JPH0511183A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPH0511183A JPH0511183A JP3185336A JP18533691A JPH0511183A JP H0511183 A JPH0511183 A JP H0511183A JP 3185336 A JP3185336 A JP 3185336A JP 18533691 A JP18533691 A JP 18533691A JP H0511183 A JPH0511183 A JP H0511183A
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- JP
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- Prior art keywords
- lens
- group
- negative
- convex surface
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はズームレンズに関し、特
にマイクロフィルムリーダー、プリンター、マイクロ撮
影等に好適な物像間距離を一定に有限距離に維持した状
態において変倍を行った投影用の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 zoom lens, and more particularly to a zoom for projection, which is suitable for micro film readers, printers, micro photography, etc. It is about lenses.
【０００２】[0002]
【従来の技術】従来よりマイクロフィルムリーダー、プ
リンター、複写機等の投影光学系において、物像間距離
を一定の有限距離に維持しつつ、変倍を行い投影倍率を
連続的に得るようにした投影用のズームレンズが種々と
提案されている。2. Description of the Related Art Conventionally, in a projection optical system such as a microfilm reader, a printer, a copier, etc., while keeping the distance between objects and images at a fixed finite distance, zooming is performed to continuously obtain a projection magnification. Various zoom lenses for projection have been proposed.
【０００３】このズームレンズは複数個の固定焦点レン
ズを回転させるターレット方式に比べ投影倍率が連続的
に迅速にしかも容易に得られるという特徴がある。例え
ば特開昭６２−２８０８１４号公報や特開平２−１０５
２１１号公報等ではスクリーン側（拡大側）より順に負
の屈折力の第１群と正の屈折力の第２群の２つのレンズ
群を有し、物像間距離を一定の有限距離に保ち、両レン
ズ群の間隔を変えて変倍を行った所謂２群タイプの投影
用のズームレンズを開示している。This zoom lens is characterized in that the projection magnification can be obtained continuously, quickly and easily as compared with the turret system in which a plurality of fixed focus lenses are rotated. For example, JP-A-62-280814 and JP-A-2-105.
No. 211 and the like have two lens groups, a first group having a negative refracting power and a second group having a positive refracting power, in order from the screen side (enlargement side), and keep the object-image distance at a fixed finite distance. , A so-called two-group type zoom lens for projection in which zooming is performed by changing the distance between both lens groups.
【０００４】[0004]
【発明が解決しようとする課題】一般にマイクロフィル
ムリーダー、プリンター等の投影光学系に用いられるズ
ームレンズはズームレンズのスクリーン（拡大）側の射
出口に回動可能の像回転プリズムを配置して投影像を所
定角度回転させてスクリーン面及び感光性ドラム面上に
選択的に投影している。Generally, a zoom lens used in a projection optical system of a microfilm reader, a printer or the like is projected by disposing a rotatable image rotating prism at an exit of a zoom lens on a screen (enlargement) side. The image is rotated by a predetermined angle and selectively projected on the screen surface and the photosensitive drum surface.
【０００５】このときズームレンズの明るさを一定に維
持しつつズームレンズを射出した光束を光束のケラレを
防止しつつ像回転プリズムを介し、所定方向に回転させ
てスクリーン面又は感光性ドラム面上に選択的に投影し
ようとすると、像回転プリズム及びズームレンズが大型
化してくるという問題点があった。At this time, while keeping the brightness of the zoom lens constant, the light beam emitted from the zoom lens is rotated in a predetermined direction through the image rotation prism while preventing the light beam from being vignetted, and is rotated on the screen surface or the photosensitive drum surface. However, there is a problem that the image rotating prism and the zoom lens become large in size when the image is selectively projected onto the screen.
【０００６】特に拡大側から見たとき変倍に伴う瞳位置
変動量が大きくなるタイプのズームレンズでは光束のケ
ラレを効果的に防止する為に大型化の像回転プリズムを
用いなければならなく光学系全体が大型化してくるとい
う問題点があった。In particular, in a zoom lens of a type in which the amount of pupil position variation associated with zooming becomes large when viewed from the magnification side, a large-sized image rotating prism must be used in order to effectively prevent light beam vignetting. There was a problem that the whole system became large.
【０００７】本発明はマイクロフィルムリーダープリン
ター等に適用したとき変倍に伴う瞳変動量が少なく、小
型の像回転プリズムの使用が可能でかつレンズ系全体が
小型で結像性能が良好な投影用のズームレンズの提供を
目的とする。When the present invention is applied to a microfilm reader printer or the like, the amount of pupil variation due to zooming is small, a small image rotation prism can be used, and the entire lens system is small and for good imaging performance. The objective is to provide a zoom lens.
【０００８】本発明の更なる目的は物像間距離を一定の
有限距離に維持したまま連続的に投影倍率、例えば５５
倍程度へと変化させたズーム比が１．８倍程度の高解像
力のズームレンズの提供にある。A further object of the present invention is to continuously project a projection magnification, for example, 55 while maintaining the object-image distance at a constant finite distance.
The purpose of the present invention is to provide a zoom lens having a high resolution with a zoom ratio of about 1.8, which has been changed to about double.
