Eccentricity control device

Details Eccentricity control device Eccentricity control device

1980-11-19

1982-12-21

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

360 77, 250202, 318577, G11B 2110, G11B 700

Patent

active

043653243

ABSTRACT:
Eccentricity control apparatus is provided in a system for optically recording and reading information on a rotating disc medium. The information may be recorded on concentric or spiral tracks. The eccentricity control apparatus includes a detector for detecting track crossings as an optical scanning head scans the disc surface. The detector provides pulses representative of track crossings. The number of pulses in a once-around is representative of the amplitude of an eccentricity control signal. The angle measured between a once-around pulse and a minimum pulse rate of the track crossings indicates the phase of the error. An eccentricity error signal which is generated by suitable circuitry is applied to affect the manner in which the optical scanning head scans the disc surface such that number of track crossings is reduced.

REFERENCES:
patent: 3876827 (1975-04-01), Janssen
patent: 4067044 (1978-01-01), Maeda
patent: 4138741 (1979-02-01), Hedlund
patent: 4160270 (1979-07-01), Goldschmidt
patent: 4222071 (1980-09-01), Bell

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