JPH0439131B2 - - Google Patents

Info

Publication number
JPH0439131B2
JPH0439131B2 JP57165258A JP16525882A JPH0439131B2 JP H0439131 B2 JPH0439131 B2 JP H0439131B2 JP 57165258 A JP57165258 A JP 57165258A JP 16525882 A JP16525882 A JP 16525882A JP H0439131 B2 JPH0439131 B2 JP H0439131B2
Authority
JP
Japan
Prior art keywords
light
light beam
optical
focus
optical fiber
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
JP57165258A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5954046A (ja
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 filed Critical
Priority to JP57165258A priority Critical patent/JPS5954046A/ja
Priority to US06/533,440 priority patent/US4626679A/en
Priority to DE3334120A priority patent/DE3334120C2/de
Publication of JPS5954046A publication Critical patent/JPS5954046A/ja
Publication of JPH0439131B2 publication Critical patent/JPH0439131B2/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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • 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
    • G11B7/0912—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 by push-pull method

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP57165258A 1982-09-22 1982-09-22 焦点検出装置 Granted JPS5954046A (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP57165258A JPS5954046A (ja) 1982-09-22 1982-09-22 焦点検出装置
US06/533,440 US4626679A (en) 1982-09-22 1983-09-19 Optical head and method of detecting the focus thereof
DE3334120A DE3334120C2 (de) 1982-09-22 1983-09-21 Optischer Kopf, insbesondere zur Fokusermittlung in einer optischen Aufzeichnungs-/Wiedergabevorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57165258A JPS5954046A (ja) 1982-09-22 1982-09-22 焦点検出装置

Publications (2)

Publication Number Publication Date
JPS5954046A JPS5954046A (ja) 1984-03-28
JPH0439131B2 true JPH0439131B2 (cs) 1992-06-26

Family

ID=15808898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57165258A Granted JPS5954046A (ja) 1982-09-22 1982-09-22 焦点検出装置

Country Status (1)

Country Link
JP (1) JPS5954046A (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100607947B1 (ko) * 1999-11-25 2006-08-03 삼성전자주식회사 기록재생용 광헤드

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5339123B2 (cs) * 1973-12-28 1978-10-19
JPS56165936A (en) * 1980-05-22 1981-12-19 Sharp Corp Optical information reproducer

Also Published As

Publication number Publication date
JPS5954046A (ja) 1984-03-28

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