CN115767864A - Cold cathode microfocus X-ray tube - Google Patents
Cold cathode microfocus X-ray tube Download PDFInfo
- Publication number
- CN115767864A CN115767864A CN202211519844.8A CN202211519844A CN115767864A CN 115767864 A CN115767864 A CN 115767864A CN 202211519844 A CN202211519844 A CN 202211519844A CN 115767864 A CN115767864 A CN 115767864A
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- Prior art keywords
- ray tube
- microfocus
- cathode
- shell
- cold cathode
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- 239000000463 material Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 229910052790 beryllium Inorganic materials 0.000 claims description 3
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 239000002041 carbon nanotube Substances 0.000 abstract description 10
- 229910021393 carbon nanotube Inorganic materials 0.000 abstract description 10
- 238000010894 electron beam technology Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000005036 potential barrier Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a cold cathode microfocus X-ray tube, which comprises a shell, wherein a wire outlet port is integrally formed at the outer side of one end of the middle part of the shell, a clamping seat is arranged at one end, far away from the shell, of the wire outlet port, and a window is clamped in the clamping seat; the vacuum cavity is arranged inside the shell, a cathode base is arranged at one end, located inside the vacuum cavity, of the shell, and a grid is arranged at one end, close to the vacuum cavity, of the cathode base. The cathode base is arranged, the cathode base plays a role of providing electrons in an X-ray tube, the carbon nano tube cold cathode is adopted as the electron source, the defects of the traditional hot cathode can be effectively overcome, the shape and the size of the cathode emission source have obvious influence on the focusing of electron beam spots, the concentric ring with the maximum outer diameter of twenty-five micrometers is used as the electron source in the cathode base of the device, the problem of heating of the electron source is avoided, and the service life of the device is prolonged.
Description
Technical Field
The invention relates to the field of X-ray tubes, in particular to a cold cathode microfocus X-ray tube.
Background
The X-ray tube is a vacuum diode operating at high voltage. Comprises two electrodes: one is a filament for emitting electrons as a cathode, and the other is a target for receiving electron bombardment as an anode. Both stages are sealed within a high vacuum glass or ceramic housing.
With the development of science and technology, the market has an urgent need for a microfocus X-ray tube, and although the traditional hot cathode microfocus X-ray tube can meet the requirements to a certain extent, the traditional hot cathode microfocus X-ray tube has the disadvantages of slow starting speed, short service life, large equipment volume, insufficient time and space resolution and the like, so that a cold cathode microfocus X-ray tube needs to be designed.
Disclosure of Invention
The present invention is directed to a cold cathode microfocus X-ray tube, which solves the above-mentioned problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a cold cathode microfocus X-ray tube comprises
The cable outlet port is integrally formed on the outer side of one end of the middle of the shell, a clamping seat is arranged at one end, away from the shell, of the cable outlet port, and a window is clamped inside the clamping seat;
the vacuum cavity is arranged in the shell, a cathode base is arranged at one end of the shell, which is positioned in the vacuum cavity, a grid is arranged at one end of the cathode base, which is close to the vacuum cavity, a first focusing electrode is arranged at the outer side of the cathode base, which is close to the grid, and a second focusing electrode is arranged at the outer side of the first focusing electrode;
the positive pole cover, the positive pole cover is established and is arranged in inside one side that the negative pole base was kept away from to the shell, the fixed cover in middle part of positive pole cover has connect the stem, one side surface that the stem is close to the second focusing electrode is provided with the target plate.
Furthermore, insulating sleeves are fixedly sleeved at two ends of the cathode base, a first wiring terminal is fixedly sleeved inside each insulating sleeve, and one side, close to the grid electrode, of each first wiring terminal is fixedly connected with a first focusing electrode.
Furthermore, a second binding post is fixedly connected to the middle of the grid, and one end, far away from the grid, of the second binding post penetrates through the cathode base and is arranged outside the shell.
Furthermore, the inside joint of first focus utmost point has first lens, the inside joint of second focus utmost point has the second lens.
Furthermore, both ends of the grid and the cathode base are provided with insulating pads.
Further, the window is made of beryllium.
Furthermore, the core column is made of a copper material.
Furthermore, the insulating sleeve and the insulating pad are both made of ceramic materials.
Furthermore, the target sheet is made of tungsten materials.
Furthermore, the shell is made of transparent insulating glass materials.
