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US 5,475,667 AGranted
Method for inspecting an optical disc
AssigneesPioneer Electronic Corporation, Pioneer Video Corporation
InventorsKenji Kamimura, Shinichi Hanzawa
Life of this patent
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Abstract
An optical pickup for emitting a laser beam is provided for reading data recorded on an optical disc. The axis of the laser beam is tilted at a skew angle from a perpendicular line to the surface of the disc. Error rate in reproduced data read out by the pickup is determined, and an inferior disc having a rare error rate is eliminated.
Claims2
An apparatus for inspecting an optical disc on which digital data are recorded together with error detection and correction marks at every block, comprising:
- a spindle motor for rotating the optical disc;
- an optical pickup for emitting a laser beam for reading data recorded on the disc;
- the axis of the laser beam being tilted at a skew angle from a perpendicular line to the surface of the disc;
- detector means for detecting errors in reproduced data read out by the pickup in dependence on the error detection and correction marks;
- and
- determining means for determining an inferior disc based on the detected errors.
3 more elements
Dependencies are inferred from the claim text.