H - Electricity – 05 – K
Patent
H - Electricity
05
K
67/6
H05K 1/00 (2006.01) G03B 15/04 (2006.01)
Patent
CA 1107526
LD 7501 ABSTRACT OF THE DISCLOSURE Radiation sensitive switching elements which undergo thermal decomposition to interrupt a circuit path when activated are operatively associated with a plurality of high-voltage type flash lamps. The lamps use a primer material which short-circuits after flashing to provide an electrical path across the lamps. The combined actions of the open-circuiting switching elements and the short- circuiting lamps enable the flash lamps to be flashed sequentially in a high-voltage activated multiple flash lamp array. The thermal decomposition of the radiation sensitive switching elements produces self-destruction of the switch elements per se. The thermal decomposition can be accom- panied by further destruction of the underlying substrate on which the switch elements have been deposited. The switching elements are deposited on a circuit board member and electrically connected in the sequential lamp firing circuitry at circuit board locations adjacent to the associated flash lamps. The desired thermal action accompanying switch operation is enhanced in a preferred embodiment by constructing the circuit board from an organic polymer material which melts or decomposes and locating the switching elements at circuit locations wherein the underlying substrate has a thickness less than the substrate thickness elsewhere in order to produce holes in the circuit board member itself as the means of permanently interrupting the electrical path.
307395
Cusano Dominic A.
Webster Harold F.
Company General Electric
Eckersley Raymond A.
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