Information recording and/or reproducing apparatus provided with

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

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G11B 700

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active

049823930

ABSTRACT:
An apparatus for applying a light beam to an optical recording medium having tracks provided thereon and effecting at least one of recording and reproduction of information includes a light source emitting the light beam, an optical system for directing the light beam emitted from the light source to the medium, a device for receiving the light flux reflected by or transmitted through the medium and detecting a tracking error signal indicative of the deviation between the applied position of the light beam and a track, a tracking servo for moving at least a portion of the optical system on the basis of the tracking error signal and correcting the applied position of the light beam, a detector for detecting abnormality of tracking servo from the velocity of the moved portion of the optical system.

REFERENCES:
patent: 4554465 (1985-11-01), Maeda et al.
patent: 4692915 (1987-09-01), Moriya et al.
patent: 4703468 (1987-10-01), Baba et al.
patent: 4764860 (1988-08-01), Takao
patent: 4788421 (1988-11-01), Ogawa et al.
patent: 4912697 (1990-03-01), Enari et al.

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