Electric lamp and discharge devices – With gas or vapor – Electrode composition
Patent
1988-12-07
1990-08-21
DeMeo, Palmer C.
Electric lamp and discharge devices
With gas or vapor
Electrode composition
313631, H01J 6106
Patent
active
049509543
ABSTRACT:
A metal halide discharge lamp includes an arc tube having a chemical fill, and a pair of electrodes sealed in the arc tube. The electrodes are tungsten and have differing thoria contents. The electrodes with differing thoria contents provide faster starting times than electrodes with equal low thoria contents and eliminate the electrode meltback, voltage increase and lumen loss that is characteristic of electrodes with equal but higher thoria contents. Preferably, one electrode has a thoria content of about 1.5 to 2 weight percent, and the other electrode has a thoria content of about one weight percent or less.
REFERENCES:
patent: 4105908 (1978-08-01), Harding et al.
patent: 4396857 (1983-08-01), Danko
patent: 4633136 (1986-12-01), Fromm et al.
patent: 4847534 (1989-07-01), Der Kinderen
Bazin Simone P.
Karlotski Robert J.
Passmore Edmund M.
DeMeo Palmer C.
GTE Products Corporation
Romanow Joseph S.
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