Metal halide discharge lamp suitable for an optical light source

Details Metal halide discharge lamp suitable for an optical light source Metal halide discharge lamp suitable for an optical light source

1993-12-28

1995-12-26

Sikes, William L.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Reflector

313638, 313639, 313640, 313642, 315200R, H01J 516, H01J 1720, H01J 6120, H05B 3700

Patent

active

054790654

ABSTRACT:
A metal halide discharge lamp operated from a D.C. power source, which is suitable for an optical light source, has a quartz arc tube. Anode and cathode electrodes are disposed in the arc tube. The gap length between electrodes is so short that the metal halide discharge lamp functions as a point light source. The arc tube contains an inert gas, mercury and metal halide additives including metal bromine. By utilizing the catephoresis effects, the transformation of silica (SiO.sub.2) of the arc tube to cristobalite or the formation of an opaque substance on the arc tube is prevented. Atomic percent of bromine to halogen contained in the arc tube is about 60% to 90% and a wall load developed in the arc tube is substantially greater than 40 W/cm.sup.2.

REFERENCES:
patent: 3452238 (1969-06-01), Larson
patent: 3566178 (1971-02-01), Mori
patent: 3798487 (1974-03-01), Zollweg et al.
patent: 4232243 (1980-11-01), Rigden
patent: 4647814 (1987-03-01), Dobrusskin et al.
patent: 4935668 (1990-06-01), Hansler et al.
patent: 5107165 (1992-04-01), Dever et al.
patent: 5135300 (1992-08-01), Toide et al.
patent: 5192891 (1993-03-01), Matsuura et al.

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