JPH07140389A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPH07140389A JPH07140389A JP6116066A JP11606694A JPH07140389A JP H07140389 A JPH07140389 A JP H07140389A JP 6116066 A JP6116066 A JP 6116066A JP 11606694 A JP11606694 A JP 11606694A JP H07140389 A JPH07140389 A JP H07140389A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- focusing
- lens group
- closest
- 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
- G02B15/144—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 four groups only
- G02B15/1441—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 four groups only the first group being positive
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】本発明は前玉径の小さいコンパク
トなズームレンズで、特にフォーカシング方式に特徴を
有するズームレンズに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact zoom lens having a small front lens diameter, and more particularly to a zoom lens characterized by a focusing method.
【0002】[0002]
【従来の技術】ズームレンズにおいては、近距離にフォ
ーカシングする際に前玉を前方に移動させる前玉繰出し
のフォーカシング方式が広く採用されている。2. Description of the Related Art In zoom lenses, a front-lens focusing method is widely used in which a front lens is moved forward when focusing at a short distance.
【0003】この前玉繰出しによるフォーカシングにお
いては、最も画角の広い広角端においても周辺光量が低
下しないようにするためには、前玉径を非常に大きくし
なければならない。In focusing by feeding the front lens, the diameter of the front lens must be made extremely large so that the peripheral light amount does not decrease even at the wide-angle end where the angle of view is widest.
【0004】特に最近はズームレンズも大口径比化の傾
向にあり、そのため前玉径が大きくなりがちである。し
たがって前玉繰出しのフォーカシング方式を採用した場
合、前玉径が益々大きくなり好ましくない。即ち、前玉
径が大になるとレンズ系全体が大型になり、重量も増加
して取扱いが不便になる。特に前方に重みがかかると、
カメラに取付けられた時にバランスが悪くなり、ズーム
レンズの機動性が悪くなる。In particular, recently, zoom lenses also tend to have a large aperture ratio, and therefore the front lens diameter tends to be large. Therefore, when the focusing method of feeding the front lens is adopted, the diameter of the front lens is further increased, which is not preferable. That is, when the diameter of the front lens becomes large, the entire lens system becomes large, and the weight also increases, which makes the handling inconvenient. Especially when weight is applied to the front,
When mounted on a camera, the balance is poor and the mobility of the zoom lens is poor.
【0005】以上のことからズームレンズは出来る限り
コンパクトであることが望ましく、そのためには前玉径
が増大しないようにする必要がある。From the above, it is desirable that the zoom lens be as compact as possible, and for that purpose it is necessary to prevent the front lens diameter from increasing.
【0006】従来ズームレンズのフォーカシングに関し
て、特開昭56−48607号、特開昭56−5031
1号等が知られている。これら公報に記載されたものは
第1群を動かすことによってフォーカシングを行なって
いるが、この例の場合は周辺光量を確保するためには第
1群の径を大にしなければならない。またその径の大き
さはフォーカシングの際の第1群の移動量に比例する。
一般に物点の移動と像点の関係は、物点の移動量をΔ
Z,像点の移動量をΔZ’,フォーカシングのために移
動するレンズの倍率をβとすると βZ’=β2 ΔZ にて表わされる。したがってβ2 の大きいところでフォ
ーカシングすれば移動量が少なくてすむ。しかしなが
ら、前記の従来例においては、第1群の倍率はあまり大
きくないため移動量も比較的大きくそのためにも前玉径
が大きくなっている。Regarding focusing of a conventional zoom lens, JP-A-56-48607 and JP-A-56-5031 are used.
No. 1 is known. In the devices described in these publications, focusing is performed by moving the first lens group, but in the case of this example, the diameter of the first lens group must be increased in order to secure the peripheral light amount. The size of the diameter is proportional to the moving amount of the first lens unit during focusing.
Generally, the relationship between the movement of an object point and the image point is Δ
Letting Z be the amount of movement of the image point be ΔZ ′, and β be the magnification of the lens that moves for focusing, then βZ ′ = β 2 ΔZ. Therefore, the amount of movement can be reduced by focusing at a large β 2 . However, in the above-mentioned conventional example, since the magnification of the first group is not so large, the moving amount is also relatively large, and therefore the front lens diameter is also large.
