Combustion – Illuminating flash device – e.g. – photographic bulb – etc. – Fuel charge within sealed transparent casing – e.g. – bulb
Patent
1977-12-01
1980-01-08
Dority, Jr., Carroll B.
Combustion
Illuminating flash device, e.g., photographic bulb, etc.
Fuel charge within sealed transparent casing, e.g., bulb
362 11, 362 6, 362 15, F21K 502
Patent
active
041826078
ABSTRACT:
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.
REFERENCES:
patent: 3532931 (1970-10-01), Cote et al.
patent: 3969065 (1976-07-01), Smialek
patent: 3988647 (1976-10-01), Boloh et al.
patent: 3990832 (1976-11-01), Smialek et al.
patent: 3990833 (1976-11-01), Holub et al.
patent: 3994664 (1976-11-01), Cusano
patent: 4045712 (1977-08-01), De Tommasi
patent: 4080155 (1978-03-01), Sterling
patent: 4087233 (1978-05-01), Shaffer
patent: 4118758 (1978-10-01), Cusano et al.
Collins Edward J.
Sterling Vaughn C.
Dority Jr. Carroll B.
General Electric Company
Kempton Lawrence R.
McDevitt John F.
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