JPH06160715A - Miniature zoom lens - Google Patents
Miniature zoom lensInfo
- Publication number
- JPH06160715A JPH06160715A JP4310281A JP31028192A JPH06160715A JP H06160715 A JPH06160715 A JP H06160715A JP 4310281 A JP4310281 A JP 4310281A JP 31028192 A JP31028192 A JP 31028192A JP H06160715 A JPH06160715 A JP H06160715A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- group
- wide
- object side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143503—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -+-
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は写真用カメラやビデオカ
メラ等に好適なズームレンズに関し、特に負の屈折力を
有するレンズ群が先行する、いわゆるネガティブリード
のレンズ系でありながら小型化を図ったズームレンズに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens suitable for a photographic camera, a video camera or the like, and in particular, it is a so-called negative lead lens system preceded by a lens group having a negative refracting power, and is downsized. For zoom lenses.
【０００２】[0002]
【従来の技術】従来ネガティブリードの小型なズームレ
ンズとして本出願人の提案による特開昭６３−２５６１
３号公報、特開平２−２３８４１７号公報等が知られて
いる。これらは物体側より順に負の屈折力の第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
ズ群の配置にして各レンズ群のレンズ間隔を変えてズー
ミングを行っている。こうしたタイプを採用することに
より、これらの提案以前より良く知られている負正の２
群ズームタイプより小型化を実現している。2. Description of the Related Art A conventional negative lead small-sized zoom lens proposed by the present applicant is disclosed in Japanese Patent Laid-Open No. 63-2561.
No. 3, Japanese Patent Laid-Open No. 2-238417, etc. are known. These are arranged from the object side in order of the first lens group having negative refracting power, the second lens group having positive refracting power, and the third lens group having negative refracting power to change the lens interval of each lens group for zooming. Is going. By adopting these types, the negative and positive 2
It is smaller than the group zoom type.
【０００３】[0003]
【発明が解決しようとしている課題】しかしながら、上
記従来例の負、正、負３群タイプズームレンズでは、負
正２群ズームに比べてレンズ全長は短縮化されているも
のの、レンズ外径という観点からはまだ大きいという欠
点があった。However, in the negative, positive, and negative three-group type zoom lens of the above-mentioned conventional example, the total lens length is shortened as compared with the negative-positive two-group zoom, but from the viewpoint of the lens outer diameter. Had the drawback that it was still big.
【０００４】[0004]
【課題を解決するための手段】そして本発明は、かかる
問題点に鑑みてレンズ外径も短縮され、又、全長の短い
ズームレンズの提供を目的として、この目的を達成する
ために本発明は以下の構成〔１〕あるいは〔２〕又は
〔１〕と〔２〕を特徴としている。In view of the above problems, the present invention aims to provide a zoom lens having a short lens outer diameter and a short overall length. It is characterized by the following configurations [1] or [2] or [1] and [2].
【０００５】〔１〕物体側より順に負の屈折力の第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、前記３つのレンズ群を移動させて広角
端から望遠端への変倍を行う際、少なくとも前記第２レ
ンズ群と第３レンズ群を共に物体側へ移動させ、以下の
条件式を満足するように各レンズ群を構成してレンズ外
径の縮小を図りながら、光学性能の良好なズームレンズ
を提供した。[1] A first lens unit having a negative refracting power, a second lens unit having a positive refracting power, and a third lens unit having a negative refracting power in order from the object side.
When the three lens groups are moved to perform zooming from the wide angle end to the telephoto end, at least the second lens group and the third lens group are both moved to the object side, and the following conditions are provided. By providing each lens unit so as to satisfy the formula and reducing the outer diameter of the lens, a zoom lens having good optical performance is provided.
【０００６】[0006]
【外３】 但し、 ｆW ：ワイド端でのレンズ全系の合成焦点距離、 ｆT ：テレ端でのレンズ全系の合成焦点距離、 ｆi ：第ｉ群の焦点距離、 ｌ1W：ワイド端での第１レンズ群と第２レンズ群の軸上
におけるレンズ面間隔、 ｌ2W：ワイド端での第２レンズ群と第３レンズ群の軸上
におけるレンズ面間隔、 ｆ12W ：ワイド端での第１レンズ群と第２レンズ群の合
成焦点距離である。[Outside 3] However, f W : composite focal length of the entire lens system at the wide end, f T : composite focal length of the entire lens system at the tele end, f i : focal length of the i-th group, l 1W : first focal length at the wide end On-axis lens surface distance between the first lens group and the second lens group, l 2W : On-axis lens surface distance between the second lens group and the third lens group at the wide end, f 12W : First lens at the wide end It is a composite focal length of the lens unit and the second lens unit.
