JPH01114465A - Liquid crystal shutter array head - Google Patents
Liquid crystal shutter array headInfo
- Publication number
- JPH01114465A JPH01114465A JP62272187A JP27218787A JPH01114465A JP H01114465 A JPH01114465 A JP H01114465A JP 62272187 A JP62272187 A JP 62272187A JP 27218787 A JP27218787 A JP 27218787A JP H01114465 A JPH01114465 A JP H01114465A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- crystal shutter
- shutter array
- light source
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 40
- 238000002834 transmittance Methods 0.000 claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 8
- 229910052736 halogen Inorganic materials 0.000 abstract description 4
- 150000002367 halogens Chemical class 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- 239000013307 optical fiber Substances 0.000 description 18
- 238000010586 diagram Methods 0.000 description 6
- 108091008695 photoreceptors Proteins 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は液晶シャッタアレイヘッドの光量分布調整方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for adjusting light intensity distribution of a liquid crystal shutter array head.
詳しくは液晶シャッタアレイヘッドにおいて、液晶シャ
ッタアレイの光透過率分布を光源部の光量分布により補
整したことにより液晶シャッタアレイからの出射光量を
均一化したものである。Specifically, in the liquid crystal shutter array head, the light transmittance distribution of the liquid crystal shutter array is corrected by the light amount distribution of the light source section, so that the amount of light emitted from the liquid crystal shutter array is made uniform.
従来の液晶シャッタアレイヘッドは、特に長尺液晶シャ
ッタの場合、その製造上の特徴として長手方向で中央骨
の光透過率が高く、両端に行くに従い光透過率が低くな
る傾向であった。In conventional liquid crystal shutter array heads, especially in the case of long liquid crystal shutters, the manufacturing feature is that the light transmittance is high in the central bone in the longitudinal direction, and the light transmittance tends to decrease toward both ends.
しかし前述の従来技術では液晶シャッタアレイヘッドか
らの出射光量が均一でないという問題点を有する。そこ
で本発明は、この様な問題点を解決するもので、その目
的とするところは、出射光量が均一な液晶シャッタアレ
イヘッドを提供するところにある。However, the above-mentioned conventional technology has a problem in that the amount of light emitted from the liquid crystal shutter array head is not uniform. SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a liquid crystal shutter array head that emits a uniform amount of light.
点光源を面光源に置きかえる光源部と、一端を矩形に結
束し、他端をライン状に並べたファイバーブロックと、
ライン状にシャッタを配列し選択的に開閉駆動させる液
晶シャッタアレイから構成される液晶シャッタアレイヘ
ッドに於いて、長尺の液晶シャッタアレイの光透過率分
布を光源部の光量分布により補整することにより出射光
量が均一な液晶シャッタアレイヘッドにすることができ
る。A light source section that replaces a point light source with a surface light source, a fiber block with one end tied into a rectangle and the other end arranged in a line,
In a liquid crystal shutter array head consisting of a liquid crystal shutter array in which shutters are arranged in a line and selectively driven to open and close, the light transmittance distribution of the long liquid crystal shutter array is compensated by the light intensity distribution of the light source section. A liquid crystal shutter array head with a uniform amount of emitted light can be provided.
本発明の上記の構成によれば、点光源を面光源に変換す
る光源部の半球面形状の反射板と前記点光源であるライ
トチューブとの相対位置を調整することにより、ファイ
バーブロック矩形側端面に入射する光を端部で高く中央
部で低い光量分布とすることにより、前記ファイバーブ
ロックのライン状端面からの出射光量を中央で低く両端
に行くに従い高（することができ、前記長尺液晶シャッ
タアレイの透過光量分布である長手方向で中央部の光透
過率が高く両端に行くに従い光透過率が低くなる傾向を
補整し、結果として出射光量が均一な液晶シャッタアレ
イヘッドにすることができた。According to the above configuration of the present invention, by adjusting the relative position between the hemispherical reflector of the light source section that converts a point light source into a surface light source and the light tube that is the point light source, the rectangular side end face of the fiber block is adjusted. By making the light incident on the fiber block have a light intensity distribution that is high at the ends and low at the center, the amount of light emitted from the linear end face of the fiber block can be made to be low at the center and increase toward both ends. This compensates for the tendency of the shutter array's transmitted light amount distribution, which is high in the center in the longitudinal direction and decreases towards both ends, resulting in a liquid crystal shutter array head with a uniform output light amount. Ta.
