Electrically-activated photoflash lamp excluding a press-sealed

Details Electrically-activated photoflash lamp excluding a press-sealed Electrically-activated photoflash lamp excluding a press-sealed

1982-09-28

1984-07-03

Barrett, Lee E.

Combustion

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

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

F21K 502

Patent

active

044577001

ABSTRACT:
An electrically-activated photoflash lamp which includes a lead glass envelope, a quantity of shredded zirconium or hafnium combustible material within the envelope, a combustion-supporting gas (e.g., oxygen) also within the envelope, and an ignition structure disposed within the envelope for igniting the combustible material upon application of a high voltage, low energy pulse thereto. The ignition structure includes a pair of metallic lead wires secured within one end of the envelope and having terminations which lie substantially flush with the interior surface of this end. A quantity of primer material bridges the terminations and is ignited upon application of the above pulse. The lead wires are secured and hermetically sealed within the envelope's end without the need for a press sealing operation. A method of making this lamp is also provided.

REFERENCES:
patent: 2235515 (1941-03-01), Carpenter
patent: 2428059 (1947-09-01), Wolfson et al.
patent: 3178796 (1965-04-01), Smits
patent: 3312085 (1967-04-01), Schilling et al.
patent: 3602619 (1971-08-01), Van der Tas et al.
patent: 4097220 (1978-06-01), Cote et al.
patent: 4133630 (1979-01-01), Vreeswijk et al.
patent: 4270897 (1981-06-01), Armstrong et al.

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