【０００９】[0009]
【課題を解決するための手段】本発明のズームレンズ、
拡大側より順に負の屈折力の第１群と正の屈折力の第２
群の２つのレンズ群を有し、両レンズ群の間隔を変化さ
せて変倍を行うズームレンズにおいて、該第１群は拡大
側に凸面を向けたメニスカス状の負の第１レンズ、両レ
ンズ面が凹面の負の第２レンズ、拡大側に凸面を向けた
正の第３レンズを有し、該第２群は絞り、拡大側に比べ
縮小側に強い屈折面を向けた両レンズ面が凸面の第４レ
ンズ、縮小側に凸面を向けたメニスカス状の負の第５レ
ンズ、両レンズ面が凸面の第６レンズ、拡大側に凸面を
向けたメニスカス状の正の第７レンズ、拡大側に凸面を
向けたメニスカス状の負の第８レンズ、両レンズ面が凸
面の第９レンズ、両レンズ面が凹面の第１０レンズ、そ
して縮小側に比べて拡大側に強い屈折面を向けた両レン
ズ面が凸面の第１１レンズを有していることを特徴とし
ている。A zoom lens according to the present invention,
The first group of negative refracting power and the second group of positive refracting power in order from the expansion side
In a zoom lens which has two lens groups of a group and performs zooming by changing an interval between both lens groups, the first group is a negative meniscus first lens with a convex surface facing the enlargement side, both lenses It has a negative second lens with a concave surface and a positive third lens with a convex surface facing the magnification side, and the second group is a diaphragm, and both lens surfaces with a strong refracting surface facing the reduction side compared to the magnification side are Convex fourth lens, negative meniscus fifth lens with convex convex surface on the reduction side, sixth lens with convex lens surfaces on both sides, positive meniscus seventh lens with convex convex surface on the expansion side, magnification side A negative meniscus eighth lens with a convex surface facing the lens, a ninth lens with a convex lens surface on both sides, a tenth lens with a concave lens surface on both sides, and a lens with a strong refracting surface on the enlargement side as compared to the reduction side. It is characterized in that it has an eleventh lens having a convex lens surface.
【００１０】特に本発明では、前記ズームレンズは物像
間距離を一定に維持した状態で使用されていることを特
徴としている。In particular, the present invention is characterized in that the zoom lens is used with the object-image distance kept constant.
【００１１】[0011]
【実施例】図１〜図３は本発明の数値実施例１〜３のレ
ンズ断面図である。図４〜図６は本発明の数値実施例１
〜３の諸収差図、収差図において（Ａ）は広角端、
（Ｂ）は望遠端である。1 to 3 are cross-sectional views of lenses according to Numerical Examples 1 to 3 of the present invention. 4 to 6 are numerical examples 1 of the present invention.
3A to 3D, in the aberration diagrams, (A) is the wide-angle end,
(B) is the telephoto end.
【００１２】図１においてＬ１は負の屈折力の第１群、
Ｌ２は正の屈折力の第２群、矢印は短焦点端より長焦点
端への変倍を行う際の各レンズ群の移動方向を示す。第
１群Ｌ１側が拡大側であり、第２群Ｌ２側が縮小側であ
る。Ｇは投影系として用いたときの押え板ガラスであ
る。In FIG. 1, L1 is the first group of negative refractive power,
L2 is the second lens unit having a positive refractive power, and the arrow indicates the moving direction of each lens unit when zooming from the short focal end to the long focal end. The first group L1 side is the enlargement side, and the second group L2 side is the reduction side. G is a holding plate glass when used as a projection system.
【００１３】本実施例では図１〜図３に示すように拡大
側の第１群を所定形状の３つのレンズより構成し、縮小
側の第２群を所定形状の８つのレンズより構成し、物像
間距離を一定の有限距離に維持しつつ、２つのレンズ群
Ｌ１，Ｌ２の間隔を変化させて変倍を行うことにより投
影倍率を連続的に変化させている。これにより種々の投
影倍率で画面全体にわたり変倍の際の収差変動の少ない
高い解像力を有したズームレンズを得ている。In this embodiment, as shown in FIGS. 1 to 3, the first group on the enlargement side is composed of three lenses of a predetermined shape, and the second group on the reduction side is composed of eight lenses of a predetermined shape, The projection magnification is continuously changed by changing the distance between the two lens groups L1 and L2 while changing the distance between the two lens groups L1 and L2 while maintaining the object-image distance at a fixed finite distance. As a result, a zoom lens having various resolutions and high resolving power with little aberration variation during zooming over the entire screen is obtained.
【００１４】尚、本実施例で拡大側とは任意のズーム位
置で物点と像点の２つの共役点をとったときズームレン
ズの主点より遠方の共役点が存在する側をいう。縮小側
とはこの逆の側をいう。In the present embodiment, the enlargement side means the side where a conjugate point far from the principal point of the zoom lens exists when two conjugate points of the object point and the image point are taken at an arbitrary zoom position. The reduction side is the opposite side.
【００１５】次に本発明のズームレンズのレンズ構成の
特徴について説明する。Next, the features of the lens configuration of the zoom lens of the present invention will be described.
【００１６】拡大側より負の屈折力の第１群を拡大側に
凸面を向けたメニスカス状の負の第１レンズと所定の間
隔をおいて両レンズ面が凹面の負の第２レンズと縮小側
に比べて拡大側に強い屈折力の凸面を向けた正の第３レ
ンズの３つのレンズより構成し、特に第１レンズと第２
レンズとの間隔をあけることにより、第２群で補正不足
となるコマ収差を補正している。又第１群の負の屈折力
を２枚の負の第１、第２レンズに分担させることによ
り、変倍に伴なう収差変動が少なくなるようにしてい
る。The first group having a negative refracting power from the magnification side and the negative second lens having a concave meniscus surface at a predetermined distance from the first meniscus-shaped negative lens having a convex surface on the magnification side The third lens is a positive third lens having a convex surface having a stronger refracting power toward the magnifying side than the other side, and particularly the first lens and the second lens.
By spacing a distance from the lens, coma aberration, which is undercorrected in the second group, is corrected. Further, the negative refracting power of the first group is shared by the two negative first and second lenses, so that the variation of aberration due to the magnification change is reduced.
【００１７】第２群を最も広い空気間隔を境にして前述
したレンズ形状の正、負、正、そして正の屈折力の第４
レンズから第７レンズまでの４つのレンズより成る前方
レンズ群と負、正、負、そして正の屈折力の第８レンズ
から第１１レンズまでの４つのレンズより成る後方レン
ズ群とから構成している。The fourth lens unit having the above-mentioned lens shapes of positive, negative, positive, and positive refracting powers with the widest air gap as the boundary of the second unit.
