JPS58111013A - Small-sized wide angle zoom lens - Google Patents
Small-sized wide angle zoom lensInfo
- Publication number
- JPS58111013A JPS58111013A JP56215482A JP21548281A JPS58111013A JP S58111013 A JPS58111013 A JP S58111013A JP 56215482 A JP56215482 A JP 56215482A JP 21548281 A JP21548281 A JP 21548281A JP S58111013 A JPS58111013 A JP S58111013A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- zoom
- group
- lens group
- zoom lens
- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
-
- 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)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はズームレンズに関し物体側より順に発散性の第
ルンズ群、収斂性の第２レンズ群そして発散性の第３レ
ンズ群の３つのレン、ズ群で構成し、第ルンズ群と第２
レンズ群を光軸上移動させてズーミングを行った小型化
を図った広角ズームレンズに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zoom lens, which is composed of three lens groups: a diverging lens group, a convergent second lens group, and a diverging third lens group, in order from the object side. Luns Group and 2nd
The present invention relates to a compact wide-angle zoom lens that performs zooming by moving a lens group on the optical axis.
従来から小型化を図ったズームレンズとして、発散性の
第ルンズ群と収斂性の第２レンズ群２つのレンズ群で構
成し、両レンズ群の間隔を変えてズーミングを行ういわ
ゆる２群方式のズ散性の物体側の第ルンズ群を３枚のし
／ズ構成とし、ある程度パワーを強め、望遠端の％−人
位置における両レンズ群間の主点間隔をある程度小さく
することｋよりズームレンズの前玉径およびレンズ全長
（第１レンズ面から像面まで）特に広角端のズーム位置
でのレンズ全ａｔコンバク）Ｋしている。一方後者はズ
ーミングにおいて物体側の第１レンズ群を光軸上直線的
に移動させ望遠端のズーム位置でのレンズ全長のコンパ
クト化を図っており、発散性の物体側の＠ルンズ群のパ
ワーは前者のズームレンズに比べ弱くなっている。ズー
ムレンズ系のコンパクト化を図る場合、前者では発散性
の物体側の第ルンズ群のパワーをさらに強くすれば広角
端のズーム位置でのレンズ全長はさらに短かくなるが、
逆に望遠端のズーム位置で０レンズ全長は兼〈なり、つ
いには広角端のズーム位置でのレンズ全長よりも長くな
ってし重う。一方後者では望遠端のズーム位置でのレン
ズ全長の短縮化には好ましいが広角端のズーム位置での
レンズ全長が憂くなる傾向があり更にズームレンズの前
玉径が大きくなり好ましくない。一般には２群方式のズ
ームレンズにおりてズームレンズのレンズ全長を最も効
率曳く短くするＫは広角端と望遠端の両方のズーム位置
でのレンズ全長が等しくなるようにするのがよい。A zoom lens that has traditionally been designed to be more compact is a so-called two-group zoom lens that consists of two lens groups: a diverging lens group and a convergent second lens group, and performs zooming by changing the distance between both lens groups. The dispersive object-side lens group has a three-lens configuration, increases the power to some extent, and reduces the principal point distance between both lens groups at the telephoto end to a certain extent. The diameter of the front lens and the total length of the lens (from the first lens surface to the image surface, especially at the wide-angle end zoom position) are K. On the other hand, the latter moves the first lens group on the object side linearly on the optical axis during zooming to make the overall length of the lens compact at the telephoto end zoom position, and the power of the diverging object side @Luns group is It is weaker than the former zoom lens. When trying to make a zoom lens system more compact, if the power of the diverging object-side lens group is made even stronger, the overall length of the lens at the wide-angle end zoom position will become even shorter.
On the other hand, at the telephoto end zoom position, the total length of the 0 lens becomes shorter, and eventually becomes longer and heavier than the lens total length at the wide-angle end zoom position. On the other hand, the latter option is preferable for shortening the overall lens length at the telephoto end zoom position, but tends to reduce the overall lens length at the wide-angle end zoom position, and is also undesirable because it increases the diameter of the front lens of the zoom lens. In general, in a two-group zoom lens, K, which shortens the total lens length of the zoom lens most efficiently, should be set so that the total lens length at both the wide-angle end and the telephoto end is equal.
本発明は２群方式のズームレンズの特徴を採用し、レン
ズ全長の短縮化を図る為、新たなレンズ構成を採用しつ
つ光学性能の極めて良い広角ズームレンズの提供を目的
とするものである。An object of the present invention is to provide a wide-angle zoom lens that employs the characteristics of a two-group zoom lens, adopts a new lens configuration in order to shorten the overall length of the lens, and has extremely good optical performance.
