JPH10186234A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPH10186234A JPH10186234A JP35627296A JP35627296A JPH10186234A JP H10186234 A JPH10186234 A JP H10186234A JP 35627296 A JP35627296 A JP 35627296A JP 35627296 A JP35627296 A JP 35627296A JP H10186234 A JPH10186234 A JP H10186234A
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- Prior art keywords
- lens
- group
- refractive power
- unit
- zoom
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は一眼レフカメラ等に
用いるズームレンズに関し、特に広画角域から中望遠域
までの焦点距離領域を包含する平倍比５倍程度の全体と
して６つのレンズ群を有した３５ｍｍフィルムカメラ、
ビデオカメラそして電子スチルカメラ等に好適なズーム
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 used for a single-lens reflex camera and the like, and more particularly, to a total of six lens groups having an aspect ratio of about 5 including a focal length region from a wide angle of view region to a middle telephoto region. 35mm film camera with
The present invention relates to a zoom lens suitable for a video camera, an electronic still camera, and the like.
【０００２】[0002]
【従来の技術】従来より写真用カメラやビデオカメラ等
には高変倍で高い光学性能を有したズームレンズが要求
されている。このうち撮影画面の対角長と略等しくなる
焦点距離を挟んで変倍を行う所謂標準ズームレンズが数
多く提案されている。標準ズームレンズのズームタイプ
として変倍を行う為のレンズ群の構成を着目すると、２
群構成から３，４，５群構成と様々なものがある。2. Description of the Related Art Conventionally, a zoom lens having a high zoom ratio and high optical performance has been required for a photographic camera, a video camera and the like. Among them, many so-called standard zoom lenses that perform zooming with a focal length substantially equal to the diagonal length of the shooting screen being proposed have been proposed. Focusing on the configuration of the lens group for zooming as a zoom type of the standard zoom lens, 2
There are various types from the group configuration to the 3, 4, and 5 group configurations.
【０００３】これらのうち、２群構成或いは３群構成の
ズームレンズは、レンズ系の小型化には向くものの、高
い変倍比を実現するのが困難である。又４群構成のズー
ムレンズは高い光学性能を維持しながら高い変倍比を実
現するのに有利であるが、各レンズ群の移動量を十分に
大きくすることやレンズ枚数をある程度多くすることが
必要となってくる。[0003] Of these, a zoom lens having a two-group configuration or a three-group configuration is suitable for downsizing the lens system, but it is difficult to realize a high zoom ratio. A four-group zoom lens is advantageous for realizing a high zoom ratio while maintaining high optical performance. However, it is necessary to make the movement amount of each lens group sufficiently large and to increase the number of lenses to some extent. It becomes necessary.
【０００４】又５群構成のズームレンズは広画角域から
中望遠域までの焦点距離領域を包含しつつ、高い変倍比
を持ち、かつコンパクトな構成で高い光学性能が比較的
容易に得られる。このような５つのレンズ群より成る５
群構成のズームレンズが、例えば特開昭６３−１８９８
１９号公報や特開昭６０−３９６１３号公報等で提案さ
れている。５群ズームレンズでは、変倍に伴う移動レン
ズ群の数を増加させて各レンズ群の間隔を適宜変化させ
ており、これによって変倍の際に発生する諸収差の補正
を容易として高変倍化を実現している。A zoom lens having a five-group configuration has a high zoom ratio and a high optical performance in a compact configuration relatively easily while covering a focal length range from a wide angle of view to a middle telephoto range. Can be 5 comprising such five lens groups
A zoom lens having a group structure is disclosed in, for example, Japanese Patent Application Laid-Open No. 63-1898.
No. 19 and Japanese Patent Application Laid-Open No. 60-39613. In the five-unit zoom lens, the number of moving lens units is increased as the magnification changes, and the distance between the lens units is changed as appropriate. As a result, it is possible to easily correct various aberrations that occur at the time of zooming and to achieve a high zoom ratio. Has been realized.
【０００５】特開昭６３−１８９８１９号公報では、物
体側から順に正の屈折力を有する第１群、負の屈折力を
有する第２群、正の屈折力を有する第３群、正の屈折力
を有する第４群、そして負の屈折力を有する第５群の全
体として５群構成とすることによって、主として変倍比
が４倍弱程度のズームレンズを提案している。Japanese Patent Application Laid-Open No. 63-189819 discloses a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a positive refractive power. A zoom lens having a zoom ratio of about four times or less is proposed by making the fourth group having a power and the fifth group having a negative refractive power into a total of five groups.
【０００６】特開昭６０−３９６１３号公報では、物体
側から順に正の屈折力を有する第１群、負の屈折力を有
する第２群、正の屈折力を有する第３群、負の屈折力を
有する第４群、そして正の屈折力を有する第５群の全体
として５群構成とすることによって、主として変倍比が
５倍弱程度のズームレンズを提案している。In Japanese Patent Application Laid-Open No. 60-39613, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a negative refractive power are described in order from the object side. A zoom lens having a zoom ratio of less than about 5 times has been proposed by making the fourth group having power and the fifth group having positive refractive power as a whole a five-group configuration.
【０００７】[0007]
【発明が解決しようとする課題】特開昭６３−１８９８
１９号公報ではコンパクトなレンズ構成で約４倍弱程度
の高い変倍比を持ったズームレンズを実現しているが、
広角端の焦点距離を十分に短くすることが難しいという
問題や、その場合に変倍比が４倍以上と更なる高変倍化
を実現するのはなかなか難しいという問題があった。SUMMARY OF THE INVENTION Japanese Patent Application Laid-Open No. 63-1898
In Japanese Patent Publication No. 19, a zoom lens having a high zoom ratio of about less than 4 times is realized with a compact lens configuration.
There are problems that it is difficult to sufficiently reduce the focal length at the wide-angle end, and in that case, it is very difficult to achieve a further high zoom ratio of 4 or more.
【０００８】又、特開昭６０−３９６１３号公報では変
倍比が５倍程度という高い変倍比を持ったズームレンズ
を実現しているものの、コンパクトなレンズ構成を維持
しつつ、全変倍域にわたって高い光学性能を発揮させる
ことはなかなか難しいという問題があった。又各レンズ
群の残存収差量が多くなる傾向にあって、各レンズ群の
位置の変化に伴って全系の焦点位置や諸収差の変化が多
くなって製造上好ましくないという問題もあった。In Japanese Patent Application Laid-Open No. 60-39613, a zoom lens having a high zoom ratio of about 5 times has been realized, but full zoom is maintained while maintaining a compact lens configuration. There is a problem that it is difficult to exhibit high optical performance over a range. Further, there is a tendency that the residual aberration amount of each lens group tends to increase, and the focal position and various aberrations of the entire system change with the change of the position of each lens group, which is not preferable in manufacturing.
