High-pressure sodium vapor discharge lamp

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

1979-09-17

1982-03-30

Demeo, Palmer C.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

313213, 313229, 313346R, H01J 61073, H01J 6122

Patent

active

043226540

ABSTRACT:
High-pressure sodium vapor discharge lamps are used which contain an electron-emitting material consisting 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 oxide: WO.sub.3 =3).
The free ends of electrodes of lamps according to the invention are wound with tungsten wire. 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.

REFERENCES:
patent: 4052634 (1977-10-01), De Kok
patent: 4152620 (1979-05-01), Bhalla

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