CN217444331U

CN217444331U - Cold cathode X-ray tube and X-ray generator

Info

Publication number: CN217444331U
Application number: CN202220322002.2U
Authority: CN
Inventors: 黄芳亮
Original assignee: Haining Jingyi Electronics Co ltd
Current assignee: Haining Jingyi Electronics Co ltd
Priority date: 2022-02-17
Filing date: 2022-02-17
Publication date: 2022-09-16
Anticipated expiration: 2032-02-17

Abstract

The utility model provides a cold cathode X-ray tube and X ray generating device, cold cathode X-ray tube includes: a housing, an exit window, an anode assembly, and a cathode assembly; the shell is provided with a first mounting port and a second mounting port; the anode assembly comprises an anode post and an anode target; the exit window is mounted at the first mounting opening, and the cathode assembly is mounted at the second mounting opening; or the exit window is arranged at the second mounting opening, and the cathode assembly is arranged at the first mounting opening; the cathode assembly comprises a fixed cover and a cold cathode, the fixed cover is connected with the shell, and the cold cathode is arranged at the corresponding mounting opening and is arranged in the fixed cover; wherein the cold cathode comprises at least 2 emission regions, the emission regions comprise at least one cathode single point, and the cathode single point is disposed toward the anode target. Through the utility model provides a current cold cathode X-ray tube short service life problem.

Description

Cold cathode X-ray tube and X-ray generating device

Technical Field

The utility model relates to a field emission technical field especially relates to a cold cathode X-ray tube and X ray generating device.

Background

The X-ray tube is used for outputting X-rays, and the generated X-rays can be used for carrying out nondestructive testing on the interior of an object and are generally applied to the fields of medical treatment, security inspection, industrial flaw detection and the like. The X-ray tube generates electrons from a cathode, the electrons are accelerated by high-voltage electric fields at two ends of the cathode and the anode, the accelerated electrons impact a target surface, and X rays are generated by a bremsstrahlung mechanism. The stable high-voltage electric field is output to the cathode and the anode through the high-voltage power supply, and the vacuum packaging of the outer shell provides a high-vacuum environment, so that an electron impact event can continuously and stably operate, and finally, the continuously and stably output X rays are obtained.

The cathode is called the "heart" of the X-ray tube. X-ray tubes can be classified into hot cathode X-ray tubes and cold cathode X-ray tubes according to the electron generation mechanism. The cold cathode pulls electrons in the cathode out of the surface for emission under the action of an external strong electric field through a field emission mechanism. However, cold cathode X-ray tubes have poor stability due to the presence of cold cathodes with significant emission failures and attenuation.

Moreover, after the X-ray tube is assembled and subjected to leakage detection, exhaust treatment is needed, and the purpose of exhaust is to exhaust the gas in the cavity of the X-ray tube to the maximum extent to reach the level of ultrahigh vacuum so that the X-ray tube can keep stable operation for a long time. However, in the exhausting process, in order to remove the residual substances and gas molecules on the target surface, electrons are generally emitted through the cathode and impact the target surface with the electrons for targeting treatment, and in the process, the vacuum degree of the X-ray tube is poor, and a large risk of discharge ignition exists when high voltage is loaded, so that the operation of the cold cathode in the environment is easy to damage, and the service life of the X-ray tube is short.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a cold cathode X-ray tube and an X-ray generator, which are used to solve the problem of short service life of the existing cold cathode X-ray tube.

To achieve the above and other related objects, the present invention provides a cold cathode X-ray tube including: a housing, an exit window, an anode assembly, and a cathode assembly;

the shell is provided with a first mounting port and a second mounting port, the first mounting port is arranged at the top of the shell, and the second mounting port is arranged on the side wall of the shell;

the anode assembly comprises an anode post and an anode target, the anode post penetrates through the bottom of the shell and extends into the shell, and the anode target is arranged on the surface of one end, arranged in the shell, of the anode post and faces the exit window;

the exit window is mounted at the first mounting opening, and the cathode assembly is mounted at the second mounting opening; alternatively, the exit window is mounted to the second mounting opening, and the cathode assembly is mounted to the first mounting opening;

the cathode assembly comprises a fixed cover and a cold cathode, the fixed cover is connected with the shell, and the cold cathode is arranged at the corresponding mounting opening and is arranged in the fixed cover; wherein the cold cathode comprises at least 2 emission regions, the emission regions comprise at least one cathode single point, and the cathode single point is disposed toward the anode target.

