JPH077153B2 - Flare shading device for variable power optics - Google Patents
Flare shading device for variable power opticsInfo
- Publication number
- JPH077153B2 JPH077153B2 JP58107966A JP10796683A JPH077153B2 JP H077153 B2 JPH077153 B2 JP H077153B2 JP 58107966 A JP58107966 A JP 58107966A JP 10796683 A JP10796683 A JP 10796683A JP H077153 B2 JPH077153 B2 JP H077153B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- shielding plate
- lens
- main lens
- magnification
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/041—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with variable magnification
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Variable Magnification In Projection-Type Copying Machines (AREA)
Description
【発明の詳細な説明】 技術分野 この発明は、主レンズを光路軸に沿つて所定範囲移動さ
せ該主レンズのみで又はこれと付加レンズとを組合せて
結像面に変倍投影を行なうことのできる光学系のフレア
遮光装置に関する。Description: TECHNICAL FIELD The present invention relates to performing variable-magnification projection on an image plane by moving a main lens within a predetermined range along an optical path axis, or by using the main lens alone or in combination with the additional lens. The present invention relates to a flare shading device for an optical system.
従来技術 変倍複写機等における、結像面への投影倍率の変更は結
像レンズを光路軸に沿つて移動させて行なわれる。この
場合原稿面から結像面迄の光路長、すなわち共役長も変
化するので原稿固定ミラー移動走査型の光学系では一般
に一部のミラーも移動させることにより共役長を変える
ようにしている。しかし原稿移動型の場合はミラー走査
は行なわないので、変倍時にも共役長が変らないように
することが好都合である。その場合は、付加レンズを主
レンズと光軸が一致するように光路に挿入し、合成焦点
距離を変えるようにすればよい。2. Description of the Related Art In a variable power copying machine or the like, the projection magnification on the image plane is changed by moving the image forming lens along the optical path axis. In this case, since the optical path length from the document surface to the image plane, that is, the conjugate length also changes, the conjugate length is generally changed by moving some mirrors in the original fixed mirror moving scanning type optical system. However, in the case of the original moving type, since the mirror scanning is not performed, it is convenient not to change the conjugate length even when the magnification is changed. In that case, the additional lens may be inserted in the optical path so that the optical axis of the additional lens may coincide with that of the main lens, and the combined focal length may be changed.
変倍時付加レンズを光路に挿入する手段としては、従来
は主レンズと付加レンズとを同一のキヤリツジに取付
け、キヤリツジを変倍のために移動させた場合、カム等
により付加レンズを所定の位置にもとらすようにしてい
た。したがつてレンズを含むキヤリツジの質量が大きく
なり、移動用動力が増加し、又付加レンズの取付個数が
限定され、多段変倍には適さない欠点があつた。Conventionally, as a means for inserting the additional lens into the optical path during zooming, when the main lens and the additional lens are mounted on the same carriage and the carriage is moved for zooming, the additional lens is moved to a predetermined position by a cam or the like. I was trying to catch it. Therefore, the carriage including the lens has a large mass, power for movement increases, and the number of additional lenses to be attached is limited, which is not suitable for multi-stage variable magnification.
そこで付加レンズを主レンズのキヤリツジに取付けない
で、複数の付加レンズを夫々別個のキヤリツジに取付け
て光路軸と直角方向に移動させて光路に出入れ可能と
し、所望の倍率に変倍する場合主レンズを所定の位置に
移動させるとともに、その倍率に対応する付加レンズを
主レンズと光軸が一致する如く光路内に挿入し、あるい
は光路外に退避させるようにした光学系が提案されてい
る。Therefore, instead of attaching additional lenses to the carriage of the main lens, multiple additional lenses can be attached to separate carriages and moved in the direction perpendicular to the optical path axis to move in and out of the optical path. There has been proposed an optical system in which a lens is moved to a predetermined position, and an additional lens corresponding to the magnification is inserted into the optical path such that the optical axis coincides with the main lens or retracted outside the optical path.
その場合は、従来の如くレンズと一体に照射幅の全幅に
わたる遮光板を移動させようとすると遮光板が付加レン
ズに防げられて移動させることができなくなる。In that case, if it is attempted to move the shading plate over the entire irradiation width integrally with the lens as in the conventional case, the shading plate is prevented by the additional lens and cannot be moved.
