Protective coating for high-intensity metal halide discharge lam

Details Protective coating for high-intensity metal halide discharge lam Protective coating for high-intensity metal halide discharge lam

1990-07-16

1991-10-15

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315344, 313635, H05B 4116

Patent

active

050577514

ABSTRACT:
A protective coating of suitable composition and 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 component 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 with a silicon coating. The silicon coating is preferably applied to the arc tube using a chemical vapor deposition process.

REFERENCES:
patent: 4223250 (1980-09-01), Kramer
patent: 4574218 (1986-03-01), Bateman
patent: 4810938 (1989-03-01), Johnson et al.
patent: 4990789 (1991-02-01), Uesaki
Waymouth, J. F., "Electric Discharge Lamps", MIT Press, 1971, pp. 266-277.

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