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X-ray tube cathode with reduced unintended electrical field emission

  • US 20070076849A1
  • Filed: 09/28/2006
  • Published: 04/05/2007
  • Est. Priority Date: 09/30/2005
  • Status: Active Grant
First Claim
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1. An x-ray source device, comprising:

  • a) an evacuated dielectric tube;

    b) an anode, disposed at an end of the tube, including a material configured to produce x-rays in response to impact of electrons; and

    c) a cathode, disposed at an opposite end of the tube opposing the anode, including a cathode element configured to produce electrons accelerated towards the anode in response to an electric field between the anode and the cathode; and

    d) an annular flange, extending from the cathode toward the anode within the tube, having a smaller diameter than an inner diameter of the evacuated tube to form an annular space between the flange and the evacuated tube, and extending closer to the anode than an interface between the cathode and the tube.

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