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
  • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
• • 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

Landscapes

• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Optical Recording Or Reproduction (AREA)
• Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
• Length Measuring Devices By Optical Means (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19819855

Family Applications (1)

Country Status (15)

Families Citing this family (1)

• 1973
  • 1973-10-20 NL NL7314464A patent/NL7314464A/xx not_active Application Discontinuation
• 1974
  • 1974-10-12 DE DE19742448792 patent/DE2448792A1/de not_active Withdrawn
  • 1974-10-17 AT AT835874A patent/AT339390B/de not_active IP Right Cessation
  • 1974-10-17 CH CH1394474A patent/CH574151A5/xx not_active IP Right Cessation
  • 1974-10-17 CA CA211,612A patent/CA1040741A/en not_active Expired
  • 1974-10-17 JP JP49118787A patent/JPS5068731A/ja active Pending
  • 1974-10-17 NO NO743762A patent/NO743762L/no unknown
  • 1974-10-17 BR BR8645/74A patent/BR7408645D0/pt unknown
  • 1974-10-17 SE SE7413069A patent/SE7413069L/xx unknown
  • 1974-10-17 GB GB4509174A patent/GB1475179A/en not_active Expired
  • 1974-10-17 IT IT70103/74A patent/IT1024629B/it active
  • 1974-10-17 DK DK545474A patent/DK545474A/da unknown
  • 1974-10-18 ES ES431129A patent/ES431129A1/es not_active Expired
  • 1974-10-18 BE BE149705A patent/BE821269A/xx unknown
  • 1974-10-21 FR FR7435270A patent/FR2248569B1/fr not_active Expired

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