第１図は本発明の実施例における原理構成図である。１
の光源部は、点光源であるハロゲンチューブ１ａと、点
光源からの放射光を、面光源に交換するための半球面状
の反射板１ｂよりなる。FIG. 1 is a diagram showing the principle configuration of an embodiment of the present invention. 1
The light source section includes a halogen tube 1a which is a point light source, and a hemispherical reflecting plate 1b for exchanging the emitted light from the point light source with a surface light source.
点光源１ａからの光線は、半球面状の反射板１ｂ内壁面
により反射し、２の光フアイバーブロック部の矩形結束
部側端面へ入射する。光経路の途中には、光を折り曲げ
かつ赤外線を透過するようなハープミラー３及び、光量
レベルを調整するためのＮＤフィルター４、光フアイバ
−ブロック２端面を冷却するための冷却ファン５が設け
られている。The light beam from the point light source 1a is reflected by the inner wall surface of the hemispherical reflecting plate 1b, and is incident on the side end surface of the rectangular bundle part of the optical fiber block part 2. In the middle of the optical path, a harp mirror 3 that bends light and transmits infrared rays, an ND filter 4 for adjusting the light intensity level, and a cooling fan 5 for cooling the end face of the optical fiber block 2 are provided. ing.
２の光フアイバーブロック部は、複数の光フアイバー素
線をシート状に並べた光フアイバーシート複数枚から成
り、入射側端面は、前記光フアイバーシートを積み重ね
て結束接着された後光学鏡面となるように研澄される。The optical fiber block section 2 is made up of a plurality of optical fiber sheets in which a plurality of optical fiber strands are arranged in a sheet shape, and the end surface on the incident side is made to have an optical mirror surface after the optical fiber sheets are stacked and bonded together. be refined.
出射側端面は、前記入射端面で光フアイバーシート重畳
方向に対して端側にある光フアイバーシートはど端側に
中央にあるものほど中央になるよう順にライン状に配列
され、上下の押え板により固定される。さらにその押え
板の端面には、液晶シャッターアレイ７に光を収束入射
させるためのＲ面ミラー６が紫外線接着剤により固定さ
れている。On the output side end face, the optical fiber sheets located on the end side with respect to the optical fiber sheet overlapping direction on the input end face are arranged in a line in order so that the closer to the center is on the end side, the more the optical fiber sheets are placed in the center. Fixed. Furthermore, an R-plane mirror 6 for converging and incident light on the liquid crystal shutter array 7 is fixed to the end face of the holding plate with an ultraviolet adhesive.
Ｒ面ミラー６より収束されて出射した光は、液晶ジェッ
タを照射する。液晶シャッタアレイ７は、分解能に応じ
て、２０００個以上のシャッタが配列され、各々、シャ
ッタ駆動回路からの信号に応じて、選択的に開閉駆動さ
れる。The light converged and emitted from the R-plane mirror 6 irradiates the liquid crystal jetter. The liquid crystal shutter array 7 has 2000 or more shutters arranged according to the resolution, and each shutter is selectively driven to open or close according to a signal from a shutter drive circuit.
液晶シャックが開くことにより、光は、透過され、８の
セルフォックレンズアレイに入射する。When the liquid crystal shack is opened, light is transmitted and enters eight SELFOC lens arrays.
８のセルフォックレンズアレイは、所定の焦点距離を持
ち、焦点位置に、１対１の正位実像を形成することがで
きる。The 8 SELFOC lens arrays have a predetermined focal length and can form a one-to-one orthogonal real image at the focal position.
