Electric incandescent lamp

Details Electric incandescent lamp Electric incandescent lamp

H - Electricity

01

K

313/84, 313/172.

H01K 1/28 (2006.01) H01K 7/02 (2006.01)

Patent

CA 1144974

1 PHN 9371 ABSTRACT: In electric incandescent lamps the efficiency can be increased by surrounding the filament with a light-pervious, infra-red radiation-reflecting filter. It has hitherto always been assumed that the geometry of the filter and that of the filament should be well matched to each other. This, however, results in a complex filament construction. According to the inven- tion, near the centre of a spherical filter, a flat fila- ment consisting of several parts is accommodated, being situated within a square the sides of which are from 0.25 to 0.04 times the diameter of the filter. Such a fila- ment has a relatively simple construction and provides a highly efficient lamp despite the fact that its geometry is very different from that of the filter.

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