H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/17
H05B 41/34 (2006.01) G03B 15/04 (2006.01)
Patent
CA 1123486
LD 7578 PHOTOFLASH LAMP UNIT UTILIZING RADIATION AND VOLTAGE RESPONSIVE SWITCH DEVICES ABSTRACT OF THE DISCLOSURE A photoflash lamp unit is described having a plurality of flash lamps fired individually and in sequence to include a. plurality of switching devices each connected in the electrical circuit so as to interrupt the circuit path to a lamp that is flashed in response to the radiation emitted therefrom but still provide a circuit path to other unflashed lamps in the electrical circuit. In this manner, the desired firing sequence can be carried out although a particular flash lamp in the electrical circuit fails to fire because of defects other than a before-flash shorted condition and a more reliable switching arrangement is thereby provided. The construction of said individual combined radiation and voltage responsive switch device comprises a mass of switch material connected in the electrical circuit across spaced apart electrical terminals and which is disposed to receive radiant energy emitted by an associated lamp primarily in a predetermined region of the switch body for thermochemical decomposition: in said region. Another region in the mass of switch material is simultaneously converted to provide a low resistance path in the electrical circuit.
314834
Collins Edward J.
Sterling Vaughn C.
Company General Electric
Eckersley Raymond A.
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