JPH09203859A - Telephoto lens - Google Patents
Telephoto lensInfo
- Publication number
- JPH09203859A JPH09203859A JP1093496A JP1093496A JPH09203859A JP H09203859 A JPH09203859 A JP H09203859A JP 1093496 A JP1093496 A JP 1093496A JP 1093496 A JP1093496 A JP 1093496A JP H09203859 A JPH09203859 A JP H09203859A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- group
- positive
- negative
- refractive power
- 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- Withdrawn
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- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はリヤーフォーカス式
の望遠レンズに関し、特にフォーカスを行う際の物体距
離全般にわたって収差変動が少なく高い光学性能を有し
た３５ｍｍフィルム用の写真用カメラやビデオカメラ、
電子スチルカメラ等に好適な望遠レンズに関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear-focus type telephoto lens, and more particularly to a 35 mm film photographic camera or video camera having high optical performance with little aberration variation over the entire object distance when focusing.
The present invention relates to a telephoto lens suitable for an electronic still camera and the like.
【０００２】[0002]
【従来の技術】一般に撮影レンズにおけるフォーカス
は、撮影レンズ全体を移動させたり、若しくは撮影レン
ズ中の一部のレンズを移動させたりして行っている。こ
のうち撮影レンズが長焦点距離を有する望遠レンズの場
合はレンズ系が大型となり、また重量が大きくなるた
め、レンズ系全体を移動させてフォーカスを行うのが機
械的に困難である。2. Description of the Related Art Generally, focusing in a taking lens is performed by moving the entire taking lens or moving a part of the taking lenses. In the case where the taking lens is a telephoto lens having a long focal length, the lens system becomes large and heavy, and it is mechanically difficult to move the entire lens system for focusing.
【０００３】このため、従来より多くの望遠レンズにお
いてはレンズ系内の比較的小型でしかも軽量の後方レン
ズ群の一部のレンズ群を光軸上移動させてフォーカスを
行うリヤーフォーカス式を用いた望遠レンズが種々提案
されている。For this reason, in many telephoto lenses conventionally used, a rear focus type is used in which a part of a relatively small and lightweight rear lens group in the lens system is moved along the optical axis for focusing. Various telephoto lenses have been proposed.
【０００４】しかしながら、リヤーフォーカス式ではフ
ォーカスの際の収差変動が大きく、特に近距離物体に対
する球面収差の変動が大きくなり、結像性能が低下して
くるなどの問題点があった。However, in the rear focus type, there is a problem in that the fluctuation of aberrations during focusing is large, especially the fluctuation of spherical aberration for a short-distance object is large, and the image forming performance is deteriorated.
【０００５】これに対して、特開平１−１０２４１３号
公報、特開平６−２４２３７１号公報等ではリヤーフォ
ーカスを採用する際、フォーカスレンズ群の前方に像面
側へ凹面を向けたメニスカス状の負レンズを配置してフ
ォーカスの際の球面収差の変動を補正した望遠レンズを
提案している。しかしながら、前記公報では球面収差の
変動が充分に補正されていなかった。On the other hand, in JP-A-1-102413, JP-A-6-242371, etc., when rear focus is adopted, a negative meniscus shape having a concave surface facing the image side in front of the focus lens group is adopted. We have proposed a telephoto lens in which the lens is arranged to correct the fluctuation of spherical aberration during focusing. However, in the above publication, the variation of spherical aberration has not been sufficiently corrected.
【０００６】[0006]
【発明が解決しようとする課題】一般にリヤーフォーカ
ス式で大口径比の長焦点距離の望遠レンズは、前記公報
においても近距離物体に対する球面収差の変動が大き
く、物体距離全般にわたり高い光学性能を得ることが難
しくなってくるという問題点がある。Generally, a rear-focus type telephoto lens having a large aperture ratio and a long focal length has a large variation of spherical aberration with respect to a short-distance object and obtains high optical performance over the entire object distance. There is a problem that it becomes difficult.
【０００７】本発明は望遠レンズにおいて、フォーカス
の際の物体距離全般にわたり収差変動が少なく高い光学
性能を有した焦点距離４００ｍｍ、Ｆナンバ−２．８程
度の写真用カメラやビデオカメラ等に好適なリヤーフォ
ーカス式の望遠レンズの提供を目的とする。INDUSTRIAL APPLICABILITY The present invention is suitable for a telephoto lens, such as a photographic camera or video camera having a focal length of 400 mm and an F number of about 2.8, which has high optical performance with little aberration variation over the entire object distance during focusing. The purpose is to provide a rear focus type telephoto lens.
