Combustion flashbulb

Details Combustion flashbulb Combustion flashbulb

1978-12-11

1982-01-05

Ward, Jr., Robert S.

Combustion

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

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

362 13, F21K 502, H05B 4302

Patent

active

043091660

ABSTRACT:
A flashbulb in which a filament and paste are not required. The flashbulb is not only cheaper but is faster in operation. This is primarily achieved by ensuring that the mass of finely-shredded combustible metal strips provided in such flashbulbs are in contact with the lead-in current conductors in the bulb. Due to the oxidizing atmosphere, the strips have an electrically-insulating skin. It has been found that this skin can readily be broken down by the momentary application of a voltage, whereupon the strips form a current-conducting path between the electrodes and ignition can then be affected with a voltage lower than the breakdown voltage.

REFERENCES:
patent: 2768517 (1956-10-01), Atkinson et al.
patent: 2868003 (1959-01-01), Albrecht
patent: 3045460 (1962-07-01), Brouse et al.
patent: 3312085 (1967-04-01), Schilling et al.
patent: 3500732 (1970-03-01), Nijland et al.
patent: 3532931 (1970-10-01), Cote et al.
patent: 3694696 (1972-09-01), Laskowski
patent: 3694697 (1972-09-01), Kim
patent: 3884615 (1975-05-01), Sobieski
patent: 3904348 (1975-09-01), Bouchard et al.

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