Compared with the prior art, the invention has the beneficial effects that:
1. the cathode base is arranged, the cathode base plays a role in providing electrons in the X-ray tube, the carbon nano tube cold cathode is used as the electron source, the defects of the traditional hot cathode can be effectively overcome, the shape and the size of a cathode emission source have obvious influence on the focusing of electron beam spots, the concentric ring with the maximum outer diameter of twenty-five microns is used as the electron source in the cathode base, the problem of heating of the electron source is avoided, and the service life of equipment is prolonged;
2. according to the invention, the grid electrode is arranged and also called as a modulation electrode, the grid electrode in the device is in a round hole shape, and a strong electric field is formed between the cathode base and the grid electrode by applying voltage on the grid electrode, so that the surface potential barrier of the carbon nanotube cathode is reduced to realize the field emission of electrons, and the control of the field emission current of the carbon nanotube can be realized by adjusting the voltage of the grid electrode, thereby providing feasible support for the final programmable pulse type X-ray tube;
3. the electron source is provided with a first lens and a second lens, and electrons emitted from the electron source move forwards in a divergent mode, so that the motion trail of the electron beam is restrained by the first focusing electrode and the second focusing electrode, and the electron beam can be converged on a target sheet at one side of the core column.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a cold cathode microfocus X-ray tube according to the present invention;
FIG. 2 is a schematic view of the vacuum chamber of a cold cathode microfocus X-ray tube according to the present invention;
FIG. 3 is a schematic view of a target mounting of a cold cathode microfocus X-ray tube according to the present invention;
FIG. 4 is an enlarged view of the cold cathode microfocus X-ray tube of the present invention at A in FIG. 2;
fig. 5 is an enlarged schematic view of the cold cathode microfocus X-ray tube of the present invention at B in fig. 3.
In the figure: 1. a housing; 2. a wire outlet port; 3. a card holder; 4. a window; 5. a vacuum chamber; 6. a cathode base; 7. a gate electrode; 8. a first focusing electrode; 9. a second focusing electrode; 10. an anode sleeve; 11. a stem; 12. target sheet; 13. an insulating sleeve; 14. a first terminal post; 15. a second terminal; 16. a first lens; 17. a second lens; 18. an insulating pad.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: a cold cathode microfocus X-ray tube comprises
The cable connector comprises a shell 1, wherein a cable outlet port 2 is integrally formed on the outer side of one end of the middle part of the shell 1, a clamping seat 3 is arranged at one end, away from the shell 1, of the cable outlet port 2, and a window 4 is clamped in the clamping seat 3;
the vacuum cavity 5 is arranged in the shell 1, a cathode base 6 is arranged at one end of the shell 1, which is positioned in the vacuum cavity 5, a grid 7 is arranged at one end of the cathode base 6, which is close to the vacuum cavity 5, a first focusing electrode 8 is arranged at the outer side of the cathode base 6, which is close to the grid 7, and a second focusing electrode 9 is arranged at the outer side of the first focusing electrode 8;
According to the invention, the two ends of the cathode base 6 are fixedly sleeved with the insulating sleeves 13, the first binding posts 14 are fixedly sleeved in the two insulating sleeves 13, one sides of the two first binding posts 14, which are close to the grid 7, are fixedly connected with the first focusing electrode 8, the grid 7 is arranged, the grid 7 is also called a modulation electrode, the grid 7 in the device is in a round hole shape, and voltage is applied on the grid 7, so that a strong electric field is formed between the cathode base 6 and the grid 7, the surface potential barrier of the carbon nanotube cathode is reduced, the field emission of electrons is realized, the control of the field emission current of the carbon nanotube can be realized by adjusting the voltage of the grid 7, and feasible support is provided for the final programmable pulse X-ray tube;
in the invention, the middle part of the grid 7 is fixedly connected with a second binding post 15, and one end of the second binding post 15, which is far away from the grid 7, penetrates through the cathode base 6 and is arranged outside the shell 1;
according to the invention, the first lens 16 is clamped in the first focusing electrode 8, the second lens 17 is clamped in the second focusing electrode 9, and by arranging the first lens 16 and the second lens 17, because electrons emitted from an electron source move forwards in a divergent mode, the motion track of an electron beam needs to be constrained by the first focusing electrode 8 and the second focusing electrode 9, so that the electron beam can be converged on the target sheet 12 on one side of the core column 11;
in the invention, two ends of the grid 7 and the cathode base 6 are provided with insulating pads 18;
in the invention, the window 4 is made of beryllium material;
in the invention, the core column 11 is made of copper material, and by arranging the core column 11, the anode sleeve 10 needs to dissipate heat, so the materials except the target sheet 12 are usually made of copper, thereby realizing heat dissipation;
in the invention, the insulating sleeve 13 and the insulating pad 18 are both made of ceramic materials;
in the invention, the target sheet 12 is made of tungsten material;
the housing 1 of the present invention is made of a transparent insulating glass material.