【０００８】[0008]
【課題を解決するための手段】物体側より順に正の屈折
力の第１群、負の屈折力の第２群、そして正の屈折力の
第３群の３つのレンズ群を有し、該第２群を光軸上移動
させてフォーカスを行い、該第３群は１枚の負レンズと
１枚の正レンズからなり、該正レンズの屈折力をＮとし
たとき １．８２ ＜ Ｎ ＜ １．９０ ・・・・（１） を満たすと共に、第２群の焦点距離をｆ２、全系の焦点
距離をｆとしたとき −０．７０ ＜ ｆ２／ｆ ＜ −０．４１０ ・・・・（２） なる条件を満足することを特徴としている。A first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power are provided in this order from the object side. Focusing is performed by moving the second lens group on the optical axis, and the third lens group is composed of one negative lens and one positive lens, where 1.82 <N <when the refractive power of the positive lens is N. When the focal length of the second lens unit is f2 and the focal length of the entire system is f, -0.70 <f2 / f <-0.410 ... (2) is characterized in that the following condition is satisfied.
【０００９】更なる特徴事項は、以下の実施例に開示さ
れている。Further features are disclosed in the examples below.
【００１０】[0010]
【発明の実施の形態】図１、２、３は各々本発明の後述
する数値実施例１、２、３のレンズ断面図、図４、５、
６は各々数値実施例１、２、３の収差図である。収差図
において、（Ａ）は無限遠物体、（Ｂ）は物体距離４ｍ
の場合を示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1, 2, and 3 are lens cross-sectional views of Numerical Embodiments 1, 2, and 3 described later, respectively, and FIGS.
6 is an aberration diagram of Numerical Examples 1, 2, and 3, respectively. In the aberration diagram, (A) is an object at infinity, (B) is an object distance of 4 m
Shows the case.
【００１１】図中、Ｌ１は正の屈折力の第１群、Ｌ２は
負の屈折力の第２群、Ｌ３は正の屈折力の第３群であ
る。無限遠物体から近距離物体へのフォーカスは、第２
群Ｌ２を像面側へ移動させることにより行っている。In the figure, L1 is a first group having a positive refractive power, L2 is a second group having a negative refractive power, and L3 is a third group having a positive refractive power. Focusing from infinity to near objects is
This is performed by moving the group L2 to the image plane side.
【００１２】次に本発明の光学的特徴について説明す
る。正の屈折力の第１群では負の球面収差が発生し、続
く負の屈折力の第２群では正の球面収差を発生させて第
１群と第２群との合成では正の球面収差とし、最終の第
３群で負の球面収差を発生させて球面収差をバランス良
く打ち消す補正を物体距離全般にわたって行っている。Next, the optical characteristics of the present invention will be described. Negative spherical aberration is generated in the first lens group having positive refractive power, and positive spherical aberration is generated in the second lens group having negative refractive power, and positive spherical aberration is generated in the combination of the first lens group and the second lens group. Then, a negative spherical aberration is generated in the final third lens group to correct the spherical aberration in a well-balanced manner over the entire object distance.
【００１３】この様なキャンセル構造において条件式
（１）は、球面収差、コマ収差及び非点収差をバランス
良く補正するための条件であり、条件をはずれると全体
の収差バランスがくずれ球面収差、コマ収差及び非点収
差が悪化してくるので良くない。In such a canceling structure, the conditional expression (1) is a condition for correcting spherical aberration, coma aberration and astigmatism in a well-balanced manner. Aberration and astigmatism are aggravated, which is not good.
【００１４】更に条件式（２）は、球面収差と非点収差
を良好に補正するための条件式であり、上限値を越える
と球面収差が補正不足となり、下限値を越えると球面収
差が補正過剰となる。また条件式をはずれると非点収差
が悪化するので良くない。更に望ましくは条件式（２）
の範囲を−０．４６０ ＜ ｆ２／ｆ ＜ −０．４１
２、程度にするとよい。Further, the conditional expression (2) is a conditional expression for favorably correcting spherical aberration and astigmatism. When the upper limit is exceeded, the spherical aberration is insufficiently corrected, and when the lower limit is exceeded, the spherical aberration is corrected. Too much. If the conditional expression is not satisfied, the astigmatism will deteriorate, which is not good. More preferably, conditional expression (2)
The range of -0.460 <f2 / f <-0.41
It should be 2 or so.