A front lens group consisting of four lenses from the lens to the seventh lens and a rear lens group consisting of four lenses from the eighth lens to the eleventh lens having negative, positive, negative and positive refractive powers. There is.
【００１８】特に前方レンズ群の４つのレンズのレンズ
構成を前述の如く設定し、球面収差やコマ収差等の諸収
差を良好に補正している。又第４レンズと第５レンズと
の間の強い曲率面同士より形成される空気レンズの屈折
力を適切に設定することにより、主に球面収差と軸上色
収差を良好に補正している。In particular, the lens construction of the four lenses of the front lens group is set as described above, and various aberrations such as spherical aberration and coma are favorably corrected. Further, by properly setting the refracting power of the air lens formed by the strong curvature surfaces between the fourth lens and the fifth lens, mainly spherical aberration and axial chromatic aberration are favorably corrected.
【００１９】後方レンズ群のレンズ構成、特に第７レン
ズのレンズ形状を前述の如く設定することにより非点収
差を良好に補正している。Astigmatism is satisfactorily corrected by setting the lens configuration of the rear lens group, particularly the lens shape of the seventh lens as described above.
【００２０】又、後方レンズ群を負、正、負、そして正
の屈折力の４つのレンズより構成し、長いバックフォー
カスを確保しつつ、非点収差とコマ収差をバランス良く
補正している。The rear lens group is composed of four lenses having negative, positive, negative and positive refracting powers, and astigmatism and coma aberration are corrected in good balance while ensuring a long back focus.
【００２１】負の第８レンズと負の第１０レンズとの間
に両レンズ面が凸面の第９レンズを接近して配置するこ
とにより、強い曲率の凹面より発生する諸収差、特に非
点収差を該第９レンズの凸面で補正している。By arranging the ninth lens, whose both lens surfaces are convex surfaces, close to each other between the negative eighth lens and the negative tenth lens, various aberrations, particularly astigmatism, generated by the concave surface having a strong curvature are provided. Is corrected by the convex surface of the ninth lens.
【００２２】正の第１１レンズは第１０レンズから多少
離して配置し、主に非点隔差とコマ収差をバランス良く
補正している。The positive eleventh lens is arranged at a distance from the tenth lens, and mainly corrects astigmatism and coma in a good balance.
【００２３】この他本発明では絞りを第２群の拡大側直
前に配置し、変倍に伴い第２群と一体的に移動させてい
る。これにより変倍に伴う拡大側の瞳位置移動を極力少
なくし、良好なる光学性能が容易に得られるようにして
いる。又変倍の際の第２群の結像倍率を低倍から等倍付
近まで変化するように各要素の屈折力等を設定し、第２
群の移動量を少なくし、主に変倍に伴う非点隔差及びコ
マ収差の変動を良好に補正している。In addition to this, in the present invention, the aperture stop is arranged immediately before the enlargement side of the second group, and is moved integrally with the second group as the magnification changes. As a result, the movement of the pupil position on the enlargement side due to zooming is minimized, and good optical performance is easily obtained. Further, the refractive power of each element is set so that the image forming magnification of the second lens group during zooming is changed from low magnification to near unity magnification.
The amount of movement of the group is reduced, and the fluctuations of astigmatic difference and coma aberration, which are mainly associated with zooming, are well corrected.
【００２４】以上の如く各レンズのレンズ形状を特定す
ることにより本発明の目的とするズームレンズは達成さ
れるが、本発明において更に画面全体の光学性能を良好
に維持し、高い光学性能のズームレンズを確保する為に
は、拡大側から数えて第ｉ番目の空気間隔又はレンズ厚
をＤｉ、第ｉレンズの材質のアッベ数をνｉ、前記第８
レンズと第９レンズとから形成される空気レンズの焦点
距離をｆａ１、前記第９レンズと第１０レンズとから形
成される空気レンズの焦点距離をｆａ２、望遠側におけ
る前記第２群の結像倍率をβ２Ｔ、広角端における全系
の焦点距離をｆｗとしたとき、
０．８５＜｜β２Ｔ｜＜１．３ ‥‥‥‥（１）
（但し β２Ｔ＜０）
０．３ ＜Ｄ２／ｆｗ＜０．５ ‥‥‥‥（２）
０．６＜｜１／ｆａ１＋１／ｆａ２｜・ｆｗ＜０．９ ‥‥‥‥（３）
（但し ｆａ１＜０ ， ｆａ２＜０）
０．０７＜Ｄ２１／ｆｗ＜０．１５ ‥‥‥‥（４）
１８＜ν１１−ν１０＜３２ ‥‥‥‥（５）
なる条件を満足することが好ましい。The zoom lens which is the object of the present invention can be achieved by specifying the lens shape of each lens as described above. However, in the present invention, the optical performance of the entire screen is further maintained well and the zoom of high optical performance is achieved. In order to secure the lens, the i-th air space or lens thickness counted from the enlargement side is Di, the Abbe number of the material of the i-th lens is νi,
The focal length of the air lens formed by the lens and the ninth lens is fa1, the focal length of the air lens formed by the ninth lens and the tenth lens is fa2, and the imaging magnification of the second group on the telephoto side. Is β2T and the focal length of the entire system at the wide-angle end is fw: 0.85 <| β2T | <1.3 (1) (where β2T <0) 0.3 <D2 / fw <0 ........................ (2) 0.6 <| 1 / fa1 + 1 / fa2 | .fw <0.9 .................. (3) (however fa1 <0, fa2 <0) 0.07 <D21 / fw <0.15 ... (4) 18 <ν11−ν10 <32 (5) It is preferable to satisfy the following condition.
