| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultra-high pressure mercury lamp capable of solving the problems caused by projections generated at the tip of electrodes. SOLUTION: This ultra-high pressure mercury lamp comprises a pair of electrodes opposed to each other with a space of 2 mm or less in an arc tube made of quartz glass. The arc tube is filled with not less than 0.15 mg/mm<SP>3</SP>of mercury, a rare gas, and 1×10<SP>-6</SP>to 1×10<SP>-2</SP>μmol/mm<SP>3</SP>halogen. At least one of the pair of electrodes is made up of a large diameter portion formed at a shaft portion by fusing; a projecting portion formed of the tip of the shaft portion, and a reduced diameter portion formed by fusing to extend from the large diameter portion toward the projecting portion. COPYRIGHT: (C)2004,JPO&NCIPI
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