CN109216139A - Shell and multifocal X-ray tube for multifocal X-ray tube - Google Patents

Abstract

The invention discloses a kind of shell for multifocal X-ray tube and the multifocal X-ray tube including the shell.Multiple Windows are equipped in the shell for multifocal X-ray tube, the multiple Windows are respectively aligned to multiple target spots on anode, forms are provided on each Windows, the forms are arranged to be sealed the shell and the intracorporal a branch of corresponding X-ray of the shell is allowed to draw the shell by the forms.At least one window in the Windows has the truncated cone being gradually expanded from inside to outside at least part of thickness of shell direction upper section.The corresponding target spot of each Windows, and there is certain collimation, moulding effect to the X-ray that the target spot generates, while being connected with ray tube shell but also with enough intensity and by close connection type, realize the high vacuum state inside ray tube.

Description

Shell and multifocal X-ray tube for multifocal X-ray tube

Technical field

The embodiment of the present invention is related to a kind of shell of X-ray tube, more particularly, it relates to which a kind of be used for multifocal X-ray tube Shell and multifocal X-ray tube including the shell.

Background technique

X-ray has a wide range of applications in fields such as industrial nondestructive testing, safety inspection, medical diagnosis and treatments.Generate X The device of ray is known as x-ray source, usually by structures such as the auxiliary devices such as X-ray tube, power supply and control system, cooling and shielding At.X-ray tube includes three cathode, anode and shell major parts.Cathode generates electronic beam current, and electronic beam current is by cathode and sun High voltage electric field between pole accelerates, and hits target spot on anode, to generate X-ray.

X-ray needs to draw from some position on shell, and the position is usually known as Windows.X-ray has very Strong penetration capacity can almost penetrate the various substances of nature, but its penetration capacity is related except energy with itself Outside, also related to the mass thickness of its penetrating material, i.e. the smaller object of mass thickness is smaller to the blocking of X-ray.In order to X-ray is preferably drawn, usually farthest reduces the thickness of Windows, but X-ray tube is the height of a sealing Vacuum cavity will bear at least one atmospheric pressure at Windows, so Windows to be usually designed to the circle of very little Or it is rectangular.

Summary of the invention

The embodiment of the present invention technical problem to be solved is, provides a kind of shell and including the multifocal of this shell The Multi-Beam X-Ray generated by multiple target spots (focus) on multiple cathodes, anode can be drawn shell by point X-ray tube.

Embodiment according to an aspect of the present invention provides a kind of shell for multifocal X-ray tube, on shell Equipped with multiple Windows, the multiple Windows are respectively aligned to the intracorporal Multi-Beam X-Ray of shell.In each Windows On be provided with forms, the forms are arranged to be sealed the shell and allow corresponding beam of x-rays in the shell The shell is drawn by the forms, section of at least one of the described Windows on thickness of shell direction is at least A part has the truncated cone being gradually expanded from inside to outside.

Shell according to an embodiment of the invention for multifocal X-ray tube, the truncated cone are penetrated with corresponding X The sector crosssection of line is substantially consistent.

Shell according to an embodiment of the invention for multifocal X-ray tube, the thickness and shell of the forms The ratio between thickness be less than 1:5, it is preferable that be less than 1:10.

Shell according to an embodiment of the invention for multifocal X-ray tube, the thickness of the forms are less than 1mm, it is preferable that be 0.02mm~0.5mm.

Shell according to an embodiment of the invention for multifocal X-ray tube, the extraction window oral area of forms covering The area divided is less than 1 square centimeter.

Shell according to an embodiment of the invention for multifocal X-ray tube, in the Windows at least One section has square or round, and the forms preferably have shape identical with Windows.

Shell according to an embodiment of the invention for multifocal X-ray tube, the forms are arranged in extraction window Mouthful inside, between outside or inner side and outer side.

Shell according to an embodiment of the invention for multifocal X-ray tube, the forms and the shell by Different materials are made, and the forms are fixed to shell by the way of welding, sintering or crimping.

