| 摘要 |
PURPOSE:To prevent cracks generated on a metallic foil provided on the sealing portion of an airtight vessel in the captioned lamp, by providing a flexible portion which is not welded to a quartz glass in sealing portions, in the vicinity of the connecting portion to an electrode. CONSTITUTION:On both sealing portions of an airtight vessel 1 made of a quartz glass, a pair of electrode base portions opposed to each other are sealed via a sealing metallic foil, thus a high pressure discharge lamp such as a xenon lamp is formed. When a small diameter portion of the base portion 4a of an electrode 4 is connected to an outside introducing body 7 through a quartz body 6, inside of the quartz glass 3a in the sealing portion, a sealing metallic foil 5, having a flexible portion 5a which is not welded to the quartz glass 3a in the vicinity of the connecting portion B, is employed. And, expansion force applied to the metallic foil 5 by expansion and construction generated on the electrode 4 during flashing can be absorbed. Therefore, it is possible to prevent the breakage of the metallic foil 5 without enlarging the size of the lamp.
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