JP2974522B2 - Small zoom lens - Google Patents
Small zoom lensInfo
- Publication number
- JP2974522B2 JP2974522B2 JP4310281A JP31028192A JP2974522B2 JP 2974522 B2 JP2974522 B2 JP 2974522B2 JP 4310281 A JP4310281 A JP 4310281A JP 31028192 A JP31028192 A JP 31028192A JP 2974522 B2 JP2974522 B2 JP 2974522B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- wide
- group
- angle end
- 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.)
- Expired - Fee Related
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)
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, and the like, and more particularly to a so-called negative lead lens system which is preceded by a lens group having a negative refractive power. Related to zoom lens.
【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 compact zoom lens proposed by the present applicant is disclosed in Japanese Patent Application Laid-Open No. 63-2561.
No. 3, JP-A-2-238417 and the like are known. These are arranged, in order from the object side, as 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. Is going. By adopting such a type, a negative-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 above-described conventional negative, positive, and negative three-group type zoom lens, although the overall length of the lens is shortened as compared with the negative and positive two-group zoom lens, the viewpoint of the lens outer diameter is reduced. Had the disadvantage of still being large.
【０００４】[0004]
【課題を解決するための手段】本発明はかかる問題点に
鑑みてなされたもので、レンズ外径の小型化を図った全
長の短いズームレンズの提供を目的として、以下のよう
な構成を特徴としている。 SUMMARY OF THE INVENTION The present invention addresses such problems.
It was made in consideration of this, and the entire lens diameter was reduced.
To provide a short zoom lens,
It is characterized by a simple configuration.
【０００５】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レンズ群を互いの間隔を変えながら共に物体側
に移動させるズームレンズであって、前記第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、前記第２レンズ群は、物体側より順
に、両凸正レンズ、正レンズ、両凹負レンズ、凸レンズ
の４枚の単レンズより成り、前記第３レンズ群は物体側
に凹面を向けた少なくとも１枚の負レンズを有すると共
に、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。In order from the object side, there are 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. when performing zooming to the telephoto end from the wide-angle end, a zoom lens Before moving at least the second lens group and the third lens group on both the object side while changing the distance therebetween, said first lens group
Are, in order from the object side, at least one concave surface facing the image side.
At least one negative lens and a convex surface facing the object side
A positive lens, and the second lens group is arranged in order from an object side.
, Biconvex positive lens, positive lens, biconcave negative lens, convex lens
Wherein the third lens group is located on the object side.
Having at least one negative lens with a concave surface facing
Further, a zoom lens having good optical performance was provided while reducing the lens outer diameter by configuring each lens group so as to satisfy the following conditional expressions.
【０００６】[0006]
【外３】 但し、 ｆW：広角端でのレンズ全系の合成焦点距離、 ｆT：望遠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：広角端での第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：広角端での第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：広角端での第１レンズ群と第２レンズ群の合成
焦点距離、ｆ 12T ：望遠端での第１レンズ群と第２レンズ群の合成
焦点距離、 ｅ 1W ：広角端での第１レンズ群と第２レンズ群の主点間
隔、 ｅ 1T ：望遠端での第１レンズ群と第２レンズ群の主点間
隔、 ｅ 2W ：広角端での第２レンズ群と第３レンズ群の主点間
隔、 ｅ 2T ：望遠端での第２レンズ群と第３レンズ群の主点間
隔、 である。[Outside 3] Where f W : the combined focal length of the entire lens system at the wide-angle end, f T : the combined focal length of the entire lens system at the telephoto end, f i : the focal length of the i-th lens unit, and l 1W : the first at the wide-angle end. lens group and the lens surface spacing on an axis of the second lens group, l 2W: distance between lens surfaces on an axis of the second lens group and the third lens unit at the wide angle end, f 12W: the first lens unit at the wide angle end When the composite focal length of the second lens group, f 12T: the first lens group and the second lens group at the telephoto end synthesis
Focal length, e 1W : between principal points of the first and second lens groups at the wide-angle end
Distance, e 1T : between principal points of the first lens unit and the second lens unit at the telephoto end
Separation, e 2W : between principal points of the second and third lens groups at the wide-angle end
Distance, e 2T : between principal points of the second and third lens groups at the telephoto end
Distant .
