Halogen incandescent lamp
AssigneeU.S. Philips Corporation
InventorHermanus Brons
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Abstract
In halogen incandescent lamps with bromine as the halogen and having a tantalum getter to absorb any free oxygen, the getter also absorbs bromine at high operating temperatures and affects the tungsten-bromine cycle adversely. Tantalum alloyed with tungsten in a weight ratio range of 9/1 to 1/9 has a very much larger affinity to oxygen than it has to bromine. As a result of this the alloys are excellently suitable for use as an oxygen getter in tungsten/bromine cycle lamps.
Claims1
A halogen incandescent lamp having a light-pervious, vacuum-tight sealed lamp envelope which is filled with an inert gas containing hydrogen bromide, in which lamp a tungsten filament is accommodated between current supply conductors which pass through the wall of the lamp envelope and in which envelope tantalum is present as an oxygen getter, characterized in that the oxygen getter consists of tantalum which is alloyed with tungsten in a weight ratio in the range 1/9 to 9/1.
Dependencies are inferred from the claim text.