Low pressure discharge lamp having sintered "cold cathode" discharge electrodes
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United States of America Patent
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Dec 17, 1996
Issued Date -
N/A
app pub date -
Aug 10, 1992
filing date -
Dec 4, 1990
priority date (Note) -
Expired
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Abstract
A fluorescent low pressure discharge lamp is provided with axially mounted cold-cathode electrodes consisting of a sintered shaped mixture of inorganic material including about 50-90% by weight of tungsten and the remainder BaO or a mixture of BaO, CaO and SrO and oxides of Y, Zr or Hf or the rare earths. The electrodes have a uniform density throughout with a porosity of less than 10%.
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