【０００７】[0007]
【０００８】[0008]
【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 show numerical examples 1 to 8 of the present invention.
It is a lens sectional view of. In the figure, I is a first lens group having a negative refractive power, II is a second lens group having a positive refractive power, III is a third lens group having a negative refractive power, and an arrow performs zooming 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を互いの間隔を変えながら
共に物体側へ移動させ、前記（１）〜（９）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, the second lens group II and the third lens group III are moved to the object side while changing the distance between them , and the conditions (1) to (9) are satisfied. We are satisfied with expression. 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。The conditional expression (1) relates to the focal length of the first lens unit with respect to the intermediate focal length of the focal length variable range of the entire lens system. When the value exceeds the lower limit, the negative refractive power of the first lens unit becomes strong. If too long, the telephoto ratio on the telephoto side increases, and the overall length of the lens on the telephoto side increases. If the negative refractive power of the first lens unit is weakened beyond the upper limit, the change in the distance between the first lens unit and the second lens unit must be increased in order to obtain a predetermined zoom ratio. 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 refractive power of the second lens group. If the refractive power exceeds the lower limit and the refractive power becomes strong, the aberration variation due to zooming becomes large, and the spherical aberration on the telephoto side is particularly well corrected. Becomes more difficult. If the refractive power of the second lens group becomes weaker than the upper limit, the total lens length at both the wide end and the telephoto end increases.
【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 refractive power of the third lens unit. When the refractive power exceeds the lower limit and the refractive power becomes stronger, the zooming effect due to the movement of the third lens unit increases. Appear, the lens back becomes shorter, and the lens outer diameter of the third lens group increases. If the upper limit is exceeded, on the contrary, the characteristic of the negative / positive two-unit zoom appears, the lens back becomes longer, and the overall length of the lens tends to become larger.
【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。Condition (4) relates to the on-axis surface distance of the first and second lens units at the wide-angle end.
When the distance between the groups is reduced, the zooming action of the second lens group is reduced, and a positive and negative two-group zoom tends to occur. If the upper limit is exceeded, the lens outer diameter of the first lens group will increase when the stop 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) satisfies the second and third conditions at the wide end.
With respect to the on-axis surface distance between the lens unit and the lens unit, if the distance between the second and third units becomes smaller than the lower limit value, the zoom lens approaches the negative / positive two-unit zoom type, the back focus becomes longer, and the overall length of the lens tends to increase. . When the distance between the second and third lens groups becomes larger than the upper limit, the back focus becomes shorter, and the 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 groups at the wide-angle end with respect to the focal length of the whole system at the wide-angle end. Outer diameter increases. If the upper limit is exceeded, the overall 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, in the present invention, it is preferable to set the lens configuration as follows. The first lens group includes 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 from the object side, and the second lens group has a convex surface facing the object side. At least two aimed
One lens surface and at least one lens surface with a convex surface facing the image side, the lens closest to the object side in the second lens group is a positive lens, and the third lens group is a lens with a concave surface facing the object side. It has one lens surface.
【００１８】次に条件式（７）、（８）、（９）の技術
的な説明を行う。Next, technical expressions (7), (8) and (9) will be described.
【００１９】条件式（７）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 (7) relates to the refractive power ratio between the first lens group and the third lens group. If the lower limit of the conditional expression (7) is exceeded, the refractive power of the third lens group becomes strong, and the lens back becomes short. The lens diameter of the three lens groups increases, which is not preferable. On the other hand, when the value exceeds the upper limit, the overall length of the lens tends to increase.
【００２０】条件式（８）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 (8) relates to the ratio of the change in the block interval of each lens unit. When the ratio exceeds the upper limit, the change in the interval between the second and third lens units is small, and the change in the interval between the first and second lens units is large. It tends to be larger. More preferably, the upper limit is set to 6.0. If the lower limit is exceeded, it is advantageous for miniaturization, but the amount of movement of the third lens group becomes large and it becomes difficult to correct aberration fluctuations during zooming.