【0007】又前述のように広角端での画角が大きい程
後群に比べて先玉径が大きいという傾向があり、全系を
コンパクトにするためには先玉径を小さくすることが極
めて重要であり、したがって特に広角なズームレンズで
は、前記のようなフォーカシング方式は好ましくない。As described above, the larger the angle of view at the wide-angle end, the larger the front lens diameter as compared with the rear lens group, and it is extremely important to reduce the front lens diameter in order to make the entire system compact. Therefore, the focusing method as described above is not preferable for a wide-angle zoom lens.
【0008】[0008]
【発明が解決しようとする課題】本発明は以上の事情に
鑑みなされたもので、前玉径が小さくコンパクトで移動
量が少なく極近接物点までフォーカシング可能なズーム
レンズを得ることを目的とするもので、最も像側に正の
屈折力を有するレンズ群を配置したズームレンズで、こ
の最も像側のレンズ群を二つに分けそのうちの一方を移
動させることによってフォーカシングを行なうようにし
たズームレンズのフォーカシング方式を提供するもので
ある。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a zoom lens having a small front lens diameter, a compact size, a small amount of movement, and focusing to an extremely close object point. A zoom lens in which a lens unit having a positive refracting power is arranged closest to the image side, and the lens unit closest to the image side is divided into two and one of them is moved to perform focusing. It provides a focusing method of.
【0009】[0009]
【課題を解決するための手段】即ち本発明におけるズー
ムレンズは、最も像面側に正の屈折力を有するレンズ群
を配置した複数のレンズ群よりなるものであって、前記
の最も像面側に配置した正の屈折力を有するレンズ群を
二つのレンズ群に分け、そのうちの一方のレンズ群を移
動させてフォーカシングを行なうようにしたもので、又
前記のように二つに分けたレンズ群のうちの一方のレン
ズ群の移動と同時に最も物体側に配置したレンズ群を移
動させて極近接物点までフォーカシングを行なうように
したレンズ系である。That is, the zoom lens according to the present invention comprises a plurality of lens groups in which a lens group having a positive refractive power is arranged closest to the image plane, The lens group having a positive refracting power arranged in 2 is divided into two lens groups, and one of the lens groups is moved for focusing, and the lens group divided into two as described above. At the same time as the movement of one of the lens groups, the lens group arranged closest to the object side is moved to perform focusing to the closest object point.
【0010】更に本発明では、レンズ系中の最も物体側
に配置されたレンズ群の焦点距離をf1 とし、前記のフ
ォーカシング時に移動するレンズ群の倍率をβとする
時、次の関係を満足するものである。Further, in the present invention, when the focal length of the lens unit arranged closest to the object in the lens system is f 1 and the magnification of the lens unit that moves during focusing is β, the following relationship is satisfied. To do.
【0011】|fT /f1 |<β ただしfT は望遠端における全系の焦点距離である。| F T / f 1 | <β where f T is the focal length of the entire system at the telephoto end.
【0012】第1図は、本発明の一実施例を示すもので
四つのレンズ群よりなるズームレンズに本発明で用いて
いるフォーカシング方式を適用したもので、レンズ系の
基 図面に示すように各群を移動させることによってズーミ
ングを行なうズームレンズである。そしてこのズームレ
ンズのうち最も像側に配置された正の屈折力を有 限遠物点から至近距離物点へとフォーカシングして行
く。FIG. 1 shows an embodiment of the present invention in which the focusing system used in the present invention is applied to a zoom lens composed of four lens groups. It is a zoom lens that performs zooming by moving each group as shown in the drawing. This zoom lens has the positive refractive power, which is the closest to the image side. Focusing from the distance object to the closest object.
【0013】次に前述のように移動するレンズ群の倍率
は大きい方がフォーカシングのための移動量が少なくて
すむ。したがって移動するレンズ群(第1図に示す例の
場 以後の倍率|fT /f1 |(f1 は第1群の合成焦点距
離、fT は望遠端における全系の焦点距離)よりも大に
することによって移動量を従来方式よりも大巾に小さく
することが出来る。そしてこのことによって一層前玉径
を小さくすることが出来る。即ち、前記の条件を満足せ
しめることによって、前玉径を小さくすることが出来、
レンズ系を極めてコンパクトになし得る。As described above, the larger the magnification of the moving lens unit, the smaller the amount of movement for focusing. Therefore, the moving lens group (in the case of the example shown in FIG. Subsequent magnification | f T / f 1 | ( f 1 is the composite focal length of the first group, f T is the focal length of the entire system at the telephoto end) greatly the amount of movement than the conventional method by the larger than It can be made very small. And by this, the front lens diameter can be further reduced. That is, by satisfying the above conditions, the front lens diameter can be reduced,
The lens system can be made extremely compact.
