High pressure sodium vapour discharge lamp with electron...

Details High pressure sodium vapour discharge lamp with electron... High pressure sodium vapour discharge lamp with electron...

H - Electricity

01

J

313/10

H01J 61/073 (2006.01) H01J 1/14 (2006.01)

Patent

CA 1121854

PHN. 8973. ABSTRACT: High-pressure sodium vapour discharge lamps are used which contain an electron-emitting material consist- ing of alkaline earth metals bound to oxygen and tungsten bound to oxygen. It has been found that such lamps which have a high Hg/Na ratio, use neon/argon as a starter gas and have powers of less than 400 W fail prematurely when the alkaline earth metals and tungsten in the electron- emitting material are present in stoichiometric quantities (total alkaline earth metal oxide : NO3 = 3). The free ends of electrodes of lamps according to the invention are wound with tungsten wire. Electron-emitting material com- prising barium, strontium and calcium bound to oxygen and tungsten bound to oxygen is disposed in the cavities formed between the tungsten wire turns. The molar ratio of the total barium, strontium and calcium bound to oxygen to the tungsten bound to oxygen is between 8 and 50.

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