Shell according to an embodiment of the invention for multifocal X-ray tube, the forms pass through connection component It is fixed to shell, the connection component includes: the pressing plate of annular, is configured to the periphery of the forms being pressed together on the shell On body；Fastener passes through the pressing plate in the periphery of the forms, and the pressing plate is fixed on the housing；And it sets Set the sealing ring between the shell and the periphery of the forms.

Shell according to an embodiment of the invention for multifocal X-ray tube, forms in the Windows Stage portion towards hull outside, the periphery of the forms are fixed in the stage portion.

Shell according to an embodiment of the invention for multifocal X-ray tube, forms have on its periphery towards shell Extend outside body and with the consistent skirt section of the taper of Windows, the skirt section is fixed to the tapered sidewalls of Windows.

Shell according to an embodiment of the invention for multifocal X-ray tube, the shell by metal, ceramics or Person's glass is made, and the forms are by a kind of metal foil system of the group formed selected from titanium foil, copper foil, aluminium foil, beryllium foil, stainless steel foil It is made at or by potsherd, sheet glass or quartz plate.

Shell according to an embodiment of the invention for multifocal X-ray tube, the forms and the shell by Identical material is made into integration.

The multifocal X-ray tube of embodiment according to another aspect of the present invention, comprising: according to any of the above-described embodiment institute The shell stated；Cathode, the cathode are located in shell and are configured to draw electronic beam current respectively from multiple positions；And sun Pole, the anode are located in shell and are configured to be aligned with cathode to generate Multi-Beam X-Ray from multiple target spots.

The shell and multifocal X-ray tube of above-mentioned working Examples according to the present invention are equipped with multiple extractions on shell Multiple target spots of window, the multiple Windows and anode in shell are respectively aligned to, and realize Windows structural thickness ratio Shell is substantially reduced, and is conducive to the extraction of X-ray, and the corresponding target spot of each Windows, the X-ray generated to the target spot With certain collimation, moulding effect, while but also with enough intensity and passing through close connection type and ray tube shell It is connected, realizes the high vacuum state inside ray tube.

Detailed description of the invention

These and or other aspects and advantage of the invention will become from description of preferred embodiments with reference to the accompanying drawing It obtains obviously and is readily appreciated that, in which:

Fig. 1 is a kind of stereoscopic schematic diagram of the multifocal X-ray tube of exemplary embodiment according to the present invention；

Fig. 2 is the operation principle schematic diagram of multifocal X-ray tube transmitting X-ray shown in FIG. 1；

Fig. 3 is the stereoscopic schematic diagram of multifocal X-ray tube transmitting X-ray shown in FIG. 1, and wherein shell, which illustrates only, is equipped with The side wall of multiple Windows；

Fig. 4 is the schematic cross-section on thickness of shell direction of a side wall of the shell in Fig. 3；

Fig. 5 A-5C is the schematic cross-section for showing the different location that shell is arranged in forms, and wherein Fig. 5 A shows forms and sets It sets in the inside of shell, Fig. 5 B shows forms and is arranged between the inner side and outer side of shell, and Fig. 5 C shows forms and is arranged in shell Outside；

Fig. 6 A-6D is to show the floor map with Windows of different shapes；

Fig. 7 is to show the inside that forms are arranged in using welding manner Windows according to an embodiment of the present Schematic cross-section；

Fig. 8 is to show another embodiment according to the present invention forms are arranged in Windows using welding manner Schematic cross-section between side and outside；

Fig. 9 is to show another embodiment according to the present invention the outer of Windows is arranged in forms using welding manner The schematic cross-section of side；

Figure 10 A is the plane signal of the forms of another exemplary embodiment according to the present invention and the connection type of shell Figure；

Figure 10 B is the schematic cross-section of Figure 10 A；

Figure 11 A is the plane signal of the forms of another exemplary embodiment according to the present invention and the connection type of shell Figure；And

Figure 11 B is the schematic cross-section of Figure 11 A.

