【０００１】[0001]
【産業上の利用分野】本発明はレンズシャッターカメ
ラ、ビデオカメラ等に好適な３つのレンズ群より成るズ
ームレンズに関し、特に各レンズ群のレンズ構成を適切
に設定することにより、収差補正を良好に行うと共にレ
ンズ全長（第１レンズ面から像面までの距離）の短縮化
を図った広角端での撮影画角が７０度程度、変倍比３．
５程度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 composed of three lens groups suitable for a lens shutter camera, a video camera, etc., and particularly, by properly setting the lens configuration of each lens group, aberration correction can be favorably performed. 2. The shooting angle of view at the wide-angle end is about 70 degrees, and the zoom ratio is 3. in order to shorten the total lens length (distance from the first lens surface to the image surface).
The present invention relates to a zoom lens of about 5.
【０００２】[0002]
【従来の技術】最近レンズシャッターカメラ、ビデオカ
メラ等の小型化に伴い、高変倍でしかもレンズ全長の短
い小型のズームレンズが要望されている。2. Description of the Related Art Recently, with the downsizing of lens shutter cameras, video cameras, etc., there has been a demand for a compact zoom lens having a high zoom ratio and a short total lens length.
【０００３】レンズシャッターカメラ用のズームレンズ
として、物体側より順に正の屈折力の第１群と負の屈折
力の第２群の２つのレンズ群で構成し、両レンズ群の間
隔を変えて変倍する所謂２群ズームレンズが、例えば特
開昭５７−２０１２１３号公報、特開昭６０−１７０８
１６号公報、特開昭６０−１９１２１６号公報、特開昭
６２−５６９１７号公報等において提案されている。As a zoom lens for a lens shutter camera, it is composed of two lens groups, a first lens group having a positive refractive power and a second lens group having a negative refractive power in order from the object side, and the distance between both lens groups is changed. So-called two-group zoom lenses for changing the magnification are disclosed, for example, in Japanese Patent Laid-Open Nos. 57-201213 and 60-1708.
No. 16, JP-A-60-191216, JP-A-62-56917, and the like.
【０００４】この２群ズームレンズは変倍時の移動機構
が簡易であるという特長を有している。This two-group zoom lens has a feature that the moving mechanism during zooming is simple.
【０００５】しかしながら主に第２群のみで変倍を行っ
ている為に、変倍比が１．６〜２倍程度であり、高変倍
化を図ろうとするとレンズ系が大型化してくる傾向があ
った。However, since the zooming is mainly performed only by the second lens unit, the zooming ratio is about 1.6 to 2, and the lens system tends to be large in size when trying to achieve high zooming. was there.
【０００６】これに対して２群ズームレンズの正の屈折
力の第１群を２つの正の屈折力のレンズ群に分割し、全
体として正、正、そして負の屈折力のレンズ群の３つの
レンズ群より構成し、第２群と第３群に変倍作用を持た
せて高変倍化を図った３群ズームレンズが、例えば特開
平３−２８２４０９号公報、特開平４−３７８１０号公
報、特開平４−７６５１１号公報、特開平４−２２３４
１９号公報、そして特開平５−２６４９０３号公報等で
提案されている。On the other hand, the first lens group having a positive refractive power of the two-group zoom lens is divided into two lens groups having a positive refractive power, and three lens groups having positive, positive, and negative refractive powers are formed as a whole. A three-group zoom lens composed of two lens groups, in which the second group and the third group have a zooming effect to achieve a high zoom ratio, is disclosed in, for example, JP-A-3-282409 and JP-A-4-37810. Japanese Patent Laid-Open No. 4-76511 and Japanese Patent Laid-Open No. 4-2234.
No. 19 and Japanese Patent Laid-Open No. 5-264903.
【０００７】[0007]
【発明が解決しようとする課題】一般にズームレンズの
小型化を図りつつ高変倍化を図るには、例えば各レンズ
群の屈折力を強めたり、又変倍用の各レンズ群の移動量
を増加させれば良い。Generally, in order to achieve a high zoom ratio while reducing the size of a zoom lens, for example, the refracting power of each lens unit should be increased or the amount of movement of each lens unit for zooming should be increased. You can increase it.
【０００８】しかしながら単にレンズ群の屈折力を強め
たり、又変倍用の各レンズ群の移動量を増加させると、
変倍に伴なう収差変動が増大し、全変倍範囲にわたり良
好なる光学性能が得られず、又レンズ全長が増大し、レ
ンズ系全体が大型化してくるという問題点が生じてく
る。However, if the refractive power of the lens units is simply increased or the amount of movement of each lens unit for zooming is increased,
There arises a problem that the variation of aberration due to zooming increases, good optical performance cannot be obtained over the entire zoom range, the total lens length increases, and the entire lens system increases in size.
【０００９】特に広画角化及び高変倍化を図ろうとする
と前玉レンズ径の有効径が増大してきて、例えばレンズ
バリアを前玉レンズの物体側のカメラ本体に内蔵するの
が大変困難になってくる。Particularly, when an attempt is made to widen the angle of view and increase the zoom ratio, the effective diameter of the front lens is increased, and it becomes very difficult to incorporate the lens barrier in the camera body on the object side of the front lens, for example. Is coming.
【００１０】本発明は全体として３つのレンズ群を有
し、各レンズ群のレンズ構成を適切に設定し、又変倍に
際して各レンズ群を適切に移動させることにより広角端
での撮影画角が７０度程度、変倍比３．５程度の全変倍
範囲にわたり良好なる光学性能を有したレンズ枚数が７
〜８枚程度のレンズ全長の短いコンパクトなズームレン
ズの提供を目的とする。The present invention has three lens groups as a whole, the lens configuration of each lens group is appropriately set, and each lens group is appropriately moved at the time of zooming, whereby the photographing angle of view at the wide-angle end is increased. The number of lenses that have good optical performance over the entire zoom range of about 70 degrees and a zoom ratio of about 3.5 is 7
The objective is to provide a compact zoom lens having a short overall lens length of about 8 lenses.
