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

Applications Claiming Priority (1)

Publications (3)

Family

ID=19819976

Family Applications (1)

Country Status (17)

Families Citing this family (11)

• 1973
  • 1973-11-10 NL NL7315419A patent/NL7315419A/xx not_active Application Discontinuation
• 1974
  • 1974-01-01 AR AR256416A patent/AR204426A1/es active
  • 1974-10-24 ZA ZA00746767A patent/ZA746767B/xx unknown
  • 1974-11-04 CA CA212,960A patent/CA1055156A/en not_active Expired
  • 1974-11-07 CH CH1490774A patent/CH579807A5/xx not_active IP Right Cessation
  • 1974-11-07 DE DE2452815A patent/DE2452815C2/de not_active Expired
  • 1974-11-07 GB GB48309/74A patent/GB1490726A/en not_active Expired
  • 1974-11-07 DK DK580974AA patent/DK135070B/da not_active IP Right Cessation
  • 1974-11-07 SE SE7413962A patent/SE394335B/xx not_active IP Right Cessation
  • 1974-11-07 NO NO744015A patent/NO144501C/no unknown
  • 1974-11-07 JP JP12763274A patent/JPS5433724B2/ja not_active Expired
  • 1974-11-07 IT IT70277/74A patent/IT1024778B/it active
  • 1974-11-07 BR BR9349/74A patent/BR7409349A/pt unknown
  • 1974-11-08 FR FR7437019A patent/FR2251067B1/fr not_active Expired
  • 1974-11-08 AT AT895674A patent/AT336298B/de not_active IP Right Cessation
  • 1974-11-08 ES ES431776A patent/ES431776A1/es not_active Expired
  • 1974-11-08 BE BE150377A patent/BE822040A/xx not_active IP Right Cessation

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