| 摘要 |
It is provided a ceramic vessel 1A for a high pressure discharge lamp and for filling an ionizable luminous substance and a starter gas in the inner space of the vessel. The discharge vessel 1A has a tubular central luminous portion 2A, and a pair of tubular end portions 3 protruding from both ends of said central luminous portion, respectively. Each of the end portions 3 has a maximum wall thickness "l" of 0.5 times or larger and 0.9 times or smaller of the wall thickness "t" of the central luminous portion 2A. A ceramic discharge vessel is thereby provided enabling for improving the luminous efficiency of the high pressure discharge lamp. <IMAGE>
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