【００２５】条件式（１）は望遠側のときの、即ち低倍
側のときの第２群の結像倍率に関し、第１群と第２群の
変倍に伴う移動軌跡を特定し、変倍に伴う収差変動量を
少なくし、かつ瞳の移動量を少なくする為のものであ
る。上限値を越えると変倍に伴う第１群の移動量が増加
し、レンズ全長が長くなってくるので良くない。又下限
値を越えると第２群の移動量が増加し、変倍に伴う諸収
差の変動量が多くなってくるので良くない。Conditional expression (1) relates to the image-forming magnification of the second lens unit on the telephoto side, that is, on the low-power side, and specifies the movement loci of the first lens unit and the second lens unit during zooming, This is for reducing the amount of aberration variation due to doubling and for reducing the amount of movement of the pupil. If the value exceeds the upper limit, the amount of movement of the first lens unit due to zooming increases, and the overall lens length becomes longer, which is not preferable. On the other hand, if the value goes below the lower limit, the amount of movement of the second lens unit increases, and the amount of variation of various aberrations due to zooming increases, which is not preferable.
【００２６】条件式（２）は第１レンズと第２レンズと
の空気間隔を適切に保ち、主にコマ収差を良好に補正す
る為のものである。条件式（２）を外れると変倍に伴な
いコマ収差の変動が大きくなってくるので良くない。Conditional expression (2) is for maintaining an appropriate air gap between the first lens and the second lens, and mainly for favorably correcting coma aberration. If the conditional expression (2) is not satisfied, the fluctuation of the coma aberration will increase with zooming, which is not preferable.
【００２７】条件式（３）は一定のバックフォーカスを
確保しつつ、主に非点隔差とコマ収差をバランス良く補
正する為のものである。下限値を越えるとバックフォー
カスが短くなりすぎ機構的に支障が生じてくる。又上限
値を越えると変倍に伴ない非点隔差とコマ収差の変動が
大きくなってくるので良くない。Conditional expression (3) is mainly for correcting a well-balanced astigmatic difference and coma while ensuring a constant back focus. If the value goes below the lower limit, the back focus becomes too short, which causes mechanical problems. On the other hand, if the value exceeds the upper limit, fluctuations in astigmatism and coma will increase due to zooming, which is not preferable.
【００２８】条件式（４）は主に一定のバックフォーカ
スを確保しつつ、コマ収差を良好に補正する為のもので
ある。上限値を越えると一定のバックフォーカスを確保
するのが難しくなってくる。又下限値を越えると外向性
コマ収差の発生が増大してくるので良くない。Conditional expression (4) is mainly for correcting coma aberration favorably while ensuring a constant back focus. Beyond the upper limit, it becomes difficult to secure a certain back focus. On the other hand, when the value goes below the lower limit, the occurrence of outward coma increases, which is not good.
【００２９】条件式（５）は主に色のコマ収差を良好に
補正する為のものである。上限値を越えると色のコマ収
差が補正過剰となり、又下限値を越えると逆に補正不足
となってくる。Conditional expression (5) is mainly for satisfactorily correcting chromatic coma. When the value exceeds the upper limit, the coma aberration of the color is overcorrected, and when the value exceeds the lower limit, the correction is insufficient.
【００３０】次に本発明のズームレンズをマイクロフィ
ルムリーダープリンターに適用した場合の光学配置の一
実施例について説明する。Next, an embodiment of the optical arrangement when the zoom lens of the present invention is applied to a microfilm reader printer will be described.
【００３１】図７は本発明のズームレンズをマイクロフ
ィルムリーダープリンターに適用したときの要部概略図
である。FIG. 7 is a schematic view of a main part when the zoom lens of the present invention is applied to a microfilm reader printer.
【００３２】図７において２は本発明のズームレンズで
あり、フィルム画像１を後述する各要素を介してスクリ
ーン８面（有効画面３００×３００ｍｍ）上又は感光ド
ラム１２面上に選択的に拡大投影している。In FIG. 7, reference numeral 2 denotes a zoom lens according to the present invention, and the film image 1 is selectively enlarged and projected on the screen 8 surface (effective screen 300 × 300 mm) or the photosensitive drum 12 surface through each element described later. is doing.
【００３３】３は像回転プリズムであり、ズームレンズ
２の拡大側射出口近傍に矢印３ａで示すように回動可能
に配置されており、投影像を所定角度回転させて射出し
ている。４は走査用ミラーであり、矢印４ａの如く振動
し後述するように感光ドラム面上に投影像を走査し形成
している。又走査用ミラー４は像回転プリズム３からの
光束をスクリーン面８又は感光ドラム面１２に選択して
導光する切換機能も合わせて有している。５，６，７は
各々リーダ用のミラーであり、走査用ミラー４からの光
束を反射させスクリーン８面上に導光している。９，１
０，１１は各々プリンター用のミラーであり、走査用ミ
ラー４からの光束を反射させて感光ドラム１２面上に導
光している。An image rotating prism 3 is rotatably arranged in the vicinity of the enlargement-side exit of the zoom lens 2 as shown by an arrow 3a, and the projected image is rotated by a predetermined angle and emitted. A scanning mirror 4 vibrates as indicated by an arrow 4a and scans and forms a projected image on the surface of the photosensitive drum as described later. The scanning mirror 4 also has a switching function of selecting and guiding the light beam from the image rotating prism 3 to the screen surface 8 or the photosensitive drum surface 12. Reference numerals 5, 6, and 7 are reader mirrors, which reflect the light flux from the scanning mirror 4 and guide it onto the screen 8 surface. 9, 1
Reference numerals 0 and 11 denote printer mirrors, which reflect the light flux from the scanning mirror 4 and guide the light flux onto the surface of the photosensitive drum 12.
【００３４】図７においてスクリーン８面上で投影像を
観察するリーダのときはズームレンズ２からの光束を像
回転プリズム３を介し、走査ミラー４でミラー５の方向
に反射させ、その後ミラー６，７を介してスクリーン８
面上に拡大した投影像を形成している。In the case of a reader for observing a projected image on the screen 8 in FIG. 7, the light flux from the zoom lens 2 is reflected by the scanning mirror 4 toward the mirror 5 via the image rotation prism 3, and then the mirror 6 ,. Screen 8 through 7
An enlarged projection image is formed on the surface.
