Appeal No. 95-4547
Application No. 08/097,697
shock and means for detecting defects in the reproduced data signal
using envelope detection and that Anderson teaches the generation of
supplemental position error signal values from a plurality of
locations around a rotation of a disk. Therefore, concludes the
examiner, it would have been obvious
to have modified the servo control apparatus
of Ohtake...such that the memory would hold
servo signals from an entire rotation of the
disk, as taught by Anderson...in order to
achieve a high degree of accuracy in head
positioning around an entire rotation of a
disk during operation [answer, page 5].
The examiner further concludes that since Baba teaches a first and
second detection means for detecting surface defects and external
shock, respectively, that it would have been obvious
to have incorporated the data signal defect
detection means and the external shock
detection means as taught by Baba...into the
apparatus taught by the combination of
Ohtake...and Anderson...in order to provide
a means for maintaining accurate tracking
control when detection errors occur during
data reproduction, due to surface defects of
the disc, and when external shocks to the
optical head are encountered, by providing
additional control signals to the memory
hold circuit of Ohtake...[answer, page 6].
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Last modified: November 3, 2007