Electrode feedthrough assembly for arc discharge lamp

Details Electrode feedthrough assembly for arc discharge lamp Electrode feedthrough assembly for arc discharge lamp

1987-12-18

1989-02-14

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313625, 313 25, 445 26, 445 44, H01J 6136, H01J 932

Patent

active

048048895

ABSTRACT:
A ceramic arc tube assembly for an arc discharge lamp includes an arc tube having openings for electrode feedthroughs at opposite ends. The feedthroughs each comprise a niobium tube having a tungsten electrode welded to it. A connection wire is welded to the feedthrough at or near the end of the niobium tube, and the feedthrough is subsequently sealed into the arc tube with the connection wire abutting the arc tube. Since the connection wire is prewelded to the feedthrough, the feedthrough can be made as short as practicable without risk of damaging the seal during welding. As a result, feedthrough material cost is substantially reduced. Preferably, the connection wire is used for locating the feedthrough in the arc tube during seal formation.

REFERENCES:
patent: 3564328 (1971-02-01), Bagley et al.
patent: 3609437 (1971-09-01), De Vrijer
patent: 4147952 (1979-04-01), Webb et al.
patent: 4464603 (1984-08-01), McVey
patent: 4545799 (1985-10-01), Rhodes et al.

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