High pressure electric discharge device with hafnium getter

Details High pressure electric discharge device with hafnium getter High pressure electric discharge device with hafnium getter

1974-11-22

1976-03-23

Rolinec, R. V.

Electric lamp and discharge devices

Liquid electrode discharge devices

Auxiliary starting or holding electrode

313224, 313229, H01J 6124

Patent

active

039462625

ABSTRACT:
A thin foil of hafnium or a hafnium alloy is disposed within a high pressure metal halide discharge lamp for selectively gettering any hydrogen contaminant within the lamp. In one embodiment a long strip of hafnium foil is welded along the current return wire which extends from the remote end of the arc tube to the base of the lamp, while in another embodiment, bowed-out strips are welded to support straps on each of the arc tube press seals. In this manner, a significant portion of the hafnium getter is disposed in a location where it is subjected to operating temperatures lower than about 330.degree.C.

REFERENCES:
patent: 3549937 (1970-12-01), Hanada et al.
patent: 3821585 (1974-06-01), Jansson et al.
patent: 3829731 (1974-08-01), T'Jampens et al.

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