【０００９】一般にズームレンズの高変倍化を図るに
は、変倍に寄与するレンズ群の数を増やしたり、又各レ
ンズ群の屈折力を強くして変倍作用を強くしたり、又変
倍に寄与するレンズ群の移動量を多くする必要がある。
しかしながら、例えばレンズ群の屈折力を強める方法で
は変倍に伴う諸収差の変動を良好に補正するために各レ
ンズ群のレンズ構成枚数を多くすることが必要となって
きて、レンズ系全体のコンパクト化が困難になるという
問題が生じてくる。In general, in order to increase the zoom ratio of a zoom lens, the number of lens units contributing to zooming is increased, or the refractive power of each lens unit is increased to increase the zooming effect. It is necessary to increase the amount of movement of the lens group that contributes to the magnification.
However, for example, in the method of increasing the refractive power of the lens units, it is necessary to increase the number of lens components of each lens unit in order to satisfactorily correct fluctuations of various aberrations caused by zooming, and thus the entire lens system is compact. A problem arises in that it becomes difficult.
【００１０】又レンズ群の移動量を多くする方法では、
変倍に伴うレンズ群の移動のためのスペースを多く確保
しなければならなく、レンズ全長が長くなり、特にレン
ズ群の移動形態が複雑な場合には移動レンズ群の鏡筒内
の支持が難しくなってきて、レンズ系全体のコンパクト
化が困難になってくるという問題点が生じてくる。In the method of increasing the amount of movement of the lens group,
It is necessary to secure a lot of space for the movement of the lens group due to zooming, and the overall length of the lens becomes longer. Especially when the movement form of the lens group is complicated, it is difficult to support the moving lens group in the lens barrel. As a result, it becomes difficult to reduce the size of the entire lens system.
【００１１】本発明はズームレンズを全体として所定の
屈折力を有する６つのレンズ群より構成し、各レンズ群
の屈折力や変倍を行うための各レンズ群の移動条件等を
適切に設定することにより、レンズ枚数を少なくし、レ
ンズ全長の短縮化を図りつつ、全変倍範囲にわたり高い
光学性能を有した変倍比４．５程度のズームレンズの提
供を目的とする。According to the present invention, the zoom lens is composed of six lens groups having a predetermined refractive power as a whole, and the refractive power of each lens group, the moving condition of each lens group for performing zooming, and the like are appropriately set. Accordingly, it is an object of the present invention to provide a zoom lens having a high zoom ratio of about 4.5 and having high optical performance over the entire zoom range while reducing the number of lenses and shortening the overall length of the lens.
【００１２】[0012]
【課題を解決するための手段】本発明のズームレンズ
は、物体側より順に正の屈折力の第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、負
の屈折力の第５群そして正の屈折力の第６群の６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は、
該第ｉ群と第（ｉ＋１）群の広角端と望遠端での空気間
隔を各々ＤｉＷ，ＤｉＴとしたとき、A zoom lens according to the present invention comprises, in order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a negative refractive power. It has six lens groups, a fourth group of power, a fifth group of negative refractive power, and a sixth group of positive refractive power. For zooming from the wide-angle end to the telephoto end,
When the air intervals at the wide-angle end and the telephoto end of the i-th lens unit and the (i + 1) -th lens unit are DiW and DiT, respectively,
【００１３】[0013]
【数２】 なる条件を満足することを特徴としている。(Equation 2) It is characterized by satisfying certain conditions.
【００１４】[0014]
【発明の実施の形態】図１〜図４は本発明の数値実施例
１〜４のレンズ断面図である。図５〜図７は本発明の数
値実施例１の広角端、中間、望遠端の収差図、図８〜図
１０は本発明の数値実施例２の広角端、中間、望遠端の
収差図、図１１〜図１３は本発明の数値実施例３の広角
端、中間、望遠端の収差図、図１４〜図１６は本発明の
数値実施例４の広角端、中間、望遠端の収差図である。
図１７〜図２０に本発明の数値実施例１〜４の各レンズ
群の移動軌跡を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 are lens sectional views of Numerical Embodiments 1 to 4 of the present invention. 5 to 7 are aberration diagrams at the wide-angle end, middle, and telephoto end of Numerical Embodiment 1 of the present invention, and FIGS. 8 to 10 are aberration diagrams at the wide-angle end, middle, and telephoto end of Numerical Embodiment 2 of the present invention. 11 to 13 are aberration diagrams at the wide-angle end, middle, and telephoto end of Numerical Embodiment 3 of the present invention, and FIGS. 14 to 16 are aberration diagrams at the wide-angle end, middle, and telephoto end of Numerical Embodiment 4 of the present invention. is there.
17 to 20 show the movement trajectories of the respective lens units in Numerical Examples 1 to 4 of the present invention.
【００１５】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、Ｌ４
は負の屈折力の第４群、Ｌ５は負の屈折力の第５群、Ｌ
６は正の屈折力の第６群、ＳＰは絞り、ＩＰは像面であ
る。矢印は広角端から望遠端への変倍に際して各レンズ
群の移動軌跡を示している。In the figure, L1 is a first group having a positive refractive power, L2 is a second group having a negative refractive power, L3 is a third group having a positive refractive power, L4
Is a fourth group having a negative refractive power, L5 is a fifth group having a negative refractive power, L
Reference numeral 6 denotes a sixth unit having a positive refractive power, SP denotes an aperture, and IP denotes an image plane. Arrows indicate the movement trajectories of the respective lens units when zooming from the wide-angle end to the telephoto end.
【００１６】本実施例では広角端から望遠端への変倍に
際しては、前述の条件式（１）を満足するように所定の
レンズ群を移動させている。即ち、第１群と第２群の間
隔が増大し、第２群と第３群の間隔が減少し、第３群と
第４群の間隔が増大し、第４群と第５群の間隔が増大
し、第５群と第６群の間隔が減少するように、所定のレ
ンズ群を移動させている。In this embodiment, at the time of zooming from the wide-angle end to the telephoto end, a predetermined lens group is moved so as to satisfy the conditional expression (1). That is, the distance between the first and second groups increases, the distance between the second and third groups decreases, the distance between the third and fourth groups increases, and the distance between the fourth and fifth groups increases. Is increased, and the predetermined lens group is moved so that the distance between the fifth group and the sixth group decreases.
