Appeal No. 1997-4446
Application No. 08/278,151
repeatedly applying a supply voltage signal from memory,
controlling the head position, obtaining a new tracking error
signal, and storing the improved supply voltage signal until
the process converges to a tracking error shift of zero. When
the ideal supply voltage signal is found, it is written in the
ROM of the device. Yamashita does not utilize a supply
voltage signal obtained for one head for driving a second
head. The portion of column 2 of Yamashita referenced by the
examiner as a motivation to combine is directed to reasons for
determining an appropriate signal for a single head, but not
for applying the obtained signal to a second head. Therefore,
Yamashita cannot suggest modifying AAPA to use the control
signal obtained for a first actuator to drive a second
actuator.
The examiner argues (Answer page 4) that
the skilled artisan would look to Yamashita because
the AAPA closed loop control system is expensive.
By applying an open loop system as taught by
Yamashita to a second head, using the accurate
closed loop signals from the first head, provided by
AAPA, the overall system would have reduced cost
compared to AAPA with two closed loops for two
heads.
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