MY109481A - Track control circuit - Google Patents

Track control circuit

Info

Publication number
MY109481A
MY109481A MYPI90001853A MYPI19901853A MY109481A MY 109481 A MY109481 A MY 109481A MY PI90001853 A MYPI90001853 A MY PI90001853A MY PI19901853 A MYPI19901853 A MY PI19901853A MY 109481 A MY109481 A MY 109481A
Authority
MY
Malaysia
Prior art keywords
control circuit
track control
track
information medium
data
Prior art date
Application number
MYPI90001853A
Inventor
Schroder Heinz-Jorg
Zucker Friedhelm
Buchler Christian
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 MY109481A publication Critical patent/MY109481A/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
    • G11B7/0901—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 track following 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
    • G11B7/094—Methods and circuits for servo offset compensation

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Noodles (AREA)
  • Valve Device For Special Equipments (AREA)
  • Details Of Television Scanning (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Luminescent Compositions (AREA)
  • Semiconductor Lasers (AREA)
  • Control Of Charge By Means Of Generators (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Selective Calling Equipment (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Vehicle Body Suspensions (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

AT AN OPTICAL SCANNING DEVICE, WHICH SCANS THE DATA TRACKS OF AN INFORMATION MEDIUM WOBBLED ABOUT A FREQUENCY, THE LIGHT BEAM SCANNING THE DATA IS DEFLECTED FROM THE INFORMATION MEDIUM UPON A FOURQUADRANT - PHOTODETECTOR (PD) HAVING FOUR PHOTODIODES (A, B, C, D).THE OUTPUT SIGNALS OFF ALL PHOTODIODES (A, B, C, D) ARE ADDED IN AN ADDING AMPLIFIER (V2).IN ORDER TO COMPENSATE AUTOMATICALLY OFFSET VOLTAGES, WHICH CAN BE CAUSED IN THE TRACK CONTROL CIRCUIT FOR INSTANCE BY TEMPERATURE VARIATIONS IS THE OUTPUT OF THE ADDING AMPLIFIER (V2) CONNECTED WITH THE ONE INPUT OF A MULTIPLIER (M), WHOSE OTHER INPUT IS SUPPLIED WITH THE TRACK ERROR SIGNAL. THE OUTPUT SIGNAL OF THE MULTIPLIER (M) IS FED INTO THE TRACK CONTROL CIRCUIT VIA A LOW - PASS (TP) AS COMPENSATION VOLTAGE.TRACK CONTROL CIRCUIT FOR AN OPTICAL SCANNING DEVICE, WHICH SCANS THE DATA TRACK OF AN INFORMATION MEDIUM, WHICH IS WOBBLED ABOUT A FREQUENCY(FIG 1)
MYPI90001853A 1989-10-28 1990-10-23 Track control circuit MY109481A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3936033A DE3936033A1 (en) 1989-10-28 1989-10-28 TRACK CONTROL

Publications (1)

Publication Number Publication Date
MY109481A true MY109481A (en) 1997-02-28

Family

ID=6392484

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI90001853A MY109481A (en) 1989-10-28 1990-10-23 Track control circuit

Country Status (14)

Country Link
EP (1) EP0497785B1 (en)
JP (1) JP2930716B2 (en)
KR (1) KR100255044B1 (en)
CN (1) CN1020010C (en)
AT (1) ATE114380T1 (en)
AU (1) AU6400590A (en)
DE (2) DE3936033A1 (en)
ES (1) ES2064762T3 (en)
FI (1) FI921880L (en)
HK (1) HK106595A (en)
HU (1) HU208879B (en)
MY (1) MY109481A (en)
TR (1) TR24802A (en)
WO (1) WO1991006950A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4323067A1 (en) * 1993-07-10 1995-01-12 Thomson Brandt Gmbh G factor adjustment
DE4415508A1 (en) * 1994-05-03 1995-11-09 Thomson Brandt Gmbh Scanner with adaptation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2602019B2 (en) * 1987-03-12 1997-04-23 富士通株式会社 Optical disk device

Also Published As

Publication number Publication date
EP0497785B1 (en) 1994-11-23
HUT60873A (en) 1992-10-28
AU6400590A (en) 1991-05-31
HU208879B (en) 1994-01-28
DE59007780D1 (en) 1995-01-05
CN1051445A (en) 1991-05-15
EP0497785A1 (en) 1992-08-12
FI921880A0 (en) 1992-04-27
FI921880A7 (en) 1992-04-27
ES2064762T3 (en) 1995-02-01
CN1020010C (en) 1993-03-03
ATE114380T1 (en) 1994-12-15
HK106595A (en) 1995-07-07
DE3936033A1 (en) 1991-05-02
HU9201299D0 (en) 1992-07-28
TR24802A (en) 1992-05-01
JP2930716B2 (en) 1999-08-03
FI921880L (en) 1992-04-27
KR920704283A (en) 1992-12-19
JPH05501328A (en) 1993-03-11
KR100255044B1 (en) 2000-05-01
WO1991006950A1 (en) 1991-05-16

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