Cold cathode x-ray tube and control method therefor

A technology of an X-ray tube and a control method, which is applied in the field of cold cathode X-ray tube and its control, can solve the problems such as the reduction of vacuum degree and the reduction of anode current, and achieve the effect of preventing reduction and stable driving.

Pending Publication Date: 2020-09-15
NANOX IMAGING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the conventional cold-cathode X-ray tube, there is a problem that, for example, the degree of vacuum decreases due to the gas generated during the operation of the X-ray tube. Situations where the anode current decreases over time
[0004] In addition, although it is an example of a field emission display, Non-Patent Document 3 describes that, in the case of using a cold cathode array using a spindt-type Mo material, in an operating vacuum tube Oxidizing gases are generated, as a result, a decrease in anodic current over time

Method used

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  • Cold cathode x-ray tube and control method therefor
  • Cold cathode x-ray tube and control method therefor
  • Cold cathode x-ray tube and control method therefor

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Embodiment Construction

[0028] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0029] figure 1 (a) is a schematic cross-sectional view of the cold-cathode X-ray tube 1 according to the embodiment of the present invention. As shown in the figure, the X-ray tube 1 has a structure in which an electron emission unit 10 , an anode unit 11 , a target 12 , a focusing structure 13 , and a hydrogen generation unit 14 are arranged inside a casing 15 . The control device 2 of the X-ray tube 1 is also shown in this figure.

[0030] The casing 15 is a sealing member made of any one of glass, ceramics, and stainless steel. Although not shown, a valve is provided in the housing 15 , and the exhaust gas inside the housing 15 and gas injection into the housing 15 are performed through the valve as necessary. For example, before the cold cathode type X-ray tube 1 is operated under the control of the control device 2, the inside of the casing 15 is exha...

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Abstract

Provided is a cold cathode X-ray tube capable of preventing time-dependent decrease in anode current such that the cold cathode x-ray tube stably operates for a long period of time. A cold cathode X-ray tube (1) comprises: an electron discharge portion (10) including an electron discharging element using a cold cathode; an anode portion (11) disposed so as to be opposed to the electron discharge portion (10); a target (12) disposed on a part of the surface of the anode portion (11); a casing (15) in which the electron discharge portion (10), the anode portion (11), and the target (12) are disposed; and a hydrogen generation portion (14) made of material that generates hydrogen when electrons collide therewith and disposed at a part of the surface present inside the casing (15) other than the surface of the target (12).

Description

technical field [0001] The invention relates to a cold cathode type X-ray tube and a control method thereof. Background technique [0002] Conventional X-ray tubes use a filament as an electron emission element, and use thermal electrons emitted from the filament as an electron source. In contrast, in recent years, several X-ray tubes using cold cathodes as electron emission elements (cold cathode X-ray tubes) have been proposed (for example, Patent Documents 1 to 3). [0003] Compared with X-ray tubes using filaments as electron emission elements, cold cathode X-ray tubes have a property that the amount of electron emission is easily affected by the surface state of the cathode. Therefore, in the conventional cold-cathode X-ray tube, there is a problem that, for example, the degree of vacuum decreases due to the gas generated during the operation of the X-ray tube. A condition in which the anode current decreases over time. As a method for coping with this problem, a met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J35/02H01J35/06H01J35/08H01J35/16
CPCH01J35/20H01J2235/20H01J2235/062H01J35/065H01J35/16
Inventor 监物秀宪
Owner NANOX IMAGING
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