【０００７】〔２〕物体側より順に負の屈折力の第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、前記３つのレンズ群を移動させて広角
端から望遠端への変倍を行う際、少なくとも前記第２レ
ンズ群と第３レンズ群を共に物体側へ移動させ、以下の
条件式を満足するように構成したことを特徴とする小型
のズームレンズを提供した。[2] A first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power in order from the object side.
When the three lens groups are moved to perform zooming from the wide angle end to the telephoto end, at least the second lens group and the third lens group are both moved to the object side, and the following conditions are provided. There is provided a compact zoom lens characterized by being configured to satisfy the formula.
【０００８】[0008]
【外４】 ｅ1W、ｅ2W、ｅ1T、ｅ2Tはそれぞれワイド、テレ端にお
ける第１・２レンズ群、第２・３レンズ群の主点間隔、
ｆ12W 、ｆ12T はそれぞれワイド、テレ端における第１
レンズ群と第２レンズ群の合成焦点距離、ｆ1 、ｆ2 は
それぞれ第１、第２レンズ群の焦点距離、ｆW 、ｆT は
それぞれワイド、テレ端における焦点距離である。[Outside 4] e 1W , e 2W , e 1T , and e 2T are wide, and the distance between the principal points of the first and second lens groups and the second and third lens groups at the tele end, respectively.
f12W and f12T are the first at the wide and tele end, respectively.
Lens group and the composite focal length of the second lens group, f 1, f 2 are first respectively, the focal length of the second lens unit, f W, is f T is a focal length of each wide, tele end.
【０００９】[0009]
【実施例】図１〜図８は各々本発明の数値実施例１〜８
のレンズ断面図である。図中Ｉは負の屈折力の第１レン
ズ群、ＩＩは正の屈折力の第２レンズ群、ＩＩＩは負の
屈折力の第３レンズ群、矢印は広角端から望遠端へ変倍
を行う際の各レンズ群の移動軌跡を示す。1 to 8 are numerical examples 1 to 8 of the present invention.
3 is a lens cross-sectional view of FIG. In the figure, I is the first lens group having negative refracting power, II is the second lens group having positive refracting power, III is the third lens group having negative refracting power, and the arrow changes the magnification from the wide-angle end to the telephoto end. The movement locus of each lens group at the time is shown.
【００１０】本実施例に係るズームレンズは第２レンズ
群ＩＩと第３レンズ群ＩＩＩを共に物体側へ移動させ前
記（１）〜（６）の条件式を満足させている。ここで各
条件式の技術的意味を説明する。In the zoom lens according to the present embodiment, both the second lens group II and the third lens group III are moved to the object side to satisfy the conditional expressions (1) to (6). Here, the technical meaning of each conditional expression will be described.
【００１１】条件式（１）はレンズ全系の焦点距離変倍
範囲の中間焦点距離に対する第１レンズ群の焦点距離に
関するもので、下限を越えて第１レンズ群の負の屈折力
が強くなりすぎると望遠側でのテレ比が大きくなり、テ
レ側でのレンズ全長が増大してくる。又上限値を越えて
第１レンズ群の負の屈折力が弱くなると、所定の変倍比
を得るのに第１レンズ群と第２レンズ群の間隔変化を大
きくしなければならず、ワイド側でのレンズ全長が大き
くなる。Conditional expression (1) relates to the focal length of the first lens group with respect to the intermediate focal length in the focal length variable range of the entire lens system, and the negative refractive power of the first lens group becomes strong beyond the lower limit. If it is too long, the tele ratio on the telephoto side will increase, and the total lens length on the tele side will increase. Further, when the negative refractive power of the first lens group becomes weaker than the upper limit, the change in the distance between the first lens group and the second lens group must be increased in order to obtain a predetermined zoom ratio, and the wide side The total lens length becomes larger.
【００１２】条件式（２）は第２レンズ群の屈折力に関
し、下限値を越えて屈折力が強くなると変倍による収差
変動が大きくなり、特に望遠側での球面収差を良好に補
正するのが難しくなってくる。又上限値を越えて第２レ
ンズ群の屈折力が弱くなるとワイド端、テレ端ともにレ
ンズ全長が大きくなる。Conditional expression (2) relates to the refracting power of the second lens group, and when the refracting power becomes strong beyond the lower limit value, the aberration variation due to zooming becomes large, and particularly the spherical aberration on the telephoto side is favorably corrected. Becomes difficult. If the upper limit is exceeded and the refractive power of the second lens unit becomes weak, the total lens length at both the wide end and the tele end becomes large.
