JPH02210340A - Light quantity correcting device - Google Patents
Light quantity correcting deviceInfo
- Publication number
- JPH02210340A JPH02210340A JP3079389A JP3079389A JPH02210340A JP H02210340 A JPH02210340 A JP H02210340A JP 3079389 A JP3079389 A JP 3079389A JP 3079389 A JP3079389 A JP 3079389A JP H02210340 A JPH02210340 A JP H02210340A
- Authority
- JP
- Japan
- Prior art keywords
- light
- shielding plate
- light shielding
- lens
- optical axis
- 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
- 230000003287 optical effect Effects 0.000 claims description 27
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Optical Systems Of Projection Type Copiers (AREA)
- Control Of Exposure In Printing And Copying (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はスリット露光型画像露光装置に用いて好適な光
量補正装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a light amount correction device suitable for use in a slit exposure type image exposure apparatus.
第２回は従来のスリット露光型画像露光装置としての複
写機の光学系の構成を表わしている。１は図示せぬ光源
により照射される原稿であり、その原稿１により反射さ
れた光は図示せぬスリットによりその幅が規制された後
、ミラー２．３．４により反射され、レンズ５に入射す
る。レンズ５より出射された光はミラー６に反射され、
像担持体としてのドラム７に照射される。原稿１が図中
右方向にスキャンされるとともに、ドラム７が回転され
、ドラム７上に原稿１の全体の像が形成される。このド
ラム７上の潜像が現像され、所定の用紙に複写される、
第３図に示すように、レンズ５より出射された光は、そ
の先軸付近の強度が最も強く、その周辺部の強度はコサ
イン４乗則に従って低下する。従ってそのままだとドラ
ム７上における光量が不均一となるので、レンズ５の前
方又は後方に遮光板８が設けられている。The second article shows the configuration of the optical system of a copying machine as a conventional slit exposure type image exposure device. Reference numeral 1 designates an original that is illuminated by a light source (not shown), and the light reflected by the original 1 has its width regulated by a slit (not shown), is reflected by a mirror 2.3.4, and enters a lens 5. do. The light emitted from the lens 5 is reflected by the mirror 6,
The drum 7 serving as an image carrier is irradiated with the light. As the original 1 is scanned rightward in the figure, the drum 7 is rotated, and an image of the entire original 1 is formed on the drum 7. The latent image on the drum 7 is developed and copied onto a predetermined sheet of paper. As shown in FIG. The intensity decreases according to the cosine fourth power law. Therefore, if left as is, the amount of light on the drum 7 would become non-uniform, so a light shielding plate 8 is provided in front or behind the lens 5.
遮光板８は例えば第４図に示すように、遮光する位置に
おいて光軸付近を通る光束１１を、軸外を通る光束１２
．１３より大きく減衰するように配置される。For example, as shown in FIG. 4, the light shielding plate 8 blocks a light flux 11 passing near the optical axis at a light shielding position, and a light flux 12 passing off the axis.
．． 13.
また例えば第５図に示すように遮光板８をｙ軸と平行に
配置することも提案されている。It has also been proposed to arrange the light shielding plate 8 parallel to the y-axis as shown in FIG. 5, for example.
このような遮光板を設けることにより光軸近傍の光量が
周辺部に較べ低下するので、全体にわたって均一に分布
した光を得ることができる。By providing such a light shielding plate, the amount of light in the vicinity of the optical axis is lower than in the peripheral area, so that it is possible to obtain light that is uniformly distributed over the entire area.
しかしながら第４図に示すように原稿１をスキャンする
方向（ｙ軸方向）の一方の側（この例においては下側）
に遮光板８を配置し、その方向と垂直な方向（Ｘ軸方向
）の略全体にわたって遮光するようにする場合、遮光板
８とレンズ５の距離をある程度大きくしないと効率的な
遮光が困難になる欠点がある。その結果像の倍率を変更
するためレンズ５を移動させるとき、遮光板８も同時に
移動させる必要があるが、距離の長いものが移動するの
で、装置が大型化かつ複雑化する欠点がある。However, as shown in Figure 4, one side (lower side in this example) in the scanning direction (y-axis direction) of the original 1
When arranging the light shielding plate 8 to block light almost entirely in the direction perpendicular to that direction (X-axis direction), it is difficult to efficiently shield light unless the distance between the light shielding plate 8 and the lens 5 is increased to a certain extent. There is a drawback. As a result, when the lens 5 is moved to change the magnification of the image, it is necessary to move the light shielding plate 8 at the same time, but since a long distance is moved, the device becomes larger and more complicated.