以上が、液晶シャッタアレイヘッドの構成であり、例え
ば、電子写真プロセスを使用したプリンタに上記ヘッド
を組み込む場合は、８のセルフォックレンズアレイの光
出射の正位実像形成位置に、感光体ドラム９表面を設置
することにより、感光体ドラム９表面を露光することに
なる。The above is the configuration of the liquid crystal shutter array head. For example, when the head is incorporated into a printer using an electrophotographic process, the photoreceptor drum 9 By setting the surface, the surface of the photoreceptor drum 9 is exposed.
この露光時の露光量に、ムラがあると、高品位な印字品
質を得ることはできない。If there is any unevenness in the amount of exposure during this exposure, high print quality cannot be obtained.
第２図に、本発明の実施例における分解斜視図を示す。FIG. 2 shows an exploded perspective view of an embodiment of the present invention.
ここで、後の説明のため、ｘ、ｙ、ｚ軸を図示のように
定めることにする。Here, for later explanation, the x, y, and z axes will be defined as shown.
第３図に、本発明による、光フアイバーブロック部２の
矩形結束部端面へ入射する光量分布を縦軸にｙ方向の位
置、横軸に光量をとって、実線１００により示す。ここ
で、第３図の破線２００は従来技術の光フアイバーブロ
ック部２の矩形結束部端面入射光量分布を示したもので
ある。本発明によれば、点光源を面光源に変換する光源
部１の半球面形状の反射板１ｂと前記点光源であるハロ
ゲンチューブ１ａとの相対位置を調整することにより、
光フアイバーブロック２の矩形側端面に入射する光量分
布を第３図の実線に示すようにｙ軸の方向の中央で低く
両端で高い光量分布を得ることができる。第２図に図示
するように、前記光フアイバーブロック２を構成する光
フアイバー素線は、矩形結束部側でｙ軸について端側に
あるほど他端のライン状結束部側ではｙ軸について端側
に、矩形結束部側でｙ軸について中央にあるものほどラ
イン状結束部側でｙ軸について中央に配置されるため、
光フアイバーブロック２を通過し８面ミラー６により液
晶シャッタアレイ７上に反射収束する光のＸ軸方向の光
量分布は、第４図の実線で示すように両端はど光量が大
きく中央はど小さい分布となる。ここで、第４図は縦軸
に液晶シャッタアレイ入射量、横軸にＸ方向の位置をと
り光景分布を示したもので、破線は、従来技術による液
晶シャッタアレイ入射光量分布を示す。さらに、前記液
晶シャッタアレイ入射光が第６図に示される光量透過率
分布特性を有する液晶シャッタアレイ７を透過し、セル
フォックレンズアレイ８で所定の焦点距離において結像
された像のＸ軸方向の光景分布は第５図の実線で示され
るようになる。In FIG. 3, the distribution of the amount of light incident on the end face of the rectangular bundle of the optical fiber block 2 according to the present invention is shown by a solid line 100, with the vertical axis representing the position in the y direction and the horizontal axis representing the amount of light. Here, a broken line 200 in FIG. 3 shows the distribution of the amount of light incident on the end face of the rectangular bundle of the optical fiber block section 2 of the prior art. According to the present invention, by adjusting the relative position of the hemispherical reflector 1b of the light source unit 1 that converts a point light source into a surface light source and the halogen tube 1a that is the point light source,
As shown by the solid line in FIG. 3, the light intensity distribution incident on the rectangular end face of the optical fiber block 2 is low at the center in the y-axis direction and high at both ends. As shown in FIG. 2, the optical fiber strands constituting the optical fiber block 2 are arranged such that the closer they are to the y-axis on the rectangular bundle side, the closer they are to the y-axis at the other end of the linear bundle. In this case, the closer the rectangular binding part is to the center on the y-axis, the more the linear binding part is located in the center on the y-axis.
The light intensity distribution in the X-axis direction of the light that passes through the optical fiber block 2 and is reflected and converged on the liquid crystal shutter array 7 by the 8-sided mirror 6 is such that the light intensity is large at both ends and small at the center, as shown by the solid line in Fig. 4. distribution. Here, FIG. 4 shows the scene distribution, with the vertical axis representing the amount of light incident on the liquid crystal shutter array and the horizontal axis representing the position in the X direction.The broken line represents the distribution of the amount of light incident on the liquid crystal shutter array according to the prior art. Further, the incident light on the liquid crystal shutter array is transmitted through the liquid crystal shutter array 7 having the light quantity transmittance distribution characteristics shown in FIG. The scene distribution is shown by the solid line in FIG.
ここで、第５図は横軸にＸ方向の位置を縦軸に液晶シャ
ッタアレイヘッドの最終出射光量をとって光量分布を示
し、第６図は横軸にＸ方向の位置を縦軸に液晶シャッタ
アレイの光量透過率をとって光量透過率分布を示してい
る。尚、第５図には比較のため従来技術による液晶シャ
ッタアレイヘッドの光量分布を破線により図示しである
。第５図より、本発明により出射光量が均一な液晶シャ
ッタアレイヘッドが得られたことがわかる。Here, Fig. 5 shows the light intensity distribution by taking the position in the X direction on the horizontal axis and the final output light amount of the liquid crystal shutter array head on the vertical axis, and Fig. 6 shows the light intensity distribution by taking the position in the X direction on the horizontal axis and the position in the The light amount transmittance distribution is shown by taking the light amount transmittance of the shutter array. Incidentally, in FIG. 5, the light amount distribution of a liquid crystal shutter array head according to the prior art is shown by a broken line for comparison. From FIG. 5, it can be seen that the present invention provides a liquid crystal shutter array head with a uniform amount of emitted light.
以上述べたように本発明によれば、点光源を面光源に変
換する光源部の半球面形状の反射板と前記点光源である
ライトチューブとの相対位置を調整し、光フアイバーブ
ロック矩形側端面入射光を光フアイバーシート重畳方向
に対して端側を高く、中央側を低い光量分布にすること
により、液晶シャッタアレイ入射光の光量分布を長手方
向に対して中央で低く端側はど高（することができ、前
記長尺液晶シャッタアレイの、長手方向に対して中央部
で光透過率が高く両端に行くほど光透過率が低くなる光
量過率分布特性を補い、結果として出射光景分布が均一
な液晶シャッタアレイヘッドにすることができる０例え
ば、電子写真式プリンタ等の露光用ヘッドとして使用し
た場合、感光体への露光量が長手方向に対して均一とな
るため、高品質の印字が可能となる。さらに従来技術で
は感光体長手方向で中央部はど露光量が太き（なり中央
部はど早く劣化される傾向が減少するため、感光体の長
寿命化が図れ、ラレニングコストの低減された電子写真
式プリンタを提供することができるという効果を有する
。As described above, according to the present invention, the relative position between the hemispherical reflecting plate of the light source unit that converts a point light source into a surface light source and the light tube that is the point light source is adjusted, and the rectangular side end face of the optical fiber block is adjusted. By making the incident light have a high light intensity distribution on the end side and a low light intensity distribution on the center side with respect to the optical fiber sheet superimposition direction, the light intensity distribution of the incident light on the liquid crystal shutter array can be made low in the center and high on the end side ( It is possible to compensate for the light intensity distribution characteristic of the elongated liquid crystal shutter array, in which the light transmittance is high in the central part in the longitudinal direction and the light transmittance decreases toward both ends, and as a result, the output scene distribution is improved. For example, when used as an exposure head for an electrophotographic printer, the amount of exposure to the photoreceptor is uniform in the longitudinal direction, resulting in high-quality printing. In addition, in the conventional technology, the exposure amount is larger at the center in the longitudinal direction of the photoreceptor (this reduces the tendency for the center to deteriorate quickly, which makes it possible to extend the life of the photoreceptor and reduce the running cost. This has the advantage that it is possible to provide an electrophotographic printer with a reduced amount of energy.
