GB1590844A - Automatic focussing apparatus - Google Patents

Automatic focussing apparatus Download PDF

Info

Publication number
GB1590844A
GB1590844A GB31616/77A GB3161677A GB1590844A GB 1590844 A GB1590844 A GB 1590844A GB 31616/77 A GB31616/77 A GB 31616/77A GB 3161677 A GB3161677 A GB 3161677A GB 1590844 A GB1590844 A GB 1590844A
Authority
GB
United Kingdom
Prior art keywords
signal
light beam
focusing
spot
disturbance
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
Application number
GB31616/77A
Other languages
English (en)
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 GB1590844A publication Critical patent/GB1590844A/en
Expired 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)
GB31616/77A 1976-07-28 1977-07-27 Automatic focussing apparatus Expired GB1590844A (en)

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 (1)

Publication Number Publication Date
GB1590844A true GB1590844A (en) 1981-06-10

Family

ID=26430526

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31616/77A Expired GB1590844A (en) 1976-07-28 1977-07-27 Automatic focussing apparatus

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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2150385A (en) * 1983-10-19 1985-06-26 Pioneer Electronic Corp Video disc focussing

Families Citing this family (35)

* 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.
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
NL8400674A (nl) * 1984-03-02 1985-10-01 Philips Nv Inrichting voor het inschrijven en/of uitlezen van informatie in een spoor van een reflekterende registratiedrager, met een fokusregeling met verminderde spot offsetgevoeligheid.
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
US4823330A (en) * 1985-02-04 1989-04-18 International Business Machines Corporation Focus servo loop off-set compensation
JPS61177646A (ja) * 1985-02-04 1986-08-09 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション 光学デイスク装置
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2150385A (en) * 1983-10-19 1985-06-26 Pioneer Electronic Corp Video disc focussing

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
NL7708200A (nl) 1978-01-31
FR2360150A1 (fr) 1978-02-24

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950727