Protective beryllium oxide coating for high-intensity discharge

Details Protective beryllium oxide coating for high-intensity discharge Protective beryllium oxide coating for high-intensity discharge

1990-07-16

1991-07-16

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313638, 427107, 445 13, H01J 6118, H01J 6135, H01J 920

Patent

active

050327623

ABSTRACT:
A protective beryllium oxide coating of suitable thickness is applied to the inner surface of the arc tube of a high-intensity, metal halide discharge lamp in order to avoid a substantial loss of the metallic portion of the metal halide fill and hence a substantial buildup of free halogen, thereby extending the useful life of the lamp. A preferred lamp structure includes a fused silica arc tube. The beryllium oxide coating is preferably applied to the arc tube by evaporating beryllium in the arc tube under non-oxidizing conditions, and then heating in an oxidizing atmosphere.

REFERENCES:
patent: 3350598 (1967-10-01), Corbin et al.
patent: 3377498 (1968-04-01), Koury et al.
patent: 3900754 (1975-08-01), Mason et al.
patent: 4339686 (1982-07-01), Potter
patent: 4647821 (1987-03-01), Lapatovich et al.
patent: 4810938 (1989-03-01), Johnson et al.
Waymouth, J. F., "Electric Discharge Lamps", MIT Press, 1971, pp. 266-277.

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