Appended drawing reference:

1: shell；

2: cathode；

3: anode；

4,4 ', 41,42,43,44,45: Windows；

5: forms；

6: welding position；

6 ': welding filler metal；

7: sealing ring；

8: pressing plate；

9: fastener；

10: stage portion；

11: skirt section；

12: external power interface；

21,22,23,24,25: cathode site；

31,32,33,34,35: target spot；

E: electronic beam current.

Specific embodiment

Throughout the specification, similar appended drawing reference indicates similar part.

Below will be by embodiment, and in conjunction with attached drawing, the technical solutions of the present invention will be further described.It is saying In bright book, the same or similar drawing reference numeral indicates the same or similar component.Following reference attached drawings are to embodiment of the present invention Explanation be intended to explain present general inventive concept of the invention, and be not construed as to a kind of limitation of the invention.

In addition, in the following detailed description, to elaborate many concrete details to provide to present disclosure convenient for explaining The comprehensive understanding of embodiment.It should be apparent, however, that one or more embodiments without these specific details can also be with It is carried out.In other cases, well known construction and device is diagrammatically embodied to simplify attached drawing.

Inventive concept generally according to the present invention provides a kind of shell for multifocal X-ray tube, wherein in shell Body is equipped with multiple Windows, and the multiple Windows are respectively aligned to the intracorporal Multi-Beam X-Ray of shell.In each extraction Forms are provided on window, the forms are arranged to be sealed the shell and allow the shell intracorporal a branch of corresponding X-ray draws the shell by the forms.

Fig. 1 is a kind of stereoscopic schematic diagram of the multifocal X-ray tube of exemplary embodiment according to the present invention；Fig. 2 is Fig. 1 Shown in multifocal X-ray tube transmitting X-ray operation principle schematic diagram；Fig. 3 is multifocal X-ray tube transmitting X shown in FIG. 1 The stereoscopic schematic diagram of ray, wherein shell illustrates only a side wall equipped with multiple Windows；Fig. 4 is the shell in Fig. 3 A side wall the schematic cross-section on thickness of shell direction.

As shown in Figs 1-4, multifocal X-ray tube according to an embodiment of the present includes: shell 1, cathode 2 and sun Pole 3.High vacuum is formed in shell 1.Anode 3 is located in shell and is configured to be aligned with cathode with from multiple targets on anode Point generates Multi-Beam X-Ray.Specifically, the electronic beam current drawn is accelerated by the high voltage electric field between cathode and anode, and It obtains energy impact anode target spot (or focus), to generate X-ray X.Peripheral control unit by external power interface 12 with Cathode 2 and anode 3 are electrically connected, to control cathode 2 and anode 3.

The shell 1 for multifocal X-ray tube according to an embodiment of the present is equipped with multiple Windows 4, The multiple Windows are respectively aligned to multiple target spots on anode.Target spot arrangement in the arrangement and anode of Windows 4 It corresponds.For example, being equipped at least two Windows on shell 1, more preferably, it is equipped at least five Windows.Accordingly Ground is equipped at least five target spot on anode 3.As shown in Figure 3, it is schematically shown that 5 Windows are equipped on shell 1, Correspondingly, 5 target spots are equipped on anode.It will be appreciated by persons skilled in the art that Windows shown in Fig. 3 and The quantity of forms is merely exemplary, and the present invention does not limit the quantity of Windows and forms.It is shown in Fig. 3 multifocal 5 Windows of point X-ray tube are respectively aligned to 5 target spots.Cathode 2 can be from multiple cathode sites 21,22,23,24,25 Multibeam electron line E is generated, the electronic beam current E that each position generates is accelerated by the high voltage electric field between cathode 2 and anode 3, It obtains energy and hits anode 3, the different location on anode 3, i.e. target spot 31,32,33,34,35 emit X-ray.On shell 1 Different target spots are corresponding from anode 3 is provided with multiple Windows 41,42,43,44,45.That is, each Windows It is all disposed on corresponding x-ray transmission path.The X-ray that target spot 31 generates is drawn from Windows 41；The X that target spot 32 generates Ray is drawn from Windows 42；The X-ray that target spot 33 generates is drawn from Windows 43；The X-ray that target spot 34 generates is from drawing Window 44 is drawn out；The X-ray that target spot 35 generates is drawn from Windows 45.The arrangement of Windows 41,42,43,44,45 with The arrangement of target spot 31,32,33,34,35 is identical.In this way, can be respectively by corresponding Windows from the X-ray that multiple target spots generate It draws.

Forms 5 are provided on each Windows 4, the forms are arranged to that the shell 1 is sealed and is permitted Perhaps the X-ray in the described shell 1 is drawn by the forms 5.It is appreciated that other non-window positions of Windows and shell 1 It sets and compares, there is relatively much smaller thickness, but not completely open, because X-ray tube needs to form vacuum sealing.In this way, Forms 5 and shell 1 form vacuum seal structure, are in cathode 2 and anode 3 under high vacuum environment, produce cathode 2 Raw electronic beam current E can smoothly reach anode 3, without losing because of colliding with air molecule；Another aspect vacuum Insulation characterisitic make anode 3 may be at the high-voltage state of opposing cathode 2, without generating breakdown sparking easily.Anode 3 On the X-ray that generates of multiple target positions pass through different Windows 4 respectively and drawn through the forms that are disposed thereon To the hull outside of X-ray tube, for applications such as radioscopy imagings.

Fig. 5 A-5C is the schematic cross-section that shell different location is arranged in forms, and wherein Fig. 5 A shows forms and is arranged in shell The inside of body, Fig. 5 B show forms and are arranged between the inner side and outer side of shell, and Fig. 5 C shows the outside that shell is arranged in forms.

In one embodiment, as shown in Fig. 5 A-5C, 6C, 6D, at least one window in Windows 4 is in shell thickness Section at least part on degree direction has the truncated cone being gradually expanded from inside to outside.That is, Windows shown in Fig. 1 Each of 4 case inside size be less than hull outside size.Further, the truncated cone and corresponding X The sector crosssection of ray is substantially consistent.Specifically, X-ray is from the corresponding target spot on anode 3, spatially divergent shape is launched outward, The cone angle vertex that the cross sectional shape of Windows 4 is designed as truncated cone is located at anode 3, is conducive to X-ray in this way and draws shell 1, while keeping shell 1 that there is stronger intensity at the position of Windows.

In one embodiment, as shown in Fig. 4,6A, 6B, at least one of described Windows 4 are in thickness of shell side Upward section is rectangle.That is, Windows 4 do not have taper.Such design keeps window structure simple, easy to process quick.

In one embodiment, as shown in figure 4, the thickness d of forms 5 is less than the thickness D of shell 1, so that X-ray is with larger Transmissivity pass through forms 5.For example, the ratio between the thickness and the thickness of shell of the forms are less than 1:5, it is preferable that be less than 1:10. In a kind of exemplary embodiment, forms 5 are disposed at Windows 4, the thickness of forms 5 is very thin, arrives in a few tenths of a mm In the thickness range of millimeter magnitude.For example, the thickness of the forms is less than 1mm, it is preferable that be 0.02mm~0.5mm.In this way, Forms 5 are much smaller than the other positions of shell 1 to the blocking of X-ray, so as to draw X-ray to greatest extent.

In one embodiment, the area of forms 5 and 4 corresponding part of Windows is less than 1 square centimeter.Generally, often One Windows, 4 correspondences, one target spot, so Windows 4 have lesser area, the pressure that Windows 4 itself are born Power very little, the thickness d of forms 5 can be designed very little, and Windows can have a small amount of change under the action of atmospheric pressure Shape will not still rupture.

