Appeal No. 2002-0587 Page 12
Application No. 08/922,300
If the power supply to the display device is
interrupted during the operation of the display
device, the H/V processor constant voltage circuit
operates no longer due to interruption of the voltage.
As a result, the H/V processor operates no longer, as
well. As the H/V processor operates no longer, it
outputs no pulse signal thereby causing the high voltage
charged on the horizontal deflection coil and S-correction
capacitor not to be discharged. As a result, a voltage of
about +120 to 160 V remains.
Thus, the admitted prior art recognizes that when the power
supply is interrupted, the high voltage charged on the horizontal
deflection coil is not discharged. As discussed above, Martin
teaches (col. 3, lines 55-59) that “[w]hen it is necessary to
protect the screen 16, the transistor 58 is turned on and
additional current is drawn through the coil of the horizontal
deflection yoke 17 so as to drive the beam off the screen.”
Thus, we find that it is the combined teachings of the admitted
prior art and Martin which suggests the combination of the
admitted prior art and Martin.
It is further argued (reply brief, page 9) that X drive 99
in figure 2 of Martin is an AC source which provides a voltage to
horizontal deflection circuit 23 of Martin, and that Martin does
not suggest gradually lowering the input voltage to X drive 99 if
a power failure occurs. We find that in Martin, horizontal
deflection circuit 23 operates during normal operation of the
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