【００３５】次に感光ドラム１２面上に投影像を形成す
るプリンターのときはズームレンズ２からの光束を像回
転プリズム３を介して射出させ走査ミラー４の傾きを変
えてミラー９の方向に反射させ、その後ミラー１０，１
１で反射させ感光ドラム１２面上に拡大した投影像を形
成している。このとき走査ミラー４を矢印４ａの方向に
振動させて感光ドラム１２面上を副走査方向に走査し、
これによりフィルム画像１全体の画像情報を感光ドラム
１２面上に記録している。Next, in the case of a printer which forms a projected image on the surface of the photosensitive drum 12, the light flux from the zoom lens 2 is emitted through the image rotation prism 3 and the inclination of the scanning mirror 4 is changed and reflected in the direction of the mirror 9. And then the mirror 10,1
The reflected image is reflected at 1 to form a magnified projected image on the surface of the photosensitive drum 12. At this time, the scanning mirror 4 is vibrated in the direction of arrow 4a to scan the surface of the photosensitive drum 12 in the sub-scanning direction,
As a result, the image information of the entire film image 1 is recorded on the surface of the photosensitive drum 12.
【００３６】本実施例では以上のように各要素を構成す
ることによりリーダ時及びプリンター時における装置全
体の小型化を容易に達成している。In this embodiment, by constructing each element as described above, the miniaturization of the entire apparatus at the time of the reader and the printer can be easily achieved.
【００３７】又、本実施例では像回転プリズム３をズー
ムレンズ２の一部に一体化し、像回転プリズムとズーム
レンズの変倍とを連動させることにより像回転プリズム
の小型化を達成している。Further, in this embodiment, the image rotating prism 3 is integrated with a part of the zoom lens 2 and the image rotating prism and the zoom lens are scaled in association with each other, thereby achieving downsizing of the image rotating prism. .
【００３８】この他本実施例では第２群の拡大側に絞り
を配置し、拡大側から見たときの瞳位置を像回転プリズ
ム側に近付け、これにより像回転プリズムの小型化を図
っている。In addition to this, in the present embodiment, a diaphragm is arranged on the magnifying side of the second lens group, and the pupil position when viewed from the magnifying side is brought closer to the image rotating prism side, whereby the image rotating prism is miniaturized. .
【００３９】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。但し、Ｒ２
４，Ｒ２５は押え板ガラスである。Next, numerical examples of the present invention will be shown. In the numerical examples, Ri is the radius of curvature of the i-th lens surface in order from the object side, Di is the i-th lens thickness and air gap from the object side, and Ni and νi are respectively from the object side in the i-th lens. The refractive index of glass and the Abbe number. However, R2
4, R25 is a pressing plate glass.
【００４０】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。
数値実施例 １
F=16.54〜29.97 FNO=1:2.55〜4.67 倍率 -1/55〜1/30
R 1= 31.38 D 1= 1.00 N 1=1.77250 ν 1= 49.6
R 2= 14.73 D 2= 7.31
R 3= -28.80 D 3= 1.00 N 2=1.77250 ν 2= 49.6
R 4= 237.56 D 4= 0.50
R 5= 42.32 D 5= 2.20 N 3=1.80518 ν 3= 25.4
R 6=-159.83 D 6= 可変
R 7=∞（絞り） D 7= 1.00
R 8= 100.62 D 8= 3.20 N 4=1.80610 ν 4= 40.9
R 9= -27.74 D 9= 0.55
R10= 18.60 D10= 1.00 N 5=1.84666 ν 5= 23.9
R11=-104.91 D11= 0.20
R12= 26.73 D12= 3.70 N 6=1.60729 ν 6= 49.2
R13= -30.51 D13= 0.20
R14= 11.28 D14= 3.50 N 7=1.51633 ν 7= 64.1
R15= 26.79 D15= 1.91
R16= 45.63 D16= 1.20 N 8=1.74950 ν 8= 35.3
R17= 9.18 D17= 1.05
R18= 18.40 D18= 3.50 N 9=1.72825 ν 9= 28.5
R19= -21.69 D19= 0.41
R20= -14.87 D20= 1.20 N10=1.68893 ν10= 31.1
R21= 13.20 D21= 1.88
R22= 16.65 D22= 3.4 N11=1.60729 ν11= 59.4
R23= -47.00 D23= 可変
R24= ∞ D24= 3.00 N12=1.51633 ν12= 64.1
R25= ∞ Table 1 shows the relationship between the above-mentioned conditional expressions and various numerical values in the numerical examples. Numerical Example 1 F = 16.54 to 29.97 FNO = 1: 2.55 to 4.67 Magnification -1/55 to 1/30 R 1 = 31.38 D 1 = 1.00 N 1 = 1.77250 ν 1 = 49.6 R 2 = 14.73 D 2 = 7.31 R 3 = -28.80 D 3 = 1.00 N 2 = 1.77250 ν 2 = 49.6 R 4 = 237.56 D 4 = 0.50 R 5 = 42.32 D 5 = 2.20 N 3 = 1.80518 ν 3 = 25.4 R 6 = -159.83 D 6 = Variable R 7 = ∞ (aperture) D 7 = 1.00 R 8 = 100.62 D 8 = 3.20 N 4 = 1.80610 ν 4 = 40.9 R 9 = -27.74 D 9 = 0.55 R10 = 18.60 D10 = 1.00 N 5 = 1.84666 ν 5 = 23.9 R11 = -104.91 D11 = 0.20 R12 = 26.73 D12 = 3.70 N 6 = 1.60729 ν 6 = 49.2 R13 = -30.51 D13 = 0.20 R14 = 11.28 D14 = 3.50 N 7 = 1.51633 ν 7 = 64.1 R15 = 26.79 D15 = 1.91 R16 = 45.63 D16 = 1.20 N 8 = 1.74950 ν 8 = 35.3 R17 = 9.18 D17 = 1.05 R18 = 18.40 D18 = 3.50 N 9 = 1.72825 ν 9 = 28.5 R19 = -21.69 D19 = 0.41 R20 = -14.87 D20 = 1.20 N10 = 1.68893 ν10 = 31.1 R21 = 13.20 D21 = 1.88 R22 = 16.65 D22 = 3.4 N11 = 1.60729 ν11 = 59.4 R23 = -47.00 D23 = Variable R24 = ∞ D24 = 3.00 N12 = 1.51633 ν12 = 64.1 R25 = ∞
