Defect detecting optical apparatus enabling recording in an alte

Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium

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Details

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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