【００１１】[0011]
【課題を解決するための手段】請求項１の発明のズーム
レンズは、物体側より順に、正の屈折力の第１レンズ
群、正の屈折力の第２レンズ群、負の屈折力の第３レン
ズ群を有し、広角端から望遠端への変倍に際し、該第１
レンズ群、第２レンズ群、第３レンズ群を該第１レンズ
群と第２レンズ群の間隔が増加し、該第２レンズ群と第
３レンズ群の間隔が減少するように何れも物体側へ移動
させ、所定の対角線長の有効画面内に像を形成するズー
ムレンズであって、該第ｉレンズ群の第１レンズ面から
最終レンズ面までの光軸上の長さをＢｉ、広角端と望遠
端における全系の焦点距離を各々ｆＷ，ｆＴ、該有効画
面の対角線長をＹ、広角端における開放ＦナンバーをＦ
Ｗとしたとき、According to another aspect of the present invention, there is provided a zoom lens having a first lens group having a positive refractive power, a second lens group having a positive refractive power, and a second lens group having a negative refractive power in order from the object side. It has three lens groups, and when zooming from the wide-angle end to the telephoto end,
The lens group, the second lens group, and the third lens group are all on the object side so that the distance between the first lens group and the second lens group increases and the distance between the second lens group and the third lens group decreases. Is a zoom lens which forms an image in an effective screen having a predetermined diagonal length by moving to the optical axis length from the first lens surface to the final lens surface of the i-th lens group is Bi, at the wide-angle end. And fW and fT are the focal lengths of the entire system at the telephoto end, Y is the diagonal length of the effective screen,and F is the open F number at the wide-angle end.
When we say W,
【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 the following condition.
【００１２】請求項２の発明は、請求項1の発明におい
て前記第１レンズ群は像面側に凸面を向けたメニスカス
状の負レンズと物体側に凸面を向けたメニスカス状の正
レンズの２つのレンズを有し、前記第２レンズ群は像面
に凸面を向けたメニスカス状の負レンズと、物体側に凸
面を向けたメニスカス状の負レンズそして両レンズ面が
凸面の正レンズを有し、前記第３レンズ群は物体側に凹
面を向けた負レンズと正レンズとを接合した貼合わせレ
ンズを有していることを特徴としている。請求項３の発
明は請求項１の発明において前記第１レンズ群は像面側
に凸面を向けたメニスカス状の負レンズと物体側に凸面
を向けたメニスカス状の正レンズの２つのレンズを有
し、前記第２レンズ群は像面に凸面を向けたメニスカス
状の負レンズと、物体側に凸面を向けたメニスカス状の
負レンズ、両レンズ面が凸面の正レンズそして像面側に
凸面を向けたメニスカス状の正レンズを有し、前記第３
レンズ群は物体側に凹面を向けた負レンズと正レンズと
を接合した貼合わせレンズを有していることを特徴とし
ている。According to a second aspect of the invention, in the first aspect of the invention, the first lens group is composed of a meniscus negative lens having a convex surface facing the image side and a meniscus positive lens having a convex surface facing the object side. The second lens group has a meniscus negative lens whose convex surface faces the image surface, a meniscus negative lens whose convex surface faces the object side, and a positive lens whose both lens surfaces are convex surfaces. The third lens group includes a cemented lens in which a negative lens having a concave surface facing the object side and a positive lens are cemented together. According to a third aspect of the present invention, in the first aspect, the first lens group has two lenses, a negative meniscus lens having a convex surface facing the image side and a positive meniscus lens having a convex surface facing the object side. The second lens group has a meniscus negative lens whose convex surface faces the image surface, a meniscus negative lens whose convex surface faces the object side, a positive lens whose both lens surfaces are convex surfaces, and a convex surface facing the image surface side. A positive meniscus lens directed to the third lens
The lens group is characterized by including a cemented lens in which a negative lens having a concave surface facing the object side and a positive lens are cemented together.
【００１３】請求項４の発明のカメラは請求項１乃至３
いずれか１項のズームレンズを有することを特徴として
いる。The camera of the invention of claim 4 is the camera of claims 1 to 3.
It is characterized by having the zoom lens of any one of the items.
【００１４】[0014]
【００１５】[0015]
【００１６】[0016]
【実施例】図１〜図３は各々本発明の後述する数値実施
例１〜３の広角端のレンズ断面図、図４〜図６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７
〜図９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１０〜図１２は本発明の数値実施例３の広
角端、中間、望遠端の収差図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 are lens cross-sectional views of wide-angle end of Numerical Embodiments 1 to 3 described later of the present invention, and FIGS. Aberration diagram at the end, Fig. 7
9 to 10 are aberration diagrams at the wide-angle end, the middle, and the telephoto end of Numerical Example 2 of the present invention, and FIGS. 10 to 12 are aberration charts at the wide-angle end, the middle, and the telephoto end of Numerical Example 3 of the present invention.
【００１７】図中、Ｌ１は正の屈折力の第１群、Ｌ２は
正の屈折力の第２群、Ｌ３は負の屈折力の第３群、ＳＰ
は絞り、ＩＰは像面である。In the figure, L1 is a first group having a positive refractive power, L2 is a second group having a positive refractive power, L3 is a third group having a negative refractive power, and SP.
Is an aperture and IP is an image plane.
【００１８】矢印は広角端から望遠端への変倍に際する
各レンズ群の移動軌跡を示している。The arrows indicate the loci of movement of the respective lens groups during zooming from the wide-angle end to the telephoto end.
【００１９】本実施例に係るズームレンズは広角端から
望遠端へ変倍を行う際、各図に示すように第１群から第
３群の屈折力を適切に設定し、第１群と第２群との空気
間隔が増加し、第２群と第３群との空気間隔が減少する
ように第１群から第３群を何れも物体側へ移動させてい
る。When zooming from the wide-angle end to the telephoto end, the zoom lens according to the present embodiment sets the refractive powers of the first group to the third group appropriately as shown in each figure, and the first group and the third group. All of the first to third groups are moved to the object side so that the air distance between the second group and the second group increases and the air distance between the second and third groups decreases.
【００２０】これにより第２群と第３群に各々変倍作用
を持たせて所定の変倍比を容易に確保し、且つ変倍に伴
なう収差変動が少なく、高い光学性能のズームレンズを
得ている。With this arrangement, the second and third lens units each have a zooming action to easily secure a predetermined zooming ratio, and there is little aberration variation due to zooming, and a zoom lens having high optical performance. Is getting
【００２１】又、このように広角端から望遠端への変倍
の際、各レンズ群を物体側へ移動させることにより広角
端でのレンズ全長の短縮化を効果的に行っている。Further, in this way, at the time of zooming from the wide-angle end to the telephoto end, each lens unit is moved to the object side, effectively shortening the total lens length at the wide-angle end.
【００２２】即ちレンズ全長が広角側で短く、望遠側で
長くなる屈折力配置としている。That is, the refractive power arrangement is such that the total lens length is short on the wide-angle side and long on the telephoto side.