また第５図に示すように遮光板８をｙ軸と平行に配置す
る方法においては、レンズ５と遮光板８の距離を小さく
できることが知られている。しかしながらレンズ５の光
の透過量は必ずしも理論値通りには設定されないし、ま
たコサイン４乗則以外の要因で出射光量が低下すること
もある。従って所望の均一な光量分布を得るためには、
ドラム７の位１（又はそれと均等な位置）に配置した受
光素子アレイにより光量分布を実際に測定する必要があ
る。このため遮光板８として種々の幅のものを複数用意
し、その中から最適なものを選択しなければならず、不
便であった。Furthermore, it is known that the distance between the lens 5 and the light shielding plate 8 can be reduced by arranging the light shielding plate 8 parallel to the y-axis as shown in FIG. However, the amount of light transmitted through the lens 5 is not necessarily set to the theoretical value, and the amount of emitted light may decrease due to factors other than the cosine fourth power law. Therefore, in order to obtain the desired uniform light intensity distribution,
It is necessary to actually measure the light amount distribution using a light receiving element array placed at position 1 of the drum 7 (or at a position equivalent thereto). For this reason, it is necessary to prepare a plurality of light shielding plates 8 of various widths and select the optimum one from among them, which is inconvenient.
本発明は斯かる状況に鑑みなされたもので、遮光板の形
状を変えることなく簡単かつ短時間に所望の光量分布が
得られるようにするものである。The present invention was made in view of this situation, and it is an object of the present invention to easily and quickly obtain a desired light intensity distribution without changing the shape of the light shielding plate.
本発明の光量補正装置は、原稿からの光が照射される像
担持体と、スリット、ミラー等からなり、原稿からの光
を像担持体に案内する案内手段と、案内手段により案内
される光の光路中に配置され、原稿の像を像担持体上に
生成するレンズと、レンズの前方又は後方に配置され、
光の一部を遮断する遮光板と、遮光板を回動自在に支持
する支持手段とを備える。The light amount correction device of the present invention includes an image carrier to which light from an original is irradiated, a guide means that includes a slit, a mirror, etc., and guides the light from the document to the image carrier, and a light guided by the guide means. a lens disposed in the optical path of the image carrier to generate an image of the original on the image carrier; and a lens disposed in front or behind the lens;
The light shielding device includes a light shielding plate that blocks part of light and a support means that rotatably supports the light shielding plate.
原稿からの光は例えばスリット、ミラー等よりなる案内
手段に案内され、レンズを介してドラム等の像担持体に
照射される。レンズの前方又は後方には遮光板が配置さ
れている。この遮光板は回動自在とされているので、そ
の回動位置の簡単な調整により、所望の均一な光量分布
を得ることができる。Light from the original is guided by a guide means such as a slit or a mirror, and is irradiated onto an image carrier such as a drum through a lens. A light shielding plate is placed in front or behind the lens. Since this light shielding plate is rotatable, a desired uniform light amount distribution can be obtained by simply adjusting its rotational position.
従ってこれまで長い時間を要していた光量調整を短時間
で簡単に行うことができる。Therefore, the light amount adjustment, which previously took a long time, can be easily performed in a short time.
第１図は本発明の遮光板とレンズとの関係を表わしてい
る。同図において２１は所定の幅に形成された遮光板で
あり、光軸２２を通り、ｙ軸から所定の角度θだけ傾斜
して配置されている。第６図は第１図の遮光板２１を光
軸２２の方向から・見た図である。スリット、ミラー等
よりなる案内手段、レンズ、ドラム等の本発明の他の構
成は第２図に示した場合と同様である。FIG. 1 shows the relationship between the light shielding plate and the lens of the present invention. In the figure, reference numeral 21 denotes a light shielding plate formed to have a predetermined width, which passes through the optical axis 22 and is arranged to be inclined at a predetermined angle θ from the y-axis. FIG. 6 is a view of the light shielding plate 21 of FIG. 1 viewed from the direction of the optical axis 22. Other structures of the present invention, such as the guide means consisting of slits, mirrors, etc., lenses, drums, etc., are the same as those shown in FIG.