【００１３】条件式（３）は第３レンズ群の屈折力に関
し、下限を越えて屈折力が強くなると第３レンズ群の移
動による変倍作用が大きくなり、すなわち正、負２群ズ
ームの特徴が現われてきてレンズバックが短くなり、第
３レンズ群のレンズ外径が増大する。又上限を越える
と、逆に負正２群ズームの特徴が現われてきてレンズバ
ックが長くなり、レンズ全長が大きくなる傾向となる。Conditional expression (3) relates to the refracting power of the third lens group, and if the refracting power becomes stronger below the lower limit, the zooming effect due to the movement of the third lens group becomes large, that is, the characteristics of the positive and negative two-group zoom. Appears, the lens back becomes shorter, and the lens outer diameter of the third lens group increases. On the other hand, when the value exceeds the upper limit, on the contrary, the characteristics of the negative / positive two-group zoom appear, the lens back becomes long, and the total lens length tends to become large.
【００１４】条件式（４）はワイド端での第１・２レン
ズ群の軸上における面間隔に関し、下限を越えて１・２
群間隔が小さくなると第２レンズ群の変倍作用が小さく
なり正、負２群ズームの傾向となり、バックが短くなり
第３レンズ群のレンズ外径が増大してくる。又上限値を
越えると絞りを第２レンズ群中に配置した場合に第１レ
ンズ群のレンズ外径が増大してしまう。Conditional expression (4) relates to the axial surface spacing of the first and second lens groups at the wide end, and exceeds the lower limit to 1.2.
If the group interval becomes small, the zooming effect of the second lens group will become small, and there will be a tendency for positive and negative two-group zooming, the back will become shorter, and the lens outer diameter of the third lens group will increase. On the other hand, if the upper limit is exceeded, the lens outer diameter of the first lens group will increase when the diaphragm is arranged in the second lens group.
【００１５】条件式（５）は、ワイド端での第２と第３
レンズ群との軸上における面間隔に関し、下限値を越え
て２・３群間隔が小さくなると、負・正の２群ズームタ
イプに近づいてバックフォーカスが長くなり、レンズ全
長が大きくなる傾向となる。また上限を越えて第２・第
３レンズ群間隔が大きくなるとバックフォーカスが短く
なり第３レンズ群のレンズ外径が増大する。Conditional expression (5) is the second and third conditions at the wide end.
Regarding the axial distance between the lens group and the lens group, if the distance between the second and third groups becomes smaller than the lower limit value, the back focus becomes longer and the total lens length tends to become larger, approaching the negative / positive two-group zoom type. . When the upper limit is exceeded and the distance between the second and third lens groups becomes large, the back focus becomes short and the lens outer diameter of the third lens group increases.
【００１６】条件式（６）はワイド端における全系の焦
点距離に対する広角端における第１と第２群の合成焦点
距離に関するもので、下限を越えるとバックフォーカス
が短くなり第３レンズ群のレンズ外径が増大する。又上
限を越えると全長が大きくなる傾向となる。Conditional expression (6) relates to the combined focal length of the first and second lens units at the wide-angle end with respect to the focal length of the entire system at the wide-angle end, and when the lower limit is exceeded, the back focus becomes short and the lens of the third lens unit becomes short. The outer diameter increases. If the upper limit is exceeded, the total length tends to increase.
【００１７】この他、本発明においてはレンズ構成を次
の如く設定するのが良い。それは第１レンズ群は物体側
より順に像側に凹面を向けた少なくとも１枚の負レンズ
と物体側に凸面を向けた少なくとも１枚の正レンズを有
し、第２レンズ群は物体側に凸面を向けた少なくとも２
つのレンズ面と像側に凸面を向けた少なくとも１つのレ
ンズ面を有し、また第２レンズ群の最も物体側のレンズ
は正レンズであり、第３レンズ群は物体側に凹面を向け
た少なくとも一つのレンズ面を有していることである。In addition to the above, in the present invention, the lens configuration may be set as follows. That is, the first lens group has at least one negative lens having a concave surface facing the image side and at least one positive lens having a convex surface facing the object side, and the second lens group has a convex surface facing the object side. At least 2 turned
Lens having at least one lens surface having a convex surface directed toward the image side, the lens closest to the object side in the second lens group is a positive lens, and the third lens group has at least a concave surface directed toward the object side. That is, it has one lens surface.
【００１８】次に条件式（Ａ）、（Ｂ）、（Ｃ）の技術
的な説明を行う。Next, technical explanations of conditional expressions (A), (B) and (C) will be given.
