Appeal No. 96-1895
Application 08/011,682
figure 13, to turn the low pass filter OFF during a seek
operation and ON during a settling operation.
Claim 1 is reproduced below.
1. A positioning control system comprising:
a controlled device which has resonance
characteristics, including resonance frequencies, and
is positionable at a designated position;
position detecting means for detecting a moved
position of the controlled device;
arithmetic control means for generating a drive
signal based on a position detection signal from the
position detecting means and based on said designated
position; and
drive means for moving the controlled device in
accordance with said drive signal from said arithmetic
control means,
said arithmetic control means includes a low pass
filter which has an abrupt slope and a discontinuous
pole in the gain-frequency characteristics thereof, so
that said resonance frequencies of said controlled
device can be suppressed by means of said low pass
filter, said arithmetic control means further
comprising switch means for selectively turning said
low pass filter off and on
wherein said switch means selectively turns said
low pass filter off during a seek operation of said
controlled device and on during a settling operation of
said controlled device and wherein said lowpass [sic]
filter comprises a notch filter having said abrupt
slope for suppressing a lowest resonance frequency and
an elliptical function filter having said pole for
suppressing a second lowest, or higher, resonance
frequency.
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Last modified: November 3, 2007