第１図は本発明の実施例における原理構成図。
第２図は本発明の実施例における分解斜視図。第３図は
本発明のファイバーブロック部矩形結束端面への入射光
量分布図。第４図は本発明の液晶シャッタアレイへの入
射光量分布図、第５図は本発明の液晶シャッタアレイヘ
ッドの所定焦点距離における光量分布図。第６図は液晶
シャッタアレイの光量透過率分布図。
ｌは光源部、１ａは点光源であるハロゲンチューブ、１
ｂは反射板、２は光フアイバーブロック、３はハーフミ
ラ−１４はＮＤフィルター、５は冷却ファン、６はＲ面
ミラー、７は液晶シャックアレイ、８はセルフオフレン
ズアレイ、９は感光体ドラム。
以 上
出願人 セイコーエプソン株式会社
代理人 弁理士 最 上 務（他１名）プデイｌぐ−
プロ１ンク炬杼多イＶす、’ｓ砧４第３図
第４図FIG. 1 is a diagram showing the principle configuration of an embodiment of the present invention. FIG. 2 is an exploded perspective view of an embodiment of the invention. FIG. 3 is a distribution diagram of the amount of light incident on the rectangular bundled end face of the fiber block portion of the present invention. FIG. 4 is a distribution diagram of the amount of light incident on the liquid crystal shutter array of the present invention, and FIG. 5 is a distribution diagram of the amount of light at a predetermined focal length of the liquid crystal shutter array head of the present invention. FIG. 6 is a light transmittance distribution diagram of the liquid crystal shutter array. l is a light source part, 1a is a halogen tube which is a point light source, 1
b is a reflection plate, 2 is an optical fiber block, 3 is a half mirror, 14 is an ND filter, 5 is a cooling fan, 6 is an R-plane mirror, 7 is a liquid crystal shack array, 8 is a self-off lens array, and 9 is a photosensitive drum. Applicant Seiko Epson Co., Ltd. Agent Patent Attorney Tsumugi Mogami (and one other person)
Professional 1 rank Koshuta Vsu,'s Kinuta 4 Figure 3 Figure 4
Claims (1)
し、他端をライン状に並べたファイバーブロックと、ラ
イン状にシャッタを配列し選択的に開閉駆動される液晶
シャッタアレイから構成される液晶シャッタアレイヘッ
ドに於いて、長尺状の液晶シャッタアレイの光透過率分
布を光源部の光量分布により補整することを特徴とする
液晶シャッタアレイヘッド。Consists of a light source unit that converts a point light source into a surface light source, a fiber block with one end tied into a rectangle and the other end lined up in a line, and a liquid crystal shutter array with shutters arranged in a line and driven to open and close selectively. 1. A liquid crystal shutter array head comprising: a liquid crystal shutter array head in which a light transmittance distribution of a long liquid crystal shutter array is corrected by a light amount distribution of a light source section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62272187A JPH01114465A (en) | 1987-10-28 | 1987-10-28 | Liquid crystal shutter array head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62272187A JPH01114465A (en) | 1987-10-28 | 1987-10-28 | Liquid crystal shutter array head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01114465A true JPH01114465A (en) | 1989-05-08 |
Family
ID=17510299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62272187A Pending JPH01114465A (en) | 1987-10-28 | 1987-10-28 | Liquid crystal shutter array head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01114465A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4405106A1 (en) * | 1993-02-17 | 1994-08-18 | Honda Motor Co Ltd | Anchoring for a seat belt |
| US7145589B2 (en) * | 2002-07-12 | 2006-12-05 | Ricoh Company, Ltd. | Light scanning apparatus having a liquid crystal deflector and image forming apparatus using the same |
-
1987
- 1987-10-28 JP JP62272187A patent/JPH01114465A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4405106A1 (en) * | 1993-02-17 | 1994-08-18 | Honda Motor Co Ltd | Anchoring for a seat belt |
| US5464252A (en) * | 1993-02-17 | 1995-11-07 | Honda Giken Kogyo Kabushiki Kaisha | Anchor device for seat belt |
| US7145589B2 (en) * | 2002-07-12 | 2006-12-05 | Ricoh Company, Ltd. | Light scanning apparatus having a liquid crystal deflector and image forming apparatus using the same |
| US7505060B2 (en) | 2002-07-12 | 2009-03-17 | Ricoh Company, Ltd. | Light scanning apparatus having a liquid crystal deflector and image forming apparatus using the same |
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