Tracking servo apparatus for an optical information reproducing

Details Tracking servo apparatus for an optical information reproducing Tracking servo apparatus for an optical information reproducing

1983-09-26

1984-10-09

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 96, 250202, G11B 2110

Patent

active

044765550

ABSTRACT:
A tracking control apparatus for use with an optical information reproducing system in which information to be reproduced is formed on a surface of a recording carrier with a substantially circular record track, and a light beam is incident on the surface for reading the information, the apparatus including a photo-detector for detecting the light beam reflected from the recording carrier and generating an information signal and a first tracking error signal, the first tracking error signal being responsive to deviations by the light beam from the center of the record track; a tracking control apparatus receiving the first tracking error signal for adjusting the position of the light beam in response thereto; a measuring device for generating a second tracking error signal indicative of the eccentricity of the record track; and a circuit for supplying the second tracking error signal to the tracking control apparatus to adjust the position of the light beam in response thereto.

REFERENCES:
patent: 4037252 (1977-07-01), Janssen
patent: 4067044 (1978-01-01), Maeda
patent: 4205338 (1980-05-01), Schaefer

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