JPS6476432A - Optical information recording and reproducing device - Google Patents
Optical information recording and reproducing deviceInfo
- Publication number
- JPS6476432A JPS6476432A JP62233459A JP23345987A JPS6476432A JP S6476432 A JPS6476432 A JP S6476432A JP 62233459 A JP62233459 A JP 62233459A JP 23345987 A JP23345987 A JP 23345987A JP S6476432 A JPS6476432 A JP S6476432A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- generated
- high frequency
- circuit
- generation
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title 1
- 239000004065 semiconductor Substances 0.000 abstract 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 230000006378 damage Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
PURPOSE:To prevent the destruction of a semiconductor laser and to prevent the degradation of S/N by providing a timing circuit which switches a laser driving circuit at a prescribed time after the switching operation of a high frequency superposing circuit. CONSTITUTION:A signal (b) and a signal (e) are generated from a timing circuit 17 and a timing circuit 14 only for prescribed times respectively in accordance with the trailing edge of a sector signal (a) and are generated at a prescribed time after the sector signal (a). A control signal C is generated from a control signal gate circuit 18 in accordance with this generation to stop a high frequency superposing signal (d) and the generation of this signal is started simultaneously with the leading edge of the control signal C and meanwhile, a signal (f) is generated from a write gate circuit 15 to perform recording. By this constitution, the generation of the high frequency is so suppressed that the margin of time for stable oscillation and stop of the high frequency exists on the boundary between high output light emission and low output light emission of a semiconductor laser 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62233459A JP2591759B2 (en) | 1987-09-17 | 1987-09-17 | Optical information recording / reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62233459A JP2591759B2 (en) | 1987-09-17 | 1987-09-17 | Optical information recording / reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6476432A true JPS6476432A (en) | 1989-03-22 |
| JP2591759B2 JP2591759B2 (en) | 1997-03-19 |
Family
ID=16955363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62233459A Expired - Lifetime JP2591759B2 (en) | 1987-09-17 | 1987-09-17 | Optical information recording / reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2591759B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH038130A (en) * | 1989-06-05 | 1991-01-16 | Matsushita Electric Ind Co Ltd | Optical data storing and reproducing device |
| JPH056565A (en) * | 1991-06-28 | 1993-01-14 | Nec Corp | Optical recording and reproducing device |
-
1987
- 1987-09-17 JP JP62233459A patent/JP2591759B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH038130A (en) * | 1989-06-05 | 1991-01-16 | Matsushita Electric Ind Co Ltd | Optical data storing and reproducing device |
| JPH056565A (en) * | 1991-06-28 | 1993-01-14 | Nec Corp | Optical recording and reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2591759B2 (en) | 1997-03-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071219 Year of fee payment: 11 |