Long life metal halide lamp and an illumination optical apparatu

Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor

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Details

313638, 313639, 313640, 313641, H01J 1720

Patent

active

055128009

ABSTRACT:
In a metal halide lamp container 1 sealed with mercury and rare gas, GdX.sub.3, LuX.sub.3, and CsX where halogen is iodine, bromine, or their mixture are sealed in a total weight of 1 mg/cc or more, with the weight of CsX defined within a range of 15% or more to 50% or less of the total halides, and the weight ratio of GdX.sub.3 and LuX.sub.3 is set in a range of 0.1.ltoreq.GdX.sub.3 /LuX.sub.3 .ltoreq.10. In addition to GdX.sub.3, LuX.sub.3, and CsX, at least one of thallium halide and dysprosium halide is added. Or DyX.sub.3, LuX.sub.3, NdX.sub.3, and CsX where halogen is iodine, bromine or their mixture are sealed in the specified total weight, with the weight ratio of CsX defined in the above range.

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patent: 5239232 (1993-08-01), Heider et al.
patent: 5264760 (1993-11-01), Genz et al.

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