Appeal No. 96-1895
Application 08/011,682
This is a decision on appeal under 35 U.S.C. § 134 from
the final rejection of claims 1, 4, and 6-14.
We reverse.
BACKGROUND
The disclosed invention is directed to a positioning
control system for positioning a device which has mechanical
resonance characteristics, such as a magnetic head of a
magnetic disk drive. The control system has an arithmetic
control means for generating a drive signal based on a
position signal from a position detecting means, which
includes a low pass filter for suppressing the resonance
frequencies of the device. In the past, as shown in
appellant's figure 3, filters have used a notch filter group
comprising a number of notch filters connected in cascade to
eliminate many mechanical resonances simultaneously
(specification, page 8). Appellant's invention, as shown in
figure 6, has an arithmetic control means 3 with a low pass
filter 7 comprising a notch filter 5 and an elliptic
function filter 6 "which replace the notch filter group of
the prior art" (specification, page 13, lines 21-22, as
amended). Appellant also uses a switch, as shown in
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