Combustion flash bulb

Details Combustion flash bulb Combustion flash bulb

1980-04-18

1983-06-14

Scott, Samuel

Combustion

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

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

F21K 502

Patent

active

043880657

ABSTRACT:
High voltage-ignited combustion flash bulbs according to the invention have a first current conductor which extends into a mass of metal strips. The first current conductor is connected inside the envelope to a second current conductor 4 by means of an ignition mass. A porous mass of an electrically insulating material is provided between the second current conductor and the mass of metal strips. The material 8 at least reduces the possibility of failing ignition caused by the ignition current flowing from the first current conductor, via the mass of metal strips, through the ignition mass, to the second current conductor, instead of from the first current conductor, via a longer path through the ignition mass to the second current conductor.
The flash bulb may be incorporated in a flash unit having several such flash bulbs.

REFERENCES:
patent: 2490769 (1949-12-01), Andrea
patent: 3884615 (1975-05-01), Sobieski
patent: 3930784 (1976-01-01), Anderson
patent: 4049369 (1977-09-01), Shaffer
patent: 4082494 (1978-04-01), Shaffer
patent: 4229161 (1980-10-01), Bouchard et al.

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