第６図より明らかなように、遮光板２１を光軸２２を中
心として回動し、角度θを変更したとしても、レンズ５
の中心（光軸）付近を通る光束１１の遮光量は殆んど変
化せず、一定である。これに対して光軸から離れたとこ
ろを通る光束１２又は１３の遮光量は、角度θがＯｏが
ら９０’の範囲で大きくなる程大きくなる。As is clear from FIG. 6, even if the light shielding plate 21 is rotated around the optical axis 22 and the angle θ is changed, the lens 5
The amount of shielding of the light beam 11 passing near the center (optical axis) of the light beam hardly changes and remains constant. On the other hand, the amount of shielding of the light beam 12 or 13 passing away from the optical axis increases as the angle θ increases in the range from Oo to 90'.
第７図は原稿面の光量分布がフラットでレンズ５のＦＮ
ｏを６．５、焦点距離を２７０ｍｍ、Ｌｉ’、ｔズ５と
その前方（原稿１側）に配置された遮光板２１との距離
を２５ｍｍとした場合において、遮光板２１の角度θを
変化させたときの光量分布の変化を表わしている。横軸
はＸ軸方向の位置（ドラム７の回転軸方向の位置）を、
縦軸は光のレベルを、各々表わしている。同図より、遮
光板２１のｙ軸に対する角度θを４０°にすると周辺部
の光量が光軸近傍に較べ減少し過ぎるが、３０”にする
と。Figure 7 shows that the light intensity distribution on the document surface is flat and the FN of lens 5 is
The angle θ of the light shielding plate 21 is changed when o is 6.5, the focal length is 270 mm, and the distance between the Li', t's 5 and the light shielding plate 21 placed in front of it (on the document 1 side) is 25 mm. It shows the change in the light amount distribution when The horizontal axis represents the position in the X-axis direction (the position in the rotational axis direction of the drum 7).
The vertical axis represents the light level. As shown in the figure, if the angle θ of the light shielding plate 21 with respect to the y-axis is set to 40°, the amount of light in the peripheral area decreases too much compared to the vicinity of the optical axis, but if it is set to 30''.
略均−な光量分布が得られることが判る。It can be seen that a substantially uniform light amount distribution can be obtained.
第８図は遮光板２１を光軸２２を中心として回動自在に
支持する支持手段の構成を表わしている。FIG. 8 shows the structure of a support means that supports the light shielding plate 21 rotatably about the optical axis 22.
この実施例においては遮光板２１が、支持部材としての
円形の枠６１に固定されている。従って枠６１を回転さ
せることにより遮光板２１の傾斜角度を調整することが
できる。In this embodiment, the light shielding plate 21 is fixed to a circular frame 61 as a support member. Therefore, by rotating the frame 61, the inclination angle of the light shielding plate 21 can be adjusted.
遮光板２１（又は枠６１）は所望の特性が得られたとき
ネジ、接着剤等によりその位置に固定される。またこの
実施例における遮光板２１は、例えば写真レンズの前に
フィルタを取り付ける構造のようにして、レンズ５の鏡
筒（図示せず）に取り付けることができる。従って変倍
の際レンズ５とともに移動できるため、構造が容易で小
型化が図れる。The light shielding plate 21 (or frame 61) is fixed in position with screws, adhesive, etc. when desired characteristics are obtained. Further, the light shielding plate 21 in this embodiment can be attached to the lens barrel (not shown) of the lens 5, for example, like a structure in which a filter is attached in front of a photographic lens. Therefore, since it can move together with the lens 5 when changing the magnification, the structure can be simplified and the size can be reduced.
第９図は遮光板２１を光軸２２を中心として回動自在に
支持する支持部材の他の構成を表わしている。同図にお
いて３１．３２はレンズ５の上下に略平行に配置された
駆動部材であり、ピン３３゜３５が各々挿通されている
。３４．３６は遮光板２１の両端部に形成された長孔で
あり、ピン３３．３５が各々挿通されている。従って駆
動部材３１．３２を各々左右の反対方向に平行移動させ
ることにより、遮光板２１を光軸２２を中心として回動
調整することができる。FIG. 9 shows another configuration of the support member that supports the light shielding plate 21 rotatably about the optical axis 22. In the figure, reference numerals 31 and 32 indicate driving members arranged substantially parallel to each other above and below the lens 5, through which pins 33 and 35 are inserted. 34 and 36 are elongated holes formed at both ends of the light shielding plate 21, into which pins 33 and 35 are inserted, respectively. Therefore, by moving the driving members 31 and 32 in parallel in opposite left and right directions, the light shielding plate 21 can be rotated about the optical axis 22.
