Low wattage double filament tungsten-halogen lamp

Details Low wattage double filament tungsten-halogen lamp Low wattage double filament tungsten-halogen lamp

1984-07-09

1986-07-01

Argenbright, Tony M.

Illumination

Multiple filament light unit

Relatively movable light source or modifier

313273, 362277, F21M 320, H01J 188

Patent

active

045983429

ABSTRACT:
A low wattage tungsten-halogen lamp with an improved filament construction comprising a pair of selectively activated filaments, each having a plurality of coil turns, being intercoupled by a relatively short intermediate member. Preferably, both of the filaments and the intermediate member are formed from a single wire. The spacing between turns of each filament is greater about the central portion of the filament than at the opposed end portions thereof, thereby enhancing visible radiation. Xenon gas, at a pressure of fifteen atmospheres, is preferably used as the inert gas fill for the lamp due to its low thermal conductivity.

REFERENCES:
patent: 2227294 (1940-12-01), Brody
patent: 2947851 (1960-08-01), Lozeau
patent: 3579021 (1971-05-01), Kimball
patent: 3665240 (1972-05-01), Archer
patent: 4414484 (1983-11-01), Notelteirs et al.
patent: 4463277 (1984-07-01), DeCaro

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