X-ray tube and cathode assembly
By setting two filaments of different sizes side by side in the X-ray tube cathode assembly and using multiple gates and insulated ceramic structures, zooming from large focus to micro focus is achieved, and the cathode cannot take into account both large focus in the prior art. and the microfocus size problem meet the needs of high-resolution X-ray sources.
Patent Information
- Application Number
- CN202323655147.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-31
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2033-12-31
AI Technical Summary
The existing X-ray tube cathode cannot achieve large-scale zoom, while taking into account both large focus and microfocus sizes, which cannot meet the high-resolution needs of microfocus X sources in chip flaw detection and medicine.
Design an X-ray tube cathode assembly, adopting two filament structures arranged side by side, one of which is larger than the other filament, and zooming from large to microfocus through different current adjustments, using multiple gates and insulated ceramics The structure further adjusts the focal size.
Large-range zooming from large focus to micro focus is achieved, the needs of high-resolution X-ray sources are met, and the problem that cathodes in the prior art cannot take into account both large focus and micro focus sizes.
Smart Images
Figure CN222281910U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of X-ray tubes, and in particular to an X-ray tube and a cathode assembly. Background Art
[0002] With the high-end application of X-ray detectors and imaging technology in chip flaw detection and medical fields, higher requirements are placed on the resolution of X-ray sources, and the concept of micro-focus X-ray sources has gradually formed. Usually, a micro-focus source refers to an X-ray source with a focus size of hundreds of microns or even tens of microns.
[0003] However, the existing X-ray tube cathode adopts a single filament structure, and its emission current cannot be changed in a large range. Due to the limitation of the filament emission current, it is impossible to achieve a wide range of zoom while taking into account the large focus and micro focus sizes.
[0004] With respect to the technical problem that the cathode of the X-ray tube in the above-mentioned prior art cannot achieve a wide range of zoom while taking into account both the large focus and the micro focus size, no effective solution has been proposed so far. Utility Model Content
[0005] The utility model provides an X-ray tube and cathode assembly, which at least solves the technical problem in the prior art that the X-ray tube cathode cannot achieve a wide range of zooming while taking into account the large focus and micro focus sizes.
[0006] According to one aspect of the present application, a cathode assembly for an X-ray tube is provided, comprising: a focusing electrode; a first filament and a second filament, wherein the first filament and the second filament are arranged side by side at the focusing electrode, and the size of the first filament is larger than that of the second filament.
[0007] Optionally, the length of the first filament is 13 mm.
[0008] Optionally, the length of the second filament is 9 mm.
[0009] Optionally, the cathode assembly further includes a first grid and a second grid, wherein the first grid and the second grid are arranged at two ends of the second filament opposite to each other along the length direction of the second filament.
[0010] Optionally, the cathode assembly further includes a third grid and a fourth grid, wherein the third grid and the fourth grid are arranged oppositely on both sides of the second filament along the width direction of the second filament.
[0011] Optionally, the focusing electrode is provided with a first mounting groove and a second mounting groove side by side, and wherein the first filament is mounted in the first mounting groove, and the second filament is mounted in the second mounting groove.
[0012] Optionally, the first mounting groove is provided with a first mounting hole corresponding to the first lead of the first filament and a second mounting hole corresponding to the second lead of the first filament. Also, the second mounting groove is provided with a third mounting hole corresponding to the first lead of the second filament and a fourth mounting hole corresponding to the second lead of the second filament.
[0013] Optionally, the first lead sleeve of the first filament is provided with a first insulating ceramic, the second lead sleeve of the first filament is provided with a second insulating ceramic, and the first lead sleeve of the second filament is provided with a third insulating ceramic, and the second lead sleeve of the second filament is provided with a fourth insulating ceramic.
[0014] According to another aspect of the present application, an X-ray tube is provided, comprising: the cathode assembly as described in any one of the above; and an anode target plate.
[0015] Optionally, at least a portion of a focus formed by the first filament of the cathode assembly on the anode target disk overlaps with at least a portion of a focus formed by the second filament of the cathode assembly on the anode target disk.
