Light diffusive coating and a lamp having the coating

Details Light diffusive coating and a lamp having the coating Light diffusive coating and a lamp having the coating

1985-09-20

1988-01-26

DeMeo, Palmer C.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Plural diverse optical devices

313112, 313116, 313579, 313580, H01K 126, H01K 150, H01K 132

Patent

active

047218770

ABSTRACT:
A light diffusive coating having an excellent light diffusion effect, a method of forming the coating and a halogen lamp with the coating. The light diffusive coating includes bubbles within a continuous coating consisting of a metal oxide formed on a base. The method of forming the light diffusive coating is made by the inclusion of bubbles formed by the evaporization of a high boiling-point organic solvent within the metal oxide coating formed by the application of a combination of an organo-metallic compound with a high boiling-point organic solvent to a base surface, and the subsequent decomposition of the organo-metallic compound on baking. The halogen lamp has a porous light diffusive coating formed on the coating established on the surface of the outer vessel which allows visible light to pass through but reflects infra-red light, so that strain, caused by the difference in thermal expansion efficient of the structural material of the outer vessel and the structural material of the light diffusive layer occuring when the outer vessel is at a high temperature, is absorbed by the porous structure, and prevents peeling.

REFERENCES:
patent: 2811131 (1957-10-01), Lopenski et al.
patent: 2946911 (1960-07-01), Malinowski
patent: 3209188 (1965-09-01), Freeman
patent: 4459506 (1984-07-01), Beck
patent: 4588923 (1986-05-01), Hoegler et al.
"Oxide Layers Deposited from Organic Solutions", by H. Schroeder, Phys., of Thin Film, (1969), pp. 87-141.

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