本発明の目的を達成する為のズームレンズのレンズ構成
の特徴は物体側より＠に１発散性の第ルンズ群、収斂性
の第２レンズ群そして発散性の第３レンズ群の３つのレ
ンズ群で構成し、前記第１レンズ群と第２レンズ群を光
軸上移動させてズーミングを行なうものである。The lens structure of the zoom lens for achieving the purpose of the present invention is characterized by three lens groups from the object side: the first diverging lens group, the convergent second lens group, and the diverging third lens group. The first lens group and the second lens group are moved on the optical axis to perform zooming.
本発明のズームレンズの構成を前記従来例の２群方式の
ズームレンズと比較してみると収斂性の倫側の第２レン
ズ群を収斂性のレンズ群と発散性のレンズ群の２つのレ
ンズ群に分け、分割した収斂性のレンズ群のみを発散性
の第１レンズ群と共に光軸上移動させズーミングを行な
うのと同じ構成に＆る。本発明のズームレンズの構成を
このように考えることもできるが、本発明のズームレン
ズの構成はズームレンズの小製化を図りつつ光学性能の
向上を図る為に案出された新しいタイプのズームし／ズ
なのである。Comparing the configuration of the zoom lens of the present invention with the conventional two-group zoom lens, it is found that the second lens group on the convergent side is composed of two lenses: a convergent lens group and a diverging lens group. The configuration is the same as that in which zooming is performed by dividing the lens into groups and moving only the divided convergent lens group along with the first diverging lens group along the optical axis. Although the configuration of the zoom lens of the present invention can be considered in this way, the configuration of the zoom lens of the present invention is a new type of zoom that was devised to improve optical performance while reducing the size of the zoom lens. It is shi/zu.
すなわち、従来より１１１１図に示すように発散性のＩ
ＩＩレンズ群、収斂性の第２レンズ群そして発散性の第
３レンズ群０３つのレンズ群よ抄なり、第２レンズ群と
＄１３レンズ群を物体側方向へ移動させ、第１レンズ詳
を非直線的に移動させてズーミングを行うズームレンズ
が知られている。このようなズーム方式においてズーム
比をある程度保りには第２レンズ群の移動量をふやすと
同時に第ルンズ群と第３レンズ群を同図の点線の矢印の
如く移動させる必要がある。In other words, as shown in Fig. 1111, the divergent I
There are three lens groups: II lens group, convergent second lens group, and divergent third lens group.The second lens group and $13 lens group are moved toward the object side, and the details of the first lens are hidden. A zoom lens that performs zooming by moving in a straight line is known. In such a zoom system, in order to maintain a certain zoom ratio, it is necessary to increase the amount of movement of the second lens group and at the same time move the lens group and the third lens group as indicated by dotted line arrows in the figure.
この場合第ルンズ群の位置は広角端より望遠端の方が物
体側前方へ出る傾向になり、望遠端でのレンズ全長が長
く１に９大型化してしまう。In this case, the position of the lens group tends to be farther forward on the object side at the telephoto end than at the wide-angle end, and the overall length of the lens at the telephoto end is longer, resulting in an increase in size of 1:9.
次に第３レンズ群のズーム移動量を減らしていくと第ル
ンズ群は像側方向への移動量がふえてくるため、第２レ
ンズ群の少ないズーム移動量で、ある程度のズーム比を
保つことが出来る。Next, as the amount of zoom movement of the third lens group is reduced, the amount of movement of the third lens group toward the image side increases, so it is necessary to maintain a certain zoom ratio with a small amount of zoom movement of the second lens group. I can do it.
本発明のズームレンズはこのようなズームレンズの性質
を利用し、ズームレンズの小型化を図りつつ鳥性能な光
学性能を得る目的で、創作されたものであり、第３レン
ズ群をズーミング中固定とし、このときのズームレンズ
の性質といわゆる２群方式のズームレンズの特徴を採り
つつ極めて小型でしかも良好に収差補正を達成した広角
ズームレンズなのである。The zoom lens of the present invention was created with the aim of downsizing the zoom lens and achieving bird-like optical performance by utilizing the properties of the zoom lens, and the third lens group is fixed during zooming. This is a wide-angle zoom lens that is extremely compact and achieves excellent aberration correction while adopting the characteristics of zoom lenses and the characteristics of so-called two-group zoom lenses.