【0014】この条件を満足しない場合、前玉径が大き
くなり好ましくない。If this condition is not satisfied, the front lens diameter becomes large, which is not preferable.
【0015】更に第1群にもフォーカシング機能をもた
せ、最も像側のレンズ群を分割した各レンズ群のうちの
一方を移動させると同時に第1群も移動させることによ
って極近接物点までフォーカシングさせることが出来
る。しかも極近接物点までフォーカシング可能なズーム
レンズとしてはレンズの径の小さいコンパクトなレンズ
系が設計し得る。Further, the first group is also provided with a focusing function, and one of the lens groups obtained by dividing the lens group closest to the image side is moved, and at the same time, the first group is also moved so as to focus up to the closest object point. You can In addition, a compact lens system with a small lens diameter can be designed as a zoom lens capable of focusing up to an extremely close object point.
【0016】例えば第1図に示す基本構成のズームレン
ズにおいて第2図に示すよう 可能なズームレンズが得られる。For example, in the zoom lens having the basic structure shown in FIG. 1, as shown in FIG. A possible zoom lens is obtained.
【0017】次に以上の基本構成を有する本発明におけ
るズームレンズの実施例を示す。第3図は本発明の一実
施例の断面図であって、このレンズ系のデーターは下記
の通りである。Next, an embodiment of the zoom lens according to the present invention having the above basic structure will be described. FIG. 3 is a sectional view of an embodiment of the present invention, and the data of this lens system are as follows.
【0018】 f=36〜101 ,F/4 r1 =336.568 d1 =2.5 n1 =1.75520 ν1 =27.51 r2 =51.2875 d2 =1.5 r3 =52.8538 d3 =7.8 n2 =1.69350 ν2 =53.23 r4 =-257.2847 d4 =0.1 r5 =44.5048 d5 =4.7 n3 =1.58913 ν3 =60.97 r6 =168.3003 d6 =D1 (可変) r7 =152.7245 d7 =1.5 n4 =1.77250 ν4 =49.66 r8 =19.3909 d8 =2.9 r9 =46.1614 d9 =3.5 n5 =1.76182 ν5 =26.55 r10=-34.35 d10=1.2 n6 =1.78590 ν6 =44.18 r11=75.0166 d11=1.6 r12=-34.7288 d12=1.2 n7 =1.69350 ν7 =53.23 r13=16.2332 d13=3.5 n8 =1.83400 ν8 =37.16 r14=72.3062 d14=D2 (可変) r15=∞(絞り) d15=1.5 r16=32.3180 d16=4.1 n9 =1.57250 ν9 =57.76 r17=-52.2151 d17=0.11 r18=60.1866 d18=2.4 n10=1.6910 ν10=54.84 r19=-147.8576 d19=1.6 r20=-34.8713 d20=1.2 n11=1.78472 ν11=25.68 r21=1241.5930 d21=D3 (可変) r22=44.5951 d22=3.4 n12=1.69680 ν12=55.52 r23=-59.0046 d23=D4 (可変) r24=-29.1382 d24=1.2 n13=1.80610 ν13=40.95 r25=42.7114 d25=1.8 r26=-124.4920 d26=3.17 n14=1.65830 ν14=57.33 r27=-27.9011 d27=0.1 r28=272.8908 d28=2.95 n15=1.65830 ν15=57.33 r29=-57.0148 f1 =73.335,f2 =-17.412 ,f3 =41.370,f4 =59.807 ただしfは全系の焦点距離、r1 ,r2 ,・・・r29は
レンズ各面の曲率半径、d1,d2 ,・・・d28は各レ
ンズの肉厚および空気間隔、n1, n2 ,・・・n15
は各レンズの屈折率、ν1 ,ν2 ,・・・ν15は各レン
ズのアッベ 合成焦点距離である。F = 36 to 101, F / 4 r 1 = 336.568 d 1 = 2.5 n 1 = 1.75520 ν 1 = 27.51 r 2 = 51.2875 d 2 = 1.5 r 3 = 52.8538 d 3 = 7.8 n 2 = 1.69350 ν 2 = 53.23 r 4 = -257.2847 d 4 = 0.1 r 5 = 44.5048 d 5 = 4.7 n 3 = 1.58913 ν 3 = 60.97 r 6 = 168.3003 d 6 = D 1 (variable) r 7 = 152.7245 d 7 = 1.5 n 4 = 1.77250 ν 4 = 49.66 r 8 = 19.3909 d 8 = 2.9 r 9 = 46.1614 d 9 = 3.5 n 5 = 1.76182 v 5 = 26.55 r 10 = -34.35 d 10 = 1.2 n 6 = 1.78590 v 6 = 44.18 r 11 = 75.0166 d 11 = 1.6 r 12 = -34.7288 d 12 = 1.2 n 7 = 1.69350 ν 7 = 53.23 r 13 = 16.2332 d 13 = 3.5 n 8 = 1.83400 ν 8 = 37.16 r 14 = 72.3062 d 14 = D 2 (variable) r 15 = ∞ (stop) d 15 = 1.5 r 16 = 32.3180 d 16 = 4.1 n 9 = 1.57250 ν 9 = 57.76 r 17 = -52.2151 d 17 = 0.11 r 18 = 60.1866 d 18 = 2.4 n 10 = 1.6910 ν 10 = 54.84 r 19 = -147.8576 d 19 = 1.6 r 20 -34.8713 d 20 = 1.2 n 11 = 1.78472 ν 11 = 25.68 r 21 = 1241.5930 d 21 = D 3 ( variable) r 22 = 44.5951 d 22 = 3.4 n 12 = 1.69680 ν 12 = 55.52 r 23 = -59.0046 d 23 = D 4 (variable) r 24 = -29.1382 d 24 = 1.2 n 13 = 1.80610 ν 13 = 40.95 r 25 = 42.7114 d 25 = 1.8 r 26 = -124.4920 d 26 = 3.17 n 14 = 1.65830 ν 14 = 57.33 r 27 = -27.9011 d 27 = 0.1 r 28 = 272.8908 d 28 = 2.95 n 15 = 1.65830 ν 15 = 57.33 r 29 = -57.0148 f 1 = 73.335, f 2 = -17.412, f 3 = 41.370, f 4 = 59.807 where f is The focal length of the entire system, r 1 , r 2 , ... R 29 are the radii of curvature of each lens surface, d 1 , d 2 , ... D 28 are the wall thickness and air gap of each lens, and n 1 , n 2 , ... n 15
Is the refractive index of each lens, ν 1 , ν 2 , ... ν 15 is the Abbe of each lens The combined focal length.
【0019】上記の構成のズームレンズは、第1図に示
すように各群を移動させてズーミングを行なう。このズ
ーミングの際の間隔D1 ,D2 ,D3 ,D4 はワイド
(f=36.22 )、スタンダード(f=60.588)、テレ
(f=101.35)において下記の通りである。In the zoom lens having the above-mentioned structure, each group is moved for zooming as shown in FIG. The intervals D 1 , D 2 , D 3 , and D 4 during this zooming are as follows for wide (f = 36.22), standard (f = 60.588), and tele (f = 101.35).
【0020】 D1 D2 D3 D4 ワイド 0.821 14.339 9.512 4.442 スタンダード 12.357 7.413 4.901 4.442 テレ 22.449 1.429 0.794 4.442 又、上記データーのズームレンズにおいて、(1)従来
行なわれている前玉 ングする場合の夫々における間隔D1 ,D4 および第1
面主光線高は次の通りである。ただし物体距離1.5m
でワイド端の場合である。D 1 D 2 D 3 D 4 Wide 0.821 14.339 9.512 4.442 Standard 12.357 7.413 4.901 4.442 Tele 22.449 1.429 0.794 4.442 Moreover, in the zoom lens of the above data, (1) the front lens which is conventionally performed The distances D 1 , D 4 and the first in each case
The chief ray heights are as follows. However, the object distance is 1.5m
At the wide end.
【0021】 D1 D4 第1面主光線高 (1) 4.951 4.442 22.32 (2) 0.821 5.072 18.35 (3) 1.821 4.922 19.31 率βのテレ端での値は下記の通りである。D 1 D 4 First surface chief ray height (1) 4.951 4.442 22.32 (2) 0.821 5.072 18.35 (3) 1.821 4.922 19.31 The value of the ratio β at the tele end is as follows.
【0022】fT /f1 = 1.38 、β= 3 、β/|
fT /f1 |= 2.17 このデーターより明らかなように本発明の方法による場
合はいずれも従来の前玉繰出しの方法に比べて移動量が
少なくてすむ。又第1面主光線高は小であって、前玉径
を1割以上小さくすることが可能である。F T / f 1 = 1.38, β = 3, β / │
f T / f 1 | = 2.17 As is clear from this data, in any case of the method of the present invention, the movement amount is smaller than that of the conventional front lens feeding method. Moreover, the height of the chief ray on the first surface is small, and the diameter of the front lens can be reduced by 10% or more.
