JPH0782150B2 - Telephoto zoom lens - Google Patents

Telephoto zoom lens

Info

Publication number
JPH0782150B2
JPH0782150B2 JP61263100A JP26310086A JPH0782150B2 JP H0782150 B2 JPH0782150 B2 JP H0782150B2 JP 61263100 A JP61263100 A JP 61263100A JP 26310086 A JP26310086 A JP 26310086A JP H0782150 B2 JPH0782150 B2 JP H0782150B2
Authority
JP
Japan
Prior art keywords
lens
lens group
group
negative
positive
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
Application number
JP61263100A
Other languages
Japanese (ja)
Other versions
JPS63116113A (en
Inventor
啓二 守山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikon Corp
Original Assignee
Nikon Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nikon Corp filed Critical Nikon Corp
Priority to JP61263100A priority Critical patent/JPH0782150B2/en
Publication of JPS63116113A publication Critical patent/JPS63116113A/en
Publication of JPH0782150B2 publication Critical patent/JPH0782150B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G02B15/144—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 four groups only
    • G02B15/1441—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 four groups only the first group being positive
    • G02B15/144113—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 four groups only the first group being positive arranged +-++

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はズームレンズ、特に物体側から順に正屈折力の
合焦レンズ群、負屈折力の変倍レンズ群、正屈折力の補
正レンズ群及び正屈折力のリレーレンズから成る４群構
成の望遠ズームレンズに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a zoom lens, in particular, a focusing lens group having positive refracting power, a variable power lens group having negative refracting power, and a correcting lens group having positive refracting power in order from the object side. And a telephoto zoom lens having a four-group configuration including a relay lens having a positive refractive power.

〔従来の技術〕[Conventional technology]

このような構成の望遠ズームレンズは種々の仕様にて実
用化されている。そして、小型な構成にて携帯性を維持
しつつ、ズーム比の大きな仕様とすることが要求されて
きている。The telephoto zoom lens having such a configuration is put to practical use in various specifications. Further, it is required to have a large zoom ratio while maintaining portability with a compact structure.

従来この種のズームレンズは、リレーレンズ群としての
第４レンズ群G4に着目すると、開口絞りが第４レンズ群
のG4の最も物体側に設定され、かつ、射出瞳が像面より
遠くに位置する構造のものが多かった。また、この種の
レンズ系の小型化は、各レンズ群の屈折力を強める方向
で行われてきた。In the conventional zoom lens of this type, focusing on the fourth lens group G 4 as a relay lens group, the aperture stop is set to the most object side of G 4 of the fourth lens group, and the exit pupil is far from the image plane. Many of the structures were located in. Further, miniaturization of this type of lens system has been performed in the direction of increasing the refractive power of each lens group.

〔発明が解決しようとする問題点〕[Problems to be solved by the invention]

このため、バックフォーカスが第４レンズ群G4の全長に
比較してさらに短かくなり、第４レンズ群G4中最も像面
側に有るレンズ面と射出瞳の位置が大きく隔る傾向にあ
った。その結果、最大画角の主光線が第４レンズ群G4中
の最も像面側のレンズ面を通る際の位置が、光軸より大
きく隔ってしまい十分な周辺光量を確保するには第４レ
ンズ群G4中の最も像面側のレンズの有効径を拡大しなけ
ればならず、レンズ口径が大きくなってしまうという欠
点があった。Therefore, further becomes shorter back focus in comparison to the total length of the fourth lens group G 4, there the large隔Ru tendency the position of the exit pupil and lens surface at the extreme image plane side in the fourth lens group G 4 It was As a result, the position at which the chief ray with the maximum angle of view passes through the lens surface closest to the image plane in the fourth lens group G 4 is largely separated from the optical axis, and it is necessary to secure a sufficient amount of peripheral light. There is a drawback in that the effective diameter of the lens closest to the image plane in the four lens group G 4 must be enlarged, and the lens aperture becomes large.

他方、上述の問題を解決し、されに光学系の絞り径を小
さくするために、開口絞りを第４レンズ群G4の中に設定
すれば、射出瞳の位置を像面に近づけることが可能であ
る。しかし、第４レンズ群G4の屈折力が比較的強いうえ
に、入射瞳位置が第１レンズ群G1中の最も物体側レンズ
面より遠ざかってしまう。このため最大画角の主光線が
第１レンズ群G1の最も物体側レンズ面に入射するときの
入射位置が光軸から大きく隔ってしまい、近距離撮影状
態においても、十分な周辺光量を確保するためには、第
１レンズ群G1中の最も物体側に位置するレンズの有効径
を拡大せねばならず、この場合にもレンズ口径の大型化
が必要となるという不都合があった。On the other hand, if the aperture stop is set in the fourth lens group G 4 in order to solve the above-mentioned problems and reduce the stop diameter of the optical system, the position of the exit pupil can be brought close to the image plane. Is. However, the refracting power of the fourth lens group G 4 is relatively strong, and the position of the entrance pupil is farthest from the object-side lens surface in the first lens group G 1 . Therefore, the incident position when the chief ray with the maximum angle of view is incident on the most object-side lens surface of the first lens group G 1 is largely separated from the optical axis, and a sufficient peripheral light amount is obtained even in a short-distance shooting state. In order to ensure this, the effective diameter of the lens located closest to the object side in the first lens group G 1 must be enlarged, and in this case as well, the lens aperture must be increased.

本発明の目的は、ズーミングの全域にわたって優れた結
像性能を有し、かつコンパクトな望遠ズームレンズを提
供することにある。An object of the present invention is to provide a compact telephoto zoom lens that has excellent imaging performance over the entire zooming range.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、物体側から順に正屈折力の合焦レンズ群とし
ての第１レンズ群G1、負屈折力の変倍レンズ群としての
第２レンズ群G2、正屈折力の補正レンズ群としての第３
レンズ群G3及び正屈折力のリレーレンズ群としての第４
レンズ群G4から成る４群構成ズームレンズを基礎とし、
特に変倍群としての第２レンズの具体的レンズ構成、並
びにリレーレンズ群としての第４レンズ群の屈折力及び
具体的レンズ構成を工夫したものである。The present invention relates to a first lens group G 1 as a focusing lens group having a positive refractive power, a second lens group G 2 as a variable power lens group having a negative refractive power, and a correction lens group having a positive refractive power in order from the object side. The third
The fourth lens unit G 3 and a relay lens unit of positive refracting power
Based on a 4-group zoom lens consisting of lens group G 4 ,
In particular, the specific lens configuration of the second lens as the variable power group and the refractive power and specific lens configuration of the fourth lens group as the relay lens group are devised.

すなわち、第２レンズ群G2として３つの負レンズ成分
（L2A、L2B、L2C）を配置し、かつそのうち２つの負レ
ンズ成分は貼合せで構成すると共に、第４レンズ群G4と
して物体側より順に、２つの正レンズ成分（L4A、
L4B）、開口絞りＳ、負レンズ（L4C）及び正レンズ成分
（L4D）を配置したものである。そして各レンズ群に対
する屈折力配分、並びに第２レンズ群G2及び第４レンズ
群G4に関して以下の各条件を満足する構成としたもので
ある。That is, three negative lens components (L 2A , L 2B , L 2C ) are arranged as the second lens group G 2 , and two of these negative lens components are cemented together, and as the fourth lens group G 4 Two positive lens components (L 4A ,
L 4B ), the aperture stop S, the negative lens (L 4C ) and the positive lens component (L 4D ) are arranged. The refractive power distribution to each lens group and the second lens group G 2 and the fourth lens group G 4 are configured to satisfy the following conditions.

