| 摘要 |
PROBLEM TO BE SOLVED: To provide a light emitting vessel for a high pressure discharge lamp which can prolong the life of the lamp even if the light emitting space of discharge 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 transparency by using alumina as a main component, and inner surface of the trunk part at a boundary part 4 of the trunk part 1 and the sealing part 2 is formed so as to have R with a diameter of 1.0 mm to make the thickness change gradually.
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