又、主レンズだけを移動して変倍を行なう場合であつて
も、レンズと一体に全幅にわたる遮光板を移動させるこ
とは移動質量が大きくなるので、遮光板は可能な限り機
枠に固設することが望ましい。Even when only the main lens is moved to change the magnification, moving the light-shielding plate over the entire width integrally with the lens increases the moving mass, so the light-shielding plate should be fixed to the machine frame as much as possible. It is desirable to do.
しかし、各変倍時の光束を遮ることがなく、かつ主レン
ズが通過可能な最小限の開口を遮光板に設けたとして
も、原稿面からの反射光でレンズの外側を通過した光線
が結像面に達し、フレアが出ることが避けられない。フ
レアを発生させる光線を遮るために固定遮光板と遮光範
囲がオーバーラツプするようにレンズに直角にその両側
に板金等の剛性のある部材で遮光板を設けた場合は、レ
ンズが固定遮光板と干渉して遮光板の開口を通過するこ
とができなくなる。そのため遮光板をカム等でその面内
を移動可能として開口の開度を可変にしたフレア遮光装
置が提案されているが、構成が複雑になる難点がある。However, even if the light-shielding plate has a minimum aperture that does not block the light flux at each magnification change and allows the main lens to pass through, the light rays that have passed through the outside of the lens are combined by the reflected light from the document surface. It is unavoidable that the image surface is reached and flare appears. When a light shield plate is provided at right angles to the lens by a rigid member such as a metal plate so that the light shield range overlaps with the fixed light shield plate to block the light rays that cause flare, the lens interferes with the fixed light shield plate. Then, it becomes impossible to pass through the opening of the light shielding plate. Therefore, a flare shading device has been proposed in which the shading plate can be moved in its plane by a cam or the like and the opening degree of the opening is variable, but there is a drawback that the configuration becomes complicated.
目的 本発明は、主レンズを光路軸に沿つて移動させ変倍投影
を可能とした光学系で遮光板を機枠に固設した場合の従
来のフレア遮光装置の上述の欠点を解消した、簡単な構
成でフレア光を確実に遮光することのできレンズを所定
の位置に移動させることのできる装置を提供することを
目的とする。An object of the present invention is to solve the above-mentioned drawbacks of the conventional flare shading device in the case where the shading plate is fixedly mounted on the machine frame with an optical system capable of variable magnification projection by moving the main lens along the optical path axis. It is an object of the present invention to provide a device capable of reliably blocking flare light and moving a lens to a predetermined position with such a configuration.
構成 以下、本発明を図面に示す実施例にもとづいて詳細に説
明する。Configuration Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
第１図は、主レンズ６が光軸方向に所定範囲移動し、各
変倍に対して付加レンズ7,8,9,10のいずれか所定の１個
が主レンズと光軸が一致する如く光路の出入可能となつ
ている共役長不変の変倍複写機に本発明を適用した実施
例である。FIG. 1 shows that the main lens 6 moves in the optical axis direction within a predetermined range, and that one of the additional lenses 7, 8, 9, and 10 has a corresponding optical axis to the main lens for each magnification change. This is an embodiment in which the present invention is applied to a variable-magnification copying machine in which the optical path can be moved in and out and the conjugate length is invariable.
原稿ガイドガラス１上を移動する原稿は図示せず高原に
より照射され、その反射光は固定された第１ミラー２、
第２ミラー３で反射し、主レンズ６と光軸上にもとらさ
れたいずれか１つの付加レンズにより集束し、固定され
た第３ミラー４、第４ミラー５で反射して感光体12上に
結像するようになつている。The original moving on the original guide glass 1 is illuminated by a plateau (not shown), and its reflected light is fixed to the first mirror 2,
The light is reflected by the second mirror 3, focused by the main lens 6 and any one of the additional lenses taken along the optical axis, reflected by the fixed third mirror 4 and the fourth mirror 5, and reflected on the photoconductor 12. To form an image.
この実施例の変倍複写機は1.41倍の拡大複写と、等倍
と、0.707倍及び0.5倍の縮小複写が可能となつており、
その夫々の場合に主レンズ６を光軸に沿つて所定の位置
に移動させるとともに上記の各倍率に対応して付加レン
ズ7,8,9,10のうちの１つを主レンズ６と光軸を一致させ
て光路にもたらし位置決めする。第１図には1.41倍の拡
大複写の場合の主レンズ６及び付加レンズ７の位置を実
線で示す。他の付加レンズ8,9,10は光路を遮らない位置
に退避している。The variable-magnification copying machine of this embodiment is capable of 1.41 times enlargement copying, 1: 1 magnification, 0.707 times and 0.5 times reduction copying,
In each case, the main lens 6 is moved to a predetermined position along the optical axis, and one of the additional lenses 7, 8, 9, and 10 is attached to the main lens 6 and the optical axis corresponding to each of the above magnifications. Are aligned and brought into the optical path for positioning. In FIG. 1, the positions of the main lens 6 and the additional lens 7 in the case of 1.41 magnified copying are shown by solid lines. The other additional lenses 8, 9 and 10 are retracted to the position where they do not block the optical path.