【００１９】条件式（Ａ）は第１レンズ群と第３レンズ
群の屈折力比に関するものであるが、下限を越えると第
３レンズ群の屈折力が強くなり、レンズバックが短くな
り、第３レンズ群のレンズ径が大きくなり、好ましくな
い。一方、上限を越えるとレンズ全長が長くなる傾向と
なる。Conditional expression (A) relates to the refractive power ratio of the first lens group and the third lens group, but if the lower limit is exceeded, the refractive power of the third lens group becomes strong and the lens back becomes short, The lens diameter of the third lens group becomes large, which is not preferable. On the other hand, if the upper limit is exceeded, the total lens length tends to be long.
【００２０】条件式（Ｂ）は各レンズ群のブロック間隔
変化の比に関するもので、上限を越えると第２・３レン
ズ群間隔変化が小さく、１・２群間隔変化が大きくなる
のでレンズ全長が大きくなる傾向となる。更に望ましく
は上限値を６．０にするのが望ましい。また下限を越え
ると小型化には有利であるが、第３レンズ群の移動量が
大きくなりズーム時の収差変動を補正することが困難と
なる。Conditional expression (B) relates to the ratio of the block interval change of each lens group. When the upper limit is exceeded, the second and third lens group interval changes are small and the 1.2 group interval changes are large, so that the total lens length is increased. It tends to grow. It is more desirable to set the upper limit value to 6.0. On the other hand, if the value goes below the lower limit, it is advantageous for downsizing, but the amount of movement of the third lens group becomes large, and it becomes difficult to correct aberration variation during zooming.
【００２１】条件式（Ｃ）はレンズ全系の焦点距離変化
に対する１・２群合成焦点距離変化の比を表わすもので
あり、下限を越えると第２レンズ群の変倍作用が弱くな
り、逆に第３レンズ群が変倍の為屈折力が強くなり、移
動量が大きくなり、ズームによる収差変動を補正するこ
とが困難となる。また上限を越えると第２レンズ群の変
倍作用が強くなりレンズ全長が大きくなり好ましくな
い。Conditional expression (C) represents the ratio of the change of the combined focal length of the first and second lens groups to the change of the focal length of the entire lens system. If the lower limit is exceeded, the zooming action of the second lens unit will weaken, and vice versa. In addition, since the third lens unit has a variable power, the refractive power becomes strong, the amount of movement becomes large, and it becomes difficult to correct the aberration variation due to zooming. On the other hand, if the upper limit is exceeded, the zooming action of the second lens group becomes strong and the total lens length becomes large, which is not preferable.
【００２２】（他の実施例）尚本発明において、フォー
カシングは従来から一般的な第１群で行えるが、特開昭
６４−７４５２１号公報で知られている種々のリヤフォ
ーカス方式が可能である。(Other Embodiments) In the present invention, focusing can be performed by the general first lens group, but various rear focus methods known in Japanese Patent Laid-Open No. 64-75221 are possible. .
【００２３】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.
【００２４】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.
【００２５】[0025]
【外５】 [Outside 5]
【００２６】[0026]
【外６】 [Outside 6]
【００２７】[0027]
【外７】 [Outside 7]
【００２８】[0028]
【外８】 [Outside 8]
【００２９】[0029]
【外９】 [Outside 9]
【００３０】[0030]
【外１０】 [Outside 10]
【００３１】[0031]
【外１１】 [Outside 11]
【００３２】[0032]
【外１２】 [Outside 12]
【００３３】[0033]
【表１】 [Table 1]
【００３４】[0034]
【発明の効果】本発明によれば、前群の如く３つのレン
ズ群の屈折力配置やレンズ構成を特定することにより、
レンズ全系が小型で高性能なズームレンズを達成するこ
とが出来る。According to the present invention, by specifying the refractive power arrangement and lens configuration of three lens groups like the front group,
The entire lens system is compact and a high-performance zoom lens can be achieved.
【図１】本発明に関する数値実施例１のレンズ断面図。FIG. 1 is a lens cross-sectional view of Numerical Example 1 according to the present invention.
【図２】本発明に関する数値実施例２のレンズ断面図。FIG. 2 is a lens cross-sectional view of Numerical Example 2 according to the present invention.
【図３】本発明に関する数値実施例３のレンズ断面図。FIG. 3 is a lens cross-sectional view of Numerical Example 3 according to the present invention.
【図４】本発明に関する数値実施例４のレンズ断面図。FIG. 4 is a lens cross-sectional view of Numerical Example 4 according to the present invention.
