| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-pressure mercury lamp capable of satisfactorily preventing the clouding of the quartz glass constituting a discharge vessel and its development to prevent a sudden reduction in screen illumination in the use as a light source for liquid crystal projector. SOLUTION: This high-pressure mercury lamp 1 comprises a discharge vessel 2 consisting of quartz glass, a pair of tungsten electrodes 4 arranged opposite to each other in the discharge vessel 2, and 0.16 mg/mm<3> or more of mercury, a rare gas, and a halogen sealed in the discharge lamp 2, and its tube wall load is 0.8 W/cm<2> or more. In this lamp 1, the sealing quantity of the halogen is set within the range of 2×10<-4> -7×10<-3>μmol/mm<3> .
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