次に本発明に係るズームレンズ構成を従来よりズームレ
ンズの小型化を図るには有利とされているいわゆる２群
方式のズームレンズを例にとりこの２群方式のズームレ
ンズと比較しつつ本発明に係るズームレンズが更に小型
化に遣している事を各図を用いて説明する。Next, we will compare the zoom lens structure according to the present invention with a so-called two-group zoom lens, which has been conventionally considered to be advantageous in reducing the size of zoom lenses, and compare it with this two-group zoom lens. The fact that such a zoom lens is further miniaturized will be explained with reference to the figures.
第２図（ａ）、 （ｂ）は従来の２群方式のズームレン
ズと本発明に係るズームレンズの説明図であ抄ＩＦｉ正
の第ルンズ群、■は負の第２レンズ群、Ｐはフィルム面
である。同図Φ）Ｋ示すように収敵性の侭側の第２レン
ズ群■を正と負のレンズ群ＩＩと１１に分割し本発明に
係るズームレンズと同様のレンズ構成として考えると、
この分割し九しンズ群自体はテレフォトタイプのレンズ
構成になるためにフィルム面ｒ壕での距離は短くなりＦ
の位置にくるのでパックフォーカスは短くなる。これに
よって広角端と望遠端の両方のズーム位置でと４にレン
ズ全長を短縮することが可能となる。嬉３閤（組（ロ）
、第４図（−９（ロ）はズー建ングによるレンズ群の移
動量の説明である。第３図（ｂ）に示すように分割し九
収斂性レンズ群のパワーは分割し九他方のレンズ群が員
である為に分割する曽のレンズ群Ｏノ（ワーよ勢当然強
くなっている丸め、第３１１（荀に比べて少ない移動量
で同じズーム比を達成することが出来る。FIGS. 2(a) and 2(b) are explanatory diagrams of a conventional two-group zoom lens and a zoom lens according to the present invention. This is the film side. As shown in Φ)K in the figure, if the second lens group ■ on the side of convergence is divided into positive and negative lens groups II and 11, and considered as a lens configuration similar to the zoom lens according to the present invention,
This divided nine-lens group itself has a telephoto type lens configuration, so the distance at the film surface r trench is shortened and F
Since it comes to the position of , the puck focus becomes short. This makes it possible to shorten the total lens length by 4 times at both the wide-angle end and the telephoto end. Happy 3 kan (Group (Ro))
, Fig. 4(-9(b)) is an explanation of the amount of movement of the lens group due to the zoom lens.The power of the nine convergent lens groups is divided as shown in Fig. 3(b), and the power of the other convergent lens group is divided as shown in Fig. 3(b). Since the lens group is divided into two groups, the same zoom ratio can be achieved with a smaller amount of movement compared to the 311th lens group.
これによって広角端のズーム位置での発散性レンズ群と
分割した収斂性のレンズ群の主点間隔をΔＤ、だけ小さ
くすることが出来、この結果レンズ全長の短縮化を図る
ことができる。As a result, the distance between the principal points of the diverging lens group and the divided convergent lens group at the zoom position at the wide-angle end can be reduced by ΔD, and as a result, the overall length of the lens can be shortened.
又本発明に係るズームレンズでは、仮参に発散性第ルン
ズ群のパワーが従来の２群方式のズームレンズにおける
発散性の第ルンズ群のパワーと同一であってもｌＩ２レ
ンズ群のパワーが強くなるのでレンズ全長の短縮化が有
利となる。そして従来の２群方式のズームレンズにおい
て第ルンズ群のパワーを強くして広角端のズーム位置で
のレンズ全長を望遠端のズーム位置でのレンズ全長と同
じにしてズームレンズの小型化を効率良く行った場合よ
りもさらに本発明のズームレンズはレンズ全長の短縮化
を更に図ることが可能となる。Furthermore, in the zoom lens according to the present invention, even if the power of the diverging lens group is the same as the power of the diverging lens group in a conventional two-group zoom lens, the power of the lI2 lens group is stronger. Therefore, it is advantageous to shorten the total lens length. In conventional two-group zoom lenses, the power of the second lens group is increased to make the total lens length at the wide-angle end the same as the lens length at the telephoto end, making it possible to efficiently downsize the zoom lens. In the zoom lens of the present invention, the overall length of the lens can be further shortened than in the case where this is done.
前述の如く、本発明に係るズームレンズで社従来の２群
方式のズームレンズに比べて収斂性第２レンズ群の移動
量を少なくてもズーム比を達成することが出来るため、
広角端のズーム位置を基準とした時、望遠端のズーム位
置での発散性ｗＥｌレンズ群Ｉの位置は第４図（ａ）に
示す従来例に対し第４図（ｂ）に示すようにΔＤ、だけ
より儂側にくる。従って望遠端でのレンズ全長が広角端
のレンズ全長より短かくなるため広角端Ｏレンズ全長の
短縮の余裕が生まれ発散性第ルンズ群のパワーをさらに
強くしてレンズ全長の短縮がはかれる。以上本発明に係
るズームレンズの基本的特徴について簡単の丸め従来の
２群方式のズームレンズと比較して説明し丸。As mentioned above, the zoom lens according to the present invention can achieve a zoom ratio even with a smaller amount of movement of the convergent second lens group than the conventional two-group zoom lens.