【0023】[0023]
【発明の効果】本発明のズームレンズは、前玉径が小さ
くコンパクトで、更にフォーカシングの際のレンズの移
動量が小でしかも極近接物点までフォーカシングが可能
なレンズ系である。The zoom lens of the present invention is a lens system which has a small front lens diameter, is compact, and has a small amount of movement of the lens during focusing, and is capable of focusing to an extremely close object point.
【図1】本発明のズームレンズの基本構成の一例を示す
図FIG. 1 is a diagram showing an example of a basic configuration of a zoom lens of the present invention.
【図2】上記ズームレンズのフォーカシングの際のレン
ズ群の移動状況を示す図FIG. 2 is a diagram showing a moving state of lens groups during focusing of the zoom lens.
【図3】本発明におけるズームレンズの一実施例の断面
図FIG. 3 is a sectional view of an embodiment of the zoom lens according to the present invention.
Claims (2)
配置した複数のレンズ群からなるズームレンズにおい
て、前記最も像側に配置されたレンズ群を2つのレンズ
群に分け、その内のいずれか一方のレンズ群を移動させ
ると共にレンズ系中の最も物体側に配置されたレンズ群
を移動させることによりフォーカシングを行ない、更に
以下の条件を満足するズームレンズ。 |fT /f1 |<β 但し、f1 は前記最も物体側のレンズ群の焦点距離、f
T は望遠端における全系の焦点距離、βは前記最も像側
の正の屈折力のレンズ群の内のフォーカシングのために
移動するレンズ群の倍率である。1. A zoom lens comprising a plurality of lens groups in which a lens group having a positive refracting power is disposed closest to the image side, and the lens group disposed closest to the image side is divided into two lens groups. A zoom lens that performs focusing by moving either one of the lens groups and the lens group disposed closest to the object side in the lens system, and further satisfies the following conditions. | F T / f 1 | <β where f 1 is the focal length of the lens unit closest to the object side, and f
T is the focal length of the entire system at the telephoto end, and β is the magnification of the lens unit that moves for focusing within the lens unit having the positive refractive power closest to the image side.
レンズ群に分け、その内の負のレンズ群を像側へ移動さ
せると共に、前記最も物体側のレンズ群を物体側へ移動
させることにより近距離へのフォーカシングを行なうよ
うにした請求項1のズームレンズ。2. The most image-side lens group is divided into two lens groups, a positive lens group and a negative lens group, and the negative lens group among them is moved to the image side, and the most object-side lens group is moved to the object side. The zoom lens according to claim 1, wherein focusing is performed to a short distance by moving the zoom lens.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6116066A JP2584416B2 (en) | 1994-05-06 | 1994-05-06 | Zoom lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6116066A JP2584416B2 (en) | 1994-05-06 | 1994-05-06 | Zoom lens |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57061777A Division JPS58179810A (en) | 1982-02-10 | 1982-04-15 | Focusing system of zoom lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07140389A true JPH07140389A (en) | 1995-06-02 |
JP2584416B2 JP2584416B2 (en) | 1997-02-26 |
Family
ID=14677871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6116066A Expired - Lifetime JP2584416B2 (en) | 1994-05-06 | 1994-05-06 | Zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2584416B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005181556A (en) * | 2003-12-18 | 2005-07-07 | Sigma Corp | Large diameter zoom lens |
US7859767B2 (en) | 2008-02-19 | 2010-12-28 | Canon Kabushiki Kaisha | Zoom lens and imaging device having the same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5415760A (en) * | 1977-07-06 | 1979-02-05 | Minolta Camera Co Ltd | Two-component wide angle zoom lens system of divergent refractive power group precedence type |
-
1994
- 1994-05-06 JP JP6116066A patent/JP2584416B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5415760A (en) * | 1977-07-06 | 1979-02-05 | Minolta Camera Co Ltd | Two-component wide angle zoom lens system of divergent refractive power group precedence type |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005181556A (en) * | 2003-12-18 | 2005-07-07 | Sigma Corp | Large diameter zoom lens |
US7859767B2 (en) | 2008-02-19 | 2010-12-28 | Canon Kabushiki Kaisha | Zoom lens and imaging device having the same |
Also Published As
Publication number | Publication date |
---|---|
JP2584416B2 (en) | 1997-02-26 |
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Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960820 |