JPH06308389A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPH06308389A JPH06308389A JP5114105A JP11410593A JPH06308389A JP H06308389 A JPH06308389 A JP H06308389A JP 5114105 A JP5114105 A JP 5114105A JP 11410593 A JP11410593 A JP 11410593A JP H06308389 A JPH06308389 A JP H06308389A
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- group
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- refracting power
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- zoom lens
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は３５ｍｍフィルム用の写
真用カメラや電子記録用のビデオカメラそしてＳＶカメ
ラ等に好適なズームレンズに関し、特に負の屈折力のレ
ンズ群が先行する全体として５つのレンズ群を有し、こ
れら５つのレンズ群の変倍に伴う移動条件やフォーカス
の際に移動させるレンズ群等を適切に設定することによ
り全変倍範囲にわたり高い光学性能を有し、かつ超近接
撮影を可能とした広画角域を含むズームレンズに関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens suitable for a photographic camera for 35 mm film, a video camera for electronic recording, an SV camera and the like. It has a lens group and has high optical performance over the entire zoom range by setting the moving conditions for zooming these 5 lens groups and the lens group to be moved during focusing properly The present invention relates to a zoom lens including a wide angle of view that enables photographing.
【０００２】[0002]
【従来の技術】従来より負の屈折力のレンズ群が先行す
る所謂ネガティブリード型のズームレンズは広画角化が
比較的容易である為、広画角用のズームレンズに多く用
いられている。例えば特公昭４９−２３９１２号公報や
特開昭５７−１６３２１３号公報等では物体側より順に
負の屈折力の第１群、正の屈折力の第２群、負の屈折力
の第３群そして正の屈折力の第４群の４つのレンズ群を
有し、広角端から望遠端への変倍に際して、第１群を像
面側へ移動させ、第２群と第４群を物体側へ移動させ、
第３群を固定若しくは移動させたズームレンズが提案さ
れている。2. Description of the Related Art Conventionally, a so-called negative lead type zoom lens in which a lens unit having a negative refracting power precedes is relatively easy to make a wide angle of view, and is therefore often used as a zoom lens for a wide angle of view. . For example, in JP-B-49-23912 and JP-A-57-163213, the first group having negative refracting power, the second group having positive refracting power, the third group having negative refracting power, and It has 4 lens groups of 4th group of positive refracting power, and at the time of zooming from the wide-angle end to the telephoto end, the first group is moved to the image side, and the second and fourth groups are moved to the object side. Move
A zoom lens in which the third group is fixed or moved has been proposed.
【０００３】このような負の屈折力のレンズ群が先行す
るネガティブリード型のズームレンズは比較的広画角化
が容易で、かつ近接撮影距離が短くなる等の特徴を有し
ている。A negative lead type zoom lens, which is preceded by such a lens unit having a negative refracting power, is characterized in that it is relatively easy to widen the angle of view and that the close-up photographing distance is shortened.
【０００４】しかしながら高変倍化を図りつつ、レンズ
系全体の小型化を図る為に各レンズ群の屈折力を強める
と諸収差の発生が多くなり光学性能が大きく劣化してく
る。又大口径化を図ろうとすると絞り径が増大し、レン
ズ系全体が大型化してくるという問題が生じてくる。However, if the refracting power of each lens group is increased in order to reduce the size of the entire lens system while achieving a high zoom ratio, various aberrations will occur and the optical performance will be greatly deteriorated. Further, if an attempt is made to increase the aperture, the diameter of the diaphragm will increase, and the size of the entire lens system will increase.
【０００５】これらの欠点を改善しレンズ系全体の小型
化及び高変倍化を図ったズームレンズが、例えば特公昭
５５−１４４０３号公報、特開昭６３−２４１５１１号
公報、特開平１−１９３７０９号公報等で提案されてい
る。Zoom lenses that have been improved in view of these drawbacks and have been made compact and have a high zoom ratio are disclosed in, for example, Japanese Patent Publication No. 55-14403, Japanese Patent Publication No. 63-241511, and Japanese Patent Publication No. 1-193709. It is proposed in Japanese Patent Publication.
【０００６】これらの各公報ではズームレンズを物体側
より順に負、正、負、そして正の屈折力のレンズ群の全
体として４つのレンズ群より構成し、このうち所定のレ
ンズ群を適切に移動させて変倍を行なっている。In each of these publications, the zoom lens is composed of four lens groups as a whole of a lens group having negative, positive, negative, and positive refractive powers in order from the object side, and a predetermined lens group among them is appropriately moved. I am changing the magnification.
【０００７】この他、特開平２−２０１３１０号公報で
は同様の構成のズームレンズにおいて第１群中の比較的
軽量の一部のレンズ群を光軸上移動させてフォーカスを
行ない、例えばオートフォーカスを行なう際のフォーカ
ス操作を容易にしたズームレンズを提案している。In addition, in Japanese Patent Laid-Open No. 2-201310, in a zoom lens having a similar structure, a relatively light weight part of the first lens group is moved along the optical axis to perform focusing, for example, autofocusing. We have proposed a zoom lens that facilitates focus operation when performing.
【０００８】又、最短撮影距離を短くした、所謂、超近
接撮影（マクロ）を可能としたズームレンズが種々と提
案されている。例えば特開昭５２−６０１３０号公報で
は望遠端においてコンペンセーター（第３群）を物体側
へ移動させて超近接物体の撮影を行なっている。Further, various zoom lenses have been proposed in which the shortest shooting distance is shortened and so-called super close-up shooting (macro) is possible. For example, in Japanese Unexamined Patent Publication No. 52-60130, the compensator (third group) is moved to the object side at the telephoto end to photograph an ultra-close object.
【０００９】又、特開昭６１−２７９８１７号公報では
物体側より順に負、正、負、そして正の屈折力の４つの
レンズ群を有したズームレンズにおいて、第１，第２，
第４群を一体的に物体側へ移動させて超近接物体の撮影
を行なっている。Further, in Japanese Patent Laid-Open No. 61-279817, a zoom lens having four lens groups of negative power, positive power, negative power, and positive power in this order from the object side is used.
