High-pressure discharge lamp
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United States of America Patent
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Nov 21, 2006
Issued Date -
N/A
app pub date -
Mar 19, 2004
filing date -
Aug 6, 2001
priority date (Note) -
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Abstract
A high-pressure discharge lamp is produced using tungsten wire that is wound as a double coiled winding around an electrode metal rod, leaving a tip end thereof, and the double coiled winding is machined into a melted tip end by a YAG laser beam, with the remaining double coiled winding used as a coil. The tip end of the metal rod is machined into a nipple on the distal end of the melted tip. The melted tip has a diameter D1 and a length L1, the nipple has a proximal end having a diameter D2 and a length L2, and the coil and the melted tip end (including the nipple) have a volume V1 and the melted tip end (including the nipple) has a volume V2, when the electrode assembly is machined to satisfy at least one of the conditions 0.15.ltoreq.D2/D1.ltoreq.0.3, 0.2.ltoreq.L2/L1.ltoreq.0.4, and 0.2.ltoreq.V2/V1.ltoreq.0.4.
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