CA1055156A - Apparatus for reading a disc-shaped record carrier - Google Patents

Apparatus for reading a disc-shaped record carrier

Info

Publication number
CA1055156A
CA1055156A CA212,960A CA212960A CA1055156A CA 1055156 A CA1055156 A CA 1055156A CA 212960 A CA212960 A CA 212960A CA 1055156 A CA1055156 A CA 1055156A
Authority
CA
Canada
Prior art keywords
control signal
signal
control
detector
radiation
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
CA212,960A
Other languages
English (en)
French (fr)
Other versions
CA212960S (en
Inventor
Peter J. M. Janssen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of CA1055156A publication Critical patent/CA1055156A/en
Expired legal-status Critical Current

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
    • G11B7/0948—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 specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
    • 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
    • G11B7/0903—Multi-beam tracking systems
    • 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
    • G11B7/0946—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 specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Holo Graphy (AREA)
  • Recording Measured Values (AREA)
CA212,960A 1973-11-10 1974-11-04 Apparatus for reading a disc-shaped record carrier Expired CA1055156A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7315419A NL7315419A (nl) 1973-11-10 1973-11-10 Inrichting voor het uitlezen van een schijfvor- mige registratiedrager.

Publications (1)

Publication Number Publication Date
CA1055156A true CA1055156A (en) 1979-05-22

Family

ID=19819976

Family Applications (1)

Application Number Title Priority Date Filing Date
CA212,960A Expired CA1055156A (en) 1973-11-10 1974-11-04 Apparatus for reading a disc-shaped record carrier

Country Status (17)

Country Link
JP (1) JPS5433724B2 (ja)
AR (1) AR204426A1 (ja)
AT (1) AT336298B (ja)
BE (1) BE822040A (ja)
BR (1) BR7409349A (ja)
CA (1) CA1055156A (ja)
CH (1) CH579807A5 (ja)
DE (1) DE2452815C2 (ja)
DK (1) DK135070B (ja)
ES (1) ES431776A1 (ja)
FR (1) FR2251067B1 (ja)
GB (1) GB1490726A (ja)
IT (1) IT1024778B (ja)
NL (1) NL7315419A (ja)
NO (1) NO144501C (ja)
SE (1) SE394335B (ja)
ZA (1) ZA746767B (ja)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2396379A1 (fr) * 1977-07-01 1979-01-26 Thomson Brandt Lecteur optique de disque d'information muni d'un dispositif d'acces automatique aux informations
NL7803517A (nl) * 1978-04-03 1979-10-05 Philips Nv Registratiedrager met een optisch uitleesbare fase- struktuur en inrichting voor het uitlezen.
JPS626580Y2 (ja) * 1979-11-17 1987-02-16
NL8001974A (nl) * 1980-04-03 1981-11-02 Philips Nv Spoorvolginrichting.
JPS57113428A (en) * 1980-12-29 1982-07-14 Pioneer Video Corp Focus servo device
NL8105347A (nl) * 1981-11-26 1983-06-16 Philips Nv Inrichting voor het optisch aftasten van een schijfvormige registratiedrager.
NL8105346A (ja) * 1981-11-26 1983-06-16
NL8200208A (nl) * 1982-01-21 1983-08-16 Philips Nv Inrichting voor het uitlezen van een schijfvormige registratiedrager.
JPS58143472A (ja) * 1982-02-22 1983-08-26 Hitachi Ltd 記録情報再生装置のトラツキングサ−ボ制御装置
JPS58169350A (ja) * 1982-03-31 1983-10-05 Hitachi Ltd 光学的情報記録再生装置
GB8824888D0 (en) * 1988-10-24 2002-08-14 British Aerospace Servo actuation systems

Also Published As

Publication number Publication date
GB1490726A (en) 1977-11-02
FR2251067A1 (ja) 1975-06-06
SE7413962L (ja) 1975-05-12
DK135070C (ja) 1977-08-01
SE394335B (sv) 1977-06-20
DK580974A (ja) 1975-07-07
DK135070B (da) 1977-02-28
DE2452815C2 (de) 1982-10-28
FR2251067B1 (ja) 1983-08-05
JPS5433724B2 (ja) 1979-10-23
AT336298B (de) 1977-04-25
ATA895674A (de) 1976-08-15
ES431776A1 (es) 1976-12-16
BE822040A (fr) 1975-05-09
DE2452815A1 (de) 1975-06-26
ZA746767B (en) 1976-05-26
BR7409349A (pt) 1976-05-18
AU7515574A (en) 1976-05-13
NO144501C (no) 1981-09-09
AR204426A1 (es) 1976-02-06
NO744015L (ja) 1975-06-09
IT1024778B (it) 1978-07-20
JPS5081218A (ja) 1975-07-01
NO144501B (no) 1981-06-01
CH579807A5 (ja) 1976-09-15
NL7315419A (nl) 1975-05-13

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