Thorium-free discharge lamp with reduced halides and increased relative amount of Sc
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United States of America Patent
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May 7, 2013
Grant Date -
Aug 26, 2010
app pub date -
Sep 19, 2008
filing date -
Sep 24, 2007
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Abstract
A high-pressure gas discharge lamp has a sealed discharge vessel with an inner discharge space. Two electrodes project into the discharge space. The filling in the discharge space includes metal halides and a rare gas. The filling is free of Hg and Th and includes halides in an amount of 7.1-11.4 μg/mm3 of the volume of the discharge space. The halides includes at least NaI and ScI3, provided in such amounts that a ratio of the masses of NaI to ScI3 is 1.2-1.6.
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