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JPS6450245A - Optical disk recording and reproducing device - Google Patents

Optical disk recording and reproducing device

Info

Publication number
JPS6450245A
JPS6450245A JP20725187A JP20725187A JPS6450245A JP S6450245 A JPS6450245 A JP S6450245A JP 20725187 A JP20725187 A JP 20725187A JP 20725187 A JP20725187 A JP 20725187A JP S6450245 A JPS6450245 A JP S6450245A
Authority
JP
Japan
Prior art keywords
signal
time
hold
recording
detecting
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
JP20725187A
Other languages
Japanese (ja)
Inventor
Kazuo Yoshimura
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.)
Fujitsu General Ltd
Original Assignee
Fujitsu General 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 Fujitsu General Ltd filed Critical Fujitsu General Ltd
Priority to JP20725187A priority Critical patent/JPS6450245A/en
Publication of JPS6450245A publication Critical patent/JPS6450245A/en
Pending legal-status Critical Current

Links

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  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To stably perform tracking control at the time of recording, by sampling the detecting signal of a reflecting sub laser beam at a time other than the time of projecting a recording power and the time when sub laser reflecting light is affected by a recording pit, and holding the value in the above periods. CONSTITUTION:A control circuit 11 samples the detecting signal of a photodetector 10b obtained by an amplifier 11a and similarly, samples the detecting signal of a photodetector 10c, and is provided with first and second hold circuits 11e and 11f, and a sample and hold signal generating means 11g to output a timing signal for holding. The detecting signals sampled-and-hold at the hold circuits 11e and 11f are inputted to a differential amplifier 11c, and a differential computing processing is applied, and an obtained tracking error signal receives a prescribed signal at a phase compensation circuit 11d, then, is outputted from the control circuit 11. In such a way, it is possible to perform the tracking control normally.
JP20725187A 1987-08-20 1987-08-20 Optical disk recording and reproducing device Pending JPS6450245A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20725187A JPS6450245A (en) 1987-08-20 1987-08-20 Optical disk recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20725187A JPS6450245A (en) 1987-08-20 1987-08-20 Optical disk recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS6450245A true JPS6450245A (en) 1989-02-27

Family

ID=16536712

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20725187A Pending JPS6450245A (en) 1987-08-20 1987-08-20 Optical disk recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS6450245A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06259789A (en) * 1992-03-31 1994-09-16 Nippon Columbia Co Ltd Optical recording and reproducing device
US5519679A (en) * 1994-10-12 1996-05-21 Eastman Kodak Company Apparatus and method for multi-spot sampled tracking in an optical data storage system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59195333A (en) * 1983-04-21 1984-11-06 Mitsubishi Electric Corp Track shift detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59195333A (en) * 1983-04-21 1984-11-06 Mitsubishi Electric Corp Track shift detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06259789A (en) * 1992-03-31 1994-09-16 Nippon Columbia Co Ltd Optical recording and reproducing device
US5519679A (en) * 1994-10-12 1996-05-21 Eastman Kodak Company Apparatus and method for multi-spot sampled tracking in an optical data storage system

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