Emitterless SDN electrode

Details Emitterless SDN electrode Emitterless SDN electrode

1984-12-20

1990-03-20

O'Shea, Sandra

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313574, H01J 6104

Patent

active

049104330

ABSTRACT:
The invention relates to a high-pressure sodium vapor discharge lamp having a ceramic discharge vessel. In addition to sodium and possibly mercury the discharge vessel also comprises a rare gas. In the discharge vessel an electrode of a refractory metal is accommodated. In the operating condition of the lamp the discharge emanates from the tip of the electrode. According to the invention the electrode is free from alkaline earth metals and the electrode tip in the operating condition of the lamp has a temperature between 2400 K and 2700 K. Disappearance of sodium caused by the electrode material is prevented in this manner.

REFERENCES:
patent: 3134924 (1964-05-01), Henderson et al.
patent: 3476969 (1969-11-01), Ennulat et al.
patent: 4136227 (1979-01-01), Saito et al.
patent: 4260929 (1981-04-01), Jacobs et al.

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