JPS644930A - Semiconductor laser driving circuit for optical disk device - Google Patents
Semiconductor laser driving circuit for optical disk deviceInfo
- Publication number
- JPS644930A JPS644930A JP62160135A JP16013587A JPS644930A JP S644930 A JPS644930 A JP S644930A JP 62160135 A JP62160135 A JP 62160135A JP 16013587 A JP16013587 A JP 16013587A JP S644930 A JPS644930 A JP S644930A
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- light quantity
- optical disk
- circuit
- generated
- 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
- Optical Head (AREA)
Abstract
PURPOSE:To prevent the heat damage of a semiconductor laser and data destruction in an optical disk, etc., from being generated, by cutting off current supply to the semiconductor laser compulsorily when a light quantity detected at the light quantity detection circuit of the semiconductor laser decreases under an allowable lower limit. CONSTITUTION:The light quantity of laser light outputted from the semiconductor laser 6 is detected at the light quantity detection circuit 22, and is inputted to a feedback circuit. The feedback circuit controls the output current of a power source supply circuit 21 so that an inputted light quantity can be set at a regulated value. And when a certain kind of abnormality is generated and the light quantity outputted from the light quantity detection circuit 22 is decreased under the allowable lower limit, a control circuit 25 is operated, then, the output current of the current supply circuit 21 is cut off. In such a way, it is possible to prevent the heat damage of the semiconductor laser 6 and the data destruction in the optical disk from being generated even when the abnormality is generated in the light quantity detection circuit 22 of the semiconductor laser, and to improve the reliability the whole of an optical disk device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62160135A JPS644930A (en) | 1987-06-27 | 1987-06-27 | Semiconductor laser driving circuit for optical disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62160135A JPS644930A (en) | 1987-06-27 | 1987-06-27 | Semiconductor laser driving circuit for optical disk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS644930A true JPS644930A (en) | 1989-01-10 |
Family
ID=15708630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62160135A Pending JPS644930A (en) | 1987-06-27 | 1987-06-27 | Semiconductor laser driving circuit for optical disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS644930A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0294061A (en) * | 1988-09-30 | 1990-04-04 | Toshiba Corp | Optical output control device and information reproducing device |
-
1987
- 1987-06-27 JP JP62160135A patent/JPS644930A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0294061A (en) * | 1988-09-30 | 1990-04-04 | Toshiba Corp | Optical output control device and information reproducing device |
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