High-pressure discharge lamp

Details High-pressure discharge lamp High-pressure discharge lamp

2006-11-21

2006-11-21

Guharay, Karabi (Department: 2879)

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

C445S049000

Reexamination Certificate

active

07137859

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 D1and a length L1,the nipple has a proximal end having a diameter D2and a length L2,and the coil and the melted tip end (including the nipple) have a volume V1and 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≦D2/D1≦0.3, 0.2≦L2/L1≦0.4, and 0.2≦V2/V1≦0.4.

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Japanese Office Action dated Jun. 9, 2004 with English translation of pertinent portions.

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