JPS57150148A - Optical type recorder and reproducer - Google Patents

Optical type recorder and reproducer

Info

Publication number
JPS57150148A
JPS57150148A JP3495981A JP3495981A JPS57150148A JP S57150148 A JPS57150148 A JP S57150148A JP 3495981 A JP3495981 A JP 3495981A JP 3495981 A JP3495981 A JP 3495981A JP S57150148 A JPS57150148 A JP S57150148A
Authority
JP
Japan
Prior art keywords
circuit
recording
focus control
recording disc
converging
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
JP3495981A
Other languages
Japanese (ja)
Other versions
JPH0470697B2 (en
Inventor
Mitsuro Moriya
Masahiro Deguchi
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 JP3495981A priority Critical patent/JPS57150148A/en
Publication of JPS57150148A publication Critical patent/JPS57150148A/en
Publication of JPH0470697B2 publication Critical patent/JPH0470697B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0945—Methods for initialising servos, start-up sequences

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To prevent the collision between a converging optical system and a recording disc and to give focus control on a recording surface surely, by giving a signal for braking to a driving element when a converging point of a light beam comes around a surface having information signals on a recording disc. CONSTITUTION:A reflected light of a beam converged on a recording surface of a recording disc 1 irradiates a 4-split photodetector 13, two portions of outputs are inputted to a differential amplifier 16 via synthesis circuits 14 and 15, and the outputs drive a converging lens driving element 21 via a compensation circuit 17, a gain converting circuit 18, a switch 19, and a driving circuit 20. If focus control is inoperative, a signal is given to a counter circuit 25 and an AND circuit 31 from an instruction generating circuit 26, and the counter circuit 25 counts 1 when the optical beam approaches the protective layer and the recording layer, and a comparison circuit 27 compares it with the 2 of a numeral setting circuit 28. If they are coincident, a switch circuit 19 is made inoperative via an AND circuit 31, and a brake signal from a brake signal generating circuit 33 is given to a driving circuit 20 to prevent the collision between a converging lens 9 and the recording disc 1 and perform the focus control on the recording film.
JP3495981A 1981-03-10 1981-03-10 Optical type recorder and reproducer Granted JPS57150148A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3495981A JPS57150148A (en) 1981-03-10 1981-03-10 Optical type recorder and reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3495981A JPS57150148A (en) 1981-03-10 1981-03-10 Optical type recorder and reproducer

Publications (2)

Publication Number Publication Date
JPS57150148A true JPS57150148A (en) 1982-09-16
JPH0470697B2 JPH0470697B2 (en) 1992-11-11

Family

ID=12428680

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3495981A Granted JPS57150148A (en) 1981-03-10 1981-03-10 Optical type recorder and reproducer

Country Status (1)

Country Link
JP (1) JPS57150148A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60251529A (en) * 1984-05-25 1985-12-12 Sony Corp Optical disk player
JPS63129525A (en) * 1986-11-19 1988-06-01 Matsushita Graphic Commun Syst Inc Focus servo device for optical disk device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5538639A (en) * 1978-09-07 1980-03-18 Pioneer Video Corp Servo drawing-in unit for focus lens of optical information reader

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5538639A (en) * 1978-09-07 1980-03-18 Pioneer Video Corp Servo drawing-in unit for focus lens of optical information reader

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60251529A (en) * 1984-05-25 1985-12-12 Sony Corp Optical disk player
JPH0473219B2 (en) * 1984-05-25 1992-11-20 Sony Corp
JPS63129525A (en) * 1986-11-19 1988-06-01 Matsushita Graphic Commun Syst Inc Focus servo device for optical disk device

Also Published As

Publication number Publication date
JPH0470697B2 (en) 1992-11-11

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