JPH0886963A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPH0886963A JPH0886963A JP25134394A JP25134394A JPH0886963A JP H0886963 A JPH0886963 A JP H0886963A JP 25134394 A JP25134394 A JP 25134394A JP 25134394 A JP25134394 A JP 25134394A JP H0886963 A JPH0886963 A JP H0886963A
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- Prior art keywords
- lens
- group
- refractive power
- positive
- object side
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はズームレンズに関し、特
に広角端での撮影画角が７５度程度、Ｆナンバー４〜６
程度、変倍比６〜７程度の全変倍範囲にわたり良好なる
光学性能を有した写真用カメラやビデオカメラ、そして
電子スチルカメラ等に好適な高変倍比、広画角のズーム
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, and more particularly, a shooting angle of view at the wide-angle end is about 75 degrees and an F number of 4 to 6 is used.
A zoom lens having a high zoom ratio and a wide angle of view, which is suitable for a photographic camera, a video camera, an electronic still camera and the like having good optical performance over the entire zoom range of about 6 to 7 zoom ratios. Is.
【０００２】[0002]
【従来の技術】従来よ写真用カメラやビデオカメラ等の
撮影系には高変倍比で広画角で、しかも全変倍範囲にわ
たり高コントラスト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。特開昭６０−１４２１３号公報や
特開昭６０−１４２１４号公報では、物体側より順に
正、負、正、そして正の屈折力の４つのレンズ群より成
り、広角端の撮影画角が６０度程度、変倍比３〜６程度
のズームレンズが提案されている。特開昭６３−６６５
２３号公報や特開昭６３−２９４５０６号公報では、物
体側より順に正、負、正、そして正の屈折力の４つのレ
ンズ群より成り、広角端の撮影画角が７０度程度、変倍
比３〜４程度のズームレンズが提案されている。特開平
４−７０７０８号公報では、物体側より順に正、負、
正、正、そして負の屈折力の５つのレンズ群より成り、
広角端の撮影画角が７０度程度、変倍比７程度のズーム
レンズが提案されている。2. Description of the Related Art Conventionally, a zoom lens having a high zoom ratio, a wide angle of view, a high contrast and a high optical performance over the entire zoom range is required for a photographing system such as a photographic camera or a video camera. There is. In Japanese Patent Laid-Open No. 60-14213 and Japanese Patent Laid-Open No. 60-14214, there are four lens groups having positive, negative, positive, and positive refractive powers in order from the object side, and the photographing angle of view at the wide-angle end is 60. A zoom lens with a magnification of about 3 to 6 has been proposed. JP-A-63-665
According to Japanese Patent Laid-Open No. 23-43506 and Japanese Patent Application Laid-Open No. 63-294506, the lens group consists of four lens groups having positive, negative, positive, and positive refracting powers in order from the object side. A zoom lens having a ratio of about 3 to 4 has been proposed. In Japanese Patent Laid-Open No. 4-70708, positive, negative, and
It consists of five lens groups with positive, positive and negative refractive power,
A zoom lens with a shooting angle of view at the wide-angle end of about 70 degrees and a zoom ratio of about 7 has been proposed.
【０００３】この他、特開昭６２−２４７３１６号公報
や特開昭６２−２４２１３号公報で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、そして正の屈折力の第４群の４つのレンズ群を
有し、第２群を移動させて変倍を行い、第４群を移動さ
せて変倍に伴う像面変動とフォーカスを行っている。In addition, in JP-A-62-247316 and JP-A-62-24213, the first group having a positive refractive power, the second group having a negative refractive power, and the positive refractive power are sequentially arranged from the object side. Of the third lens group and a fourth lens group of positive refractive power, the second lens group is moved to perform zooming, and the fourth lens group is moved to change the image plane due to zooming. I'm focusing.
【０００４】また特開昭５８−１６０９１３号公報では
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、そして正の屈折力の第４群の
４つのレンズ群を有し、第１群と第２群を移動させて変
倍を行い、変倍に伴う像面変動を第４群を移動させて行
っている。そしてこれらのレンズ群のうち１つ又は２つ
以上のレンズ群を移動させてフォーカスを行っている。In JP-A-58-160913, the first group having a positive refractive power and the second group having a negative refractive power are arranged in this order from the object side.
An image associated with zooming, which has four lens groups, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, and moving the first lens group and the second lens group for zooming. The surface movement is performed by moving the fourth group. Then, focusing is performed by moving one or more lens groups among these lens groups.
【０００５】[0005]
【発明が解決しようとする課題】一般に物体側より順に
正、負、正、そして正の屈折力の４つのレンズ群より成
る４群ズームレンズにおいて、広角端での撮影画角が７
５度程度の広画角化及び変倍比６〜７程度の高変倍化を
図りつつ全変倍範囲にわたり高い光学性能を維持し、所
定の口径比を得るにはレンズ系を構成する各レンズ群の
光学的諸定数を適切に設定することが重要となってく
る。Generally, in a four-group zoom lens composed of four lens groups having positive, negative, positive, and positive refractive powers in order from the object side, the photographing field angle at the wide-angle end is 7
In order to maintain a high optical performance over the entire zoom range and obtain a predetermined aperture ratio while achieving a wide angle of view of about 5 degrees and a high zoom ratio of about 6 to 7, each lens system is configured. It is important to set the optical constants of the lens group appropriately.
【０００６】例えば前述の４群ズームレンズにおいて、
変倍に伴う各レンズ群の移動条件や各レンズ群の屈折力
そして変倍作用をする第２群の変倍比や倍率等を適切に
設定しないと諸収差の発生が増大し、良好なる画質の映
像を得るのが難しくなってくる。For example, in the above-mentioned four-group zoom lens,
If the moving conditions of each lens unit associated with zooming, the refracting power of each lens unit, and the zooming ratio and magnification of the second lens unit that performs zooming are not set appropriately, the occurrence of various aberrations will increase and good image quality will be obtained. It becomes difficult to get the video of.
【０００７】本発明は４群ズームレンズにおいて、主に
変倍に伴う各レンズ群の移動条件や、各レンズ群の屈折
力、そして第２群の変倍比等を適切に設定することによ
り広角端の撮影画角が７５度程度、変倍比６〜７程度の
全変倍範囲にわたり、しかも全画面にわたり高い光学性
能を有するズームレンズの提供を目的とする。According to the present invention, in a four-group zoom lens, a wide-angle lens is mainly set by appropriately setting the moving condition of each lens group associated with zooming, the refractive power of each lens group, and the zooming ratio of the second group. It is an object of the present invention to provide a zoom lens having an optical angle of view of about 75 degrees, a zoom ratio of about 6 to 7, and a high optical performance over the entire screen.