【００１７】条件式（１）は広角端から望遠端への変倍
に際しての各レンズ群間の空気間隔の変化を規定する条
件式であって、各レンズ群の屈折力の符号がこのように
構成されているときに比較的少ないレンズ群の移動量で
効果的に変倍を行い、かつ全変倍域にわたって良好な光
学性能を維持している。Conditional expression (1) is a conditional expression that defines the change in the air gap between the lens units when zooming from the wide-angle end to the telephoto end, and the sign of the refractive power of each lens unit is as follows. When configured, zooming is performed effectively with a relatively small amount of lens group movement, and good optical performance is maintained over the entire zooming range.
【００１８】本実施形態では、前述の如く各レンズ群の
屈折力配置を適切に設定し、変倍の際の各レンズ群の間
の空気間隔をこのように変化させることによって、変倍
の際の諸収差の変動、主として球面収差やコマ収差の変
動を良好に補正している。これによって広角域から中望
遠域までを包含する５倍程度の変倍比を有する高性能の
ズームレンズを実現している。In this embodiment, as described above, the refractive power arrangement of each lens group is appropriately set, and the air gap between each lens group at the time of zooming is changed in this way, so that the zooming at the time of zooming is performed. Of the various aberrations, mainly spherical aberration and coma aberration, are satisfactorily corrected. As a result, a high-performance zoom lens having a zoom ratio of about 5 including the wide-angle range to the middle telephoto range is realized.
【００１９】尚、本発明において更に全変倍範囲にわた
り収差変動が少なく、画面全体にわたり高い光学性能を
得るには、広角端と望遠端における全系の焦点距離を各
々ｆＷ，ｆＴ、前記第ｉ群の焦点距離をｆｉとしたと
き、In the present invention, in order to further reduce aberration variation over the entire zoom range and obtain high optical performance over the entire screen, the focal lengths of the entire system at the wide-angle end and the telephoto end are set to fW and fT, respectively. When the focal length of the group is fi,
【００２０】[0020]
【数３】 なる条件を満足することである。(Equation 3) Satisfying the following conditions.
【００２１】条件式（２）及び条件式（３）は、第３群
及び第４群の焦点距離を光学系全系の広角端と望遠端に
おける焦点距離に対して規定したものであり、第３群及
び第４群を構成するレンズの枚数をあまり多くすること
なく、良好な光学性能を維持しながらも光学系全体を小
型なものにするための条件式である。Conditional expressions (2) and (3) define the focal lengths of the third and fourth units with respect to the focal lengths at the wide-angle end and the telephoto end of the entire optical system. This is a conditional expression for reducing the size of the entire optical system while maintaining good optical performance without increasing the number of lenses constituting the third and fourth units.
【００２２】そして、更にこのとき第３群と第４群の焦
点距離の大小関係を規定するのが条件式（４）である。Further, at this time, conditional expression (4) defines the magnitude relationship between the focal lengths of the third lens unit and the fourth lens unit.
【００２３】条件式（２）の下限値を越えて第３群の焦
点距離が短くなると、第３群で発生する球面収差が大き
くなる傾向を持ち、第３群を構成するレンズの枚数を増
やしてこれを補正する等の対策が必要となる。又この際
には第３群の許容倒れ量等が厳しくなって製造上問題と
なる。一方、条件式（２）の上限値を越えて第３群の焦
点距離が長くなると光学系の広角端における全長が長く
なる傾向を持ち、コンパクト化に向かない。When the focal length of the third lens unit becomes short below the lower limit of conditional expression (2), the spherical aberration generated in the third lens unit tends to increase, and the number of lenses constituting the third lens unit increases. Therefore, it is necessary to take measures such as correcting this. In this case, the allowable fall amount of the third lens unit becomes severe, which causes a problem in manufacturing. On the other hand, if the focal length of the third lens unit is increased beyond the upper limit value of the conditional expression (2), the overall length of the optical system at the wide-angle end tends to increase, which is not suitable for downsizing.
【００２４】条件式（３）の下限値を越えて第４群の焦
点距離の絶対値が短くなると、これより後方に配置され
る第５群及び第６群の合成焦点距離を短く設定しなけれ
ばならなくなって、レンズの構成枚数を増やすこと等が
必要となってコンパクト化に向かない。このとき第５群
及び第６群のレンズの構成枚数を少なくしようとする
と、主としてこれらのレンズ群で発生するコマ収差等の
補正が難しくなる。When the absolute value of the focal length of the fourth lens unit becomes shorter than the lower limit value of the conditional expression (3), the combined focal length of the fifth lens unit and the sixth lens unit disposed behind the fourth lens unit must be set short. However, it is necessary to increase the number of lens components, which is not suitable for downsizing. At this time, if an attempt is made to reduce the number of lenses of the fifth and sixth groups, it becomes difficult to correct coma and the like mainly occurring in these lens groups.
【００２５】条件式（４）は、このように球面収差やコ
マ収差を残存させる第３群と第４群の焦点距離の大小関
係を規定する条件式であって、条件式（２）及び条件式
（３）を満足した上で条件式（４）を満足することによ
り、これらのレンズ群の位置の変化に伴う焦点位置や収
差の変化を少なくしながら、諸収差を良好に補正してい
る。Conditional expression (4) is a conditional expression that defines the magnitude relationship between the focal lengths of the third lens unit and the fourth lens unit that causes spherical aberration and coma to remain in this manner. By satisfying the conditional expression (4) after satisfying the expression (3), various aberrations are satisfactorily corrected while reducing the change in the focal position and the aberration caused by the change in the position of these lens units. .
【００２６】尚、本発明において、特に条件式（２），
（３）をIn the present invention, in particular, conditional expressions (2) and (2)
(3)
【００２７】[0027]
【数４】 の如く特定するのが、良好なる光学性能を得る為に好ま
しい。(Equation 4) Is preferable in order to obtain good optical performance.
【００２８】本発明は高変倍比で高性能のズームレンズ
を実現するために、上記のように全体として６つのレン
ズ群を光軸上を移動させるように構成している。これら
のレンズ群を全て移動させる機構を小型のレンズ鏡筒内
に配置し、作動可能に構成するのを効果的に行い、レン
ズの保持と作動のための機構の簡略化を図っている。According to the present invention, in order to realize a high-performance zoom lens with a high zoom ratio, the six lens groups as a whole are moved on the optical axis as described above. The mechanism for moving all of these lens groups is disposed in a small lens barrel, and is effectively operable, thereby simplifying the mechanism for holding and operating the lens.
