CN201378580Y - Gate-controlled carbon nano-cathode field emission X-ray tube - Google Patents
Gate-controlled carbon nano-cathode field emission X-ray tube Download PDFInfo
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- CN201378580Y CN201378580Y CN200920106848U CN200920106848U CN201378580Y CN 201378580 Y CN201378580 Y CN 201378580Y CN 200920106848 U CN200920106848 U CN 200920106848U CN 200920106848 U CN200920106848 U CN 200920106848U CN 201378580 Y CN201378580 Y CN 201378580Y
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Abstract
The utility model discloses a gate-controlled carbon nano-cathode field emission X-ray tube, comprising a radiator, anode components, a vacuum container, cathode components and a wiring tube, wherein, the anode components comprise a transition ring, an anode sealing part, an anode target component, an exit window and an anode cap, and the cathode components comprise a cathode cover, a set screw, a core column cap, a core column, a cathode sealing part, a first insulating ring, a cathode holder, a carbon nano-cathode, a shielding ring, a second insulating ring and a gate. The X-ray tube utilizes the good emission feature of the carbon nano-cathode to use the carbon nano-cathode as one part of the cathode components to be sealed in the vacuum container; an electron beam is pulled out from the surface of the carbon nano-cathode by a gate electric field, and the pulled-out electron beam bombards the anode target at high speed under the excitation of an anode high-voltage electric field and the focusing of the cathode cover. The gate-controlled carbon nano-cathode field emission X-ray tube has the characteristics of high voltage and high penetration, can steadily and continuously work at high voltage, and can output a certain of focal spot and of electron beam of the beam current size.
Description
Technical field
The utility model relates to a kind of X-ray tube, particularly relates to a kind of grid-control nanocarbon cathode field emission X-ray pipe.
Background technology
X-ray tube is to utilize high-velocity electrons bump metal target surface to produce the vacuum electron device of X ray.
Traditional X-ray tube generally adopts hot cathode, and materials such as tungsten, six lanthanum molybdenums are heated to high enough temp, makes the big electronics of a part of kinetic energy overcome the body surface potential barrier and overflows externally, forms the electron beam emission.Therefore this kind X-ray tube energy consumption is big, and need satisfy big electric current, resistant to elevated temperatures instructions for use.
Field emission does not need to negative electrode heating, utilizes highfield to make near the body surface electronics pass surface potential barrier and launches; The intensity of field emission depends on the work function and the surface texture of material.Field-causing electron emitting cathode electron source has advantages such as energy consumption is low, emission lifetime is long, emissive porwer is big.
Carbon nano-tube is a kind of allotrope of carbon, as monodimension nanometer material, because of it has good field emission characteristic, lower cut-in voltage, stable chemical property reaches lower characteristics such as vacuum environment requirement, and aspect field emitting electronic source, have broad application prospects, utilize carbon nano-tube to become the much-talked-about topic of this area in recent years as field emmision material.
Use carbon nanotube cathod field emission X-ray tube to compare with traditional hot cathode ray tube X-ray machine, have light, as to start fast (need not preheating), power saving advantage as radiogenic portable machine.Especially the last item, for the portable machine of making power supply of storage battery, the carbon nanotube cathod X-ray tube has very big advantage.
In the existing patented technology, carbon nano-tube being applied to X-ray tube as negative electrode, mainly is three utmost point X-ray tubes that have gate modulation structure, i.e. anode, grid and negative electrode.From the patent retrieval situation, at present carbon nano-tube is had two parts as the domestic patent that negative electrode is applied to X-ray tube: 1, the patent No. is 03127012.3, " a kind of medical miniature X-ray tube of novel field emission ", this tubular construction is the end window construction, no electron-beam convergence does not have concrete electrical quantity sign on embodiment; 2, the patent No. is 03133383.4, " low-voltage field emitting cathode X-ray tube ", and this pipe is that on embodiment, anode is pressurised into 600V not with the side window structure of anode cap.
From the documents and materials that can inquire, existing gate modulation structure emission X-ray tube all has certain limitation.The one, be difficult in and add higher voltage between the anode and cathode, institute adds ceiling voltage and is no more than 20kV at present, owing to can't add high voltage, its ray penetration power is relatively poor; The 2nd, be difficult in work continual and steady under the high voltage; The 3rd, the beam of emission is not assembled in many cases.
The utility model content
In view of above-mentioned the deficiencies in the prior art, main purpose of the present utility model is to provide a kind of grid-control formula X-ray tube for emission in carbon nanometer cathode field that has high voltage, high-penetration characteristics and have certain convergence.
