Discharge lamp having a cathode and emitter assembly composed of tungsten and thorium oxide and joined through a carbide interface region
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United States of America Patent
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Sep 8, 2009
Grant Date -
Oct 4, 2007
app pub date -
Mar 29, 2007
filing date -
Mar 29, 2006
priority date (Note) -
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Abstract
A high pressure discharge lamp, in which an anode and a cathode are disposed opposite each other in a bulb, achieves a long service life due to thorium (Th) being stably supplied to the cathode tip for a long time after lamp operation has been commence since the formation of the flicker phenomenon is suppressed over a long time due to the cathode being made of tungsten which contains thorium oxide on a surface space from the cathode tip, a carbide layer of tungsten carbide is formed and the cathode being bordered by an emitter containing body of tungsten which contains thorium dioxide, and a carbide layer of tungsten carbide being formed at least in a region bordering the cathode.
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