【００２１】条件式（９）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 (9) represents the ratio of the change in the combined focal length of the first and second lens groups to the change in the focal length of the entire lens system. If the lower limit of the conditional expression (9) is exceeded, the zooming effect of the second lens unit becomes weak. In addition, since the third lens unit is zoomed, the refracting power is increased, the moving amount is increased, and it becomes difficult to correct aberration fluctuation due to zooming. If the value exceeds the upper limit, the zooming action of the second lens unit becomes strong, and the overall length of the lens becomes undesirably large.
【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 conventionally performed by a first group, but various rear focus methods known in JP-A-64-74521 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 described. In the numerical examples, Ri is the radius of curvature of the i-th lens surface in order from the object side, Di is the i-th lens thickness and air spacing from the object side, and Ni and νi are the i-th lens surfaces in order from the object side. The refractive index and Abbe number of glass.
【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、前述の如く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 the lens configuration of the three lens groups as described above ,
The whole lens system can achieve a compact and high-performance zoom lens.
【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 sectional view of a lens according to a third numerical example of 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 sectional view of a lens according to a numerical example 4 of 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 relating 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 relating 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 a 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 relating to the present invention.
【図９】数値実施例１の諸収差図。FIG. 9 is a diagram illustrating various aberrations of Numerical Example 1.
【図１０】数値実施例２の諸収差図。FIG. 10 is a diagram illustrating various aberrations of Numerical Example 2.
【図１１】数値実施例３の諸収差図。FIG. 11 is a diagram illustrating various aberrations of Numerical Example 3.
【図１２】数値実施例４の諸収差図。FIG. 12 is a diagram illustrating various aberrations of Numerical Example 4.
【図１３】数値実施例５の諸収差図。FIG. 13 is a diagram showing various aberrations of Numerical Example 5.
【図１４】数値実施例６の諸収差図。FIG. 14 is a diagram showing various aberrations of Numerical Example 6.
【図１５】数値実施例７の諸収差図。FIG. 15 is a diagram illustrating various aberrations of Numerical Example 7.
【図１６】数値実施例８の諸収差図。FIG. 16 is a diagram showing various aberrations 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 plane ΔM Meridional image plane d d line g g line
