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FI921879A7 - Fokusointisäätöpiiri - Google Patents

Fokusointisäätöpiiri Download PDF

Info

Publication number
FI921879A7
FI921879A7 FI921879A FI921879A FI921879A7 FI 921879 A7 FI921879 A7 FI 921879A7 FI 921879 A FI921879 A FI 921879A FI 921879 A FI921879 A FI 921879A FI 921879 A7 FI921879 A7 FI 921879A7
Authority
FI
Finland
Prior art keywords
control circuit
focusing control
focusing
circuit
control
Prior art date
Application number
FI921879A
Other languages
English (en)
Swedish (sv)
Other versions
FI921879L (fi
FI921879A0 (fi
Inventor
Friedhelm Zucker
Heinz-Jörg Schröder
CHRISTIAN BüCHLER
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 FI921879L publication Critical patent/FI921879L/fi
Publication of FI921879A0 publication Critical patent/FI921879A0/fi
Publication of FI921879A7 publication Critical patent/FI921879A7/fi

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
    • 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
FI921879A 1989-10-28 1990-09-21 Fokusointisäätöpiiri FI921879A7 (fi)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3936032A DE3936032A1 (de) 1989-10-28 1989-10-28 Fokusregelkreis
PCT/EP1990/001603 WO1991006949A1 (de) 1989-10-28 1990-09-21 Fokusregelkreis

Publications (3)

Publication Number Publication Date
FI921879L FI921879L (fi) 1992-04-27
FI921879A0 FI921879A0 (fi) 1992-04-27
FI921879A7 true FI921879A7 (fi) 1992-04-27

Family

ID=6392483

Family Applications (1)

Application Number Title Priority Date Filing Date
FI921879A FI921879A7 (fi) 1989-10-28 1990-09-21 Fokusointisäätöpiiri

Country Status (14)

Country Link
EP (1) EP0500547B1 (fi)
JP (1) JP2930715B2 (fi)
KR (1) KR100251289B1 (fi)
CN (1) CN1022518C (fi)
AT (1) ATE114381T1 (fi)
AU (1) AU6405190A (fi)
DE (2) DE3936032A1 (fi)
ES (1) ES2064763T3 (fi)
FI (1) FI921879A7 (fi)
HK (1) HK68795A (fi)
HU (1) HU208588B (fi)
MY (1) MY107278A (fi)
TR (1) TR24658A (fi)
WO (1) WO1991006949A1 (fi)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5978329A (en) * 1995-06-07 1999-11-02 Discovision Associates Technique for closed loop servo operation in optical disc tracking control
CN1295691C (zh) * 2001-05-11 2007-01-17 松下电器产业株式会社 光学头和盘记录/再现装置
DE102005018461A1 (de) 2005-04-20 2006-10-26 Deutsche Thomson-Brandt Gmbh Fokusregelung für optischen Abtaster

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPS61269241A (ja) * 1985-05-24 1986-11-28 Sony Corp 光学ヘツド用焦点検出装置

Also Published As

Publication number Publication date
HU208588B (en) 1993-11-29
MY107278A (en) 1995-10-31
FI921879L (fi) 1992-04-27
DE3936032A1 (de) 1991-05-02
JP2930715B2 (ja) 1999-08-03
HK68795A (en) 1995-05-12
ES2064763T3 (es) 1995-02-01
HU9201300D0 (en) 1992-07-28
KR100251289B1 (ko) 2000-04-15
TR24658A (tr) 1992-03-01
HUT60874A (en) 1992-10-28
JPH05501327A (ja) 1993-03-11
CN1022518C (zh) 1993-10-20
EP0500547B1 (de) 1994-11-23
FI921879A0 (fi) 1992-04-27
EP0500547A1 (de) 1992-09-02
WO1991006949A1 (de) 1991-05-16
DE59007781D1 (de) 1995-01-05
CN1051444A (zh) 1991-05-15
ATE114381T1 (de) 1994-12-15
KR920704282A (ko) 1992-12-19
AU6405190A (en) 1991-05-31

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Legal Events

Date Code Title Description
FD Application lapsed