JP2676384B2 - Compact zoom lens - Google Patents
Compact zoom lensInfo
- Publication number
- JP2676384B2 JP2676384B2 JP63222505A JP22250588A JP2676384B2 JP 2676384 B2 JP2676384 B2 JP 2676384B2 JP 63222505 A JP63222505 A JP 63222505A JP 22250588 A JP22250588 A JP 22250588A JP 2676384 B2 JP2676384 B2 JP 2676384B2
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- JP
- Japan
- Prior art keywords
- lens
- lens group
- zoom
- group
- 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.)
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Description
【発明の詳細な説明】 （産業上の利用分野） この発明はコンパクトなズームレンズ、特に、レンズ
シャッターカメラに適した、ズーム比の大きい広角ズー
ムレンズに関する。TECHNICAL FIELD The present invention relates to a compact zoom lens, and more particularly to a wide-angle zoom lens having a large zoom ratio, which is suitable for a lens shutter camera.
（従来技術） 現在レンズシャッターカメラに於てもズームレンズを
搭載する機種が増えており、コンパクト性を維持したま
まで大ズーム比を有するシャッターカメラ用ズームレン
ズの要求が強くなっている。また使用者の要求に応える
ためには、ズーム比を大きくする場合に、長焦点化だけ
ではなく、広角域をカバーすることも必要であると考え
られる。(Prior Art) At present, the number of models equipped with a zoom lens in a lens shutter camera is increasing, and a demand for a zoom lens for a shutter camera having a large zoom ratio while maintaining compactness is increasing. Further, in order to meet the demands of users, it is considered necessary to cover not only a long focal point but also a wide angle range when increasing the zoom ratio.
従来レンズシャッターカメラ用の小型のズームレンズ
として、例えば特開昭56−128911号によって知られるよ
うに、正負の２レンズ群で構成され、これらのレンズ群
の間隔を変化させることによって変倍する２群ズームが
知られている。しかし、このタイプのズームレンズで例
えば３倍程度のズーム比を得ようとすると、第２群にお
ける倍率変化及び軸外光束の通過位置の変化が大きく収
差補正上無理があった。As a small zoom lens for a conventional lens shutter camera, it is composed of two lens groups of positive and negative as known from Japanese Patent Laid-Open No. 56-128911, for example, and zooming is performed by changing the distance between these lens groups. Swarm zoom is known. However, if an attempt is made to obtain a zoom ratio of, for example, about 3 times with this type of zoom lens, the change in magnification and the change in the off-axis light beam passing position in the second lens group are large, and this makes it difficult to correct aberrations.
また特開昭63−43115号に記載された４群構成のズー
ムレンズは、広角端の全長を小としながら３倍近いズー
ム比を得ているが、負の第２レンズ群のパワーが比較的
強いため、60度を超える画角を得ようとすると、負の歪
曲収差が大きくなることが予測される。Further, the zoom lens of the four-group construction described in Japanese Patent Laid-Open No. 63-43115 has a zoom ratio of nearly 3 times while making the overall length at the wide-angle end small, but the power of the second lens group of negative power is relatively small. Since it is strong, it is expected that negative distortion will become large if an angle of view exceeding 60 degrees is attempted.
一方、一眼レフカメラ用のズームレンズでは、例えば
特開昭58−79213号に記載されたレンズは、物体側から
順に負、正、負の３群構成のズームレンズであって、広
角域をカバーし、３倍程度のズーム比を有しているが、
一眼レフカメラ用に必要な長いバックフォーカスを得て
いるため、レンズシャッターカメラ用としてコンパクト
とは言えない。On the other hand, in a zoom lens for a single-lens reflex camera, for example, the lens disclosed in Japanese Patent Laid-Open No. 58-79213 is a zoom lens having a negative, positive, and negative three-group structure in order from the object side, and covers a wide angle range. However, although it has a zoom ratio of about 3 times,
Since it has the long back focus required for single-lens reflex cameras, it cannot be said to be compact for lens shutter cameras.