When the zoom position at the wide-angle end is taken as a reference, the position of the diverging wEl lens group I at the zoom position at the telephoto end is ΔD as shown in FIG. 4(b) with respect to the conventional example shown in FIG. 4(a). , just come to my side. Therefore, since the total lens length at the telephoto end is shorter than the total lens length at the wide-angle end, there is a margin for shortening the total lens length at the wide-angle end, and the power of the diverging lens group is further strengthened to shorten the total lens length. The basic features of the zoom lens according to the present invention will be explained in simple circles in comparison with a conventional two-group zoom lens.
一方、本発ＱＩＩＫ係るズームレンズを３つのレンズ群
から構成し、５＄ルンズ群と第２レンズ群を移動させて
ズー々ングを行い第３レンズを固定したものとして考え
てもよいことは前述の第１図の説明で述べたようにさし
つかえないことはいうまでもない。On the other hand, as mentioned above, the zoom lens according to the QIIK of the present invention can be considered to be composed of three lens groups, with the lens group and the second lens group moving to perform zooming, and the third lens being fixed. It goes without saying that this is not a problem as stated in the explanation of Figure 1.
本発明に係るズームレンズは以上のレンズ構成で小型化
と良好なる収差補正を達成することができるものである
が、質に東好なる光学性能を得る為には次の条件を満足
するのが好ましい。The zoom lens according to the present invention can achieve miniaturization and good aberration correction with the lens configuration described above, but in order to obtain optical performance of high quality, it is necessary to satisfy the following conditions. preferable.
まず、１１３レンズ群の焦点距離を１厘とし九時ｌ ｆ
厘１を望遠端のズーム位置での焦点距−ｆ７より大きく
すなわちＩ ｆｇ ｌ≧ｆ丁とすることである。First, let's assume that the focal length of the 113 lens group is 1 rin, and at 9 o'clock l f
The objective is to make the focal length 1 larger than the focal length -f7 at the telephoto end zoom position, that is, I fg l≧f.
これは第２レンズ群のパワーを制約し、この第２レンズ
群から発生する収差量が極端に大きくならない様にする
丸めの条件であり更に広角端でのパックフォーカスを必
要量保つための条件でもある。この範囲以外になると第
２レンズ群から発生する収差量が極端に増加しズームレ
ンズ全体としての収差を良好に補正することができなく
なり、また、パックフォーカスが短かく眼レフカメラに
装着した時ミラーアップが困−になってしまう。次に第
ルンズ群の焦点距−をｆｌとし走時１ｆｘｌはｆ７よ抄
小さくすなわちｌｆ＋ｌ＜ｆｔとすることである。これ
はレンズ全長ｏ短ｍ化およびズームレンズの前玉径の縮
小をはかる丸めの条件である。この条件より外れると広
角端のズーム位置でのレンズ全長、およびズームレンズ
の前玉径が大きくなり過ぎコンパクト化が困難となる。This is a rounding condition that limits the power of the second lens group and prevents the amount of aberration generated from this second lens group from becoming extremely large.It is also a condition for maintaining the necessary amount of pack focus at the wide-angle end. be. Outside this range, the amount of aberrations generated from the second lens group will increase dramatically, making it impossible to properly correct the aberrations of the zoom lens as a whole.Also, since the pack focus is short, when attached to an eye reflex camera, It becomes difficult to upload. Next, the focal length - of the lens group is set to fl, and the travel time 1fxl is set to be smaller than f7, that is, lf+l<ft. This is a rounding condition for shortening the overall lens length (o) and reducing the diameter of the front lens of the zoom lens. If this condition is not met, the overall length of the lens at the wide-angle end zoom position and the diameter of the front lens of the zoom lens become too large, making it difficult to make it compact.