【０００８】[0008]
【課題を解決するための手段】本発明のズームレンズ
は、 （１−１）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、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
の変倍に際して各レンズ群を物体側へ、該第１群と第２
群の間隔が増加し、該第２群と第３群の間隔が減少し、
該第３群と第４群の間隔が減少するように移動させてお
り、該第４群は正の屈折力の第４１成分、正の屈折力の
第４２成分、そして負の屈折力の第４３成分の３つの成
分を有し、かつレンズ中心からレンズ周辺にいくに従い
正の屈折力が弱くなる形状の非球面を有しており、該第
ｉ群の焦点距離をｆｉ、広角端と望遠端における全系の
焦点距離を各々ｆｗ，ｆＴ、該第２群の変倍比をＺ２と
したとき ０．０５＜｜ｆ２｜／ｆＴ＜０．０９ ・・・・・・・・（１ａ） ０．３ ＜ ｆ１／ｆＴ ＜０．７ ・・・・・・・・・・（２ａ） ０．２ ＜ ｆ４／ｆＴ ＜０．４ ・・・・・・・・・・（３ａ） ３ ＜ Ｚ２ ＜４ ・・・・・・・・・・・・・・・・（４ａ） なる条件を満足することを特徴としている。The zoom lens of the present invention comprises (1-1) 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. And a fourth lens unit having a positive refracting power, that is, the fourth lens unit, and the first lens unit and the second lens unit when moving the zoom lens from the wide-angle end to the telephoto end.
The distance between the groups increases, the distance between the second and third groups decreases,
The third lens unit and the fourth lens unit are moved so that the distance between them decreases. The fourth lens unit has a positive refractive power 41st component, a positive refractive power 42nd component, and a negative refractive power It has three components of 43 components, and has an aspherical surface whose positive refractive power becomes weaker from the lens center to the lens periphery. The focal length of the i-th group is fi, the wide-angle end and the telephoto end. When the focal lengths of the entire system at the edges are fw and fT and the zoom ratio of the second lens unit is Z2, 0.05 <| f2 | / fT <0.09 (1a) 0.3 <f1 / fT <0.7 (2a) 0.2 <f4 / fT <0.4 (3a) 3 < Z2 <4 (4a) is satisfied.
【０００９】（１−２）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、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各レンズ群を物体側へ、該
第１群と第２群の間隔が増加し、該第２群と第３群の間
隔が減少し、該第３群と第４群の間隔が減少するように
移動させており、フォーカスを第２群を光軸上移動させ
て行っており、該第ｉ群の焦点距離をｆｉ、広角端と望
遠端における全系の焦点距離を各々ｆｗ，ｆＴ、該第２
群の変倍比と望遠端での倍率を各々をＺ２，β２Ｔとし
たとき ０．０５＜｜ｆ２｜／ｆＴ＜０．０９ ・・・・・・・・（１ｂ） ０．３ ＜ ｆ１／ｆＴ ＜０．７ ・・・・・・・・・・（２ｂ） ０．２ ＜ ｆ４／ｆＴ ＜０．４ ・・・・・・・・・・（３ｂ） ３ ＜ Ｚ２ ＜４ ・・・・・・・・・・・・・・・・（４ｂ） ｜β２Ｔ｜＜１ ・・・・・・・・・・・・・・・・（５ｂ） なる条件を満足することを特徴としている。(1-2) In order from the object side, the first group of positive refracting power, the second group of negative refracting power, the third group of positive refracting power, and the fourth group of positive refracting power When the magnification is changed from the wide-angle end to the telephoto end, each lens group is moved toward the object side, and the distance between the first and second groups is increased, and the distance between the second and third groups is increased. The third lens unit is moved so that the distance between the third lens unit and the fourth lens unit is reduced, and the focus is moved by moving the second lens unit on the optical axis. The focal lengths of the entire system at the end and the telephoto end are fw and fT, respectively.
When the zoom ratio of the group and the magnification at the telephoto end are Z2 and β2T, respectively, 0.05 <| f2 | / fT <0.09 ... (1b) 0.3 <f1 / fT <0.7 (2b) 0.2 <f4 / fT <0.4 (3b) 3 <Z2 <4 ...・ ・ ・ ・ ・ ・ ・ ・ (4b) | β2T | <1 ・ ・ ・ (5b) .
【００１０】[0010]
【実施例】図１〜図３は本発明の数値実施例１〜３の広
角端におけるレンズ断面図である。1 to 3 are lens cross-sectional views at the wide-angle end in Numerical Embodiments 1 to 3 of the present invention.
【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、Ｌ４
は正の屈折力の第４群、ＳＰは絞りであり第３群の前方
に設けている。ＳＫは固定絞りである。第４群Ｌ４は正
の屈折力の第４１成分Ｌ４１、正の屈折力の第４２成分
Ｌ４２、そして負の屈折力の第４３成分Ｌ４３の３つの
成分を有している。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, and L4.
Is a fourth lens unit having a positive refracting power, and SP is a diaphragm provided in front of the third lens unit. SK is a fixed diaphragm. The fourth lens unit L4 has three components, that is, a 41st component L41 having a positive refractive power, a 42nd component L42 having a positive refractive power, and a 43rd component L43 having a negative refractive power.
【００１２】本実施例では広角端から望遠端への変倍に
際して、各レンズ群を矢印の如く物体側へ第１群と第２
群の間隔が増加し、第２群と第３群の間隔が減少し、第
３群と第４群の間隔が減少するように移動させている。
尚、絞りＳＰは第３群と一体的に移動させている。In this embodiment, at the time of zooming from the wide-angle end to the telephoto end, each lens unit is moved toward the object side as shown by an arrow.
The distance between the groups is increased, the distance between the second group and the third group is decreased, and the distance between the third group and the fourth group is decreased.
The diaphragm SP is moved integrally with the third lens group.