【図５】本発明に関する数値実施例５のレンズ断面図。FIG. 5 is a lens cross-sectional view of Numerical example 5 according to the present invention.
【図６】本発明に関する数値実施例６のレンズ断面図。FIG. 6 is a lens cross-sectional view of Numerical Example 6 according to the present invention.
【図７】本発明に関する数値実施例７のレンズ断面図。FIG. 7 is a lens cross-sectional view of Numerical Example 7 according to the present invention.
【図８】本発明に関する数値実施例８のレンズ断面図。FIG. 8 is a lens cross-sectional view of Numerical Example 8 according to the present invention.
【図９】数値実施例１の諸収差図。FIG. 9 is a diagram of various types of aberration in Numerical example 1.
【図１０】数値実施例２の諸収差図。FIG. 10 is a diagram of various types of aberration of Numerical example 2.
【図１１】数値実施例３の諸収差図。FIG. 11 is a diagram of various types of aberration of Numerical example 3.
【図１２】数値実施例４の諸収差図。FIG. 12 is an aberration diagram of Numerical example 4.
【図１３】数値実施例５の諸収差図。FIG. 13 is a diagram of various types of aberration in Numerical example 5.
【図１４】数値実施例６の諸収差図。FIG. 14 is a diagram of various types of aberration of Numerical example 6.
【図１５】数値実施例７の諸収差図。FIG. 15 is a diagram of various types of aberration of Numerical example 7.
【図１６】数値実施例８の諸収差図。FIG. 16 is a diagram of various types of aberration of Numerical example 8.
Ｉ 第１レンズ群 ＩＩ 第２レンズ群 ＩＩＩ 第３レンズ群 ΔＳ サジタル像面 ΔＭ メリディオナル像面 ｄ ｄ線 ｇ ｇ線 I First lens group II Second lens group III Third lens group ΔS Sagittal image surface ΔM Meridional image surface d d line g g line
Claims (3)
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、前記３つのレンズ群を移動させて広角端か
ら望遠端への変倍を行う際、前記第２レンズ群と第３レ
ンズ群を共に物体側へ移動させ、以下の条件式を満足す
るように各レンズ群を構成したことを特徴とする小型の
ズームレンズ。 【外１】 ｆW ：ワイド端におけるレンズ全系の合成焦点距離 ｆT ：テレ端におけるレンズ全系の合成焦点距離 ｆi ：第ｉ群の焦点距離 ｌ1W：ワイド端での第１レンズ群と第２レンズ群の軸上
におけるレンズ面間隔 ｌ2W：ワイド端での第２レンズ群と第３レンズ群の軸上
におけるレンズ面間隔 ｆ12W ：ワイド端での第１レンズ群と第２レンズ群の合
成焦点距離1. A first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power are arranged in this order from the object side, and the three lens groups are moved. When the zooming from the wide-angle end to the telephoto end is performed, the second lens group and the third lens group are both moved to the object side, and each lens group is configured to satisfy the following conditional expression. A small zoom lens. [Outer 1] f W : Composite focal length of the entire lens system at the wide end f T : Composite focal length of the entire lens system at the tele end f i : Focal length of the i-th group l 1W : First lens group and second lens at the wide end Lens surface distance on the axis of the group 1 2W : Lens surface distance on the axis of the second lens group and the third lens group at the wide end f 12W : Synthetic focus of the first lens group and the second lens group at the wide end distance
に凹面を向けた少なくとも１枚の負レンズと物体側に凸
面を向けた少なくとも１枚の正レンズを有し、前記第２
レンズ群は物体側に凸面を向けた少なくとも２つのレン
ズ面と像側に凸面を向けた少なくとも１つのレンズ面を
有し、また第２レンズ群の最も物体側のレンズは正レン
ズであり、前記第３レンズ群は物体側に凹面を向けた少
なくとも一つのレンズ面を有していることを特徴とする
請求項１の小型ズームレンズ。2. The first lens group includes at least one negative lens having a concave surface directed toward the image side and at least one positive lens having a convex surface directed toward the object side, in order from the object side,
The lens group has at least two lens surfaces having a convex surface facing the object side and at least one lens surface having a convex surface facing the image side, and the most object-side lens of the second lens group is a positive lens, The compact zoom lens according to claim 1, wherein the third lens group has at least one lens surface having a concave surface facing the object side.