第２図は、光源により照射された原稿面からの反射光が
レンズを通らずに感光体12の表面に入射するフレアを説
明するための平面図である。FIG. 2 is a plan view for explaining flare in which the reflected light from the document surface illuminated by the light source enters the surface of the photoconductor 12 without passing through the lens.
各倍率時に感光体上に結像する光束の最外側の光線の包
絡線のウエスト部（図の場合付加レンズ７と８との間）
に遮光板11が側板14に固定して設けられ、この固定遮光
板11には、いずれの倍率時にも原稿から感光体12上の作
像範囲迄の光路を遮光しないような開口が設けられてい
る。第２図中のa,bは開口の両端を示す。倍率が1.41倍
の時は、レンズ７のレンズセルの外周ｄ点より外側を通
る光線により上記のａ点と上記のｄ点とを通る直線の延
長線と感光体面12との交点Ａから、光軸に関して反対側
の作像範囲の端Ｃ点の方向でフレアが出る。同様に付加
レンズ７のレンズセルの外周の反対側の点ｅの外側を通
る光線により、直線ebの延長線と感光体12の面の交点
Ａ′からＣ′の方向でフレアが出る。Waist part of the envelope of the outermost rays of the light flux that forms an image on the photoconductor at each magnification (between the additional lenses 7 and 8 in the figure)
A light blocking plate 11 is fixedly provided on the side plate 14, and the fixed light blocking plate 11 is provided with an opening that does not block the optical path from the document to the image forming range on the photoconductor 12 at any magnification. There is. In FIG. 2, a and b indicate both ends of the opening. When the magnification is 1.41 times, a light ray passing outside the outer peripheral point d of the lens cell of the lens 7 causes the light from the intersection point A between the photoconductor surface 12 and the extension line of the straight line passing between the above point a and the above point d. Flare appears in the direction of the end point C of the image forming range on the opposite side of the axis. Similarly, a ray passing outside the point e on the opposite side of the outer periphery of the lens cell of the additional lens 7 causes flare in the direction A'to C'of the intersection of the extension line of the straight line eb and the surface of the photoconductor 12.
又、倍率が0.5倍の時は主レンズ６及び付加レンズ10は
第２図中に鎖線で示す位置にくるが、この場合は、主レ
ンズ６のレンズセルの外周の点ｄ′,e′の外側を通る光
線によつて、遮光板11上の点a,bとｄ′,e′とを結ぶ直
線の延長と感光体12の面との交点B,B′から夫々C,C′の
方向でフレアが出る。Further, when the magnification is 0.5, the main lens 6 and the additional lens 10 come to the positions shown by the chain line in FIG. 2, but in this case, the points d ', e'on the outer circumference of the lens cell of the main lens 6 are By the rays passing through the outside, the extension of the straight line connecting the points a, b and d ', e'on the shading plate 11 and the directions of C, C'from the intersections B, B'of the surface of the photoconductor 12 respectively. Flares out.
本発明ではこのフレア光（第２図中にハツチングで示
す）を遮光するために、第１図及び第３図に示す如く主
レンズ６の両側に光軸に直角方向に主レンズ６と一体に
移動するように可動遮光板13が設けられている。可動遮
光板13を設ける範囲は、いずれの倍率の時にも、原稿よ
り反射し、レンズの外側を通る光線で固定遮光板11上の
点a,bの内側を通る光線を遮光するか、逆に云えば可動
遮光板11の最外端の点f,gより外側を通る光線が固定遮
光板の開口（ａ点とｂ点との間）を通過しないように設
定されている。可動遮光板13の範囲をこのようにしめる
と、フレア光は確実に遮光されるが、第３図より明らか
な如く可動遮光板13の両端f,g間の長さは固定遮光板11
の開口幅abより長くなる。In order to block this flare light (shown by hatching in FIG. 2) in the present invention, as shown in FIGS. 1 and 3, the main lens 6 is integrally formed on both sides of the main lens 6 in the direction perpendicular to the optical axis. A movable light shielding plate 13 is provided so as to move. The range in which the movable light-shielding plate 13 is provided reflects light from the original at any magnification and blocks light rays that pass through the outside of the lens and that pass inside the points a and b on the fixed light-shielding plate 11, or vice versa. In other words, it is set so that light rays passing outside the outermost points f and g of the movable light-shielding plate 11 do not pass through the opening (between points a and b) of the fixed light-shielding plate. By setting the range of the movable light-shielding plate 13 in this way, flare light is surely shielded, but as is apparent from FIG. 3, the length between the ends f and g of the movable light-shielding plate 13 is fixed.
