Bromine lamp with molybdenum parts
AssigneeGeneral Electric Company
InventorsRobert S. Roller, Richard H. Holcomb, George K. Danko
Life of this patent
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Abstract
A long life tungsten halogen lamp comprising a fused silica envelope containing a coiled tungsten filament connected across inleads sealed therein which include inner portions of molybdenum wire. The molybdenum wire has been treated to increase its ductility and reduce the concentration of impurities at the surface. The fill gas at a room temperature total pressure of at least 2,000 torr comprises nitrogen, an inert gas and a bromine-bearing component which provides from 1.6 .times. 10.sup.-.sup.8 to 8.0 .times. 10.sup.-.sup.8 gram atoms of bromine per cubic centimeter of envelope volume.
Claims10
A bromine regenerative cycle incandescent lamp comprising an envelope of light-transmitting material of high softening temperature, inleads including inner portions of molybdenum sealed into said envelope, an incandescible tungsten filament coil connected across said inner portions, the distance from the filament to the envelope wall being small enough that the inner wall temperature immediately surrounding the filament is at least about 700.degree. C and the low point temperature at the ends of the envelope is at least about 350.degree. C during operation, said inner portions being of molybdenum wire which has been treated to increase its ductility to a minimum elongation of 15% and reduce the concentration of impurities at the surface, and a fill gas comprising nitrogen, an inert gas and a bromine-providing component at a total minimum pressure of 2000 torr, said component providing from 1.6 .times. 10.sup.-.sup.9 to 8.0 .times. 10.sup.-.sup.8 gram atoms of bromine per cubic centimeter of envelope volume.
Dependencies are inferred from the claim text.