Gte Products Corporation

Gte Sylvania Incorporated

Richard A Snellgrove

Elliot F Wyner

David Alan Goodman

John L Plumb

Rudy E Geens

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, said feedthrough member being sealed into said seal button by means of a fritless seal between said seal button and said feedthrough; and sealing frit material sealing said seal buttons into the ends of said tubular ceramic envelope. A method for fabricating the above-described arc tube and high pressure metal vapor discharge lamp including the above-described arc tube is also provided.

Arc tube for high pressure metal vapor discharge lamp

Method for isolating arc lamp lead-in from frit seal

An emissive material for use in a vapor discharge device including reacted Ba.sub.x Sr.sub.1-x Y.sub.2 O.sub.4 wherein X satisfies the following: 1&gt;X.gtoreq.0. A vapor discharge device is provided having an arc tube which includes electrodes therein coated with such emissive material.

Vapor discharge device with electron emissive material

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.

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Danvers, MA, United States of America

Richard A Snellgrove