Patent ID: 9514911
Filing Date: 2016-12-06
CPC Classification: H01J

Claim Text:
1. An aperture body for use in an x-ray tube that provides an evacuated interior having an anode and a cathode, the aperture body comprising: an electron shield having an electron collection surface including one or more expansion joints formed therein, the electron shield configured to intercept backscattered electrons from the anode; an electron shield aperture defined in the electron shield through which electrons may pass between the cathode and the anode; a vacuum wall separated by a gap from the electron shield and shielded from the backscattered electrons by the electron shield, wherein the gap is disposed within the evacuated interior and is in fluid communication with the evacuated interior, wherein the vacuum wall is electrically coupled to the electron shield such that the aperture body is electrically grounded during operation of the X-ray tube; and a vacuum wall aperture defined in the vacuum wall through which electrons may pass between the cathode and the anode.