X-ray tube with variable focus

Details X-ray tube with variable focus X-ray tube with variable focus

1997-09-29

1998-09-22

Wong, Don

X-ray or gamma ray systems or devices

Source

Electron tube

378138, H01J 3504

Patent

active

058126325

ABSTRACT:
An x-ray tube has an evacuated housing in which an electron-emitting cathode is rigidly mounted and a rotating anode having an anode dish rotatable by a drive arrangement, which is struck by the electron beam, accelerated with an electrical field, for producing x-rays. An electromagnetic system for the deflection and focusing of the electron beam has a number of current-permeated coil elements. The cathode generates a rotationally-symmetrical circular beam, and the rotational axis of the anode dish is offset from and parallel to the axis of the electron beam by the average radius of the anode dish edge. The electromagnetic system generates a dipole-free quadrupole field that deforms the electron beam cross-section.

REFERENCES:
patent: 3732426 (1973-05-01), Shimizu
patent: 5313510 (1994-05-01), Ebersberger et al.
patent: 5581591 (1996-12-01), Burke et al.
patent: 5617464 (1997-04-01), Mika et al.

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