Claims
- 1. A high pressure discharge lamp including an arc tube comprising a tubular body of translucent refractory material, end walls closing ends of the body, and electrodes supported in the end walls, the arc tube containing a metal halide for creating an arc plasma, said metal halide forming a molten pool during operation of the lamp, and said end walls being formed with an annular recessed well for containing said metal pool, the wall of the arc tube surrounding the well being thicker than the wall of the tubular body, wherein each end wall comprises an end plug adapted to fit inside the end of the tubular body, and wherein the annular recessed well is formed within the end plug with an outer wall of the end plug surrounding the well.
- 2. A high pressure discharge lamp according to claim 1, wherein the end plug has a flange around its outer wall to engage an end of the tubular body, said flange having an outer diameter larger than an outer diameter of the end of the tubular body and abutting the end of the tubular body.
- 3. A high pressure discharge lamp including an arc tube comprising a tubular body of translucent refractory material, end walls closing ends of the body, and electrodes supported in the end walls, the arc tube containing a metal halide for creating an arc plasma, said metal halide forming a molten pool during operation of the lamp, and said end walls being formed with an annular well for containing said metal pool, the wall of the arc tube surrounding the well being thicker than the wall of the tubular body, wherein each end wall comprises an end plug adapted to fit inside the end of the tubular body, the annular well is formed within the end plug with an outer wall of the end plug surrounding the well, and said outer wall of the end plug is tapered in an upwardly direction, with the upper, outer, end of the wall in contact with the inside of the tubular body.
- 4. A high pressure discharge lamp including an arc tube comprising a tubular body of translucent refractory material, end walls closing ends of the body, and electrodes supported in the end walls, the arc tube containing a metal halide for creating an arc plasma, said metal halide forming a molten pool during operation of the lamp, and said end walls being formed with an annular well for containing said metal pool, the wall of the arc tube surrounding the well being thicker than the wall of the tubular body, wherein the inner portion of the end wall, which surrounds an electrode, and which forms an inner wall of said annular recess, tapers upwardly.
Parent Case Info
This application is a now U.S Pat. No. 6,583,563 division of application Ser. No. 09/250,634, filed Feb. 16, 1999, which is hereby incorporated by reference in its entirety.
This application is a continuation-in-part of U.S. Ser. No. 09/067,816, filed Apr. 28, 1998 now abandoned, which is hereby incorporated by reference in its entirety.
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Entry |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09/067816 |
Apr 1998 |
US |
Child |
09/250634 |
|
US |