JPS5933418A - Focusing method of zoom lens - Google Patents
Focusing method of zoom lensInfo
- Publication number
- JPS5933418A JPS5933418A JP57143075A JP14307582A JPS5933418A JP S5933418 A JPS5933418 A JP S5933418A JP 57143075 A JP57143075 A JP 57143075A JP 14307582 A JP14307582 A JP 14307582A JP S5933418 A JPS5933418 A JP S5933418A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- focusing
- group
- zoom
- 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.)
- Pending
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
- G02B15/163—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
に関し、特にズーミングに際して正の屈折力の物体側の
第ルンズ群を移動させたズームレンズ
ズのりャフォーカスのフォーカッデ一方法に関する。DETAILED DESCRIPTION OF THE INVENTION In particular, the present invention relates to a focusing method for a zoom lens in which the object-side lens group with positive refractive power is moved during zooming.
従来よりフォーカシングを容易に、かつ迅速に行うため
に、中望遠および超望遠レンズにおいては、リヤフォー
カスもしくけインナーフォーカスと呼ばれるツメ−カス
方法が採用すれている。これらのフォーカス方法ｔｒｔ
Ｊ′ｆＪ較的レンズ全長が長く又６喰の重いレンズ等に
おいて、全体レンズの繰出しやｌ’ｌｌｌ玉レンズの繰
出し等でフォーカスを行うとヘリコイドの回転が重くな
っのである。一般には比較的フィルム面に近いレンズ外
径の小さなレンズ群でフォーカシングを行うものである
。Conventionally, in order to perform focusing easily and quickly, a focusing method called rear focusing or inner focusing has been adopted in medium telephoto and super telephoto lenses. These focus methods trt
J'fJ With a relatively long overall lens length and a heavy 6-hole lens, when focusing is performed by extending the entire lens or extending the l'llll lens, the rotation of the helicoid becomes heavy. Generally, focusing is performed using a lens group with a small outer diameter that is relatively close to the film surface.
このリヤフォーカス方法においては、フォーカシング用
のレンズ群に適切な屈折力と光学配置を与えることＫよ
って、光学的カ像性能を劣下させることなく、最至近距
離物点に対するレンズの繰出し量をなるべく小さくする
ことが容易となる。In this rear focusing method, by giving appropriate refractive power and optical arrangement to the focusing lens group, the amount of lens extension with respect to the closest object point can be minimized without deteriorating the optical image performance. It is easy to make it smaller.
このことは、特に自動焦点調節を行う場合、イ）フォー
カシング用のレンズ群が軽量コンパクトであり駆動し、
やすいこと、口）比較的フィルム面に近い位置にあたる
ためカメラ本体からの信号伝達が容易であること、ノ・
）繰出し量が小さくできるので合焦位置検出のだめのフ
ィードバックがかけやすいこと、等の多くの利点を有し
ている。This is especially true when performing automatic focusing, as a) the focusing lens group is lightweight and compact;
(Easy to use, mouth) Since it is located relatively close to the film surface, signal transmission from the camera body is easy.
) It has many advantages, such as the ability to reduce the amount of extension, making it easier to apply feedback for detecting the focus position.
同様にズームレンズにおいても、前述のりャフォーカス
方法の利点はあてはオる。竹に、従来の前玉レンズの繰
出しによるズームレンズにおいて、ズーム比の高倍化、
大口径化を図るとレンズ全長が長くなり又６＋＋玉レン
ズ径が増大するといった問題が生じてくる。Similarly, the advantages of the rear focusing method described above also apply to zoom lenses. Bamboo has a higher zoom ratio than the conventional zoom lens with an extended front lens.
If the aperture is increased, the overall length of the lens becomes longer, and the diameter of the 6++ lens also increases.
従来この問題を改良する一手段として、ズームレンズの
りャフォーカス方法が特開昭５７−７８５１３等で提案
されている。これは従来のｆｊ＋Ｊ玉レンズ繰出しによ
るフォーカス方法にかえて、ズーミング中固定の結像レ
ンズ群中の一部のレンズ群でフォーカシングを行うこと
により、第ルンズ群をズーミング中とフォーカシング中
固定としたものである。Conventionally, as a means to improve this problem, a zoom lens rear focusing method has been proposed in Japanese Patent Application Laid-Open No. 57-78513. Instead of the conventional focusing method of extending the fj+j lens, this method uses a part of the imaging lens group that is fixed during zooming to perform focusing, thereby fixing the 1st lens group during zooming and focusing. It is.
