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x-ray tube device

A technology of X-ray tube and coil, which is applied in the direction of X-ray tube, X-ray tube electrode, X-ray tube cathode assembly, etc. It can solve the problems of filament contacting cathode cup and filament electron deviation, etc., and achieve the effect of preventing filament from contacting cathode cup

Active Publication Date: 2020-06-16
CANON ELECTRON TUBES & DEVICES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Filament deflection may cause electrons to deviate from the focus position on the anode target
There is also the possibility of the filament touching the cathode cup (filament contact)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0051] figure 1 It is a schematic diagram showing an example of the X-ray tube 1 according to the first embodiment. The first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0052] The X-ray tube 1 includes a vacuum container 10 , an anode structure 20 , and a cathode structure 30 . The vacuum vessel 10 is formed of, for example, a glass bulb made of glass. The vacuum container 10 is provided with an anode structure 20 and a cathode structure 30 inside maintaining a vacuum atmosphere.

[0053] The anode structure 20 includes a substantially umbrella-shaped anode target (target disk) 21 and a rotation mechanism 23 . The anode target 21 is formed in an umbrella-shaped substantially disk shape. The umbrella-shaped surface of the anode target 21 collides with electrons (electron beams), thereby radiating X-rays. The anode target 21 is supported by the rotation mechanism 23 . The anode target 21 rotates as the rotation mechanism 2...

Deformed example 1

[0089] The X-ray tube 1 of Modification 1 of Embodiment 1 is different from the X-ray tube 1 of Embodiment 1 in that, in the electron emission source, for example, the electron emission source 321R, the corners CP1 and CP2 of the leg portion LG11 are located in the gap CL11 It is outside the range sandwiched by the recess 412 and the recess 414 .

[0090] Figure 10A and Figure 10B It is a cross-sectional view showing an example of the structure of the electron emission source 321R of the X-ray tube 1 according to Modification 1 of Embodiment 1. Figure 10A and Figure 10B In , the boundary position on the opening side of the range sandwiched by the recess 412 and the recess 414 is referred to as a position UP, and the boundary position on the bottom side thereof is referred to as a position BP. Figure 10A is an enlarged cross-sectional view of an example of the electron emission source 321R. Figure 10B It is an enlarged cross-sectional view of an example of the front e...

Deformed example 2

[0098] The X-ray tube 1 according to Modification 2 of Embodiment 1 is different from the X-ray tube 1 described above in that the electron emission source, for example, the protrusion PR1 and the protrusion PR2 of the support terminal 401F in the electron emission source 321R are joined.

[0099] Figure 12A and Figure 12B It is a cross-sectional view showing an example of the structure of an electron emission source 321R of an X-ray tube according to Modification 2 of Embodiment 1. Figure 12A is an enlarged cross-sectional view of an example of the electron emission source 321R. Figure 12B It is an enlarged cross-sectional view of an example of the front end portion TP11 of the leg portion LG11.

[0100] exist Figure 12A In the example shown, the front end portion TP11 of the leg portion LG11 is disposed in the gap CL11 and located between the recess 412 and the recess 414 . exist Figure 12BIn the shown example, the protrusion PR1 and the protrusion PR2 of the supp...

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PUM

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Abstract

Embodiments of the present invention relate to an X-ray tube and a method of manufacturing the X-ray tube. The present invention provides an X-ray tube and a method for manufacturing the X-ray tube capable of preventing filament deviation of a cathode. The X-ray tube according to the embodiment has a cathode, and the cathode includes: a filament having a coil and a leg, the coil releases electrons, the leg extends from the coil to the front end, and has a corner at the front end; The supporting terminal of the opening and the bottom, the opening is formed by the opening of the gap, the bottom is located at the end of the gap on the opposite side of the opening; and a cathode cup connected to the supporting terminal, the cathode cup accommodates the filament and the supporting terminal, and the supporting terminal has A convex portion protruding in the gap is closer to the bottom side than the front end portion of the leg portion and engages with the corner portion of the leg portion.

Description

[0001] This application is based on Japanese patent application 2017-003524 (application date: January 12, 2017), and enjoys the priority of this Japanese patent application. This application refers to the above-mentioned Japanese patent application, including all the contents of the Japanese patent application. technical field [0002] The invention relates to an X-ray tube and a method for manufacturing the X-ray tube. Background technique [0003] The X-ray tube includes a cathode that emits electrons and an anode target that emits X-rays by colliding with the emitted electrons in a vacuum container in a vacuum atmosphere. The cathode has an electron emission source and a cathode cup for accommodating the electron emission source. The electron emission source consists of a filament that emits electrons and a support terminal that supports the filament. A filament is provided electrically insulated from the cathode cup. The filament is joined to the supporting terminal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J35/08H01J9/18
CPCH01J9/18H01J35/08H01J35/066H01J35/064H01J35/153H01J9/042H01J35/065H01J2235/06
Inventor 熊抱广之斋藤友伸阿武秀郎
Owner CANON ELECTRON TUBES & DEVICES CO LTD