JPS5619528A - Optical recording and reproducing unit - Google Patents
Optical recording and reproducing unitInfo
- Publication number
- JPS5619528A JPS5619528A JP9521079A JP9521079A JPS5619528A JP S5619528 A JPS5619528 A JP S5619528A JP 9521079 A JP9521079 A JP 9521079A JP 9521079 A JP9521079 A JP 9521079A JP S5619528 A JPS5619528 A JP S5619528A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- recording
- disc
- light
- reproduced
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
PURPOSE: To prevent the track formed newly on the disc from being crossed or laminated on the track formed with recording in advance, by automatical control the recording light source and the driving unit for the light source according to the signal reproduced from the disc.
CONSTITUTION: The light L from the semiconductor laser 101 of the recording and reproduction optical unit 10 is focussed into a fine diameter, radiated on the optical recording disc 11, recorded and reproduced, and the light power of the light source is set for the power at signal reproduction and signal recording, the power at reproduction is irradiated in advance to the signal recording section of the disc 11, the reflection light of disc is detected at the photodetector 105 to detect the presence of the envelope of the reproducing signal, and if the reproduced light is in crossing with the track pre recorded or is abnormally close to it, the envelope signal is output according to the part, and control is made at the semiconductor laser driving circuit 20 based on the envelope signal.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9521079A JPS5619528A (en) | 1979-07-25 | 1979-07-25 | Optical recording and reproducing unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9521079A JPS5619528A (en) | 1979-07-25 | 1979-07-25 | Optical recording and reproducing unit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5619528A true JPS5619528A (en) | 1981-02-24 |
JPS6136293B2 JPS6136293B2 (en) | 1986-08-18 |
Family
ID=14131379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9521079A Granted JPS5619528A (en) | 1979-07-25 | 1979-07-25 | Optical recording and reproducing unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5619528A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0457033U (en) * | 1990-09-18 | 1992-05-15 |
-
1979
- 1979-07-25 JP JP9521079A patent/JPS5619528A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0457033U (en) * | 1990-09-18 | 1992-05-15 |
Also Published As
Publication number | Publication date |
---|---|
JPS6136293B2 (en) | 1986-08-18 |
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