High-load and high-intensity discharge lamp

Details High-load and high-intensity discharge lamp High-load and high-intensity discharge lamp

2006-03-30

2009-08-04

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Electrode composition

C313S34600R

Reexamination Certificate

active

07569994

ABSTRACT:
The present high-load and high-intensity discharge lamp includes a cathode made of a material which does not (substantially) include thorium but can be used as a cathode material of high heat load, so that a long lifetime and high stability corresponding to those of thoriated-tungsten can be realized. Specifically, the cathode is made of a metal base having a high melting point which mainly consists of tungsten and includes a coexisting substance in which an oxide of at least one kind of metal selected from lanthanum, cerium, yttrium, scandium, and gadolinium and an oxide of at least one kind of metal selected from titanium, zirconium, hafnium, niobium, and tantalum are coexistent. The conversion grain size of the coexisting substance is 15 μm or greater, and the plurality of coexisting substances are present in the metal base with a high melting point.

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patent: 08-077967 (1996-03-01), None
patent: WO03/075310 (2003-09-01), None

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