| 摘要 |
PROBLEM TO BE SOLVED: To provide a light emitting vessel for a high pressure discharge lamp enabling to prolong the life of the lamp even if the discharging space is cylinder- shaped. SOLUTION: The light emitting vessel is composed of a cylinder-shaped trunk part 1 forming a light emitting space of discharge, ring-shaped sealing parts 2, 2 sealing both ends of the trunk part 1, respectively, and capillary parts 3, 3 extruding outsides from almost center part of the sealing part so as to face each other in opposite direction, and fixing an inserted discharge electrodes, which are formed so as to have translucency by using alumina as a main component and adding MgO, and the wall thickness of the trunk part at the boundary part between the trunk part 1 and the sealing part 2 is made thicker than the wall thickness at the neighbor of the middle part of the light emitting space of discharge by forming a taper part 4a.
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