さらにズーム比の高倍化、コンパクト化を図るにはｌ特
開昭５３−３４５３９ 、特開昭５４−２５７４７等で
提案されているように、旧の屈折力の第ルンズ群を、広
角側から望遠１１１リヘスーミングする際に、物体ｆｉ
ｌｌｌに移動させ、変倍用の負の屈折力の第２レンズ群
の変倍比を増大させることが有効である。。Furthermore, in order to increase the zoom ratio and make it more compact, as proposed in Japanese Patent Application Laid-Open Nos. 53-34539 and 1977-25747, the old lens group with refractive power is changed from the wide-angle side to the telephoto side. 111 When rehesuming, the object fi
It is effective to increase the zoom ratio of the second lens group having a negative refractive power for zooming. .
しかしながら、ズーミング中ＩＥの屈折力の第ルンズ群
が移動するズームレンズはフィルム面から第ルンズ群首
での距離が各焦点距離毎に異なり、とのためにフィルム
面より測った同一の物体１ｉ１１ｊｌｌ１１１に対する
フォーカシング用のレンズの繰出し量が各焦点距離毎に
よって外なってくる。このことけ、ある有限５’ｌ’４
ＮＪｉＧ物点に対して。However, in a zoom lens in which the refractive power lens group of the IE moves during zooming, the distance from the film plane to the neck of the lens group differs for each focal length. The amount of extension of the focusing lens varies depending on each focal length. This is a finite 5'l'4
For NJiG object points.
ある任意の焦点距離でフォーカシングを行なった後洗、
ズーミング操作を行うとピント移動が生じることｆ意味
する。After focusing at a certain focal length,
This means that a zooming operation causes a focus shift.
またｐｐ ルンズ？１工“が、広角ＩＩ！１１から晴遠
側ヘズーミングする際に物体１１１１へ移動するタイプ
のズームレンズでは、望遠１（１すの焦点距肖１１時の
軸外斜光束によって決定される前玉レンズの有効径が必
然的に大きくなり、近田離物点に対して前玉レンズの繰
出しを行えば、ｇ＋＋玉レンズの有効径は更に増大する
、
これらの欠点を改良するために上記の６ズー）・レンズ
におい“Ｃ、リヤフォーカス方法ケ適用することが考え
しりする。PP Luns again? In a zoom lens of the type in which the 1st lens moves toward the object 1111 when zooming from the wide-angle II!11 to the clear side, the front lens is The effective diameter of the lens inevitably becomes larger, and if the front lens is extended to the Chikada distance object point, the effective diameter of the g++ lens will further increase. )・I am thinking of applying "C" rear focus method to the lens.
ズームレンズのりャフ十−ノｌス方法Ｃは、ズーミング
による焦点距離の変化に伴い同一の物体距離に対するフ
ォーカシング用のレンズ群の繰出しｈｌが異なり不便で
ある。そこで焦点１離を何んらかの方法で検知し、それ
に対応するレンズの繰出し神を計９から求めたシ又Ｔ
Ｔ Ｌのオートフォーカス装置と組合す方法に上りセ°
ｔり出しｉ葎を決めることができる１、この、嚇合、当
然ながらｉｉＪ ：Ｅレンズを繰り出してフォーカスす
るズームレンズにもこの方法は採用できるが、フォーカ
シング用のレンズ群が犬きく、ｉｌ＜いとノー、駆動手
段が複雑となるだめ、リヤフォーカス方法に適用した方
が好ましい。壕らＫ ＩＪヤフォーカス方法では、フォ
ーカシングに際しｔｎＩＪ玉しンズは固定であるので、
前玉レンズ径は著るしく小さくすることができる。The zoom lens focusing method C is inconvenient because the extension of the focusing lens group for the same object distance varies as the focal length changes due to zooming. Therefore, we detected the focal distance of 1 point using some method, and calculated the corresponding lens extension from a total of 9.
How to combine with T L autofocus device
Of course, this method can also be applied to a zoom lens that focuses by extending the E lens, but the focusing lens group is difficult to focus on. However, since the driving means becomes complicated, it is preferable to use the rear focus method. In the IJ focus method, the tnIJ lenses are fixed during focusing, so
The diameter of the front lens can be significantly reduced.