【００１５】また本実施例において、画面全体の光学特
性を良好に維持しつつフォーカスの際の収差変動を少な
くし、物体距離全般にわたり高い光学性能を得るには、
前記第１群を物体側より順に両レンズ面が凸面の正レン
ズ、物体側へ強い屈折力の凸面を向けた正レンズ、両レ
ンズ面が凹面の負レンズ、物体側へ強い屈折力の凸面を
向けた正レンズ、そして像面側へ凹面を向けたメニスカ
ス状の負レンズから構成し、前記第２群を正レンズと負
レンズとの貼り合わせレンズから構成し、前記第３群を
負レンズと正レンズとの貼り合わせレンズから構成する
のがよい。Further, in this embodiment, in order to obtain high optical performance over the entire object distance while keeping good optical characteristics of the entire screen and reducing aberration fluctuations during focusing,
In the first group, in order from the object side, a positive lens whose both lens surfaces are convex surfaces, a positive lens whose convex surface has a strong refractive power toward the object side, a negative lens whose both lens surfaces are concave surfaces, and a convex surface having a strong refractive power toward the object side are formed. A negative lens having a meniscus shape with a concave surface facing the image side, the second group is a cemented lens of a positive lens and a negative lens, and the third group is a negative lens. It is preferable to use a cemented lens with a positive lens.
【００１６】次に本発明の数値実施例を示す。数値実施
例においてＲｉは物体側より順に第ｉ番目のレンズ面の
曲率半径、Ｄｉは物体側より順に第ｉ番目のレンズ厚及
び空気間隔、Ｎｉとνｉは各々物体側より順に第ｉ番目
のレンズのｄ線屈折率とアッベ数である。Next, numerical examples of the present invention will be described. In Numerical Examples, Ri is the radius of curvature of the i-th lens surface in order from the object side, Di is the i-th lens thickness and air gap in order from the object side, and Ni and vi are the i-th lens in order from the object side, respectively. Is the d-line refractive index and the Abbe number.
【００１７】また前述の各条件式と数値実施例における
諸数値との関係を表１に示す。Table 1 shows the relationship between the above-mentioned conditional expressions and various numerical values in the numerical examples.
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【表２】 [Table 2]
【００２０】[0020]
【発明の効果】本発明によれば望遠レンズの各レンズ群
を前述の如く設定し、第２群を光軸上移動させてフォー
カスを行うことにより、無限遠物体から至近物体に至る
物体距離全般にわたり良好に収差変動を行った高い光学
性能を有した望遠レンズを達成することが可能となる。According to the present invention, by setting each lens group of the telephoto lens as described above and moving the second group on the optical axis for focusing, the overall object distance from the infinitely distant object to the closest object is obtained. It is possible to achieve a telephoto lens having high optical performance with excellent aberration variation over the entire range.
【図１】本発明の数値実施例１のレンズ断面図。FIG. 1 is a lens cross-sectional view of Numerical Example 1 of the present invention.
【図２】本発明の数値実施例２のレンズ断面図。FIG. 2 is a lens cross-sectional view of Numerical Example 2 of the present invention.
【図３】本発明の数値実施例３のレンズ断面図。FIG. 3 is a lens cross-sectional view of Numerical Example 3 of the present invention.
【図４】本発明の数値実施例１の諸収差図。FIG. 4 is a diagram of various types of aberration in Numerical example 1 of the present invention.
【図５】本発明の数値実施例２の諸収差図。FIG. 5 is a diagram of various types of aberration of Numerical example 2 of the present invention.
【図６】本発明の数値実施例３の諸収差図。FIG. 6 is a diagram of various types of aberration in Numerical example 3 of the present invention.
