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Single-ended ceramic discharge lamp

  • US 8,102,121 B2
  • Filed: 02/26/2007
  • Issued: 01/24/2012
  • Est. Priority Date: 02/26/2007
  • Status: Expired due to Fees
First Claim
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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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