【００２３】本実施例においてフォーカスは第１群又は
第２群を移動させて行っても良く、また双方を移動させ
て行っても良い。In the present embodiment, focusing may be performed by moving the first group or the second group, or by moving both groups.
【００２４】本発明のズームレンズは図１〜図３に示す
ように、物体側より順に正の屈折力の第１群、正の屈折
力の第２群そして負の屈折力の第３群の３つのレンズ群
を有し、広角端から望遠端への変倍を該第１群，第２群
そして第３群を該第１群と第２群との空気間隔が増加
し、該第２群と第３群との空気間隔が減少するように何
れも物体側へ移動させて行うことを基本構成とし、この
基本構成において前述の（１−１）〜（１−３）に示す
如く各条件式や各レンズ群のレンズ構成を特定したこと
を特徴としている。As shown in FIGS. 1 to 3, the zoom lens of the present invention comprises, in order from the object side, a first group having a positive refractive power, a second group having a positive refractive power, and a third group having a negative refractive power. The zoom lens has three lens groups, and zooming from the wide-angle end to the telephoto end is performed by increasing the air gap between the first group, the second group, and the third group and the second group. The basic configuration is to move all of the groups and the third group to the object side so as to reduce the air gap between them, and in this basic configuration, as described in (1-1) to (1-3) above, It is characterized in that the conditional expression and the lens configuration of each lens group are specified.
【００２５】次に前述の第１発明と第２発明の各条件式
の技術的な意味について説明する。Next, the technical meanings of the conditional expressions of the above-mentioned first invention and second invention will be described.
【００２６】条件式（１ａ），（１ｂ）はイメージサー
クル（有効画面寸法）Ｙに対する広角端の焦点距離ｆＷ
の比に関するものである。上限値を越えると全系の焦点
距離が長くなりすぎ本発明の目的としている広画角化が
難しくなる。また下限値を越えると焦点距離が短くなり
すぎ広画角にはなるが、正，正，負の屈折力のズームタ
イプの光学性質上、バックフォーカスが短くなりレンズ
径が増大してくるので良くない。The conditional expressions (1a) and (1b) are the focal length fW at the wide-angle end with respect to the image circle (effective screen size) Y.
It is related to the ratio of. When the value exceeds the upper limit, the focal length of the entire system becomes too long, which makes it difficult to achieve the wide angle of view that is the object of the present invention. When the value goes below the lower limit, the focal length becomes too short and the angle of view becomes wide, but due to the optical properties of the zoom type with positive, positive, and negative refracting power, the back focus becomes shorter and the lens diameter increases, which is good. Absent.
【００２７】条件式（２ａ），（２ｂ）は全系の焦点距
離の変化に対する第１，第２，第３群の光軸上の厚みの
関係に関する。上限値を越えると各レンズ群のレンズが
厚くなるか焦点距離の変化が小さくなりレンズ系全体の
小型化及び高変倍化が難しくなってくる。また下限値を
越えると焦点距離の変化が大きくなると共に、各レンズ
群の光軸上の厚さが薄くなりすぎて各レンズ群での入射
側のレンズ面と射出側のレンズ面を通る軸外光束の光軸
からの高さに差が少なくなり、軸外収差を良好に補正す
るのが困難になる。Conditional expressions (2a) and (2b) relate to the relationship of the thicknesses of the first, second and third lens units on the optical axis with respect to the change in the focal length of the entire system. If the upper limit is exceeded, the lenses of each lens group will become thicker or the change in focal length will become smaller, making it difficult to miniaturize the entire lens system and achieve high zooming. When the value goes below the lower limit, the change in focal length becomes large, and the thickness of each lens group on the optical axis becomes too thin, and the off-axis passing through the lens surface on the incident side and the lens surface on the exit side in each lens group. The difference in height of the light flux from the optical axis is reduced, and it becomes difficult to satisfactorily correct off-axis aberrations.
【００２８】条件式（３ｂ）はレンズ全系の変倍比と広
角端における開放ＦナンバーＦＷに関するものである。
通常、正，正，負の屈折力の３つのレンズ群より成る３
群ズームレンズでは、絞り径を一定に保つと広角側での
Ｆナンバーが望遠側より明るくなる。その為、絞り径を
一定のまま高変倍化を行うと広角端と望遠端でＦナンバ
ーの変化が大きくなってくる。また望遠端を所定のＦナ
ンバーにすると広角端が大口径になってしまい該収差が
悪化してくる。条件式（３ｂ）はこれらをバランス良く
設定する為のものである。条件式（３ｂ）の上限値を越
えると変倍比が大きくなって広角端が大口径になりすぎ
諸収差の補正が困難になる。また下限値を越えると広角
端で所定のＦナンバーを確保しようとすると変倍比が小
さくなってくるので良くない。Conditional expression (3b) relates to the zoom ratio of the entire lens system and the open F number FW at the wide angle end.
Normally, it consists of three lens groups with positive, positive, and negative refractive power.
In the group zoom lens, if the aperture diameter is kept constant, the F number on the wide angle side becomes brighter than on the telephoto side. Therefore, if the zoom ratio is increased while the aperture diameter is kept constant, the F-number changes greatly at the wide-angle end and the telephoto end. Further, when the telephoto end is set to a predetermined F number, the wide-angle end has a large aperture and the aberration becomes worse. Conditional expression (3b) is for setting these in good balance. If the upper limit of conditional expression (3b) is exceeded, the zoom ratio becomes large and the wide-angle end becomes too large in aperture, making it difficult to correct various aberrations. On the other hand, when the value goes below the lower limit, the zoom ratio becomes small when trying to secure a predetermined F number at the wide-angle end, which is not good.
【００２９】次に第３発明のレンズ構成の特徴について
説明する。第３発明において第２群は少なくとも１つの
負レンズと該正レンズそして１つの非球面を有してお
り、第３群は物体側に凹面を向けた負レンズと正レンズ
とを接合し、かつ１つのレンズ面に非球面を施した貼合
わせレンズを有していることを特徴としている。Next, the features of the lens structure of the third invention will be described. In the third invention, the second group has at least one negative lens, the positive lens, and one aspherical surface, and the third group cements a negative lens having a concave surface toward the object side and a positive lens, and It is characterized by having a cemented lens in which one lens surface has an aspherical surface.
