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
  • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
  • G11B7/005—Reproducing
• • 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
  • G11B7/0938—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 servo format, e.g. guide tracks, pilot signals
• • 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
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
  • G11B7/24085—Pits

Landscapes

• Optical Recording Or Reproduction (AREA)
• Optical Record Carriers And Manufacture Thereof (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19820729

Family Applications (2)

Family Applications Before (1)

Country Status (16)

Families Citing this family (9)

Family Cites Families (3)

• 1974
  • 1974-02-12 NL NL7401858A patent/NL7401858A/xx not_active Application Discontinuation
• 1975
  • 1975-01-07 ZA ZA00750131A patent/ZA75131B/xx unknown
  • 1975-01-31 DE DE19752503975 patent/DE2503975A1/de not_active Withdrawn
  • 1975-02-06 CA CA219,532A patent/CA1047644A/en not_active Expired
  • 1975-02-07 GB GB5302/75A patent/GB1501141A/en not_active Expired
  • 1975-02-07 DK DK45475AA patent/DK138567B/da unknown
  • 1975-02-10 SE SE7501407A patent/SE410808B/xx unknown
  • 1975-02-10 BE BE153229A patent/BE825379A/xx unknown
  • 1975-02-10 AT AT98275A patent/AT338889B/de not_active IP Right Cessation
  • 1975-02-10 AU AU78025/75A patent/AU497709B2/en not_active Expired
  • 1975-02-10 ES ES434588A patent/ES434588A1/es not_active Expired
  • 1975-02-10 CH CH156575A patent/CH592350A5/xx not_active IP Right Cessation
  • 1975-02-10 NO NO750416A patent/NO750416L/no unknown
  • 1975-02-10 IT IT20089/75A patent/IT1031581B/it active
  • 1975-02-12 FR FR7504326A patent/FR2260911B1/fr not_active Expired
  • 1975-02-12 JP JP50017757A patent/JPS50119517A/ja active Pending
• 1976
  • 1976-10-27 ES ES452770A patent/ES452770A1/es not_active Expired

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