Single-ended Ceramic Discharge Lamp
First Claim
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1. A single-ended ceramic discharge lamp comprising:
- 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; 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
28 Claims
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1. 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; 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 formed of polycrystalline alumina, the discharge vessel having a cupulate body portion and a stem, 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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Specification