JPS54107311A - Fluctuation compensator of reproduction envelope signal in optical recorder-reproducer - Google Patents
Fluctuation compensator of reproduction envelope signal in optical recorder-reproducerInfo
- Publication number
- JPS54107311A JPS54107311A JP1456278A JP1456278A JPS54107311A JP S54107311 A JPS54107311 A JP S54107311A JP 1456278 A JP1456278 A JP 1456278A JP 1456278 A JP1456278 A JP 1456278A JP S54107311 A JPS54107311 A JP S54107311A
- Authority
- JP
- Japan
- Prior art keywords
- output
- envelope
- reproduction signal
- reproduction
- light
- 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 enable the amplitudes of reproduction signal to be maintained constant by adjusting the output power of a light source in correspondence to the fluctuations of reproduction envelope.
CONSTITUTION: Output light of a semiconductor laser 101 is condensed by a lens system 102 and is radiated as spot light on a disc 15 by passing through a tracking mirror 12 and objective lens 13. The transmitted light l3 having undergone modulation according to information is converted 17a, 17b to electric signals which are then added 18, whereby the reproduction signal is obtained at terminal A. And the envelope of the reproduction signal is detected in an integrating circuit 103. The time constant of this integration is obtained according to the speed changes of the envelope and the output thereof is supplied to a level comparator 104 and differetial amplifier 105. The differential signal output of the amplifier 105 controls the output of the laser 101 via the switch 106 which is controlled by the output of the comparator 104, a voltage adder 107 and current conversion circuit 108.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1456278A JPS54107311A (en) | 1978-02-09 | 1978-02-09 | Fluctuation compensator of reproduction envelope signal in optical recorder-reproducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1456278A JPS54107311A (en) | 1978-02-09 | 1978-02-09 | Fluctuation compensator of reproduction envelope signal in optical recorder-reproducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54107311A true JPS54107311A (en) | 1979-08-23 |
Family
ID=11864586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1456278A Pending JPS54107311A (en) | 1978-02-09 | 1978-02-09 | Fluctuation compensator of reproduction envelope signal in optical recorder-reproducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54107311A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60247836A (en) * | 1984-05-22 | 1985-12-07 | Nippon Gakki Seizo Kk | Optical information reproducing device |
| JPS61158048A (en) * | 1984-12-28 | 1986-07-17 | Olympus Optical Co Ltd | Recording information reader |
| JPS62217433A (en) * | 1986-03-19 | 1987-09-24 | Hitachi Ltd | Optical disk reproducing device |
| JPS6437745A (en) * | 1987-08-03 | 1989-02-08 | Brother Ind Ltd | Magneto-optical disk device |
-
1978
- 1978-02-09 JP JP1456278A patent/JPS54107311A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60247836A (en) * | 1984-05-22 | 1985-12-07 | Nippon Gakki Seizo Kk | Optical information reproducing device |
| JPS61158048A (en) * | 1984-12-28 | 1986-07-17 | Olympus Optical Co Ltd | Recording information reader |
| JPS62217433A (en) * | 1986-03-19 | 1987-09-24 | Hitachi Ltd | Optical disk reproducing device |
| JPS6437745A (en) * | 1987-08-03 | 1989-02-08 | Brother Ind Ltd | Magneto-optical disk device |
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