【００２９】具体的には６つのレンズ群のうちの少なく
とも１対のレンズ群を、広角端から望遠端への変倍に際
して一体的に移動する構成として、より良好な実施形態
を実現している。More specifically, at least one pair of the six lens units is integrally moved at the time of zooming from the wide-angle end to the telephoto end, thereby realizing a better embodiment. .
【００３０】また６つのレンズ群のうちの少なくとも１
つのレンズ群を広角端から望遠端への変倍に際して光軸
上で固定とする構成としても良く、これにより良好な実
施形態を実現している。At least one of the six lens groups
One lens group may be fixed on the optical axis at the time of zooming from the wide-angle end to the telephoto end, thereby realizing a preferred embodiment.
【００３１】この他に光学系の構成枚数を大幅に増やす
ことなく諸収差を良好に補正するために、いくつかのレ
ンズ面を非球面としている。本発明のズームレンズのレ
ンズ構成において、第３群或いは第４群の少なくとも１
面に非球面を用いるのが良い。これによれば主として球
面収差を良好に補正することができる。また第２群或い
は第５群の少なくとも１面に非球面を用いるのが良い。
これによれば主として広角端の非点収差や歪曲収差を良
好に補正することが容易となる。In addition, in order to favorably correct various aberrations without greatly increasing the number of components of the optical system, some lens surfaces are aspherical. In the lens configuration of the zoom lens according to the present invention, at least one of the third unit and the fourth unit is included.
It is better to use an aspheric surface. According to this, mainly spherical aberration can be favorably corrected. It is preferable to use an aspheric surface for at least one surface of the second or fifth lens unit.
According to this, it becomes easy to favorably correct mainly astigmatism and distortion at the wide-angle end.
【００３２】尚、本発明のズームレンズにおいては、無
限遠物体から近距離物体への焦点調節の際には第２群を
物体側に移動させる構成とするのが望ましいが、この他
に第１群を物体側に移動させても良い。又、第１群と第
２群を一体的に物体側に移動させる構成や、第２群と第
５群を互いの移動量を変化させながら移動させる構成を
実施すると近接撮影時にも特に良好な画像を得ることが
できる。In the zoom lens of the present invention, it is desirable to move the second lens unit to the object side when adjusting the focus from an object at infinity to an object at a short distance. The group may be moved to the object side. In addition, when a configuration in which the first and second units are integrally moved to the object side, and a configuration in which the second and fifth units are moved while changing the amount of movement of each other, particularly good results are obtained even in close-up shooting. Images can be obtained.
【００３３】本実施形態では変倍の際に第３群Ｌ３と第
６群Ｌ６を一体的に移動させる構成として、移動機構の
簡略化も図っている。また本実施形態では第６群Ｌ６の
うちの１つのレンズ面に非球面を用いて諸収差を良好に
補正している。In this embodiment, the third moving unit L3 and the sixth moving unit L6 are integrally moved during zooming, so that the moving mechanism is simplified. In this embodiment, various aberrations are favorably corrected by using an aspheric surface for one lens surface of the sixth unit L6.
【００３４】本実施形態のズームレンズは、広角端の画
角が７５°程度、望遠端の画角が１８°程度であって、
変倍比が５倍弱程度に及ぶ高変倍比を実現しながらも全
変倍範囲にわたり諸収差を良好に補正している。又、物
体距離が無限遠方のときの収差図のみを示しているが、
本実施形態では第２群Ｌ２を物体側に移動させて無限遠
物体から近距離物体への焦点調節を行っており、近接撮
影も良好に行っている。The zoom lens according to the present embodiment has an angle of view at the wide-angle end of about 75 ° and an angle of view at the telephoto end of about 18 °.
Various aberrations are satisfactorily corrected over the entire zooming range while achieving a high zooming ratio with a zooming ratio of about 5 times or less. Also, only the aberration diagram when the object distance is infinity is shown,
In the present embodiment, the second lens unit L2 is moved to the object side to adjust the focus from an object at infinity to an object at a short distance, and the close-up shooting is also performed well.
【００３５】尚、本実施形態において全変倍範囲にわた
り高い光学性能を得るには、第２群を像面側に凹面を向
けたメニスカス状の負レンズ、両レンズ面が凹面の負レ
ンズ、両レンズ面が凸面の正レンズそして像面側に凹面
を向けた負レンズより構成するのが良い。又は像面側に
凹面を向けたメニスカス状の負レンズ、正レンズと負レ
ンズとの貼合わせレンズ、そして物体側に凸面を向けた
メニスカス状の正レンズより構成するのが良い。In this embodiment, in order to obtain high optical performance over the entire zoom range, in order to obtain a high optical performance over the entire zoom range, the second lens unit has a meniscus negative lens having a concave surface facing the image surface side, a negative lens having both lens surfaces concave, It is preferable to use a positive lens having a convex lens surface and a negative lens having a concave surface facing the image surface. Alternatively, it is preferable to use a meniscus negative lens having a concave surface facing the image surface side, a cemented lens of a positive lens and a negative lens, and a meniscus positive lens having a convex surface facing the object side.
【００３６】第３群、第４群、そして第５群はいずれも
正レンズと負レンズとの貼合わせレンズより構成するの
が良い。第６群は両レンズ面が凸面の正レンズ、正レン
ズ、そして像面側に凸面を向けたメニスカス状の負レン
ズより構成するのが良い。又は両レンズ面が凸面の正レ
ンズと像面側に凸面を向けたメニスカス状の負レンズよ
り構成するのが良い。Each of the third, fourth and fifth units is preferably composed of a cemented lens of a positive lens and a negative lens. The sixth unit is preferably composed of a positive lens having both lens surfaces convex, a positive lens, and a negative meniscus lens having the convex surface facing the image plane side. Alternatively, it is preferable that both the lens surfaces are composed of a positive lens having a convex surface and a meniscus negative lens having a convex surface facing the image surface side.
