High-pressure discharge lamp
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United States of America Patent
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Sep 10, 2002
Issued Date -
N/A
app pub date -
Jan 11, 2001
filing date -
Apr 16, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A high-pressure discharge lamp which includes a light-transmitting air-tight discharge container, an electrode formed of tungsten as a main component and fixedly sealed in the discharge container, and a discharge medium containing a halide of a light emitting metal and sealed in the discharge container. The surface of the electrode is defined as follows. That is, the average value of center line average roughness Ra of the surface, is set to 0.3 .mu.m or less, or the average value of the center line average roughness Rz of the surface of the electrode, is set to 1.0 .mu.m or less, or the average value of the surface area increasing rate of the surface of the electrode is set to 1.0% or less.
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