The fourth group is integrally moved to the object side to photograph a super close object.
【００１０】[0010]
【発明が解決しようとする課題】近年、一眼レフカメラ
やビデオカメラ等に用いる標準用のズームレンズとして
は広画角を含み、かつ高変倍比のものが要望されてい
る。例えば既に３５ｍｍフィルム用の一眼レフカメラで
は焦点距離３５ｍｍ〜７０ｍｍ程度の広画角のズームレ
ンズが標準用のズームレンズとして用いられいている。In recent years, as a standard zoom lens used in a single-lens reflex camera, a video camera, etc., a zoom lens having a wide angle of view and a high zoom ratio has been demanded. For example, in a single-lens reflex camera for 35 mm film, a zoom lens having a wide angle of view with a focal length of about 35 mm to 70 mm has already been used as a standard zoom lens.
【００１１】又、物体距離が例えば３０ｃｍ程度の超近
接物体の撮影（マクロ撮影）が可能なことが要望されて
いる。しかしながら、広画角のズームレンズにおいて超
近接撮影を行なうと収差変動が大きくなり、光学性能が
大きく低下してくるという問題点がある。There is also a demand for being able to photograph (macro photographing) a super close object having an object distance of, for example, about 30 cm. However, when super close-up photography is performed with a wide-angle zoom lens, there is a problem in that aberration fluctuations increase and optical performance significantly deteriorates.
【００１２】本発明はズームレンズを全体として５つの
レンズ群より構成し、各レンズ群の屈折力や変倍に伴う
各レンズ群の移動条件、そしてフォーカスの際のレンズ
群の移動条件等を適切に設定することによりレンズ全長
を短縮し大口径比で、かつ比較的広画角で全変倍範囲に
わたり高い光学性能を有し、しかも超近接物体の撮影の
際の光学性能を良好に維持したズームレンズの提供を目
的とする。According to the present invention, the zoom lens is composed of five lens groups as a whole, and the refractive power of each lens group, the moving condition of each lens group due to zooming, and the moving condition of the lens group at the time of focusing are appropriate. By shortening the overall length of the lens, the lens has a large aperture ratio, a relatively wide angle of view, and high optical performance over the entire zoom range, while maintaining excellent optical performance when shooting ultra-close-range objects. The purpose is to provide a zoom lens.
【００１３】[0013]
【課題を解決するための手段】本発明のズームレンズ
は、物体側より順に負の屈折力の第１群、負の屈折力の
第２群、正の屈折力の第３群、負の屈折力の第４群そし
て正の屈折力の第５群の５つのレンズ群を有し、各レン
ズ群の空気間隔を変えて変倍を行なうと共に少なくとも
２つのレンズ群を光軸上移動させて超近接物体へのフォ
ーカスを行なっていることを特徴としている。A zoom lens according to the present invention comprises, in order from the object side, a first group having a negative refractive power, a second group having a negative refractive power, a third group having a positive refractive power, and a negative refractive power. It has five lens groups, a fourth lens group of power and a fifth lens group of positive refracting power, and performs zooming by changing the air space of each lens group and moving at least two lens groups on the optical axis to achieve super power. It is characterized by focusing on a near object.
【００１４】[0014]
【実施例】図１，図２は本発明の数値実施例１，２の広
角端（ワイド）におけるレンズ断面図である。1 and 2 are lens cross-sectional views at the wide-angle end (wide) of Numerical Embodiments 1 and 2 of the present invention.
【００１５】図中、Ｌ１は負の屈折力の第１群、Ｌ２は
負の屈折力の第２群、Ｌ３は正の屈折力の第３群、Ｌ４
は負の屈折力の第４群、Ｌ５は正の屈折力の第５群であ
る。ＳＰは絞りである。矢印は広角端から望遠端（テ
レ）への変倍を行なう際の各レンズ群の移動軌跡を示し
ている。In the figure, L1 is the first group having negative refractive power, L2 is the second group having negative refractive power, L3 is the third group having positive refractive power, and L4.
Is a fourth group having a negative refractive power, and L5 is a fifth group having a positive refractive power. SP is a diaphragm. The arrows indicate the movement loci of the respective lens groups when zooming from the wide-angle end to the telephoto end (tele).
【００１６】本実施例では、図に示すように広角端から
望遠端への変倍に際しては第２群と第３群との間隔を減
少させ、第３群と第４群との間隔を増大させ、第４群と
第５群との間隔を減少させるように、第１，第２，第
３，第５群を移動させ、このとき第１群と第２群とを互
いに異なった軌跡で移動させている。In the present embodiment, as shown in the figure, when zooming from the wide-angle end to the telephoto end, the distance between the second lens group and the third lens group is decreased and the distance between the third lens group and the fourth lens group is increased. Then, the first, second, third, and fifth groups are moved so as to reduce the distance between the fourth group and the fifth group, and at this time, the first group and the second group are moved on different loci. It is moving.
【００１７】即ち、第１群を単調に像面側へ、第２群を
像面側に凸状の軌跡を有するように、第３群と第５群を
一体的に物体側へ移動させている。尚、第４群と絞りＳ
Ｐは固定である。That is, the third group and the fifth group are integrally moved to the object side so that the first group monotonously moves to the image plane side and the second group has a convex locus to the image plane side. There is. The fourth lens group and the diaphragm S
P is fixed.
【００１８】そして無限遠物体から至近物体への通常距
離物体でのフォーカスは第２群を移動させて行なってい
る。又、至近距離物体から超近接物体へのフォーカス
は、後述するように少なくとも２つのレンズ群を移動さ
せて行なっている。Focusing on an object at a normal distance from an infinitely distant object to a close object is performed by moving the second group. Focusing from a close-range object to a super-close object is performed by moving at least two lens groups, as will be described later.
