Wide-angle zoom lens |
| US6885507B2 (en) | 2002-04-19 | 2005-04-26 | Pentax Corporation | Zoom lens system which covers a wide angle range |
| JP2007033555A (en) * | 2005-07-22 | 2007-02-08 | Canon Inc | Zoom lens and imaging apparatus having the same |
| US7817352B2 (en) | 2006-02-13 | 2010-10-19 | Casio Computer Co., Ltd. | Zoom lens and camera with zoom lens |
| US7940475B2 (en) | 2006-02-13 | 2011-05-10 | Casio Computer Co., Ltd. | Zoom lens and camera with zoom lens |
| JP2007219113A (en) * | 2006-02-16 | 2007-08-30 | Casio Comput Co Ltd | Zoom lens and camera |
| JP4552870B2 (en) * | 2006-02-16 | 2010-09-29 | カシオ計算機株式会社 | Zoom lens and camera |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980711 |