JPH0470697B2 - - Google Patents

Info

Publication number
JPH0470697B2
JPH0470697B2 JP56034959A JP3495981A JPH0470697B2 JP H0470697 B2 JPH0470697 B2 JP H0470697B2 JP 56034959 A JP56034959 A JP 56034959A JP 3495981 A JP3495981 A JP 3495981A JP H0470697 B2 JPH0470697 B2 JP H0470697B2
Authority
JP
Japan
Prior art keywords
signal
focus control
circuit
light beam
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.)
Expired - Lifetime
Application number
JP56034959A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57150148A (en
Inventor
Mitsuro Morya
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/ja
Publication of JPS57150148A publication Critical patent/JPS57150148A/ja
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)
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 JPS57150148A (en) 1982-09-16
JPH0470697B2 true 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])

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60251529A (ja) * 1984-05-25 1985-12-12 Sony Corp 光学式ディスク・プレーヤ
JPH0664744B2 (ja) * 1986-11-19 1994-08-22 松下電送株式会社 光デイスク装置のフオ−カスサ−ボ装置

Family Cites Families (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

Also Published As

Publication number Publication date
JPS57150148A (en) 1982-09-16

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