H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/135
H01J 61/36 (2006.01)
Patent
CA 1311012
87-1-157 ABSTRACT OF THE DISCLOSURE An arc tube for a high pressure metal vapor discharge lamp is provided. The arc tube of the present invention comprises a tubular ceramic envelope; a chemical fill within said envelope; a seal button at each end of said envelope, said seal button having an aperture therethrough for receiving a feedthrough member; a feedthrough member having an electrode projecting therefrom passing through said seal button aperture and being oriented such that the electrode projects into said tubular ceramic envelope; frit material sealing said seal buttons into the ends of said envelope and said feedthrough members into said seal buttons; and means for interrupting the seal interface between said feedthrough member and said frit material around the total circumference of at least a portion of the feedthrough member. In a preferred embodiment of the present invention, the means for interrupting the seal interface between said feedthrough member and said frit material around the total circumference of at least a portion of the feedthrough member comprises a coating disposed around the periphery, or circumference, of the feedthrough member. Such coating comprises a material, most preferably a metal or metal alloy, which is inert to reaction with said frit material, the feedthrough member, and the fill gas components during lamp operation and which has a thermal expansion properties compatible with the thermal expansion properties of both the feedthrough member and the frit material. A high pressure metal vapor discharge lamp including the arc tube of the present invention is also provided. 0136G
599600
Snellgrove Richard A.
Wyner Elliot F.
Gte Products Corporation
R. William Wray & Associates
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