Tungsten halogen lamp with coiled getter
AssigneeGTE Products Corporation
InventorsJames E. Oetken, Jeffrey P. Buschmann
Life of this patent
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Abstract
A single-ended tungsten halogen lamp having a tubular hardglass evenelope containing an inert gas and a halogen, preferably bromine. An improved halogen regenerative cycle in this type of lamp is achieved by minimizing the bromine and impurity attack on the tungsten filament, thus increasing lamp life over a wider application temperature range, through the use of a tantalum or zirconium getter which is in the form of a coil. This coil is particularly useful in small volume lamps, and in a preferred embodiment, is attached to the filament mounting structure (bridge) on the side thereof opposite the main filament body.
Claims8
In a low wattage tungsten halogen lamp including a hermetically-sealed, light-transmitting envelope, an inert fill and halogen disposed within said envelope, an insulative support bridge located within said envelope, a coiled tungsten filament located within said envelope and supported from said insulative support bridge, a filament support wire secured to and extending from said insulative support bridge for supporting said tungsten filament, and means for gettering impurities within said envelope, the improvement wherein said filament support wire includes an end portion extending from said insulative support bridge on a side opposite said coiled tungsten filament and said means for gettering said impurities within said envelope is in coil form to provide increased surface area for getter absorption, said coil getter secured to said end portion of said filament support wire such that said insulative support bridge is positioned between said coil getter and said tungsten filament.
Dependencies are inferred from the claim text.