【００３０】第２群を正レンズの物体側に負レンズを有
するレンズ構成とすることで第２群の主点位置を第３群
側に持っていき、これにより望遠端での第２群と第３群
の主点間隔を著しく小さくして高変倍化を容易にしてい
る。また第２群は正の屈折力を有するレンズ群であるが
上記のように負レンズを有している為第２群に所定の正
の屈折力を持たせる為には第２群中の正レンズには強い
正の屈折力にする必要がある。その為、第２群内での収
差発生が大きくなる傾向がある。収差補正の為には多数
のレンズを使っても良いが、本発明では非球面を導入し
て諸収差を良好に補正している。By making the second lens unit a negative lens on the object side of the positive lens unit, the principal point position of the second lens unit is brought to the third lens unit side, so that the second lens unit at the telephoto end becomes the second lens unit. The distance between the principal points of the third lens unit is made extremely small to facilitate high zooming. The second group is a lens group having a positive refracting power, but since it has a negative lens as described above, in order to give the second group a predetermined positive refracting power, a positive group in the second group is used. The lens must have a strong positive refractive power. Therefore, the occurrence of aberration in the second group tends to increase. A large number of lenses may be used for aberration correction, but in the present invention, an aspherical surface is introduced to satisfactorily correct various aberrations.
【００３１】第３群は負の屈折力を有するレンズ群なの
で物体側か像側のどちらか一方は凹レンズ面を有する負
レンズが必要になる。本発明では負レンズの物体側のレ
ンズ面は物体側に凹面を向け、これにより広角端でのデ
ィストーションがプラス側に大きくならないようにして
いる。また第３群を空気レンズを有する複数のレンズよ
り成るレンズ構成にするとレンズ系が大型化してきて、
かつレンズ面反射によるゴーストが増大してくる。Since the third lens group has a negative refractive power, a negative lens having a concave lens surface on either the object side or the image side is required. In the present invention, the lens surface on the object side of the negative lens has a concave surface directed to the object side, so that the distortion at the wide-angle end does not increase to the plus side. In addition, when the third lens unit has a lens configuration including a plurality of lenses having an air lens, the lens system becomes large in size,
And the ghost due to the reflection on the lens surface increases.
【００３２】一方、第３群を負レンズ１枚のレンズ構成
にすると変倍時の色収差変動が大きくなるので高変倍化
が困難になる。そこで本発明では負レンズと正レンズと
を接合した貼合わせレンズより構成し色収差を良好に補
正している。またこの貼合わせレンズは物体側に負レン
ズ、像側に正レンズの配置にして接合レンズ面の曲率が
ゆるくなるようにしている。また第３群中に空気レンズ
を有しない貼合わせレンズだけで構成した場合、変倍時
の収差変動が大きくなって高変倍化が難しくなるので、
この貼合わせレンズの１つのレンズ面に非球面を導入し
て高変倍化の際の収差変動を良好に補正している。On the other hand, if the third lens unit has a lens configuration of one negative lens, the variation of chromatic aberration at the time of zooming becomes large, so that it becomes difficult to achieve a high zoom ratio. Therefore, in the present invention, a negative lens and a positive lens are cemented together to form a cemented lens to satisfactorily correct chromatic aberration. In this cemented lens, a negative lens is arranged on the object side and a positive lens is arranged on the image side so that the cemented lens surface has a gentle curvature. Also, if the third lens group is made up of only cemented lenses that do not have an air lens, the aberration variation during zooming becomes large and it becomes difficult to achieve high zooming.
An aspherical surface is introduced into one lens surface of this cemented lens to satisfactorily correct aberration fluctuations at high zooming.
【００３３】第１，第２，第３発明に係るズームレンズ
は以上のように各要素を設定して構成しているが、第
１，第２，第３発明において更に全変倍範囲にわたり、
また画面全体にわたり高い光学性能を得る為には、次の
諸条件のうち少なくとも１つを満足するのが良い。The zoom lenses according to the first, second, and third inventions are configured by setting the respective elements as described above, but in the first, second, and third inventions, the zoom range further extends over the entire zoom range.
Further, in order to obtain high optical performance over the entire screen, it is preferable to satisfy at least one of the following conditions.
【００３４】（２−１）第ｉ群の焦点距離をｆｉとした
とき、(2-1) When the focal length of the i-th group is fi,
【００３５】[0035]
【数５】なる条件を満足することである。[Equation 5] To satisfy the condition.
【００３６】条件式（４），（５）は変倍比と各レンズ
群の焦点距離の比に関するものである。条件式（４）の
上限値を越えて第１群の焦点距離が短くなり、また第２
群の焦点距離が長くなると第２群と第３群の間隔変化に
よる第３群の変倍作用が弱くなり、高変倍化が困難にな
る。また下限値を越えて第１群の焦点距離が長くなると
第２群の変倍作用が弱くなり変倍の為の各レンズ群の移
動量が大きくなりレンズ全長が増大してくるので良くな
い。The conditional expressions (4) and (5) relate to the ratio between the zoom ratio and the focal length of each lens group. If the upper limit of conditional expression (4) is exceeded and the focal length of the first lens unit becomes short,
When the focal length of the group becomes long, the zooming effect of the third group due to the change in the distance between the second group and the third group becomes weak, and it becomes difficult to achieve high zooming. Further, if the focal length of the first lens unit becomes longer than the lower limit value, the zooming action of the second lens unit becomes weak, the amount of movement of each lens unit for zooming becomes large, and the total lens length increases, which is not preferable.
【００３７】条件式（５）の上限値を越えて第１群の焦
点距離が短くなり、また第３群の負の屈折力が弱くなり
すぎると、第２群と第３群の間隔変化による第３群の変
倍作用が弱くなり高変倍化が困難になる。また下限値を
越えて第３群の負の屈折力が強くなりすぎると、変倍時
の諸収差の変動を補正する為に第３群のレンズ数が増大
してきて第３群の光学全長が厚くなりレンズ沈胴時に小
型化が難しくなってくる。When the upper limit of conditional expression (5) is exceeded and the focal length of the first lens unit becomes too short and the negative refracting power of the third lens unit becomes too weak, the distance between the second lens unit and the third lens unit changes. The zooming action of the third group becomes weak and it becomes difficult to achieve high zooming. If the negative refractive power of the third lens group becomes too strong below the lower limit, the number of lenses in the third lens group will increase in order to correct the variation of various aberrations during zooming, and the total optical length of the third lens group will increase. It becomes thicker and it becomes difficult to downsize when the lens is retracted.
【００３８】（２−２）第１群を物体側より負の第１１
レンズと正の第１２レンズより構成し、第ｉ番目のレン
ズ面の曲率半径をＲｉとしたとき、(2-2) The first lens unit is set to the negative eleventh lens unit from the object side.