【００１９】本発明のズームレンズは広角端において共
に負の屈折力の第１群と第２群に対して正の屈折力の第
３群を光軸上隔てて（遠く離して）配置し、又第３群に
対して負の屈折力の第４群を接近して配置し、更に第４
群に対して正の屈折力の第５群を隔てて配置している。
これによりレンズ系全体がレトロ型のレンズ構成となる
ようにして広画角化を図りつつ所定のバックフォーカス
が容易に得られるようにしている。In the zoom lens of the present invention, at the wide-angle end, the first lens unit and the second lens unit which both have negative refractive power are arranged with the third lens unit having positive refractive power spaced apart (far away from each other) on the optical axis, Further, the fourth lens unit having a negative refractive power is arranged closer to the third lens unit,
A fifth group having a positive refractive power is arranged apart from the group.
As a result, the entire lens system has a retro type lens configuration, and a predetermined back focus can be easily obtained while achieving a wide angle of view.
【００２０】そして広角端から望遠端への変倍に際して
は望遠端において共に負の屈折力の第１群と第２群に対
して正の屈折力の第３群が接近するようにし、第３群と
負の屈折力の第４群との間隔が広くなるようにし、第４
群に対して正の屈折力の第５群が接近するように所定の
レンズ群を移動させて変倍を行なって第１，第２，第３
群で全体として正の屈折力の前群、そして第４，第５群
で全体として負の屈折力の後群のレンズ系全体が望遠型
（テレタイプ）のレンズ構成となるようにしている。At the time of zooming from the wide-angle end to the telephoto end, at the telephoto end, the third lens unit having positive refractive power is brought closer to the first lens unit and the second lens unit having negative refractive power. The distance between the group and the fourth group having negative refracting power should be wide,
The predetermined lens unit is moved so that the fifth lens unit having a positive refracting power approaches the lens unit, and the first, second, and third lens units are changed in magnification.
The entire lens system of the front lens group having a positive refractive power as a whole and the rear lens group of the fourth and fifth lens groups having a negative refractive power as a whole has a telephoto type lens configuration.
【００２１】これにより、各レンズ群に変倍を効果的に
分担させ、変倍の際の各レンズ群の移動量を減少させ
て、所定の変倍比を確保しつつレンズ系全体の小型化を
図っている。Thus, each lens group can be effectively assigned to zooming, the amount of movement of each lens group at the time of zooming can be reduced, and a predetermined zooming ratio can be secured while the overall size of the lens system is reduced. I am trying to
【００２２】絞りＳＰは第４群の像面側に固定し、望遠
側で正の屈折力の前群（第１，第２，第３群の合成）か
ら遠ざけて、軸上光束径が小さくなるようにして絞り径
の増大を防止している。The stop SP is fixed to the image plane side of the fourth lens unit, and is separated from the front lens unit (composition of the first, second and third lens units) having positive refracting power on the telephoto side to reduce the axial light beam diameter. As a result, the aperture diameter is prevented from increasing.
【００２３】又変倍に際して第１群を単調移動させるよ
うにして、例えばカメラ本体に装着した状態でレンズ先
端にレンズ側からカメラ本体側に向かう衝撃を受けた場
合でも、第１群がカム溝に沿って退避するようにして衝
撃を吸収し、カム溝の破壊を防止するようにしている。Further, when the first group is monotonously moved during zooming, for example, even when the lens tip is subjected to a shock from the lens side toward the camera body side in a state where it is mounted on the camera body, the first group moves in the cam groove. The cam groove is prevented from being destroyed by absorbing the impact by retracting along the line.
【００２４】本実施例では無限遠物体から至近距離物体
（０．７ｍ）に至る通常距離物体のときは第２群を移動
させてフォーカスを行なっている。数値実施例１，２に
おけるこのときの物体距離とレンズ繰出量、そして撮影
倍率との関係を各々表−１，表−５に示す。尚、レンズ
繰出量の符号は物体側から像面側へ移動するときを正と
している。In the present embodiment, when the object is a normal distance object from an object at infinity to an object at a close range (0.7 m), the second group is moved for focusing. Tables 1 and 5 show the relationship between the object distance, the lens extension amount, and the photographing magnification in Numerical Examples 1 and 2 at this time. The sign of the amount of lens extension is positive when moving from the object side to the image plane side.
【００２５】次に、至近距離物体（０．７ｍ）から超近
接物体（０．３ｍ）へのフォーカスについて説明する。Next, focusing from an object at a close range (0.7 m) to an extremely close object (0.3 m) will be described.
【００２６】超近接物体へのフォーカスの際には、全系
が広角端のズーム位置にくるようにする。そしてこの状
態からフォーカスレンズ群（第２群）を含む、又はフォ
ーカスレンズ群以外の少なくとも２つのレンズ群を移動
させて行なっている。即ち、本発明では所謂ワイドマク
ロと呼ばれている方法を利用している。When focusing on a super-close object, the entire system is set to the zoom position at the wide-angle end. Then, from this state, at least two lens groups including the focus lens group (second group) or other than the focus lens group are moved. That is, the present invention utilizes a method called a so-called wide macro.
【００２７】次に、各数値実施例においける超近接物体
へのフォーカス方法（ワイドマクロ）について説明す
る。Next, a focusing method (wide macro) for an ultra-close object in each numerical example will be described.
【００２８】（１）数値実施例１ (1-1) ワイドマクロ−１ 第２群を単独で、第３群と第５群とを一体的に物体側へ
移動させる。このときの物体距離、レンズ繰出量、撮影
倍率との関係を表−２に示す。第３群と第４群の敏感度
（レンズ群の移動量に対するピント面の移動量の比）は
双方共に正であり、特に第３群の敏感度は大きい為に超
近接物体へのフォーカスの為のレンズ繰出量を少なくす
ることができる。又、変倍用のレンズ空間を用いて超近
接物体へのフォーカスを行なっている為にレンズ空間を
新たに設ける必要がなく、レンズ系全体の小型化に有利
になっている。このときの収差を図５に示す。(1) Numerical Embodiment 1 (1-1) Wide Macro-1 The second group is independently moved to move the third group and the fifth group integrally to the object side. Table 2 shows the relationship among the object distance, the lens extension amount, and the photographing magnification at this time. The sensitivities of the third group and the fourth group (the ratio of the amount of movement of the focusing surface to the amount of movement of the lens group) are both positive, and since the sensitivity of the third group is particularly large, focusing on an ultra-close object is difficult. Therefore, the amount of lens extension can be reduced. In addition, since the ultra-close object is focused using the lens space for zooming, it is not necessary to newly provide a lens space, which is advantageous for downsizing the entire lens system. The aberration at this time is shown in FIG.
