H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 61/56 (2006.01) H01J 13/46 (2006.01) H01J 61/34 (2006.01) H01K 1/50 (2006.01) H05B 37/00 (2006.01)
Patent
CA 2396623
An electric lamp is provided which includes a sealed thin-walled outer envelope containing a fill gas having a high thermal. conductivity. A lamp capsule is contained within the outer envelope and is in series with an oxidizable fuse also contained within the outer envelope. The fill gas serves to reduce the temperature of the fuse during normal operation of the lamp thereby reducing the power loss in the fuse, increasing overall lamp efficacy and eliminating glow of the fuse. The lamp capsule is quickly extinguished if the outer envelope is broken and the fuse exposed.to air. In one embodiment, an incandescent lamp is provided wherein the lamp capsule is a tungsten halogen capsule, the fuse is a tungsten coil wire and the fill gas is helium.
Fetherstonhaugh & Co.
Osram Sylvania Inc.
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