Is longer than the opening width ab of.
本発明では可動遮光板13は可撓性のある遮光性材料、例
えば黒色マイラーフイルム等で作られている。なお、こ
の光学系では原稿からの反射光束は図示せむスリツトに
より走査方向（第１図において上下方向）の幅が規制さ
れているので可動遮光板13の上下方向の幅は第１図に示
す如く狭いものであつてもその上下より光が洩れること
はない。In the present invention, the movable light-shielding plate 13 is made of a flexible light-shielding material such as black Mylar film. In this optical system, the width of the light beam reflected from the original document in the scanning direction (vertical direction in FIG. 1) is regulated by a slit (not shown), so the vertical width of the movable light shielding plate 13 is shown in FIG. Even if it is narrow, light does not leak from above and below.
この遮光装置は以上の如く構成されているので、いずれ
の倍率の時にもフレア光を確実に遮光することができる
とともに、倍率変更のために主レンズ６を固定遮光板11
の開口を通過して移動する際には、可動遮光板13が固定
遮光板11に押圧されると容易に撓んで開口を通過し、通
過し終ると可動遮光板は材料の弾性により、直ちにもと
の真直に延びた状態に復元し、フレア遮光機能を発揮す
る。Since this light shielding device is configured as described above, flare light can be surely shielded at any magnification, and the main lens 6 is fixed to the light shielding plate 11 for changing the magnification.
When the movable light-shielding plate 13 is moved by passing through the opening, the movable light-shielding plate 13 is easily bent when it is pressed by the fixed light-shielding plate 11 and passes through the opening. It restores to a state of straight extension with and exhibits the flare shading function.
なお、可動遮光板を作るマイラーフイルム等は黒色にす
るのみならず表面をツヤ消しにすることが反射防止の点
で望ましい。In addition, it is desirable that the Mylar film or the like for forming the movable light-shielding plate has not only a black color but also a matte surface so as to prevent reflection.
上記の実施例ではレンズと一体に移動する可動遮光板を
マイラーフイルム等の弾性薄板で作るものとしたが、逆
に固定遮光板を弾性板とすることもでき、そうした場合
は接触時の衝撃を緩和することができる。In the above embodiment, the movable light-shielding plate that moves integrally with the lens is made of an elastic thin plate such as Mylar film.However, the fixed light-shielding plate can be an elastic plate. Can be relaxed.
又、本発明は、実施例に示した共役長不変の変倍光学系
のみならず、主レンズと一部のミラーを移動させて変倍
投影を行なう光学系にも適用することができる。The present invention can be applied not only to the variable-magnification optical system with invariant conjugate length shown in the embodiment but also to an optical system that performs variable-magnification projection by moving the main lens and some mirrors.
効果 以上の如く、本発明によれば、変倍光学系において変倍
のためにレンズを移動する場合、特に付加レンズを主レ
ンズの光軸と一致させて光路に出入れする場合に遮光板
駆動手段等を必要とせず簡単な構成でレンズを移動可能
とするとともにフレアを確実に遮光することができる。Effect As described above, according to the present invention, when the lens is moved for the magnification change in the variable power optical system, especially when the additional lens is moved in and out of the optical path in alignment with the optical axis of the main lens, the light shielding plate is driven. It is possible to move the lens with a simple structure without requiring any means, and surely shield the flare.