さらに後述する零発−の実施例の如くズーム比が２倍以
下で開放、ＦナンバーがＦ７４程度のときは発散性ｌＸ
３レンズ群を単レンズで構成するのが好ましい。これは
ズームレンズ全系の収差の悪化しない範囲内でズームレ
ンズ全系をコンパクトにするのに好ましい。また８２レ
ンズ群内に開口絞りを持つ場合には第ルンズ群のパワー
がある程度強い九め広角端において樽瀧の歪−収差が多
く発生し鳥くなるため、この歪−収差を開口絞により倫
側にある第３レンズ群で良好に補正することが可能とな
る。このとＩＯ補正を効果的に行うには＃Ｉ３レンズ群
の負レンズを像面側に凹面を向叶友メニスカスの形状に
するのが良−０更に本発１１１におけるズームレンズの
光学性能を良好に保ちながらズームレンズ系金体をコン
パクトにする九めには以下に示す諸条件を満たすのが好
ましい。Furthermore, as in the zero-shot embodiment described later, when the zoom ratio is 2x or less and the F number is about F74, the divergence lX
It is preferable that the three lens groups are composed of a single lens. This is preferable for making the entire zoom lens system compact within a range where the aberrations of the entire zoom lens system are not worsened. In addition, when an aperture diaphragm is included in the 82nd lens group, a large amount of Tarutaki distortion and aberration occurs at the 9th wide-angle end, where the power of the 82nd lens group is strong to some extent. It becomes possible to perform good correction using the third lens group located on the side. In order to effectively perform the IO correction, it is better to make the negative lens of the #I3 lens group have a concave surface facing toward the image plane in the shape of a meniscus. Ninth, in order to make the zoom lens system metal body compact while maintaining the following conditions, it is preferable to satisfy the following conditions.
そして第ルンズ群には少なくとも最４会儒に正レンズを
配し鋏正レンズと物体側前方のレンズと作る空気レンズ
に収斂作用を持えせ、第２レンズ群を物体側より順に２
枚以上の正レンズ群と負レンズ群そして正レンズ群で構
成するのが好ましい。Then, in the lens group, at least the fourth positive lens is arranged, and the air lens formed by the scissor positive lens and the front lens on the object side has a converging effect, and the second lens group is arranged in order from the object side.
It is preferable that the lens be composed of a positive lens group, a negative lens group, and a positive lens group.
条件式（１）の下限値以下では広角端より望遠端の方が
レンズ全長が長くなる傾向とがり、さらズ全長の短縮化
が不足し好ましくない。Below the lower limit of conditional expression (1), the overall lens length tends to be longer at the telephoto end than at the wide-angle end, which is not preferable because the overall lens length is not shortened enough.
条件式（２）の下限値以下では広角端でのバッタ攪゛
フォーカスを必要貴職ることがむりかしくなり、さらに
＃Ｅ３レンズ群を性能上、簡単なレンズで構成すること
が困難になる。上限値以上では仁の第３レンズ群のパワ
ーが弱くなり過ぎ、コンパクト化の効果がうすれて来る
。を友、第ルンズ群とｌｉ２レンズ群を上記のようなレ
ンズ構成とすることは各レンズ群内で球面収差の発生を
ある程度除去しズーミングによる球面収差の変動を良好
に補正するためである。Below the lower limit of conditional expression (2), it becomes difficult to achieve the necessary grasshopper focusing at the wide-angle end, and furthermore, it becomes difficult to configure the #E3 lens group with simple lenses in terms of performance. Above the upper limit, the power of Jin's third lens group becomes too weak, and the effect of compactness is diminished. The reason why the lens group and the li2 lens group are configured as described above is to eliminate the occurrence of spherical aberration to some extent within each lens group and to satisfactorily correct fluctuations in spherical aberration due to zooming.
次に第３レンズ群の収差論的作用効果にりいて説明する
。後述する本発明の実施例２にりいて開口絞りを第２レ
ンズ−の物体側より数えて第１番目と第２番目のレンズ
間に設は走時の第１、第２および第３レンズ群の８ｅ！
ｄば０３次収差係数を表ＩＫ示す。Next, the aberrational effects of the third lens group will be explained. In Embodiment 2 of the present invention, which will be described later, an aperture stop is provided between the first and second lenses counting from the object side of the second lens. 8e!
The third-order aberration coefficients are shown in Table IK.