【００１３】本実施例では前述の如く、４つのレンズ群
の屈折力と変倍に伴う各レンズ群の移動条件を設定する
と共に第４群のレンズ構成を３つの成分より構成してい
る。また第４群中にレンズ中心からレンズ周辺にいくに
従い正の屈折力が弱くなる形状の非球面を設けている。In the present embodiment, as described above, the refractive powers of the four lens groups and the moving conditions of each lens group associated with zooming are set, and the lens structure of the fourth lens group is made up of three components. Further, an aspherical surface having a shape in which the positive refractive power becomes weaker from the lens center to the lens periphery is provided in the fourth lens unit.
【００１４】本発明では以上のような構成により広角端
での撮影画角が７５度と広画角で変倍比６〜７程度、Ｆ
ナンバー４〜６程度の全変倍範囲にわたり良好なる光学
性能を有したズームレンズを得ている。特に第１群から
第３群までのレンズ系による残存収差を前述の如く３つ
の成分より構成した第４群で良好に補正している。According to the present invention, with the above construction, the photographing angle of view at the wide angle end is 75 degrees, and the zoom ratio is about 6 to 7 at the wide angle of view and F
A zoom lens having good optical performance over the entire zoom range of Nos. 4 to 6 is obtained. In particular, residual aberrations due to the lens systems from the first group to the third group are satisfactorily corrected by the fourth group composed of three components as described above.
【００１５】また本発明においてはフォーカスを第２群
を移動させて行っており、これにより第１群のレンズ外
径の増大を防止しつつ、撮影可能な至近距離の短縮化を
図っている。第４群中に前述の形状の非球面を用いるこ
とにより、主に球面収差、非点収差、そして像面弯曲を
バランス良く補正している。特に広角側での高次の像面
弯曲を良好に補正している。Further, in the present invention, the focusing is carried out by moving the second lens group, thereby preventing the increase of the outer diameter of the lens of the first lens group and shortening the close-up distance at which the image can be taken. By using the aspherical surface having the above-described shape in the fourth lens unit, spherical aberration, astigmatism, and field curvature are mainly corrected in good balance. Especially, the high-order field curvature on the wide-angle side is well corrected.
【００１６】次に前述の条件式の技術的意味について説
明する。尚、第１発明に係る条件式（１ａ）〜（４ａ）
は第２発明に係る条件式（１ｂ）〜（４ｂ）と同じであ
る為、以下条件式（１）〜（４）と称して説明する。Next, the technical meaning of the above conditional expression will be described. The conditional expressions (1a) to (4a) according to the first aspect of the invention.
Is the same as the conditional expressions (1b) to (4b) according to the second aspect of the invention, and therefore will be described below as conditional expressions (1) to (4).
【００１７】条件式（１）は負の屈折力の第２群の焦点
距離と望遠端の全系の焦点距離との比を規定し、主にレ
ンズ全長を短くしつつ高変倍を達成するためのものであ
る。条件式（１）の下限値を越えて第２群の負の屈折力
が強くなりすぎるとコンパクト化には有利であるが、収
差補正が困難となり、また上限値を越えると収差補正に
は有利であるがレンズ全長が増大することになり好まし
くない。Conditional expression (1) defines the ratio between the focal length of the second lens unit having negative refractive power and the focal length of the entire system at the telephoto end, and achieves a high zoom ratio while mainly shortening the total lens length. It is for. If the lower limit of conditional expression (1) is exceeded and the negative refractive power of the second lens unit becomes too strong, it is advantageous for compactness, but it becomes difficult to correct aberrations, and if it exceeds the upper limit, it is advantageous for aberration correction. However, the total length of the lens increases, which is not preferable.
【００１８】条件式（２）は正の屈折力の第１群の焦点
距離と望遠端の全系の焦点距離との比を規定し、主に望
遠端における第３群のレンズ外径を小さくし、また高変
倍化を容易に達成するものである。条件式（２）の下限
値を越えて第１群の正の屈折力が強くなりすぎると、こ
の第１群で発生する望遠側の収差、特に球面収差が大き
くなり、これを他のレンズ群でバランス良く補正するこ
とが難しくなる。また上限値を越えて第１群の正の屈折
力が弱くなるとコンパクト化が難しくなってくる。Conditional expression (2) defines the ratio of the focal length of the first lens unit having a positive refractive power to the focal length of the entire system at the telephoto end, and mainly reduces the lens outer diameter of the third lens unit at the telephoto end. In addition, a high zoom ratio can be easily achieved. If the lower limit of conditional expression (2) is exceeded and the positive refracting power of the first lens unit becomes too strong, aberrations on the telephoto side, particularly spherical aberration, that occur in this first lens unit will increase. It becomes difficult to correct in a good balance. If the upper limit is exceeded and the positive refractive power of the first lens unit becomes weaker, it becomes difficult to make it compact.
【００１９】条件式（３）は正の屈折力の第４群の焦点
距離と望遠端の全系の焦点距離との比を規定し、主に高
変倍化及びコンパクト化を達成するためのものである。
条件式（３）の下限値を越えて第４群の正の屈折力が強
くなりすぎると、コンパクト化及び高変倍化には有利で
あるが、諸収差、特に像面弯曲が悪化する。また上限値
を越えて第４群の屈折力が弱くなりすぎるとコンパクト
化及び高変倍化が難しくなってくる。Conditional expression (3) defines the ratio of the focal length of the fourth lens unit having a positive refractive power to the focal length of the entire system at the telephoto end, and is mainly used for achieving high zoom ratio and compactness. It is a thing.
When the value exceeds the lower limit of conditional expression (3) and the positive refractive power of the fourth lens unit becomes too strong, it is advantageous for downsizing and high zooming, but various aberrations, particularly curvature of field, deteriorate. If the upper limit is exceeded and the refracting power of the fourth lens unit becomes too weak, it becomes difficult to achieve compactness and high zoom ratio.
【００２０】条件式（４）は広角端から望遠端への変倍
の際の第２群の変倍分担を規定するものであり、第２群
の変倍分担をこの条件式（４）の範囲にすることでコン
パクトで良好な性能を達成することが可能な近軸配置を
得ている。Conditional expression (4) defines the variable power distribution of the second lens unit upon zooming from the wide-angle end to the telephoto end, and the variable power distribution of the second lens unit is expressed by the conditional expression (4). By setting the range, a compact and paraxial arrangement that can achieve good performance has been obtained.
