Combustion flashbulb

Details Combustion flashbulb Combustion flashbulb

1979-06-07

1982-12-14

Dority, Jr., Carroll B.

Combustion

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

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

431359, 431358, F21K 502

Patent

active

043636225

ABSTRACT:
Combustion flashbulbs according to the invention have a light-pervious lamp envelope (1) filled with a tangled mass (5) of actinically combustible metal strips and an oxidizing gas. Current supply conductors (2, 3) are coated on parts situated within the lamp envelope with a dispersion (4) of metal powder in binder. This dispersion (4) adheres strips of the mass (5) to the current conductors (2, 3).
The bulb can be ignited by a current pulse of approximately 25 V. Another method of igniting is to produce breakdown by applying a short-lasting voltage of approximately 25 V across the conductors (2, 3), afterwards succeeded by a filament current having a voltage of approximately 10 V. If the metal in the dispersion (4) is a nobler metal, the bulbs can be ignited with a current source of 10 V without preceding breakdown.
The bulbs are simple of construction, rapid, and give a short-lasting lightflash.

REFERENCES:
patent: 3501254 (1970-03-01), Nijland et al.
patent: 3884615 (1975-05-01), Sobieski
patent: 4101260 (1978-07-01), Wanninkhof
patent: 4128858 (1978-12-01), Sterling et al.
patent: 4133630 (1979-01-01), Vreeswijk et al.
patent: 4174944 (1979-11-01), Newell et al.
patent: 4190413 (1980-02-01), Shaffer et al.
patent: 4204834 (1980-05-01), Fohl

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