When the lens is composed of a lens and a positive 12th lens, and the radius of curvature of the i-th lens surface is Ri,
【００３９】[0039]
【数６】なる条件を満足することである。[Equation 6] To satisfy the condition.
【００４０】条件式（６），（７）は第１群と負の第１
１レンズと正の第１２レンズより成るレトロフォーカス
タイプとし広角端でも十分なバックフォーカスを確保す
るとともに広画角化を図る際の諸収差を良好に補正する
為のものである。The conditional expressions (6) and (7) are the first group and the negative first
This is a retrofocus type consisting of one lens and a twelfth positive lens, and is for ensuring sufficient back focus even at the wide-angle end and satisfactorily correcting various aberrations when widening the angle of view.
【００４１】条件式（６）の上限値を越えると負の第１
１レンズの物体側のレンズ面（Ｒ１面）に十分な負の屈
折力を与えることが困難になり、第３群で発生するディ
ストーションを良好に補正することが困難になる。また
下限値を越えると物体側のレンズ面（Ｒ１面）の曲率が
きつくなりすぎてコマ収差が悪化する。If the upper limit of conditional expression (6) is exceeded, the first negative
It becomes difficult to give a sufficient negative refractive power to the object side lens surface (R1 surface) of one lens, and it becomes difficult to satisfactorily correct the distortion generated in the third lens group. On the other hand, when the value goes below the lower limit, the curvature of the object-side lens surface (R1 surface) becomes too tight and coma becomes worse.
【００４２】条件式（７）の上限値を越えると正の第１
２レンズが物体側に凸面を向けたメニスカス形状になら
なくなり、負の第１１レンズで発生する球面収差を良好
に補正することが困難になる。また下限値を越えると正
の第１２レンズの物体側のレンズ面の曲率がきつくなり
すぎてコマ収差が悪化するので良くない。If the upper limit of conditional expression (7) is exceeded, the first positive value is obtained.
The two lenses no longer have the meniscus shape with the convex surface facing the object side, and it becomes difficult to satisfactorily correct the spherical aberration generated in the negative eleventh lens. On the other hand, if the value goes below the lower limit, the curvature of the object side lens surface of the positive twelfth lens becomes too tight, and coma becomes worse, which is not preferable.
【００４３】（２−３）第１群は像面側に凸面を向けた
メニスカス状の負レンズと物体側に凸面を向けたメニス
カス状の正レンズの２つのレンズを有し、第２群は像面
に凸面を向けたメニスカス状の負レンズと、物体側に凸
面を向けたメニスカス状の負レンズそして両レンズ面が
凸面の正レンズを有し、第３群は物体側に凹面を向けた
負レンズと正レンズとを接合した貼合わせレンズを有し
ていることである。このように各レンズ群のレンズ構成
を特定して、高変倍化を図る際に全変倍範囲にわたり諸
収差の変動及び画面全体の諸収差を良好に補正してい
る。(2-3) The first group has two lenses, a negative meniscus lens having a convex surface directed toward the image side and a positive meniscus lens having a convex surface directed toward the object side. The meniscus negative lens having a convex surface facing the image surface, the meniscus negative lens having a convex surface facing the object side, and the positive lens having a convex surface on both lens surfaces, the third lens group has a concave surface facing the object side. That is, it has a cemented lens in which a negative lens and a positive lens are cemented. In this way, the lens configuration of each lens group is specified, and when achieving high zooming, fluctuations of various aberrations and various aberrations of the entire screen are satisfactorily corrected over the entire zooming range.
【００４４】（２−４）第１群は像面側に凸面を向けた
メニスカス状の負レンズと物体側に凸面を向けたメニス
カス状の正レンズの２つのレンズを有し、第２群は像面
に凸面を向けたメニスカス状の負レンズと、物体側に凸
面を向けたメニスカス状の負レンズ、両レンズ面が凸面
の正レンズそして像面側に凸面を向けたメニスカス状の
正レンズを有し、第３群は物体側に凹面を向けた負レン
ズと正レンズとを接合した貼合わせレンズを有している
ことである。このように各レンズ群のレンズ構成を特定
して、高変倍化を図る際に全変倍範囲にわたり諸収差変
動及び画面全体の諸収差を良好に補正している。(2-4) The first group has two lenses, that is, a negative meniscus lens having a convex surface directed toward the image side and a positive meniscus lens having a convex surface directed toward the object side. A meniscus negative lens with a convex surface facing the image surface, a meniscus negative lens with a convex surface facing the object side, a positive lens with both lens surfaces convex, and a meniscus positive lens with a convex surface facing the image side. The third group is to have a cemented lens in which a negative lens having a concave surface facing the object side and a positive lens are cemented. In this way, when the lens configuration of each lens group is specified to achieve high zooming, various aberration fluctuations and various aberrations of the entire screen are favorably corrected over the entire zooming range.
【００４５】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 in the i-th lens. The refractive index of glass and the Abbe number.
【００４６】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。Table 1 shows the relationship between the above-mentioned conditional expressions and various numerical values in the numerical examples.