【００２１】条件式（５）は第２群の望遠端における倍
率であり、主にフォーカシングを第２群で良好に行うた
めのものである。この条件を満足することで、広角端か
ら望遠端へのズーミング時の第２群の倍率が等倍をはさ
まないようにしている。これにより無限遠物体から至近
物体へのフォーカシングのとき第２群を常に同一方向へ
繰り出すようにして第２群でフォーカシングをする際の
収差変動を少なくしつつ良好な光学性能を得ている。Conditional expression (5) is a magnification at the telephoto end of the second lens group, and is mainly for favorably performing focusing in the second lens group. By satisfying this condition, the magnification of the second lens unit during zooming from the wide-angle end to the telephoto end is prevented from falling below the unity magnification. As a result, when focusing from an object at infinity to a near object, the second lens unit is always extended in the same direction to obtain good optical performance while reducing aberration fluctuations when focusing with the second lens unit.
【００２２】本発明に係るズームレンズは以上の諸条件
を満足することにより達成されるが、更に広画角化及び
高変倍化を図る際の収差変動を良好に補正し、高い光学
性能を得るには次の諸条件のうちの少なくとも１つを満
足させるのが良い。The zoom lens according to the present invention can be achieved by satisfying the above-mentioned various conditions. However, it is possible to satisfactorily correct the aberration variation when achieving a wider angle of view and a higher zoom ratio, and to obtain high optical performance. In order to obtain it, it is better to satisfy at least one of the following conditions.
【００２３】（２−１）前記第１群は物体側に凸面を向
けたメニスカス状の負レンズと両レンズ面が凸面の正レ
ンズとを接合した貼合わせレンズ、そして物体側に凸面
を向けたメニスカス状の正レンズを有し、前記第２群は
物体側へ凸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、
そして物体側に凹面を向けた負レンズを有していること
である。(2-1) In the first group, a cemented lens in which a negative meniscus lens having a convex surface facing the object side and a positive lens having convex lens surfaces on both sides are cemented together, and the convex surface is directed toward the object side The second lens unit has a meniscus-shaped positive lens, and the second group has a meniscus-shaped negative lens having a convex surface directed toward the object side, a negative lens having both concave lens surfaces, and a positive lens having both convex lens surfaces.
It also has a negative lens with a concave surface facing the object side.
【００２４】これにより、全体的に少ないレンズ枚数で
変倍及びフォーカスに伴う収差変動、例えば球面収差、
コマ収差、非点収差等を良好に補正し全変倍範囲にわた
り高い光学性能を得ている。This makes it possible to reduce aberrations due to zooming and focusing, such as spherical aberration, with a small number of lenses.
It successfully corrects coma and astigmatism, and obtains high optical performance over the entire zoom range.
【００２５】（２−２）前記第３群は少なくとも２枚の
正レンズ、そして物体側に凹面を向けた負レンズを有し
ていることである。(2-2) The third group has at least two positive lenses and a negative lens having a concave surface facing the object side.
【００２６】（２−３）前記第３群はレンズ中心からレ
ンズ周辺にいくに従い正の屈折力が弱くなる形状の非球
面を有していることである。これにより広画角化を図る
際の変倍に伴う収差変動を良好に補正している。(2-3) The third group has an aspherical surface whose positive refractive power becomes weaker from the lens center to the lens periphery. As a result, aberration fluctuations due to zooming when widening the angle of view are satisfactorily corrected.
【００２７】 （２−４）０．２＜ｆ３／ｆＴ＜０．３ ・・・・・・（６） １．２＜ｆ３／ｆｗ＜１．８ ・・・・・・（７） なる条件を満足することである。(2-4) 0.2 <f3 / fT <0.3 (6) 1.2 <f3 / fw <1.8 (7) Is to be satisfied.
【００２８】条件式（６），（７）は各々望遠端、広角
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。条件式（６）又は（７）の下
限値を越えて第３群の正の屈折力が強くなりすぎると、
この第３群で発生する収差が大きくなりすぎ、これを他
のレンズ群でバランス良く補正することが困難になる。
また条件式（６）又は（７）の上限値を越えて第３群の
正の屈折力が弱くなりすぎるとバックフォーカスが長く
なりコンパクト化が難しくなってくる。Conditional expressions (6) and (7) define the ratio of the focal length of the third lens group to the focal length of the entire system at the telephoto end and the wide-angle end, respectively. When the lower limit of conditional expression (6) or (7) is exceeded and the positive refractive power of the third group becomes too strong,
The aberration generated in the third lens unit becomes too large, and it becomes difficult to correct it in a well-balanced manner with other lens units.
Further, when the upper limit of conditional expression (6) or (7) is exceeded and the positive refractive power of the third lens unit becomes too weak, the back focus becomes long and it becomes difficult to make the device compact.
【００２９】（２−５）第４群の正の屈折力の第４１成
分を両レンズ面が凸面の正レンズより構成し、正の屈折
力の第４２成分を物体側に凸面を向けたメニスカス状の
負レンズと両レンズ面が凸面の正レンズを接合した貼合
わせレンズより構成し、負の屈折力の第４３成分を物体
側に凹面を向けた負レンズより構成することである。こ
れにより変倍に伴うコマ収差と球面収差等の諸収差の変
動をバランス良く補正している。(2-5) The 41st component of the positive refracting power of the fourth group is composed of a positive lens whose both lens surfaces are convex surfaces, and the 42nd component of the positive refracting power is a meniscus with its convex surface facing the object side. The negative lens is a cemented lens in which a positive lens having a convex surface on both sides is cemented, and the 43rd component of the negative refracting power is a negative lens having a concave surface facing the object side. As a result, changes in various aberrations such as coma and spherical aberration due to zooming are corrected in a well-balanced manner.
【００３０】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。Next, numerical examples of the present invention will be shown. 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 gap from the object side, and Ni and νi are respectively from the object side of the i-th lens. The refractive index of glass and the Abbe number.
【００３１】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.
