Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1991-11-06
1992-08-11
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4435, 369 4436, G11B 700
Patent
active
051385961
ABSTRACT:
An optical information recording apparatus according to the present invention prevents the saturation of an output of an amplifier, and thereby effects stable tracking and/or focusing servo. The recording apparatus includes a device for inputting an input signal modulated between at least two levels which are not zero in accordance with recording information, a device for converging a light beam intensity modulated between at least two levels which are not zero into a spot-like shape in accordance with the input signal, for scanning a recording medium, and for recording the information, a device for detecting a signal indicative of a positional error between the light beam spot and the medium in at least one of a focusing direction and a tracking direction, a servo device for correcting the positional error on the basis of the detected signal, a device for changing a gain of the servo in accordance with an intensity level of the light beam, and a device for delaying the gain by a predetermined time corresponding to a time period for a change in the level of the input signal from a higher level to a lower level.
REFERENCES:
patent: 4742505 (1988-05-01), Takeuchi et al.
patent: 4817077 (1989-03-01), Ono
patent: 4890273 (1989-12-01), Takeuchi et al.
patent: 4912697 (1990-03-01), Enari et al.
Canon Kabushiki Kaisha
Richardson Robert L.
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