JPH0582656B2 - - Google Patents

Info

Publication number
JPH0582656B2
JPH0582656B2 JP59219716A JP21971684A JPH0582656B2 JP H0582656 B2 JPH0582656 B2 JP H0582656B2 JP 59219716 A JP59219716 A JP 59219716A JP 21971684 A JP21971684 A JP 21971684A JP H0582656 B2 JPH0582656 B2 JP H0582656B2
Authority
JP
Japan
Prior art keywords
information
signal
focus
focus state
information recording
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
JP59219716A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6199943A (ja
Inventor
Shinichi Tanaka
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 JP59219716A priority Critical patent/JPS6199943A/ja
Publication of JPS6199943A publication Critical patent/JPS6199943A/ja
Publication of JPH0582656B2 publication Critical patent/JPH0582656B2/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

  • Testing Of Optical Devices Or Fibers (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)
JP59219716A 1984-10-18 1984-10-18 焦点状態検査装置 Granted JPS6199943A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59219716A JPS6199943A (ja) 1984-10-18 1984-10-18 焦点状態検査装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59219716A JPS6199943A (ja) 1984-10-18 1984-10-18 焦点状態検査装置

Publications (2)

Publication Number Publication Date
JPS6199943A JPS6199943A (ja) 1986-05-19
JPH0582656B2 true JPH0582656B2 (enrdf_load_stackoverflow) 1993-11-19

Family

ID=16739848

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59219716A Granted JPS6199943A (ja) 1984-10-18 1984-10-18 焦点状態検査装置

Country Status (1)

Country Link
JP (1) JPS6199943A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
JPS6199943A (ja) 1986-05-19

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