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、前記３つのレンズ群を移動させて広角端か
ら望遠端への変倍を行う際、少なくとも前記第２レンズ
群と第３レンズ群を共に物体側へ移動させ、以下の条件
式を満足するように構成したことを特徴とする小型のズ
ームレンズ。 【外２】 ｅ1W、ｅ2W、ｅ1T、ｅ2Tはそれぞれワイド、テレ端にお
ける第１・２レンズ群、第２・３レンズ群の主点間隔、
ｆ12W 、ｆ12T はそれぞれワイド、テレ端における第１
レンズ群と第２レンズ群の合成焦点距離、ｆ1 、ｆ2 は
それぞれ第１、第２レンズ群の焦点距離、ｆW 、ｆT は
それぞれワイド、テレ端における焦点距離である。3. A first lens group having negative refracting power, a second lens group having positive refracting power, and a third lens group having negative refracting power in order from the object side, and the three lens groups are moved. At the time of zooming from the wide-angle end to the telephoto end, at least the second lens unit and the third lens unit are both moved to the object side, and the following conditional expression is satisfied. Zoom lens. [Outside 2] e 1W , e 2W , e 1T , and e 2T are wide, and the distance between the principal points of the first and second lens groups and the second and third lens groups at the tele end, respectively.
f12W and f12T are the first at the wide and tele end, respectively.
Lens group and the composite focal length of the second lens group, f 1, f 2 are first respectively, the focal length of the second lens unit, f W, is f T is a focal length of each wide, tele end.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4310281A JP2974522B2 (en) | 1992-11-19 | 1992-11-19 | Small zoom lens |
| US08/153,024 US5574599A (en) | 1992-11-18 | 1993-11-16 | Zoom lens and zooming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4310281A JP2974522B2 (en) | 1992-11-19 | 1992-11-19 | Small zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06160715A true JPH06160715A (en) | 1994-06-07 |
| JP2974522B2 JP2974522B2 (en) | 1999-11-10 |
Family
ID=18003349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4310281A Expired - Fee Related JP2974522B2 (en) | 1992-11-18 | 1992-11-19 | Small zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2974522B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1184244A (en) * | 1997-09-11 | 1999-03-26 | Canon Inc | Zoom lens and projection device using same |
Citations (39)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5478148A (en) * | 1977-12-02 | 1979-06-22 | Asahi Optical Co Ltd | Zoom lens of small distortion aberration |
| JPS5875108A (en) * | 1981-10-28 | 1983-05-06 | Canon Inc | High variable magnification wide-angle zoom lens |
| JPS63271214A (en) * | 1987-04-28 | 1988-11-09 | Canon Inc | Miniature zoom lens |
| JPS6472114A (en) * | 1987-09-11 | 1989-03-17 | Canon Kk | Zoom lens |
| JPH01116615A (en) * | 1987-10-30 | 1989-05-09 | Canon Inc | Variable power range variable zoom lens |
| JPH01284819A (en) * | 1988-05-12 | 1989-11-16 | Minolta Camera Co Ltd | Zoom lens |
| JPH0235406A (en) * | 1988-07-26 | 1990-02-06 | Canon Inc | Variable power optical system having vibrationproof function |
| JPH0263007A (en) * | 1988-08-30 | 1990-03-02 | Ricoh Co Ltd | Small-sized zoom lens |
| JPH0281020A (en) * | 1988-09-19 | 1990-03-22 | Canon Inc | Variable-power optical system with vibration-proof function |
| JPH02158708A (en) * | 1988-12-13 | 1990-06-19 | Canon Inc | Wide angle zoom lens |
| JPH02181715A (en) * | 1989-01-06 | 1990-07-16 | Canon Inc | Zoom lens |
| JPH02201410A (en) * | 1989-01-31 | 1990-08-09 | Canon Inc | Three-group zoom lens |
| JPH02201409A (en) * | 1989-01-31 | 1990-08-09 | Canon Inc | Rear focus type zoom lens |
| JPH02238416A (en) * | 1989-03-10 | 1990-09-20 | Canon Inc | Zoom lens |
| JPH02238417A (en) * | 1989-03-10 | 1990-09-20 | Canon Inc | Zoom lens |
