Thermionic hairpin cathode

Details Thermionic hairpin cathode Thermionic hairpin cathode

1988-04-12

1990-02-06

DeMeo, Palmer C.

Electric lamp and discharge devices

With temperature modifier

For filament or heated cathode

313 40, 313264, 313341, H01J 116

Patent

active

048990787

ABSTRACT:
A thermionic hairpin cathode with a long operating life is made of a high melting metal wire, in which the temperature distribution along the legs is influenced either by locally increasing the radiation at a distance of 10 to 50% of the leg length from the crown or by decreasing the radiation in the immediate vicinity of the crown without changing the wire legs, possibly also by combining both measures, so that by increasing the temperature gradient in the crown region the maximum temperature is shifted close to or at the emission center.

REFERENCES:
patent: 3279042 (1966-10-01), Fitzer et al.
patent: 3356887 (1967-12-01), Heil et al.
patent: 4473771 (1984-09-01), Chotsky et al.

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