【００２９】(1-2) ワイドマクロ−２ 第１，第２群を各々独立に、第３群と第５群を一体的に
物体側へ移動させる。このときの物体距離、レンズ繰出
量、撮影倍率との関係を表−３に示す。第１群の敏感度
は正である為、ワイドマクロ−１に比べて更に少ないレ
ンズ繰出量で超近接物体へのフォーカスが可能となって
いる。このときの収差を図６に示す。(1-2) Wide macro-2 The first and second groups are independently moved, and the third group and the fifth group are integrally moved to the object side. Table 3 shows the relationship among the object distance, the lens extension amount, and the photographing magnification at this time. Since the sensitivity of the first lens group is positive, it is possible to focus on an ultra-close object with a lens extension amount smaller than that of the wide macro-1. The aberration at this time is shown in FIG.
【００３０】(1-3) ワイドマクロ−３ 第１，第２群を各々独立に、第３群と第５群とを一体的
に物体側へ、又第４群を像面側へ移動させる。このとき
の物体距離、レンズ繰出量、撮影倍率との関係を表−４
に示す。第４群の敏感度が負であるので像面側へ移動さ
せており、これにより超近接物体へのフォーカスの際の
各レンズ群の繰出量を少なくしている。このときの収差
を図７に示す。(1-3) Wide macro-3: The first and second groups are independently moved, the third group and the fifth group are integrally moved to the object side, and the fourth group is moved to the image plane side. . Table 4 shows the relationship between the object distance, lens extension, and shooting magnification at this time.
Shown in. Since the sensitivity of the fourth group is negative, it is moved toward the image plane side, thereby reducing the amount of extension of each lens group when focusing on an ultra-close object. The aberration at this time is shown in FIG.
【００３１】（２）数値実施例２ (2-1) ワイドマクロ−４ 第２，第３，第５群を各々独立に異なった量だけ物体側
に移動させる。このときの物体距離、レンズ繰出量、撮
影倍率との関係を表−６に示す。第３群と第５群の移動
量を変えることにより、像面の補正を容易にし良好なる
光学性能を得ている。このときの収差を図１０に示す。(2) Numerical Embodiment 2 (2-1) Wide Macro-4 The second, third and fifth groups are independently moved by different amounts to the object side. Table 6 shows the relationship among the object distance, the lens extension amount, and the photographing magnification at this time. By changing the amount of movement of the third and fifth groups, it is possible to easily correct the image plane and obtain good optical performance. The aberration at this time is shown in FIG.
【００３２】尚、本発明においてレンズ系全体の小型化
を図りつつ所定の変倍比を確保し、全変倍範囲にわたり
収差変動が少なく、高い光学性能を得るには次の条件を
満足させるのが良い。In the present invention, the following conditions must be satisfied in order to obtain a small zoom ratio of the entire lens system, a predetermined zoom ratio, a small aberration variation over the entire zoom range, and high optical performance. Is good.
【００３３】前記第ｉ群の焦点距離をｆｉ、望遠端にお
ける全系の焦点距離をｆＴとしたとき １．０ ＜｜ｆ２｜／ｆＴ＜２．５ ・・・・・・（１） ０．３ ＜ｆ１／ｆ２ ＜３．０ ・・・・・・（２） ０．２８＜ｆ３／ｆＴ ＜０．８５ ・・・・・（３） なる条件を満足することである。When the focal length of the i-th group is fi and the focal length of the entire system at the telephoto end is fT, 1.0 <| f2 | / fT <2.5 (1) 0. 3 <f1 / f2 <3.0 (2) 0.28 <f3 / fT <0.85 (3) The condition is satisfied.
【００３４】条件式（１）は望遠端における全系の焦点
距離に対する第２群の焦点距離の比を規定するものであ
る。条件式（１）の上限値を越えて第２群の負の屈折力
が弱くなり過ぎると、第２群で通常距離物体でのフォー
カスを行なう際の移動量が増大し、この為のスペースを
第１群と第２群との間に多く確保する必要があり、レン
ズ全長が増大し更に広角側における軸外光束を確保する
為に第１群のレンズ外径が大きくなってしまう。又、下
限値を越えて第２群の負の屈折力が強くなり過ぎると、
これに伴って他のレンズ群の屈折力も強める必要があ
り、レンズ系のコンパクト化には有利であるが、各レン
ズ群で発生する収差が増大し、これをバランス良く補正
することが困難となる。Conditional expression (1) defines the ratio of the focal length of the second lens group to the focal length of the entire system at the telephoto end. If the negative refracting power of the second lens unit becomes too weak beyond the upper limit of conditional expression (1), the movement amount of the second lens unit when focusing on an object at a normal distance increases, and space for this is increased. It is necessary to secure a large number between the first group and the second group, and the overall lens length increases, and the lens outer diameter of the first group becomes large in order to secure an off-axis light beam on the wide angle side. If the lower limit is exceeded and the negative refractive power of the second lens unit becomes too strong,
Along with this, it is necessary to strengthen the refracting power of the other lens groups, which is advantageous for making the lens system compact, but the aberrations that occur in each lens group increase, making it difficult to correct this in a well-balanced manner. .