Optionally, the number of the cathode single points is multiple, and the multiple cathode single points are arranged in the emission region at intervals.

Optionally, the cold cathode includes a cathode cover, a cathode base, a first fixed conductive member, a second fixed conductive member, and a grid, wherein an electronic channel is disposed on a side of the cathode cover facing the anode target; the cathode base is fixed in the cathode cover through the first fixed conductive piece, and the emission region is arranged on the surface of the cathode base close to one side of the electronic channel; the first fixed conductive piece is arranged on one side of the cathode base, which is far away from the electronic channel, and extends to the outer side of the cathode cover along the direction far away from the electronic channel; the grid electrode is fixed between the electronic channel and the cathode base through the second fixed conductive piece, and the second fixed conductive piece is arranged on one side, far away from the electronic channel, of the grid electrode and extends to the outer side of the cathode cover along the direction far away from the electronic channel.

Optionally, the cathode assembly includes a first electrode connecting piece and a second electrode connecting piece, one end of the first electrode connecting piece is disposed in the fixing cover and connected to the first fixing conductive piece, and the other end of the first electrode connecting piece is disposed outside the fixing cover; one end of the second electrode connecting piece is arranged in the fixed cover and is connected with the second fixed conductive piece, and the other end of the second electrode connecting piece is arranged outside the fixed cover.

Optionally, the housing is further provided with an air outlet, and the air outlet is arranged on the other side wall of the housing, which is opposite to the side wall where the second mounting opening is located.

The utility model also provides a cold cathode X-ray tube, cold cathode X-ray tube includes: a housing, an exit window, an anode target, and a cathode assembly;

the housing is provided with a mounting opening, the mounting opening is arranged at the top of the housing, and the exit window is mounted at the mounting opening;

the anode target is arranged on the surface of one side of the exit window facing the shell;

the cathode assembly comprises a cold cathode, the cold cathode is arranged at the bottom of the shell and is opposite to the anode target, the cold cathode comprises at least 2 emission regions, each emission region comprises at least one cathode single point, and the cathode single points face the anode target.

Optionally, the cold cathode includes a cathode cover, a cathode base, a first fixed conductive member, a second fixed conductive member, and a grid, wherein an electronic channel is disposed on a side of the cathode cover facing the anode target; the cathode base is fixed in the cathode cover through the first fixed conductive piece; the emission region is arranged on the surface of one side of the cathode base close to the electronic channel; the first fixed conductive piece is arranged on one side of the cathode base, which is far away from the electronic channel, and extends to the outer side of the cathode cover along the direction far away from the electronic channel; the grid electrode is fixed between the electronic channel and the cathode base through the second fixed conductive piece, and the second fixed conductive piece extends to the outer side of the cathode cover along the direction far away from the electronic channel.

Optionally, the cathode assembly includes a first electrode connecting piece and a second electrode connecting piece, one end of the first electrode connecting piece penetrates through the bottom of the housing and is disposed below the cold cathode, and is connected to the first fixed conductive piece, and the other end is disposed outside the housing; one end of the second electrode connecting piece penetrates through the bottom of the shell and is arranged below the cold cathode, the second electrode connecting piece is connected with the second fixed conductive piece, and the other end of the second electrode connecting piece is arranged on the outer side of the shell.

Optionally, the housing has an exhaust port provided in a side wall of the housing.

The utility model also provides a cold cathode X ray generating device, cold cathode X ray device includes foretell cold cathode X-ray tube.

As described above, according to the cold cathode X-ray tube and the X-ray generating device of the present invention, the plurality of emitting areas are disposed on the cold cathode X-ray tube, and the plurality of emitting areas can be used alternately or switched to be used, so as to reduce the risk of scrapping the X-ray tube and improve the production yield of the cold cathode X-ray tube; the cold cathode X-ray tube with a plurality of emission regions can meet the requirement of ray emission at the same target disk position by increasing the number of the emission regions, so that the service life of the cold cathode X-ray tube is prolonged; the cold cathode X-ray tube can satisfy various practical application's demand only adjusting the quantity and the compound mode of cold cathode emission district, and under the condition of not adjusting positive pole and exterior structure, consequently, the utility model discloses cold cathode X-ray tube's strong adaptability.

