Arc tube and high pressure discharge lamp including same

Details Arc tube and high pressure discharge lamp including same Arc tube and high pressure discharge lamp including same

1989-10-11

1991-03-19

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313623, H01J 6136

Patent

active

050013963

ABSTRACT:
An arc tube including a tubular ceramic envelope; a chemical fill within the envelope; a seal button at each end of the envelope, the seal button having an aperture therethrough for receiving a feedthrough member; a feedthrough member having an electrode projecting therefrom passing through the seal button aperture and being oriented such that the electrode projects into the tubular ceramic envelope; frit material sealing the seal buttons into the ends of the envelope and the feedthrough members into the seal buttons; and means for interrupting the seal interface between the feedthrough member and the 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 includes 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 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.

REFERENCES:
patent: 4437039 (1984-03-01), Larson
patent: 4560903 (1985-12-01), Sneijers et al.
patent: 4721886 (1988-01-01), Oomen et al.

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