| JPH02238418A (en) * | 1989-03-10 | 1990-09-20 | Canon Inc | Zoom lens |
| JPH0359633A (en) * | 1989-07-28 | 1991-03-14 | Canon Inc | Camera system |
| JPH0359634A (en) * | 1989-07-28 | 1991-03-14 | Canon Inc | Camera system |
| JPH03158816A (en) * | 1989-11-17 | 1991-07-08 | Canon Inc | Zoom lens with simple constitution |
| JPH03168609A (en) * | 1989-11-28 | 1991-07-22 | Minolta Camera Co Ltd | Compact zoom lens |
| JPH03185413A (en) * | 1989-12-15 | 1991-08-13 | Canon Inc | Zoom lens with simplified constitution |
| JPH03197914A (en) * | 1989-01-23 | 1991-08-29 | Ricoh Co Ltd | Zoom lens and focusing method |
| JPH03212607A (en) * | 1990-01-18 | 1991-09-18 | Konica Corp | Zoom lens |
| JPH03212608A (en) * | 1990-01-18 | 1991-09-18 | Konica Corp | Zoom lens |
| JPH03233422A (en) * | 1989-12-22 | 1991-10-17 | Ricoh Co Ltd | Small-sized zoom lens |
| JPH03260611A (en) * | 1990-03-09 | 1991-11-20 | Canon Inc | Zoom lens with simple structure |
| JPH03265811A (en) * | 1990-03-15 | 1991-11-26 | Canon Inc | Zoom lens |
| JPH04406A (en) * | 1990-04-18 | 1992-01-06 | Konica Corp | Zoom lens capable of short-distance photographing |
| JPH0470706A (en) * | 1990-07-11 | 1992-03-05 | Canon Inc | Zoom lens |
| JPH0493812A (en) * | 1990-08-03 | 1992-03-26 | Canon Inc | Variable power lens |
| JPH0493811A (en) * | 1990-08-03 | 1992-03-26 | Canon Inc | Zoom lens with flare stop |
| JPH0497112A (en) * | 1990-08-09 | 1992-03-30 | Olympus Optical Co Ltd | Wide-angle zoom lens |
| JPH04153613A (en) * | 1990-10-17 | 1992-05-27 | Canon Inc | Zoom lens of simple constitution |
| JPH04218013A (en) * | 1990-05-28 | 1992-08-07 | Ricoh Co Ltd | High variable power zoom lens |
| JPH0593866A (en) * | 1991-04-12 | 1993-04-16 | Konica Corp | Zoom lens including wide angle |
| JPH05173074A (en) * | 1991-12-24 | 1993-07-13 | Minolta Camera Co Ltd | Zoom lens |
| JPH05173072A (en) * | 1991-12-19 | 1993-07-13 | Minolta Camera Co Ltd | Zoom lens |
| JPH05181063A (en) * | 1992-01-06 | 1993-07-23 | Olympus Optical Co Ltd | Wide-angle zoom lens |
| JPH0682697A (en) * | 1992-09-01 | 1994-03-25 | Minolta Camera Co Ltd | Zoom lens |
-
1992
- 1992-11-19 JP JP4310281A patent/JP2974522B2/en not_active Expired - Fee Related
Patent Citations (39)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5478148A (en) * | 1977-12-02 | 1979-06-22 | Asahi Optical Co Ltd | Zoom lens of small distortion aberration |
| JPS5875108A (en) * | 1981-10-28 | 1983-05-06 | Canon Inc | High variable magnification wide-angle zoom lens |
| JPS63271214A (en) * | 1987-04-28 | 1988-11-09 | Canon Inc | Miniature zoom lens |
| JPS6472114A (en) * | 1987-09-11 | 1989-03-17 | Canon Kk | Zoom lens |
| JPH01116615A (en) * | 1987-10-30 | 1989-05-09 | Canon Inc | Variable power range variable zoom lens |
| JPH01284819A (en) * | 1988-05-12 | 1989-11-16 | Minolta Camera Co Ltd | Zoom lens |
| JPH0235406A (en) * | 1988-07-26 | 1990-02-06 | Canon Inc | Variable power optical system having vibrationproof function |
| JPH0263007A (en) * | 1988-08-30 | 1990-03-02 | Ricoh Co Ltd | Small-sized zoom lens |
| JPH0281020A (en) * | 1988-09-19 | 1990-03-22 | Canon Inc | Variable-power optical system with vibration-proof function |
| JPH02158708A (en) * | 1988-12-13 | 1990-06-19 | Canon Inc | Wide angle zoom lens |
| JPH02181715A (en) * | 1989-01-06 | 1990-07-16 | Canon Inc | Zoom lens |
| JPH03197914A (en) * | 1989-01-23 | 1991-08-29 | Ricoh Co Ltd | Zoom lens and focusing method |
| JPH02201410A (en) * | 1989-01-31 | 1990-08-09 | Canon Inc | Three-group zoom lens |