【００４１】[0041]
【表１】 物像間距離 978.38 バックフォーカス長 12.64 数値実施例 ２ F=16.56〜29.99 FNO=1:2.55〜4.67 倍率 -1/55〜1/30 R 1= 32.13 D 1= 1.00 N 1=1.77250 ν 1= 49.6 R 2= 13.21 D 2= 7.39 R 3= -39.33 D 3= 1.00 N 2=1.69680 ν 2= 55.5 R 4= 68.72 D 4= 0.50 R 5= 28.83 D 5= 2.20 N 3=1.84666 ν 3= 23.9 R 6= 135.62 D 6= 可変 R 7=∞（絞り） D 7= 0.50 R 8= 57.96 D 8= 4.30 N 4=1.77250 ν 4= 49.6 R 9= -26.36 D 9= 0.67 R10= -17.87 D10= 1.00 N 5=1.80518 ν 5= 25.4 R11= -95.00 D11= 0.20 R12= 32.65 D12= 4.00 N 6=1.61720 ν 6= 54.0 R13= -30.59 D13= 0.20 R14= 15.56 D14= 3.80 N 7=1.51633 ν 7= 64.1 R15= 28.49 D15= 2.73 R16= 30.92 D16= 1.20 N 8=1.74950 ν 8= 35.3 R17= 11.63 D17= 0.98 R18= 22.25 D18= 3.30 N 9=1.72825 ν 9= 28.5 R19= -24.33 D19= 0.65 R20= -15.63 D20= 1.20 N10=1.68893 ν10= 31.1 R21= 12.95 D21= 2.31 R22= 16.63 D22= 3.4 N11=1.53996 ν11= 59.4 R23= -32.49 D23= 可変 R24= ∞ D24= 3.00 N12=1.51633 ν12= 64.1 R25= ∞ [Table 1] Object-to-image distance 978.38 Back focus length 12.64 Numerical example 2 F = 16.56 to 29.99 FNO = 1: 2.55 to 4.67 Magnification -1/55 to 1/30 R 1 = 32.13 D 1 = 1.00 N 1 = 1.77250 ν 1 = 49.6 R 2 = 13.21 D 2 = 7.39 R 3 = -39.33 D 3 = 1.00 N 2 = 1.69680 ν 2 = 55.5 R 4 = 68.72 D 4 = 0.50 R 5 = 28.83 D 5 = 2.20 N 3 = 1.84666 ν 3 = 23.9 R 6 = 135.62 D 6 = Variable R 7 = ∞ (aperture) D 7 = 0.50 R 8 = 57.96 D 8 = 4.30 N 4 = 1. 77250 ν 4 = 49.6 R 9 = -26.36 D 9 = 0.67 R10 = -17.87 D10 = 1.00 N 5 = 1.80518 ν 5 = 25.4 R11 = -95.00 D11 = 0.20 R12 = 32.65 D12 = 4.00 N 6 = 1.61720 ν 6 = 54.0 R13 = -30.59 D13 = 0.20 R14 = 15.56 D14 = 3.80 N 7 = 1.51633 ν 7 = 64.1 R15 = 28.49 D15 = 2.73 R16 = 30.92 D16 = 1.20 N 8 = 1.74950 ν 8 = 35.3 R17 = 11.63 D17 = 0.98 R18 = 22.25 D18 = 3.30 N 9 = 1.72825 ν 9 = 28.5 R19 = -24.33 D19 = 0.65 R20 =- 15.63 D20 = 1.20 N10 = 1.68893 ν10 = 31.1 R21 = 12.95 D21 = 2.31 R22 = 16.63 D22 = 3.4 N11 = 1.53996 ν11 = 59.4 R23 = -32.49 D23 = Variable R24 = ∞ D24 = 3.00 N12 = 1.51633 ν12 = 64.1 R25 = ∞
【００４２】[0042]
【表２】 物像間距離 978.38 バックフォーカス長 12.77 数値実施例 ３ F=16.54〜29.97 FNO=1:2.55〜4.67 倍率 -1/55〜1/30 R 1= 36.90 D 1= 1.00 N 1=1.77250 ν 1= 49.6 R 2= 13.69 D 2= 5.99 R 3= -35.29 D 3= 1.00 N 2=1.69700 ν 2= 48.5 R 4= 155.19 D 4= 0.50 R 5= 31.01 D 5= 2.20 N 3=1.80518 ν 3= 25.4 R 6=1555.81 D 6= 可変 R 7=∞（絞り） D 7= 0.50 R 8= 77.31 D 8= 4.30 N 4=1.77250 ν 4= 49.6 R 9= -26.44 D 9= 0.64 R10= -17.92 D10= 1.00 N 5=1.80518 ν 5= 25.4 R11= -93.63 D11= 0.20 R12= 30.97 D12= 4.00 N 6=1.61720 ν 6= 54.0 R13= -30.94 D13= 0.20 R14= 12.48 D14= 3.80 N 7=1.51633 ν 7= 64.1 R15= 18.62 D15= 1.78 R16= 28.77 D16= 1.20 N 8=1.74950 ν 8= 35.3 R17= 10.97 D17= 1.00 R18= 20.37 D18= 3.30 N 9=1.72825 ν 9= 28.5 R19= -24.41 D19= 0.66 R20= -16.28 D20= 1.20 N10=1.68893 ν10= 31.1 R21= 11.25 D21= 1.44 R22= 14.31 D22= 3.4 N11=1.57135 ν11= 53.0 R23= -43.68 D23= 可変 R24= ∞ D24= 3.00 N12=1.51633 ν12= 64.1 R25= ∞ [Table 2] Object-to-image distance 978.38 Back focus length 12.77 Numerical example 3 F = 16.54 to 29.97 FNO = 1: 2.55 to 4.67 Magnification -1/55 to 1/30 R 1 = 36.90 D 1 = 1.00 N 1 = 1.77250 ν 1 = 49.6 R 2 = 13.69 D 2 = 5.99 R 3 = -35.29 D 3 = 1.00 N 2 = 1.69700 ν 2 = 48.5 R 4 = 155.19 D 4 = 0.50 R 5 = 31.01 D 5 = 2.20 N 3 = 1.80518 ν 3 = 25.4 R 6 = 1555.81 D 6 = Variable R 7 = ∞ (Aperture) D 7 = 0.50 R 8 = 77.31 D 8 = 4.30 N 4 = 1.77250 ν 4 = 49.6 R 9 = -26.44 D 9 = 0.64 R10 = -17.92 D10 = 1.00 N 5 = 1.80518 ν 5 = 25.4 R11 = -93.63 D11 = 0.20 R12 = 30.97 D12 = 4.00 N 6 = 1.61720 ν 6 = 54.0 R13 = -30.94 D13 = 0.20 R14 = 12.48 D14 = 3.80 N 7 = 1.51633 ν 7 = 64.1 R15 = 18.62 D15 = 1.78 R16 = 28.77 D16 = 1.20 N 8 = 1.74950 ν 8 = 35.3 R17 = 10.97 D17 = 1.00 R18 = 20.37 D18 = 3.30 N 9 = 1.72825 ν 9 = 28.5 R19 = -24.41 D19 = 0.66 R20 =- 16.28 D20 = 1.20 N10 = 1.68893 ν10 = 31.1 R21 = 11.25 D21 = 1.44 R22 = 14.31 D22 = 3.4 N11 = 1.57135 ν11 = 53.0 R23 = -43.68 D23 = Variable R24 = ∞ D24 = 3.00 N12 = 1.51633 ν12 = 64.1 R25 = ∞