In order to achieve the above object, grid-control nanocarbon cathode field emission X-ray pipe described in the utility model has adopted following technical proposals:
Described grid-control nanocarbon cathode field emission X-ray pipe comprises radiator, anode assemblies, vacuum tank, cathode assembly and wire barrel, and described anode assemblies one end and radiator are installed together, and the other end is encapsulated in the vacuum tank; Described cathode assembly is encapsulated in the vacuum tank, and one end and described wire barrel link together.
Wherein, described anode assemblies is for comprising transition rings, anode closure, plate target assembly, exit window and anode cap.Transition rings is for being sheathed on the plate target assembly and being connected with the anode closure, and described anode closure is for being packaged on vacuum tank one end; Described plate target assembly one end is for stretching out vacuum tank and being connected with radiator, and the described plate target assembly other end is embedded with the plate target at certain inclination angle; Described anode cap is to be sheathed on the other end end of this plate target assembly and to be encapsulated in the vacuum tank with this end; Described exit window is located at the side of this described anode cap over against plate target.Described cathode assembly comprises cathode shield, hold-down screw, core column cap, stem stem, negative electrode closure, first dead ring, negative electrode holder, carbon nanometer negative electrode, shading ring, second dead ring and grid.Described stem stem, first dead ring and negative electrode holder are for to be fixed together by core column cap and stem stem wire bonds; Carbon nanometer negative electrode is positioned in the negative electrode holder, it also is connected with described stem stem lead-in wire; Described shading ring, second dead ring, grid are for assembling with carbon nanometer negative electrode in regular turn; Described cathode shield is located at outside described negative electrode closure, stem stem, first dead ring, negative electrode holder, core column cap, carbon nanometer negative electrode, shading ring, second dead ring and the grid, by hold-down screw with described stem stem is fixed; Described negative electrode closure one end and stem stem join, and the other end then is connected in vacuum tank.
In described grid-control nanocarbon cathode field emission X-ray pipe, high pressure is for introducing by the radiator that links together with anode assemblies, and between carbon nanometer negative electrode and grid, add low voltage, by the grid electric field electron beam is pulled out from this carbon nanometer cathode surface, the electron beam of pulling out bombards plate target at a high speed under the effect of high voltage electric field between anode and cathode, thereby produces required X ray.
Reach control carbon nanometer cathodic field emission line size by regulating and control this control gate pole tension, and utilize cathode shield that field emission electron Shu Jinhang is focused on.Certain proportion is launched line pull out by apply high pressure at anode, and under specific cathode shield structure, focus on, bombard plate target at a high speed.
Compared to existing technology, grid-control nanocarbon cathode field emission X-ray pipe described in the utility model has following characteristics and advantage:
1, the characteristics that have high voltage, high-penetration, anode can be added to the voltage that is higher than 100kV, can produce the high-penetration X ray, therefore, can be widely used in technical fields such as safety inspection, medical diagnosis and defect detecting test.
2, has launching effect preferably.Unique gate modulation structure, negative electrode focusing structure and rational anode cathode separation have guaranteed to have the focal spot of the definite shape and the size of using value.
3, under high voltage, can stablize the certain hour of working constantly.
Description of drawings
Fig. 1 is the overall structure schematic diagram of grid-control nanocarbon cathode field emission X-ray pipe described in the utility model;
Fig. 2 is the structural representation of the cathode assembly shown in the utility model.
Embodiment
Grid-control nanocarbon cathode field emission X-ray pipe described in the utility model is described in further detail with using below in conjunction with accompanying drawing and concrete assembling process.
Grid-control nanocarbon cathode field emission X-ray pipe described in the utility model is by utilizing carbon nanometer negative electrode to have the characteristics of good field emission, and with this carbon nanometer negative electrode as a part of sealing-in of cathode assembly in vacuum tank, and electron beam is pulled out from carbon nanometer cathode surface by the grid electric field, the electron beam of pulling out is under the excitation of anode high voltage electric field and under the focusing of cathode shield, remove to bombard plate target at a high speed, thereby produce X ray.
Shown in Fig. 1, grid-control nanocarbon cathode field emission X-ray pipe described in the utility model comprises that vacuum tank 3, radiator 1, part are connected with radiator 1 and another part is to be encapsulated in anode assemblies 2 in the vacuum tank 3, to be encapsulated in interior cathode assembly 4 of vacuum tank 3 and the wire barrel 5 that is connected with cathode assembly 4.