【００３５】条件式（２）は条件式（１）のもとで第２
群の焦点距離と第１群の焦点距離との比を規定するもの
である。条件式（２）の上限値を越えて第１群の負の屈
折力が弱くなり過ぎると、広角側における軸外光束を確
保する為に第１群のレンズ外径が増大してしまう。又、
下限値を越えて第１群の負の屈折力が強くなり過ぎる
と、第１群のレンズ外径のコンパクト化には有利である
がバックフォーカスが必要以上に伸びるか、これを防止
する為には第３群の屈折力も強くしなければならない為
に諸収差の補正が悪化してしまう。Conditional expression (2) is based on conditional expression (1).
It defines the ratio of the focal length of the group and the focal length of the first group. If the negative refractive power of the first group becomes too weak beyond the upper limit of conditional expression (2), the lens outer diameter of the first group increases in order to secure the off-axis light flux on the wide angle side. or,
If the negative refracting power of the first lens group becomes too strong beyond the lower limit, it is advantageous for making the outer diameter of the lens of the first lens group compact, but the back focus is extended more than necessary or in order to prevent this. Must also increase the refracting power of the third lens group, so that the correction of various aberrations deteriorates.
【００３６】条件式（３）は望遠端における全系の焦点
距離に対する第３群の焦点距離の比を規定するものであ
る。上限値を越えて第３群の正の屈折力が弱くなり過ぎ
ると、収差補正には有利な方向であるが、所定の変倍比
を得る為の各レンズ群の移動量が増大すると共に必要以
上にバックフォーカスが長くなりレンズ全長及びレンズ
外径が増大する。又、下限値を越えて第３群の正の屈折
力が強くなり過ぎるとコンパクト化には有利であるが、
第３群で発生する諸収差が増大し、これをバランス良く
補正することが困難となる。Conditional expression (3) defines the ratio of the focal length of the third lens group to the focal length of the entire system at the telephoto end. If the positive refractive power of the third lens unit becomes too weak beyond the upper limit, it is advantageous for aberration correction, but it is necessary as the amount of movement of each lens unit increases in order to obtain a predetermined zoom ratio. As described above, the back focus becomes longer and the total lens length and lens outer diameter increase. Further, if the lower limit is exceeded and the positive refractive power of the third lens unit becomes too strong, it is advantageous for compactness.
Aberrations that occur in the third lens group increase, and it becomes difficult to correct these aberrations in a well-balanced manner.
【００３７】尚、本発明のズームレンズでは第１群に像
面側に強い屈折力の凹面を向けたメニスカス状の負レン
ズを有するように構成している。これにより軸外光束を
徐々に屈折させて広角端においてレンズ系全体のレトロ
型化を容易にし、広画角化を図ったときに発生する広角
側での負の歪曲収差を良好に補正している。In the zoom lens according to the present invention, the first lens group is provided with a negative meniscus lens having a concave surface having a strong refractive power facing the image side. As a result, the off-axis light beam is gradually refracted to facilitate retro-type conversion of the entire lens system at the wide-angle end, and the negative distortion aberration on the wide-angle side that occurs when widening the angle of view is satisfactorily corrected. There is.
【００３８】又、前記第２群は像面側に凹面を向けた負
の第２１レンズと物体側に凸面を向けた正の第２２レン
ズとを有し、第３群は負レンズと正レンズの貼合わせレ
ンズ、両レンズ面が凸面の正レンズ、そして正レンズと
負レンズの貼合わせレンズとを有し、第４群は正レンズ
と負レンズの貼合わせレンズ、そして両レンズ面が凹面
の負レンズとを有し、第５群は２つの正レンズと像面側
に凸面を向けたメニスカス状の負レンズとを有するよう
にし、これによりレンズ全長の短縮化及び広画角化を図
りつつ全変倍範囲にわたり収差変動が少なく高い光学性
能を得ている。The second group includes a negative 21st lens having a concave surface facing the image side and a positive 22nd lens having a convex surface facing the object side. The third group includes a negative lens and a positive lens. Of the positive lens and the negative lens, and the fourth lens group has a positive lens and a negative lens, and both lens surfaces are concave. The fifth lens group has a negative lens, and the fifth lens group has two positive lenses and a meniscus-shaped negative lens having a convex surface facing the image plane side, thereby shortening the total lens length and widening the angle of view. High optical performance with little aberration variation over the entire zoom range.
【００３９】[0039]
【表１】 [Table 1]
【００４０】[0040]
【表２】 [Table 2]
【００４１】[0041]
【表３】 [Table 3]
【００４２】[0042]
【表４】 [Table 4]
【００４３】[0043]
【表５】 [Table 5]
【００４４】[0044]
【表６】 次に本発明の数値実施例を示す。数値実施例においてＲ
ｉは物体側より順に第ｉ番目のレンズ面の曲率半径、Ｄ
ｉは物体側より第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番目のレンズのガラス
の屈折率とアッベ数である。[Table 6] Next, numerical examples of the present invention will be shown. R in numerical examples
i is the radius of curvature of the i-th lens surface in order from the object side, D
i is the i-th lens thickness from the object side and the air gap, Ni
And νi are the refractive index and Abbe number of the glass of the i-th lens in order from the object side.
【００４５】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−７に示す。Table 7 shows the relationship between the above-mentioned conditional expressions and various numerical values in the numerical examples.
