AC high pressure discharge lamp, especially for high current lev

Details AC high pressure discharge lamp, especially for high current lev AC high pressure discharge lamp, especially for high current lev

1990-01-22

1992-01-14

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

Having electrode of alkali, alkaline or rare earth material

313631, 313633, 313571, H01J 61073

Patent

active

050813960

ABSTRACT:
To prevent the formation of melt-back slugs or granules on electrodes of h pressure, high power discharge lamps, when the lamps are operated under alternating current conditions of between about 20 to 60 A, for example, the electrodes are terminated in regions of decreasing diameter and, in accordance with the invention, comprise tungsten doped with lanthanum oxide (La.sub.2 O.sub.3) between about 0.5 to 2%, by weight, preferably about 1%. The doping intensity may increase towards the inside region of the electrode.

REFERENCES:
patent: 2670451 (1954-02-01), Freeman et al.
patent: 2697183 (1954-12-01), Neunhoeffer et al.
patent: 2965790 (1960-12-01), Ittig et al.
patent: 3988629 (1976-10-01), White et al.
patent: 4019081 (1977-04-01), Buxbaum et al.
patent: 4039883 (1977-08-01), Damsteeg et al.
patent: 4097762 (1978-06-01), Hilton et al.
patent: 4612475 (1986-09-01), Downing
patent: 4906895 (1990-03-01), Pabst et al.

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