本発明はフォーカシング用のレンズ枚数を少なくシ、か
つフォーカシ４ングの際のｌ／ンズ群の繰り出し量を少
なくシ、良好に収差補正を行ったコンパクトなズームし
／ンズのフォーカス方法の提供を目的とする。SUMMARY OF THE INVENTION The present invention aims to provide a compact zoom/lens focusing method that reduces the number of focusing lenses, reduces the amount of extension of the l/lens group during focusing, and satisfactorily corrects aberrations. shall be.
本発明の目的を達成する為のレンズ構成の特徴は
物体側より順にズーミングの際移動する正の屈折力の第
ルンズ群、同じく
ズーミングの際移動する少なくとも１つのレンズ群を有
する変倍レンズ群そしてズーミング中固定の結像レンズ
群を有し１、
前記結像レンズ群の焦点距離をｆＲ９
前記結像１／ンズ群中の一部のレンズ群Ｆを移動させて
フォーカシング−Ｊ−ル際、
前記レンズ群Ｆを負の屈折力とし、その焦点距なる条件
を満足することである。The features of the lens configuration for achieving the object of the present invention are, in order from the object side, a first lens group with positive refractive power that moves during zooming, a variable power lens group that also has at least one lens group that moves during zooming, and The imaging lens group 1 is fixed during zooming, and the focal length of the imaging lens group is set to fR9. The objective is to set the lens group F to have a negative refractive power and to satisfy the condition of its focal length.
本発明では物体側の第ルンズ群をズーミング中移動させ
るズームタイプを採用し２、第ルンズ群の後方にある変
倍用レンズ群の移動による変倍比を増大させて所定の変
倍比を効率良く得て、ズームレンズのコンパクト化をし
゛司っている。そしてズーミング中固定のレンズ群の一
部の所定の屈折力を有１７たレンズ群を移動させてフォ
ーカシングを行う方法により前玉レンズ径の増大を防止
している。The present invention employs a zoom type in which the object-side lens group is moved during zooming, and the variable power ratio is increased by moving the variable power lens group located behind the lens group, thereby achieving a predetermined variable power ratio efficiently. This technology has helped make zoom lenses more compact. An increase in the diameter of the front lens is prevented by performing focusing by moving part of the fixed lens group 17 having a predetermined refractive power during zooming.
そして四に条件式（１）を満足させることにより少ない
レンズ枚数でのフォーカスを容易にし、かつレンズ全長
の短縮化を図すつつ良好なる収差補正を達成している。Fourthly, by satisfying conditional expression (1), focusing is facilitated with a small number of lenses, and excellent aberration correction is achieved while shortening the overall lens length.
条件式（１）の上限値を超えると、ナ今至近距ト：１ｆ
物点に対するレンズの繰出し析が大きくなりミレンズ群
間のメカニカルな干渉を防ぐためには、必然的にレンズ
全降を長ぐせねば斥らず、レンズ系のコンパクト性を欠
く。逆に下限値を超えると目１１記フォーカシング用の
し／クズ群の屈折力が強まり、収差補正を良好に行うこ
とが困難となる。If the upper limit of conditional expression (1) is exceeded, the current closest distance: 1f
In order to prevent the mechanical interference between the lens groups due to the large extension of the lens with respect to the object point, it is necessary to lengthen the total descent of the lens, which results in a lack of compactness of the lens system. On the other hand, if the lower limit is exceeded, the refractive power of the 11th lens group for focusing becomes stronger, making it difficult to perform aberration correction satisfactorily.