【００４７】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、
Ｋ，Ａ，Ｂ，Ｃ，Ｄ，Ｅ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 a direction perpendicular to the optical axis, a positive light traveling direction, and R as a paraxial radius of curvature,
When K, A, B, C, D and E are aspherical coefficients,
【００４８】[0048]
【数７】なる式で表わしている。又「ｅ−０Ｘ」は「１０-X」を
意味している。（数値実施例１） f= 29.00〜101.50 ｆｎｏ= 1:5.70〜 9.60 2ω= 73.4°〜24.1° R 1= -31.00 D 1= 1.02 N 1=1.84666 ν 1= 23.8 R 2= -62.09 D 2= 0.10 R 3= 17.67 D 3= 2.65 N 2=1.78590 ν 2= 44.2 R 4= 32.13 D 4=可変 R 5= （絞り） D 5= 2.00 R 6= -13.50 D 6= 2.07 N 3=1.48749 ν 3= 70.2 R 7= -21.11 D 7= 0.10 R 8= 18.19 D 8= 5.00 N 4=1.84666 ν 4= 23.8 R 9= 12.17 D 9= 4.48 N 5=1.58313 ν 5= 59.4 R10= -17.36 D10=可変 R11= -13.12 D11= 1.00 N 6=1.71300 ν 6= 53.8 R12= 46.99 D12= 2.81 N 7=1.84666 ν 7= 23.8 R13= 192.08 D13=可変[Equation 7] It is expressed by Further, "e-0X" means "10-X ". (Numerical Example 1) f = 29.0 to 10.51 fno = 1: 5.70 to 9.60 2ω = 73.4 ° to 24.1 ° R 1 = -31.00 D 1 = 1.02 N 1 = 1.84666 ν 1 = 23.8 R 2 = -62.09 D 2 = 0.10 R 3 = 17.67 D 3 = 2.65 N 2 = 1.78590 ν 2 = 44.2 R 4 = 32.13 D 4 = Variable R 5 = (Aperture) D 5 = 2.00 R 6 = -13.50 D 6 = 2.07 N 3 = 1.48749 ν 3 = 70.2 R 7 = -21.11 D 7 = 0.10 R 8 = 18.19 D 8 = 5.00 N 4 = 1.84666 ν 4 = 23.8 R 9 = 12.17 D 9 = 4.48 N 5 = 1.58313 ν 5 = 59.4 R10 = -17.36 D10 = variable R11 = -13.12 D11 = 1.00 N 6 = 1.71300 ν 6 = 53.8 R12 = 46.99 D12 = 2.81 N 7 = 1.84666 ν 7 = 23.8 R13 = 192.08 D13 = variable
【００４９】[0049]
【表１】 非球面係数 R10 K=-3.503e+00 A= 0 B= 4.802e-05 C= 5.572e-08 D= 3.663e-09 E= 5.112e-11 R11 K=-8.099e-01 A= 0 B= 8.607e-05 C=-1.031e-07 D=-2.141e-09 E= 7.525e-12（数値実施例２） f= 29.02〜101.66 fno= 1:5.70〜 9.50 2ω= 73.4°〜24.0° R 1= -20.53 D 1= 1.45 N 1=1.84666 ν 1= 23.8 R 2= -26.88 D 2= 0.10 R 3= 13.59 D 3= 3.67 N 2=1.48749 ν 2= 70.2 R 4= 27.88 D 4=可変 R 5= （絞り） D 5= 2.00 R 6= -12.19 D 6= 1.00 N 3=1.48749 ν 3= 70.2 R 7= -19.82 D 7= 0.10 R 8= 17.97 D 8= 5.00 N 4=1.84666 ν 4= 23.8 R 9= 12.17 D 9= 4.60 N 5=1.58313 ν 5= 59.4 R10= -15.26 D10=可変 R11= -11.20 D11= 1.00 N 6=1.69680 ν 6= 55.5 R12= 49.50 D12= 2.76 N 7=1.84666 ν 7= 23.8 R13= 264.88 D13=可変[Table 1] Aspheric surface coefficient R10 K = -3.503e + 00 A = 0 B = 4.802e-05 C = 5.572e-08 D = 3.663e-09 E = 5.112e-11 R11 K = -8.099e-01 A = 0 B = 8.607e-05 C = -1.031e-07 D = -2.141e-09 E = 7.525e-12 (Numerical example 2) f = 29.02 to 101.66 fno = 1: 5.70 to 9.50 2ω = 73.4 ° to 24.0 ° R 1 = -20.53 D 1 = 1.45 N 1 = 1.84666 ν 1 = 23.8 R 2 = -26.88 D 2 = 0.10 R 3 = 13.59 D 3 = 3.67 N 2 = 1.48749 ν 2 = 70.2 R 4 = 27.88 D 4 = Variable R 5 = (Aperture) D 5 = 2.00 R 6 = -12.19 D 6 = 1.00 N 3 = 1.48749 ν 3 = 70.2 R 7 = -19.82 D 7 = 0.10 R 8 = 17.97 D 8 = 5.00 N 4 = 1.84666 ν 4 = 23.8 R 9 = 12.17 D 9 = 4.60 N 5 = 1.58313 ν 5 = 59.4 R10 = -15.26 D10 = variable R11 = -11.20 D11 = 1.00 N 6 = 1.69680 ν 6 = 55.5 R12 = 49.50 D12 = 2.76 N 7 = 1.84666 ν 7 = 23.8 R13 = 264.88 D13 = variable
【００５０】[0050]
【表２】 非球面係数 R 1 K=-1.122e+00 A= 0 B=-1.032e-05 C=-4.259e-08 D= 9.933e-10 E=-7.111e-12 R10 K=-3.953e+00 A= 0 B= 4.227e-05 C=-5.311e-07 D= 5.157e-08 E=-4.335e-10 R11 K=-8.689e-01 A= 0 B= 9.190e-05 C=-7.981e-08 D=-6.962e-10 E= 5.469e-12（数値実施例３） f= 29.00〜101.50 fno= 1:5.70〜 9.65 2ω= 73.4°〜24.1° R 1= -26.94 D 1= 1.75 N 1=1.84666 ν 1= 23.8 R 2= -38.05 D 2= 0.10 R 3= 16.87 D 3= 2.22 N 2=1.48749 ν 2= 70.2 R 4= 39.43 D 4=可変 R 5= （絞り） D 5= 1.70 R 6= -12.88 D 6= 1.00 N 3=1.48749 ν 3= 70.2 R 7= -47.93 D 7= 0.10 R 8= 19.05 D 8= 4.79 N 4=1.84666 ν 4= 23.8 R 9= 14.49 D 9= 0.10 R10= 16.08 D10= 2.55 N 5=1.58313 ν 5= 59.4 R11= -26.35 D11= 0.10 R12= -40.55 D12= 2.06 N 6=1.48749 ν 6= 70.2 R13= -13.57 D13=可変 R14= -14.89 D14= 1.00 N 7=1.69680 ν 7= 55.5 R15= 48.27 D15= 2.21 N 8=1.84666 ν 7= 23.8 R16= 105.97[Table 2] Aspheric surface coefficient R 1 K = -1.122e + 00 A = 0 B = -1.032e-05 C = -4.259e-08 D = 9.933e-10 E = -7.111e-12 R10 K = -3.953e + 00 A = 0 B = 4.227e-05 C = -5.311e-07 D = 5.157e-08 E = -4.335e-10 R11 K = -8.689e-01 A = 0 B = 9.190e-05 C = -7.981 e-08 D = -6.962e-10 E = 5.469e-12 (Numerical example 