Switching devices for photoflash unit

Details Switching devices for photoflash unit Switching devices for photoflash unit

H - Electricity

05

K

31/104, 315/17

H05K 1/00 (2006.01) G03B 15/04 (2006.01)

Patent

CA 1059480

ABSTRACT OF THE DISCLOSURE A multiple flashlamp array is disclosed having a plurality of lamps fired individually and in sequence which includes a plurality of static solid switching devices capable of being easily activated by radiant energy generated during flashing of the lamps. Initially, the switches have a high resistance ("off position") and after being activated by radiation, they undergo chemical conversion to a conductive stats ("on position"). The switches are prepared from compos- itions which impart improved shelf life under conditions of relatively high humidity at above normal ambient temperatures. The switch material composition comprises a mixture of a solid copper salt with a humidity resistant organic polymer binder and a finely divided metal reducing agents.

238796

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