【００４６】非球面形状は光軸方向にＸ軸、光軸と垂直
方向にＨ軸、光の進行方向を正としＲを近軸曲率半径
Ａ，Ｂ，Ｃ，Ｄ，Ｅを各々非球面係数としたときThe aspherical shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the traveling direction of light is positive, and R is the paraxial radius of curvature A, B, C, D, and E, respectively. When
【００４７】[0047]
【数１】 なる式で表わしている。 （数値実施例１） F= 28.8 〜 68.2 FNO= 1:2.89 2ω= 73.8°〜 35.2° R 1= 110.00（非球面）D 1= 2.90 N 1=1.71300 ν 1= 53.8 R 2= 33.85 D 2= 可変 R 3= -270.10 D 3= 2.50 N 2=1.77250 ν 2= 49.6 R 4= 43.44 D 4= 0.15 R 5= 42.97 D 5= 5.50 N 3=1.84666 ν 3= 23.8 R 6= 128.00 D 6= 可変 R 7= 89.81 D 7= 1.90 N 4=1.84666 ν 4= 23.8 R 8= 37.81 D 8= 5.80 N 5=1.55963 ν 5= 61.2 R 9=-4219.94 D 9= 0.15 R10= 69.74 D10= 6.10 N 6=1.65160 ν 6= 58.5 R11= -93.29 D11= 0.15 R12= 37.97 D12= 5.80 N 7=1.65160 ν 7= 58.5 R13=-1979.51 D13= 1.80 N 8=1.84666 ν 8= 23.8 R14= 148.05 D14= 可変 R15= 167.33 D15= 3.10 N 9=1.84666 ν 9= 23.8 R16= -62.23 D16= 1.40 N10=1.77250 ν10= 49.6 R17= 61.07 D17= 2.60 R18= -56.31 D18= 1.40 N11=1.51633 ν11= 64.2 R19= 43.71 D19= 2.50 R20=（絞り） D20= 可変 R21= 162.82 D21= 4.80 N12=1.48749 ν12= 70.2 R22= -33.41 D22= 0.15 R23= 125.32 D23= 4.00 N13=1.55963 ν13= 61.2 R24= -43.24 D24= 1.96 R25= -30.78 D25= 1.40 N14=1.84666 ν14= 23.8 R26= -70.69[Equation 1] It is expressed by (Numerical Example 1) F = 28.8 to 68.2 FNO = 1: 2.89 2ω = 73.8 ° to 35.2 ° R 1 = 110.00 (aspherical surface) D 1 = 2.90 N 1 = 1.71300 ν 1 = 53.8 R 2 = 33.85 D 2 = Variable R 3 = -270.10 D 3 = 2.50 N 2 = 1.77250 ν 2 = 49.6 R 4 = 43.44 D 4 = 0.15 R 5 = 42.97 D 5 = 5.50 N 3 = 1.84666 ν 3 = 23.8 R 6 = 128.00 D 6 = variable R 7 = 89.81 D 7 = 1.90 N 4 = 1.84666 ν 4 = 23.8 R 8 = 37.81 D 8 = 5.80 N 5 = 1.55963 ν 5 = 61.2 R 9 = -4219.94 D 9 = 0.15 R10 = 69.74 D10 = 6.10 N 6 = 1.65160 ν 6 = 58.5 R11 = -93.29 D11 = 0.15 R12 = 37.97 D12 = 5.80 N 7 = 1.65160 ν 7 = 58.5 R13 = -1979.51 D13 = 1.80 N 8 = 1.84666 ν 8 = 23.8 R14 = 148.05 D14 = variable R15 = 167.33 D15 = 3.10 N 9 = 1.84666 ν 9 = 23.8 R16 = -62.23 D16 = 1.40 N10 = 1.77250 ν10 = 49.6 R17 = 61.07 D17 = 2.60 R18 = -56.31 D18 = 1.40 N11 = 1.51633 ν11 = 64.2 R19 = 43.71 D19 = 2.50 R20 = (Aperture) D20 = Variable R21 = 162.82 D21 = 4.80 N12 = 1.48749 ν12 = 70.2 R22 = -33.41 D22 = 0.15 R23 = 125.32 D23 = 4.00 N13 = 1.55963 ν13 = 61.2 R24 = -43.24 D24 = 1.96 R25 = -30.78 D25 = 1.40 N14 = 1.84666 ν14 = 23.8 R26 = -70.69
【００４８】[0048]
【表７】 非球面係数 B = 9.95583 × 10-7 C = 1.20218 × 10-10 D =-2.3265 × 10-13 E = 1.26457 × 10-16 （数値実施例２） F= 28.8 〜 67.8 FNO= 1:2.89 2ω= 73.8°〜 35.4° R 1= 110.00（非球面）D 1= 2.90 N 1=1.71300 ν 1= 53.8 R 2= 34.59 D 2= 可変 R 3= -230.05 D 3= 2.50 N 2=1.77250 ν 2= 49.6 R 4= 43.60 D 4= 0.15 R 5= 42.77 D 5= 5.50 N 3=1.84666 ν 3= 23.8 R 6= 129.92 D 6= 可変 R 7= 81.26 D 7= 1.90 N 4=1.84666 ν 4= 23.8 R 8= 37.76 D 8= 5.80 N 5=1.55963 ν 5= 61.2 R 9=-2603.16 D 9= 0.15 R10= 76.39 D10= 6.10 N 6=1.65160 ν 6= 58.5 R11= -84.57 D11= 0.15 R12= 38.27 D12= 5.80 N 7=1.65160 ν 7= 58.5 R13=-1289.81 D13= 1.80 N 8=1.84666 ν 8= 23.8 R14= 129.19 D14= 可変 R15= 146.96 D15= 3.10 N 9=1.84666 ν 9= 23.8 R16= -65.06 D16= 1.40 N10=1.77250 ν10= 49.6 R17= 51.80 D17= 2.60 R18= -39.37 D18= 1.40 N11=1.51633 ν11= 64.2 R19= 70.21 D19= 2.50 R20=（絞り） D20= 可変 R21= 560.55 D21= 4.80 N12=1.48749 ν12= 70.2 R22= -29.29 D22= 0.15 R23= 102.21 D23= 4.00 N13=1.48749 ν13= 70.2 R24= -37.66 D24= 2.18 R25= -27.18 D25= 1.40 N14=1.80518 ν14= 25.4 R26= -55.64[Table 7] Aspherical coefficient B = 9.95583 × 10 -7 C = 1.20218 × 10 -10 D = -2.3265 × 10 -13 E = 1.26457 × 10 -16 (Numerical example 2) F = 28.8 to 67.8 FNO = 1: 2.89 2ω = 73.8 ° ~ 35.4 ° R 1 = 110.00 (aspheric) D 1 = 2.90 N 1 = 1.71300 ν 1 = 53.8 R 2 = 34.59 D 2 = variable R 3 = -230.05 D 3 = 2.50 N 2 = 1.77250 ν 2 = 49.6 R 4 = 43.60 D 4 = 0.15 R 5 = 42.77 D 5 = 5.50 N 3 = 1.84666 ν 3 = 23.8 R 6 = 129.92 D 6 = Variable R 7 = 81.26 D 7 = 1.90 N 4 = 1.84666 ν 4 = 23.8 R 8 = 37.76 D 8 = 5.80 N 5 = 1.55963 ν 5 = 61.2 R 9 = -2603.16 D 9 = 0.15 R10 = 76.39 D10 = 6.10 N 6 = 1.65160 ν 