Patent ID: 6815895
Filing Date: 2004-11-09
Classification: H01J

Abstract:
Ultra-high pressure mercury lamp, comprising:a silica glass light emitting part, a pair of opposed electrodes, a rare gas, and a halogen in said light emitting part, and an amount of mercury of at least 0.15 mg/mm3 of inner volume of the light emitting part, wherein the amount of halogen in the light emitting part is at least 1.0Ã—10âˆ’4 &mgr;mol/mm3, wherein molybdenum is present in the light emitting part in an amount less than or equal to 0.5Ã—10âˆ’5 &mgr;mol/mm3. wherein hermetically sealed parts extend from opposite ends of the light emitting part, and wherein a Mo foil to which a respective one of the electrodes is connected is sealed in each of the sealed parts.