第１図は本発明の実施例を示す斜視図、第２図は上記実
施例の光学系において可動遮光板がない場合のフレアの
発生を説明するための図式図、第３図は本発明による遮
光装置の固定遮光板の開口と可動遮光板との関係を説明
する図式図である。 ６……主レンズ、7,8,9,10……付加レンズ 11……固定遮光板 12……感光体（結像面） 13……可動遮光板FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a schematic diagram for explaining the occurrence of flare in the optical system of the above embodiment without a movable light shielding plate, and FIG. It is a schematic diagram explaining the relationship between the opening of the fixed light-shielding plate of a light-shielding device, and a movable light-shielding plate. 6 ... Main lens, 7,8,9,10 ... Additional lens 11 ... Fixed light-shielding plate 12 ... Photoconductor (imaging surface) 13 ... Movable light-shielding plate
Claims (2)
体に光路軸に沿って所定範囲移動させ、原稿からの反射
光の結像面への変倍投影を可能とした光学系のフレア遮
光装置において、 主レンズの移動範囲の中間で光路を横断する面内に設け
られ、いずれの倍率時にも光路を遮光しない開口を有す
る固定遮光板と、主レンズと一体的に移動する如く該主
レンズの両側に設けられた可動遮光板とを有し、 上記の固定遮光板と可動遮光板とは、原稿からの反射光
の遮光範囲がオーバーラップしており、いずれの倍率時
にも可動遮光板の外側を通る光線が固定遮光板の開口を
通過しないように構成されているとともに、 上記の固定遮光板と可動遮光板の少なくとも一方が弾性
変形可能な板材で形成されていて、レンズが固定遮光部
材の開口を通り抜けて移動する際に、該弾性板材が弾性
変形することにより主レンズに設けられた可動遮光板が
固定遮光板の開口を通過可能になっていることを特徴と
する変倍光学系のフレア遮光装置。1. A flare shading device for an optical system, wherein a main lens is moved together with a carriage for carrying the main lens in a predetermined range along an optical path axis, and variable-magnification projection of reflected light from a document onto an image forming surface is possible. In the middle of the moving range of the main lens, a fixed light-shielding plate having an opening that does not block the light path at any magnification, and a fixed light-shielding plate of the main lens so as to move integrally with the main lens. It has a movable light-shielding plate provided on both sides, and the fixed light-shielding plate and the movable light-shielding plate overlap the light-shielding range of the reflected light from the original, and outside of the movable light-shielding plate at any magnification. Is configured so that light passing therethrough does not pass through the opening of the fixed light shield plate, and at least one of the fixed light shield plate and the movable light shield plate is formed of an elastically deformable plate material, and the lens is a fixed light shield member. Through the opening Flare shading of a variable-magnification optical system, characterized in that the movable light-shielding plate provided on the main lens can pass through the opening of the fixed light-shielding plate by elastically deforming the elastic plate when moving apparatus.
範囲移動可能な主レンズと、光路中の所定の位置に出入
りせしめられる付加レンズとの組合せによりなる共役長
不変の光学系であることを特徴とする特許請求の範囲第
１項に記載の変倍光学系のフレア遮光装置。2. A variable-magnification optical system comprising a main lens that is movable in a predetermined range along the optical path axis and an additional lens that can be moved in and out of a predetermined position in the optical path. The flare shading device for a variable power optical system according to claim 1, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58107966A JPH077153B2 (en) | 1983-06-17 | 1983-06-17 | Flare shading device for variable power optics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58107966A JPH077153B2 (en) | 1983-06-17 | 1983-06-17 | Flare shading device for variable power optics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60425A JPS60425A (en) | 1985-01-05 |
| JPH077153B2 true JPH077153B2 (en) | 1995-01-30 |
Family
ID=14472577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58107966A Expired - Lifetime JPH077153B2 (en) | 1983-06-17 | 1983-06-17 | Flare shading device for variable power optics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH077153B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59186706U (en) * | 1983-05-31 | 1984-12-11 | 株式会社 長谷川工務店 | Air supply and exhaust system for the cooking room |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61184526A (en) * | 1985-01-31 | 1986-08-18 | Konishiroku Photo Ind Co Ltd | Copying machine provided with optical system shielding member |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55159466A (en) * | 1979-05-30 | 1980-12-11 | Fuji Xerox Co Ltd | Exposure device of electrophotographic copying machine |
| JPS57169773A (en) * | 1981-04-13 | 1982-10-19 | Asahi Optical Co Ltd | Light shielding device for variable magnification copying machine |
-
1983
- 1983-06-17 JP JP58107966A patent/JPH077153B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59186706U (en) * | 1983-05-31 | 1984-12-11 | 株式会社 長谷川工務店 | Air supply and exhaust system for the cooking room |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60425A (en) | 1985-01-05 |
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