FR2360150A1 - Appareil de mise au point automatique - Google Patents

Appareil de mise au point automatique

Info

Publication number
FR2360150A1
FR2360150A1 FR7723236A FR7723236A FR2360150A1 FR 2360150 A1 FR2360150 A1 FR 2360150A1 FR 7723236 A FR7723236 A FR 7723236A FR 7723236 A FR7723236 A FR 7723236A FR 2360150 A1 FR2360150 A1 FR 2360150A1
Authority
FR
France
Prior art keywords
photodetector
quarters
pairs
error signal
spot
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
FR7723236A
Other languages
English (en)
French (fr)
Other versions
FR2360150B1 (enExample
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
Priority claimed from JP8909376A external-priority patent/JPS5315801A/ja
Priority claimed from JP9400176A external-priority patent/JPS5319807A/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of FR2360150A1 publication Critical patent/FR2360150A1/fr
Application granted granted Critical
Publication of FR2360150B1 publication Critical patent/FR2360150B1/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
    • 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
    • G11B7/0909—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 astigmatic methods
    • 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
    • G11B7/094—Methods and circuits for servo offset compensation

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
FR7723236A 1976-07-28 1977-07-28 Appareil de mise au point automatique Granted FR2360150A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8909376A JPS5315801A (en) 1976-07-28 1976-07-28 Optical point controller for light flux
JP9400176A JPS5319807A (en) 1976-08-09 1976-08-09 Luminous flux focus controller

Publications (2)

Publication Number Publication Date
FR2360150A1 true FR2360150A1 (fr) 1978-02-24
FR2360150B1 FR2360150B1 (enExample) 1981-05-29

Family

ID=26430526

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7723236A Granted FR2360150A1 (fr) 1976-07-28 1977-07-28 Appareil de mise au point automatique

Country Status (5)

Country Link
US (1) US4163149A (enExample)
DE (1) DE2734163C2 (enExample)
FR (1) FR2360150A1 (enExample)
GB (1) GB1590844A (enExample)
NL (1) NL7708200A (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0156418A1 (en) * 1984-03-02 1985-10-02 Koninklijke Philips Electronics N.V. Apparatus for recording and/or reading information in/from a track of a reflecting record carrier, which apparatus comprises a focusing control system with reduced spot-offset sensitivity
EP0190438A3 (en) * 1985-02-04 1987-08-12 International Business Machines Corporation Focus servo loop off-set compensation
US4823330A (en) * 1985-02-04 1989-04-18 International Business Machines Corporation Focus servo loop off-set compensation

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1131361A (en) * 1977-05-11 1982-09-07 Fumitaka Kotaka Focus servo device for use in optical read-out device of information
JPS54133305A (en) * 1978-04-07 1979-10-17 Hitachi Ltd Information recorder
JPS55927A (en) * 1978-06-16 1980-01-07 Pioneer Video Corp Focus servo unit of optical information reader
JPS5821334B2 (ja) * 1978-12-25 1983-04-28 株式会社東芝 自動焦点調節装置
NL7904724A (nl) * 1979-06-18 1980-12-22 Philips Nv Optische aftastinrichting met fokusseerstelsel.
FR2460523A1 (fr) * 1979-06-29 1981-01-23 Thomson Csf Tete de lecture optique a source laser a semi-conducteur et dispositif de lecture par reflexion d'un support d'information comportant une telle tete optique
NL7907216A (nl) * 1979-09-28 1981-03-31 Philips Nv Optisch fokusfout-detektiestelsel.
JPS5690434A (en) * 1979-12-19 1981-07-22 Hitachi Ltd Optical information reproducing device
US4504934A (en) * 1980-05-02 1985-03-12 Matsushita Electric Industrial Co., Ltd. Optical signal reproducing apparatus
JPS5766533A (en) * 1980-10-09 1982-04-22 Olympus Optical Co Ltd Optical information reader
JPS5774837A (en) * 1980-10-25 1982-05-11 Olympus Optical Co Ltd Signal detection system of optical information reproducing device
JPS57189348A (en) * 1981-05-14 1982-11-20 Olympus Optical Co Ltd Auto-focus system of optical disk
US4414658A (en) * 1981-06-12 1983-11-08 Mcdonnell Douglas Corporation Linear tracking arrangement in a photographic disc type information containing system
JPS58121148A (ja) * 1982-01-11 1983-07-19 Olympus Optical Co Ltd 光学的情報記録再生装置
JPS58128031A (ja) * 1982-01-24 1983-07-30 Sony Corp デイスク再生装置
US4622659A (en) * 1982-09-09 1986-11-11 Burroughs Corporation Focus detection and control apparatus for maintaining accurate focusing in an optical memory system by detecting reflected beam diameter variations at spaced predetermined locations
US4559622A (en) * 1982-09-09 1985-12-17 Burroughs Corporation Optical memory system providing improved focus detection and control by detecting reflected beam diameter variations at spaced predetermined locations in the system
US4621353A (en) * 1982-09-09 1986-11-04 Burroughs Corporation Optical memory system providing improved focusing control and improved beam combining and separating apparatus
NL8402943A (nl) * 1983-09-29 1985-04-16 Toshiba Kk Optische kop.
JPS6070923U (ja) * 1983-10-19 1985-05-20 パイオニア株式会社 焦点誤差検出装置
JPS6070924U (ja) * 1983-10-19 1985-05-20 パイオニア株式会社 焦点誤差検出装置
EP0157020B1 (en) * 1984-04-05 1989-03-15 Agfa-Gevaert N.V. Device for accurately focussing a laser beam
US4692608A (en) * 1984-05-18 1987-09-08 Fuji Photo Optical Company, Ltd. Compact optical imaging system
US4899327A (en) * 1985-02-04 1990-02-06 International Business Machines Corporation Focus servo loop correction
JPS629537A (ja) * 1985-07-08 1987-01-17 Pioneer Electronic Corp 光学式ピツクアツプ装置
JP2786181B2 (ja) * 1985-12-21 1998-08-13 ソニー株式会社 光ディスク装置
US4799210A (en) * 1986-11-05 1989-01-17 Unisys Corporation Fiber optic read/write head for an optical disk memory system
JPH01173323A (ja) * 1987-12-26 1989-07-10 Toshiba Corp 情報処理装置
JPH01173441A (ja) * 1987-12-28 1989-07-10 Toshiba Corp 情報記録再生装置
JPH11259873A (ja) * 1998-03-12 1999-09-24 Olympus Optical Co Ltd 光ピックアップ
EP1700299A1 (en) * 2003-12-23 2006-09-13 Koninklijke Philips Electronics N.V. Optical pick-up unit
JP2006252599A (ja) * 2005-03-08 2006-09-21 Mitsubishi Electric Corp 光学装置及びそれを用いた光デイスク装置
US20070194684A1 (en) * 2006-02-21 2007-08-23 Chen Yi-Yi Light emitting diode structure

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2271590B1 (enExample) * 1974-01-15 1978-12-01 Thomson Brandt
FR2325987A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Dispositif de lecture optique d'un enregistrement
US4065786A (en) * 1975-09-30 1977-12-27 Rca Corporation Videodisc playback system
NL7600843A (nl) * 1976-01-28 1977-08-01 Philips Nv Inrichting voor het uitlezen van een registratie- drager waarop informatie, bijvoorbeeld en/of ge- luidsinformatie, is aangebracht.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0156418A1 (en) * 1984-03-02 1985-10-02 Koninklijke Philips Electronics N.V. Apparatus for recording and/or reading information in/from a track of a reflecting record carrier, which apparatus comprises a focusing control system with reduced spot-offset sensitivity
EP0190438A3 (en) * 1985-02-04 1987-08-12 International Business Machines Corporation Focus servo loop off-set compensation
US4823330A (en) * 1985-02-04 1989-04-18 International Business Machines Corporation Focus servo loop off-set compensation

Also Published As

Publication number Publication date
DE2734163A1 (de) 1978-02-02
US4163149A (en) 1979-07-31
FR2360150B1 (enExample) 1981-05-29
DE2734163C2 (de) 1983-08-18
GB1590844A (en) 1981-06-10
NL7708200A (nl) 1978-01-31

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Legal Events

Date Code Title Description
ST Notification of lapse
ST Notification of lapse
ST Notification of lapse