（この発明が解決しようとする問題点） この発明は、広角端での焦点距離が画面の対角長より
短く、２倍以上のズーム比を有し、良好な結像性能を保
ちながら、レンズシャッターカメラに搭載するに適した
コンパクトなズームレンズを提供しようとするものであ
る。(Problems to be Solved by the Invention) The present invention has a focal length at the wide-angle end that is shorter than the diagonal length of the screen, has a zoom ratio of 2 times or more, and maintains good imaging performance while maintaining good lens performance. The objective is to provide a compact zoom lens suitable for mounting on a shutter camera.
（問題点を解決するための手段） この発明のズームレンズは、物体側から順に、第１レ
ンズ群は負の屈折力を有し、第２レンズ群と第３レンズ
群との合成系は正の屈折力を有し、第４レンズ群は負の
屈折力を有する４群構成のズームレンズであって、第１
レンズ群と第２レンズ群との間隔及び第３レンズ群と第
４レンズ群との間隔および第１レンズ群から第４レンズ
群までの距離が共に、広角端においてより望遠端におい
て小となり、かつ、以下の条件を満たすことを特徴とす
る。(Means for Solving Problems) In the zoom lens according to the present invention, the first lens group has a negative refractive power and the composite system of the second lens group and the third lens group is positive in order from the object side. The fourth lens unit has a negative refracting power and the fourth lens unit has a negative refracting power.
The distance between the lens group and the second lens group, the distance between the third lens group and the fourth lens group, and the distance from the first lens group to the fourth lens group are both smaller at the wide-angle end than at the telephoto end, and , Is characterized by satisfying the following conditions.
1.1＜Z4/（Z2・Z3）＜2.2 …… （１−m4w）f4/fw＜0.60 …… ただし、 Z2＝m2T/m2W Z3＝m3T/m3W Z4＝m4T/m4W m2W:広角端における第２レンズ群の横倍率 m2T:望遠端における第２レンズ群の横倍率 m3W:広角端における第３レンズ群の横倍率 m3T:望遠端における第３レンズ群の横倍率 m4W:広角端における第４レンズ群の横倍率 m4T:望遠端における第４レンズ群の横倍率 f4:第４レンズ群の焦点距離 fW:広角端における全系の焦点距離 また、このズームレンズは、具体的には以下の構成と
することが望ましい。1.1 <Z 4 / (Z 2 · Z 3 ) <2.2 …… (1-m 4w ) f 4 / f w <0.60 …… However, Z 2 ＝ m 2T / m 2W Z 3 ＝ m 3T / m 3W Z 4 = m 4T / m 4W m 2W : Lateral magnification of second lens group at wide-angle end m 2T : Lateral magnification of second lens group at telephoto end m 3W : Lateral magnification of third lens group at wide-angle end m 3T : Telephoto Lateral magnification of the third lens group at the end m 4W : lateral magnification of the fourth lens group at the wide-angle end m 4T : lateral magnification of the fourth lens group at the telephoto end f 4 : focal length of the fourth lens group f W : wide-angle end Further, it is desirable that the zoom lens has the following specific configuration.
第１レンズ群は物体側から順に負レンズ、正レンズの
順に配列されたレンズを含み、第４レンズ群は物体側か
ら正レンズ、負レンズの順に配列されたレンズを含み、
かつ以下の条件を満たす。1N −1P＞５ …… （2P＋3P）/2＜1.7 ……4N −4P＞10 …… ただしiP :第ｉレンズ群中の正レンズのアツベ数の平均値iN :第ｉレンズ群中の負レンズのアツベ数の平均値iP :第ｉレンズ群中の正レンズの屈折率の平均値 更にこの発明のズームレンズは以下の条件を満たすこ
とがより望ましい。The first lens group includes lenses arranged in order of a negative lens and a positive lens from the object side, and the fourth lens group includes lenses arranged in order of a positive lens and a negative lens from the object side,
And the following conditions are met. 1N - 1P> 5 ...... (2P + 3P) / 2 <1.7 ...... 4N - 4P> 10 ...... However iP: Mean value of Abbe's number of the i-th lens positive lens in group iN: in the i-th lens group Average value of the Abbe number of the negative lens iP : average value of the refractive index of the positive lens in the i-th lens group Further, it is more preferable that the zoom lens according to the present invention satisfies the following condition.