第１０図は本発明の第２の実施例を表わしている。この
実施例においては２つの遮光板２ ］、と４１が光軸２
２上で交叉するように配置されている。FIG. 10 represents a second embodiment of the invention. In this embodiment, two light shielding plates 2] and 41 are optical axis 2.
They are arranged so as to intersect on 2.
遮光板２１と４１は光軸２２と同軸のピン４２により相
互に回転自在に結合されている。第１１図は第１０図の
遮光板２１．４１を光軸方向から見た図である。The light shielding plates 21 and 41 are rotatably coupled to each other by a pin 42 coaxial with the optical axis 22. FIG. 11 is a diagram of the light shielding plate 21.41 of FIG. 10 viewed from the optical axis direction.
この実施例の場合遮光板２１と４１はｙ軸との角度が同
一になっているが、両者の角度が異なるようにしても、
光量の分布はｙ軸に対し左右対称となるので問題はない
。In this embodiment, the light shielding plates 21 and 41 have the same angle with the y-axis, but even if they are made to have different angles,
There is no problem because the distribution of the amount of light is symmetrical about the y-axis.
第１２図は第２の実施例において、遮光板２１及び４１
とｙ軸との角度θを変化させた場合における光量分布の
変化の壁子を表わしている。尚測定条件は第７図におけ
る場合と同一である。角度θを３７°にすると光軸近傍
の光量が周辺部より大きく減衰され、相対的に周辺部の
光量の方が光軸近傍より大きくなる。４０″にするとや
はり周辺部の光量の方が大きいが、中間部においては略
均−となる。FIG. 12 shows light shielding plates 21 and 41 in the second embodiment.
It shows the wall of change in the light amount distribution when the angle θ between the y-axis and the y-axis is changed. The measurement conditions are the same as in FIG. 7. When the angle θ is set to 37°, the amount of light near the optical axis is attenuated more than the amount of light at the periphery, and the amount of light at the periphery becomes relatively larger than that near the optical axis. When it is set to 40'', the amount of light is still larger in the peripheral area, but it is approximately equal in the intermediate area.
第１３図は２つの遮光板を回転自在に支持する支持部材
の構成を表わしており、第８図における遮光板２１が取
り付けられた枠６１に、遮光板４１が取り付けられたも
う１つの枠６２を付加した構成になっている。２つの遮
光板２１と４１は光軸上で交叉するように配置されてい
る。調整や取付あるいは固定方法は第８図における場合
と同様である。FIG. 13 shows the configuration of a support member that rotatably supports two light-shielding plates, in which a frame 61 to which the light-shielding plate 21 in FIG. 8 is attached and another frame 62 to which the light-shielding plate 41 is attached. It has a configuration with the addition of . The two light shielding plates 21 and 41 are arranged so as to intersect on the optical axis. The adjustment, mounting or fixing method is the same as in FIG.
第１４図は２つの遮光板の支持部材の他の構成を表わし
ている。５１は駆動部材であり、その−端にピン５２が
植設されている。５３は遮光板２１の一端に形成された
長孔であり、ピン５２が挿通されている。同様に駆動部
材５４に植設したピン５５が遮光板４１の一端に形成し
た長孔５６に挿通されている。従って駆動部材５１．５
４を各々左右の反対方向に移動させることにより、遮光
板２１と４１をピン４２を支点として回動させることが
できる。FIG. 14 shows another configuration of the support members for two light shielding plates. Reference numeral 51 is a driving member, and a pin 52 is installed at the lower end of the driving member. 53 is a long hole formed at one end of the light shielding plate 21, into which the pin 52 is inserted. Similarly, a pin 55 implanted in the driving member 54 is inserted into a long hole 56 formed at one end of the light shielding plate 41. Therefore the drive member 51.5
4 in opposite left and right directions, the light shielding plates 21 and 41 can be rotated about the pin 42 as a fulcrum.
