Pitted light diffusive coating, a method of forming the coating

Details Pitted light diffusive coating, a method of forming the coating Pitted light diffusive coating, a method of forming the coating

1988-12-05

1991-03-05

O'Shea, Sandra L.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Light diffusing

427106, H01J 6135, B05D 512

Patent

active

049980386

ABSTRACT:
A pitted light diffusive coating having an excellent light diffusion effect and a method of forming the coating and a halogen lamp with the coating are disclosed. The light diffusive coating includes pits on the surface of a continuous coating consisting of a metal oxide formed on a base, and the coating is substantially free of bubbles. The pitted light diffusive coating is formed by coating a base with an organometallic compound and a high boiling-point organic solvent and baking the coating at about 400.degree. C. to 500.degree. C. The halogen lamp has a pitted light diffusive coating formed on an infrared reflective coating on the surface of the outer vessel. Strain, caused by the difference in the thermal expansion coefficient of the structural material of the outer vessel and the structural material of the light diffusive layer occurring when the outer vessel is at a high temperature, is absorbed by the pitted structure, and peeling is prevented.

REFERENCES:
patent: 2405261 (1946-08-01), Levi et al.
patent: 2922065 (1960-01-01), Meister et al.
patent: 3114668 (1963-12-01), Guiles
patent: 3200280 (1965-08-01), Thau et al.
patent: 3206632 (1965-09-01), Rokosz
patent: 3919578 (1975-11-01), Coaton et al.

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