See Fig. 1, described anode assemblies 2 is for mainly comprising transition rings 21, anode closure 22, plate target assembly 23, exit window 24 and anode cap 25; Wherein, described transition rings 21 is connected for being sheathed on the plate target assembly 23 and with described anode closure 22, and described anode closure 22 is to be connected with vacuum tank 3, and plate target assembly 23 parts are packaged in the vacuum tank 3; Described plate target assembly 23 1 ends are connected with radiator 1 for stretching out vacuum tank 3, are embedded with the plate target 231 at certain inclination angle in this described plate target assembly 23; Described anode cap 25 is packaged on vacuum tank 3 interior those ends for being sheathed on described plate target assembly 23, and described exit window 24 is located at the side of this described anode cap 25 over against plate target 231.
Shown in Fig. 1 and Fig. 2, described cathode assembly 4 mainly comprises cathode shield 41, hold-down screw 42, core column cap 43, stem stem 44, negative electrode closure 45, first dead ring 460, negative electrode holder 47, carbon nanometer negative electrode 48, shading ring 49, second dead ring 461 and grid 40.Wherein, described stem stem 44, first dead ring 460 and negative electrode holder 47 are to be weldingly fixed on stem stem lead-in wire 6 by core column cap 43, carbon nanometer negative electrode 48 are positioned over itself and described stem stem lead-in wire 6 are connected; Described shading ring 49, second dead ring 461 are assembled in carbon nanometer negative electrode 48 all sides for stack in regular turn; Described grid 40 is for being installed on second dead ring 461 and being positioned on the described carbon nanometer negative electrode 48; Described cathode shield 41 is for being located at outside described negative electrode closure 45, stem stem 44, first dead ring 460, negative electrode holder 47, core column cap 43, carbon nanometer negative electrode 48, shading ring 49, second dead ring 461 and the grid 40, and is by hold-down screw 42 that itself and described stem stem 44 is fixing; Described negative electrode closure 45 1 ends are for to be connected with stem stem 44, and the other end then is connected in vacuum tank 3.
In addition, described carbon nanometer negative electrode 48 must be sealed off under the super-clean environment before the described grid-control nanocarbon cathode field emission X-ray pipe tubulature for adopting the vacuum-packed mode that stores.Referring to Fig. 2, in the utility model, for cathode assembly 4, its when tubulature at first with stem stem 44, first dead ring 460, negative electrode holder 47 by core column cap 43 and stem stem 6 firm welding that go between; Put into carbon nanometer negative electrode 48, second dead ring 461, shading ring 49 and grid 40 and then in regular turn; Again cathode shield 41 is fixed on the stem stem 44 by hold-down screw 42 at last, and this cathode assembly 4 is positioned in the vacuum tank 3.
Described grid-control nanocarbon cathode field emission X-ray pipe is for to make by special vacuum technologies such as a series of vacuum brazing, vacuum material sealing-in, vacuum degassing, casting targets in vacuum.Described grid 40 can adopt aperture plate or fenestra mode, and promptly in the practical application, described grid 40 can be aperture plate or fenestra plate.And the spacing between described grid 40 and the carbon nanometer negative electrode 48 is 0.1～2mm.
In addition, in grid-control nanocarbon cathode field emission X-ray pipe described in the utility model, high pressure is for introducing by the radiator 1 that links together with anode assemblies 2, and can add low voltage between carbon nanometer negative electrode 48 and grid 40.
Grid-control nanocarbon cathode field emission X-ray pipe described in the utility model can go to control the size of emission line by 40 making alives of regulation and control grid under the anode high voltage operating state.
Shown in Fig. 2, unique negative electrode focusing structure, promptly, carbon nanometer negative electrode 48, shading ring 49, second dead ring 461, grid 40 and be located at this described carbon nanometer negative electrode 48, cathode shield 41 on shading ring 49, second dead ring 461 and the grid 40 can be realized the electron beam output of certain focal spot and line size.