3) f = 29.0 to 10.51 fno = 1: 5.70 to 9.65 2ω = 73.4 ° to 24.1 ° R 1 = -26.94 D 1 = 1.75 N 1 = 1.84666 ν 1 = 23.8 R 2 = -38.05 D 2 = 0.10 R 3 = 16.87 D 3 = 2.22 N 2 = 1.48749 ν 2 = 70.2 R 4 = 39.43 D 4 = Variable R 5 = (Aperture) D 5 = 1.70 R 6 = -12.88 D 6 = 1.00 N 3 = 1.48749 ν 3 = 70.2 R 7 = -47.93 D 7 = 0.10 R 8 = 19.05 D 8 = 4.79 N 4 = 1.84666 ν 4 = 23.8 R 9 = 14.49 D 9 = 0.10 R10 = 16.08 D10 = 2.55 N 5 = 1.58313 ν 5 = 59.4 R11 = -26.35 D11 = 0.10 R12 = -40.55 D12 = 2.06 N 6 = 1.48749 ν 6 = 70.2 R13 = -13.57 D13 = variable R14 = -14.89 D14 = 1.00 N 7 = 1.69680 ν 7 = 55.5 R15 = 48.27 D15 = 2.21 N 8 = 1.84666 ν 7 = 23.8 R16 = 105.97
【００５１】[0051]
【表３】 非球面係数 R 1 K=-1.482e+00 A= 0 B=-4.874e-06 C=-4.321e-08 D= 9.441e-10 E=-6.171e-12 R11 K=-3.516e+00 A= 0 B= 1.124e-04 C=-2.428e-07 D= 2.645e-08 E=-4.558e-10 R14 K=-4.686e-01 A= 0 B= 7.176e-05 C= 2.504e-07 D=-2.664e-09 E= 7.357e-12[Table 3] Aspheric coefficient R 1 K = -1.482e + 00 A = 0 B = -4.874e-06 C = -4.321e-08 D = 9.441e-10 E = -6.171e-12 R11 K = -3.516e + 00 A = 0 B = 1.124e-04 C = -2.428e-07 D = 2.645e-08 E = -4.558e-10 R14 K = -4.686e-01 A = 0 B = 7.176e-05 C = 2.504e -07 D = -2.664e-09 E = 7.357e-12
【００５２】[0052]
【表４】[Table 4]
【００５３】[0053]
【発明の効果】本発明によれば以上のように、全体とし
て３つのレンズ群を有し、各レンズ群のレンズ構成を適
切に設定し、又変倍に際して各レンズ群を適切に移動さ
せることにより広角端での撮影画角が７０度程度、変倍
比３．５程度の全変倍範囲にわたり良好なる光学性能を
有したレンズ枚数が７〜８枚程度のレンズ全長の短いコ
ンパクトな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, three lens groups are provided as a whole, the lens configuration of each lens group is appropriately set, and each lens group is appropriately moved during zooming. Due to this, a compact zoom lens with a short total lens length of about 7 to 8 lenses that has good optical performance over the entire zoom range with a shooting angle of view at the wide-angle end of about 70 degrees and a zoom ratio of about 3.5. Can be achieved.
【図１】 本発明の数値実施例１の広角端のレンズ断面
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の広角端のレンズ断面
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３の広角端のレンズ断面
図FIG. 3 is a lens cross-sectional view at a wide-angle end according to Numerical Example 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の中間の収差図FIG. 5 is an intermediate aberration diagram of Numerical example 1 of the present invention.
【図６】 本発明の数値実施例１の望遠端の収差図FIG. 6 is an aberration diagram at a telephoto end according to Numerical Example 1 of the present invention.
【図７】 本発明の数値実施例２の広角端の収差図FIG. 7 is an aberration diagram at the wide-angle end according to Numerical Example 2 of the present invention.
【図８】 本発明の数値実施例２の中間の収差図FIG. 8 is an intermediate aberration diagram of Numerical example 2 of the present invention.
【図９】 本発明の数値実施例２の望遠端の収差図FIG. 9 is an aberration diagram at a telephoto end according to Numerical Example 2 of the present invention.
【図１０】 本発明の数値実施例３の広角端の収差図FIG. 10 is an aberration diagram at a wide-angle end according to Numerical Example 3 of the present invention.
【図１１】 本発明の数値実施例３の中間の収差図FIG. 11 is an intermediate aberration diagram of Numerical Example 3 of the present invention.
【図１２】 本発明の数値実施例３の望遠端の収差図FIG. 12 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 groupL2 second groupL3 third groupSP apertureIP image planed d lineg g lineΔS sagittal image planeΔM meridional image plane
フロントページの続き (56)参考文献 特開 昭63−161423（ＪＰ，Ａ) 特開 昭63−153511（ＪＰ，Ａ) 特開 昭58−184916（ＪＰ，Ａ) 特開 平８−152559（ＪＰ，Ａ) 特開 平８−146297（ＪＰ，Ａ) 特開 平８−136809（ＪＰ，Ａ) 特開 平８−122714（ＪＰ，Ａ) 特開 平８−101342（ＪＰ，Ａ) 特開 平８−101341（ＪＰ，Ａ) 特開 平８−82769（ＪＰ，Ａ) 特開 平７−244258（ＪＰ，Ａ) 特開 平７−239441（ＪＰ，Ａ) 特開 平７−225339（ＪＰ，Ａ) 特開 平７−225336（ＪＰ，Ａ) 特開 平７−218836（ＪＰ，Ａ) 特開 平７−199070（ＪＰ，Ａ) 特開 平７−181388（ＪＰ，Ａ) 特開 平７−128594（ＪＰ，Ａ) 特開 平７−120678（ＪＰ，Ａ) 特開 平７−120677（ＪＰ，Ａ) 特開 平７−43612（ＪＰ，Ａ) 特開 平６−294932（ＪＰ，Ａ) 特開 平６−281863（ＪＰ，Ａ) 特開 平６−273669（ＪＰ，Ａ) 特開 平６−265827（ＪＰ，Ａ) 特開 平６−265787（ＪＰ，Ａ) 特開 平６−230284（ＪＰ，Ａ) 特開 平６−194573（ＪＰ，Ａ) 特開 平６−123835（ＪＰ，Ａ) 特開 平６−95039（ＪＰ，Ａ) 特開 平６−75192（ＪＰ，Ａ) 特開 平６−75166（ＪＰ，Ａ) 特開 平６−67093（ＪＰ，Ａ) 特開 平６−67092（ＪＰ，Ａ) 特開 平５−264903（ＪＰ，Ａ) 特開 平５−188296（ＪＰ，Ａ) 特開 平５−173069（ＪＰ，Ａ) 特開 平５−173068（ＪＰ，Ａ) 特開 平５−150161（ＪＰ，Ａ) 特開 平５−113539（ＪＰ，Ａ) 特開 平５−107478（ＪＰ，Ａ) 特開 