Electron beam heated thermionic cathode

Details Electron beam heated thermionic cathode Electron beam heated thermionic cathode

1984-07-23

1986-04-15

Dixon, Harold

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313 37, 313310, 313340, 313352, 315 32, H01J 1104

Patent

active

045830231

ABSTRACT:
A preferably fully impregnated dispenser cathode member or the like forming part of an electron tube, electron beam generator or the like is initially heated by any suitable means to a temperature sufficient for low level electron emission from its rear surface. A hot plate member of preferably equal size is disposed behind the cathode and can either be part of or the means for initially heating the cathode member or it can be heated with the cathode member to the aforementioned cathode member's rear surface low level emission temperature. A sustainer voltage is applied between the cathode member and the hot plate member sufficient to draw a current comprising electron flow from the cathode member to the hot plate member across the space separating them. This current flow or back electron beam results in heating of the hot plate member to a temperature sufficient to raise the closely spaced cathode member to, and then maintain it at, the desired emission temperature and simultaneously allow timely termination of the initial heating process since it is needed only initially.

REFERENCES:
patent: 3958146 (1976-05-01), Buescher et al.

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