Claims (4)
1. a grid-control nanocarbon cathode field emission X-ray pipe is characterized in that, comprises radiator, anode assemblies, vacuum tank, cathode assembly and wire barrel, and described anode assemblies one end and radiator are installed together, and the other end is encapsulated in the vacuum tank; Described cathode assembly is encapsulated in the vacuum tank, and one end and described wire barrel link together;
Wherein, described anode assemblies is for comprising transition rings, anode closure, plate target assembly, exit window and anode cap; Transition rings is for being sheathed on the plate target assembly and being connected with the anode closure, and described anode closure is for being packaged on vacuum tank one end; Described plate target assembly one end is for stretching out vacuum tank and being connected with radiator, and the described plate target assembly other end is embedded with the plate target at certain inclination angle; Described anode cap is to be sheathed on the other end end of this plate target assembly and to be encapsulated in the vacuum tank with this end, and described exit window is located at the side of this described anode cap over against plate target;
Described cathode assembly comprises cathode shield, hold-down screw, core column cap, stem stem, negative electrode closure, first dead ring, negative electrode holder, carbon nanometer negative electrode, shading ring, second dead ring and grid; Described stem stem, first dead ring and negative electrode holder are for to be fixed together by core column cap and stem stem wire bonds; Carbon nanometer negative electrode is positioned in the negative electrode holder, and is connected with described stem stem lead-in wire; Described shading ring, second dead ring, grid are for assembling with carbon nanometer negative electrode in regular turn; Described cathode shield is located at outside described negative electrode closure, stem stem, first dead ring, negative electrode holder, core column cap, carbon nanometer negative electrode, shading ring, second dead ring and the grid, fixes by hold-down screw and described stem stem; Described negative electrode closure one end and stem stem join, and the other end then is connected in vacuum tank.
2. according to the described grid-control nanocarbon cathode field emission X-ray pipe of claim 1, it is characterized in that described control grid and carbon nanometer cathode spacing are 0.1～2mm.
3. according to the described grid-control nanocarbon cathode field emission X-ray pipe of claim 1, it is characterized in that described grid is an aperture plate.
4. according to the described grid-control nanocarbon cathode field emission X-ray pipe of claim 1, it is characterized in that described grid is the fenestra plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920106848U CN201378580Y (en) | 2009-03-26 | 2009-03-26 | Gate-controlled carbon nano-cathode field emission X-ray tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920106848U CN201378580Y (en) | 2009-03-26 | 2009-03-26 | Gate-controlled carbon nano-cathode field emission X-ray tube |
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| CN201378580Y true CN201378580Y (en) | 2010-01-06 |
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| CN200920106848U Expired - Fee Related CN201378580Y (en) | 2009-03-26 | 2009-03-26 | Gate-controlled carbon nano-cathode field emission X-ray tube |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521135B (en) * | 2009-03-26 | 2011-04-13 | 公安部第一研究所 | Grid-control nanocarbon cathode field emission X-ray pipe |
| CN105118761A (en) * | 2015-09-16 | 2015-12-02 | 成都凯赛尔电子有限公司 | Secondary electron bombardment shielding method for X-ray tubes |
| CN105261542A (en) * | 2014-07-09 | 2016-01-20 | 株式会社东芝 | Stationary anode type X-ray tube |
| CN105513929A (en) * | 2016-01-18 | 2016-04-20 | 黄石上方检测设备有限公司 | Carbon nano cold cathode X-ray tube |
| CN105575746A (en) * | 2016-01-14 | 2016-05-11 | 黄石上方检测设备有限公司 | Environment-friendly carbon nanometer cold cathode X-ray tube |
| CN105575744A (en) * | 2016-01-14 | 2016-05-11 | 黄石上方检测设备有限公司 | Preparation method of carbon nanometer cold cathode X-ray tube |
-
2009
- 2009-03-26 CN CN200920106848U patent/CN201378580Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521135B (en) * | 2009-03-26 | 2011-04-13 | 公安部第一研究所 | Grid-control nanocarbon cathode field emission X-ray pipe |
| CN105261542A (en) * | 2014-07-09 | 2016-01-20 | 株式会社东芝 | Stationary anode type X-ray tube |
| CN105261542B (en) * | 2014-07-09 | 2017-06-23 | 东芝电子管器件株式会社 | fixed anode type X-ray tube |
| CN105118761A (en) * | 2015-09-16 | 2015-12-02 | 成都凯赛尔电子有限公司 | Secondary electron bombardment shielding method for X-ray tubes |
| CN105575746A (en) * | 2016-01-14 | 2016-05-11 | 黄石上方检测设备有限公司 | Environment-friendly carbon nanometer cold cathode X-ray tube |
| CN105575744A (en) * | 2016-01-14 | 2016-05-11 | 黄石上方检测设备有限公司 | Preparation method of carbon nanometer cold cathode X-ray tube |
| CN105575744B (en) * | 2016-01-14 | 2017-08-11 | 黄石上方检测设备有限公司 | A kind of preparation method of carbon nanometer cold cathode X-ray tube |
| CN105513929A (en) * | 2016-01-18 | 2016-04-20 | 黄石上方检测设备有限公司 | Carbon nano cold cathode X-ray tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100106 Termination date: 20140326 |