CN212032985U - Cathode optical structure of miniature micro-focal spot X-ray tube - Google Patents
Cathode optical structure of miniature micro-focal spot X-ray tube Download PDFInfo
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- CN212032985U CN212032985U CN202020261437.1U CN202020261437U CN212032985U CN 212032985 U CN212032985 U CN 212032985U CN 202020261437 U CN202020261437 U CN 202020261437U CN 212032985 U CN212032985 U CN 212032985U
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- 230000003287 optical effect Effects 0.000 title claims description 11
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 17
- 239000010937 tungsten Substances 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000005684 electric field Effects 0.000 description 2
- 230000005461 Bremsstrahlung Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a miniature little focal spot X-ray tube's cathode optics structure, including one-level electron focus structure, the insulating fixed cover of top fixedly connected with of one-level electron focus structure, the bottom fixedly connected with second grade electron focus structure of one-level electron focus structure, the first electrode column of top one side fixedly connected with of insulating fixed cover, the top opposite side fixedly connected with second electrode column of insulating fixed cover, fixedly connected with tungsten filament between the bottom of first electrode column and the bottom of second electrode column, the tungsten filament transmission has the electron flow, the all sides fixedly connected with anode sleeve of bottom side of second grade electron focus structure, anode sleeve's bottom center department fixedly connected with X ray anode mark target. The utility model discloses a set up the spiral silk and replace linear silk, can gain littleer cathode ray for the focused focal spot is littleer.
Description
Technical Field
The utility model relates to a cathode optics structure field especially relates to a miniature little focal spot X-ray tube's cathode optics structure.
Background
A common miniature X-ray tube structure mainly comprises an electron cathode and an anode target, and additionally requires a high voltage electric field to be applied between the electron cathode and the anode target. The electron cathode emits electrons, bombards the anode target under the acceleration of a high-voltage electric field, and generates X rays through bremsstrahlung. Because of the influence of volume constraint and technical complexity, a common miniature X-ray tube generally has no electrostatic focusing structure and no magnetic focusing structure, so that the size of an X-ray focal spot is generally larger and basically more than millimeter, and the application requirement of high-resolution nondestructive detection cannot be met.
Disclosure of Invention
The utility model aims at solving the defects existing in the prior art, and provides a cathode optical structure of a miniature micro-focal spot X-ray tube.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a miniature little focal spot X-ray tube's cathode optical structure, includes one-level electron focus structure which characterized in that: the top end of the primary electronic focusing structure is fixedly connected with an insulating fixed cover, the bottom end of the primary electronic focusing structure is fixedly connected with a secondary electronic focusing structure, one side of the top end of the insulating fixed cover is fixedly connected with a first electrode column, the other side of the top end of the insulating fixed cover is fixedly connected with a second electrode column, a tungsten filament is fixedly connected between the bottom end of the first electrode column and the bottom end of the second electrode column, the tungsten filament emits electron current, the bottom periphery of the secondary electronic focusing structure is fixedly connected with an anode sleeve, the bottom center of the anode sleeve is fixedly connected with an X-ray anode target, the second electrode column is provided with a sealing ring at the joint with the insulating fixed cover, the first electrode column is provided with a sealing ring at the joint with the insulating fixed cover, the insulating fixed cover is provided with a fixed hole at the joint with the first electrode column, the insulating fixed cover is provided with the fixed orifices in the junction with the second electrode post, the tungsten filament is the heliciform, the tungsten filament is located the positive center department of one-level electron focus structure, the shape of one-level electron focus structure is glossy toper, one-level electron focus structure throat down and with second grade electron focus structural connection, the shape of second grade electron focus structure is the smooth toper of throat down.
The utility model discloses an X-ray focusing structure, including second grade electron focusing structure, the outer lane week of second grade electron focusing structure is provided with the breach in the junction with the positive pole sheathed tube, positive pole sheathed tube bottom is provided with the positive pole subassembly, X-ray anode target is located the center department of positive pole subassembly.
As a further description of the above technical solution:
the top end of the first electrode column is provided with an electrical connection hole, and the top end of the second electrode column is provided with an electrical connection hole.
The utility model discloses following beneficial effect has:
1. the utility model discloses a set up the spiral silk and replace linear silk, can gain littleer cathode ray for the focused focal spot is littleer.
2. The utility model discloses a set up one-level electron focus structure and second grade electron focus structure, two structures are simultaneously, and electron flow is tied into one and thin electron beam, guarantees that the focal spot size is enough little, and resolution ratio is high.
Drawings
Fig. 1 is a cross-sectional view of the overall structure of the cathode optical structure of a micro-focal spot X-ray tube according to the present invention;
fig. 2 is a cross-sectional view of a cathode structure of a cathode optical structure of a micro-focal spot X-ray tube according to the present invention;
fig. 3 is a schematic diagram of a cathode structure of a cathode optical structure of a micro-focal spot X-ray tube according to the present invention.