【００３７】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。又前述の各条
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。 （数値実施例１） F=28.8〜131.93 FNO= 1:3.6〜5.6 2ω= 73.8°〜18.6° R 1= 121.808 D 1= 2.50 N 1=1.84666 ν 1= 23.8 R 2= 52.442 D 2= 9.10 N 2=1.69680 ν 2= 55.5 R 3= 801.035 D 3= 0.20 R 4= 49.438 D 4= 6.20 N 3=1.71300 ν 3= 53.8 R 5= 137.568 D 5=可変 R 6= 102.819 D 6= 1.20 N 4=1.83481 ν 4= 42.7 R 7= 14.866 D 7= 6.50 R 8= -58.176 D 8= 1.10 N 5=1.80400 ν 5= 46.6 R 9= 64.334 D 9= 0.20 R10= 28.590 D10= 4.80 N 6=1.84666 ν 6= 23.8 R11= -38.797 D11= 0.50 R12= -32.027 D12= 1.10 N 7=1.83481 ν 7= 42.7 R13= 93.312 D13=可変 R14= 絞り D14= 0.50 R15= 25.310 D15= 1.00 N 8=1.83400 ν 8= 37.2 R16= 16.451 D16= 5.20 N 9=1.58313 ν 9= 59.4 R17= -34.043 D17=可変 R18= 28.451 D18= 3.80 N10=1.48749 ν10= 70.2 R19= -22.563 D19= 1.00 N11=1.83400 ν11= 37.2 R20= 269.968 D20=可変 R21= -60.629 D21= 2.80 N12=1.83400 ν12= 37.2 R22= -20.123 D22= 1.00 N13=1.71300 ν13= 53.8 R23= 52.558 D23=可変 R24= 65.802 D24= 6.70 N14=1.77250 ν14= 49.6 R25= -31.379 D25= 0.20 R26= 553.542 D26= 2.50 N15=1.48749 ν15= 70.2 R27= -97.279 D27= 3.50 R28= -24.536 D28= 2.00 N16=1.84666 ν16= 23.8 R29= -73.115 Next, numerical examples of the present invention will be described. In the 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 spacing from the object side, and Ni and νi are the i-th lens surfaces in order from the object side. The refractive index and Abbe number of glass. Table 1 shows the relationship between the above-described conditional expressions and various numerical values in the numerical examples. (Numerical Example 1) F = 28.8 to 131.93 FNO = 1: 3.6 to 5.6 2ω = 73.8 ° to 18.6 ° R 1 = 121.808 D 1 = 2.50 N 1 = 1.84666 ν 1 = 23.8 R 2 = 52.442 D 2 = 9.10 N 2 = 1.69680 ν 2 = 55.5 R 3 = 801.035 D 3 = 0.20 R 4 = 49.438 D 4 = 6.20 N 3 = 1.71300 ν 3 = 53.8 R 5 = 137.568 D 5 = Variable R 6 = 102.819 D 6 = 1.20 N 4 = 1.83481 ν 4 = 42.7 R 7 = 14.866 D 7 = 6.50 R 8 = -58.176 D 8 = 1.10 N 5 = 1.80400 ν 5 = 46.6 R 9 = 64.334 D 9 = 0.20 R10 = 28.590 D10 = 4.80 N 6 = 1.84666 ν 6 = 23.8 R11 = -38.797 D11 = 0.50 R12 = -32.027 D12 = 1.10 N 7 = 1.83481 ν 7 = 42.7 R13 = 93.312 D13 = Variable R14 = Aperture D14 = 0.50 R15 = 25.310 D15 = 1.00 N 8 = 1.83400 ν 8 = 37.2 R16 = 16.451 D16 = 5.20 N 9 = 1.58313 ν 9 = 59.4 R17 = -34.043 D17 = Variable R18 = 28.451 D18 = 3.80 N10 = 1.48749 ν10 = 70.2 R19 = -22.563 D19 = 1.00 N11 = 1.83400 ν11 = 37.2 R20 = 269.968 D20 = Variable R21 = -60.629 D21 = 2.80 N12 = 1.83400 ν12 = 37.2 R22 = -20.123 D22 = 1.00 N13 = 1.71300 ν13 = 53.8 R23 = 52.558 D23 = Variable R24 = 65.802 D24 = 6.70 N14 = 1.77250 ν14 = 49.6 R25 = -31.379 D25 = 0.20 R26 = 553.542 D26 = 2.50 N15 = 1.48 749 ν15 = 70.2 R27 = -97.279 D27 = 3.50 R28 = -24.536 D28 = 2.00 N16 = 1.84666 ν16 = 23.8 R29 = -73.115
【００３８】[0038]
【表１】 非球面係数 第25面 B=2.47251D-06 C=3.28752D-09 D=-1.64652D-11 E=1.48001D-14 （数値実施例２） F=28.89〜131.94 FNO= 1:3.6〜5.7 2ω=73.6°〜18.6° R 1= 151.951 D 1= 2.50 N 1=1.84666 ν 1= 23.8 R 2= 53.697 D 2=10.50 N 2=1.69680 ν 2= 55.5 R 3= -803.847 D 3= 0.20 R 4= 44.709 D 4= 6.40 N 3=1.71300 ν 3= 53.8 R 5= 119.803 D 5=可変 R 6= 99.801 D 6= 1.20 N 4=1.80400 ν 4= 46.6 R 7= 14.059 D 7= 5.40 R 8= -77.595 D 8= 4.80 N 5=1.80518 ν 5= 25.4 R 9= -13.978 D 9= 1.10 N 6=1.88300 ν 6= 40.8 R10= 68.567 D10= 0.20 R11= 29.045 D11= 2.40 N 7=1.84666 ν 7= 23.8 R12= 68.892 D12=可変 R13= 絞り D13= 1.00 R14= 22.799 D14= 1.00 N 8=1.83400 ν 8= 37.2 R15= 13.953 D15= 4.80 N 9=1.58313 ν 9= 59.4 R16= -42.539 D16=可変 R17= 27.755 D17= 3.50 N10=1.48749 ν10= 70.2 R18= -26.819 D18= 1.00 N11=1.83400 ν11= 37.2 R19= 113.291 D19=可変 R20= -72.900 D20= 2.80 N12=1.83400 ν12= 37.2 R21= -17.376 D21= 1.00 N13=1.71300 ν13= 53.8 R22= 42.619 D22=可変 R23= 45.913 D23= 8.40 N14=1.67790 ν14= 55.3 R24= -31.886 D24= 0.20 R25= 47.606 D25= 3.40 N15=1.60311 ν15= 60.7 R26= 205.550 D26= 4.60 R27= -31.133 D27= 2.00 N16=1.84666 ν16= 23.8 R28= -350.969 [Table 1] Aspheric coefficient 25th surface B = 2.47251D-06 C = 3.28752D-09 D = -1.64652D-11 E = 1.48001D-14 (Numerical example 2) F = 28.89-131.94 FNO = 1: 3.6-5.72Ω = 73.6 ° ~ 18.6 ° R 1 = 151.951 D 1 = 2.50 N 1 = 1.84666 ν 1 = 23.8 R 2 = 53.697 D 2 = 10.50 N 2 = 1.69680 ν 2 = 55.5 R 3 = -803.847 D 3 = 0.20 R 4 = 44.709 D 4 = 6.40 N 3 = 1.71300 ν 3 = 53.8 R 5 = 119.803 D 5 = Variable R 6 = 99.801 D 6 = 1.20 N 4 = 1.80400 ν 4 = 46.6 R 7 = 14.059 D 7 = 5.40 R 8 = -77.595 D 8 = 4.80 N 5 = 1.80518 ν 5 = 25.4 R 9 = -13.978 D 9 = 1.10 N 6 = 1.88300 ν 6 = 40.8 R10 = 68.567 D10 = 0.20 R11 = 29.045 D11 = 2.40 N 7 = 1.84666 ν 7 = 23.8 R12 = 68.892 D12 = Variable R13 = Aperture D13 = 1.00 R14 = 22.799 D14 = 1.00 N 8 = 1.83400 ν 8 = 37.2 R15 = 13.953 D15 = 4.80 N 9 = 1.58313 ν 9 = 59.4 R16 = -42.539 D16 = Variable R17 = 27.755 D17 = 3.50 N10 = 1.48749 ν10 = 70.2 R18 = -26.819 D18 = 1.00 N11 = 1.83400 ν11 = 37.2 R19 = 113.291 D19 = Variable R20 = -72.900 D20 = 2.80 N12 = 1.83400 ν12 = 37.2 R21 = -17.376 D21 = 1.00 N13 = 1.71300 ν13 = 53.8 R22 = 42.619 D22 = Variable R23 = 45.913 D23 = 8.40 N14 = 1.67790 ν14 = 55.3 R24 = -31.886 D24 = 0.20 R25 = 47.606 D25 = 3.40 N15 = 1.60311 ν15 = 60.7 R26 = 205.550 D26 = 4.60 R27 = -31.133 D27 = 2.00 N16 = 1.84666 ν16 = 23.8 R28 = -350.969
【００３９】[0039]
【表２】 非球面係数 第16面 B=8.22122D-07 C=3.22173D-09 D=-1.83017D-10 E=6.07218D-13 第24面 B=4.57122D-06 C=7.68462D-09 D=-1.86727D-11 E=2.48319D-14 （数値実施例３） F=28.87〜131.94 FNO= 1:3.6〜5.5 2ω=73.6°〜18.6° R 1= 120.296 D 1= 2.50 N 1=1.84666 ν 1= 23.8 R 2= 49.918 D 2= 9.50 N 2=1.69680 ν 2= 55.5 R 3= 1941.636 D 3= 0.20 R 4= 47.211 D 4= 6.20 N 3=1.71300 ν 3= 53.8 R 5= 129.698 D 5=可変 R 6= 95.591 D 6= 1.20 N 4=1.83481 ν 4= 42.7 R 7= 13.960 D 7= 6.00 R 8= -42.557 D 8= 1.10 N 5=1.80400 ν 5= 46.6 R 9= 58.139 D 9= 0.20 R10= 29.092 D10= 4.40 N 6=1.84666 ν 6= 23.8 R11= -30.489 D11= 0.60 R12= -24.444 D12= 1.10 N 7=1.83481 ν 7= 42.7 R13= 301.716 D13=可変 R14= 絞り D14= 1.00 R15= 21.944 D15= 1.00 N 8=1.83400 ν 8= 37.2 R16= 13.493 D16= 5.50 N 9=1.58313 ν 9= 59.4 R17= -30.326 D17=可変 R18= 32.932 D18= 3.80 N10=1.48749 ν10= 70.2 R19= -22.873 D19= 1.00 N11=1.83400 ν11= 37.2 R20= 811.355 D20=可変 R21= -45.754 D21= 2.50 N12=1.83400 ν12= 37.2 R22= -21.435 D22= 1.00 N13=1.69680 ν13= 55.5 R23= 62.478 D23=可変 R24= 46.360 D24= 8.20 N14=1.67790 ν14= 55.3 R25= -24.945 D25= 5.20 R26= -21.927 D26= 2.00 N15=1.84666 ν15= 23.8 R27= -51.716 [Table 2] Aspheric coefficient Surface 16 B = 8.22122D-07 C = 3.22173D-09 D = -1.83017D-10 E = 6.07218D-13 Surface 24 B = 4.57122D-06 C = 7.68462D-09 D = -1.86727 D-11 E = 2.48319D-14 (Numerical Example 3) F = 28.87-131.94 FNO = 1: 3.6-5.5 2ω = 73.6 ° -18.6 ° R 1 = 120.296 D 1 = 2.50 N 1 = 1.84666 ν 1 = 23.8 R 2 = 49.918 D 2 = 9.50 N 2 = 1.69680 ν 2 = 55.5 R 3 = 1941.636 D 3 = 0.20 R 4 = 47.211 D 4 = 6.20 N 3 = 1.71300 ν 3 = 53.8 R 5 = 129.698 D 5 = Variable R 6 = 95.591 D 6 = 1.20 N 4 = 1.83481 ν 4 = 42.7 R 7 = 13.960 D 7 = 6.00 R 8 = -42.557 D 8 = 1.10 N 5 = 1.80400 ν 5 = 46.6 R 9 = 58.139 D 9 = 0.20 R10 = 29.092 D10 = 4.40 N 6 = 1.84666 ν 6 = 23.8 R11 = -30.489 D11 = 0.60 R12 = -24.444 D12 = 1.10 N 7 = 1.83481 ν 7 = 42.7 R13 = 301.716 D13 = Variable R14 = Aperture D14 = 1.00 R15 = 21.944 D15 = 1.00 N 8 = 1.83400 ν 8 = 37.2 R16 = 13.493 D16 = 5.50 N 9 = 1.58313 ν 9 = 59.4 R17 = -30.326 D17 = Variable R18 = 32.932 D18 = 3.80 N10 = 1.48749 ν10 = 70.2 R19 = -22.873 D19 = 1.00 N11 = 1.83400 ν11 = 37.2 R20 = 811.355 D20 = variable R21 = -45.754 D21 = 2.50 N12 = 1.83400 ν12 = 37.2 R22 = -21.435 D22 = 1 .00 N13 = 1.69680 ν13 = 55.5 R23 = 62.478 D23 = Variable R24 = 46.360 D24 = 8.20 N14 = 1.67790 ν14 = 55.3 R25 = -24.945 D25 = 5.20 R26 = -21.927 D26 = 2.00 N15 = 1.84666 ν15 = 23.8 R27 = -51.716
【００４０】[0040]
