Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1989-10-11
1991-12-31
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4435, G11B 700
Patent
active
050777181
ABSTRACT:
An optical information processing apparatus includes a device for scanning tracks formed on an optical recording medium by a light beam, a device for moving the applied position of the light beam in a direction across the tracks, a device for detecting a tracking error signal indicative of the deviation between the applied position of the light beam and the tracks, a tracking servo device for feeding the tracking error signal back to the moving means, a switching device for selectively rendering the tracking servo device operative or inoperative, and a control device for measuring the time for which the tracking error signal exceeds a predetermined level, and switching the tracking servo device from its inoperative state to its operative state by the switching device after the aforementioned time exceeds a predetermined time.
REFERENCES:
patent: 4730290 (1988-03-01), Takasago et al.
patent: 4764860 (1988-08-01), Takao
patent: 4912697 (1990-03-01), Enari et al.
patent: 4982393 (1991-01-01), Matsushita et al.
patent: 5010534 (1991-04-01), Enari et al.
Canon Kabushiki Kaisha
Richardson Robert L.
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