Switching devices for photoflash unit

Details Switching devices for photoflash unit Switching devices for photoflash unit

1974-05-24

1976-04-20

Camby, John J.

Combustion

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

252501, 337413, 200 612, 240 13, 431 95A, F21K 502, G03B 1504

Patent

active

039515826

ABSTRACT:
A photoflash unit is designed to have a plurality of lamps fired individually and in sequence 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" position) and after being activated by radiation, they undergo a chemical change to a conductive state ("on" position). The switches are prepared from compositions which impart improved shelf life under conditions of high relative humidity and include a light absorbing, heat transmitting protective coating having absorption characteristics in the range of 3000-5500 A.

REFERENCES:
patent: 2762889 (1956-09-01), Waller
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
patent: 3751656 (1973-08-01), Buckler et al.

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