Drawings

Fig. 1 is a cross-sectional view of a cold cathode X-ray tube according to a first embodiment of the present invention.

FIG. 2a shows 2 emitter zones combined left and right according to the present invention; fig. 2b shows 2 launching areas combined up and down according to the present invention; fig. 2c shows 2 emitter zones combined as a center and outer ring of the present invention; FIG. 2d shows the 3 emitter zones of the present invention combined from left to right; FIG. 2e shows the present invention with 3 emitter zones combined from top to bottom; FIG. 2f shows the present invention with 3 emitter zones combined from the center to the outer ring; FIG. 2g shows the left and right combination of the present invention with 3 emitter zones combined from the center to the outer ring; fig. 2h shows 4 emitting areas combined up, down, left, and right according to the present invention; fig. 2i shows the emitting area of the corner combination 4 of the present invention; fig. 2j shows a first form of 5 emitting areas combined with corners in accordance with the present invention; fig. 2k shows a second version of the 5 emitter regions combined in the center and corner of the invention; fig. 2l shows a third form of the 5 emitting areas combined with the corners of the present invention.

Fig. 3a shows a circular cathode single point of the present invention; FIG. 3b shows an elliptical cathode single point of the present invention; fig. 3c shows a single cathode point in the form of a ring according to the present invention; fig. 3d shows a single point cathode of the quadrilateral shape of the present invention; fig. 3e shows the cathode single point of the edge chamfer quadrilateral of the present invention.

Fig. 4 is a cross-sectional view of the cathode assembly of the present invention.

Fig. 5 is a cross-sectional view of a cold cathode X-ray tube according to a third embodiment of the present invention.

Fig. 6 is a cross-sectional view of an X-ray generator according to a fourth embodiment of the present invention.

Fig. 7 is a cross-sectional view of an X-ray generator according to a fifth embodiment of the present invention.

Description of the element reference numerals

10 casing

101 first shell

101a first fixed part

101b first connection part

101c second fixed part

101d third connecting part

102 second shell

11 first mounting opening

12 second mounting opening

13 exhaust port

131 exhaust pipe

14 mounting port

20 exit window

30 anode assembly

31 anode column

32 anode target

311 projection

311a second connecting part

40 cathode assembly

41 fixed cover

42 cold cathode

421 emitting area

422 cathode base

423 cathode cover

423a electron channel

424 first fixed conductive member

425 second fixed conductive member

426 gate electrode

43 first electrode connecting member

44 second electrode connection

45 cathode core column

50 electrode cover

60 high voltage power supply assembly

Detailed Description

The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

Please refer to fig. 1 to 7. It should be noted that the drawings provided in the present embodiment are only schematic and illustrative of the basic idea of the present invention, and although the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation, the form, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.

Example one

As shown in fig. 1, the present embodiment provides a cold cathode X-ray tube including: a housing 10, an exit window 20, an anode assembly 30 and a cathode assembly 40.

The housing 10 has a first mounting opening 11 and a second mounting opening 12, the first mounting opening 11 is disposed at the top of the housing 10, and the second mounting opening 12 is disposed on the sidewall of the housing 10.

In this embodiment, the casing 10 includes a first casing 101 and a second casing 102, a first fixing portion 101a is disposed on the periphery of the first casing 101, a first connecting portion 101b is disposed below the first fixing portion 101a, and the first casing 101 is connected to the second casing 102 through the first connecting portion 101 b. The first housing 101 is made of a material including, but not limited to, glass, ceramic, stainless steel, oxygen-free copper, or monel, and the second housing 102 is made of an insulating material including, but not limited to, ceramic and glass. In practical applications, the first casing 101 is directly grounded for reducing the accumulation of electrons around the anode assembly 30, improving the voltage endurance of the X-ray tube, and also improving the stability of electron emission and focusing, thereby facilitating the output of stable X-rays. In this embodiment, the second mounting opening 12 is disposed above the first fixing portion 101 a.