更に本発明の目的をより１娠＜速成する為にはレンズ群
ｐの物体側には、物体側に凸面を向けたメニスカス状の
レンズ、
像面側には、正の屈折力のレンズを配置し、無限遠物体
から近距離物体へのフォーカスは前記レンズ群Ｆを像面
側方向へ移動させて行うことである２、
これらのレンズは主に、フォーカシングによる収差変動
を除去するために設けたもので、具体的には前記メニス
カス状のレンズはフォーカシング用のレンズ／ｆｆ Ｆ
の４動に伴って生ずる球面収差の変動を補正し、フォー
カシング用のＶクズ群Ｆより像面側に設けられた正の屈
折力のレンズは、前記フォーカシング用のレンズｉＷＦ
の屈折力を強め、近臣ｌｖ！ＩｗＪ点に対するレンズの
繰り出し曖を縮めようとした時に生じる糸巻き型の歪曲
収差を良好に補正するためである〇又しンズＩ’ｌｌ
Ｆより像面側に配置した正の屈折力のレンズを正と角の
屈折力のレンズを貼合わせたレンズ構成とするのが好ま
しく、これによってフォーカシングによる色収差の補正
、特に倍率の色収差を良好に補正している。Furthermore, in order to achieve the object of the present invention even more quickly, a meniscus lens with a convex surface facing the object side is placed on the object side of the lens group p, and a lens with positive refractive power is placed on the image side. However, focusing from an object at infinity to an object at a short distance is performed by moving the lens group F toward the image plane.2 These lenses are mainly provided to eliminate aberration fluctuations caused by focusing. Specifically, the meniscus-shaped lens is a focusing lens/ff F
A lens with a positive refractive power, which corrects fluctuations in spherical aberration caused by the four movements of the focusing lens iWF, and which is provided closer to the image plane than the focusing V lens group F,
Strengthen the refractive power of, close relative level! This is to better correct the pincushion distortion that occurs when trying to reduce the ambiguity in lens extension with respect to the IwJ point.
It is preferable to use a lens configuration in which a lens with a positive refractive power placed closer to the image plane than F is laminated with a lens with a positive refractive power and a lens with an angular refractive power.This allows for good correction of chromatic aberration due to focusing, especially chromatic aberration of magnification. It is being corrected.
更に本発明の目的をより良く達成するにはレンズ群Ｆを
正と負の屈折力のレンズの貼合わせレンズ−するのが好
ましい。これによって少ないレンズ枚数でフォーカシン
グを可能とし更にフォーカシングによる色収差の変動を
少なくしている。Furthermore, in order to better achieve the object of the present invention, it is preferable that the lens group F is a composite lens consisting of lenses having positive and negative refractive powers. This enables focusing with a small number of lenses and further reduces fluctuations in chromatic aberration due to focusing.
伺、結像レンズ群はＩＥの屈折力で構成するのが全ズー
ム範囲にわたり収差補正を１りｆに保ち、更に所定のバ
ックフォーカスを得るのに好ましい。However, it is preferable to configure the imaging lens group with IE refractive power in order to maintain aberration correction at 1 f over the entire zoom range and to obtain a predetermined back focus.
次に本発明の数値実施例を示す、数値実施例においてＲ
ｉは物体側より１１＠に第１番目のレンズ面若しくは反
射鏝の曲率半径ｓ Ｄｒ ｉｔ：物体１１１＋１よセ順
に第ｉ番目のレンズ厚及び空気間隔、Ｎｉとνｉは夫々
物体側より順に第１番目のレンズのガラスの屈折率とア
ツベ数である、
数値実施例１
Ｆ＝８！、５７〜ＩＱ５．９６ ＦＮＯ＝ｌ：４．０
２ω−Ｉ２．６°〜２ｑ、７゜ＴＩ Ｉ−２５３，４
！ｌ ｎ ＋＋−：ｌ、Ｏｎ Ｎ Ｉ＝ １．Ｒｎ
５１ＲシＩ＋＋−２５．４Ｒ２−！Ｉ＋、７１ Ｒ２
−７，１ｎ Ｎ ２−１．！１Ｒ９１３ν２−６１．
ｆｌＲ３−−１７１Ｊ４． ｎ ３ ＝ ０．１
２ｎ ４− ７６．２１ １ ４− ４．０Ｏ
Ｎ ３− ］、ｆｉｌ’＋９＋３ ν ３＝
ｆｔ１．ｆｌｎ ｎ−ＩＲ９，７１ｎ Ｆｌ ＝ ｎ
）’ｙｔｒＲ６−−２９７．１＋ｌ ｎ ６ ＝
＋＋ｅｓ Ｎ ４− １．７１：’ｔＯ（
Ｉ ν ４−’！＋３．８ｎ’７＝ ６０．
５０ ｒ） ７＝ ３．４２ＩＩ Ｒ−−７
３，７Ｆｌ ｎ Ｒ−，１，６５Ｎ ５？−１，７１
３＋１０ １／ ５−５３．８ｎ ９＝ ３Ｒ，４７
ｒｌ ９−４．１０ Ｎ ６−１．Ｆ１０５１８
ジロー２５．４１ Ｈ１＝ ２Ｒ１，Ｆｌ６ １
１１ｆ＋＝−町ｐＴ１１１＝ ｌ０Ｃ４１Ｔａｌ＋
＝ １．７０ Ｎ７−１．６４７６９ １／７
＝３３．ＦＩＲ１２＝、 ３４．３５ ｒｌ
＋２＝ ６．２０ Ｎ ８− １．５２ＩＱ１
３ ９ ８− ６１．（ＩＲＩ３＝ −１３１，（
Ｅ Ｄ＋３ミ 可変Ｆｌ１４＋＋１ ＋１．（
ｌ ｎ＋４＝ ｌＪ３フォーカシングはＲ２
２から１１２４のレンズ１１ｔで行う。Next, numerical examples of the present invention will be shown.