0.6＜ra/fW＜1.2 …… −4.1＜（rc＋rb）／（rc−rb）＜−1.2 …… ただし ra:第１レンズ群中の最も像側の正レンズの物体側面の
曲率半径 rb,rc:第４レンズ群中の最も物体側の正レンズのそれぞ
れ物体側面、像側面の曲率半径 である。0.6 <r a / f W <1.2 …… −4.1 <(r c + r b ) / (r c −r b ) <− 1.2 ……, where r a : of the positive lens closest to the image side in the first lens group Curvature radii of object side surface r b , r c : Curvature radii of the object side surface and the image side surface of the positive lens closest to the object side in the fourth lens group, respectively.
（作用） 以下にこの発明のズームレンズの基本的な構成及び各
条件式の意味を説明する。(Operation) The basic structure of the zoom lens according to the present invention and the meaning of each conditional expression will be described below.
まずこの発明のズームレンズは両端に配される第１レ
ンズ群と第４レンズ群が共に負の屈折力を有し、かつ第
１レンズ群と第２レンズ群との間隔及び第３レンズ群と
第４レンズ群との間隔が共に、広角端に於てより望遠端
に於て小となるため、ズーミングに際してパワー配置の
対称性が良く維持される。この対称性により歪曲収差を
はじめとする軸外収差が補正し易くなっている。また、
第１レンズ群が負の屈折力を有するため、これが正屈折
力であるタイプに比べ前玉径を小さくできることとあい
まって、コンパクトな構成を有しながら広角化しやすい
特質を備えている。First, in the zoom lens of the present invention, the first lens group and the fourth lens group, which are arranged at both ends, both have negative refracting power, and the distance between the first lens group and the second lens group and the third lens group are Since the distance between the fourth lens group and the fourth lens group becomes smaller at the wide-angle end and at the telephoto end, the symmetry of the power arrangement is maintained well during zooming. This symmetry makes it easy to correct off-axis aberrations such as distortion. Also,
Since the first lens group has a negative refracting power, the diameter of the front lens can be made smaller than that of the type having a positive refracting power, and the first lens group has a characteristic that it is easy to widen the angle while having a compact structure.
次にこの発明のズームレンズの広角端から望遠端への
各レンズ群の移動において、第２レンズ群と第３レンズ
群の少なくとも一方と第４レンズ群とが増倍作用を分担
するため、２群ズームでは得がたい大きな変倍比を得る
ことができる。また第２レンズ群と第３レンズ群との間
隔の変化により、ズーミングにおける収差変動を補正す
る自由度を得ている。Next, in the movement of each lens unit from the wide-angle end to the telephoto end of the zoom lens according to the present invention, at least one of the second lens unit and the third lens unit and the fourth lens unit share the multiplication action, It is possible to obtain a large zoom ratio that is difficult to obtain with the group zoom. Further, the change in the distance between the second lens group and the third lens group provides the degree of freedom for correcting aberration fluctuations during zooming.
