Appeal No. 95-3876
Application 08/222,009
While both modified circuits include a transistor Q3 like that
employed in the Figure 1 embodiment for turning off the IGBT
by grounding the gate thereof in response to the flash
terminating signal STOPL, neither includes a transistor like
transistor Q6 of Figure 1, which is also responsive to the
flash terminating signal STOPL.
While, as noted above, the description of the Figure
1 embodiment appears to credit only transistor Q3 with turning
off the IGBT, the description of the alternative embodiment
shown in Figure 7, which employs transistors Q3-Q6 in the3
same configuration as in Figure 1, appears to credit
transistors Q3 and Q6 with this function: "[W]hen an exposure
gets proper, the transistors Q3 and Q5 [sic, Q6?] are switched
on and the insulated gate bipolar transistor IGBT is switched
off to terminate the flash firing" (Spec. at 30:11-13).
Because, as explained infra, I do not understand appellants to
be making a § 112, ¶ 6 argument, it is not necessary to decide
whether or how the descriptions of the operation of
This embodiment includes an electroluminescent device3
EL in addition to a xenon flash tube Xe.
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