Low-pressure metal vapor discharge lamp

Details Low-pressure metal vapor discharge lamp Low-pressure metal vapor discharge lamp

1980-09-22

1982-09-14

Segal, Robert

Electric lamp and discharge devices

Liquid electrode discharge devices

Auxiliary starting or holding electrode

313180, H01J 1970, H01J 6124

Patent

active

043497640

ABSTRACT:
The invention relates to a low-pressure metal vapor discharge lamp comprising a discharge tube and an outer bulb enveloping the discharge tube. Provided between the discharge tube and the outer bulb are a barium-containing getter and an electrical resistor which, in operation assumes a temperature of at least 500.degree. C., for cracking CH.sub.4 gas.
According to the invention, the resistor is enveloped for the greater part by a ceramic tube, which prevents the electrons emitted by the hot resistor from being deposited on the exterior of the discharge tube wall.

REFERENCES:
patent: 2089325 (1937-08-01), Aldington
patent: 3274415 (1966-09-01), Thomas et al.
patent: 3737710 (1973-06-01), Waymouth et al.

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