JPH0316693B2 - - Google Patents

Info

Publication number
JPH0316693B2
JPH0316693B2 JP56034825A JP3482581A JPH0316693B2 JP H0316693 B2 JPH0316693 B2 JP H0316693B2 JP 56034825 A JP56034825 A JP 56034825A JP 3482581 A JP3482581 A JP 3482581A JP H0316693 B2 JPH0316693 B2 JP H0316693B2
Authority
JP
Japan
Prior art keywords
reflectance
circuit
focus
laser beam
detection circuit
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
JP56034825A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57186238A (en
Inventor
Masahiro Higuchi
Kenji Torasawa
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP56034825A priority Critical patent/JPS57186238A/ja
Publication of JPS57186238A publication Critical patent/JPS57186238A/ja
Publication of JPH0316693B2 publication Critical patent/JPH0316693B2/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

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
JP56034825A 1981-03-10 1981-03-10 Focusing mechanism Granted JPS57186238A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56034825A JPS57186238A (en) 1981-03-10 1981-03-10 Focusing mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56034825A JPS57186238A (en) 1981-03-10 1981-03-10 Focusing mechanism

Publications (2)

Publication Number Publication Date
JPS57186238A JPS57186238A (en) 1982-11-16
JPH0316693B2 true JPH0316693B2 (OSRAM) 1991-03-06

Family

ID=12424970

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56034825A Granted JPS57186238A (en) 1981-03-10 1981-03-10 Focusing mechanism

Country Status (1)

Country Link
JP (1) JPS57186238A (OSRAM)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS632123A (ja) * 1986-06-20 1988-01-07 Sanyo Electric Co Ltd 光学式記録及び若しくは再生装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5517818A (en) * 1978-07-20 1980-02-07 Mitsubishi Electric Corp Procedure of focus initialization setting in optical recording unit and its equipment

Also Published As

Publication number Publication date
JPS57186238A (en) 1982-11-16

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