Electric incandescent lamp
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United States of America Patent
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-
May 25, 1982
Grant Date -
N/A
app pub date -
Apr 14, 1980
filing date -
Feb 26, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the 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 revolution and a cylindrical filament extends between the foci thereof, the distance between focal points being from 1-2 times the length of the filament.
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