Fig. 6 A-6D is to show the floor map with Windows 4 of different shapes.In one embodiment, described The section of at least one of Windows is square or circle.Fig. 6 A and 6C show the embodiment of round Windows, Wherein the Windows in Fig. 6 A do not have taper, and the Windows in Fig. 6 C have certain taper.Fig. 6 B and 6D show pros The embodiment of shape Windows, wherein the Windows in Fig. 6 B do not have taper, and the Windows in Fig. 6 D have certain taper. Forms have shape identical with Windows 4.The i.e. described forms and Windows all have round or regular polygon, but window The area of body is greater than the area of Windows, to cover Windows.It will be appreciated by persons skilled in the art that the forms Also it can have the shape different from Windows.Multiple Windows on a ray tube, can be same shape, It is also possible to several combinations of different shapes.

Fig. 7 is to show the inside that forms are arranged in using welding manner Windows according to an embodiment of the present Schematic cross-section；Fig. 8 is to show another embodiment according to the present invention forms are arranged in extraction window using welding manner Schematic cross-section between the inner side and outer side of mouth；Fig. 9 is to show another embodiment according to the present invention using welding manner Forms are arranged in the schematic cross-section in the outside of Windows.

In one embodiment, forms 5 are by being welded and fixed to the insides of Windows 4, as shown in Figure 7.At this point, forms It can be covered on Windows on the inside of shell.In another embodiment, forms 5 are by being welded and fixed to Windows Between 4 inner side and outer side, as shown in Figure 8.At this point, skirt section 11 has can be set in forms periphery, then it is fixed to by skirt section The side wall of Windows.About the skirt section in Fig. 8, will be described in more detail below.In another embodiment, forms 5 pass through weldering The outside for being fixed to Windows 4 is connect, as shown in Figure 9.At this point, forms can be from the outer side covering of shell on Windows. It should be noted that forms are not defined relative to the fixation position of Windows, but it can according to need and flexibly set It sets.Moreover, forms may be the same or different relative to the fixation position of Windows in same X-ray tube.

Figure 10 A is the plane signal of the forms of another exemplary embodiment according to the present invention and the connection type of shell Figure；Figure 10 B is the schematic cross-section of Figure 10 A.Figure 11 A is the forms and shell of another exemplary embodiment according to the present invention Connection type floor map；Figure 11 B is the schematic cross-section of Figure 11 A.

As shown in Fig. 5 A-5C, 10A-10B, 11A-11B, the inside, outside or inside of Windows 4 is arranged in forms 5 Between outside.Forms 5 and shell 1 are made from a variety of materials.Further, forms 5 are using welding, sintering or the side crimped Formula is fixed to shell 1.For example, shell 1 is made of metal, ceramics or glass, forms 5 by selected from titanium foil, copper foil, aluminium foil, Beryllium foil, stainless steel foil composition a kind of metal foil of group be made, and forms 5 are using by the way of welding or the mode of crimping It is fixed on shell 1 and forms vacuum seal structure.Since the thickness of metal foil is uniform, the tool of the forms made of metal foil There are very big convenience and cost advantage.

In a kind of alternate embodiment, shell 1 is made of metal, ceramics or glass, and forms 5 are by for example ceramic The nonmetallic sheeting of piece, sheet glass, quartz plate etc is made, and forms 5 are fixed by the way of welding or sintering Vacuum seal structure is formed to Windows 4, and with shell 1.

In a kind of exemplary embodiment, as Figure 7-9, forms 5 are individually secured to by extraction window using welding manner Between mouthfuls 4 inside, outside and inside, outside.The forms 5 made of metal foil can completely enclose Windows 4 and with Shell forms sealing.Welding position 6 surrounds Windows 4 complete one weeks, so that the welded connecting between forms 5 and shell 1 (fusion) is a circle an of complete closure, so that forms 5 and shell 1 form vacuum-packed connection relationship.Welding side Formula includes, but are not limited to argon arc welding, electric resistance welding, Laser Welding, soldering, electron beam welding, friction welding (FW), diffusion welding (DW), explosion weldering etc..