6 = 58.5 R11 = -84.57 D11 = 0.15 R12 = 38.27 D12 = 5.80 N 7 = 1.65160 ν 7 = 58.5 R13 = -1289.81 D13 = 1.80 N 8 = 1.84666 ν 8 = 23.8 R14 = 129.19 D14 = Variable R15 = 146.96 D15 = 3.10 N 9 = 1.84666 ν 9 = 23.8 R16 = -65.06 D16 = 1.40 N10 = 1.77250 ν10 = 49.6 R17 = 51.80 D17 = 2.60 R18 = -39.37 D18 = 1.40 N11 = 1.51633 ν11 = 64.2 R19 = 70.21 D19 = 2.50 R20 = (Aperture) D20 = Variable R21 = 560.55 D21 = 4.80 N12 = 1.48749 ν12 = 70.2 R22 = -29.29 D22 = 0.15 R23 = 102.21 D23 = 4.00 N13 = 1.48749 ν13 = 7 0.2 R24 = -37.66 D24 = 2.18 R25 = -27.18 D25 = 1.40 N14 = 1.80518 ν14 = 25.4 R26 = -55.64
【００４９】[0049]
【表８】 非球面係数 B = 8.67121 × 10-7 C =-3.71234 × 10-11 D = 8.60396 × 10-14 E =-6.49703 × 10-17 [Table 8] Aspheric coefficient B = 8.67121 × 10 -7 C = -3.71234 × 10 -11 D = 8.60396 × 10 -14 E = -6.49703 × 10 -17
【００５０】[0050]
【表９】 [Table 9]
【００５１】[0051]
【発明の効果】本発明によれば以上のように、ズームレ
ンズを全体として５つのレンズ群より構成し、各レンズ
群の屈折力や変倍に伴う各レンズ群の移動条件、そして
フォーカスの際のレンズ群の移動条件等を適切に設定す
ることによりレンズ全長を短縮し大口径比で、かつ比較
的広画角で全変倍範囲にわたり高い光学性能を有し、し
かも超近接物体の撮影の際の光学性能を良好に維持した
ズームレンズを達成している。As described above, according to the present invention, the zoom lens is composed of the five lens groups as a whole, and the refractive power of each lens group, the moving condition of each lens group due to zooming, and the focus By appropriately setting the moving conditions of the lens group, the total lens length is shortened, the large aperture ratio is achieved, and the lens has a relatively wide angle of view and high optical performance over the entire zoom range. We have achieved a zoom lens that maintains good optical performance.
【図１】 本発明の数値実施例１の広角端におけるレ
ンズ断面図FIG. 1 is a lens cross-sectional view at a wide-angle end according to Numerical Example 1 of the present invention.
【図２】 本発明の数値実施例２の広角端におけるレ
ンズ断面図FIG. 2 is a lens cross-sectional view at a wide-angle end according to Numerical Example 2 of the present invention.
【図３】 本発明の数値実施例１の広角端の無限遠物
体での収差図FIG. 3 is an aberration diagram of an object at infinity at the wide-angle end according to Numerical Example 1 of the present invention.
【図４】 本発明の数値実施例１の望遠端の無限遠物
体での収差図FIG. 4 is an aberration diagram of an object at infinity at the telephoto end according to Numerical Example 1 of the present invention.
【図５】 本発明の数値実施例１のワイドマクロ−１
の収差図FIG. 5: Wide macro-1 of numerical embodiment 1 of the present invention
Aberration diagram
【図６】 本発明の数値実施例１のワイドマクロ−２
の収差図FIG. 6 is a wide macro-2 of Numerical Embodiment 1 of the present invention.
Aberration diagram
【図７】 本発明の数値実施例１のワイドマクロ−３
の収差図FIG. 7: Wide macro-3 according to numerical embodiment 1 of the present invention
Aberration diagram
【図８】 本発明の数値実施例２の広角端の無限遠物
体での収差図FIG. 8 is an aberration diagram of an object at infinity at the wide-angle end according to Numerical Example 2 of the present invention.
【図９】 本発明の数値実施例２の望遠端の無限遠物
体での収差図FIG. 9 is an aberration diagram of an object at infinity at the telephoto end according to Numerical Example 2 of the present invention.
【図１０】 本発明の数値実施例２のワイドマクロ−４
の収差図FIG. 10 is a wide macro-4 according to Numerical Embodiment 2 of the present invention.
Aberration diagram
Ｌ１ 第１群 Ｌ２ 第２群 Ｌ３ 第３群 Ｌ４ 第４群 Ｌ５ 第５群 ＳＰ 絞り ｄ ｄ線 ｇ ｇ線 Ｓ．Ｃ 正弦条件 ΔＳ サジタル像面 ΔＭ メリディオナル像面 L1 1st group L2 2nd group L3 3rd group L4 4th group L5 5th group SP diaphragm d d line g g line S.L. C Sine condition ΔS Sagittal image plane ΔM Meridional image plane
Claims (7)
の屈折力の第２群、正の屈折力の第３群、負の屈折力の
第４群そして正の屈折力の第５群の５つのレンズ群を有
し、各レンズ群の空気間隔を変えて変倍を行なうと共に
少なくとも２つのレンズ群を光軸上移動させて超近接物
体へのフォーカスを行なっていることを特徴とするズー
ムレンズ。1. A first group of negative refracting power, a second group of negative refracting power, a third group of positive refracting power, a fourth group of negative refracting power, and a positive refracting power It has five lens groups of the fifth group, and changes the air space of each lens group to perform zooming, and at least two lens groups are moved on the optical axis to focus on a super close object. The featured zoom lens.