Specifically, the housing 10 further has an exhaust port 13, and the exhaust port 13 is provided in another side wall of the housing 10 opposite to the side wall where the second mounting port 12 is located. In this embodiment, the exhaust port 13 is disposed on the sidewall of the first casing 101 and opposite to the cathode assembly 40. The exhaust port 13 is used for maximally exhausting gas in the cold cathode X-ray tube, so that the cold cathode X-ray tube reaches an ultrahigh vacuum level, so that the cold cathode X-ray tube can maintain long-term stable operation. Further, in order to facilitate the exhaust, an exhaust pipe 131 may be provided at the exhaust port 13.

The exit window 20 is mounted at the first mounting opening 11, and the cathode assembly 40 is mounted at the second mounting opening 12; alternatively, the exit window 20 is mounted to the second mounting opening 12, and the cathode assembly 40 is mounted to the first mounting opening 11.

In this embodiment, the exit window 20 is used for outputting X-rays, the material of the exit window 20 includes beryllium, and the thickness of the exit window 20 is 0.015mm to 1.2 mm. And the cathode assembly 40 serves to generate and emit electrons.

The anode assembly 30 includes an anode post 31 and an anode target 32, the anode post 31 penetrates the bottom of the housing 10 and extends into the housing 10, and the anode target 32 is disposed on the surface of the anode post 31 disposed at one end of the housing 10 and faces the exit window 20.

In this embodiment, one end of the anode post 31 is an insertion end, the insertion end penetrates through the bottom of the second housing 101 and is disposed in the first housing 101, and the other end is an exposed end and is disposed outside the second housing 102 for connecting with an external power supply. The anode column 31 is provided with a protrusion 311 at a position close to the exposed end, the protrusion 311 is disposed on the periphery of the anode column 31 and inside the second housing 102, a second connection portion 311a is disposed below the protrusion 311, and the anode column 31 is connected to the second housing 102 through the second connection portion 311 a. The upper portion of the protrusion 311 is fixedly connected to the electrode cover 50, the electrode cover 50 is used for protecting the connection portion between the second connection portion 311a and the second housing 102, the electrode cover 50 is substantially cylindrical and has a front end portion and a base end portion, the front end portion is fixed to the upper end of the protrusion 311, the front end portion is substantially truncated cone-shaped, and the base end portion is cylindrical and is smoothly connected to the front end portion.

The anode target 32 is used for receiving bombardment of electrons and generating X-rays, and is disposed on the surface of the end where the anode column 31 is disposed, and an inclined angle α is formed between a normal line of a plane where the anode target 32 is located and a center line of the anode column 31, as shown in fig. 1, the inclined angle α is set so that the anode target 32 can receive electrons from the cathode assembly 40, and at the same time, the X-rays generated by the anode target 32 can reach the exit window, and the focal plane of the anode target 32 is enlarged, and the effective focal point is reduced, so that the image quality is improved, and a clearer image is obtained. The inclination angle alpha can be set according to actual needs. In this embodiment, the anode target 32 is made of tungsten.

The cathode assembly 40 comprises a fixed cover 41 and a cold cathode 42, the fixed cover 41 is connected with the shell 10, and the cold cathode 42 is arranged at a corresponding mounting opening and is arranged in the fixed cover 41; wherein the cold cathode 42 comprises at least 2 emission regions 421, the emission regions 421 comprise at least one cathode single point, and the cathode single points are disposed toward the anode target 32.

In one embodiment, the fixing cover 41 is fixedly connected to the first housing 101 through the first mounting hole 11, and the fixing cover 41 and the first housing 101 have the same material and form a vacuum region together with the housing 10. In this embodiment, the preset angle β between the center line of the fixing cover 41 and the center line of the anode post 31 is 0, that is, the cathode assembly 40 and the anode assembly 30 are aligned in a straight line.

