Electric incandescent lamp with ellipsoid-shaped envelope

Details Electric incandescent lamp with ellipsoid-shaped envelope Electric incandescent lamp with ellipsoid-shaped envelope

H - Electricity

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H01K 1/32 (2006.01) H01K 1/18 (2006.01) H01K 1/26 (2006.01) H01K 1/28 (2006.01)

Patent

CA 1146625

1 PHN 9356 ABSTRACT: In electric incandescent lamps having an infrared radiation-reflecting filter which is pervious to visible light, the efficiency can be increased by adapting the geometry of the filter and the geometry of the filament to each other. According to the invention, the filter comprises a major portion of a prolate ellipsoid of revolu- tion and a cylindrical filament extends between the foci thereof, the distance between focal points being from 1-2 times the length of the filament.

346174

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