Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Patent
1990-12-13
1992-03-24
Rowan, Kurt
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
445 58, 427107, H01J 920
Patent
active
050983261
ABSTRACT:
A method for applying a protective coating to the inner surface of the arc tube of a high-intensity metal halide discharge lamp involves dosing the arc tube with an inert gas that is doped with a metal hydride gas. Preferably, the metal hydride gas comprises silane. The arc tube is heated to a sufficiently high temperature to decompose the silane gas. As a result, silicon is deposited as a protective coating on the inner surface of the arc tube wall. The hydrogen gas that is generated by the silane decomposition is removed from the system either by pumping it out before dosing the arc tube with the final arc tube fill, or by diffusion through the arc tube wall during operation of the lamp.
REFERENCES:
patent: 2183302 (1939-12-01), Brauer
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patent: 4374157 (1983-02-01), Barbier et al.
patent: 4810938 (1989-03-01), Johnson et al.
patent: 4812702 (1989-03-01), Anderson
patent: 4857097 (1989-08-01), Berry
patent: 4972120 (1990-11-01), Witting
Waymouth, John F., Electric Discharge Lamps, M.I.T. Press 1971, pp. 266-277.
Gorczyca Thomas
Witting Harald L.
Breedlove Jill M.
Davis Jr. James C.
General Electric Company
Knapp Jeffrey T.
Rowan Kurt
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