Optical information read apparatus

Details Optical information read apparatus Optical information read apparatus

1986-03-06

1988-04-26

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 369 54, 250202, G11B 7095

Patent

active

047409401

ABSTRACT:
An optical information read apparatus for optically reading information recorded on a recording medium includes an optical head for producing two detected signals whose phases vary according to a tracking error of the head, and a tracking error detecting circuit for producing a tracking error signal corresponding to a phase difference between the two detected signals, and a tracking controller for controlling the optical head in response to the tracking error signal. The tracking error detecting circuit has a correlation test circuit for checking a correlation between the states of the two detected signals, and for making the tracking error signal substantially invalid when there is no correlation between the states of the two detected signals. Thus, a stable tracking control can be performed.

REFERENCES:
patent: 4006293 (1977-02-01), Bouwhuis
patent: 4051527 (1977-09-01), Braat
patent: 4057833 (1977-11-01), Braat
patent: 4059841 (1977-11-01), Bricot
patent: 4193091 (1980-03-01), Kleuters
patent: 4467462 (1984-08-01), Shibato
patent: 4497048 (1985-01-01), Kimura
patent: 4541082 (1985-09-01), Horikoshi

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