遮光板は鉄、合成樹脂等不透明な材料により構成するこ
とができる。また透明なガラス板に蒸着、スパッタリン
グ等により不透明な部分（遮光部）を形成するようにす
ることも可能である。The light shielding plate can be made of an opaque material such as iron or synthetic resin. It is also possible to form an opaque portion (light-shielding portion) on a transparent glass plate by vapor deposition, sputtering, or the like.
またランプその他の理由で発生する非対称な光量分布は
遮光板の回動中心を光軸からずらすことにより補正する
ことができる。Furthermore, an asymmetrical light intensity distribution caused by a lamp or other reasons can be corrected by shifting the center of rotation of the light shielding plate from the optical axis.
尚本発明は複写機以外の装置にも応用が可能であること
は明らかである。It is clear that the present invention can be applied to devices other than copying machines.
以上の如く本発明によれば、レンズの前方又は後方に配
置した遮光板を回動自在に支持するようにしたので、遮
光板の形状を変更することなく光量分布を簡単かつ短時
間に微調整することができる。また異なるレンズ系の場
合においても同一の遮光板を共用することが可能になる
。さらに装置の大型化が防止される。加えて遮光板を鏡
筒に取り付けるようにすれば、機構をより簡単にするこ
とができる。As described above, according to the present invention, the light shielding plate placed in front or behind the lens is rotatably supported, so the light intensity distribution can be finely adjusted easily and in a short time without changing the shape of the light shielding plate. can do. Further, even in the case of different lens systems, it becomes possible to share the same light shielding plate. Furthermore, the device is prevented from increasing in size. In addition, the mechanism can be made simpler by attaching a light shielding plate to the lens barrel.
第１図は本発明の第１の実施例の遮光板とレンズの斜視
図。
第２図は従来のスリット露光型画像露光装置の光学系の
側面図。
第３図は光量分布の特性図、
第４図は従来の遮光板の第１の例の正面図、第５図は従
来の遮光板の第２の例の正面図、第６図は本発明の第１
の実施例の遮光板の正面図。
第７図は第６図の実施例の光量分布の特性図、第８図は
本発明の第１の実施例の遮光板の支持部材の斜視図、
第９図は本発明の第１の実施例の遮光板の他の支持部材
の正面図、
第１０図は本発明の第２の実施例の遮光板とレンズの斜
視図、
第１１図は本発明の第２の実施例の遮光板の正面図。
第１２図は第１１図の実施例の光量分布の特性図、
第１３図は本発明の第２の実施例の遮光板の支持部材の
斜視図、
第１４図は本発明の第２の実施例の遮光板の他の支持部
材の正面図である。
１・・・原稿
２．３．４・・・ミラー
５・・・レンズ
６・・・ミラー
７・・・ドラム
８・・・遮光板
１１．１２，１３・・・光
２１・・・遮光板
２２・・・光軸
３１゜
３３ ・
３４ ・
３５ ＠
３６ ・
４１ ・
４２ ・
５１ ・
５２ ・
５３ ・
５４ ・
５５ ・
５６ ・
６１゜
・駆動部材
・・ピン
・・長孔
・・ピン
・・長孔
・・遮光板
・・ピン
・・駆動部材
・・ピン
・・長孔
・・駆動部材
・・ピン
・・長孔
６２ ・・枠
以上
第１図
特許出願人 旭光学工業株式会社FIG. 1 is a perspective view of a light shielding plate and a lens according to a first embodiment of the present invention. FIG. 2 is a side view of the optical system of a conventional slit exposure type image exposure apparatus. Fig. 3 is a characteristic diagram of light intensity distribution, Fig. 4 is a front view of a first example of a conventional light shielding plate, Fig. 5 is a front view of a second example of a conventional light shielding plate, and Fig. 6 is a front view of a second example of a conventional light shielding plate. 1st of
FIG. 3 is a front view of the light shielding plate of the embodiment. FIG. 7 is a characteristic diagram of the light intensity distribution of the embodiment shown in FIG. 6, FIG. 8 is a perspective view of a supporting member of a light shielding plate according to the first embodiment of the present invention, and FIG. 9 is a diagram of the first embodiment of the present invention. FIG. 10 is a front view of another support member of the light shielding plate of the example, FIG. 10 is a perspective view of the light shielding plate and lens of the second embodiment of the present invention, and FIG. 11 is a view of the light shielding plate of the second embodiment of the present invention. Front view. FIG. 12 is a characteristic diagram of the light intensity distribution of the embodiment shown in FIG. 11, FIG. 13 is a perspective view of a supporting member of a light shielding plate according to a second embodiment of the present invention, and FIG. 14 is a diagram of a second embodiment of the present invention. FIG. 7 is a front view of another support member of the example light shielding plate. 1... Original 2.3.4... Mirror 5... Lens 6... Mirror 7... Drum 8... Light blocking plate 11. 12, 13... Light 21... Light blocking plate 22...Optical axis 31° 33 ・ 34 ・ 35 @ 36 ・ 41 ・ 42 ・ 51 ・ 52 ・ 53 ・ 54 ・ 55 ・ 56 ・ 61° ・Drive member ・Pin ・Long hole ・Pin ・Length Hole...Shade plate...Pin...Drive member...Pin...Long hole...Drive member...Pin...Long hole 62...More than frame Figure 1 Patent Applicant: Asahi Optical Industry Co., Ltd.