条件式は各レンズ群の変倍作用をバランス良く分担
させる条件であって、短いレンズ全長と大ズーム比を両
立させるものである。例えば従来の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レンズ群からなる一眼レフカメラ用のズ
ームレンズでは、長いバックフォーカスを得るために変
倍作用は主として第２レンズ群が受け持っているが、こ
の発明のズームレンズではレンズシャッターカメラ用と
してバックフォーカスが短くても良いという条件のもと
に、広角端のバックフォーカスを短くし、第４レンズ群
に比較的強い負の屈折力を与え、大きな倍作用を分担さ
せて、全長の短縮を図っている。条件式の下限を外れ
るとレンズ全長が長くなりコンパクト性を損なう。逆に
上限を外れると第４レンズ群の負担が大きく、大きなズ
ーム比を得ることが困難になる。The conditional expression is a condition in which the zooming action of each lens group is shared in a well-balanced manner, and is one that achieves both a short overall lens length and a large zoom ratio. For example, in a conventional zoom lens for a single-lens reflex camera including a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power in order from the object side, a long back focus is used. The second lens group mainly takes charge of the zooming effect to obtain the zoom lens. However, in the zoom lens of the present invention, the back focus at the wide-angle end is provided under the condition that the back focus may be short for a lens shutter camera. By shortening the length, a relatively strong negative refracting power is given to the fourth lens group, and a large doubling action is shared to shorten the total length. If the lower limit of the conditional expression is not satisfied, the total lens length becomes long and the compactness is impaired. On the contrary, if the upper limit is exceeded, the load on the fourth lens group will be heavy and it will be difficult to obtain a large zoom ratio.
条件式も条件式と同様に、広角端のバックフォー
カスに短い値を与えて全長の短縮を図る条件であって、
この条件を外れるとレンズ全長が長くなる。m4W,f4それ
ぞれの望ましい値は次の範囲である。Similar to the conditional expression, the conditional expression is a condition for giving a short value to the back focus at the wide-angle end to shorten the total length,
If this condition is not satisfied, the total lens length will become longer. Desirable values for m 4W and f 4 are in the following ranges.
1.05＜m4W＜1.3 ……′ −2.0＜f4/fW＜−1.2 ……″ 条件式′の上限及び″の下限は上述の全長の短縮
を図るものである。′の下限は広角端に於て正の値の
バックフォーカスを確保するためのものであり、″の
上限は第４群で発生する収差のズーミングによる変動を
抑えるためのものである。1.05 <lower limit of the '' upper and m 4W <1.3 ...... condition "-2.0 <f 4 / f W <-1.2 ...... ' is intended to shorten the overall length of the above. The lower limit of ′ is for ensuring a positive back focus at the wide-angle end, and the upper limit of ″ is for suppressing fluctuations of the aberration occurring in the fourth lens unit due to zooming.
条件式及び条件式は色収差の補正に関する。負の
屈折力を有する第１レンズ群、第４レンズ群においては
正レンズの分散が負レンズの分散より大きいことが必要
である。条件式及び条件式はその望ましい程度を示
すものであって、これらの条件を外れると軸上色収差と
倍率色収差の両方を全ズーム域で小さな値に維持するこ
とがむずかしい。The conditional expression and the conditional expression relate to correction of chromatic aberration. In the first lens group and the fourth lens group having negative refractive power, it is necessary that the dispersion of the positive lens is larger than the dispersion of the negative lens. The conditional expressions and the conditional expressions show the desired degree, and if these conditions are not satisfied, it is difficult to maintain both the axial chromatic aberration and the lateral chromatic aberration at small values in the entire zoom range.
条件式はペッツバール和の補正に関する。この発明
のズームレンズでは全長を抑えながら大ズーム比を得よ
うとするとペッツバール和が負となりがちであるが、条
件式により第２レンズ群中、及び第３レンズ群中の正
レンズには屈折率の小さな硝材を用いて全系のペッツバ
ール和を正の値もしくはほとんど０に等しい負の値とす
ることができる。この条件を外れるとペッツバール和が
負で大となり良好な像面を得ることがむずかしい。The conditional expression relates to the correction of Petzval sum. In the zoom lens of the present invention, when trying to obtain a large zoom ratio while suppressing the total length, the Petzval sum tends to be negative. However, depending on the conditional expression, the positive lens in the second lens group and the positive lens in the third lens group have a refractive index. It is possible to make the Petzval sum of the entire system a positive value or a negative value almost equal to 0 using a small glass material of. If this condition is not satisfied, the Petzval sum will be negative and large, and it will be difficult to obtain a good image surface.
