Optical disc player

Details Optical disc player Optical disc player

1987-03-02

1988-02-02

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, G11B 382

Patent

active

047232340

ABSTRACT:
An optical disc player comprising a preliminary focus control circuit for repeatedly effecting preliminary focus control to bring a focusing control circuit arrangement for a beam of light falling on a disc into a mode of focus control operation, and detecting means for detecting an abnormal operation in the preliminary focus control, wherein an instance in which the disc is improperly loaded with the beam of light falling on a non-information-recorded surface thereof can be detected on the basis of an output signal from the detecting means.

REFERENCES:
patent: 3051795 (1962-08-01), Roberts et al.
patent: 3551608 (1970-12-01), Balint
patent: 4446546 (1984-05-01), Miller
patent: 4512003 (1985-04-01), Kimura et al.
patent: 4544837 (1985-10-01), Tanaka et al.

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