| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of impurity gas causing melanization in a light-emitting part as gas molecules absorbed by the surface of a tungsten electrode by a getter action of titanium contained in the electrode as impurities are brought into the light-emitting part of an arc tube together with the electrode, in order to further improve life characteristics of a high-pressure discharge lamp used as a light source for a liquid crystal projector, a liquid crystal rear-projection monitor or the like. SOLUTION: Tungsten electrodes made of high-purity tungsten with a titanium content of 0.08 ppm or less are used as electrodes 5, 5 arranged inside the light-emitting part 2 of the arc tube 1. COPYRIGHT: (C)2007,JPO&INPIT
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