JPS54147006A - Optical recorder-reproducer - Google Patents

Optical recorder-reproducer

Info

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
Application number
JP5591278A
Other languages
Japanese (ja)
Other versions
JPH0253854B2 (en
Inventor
Hideo Okamura
Shunji Kanamaru
Akira Ichinose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP5591278A priority Critical patent/JPS54147006A/en
Publication of JPS54147006A publication Critical patent/JPS54147006A/en
Publication of JPH0253854B2 publication Critical patent/JPH0253854B2/ja
Granted legal-status Critical Current

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
JP5591278A 1978-05-10 1978-05-10 Optical recorder-reproducer Granted JPS54147006A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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