／
／
／
Δ准龜 島″Ｋ１１ Δ酢−◆占
糠−味ｅ＠ 味−
表１に示す如く、第３レンズ群はズーミング中であって
も球面収差（８人）は一定であるが非点収差（Ａ８）と
歪曲収差（Ｄ８）はともに補正過制方向へ作用し非点収
差（Ａ８）はその作用が広角側で強く望遠側では少なく
がっている。本発明に係るズームレンズにおいては第ル
ンズ群と第２レンズ群のパワーをある程度強くしている
ので第１レンズ群と第２レンズ群の合わさったレンズ系
から轡に広角端において補正不足の非点収差が発生し易
くなるため、仁のときの収差補正の九め上ｌｅ第３レン
ズ群の作用が極めて効果的となる。また広角端において
樽蓋の歪曲も発生し１くなるのでこの補正に４ｈ有効で
ある。／ ／ ／ Δjunikushima "K11 Δvinegar - ◆Zannu - Ajie @ Aji - As shown in Table 1, the spherical aberration (8 people) of the third lens group is constant even during zooming, but it is non-uniform. Point aberration (A8) and distortion aberration (D8) both act in the direction of overcorrection and suppression, and astigmatism (A8) has a strong effect on the wide-angle side and decreases on the telephoto side.In the zoom lens according to the present invention Since the power of the lens group and the second lens group is strengthened to some extent, the combined lens system of the first and second lens groups tends to cause insufficiently corrected astigmatism at the wide-angle end. , the effect of the third lens group in correcting aberrations is extremely effective when the aberration is corrected.Furthermore, at the wide-angle end, distortion of the barrel lid also occurs and becomes 1, so 4 hours is effective for this correction.
このように本発明に係るズームレンズにおいては、第３
レンズ群は第ルンズ群および第２レンズ群から発生する
収差を打ち消す作用効果を持っている。この為従来のレ
ンズ全系で収差補正を行つ九２群方式の構成のズームレ
ンズにおいて、ズームレンズと像面の関にいわゆるリア
・アタッチメントレンズ（これのみで収差が除去されて
いる）を装着し全レンズ系の焦点距離を変化させる単な
る３つのレンズ群よりなるズームレンズと比べてみても
本発明のズームレンズは根本的に目的及び作用効果を異
にしており、単に負と正のレンズ群からなるズームレン
ズの後方に新たなレンズ群を付加し、焦点距離を変化さ
せ九ものと社格側の作用効果の違いがある。In this way, in the zoom lens according to the present invention, the third
The lens group has the effect of canceling aberrations generated from the first lens group and the second lens group. For this reason, in conventional zoom lenses with a 92-group structure that corrects aberrations in the entire lens system, a so-called rear attachment lens (which alone eliminates aberrations) is attached between the zoom lens and the image plane. However, even when compared with a zoom lens that simply consists of three lens groups that change the focal length of the entire lens system, the zoom lens of the present invention fundamentally differs in purpose and function; it simply consists of negative and positive lens groups. A new lens group is added to the rear of the zoom lens consisting of , and the focal length is changed, resulting in a difference in function and effect between the Kumono and the Shakaku side.
本発明では以上のよう危レンズ構成とする仁とにより、
後述する実施例に示す如く、−角。In the present invention, by using the lens configuration as described above,
As shown in the examples described later, - angle.
６２〜ａ５．ａ、Ｉｉ’ナンバー１．４〜４．５で広角
端のレンズ全長が望遠端の焦点距離の１．４脩一度とい
う極めてコンパクトでしか亀性能曳好なる広角ズームレ
ンズが実現可能となる。62-a5. With a, Ii' numbers of 1.4 to 4.5, it is possible to realize an extremely compact wide-angle zoom lens whose total lens length at the wide-angle end is 1.4 degrees longer than the focal length at the telephoto end, and which has good performance.
尚、フォーカシングは、レンズ全体を繰り出して行って
も良く、又ＩＩ３レンズを固定し、第ルンズと第２レン
ズを繰争出して行うことも又第ルンズ群あるいはｌ［２
レンズ群のみを繰り出して行ってもよい。Note that focusing may be performed by extending the entire lens, or may be performed by fixing the II3 lens and extending the second lens and second lens.
It is also possible to extend only the lens group.
次に本発明の数値実施例を示す。数値実施例においてＲ
１１ｊ物体側より願に第ｉｌｌ目のレンズ面の曲率半径
、Ｄ直は物体側より屓に第１番目のレンズ厚及び空気間
隔、Ｎ這とνＩは夫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ツベ数である。Next, numerical examples of the present invention will be shown. In numerical examples R
11j is the radius of curvature of the ill-th lens surface from the object side, D is the thickness and air gap of the 1st lens from the object side, and N and νI are the curvature radius of the i-th lens from the object side, respectively. These are the refractive index and Atsube number of glass.
