Metal halide lamp

Details Metal halide lamp Metal halide lamp

1994-03-03

1995-09-19

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

313640, 313641, 313571, H01J 6120, H01J 6122

Patent

active

054518385

ABSTRACT:
A metal halide lamp includes a quartz sealed tube having a pair of electrodes using tungsten as the base material. Argon gas, mercury, at least one kind of rare earth metal (e.g., dysprosium, holmium, thulium, neodymium, and erbium), bromine, iodine, and an alkali metal, e.g., cesium, are contained in the sealed tube. The total number of moles of bromine and iodine in the sealed tube is in excess of the number of moles of the rare earth metal. Accordingly, tungsten which is liberated from the electrode during electric discharge can be captured mainly by iodine. A reaction between silicon dioxide, which is a constituent component of the sealed tube, and tungsten is prevented, thereby preventing blackening of the tube wall of the sealed tube.

REFERENCES:
patent: 4647814 (1987-03-01), Dobrusskin et al.
patent: 4686419 (1987-08-01), Block et al.
patent: 4978884 (1990-12-01), Van Vliet et al.
patent: 5264760 (1993-11-01), Genz et al.
patent: 5323085 (1994-06-01), Genz

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