Appeal No. 96-1895
Application 08/011,682
track following (position control) operations in Kanda
correspond to the claimed "settling operation." Kanda has a
phase compensation circuit (PCC) 31, the purpose of which is
described as follows (col. 2, lines 25-30): "The phase
compensation circuit is composed of a filter, such as a
notch filter and lead lag filter, and adapted to suppress a
resonance point in a mechanical system, such as a carriage
and to prevent an oscillation phenomenon resulting from a
phase delay." Thus, PCC 31 serves the same purpose as
appellant's low pass filter.
The question is whether the PCC 31 in Kanda is turned
OFF and ON as recited in the claims. Kanda discloses
(col. 4, lines 54-66):
A fifth switching circuit 36 is turned ON at a time of
track following operation and delivers the position
signal PS from the position signal generator 20 to the
integrating circuit 30. An integrating circuit 30
integrates the position signal PS from the position
signal generator 20 to deliver a result of integration
to a PCC (phase compensation circuit) 31. PCC31 [sic]
is composed of a filter, such as a notch filter and a
lead lag filter. A third switching circuit 32 is
turned ON at a time of track following operation to
supply a compensated replica of the position signal
coming from PCC31 [sic] to the motor driving circuit
27.
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