条件式は良好な球面収差を得るためのものである。
この発明のズームレンズでは、軸上光線が望遠側で、負
の屈折力を有する第１群の高い位置を通るため球面収差
が望遠側でオーバーになりやすい。条件式は、第１群
の中でもとくに球面収差のズーミングによる変化に影響
の大きい最も像側の正レンズの物体側面で適当な球面収
差を発生させ、良好な球面収差を得るためのものであ
る。この下限を外れると望遠側で球面収差が大きくアン
ダーになる。逆に上限を外れると望遠側で球面収差が大
きくアンダーになる。逆に上限を外れると望遠側で球面
収差が大きくオーバーになる。The conditional expression is for obtaining good spherical aberration.
In the zoom lens according to the present invention, since the axial ray travels on the telephoto side and passes through the high position of the first lens unit having a negative refractive power, spherical aberration tends to be excessive on the telephoto side. The conditional expression is for generating an appropriate spherical aberration on the object side surface of the positive lens closest to the image side, which has a great influence on the change of the spherical aberration due to zooming in the first group, and obtains a good spherical aberration. If this lower limit is not reached, spherical aberration will be significantly under-exposed on the telephoto side. On the other hand, if the upper limit is exceeded, spherical aberration will become large under the telephoto end. On the contrary, if the upper limit is exceeded, the spherical aberration on the telephoto side becomes large and becomes excessive.
条件式は第４レンズ群中の最も物体側の正レンズに
関し、その形状因子の望ましい範囲を定めている。この
下限を外れてメニスカスの度合が強くなると、このレン
ズを通る軸外光束の外側部分に対して大きな内向性のコ
マフレアーを生じてしまう。この上限を外れてメニスカ
スの度合が弱くなると望遠側で球面収差が大きくオーバ
ーになってしまう。The conditional expression defines a desirable range of the shape factor of the positive lens closest to the object in the fourth lens group. If the lower limit is not reached and the degree of meniscus is increased, a large inward coma flare is generated with respect to the outer portion of the off-axis light flux passing through this lens. When the upper limit is exceeded and the degree of meniscus is weakened, spherical aberration is greatly exceeded on the telephoto side.
なおこの発明のズームレンズでは第１レンズ群の繰出
しによってフォーカシングを行なえるが、あるいは第１
レンズ群より像側の適宜のレンズ群の移動もしくは、適
宜なレンズ群の一部分の移動によってもフォーカシング
を行なえることはもちろんである。In the zoom lens according to the present invention, focusing can be performed by extending the first lens group.
It goes without saying that focusing can also be performed by moving an appropriate lens unit on the image side of the lens unit or moving an appropriate part of the lens unit.
また、各レンズ群の移動経路に関しては、広角端から
望遠端へのズーミングに際し第２レンズ群、第３レンズ
群、第４レンズ群は単調に物体側に移動するが第１レン
ズ群は単調移動であっても往復移動であっても良い。と
くに第１レンズ群が単調移動する場合は、４つのレンズ
群が同じ方向に単調移動するためズームカム溝を緩やか
にできる。このためパワーズームの場合にモーターのト
ルクが小さくて良いというメリットがある。Regarding the movement path of each lens group, the second lens group, the third lens group, and the fourth lens group move monotonically to the object side during zooming from the wide-angle end to the telephoto end, but the first lens group monotonically moves. Alternatively, it may be a reciprocating movement. Particularly when the first lens group moves monotonically, the four lens groups move monotonically in the same direction, so that the zoom cam groove can be loosened. Therefore, in the case of power zoom, there is an advantage that the motor torque can be small.
