Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
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
Kushizaki Osami
Takasago Masahiro
Cardillo Raymond F.
Garland Steven R.
Hitachi , Ltd.
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