In another embodiment, as shown in fig. 1, the fixing cover 41 is fixedly connected to the first housing 101 through the second mounting opening 12. A preset angle β (i.e., an included angle between the center line 1 and the center line 2) is formed between the center line of the fixed cover 41 and the center line of the anode post 31, where the preset angle β is greater than 0 ° and less than or equal to 90 °, and preferably, in this embodiment, the preset angle β is 90 °, that is, the folding angle between the center line of the fixed cover 41 and the center line of the anode post 31 is 90 °. Compared with the structure with the preset angle beta of 0 degree, the distance between the anode target 32 and the exit window 20 is shortened, the distance between the focus and the exit window 20 is reduced, the object distance of X-ray imaging is further reduced, and the physical magnification of the X-ray imaging system is improved.

The emission region 421 is disposed on the surface of the cathode base 422 toward the anode target 32, and is controlled by an external power source to implement an emission start/stop, thereby generating and emitting electrons. In practical applications, a plurality of the emitting regions 421 may be alternately used in a pulse-switching manner, or may be used one by one until the emitting region is out of service and then switched to the next emitting region, so as to increase the service life of the cold cathode X-ray tube. In this embodiment, the emitting regions 421 may be formed by combining a plurality of spatial structures, and the plurality of emitting regions 421 may be at least one of a left-right combination, an upper-lower combination, a center-outer combination, and a center-corner combination (as shown in fig. 2a to 2 l), where letters A, B, C, D and E in the figures respectively indicate different emitting regions 421 of the cold cathode 42. Moreover, each of the emission regions 421 includes at least one cathode single point.

Specifically, the number of the cathode single points is plural, and the plural cathode single points are arranged in the emission region 421 at intervals.

In this embodiment, as shown in fig. 3a to 3e, the shape of the cathode single point includes any one of a circle, an ellipse, a ring, a polygon, or an edge-chamfered polygon. And, for the cathode single points of circular or elliptical shape, the diameter or length of the longer semi-axis of the cathode single points ranges from 5 μm to 1mm, and for the cathode single points of polygonal shape or edge-chamfered polygonal shape, the side length of the cathode single points ranges from 5 μm to 1 mm. The emission region 421 may be formed by using at least one cathode single dot of any one of the above-described shapes, or by combining cathode single dots of various shapes. In this embodiment, the material forming the cathode single-dots includes carbon nanotubes or graphene, but any other material capable of forming the cathode single-dots is also applicable to this embodiment.

Specifically, the cold cathode 42 includes a cathode cover 423, a cathode base 422, a first fixed conductive member 424, a second fixed conductive member 425, and a grid 426, wherein an electronic channel 423a is disposed on a side of the cathode cover 423 facing the anode target 32; the cathode base 422 is fixed in the cathode cover 423 by the first fixed conductive member 424, and the emission region 421 is disposed on a surface of the cathode base 422 on a side close to the electronic channel 423 a; the first fixed conductive element 424 is disposed on a side of the cathode base 422 away from the electronic channel 423a, and extends to an outer side of the cathode cover 423 along a direction away from the electronic channel 423 a; the gate 426 is fixed between the electronic channel 423a and the cathode base 422 through the second fixing conductive member 425, and the second fixing conductive member 425 is disposed on a side of the gate 426 away from the electronic channel 423a and extends to an outer side of the cathode cover 423 along a direction away from the electronic channel 423 a.

In this embodiment, as shown in fig. 4, the cathode cover 423 is connected to the fixing cover 41 at the second mounting hole 12, and the electron path 423a thereof is communicated with the vacuum region formed by the housing 10 through the second mounting hole 12, so that the electrons emitted from the emission region 421 can strike the target surface of the anode target 32. The cathode base 422 is fixed in the cathode housing 423 by the first fixing conductor 424, and receives a voltage through the first fixing conductor 424. The gate 426 has an opening at a position corresponding to the emitter 421 (i.e. the gate 426 is in a mesh shape), and receives a voltage through the second fixed conductive member 425. By applying a gate voltage to the gate 426 and applying a cathode voltage to the emission region 421, an electric field is formed between the gate 426 and the emission region 421, so that the emission region 421 generates electrons, and the electrons enter the electron channel 423a through the opening of the gate 426.

Specifically, the cathode assembly 40 includes a first electrode connecting member 43 and a second electrode connecting member 44, one end of the first electrode connecting member 43 is disposed in the fixing cover 41 and connected to the first fixing conductive member 424, and the other end is disposed outside the fixing cover 41; one end of the second electrode connecting member 44 is disposed inside the fixing cover 41 and connected to the second fixing conductive member 425, and the other end is disposed outside the fixing cover 41.