【表３】 非球面係数 第17面 B=3.70111D-06 C=-2.13676D-08 D= 8.88519D-11 E=-1.07141D-12 第25面 B=8.60798D-06 C= 1.86716D-08 D=-6.45018D-11 E= 1.13224D-13 （数値実施例４ F=28.86〜131.9 FNO= 1:3.6〜5.2 2ω=73.8°〜18.6° R 1= 121.291 D 1= 2.50 N 1=1.84666 ν 1= 23.8 R 2= 53.171 D 2=10.00 N 2=1.69680 ν 2= 55.5 R 3= 1523.742 D 3= 0.20 R 4= 47.600 D 4= 6.80 N 3=1.71300 ν 3= 53.8 R 5= 130.456 D 5=可変 R 6= 98.163 D 6= 1.20 N 4=1.83481 ν 4= 42.7 R 7= 13.993 D 7= 5.90 R 8= -44.331 D 8= 1.10 N 5=1.80400 ν 5= 46.6 R 9= 45.290 D 9= 0.20 R10= 27.739 D10= 4.40 N 6=1.84666 ν 6= 23.8 R11= -32.383 D11= 0.60 R12= -25.029 D12= 1.10 N 7=1.83481 ν 7= 42.7 R13=-2106.474 D13=可変 R14= 絞り D14= 1.00 R15= 24.077 D15= 1.00 N 8=1.83400 ν 8= 37.2 R16= 15.158 D16= 5.00 N 9=1.60311 ν 9= 60.7 R17= -31.892 D17=可変 R18= 35.950 D18= 3.80 N10=1.48749 ν10= 70.2 R19= -18.576 D19= 1.00 N11=1.83400 ν11= 37.2 R20= 279.240 D20=可変 R21= -42.747 D21= 2.50 N12=1.83400 ν12= 37.2 R22= -18.105 D22= 1.00 N13=1.69680 ν13= 55.5 R23= 171.448 D23=可変 R24= 52.960 D24= 7.30 N14=1.67790 ν14= 55.3 R25= -24.156 D25= 5.40 R26= -20.920 D26= 2.00 N15=1.84666 ν15= 23.8 R27= -42.987 [Table 3] Aspheric surface 17th surface B = 3.70111D-06 C = -2.13676D-08 D = 8.88519D-11 E = -1.07141D-12 25th surface B = 8.60798D-06 C = 1.86716D-08 D =- 6.45018D-11 E = 1.13224D-13 (Numerical Example 4 F = 28.86 to 131.9 FNO = 1: 3.6 to 5.2 2ω = 73.8 ° to 18.6 ° R 1 = 121.291 D 1 = 2.50 N 1 = 1.84666 ν 1 = 23.8 R 2 = 53.171 D 2 = 10.00 N 2 = 1.69680 ν 2 = 55.5 R 3 = 1523.742 D 3 = 0.20 R 4 = 47.600 D 4 = 6.80 N 3 = 1.71300 ν 3 = 53.8 R 5 = 130.456 D 5 = Variable R 6 = 98.163 D 6 = 1.20 N 4 = 1.83481 ν 4 = 42.7 R 7 = 13.993 D 7 = 5.90 R 8 = -44.331 D 8 = 1.10 N 5 = 1.80400 ν 5 = 46.6 R 9 = 45.290 D 9 = 0.20 R10 = 27.739 D10 = 4.40 N 6 = 1.84666 ν 6 = 23.8 R11 = -32.383 D11 = 0.60 R12 = -25.029 D12 = 1.10 N 7 = 1.83481 ν 7 = 42.7 R13 = -2106.474 D13 = Variable R14 = Aperture D14 = 1.00 R15 = 24.077 D15 = 1.00 N 8 = 1.83400 ν 8 = 37.2 R16 = 15.158 D16 = 5.00 N 9 = 1.60311 ν 9 = 60.7 R17 = -31.892 D17 = Variable R18 = 35.950 D18 = 3.80 N10 = 1.48749 ν10 = 70.2 R19 = -18.576 D19 = 1.00 N11 = 1.83400 ν11 = 37.2 R20 = 279.240 D20 = Variable R21 = -42.747 D21 = 2.50 N12 = 1.83400 ν12 = 37.2 R22 = -18.105 D22 = 1.00 N13 = 1.69680 ν13 = 55.5 R23 = 171.448 D23 = Variable R24 = 52.960 D24 = 7.30 N14 = 1.67790 ν14 = 55.3 R25 = -24.156 D25 = 5.40 R26 = -20.920 D26 = 2.00 N15 = 1.84666 ν15 = 23.8 R27 = -42.987
【００４１】[0041]
【表４】 非球面係数 第25面 B=8.60798D-06 C=1.86716D-08 D=-6.45018D-11 E=1.13224D-13 [Table 4] Aspheric surface 25th surface B = 8.60798D-06 C = 1.86716D-08 D = -6.45018D-11 E = 1.13224D-13
【００４２】[0042]
【表５】 [Table 5]
【００４３】[0043]
【発明の効果】本発明によれば以上のように、ズームレ
ンズを全体として所定の屈折力を有する６つのレンズ群
より構成し、各レンズ群の屈折力や変倍を行うための各
レンズ群の移動条件等を適切に設定することにより、レ
ンズ枚数を少なくし、レンズ全長の短縮化を図りつつ、
全変倍範囲にわたり高い光学性能を有した変倍比４．５
程度のズームレンズを達成することができる。According to the present invention, as described above, the zoom lens is composed of six lens groups having a predetermined refractive power as a whole, and each lens group for performing the refractive power and zooming of each lens group. By appropriately setting the moving conditions, etc., the number of lenses is reduced and the overall length of the lens is shortened.
Zoom ratio 4.5 with high optical performance over the entire zoom range
A degree of zoom lens can be achieved.
【図１】 本発明の数値実施例１のレンズ断面図FIG. 1 is a sectional view of a lens according to a 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 sectional view of a lens according to a 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 sectional view of a lens according to a numerical example 3 of the present invention.
【図４】 本発明の数値実施例４のレンズ断面図FIG. 4 is a sectional view of a lens according to a numerical example 4 of the present invention.
【図５】 本発明の数値実施例１の広角端の収差図FIG. 5 is an aberration diagram at a wide-angle end according to Numerical Embodiment 1 of the present invention.
【図６】 本発明の数値実施例１の中間の収差図FIG. 6 is an intermediate aberration diagram of the numerical example 1 of the present invention.
【図７】 本発明の数値実施例１の望遠端の収差図FIG. 7 is an aberration diagram at a telephoto end in Numerical Example 1 of the present invention.
【図８】 本発明の数値実施例２の広角端の収差図FIG. 8 is an aberration diagram at a wide angle end according to Numerical Example 2 of the present invention.