【００４３】[0043]
【表３】 物像間距離 978.38 バックフォーカス長 12.79[Table 3] Object-to-image distance 978.38 Back focus length 12.79
【００４４】[0044]
【表４】 （表−１） [Table 4] (Table-1)
【００４５】[0045]
【発明の効果】本発明によれば前述の如く各レンズを構
成することによりマイクロフィルムリーダーやプリンタ
ー等に好適な良好なる光学性能を有した５５倍程度の投
影倍率までカバーしたズーム比１．８倍程度の投影用の
ズームレンズを達成することができる。According to the present invention, by constructing each lens as described above, a zoom ratio of 1.8 which covers up to a projection magnification of about 55 times, which has good optical performance suitable for a microfilm reader, a printer and the like, is provided. A zoom lens for projection of about twice can be achieved.
【図１】 本発明の数値実施例１のレンズ断面図FIG. 1 is a lens cross-sectional view of Numerical Example 1 of the present invention.
【図２】 本発明の数値実施例２のレンズ断面図FIG. 2 is a lens cross-sectional view of Numerical Example 2 of the present invention.
【図３】 本発明の数値実施例３のレンズ断面図FIG. 3 is a lens cross-sectional view of Numerical Example 3 of the present invention.
【図４】 本発明の数値実施例１の諸収差図FIG. 4 is a diagram showing various aberrations of Numerical Example 1 of the present invention.
【図５】 本発明の数値実施例２の諸収差図FIG. 5 is a diagram of various types of aberration in Numerical example 2 of the present invention.
【図６】 本発明の数値実施例３の諸収差図FIG. 6 is a diagram showing various types of aberration in Numerical Example 3 of the present invention.
【図７】 本発明のズームレンズをマイクロフィルムリ
ーダープリンターに適用したときの概略図FIG. 7 is a schematic diagram when the zoom lens of the present invention is applied to a microfilm reader printer.
Ｌ１ 第１群 Ｌ２ 第２群 １ フィルム画像 ２ ズームレンズ ３ 像回転プリズム ４ 走査ミラー ５，６，７，９，１０，１１ ミラー ８ スクリーン １２ 感光ドラム Ｓ サジタル像面 Ｍ メリディオナル像面 ｄ ｄ線 ｇ ｇ線 L1 first group L2 second group 1 film image 2 zoom lens 3 Image rotation prism 4 scanning mirror 5,6,7,9,10,11 Mirror 8 screen 12 Photosensitive drum S sagittal image plane M meridional image plane d d line g g line
Claims (2)
の屈折力の第２群の２つのレンズ群を有し、両レンズ群
の間隔を変化させて変倍を行うズームレンズにおいて、
該第１群は拡大側に凸面を向けたメニスカス状の負の第
１レンズ、両レンズ面が凹面の負の第２レンズ、拡大側
に凸面を向けた正の第３レンズを有し、該第２群は絞
り、拡大側に比べ縮小側に強い屈折面を向けた両レンズ
面が凸面の第４レンズ、縮小側に凸面を向けたメニスカ
ス状の負の第５レンズ、両レンズ面が凸面の第６レン
ズ、拡大側に凸面を向けたメニスカス状の正の第７レン
ズ、拡大側に凸面を向けたメニスカス状の負の第８レン
ズ、両レンズ面が凸面の第９レンズ、両レンズ面が凹面
の第１０レンズ、そして縮小側に比べて拡大側に強い屈
折面を向けた両レンズ面が凸面の第１１レンズを有して
いることを特徴とするズームレンズ。1. A zoom lens having two lens groups, a first lens group having a negative refractive power and a second lens group having a positive refractive power, in order from the enlargement side, and varying the distance between both lens groups to perform zooming. At
The first group includes a meniscus-shaped negative first lens having a convex surface directed toward the magnification side, a negative second lens having concave surfaces on both lens surfaces, and a positive third lens having a convex surface directed toward the magnification side, The second lens group is a stop, and the fourth lens has a convex surface on both sides of the refracting surface that is stronger than the expansion side and has a convex surface on both sides. The fifth lens is a negative meniscus lens having a convex surface on the reduction side. No. 6 lens, a meniscus-shaped positive seventh lens with a convex surface facing the magnifying side, a meniscus-shaped negative eighth lens with a convex surface facing the magnifying side, a ninth lens with both convex lens surfaces, both lens surfaces Is a concave tenth lens, and a zoom lens characterized in that it has an eleventh lens with both lens surfaces having a strong refracting surface facing the enlargement side as compared with the reduction side.