Ｌ１ 第１群 Ｌ２ 第２群 Ｌ３ 第３群 △Ｓ サジタル像面 △Ｍ メリディオナル像面 ＳＣ 正弦条件 L1 1st group L2 2nd group L3 3rd group ΔS Sagittal image surface ΔM Meridional image surface SC Sine condition
Claims (3)
の屈折力の第２群、そして正の屈折力の第３群の３つの
レンズ群を有し、該第２群を光軸上移動させてフォーカ
スを行い、該第３群は１枚の負レンズと１枚の正レンズ
からなり、該正レンズの屈折率をＮとしたとき １．８２ ＜ Ｎ ＜ １．９０ を満たすと共に、第２群の焦点距離をｆ２、全系の焦点
距離をｆとしたとき −０．７０ ＜ ｆ２／ｆ ＜ −０．４１０ なる条件を満足することを特徴とする望遠レンズ。1. A three-lens group including a first group having a positive refractive power, a second group having a negative refractive power, and a third group having a positive refractive power in order from the object side. Focusing is performed by moving on the optical axis, and the third group consists of one negative lens and one positive lens, and when the refractive index of the positive lens is N, 1.82 <N <1.90 A telephoto lens satisfying the above condition, which satisfies the condition of −0.70 <f2 / f <−0.410, where f2 is the focal length of the second lens group and f is the focal length of the entire system.
スカス状の負レンズを有することを特徴とする特許請求
項１の望遠レンズ。2. The telephoto lens according to claim 1, wherein the first group includes a meniscus negative lens having a concave surface facing the image plane side.
が凸面の正レンズ、物体側へ強い屈折力の凸面を向けた
正レンズ、両レンズ面が凹面の負レンズ、物体側へ強い
屈折力の凸面を向けた正レンズ、そして像面側へ凹面を
向けたメニスカス状の負レンズから成り、前記第２群は
正レンズと負レンズとの貼り合わせレンズから成り、前
記第３群は負レンズと正レンズとの貼り合わせレンズか
ら成ることを特徴とする特許請求項１の望遠レンズ。3. The first lens group, in order from the object side, has a positive lens whose both lens surfaces are convex surfaces, a positive lens whose convex surface has a strong refractive power toward the object side, a negative lens whose both lens surfaces are concave surfaces, and a strong lens surface toward the object side. It consists of a positive lens with a convex surface of refractive power and a meniscus negative lens with a concave surface facing the image side. The second group is a cemented lens of a positive lens and a negative lens, and the third group is 2. The telephoto lens according to claim 1, comprising a cemented lens of a negative lens and a positive lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1093496A JPH09203859A (en) | 1996-01-25 | 1996-01-25 | Telephoto lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1093496A JPH09203859A (en) | 1996-01-25 | 1996-01-25 | Telephoto lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09203859A true JPH09203859A (en) | 1997-08-05 |
Family
ID=11764066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1093496A Withdrawn JPH09203859A (en) | 1996-01-25 | 1996-01-25 | Telephoto lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09203859A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000227546A (en) * | 1999-02-04 | 2000-08-15 | Asahi Optical Co Ltd | Middle telephotographic lens |
| US6115188A (en) * | 1997-10-16 | 2000-09-05 | Canon Kabushiki Kaisha | Optical system and optical apparatus having the same |
| JP2000258685A (en) * | 1999-03-10 | 2000-09-22 | Canon Inc | Photographing optical system |
| US7715116B2 (en) | 2007-04-11 | 2010-05-11 | Hoya Corporation | Telephoto lens system |
| US9405094B2 (en) | 2012-05-30 | 2016-08-02 | Nikon Corporation | Photographing lens, optical apparatus and method for manufacturing the photographing lens |
-
1996
- 1996-01-25 JP JP1093496A patent/JPH09203859A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6115188A (en) * | 1997-10-16 | 2000-09-05 | Canon Kabushiki Kaisha | Optical system and optical apparatus having the same |
| JP2000227546A (en) * | 1999-02-04 | 2000-08-15 | Asahi Optical Co Ltd | Middle telephotographic lens |
| JP2000258685A (en) * | 1999-03-10 | 2000-09-22 | Canon Inc | Photographing optical system |
| US7715116B2 (en) | 2007-04-11 | 2010-05-11 | Hoya Corporation | Telephoto lens system |
| US9405094B2 (en) | 2012-05-30 | 2016-08-02 | Nikon Corporation | Photographing lens, optical apparatus and method for manufacturing the photographing lens |
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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: 20030401 |