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
  • G11B7/0908—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 focusing only
  • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
• • 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
  • G11B7/0908—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 focusing 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
  • G11B7/0908—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 focusing only
  • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
  • G11B2007/0924—Skewed beams methods (using an angled beam, i.e. a beam which is reflected from the disc at an angle different from 90°)

Applications Claiming Priority (4)

Publications (2)

Family

ID=26645307

Family Applications (1)

Country Status (16)

Families Citing this family (10)

Family Cites Families (1)

• 1977
  • 1977-06-20 NL NL7706753A patent/NL7706753A/en not_active Application Discontinuation
• 1978
  • 1978-02-16 AR AR271114A patent/AR217276A1/en active
  • 1978-03-11 DE DE19782810566 patent/DE2810566A1/en active Granted
  • 1978-03-15 CA CA299,001A patent/CA1116294A/en not_active Expired
  • 1978-03-20 BR BR7801692A patent/BR7801692A/en unknown
  • 1978-03-20 IT IT21384/78A patent/IT1093249B/en active
  • 1978-03-20 DD DD78204290A patent/DD135654A5/en unknown
  • 1978-03-20 JP JP53032272A patent/JPS6028055B2/en not_active Expired
  • 1978-03-20 SE SE7803140A patent/SE424677B/en not_active IP Right Cessation
  • 1978-03-20 GB GB10887/78A patent/GB1589035A/en not_active Expired
  • 1978-03-20 AU AU34292/78A patent/AU516903B2/en not_active Expired
  • 1978-03-20 DK DK124478A patent/DK124478A/en unknown
  • 1978-03-21 ES ES468083A patent/ES468083A1/en not_active Expired
  • 1978-03-21 AT AT0200278A patent/AT371275B/en active
  • 1978-03-21 BE BE186137A patent/BE865140A/en not_active IP Right Cessation
  • 1978-03-22 FR FR7808297A patent/FR2385173A1/en active Granted

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