Photoflash lamp including improved ignition means

Details Photoflash lamp including improved ignition means Photoflash lamp including improved ignition means

1982-03-01

1984-02-21

Scott, Samuel

Combustion

Illuminating flash device, e.g., photographic bulb, etc.

Fuel charge within sealed transparent casing, e.g., bulb

431358, F21K 500

Patent

active

044327242

ABSTRACT:
An electrically-activated, subminiature photoflash lamp including a glass envelope, a quantity of combustible shred material (e.g., zirconium or hafnium) for providing high intensity light output upon ignition thereof, and an ignition means for igniting the combustible upon application of a suitable pulse such as typically provided by a piezoelectric element utilized in many of today's pocket-type cameras. The ignition means includes a first quantity of primer material located within a buttom of the lamp's envelope, a pair of lead-in wires secured within the bottom end of the envelope and in electrical contact with the primer, and a thin member located at an opposite end of the envelope from the first primer and having thereon a second quantity of primer material. The first primer, when ignited, thus serves to ignite a first end portion of the combustible shred material while substantially simultaneously igniting the spaced, second primer. This second primer in turn ignites the opposing end portion of the shred material such that this material burns from the opposing ends thereof toward the center to in turn assure both uniformity of burn and an accelerated rate thereof. In one example, the thin member comprised a cylindrical-shaped mica disk.

REFERENCES:
patent: 3220224 (1965-11-01), Baird
patent: 3220225 (1965-11-01), Baird
patent: 3310968 (1967-03-01), Buzalski
patent: 3332257 (1967-07-01), Gainer et al.
patent: 4229161 (1980-10-01), Bouchard et al.

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