Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1998-01-07
1999-12-21
Huber, Paul W.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, 369 58, G11B 700, G11B 390
Patent
active
060058323
ABSTRACT:
An optical disc device includes a laser light source for radiating a laser light beam illuminated via an objective lens on a signal surface of an optical disc, a return light detection unit for detecting the return light radiated from the laser light source and reflected by the signal surface of the optical disc by a photodetector split into at least four segments, a disc discriminating unit for discriminating the disc type based on a detection output of the return light detection unit, a tracking controlling unit for generating tracking error signals based on the phase difference between detection signals A, B, C and D of the photodetector, displacing the objective lens along the radius of the optical disc responsive to the tracking error signals for tracking-controlling a laser spot of the laser light beam on the signal surface of the optical disc and a controlling unit for switching operating characteristics of the tracking controlling unit depending on the disc type based on a discriminating output of the disc discriminating unit.
REFERENCES:
patent: 5724325 (1998-03-01), Jeong
Huber Paul W.
Sony Corporation
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