Appeal No. 2001-0294
Application No. 09/004,399
voltage output to be compared with the voltage output of bias
means 88 and causes comparator means 90 to send a control signal
to switch 86 for applying the dc braking current to the motor
(col. 6, lines 43-57). However, Davie relies on electrical
outputs of the speed sensing circuit and the bias means for
determining the speed of the motor and provides no teaching
related to using clock pulses.
Aoshima, on the other hand, relates to a disc motor control
for achieving stable rotation and avoiding undesirable stopping
of the motor (col. 2, lines 22-31). To maintain a higher
accuracy of motor speed, Aoshima, as depicted in figure 8,
provides for pulse counters that determine the speed of the motor
and apply acceleration or deceleration signals to a brake circuit
to speed up or slow down the motor rotation, not to brake the
motor to a stop (col. 11, line 31 through col. 12, line 41). We
also note that although Aoshima provides another embodiment
related to braking the motor and refers to clock pulses for
determining the speed of motor (col. 16, lines 48-56), the speed
detection is used for determining the direction of motor rotation
(col. 18, lines 51-60) instead of braking. A comparator detects
the direction of the rotation so that acceleration to further
speed up the motor or reverse rotation can be avoided and the
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