[0016] Therefore, in the utility model, two filaments are arranged side by side at the focusing pole of the cathode assembly. The size of the first filament is larger than that of the second filament. Therefore, a large focus can be formed by the first filament with a larger size, and a small focus can be formed by the second filament with a smaller size. Therefore, a wide range of zooming can be achieved. And by further adjusting the focus formed by the second filament, a smaller micro focus can be formed. Therefore, a wide range of zooming from a large focus to a micro focus is achieved. The technical problem that the cathode of the X-ray tube cannot achieve a wide range of zooming and take into account the size of the large focus and the micro focus in the prior art is solved.
[0017] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Hereinafter, some specific embodiments of the present application will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:
[0019] Figure 1 is a schematic diagram of the bottom surface of a cathode assembly for an X-ray tube according to the utility model; and
[0020] Figure 2 The cross-sectional side view of the cathode assembly for an X-ray tube according to the utility model DETAILED DESCRIPTION
[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0022] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0025] Figure 1 is a schematic diagram of the bottom surface of a cathode assembly 100 for an X-ray tube according to the present embodiment; Figure 2 is a cross-sectional side view of a cathode assembly 100 for an X-ray tube according to the present embodiment.
[0026] According to a first aspect of this embodiment, referring to Figure 1 and Figure 2 As shown, the utility model provides a cathode assembly 100 for an X-ray tube, comprising: a focusing electrode 110; a first filament 121 and a second filament 131. The first filament 121 and the second filament 131 are arranged side by side on the focusing electrode 110, and the size of the first filament 121 is larger than that of the second filament 131.
[0027] As described in the background technology, the existing X-ray tube cathode adopts a single filament structure, and its emission current cannot change in a large range. Due to the limitation of the filament emission current, it is impossible to achieve a large range of zoom, while taking into account the large focus and micro focus sizes. In view of this, in the utility model, two filaments 121 and 131 are arranged side by side at the focusing pole 110 of the cathode assembly 100. The size of the first filament 121 is larger than the size of the second filament 131. Thus, a large focus can be formed by the first filament 121 with a larger size, and a small focus can be formed by the second filament 131 with a smaller size. Thus, a large range of zoom can be achieved. And by further adjusting the focus formed by the second filament 131, a smaller micro focus can be formed. Thus, a large range of zoom from a large focus to a micro focus is achieved. The technical problem that the X-ray tube cathode in the prior art cannot achieve a large range of zoom, while taking into account the large focus and micro focus sizes is solved.
[0028] Optionally, the length of the first filament 121 is 13 mm. Thus, a large focus with a size of 1.97×1.80 mm can be formed by applying a current of 200 mA to the first filament 121 .
[0029] Optionally, the length of the second filament 131 is 9 mm. Thus, a current of 200 mA is applied to the second filament 131 to form a small focus with a size of 1.15×1.03 mm.
[0030] Optionally, refer to Figure 1 As shown, the cathode assembly 100 further includes a first grid 141a and a second grid 141b, wherein the first grid 141a and the second grid 141b are relatively arranged at two ends of the second filament 131 along the length direction of the second filament 131. Thus, the length of the focus formed by the second filament 131 can be adjusted by applying current to the first grid 141a and the second grid 141b.
[0031] Optionally, refer to Figure 1 As shown, the cathode assembly 100 further includes a third grid 142a and a fourth grid 142b, wherein the third grid 142a and the fourth grid 142b are relatively arranged on both sides of the second filament 131 along the width direction of the second filament 131. Thus, the width of the focus formed by the second filament 131 can be adjusted by applying current to the third grid 142a and the fourth grid 142b.
[0032] Therefore, through the first grid 141 a to the fourth grid 142 b described above, when a current of 100 mA is applied to the second filament 131 , the size of the focus formed by the second filament 131 can be adjusted to about 40×20 μm.
[0033] Optionally, refer to Figure 1 and Figure 2 The focusing electrode 110 is provided with a first mounting groove 111 and a second mounting groove 112 side by side, wherein the first filament 121 is installed in the first mounting groove 111 , and the second filament 131 is installed in the second mounting groove 112 .
[0034] Optionally, the first mounting groove 111 is provided with a first mounting hole 113a corresponding to the first lead 122a of the first filament 121 and a second mounting hole 113b corresponding to the second lead 122b of the first filament 121. Also, the second mounting groove 112 is provided with a third mounting hole 113c corresponding to the first lead 132a of the second filament 131 and a fourth mounting hole 113d corresponding to the second lead 132b of the second filament 131.