自＾ 息＾ １＾ −＾ へ−噛 −−曽
＆＆ｋｋ＆＆＆＆ の口
１−ｃＤSelf ＾ breath ＾ 1 ＾ − ＾ He bite -- Zeng
&&kk&&&& mouth 1-cD
ｇｔ図は従来のズームレンズのズーム方式の説明図、１
１１２図（ａ）、 （ｂ）、第３図（ａ）、 （ｂ）、
第４図（ａ）、 （ｂ）は各々従来のズームレンズのレ
ンズ構成と本発明に係るズームレンズのレンズ構成の比
較の為の説明図、第５図と第６図は各々本発明の実施例
１と実施例２のレンズ断面図、ｉ［７図（ａ）、 （ｂ
）、 （ｅ）と第８図（ａ）、 （ｂ）、 （ｃ）＃ｉ
各々本発明の実施例１と実施例２の広角端、中間、望遠
端のズーム位置での諸収差図である。
図中、Ｍはメリデイオナルｆａ面、８Ｆｉサジタル像面
である。
特許出願人 キャノン株式会社
冶３霞
（α）（ｂ）
第４霞
（α） （ｂ）gt diagram is an explanatory diagram of the zoom method of a conventional zoom lens, 1
112 Figures (a), (b), Figure 3 (a), (b),
FIGS. 4(a) and 4(b) are explanatory diagrams for comparison between the lens configuration of a conventional zoom lens and the zoom lens according to the present invention, and FIGS. 5 and 6 are illustrations of the lens configuration of a zoom lens according to the present invention, respectively. Lens cross-sectional views of Example 1 and Example 2, i [Figure 7 (a), (b
), (e) and Figure 8 (a), (b), (c)#i
FIG. 4 is a diagram showing various aberrations at the wide-angle end, intermediate, and telephoto end zoom positions of Example 1 and Example 2 of the present invention, respectively. In the figure, M is the meridional fa plane and the 8Fi sagittal image plane. Patent applicant Canon Co., Ltd. Ji 3 Kasumi (α) (b) No. 4 Kasumi (α) (b)
Claims (1)
の＃Ｉ２レンズ群そして発散性のｌ／Ｅ３レンズ群の３
つのレンズ群で構成し、前記第１レンズ群と第２レンズ
群を光軸上移動させてズーミングを行なうことを特徴と
する小型の広角ズームレンズ。 （２）前記第３レンズ群の焦点距離を釉、望遠端のズー
ム位置における焦点距離をｆテとした時１ｆ厘１≧ｆテ
なる条件を満足することを特徴とする特許−求ｏａｔｓ
第１項記載の小型の広角ズームレンズ。 （３）曽紀第ルンズ群の焦点距離をｆｌとした時１ｆｌ
ｌ≦ｆｙなる条件を満足する仁とを特徴とする４１杵請
求の範囲第２°項記載の小型の広角ズームレンズ。 （４） 前記第３レンズ群を負の屈折力のレンズ１枚
で構成し前記負の屈折力のレンズを書面側に凹面を向け
たメニスカス形状としたことを特徴とする特許請求の範
囲第３項紀載の小型の広角ズームレンズ。[Scope of claims]
1. A compact wide-angle zoom lens comprising two lens groups, the first lens group and the second lens group being moved on the optical axis to perform zooming. (2) A patent characterized in that, when the focal length of the third lens group is glazed and the focal length at the telephoto end zoom position is f, the following condition is satisfied: 1 f 1 ≧ f
The small wide-angle zoom lens described in item 1. (3) When the focal length of the Zeng period Luns group is fl, it is 1 fl.
