Incandescent light source with transparent heat mirror

Details Incandescent light source with transparent heat mirror Incandescent light source with transparent heat mirror

1977-03-25

1979-07-10

Grimm, Siegfried H.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313114, 313222, 313315, 313344, 350 17, 350292, 350293, H01K 114, H01K 132

Patent

active

041609298

ABSTRACT:
An incandescent lamp having a transparent heat mirror placed on the lamp envelope which transmits a substantial portion of the energy in the visible range produced by the lamp filament and which reflects back to the filament at least about 80%-85% of the infrared energy that the filament produces. In the preferred embodiment the transparent heat mirror is formed by a layered coating of TiO.sub.2 /Ag/TiO.sub.2 optimized for the operating temperature range of the filament. The filament is constructed to optically conform to the shape of the lamp envelope.

REFERENCES:
patent: 1425967 (1922-08-01), Hoffman
patent: 2084999 (1937-06-01), Birdseye
patent: 2859369 (1958-11-01), Williams et al.
patent: 3209188 (1965-09-01), Freeman
Fan et al., "Transparent Heat Mirrors for Solar-Energy Applications," Applied Optics, vol. 15, No. 4, Apr. 1976, pp. 1012-1017.

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