JPS54147006A - Optical recorder-reproducer - Google Patents
Optical recorder-reproducerInfo
- Publication number
- JPS54147006A JPS54147006A JP5591278A JP5591278A JPS54147006A JP S54147006 A JPS54147006 A JP S54147006A JP 5591278 A JP5591278 A JP 5591278A JP 5591278 A JP5591278 A JP 5591278A JP S54147006 A JPS54147006 A JP S54147006A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- reproduction signal
- gate
- disc
- detected
- 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 occurrence of double recording by detecting the light transmitting through or reflecting from a disc and controlling a recording gate circuit depending upon the presence or not of reproduction signal.
CONSTITUTION: A disc 15 is radiated by the laser light from a laser 1 and the transmitted light is detected with photoelectric detectors 8a, 8b. The voltage corresponding to the reproduction signal is detected through an amplifier 101 and LPF 102 and is then compared with a reference voltage in a comparator 103, whereby the presence or not of the reproduction signal is detected. In case there is the reproduction signal, and FF 105 is set by the output of the comparator 103 and an AND gate 106 is closed by the set output of the low level of the FF 105, thus the revolution detection signal generated at each one revolution of the disc 15 outputted by a revolution phase detector 15 is not applied to the gate circuit 21. Since the gate of the circuit 21 is not closed, the recording singal is not applied to a photo modulator 2 even if the recording switch of the circuit 21 is inadvertently turned ON. Hence, the occurrence of double recording is prevented.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5591278A JPS54147006A (en) | 1978-05-10 | 1978-05-10 | Optical recorder-reproducer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5591278A JPS54147006A (en) | 1978-05-10 | 1978-05-10 | Optical recorder-reproducer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54147006A true JPS54147006A (en) | 1979-11-16 |
JPH0253854B2 JPH0253854B2 (en) | 1990-11-20 |
Family
ID=13012317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5591278A Granted JPS54147006A (en) | 1978-05-10 | 1978-05-10 | Optical recorder-reproducer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54147006A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57167142A (en) * | 1981-04-09 | 1982-10-14 | Mitsubishi Electric Corp | Optical recording and reproducing device |
EP0089021A2 (en) * | 1982-03-15 | 1983-09-21 | Kabushiki Kaisha Toshiba | Overlay recording prevention device for optical disc apparatus |
US5042023A (en) * | 1988-09-30 | 1991-08-20 | Kabushiki Kaisha Toshiba | Apparatus and method for overwrite prevention |
US5126993A (en) * | 1988-09-30 | 1992-06-30 | Kabushiki Kaisha Toshiba | Optical data recording/reproducing apparatus including device for preventing erroneous light emission |
-
1978
- 1978-05-10 JP JP5591278A patent/JPS54147006A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57167142A (en) * | 1981-04-09 | 1982-10-14 | Mitsubishi Electric Corp | Optical recording and reproducing device |
EP0089021A2 (en) * | 1982-03-15 | 1983-09-21 | Kabushiki Kaisha Toshiba | Overlay recording prevention device for optical disc apparatus |
US5042023A (en) * | 1988-09-30 | 1991-08-20 | Kabushiki Kaisha Toshiba | Apparatus and method for overwrite prevention |
US5126993A (en) * | 1988-09-30 | 1992-06-30 | Kabushiki Kaisha Toshiba | Optical data recording/reproducing apparatus including device for preventing erroneous light emission |
Also Published As
Publication number | Publication date |
---|---|
JPH0253854B2 (en) | 1990-11-20 |
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