0.38＜f4/（f1・Ｚ）＜0.48 （１） 1.35＜|f4/（f2・Ｚ）｜＜1.61 （２） 0.5＜f4/（f3・Ｚ）＜0.6 （３） 0.3＜f4AB/f4＜0.44 （４） ただし、 f1:第１レンズ群G1の焦点距離 f2:第２レンズ群G2の焦点距離 f3:第３レンズ群G3の焦点距離 f4:第４レンズ群G4の焦点距離 Z:ズーム比 f4AB:第４レンズ群G4中、物体側の２つの正レンズ成分
（L4A、L4B）の合成焦点距離 nN1:第２レンズ群G2の負レンズ成分中、最も低い屈折率 nN2:第２レンズ群G2の負レンズ成分中、２番目に低い屈
折率 である。 0.38 <f 4 / (f 1 · Z) <0.48 (1) 1.35 <| f 4 / (f 2 · Z) | <1.61 (2) 0.5 <f 4 / (f 3 · Z) <0.6 (3) 0.3 <f 4AB / f 4 <0.44 (4) Where f 1 is the focal length of the first lens group G 1 , f 2 is the focal length of the second lens group G 2 , f 3 is the focal length of the third lens group G 3 , and f 4 is the focal length of the fourth lens group G 4 . Z: Zoom ratio f 4AB : Composite focal length of the two positive lens components (L 4A , L 4B ) on the object side in the fourth lens group G 4 , n N1 : The most negative lens component of the second lens group G 2. Low refractive index n N2 : The second lowest refractive index of the negative lens components of the second lens group G 2 .

〔作用〕[Action]

このような本発明の構成においては、リレーレンズ群と
しての第４レンズ群G4において、開口絞りを第４レンズ
群G4中に設定した。また、従来のものより第４レンズ群
G4の屈折力を弱くし、さらにバックフォーカスの比較的
長い構造を採用した。その結果、光学系に大きな負荷を
かけることなく、第４レンズ群G4中の最も像面側に位置
するレンズ面との射出瞳との距離を短かくすることが可
能となった。In such a configuration of the present invention, in the fourth lens group G 4 as the relay lens group, the aperture stop is set in the fourth lens group G 4 . In addition, the fourth lens group
We made the refractive power of the G 4 weaker and adopted a structure with a relatively long back focus. As a result, it is possible to shorten the distance between the exit pupil and the lens surface of the fourth lens group G 4 which is located closest to the image plane without imposing a heavy load on the optical system.

さらに、変倍群としての第２レンズ群G2の負レンズ成分
を３つに分割し、それら負レンズ成分に屈折率の低いも
のを採用した。このため近距離状態、特に望遠側におけ
る近距離撮影状態で負に過剰に発生する球面収差変動を
小さく抑え得るため、合焦群としての第１レンズ群G1及
び変倍群としての第２レンズ群G2の屈折力を強め、変倍
系の大きさを小さく構成することが可能となる。これに
より、第１レンズ群G1中も最も物体面に位置するレンズ
面と入射瞳との距離を短かくすることができる。Further, the negative lens component of the second lens unit G 2 as a variable power unit is divided into three, and the negative lens component having a low refractive index is adopted. Therefore, it is possible to suppress the spherical aberration variation that occurs excessively negatively in the short distance state, particularly in the short distance shooting state on the telephoto side. Therefore, the first lens group G 1 as the focusing group and the second lens group as the zooming group It is possible to strengthen the refractive power of the group G 2 and to make the size of the variable power system small. This makes it possible to shorten the distance between the lens surface located closest to the object surface in the first lens group G 1 and the entrance pupil.

上述の如く本発明では、第４レンズ群G4中の最も像面側
のレンズ面と射出瞳との距離及び第１レンズ群G1中の最
も物体側のレンズ面と入射瞳との距離を比較的小さく
し、レンズの有効径を拡大することなく十分な周辺光量
を確保し、かつ第４レンズ群G4の屈折力が弱いにもかか
わらず、変倍系の小型化を実現することにより、レンズ
系全体の小型化を達成し得た。As described above, in the present invention, the distance between the lens surface closest to the image plane in the fourth lens group G 4 and the exit pupil and the distance between the lens surface closest to the object in the first lens group G 1 and the entrance pupil are determined. By making it relatively small, ensuring a sufficient amount of peripheral light without enlarging the effective diameter of the lens, and realizing a downsizing of the zooming system despite the weak refracting power of the fourth lens group G 4. It was possible to achieve downsizing of the entire lens system.

以下に、上記の各条件式について説明する。The above conditional expressions will be described below.

条件式（１）から条件式（３）は、十分な変倍域を有す
る仕様におけるリレーレンズ群としての第４レンズ群G4
の屈折力（1/f4）に対する変倍系各レンズ群Gi（ｉ＝
１、２、３）の屈折力（1/fi）配分を規定している。こ
れらの条件式の上限を超えると変倍系各レンズ群Giの屈
折力が必要以上に強くなり、収差補正上過大な負荷がか
かってしまう。また、第４レンズ群G4の全長が長くなり
過ぎ、光学系全長の小型化が困難となるため、第４レン
ズ群G4を極端な望遠タイプとする必要が生じてしまう。
一方、これら（１）から（３）の各条件式の下限を超え
ると、変倍系が大きくなり、光学系全長の小型化の妨げ
となり好ましくない。また、第４レンズ群G4の屈折力が
強くなり過ぎ、バックフォーカスも十分な長さを保つこ
とができなくなり、最大画角の主光線が第１レンズ群G1
中の最も物体側のレンズ及び第４レンズ群G4中の最も像
面側のレンズを通る際、光軸より大きく隔ったところを
通り、十分な周辺光量を確保するためには、第１レンズ
群G1中の最も物体側のレンズ有効径及び、第４レンズ群
G4中の最も像面側のレンズ有効径を拡大しなければなら
ず、本発明の意図するところに反するので不適当であ
る。The conditional expressions (1) to (3) are the fourth lens group G 4 as the relay lens group in the specification having a sufficient variable power range.
Refractive power (1 / f 4) for the variable magnification system the lens groups G i (i =
It defines the refractive power (1 / f i ) distribution of 1, 2, 3). If the upper limits of these conditional expressions are exceeded, the refractive power of each lens unit G i of the variable power system will become stronger than necessary, and an excessive load will be imposed on aberration correction. Further, the total length of the fourth lens group G 4 becomes too long, and it becomes difficult to reduce the overall length of the optical system. Therefore, it becomes necessary to make the fourth lens group G 4 an extreme telephoto type.
On the other hand, if the lower limits of the respective conditional expressions (1) to (3) are exceeded, the zooming system becomes large, which hinders downsizing of the entire optical system, which is not preferable. Further, the refracting power of the fourth lens group G 4 becomes too strong, and it becomes impossible to maintain a sufficient back focus length, so that the chief ray of the maximum angle of view becomes the first lens group G 1
When passing a lens farthest to the object side and a lens closest to the image plane in the fourth lens group G 4 through a portion largely separated from the optical axis to secure a sufficient peripheral light amount, The lens effective diameter closest to the object in the lens group G 1 and the fourth lens group
This is unsuitable because the lens effective diameter closest to the image plane in G 4 must be enlarged, which is contrary to the intention of the present invention.

条件式（４）は、第４レンズ群G4中の物体側よりの２つ
の正レンズ成分（L4A、L4B)の合成屈折力の適正な配分
を示している。Conditional expression (4) shows an appropriate distribution of the combined refractive power of the two positive lens components (L 4A , L 4B) from the object side in the fourth lens group G 4 .

上限を超えると光学系の絞り径の拡大を招いてしまう。
さらに内向性コマ収差が発生し、収差補正においても好
ましくない。一方、条件式（４）の下限を超えるとペッ
ツバール和が過大に負となり非点収差の補正が困難とな
る。If the upper limit is exceeded, the aperture diameter of the optical system will be increased.
Further, inward coma is generated, which is not preferable in aberration correction. On the other hand, if the lower limit of conditional expression (4) is exceeded, the Petzval sum becomes excessively negative, making it difficult to correct astigmatism.

条件式（５）は、第２レンズ群G2中の負レンズ成分の屈
折率の最も低いものと、その次に低いものとの平均値を
示している。Conditional expression (5) represents the average value of the lowest refractive index and the second lowest refractive index of the negative lens component in the second lens group G 2 .