平５−88085（ＪＰ，Ａ) 特開 平５−72476（ＪＰ，Ａ) 特開 平５−27176（ＪＰ，Ａ) 特開 平４−362910（ＪＰ，Ａ) 特開 平４−338910（ＪＰ，Ａ) 特開 平４−303809（ＪＰ，Ａ) 特開 平４−260016（ＪＰ，Ａ) 特開 平４−223419（ＪＰ，Ａ) 特開 平４−95912（ＪＰ，Ａ) 特開 平４−78814（ＪＰ，Ａ) 特開 平４−78813（ＪＰ，Ａ) 特開 平４−78812（ＪＰ，Ａ) 特開 平４−78811（ＪＰ，Ａ) 特開 平４−78810（ＪＰ，Ａ) 特開 平４−76511（ＪＰ，Ａ) 特開 平４−67114（ＪＰ，Ａ) 特開 平４−37810（ＪＰ，Ａ) 特開 平３−282409（ＪＰ，Ａ) 特開 平３−257412（ＪＰ，Ａ) 特開 平３−241306（ＪＰ，Ａ) 特開 平３−127011（ＪＰ，Ａ) 特開 平３−127010（ＪＰ，Ａ) 特開 平３−127009（ＪＰ，Ａ) 特開 平３−127008（ＪＰ，Ａ) 特開 平３−45916（ＪＰ，Ａ) 特開 平３−31809（ＪＰ，Ａ) 特開 平３−17609（ＪＰ，Ａ) 特開 平２−135312（ＪＰ，Ａ) 特開 平２−103014（ＪＰ，Ａ) 特開 平２−50117（ＪＰ，Ａ) 特開 平２−16516（ＪＰ，Ａ) 特開 平２−16515（ＪＰ，Ａ) 特開 平１−314218（ＪＰ，Ａ) 特開 平１−252917（ＪＰ，Ａ) 特開 平１−252916（ＪＰ，Ａ) 特開 平１−230013（ＪＰ，Ａ) 特開 平１−204013（ＪＰ，Ａ) 特開 平１−93713（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 15/20Continuation of the front page (56) Reference JP-A 63-161423 (JP, A) JP-A 63-153511 (JP, A) JP-A 58-184916 (JP, A) JP-A 8-152559 (JP , A) JP 8-146297 (JP, A) JP 8-136809 (JP, A) JP 8-122714 (JP, A) JP 8-101342 (JP, A) JP 8-101341 (JP, A) JP 8-82769 (JP, A) JP 7-244258 (JP, A) JP 7-239441 (JP, A) JP 7-225339 (JP, A) JP 7-225336 (JP, A) JP 7-218836 (JP, A) JP 7-199070 (JP, A) JP 7-181388 (JP, A) JP 7 -128594 (JP, A) JP-A-7-120678 (JP, A) JP-A-7-120677 (JP, A) JP-A-7-43612 (JP, A) JP-A-6-294932 (JP, A) ) JP-A-6-281863 (JP, A) JP-A-6-273669 (JP, A) JP-A-6-26582 7 (JP, A) JP-A-6-265787 (JP, A) JP-A-6-230284 (JP, A) JP-A-6-194573 (JP, A) JP-A-6-123835 (JP, A) JP-A-6-95039 (JP, A) JP-A-6-75192 (JP, A) JP-A-6-75166 (JP, A) JP-A-6-67093 (JP, A) JP-A-6-67092 (JP, A) JP 5-264903 (JP, A) JP 5-188296 (JP, A) JP 5-173069 (JP, A) JP 5-173068 (JP, A) Kaihei 5-150161 (JP, A) JP 5-1-113539 (JP, A) JP 5-107478 (JP, A) JP 5-88085 (JP, A) JP 5-72476 ( JP, A) JP 5-27176 (JP, A) JP 4-362910 (JP, A) JP 4-338910 (JP, A) JP 4-303809 (JP, A) JP JP-A-4-260016 (JP, A) JP-A-4-223419 (JP, A) JP-A-4-95912 (JP, A) JP-A-4- 78814 (JP, A) JP 4-78813 (JP, A) JP 4-78812 (JP, A) JP 4-78811 (JP, A) JP 4-78810 (JP, A) JP-A-4-76511 (JP, A) JP-A-4-67114 (JP, A) JP-A-4-37810 (JP, A) JP-A-3-282409 (JP, A) JP-A-3-257412 (JP, A) JP-A-3-241306 (JP, A) JP-A-3-127011 (JP, A) JP-A-3-127010 (JP, A) JP-A-3-127009 (JP, A) Kaihei 3-127008 (JP, A) JP 3-45916 (JP, A) JP 3-31809 (JP, A) JP 3-17609 (JP, A) JP 2-135312 ( JP, A) JP 2-103014 (JP, A) JP 2-50117 (JP, A) JP 2-16516 (JP, A) JP 2-16515 (JP, A) JP JP-A-1-314218 (JP, A) JP-A-1-252917 (JP, A) JP-A-1-252916 (JP, A) JP-A-1- 230013 (JP, A) JP 1-204013 (JP, A) JP 1-93713 (JP, A) (58) Fields investigated (Int. Cl.7 , DB name) G02B 15/20
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33605994AJP3412939B2 (en) | 1994-12-22 | 1994-12-22 | Zoom lens |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33605994AJP3412939B2 (en) | 1994-12-22 | 1994-12-22 | Zoom lens |
| Publication Number | Publication Date |
|---|---|
| JPH08179215A JPH08179215A (en) | 1996-07-12 |
| JP3412939B2true JP3412939B2 (en) | 2003-06-03 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33605994AExpired - Fee RelatedJP3412939B2 (en) | 1994-12-22 | 1994-12-22 | Zoom lens |
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| JP (1) | JP3412939B2 (en) |
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| JP3478637B2 (en) | Small zoom lens | |
| JP3506691B2 (en) | High magnification zoom lens | |
| JP3412939B2 (en) | Zoom lens | |
| JPH09184982A (en) | Zoom lens | |
| JPH05173071A (en) | Wide angle zoom lens | |
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| JP3173277B2 (en) | Zoom lens | |
| JP5006514B2 (en) | Zoom lens and imaging apparatus having the same | |
| JP2001194586A (en) | Zoom lens and photographing device using the same | |
| JPH06175024A (en) | Rear focus type zoom lens | |
| JP2006058584A (en) | Zoom lens and imaging apparatus having the same | |
| JP4708734B2 (en) | Zoom lens and imaging apparatus having the same | |
| JPH0876015A (en) | Zoom lens | |
| JPH05323194A (en) | Rear focus type zoom lens | |
| JP3363688B2 (en) | Zoom lens | |
| JP3368099B2 (en) | Rear focus zoom lens | |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |