JPH047148U - - Google Patents
Info
- Publication number
- JPH047148U JPH047148U JP4843490U JP4843490U JPH047148U JP H047148 U JPH047148 U JP H047148U JP 4843490 U JP4843490 U JP 4843490U JP 4843490 U JP4843490 U JP 4843490U JP H047148 U JPH047148 U JP H047148U
- Authority
- JP
- Japan
- Prior art keywords
- light
- emitting element
- element array
- light emitting
- circuit
- 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
- 238000003491 array Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Dot-Matrix Printers And Others (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
Description
第１図は、本考案に係る発光素子アレイの駆動
回路の一実施例を示すブロツク図、第２図は、第
１図のＬＥＤアレイの発光時間と露光量の関係を
示すグラフ、第３図は、第１図のワンシヨツトマ
ルチバイブレータ回路の出力パルス幅と抵抗値の
関係を示すグラフ、第４図は、第１図の駆動回路
が用いられる電子写真式プリンタの概略構成図、
第５図は、ＬＥＤ素子間の輝度のばらつきを示す
特性図、第６図は、ＬＥＤアレイ間の輝度のばら
つきを示す特性図、第７図は、従来の発光素子ア
レイの駆動回路を示すブロツク図である。
１０……ＬＥＤアレイ、１１……ＬＥＤ駆動Ｉ
Ｃドライバ、４０……ワンシヨツトマルチバイブ
レータ回路、４１……抵抗。
FIG. 1 is a block diagram showing one embodiment of a drive circuit for a light emitting element array according to the present invention, FIG. 2 is a graph showing the relationship between light emission time and exposure amount of the LED array shown in FIG. 1, and FIG. is a graph showing the relationship between the output pulse width and resistance value of the one-shot multivibrator circuit shown in FIG. 1; FIG. 4 is a schematic configuration diagram of an electrophotographic printer in which the drive circuit shown in FIG. 1 is used;
FIG. 5 is a characteristic diagram showing variations in brightness between LED elements, FIG. 6 is a characteristic diagram showing variations in brightness between LED arrays, and FIG. 7 is a block diagram showing a conventional drive circuit for a light emitting element array. It is a diagram. 10...LED array, 11...LED drive I
C driver, 40...one-shot multivibrator circuit, 41...resistor.
Claims (1)
光素子アレイ毎の輝度のばらつきに応じた値を複
数の抵抗と、 前記抵抗値により決定される幅のパルスをそれ
ぞれ出力する複数のワンシヨツトマルチバイブレ
ータ回路と、 前記発光素子アレイの発光時間を前記ワンシヨ
ツトマルチバイブレータ回路のパルス幅に応じて
制御する回路とを有する発光素子アレイの駆動回
路。 (2) 前記抵抗は、外付けされていることを特徴
とする請求項(1)記載の発光素子アレイの駆動回
路。[Claims for Utility Model Registration] (1) A plurality of resistors each having a value corresponding to variations in brightness among a plurality of light emitting element arrays each having a plurality of light emitting elements, and a pulse having a width determined by the resistance value, respectively. A drive circuit for a light-emitting element array, comprising: a plurality of one-shot multivibrator circuits for outputting light; and a circuit for controlling a light emission time of the light-emitting element array according to a pulse width of the one-shot multivibrator circuit. (2) The drive circuit for a light emitting element array according to claim (1), wherein the resistor is externally attached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4843490U JPH047148U (en) | 1990-05-09 | 1990-05-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4843490U JPH047148U (en) | 1990-05-09 | 1990-05-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH047148U true JPH047148U (en) | 1992-01-22 |
Family
ID=31565238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4843490U Pending JPH047148U (en) | 1990-05-09 | 1990-05-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH047148U (en) |
-
1990
- 1990-05-09 JP JP4843490U patent/JPH047148U/ja active Pending
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