Discharge tube for high-pressure discharge lamp and high-pressure discharge lamp
AssigneeNGK Insulators, Ltd.
InventorSugio Miyazawa
Life of this patent
Estimating the term…
Abstract
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.
Claims8
A ceramic discharge vessel for a high pressure discharge lamp and for filling an ionizable luminous substance and a starter gas in the inner space of said vessel;
- said vessel comprising a tubular or spherical central luminous portion, and a pair of tubular end portions protruding from both ends of said central luminous portion, respectively, wherein each of said end portions has a maximum wall thickness smaller than that of said central luminous portion.
The discharge vessel wherein the minimum wall thickness of said central luminous portion is 0.5 times or more and 0.9 times or less of the maximum wall thickness of said luminous portion.
Dependencies are inferred from the claim text.