Discharge lamp and electrode for use in the same

Details Discharge lamp and electrode for use in the same Discharge lamp and electrode for use in the same

2011-04-05

2011-04-05

Williams, Joseph L (Department: 2889)

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

C313S331000

Reexamination Certificate

active

07919914

ABSTRACT:
It is possible to enhance the luminance of a cold-cathode type discharge lamp and to contribute to a prolongation of service life thereof. A discharge lamp1is provided with an electrode3having a cup4with such a shape that a bottom is provided at each of both opposed ends of the glass tube2. The cup4is connected to a lead-in wire8which is inserted through the end of the glass tube2and held thereby. The collision-preventing ring5covering an end surface of the cup4is provided to the open end4aof the cup4. The porous tungsten disk6impregnated with a ternary metal oxide composed of barium (Ba), aluminum (Al), and calcium (Ca) as an electron emission material is provided at a bottom in an inside of the cup4.

REFERENCES:
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PCT International Search Report for PCT/JP2005/000612 mailed on May 17, 2005.
Form PCT/IB/338—English translation of International Preliminary Examination Report dated Nov. 6, 2006.

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