FR2497379B1 - - Google Patents

Info

Publication number
FR2497379B1
FR2497379B1 FR8124176A FR8124176A FR2497379B1 FR 2497379 B1 FR2497379 B1 FR 2497379B1 FR 8124176 A FR8124176 A FR 8124176A FR 8124176 A FR8124176 A FR 8124176A FR 2497379 B1 FR2497379 B1 FR 2497379B1
Authority
FR
France
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
FR8124176A
Other versions
FR2497379A1 (fr
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Publication of FR2497379A1 publication Critical patent/FR2497379A1/fr
Application granted granted Critical
Publication of FR2497379B1 publication Critical patent/FR2497379B1/fr
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
    • 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
    • G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0953—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for eccentricity of the disc or disc tracks
    • 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
    • G11B7/13—Optical detectors therefor

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
FR8124176A 1980-12-27 1981-12-23 Dispositif de detection de signaux pour appareil de lecture d'informations optiques Granted FR2497379A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55188796A JPS57111837A (en) 1980-12-27 1980-12-27 Signal detecting system of optical information reader

Publications (2)

Publication Number Publication Date
FR2497379A1 FR2497379A1 (fr) 1982-07-02
FR2497379B1 true FR2497379B1 (fr) 1985-01-04

Family

ID=16229944

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8124176A Granted FR2497379A1 (fr) 1980-12-27 1981-12-23 Dispositif de detection de signaux pour appareil de lecture d'informations optiques

Country Status (4)

Country Link
US (1) US4445208A (fr)
JP (1) JPS57111837A (fr)
DE (1) DE3151157A1 (fr)
FR (1) FR2497379A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5870434A (ja) * 1981-10-22 1983-04-26 Toshiba Corp 光学ヘツド
JPS58208944A (ja) * 1982-05-31 1983-12-05 Sony Corp 光学ヘツド制御信号発生装置
JPS59125727U (ja) * 1983-02-15 1984-08-24 パイオニア株式会社 光学式情報ピツクアツプ装置
JPH0633537Y2 (ja) * 1984-06-30 1994-08-31 ソニ−株式会社 感光性半導体装置
US5416755A (en) * 1985-02-28 1995-05-16 Canon Kabushiki Kaisha Optical pickup using split beams impinging on different photo-detector areas
US4879706A (en) * 1987-07-29 1989-11-07 Laser Magnetic Storage International Company Method and apparatus for focus and tracking in an optical disk system
JPH05242512A (ja) * 1991-12-19 1993-09-21 Matsushita Electric Ind Co Ltd 光ディスク装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2212070A6 (fr) * 1972-08-25 1974-07-19 Thomson Csf
FR2266932B1 (fr) * 1973-03-02 1977-09-02 Thomson Brandt
NL182258C (nl) * 1976-01-28 1988-02-01 Philips Nv Inrichting voor het uitlezen van een vlakke registratiedrager met een optisch uitleesbare informatiestructuur.
NL182990C (nl) * 1975-07-07 1988-06-16 Philips Nv Inrichting voor het uitlezen van een stralingsreflekterende registratiedrager.
JPS5319806A (en) * 1976-08-09 1978-02-23 Hitachi Ltd Information reproducer
JPS5398802A (en) * 1977-02-09 1978-08-29 Mitsubishi Electric Corp Optical reproducer
NL7803969A (nl) * 1978-04-14 1979-10-16 Philips Nv Opto-elektronisch fokusfout-detektiestelsel.
US4349901A (en) * 1980-06-20 1982-09-14 Eastman Kodak Company Apparatus and method for reading optical discs

Also Published As

Publication number Publication date
JPS6239493B2 (fr) 1987-08-24
US4445208A (en) 1984-04-24
DE3151157C2 (fr) 1988-06-30
DE3151157A1 (de) 1982-07-08
JPS57111837A (en) 1982-07-12
FR2497379A1 (fr) 1982-07-02

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Legal Events

Date Code Title Description
ST Notification of lapse