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Grid-controlled x-ray tube with cold cahtode of carbon nanotube

A carbon nanotube and cold cathode technology, which is applied in the directions of X-ray tube electrodes and X-ray tube parts, etc., can solve the problem of inability to realize emission electron beam focusing and tube current regulation, X-ray tube cathode heating, and short cathode working life. And other issues

Inactive Publication Date: 2004-12-22
谭大刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a grid-controlled carbon nanotube cold cathode X-ray tube, the purpose of which is to solve the problem that the heating of the cathode of the X-ray tube needs a special power supply, and when the metal tip cold cathode is used, the working life of the cathode is short and the emission of electrons cannot be achieved. Problems in beam focusing and tube current regulation

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  • Grid-controlled x-ray tube with cold cahtode of carbon nanotube
  • Grid-controlled x-ray tube with cold cahtode of carbon nanotube
  • Grid-controlled x-ray tube with cold cahtode of carbon nanotube

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Embodiment Construction

[0016] See attached figure 1 , the figure only draws the structural part of the cathode, and the X-ray tube cathode emitter is made of a carbon nanotube membrane 3, and a carbon nanotube array is directionally grown on a specific emission area in the center of the membrane 3. The emitting sheet can emit electrons under the corresponding emission electric field without heating.

[0017] The back side of the carbon nanotube diaphragm 3 has a conductive lead-out piece 4, which is drawn out of the X-ray tube shell 8 through the cathode lead-out wire 5. The diaphragm 3 is isolated from the grid sheet 4 and the cathode assembly casing 1 by an insulating gasket 7 and is not electrically conductive to each other.

[0018] The grid sheet 2 is made of a thin metal sheet with fine mesh, located on one side of the carbon nanotube membrane 3 and parallel to it. The area and shape of the mesh portion in the center of the grid sheet 2 correspond to the specific emission area and shape of t...

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Abstract

The present invention relates to the improvement of X-ray tube and features the carbon nanotube film as cathode electron emitter. The film has carbon nanotube array in the central emitting plane and the grid plate is set in the corresponding position to the film. The grid plate is fixed onto the casing of the cathode combination and conducted with the cathode combination. The carbon nanotube film, the grid plate and the casing of the cathode combination are isolated with insulating gasket. When the X-ray tube is used, one additional voltage Ugk is applied between the grid and the cathode to regulate the tube current. The present invention aims at providing X-ray tube with no special cathode heating power source life, focused emitted electron beam and controlled tube current.

Description

1. Technical field: [0001] The invention relates to the significant improvement of the working principle, structural material and power supply circuit of the existing X-ray tube. 2. Background technology: [0002] Traditional X-ray tubes use direct-heating (tungsten) filament thermionic emission cathodes, except for a very small number of special X-ray tubes (such as capacitive discharge power supply wave tail cut off or pulse work) without additional grid. The thermionic emission cathode requires a special power supply, which consumes a lot of heat and has a limited working life. In addition, the cathode of most constant voltage X-ray tubes is at a negative high voltage potential, and its filament power supply needs to use a special high-voltage resistant filament transformer to isolate the negative high voltage, which is large in size and high in manufacturing cost. [0003] Using the principle of single metal tip discharge field emission as the X-ray tube cold cathode ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J35/04H01J35/06
Inventor 谭大刚
Owner 谭大刚