JPS62116570U - - Google Patents
Info
- Publication number
- JPS62116570U JPS62116570U JP467686U JP467686U JPS62116570U JP S62116570 U JPS62116570 U JP S62116570U JP 467686 U JP467686 U JP 467686U JP 467686 U JP467686 U JP 467686U JP S62116570 U JPS62116570 U JP S62116570U
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- intensity
- emission intensity
- light receiving
- receiving element
- 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
- 239000004065 semiconductor Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Laser Beam Printer (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
Description
第１図はこの考案の一実施例を示すブロツク構
成図、第２図は第１図のＣＰＵ３０が実行するプ
ログラムのフロー図、第３図は第２図の比較ルー
チンのプログラムを示すフロー図、第４図は第２
図の加算ルーチンのプログラムを示すフロー図、
第５図は第２図の減算ルーチンのプログラムを示
すフロー図、第６図は第１図の動作説明に供する
タイミング図である。
１……コントロールユニツト、２……制御部、
３……強度変調用制御部、４，８……比較器、５
，７……Ｄ／Ａ変換器、６……バツフア、９……
外部機器、１０……キーボード、３０……中央処
理装置（ＣＰＵ）、３１……プログラムメモリ（
ＲＯＭ）、３２……データメモリ（ＲＡＭ）、３
３……入出力装置（Ｉ／Ｏ）、ＶＲ……可変抵抗
、Ｒ……抵抗、Ｔｒ１，Ｔｒ２……トランジスタ
、ＬＤ……半導体レーザ、ＰＤ……ピンフオトダ
イオード（受光素子）。
FIG. 1 is a block configuration diagram showing an embodiment of this invention, FIG. 2 is a flow diagram of a program executed by the CPU 30 of FIG. 1, and FIG. 3 is a flow diagram of a program of the comparison routine of FIG. 2. Figure 4 is the second
A flow diagram showing the program of the addition routine in Figure,
FIG. 5 is a flowchart showing a program of the subtraction routine of FIG. 2, and FIG. 6 is a timing diagram for explaining the operation of FIG. 1... Control unit, 2... Control section,
3... Intensity modulation control unit, 4, 8... Comparator, 5
, 7... D/A converter, 6... buffer, 9...
External equipment, 10...Keyboard, 30...Central processing unit (CPU), 31...Program memory (
ROM), 32...Data memory (RAM), 3
3...Input/output device (I/O), VR...variable resistor, R...resistor, Tr1 , Tr2 ...transistor, LD...semiconductor laser, PD...pin photodiode (light receiving element).
Claims (1)
部を受光素子によつて受光することによりその発
光強度を検出すると共に、その検出発光強度を利
用して前記半導体レーザの駆動電流を強度変調す
るようにした半導体レーザの強度変調装置におい
て、 前記受光素子に流れる前記半導体レーザの発光
強度を示すモニタ電流を電圧に変換する抵抗を可
変抵抗としたことを特徴とする半導体レーザの強
度変調装置。[Claims for Utility Model Registration] Part of the laser beam output from a semiconductor laser is received by a light receiving element to detect its emission intensity, and the detected emission intensity is used to drive the semiconductor laser. A semiconductor laser intensity modulation device for intensity modulating a current, characterized in that a resistor for converting a monitor current indicating the emission intensity of the semiconductor laser flowing through the light receiving element into a voltage is a variable resistor. Intensity modulator.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP467686U JPS62116570U (en) | 1986-01-16 | 1986-01-16 | |
| US06/924,879 US4727382A (en) | 1985-11-15 | 1986-10-30 | Intensity control for a semiconductor laser of a laser beam printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP467686U JPS62116570U (en) | 1986-01-16 | 1986-01-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62116570U true JPS62116570U (en) | 1987-07-24 |
Family
ID=30785556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP467686U Pending JPS62116570U (en) | 1985-11-15 | 1986-01-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62116570U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55130190A (en) * | 1979-03-26 | 1980-10-08 | Bosch Gmbh Robert | Limiting circuit for semiconductor laser |
| JPS58212256A (en) * | 1982-06-03 | 1983-12-09 | Hitachi Ltd | Laser light source device |
-
1986
- 1986-01-16 JP JP467686U patent/JPS62116570U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55130190A (en) * | 1979-03-26 | 1980-10-08 | Bosch Gmbh Robert | Limiting circuit for semiconductor laser |
| JPS58212256A (en) * | 1982-06-03 | 1983-12-09 | Hitachi Ltd | Laser light source device |
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