上限を超えると、近距離状態において負の球面収差が過
大に発生し、第１レンズ群G1の収差補正の負担が大きく
なる。このため、第１レンズ群G1の屈折力を強めること
が困難となり、レンズ系の小型化を図るためには好まし
くない。一方、条件式（５）の下限を超えると、より低
い屈折率の材料を負レンズに使用することになるため、
ズーミングによる収差変動が発生しやすくなる。このた
め第２レンズ群G2の屈折力を強めることが困難となり、
レンズ系の小型化を図るためには不都合である。さらに
ペッツバール和も過大に負となり非点収差の補正が困難
となる。When the value exceeds the upper limit, negative spherical aberration excessively occurs in a short-distance state, and the burden of aberration correction on the first lens group G 1 increases. Therefore, it becomes difficult to increase the refracting power of the first lens group G 1 , which is not preferable for downsizing the lens system. On the other hand, if the lower limit of conditional expression (5) is exceeded, a material having a lower refractive index will be used for the negative lens.
Aberration variation due to zooming is likely to occur. Therefore, it becomes difficult to increase the refractive power of the second lens group G 2 ,
This is inconvenient for reducing the size of the lens system. Furthermore, the Petzval sum becomes too negative, making it difficult to correct astigmatism.

以上の如き本発明の構成において、さらにより望ましい
条件として以下のものがある。In the configuration of the present invention as described above, there are the following more desirable conditions.

0.14＜f2/f2B＜0.4 （６） 0.2＜f2/f2C＜0.45 （７） 0.55＜q2C＜0.95 （８） 0.85＜q4A＜1.4 （９） ただし、 f2B:第２レンズ群G2中の第２負レンズ成分L2Bの焦点距
離 f2C:第２レンズ群G2中の第３負レンズ成分L2Cの焦点距
離 q2C:第２レンズ群G2中の第３負レンズ成分L2Cの形状因
子 q4A:第４レンズ群G4中の最も物体側に位置する正レンズ
成分L4Aの形状因子 である。形状因子ｑはそのレンズの物体側レンズ面の曲
率半径をra、像面像の曲率半径をrbとするとき ｑ＝（rb＋ra）／（rb−ra） で定義されるものとする。0.14 <f 2 / f 2B <0.4 (6) 0.2 <f 2 / f 2C <0.45 (7) 0.55 <q 2C <0.95 (8) 0.85 <q 4A <1.4 (9) However, f 2B : Second lens the focal length f 2C of the second negative lens component L 2B in group G 2: focal length q 2C of the third negative lens component L 2C of the second lens group G 2: third negative second lens group G 2 Form factor q 4A of lens component L 2C : Form factor of the positive lens component L 4A located closest to the object side in the fourth lens group G 4 . The form factor q is defined by q = (r b + r a ) / (r b −r a ), where r a is the radius of curvature of the lens surface on the object side of the lens and r b is the radius of curvature of the image plane image. I shall.

（６）式は第２レンズ群G2中の第２負レンズ成分L2Bの
適正な屈折力配分を規定している。上限を超えると望遠
側で非点収差が過大に正となり、さらに内向性コマ収差
が発生するため不適当である。下限を外れると逆に非点
収差が過大に負となり、さら外向性コマ収差が発生する
ため不適当である。Expression (6) defines an appropriate distribution of the refractive power of the second negative lens component L 2B in the second lens group G 2 . If the upper limit is exceeded, the astigmatism will become excessively positive on the telephoto side, and inward coma will occur, which is unsuitable. If the value goes below the lower limit, on the contrary, the astigmatism becomes excessively negative, and further outward coma is generated, which is unsuitable.

（７）式は第２レンズ群G2中の第３負レンズ成分L2Cの
適正な屈折力配分を示している。上限を超えると望遠側
で球面収差が過大に正となり不適当である。下限を超え
ると逆に負の球面収差が過大に発生するので不適当であ
る。Expression (7) shows an appropriate distribution of the refractive power of the third negative lens component L 2C in the second lens group G 2 . If the upper limit is exceeded, spherical aberration becomes excessively positive on the telephoto side, which is unsuitable. If the value goes below the lower limit, negative spherical aberration is excessively generated, which is unsuitable.