| JPH02201409A (en) * | 1989-01-31 | 1990-08-09 | Canon Inc | Rear focus type zoom lens |
| JPH02238416A (en) * | 1989-03-10 | 1990-09-20 | Canon Inc | Zoom lens |
| JPH02238417A (en) * | 1989-03-10 | 1990-09-20 | Canon Inc | Zoom lens |
| JPH02238418A (en) * | 1989-03-10 | 1990-09-20 | Canon Inc | Zoom lens |
| JPH0359633A (en) * | 1989-07-28 | 1991-03-14 | Canon Inc | Camera system |
| JPH0359634A (en) * | 1989-07-28 | 1991-03-14 | Canon Inc | Camera system |
| JPH03158816A (en) * | 1989-11-17 | 1991-07-08 | Canon Inc | Zoom lens with simple constitution |
| JPH03168609A (en) * | 1989-11-28 | 1991-07-22 | Minolta Camera Co Ltd | Compact zoom lens |
| JPH03185413A (en) * | 1989-12-15 | 1991-08-13 | Canon Inc | Zoom lens with simplified constitution |
| JPH03233422A (en) * | 1989-12-22 | 1991-10-17 | Ricoh Co Ltd | Small-sized zoom lens |
| JPH03212607A (en) * | 1990-01-18 | 1991-09-18 | Konica Corp | Zoom lens |
| JPH03212608A (en) * | 1990-01-18 | 1991-09-18 | Konica Corp | Zoom lens |
| JPH03260611A (en) * | 1990-03-09 | 1991-11-20 | Canon Inc | Zoom lens with simple structure |
| JPH03265811A (en) * | 1990-03-15 | 1991-11-26 | Canon Inc | Zoom lens |
| JPH04406A (en) * | 1990-04-18 | 1992-01-06 | Konica Corp | Zoom lens capable of short-distance photographing |
| JPH04218013A (en) * | 1990-05-28 | 1992-08-07 | Ricoh Co Ltd | High variable power zoom lens |
| JPH0470706A (en) * | 1990-07-11 | 1992-03-05 | Canon Inc | Zoom lens |
| JPH0493811A (en) * | 1990-08-03 | 1992-03-26 | Canon Inc | Zoom lens with flare stop |
| JPH0493812A (en) * | 1990-08-03 | 1992-03-26 | Canon Inc | Variable power lens |
| JPH0497112A (en) * | 1990-08-09 | 1992-03-30 | Olympus Optical Co Ltd | Wide-angle zoom lens |
| JPH04153613A (en) * | 1990-10-17 | 1992-05-27 | Canon Inc | Zoom lens of simple constitution |
| JPH0593866A (en) * | 1991-04-12 | 1993-04-16 | Konica Corp | Zoom lens including wide angle |
| JPH05173072A (en) * | 1991-12-19 | 1993-07-13 | Minolta Camera Co Ltd | Zoom lens |
| JPH05173074A (en) * | 1991-12-24 | 1993-07-13 | Minolta Camera Co Ltd | Zoom lens |
| JPH05181063A (en) * | 1992-01-06 | 1993-07-23 | Olympus Optical Co Ltd | Wide-angle zoom lens |
| JPH0682697A (en) * | 1992-09-01 | 1994-03-25 | Minolta Camera Co Ltd | Zoom lens |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1184244A (en) * | 1997-09-11 | 1999-03-26 | Canon Inc | Zoom lens and projection device using same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2974522B2 (en) | 1999-11-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH05173073A (en) | Three-group zoom lens | |
| JPH08304703A (en) | Compact zoom lens | |
| JPH08320435A (en) | Wide-angle zoom lens | |
| JP3066915B2 (en) | Zoom lens | |
| JPH08248312A (en) | Zoom lens | |
| JPH07253542A (en) | Zoom lens | |
| JPH1020193A (en) | Zoom lens | |
| JP3018723B2 (en) | Zoom lens | |
| JPH11223772A (en) | Zoom lens | |
| JPH0921950A (en) | Zoom lens | |
| JPH07234360A (en) | Zoom lens | |
| JP3521541B2 (en) | Zoom lens | |
| JP2862272B2 (en) | Wide-angle zoom lens | |
| JPH11202202A (en) | Zoom lens | |
| JP3412908B2 (en) | Zoom lens | |
| JP3429578B2 (en) | Small rear focus zoom lens | |
| JPS63281113A (en) | Zoom lens | |
| JPH0814654B2 (en) | Small zoom lens | |
| JPH0772390A (en) | Small-sized zoon lens | |
| JP3219574B2 (en) | Zoom lens | |
| JPH10170825A (en) | Compact zoom lens | |
| JP3015167B2 (en) | Wide-angle zoom lens | |
| JP2676367B2 (en) | Small variable focal length lens | |
| JPH07294817A (en) | Zoom lens | |
| JPH11211985A (en) | Zoom lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |