Halogen incandescent lamp

Details Halogen incandescent lamp Halogen incandescent lamp

1979-12-14

1981-12-08

Krawczewicz, Stanley T.

Electric lamp and discharge devices

Liquid electrode discharge devices

Auxiliary starting or holding electrode

313178, 313222, H01J 1968

Patent

active

043050174

ABSTRACT:
A halogen incandescent lamp having a light-pervious envelope containing a gas filling comprising a rare gas, hydrogen and bromine. The envelope also contains a tungsten filament and an oxygen getter. The oxygen getter consists of an intermetallic compound of at least one first metal from the group consisting of Ta, Ti, Zr, Hf and Nb and at least one second metal from the group consisting of Pd, Pt and Au, but which intermetallic compound is not a tantalum-gold or a niobium-gold compound.
These intermetallic compounds are sufficiently stable that although they react with oxygen, they do not react with hydrogen bromide.
Consequently the presence of such an intermetallic compound in such a halogen incandescent lamp does not interfere with the tungsten-bromine cycle, and thus the maximum quantity of the intermetallic compound which is present in such a lamp is not critical.

REFERENCES:
patent: 3829731 (1974-08-01), T'Jampens et al.
patent: 4039879 (1977-08-01), T'Jampens et al.
patent: 4074167 (1978-02-01), Broek et al.

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