The working principle is as follows: the grid 7 in the device selects a circular hole shape, voltage is applied on the grid 7, so that a strong electric field is formed between the cathode base 6 and the grid 7, the surface potential barrier of the carbon nanotube cathode is reduced to realize field emission of electrons, the control on the field emission current of the carbon nanotube can be realized by adjusting the voltage of the grid 7, the cathode base 6 plays a role in providing electrons in an X-ray tube, a carbon nanotube cold cathode is adopted as an electron source, the defects of the traditional hot cathode can be effectively overcome, the shape and the size of a cathode emission source have obvious influence on the focusing of electron beam spots, the cathode base 6 in the device uses a concentric ring with the maximum outer diameter of twenty-five micrometers as the electron source, and the problem of heating of the electron source is avoided.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A cold cathode microfocus X-ray tube, comprising: the cold cathode microfocus X-ray tube comprises
The cable connector comprises a shell (1), wherein a cable outlet port (2) is integrally formed at the outer side of one end of the middle part of the shell (1), a clamping seat (3) is arranged at one end, away from the shell (1), of the cable outlet port (2), and a window (4) is clamped in the clamping seat (3);
the vacuum cavity (5) is arranged inside the shell (1), a cathode base (6) is arranged at one end, located inside the vacuum cavity (5), of the shell (1), a grid (7) is arranged at one end, close to the vacuum cavity (5), of the cathode base (6), a first focusing electrode (8) is arranged on the outer side, close to the grid (7), of the cathode base (6), and a second focusing electrode (9) is arranged on the outer side of the first focusing electrode (8);
anode sleeve (10), anode sleeve (10) set up in shell (1) keep away from inside one side of negative pole base (6), the fixed cover in middle part of anode sleeve (10) has been cup jointed stem (11), a side surface that stem (11) are close to second focusing pole (9) is provided with target piece (12).
2. A cold cathode microfocus X-ray tube according to claim 1, characterized in that: insulating cover (13) have all been fixed to the both ends of negative pole base (6) and have been cup jointed, two the inside of insulating cover (13) is all fixed the cup jointing and is had first terminal (14), two one side fixed connection first focus pole (8) that first terminal (14) are close to grid (7).
3. A cold cathode microfocus X-ray tube according to claim 1, characterized in that: the middle part of the grid (7) is fixedly connected with a second binding post (15), and one end, far away from the grid (7), of the second binding post (15) penetrates through the cathode base (6) to be arranged outside the shell (1).
4. A cold cathode microfocus X-ray tube according to claim 1, characterized in that: the inside joint of first focus utmost point (8) has first lens (16), the inside joint of second focus utmost point (9) has second lens (17).
5. A cold cathode microfocus X-ray tube according to claim 2, characterized in that: and insulating pads (18) are arranged at two ends of the grid (7) and the cathode base (6).
6. A cold cathode microfocus X-ray tube according to claim 1, characterized in that: the window (4) is made of beryllium material.
7. A cold cathode microfocus X-ray tube according to claim 1, characterized in that: the core column (11) is made of a copper material.
8. The cold cathode microfocus X-ray tube of claim 5, wherein: the insulating sleeve (13) and the insulating pad (18) are both made of ceramic materials.
9. A cold cathode microfocus X-ray tube according to claim 1, characterized in that: the target (12) is made of tungsten material.
10. A cold cathode microfocus X-ray tube according to claim 1, characterized in that: the shell (1) is made of transparent insulating glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211519844.8A CN115767864A (en) | 2022-11-30 | 2022-11-30 | Cold cathode microfocus X-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211519844.8A CN115767864A (en) | 2022-11-30 | 2022-11-30 | Cold cathode microfocus X-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115767864A true CN115767864A (en) | 2023-03-07 |
Family
ID=85342052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211519844.8A Pending CN115767864A (en) | 2022-11-30 | 2022-11-30 | Cold cathode microfocus X-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115767864A (en) |
-
2022
- 2022-11-30 CN CN202211519844.8A patent/CN115767864A/en active Pending
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20230307 |
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| WD01 | Invention patent application deemed withdrawn after publication |