In a kind of exemplary embodiment, as shown in Figure 10 A-10B, forms 5 are fixed to shell 1 by connection component, The connection component includes: the pressing plate 8 of annular, is configured to for being pressed together on shell 1 on the periphery of forms 5；And fastener 9, Pressing plate 8 is passed through in the periphery of forms 5, pressing plate 8 is fixed on shell 1.Forms 5 have biggish face with respect to Windows 4 Product, can cover all Windows 4.Further, connection component further include be arranged in shell 1 and forms 5 periphery it Between sealing ring 7.Sealing ring 7 has the sealing characteristics of high vacuum, and is a complete circle.Sealing ring 7 is placed on the ring of shell 1 Between Windows 4 and the periphery of forms 5.Pressing plate 8 has multiple apertures in position corresponding with Windows 4, and pressing plate 8 is pressed Sealing ring 7 can be uniformly squeezed on forms 5, and through forms 5.Fastener 9 connects pressing plate 8 and shell 1, passes through fastening effect So that sealing ring 7 is squeezed deformation, forms 5 is finally made to realize that vacuum sealing is connect with shell 1.Fastener 9 is for example including spiral shell Nail or rivet.Using this fastening means, forms 5 can be securely fixed on shell 1.

In a kind of exemplary embodiment, as shown in Figure 11 A-11B, formed in Windows 4 ' outside towards shell 1 Stage portion 10, the periphery of forms 5 is fixed in stage portion 10.The part that Windows 4 ' are located at 5 inside of forms has outside The truncated cone shape gradually increased, the part that Windows are located at 5 outside of forms also have the truncated cone shape gradually increased outward.Extraction window Mouth 4 ' is preferably the different piece of the same taper in the tapers of 5 inside of forms and the taper in 5 outside of forms.Shell 1 The stage portion 10 complete one that stage portion 10 in Windows 4 ' is arranged about Windows 4 ' is enclosed.It is placed in stage portion 10 There is welding filler metal 6 ', solder 6 ' is arranged to a complete circle also along stage portion 10.The excircle of forms 5 is less than Windows 4 ' Stage portion 10 excircle, forms 5 are placed on welding filler metal 6 '.Shell 1, welding filler metal 6 ' go out beam forms 5 according to described Positional relationship from inside to outside is integrally placed into high temperature brazing furnace, and high temperature melts welding filler metal 6 ', weldering when temperature lowers It connects solder 6 ' 5 vacuum sealing of forms is fixed on shell 1.

In one embodiment, as shown in figure 8, forms 5 have on its periphery towards extension outside shell 1 and and Windows The consistent skirt section 11 of taper, the skirt section is fixed to the tapered sidewalls of Windows.In such manner, it is possible to make forms 5 and shell 1 It fits closely, Windows is sealed to form vacuum structure.

In another embodiment, forms 5 and shell 1 are made into integration by identical material.As shown in figure 4, forms 5 are logical It crosses and is removing a part of material with a thickness of processing on D shell 1 and manufactured, and then form Windows 4.In this way, remaining thickness Degree is the forms 5 that d very small part material is used as Windows 4, and forms 5 are a part of shell 1.That is, forms 5 with Shell 1 is formed as an entirety, have extraordinary vacuum leakproofness, and be easy by forms 4 be formed in shell 1 inside or Position (as indicated by figures 5 a-5b) between person inner side and outer side.

Embodiment according to a further aspect of the invention, as shown in Figure 1-3, a kind of multifocal X-ray tube is provided, it is described multifocal Point X-ray tube includes shell described in above-mentioned working Examples；Cathode 2, the cathode 2 are located in shell 1 and are configured to Electronic beam current E is drawn respectively from multiple positions；And anode 3, the anode 3 are located in shell 1 and are configured to and cathode 2 Alignment is to generate Multi-Beam X-Ray X from multiple target spots.

Although being in an embodiment of the present invention to be illustrated the shape of Windows and forms with square, circle, Be that the present invention is not limited thereto, but can change according to specific needs one in multifocal X-ray tube, it is multiple or all The shape of Windows and forms, such as rectangle.

