HK33396A - Track control system for positioning a light beam - Google Patents

Track control system for positioning a light beam

Info

Publication number
HK33396A
HK33396A HK33396A HK33396A HK33396A HK 33396 A HK33396 A HK 33396A HK 33396 A HK33396 A HK 33396A HK 33396 A HK33396 A HK 33396A HK 33396 A HK33396 A HK 33396A
Authority
HK
Hong Kong
Prior art keywords
disc
light beam
photodetector
control system
track control
Prior art date
Application number
HK33396A
Inventor
Friedrich Fueldner
Arthur Kurz
Dieter Baas
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 HK33396A publication Critical patent/HK33396A/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
    • G11B7/094—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
    • G11B7/09—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

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

In a CD player, a light beam for reading the information is focused onto the CD disc. Serving for this purpose is an optical scanning system with a laser diode, a plurality of lenses and a photodetector (P), onto which the CD disc reflects the light beam. By means of a track control system, the optical scanning system is displaced in the radial direction with respect to the CD disc, so that the light beam is taken along the spiral data tracks. Until now, offset voltages of the photodetector (P) have been compensated by manual adjustment of a potentiometer. In order to replace the laborious manual adjustment by an automatic compensation of the offset voltage, with an open control loop a compensation voltage is superimposed on the output voltage of the photodetector (P) and varied until the sum of the output voltage and the compensation voltage assumes a predeterminable value. The control loop is then closed. The track control system is suitable for playback devices which reproduce information from optical recording media in disc form, for example CD players and video-disc players. <IMAGE>
HK33396A 1986-12-15 1996-02-29 Track control system for positioning a light beam HK33396A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863642763 DE3642763A1 (en) 1986-12-15 1986-12-15 TRACK CONTROL CIRCUIT FOR GUIDING A LIGHT BEAM

Publications (1)

Publication Number Publication Date
HK33396A true HK33396A (en) 1996-03-08

Family

ID=6316205

Family Applications (1)

Application Number Title Priority Date Filing Date
HK33396A HK33396A (en) 1986-12-15 1996-02-29 Track control system for positioning a light beam

Country Status (8)

Country Link
EP (1) EP0274031B1 (en)
JP (1) JP2602859B2 (en)
KR (1) KR910002752B1 (en)
AT (1) ATE70653T1 (en)
DE (2) DE3642763A1 (en)
DK (1) DK658987A (en)
ES (1) ES2028851T3 (en)
HK (1) HK33396A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0675291B2 (en) * 1988-06-23 1994-09-21 シャープ株式会社 Feedback controller for optical recording / reproducing apparatus
JP2698635B2 (en) * 1988-12-20 1998-01-19 富士通株式会社 Optical disk apparatus and track servo offset correction method therefor
US5016992A (en) * 1989-03-16 1991-05-21 Forschungszentrum Julich Gmbh Method of and apparatus for the reading of magnetically stored information
DE4017487A1 (en) * 1990-05-31 1991-12-05 Thomson Brandt Gmbh SERVO CONTROL CIRCUIT
DE4323067A1 (en) * 1993-07-10 1995-01-12 Thomson Brandt Gmbh G factor adjustment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5873023A (en) * 1981-10-27 1983-05-02 Pioneer Electronic Corp Tracking servo signal generator in information reader
JPS5919250A (en) * 1982-07-21 1984-01-31 Hitachi Ltd Recording and reproducing device of optical information
JPS609020U (en) * 1983-06-29 1985-01-22 パイオニア株式会社 Tracking device for optical disks

Also Published As

Publication number Publication date
JPS63173237A (en) 1988-07-16
KR910002752B1 (en) 1991-05-04
DK658987A (en) 1988-06-16
DK658987D0 (en) 1987-12-15
DE3775373D1 (en) 1992-01-30
ATE70653T1 (en) 1992-01-15
EP0274031A1 (en) 1988-07-13
DE3642763A1 (en) 1988-06-23
KR880008256A (en) 1988-08-30
JP2602859B2 (en) 1997-04-23
ES2028851T3 (en) 1992-07-16
EP0274031B1 (en) 1991-12-18

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Legal Events

Date Code Title Description
PF Patent in force
PE Patent expired

Effective date: 20071118