Lamp with IR reflecting film and light-scattering coating

Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Light diffusing

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Details

313112, 252584, 359599, 359586, H01J 516, H01K 132

Patent

active

056274262

ABSTRACT:
Incandescent lamps or arc lamps having an infrared red reflecting multilayer optical interference filter on the outer surface of the vitreous or fused quartz lamp envelope enclosing the filament have a light-scattering coating applied over the filter to scatter light emitted by the lamp and thereby diffuse the filament image. The light-scattering coating consists of light-scattering particles, such as alumina, dispersed in a silica matrix. This coating is formed by applying to the filter a silicone solution in which is dispersed colloidal silica and light-scattering particles and pyrolyzing at high temperature to drive off the organic components and form the silica matrix.

REFERENCES:
patent: 4171227 (1979-10-01), Derolf et al.
patent: 4663557 (1987-05-01), Martin, Jr. et al.
patent: 4721877 (1988-01-01), Kawakatsu et al.
patent: 5410212 (1995-04-01), Reisman
patent: 5412274 (1995-05-01), Parham

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