41. A small wide-angle zoom lens according to claim 2, characterized in that the lens satisfies the condition l≦fy. (4) Claim 3, characterized in that the third lens group is composed of one lens with negative refractive power, and the lens with negative refractive power has a meniscus shape with a concave surface facing the document side. A compact wide-angle zoom lens manufactured by Kishi.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56215482A JPS58111013A (en) | 1981-12-24 | 1981-12-24 | Small-sized wide angle zoom lens |
| US06/733,856 US4647160A (en) | 1981-12-24 | 1985-05-13 | Small-sized wide angle zoom objective |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56215482A JPS58111013A (en) | 1981-12-24 | 1981-12-24 | Small-sized wide angle zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58111013A true JPS58111013A (en) | 1983-07-01 |
| JPS6161653B2 JPS6161653B2 (en) | 1986-12-26 |
Family
ID=16673107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56215482A Granted JPS58111013A (en) | 1981-12-24 | 1981-12-24 | Small-sized wide angle zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58111013A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61167919A (en) * | 1985-01-21 | 1986-07-29 | Canon Inc | Variable power finder |
| DE3610472A1 (en) * | 1985-03-27 | 1986-10-09 | Ricoh Co., Ltd., Tokio/Tokyo | SMALL ZOOM LENS |
| JPS61240217A (en) * | 1985-04-17 | 1986-10-25 | Asahi Optical Co Ltd | Compact wide angle zoom lens |
| US4730907A (en) * | 1983-12-05 | 1988-03-15 | Olympus Optical Co., Ltd. | Compact zoom lens system |
| JPS63210907A (en) * | 1987-02-27 | 1988-09-01 | Asahi Optical Co Ltd | Compact and bright wide-angle zoom lens |
| JPH01284819A (en) * | 1988-05-12 | 1989-11-16 | Minolta Camera Co Ltd | Zoom lens |
| JP2002236254A (en) * | 2001-02-09 | 2002-08-23 | Sigma Corp | Zoom lens |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5226236A (en) * | 1975-08-22 | 1977-02-26 | Canon Inc | Zoom lens system |
| JPS52109930A (en) * | 1976-03-11 | 1977-09-14 | Nippon Chemical Ind | Rear conversion lens |
| JPS53132360A (en) * | 1977-04-25 | 1978-11-18 | Canon Inc | Wide angle zoom lens of small size |
| JPS5478149A (en) * | 1977-12-02 | 1979-06-22 | Asahi Optical Co Ltd | Zoom lens of small distortion aberration for wide angle |
| JPS5478148A (en) * | 1977-12-02 | 1979-06-22 | Asahi Optical Co Ltd | Zoom lens of small distortion aberration |
| JPS559550A (en) * | 1978-07-06 | 1980-01-23 | Canon Inc | Zoom lens system |
| JPS56107210A (en) * | 1980-01-31 | 1981-08-26 | Nippon Kogaku Kk <Nikon> | Lens system permitting short-distance photographing |
| JPS575023A (en) * | 1980-06-11 | 1982-01-11 | Minolta Camera Co Ltd | Zoom lens system |
| JPS5897016A (en) * | 1981-12-07 | 1983-06-09 | Mamiya Koki Kk | Wide angle zoom lens |
-
1981
- 1981-12-24 JP JP56215482A patent/JPS58111013A/en active Granted
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5226236A (en) * | 1975-08-22 | 1977-02-26 | Canon Inc | Zoom lens system |
| JPS52109930A (en) * | 1976-03-11 | 1977-09-14 | Nippon Chemical Ind | Rear conversion lens |
| JPS53132360A (en) * | 1977-04-25 | 1978-11-18 | Canon Inc | Wide angle zoom lens of small size |
| JPS5478149A (en) * | 1977-12-02 | 1979-06-22 | Asahi Optical Co Ltd | Zoom lens of small distortion aberration for wide angle |
| JPS5478148A (en) * | 1977-12-02 | 1979-06-22 | Asahi Optical Co Ltd | Zoom lens of small distortion aberration |
| JPS559550A (en) * | 1978-07-06 | 1980-01-23 | Canon Inc | Zoom lens system |
| JPS56107210A (en) * | 1980-01-31 | 1981-08-26 | Nippon Kogaku Kk <Nikon> | Lens system permitting short-distance photographing |
| JPS575023A (en) * | 1980-06-11 | 1982-01-11 | Minolta Camera Co Ltd | Zoom lens system |
| JPS5897016A (en) * | 1981-12-07 | 1983-06-09 | Mamiya Koki Kk | Wide angle zoom lens |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4730907A (en) * | 1983-12-05 | 1988-03-15 | Olympus Optical Co., Ltd. | Compact zoom lens system |
| JPS61167919A (en) * | 1985-01-21 | 1986-07-29 | Canon Inc | Variable power finder |
| DE3610472A1 (en) * | 1985-03-27 | 1986-10-09 | Ricoh Co., Ltd., Tokio/Tokyo | SMALL ZOOM LENS |
| JPS61240217A (en) * | 1985-04-17 | 1986-10-25 | Asahi Optical Co Ltd | Compact wide angle zoom lens |
| JPH0319526B2 (en) * | 1985-04-17 | 1991-03-15 | Asahi Optical Co Ltd | |
| JPS63210907A (en) * | 1987-02-27 | 1988-09-01 | Asahi Optical Co Ltd | Compact and bright wide-angle zoom lens |
| DE3806161A1 (en) * | 1987-02-27 | 1988-09-08 | Asahi Optical Co Ltd | COMPACT AND LIGHT-STRONG WIDE-ANGLE ZOOM LENS SYSTEM |
| JPH01284819A (en) * | 1988-05-12 | 1989-11-16 | Minolta Camera Co Ltd | Zoom lens |
| JP2002236254A (en) * | 2001-02-09 | 2002-08-23 | Sigma Corp | Zoom lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6161653B2 (en) | 1986-12-26 |
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