JPS5567947A - Focus error detector - Google Patents

Focus error detector

Info

Publication number
JPS5567947A
JPS5567947A JP14114978A JP14114978A JPS5567947A JP S5567947 A JPS5567947 A JP S5567947A JP 14114978 A JP14114978 A JP 14114978A JP 14114978 A JP14114978 A JP 14114978A JP S5567947 A JPS5567947 A JP S5567947A
Authority
JP
Japan
Prior art keywords
laser light
photo
focus
error
light source
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
JP14114978A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6136295B2 (enrdf_load_stackoverflow
Inventor
Toru Fujishima
Masanori Ogino
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14114978A priority Critical patent/JPS5567947A/ja
Publication of JPS5567947A publication Critical patent/JPS5567947A/ja
Publication of JPS6136295B2 publication Critical patent/JPS6136295B2/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)
JP14114978A 1978-11-17 1978-11-17 Focus error detector Granted JPS5567947A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14114978A JPS5567947A (en) 1978-11-17 1978-11-17 Focus error detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14114978A JPS5567947A (en) 1978-11-17 1978-11-17 Focus error detector

Publications (2)

Publication Number Publication Date
JPS5567947A true JPS5567947A (en) 1980-05-22
JPS6136295B2 JPS6136295B2 (enrdf_load_stackoverflow) 1986-08-18

Family

ID=15285279

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14114978A Granted JPS5567947A (en) 1978-11-17 1978-11-17 Focus error detector

Country Status (1)

Country Link
JP (1) JPS5567947A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
JPS6136295B2 (enrdf_load_stackoverflow) 1986-08-18

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