【００３２】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、
Ｂ，Ｃ，Ｄ，Ｅ，Ｆ，Ｇを各々非球面係数としたとき、The aspherical shape has an X axis in the optical axis direction, an H axis in the direction perpendicular to the optical axis, a positive light traveling direction, and R as a paraxial radius of curvature,
When B, C, D, E, F and G are aspherical coefficients,
【００３３】[0033]
【数１】 なる式で表わしている。尚、「ｅ−ｘ」は「×10-x」を
表わしている。 （数値実施例１） F= 28.8 〜189.4 FNO= 1:4.0〜5.9 2ω= 73.9°〜13.0° R 1= 142.09 D 1= 2.00 N 1=1.84666 ν 1= 23.9 R 2= 63.74 D 2= 9.40 N 2=1.67000 ν 2= 57.3 R 3= -291.56 D 3= 0.15 R 4= 44.75 D 4= 4.80 N 3=1.61800 ν 3= 63.4 R 5= 86.21 D 5=可変 R 6= 83.47 D 6= 1.20 N 4=1.72600 ν 4= 53.6 R 7= 15.78 D 7= 5.80 R 8= -37.17 D 8= 1.10 N 5=1.80400 ν 5= 46.6 R 9= 50.15 D 9= 0.10 R10= 30.68 D10= 4.60 N 6=1.84666 ν 6= 23.9 R11= -35.10 D11= 0.71 R12= -26.73 D12= 1.10 N 7=1.88300 ν 7= 40.8 R13= 229.33 D13=可変 R14=（絞り） D14= 0.00 R15= 22.87 D15= 3.00 N 8=1.51728 ν 8= 69.6 R16= 96.76 D16= 0.12 R17= 43.13 D17= 2.00 N 9=1.48749 ν 9= 70.2 R18= -211.37 D18= 0.12 R19= 57.72 D19= 2.00 N10=1.72916 ν10= 54.7 R20= 200.80 D20= 1.70 R21= -24.05 D21= 1.20 N11=1.80518 ν11= 25.4 R22= -69.02 D22=可変 R23= 36.28 D23= 4.00 N12=1.51633 ν12= 64.2 R24= -23.65 D24= 0.20 R25= 221.32 D25= 1.20 N13=1.74400 ν14= 44.8 R26= 28.91 D26= 3.00 N14=1.61720 ν14= 54.0 R27= -37.70 D27= 1.33 R28= -24.90 D28= 1.50 N15=1.72600 ν14= 53.6 R29= 132.94 D29=可変 R30=（絞り）[Equation 1] It is expressed by In addition, " ex " represents " x10 -x". (Numerical Example 1) F = 28.8 to 189.4 FNO = 1: 4.0 to 5.9 2ω = 73.9 ° to 13.0 ° R 1 = 142.09 D 1 = 2.00 N 1 = 1.84666 ν 1 = 23.9 R 2 = 63.74 D 2 = 9.40 N 2 = 1.67000 ν 2 = 57.3 R 3 = -291.56 D 3 = 0.15 R 4 = 44.75 D 4 = 4.80 N 3 = 1.61800 ν 3 = 63.4 R 5 = 86.21 D 5 = variable R 6 = 83.47 D 6 = 1.20 N 4 = 1.72600 ν 4 = 53.6 R 7 = 15.78 D 7 = 5.80 R 8 = -37.17 D 8 = 1.10 N 5 = 1.80400 ν 5 = 46.6 R 9 = 50.15 D 9 = 0.10 R10 = 30.68 D10 = 4.60 N 6 = 1.84666 ν 6 = 23.9 R11 = -35.10 D11 = 0.71 R12 = -26.73 D12 = 1.10 N 7 = 1.88300 ν 7 = 40.8 R13 = 229.33 D13 = Variable R14 = (Aperture) D14 = 0.00 R15 = 22.87 D15 = 3.00 N 8 = 1.51728 ν 8 = 69.6 R16 = 96.76 D16 = 0.12 R17 = 43.13 D17 = 2.00 N 9 = 1.48749 ν 9 = 70.2 R18 = -211.37 D18 = 0.12 R19 = 57.72 D19 = 2.00 N10 = 1.72916 ν10 = 54.7 R20 = 200.80 D20 = 1.70 R21 = -24.05 D21 = 1.20 N11 = 1.80518 ν11 = 25.4 R22 = -69.02 D22 = Variable R23 = 36.28 D23 = 4.00 N12 = 1.51633 ν12 = 64.2 R24 = -23.65 D24 = 0.20 R25 = 221.32 D25 = 1.20 N13 = 1.74400 ν14 = 44.8 R26 = 28.91 D26 = 3.00 N14 = 1.61720 ν14 = 54.0 R27 = -37.70 D27 = 1.33 R28 = -2 4.90 D28 = 1.50 N15 = 1.72600 ν14 = 53.6 R29 = 132.94 D29 = Variable R30 = (Aperture)
【００３４】[0034]
【表１】 非球面係数 第27面 B= 3.998e-05 C= 2.721e-08 D= 1.617e-09
E=-8.901e-12 （数値実施例２） F= 28.8 〜179.4 FNO= 1:4.0〜5.9 2ω= 73.9°〜13.8° R 1= 134.03 D 1= 2.00 N 1=1.84666 ν 1= 23.9 R 2= 62.25 D 2= 9.40 N 2=1.67000 ν 2= 57.3 R 3= -288.45 D 3= 0.15 R 4= 43.69 D 4= 4.80 N 3=1.61800 ν 3= 63.4 R 5= 77.80 D 5=可変 R 6= 75.35 D 6= 1.20 N 4=1.72600 ν 4= 53.6 R 7= 14.81 D 7= 5.80 R 8= -33.98 D 8= 1.10 N 5=1.80400 ν 5= 46.6 R 9= 60.68 D 9= 0.10 R10= 31.14 D10= 4.60 N 6=1.84666 ν 6= 23.9 R11= -37.51 D11= 0.71 R12= -26.54 D12= 1.10 N 7=1.88300 ν 7= 40.8 R13= 5739.99 D13=可変 R14=（絞り） D14= 0.00 R15= 26.22 D15= 3.00 N 8=1.51728 ν 8= 69.6 R16= 168.00 D16= 0.12 R17= 42.62 D17= 2.00 N 9=1.48749 ν 9= 70.2 R18= -329.24 D18= 0.12 R19= 49.14 D19= 2.00 N10=1.72916 ν10= 54.7 R20= 236.79 D20= 1.70 R21= -25.25 D21= 1.20 N11=1.80518 ν11= 25.4 R22= -79.40 D22=可変 R23= 76.36 D23= 3.00 N12=1.51633 ν12= 64.2 R24= -25.17 D24= 0.20 R25= 188.45 D25= 1.20 N13=1.74400 ν14= 44.8 R26= 22.51 D26= 4.00 N14=1.61720 ν14= 54.0 R27= -34.61 D27= 2.23 R28= -20.45 D28= 1.50 N15=1.72600 ν14= 53.6 R29= -98.14 D29=可変 R30=（絞り）[Table 1] Aspheric coefficient 27th surface B = 3.998e-05 C = 2.721e-08 D = 1.617e-09