Claims (4)
、ミラー等からなり、原稿からの光を像担持体に案内す
る案内手段と、 案内手段により案内される光の光路中に配置され、原稿
の像を像担持体上に生成するレンズと、レンズの前方又
は後方に配置され、光の一部を遮断する遮光板と、 遮光板を回動自在に支持する支持手段とを備える光量補
正装置。(1) An image carrier to which light from the original is irradiated, a guide means consisting of a slit, a mirror, etc. that guides the light from the original to the image carrier, and an image carrier disposed in the optical path of the light guided by the guide means. A lens for generating an image of a document on an image carrier; a light-shielding plate disposed in front or behind the lens for blocking part of light; and supporting means for rotatably supporting the light-shielding plate. Light amount correction device.
配置されている請求項１の光量補正装置。(2) The light amount correcting device according to claim 1, wherein the light shielding plate is arranged so as to substantially pass through the optical axis of the lens.
光軸に沿って移動する請求項１又は２の光量補正装置。(3) The light amount correcting device according to claim 1 or 2, wherein the light shielding plate moves integrally with the lens along its optical axis during zooming.
中心として回動自在に支持する請求項１、２又は３の光
量補正装置。(4) The light amount correcting device according to claim 1, 2 or 3, wherein the support means supports the light shielding plate rotatably about the optical axis of the lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3079389A JPH02210340A (en) | 1989-02-09 | 1989-02-09 | Light quantity correcting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3079389A JPH02210340A (en) | 1989-02-09 | 1989-02-09 | Light quantity correcting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02210340A true JPH02210340A (en) | 1990-08-21 |
Family
ID=12313561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3079389A Pending JPH02210340A (en) | 1989-02-09 | 1989-02-09 | Light quantity correcting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02210340A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0902335A2 (en) * | 1997-09-11 | 1999-03-17 | Canon Kabushiki Kaisha | Image reading apparatus |
| JP2006119481A (en) * | 2004-10-25 | 2006-05-11 | Ricoh Co Ltd | Image reading unit, image forming apparatus equipped with the image reading unit, and method for assembling the image reading unit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6052838A (en) * | 1983-09-02 | 1985-03-26 | Fuji Xerox Co Ltd | Exposing device of copying machine |
| JPS63163836A (en) * | 1986-08-30 | 1988-07-07 | Ricoh Co Ltd | Illuminance speckle corrector for slit exposure type optical system |
-
1989
- 1989-02-09 JP JP3079389A patent/JPH02210340A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6052838A (en) * | 1983-09-02 | 1985-03-26 | Fuji Xerox Co Ltd | Exposing device of copying machine |
| JPS63163836A (en) * | 1986-08-30 | 1988-07-07 | Ricoh Co Ltd | Illuminance speckle corrector for slit exposure type optical system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0902335A2 (en) * | 1997-09-11 | 1999-03-17 | Canon Kabushiki Kaisha | Image reading apparatus |
| EP0902335A3 (en) * | 1997-09-11 | 2000-04-12 | Canon Kabushiki Kaisha | Image reading apparatus |
| JP2006119481A (en) * | 2004-10-25 | 2006-05-11 | Ricoh Co Ltd | Image reading unit, image forming apparatus equipped with the image reading unit, and method for assembling the image reading unit |
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