JPS57167142A - Optical recording and reproducing device - Google Patents

Optical recording and reproducing device

Info

Publication number
JPS57167142A
JPS57167142A JP5348281A JP5348281A JPS57167142A JP S57167142 A JPS57167142 A JP S57167142A JP 5348281 A JP5348281 A JP 5348281A JP 5348281 A JP5348281 A JP 5348281A JP S57167142 A JPS57167142 A JP S57167142A
Authority
JP
Japan
Prior art keywords
disc
optical recording
reproducing device
sent
level
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
Application number
JP5348281A
Other languages
Japanese (ja)
Inventor
Kazuo Hirasawa
Takahiro Kubo
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP5348281A priority Critical patent/JPS57167142A/en
Publication of JPS57167142A publication Critical patent/JPS57167142A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To prevent a double write, by confirming whether the reproducing signal from a disc exists or not when data is to be written on the disc surface where data is already recorded. CONSTITUTION:A reproducing signal 11 is sent to not only a reproducing processing system 12 but also a level detector 14 and has the level of the amplitude detected. If the part, which is irradiated by a laser beam 6, of a disc 8 has a certain level or more, a control output 16 is sent to a mode switching part 3 by a mode switching control part 15, and a warning signal 19 is outputted.
JP5348281A 1981-04-09 1981-04-09 Optical recording and reproducing device Pending JPS57167142A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5348281A JPS57167142A (en) 1981-04-09 1981-04-09 Optical recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5348281A JPS57167142A (en) 1981-04-09 1981-04-09 Optical recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS57167142A true JPS57167142A (en) 1982-10-14

Family

ID=12944053

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5348281A Pending JPS57167142A (en) 1981-04-09 1981-04-09 Optical recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS57167142A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158038A (en) * 1982-03-15 1983-09-20 Toshiba Corp Optical disc device
EP0182127A2 (en) * 1984-11-19 1986-05-28 International Business Machines Corporation System for preventing the overwriting of previously optically recorded data and for reading optically recorded data during writing
EP0184195A2 (en) * 1984-12-06 1986-06-11 Hitachi, Ltd. Optical disc recording apparatus
JPS61139984A (en) * 1984-12-11 1986-06-27 Nippon Columbia Co Ltd Optical disk device
JPS62252565A (en) * 1986-04-25 1987-11-04 Teac Co Double recording preventing method for information recording media
US4819093A (en) * 1984-10-02 1989-04-04 Fuji Photo Film Co., Ltd. Rotary magnetic recording-reproducing apparatus with disc track checking
US6061090A (en) * 1985-10-30 2000-05-09 Canon Kabushiki Kaisha Recording and/or reproducing apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54147006A (en) * 1978-05-10 1979-11-16 Matsushita Electric Ind Co Ltd Optical recorder-reproducer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54147006A (en) * 1978-05-10 1979-11-16 Matsushita Electric Ind Co Ltd Optical recorder-reproducer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58158038A (en) * 1982-03-15 1983-09-20 Toshiba Corp Optical disc device
EP0089021A2 (en) * 1982-03-15 1983-09-21 Kabushiki Kaisha Toshiba Overlay recording prevention device for optical disc apparatus
JPH041409B2 (en) * 1982-03-15 1992-01-13 Tokyo Shibaura Electric Co
US4819093A (en) * 1984-10-02 1989-04-04 Fuji Photo Film Co., Ltd. Rotary magnetic recording-reproducing apparatus with disc track checking
EP0182127A2 (en) * 1984-11-19 1986-05-28 International Business Machines Corporation System for preventing the overwriting of previously optically recorded data and for reading optically recorded data during writing
EP0184195A2 (en) * 1984-12-06 1986-06-11 Hitachi, Ltd. Optical disc recording apparatus
JPS61139984A (en) * 1984-12-11 1986-06-27 Nippon Columbia Co Ltd Optical disk device
US6061090A (en) * 1985-10-30 2000-05-09 Canon Kabushiki Kaisha Recording and/or reproducing apparatus
JPS62252565A (en) * 1986-04-25 1987-11-04 Teac Co Double recording preventing method for information recording media
JPH054746B2 (en) * 1986-04-25 1993-01-20 Teac Corp

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