Incandescent electric lamp with means for reducing effects of de

Details Incandescent electric lamp with means for reducing effects of de Incandescent electric lamp with means for reducing effects of de

1981-05-18

1984-07-24

Laroche, Eugene R.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Reflector

313315, 313578, H01K 132

Patent

active

044619693

ABSTRACT:
An incandescent electric lamp having a filament which incandesces and produces a vapor of the metal of the filament which normally deposits on the wall. A coating is placed on the filament wall where the majority of the vapor would normally deposit to act as a reflecting coating so that the visible energy reflected from the coating will be transmitted through a portion of the wall which is not blackened by the vapor. The coating thickness is adjusted so that the deposit from the filament builds up on a nodal surface so that light absorption is small.

REFERENCES:
patent: 2001528 (1935-05-01), Groot et al.
patent: 2221629 (1940-11-01), Birdseye
patent: 2398968 (1946-04-01), Singer
patent: 2859369 (1958-11-01), Williams et al.
patent: 2918595 (1950-12-01), Cressman
patent: 2980818 (1961-04-01), Harris et al.
patent: 3209188 (1965-09-01), Freeman
patent: 3325666 (1967-06-01), Bird et al.
patent: 4160929 (1979-07-01), Thorington et al.

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