Fluorescent lamp and method of manufacturing same
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United States of America Patent
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Mar 10, 2009
Grant Date -
May 11, 2006
app pub date -
Feb 18, 2004
filing date -
Feb 18, 2003
priority date (Note) -
Expired
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Abstract
A cold cathode fluorescent tube where an electron emitting electrode is sealed in shows much deterioration in the luminance with time, thereby being not adequate for a long time use. The electrode emitting electrode is formed in such a shape that an electric field is not locally concentrated. By mixing a material of high heat conductivity, such as tungsten, as the material for the electron emitting electrode or using helium of high heat conductivity as the sealing gas, a long life of the cold cathode fluorescent tube is achieved.
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