i is the radius of curvature s of the first lens surface or reflection iron from the object side 11@ Drit: the thickness and air distance of the i-th lens in order from the object 111+1, Ni and νi are the first lens surfaces in order from the object side, respectively The refractive index and Atsube number of the glass of the th lens are Numerical Example 1 F=8! , 57~IQ5.96 FNO=l:4.0
2ω-I2.6°~2q, 7°TI I-253,4
! l n ++-: l, On N I=1. Rn
51RshiI++-25.4R2-! I+, 71 R2
-7,1n N 2-1. ! 1R913ν2-61.
flR3--171J4. n3 = 0.1
2n 4- 76.21 1 4- 4.0O
N 3− ], fil'+9+3 ν 3=
ft1. fln n-IR9,71n Fl = n
)'ytrR6--297.1+l n 6 =
++es N 4- 1.71:'tO(
I ν 4-'! +3.8n'7=60.
50 r) 7= 3.42II R--7
3,7Fl n R-, 1,65N 5? -1,71
3+10 1/5-53.8n 9=3R,47
rl 9-4.10 N 6-1. F10518
Jiro 25.41 H1= 2R1, Fl6 1
11f+=-Town pT111= l0C41Tal+
= 1.70 N7-1.64769 1/7
=33. FIR12=, 34.35 rl
+2= 6.20 N 8- 1.52IQ1
3 9 8-61. (IRI3= -131, (
E D+3mi variable Fl14++1 +1. (
l n+4 = lJ3 focusing is R2
This is done using lenses 11t from 2 to 1124.
結像レンズはＲ１５からＲ２７のレンズである。The imaging lenses are lenses R15 to R27.
第ルンズ々’ｒ（：はＲ１からＲ５のレンズ、変倍用レ
ンズｆｆｆｉｌ：Ｒ６からＲ１３までのレンズでＲ６か
らＲＩＯが１つのレンズ群、Ｒ１，ｌからＲ１３が１つ
のレンズ群である。Lens 'r(: is the lens from R1 to R5, zoom lens fffil: is the lens from R6 to R13, R6 to RIO is one lens group, and R1, l to R13 is one lens group.
本実施例の無限遠物点に対するＩｉＶ差図を第３図に、
有限距離物点（１，８ｍ）にフォーカスした時の収差図
を第４図にあげる。との時の繰出し量は広角端の焦点削
離時で２．３５ｍｍ、望遠端の熱点距離時で１４．７０
＋ｎｍである。な訃、本実施例では近距離物点にフォー
カスする場合、広角側と望遠側の焦点距離時の最至近が
離を同一にしたが、必らずしも広角側と望遠側の焦点１
１４１１１１時の最至近Ｗ離を同一にする必要はなく、
広角側の焦点鞭離時には、フォーカシングレンズ群をさ
らに像面側に移動することにより％最至近距離を短縮で
きる７
数値実施例２
Ｆ＝８２．１〜＋９Ｒ，３ＦＮＯ＝１ ＋ ４．５ ２
０＝１２．５°〜２９．５゜ＲＩ＝ ８６．Ｆｌ７
ｎ Ｉ＝ ２．６０ Ｎ Ｉ＝ １
．Ｒ（ＩＦＩＩＲν Ｉ＝ ２５．４Ｒ２＝ ４
５．１１’ｌ ｒｌ ２＝ ９．３０ Ｎ
２＝、 １．６３９３０ ν ２−４４．９
１．３−− −３６６．５５ Ｔ１ ３− Ｉ′
Ｉｆ変Ｒ４＝−１！５９．０７ｎ４−１．４５Ｎ３＝１
．７７２５０’１）３Ｆ４９ＪＲ５＝ ６８．２３
１ ５” ２．３５Ｒ６＝ −４９，（１４Ｉ
Ｉ ６− ２．５０ ７１ ４＝ １．７７２！
ｉｎ ν ４＝ ４９．６Ｒ７＝ ２６．
７８ １１ ７＝ ４．１０ Ｎ Ｓ
−＋ １．８４６６も ν ５＝ ２３．９１
８＝ Ｌ＋４．５９ １ Ｒ豐 可変フォーカシン
グはＲ２０からＲ２２のレンズ群で行う。The IiV difference map for the object point at infinity in this example is shown in Figure 3.