【図９】 本発明の数値実施例２の中間の収差図FIG. 9 is an intermediate aberration diagram of the numerical example 2 of the present invention.
【図１０】 本発明の数値実施例２の望遠端の収差図FIG. 10 is an aberration diagram at a telephoto end in Numerical Example 2 of the present invention.
【図１１】 本発明の数値実施例３の広角端の収差図FIG. 11 is an aberration diagram at a wide angle end according to Numerical Example 3 of the present invention.
【図１２】 本発明の数値実施例３の中間の収差図FIG. 12 is an intermediate aberration diagram of the numerical example 3 of the present invention.
【図１３】 本発明の数値実施例３の望遠端の収差図FIG. 13 is an aberration diagram at a telephoto end in Numerical Example 3 of the present invention.
【図１４】 本発明の数値実施例４の広角端の収差図FIG. 14 is an aberration diagram at a wide angle end according to Numerical Example 4 of the present invention.
【図１５】 本発明の数値実施例４の中間の収差図FIG. 15 is an intermediate aberration diagram of the numerical example 4 of the present invention.
【図１６】 本発明の数値実施例４の望遠端の収差図FIG. 16 is an aberration diagram at a telephoto end in Numerical Example 4 of the present invention.
【図１７】 本発明の数値実施例１の変倍に伴う移動軌
跡の説明図FIG. 17 is an explanatory diagram of a movement trajectory accompanying zooming in Numerical Example 1 of the present invention.
【図１８】 本発明の数値実施例２の変倍に伴う移動軌
跡の説明図FIG. 18 is an explanatory diagram of a movement trajectory accompanying zooming in Numerical Example 2 of the present invention.
【図１９】 本発明の数値実施例３の変倍に伴う移動軌
跡の説明図FIG. 19 is an explanatory diagram of a moving trajectory accompanying zooming in Numerical Example 3 of the present invention.
【図２０】 本発明の数値実施例４の変倍に伴う移動軌
跡の説明図FIG. 20 is an explanatory diagram of a moving trajectory accompanying zooming in Numerical Example 4 of the present invention.
Ｌ１ 第１群 Ｌ２ 第２群 Ｌ３ 第３群 Ｌ４ 第４群 Ｌ５ 第５群 Ｌ６ 第６群 ＳＰ 絞り ＩＰ 像面 ｄ ｄ線 ｇ ｇ線 ΔＳ サジタル像面 ΔＭ メリディオナル像面 L1 First lens unit L2 Second lens unit L3 Third lens unit L4 Fourth lens unit L5 Fifth lens unit L6 Sixth lens unit SP Aperture IP image plane d d-line g g-line ΔS Sagittal image plane ΔM Meridional image plane
Claims (2)
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、負の屈折力の第５群そして正の屈折力の第６群
の６つのレンズ群を有し、広角端から望遠端への変倍に
際しては、該第ｉ群と第（ｉ＋１）群の広角端と望遠端
での空気間隔を各々ＤｉＷ，ＤｉＴとしたとき、 Ｄ１Ｗ ＜ Ｄ１Ｔ Ｄ２Ｗ ＞ Ｄ２Ｔ Ｄ３Ｗ ＜ Ｄ３Ｔ Ｄ４Ｗ ＜ Ｄ４Ｔ Ｄ５Ｗ ＞ Ｄ５Ｔ なる条件を満足することを特徴とするズームレンズ。1. A first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a negative lens having a negative refractive power in order from the object side. The zoom lens system includes six lens units, a fifth unit and a sixth unit having a positive refractive power. When zooming from the wide-angle end to the telephoto end, at the wide-angle end and the telephoto end of the i-th unit and the (i + 1) -th unit, Where D1W <D1T D2W> D2T D3W <D3T D4W <D4T D5W> D5T, where DiW and DiT are the air spacings of (1) and (2), respectively.
を各々ｆＷ，ｆＴ、前記第ｉ群の焦点距離をｆｉとした
とき、 【数１】 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。2. When the focal lengths of the entire system at the wide-angle end and the telephoto end are fW and fT, respectively, and the focal length of the i-th lens unit is fi, The zoom lens according to claim 1, wherein the following condition is satisfied.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35627296A JPH10186234A (en) | 1996-12-25 | 1996-12-25 | Zoom lens |
| US08/957,162 US6061180A (en) | 1996-10-29 | 1997-10-24 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35627296A JPH10186234A (en) | 1996-12-25 | 1996-12-25 | Zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10186234A true JPH10186234A (en) | 1998-07-14 |
Family
ID=18448202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35627296A Withdrawn JPH10186234A (en) | 1996-10-29 | 1996-12-25 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10186234A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010039271A (en) * | 2008-08-06 | 2010-02-18 | Sony Corp | Variable focal length lens system |
| WO2013129490A1 (en) * | 2012-02-29 | 2013-09-06 | 株式会社ニコン | Zooming optical system, optical device, and method for manufacturing zooming optical system |
| JP2016122221A (en) * | 2016-04-07 | 2016-07-07 | 株式会社ニコン | Variable power optical system, optical device, and method for manufacturing variable power optical system |
-
1996
- 1996-12-25 JP JP35627296A patent/JPH10186234A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010039271A (en) * | 2008-08-06 | 2010-02-18 | Sony Corp | Variable focal length lens system |
| WO2013129490A1 (en) * | 2012-02-29 | 2013-09-06 | 株式会社ニコン | Zooming optical system, optical device, and method for manufacturing zooming optical system |
| JP2013182022A (en) * | 2012-02-29 | 2013-09-12 | Nikon Corp | Variable power optical system, optical device, and method for manufacturing variable power optical system |
| CN104136956A (en) * | 2012-02-29 | 2014-11-05 | 株式会社尼康 | Zooming optical system, optical device, and method for manufacturing zooming optical system |
| US9684154B2 (en) | 2012-02-29 | 2017-06-20 | Nikon Corporation | Zooming optical system, optical apparatus and method for manufacturing zooming optical system |
| CN107621690A (en) * | 2012-02-29 | 2018-01-23 | 株式会社尼康 | Varifocal optical system |
| CN108490592A (en) * | 2012-02-29 | 2018-09-04 | 株式会社尼康 | Varifocal optical system |
| CN107621690B (en) * | 2012-02-29 | 2020-06-09 | 株式会社尼康 | Zoom optical system |
| CN108490592B (en) * | 2012-02-29 | 2021-01-29 | 株式会社尼康 | Zoom optical system |
| JP2016122221A (en) * | 2016-04-07 | 2016-07-07 | 株式会社ニコン | Variable power optical system, optical device, and method for manufacturing variable power optical system |
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