Illustration of the drawings:
1. a primary electron focusing structure; 2. an anode bushing; 3. a first electrode column; 4. a second electrode column; 5. a tungsten filament; 6. a secondary electron focusing structure; 7. a stream of electrons; 8. an X-ray anode target; 9. and an insulating fixing cover.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-3, the present invention provides an embodiment: a cathode optical structure of a micro-focal spot X-ray tube comprises a primary electron focusing structure 1, an electron current 7 is deflected, an insulating fixing cover 9 is fixedly connected to the top end of the primary electron focusing structure 1, the current is prevented from being too small than a tungsten filament 5, a secondary electron focusing structure 6 is fixedly connected to the bottom end of the primary electron focusing structure 1, the electron current 7 is deflected for the second time to complete focusing, a first electrode column 3 is fixedly connected to one side of the top end of the insulating fixing cover 9, a second electrode column 4 is fixedly connected to the other side of the top end of the insulating fixing cover 9 and is connected with a high-voltage power supply, the tungsten filament 5 is fixedly connected between the bottom end of the first electrode column 3 and the bottom end of the second electrode column 4 and is used for emitting the electron current 7, the tungsten filament 5 emits the electron current 7, the electron current 7 bombards an anode metal target to generate X-rays, an anode sleeve, the center of the bottom end of the anode sleeve 2 is fixedly connected with an X-ray anode target 8. The second electrode column 4 is provided with the sealing ring in the junction with insulating fixed cover 9, and first electrode column 3 is provided with the sealing ring in the junction with insulating fixed cover 9, guarantees that inside is in vacuum environment, avoids leaking into the air, and insulating fixed cover 9 is provided with the fixed orifices in the junction with first electrode column 3, and insulating fixed cover 9 is provided with the fixed orifices in the junction with second electrode column 4. The tungsten filament 5 is spiral, so as to reduce the emission width of the electron current 7, and the tungsten filament 5 is positioned at the right center of the primary electron focusing structure 1. The shape of the primary electronic focusing structure 1 is a smooth cone, so that the flowing shape of the electron current 7 is similar to that of the focusing structure, the primary electronic focusing structure 1 is downwards contracted and connected with the secondary electronic focusing structure 6, and the secondary electronic focusing structure 6 is a smooth cone downwards contracted to reduce refraction.
The periphery of the outer ring of the secondary electron focusing structure 6 is provided with a notch at the joint with the anode sleeve 2, the bottom end of the anode sleeve 2 is provided with an anode assembly, and the X-ray anode target 8 is positioned at the center of the anode assembly. The top end of the first electrode column 3 is provided with an electrical connection hole, and the top end of the second electrode column 4 is provided with an electrical connection hole for connecting with a high-voltage power supply.
The working principle is as follows: high voltage electricity is connected to the first electrode column 3 and the second electrode column 4, the tungsten filament 5 generates high temperature at the moment and emits electron current 7, the electron current 7 deflects to the center under the action of the primary electron focusing structure 1, the deflected electron current 7 passes through the secondary electron focusing structure 6, the electron current 7 is gathered to the center again at the moment to complete fine focusing, and the focused electron current 7 bombards an X-ray anode target 8 to generate X-ray
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (3)
1. Cathode optical structure of a miniature micro-focal spot X-ray tube, comprising a primary electron focusing structure (1), characterized in that: the top end of the primary electronic focusing structure (1) is fixedly connected with an insulating fixed cover (9), the bottom end of the primary electronic focusing structure (1) is fixedly connected with a secondary electronic focusing structure (6), one side of the top end of the insulating fixed cover (9) is fixedly connected with a first electrode column (3), the other side of the top end of the insulating fixed cover (9) is fixedly connected with a second electrode column (4), a tungsten filament (5) is fixedly connected between the bottom end of the first electrode column (3) and the bottom end of the second electrode column (4), the tungsten filament (5) emits an electron stream (7), the bottom end periphery of the secondary electronic focusing structure (6) is fixedly connected with an anode sleeve (2), the bottom center of the anode sleeve (2) is fixedly connected with an X-ray target anode (8), and the second electrode column (4) is provided with a sealing ring at the joint of the insulating fixed cover (9), first electrode post (3) are provided with the sealing ring in the junction with insulating fixed cover (9), insulating fixed cover (9) are provided with the fixed orifices in the junction with first electrode post (3), insulating fixed cover (9) are provided with the fixed orifices in the junction with second electrode post (4), tungsten filament (5) are the heliciform, tungsten filament (5) are located the positive center department of one-level electron focus structure (1), the shape of one-level electron focus structure (1) is smooth toper, one-level electron focus structure (1) is necking down and is connected with second grade electron focus structure (6), the shape of second grade electron focus structure (6) is the smooth toper of necking down.
2. The cathode optical structure of a micro-miniature focal spot X-ray tube according to claim 1, wherein: the utility model discloses an X-ray focusing structure, including second grade electron focusing structure (6), the outer lane week of second grade electron focusing structure (6) is provided with the breach in the junction with anode sleeve (2), the bottom of anode sleeve (2) is provided with the anode assembly, X-ray anode target (8) are located the center department of anode assembly.
3. The cathode optical structure of a micro-miniature focal spot X-ray tube according to claim 1, wherein: the top end of the first electrode column (3) is provided with an electrical connection hole, and the top end of the second electrode column (4) is provided with an electrical connection hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020261437.1U CN212032985U (en) | 2020-03-06 | 2020-03-06 | Cathode optical structure of miniature micro-focal spot X-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020261437.1U CN212032985U (en) | 2020-03-06 | 2020-03-06 | Cathode optical structure of miniature micro-focal spot X-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212032985U true CN212032985U (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020261437.1U Expired - Fee Related CN212032985U (en) | 2020-03-06 | 2020-03-06 | Cathode optical structure of miniature micro-focal spot X-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212032985U (en) |
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2020
- 2020-03-06 CN CN202020261437.1U patent/CN212032985U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 264200 No. 81 middle culture Road, Shandong, Weihai Patentee after: Zhongke photoelectric technology (Weihai) Co.,Ltd. Address before: 264200 No. 81 middle culture Road, Shandong, Weihai Patentee before: Weihai Optoelectronic Base, Xi'an Institute of Optics and Precision Mechanics of CAS |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201127 |