[0035] Further, the first lead 122a of the first filament 121 is sleeved with a first insulating ceramic 151a, the second lead 122b of the first filament is sleeved with a second insulating ceramic 151b, and the first lead 132a of the second filament 131 is sleeved with a third insulating ceramic 151c, and the second lead 132b of the second filament 131 is sleeved with a fourth insulating ceramic 151d.
[0036] In addition, although not shown in the figures, according to a second aspect of this embodiment, there is provided an X-ray tube, comprising: a cathode assembly as described in any one of the above; and an anode target plate.
[0037] Further, at least a portion of a focus formed by the first filament 121 of the cathode assembly 100 on the anode target disk overlaps with at least a portion of a focus formed by the second filament 131 of the cathode assembly 100 on the anode target disk.
[0038] Therefore, in the utility model, two filaments are arranged side by side at the focusing pole of the cathode assembly. The size of the first filament is larger than that of the second filament. Therefore, a large focus can be formed by the first filament with a larger size, and a small focus can be formed by the second filament with a smaller size. Therefore, a wide range of zooming can be achieved. And by further adjusting the focus formed by the second filament, a smaller micro focus can be formed. Therefore, a wide range of zooming from a large focus to a micro focus is achieved. The technical problem that the cathode of the X-ray tube cannot achieve a wide range of zooming and take into account the size of the large focus and the micro focus in the prior art is solved.
[0039] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0040] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0041] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0042] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A cathode assembly (100) for an X-ray tube, characterized in that: include: A focusing electrode (110); a first filament (121) and a second filament (131), wherein The first filament (121) and the second filament (131) are arranged side by side on the focusing electrode (110), and the size of the first filament (121) is larger than the size of the second filament (131).
2. The cathode assembly (100) according to claim 1, characterized in that: The length of the first filament (121) is 13 mm.
3. The cathode assembly (100) of the X-ray tube according to claim 1, characterized in that: The length of the second filament (131) is 9 mm.
4. The cathode assembly (100) according to claim 1 or 3, characterized in that: It also includes a first grid (141a) and a second grid (141b), wherein the first grid (141a) and the second grid (141b) are arranged relatively at two ends of the second filament (131) along the length direction of the second filament (131).
5. The cathode assembly (100) according to claim 1 or 3, characterized in that: It also includes a third grid (142a) and a fourth grid (142b), wherein the third grid (142a) and the fourth grid (142b) are arranged relatively on both sides of the second filament (131) along the width direction of the second filament (131).
6. The cathode assembly (100) according to claim 1, characterized in that: The focusing electrode (110) is provided with a first mounting groove (111) and a second mounting groove (112) in parallel, wherein the first filament (121) is mounted in the first mounting groove (111), and the second filament (131) is mounted in the second mounting groove (112).
7. The cathode assembly (100) according to claim 6, characterized in that: The first mounting groove (111) is provided with a first mounting hole (113a) corresponding to a first lead wire (122a) of the first filament (121) and a second mounting hole (113b) corresponding to a second lead wire (122b) of the first filament (121), and The second mounting groove (112) is provided with a third mounting hole (113c) corresponding to the first lead (132a) of the second filament (131) and a fourth mounting hole (113d) corresponding to the second lead (132b) of the second filament (131).
8. The cathode assembly (100) according to claim 7, characterized in that: The first lead wire (122a) of the first filament (121) is sheathed with a first insulating ceramic (151a), the second lead wire (122b) of the first filament is sheathed with a second insulating ceramic (151b), and The first lead wire (132a) of the second filament (131) is sheathed with a third insulating ceramic (151c), and the second lead wire (132b) of the second filament (131) is sheathed with a fourth insulating ceramic (151d).
9. An X-ray tube, characterized in that: include: A cathode assembly (100) as claimed in any one of claims 1 to 8; and an anode target disk.
10. The X-ray tube according to claim 9, characterized in that At least a portion of a focus formed by the first filament (121) of the cathode assembly (100) on the anode target disk overlaps with at least a portion of a focus formed by the second filament (131) of the cathode assembly (100) on the anode target disk.