JPS56130370A - Stabilization of modulated output of laser printer - Google Patents
Stabilization of modulated output of laser printerInfo
- Publication number
- JPS56130370A JPS56130370A JP3425480A JP3425480A JPS56130370A JP S56130370 A JPS56130370 A JP S56130370A JP 3425480 A JP3425480 A JP 3425480A JP 3425480 A JP3425480 A JP 3425480A JP S56130370 A JPS56130370 A JP S56130370A
- Authority
- JP
- Japan
- Prior art keywords
- output
- laser
- semiconductor laser
- manner
- stabilization
- 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
Landscapes
- Semiconductor Lasers (AREA)
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
Abstract
PURPOSE: To prevent variations in the output of a semiconductor laser due to changes in the characteristics of the laser by driving the semiconductor laser in such a manner as to eliminate difference between the output and a modulated signal after it is photoelectrically converted with a photodetector and the resultant electrical signal is amplified.
CONSTITUTION: The output of a semiconductor laser 1 is detected with a light detecting device 103 (photo diode or the like) converted into an electrical signal which is amplified with an operation amplifier and outputted. The output is applied to an inversion input terminal of a comparator 100 via an inverter 101 to drive a semiconductor laser 1 in such a manner that it equals a modulated signal to be applied to a noninversion input terminal. If an output of D is to be obtained with an input current of C, any change in the characteristics of the laser, for example, from D1' to D2', can be detected with the light detecting device 103 to vary the input current of the laser 1 to C' with the comparator 100. In this manner, the laser is maintained to provide the output D constantly.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3425480A JPS56130370A (en) | 1980-03-18 | 1980-03-18 | Stabilization of modulated output of laser printer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3425480A JPS56130370A (en) | 1980-03-18 | 1980-03-18 | Stabilization of modulated output of laser printer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56130370A true JPS56130370A (en) | 1981-10-13 |
Family
ID=12409030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3425480A Pending JPS56130370A (en) | 1980-03-18 | 1980-03-18 | Stabilization of modulated output of laser printer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56130370A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0878882A2 (en) * | 1997-05-12 | 1998-11-18 | AT&T Corp. | Current control for an analog optical link |
-
1980
- 1980-03-18 JP JP3425480A patent/JPS56130370A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0878882A2 (en) * | 1997-05-12 | 1998-11-18 | AT&T Corp. | Current control for an analog optical link |
EP0878882A3 (en) * | 1997-05-12 | 1998-12-09 | AT&T Corp. | Current control for an analog optical link |
US5963570A (en) * | 1997-05-12 | 1999-10-05 | At&T Corp. | Current control for an analog optical link |
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