| 摘要 |
87-1-157 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 |