体から至近物体へのフォーカスを行なっていることを特
徴とする請求項１のズームレンズ。2. The zoom lens according to claim 1, wherein the second lens unit is moved along the optical axis to focus from an object at infinity to a near object.
と第５群を物体側へ移動させて行なっていることを特徴
とする請求項２のズームレンズ。3. The zoom lens according to claim 2, wherein focusing on an ultra-close object is performed by moving the third group and the fifth group toward the object side.
と第３群そして第５群を物体側へ移動させて行なってい
ることを特徴とする請求項２のズームレンズ。4. The zoom lens according to claim 2, wherein focusing on an ultra-close object is performed by moving the first, third, and fifth groups toward the object side.
と第３群そして第５群を物体側へ、前記第４群を像面側
へ移動させて行なっていることを特徴とする請求項２の
ズームレンズ。5. An ultra-close object is focused by moving the first group, the third group, and the fifth group to the object side and moving the fourth group to the image plane side. Item 2 zoom lens.
２群と第３群との間隔を減少させ、該第３群と第４群と
の間隔を増大させ、該第４群と第５群との間隔を減少さ
せるように少なくとも該第１，第２，第３，第５群を移
動させると共に該第１群と第２群とを異なった軌跡で移
動させたことを特徴とする請求項１のズームレンズ。6. The distance between the second lens unit and the third lens unit is reduced and the distance between the third lens unit and the fourth lens unit is increased during zooming from the wide-angle end to the telephoto end, thereby increasing the distance between the fourth lens unit and the fourth lens unit. At least the first, second, third, and fifth groups are moved so as to reduce the distance from the fifth group, and the first group and the second group are moved on different trajectories. The zoom lens according to claim 1.
おける全系の焦点距離をｆＴとしたとき １．０ ＜｜ｆ２｜／ｆＴ＜２．５ ０．３ ＜ｆ１／ｆ２ ＜３．０ ０．２８＜ｆ３／ｆＴ ＜０．８５ なる条件を満足することを特徴とする請求項１のズーム
レンズ。7. When the focal length of the i-th group is fi and the focal length of the entire system at the telephoto end is fT, 1.0 <| f2 | / fT <2.5 0.3 <f1 / f2 <3 The zoom lens according to claim 1, wherein a condition of 0.0 0.28 <f3 / fT <0.85 is satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11410593A JP3144153B2 (en) | 1993-04-16 | 1993-04-16 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11410593A JP3144153B2 (en) | 1993-04-16 | 1993-04-16 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06308389A true JPH06308389A (en) | 1994-11-04 |
| JP3144153B2 JP3144153B2 (en) | 2001-03-12 |
Family
ID=14629250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11410593A Expired - Fee Related JP3144153B2 (en) | 1993-04-16 | 1993-04-16 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3144153B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001311872A (en) * | 2000-04-27 | 2001-11-09 | Nitto Kogaku Kk | Zoom lens for projection and projector device |
| JP2007155887A (en) * | 2005-12-01 | 2007-06-21 | Fujinon Corp | Objective for endoscope |
| JP2009169051A (en) * | 2008-01-16 | 2009-07-30 | Canon Inc | Zoom lens and imaging apparatus having the same |
| JP2010211056A (en) * | 2009-03-11 | 2010-09-24 | Sigma Corp | Inner zoom type and inner focus type zoom lens |
| JP2011002817A (en) * | 2009-05-19 | 2011-01-06 | Konica Minolta Opto Inc | Variable magnification optical system, image capturing device and digital apparatus |
| US8576493B2 (en) | 2010-07-12 | 2013-11-05 | Panasonic Corporation | Zoom lens system, interchangeable lens apparatus and camera system |
| JP2014089365A (en) * | 2012-10-31 | 2014-05-15 | Sigma Corp | Optical system |
| JPWO2021039696A1 (en) * | 2019-08-29 | 2021-03-04 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8503102B2 (en) | 2011-04-19 | 2013-08-06 | Panavision International, L.P. | Wide angle zoom lens |
| US9915332B1 (en) | 2016-10-26 | 2018-03-13 | Schaeffler Technologies AG & Co. KG | Motor vehicle clutch assembly including shock absorber for smoothing clutch engagement |
| KR102634120B1 (en) | 2021-06-09 | 2024-02-06 | (주)유엔아이테크 | Showcase having anitbibration function |
-
1993
- 1993-04-16 JP JP11410593A patent/JP3144153B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001311872A (en) * | 2000-04-27 | 2001-11-09 | Nitto Kogaku Kk | Zoom lens for projection and projector device |
| JP4616966B2 (en) * | 2000-04-27 | 2011-01-19 | 日東光学株式会社 | Projection zoom lens and projector apparatus |
| JP2007155887A (en) * | 2005-12-01 | 2007-06-21 | Fujinon Corp | Objective for endoscope |
| JP2009169051A (en) * | 2008-01-16 | 2009-07-30 | Canon Inc | Zoom lens and imaging apparatus having the same |
| JP2010211056A (en) * | 2009-03-11 | 2010-09-24 | Sigma Corp | Inner zoom type and inner focus type zoom lens |
| JP2011002817A (en) * | 2009-05-19 | 2011-01-06 | Konica Minolta Opto Inc | Variable magnification optical system, image capturing device and digital apparatus |
| US8576493B2 (en) | 2010-07-12 | 2013-11-05 | Panasonic Corporation | Zoom lens system, interchangeable lens apparatus and camera system |
| JP2014089365A (en) * | 2012-10-31 | 2014-05-15 | Sigma Corp | Optical system |
| JPWO2021039696A1 (en) * | 2019-08-29 | 2021-03-04 | ||
| WO2021039696A1 (en) * | 2019-08-29 | 2021-03-04 | 株式会社ニコン | Variable-power optical system, optical device, and method for manufacturing variable-power optical system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3144153B2 (en) | 2001-03-12 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |