X-ray or gamma ray systems or devices – Source – Electron tube
Patent
1995-02-21
1996-04-23
Porta, David P.
X-ray or gamma ray systems or devices
Source
Electron tube
378138, 378142, H01J 3510
Patent
active
055111041
ABSTRACT:
An x-ray tube, in addition to an anode and a cathode arrangement, has first and second electrodes that are located in an evacuated housing provided with a beam exit window. The anode and the first electrode are at potentials that are positive in comparison to the potentials of the cathode arrangement and the second electrode. Further, the first and the second electrode are arranged lying opposite one another such that secondary electrons emanating from the anode must pass through the space located between the first and the second electrode in order to proceed to the beam exit window. These secondary electrons are thus substantially all prevented from reaching the beam exit window, thereby avoiding excessive heating of the beam exit window.
REFERENCES:
patent: 1992975 (1935-03-01), Ulrey
patent: 2186380 (1940-01-01), Hirsch
patent: 3549931 (1970-12-01), DeLucia
patent: 4309637 (1982-01-01), Fetter
patent: 5128977 (1992-07-01), Danos
patent: 5136625 (1992-08-01), Heiting et al.
Bittl Herbert
Friedel Rudolf
Krogmann Henrik
Mueller Werner
Schmidt Roland
Porta David P.
Siemens Aktiengesellschaft
Wong Don
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