Switching devices for photoflash unit

Details Switching devices for photoflash unit Switching devices for photoflash unit

1975-09-29

1976-11-09

Dority, Jr., Carroll B.

Combustion

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

240 13, 252506, 252510, 252514, 252518, 337416, F21K 502, H01B 102

Patent

active

039908330

ABSTRACT:
A photoflash unit is designed to have a plurality of lamps fired individually and in sequence and includes a plurality of switching devices capable of being easily activated by radiant energy generated during flashing of the lamps. Initially, the switches have a high resistance ("off" condition) and after being activated by radiation, they undergo a chemical change to a conductive state ("on" condition). The switches are prepared from compositions which impart improved shelf life to the switches under conditions of high relative humidity.

REFERENCES:
patent: 3297846 (1967-01-01), Peltier
patent: 3451813 (1969-06-01), Kinney et al.
patent: 3458270 (1969-07-01), Ganser et al.
patent: 3459488 (1969-08-01), Schroder et al.
patent: 3573230 (1971-03-01), Van Voorhees

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