E = -8.901e-12 (Numerical example 2) F = 28.8 to 179.4 FNO = 1: 4.0 to 5.9 2ω = 73.9 ° to 13.8 ° R 1 = 134.03 D 1 = 2.00 N 1 = 1.84666 ν 1 = 23.9 R 2 = 62.25 D 2 = 9.40 N 2 = 1.67000 ν 2 = 57.3 R 3 = -288.45 D 3 = 0.15 R 4 = 43.69 D 4 = 4.80 N 3 = 1.61800 ν 3 = 63.4 R 5 = 77.80 D 5 = variable R 6 = 75.35 D 6 = 1.20 N 4 = 1.72600 ν 4 = 53.6 R 7 = 14.81 D 7 = 5.80 R 8 = -33.98 D 8 = 1.10 N 5 = 1.80400 ν 5 = 46.6 R 9 = 60.68 D 9 = 0.10 R10 = 31.14 D10 = 4.60 N 6 = 1.84666 ν 6 = 23.9 R11 = -37.51 D11 = 0.71 R12 = -26.54 D12 = 1.10 N 7 = 1.88 300 ν 7 = 40.8 R13 = 5739.99 D13 = Variable R14 = (Aperture) D14 = 0.00 R15 = 26.22 D15 = 3.00 N 8 = 1.51728 ν 8 = 69.6 R16 = 168.00 D16 = 0.12 R17 = 42.62 D17 = 2.00 N 9 = 1.48749 ν 9 = 70.2 R18 = -329.24 D18 = 0.12 R19 = 49.14 D19 = 2.00 N10 = 1.72916 ν10 = 54.7 R20 = 236.79 D20 = 1.70 R21 = -25.25 D21 = 1.20 N11 = 1.80518 ν11 = 25.4 R22 = -79.40 D22 = Variable R23 = 76.36 D23 = 3.00 N12 = 1.51633 ν12 = 64.2 R24 = -25.17 D24 = 0.20 R25 = 188.45 D25 = 1.20 N13 = 1.74400 ν14 = 44.8 R26 = 22.51 D26 = 4.00 N14 = 1.61720 ν14 = 54.0 R27 = -34.61 D2 7 = 2.23 R28 = -20.45 D28 = 1.50 N15 = 1.72600 ν14 = 53.6 R29 = -98.14 D29 = Variable R30 = (Aperture)
【００３５】[0035]
【表２】 非球面係数 第29面 B= 1.863e-05 C= 6.005e-08 D=-7.620e-10
E= 7.659e-12 （数値実施例３） F= 28.8 〜195.0 FNO= 1:4.0〜6.0 2ω= 73.9°〜12.7° R 1= 133.28 D 1= 2.00 N 1=1.84666 ν 1= 23.9 R 2= 62.59 D 2= 9.40 N 2=1.67000 ν 2= 57.3 R 3= -290.40 D 3= 0.15 R 4= 43.82 D 4= 4.80 N 3=1.61800 ν 3= 63.4 R 5= 77.93 D 5=可変 R 6= 76.29 D 6= 1.20 N 4=1.72600 ν 4= 53.6 R 7= 14.85 D 7= 5.80 R 8= -32.90 D 8= 1.10 N 5=1.80400 ν 5= 46.6 R 9= 60.94 D 9= 0.10 R10= 32.07 D10= 4.60 N 6=1.84666 ν 6= 23.9 R11= -37.66 D11= 0.71 R12= -26.95 D12= 1.10 N 7=1.88300 ν 7= 40.8 R13=-1111.58 D13=可変 R14=（絞り） D14= 0.00 R15= 25.46 D15= 2.50 N 8=1.51728 ν 8= 69.6 R16=11945.08 D16= 0.12 R17= 31.00 D17= 2.50 N 9=1.48749 ν 9= 70.2 R18= -136.13 D18= 1.82 R19= -25.76 D19= 1.20 N10=1.80518 ν10= 25.4 R20= -66.86 D20=可変 R21= 79.06 D21= 3.00 N11=1.51633 ν11= 64.2 R22= -24.97 D22= 0.20 R23= 165.06 D23= 1.20 N12=1.74400 ν12= 44.8 R24= 23.29 D24= 4.00 N13=1.61720 ν14= 54.0 R25= -40.52 D25= 2.56 R26= -21.01 D26= 1.50 N14=1.72600 ν14= 53.6 R27= -117.21 D27=可変 R28=（絞り）[Table 2] Aspheric coefficient 29th surface B = 1.863e-05 C = 6.005e-08 D = -7.620e-10
E = 7.659e-12 (Numerical example 3) F = 28.8 to 195.0 FNO = 1: 4.0 to 6.0 2 ω = 73.9 ° to 12.7 ° R 1 = 133.28 D 1 = 2.00 N 1 = 1.84666 ν 1 = 23.9 R 2 = 62.59 D 2 = 9.40 N 2 = 1.67000 ν 2 = 57.3 R 3 = -290.40 D 3 = 0.15 R 4 = 43.82 D 4 = 4.80 N 3 = 1.61800 ν 3 = 63.4 R 5 = 77.93 D 5 = Variable R 6 = 76.29 D 6 = 1.20 N 4 = 1.72 600 ν 4 = 53.6 R 7 = 14.85 D 7 = 5.80 R 8 = -32.90 D 8 = 1.10 N 5 = 1.80400 ν 5 = 46.6 R 9 = 60.94 D 9 = 0.10 R10 = 32.07 D10 = 4.60 N 6 = 1.84666 ν 6 = 23.9 R11 = -37.66 D11 = 0.71 R12 = -26.95 D12 = 1.10 N 7 = 1.88 300 ν 7 = 40.8 R13 = -1111.58 D13 = Variable R14 = (Aperture) D14 = 0.00 R15 = 25.46 D15 = 2.50 N 8 = 1.51728 ν 8 = 69.6 R16 = 11945.08 D16 = 0.12 R17 = 31.00 D17 = 2.50 N 9 = 1.48749 ν 9 = 70.2 R18 = -136.13 D18 = 1.82 R19 = -25.76 D19 = 1.20 N10 = 1.80518 ν10 = 25.4 R20 = -66.86 D20 = Variable R21 = 79.06 D21 = 3.00 N11 = 1.51633 ν11 = 64.2 R22 = -24.97 D22 = 0.20 R23 = 165.06 D23 = 1.20 N12 = 1.74400 ν12 = 44.8 R24 = 23.29 D24 = 4.00 N13 = 1.61720 ν14 = 54.0 R25 = -40.52 D25 = 2.56 R26 = -21.01 D26 = 1.50 N14 = 1.72600 ν14 = 53.6 R27 = -117.21 D27 = Variable R28 = (Aperture)
【００３６】[0036]
【表３】 非球面係数 第15面 B=-3.788e-06 C=-1.122e-08 D= 5.977e-12 第27面 B= 2.111e-05 C= 6.875e-08 D=-7.973e-10
E= 8.979e-12[Table 3] Aspheric coefficient 15th surface B = -3.788e-06 C = -1.122e-08 D = 5.977e-12 27th surface B = 2.111e-05 C = 6.875e-08 D = -7.973e-10
E = 8.979e-12
【００３７】[0037]
【表４】 [Table 4]
