Defect detecting optical apparatus enabling recording in an alte

Details Defect detecting optical apparatus enabling recording in an alte Defect detecting optical apparatus enabling recording in an alte

1986-03-18

1988-03-08

Cardillo, Raymond F.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 46, 369 54, 369 58, G11B 2108, G11B 2736

Patent

active

047302909

ABSTRACT:
An optical recording/reproducing apparatus for recording and reproducing information along tracks on an optical disc by irradiating the optical disc with a laser beam comprises a tracking error detecting circuit for detecting the digression of the laser beam from the center line of each track and a level detector for detecting that the output of the tracking error detecting circuit exceeds a predetermined level. An operation for recording information in the optical disc by the laser beam is stopped when the output of the level detector takes a predetermined state indicating that the output of the tracking error detecting circuit exceeds the predetermined level, for a first predetermined time, and a signal indicating the occurrence of off-track is generated when the duration time of the predetermined state in the output of the level detector exceeds a second predetermined time which is longer than the first predetermined time.

REFERENCES:
patent: 4406000 (1983-09-01), Shoji et al.
patent: 4546462 (1985-10-01), Koishi et al.
patent: 4554652 (1985-11-01), Maeda et al.
patent: 4571716 (1986-02-01), Szerlip

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