（８）式は球面収差及び非点収差のバランスを適正なら
しめるための条件である。上限を超えると望遠側で負の
球面収差が過大に発生し、さらに非点収差が過大に正と
なり不適当である。下限を外れるとその逆の傾向が大き
くなる。Expression (8) is a condition for making the balance between spherical aberration and astigmatism appropriate. When the value exceeds the upper limit, negative spherical aberration is excessively generated on the telephoto side, and astigmatism is excessively positive, which is unsuitable. When the value goes below the lower limit, the opposite tendency increases.

（９）式は球面収差及びコマ収差を適正にバランスさせ
るための条件である。上限を超えると球面収差が過大に
負となり、下限を超えるとその逆の傾向が大きくなる。Expression (9) is a condition for properly balancing spherical aberration and coma. If the upper limit is exceeded, the spherical aberration will be excessively negative, and if the lower limit is exceeded, the opposite tendency will increase.

さらに後記する第１〜第４実施例において合焦群として
の第１レンズ群G1は物体側より貼合せ正レンズ成分L1A
と単一正レンズ成分L1Bとで構成されている。その構成
においてさらに望ましい条件として以下のものがある。Further, in the first to fourth embodiments described later, the first lens group G 1 as a focusing group has a cemented positive lens component L 1A from the object side.
And a single positive lens component L 1B . More desirable conditions in the configuration are as follows.

0.4＜q1A＜1.0 （10） 0.3＜f2/f2A＜0.5 （11） −1.3＜q4C＜−0.7 （12） ただし、 q1A:第１レンズ群G1中の貼合せレンズ成分L1Aの形状因
子 f2A:第２レンズ群G2中の第１負レンズ成分L2Aの焦点距
離 q4C:第４レンズ群G1中の開口絞りより像面側に位置する
負レンズ成分L4Cの形状因子 である。0.4 <q 1A <1.0 (10) 0.3 <f 2 / f 2A <0.5 (11) −1.3 <q 4C <−0.7 (12) where q 1A is the cemented lens component L in the first lens group G 1. Form factor of 1A f 2A : Focal length of the first negative lens component L 2A in the second lens group G 2 q 4C : Negative lens component L 4C located in the image side of the aperture stop in the fourth lens group G 1. Is the form factor of.

〔実施例〕〔Example〕

以下に本発明による実施例について説明する。本発明に
よる第１実施例は、第１レンズ群G1が貼合せの正レンズ
成分L1Aと単一の正レンズ成分L1Bとで構成され、第２レ
ンズ群G2が物体側から順に、正レンズと両凹負レンズと
の貼合せで形成された負レンズ成分L2Aと、両凹負レン
ズと正レンズとの貼合せで形成された負レンズ成分
L2B、そして単一の両凹負レンズ成分L2Cとで構成されて
いる。また、第３レンズ群G3は単一の正レンズ成分L3A
と貼合せの正レンズL3Bとで構成されている。開口絞り
を有する第４レンズ群G4は物体側から順に、物体側によ
り強い曲率の面を向けた単一正レンズ成分L4A、正レン
ズと負レンズとの貼合せからなり、より強い曲率の面を
物体側に向けた正レンズ成分L4B、開口絞りＳ、像面側
により強い曲率の面を向けた負レンズ成分L4C及び単一
正レンズ成分L4Dとで構成されている。Examples according to the present invention will be described below. In the first embodiment according to the present invention, the first lens group G 1 is composed of a cemented positive lens component L 1A and a single positive lens component L 1B, and the second lens group G 2 is arranged in order from the object side. Negative lens component L 2A formed by laminating a positive lens and a biconcave negative lens, and negative lens component L 2A formed by laminating a biconcave negative lens and a positive lens
L 2B , and a single biconcave negative lens component L 2C . The third lens group G 3 is a single positive lens component L 3A.
It is composed of a positive lens L 3B and a positive lens L 3B . The fourth lens group G 4 having an aperture stop comprises, in order from the object side, a single positive lens component L 4A with a surface having a stronger curvature facing the object side, and a positive lens and a negative lens cemented together. It is composed of a positive lens component L 4B whose surface is directed toward the object side, an aperture stop S, a negative lens component L 4C whose surface has a stronger curvature toward the image side, and a single positive lens component L 4D .

以下の表１に第１実施例の諸元を示す。表中、左端の数
字は物体側からの順序を表し、屈折率及びアッベ数はｄ
線（λ＝587.6nm）に対する値である。（以下の実施例
についても同様） 上記第１実施例について諸収差図を第2A図〜第2C図に示
す。第2A図は広角端（ｆ＝100.0）、第2B図は中間（ｆ
＝200.0）、第2C図は望遠端（ｆ＝300.0）における諸収
差図である。Table 1 below shows the specifications of the first embodiment. In the table, the leftmost number represents the order from the object side, and the refractive index and Abbe number are d.
The value is for the line (λ = 587.6 nm). (The same applies to the following examples) Aberration diagrams of the first embodiment are shown in FIGS. 2A to 2C. Fig. 2A shows the wide-angle end (f = 100.0), and Fig. 2B shows the middle (f = 100.0).
= 200.0), and FIG. 2C is a diagram of various types of aberration at the telephoto end (f = 300.0).

本発明による第２実施例〜第４実施例は、上記第１実施
例と同様のレンズ構成からなっているが、各レンズ群を
構成するレンズ成分の材料もしくは屈折力配分を変更し
て収差補正を行ったものである。The second embodiment to the fourth embodiment according to the present invention have the same lens configuration as that of the first embodiment, but the aberration correction is performed by changing the material of the lens component or the refractive power distribution of each lens group. Was done.

以下の表２〜表４に、第２実施例〜第４実施例の諸元を
示す。Tables 2 to 4 below show specifications of the second to fourth examples.

上記第２実施例〜第４実施例についての諸収差図を第3
A、3B、3C図〜第5A、5B、5C図にそれぞれ示す。 The various aberration diagrams for the second to fourth examples are shown in FIG.
Figures A, 3B and 3C to 5A, 5B and 5C are shown respectively.

各諸収差図において、Ａは広角端（ｆ＝100.0）、Ｂは
中間（ｆ＝200.0）、Ｃは望遠端（ｆ＝300.0）における
諸収差図である。In each aberration diagram, A is an aberration diagram at the wide-angle end (f = 100.0), B is an intermediate (f = 200.0), and C is an aberration diagram at the telephoto end (f = 300.0).

各実施例についての諸収差図から、いずれの実施例も全
変倍域にわたって、優れた結像性能を維持していること
が明らかである。It is clear from the various aberration diagrams for each example that all examples maintain excellent imaging performance over the entire zoom range.

〔効果〕〔effect〕

以上の各実施例の諸収差図より明らかな如く、本発明に
よれば変倍域の全体にわたって優れた結像性能を有する
望遠ズームレンズが達成される。As is clear from the various aberration diagrams of the above-described examples, the present invention can achieve a telephoto zoom lens having excellent imaging performance over the entire zoom range.

【図面の簡単な説明】[Brief description of drawings]

第１図は、本発明による第１実施例のレンズ構成図、第
2A、2B、2C図は第１実施例についての諸収差図、第3A、
3B、3C図は第２実施例についての諸収差図、第4A、4B、
4C図は第３実施例についての諸収差図、第5A、5B、5C図
は第４実施例についての諸収差図である。 （主要部分の符号の説明） G1……第１レンズ群 G2……第２レンズ群 G3……第３レンズ群 G4……第４レンズ群 Ｓ……開口絞りFIG. 1 is a lens configuration diagram of a first embodiment according to the present invention,
2A, 2B, and 2C are aberration diagrams for the first embodiment, 3A,
3B and 3C are graphs showing various aberrations of the second embodiment, 4A, 4B,
FIG. 4C is a diagram of various aberrations of the third example, and FIGS. 5A, 5B, and 5C are diagrams of various aberrations of the fourth example. (Explanation of symbols of main parts) G 1 ... first lens group G 2 ... second lens group G 3 ... third lens group G 4 ... fourth lens group S ... aperture stop

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】物体側から順に、正屈折力の合焦レンズ群
としての第１レンズ群G1、負屈折力の変倍レンズ群とし
ての第２レンズ群G2、正屈折力の補正レンズ群としての
第３レンズ群G3及び正屈折力のリレーレンズ群としての
第４レンズ群G4から成る４群構成ズームレンズにおい
て、前記第２レンズ群は３つの負レンズ成分（L2A、
L2B、L2C）を有し、そのうち２つの負レンズ成分は貼合
せで構成されると共に、前記第４レンズ群G4は物体側よ
り順に、２つの正レンズ成分（L4A、L4B）、開口絞り
Ｓ、負レンズ（L4C）及び正レンズ成分（L4D）を有し、
以下の各条件を満足することを特徴とする望遠ズームレ
ンズ。 0.38＜f4/（f1・Ｚ）＜0.48 （１） 1.35＜|f4/（f2・Ｚ）｜＜1.61 （２） 0.5＜f4/（f3・Ｚ）＜0.6 （３） 0.3＜f4AB/f4＜0.44 （４） ただし、 f1:第１レンズ群G1の焦点距離 f2:第２レンズ群G2の焦点距離 f3:第３レンズ群G3の焦点距離 f4:第４レンズ群G4の焦点距離 Z:ズーム比 f4AB:第４レンズ群G4中、物体側の２つの正レンズ成分
（L4A、L4B）の合成焦点距離 nN1:第２レンズ群G2の負レンズ成分中、最も低い屈折率 nN2:第２レンズ群G2の負レンズ成分中、２番目に低い屈
折率1. A first lens group G 1 as a focusing lens group having a positive refractive power, a second lens group G 2 as a variable power lens group having a negative refractive power, and a correction lens having a positive refractive power in order from the object side. In a 4-group zoom lens including a third lens group G 3 as a group and a fourth lens group G 4 as a relay lens group having a positive refractive power, the second lens group has three negative lens components (L 2A ,
L 2B , L 2C ), two negative lens components of which are cemented together, and the fourth lens group G 4 has two positive lens components (L 4A , L 4B ) in order from the object side. , An aperture stop S, a negative lens (L 4C ) and a positive lens component (L 4D ),
A telephoto zoom lens characterized by satisfying the following conditions. 0.38 <f 4 / (f 1 · Z) <0.48 (1) 1.35 <| f 4 / (f 2 · Z) | <1.61 (2) 0.5 <f 4 / (f 3 · Z) <0.6 (3) 0.3 <f 4AB / f 4 <0.44 (4) Where f 1 is the focal length of the first lens group G 1 , f 2 is the focal length of the second lens group G 2 , f 3 is the focal length of the third lens group G 3 , and f 4 is the focal length of the fourth lens group G 4 . Z: Zoom ratio f 4AB : Composite focal length of the two positive lens components (L 4A , L 4B ) on the object side in the fourth lens group G 4 , n N1 : The most negative lens component of the second lens group G 2. Low refractive index n N2 : second lowest refractive index of negative lens component of the second lens group G 2
JP61263100A 1986-11-05 1986-11-05 Telephoto zoom lens Expired - Fee Related JPH0782150B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61263100A JPH0782150B2 (en) 1986-11-05 1986-11-05 Telephoto zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61263100A JPH0782150B2 (en) 1986-11-05 1986-11-05 Telephoto zoom lens

Publications (2)

Publication Number Publication Date
JPS63116113A JPS63116113A (en) 1988-05-20
JPH0782150B2 true JPH0782150B2 (en) 1995-09-06

Family

ID=17384821

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61263100A Expired - Fee Related JPH0782150B2 (en) 1986-11-05 1986-11-05 Telephoto zoom lens

Country Status (1)

Country Link
JP (1) JPH0782150B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009198800A (en) * 2008-02-21 2009-09-03 Sony Corp Collapsible zoom lens
CN102576147A (en) * 2009-12-09 2012-07-11 株式会社尼康 Zoom lens for microscope, and microscope
JP5658498B2 (en) * 2010-07-23 2015-01-28 株式会社シグマ Large-aperture telephoto zoom lens with anti-vibration function

Also Published As

Publication number Publication date
JPS63116113A (en) 1988-05-20

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