Single-ended ceramic discharge lamp
First Claim
Patent Images
1. A single-ended ceramic discharge lamp comprising:
- a discharge vessel, the discharge vessel having a cupulate body portion and a stem both formed of a ceramic material, the cupulate body portion being rotationally symmetric about a central axis and having an inner surface, an outer surface, a rim and a base, the stem extending outwardly from the base and having two electrode assemblies;
a light-transmissive end cap sealed to the rim of the cupulate body portion, the end cap and the cupulate body portion enclosing a discharge cavity, the discharge cavity containing a discharge medium;
each electrode assembly having an electrode tip that protrudes into the discharge cavity, a feedthrough portion that is sealed in the stem, and a lead end for connecting to a source of electric power, the electrode tips of the electrode assemblies defining an arc gap; and
at least one of the inner surface or outer surface of the cupulate body portion comprising an optical surface wherein the arc gap is positioned at a focus of the optical surface.
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Abstract
A single-ended ceramic discharge lamp is described which has an integral optical surface such as a parabolic or elliptical reflector. The single-ended configuration eliminates the need for the mounting structures found in double-ended lamps that can interfere with the light emitted from the lamp, particularly in focused beam applications.
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Citations
30 Claims
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1. A single-ended ceramic discharge lamp comprising:
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a discharge vessel, the discharge vessel having a cupulate body portion and a stem both formed of a ceramic material, the cupulate body portion being rotationally symmetric about a central axis and having an inner surface, an outer surface, a rim and a base, the stem extending outwardly from the base and having two electrode assemblies; a light-transmissive end cap sealed to the rim of the cupulate body portion, the end cap and the cupulate body portion enclosing a discharge cavity, the discharge cavity containing a discharge medium; each electrode assembly having an electrode tip that protrudes into the discharge cavity, a feedthrough portion that is sealed in the stem, and a lead end for connecting to a source of electric power, the electrode tips of the electrode assemblies defining an arc gap; and at least one of the inner surface or outer surface of the cupulate body portion comprising an optical surface wherein the arc gap is positioned at a focus of the optical surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A single-ended ceramic discharge lamp comprising:
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a discharge vessel, the discharge vessel having a cupulate body portion and a stem both integrally formed of a continuous polycrystalline alumina, the cupulate body portion being rotationally symmetric about a central axis and having a rim, a base, and an inner reflector surface, the inner reflector surface comprising a parabolic or elliptical reflector, the cupulate body portion having a wall thickness that is substantially uniform in a region between the rim and the base, the stem extending outwardly from the base and having two electrode assemblies; a sapphire window sealed to the rim of the cupulate body portion, the window and the cupulate body portion enclosing a discharge cavity, the discharge cavity containing a discharge medium; and each electrode assembly having an electrode tip that protrudes into the discharge cavity, a feedthrough portion that is sealed in the stem, and a lead end for connecting to a source of electric power, the electrode tips defining an arc gap, the arc gap being positioned at a focus of the inner reflector surface. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A single-ended ceramic discharge lamp comprising:
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a discharge vessel formed of a ceramic material, the discharge vessel having a cupulate body portion and a stem, the cupulate body portion being rotationally symmetric about a central axis and having an inner surface, an outer surface, a rim and a base, the stem extending outwardly from the base and having two electrode assemblies; a light-transmissive end cap sealed to the rim of the cupulate body portion, the end cap and the cupulate body portion enclosing a discharge cavity, the discharge cavity containing a discharge medium; each electrode assembly having an electrode tip that protrudes into the discharge cavity, a feedthrough portion that is sealed in the stem, and a lead end for connecting to a source of electric power, the electrode tips of the electrode assemblies defining an arc gap wherein the stem has two openings that each receive one of the electrode assemblies, and the feedthrough portions of the electrode assemblies are sealed in the respective opening with a frit material; and at least one of the inner surface or outer surface of the cupulate body portion comprising an optical surface wherein the arc gap is positioned at a focus of the optical surface.
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30. A single-ended ceramic discharge lamp comprising:
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a discharge vessel formed of a ceramic material, the discharge vessel having a cupulate body portion and a stem, the cupulate body portion being rotationally symmetric about a central axis and having an inner surface, an outer surface, a rim and a base, the stem extending outwardly from the base and having two electrode assemblies; a light-transmissive end cap sealed to the rim of the cupulate body portion, the end cap and the cupulate body portion enclosing a discharge cavity, the discharge cavity containing a discharge medium wherein the light-transmissive end cap is a flat, circular sapphire window that is sealed to the rim by an interference fit; each electrode assembly having an electrode tip that protrudes into the discharge cavity, a feedthrough portion that is sealed in the stem, and a lead end for connecting to a source of electric power, the electrode tips of the electrode assemblies defining an arc gap; and at least one of the inner surface or outer surface of the cupulate body portion comprising an optical surface wherein the arc gap is positioned at a focus of the optical surface.
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Specification