Tungsten halogen lamp with halogen-containing compound and silicon-containing compound
AssigneeGeneral Electric Company
InventorsThomas H. Yu, Shailesh R. Sheth, Gino Savarino, Bart P. Terburg
Life of this patent
Estimating the term…
Abstract
A tungsten halogen lamp (10) includes a light transmissive envelope (12), which encloses a tungsten filament (14) and a gaseous fill comprising an inert gas and a halogen-containing gas, such as an alkyl halide. In addition the fill includes a silicon-containing compound capable of gettering oxygen within the envelope. The atomic ratio of silicon to halogen in the envelope is selected so as to remove most, but not all of the oxygen present in the envelope A silicon:halogen ratio of less than about 0.5 more preferably, below about 0.4 has been found to be effective in this respect.
Claims17
A lamp comprising:
- a hermetically sealed, light transmissive envelope;
- a tungsten filament within the envelope;
- and
- a mixture of inert gas, a halogen-containing compound, and a silicon-containing compound for gettering oxygen within the envelope, wherein the atomic ratio of silicon to halogen in the mixture is from 0.1 to about 0.5.
A lamp comprising:
- a hermetically sealed, light transmissive envelope;
- a tungsten filament within the envelope;
- and
- a mixture of inert gas, a halogen-containing compound, and a silicon-containing compound for gettering oxygen within the envelope, wherein the silicon-containing compound is present in a sufficient amount to maintain a lumen per watt efficiency of at least 60% of that of an equivalent lamp formed without a silicon-containing compound.
A lamp comprising:
- a light transmissive envelope;
- at least one filament within the envelope, the at least one filament being formed from tungsten;
- and
- a fill gas sealed within the envelope and comprising an inert gas, a halogen-containing compound and a silicon-containing compound for gettering oxygen within the envelope, wherein the silicon-containing compound is present in a sufficient amount to maintain oxygen or an oxygen containing compound for promoting the tungsten halogen cycle in the envelope during operation of the lamp, and the atomic ratio of silicon to halogen in the fill gas is from 0.1 to about 0.5.
Dependencies are inferred from the claim text.