Patent ID: 6252936
Filing Date: 2001-06-26
Classification: H01J

Abstract:
An X-ray tube, comprising:a tube wall,an anode having a transmissive target layer for generating X-rays in response to the impingement of an electron beam;a cathode having a loop-shaped electron emissive element for generating an electron beam, the beam forming a substantially annular anode target ring on the transmissive target,an X-ray exit window, adjacent the target layer, anda thermally conductive metal cooling layer disposed with a surface against the transmissive target, the metal cooling layer being disposed substantially within the annular electron target ring, so as not to substantially block the electron beam, which metal cooling layer is thermally conductively connected to the tube wall, which metal cooling layer acts as a means for enhancing the dissipation of heat at least for the anodein which the thermally conductive metal cooling layer still further comprises a metal disk situated within the anode target ring.