Lighting device, particularly a high-pressure metal halide lamp
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United States of America Patent
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Issued Date -
Apr 5, 2007
app pub date -
Sep 27, 2006
filing date -
Sep 30, 2005
priority date (Note) -
Abandoned
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Abstract
The invention is directed to a lighting device, particularly a high-pressure metal halide lamp, wherein a material combination of the body, frit and base materials is selected such that: a. the Coefficient of Thermal Expansion of the material of the frit material (CTE.sub.frit) matches with the Coefficients of Thermal Expansion of the material of the lamp base (CTE.sub.base) and the material of the body (CTE.sub.body), respectively, or, b. the material of the frit (CTE.sub.frit) bridges with the Coefficients of Thermal Expansion of the material of the lamp base (CTE.sub.base) and the material of the body (CTE.sub.body), respectively, at least at the joining surfaces of the body, frit and base materials, to sustain a hermetic bonding and withstand pressure and temperature conditions.
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