（実施例） 以下に、この発明の実施例を示す。表中の記号は以下
のものを示す。(Example) Below, the Example of this invention is shown. The symbols in the table indicate the following.
f:全系の合成焦点距離 F:開放Ｆ値 ω：半画角 r:屈折面の曲率半径 d:屈折面間隔 nd:レンズ材料の屈折率 νd:レンズ材料のアッベ数 fB:バックフォーカス 第１実施例 ｆ＝36.0〜102.9 Ｆ＝2.9〜6.8 ２ω＝61.8゜〜23.6゜ ｆ 36.00 60.97 102.88 d6 19.00 8.20 1.00 d10 4.90 4.38 3.60 d16 23.84 10.52 1.50 fB 7.86 37.06 83.50 Z4/（Z2・Z3）＝1.53 （１−m4w）f4/fw＝1.601N −1P＝21.5 （2P＋3P）/2＝1.624N −4P＝14.2 第２実施例 ｆ＝28.8〜102.8 Ｆ＝2.8〜7.6 ２ω＝75.8゜〜23.6゜ ｆ 28.81 54.41 102.85 d6 22.50 5.04 1.00 d10 0.50 2.33 1.70 d16 15.53 11.99 1.00 fB 6.27 24.07 76.33 Z4/（Z2・Z3）＝1.41 （１−m4w）f4/fw＝0.251N −1P＝24.2 （2P＋3P）/2＝1.644N −4P＝24.4 （発明の効果） この発明は、各実施例及びその収差図に見るようにコ
ンパクトで簡単な構成でありながら、広角もしくは準広
角を含む大ズーム比を実現し、収差も良好に補正されて
おり、レンズシャッターカメラ用として好適である。f: Synthetic focal length of the whole system F: Open F value ω: Half angle of view r: Curvature radius of refractive surface d: Refractive surface interval n d : Refractive index of lens material ν d : Abbe number of lens material f B : Back Focus First Embodiment f = 36.0 to 102.9 F = 2.9 to 6.8 2ω = 61.8 ° to 23.6 ° f 36.00 60.97 102.88 d 6 19.00 8.20 1.00 d 10 4.90 4.38 3.60 d 16 23.84 10.52 1.50 f B 7.86 37.06 83.50 Z 4 / (Z 2・ Z 3 ) = 1.53 (1-m 4w ) f 4 / f w = 1.60 1N - 1P = 21.5 (2P + 3P ) /2=1.62 4N - 4P = 14.2 second embodiment f = 28.8~102.8 F = 2.8~7.6 2ω = 75.8 ° ～23.6 ° f 28.81 54.41 102.85 d 6 22.50 5.04 1.00 d 10 0.50 2.33 1.70 d 16 15.53 11.99 1.00 f B 6.27 24.07 76.33 Z 4 / (Z 2 · Z 3 ) = 1.41 (1-m 4w ) f 4 / f w = 0.25 1N - 1P = 24.2 (2P + 3P ) /2=1.64 4N - 4P = 24.4 ( effect of the invention) the present invention, is compact with a simple structure as seen in the embodiments and the aberration diagrams, the wide-angle or quasi A large zoom ratio including a wide angle is realized, and aberrations are well corrected, which is suitable for a lens shutter camera.
第１図、第３図はそれぞれ第１実施例、第２実施例のレ
ンズ断面図、第２図、第４図はそれぞれ第１実施例、第
２実施例の収差図である。1 and 3 are lens cross-sectional views of the first and second examples, respectively, and FIGS. 2 and 4 are aberration diagrams of the first and second examples, respectively.
