Radiation switch for photoflash unit

Details Radiation switch for photoflash unit Radiation switch for photoflash unit

1976-10-18

1978-05-02

Dority, Jr., Carroll B.

Combustion

Projector and igniter for liquid or gelled fuel slug or rod,...

252518, 362 6, 362 13, F21K 502

Patent

active

040872335

ABSTRACT:
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.

REFERENCES:
patent: 3459488 (1969-08-01), Schroder et al.
patent: 3951582 (1976-04-01), Holub et al.
patent: 3990832 (1976-11-01), Smialek et al.
patent: 3990833 (1976-11-01), Holub et al.

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