Incandescent lamp with modified helium fill gas

Details Incandescent lamp with modified helium fill gas Incandescent lamp with modified helium fill gas

H - Electricity

01

K

313/118, 318/18,

H01K 1/30 (2006.01) H01K 1/50 (2006.01) H01K 7/02 (2006.01)

Patent

CA 1037096

INCANDESCENT LAMP WITH MODIFIED HELIUM FILL GAS Abstract of the Disclosure An incandescent lamp has an envelope defining a sealed fill gas cavity in which is located an electrically energizable tungsten filament that, when energized, has a sheath formed therearound of nonreactive gas and vaporized tungsten to suppress filament evaporation; the gas fill further includes a small quantity of helium in the range of 1% - 6% of the total gas charge effective to increase the density of the sheath and to increase temperature gradient within the sheath thereby to produce a drive force that improves the redeposition of tungsten vapor from the sheath back to the filament thereby to increase bulb life.

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