GB1490726A - Reading optically-recorded discs - Google Patents

Reading optically-recorded discs

Info

Publication number
GB1490726A
GB1490726A GB48309/74A GB4830974A GB1490726A GB 1490726 A GB1490726 A GB 1490726A GB 48309/74 A GB48309/74 A GB 48309/74A GB 4830974 A GB4830974 A GB 4830974A GB 1490726 A GB1490726 A GB 1490726A
Authority
GB
United Kingdom
Prior art keywords
reading optically
recorded discs
discs
recorded
optically
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
GB48309/74A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1490726A publication Critical patent/GB1490726A/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
GB48309/74A 1973-11-10 1974-11-07 Reading optically-recorded discs Expired GB1490726A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7315419A NL7315419A (en) 1973-11-10 1973-11-10 DEVICE FOR READING A DISK-SHAPED REGISTRATION CARRIER.

Publications (1)

Publication Number Publication Date
GB1490726A true GB1490726A (en) 1977-11-02

Family

ID=19819976

Family Applications (1)

Application Number Title Priority Date Filing Date
GB48309/74A Expired GB1490726A (en) 1973-11-10 1974-11-07 Reading optically-recorded discs

Country Status (17)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2375833A (en) * 1988-10-24 2002-11-27 British Aerospace Servo actuation systems

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2396379A1 (en) * 1977-07-01 1979-01-26 Thomson Brandt OPTICAL INFORMATION DISC READER EQUIPPED WITH AN AUTOMATIC INFORMATION ACCESS DEVICE
NL7803517A (en) * 1978-04-03 1979-10-05 Philips Nv RECORD CARRIER WITH AN OPTICALLY READABLE PHASE STRUCTURE AND DEVICE FOR READING.
JPS626580Y2 (en) * 1979-11-17 1987-02-16
NL8001974A (en) * 1980-04-03 1981-11-02 Philips Nv TRACKING DEVICE.
JPS57113428A (en) * 1980-12-29 1982-07-14 Pioneer Video Corp Focus servo device
NL8105346A (en) * 1981-11-26 1983-06-16
NL8105347A (en) * 1981-11-26 1983-06-16 Philips Nv Apparatus for the optical scanning of a disc-shaped record carrier.
NL8200208A (en) * 1982-01-21 1983-08-16 Philips Nv DEVICE FOR READING A DISC REGISTRATION CARRIER.
JPS58143472A (en) * 1982-02-22 1983-08-26 Hitachi Ltd Tracking servo controller of recording information reproducing device
JPS58169350A (en) * 1982-03-31 1983-10-05 Hitachi Ltd Optical track shift detecting system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2375833A (en) * 1988-10-24 2002-11-27 British Aerospace Servo actuation systems
GB2375833B (en) * 1988-10-24 2003-03-05 British Aerospace Servo actuation systems
US6969025B1 (en) 1988-10-24 2005-11-29 Mbda Uk Limited Servo actuation systems

Also Published As

Publication number Publication date
FR2251067B1 (en) 1983-08-05
BE822040A (en) 1975-05-09
FR2251067A1 (en) 1975-06-06
DE2452815C2 (en) 1982-10-28
NL7315419A (en) 1975-05-13
JPS5081218A (en) 1975-07-01
DK580974A (en) 1975-07-07
NO144501B (en) 1981-06-01
ZA746767B (en) 1976-05-26
ATA895674A (en) 1976-08-15
IT1024778B (en) 1978-07-20
JPS5433724B2 (en) 1979-10-23
DK135070B (en) 1977-02-28
NO744015L (en) 1975-06-09
CA1055156A (en) 1979-05-22
SE7413962L (en) 1975-05-12
ES431776A1 (en) 1976-12-16
NO144501C (en) 1981-09-09
DE2452815A1 (en) 1975-06-26
AU7515574A (en) 1976-05-13
AR204426A1 (en) 1976-02-06
DK135070C (en) 1977-08-01
AT336298B (en) 1977-04-25
CH579807A5 (en) 1976-09-15
BR7409349A (en) 1976-05-18
SE394335B (en) 1977-06-20

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19931107