G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/08 (2006.01) G11B 7/095 (2006.01)
Patent
CA 1154163
ABSTRACT OF THE DISCLOSURE A tracking servo apparatus for an optical information reproducing system in which a light beam for reading out an information is incident on a signal record surface of a recording carrier on which a substantially circular record track is formed is disclosed. In the apparatus there are provided a photo-detector for detecting the light beam reflected on the recording carrier and for generating an information signal and a first tracking error signal responsive to variations of the distibution of diffracted beam caused by the deviations of beam position relative to the center of the record track; a tracking control circuit supplied with the first tracking error signal and controlling the light beam; a measuring circuit for measuring a second tracking error due to the eccentricity of the recording carrier during at least one revolution of the recording carrier; a memory for memorizing the second tracking error; and a circuit injecting the second tracking error signal read out from the memory to a tracking servo loop during the normal reproducing operation.
385567
Joichi Yoshiro
Ohki Hiroshi
Gowling Lafleur Henderson Llp
Sony Corporation
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