はレンズ厚をＤｉ、第ｉレンズの材質のアッベ数をν
ｉ、前記第８レンズと第９レンズとから形成される空気
レンズの焦点距離をｆａ１、前記第９レンズと第１０レ
ンズとから形成される空気レンズの焦点距離をｆａ２、
望遠側における前記第２群の結像倍率をβ２Ｔ、広角端
における全系の焦点距離をｆｗとしたとき、 ０．８５＜｜β２Ｔ｜＜１．３（但し β２Ｔ＜０） ０．３ ＜Ｄ２／ｆｗ＜０．５ ０．６＜｜１／ｆａ１＋１／ｆａ２｜・ｆｗ＜０．９ （但し ｆａ１＜０ ， ｆａ２＜０） ０．０７＜Ｄ２１／ｆｗ＜０．１５ １８＜ν１１−ν１０＜３２ なる条件を満足することを特徴とする請求項１のズーム
レンズ。2. The i-th air space or lens thickness counted from the magnifying side is Di, and the Abbe number of the material of the i-th lens is v
i, the focal length of the air lens formed by the eighth lens and the ninth lens is fa1, the focal length of the air lens formed by the ninth lens and the tenth lens is fa2,
When the image forming magnification of the second lens unit on the telephoto side is β2T and the focal length of the entire system at the wide-angle end is fw, 0.85 <| β2T | <1.3 (where β2T <0) 0.3 <D2 /Fw<0.5 0.6 <| 1 / fa1 + 1 / fa2 | .fw <0.9 (however, fa1 <0, fa2 <0) 0.07 <D21 / fw <0.15 18 <ν11-ν10 < The zoom lens according to claim 1, wherein the condition 32 is satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3185336A JP3042049B2 (en) | 1991-06-28 | 1991-06-28 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3185336A JP3042049B2 (en) | 1991-06-28 | 1991-06-28 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0511183A true JPH0511183A (en) | 1993-01-19 |
| JP3042049B2 JP3042049B2 (en) | 2000-05-15 |
Family
ID=16169022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3185336A Expired - Fee Related JP3042049B2 (en) | 1991-06-28 | 1991-06-28 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3042049B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998049059A1 (en) | 1997-04-30 | 1998-11-05 | Mitsubishi Heavy Industries, Ltd. | Apparatus for conveying, supplying, and filling unshaped containers, and method for conveying and supplying the same |
| US5971566A (en) * | 1996-07-23 | 1999-10-26 | Matsushita Electric Industrial Co., Ltd. | Plasma display device and its manufacturing method |
| JP2001051195A (en) * | 1999-07-28 | 2001-02-23 | Nitto Kogaku Kk | Zoom lens for projection and projector |
| US6275220B1 (en) | 1997-03-17 | 2001-08-14 | Nec Corporation | Flat panel type display apparatuses having driver ICs formed on plate for holding display glasses |
| US6494429B2 (en) | 1997-08-04 | 2002-12-17 | Canon Kabushiki Kaisha | Panel support structure, display panel supported by panel support structure, and image forming apparatus using display panel |
| US6677664B2 (en) | 2000-04-25 | 2004-01-13 | Fujitsu Hitachi Plasma Display Limited | Display driver integrated circuit and flexible wiring board using a flat panel display metal chassis |
-
1991
- 1991-06-28 JP JP3185336A patent/JP3042049B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5971566A (en) * | 1996-07-23 | 1999-10-26 | Matsushita Electric Industrial Co., Ltd. | Plasma display device and its manufacturing method |
| CN1299314C (en) * | 1996-07-23 | 2007-02-07 | 松下电器产业株式会社 | Plasma display device |
| US6275220B1 (en) | 1997-03-17 | 2001-08-14 | Nec Corporation | Flat panel type display apparatuses having driver ICs formed on plate for holding display glasses |
| WO1998049059A1 (en) | 1997-04-30 | 1998-11-05 | Mitsubishi Heavy Industries, Ltd. | Apparatus for conveying, supplying, and filling unshaped containers, and method for conveying and supplying the same |
| US6338371B1 (en) | 1997-04-30 | 2002-01-15 | Mitsubishi Heavy Industries, Ltd. | Apparatus for conveying, supplying, and filling unshaped containers, and method for conveying and supplying the same |
| US6494429B2 (en) | 1997-08-04 | 2002-12-17 | Canon Kabushiki Kaisha | Panel support structure, display panel supported by panel support structure, and image forming apparatus using display panel |
| JP2001051195A (en) * | 1999-07-28 | 2001-02-23 | Nitto Kogaku Kk | Zoom lens for projection and projector |
| US6677664B2 (en) | 2000-04-25 | 2004-01-13 | Fujitsu Hitachi Plasma Display Limited | Display driver integrated circuit and flexible wiring board using a flat panel display metal chassis |
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| Publication number | Publication date |
|---|---|
| JP3042049B2 (en) | 2000-05-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |