A stage mechanism and transmission electron microscope frozen sample rod

Abstract

The application discloses a kind of stage mechanism and transmission electron microscope frozen sample rod, including rod head and object table, installation site for installing object table is formed on rod head, object table is correspondingly placed in installation site, and positioning silk thread for tension positioning is connected between rod head and object table, object table is configured as by positioning silk thread fixed in the installation site of rod head in suspension state.The object table of the present application is fixed in the installation site of rod head in suspension state by positioning silk thread, there is no direct contact between object table and installation site, but is fixedly connected by positioning silk thread, can effectively reduce the cooling cross-sectional area of the connecting fixed place of object table and rod head, itself temperature can be maintained more stable, reduce the cooling shrinkage amount generated by temperature change, it is favorable to improve the stability of object table.

Description

Technical Field

[0001] This invention relates to the field of transmission electron microscopy (TEM) sample holder technology, specifically to a stage mechanism and a TEM cryogenic sample holder. Background Technology

[0002] Chinese documents CN214505438U and CN216719864U both disclose a cryogenic sample holder for transmission electron microscopy. However, during the cooling process to liquid nitrogen temperature, the stage of the cryogenic sample holder for transmission electron microscopy is easily affected by the interference of thermal expansion and contraction, which causes the stage to drift easily and has poor stability. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a stage mechanism that primarily solves the technical problem that existing stages are prone to drifting in the stress position and have poor stability during the cooling process.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] A stage mechanism suitable for a cryogenic sample holder for transmission electron microscopy includes a holder head and a stage. The holder head has a mounting position for mounting the stage, and the stage is correspondingly placed in the mounting position. A positioning wire for tensioning and positioning is connected between the holder head and the stage. The stage is configured to be suspended and fixed in the mounting position of the holder head by the positioning wire.

[0006] Furthermore, the platform is suspended and fixed to the mounting position of the rod head by multiple positioning wires.

[0007] Furthermore, the platform is suspended in the mounting position of the rod head by two positioning wires. Both positioning wires are connected to the platform, with both ends of one positioning wire extending forward to the front end of the platform and connected to the rod head, while the two ends of the other positioning wire extend to the sides of the platform and are connected to the rod head, thus forming a multi-point tensioning and positioning structure.

[0008] Furthermore, the free ends of each positioning wire are detachably locked and fixed to the rod head by locking screws.

[0009] Furthermore, the positioning wire is made of beryllium copper.

[0010] Based on the same inventive concept, the present invention also provides a transmission electron microscope cryogenic sample rod, comprising a hollow rod body, a cold source component installed in the rod body, a metal cooling conductor component, and any of the above-described stage mechanisms, wherein the rod head of the stage mechanism is connected to the front end of the rod body, the cooling conductor component includes two connectors, and a plurality of metal wires are connected between the two connectors, a first embedded hole is formed on the stage, a second embedded hole is formed on the cold source component, and the two connectors of the cooling conductor component are respectively embedded in the first embedded hole and the second embedded hole.

[0011] Furthermore, a groove is formed near the first recessed hole in the cold source component, and a temperature sensor is embedded in the groove.

[0012] Furthermore, the rod body includes a front section and a rear section, which are spliced ​​together by a flange connection structure, and a rubber pad for sealing and shock absorption is provided at the connection between the front section and the rear section.

[0013] Furthermore, a cylindrical handle is fitted at the flange connection between the front and rear sections of the rod.

[0014] Furthermore, the cold source component is a liquid nitrogen inlet / outlet pipe used to transfer liquid nitrogen, and a gap is formed between the inner wall of the rod and the liquid nitrogen inlet / outlet pipe to reduce heat conduction.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the stage mechanism and transmission electron microscope cryogenic sample rod described in this invention, the stage is suspended and fixed in the mounting position of the rod head by positioning wires. There is no direct contact between the stage and the mounting position, but they are fixedly connected by positioning wires. This design can effectively reduce the cross-sectional area of ​​the heat conduction at the connection and fixing point between the stage and the rod head, and the temperature itself can be maintained more stably. It reduces the amount of cooling contraction caused by temperature changes, which is beneficial to improving the stability of the stage. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the platform mechanism according to an embodiment of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the platform mechanism according to another embodiment of the present invention.

[0019] Figure 3 This is an exploded three-dimensional structural diagram of the stage according to an embodiment of the present invention.

[0020] Figure 4 This is a three-dimensional structural diagram of the stage from another angle according to an embodiment of the present invention.

[0021] Figure 5 This is a three-dimensional structural diagram of the cooling conductor according to an embodiment of the present invention.

[0022] Figure 6 yes Figure 5 A magnified view of section A in the image.

[0023] Figure 7 This is a three-dimensional structural diagram of the cold source component according to an embodiment of the present invention.

[0024] Figure 8 This is a three-dimensional structural schematic diagram of the transmission electron microscope cryosample holder according to an embodiment of the present invention.

[0025] Figure 9 This is a partial structural schematic diagram of the transmission electron microscope cryosample holder according to an embodiment of the present invention.

[0026] Figure 10 This is a cross-sectional view of the transmission electron microscope cryosample holder according to an embodiment of the present invention.

[0027] Label Explanation:

[0028] 1. Rod head, 2. Platform, 3. Positioning wire, 4. Rod body, 5. Cooling source, 6. Cooling conductor, 7. Temperature sensor, 8. Handle, 11. Mounting position, 21. First recess, 41. Front rod section, 42. Rear rod section, 43. Rubber pad, 51. Second recess, 52. Groove, 61. Connector, 62. Metal wire. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] Please refer to the appendix. Figure 1 To be continued Figure 4One embodiment of the present invention provides a stage mechanism suitable for a transmission electron microscope (TEM) cryogenic sample holder, including a holder head 1 and a stage 2. The holder head 1 has a mounting position 11 for mounting the stage 2, and the stage 2 is correspondingly placed in the mounting position 11. A positioning wire 3 for tensioning and positioning is connected between the holder head 1 and the stage 2. The stage 2 is configured to be suspended and fixed in the mounting position 11 of the holder head 1 by the positioning wire 3. It is understood that in this embodiment, the stage 2 is suspended and fixed in the mounting position 11 of the holder head 1 by the positioning wire 3. There is no direct contact between the stage 2 and the mounting position 11; instead, they are fixedly connected by the positioning wire 3. This design effectively reduces the cross-sectional area of ​​the cooling conductor at the connection point between the stage and the holder head 1, allowing for more stable temperature maintenance and reducing the amount of cooling contraction caused by temperature changes, thus improving the stability of the stage.

[0032] Please refer to the appendix. Figure 1 To be continued Figure 4 In one preferred embodiment, the platform 2 is suspended and fixed to the mounting position 11 of the rod head 1 by multiple positioning wires 3. Preferably, in this embodiment, the platform 2 is suspended and fixed to the mounting position 11 of the rod head 1 by two positioning wires 3. Both positioning wires 3 are connected to the platform 2, with both ends of one positioning wire 3 extending forward from the front end of the platform 2 and connected to the rod head 1, while the two ends of the other positioning wire 3 extend towards both sides of the platform 2 and are connected to the rod head 1, thus forming a three-point or multi-point tensioning and positioning structure. However, those skilled in the art should understand that in other embodiments, the platform 2 can also be tensioned and positioned using other numbers of positioning wires 3, and is not limited to the specific implementation disclosed in this embodiment, as long as the platform 2 can be stably suspended and fixed to the mounting position 11 of the rod head 1, and the cross-sectional area for heat conduction at the connection between the platform 2 and the rod head 1 is reduced, thus minimizing the impact of temperature changes on the platform 2.

[0033] Please refer to the appendix. Figure 1 To be continued Figure 4 In one preferred embodiment, the free ends of each positioning wire 3 are detachably locked and fixed to the rod head 1 by locking screws. It is understood that in this embodiment, by suspending and tightening the platform 2 in the mounting position 11 of the rod head 1 using the positioning wires 3, the impact of cooling contraction caused by temperature changes on the platform 2 is reduced, effectively improving the stability of the platform 2. Furthermore, after removing the corresponding screws, the platform 2 can be quickly and conveniently disassembled, maintained, or replaced.

[0034] Please refer to the appendix. Figure 1 To be continued Figure 4 In one preferred embodiment, the positioning wire 3 is a beryllium copper positioning wire.

[0035] Please refer to the appendix. Figure 1 To be continued Figure 10 One embodiment of the present invention also provides a transmission electron microscope (TEM) cryogenic sample rod, comprising a hollow rod body 4, a cold source component 5 installed within the rod body 4, a metal cooling conductor 6, and a stage mechanism according to any of the above embodiments. The rod head 1 of the stage mechanism is connected to the front end of the rod body 4. The cooling conductor 6 includes two connectors 61, with a plurality of metal wires 62 connected between the two connectors 61. A first recess 21 is formed on the stage 2, and a second recess 51 is formed on the cold source component 5. The two connectors 61 of the cooling conductor 6 are respectively embedded in the first recess 21 and the second recess 51. In this embodiment, preferably, the cooling conductor 6 is a copper cooling conductor structure. The cold source component 5 is a liquid nitrogen inlet / outlet pipe for transmitting liquid nitrogen; its specific structure and principle are existing technologies and can be designed with reference to existing technologies such as the liquid nitrogen inlet / outlet pipe structure in CN214505438U. However, those skilled in the art should understand that in other embodiments, the cold source component 5 can also be other types of cold source structures, such as the cooling jug in prior art CN216719864U, as long as a suitable cold source can be provided. It is understood that in this embodiment, the cold source component 5 and the stage 2 are connected by a flexible cooling conductor 6. The cooling conductor 6 includes two connectors 61 and several metal wires 62 connected between the two connectors 61. During temperature conduction, the change in the shape of the thin metal wires overcomes the force of cooling contraction, which can greatly improve the stability of the stage 2 and reduce the positional shift caused by the force of cooling contraction on the stage 2 during temperature conduction.

[0036] Please refer to the appendix. Figure 1 In one preferred embodiment, a groove 52 is formed on the periphery of the cold source component 5 (liquid nitrogen inlet / outlet pipe) near the first recess 21, and a temperature sensor 7 is embedded in the groove 52. Preferably, in this embodiment, the temperature sensor 7 is a temperature-sensing thermistor, specifically a PT100 model. However, those skilled in the art should understand that in other embodiments, the location and specific model of the temperature sensor 7 are not limited to the specific implementation disclosed in this embodiment, as long as it can measure the temperature at the connection point between the cold source component 5 and the cooling conductor 6.

[0037] Please refer to the appendix. Figure 1In one preferred embodiment, the rod 4 includes a front section 41 and a rear section 42, which are joined together by a flange connection structure. A rubber pad 43 for sealing and shock absorption is provided at the connection between the front section 41 and the rear section 42. In this embodiment, preferably, the rear section 42 is a copper tube. The rubber pad 43 at the connection between the front section 41 and the rear section 42 improves the sealing of the connection and also has a shock absorption effect, which helps to improve the stability of the platform 2.

[0038] Please refer to the appendix. Figure 1 In one preferred embodiment, a cylindrical handle portion 8 is sleeved at the flange connection position between the front rod 41 and the rear rod 42.

[0039] Please refer to the appendix. Figure 1 In one preferred embodiment, a gap is formed between the inner wall of the rod 4 and the cold source component 5 (liquid nitrogen inlet / outlet pipe) to reduce heat conduction. It is understood that in this embodiment, by providing a gap between the inner wall of the rod 4 and the cold source component 5, heat transfer between the cold source component 5 and the rod 4 is reduced, thereby effectively reducing heat loss.

[0040] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features therein. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

Claims

1. A stage mechanism suitable for cryogenic sample holders in transmission electron microscopy, characterized in that: The rod head (1) and the carrier platform (2) are included, the mounting position (11) for mounting the carrier platform (2) is formed on the rod head (1), the carrier platform (2) is correspondingly placed in the mounting position (11), and the positioning silk thread (3) for tension positioning is connected between the rod head (1) and the carrier platform (2), and the carrier platform (2) is suspendedly fixed in the mounting position (11) of the rod head (1) through the positioning silk thread (3).

2. The stage mechanism of claim 1, wherein: The carrier platform (2) is suspendedly fixed in the mounting position (11) of the rod head (1) through the plurality of positioning silk threads (3).

3. The stage mechanism of claim 2, wherein: The carrier platform (2) is suspendedly fixed in the mounting position (11) of the rod head (1) through the two positioning silk threads (3), both of the two positioning silk threads (3) are connected on the carrier platform (2), and both ends of one of the two positioning silk threads (3) are extended to the front end of the carrier platform (2) and connected together with the rod head (1), and both ends of the other of the two positioning silk threads (3) are extended to the two sides of the carrier platform (2) and connected together with the rod head (1), thereby forming a multi-point tension positioning structure.

4. The stage mechanism of claim 3, wherein: The free end of each positioning silk thread (3) is detachably locked and fixed together with the rod head (1) through a locking screw.

5. The stage mechanism of claim 1, wherein: The positioning silk thread (3) is a beryllium copper positioning silk thread.

6. A transmission electron microscope cryo-sample rod, characterized by: The carrier platform mechanism includes a hollow rod body (4), a cold source element (5) mounted in the rod body (4), a metal cold conducting element (6), and the carrier platform mechanism of any one of claims 1 to 5, wherein the rod head (1) of the carrier platform mechanism is connected at the front end of the rod body (4), the cold conducting element (6) includes two connecting heads (61), a plurality of metal wires (62) are connected between the two connecting heads (61), the carrier platform (2) is formed with a first embedding hole (21), the cold source element (5) is formed with a second embedding hole (51), and the two connecting heads (61) of the cold conducting element (6) are embedded in the first embedding hole (21) and the second embedding hole (51), respectively.

7. The transmission electron microscopy frozen sample rod of claim 6, wherein: A groove (52) is formed at the position of the cold source element (5) near the first embedding hole (21), and a temperature sensor (7) is embedded in the groove (52).

8. The transmission electron microscopy frozen sample rod of claim 6, wherein: The rod body (4) includes a front rod (41) and a rear rod (42), the front rod (41) and the rear rod (42) are spliced together through a flange connection structure, and a rubber pad (43) for sealing and damping is arranged at the connection position of the front rod (41) and the rear rod (42).

9. The transmission electron microscopy cryogenic sample rod of claim 8, wherein: A cylindrical handle portion (8) is sleeved at the flange connection position of the front rod (41) and the rear rod (42).

10. The transmission electron microscopy cryogenic sample rod of claim 6, wherein: The cold source element (5) is a liquid nitrogen inlet and outlet pipeline for transmitting liquid nitrogen, and an interval gap for reducing heat conduction is formed between the inner wall of the rod body (4) and the liquid nitrogen inlet and outlet pipeline.

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