| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp in which the consumption of an electrode can be suppressed effectively. SOLUTION: Because an oxygen amount in the electrode 24 is made to be 15 ppm or less, tungsten which is an electrode material can be prevented from getting lower in a melting point, and the consumption of the electrode 24 due to evaporation can be suppressed. Furthermore, because a halogen amount enclosed in a light-emitting tube 12 is set to be within a range of 1×10<SP>-7</SP>to 1×10<SP>-2</SP>μmol/mm<SP>3</SP>, the consumption prevention effect of tungsten due to a halogen regenerating cycle can be developed effectively, and furthermore, by preventing rapid electrode corrosion, an electrode lifetime can be extended. Therefore, the generation of blackening and a flicker can be prevented and the life elongation of the high-pressure discharge lamp 10 can be achieved. COPYRIGHT: (C)2005,JPO&NCIPI
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