HK13096A - Method of focussing a light beam onto an optical record carrier - Google Patents

Method of focussing a light beam onto an optical record carrier

Info

Publication number
HK13096A
HK13096A HK13096A HK13096A HK13096A HK 13096 A HK13096 A HK 13096A HK 13096 A HK13096 A HK 13096A HK 13096 A HK13096 A HK 13096A HK 13096 A HK13096 A HK 13096A
Authority
HK
Hong Kong
Prior art keywords
focussing
light beam
record carrier
beam onto
optical record
Prior art date
Application number
HK13096A
Other languages
English (en)
Inventor
Dieter Baas
Arthur Kurz
Friedrich Fueldner
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 HK13096A publication Critical patent/HK13096A/xx

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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • 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
    • G11B7/0945—Methods for initialising servos, start-up sequences
    • 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
    • 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
    • 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

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Automatic Focus Adjustment (AREA)
  • Manufacturing Optical Record Carriers (AREA)
HK13096A 1985-03-09 1996-01-25 Method of focussing a light beam onto an optical record carrier HK13096A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853508525 DE3508525A1 (de) 1985-03-09 1985-03-09 Fokus-such-einrichtung fuer beruehrungslose abtastung

Publications (1)

Publication Number Publication Date
HK13096A true HK13096A (en) 1996-02-02

Family

ID=6264774

Family Applications (1)

Application Number Title Priority Date Filing Date
HK13096A HK13096A (en) 1985-03-09 1996-01-25 Method of focussing a light beam onto an optical record carrier

Country Status (8)

Country Link
EP (2) EP0214194B1 (ko)
JP (1) JPS62501998A (ko)
KR (1) KR920000426B1 (ko)
AT (2) ATE115318T1 (ko)
DE (3) DE3508525A1 (ko)
DK (1) DK535086D0 (ko)
HK (1) HK13096A (ko)
WO (1) WO1986005306A1 (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0291827A (ja) * 1988-09-28 1990-03-30 Toshiba Corp 光学式ディスク再生装置のサーボ系オフセット調整回路
DE69425385T2 (de) * 1993-04-02 2001-02-15 Sony Corp Servosystem zum Fokussieren und Verfahren zum Ermöglichen der Erfassung eines Fokussierungsservosystems

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2330062A1 (fr) * 1975-10-31 1977-05-27 Thomson Brandt Dispositif de recherche de focalisation et lecteur optique comportant un tel dispositif
SE7813460L (sv) * 1978-03-27 1979-09-28 Mca Disco Vision Videoskivspelare
JPS5593541A (en) * 1979-01-10 1980-07-16 Pioneer Video Corp Polarization mirror driving unit in optical information reader
JPS55118338A (en) * 1979-03-08 1980-09-11 Taiyo Mfg Horizontal type mefun removing machine
JPS56148747A (en) * 1980-04-18 1981-11-18 Mitsubishi Electric Corp Focus controller
JPS56159844A (en) * 1980-05-09 1981-12-09 Mitsubishi Electric Corp Focus control device
JPS5877035A (ja) * 1981-10-08 1983-05-10 Mitsubishi Electric Corp 自動焦点引込み装置
JPS58121137A (ja) * 1982-01-09 1983-07-19 Sony Corp 光学式デイスク再生装置のフオ−カス引込み回路
JPS58128031A (ja) * 1982-01-24 1983-07-30 Sony Corp デイスク再生装置
JPS592235A (ja) * 1982-06-28 1984-01-07 Pioneer Electronic Corp 光学式情報読取装置におけるサ−ボ装置
JPS598144A (ja) * 1982-07-05 1984-01-17 Trio Kenwood Corp 光学的情報読取装置
JPS5942649A (ja) * 1982-09-02 1984-03-09 Mitsubishi Electric Corp 光学的サ−ボ装置
JPS59188845A (ja) * 1983-04-08 1984-10-26 Onkyo Corp 光ピツクアツプ
US4607157A (en) * 1984-02-09 1986-08-19 Xerox Corporation Automatic focus offset correction system

Also Published As

Publication number Publication date
EP0432658A3 (en) 1991-09-04
EP0214194A1 (de) 1987-03-18
EP0432658A2 (de) 1991-06-19
EP0214194B1 (de) 1991-12-18
EP0432658B1 (de) 1994-12-07
ATE115318T1 (de) 1994-12-15
KR880700400A (ko) 1988-03-15
DE3650167D1 (de) 1995-01-19
KR920000426B1 (ko) 1992-01-13
DK535086A (da) 1986-11-07
DE3682980D1 (de) 1992-01-30
DE3508525A1 (de) 1986-09-11
ATE70652T1 (de) 1992-01-15
WO1986005306A1 (en) 1986-09-12
DK535086D0 (da) 1986-11-07
JPS62501998A (ja) 1987-08-06
JPH0576100B2 (ko) 1993-10-21

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Legal Events

Date Code Title Description
PF Patent in force
PE Patent expired

Effective date: 20060220