【００３８】[0038]
【発明の効果】本発明によれば以上のように、４群ズー
ムレンズにおいて、主に変倍に伴う各レンズ群の移動条
件や、各レンズ群の屈折力、そして第２群の変倍比等を
適切に設定することにより広角端の撮影画角が７５度程
度、変倍比６〜７程度の全変倍範囲にわたり、しかも全
画面にわたり高い光学性能を有するズームレンズを達成
することができる。As described above, according to the present invention, in the four-group zoom lens, the moving conditions of each lens group, the refractive power of each lens group, and the zoom ratio of the second group are mainly involved. It is possible to achieve a zoom lens having a wide field of view of about 75 degrees, a zoom ratio of about 6 to 7 and a high optical performance over the entire screen by appropriately setting the above. .
【図１】 本発明の数値実施例１の広角端のズーム位置
のレンズ断面図FIG. 1 is a lens cross-sectional view at a zoom position at a wide-angle end according to Numerical Embodiment 1 of the present invention.
【図２】 本発明の数値実施例２の広角端のズーム位置
のレンズ断面図FIG. 2 is a lens cross-sectional view at a zoom position at a wide-angle end according to Numerical Embodiment 2 of the present invention.
【図３】 本発明の数値実施例３の広角端のズーム位置
のレンズ断面図FIG. 3 is a lens cross-sectional view at a zoom position at a wide-angle end according to Numerical Embodiment 3 of the present invention.
【図４】 本発明の数値実施例１の広角端の収差図FIG. 4 is an aberration diagram at a wide-angle end according to Numerical Example 1 of the present invention.
【図５】 本発明の数値実施例１の望遠端の収差図FIG. 5 is an aberration diagram at a telephoto end according to Numerical Example 1 of the present invention.
【図６】 本発明の数値実施例２の広角端の収差図FIG. 6 is an aberration diagram at a wide-angle end according to Numerical Example 2 of the present invention.
【図７】 本発明の数値実施例２の望遠端の収差図FIG. 7 is an aberration diagram at a telephoto end according to Numerical Example 2 of the present invention.
【図８】 本発明の数値実施例３の広角端の収差図FIG. 8 is an aberration diagram at a wide-angle end according to Numerical Example 3 of the present invention.
【図９】 本発明の数値実施例３の望遠端の収差図FIG. 9 is an aberration diagram at a telephoto end according to Numerical Example 3 of the present invention.
Ｌ１ 第１群 Ｌ２ 第２群 Ｌ３ 第３群 Ｌ４ 第４群 ＳＰ 開口絞り ＳＫ 固定絞り ｄ ｄ線 ｇ ｇ線 Ｓ．Ｃ 正弦条件 Ｓ サジタル像面 Ｍ メリディオナル像面 L1 1st group L2 2nd group L3 3rd group L4 4th group SP Aperture stop SK Fixed stop d d line g g line S.I. C Sine condition S Sagittal image plane M Meridional image plane
Claims (6)
の屈折力の第２群、正の屈折力の第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各レンズ群を物体側へ、該第１群と
第２群の間隔が増加し、該第２群と第３群の間隔が減少
し、該第３群と第４群の間隔が減少するように移動させ
ており、該第４群は正の屈折力の第４１成分、正の屈折
力の第４２成分、そして負の屈折力の第４３成分の３つ
の成分を有し、かつレンズ中心からレンズ周辺にいくに
従い正の屈折力が弱くなる形状の非球面を有しており、
該第ｉ群の焦点距離をｆｉ、広角端と望遠端における全
系の焦点距離を各々ｆｗ，ｆＴ、該第２群の変倍比をＺ
２としたとき ０．０５＜｜ｆ２｜／ｆＴ＜０．０９ ０．３ ＜ ｆ１／ｆＴ ＜０．７ ０．２ ＜ ｆ４／ｆＴ ＜０．４ ３ ＜ Ｚ２ ＜４ なる条件を満足することを特徴とするズームレンズ。1. Four lens groups, in order from the object side, a first group having a positive refractive power, a second group having a negative refractive power, a third group having a positive refractive power, and a fourth group having a positive refractive power. In zooming from the wide-angle end to the telephoto end, each lens unit is moved toward the object side, the distance between the first and second groups increases, and the distance between the second and third groups decreases. The third lens unit and the fourth lens unit are moved so that the distance between them decreases. The fourth lens unit has a positive refractive power 41st component, a positive refractive power 42nd component, and a negative refractive power It has three components of 43 components, and has an aspherical surface with a shape in which the positive refractive power becomes weaker from the lens center to the lens periphery,
The focal length of the i-th group is fi, the focal lengths of the entire system at the wide-angle end and the telephoto end are fw and fT, and the zoom ratio of the second group is Z.
2 is satisfied: 0.05 <| f2 | / fT <0.09 0.3 <f1 / fT <0.7 0.2 <f4 / fT <0.43 <Z2 <4 A zoom lens featuring.