In this embodiment, the cathode assembly 40 further includes a cathode stem 45, the cathode stem 45 is disposed in the fixing cover 41 and is located on a side of the cathode base 422 away from the ion channel 423a, and the first electrode connectors 43 and the second electrode connectors 44 are arranged at intervals and penetrate through the cathode stem 45. One end of the first electrode connecting member 43 is disposed at one side of the cathode stem 45 and connected to the first fixed conductive member 424, and the other end is disposed at the other side of the cathode stem 45 and extends to the outside of the fixed cover 41 to be connected to an external voltage. One end of the second electrode connecting member 44 is disposed at one side of the cathode stem 45 and connected to the second fixed conductive member 425, and the other end is disposed at the other side of the cathode stem 45 and extended to the outside of the fixed cover 41 to be connected to an external voltage. Also, the first electrode connecting member 43 and the first fixed conductive member 424 and the second electrode connecting member 44 and the second fixed conductive member 425 may be welded or riveted by a metal wire or a metal skin.

Accordingly, as shown in fig. 5, the present embodiment also provides a cold cathode X-ray generation device including: the cold cathode X-ray tube described in this embodiment.

In this embodiment, the cold cathode X-ray generation device further includes a high voltage power supply unit 60, the cold cathode X-ray tube and the high voltage power supply unit 60 are integrally combined, and the high voltage power supply unit 60 supplies a high voltage of 90KV or more to the anode column 31 of the X-ray tube and supplies a low voltage (voltage not more than 3000V) to the emitter 421 and the grid 426.

Example two

As shown in fig. 6, the present embodiment also provides a cold cathode X-ray tube including a case 10, an exit window 20, an anode target 32, and a cathode assembly 40.

The housing 10 has a mounting opening 14, the mounting opening 14 is provided at the top of the housing 10, and the exit window 20 is mounted to the mounting opening 14.

In this embodiment, the housing 10 includes a first housing 101 and a second housing 102, a second fixing portion 101c is disposed on the periphery of the first housing 101, and a third connecting portion 101d is disposed at the bottom end of the first housing 101, and the first housing 101 can be connected to an external device through the second fixing portion 101c and can be connected to the second housing 102 through the third connecting portion 101 d. The material of the first casing 101 includes, but is not limited to, glass, ceramic, stainless steel, oxygen-free copper, and monel; the second housing 102 is made of an insulating material, which includes but is not limited to ceramic and glass. In practical applications, the first casing 101 is directly grounded for reducing the accumulation of electrons around the anode target 32, improving the voltage resistance of the X-ray tube, and also improving the stability of electron emission and focusing, thereby facilitating the output of stable X-rays. In this embodiment, the mounting opening 14 is provided at the top of the first housing 101 for mounting the exit window 20.

Specifically, the housing 10 has an exhaust port 13, and the exhaust port 13 is disposed on a side wall of the housing 10. In this embodiment, the exhaust port 13 is disposed on a side wall of the first housing 101, and is used for maximally exhausting gas in the cold cathode X-ray tube, so that the cold cathode X-ray tube reaches an ultra-high vacuum level, and the cold cathode X-ray tube can maintain a long-term stable operation. Further, an exhaust pipe 131 may be provided at the exhaust port 13 for facilitating the exhaust.

The exit window 20 is mounted on the mounting opening 14 and used for outputting X-rays, and is made of beryllium with a thickness of 0.015-1.2 mm.

The anode target 32 is provided on a surface of the exit window 20 facing the side of the housing 10.

In this embodiment, the anode target 32 is disposed on the surface of the exit window 20 and is disposed opposite the cathode assembly 40. When the anode target 32 is bombarded with electrons, X-rays are generated, which exit through the exit window 20. The anode target 32 can be disposed on the surface of the exit window 20 by evaporation, but the manner of disposing the anode target 32 on the exit window 20 is not limited thereto and can be selected according to practical situations. In this embodiment, the anode target 32 is made of tungsten.

