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Field Emission Electron Sources for X-ray Tubes

A field emission and X-ray technology, applied in the directions of X-ray tube electrodes, X-ray tube parts, and cathode ray convergence/focusing/guidance, etc. Sputtering effects, blocking reduction, effects of large field emission enhancement factors

Active Publication Date: 2017-02-15
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent application with the publication number "CN102498539A" and the invention title "Carbon Nanotube Array for Focused Field Emission" published on June 13, 2012 discloses a similar side gate structure with a focusing structure Field emission electron source, but its carbon nanotube shielding effect is very large, and each electron source cannot fully release electrons

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  • Field Emission Electron Sources for X-ray Tubes
  • Field Emission Electron Sources for X-ray Tubes
  • Field Emission Electron Sources for X-ray Tubes

Examples

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Embodiment 1

[0026] Such as figure 1 As shown, the present invention provides a kind of field emission electron source for X-ray tube, comprising:

[0027] Anode 4, grid 2 and cathode, the grid 2 and cathode are insulated,

[0028] The cathode is composed of a first cathode 11 and a second cathode 12, adopting a nanowire structure, and the second cathode 12 is arranged in an array and connected to the first cathode 11;

[0029] The gate 2 adopts a nanowire structure, arranged in an array, and arranged at intervals with the second cathode 12 in the row and column direction, and an insulating layer is provided between the gate 2 and the first cathode 11 .

[0030] Specifically, both the cathode and the grid adopt a nanowire structure, and the second cathode of the cathode is arranged in an array, and is arranged in parallel with the grid at intervals, so that the cathode can more fully feel the effect of the electric field, thereby having a larger The emission area has a larger field emiss...

Embodiment 2

[0039] Such as Figure 6 As shown, the present invention also provides another field emission electron source for an X-ray tube, including an anode 4, a grid and a cathode 1, the grid and the cathode 1 are insulated,

[0040] The grid adopts a nanowire structure and is composed of a first grid 21 and a second grid 22, and the second grid 22 is arranged in an array and connected to the first grid 21;

[0041] The cathode 1 adopts a nanowire structure, arranged in an array, and arranged at intervals with the second grid 22 in the row and column direction, and an insulating layer 3 is provided between the cathode 1 and the first grid 21 .

[0042]Specifically, both the cathode 1 and the gate adopt a nanowire structure with a larger emission area, the cathode can more fully feel the effect of the electric field and have a larger field emission enhancement factor, and the nanowire can be a planar nanowire . The insulating layer 3 is located between the cathode 1 and the first gri...

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Abstract

The invention relates to a field emission electron source for an X-ray tube. The field emission electron source comprises an anode, grids and a cathode. A nano-wire structure is employed by the cathode which is formed by a first cathode and second cathodes. The second cathodes are in array arrangement and are connected with the first cathode. Nano-wire structures are employed by the grids which are in array arrangement, and the grids and the second cathodes are alternately arranged in a column direction. An insulating layer is arranged between the grids and the first cathode. According to the field emission electron source, a large emission area can be generated, the blocking of an electron flow by the grids is reduced, the cathodes can fully sense the effect of an electric field and has a large field emission enhancement factor, and the high temperature generated by the shocking of an electron beam and a sputtering effect are avoided to the highest extent.

Description

technical field [0001] The invention relates to a field emission electron source for an X-ray tube. Background technique [0002] The traditional cathode electron source adopts a Spindt-type structure, which uses a planar porous structure as a field emission grid, but this structure has a certain blocking effect on electron flow, and its blocking rate is about 20%. Under the impact of this strong current, various adverse effects such as high temperature evaporation and electron beam sputtering will occur. For many applications that require high current, the grid is often melted and deformed due to high heat, and the vacuum environment is also severely damaged, which seriously affects the field emission performance and reduces the life of the field emission electronic device. [0003] In the prior art, a Spindt-type field emission cathode is used, and its components include an anode, a cathode and a grid, and the grid is located above the cathode. When working, the electric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J35/06H01J35/04H01J35/14
Inventor 李冬松章健
Owner SHANGHAI UNITED IMAGING HEALTHCARE