Optical disc device and optical disc discriminating method

Details Optical disc device and optical disc discriminating method Optical disc device and optical disc discriminating method

1998-01-07

2000-11-14

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

Patent

active

061479411

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 reflected light radiated from the laser light source and reflected from the signal surface of the optical disc, a disc discriminating unit for discriminating the type of the optical disc based on a detection output of the return light detection unit, a unit for detecting tracking error signals of plural different types of different detection systems based on the detection output of the return light detection unit, a tracking unit for 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 focussed on the signal surface of the optical disc and a controlling unit for switching the detection system based on a discriminating output by the disc discriminating unit for selecting one of the plural types of the tracking error signals responsive to the types of the optical discs.

REFERENCES:
patent: 5592448 (1997-01-01), Suzuki et al.
patent: 5636196 (1997-06-01), Kumagai
patent: 5703852 (1997-12-01), Kumagai
patent: 5724325 (1998-03-01), Jeong

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