Long-life high-pressure discharge lamp and lamp unit using same

Details Long-life high-pressure discharge lamp and lamp unit using same Long-life high-pressure discharge lamp and lamp unit using same

2005-09-06

2005-09-06

Guharay, Karabi (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Electrode composition

C313S630000, C313S631000, C313S491000, C313S639000

Reexamination Certificate

active

06940228

ABSTRACT:
A high-pressure discharge lamp comprises a lamp tube made of quartz glass and having a central portion formed in a spherical shape, and a pair of opposing tungsten electrodes inserted into the lamp tube. At least one of the tungsten electrodes is made of a tungsten material which contains more than 10 ppm of one of Co and Ni, or 10 ppm of Co and Ni in total, or a tungsten material which contains 20 ppm or more of at least two of Fe, Co and Ni in total, or a tungsten material which contains 20 ppm or more of Fe. Fe, Co and Ni belong to iron-group metals. The inter-electrode distance, i.e., distance between the leading ends of both tungsten electrodes is set to approximately 1-2 mm or less.

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patent: 2001-319617 (2001-11-01), None

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