The cathode assembly 40 includes a cold cathode 42, the cold cathode 42 is disposed at the bottom of the casing 10 and is opposite to the anode target 32, and includes at least 2 emission regions 421, the emission regions 421 include at least one cathode single point, and the cathode single point is disposed toward the anode target 32.

In this embodiment, the emission region 421 is disposed on the surface of the cathode base 422 facing the anode target 32, and is controlled by an external power source to start and stop emission, so as to generate and emit electrons. In practical applications, a plurality of the emitting regions 421 may be alternately pulsed and switched to be used, or may be used one by one until being disabled and then switched to be used next, so as to increase the service life of the cold cathode X-ray tube. In this embodiment, the emitting regions 421 may be formed by combining a plurality of spatial structures, and the plurality of emitting regions 421 may be at least one of a left-right combination, an upper-lower combination, a center-outer combination, and a center-corner combination (as shown in fig. 2a to 2 l), where letters A, B, C, D and E in the figures respectively represent different emitting regions 421 of the cold cathode 42. Moreover, each of the emission regions 421 includes at least one cathode single point.

Specifically, the cold cathode 42 includes a cathode cover 423, a cathode base 422, a first fixed conductive member 424, a second fixed conductive member 425, and a grid 426, wherein an electronic channel 423a is disposed on a side of the cathode cover 423 facing the anode target 32; the cathode base 422 is fixed in the cathode cover 423 by the first fixed conductive member 424, and the emission region 421 is disposed on a surface of the cathode base 422 on a side close to the electronic channel 423 a; the first fixed conductive element 424 is disposed on a side of the cathode base 422 away from the electronic channel 423a, and extends to an outer side of the cathode cover 423 along a direction away from the electronic channel 423 a; the gate 426 is fixed between the electronic channel 423a and the cathode base 422 through the second fixed conductive member 425, and the second fixed conductive member 425 is disposed on a side of the gate 426 away from the electronic channel 423a and extends to an outer side of the cathode housing 423 along a direction away from the electronic channel 423 a.

In this embodiment, as shown in fig. 4, the cathode cover 423 has an electron passage 423a, and electrons emitted from the emission region 421 can pass through the electron passage 423a and strike the target surface of the anode target 32. The cathode base 422 is fixed in the cathode housing 423 by the first fixed conductive member 424, and receives a voltage through the first fixed conductive member 424. The gate 426 has an opening at a position corresponding to the emitter 421 (i.e. the gate 426 is in a mesh shape), and receives a voltage through the second fixed conductive member 425. By applying a gate voltage to the gate 426 and applying a cathode voltage to the emission region 421, an electric field is formed between the gate 426 and the emission region 421, so that the emission region 421 generates electrons, and the electrons enter the electron channel 423a through the opening of the gate 426. In this embodiment, the cold cathode 42 is fixed by a first fixed conductive member 43 and a second fixed conductive member 44.

One end of the first electrode connecting piece 43 penetrates the bottom of the shell 10 and is arranged below the cold cathode 42, and is connected with the first fixed conductive piece 424, and the other end is arranged outside the shell 10; one end of the second electrode connecting member 44 penetrates the bottom of the housing 10 and is disposed below the cold cathode 42, and is connected to the second stationary conductive member 425, and the other end is disposed outside the housing 10. In this embodiment, one end of the first electrode connecting member 43 penetrates the bottom of the second housing 102 and is disposed in the housing 10, and is welded or riveted to the first fixed conductive member 424 by a metal wire or a metal sheet, and one end of the second electrode connecting member 44 penetrates the bottom of the second housing 102 and is disposed in the housing 10, and is welded or riveted to the second fixed conductive member 425 by a metal wire or a metal sheet.

Accordingly, as shown in fig. 7, the present embodiment also provides a cold cathode X-ray generation device including: the cold cathode X-ray tube described in this embodiment.

In this embodiment, the cold cathode X-ray generator further includes a high voltage power supply unit 60, the potential of the anode target 32 of the cold cathode X-ray tube is the same as the potential of the case 10, and the case 10 is grounded, so that the potential of the anode target 32 is 0; and the high voltage power supply assembly 60 provides the required voltage to the cathode assembly 40.

In summary, the cold cathode X-ray tube of the present invention has the advantages that the plurality of emission regions are disposed on the cold cathode X-ray tube, and the plurality of emission regions can be used alternately or switched to be used, so as to reduce the risk of scrapping the X-ray tube and improve the production yield of the cold cathode X-ray tube; the cold cathode X-ray tube with a plurality of emission regions can meet the requirement of ray emission at the same target disk position by increasing the number of the emission regions, so that the service life of the cold cathode X-ray tube is prolonged; the cold cathode X-ray tube can satisfy various practical application's demand only adjusting the quantity and the compound mode of cold cathode emission district, and not adjusting under the circumstances of positive pole and exterior structure, consequently, the utility model discloses cold cathode X-ray tube's strong adaptability. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A cold cathode X-ray tube, characterized in that it comprises: a housing, an exit window, an anode assembly, and a cathode assembly;

2. The cold cathode X-ray tube of claim 1, wherein the number of the cathode single points is plural, and the plural cathode single points are arranged at intervals in the emission region.

3. The cold cathode X-ray tube of claim 1 or 2, wherein the cold cathode comprises a cathode cover, a cathode base, a first fixed conductive member, a second fixed conductive member and a grid electrode, wherein an electron channel is provided on a side of the cathode cover facing the anode target; the cathode base is fixed in the cathode cover through the first fixed conductive piece, and the emission region is arranged on the surface of the cathode base close to one side of the electronic channel; the first fixed conductive piece is arranged on one side of the cathode base, which is far away from the electronic channel, and extends to the outer side of the cathode cover along the direction far away from the electronic channel; the grid electrode is fixed between the electronic channel and the cathode base through the second fixed conductive piece, and the second fixed conductive piece is arranged on one side, far away from the electronic channel, of the grid electrode and extends to the outer side of the cathode cover along the direction far away from the electronic channel.

4. The cold cathode X-ray tube of claim 3, wherein the cathode assembly comprises a first electrode connector and a second electrode connector, the first electrode connector having one end disposed within the stationary shield and connected to the first stationary conductive member and another end disposed outside the stationary shield; one end of the second electrode connecting piece is arranged in the fixed cover and is connected with the second fixed conductive piece, and the other end of the second electrode connecting piece is arranged outside the fixed cover.

5. The cold cathode X-ray tube of claim 1, wherein the housing further comprises an exhaust port disposed in another sidewall of the housing opposite to the sidewall where the second mounting opening is located.

6. A cold cathode X-ray tube, characterized in that it comprises: a housing, an exit window, an anode target, and a cathode assembly;

7. The cold cathode X-ray tube according to claim 6, wherein the number of the cathode single points is plural, and the plural cathode single points are arranged at intervals in the emission region.

8. The cold cathode X-ray tube according to claim 6 or 7, wherein the cold cathode comprises a cathode cover, a cathode base, a first fixed conductive member, a second fixed conductive member and a grid electrode, wherein an electron channel is provided on a side of the cathode cover facing the anode target; the cathode base is fixed in the cathode cover through the first fixed conductive piece; the emission region is arranged on the surface of one side of the cathode base close to the electronic channel; the first fixed conductive piece is arranged on one side of the cathode base, which is far away from the electronic channel, and extends to the outer side of the cathode cover along the direction far away from the electronic channel; the grid electrode is fixed between the electronic channel and the cathode base through the second fixed conductive piece, and the second fixed conductive piece extends to the outer side of the cathode cover along the direction far away from the electronic channel.

9. The cold cathode X-ray tube of claim 8, wherein the cathode assembly comprises a first electrode connector and a second electrode connector, wherein one end of the first electrode connector penetrates the bottom of the housing and is disposed below the cold cathode and is connected to the first fixed conductive member, and the other end is disposed outside the housing; one end of the second electrode connecting piece penetrates through the bottom of the shell and is arranged below the cold cathode, the second electrode connecting piece is connected with the second fixed conductive piece, and the other end of the second electrode connecting piece is arranged on the outer side of the shell.

10. The cold cathode X-ray tube of claim 6, wherein the housing has an exhaust vent provided in a sidewall of the housing.

11. A cold cathode X-ray generating device, characterized in that the cold cathode X-ray device comprises: the cold cathode X-ray tube according to any one of claims 1 to 10.