Figure 4 shows the aberration diagram when focusing on a finite distance object point (1.8m). The amount of extension when using is 2.35 mm when the focus is removed at the wide-angle end, and 14.70 mm when the focal point is removed at the telephoto end.
+nm. In addition, in this embodiment, when focusing on a close object point, the closest point at the focal length on the wide-angle side and the telephoto side is the same distance, but the focal length 1 on the wide-angle side and the telephoto side is not necessarily the same.
It is not necessary to make the closest W distance at 141111 the same,
When the focal point is released on the wide-angle side, the closest distance can be reduced by % by moving the focusing lens group further toward the image plane.7 Numerical Example 2 F=82.1 to +9R, 3FNO=1 + 4.5 2
0=12.5°~29.5°RI=86. Fl7
n I= 2.60 N I= 1
．． R(IFIIRν I= 25.4R2= 4
5.11'l rl 2= 9.30 N
2=, 1.63930 ν 2-44.9
1.3-- -366.55 T1 3- I'
If variable R4=-1!59.07n4-1.45N3=1
．． 77250'1) 3F49JR5= 68.23
1 5" 2.35R6= -49, (14I
I 6- 2.50 71 4= 1.772!
in ν 4=49.6R7=26.
78 11 7= 4.10 N S
-+ 1.8466 also ν 5= 23.91
8=L+4.59 1 R 豐 Variable focusing is performed by lens groups R20 to R22.
結像レンズはＲ９からＲ２５のレンズである。The imaging lenses are lenses R9 to R25.
第ルクズ群はＲ１からＲ３のレンズ、変倍用レンズばＩ
２，４からＲ８寸でのレンズである。The lux group consists of lenses R1 to R3, and a variable power lens I.
It is a lens with dimensions from 2.4 to R8.
本実施例の無限遠物点に対する収差［Ａを第５図に、有
限？ｌコ離物点（３ｍ）にフォーカスした時の収差図を
２１３６図に耗１ける。この時の繰出し時
計は広角端の焦点距離♂０．１．６０ｍｍ、望遠ｌＮ１
１の焦点Ｗ離時で９．８４ ｍｍである、。The aberration [A is shown in FIG. 5 for the object point at infinity in this example, and is it finite? The aberration diagram when focusing on the distant object point (3 m) is shown in Figure 2136. The payout clock at this time has a focal length of ♂0.1.60mm at the wide-angle end, and a telephoto lN1.
The focal point W of 1 is 9.84 mm when separated.
第１図、第２図はそれぞれ本発明の数値実施例１，２の
レンズ系の断面図金子し７、第３図。
第４図はそれぞれ数値実施例１の；ｌ！ｔＱ限遠物点時
と近ｌ！１２離物点時の収差図を示せ。（シ’ｌ ｔ
（ＩＩＩ ｌ （Ｃ）はザジクル像面９曲を示す。−１
様に第５図、第６図は数値実施例２の無限遠物点時と近
”■Ｋｒ物点時の収差図を示す。1 and 2 are cross-sectional views of lens systems of numerical examples 1 and 2 of the present invention, respectively. Figure 4 shows ;l! of Numerical Example 1, respectively. tQ infinite object point and near l! 12 Show the aberration diagram at the remote object point. (S'lt
(III l (C) shows nine Zazikul image planes.-1
Similarly, FIGS. 5 and 6 show aberration diagrams when the object point is at infinity and when the object point is near "■Kr" in Numerical Example 2.
