Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
  • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
  • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
  • G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
• • 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
  • G11B7/0914—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 by non-optical methods, e.g. capacitive

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
• Optical Recording Or Reproduction (AREA)
• Control Of Position Or Direction (AREA)
• Automatic Focus Adjustment (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9980444

Family Applications (1)

Country Status (6)

Families Citing this family (6)

Family Cites Families (6)

• 1976
  • 1976-03-19 GB GB1112276A patent/GB1577134A/en not_active Expired
• 1977
  • 1977-03-18 FR FR7708222A patent/FR2344888A1/en not_active Withdrawn
  • 1977-03-18 JP JP3101977A patent/JPS52125351A/en active Pending
  • 1977-03-18 NL NL7702978A patent/NL7702978A/en not_active Application Discontinuation
  • 1977-03-18 DE DE19772711925 patent/DE2711925C3/en not_active Expired
  • 1977-03-18 AU AU23390/77A patent/AU506893B2/en not_active Expired

Also Published As

Similar Documents

Legal Events