The shell and multifocal X-ray tube of above-mentioned working Examples according to the present invention are equipped with multiple extractions on shell Multiple target spots of window, the multiple Windows and anode in shell are respectively aligned to, and realize Windows structural thickness ratio Shell is substantially reduced, and is conducive to the extraction of X-ray, while but also with enough intensity and passing through close connection type and ray Tube shell is connected, and realizes the high vacuum state inside ray tube.

Although for the purpose illustrated according to being presently considered to be most realistic and preferred embodiment to this hair It is bright to be described in detail.It will be understood to those skilled in the art that embodiment described above is all exemplary, and Those skilled in the art can make improvements, and structure described in various embodiments is in not recurring structure or principle It can be freely combined in the case where the conflict of aspect, to be realized more on the basis of solving technical problem of the invention A variety of shells and multifocal X-ray tube.

After the preferred embodiment that the present invention will be described in detail, those skilled in the art can be apparent from, It does not depart from the protection scope of appended claims and spirit is lower can carry out various change and change, and the present invention is also not only restricted to The embodiment of examples cited embodiment in bright book.

Claims (12)

1. a kind of shell for multifocal X-ray tube, wherein

Multiple Windows are equipped on shell, the multiple Windows are respectively aligned to the intracorporal Multi-Beam X-Ray of shell,

Forms are provided on each Windows, the forms are arranged to be sealed the shell and allow the shell Intracorporal a branch of corresponding X-ray draws the shell by the forms,

At least part in section of at least one window on thickness of shell direction in the Windows have from it is interior to The truncated cone being gradually expanded outside.

2. the shell according to claim 1 for multifocal X-ray tube, wherein

The truncated cone is substantially consistent with the sector crosssection of corresponding X-ray.

3. the shell of multifocal X-ray tube is used for described in any one of -2 according to claim 1, wherein

The ratio between thickness and the thickness of shell of the forms are less than 1:5, it is preferable that are less than 1:10.

4. the shell of multifocal X-ray tube is used for described in any one of -3 according to claim 1, wherein

The thickness of the forms is less than 1mm, it is preferable that is 0.02mm~0.5mm.

5. the shell of multifocal X-ray tube is used for described in any one of -4 according to claim 1, wherein

Forms cover the area of Windows part less than 1 square centimeter.

6. according to claim 1 described in any one of -5 be used for multifocal X-ray tube shell, wherein the forms and The shell is made from a variety of materials,

The forms are fixed to shell by the way of welding, sintering or crimping.

7. the shell according to claim 6 for multifocal X-ray tube, wherein

The forms are fixed to shell by connection component, and the connection component includes:

The pressing plate of annular is configured to the periphery pressing of the forms on the housing；

Fastener passes through the pressing plate in the periphery of the forms, and the pressing plate is fixed on the housing；And

Sealing ring between the shell and the periphery of the forms is set.

8. the shell of multifocal X-ray tube is used for described in any one of -6 according to claim 1, wherein

The stage portion towards hull outside is formed in the Windows, the periphery of the forms is fixed on the stage portion On.

9. the shell of multifocal X-ray tube is used for described in any one of -6 according to claim 1, wherein

Forms its periphery have towards hull outside extend and with the consistent skirt section of the taper of Windows, the skirt section is fixed To the tapered sidewalls of Windows.

10. being used for the shell of multifocal X-ray tube according to any one of claim 6-9, wherein

The shell is made of metal, ceramics or glass, and the forms are by being selected from titanium foil, copper foil, aluminium foil, beryllium foil, stainless steel A kind of metal foil of the group of foil composition is made or is made of potsherd, sheet glass or quartz plate.

11. the shell of multifocal X-ray tube is used for described in any one of -5 according to claim 1, wherein

The forms and the shell are made into integration by identical material.

12. a kind of multifocal X-ray tube, comprising:

Shell described in any one of -11 according to claim 1；

Cathode, the cathode are located in shell and are configured to draw electronic beam current respectively from multiple positions；And

Anode, the anode are located in shell and are configured to be aligned with cathode to generate Multi-Beam X-Ray from multiple target spots.