Metal halide discharge lamp, illumination optical apparatus, and image display system.

摘要

In a metal halide lamp container 1 sealed with mercury and rare gas, GdX3, LuX3, 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 GdX3 and LuX3 is set in a range of 0.1</=GdX3/LuX3</=10. In addition to GdX3, LuX3, and CsX, at least one of thallium halide and dysprosium halide is added. Or DyX3, LuX3, NdX3, 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. <IMAGE>