High-pressure sodium vapor discharge lamp

Details High-pressure sodium vapor discharge lamp High-pressure sodium vapor discharge lamp

1980-08-28

1983-12-13

Segal, Robert

Electric lamp and discharge devices

With gas or vapor

Having electrode heated by space discharge current

313630, H01J 61073

Patent

active

044207085

ABSTRACT:
A high-pressure sodium vapor discharge lamp contains an electron-emitting material consisting of alkaline earth metals bound to oxygen and tungsten bound to oxygen. It has been found that such lamps of less than 400 W which have either a high Hg/Na ratio or use neon/argon as a starter gas fail prematurely when the alkaline earth metals and tungsten in the electron-emitting material are present in stoichiometric quantities.
The free ends of electrodes of lamps according to the invention are wound with tungsten wire. Electron-emitting material comprising carium, strontium and calcium bound to oxygen and tungsten bound to oxygen is disposed in the cavities formed between the tungsten wire turns. The molar ration of the total barium, strontium and calcium bound to oxygen to the tungsten bound to oxygen is between 8 and 50.

REFERENCES:
patent: 3708710 (1973-01-01), Smyser et al.
patent: 4052634 (1977-10-01), DeKok
patent: 4152620 (1979-05-01), Bhalla

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