Combustion – Illuminating flash device – e.g. – photographic bulb – etc. – Fuel charge within sealed transparent casing – e.g. – bulb
Patent
1979-10-19
1981-11-24
Dority, Jr, Carroll B.
Combustion
Illuminating flash device, e.g., photographic bulb, etc.
Fuel charge within sealed transparent casing, e.g., bulb
F21K 500
Patent
active
043021824
ABSTRACT:
A high-voltage type photoflash lamp having an ignition structure including an improved primer material for the reliable ignition of filamentary combustible material distributed within the oxygen-filled envelope of the lamp. The primer material comprises, a particulate fuel such as zirconium powder, an oxidizer salt such as potassium perchlorate, a binding agent such as nitrocellulose, a finely divided inert material such as fumed alumina, and an additive of conductive fibers for controlling breakdown voltage. A preferred additive comprises finely milled or chopped fibers of carbon or graphite.
REFERENCES:
patent: 3041862 (1962-07-01), Anderson et al.
patent: 3752636 (1973-08-01), Warninck
Coleman Edward J.
Dority, Jr Carroll B.
GTE Products Corporation
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