スカス状の負レンズと両レンズ面が凸面の正レンズとを
接合した貼合わせレンズ、そして物体側に凸面を向けた
メニスカス状の正レンズを有し、前記第２群は物体側へ
凸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、そして物
体側に凹面を向けた負レンズを有していることを特徴と
する請求項１のズームレンズ。2. The cemented lens in which a negative meniscus lens having a convex surface facing the object side and a positive lens having a convex surface on both lens surfaces are cemented together, and a meniscus lens having a convex surface facing the object side. The second lens unit has a positive lens, and the second lens unit has a meniscus-shaped negative lens having a convex surface directed toward the object side, a negative lens having both concave lens surfaces, a positive lens having both convex lens surfaces, and a concave surface directed to the object side. The zoom lens according to claim 1, further comprising a negative lens.
ズ、そして物体側に凹面を向けた負レンズを有している
ことを特徴とする請求項１のズームレンズ。3. The zoom lens according to claim 1, wherein the third group includes at least two positive lenses and a negative lens having a concave surface facing the object side.
にいくに従い正の屈折力が弱くなる形状の非球面を有し
ていることを特徴とする請求項１のズームレンズ。4. The zoom lens according to claim 1, wherein the third lens unit has an aspherical surface having a shape in which the positive refracting power becomes weaker from the lens center toward the lens periphery.
レンズ。5. The zoom lens according to claim 1, wherein the condition 0.2 <f3 / fT <0.3 1.2 <f3 / fw <1.8 is satisfied.
の屈折力の第２群、正の屈折力の第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各レンズ群を物体側へ、該第１群と
第２群の間隔が増加し、該第２群と第３群の間隔が減少
し、該第３群と第４群の間隔が減少するように移動させ
ており、フォーカスを第２群を光軸上移動させて行って
おり、該第ｉ群の焦点距離をｆｉ、広角端と望遠端にお
ける全系の焦点距離を各々ｆｗ，ｆＴ、該第２群の変倍
比と望遠端での倍率を各々をＺ２，β２Ｔとしたとき ０．０５＜｜ｆ２｜／ｆＴ＜０．０９ ０．３ ＜ ｆ１／ｆＴ ＜０．７ ０．２ ＜ ｆ４／ｆＴ ＜０．４ ３ ＜ Ｚ２ ＜４ ｜β２Ｔ｜＜１ なる条件を満足することを特徴とするズームレンズ。6. The four lens groups, in order from the object side, a first group having a positive refractive power, a second group having a negative refractive power, a third group having a positive refractive power, and a fourth group having a positive refractive power. In zooming from the wide-angle end to the telephoto end, each lens unit is moved toward the object side, the distance between the first and second groups increases, and the distance between the second and third groups decreases. The third lens unit and the fourth lens unit are moved so as to reduce the distance between them, and the focus is moved by moving the second lens unit on the optical axis. The focal length of the i-th lens unit is fi, the wide-angle end and the telephoto end. When the focal lengths of the entire system at the end are fw and fT, and the zoom ratio of the second group and the magnification at the telephoto end are Z2 and β2T, respectively, 0.05 <| f2 | / fT <0.090 A zoom lens characterized by satisfying the following condition: 3 <f1 / fT <0.7 0.2 <f4 / fT <0.43 <Z2 <4 | β2T | <1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25134394A JP3352248B2 (en) | 1994-09-19 | 1994-09-19 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25134394A JP3352248B2 (en) | 1994-09-19 | 1994-09-19 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0886963A true JPH0886963A (en) | 1996-04-02 |
| JP3352248B2 JP3352248B2 (en) | 2002-12-03 |
Family
ID=17221419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25134394A Expired - Fee Related JP3352248B2 (en) | 1994-09-19 | 1994-09-19 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3352248B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001208970A (en) * | 2000-01-24 | 2001-08-03 | Olympus Optical Co Ltd | Compact high variable power wide-angle zoom lens |
| US6324018B1 (en) | 1999-03-23 | 2001-11-27 | Olympus Optical Co., Ltd. | Zoom lens system |
| US6353505B1 (en) | 1999-05-25 | 2002-03-05 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens system |
| JP2002107628A (en) * | 2000-09-28 | 2002-04-10 | Nikon Corp | Zoom lens |
| JP2002107629A (en) * | 2000-09-28 | 2002-04-10 | Nikon Corp | Zoom lens |
| US6437923B1 (en) | 2001-02-09 | 2002-08-20 | Tamron Co., Ltd. | High zoom ratio lens |
| US6791762B2 (en) | 2002-02-20 | 2004-09-14 | Tamron Co., Ltd. | High zoom ratio lens |
| JP2008003195A (en) * | 2006-06-21 | 2008-01-10 | Tamron Co Ltd | High variable magnification zoom lens |
| JP2008046319A (en) * | 2006-08-15 | 2008-02-28 | Pentax Corp | Telephoto zoom lens system |
-
1994
- 1994-09-19 JP JP25134394A patent/JP3352248B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6324018B1 (en) | 1999-03-23 | 2001-11-27 | Olympus Optical Co., Ltd. | Zoom lens system |
| US6353505B1 (en) | 1999-05-25 | 2002-03-05 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens system |
| JP2001208970A (en) * | 2000-01-24 | 2001-08-03 | Olympus Optical Co Ltd | Compact high variable power wide-angle zoom lens |
| JP4642958B2 (en) * | 2000-01-24 | 2011-03-02 | オリンパス株式会社 | Compact high-magnification wide-angle zoom lens |
| JP2002107628A (en) * | 2000-09-28 | 2002-04-10 | Nikon Corp | Zoom lens |
| JP2002107629A (en) * | 2000-09-28 | 2002-04-10 | Nikon Corp | Zoom lens |
| JP4686835B2 (en) * | 2000-09-28 | 2011-05-25 | 株式会社ニコン | Zoom lens |
| JP4691768B2 (en) * | 2000-09-28 | 2011-06-01 | 株式会社ニコン | Zoom lens |
| US6437923B1 (en) | 2001-02-09 | 2002-08-20 | Tamron Co., Ltd. | High zoom ratio lens |
| US6791762B2 (en) | 2002-02-20 | 2004-09-14 | Tamron Co., Ltd. | High zoom ratio lens |
| JP2008003195A (en) * | 2006-06-21 | 2008-01-10 | Tamron Co Ltd | High variable magnification zoom lens |
| JP2008046319A (en) * | 2006-08-15 | 2008-02-28 | Pentax Corp | Telephoto zoom lens system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3352248B2 (en) | 2002-12-03 |
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