SG8992G - Focus regulation for an apparatus for disc-shaped rotating information supports - Google Patents

Focus regulation for an apparatus for disc-shaped rotating information supports

Info

Publication number
SG8992G
SG8992G SG89/92A SG8992A SG8992G SG 8992 G SG8992 G SG 8992G SG 89/92 A SG89/92 A SG 89/92A SG 8992 A SG8992 A SG 8992A SG 8992 G SG8992 G SG 8992G
Authority
SG
Singapore
Prior art keywords
pct
disc
shaped rotating
information supports
rotating information
Prior art date
Application number
SG89/92A
Other languages
English (en)
Original Assignee
Thomson Brandt Gmbh
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 Thomson Brandt Gmbh filed Critical Thomson Brandt Gmbh
Publication of SG8992G publication Critical patent/SG8992G/en

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
    • 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
    • G11B7/0948—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 detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
    • 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
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
    • 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
SG89/92A 1985-02-06 1992-01-31 Focus regulation for an apparatus for disc-shaped rotating information supports SG8992G (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853503983 DE3503983A1 (de) 1985-02-06 1985-02-06 Fokus-regelung fuer ein geraet fuer plattenfoermige, rotierende informationstraeger
PCT/EP1986/000029 WO1986004721A1 (en) 1985-02-06 1986-01-24 Focus regulation for an apparatus for disc-shaped rotating information supports

Publications (1)

Publication Number Publication Date
SG8992G true SG8992G (en) 1992-03-20

Family

ID=6261797

Family Applications (1)

Application Number Title Priority Date Filing Date
SG89/92A SG8992G (en) 1985-02-06 1992-01-31 Focus regulation for an apparatus for disc-shaped rotating information supports

Country Status (9)

Country Link
US (1) US4809253A (ja)
EP (1) EP0211912B1 (ja)
JP (1) JPS62501737A (ja)
KR (1) KR920002555B1 (ja)
AT (1) ATE56559T1 (ja)
DE (2) DE3503983A1 (ja)
DK (1) DK476786A (ja)
SG (1) SG8992G (ja)
WO (1) WO1986004721A1 (ja)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974221A (en) * 1987-07-17 1990-11-27 Canon Kabushiki Kaisha Method and apparatus for reproducing information by varying a sensitivity of a phase-locked loop in accordance with a detection state of a reproduced signal
US4941139A (en) * 1988-09-02 1990-07-10 International Business Machines Corporation Checking media operations and recording during optical recording
US5018126A (en) * 1988-09-02 1991-05-21 International Business Machines Corporation Checking media operations and recording during optical recording
CA2015267A1 (en) * 1989-05-26 1990-11-26 Rainer Seele 8-azolylmethylquinolines
DE4102857A1 (de) * 1991-01-31 1992-08-06 Thomson Brandt Gmbh Verfahren zum fokussieren eines lichtstrahls
EP0911713B1 (en) * 1997-10-21 2004-09-22 Deutsche Thomson-Brandt Gmbh Corrected servo control signal in a servo control loop
EP0911712A1 (en) 1997-10-21 1999-04-28 Deutsche Thomson-Brandt Gmbh Corrected servo control signal in a servo control loop
WO2002025640A2 (en) * 2000-09-21 2002-03-28 Gsi Lumonics Corporation Digital control servo system
JP2002109822A (ja) * 2000-09-29 2002-04-12 Fujitsu Ltd 回転制御方法及び記憶装置
GB0313887D0 (en) * 2003-06-16 2003-07-23 Gsi Lumonics Ltd Monitoring and controlling of laser operation
DE602005011248D1 (de) * 2004-01-23 2009-01-08 Gsi Group Corp System und verfahren zum optimieren der zeichenmarkierungsleistung

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57113428A (en) * 1980-12-29 1982-07-14 Pioneer Video Corp Focus servo device
US4406000A (en) * 1981-03-31 1983-09-20 Discovision Associates Tracking system for optical record medium
US4414655A (en) * 1981-03-31 1983-11-08 Discovision Associates Scanning beam control system
DE3280137D1 (de) * 1981-09-17 1990-04-19 Toshiba Kawasaki Kk Ein optischer kopf.
JPS58189842A (ja) * 1982-04-30 1983-11-05 Toshiba Corp 光学式デジタルデイスクプレ−ヤ装置
DE3367134D1 (en) * 1982-05-31 1986-11-27 Hitachi Ltd Servo circuit for a signal reproducing apparatus
JPS59152573A (ja) * 1983-02-19 1984-08-31 Sony Corp 情報再生装置のサ−ボコントロ−ル回路
DE3340712A1 (de) * 1982-11-11 1984-05-17 Sony Corp., Tokio/Tokyo Spurhalteschaltung fuer optische wiedergabegeraete
NL8300291A (nl) * 1983-01-27 1984-08-16 Philips Nv Inrichting voor het uitlezen van een optische registratiedrager.
JPS59157854A (ja) * 1983-02-28 1984-09-07 Sony Corp 光学式デイスク・プレ−ヤ−の制御装置
JPS59229773A (ja) * 1983-06-10 1984-12-24 Pioneer Electronic Corp 記録情報読取装置
JP2548106B2 (ja) * 1984-05-23 1996-10-30 ソニー株式会社 光学式デイスクプレ−ヤのトラツキング・サ−ボコントロ−ル装置
US4701603A (en) * 1985-10-17 1987-10-20 Optical Disc Corporation Focus control system for optical information recorder or player

Also Published As

Publication number Publication date
EP0211912B1 (de) 1990-09-12
US4809253A (en) 1989-02-28
ATE56559T1 (de) 1990-09-15
DK476786D0 (da) 1986-10-06
KR880700397A (ko) 1988-03-15
DK476786A (da) 1986-10-06
WO1986004721A1 (en) 1986-08-14
JPS62501737A (ja) 1987-07-09
KR920002555B1 (ko) 1992-03-27
DE3503983A1 (de) 1986-08-07
DE3674108D1 (de) 1990-10-18
EP0211912A1 (de) 1987-03-04

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