Claims (2)
力を有し、第２レンズ群と第３レンズ群との合成系は正
の屈折力を有し、第４レンズ群は負の屈折力を有する４
群構成のズームレンズであって、 第１レンズ群と第２レンズ群との間隔、第３レンズ群と
第４レンズ群との間隔および第１レンズ群から第４レン
ズ群までの距離が共に、広角端においてより望遠端にお
いて小となり、 かつ、以下の条件を満たすことを特徴とするズームレン
ズ 1.1＜Z4/（Z2・Z3）＜2.2 （１−m4w）f4/fw＜0.60 ただし Z2＝m2T/m2W Z3＝m3T/m3W Z4＝m4T/m4W m2W:広角端における第２レンズ群の横倍率 m2T:望遠端における第２レンズ群の横倍率 m3W:広角端における第３レンズ群の横倍率 m3T:望遠端における第３レンズ群の横倍率 m4W:広角端における第４レンズ群の横倍率 m4T:望遠端における第４レンズ群の横倍率 f4:第４レンズ群の焦点距離 fw:広角端における全系の焦点距離1. The first lens group has a negative refractive power, the composite system of the second lens group and the third lens group has a positive refractive power, and the fourth lens group has a negative refractive power in order from the object side. 4 with negative refractive power
A zoom lens having a group configuration, wherein the distance between the first lens group and the second lens group, the distance between the third lens group and the fourth lens group, and the distance from the first lens group to the fourth lens group are both Zoom lens 1.1 <Z 4 / (Z 2 · Z 3 ) <2.2 (1-m 4w ) f 4 / f w <, which is smaller at the wide-angle end than at the telephoto end and satisfies the following conditions: 0.60 However, Z 2 ＝ m 2T / m 2W Z 3 ＝ m 3T / m 3W Z 4 ＝ m 4T / m 4W m 2W : Lateral magnification of the second lens group at the wide angle end m 2T : Of the second lens group at the telephoto end Lateral magnification m 3W : Lateral magnification of third lens group at wide-angle end m 3T : Lateral magnification of third lens group at telephoto end m 4W : Lateral magnification of fourth lens group at wide-angle end m 4T : Fourth lens at telephoto end Lateral magnification f 4 : Focal length of 4th lens group f w : Focal length of entire system at wide angle end
ンズの順に配列されたレンズ群を含み、 第４レンズ群は物体側から正レンズ、負レンズの順に配
列されたレンズ群を含み、 かつ以下の条件を満たすことを特徴とする特許請求の範
囲第１項記載のズームレンズ1N −1P＞５ （2P＋3P）/2＜1.74N −4P＞10 ただしiP ;第ｉレンズ群中の正レンズのアッベ数の平均値iN ;第ｉレンズ群中の負レンズのアッベ数の平均値iP :第ｉレンズ群中の正レンズの屈折率の平均値2. The first lens group includes a lens group in which a negative lens and a positive lens are arranged in this order from the object side, and the fourth lens group includes a lens group in which a positive lens and a negative lens are arranged in order from the object side. And the following condition is satisfied, the zoom lens according to claim 1 1N - 1P > 5 ( 2P + 3P ) / 2 <1.7 4N - 4P > 10 where iP ; in the i-th lens group Average value of Abbe number of the positive lens iN ; average value of Abbe number of the negative lens in the i-th lens group iP : average value of refractive index of the positive lens in the i-th lens group
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63222505A JP2676384B2 (en) | 1988-09-07 | 1988-09-07 | Compact zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63222505A JP2676384B2 (en) | 1988-09-07 | 1988-09-07 | Compact zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0272316A JPH0272316A (en) | 1990-03-12 |
| JP2676384B2 true JP2676384B2 (en) | 1997-11-12 |
Family
ID=16783481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63222505A Expired - Fee Related JP2676384B2 (en) | 1988-09-07 | 1988-09-07 | Compact zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2676384B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3029149B2 (en) * | 1991-09-02 | 2000-04-04 | キヤノン株式会社 | Zoom lens |
| US5523888A (en) * | 1993-09-03 | 1996-06-04 | Canon Kabushiki Kaisha | Zoom lens |
| US6028716A (en) | 1993-11-29 | 2000-02-22 | Canon Kabushiki Kaisha | Zoom lens |
| TW319831B (en) * | 1994-07-29 | 1997-11-11 | Canon Kk | |
| JP3590807B2 (en) * | 1995-03-08 | 2004-11-17 | 株式会社ニコン | Zoom lens |
| CN110546544B (en) * | 2017-04-05 | 2022-03-29 | 株式会社尼康 | Variable magnification optical system, optical device, and method of manufacturing variable magnification optical system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5715367B2 (en) * | 1971-10-22 | 1982-03-30 | ||
| US4756609A (en) * | 1987-07-13 | 1988-07-12 | Eastman Kodak Company | Four component compact zoom lens |
-
1988
- 1988-09-07 JP JP63222505A patent/JP2676384B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0272316A (en) | 1990-03-12 |
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