フロントページの続き (56)参考文献 特開 昭54−78148（ＪＰ，Ａ) 特開 昭58−75108（ＪＰ，Ａ) 特開 昭63−271214（ＪＰ，Ａ) 特開 昭64−72114（ＪＰ，Ａ) 特開 平１−116615（ＪＰ，Ａ) 特開 平１−284819（ＪＰ，Ａ) 特開 平２−35406（ＪＰ，Ａ) 特開 平２−63007（ＪＰ，Ａ) 特開 平２−81020（ＪＰ，Ａ) 特開 平２−158708（ＪＰ，Ａ) 特開 平２−181715（ＪＰ，Ａ) 特開 平２−201409（ＪＰ，Ａ) 特開 平２−201410（ＪＰ，Ａ) 特開 平２−238416（ＪＰ，Ａ) 特開 平２−238417（ＪＰ，Ａ) 特開 平２−238418（ＪＰ，Ａ) 特開 平３−59633（ＪＰ，Ａ) 特開 平３−59634（ＪＰ，Ａ) 特開 平３−158816（ＪＰ，Ａ) 特開 平３−168609（ＪＰ，Ａ) 特開 平３−185413（ＪＰ，Ａ) 特開 平３−197914（ＪＰ，Ａ) 特開 平３−212607（ＪＰ，Ａ) 特開 平３−212608（ＪＰ，Ａ) 特開 平３−233422（ＪＰ，Ａ) 特開 平３−260611（ＪＰ，Ａ) 特開 平３−265811（ＪＰ，Ａ) 特開 平４−406（ＪＰ，Ａ) 特開 平４−70706（ＪＰ，Ａ) 特開 平４−93811（ＪＰ，Ａ) 特開 平４−93812（ＪＰ，Ａ) 特開 平４−97112（ＪＰ，Ａ) 特開 平４−153613（ＪＰ，Ａ) 特開 平４−218013（ＪＰ，Ａ) 特開 平５−93866（ＪＰ，Ａ) 特開 平５−173072（ＪＰ，Ａ) 特開 平５−173074（ＪＰ，Ａ) 特開 平５−181063（ＪＰ，Ａ) 特開 平６−82697（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04 Continuation of front page (56) References JP-A-54-78148 (JP, A) JP-A-58-75108 (JP, A) JP-A-63-271214 (JP, A) JP-A-64-72114 (JP) JP-A-1-116615 (JP, A) JP-A-1-284819 (JP, A) JP-A-2-35406 (JP, A) JP-A-2-63007 (JP, A) JP-A-2-81020 (JP, A) JP-A-2-158708 (JP, A) JP-A-2-181715 (JP, A) JP-A-2-201409 (JP, A) JP-A-2-201410 (JP, A A) JP-A-2-238416 (JP, A) JP-A-2-238417 (JP, A) JP-A-2-238418 (JP, A) JP-A-3-59633 (JP, A) JP-A-3 JP-A-59634 (JP, A) JP-A-3-158816 (JP, A) JP-A-3-168609 (JP, A) JP-A-3-185413 (JP, A) JP-A-3-197914 (JP, A) JP-A-3-212607 (JP, A) JP-A-3-212608 (JP, A) JP-A-3-233422 (J P, A) JP-A-3-260611 (JP, A) JP-A-3-265811 (JP, A) JP-A-4-406 (JP, A) JP-A-4-70706 (JP, A) JP-A-4-93811 (JP, A) JP-A-4-93812 (JP, A) JP-A-4-97112 (JP, A) JP-A-4-153613 (JP, A) JP-A-4-218013 (JP) JP-A-5-93866 (JP, A) JP-A-5-173072 (JP, A) JP-A-5-173074 (JP, A) JP-A-5-181063 (JP, A) 6-82697 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04
Claims (1)
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、前記第２レンズ群と第３
レンズ群を互いの間隔を変えながら共に物体側に移動さ
せるズームレンズであって、前記第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、前記第２レンズ群は、物体側より順に、両凸正
レンズ、正レンズ、両凹負レンズ、凸レンズの４枚の単
レンズより成り、前記第３レンズ群は物体側に凹面を向
けた少なくとも１枚の負レンズを有すると共に、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】 ｆ W ：広角端でのレンズ全系の合成焦点距離 ｆ T ：望遠端でのレンズ全系の合成焦点距離 ｆ i ：第ｉ群の焦点距離 ｌ 1W ：広角端での第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 ｌ 2W ：広角端での第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 ｆ 12W ：広角端での第１レンズ群と第２レンズ群の合成
焦点距離 ｆ 12T ：望遠端での第１レンズ群と第２レンズ群の合成
焦点距離 ｅ 1W ：広角端での第１レンズ群と第２レンズ群の主点間
隔 ｅ 1T ：望遠端での第１レンズ群と第２レンズ群の主点間
隔 ｅ 2W ：広角端での第２レンズ群と第３レンズ群の主点間
隔 ｅ 2T ：望遠端での第２レンズ群と第３レンズ群の主点間
隔 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 zooming from the wide-angle end to the telephoto end, the second lens group and the third
The lens group A zoom lens that was <br/> is moved in both the object side while changing the distance therebetween, said first lens group, the object
At least one negative lens with the concave surface facing the image side
Lens and at least one positive lens with the convex surface facing the object side
And the second lens group is biconvex positive in order from the object side.
Lens, positive lens, biconcave negative lens, convex lens
The third lens group has a concave surface facing the object side.
A compact zoom lens having at least one negative lens and each lens group configured to satisfy the following conditional expression. [Outside 1] f W : combined focal length of the entire lens system at the wide-angle end f T : combined focal length of the entire lens system at the telephoto end f i : focal length of the i- th lens unit l 1W : first and second lens units at the wide-angle end On the axis of the two lens groups
Lens surface spacing l 2W at the wide-angle end: on the axis of the second lens unit and the third lens unit
Definitive lens spacing f 12W: the first and second lens groups at the wide-angle end synthesis
Focal length f 12T : composition of first and second lens groups at the telephoto end
Focal length e 1W : between principal points of the first lens unit and the second lens unit at the wide-angle end
Distance e 1T : between principal points of the first and second lens groups at the telephoto end
Separation e 2W : between principal points of the second and third lens groups at the wide-angle end
Distance e 2T : between principal points of the second and third lens groups at the telephoto end
Separation
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 JPH06160715A (en) | 1994-06-07 |
| JP2974522B2 true 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) |
Families Citing this family (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 |
Family Cites Families (39)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5850326B2 (en) * | 1977-12-02 | 1983-11-10 | 旭光学工業株式会社 | Zoom lens with small distortion |
| JPS5875108A (en) * | 1981-10-28 | 1983-05-06 | Canon Inc | High variable magnification wide-angle zoom lens |
| JPH0814654B2 (en) * | 1987-04-28 | 1996-02-14 | キヤノン株式会社 | Small zoom lens |
| JPS6472114A (en) * | 1987-09-11 | 1989-03-17 | Canon Kk | Zoom lens |
| JP2621387B2 (en) * | 1988-07-26 | 1997-06-18 | キヤノン株式会社 | Variable power optical system with anti-vibration function |
| JPH01116615A (en) * | 1987-10-30 | 1989-05-09 | Canon Inc | Variable power range variable zoom lens |
| JP2782720B2 (en) * | 1988-05-12 | 1998-08-06 | ミノルタ株式会社 | Zoom lens |
| JP2702520B2 (en) * | 1988-08-30 | 1998-01-21 | 株式会社リコー | Small zoom lens |
| JP2581193B2 (en) * | 1988-09-19 | 1997-02-12 | キヤノン株式会社 | Variable power optical system with anti-vibration function |
| JPH02158708A (en) * | 1988-12-13 | 1990-06-19 | Canon Inc | Wide angle zoom lens |
| JP2621454B2 (en) * | 1989-01-06 | 1997-06-18 | キヤノン株式会社 | Zoom lens |
| JP2629935B2 (en) * | 1989-01-31 | 1997-07-16 | キヤノン株式会社 | Rear focus zoom lens |
| JPH02238417A (en) * | 1989-03-10 | 1990-09-20 | Canon Inc | Zoom lens |
| JP2581206B2 (en) * | 1989-03-10 | 1997-02-12 | キヤノン株式会社 | Zoom lens |
| JP2581204B2 (en) * | 1989-01-31 | 1997-02-12 | キヤノン株式会社 | 3-group zoom lens |
| JPH02238418A (en) * | 1989-03-10 | 1990-09-20 | Canon Inc | Zoom lens |
| JP2908489B2 (en) * | 1989-01-23 | 1999-06-21 | 株式会社リコー | Zoom lens and focusing method |
| JPH0359633A (en) * | 1989-07-28 | 1991-03-14 | Canon Inc | Camera system |
| JPH0359634A (en) * | 1989-07-28 | 1991-03-14 | Canon Inc | Camera system |
| 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 |
| JP2780394B2 (en) * | 1989-11-17 | 1998-07-30 | キヤノン株式会社 | Zoom lens with simple configuration |
| JPH0493812A (en) * | 1990-08-03 | 1992-03-26 | Canon Inc | Variable power lens |
| JP2775964B2 (en) * | 1990-03-09 | 1998-07-16 | キヤノン株式会社 | Zoom lens with simple configuration |
| JPH03233422A (en) * | 1989-12-22 | 1991-10-17 | Ricoh Co Ltd | Small-sized zoom lens |
| JPH04406A (en) * | 1990-04-18 | 1992-01-06 | Konica Corp | Zoom lens capable of short-distance photographing |
| JPH03212608A (en) * | 1990-01-18 | 1991-09-18 | Konica Corp | Zoom lens |
| JPH03212607A (en) * | 1990-01-18 | 1991-09-18 | Konica Corp | Zoom lens |
| JPH03265811A (en) * | 1990-03-15 | 1991-11-26 | Canon Inc | Zoom lens |
| 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 |
| JPH0497112A (en) * | 1990-08-09 | 1992-03-30 | Olympus Optical Co Ltd | Wide-angle zoom lens |
| JP2811950B2 (en) * | 1990-10-17 | 1998-10-15 | キヤノン株式会社 | Zoom lens having simple configuration and camera having the same |
| JP3120386B2 (en) * | 1991-04-12 | 2000-12-25 | コニカ株式会社 | 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 |
| JP3093850B2 (en) * | 1992-01-06 | 2000-10-03 | オリンパス光学工業株式会社 | 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
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06160715A (en) | 1994-06-07 |
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