DK535086D0 - PROCEDURE AND CIRCULAR DEVICE FOR FOCUSING A LIGHT Beam ON AN OPTICAL RECORDER - Google Patents

PROCEDURE AND CIRCULAR DEVICE FOR FOCUSING A LIGHT Beam ON AN OPTICAL RECORDER

Info

Publication number
DK535086D0
DK535086D0 DK535086A DK535086A DK535086D0 DK 535086 D0 DK535086 D0 DK 535086D0 DK 535086 A DK535086 A DK 535086A DK 535086 A DK535086 A DK 535086A DK 535086 D0 DK535086 D0 DK 535086D0
Authority
DK
Denmark
Prior art keywords
focusing
procedure
light beam
optical recorder
circular device
Prior art date
Application number
DK535086A
Other languages
Danish (da)
Other versions
DK535086A (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 DK535086A publication Critical patent/DK535086A/en
Publication of DK535086D0 publication Critical patent/DK535086D0/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
    • G11B7/085—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)

Abstract

After the reaching of the focal point, a regulating circuit is closed, and the pulse modulated value detected at the focal point stored. The control voltage (Us) produced from the pulse modulated voltage, serves as an offset voltage for the actuator (4). The control voltage (Us) is superimposed by an AC component.
DK535086A 1985-03-09 1986-11-07 PROCEDURE AND CIRCULAR DEVICE FOR FOCUSING A LIGHT Beam ON AN OPTICAL RECORDER DK535086D0 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853508525 DE3508525A1 (en) 1985-03-09 1985-03-09 FOCUS SEARCH DEVICE FOR CONTACTLESS SCANNING
PCT/DE1986/000065 WO1986005306A1 (en) 1985-03-09 1986-02-21 Process and circuit arrangement for focussing a light beam onto an optical recording medium

Publications (2)

Publication Number Publication Date
DK535086A DK535086A (en) 1986-11-07
DK535086D0 true DK535086D0 (en) 1986-11-07

Family

ID=6264774

Family Applications (1)

Application Number Title Priority Date Filing Date
DK535086A DK535086D0 (en) 1985-03-09 1986-11-07 PROCEDURE AND CIRCULAR DEVICE FOR FOCUSING A LIGHT Beam ON AN OPTICAL RECORDER

Country Status (8)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0291827A (en) * 1988-09-28 1990-03-30 Toshiba Corp Circuit for adjusting offset of servo system of optical disk reproducing device
DE69418761T2 (en) * 1993-04-02 1999-10-21 Sony Corp., Tokio/Tokyo Focusing servo system and method for enabling the detection of a focusing servo system

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2330062A1 (en) * 1975-10-31 1977-05-27 Thomson Brandt FOCUS SEARCH DEVICE AND OPTICAL READER INCLUDING SUCH A DEVICE
SE7813460L (en) * 1978-03-27 1979-09-28 Mca Disco Vision VIDEO PLAYER
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 (en) * 1981-10-08 1983-05-10 Mitsubishi Electric Corp Automatic focus drawing-in device
JPS58121137A (en) * 1982-01-09 1983-07-19 Sony Corp Focus drawing-in circuit of optical disk reproducer
JPS58128031A (en) * 1982-01-24 1983-07-30 Sony Corp Disc reproducer
JPS592235A (en) * 1982-06-28 1984-01-07 Pioneer Electronic Corp Servo device of optical information reader
JPS598144A (en) * 1982-07-05 1984-01-17 Trio Kenwood Corp Optical information reader
JPS5942649A (en) * 1982-09-02 1984-03-09 Mitsubishi Electric Corp Optical servo-device
JPS59188845A (en) * 1983-04-08 1984-10-26 Onkyo Corp Optical pickup
US4607157A (en) * 1984-02-09 1986-08-19 Xerox Corporation Automatic focus offset correction system

Also Published As

Publication number Publication date
DK535086A (en) 1986-11-07
JPS62501998A (en) 1987-08-06
KR920000426B1 (en) 1992-01-13
ATE115318T1 (en) 1994-12-15
DE3682980D1 (en) 1992-01-30
EP0432658A2 (en) 1991-06-19
EP0432658B1 (en) 1994-12-07
EP0214194A1 (en) 1987-03-18
EP0432658A3 (en) 1991-09-04
DE3650167D1 (en) 1995-01-19
EP0214194B1 (en) 1991-12-18
KR880700400A (en) 1988-03-15
ATE70652T1 (en) 1992-01-15
HK13096A (en) 1996-02-02
JPH0576100B2 (en) 1993-10-21
WO1986005306A1 (en) 1986-09-12
DE3508525A1 (en) 1986-09-11

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Legal Events

Date Code Title Description
AHS Application shelved for other reasons than non-payment