H - Electricity – 05 – B
Patent
H - Electricity
05
B
31/104, 315/17
H05B 41/34 (2006.01) G03B 15/04 (2006.01) H01H 37/74 (2006.01)
Patent
CA 1123042
RADIATION SWITCH FOR PHOTOFLASH UNIT ABSTRACT OF THE DISCLOSURE A photoflash unit having a plurality of high voltage type flashlamps mounted in a planar array on a printed circuit board containing circuitry for sequentially igniting the flash lamps in response to successive high voltage firing pulses applied thereto. The circuitry includes a plurality of solid state switches capable of being easily activated by radiant energy generated during flashing of the lamps. Initially, the switches have a high resistance, and after being activated by radiation, they undergo chemical conversion to a conductive state. The switches are prepared from compositions particularly resistant to high relative humidity and above normal ambient temperatures, The switch material composition comprises silver carbonate, a binder such as polystyrene resin, and an oxidizer such as barium chromate.
287026
Gte Sylvania Incorporated
R. William Wray & Associates
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