Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-03-19
1991-08-20
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 58, 360 7704, G11B 7095
Patent
active
050420216
ABSTRACT:
An optical disc apparatus includes a tracking device which positions the beam light on the recording track of an optical disc in order to carry out at least recording or reproducing of information by moving the beam light in the radial direction of the optical disc, and a detection device for obtaining a position deviation signal of the beam light by receiving reflected light from the surface of the optical disc. In addition, the apparatus includes an optical head which carries out recording or reproducing of information for the recording track of the optical disc, a control device which controls the tracking device in response to the position deviation signal obtained from the detection device, a first device which reads, prior to an actual operation of recording or reproducing, a position deviation signal from the detection device, and stores the resulting data in a memory as eccentricity correction data for the recording track, and a second device which transfers, when actually carrying out recording or reproducing operation, the eccentricity correction data memorized in the memory to the D/A converter and gives the output of the D/A converter to the tracking control device. The D/A converter converts the digital quantity read from the memory to an analog signal, and the analog signal may be applied to a device for driving the optical head.
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Nagano Katsumi
Watanabe Hiroshi
Kabushiki Kaisha Toshiba
Richardson Robert L.
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