JPH0370860B2 - - Google Patents

Info

Publication number
JPH0370860B2
JPH0370860B2 JP12189682A JP12189682A JPH0370860B2 JP H0370860 B2 JPH0370860 B2 JP H0370860B2 JP 12189682 A JP12189682 A JP 12189682A JP 12189682 A JP12189682 A JP 12189682A JP H0370860 B2 JPH0370860 B2 JP H0370860B2
Authority
JP
Japan
Prior art keywords
envelope
output
signal
focus
detection means
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
Application number
JP12189682A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5911542A (ja
Inventor
Noboru Wakami
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 JP12189682A priority Critical patent/JPS5911542A/ja
Publication of JPS5911542A publication Critical patent/JPS5911542A/ja
Publication of JPH0370860B2 publication Critical patent/JPH0370860B2/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
    • G11B7/0908—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 for focusing only

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP12189682A 1982-07-12 1982-07-12 光学記録再生装置 Granted JPS5911542A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12189682A JPS5911542A (ja) 1982-07-12 1982-07-12 光学記録再生装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12189682A JPS5911542A (ja) 1982-07-12 1982-07-12 光学記録再生装置

Publications (2)

Publication Number Publication Date
JPS5911542A JPS5911542A (ja) 1984-01-21
JPH0370860B2 true JPH0370860B2 (fr) 1991-11-11

Family

ID=14822584

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12189682A Granted JPS5911542A (ja) 1982-07-12 1982-07-12 光学記録再生装置

Country Status (1)

Country Link
JP (1) JPS5911542A (fr)

Also Published As

Publication number Publication date
JPS5911542A (ja) 1984-01-21

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