Switching devices for photoflash unit

Details Switching devices for photoflash unit Switching devices for photoflash unit

F - Mech Eng,Light,Heat,Weapons

21

K

31/104, 315/17

F21K 5/02 (1980.01)

Patent

CA 1063187

SWITCHING DEVICES FOR PHOTOFLASH UNIT 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 state ("on position"). The switches are prepared from compo- sitions which impart improved shelf life under conditions of relatively high humidity at above normal ambient temperatures. The switch material composition comprises a mixture of finely divided cupric oxide with a humidity resistant organic polymer binder.

244920

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