High-pressure sodium vapour lamp with emissive electrode...

Details High-pressure sodium vapour lamp with emissive electrode... High-pressure sodium vapour lamp with emissive electrode...

H - Electricity

01

J

313/10

H01J 61/04 (2006.01) H01J 61/073 (2006.01)

Patent

CA 1135763

PHN.9253. ABSTRACT High-pressure sodium vapour discharge lamps are used which contain an electron-emitting material consist- ing of alkaline earth metal 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 or have powers of less than 400 W fail prematurely when the alkaline earth metal and tungsten in the electron- emitting material are present in stoichiometric quantities (total alkaline earth metal oxides: W03 = 3). The free ends of electrodes of lamps according to the invention are wound with tungsten wore. Electron-emitting material consisting of strontium bound to oxygen and tungsten bound to oxygen is disposed in the cavities formed between the tungsten wire turns. The molar ratio of the strontium bound to oxygen to the tungsten bound to oxygen is between 3 and 50.

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