Claims (1)
折力の第ルンズ群、同じく ズーミングの際移動する少なくとも１つのレンズ群を有
する変倍レンズ群そしてズーミング中固定の結像レンズ
群を有し、 ｎＩＪ記結像レンし群の焦点距離をｆｌｌ ｓ前記結像
レンズ群中の一部のレンズ群Ｆを移動させてフォーカシ
ングをする際、 Ａｉｌ記レンし群Ｆを角の屈折力と１７、その焦点距離
をｆＦとしだとき なる条件を満足することを特徴とするズームレンズのフ
ォーカス方法。 （２１ｎｉＪ記レンし群Ｆの物体側には物体側に凸面を
向けたメニスカス状のレンズ、 像面側には、正の屈折力のレンズを配置１２、無限遠物
体から近距離物体へのフォーカスは前記レンズ群Ｆを像
面側方向へ移動させて行うことを特徴とする特許請求の
範囲第１項記ス 載のズームレンズのフオープ１７Ｘ＋′−＝ｙ≠方法。 （３） 前記結像レンズ群はｉＥの屈折力を有すると
とを特徴とする特許請求の範囲第１項記載のス ズームレンズのフオーカ！ブイ方法。 （４） 前記レンズ群Ｆを正と負の屈折力の２つのレ
ンズの貼合わせレンズで構成したことを特徴とする特許
請求の範囲第１項記載のズームレンズのフオーカへ≠≠
方法。 △[Claims] (1) In order from the object side, a lens group with positive refractive power that moves during zooming, a variable power lens group that also has at least one lens group that moves during zooming, and a lens group that is fixed during zooming. It has an imaging lens group, and when focusing is performed by moving some of the lens groups F in the imaging lens group, the focal length of the imaging lens group F is set as follows. A focusing method for a zoom lens characterized by satisfying the following conditions: 17. The refractive power of the corner, and the focal length of the lens are fF. (21niJ) A meniscus lens with a convex surface facing the object is placed on the object side of group F, and a lens with positive refractive power is placed on the image side12, focusing from an object at infinity to a close object. The zoom lens fop 17X+'-=y≠ method as recited in claim 1, characterized in that the step is performed by moving the lens group F toward the image plane side. (3) The imaging lens A focusing method for a zoom lens according to claim 1, wherein the group has a refractive power of iE. (4) The lens group F is composed of two lenses having positive and negative refractive powers. To the focuser of a zoom lens according to claim 1, characterized in that it is constructed of a laminated lens of ≠≠
Method. △
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57143075A JPS5933418A (en) | 1982-08-18 | 1982-08-18 | Focusing method of zoom lens |
| US06/522,043 US4650291A (en) | 1982-08-13 | 1983-08-10 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57143075A JPS5933418A (en) | 1982-08-18 | 1982-08-18 | Focusing method of zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5933418A true JPS5933418A (en) | 1984-02-23 |
Family
ID=15330326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57143075A Pending JPS5933418A (en) | 1982-08-13 | 1982-08-18 | Focusing method of zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5933418A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02176614A (en) * | 1988-12-28 | 1990-07-09 | Hitachi Ltd | Automatic focusing device |
| US5241421A (en) * | 1990-01-31 | 1993-08-31 | Canon Kabushiki Kaisha | Zoom lens |
| JP2001188169A (en) * | 1999-12-27 | 2001-07-10 | Asahi Optical Co Ltd | Zoom lens system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52126982U (en) * | 1976-03-19 | 1977-09-27 | ||
| JPS55138985U (en) * | 1979-03-28 | 1980-10-03 |
-
1982
- 1982-08-18 JP JP57143075A patent/JPS5933418A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52126982U (en) * | 1976-03-19 | 1977-09-27 | ||
| JPS55138985U (en) * | 1979-03-28 | 1980-10-03 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02176614A (en) * | 1988-12-28 | 1990-07-09 | Hitachi Ltd | Automatic focusing device |
| US5241421A (en) * | 1990-01-31 | 1993-08-31 | Canon Kabushiki Kaisha | Zoom lens |
| JP2001188169A (en) * | 1999-12-27 | 2001-07-10 | Asahi Optical Co Ltd | Zoom lens system |
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