Optical information recording apparatus with eccentricity correc

Details Optical information recording apparatus with eccentricity correc Optical information recording apparatus with eccentricity correc

1986-07-29

1988-10-04

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

358342, 360 77, G11B 2110

Patent

active

047759666

ABSTRACT:
An optical information reproducing apparatus wherein a light spot is projected on a rotary disc on which information is recorded, thereby to reproduce the information recorded on the disc, is provided with detection means to detect an amount of eccentricity of the disc by counting a number of tracks on the disc which the light spot at rest traverses when the disc is rotated by one revolution, and eccentricity correction signal generation means to generate a sinusoidal wave signal whose amplitude is determined by the detected amount of eccentricity and whose period is determined by a rotational period of the disc.
The position of the light spot is controlled in accordance with the sinusoidal wave signal and a tracking control signal.

REFERENCES:
patent: 4205338 (1980-05-01), Schaefer
patent: 4365324 (1982-12-01), Michaelis
patent: 4527263 (1985-07-01), Nakagawa

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