A precision test probe

Abstract

The utility model discloses a kind of precision test probes, including sleeve, sleeve is columnar structure, the diameter of upper end and lower end of sleeve is equal, accommodating cavity is arranged in the axial direction of sleeve, needle, spring and connecting wire are sequentially arranged in accommodating cavity;Concave and convex part is arranged on sleeve, recessed part recessed to sleeve center line direction is formed on the outer surface of sleeve, simultaneously, in accommodating cavity, the inner wall of sleeve is formed to the direction of protruding part protruding to the center line of sleeve;Concave and convex part includes first concave and convex part, first concave and convex part is set to the position of sleeve close to lower end, and and the end position of spring is adapted. By setting first concave and convex part, spring is limited, the lower end of sleeve does not need to close, the diameter of the first end and lower end of needle tube is equal, more easily processing and manufacturing;Recessed part is recessed inward on the outer surface of sleeve, the outer surface of sleeve is still smooth structure as a whole, when precision test probe is installed on fixed jig, probe is more easily installed.

Description

Technical Field

[0001] This utility model relates to the field of testing technology, specifically to a precision testing probe. Background Technology

[0002] Precision testing probes are miniaturized bridges that shrink macroscopic testing systems to the micrometer or even nanometer scale while maintaining the original system's accuracy and reliability. They are widely used in high-end manufacturing and research scenarios such as semiconductors, new energy, biomedicine, and materials science. However, the small size of precision testing probes increases the difficulty of their production. Simplifying the structure of precision testing probes and reducing the difficulty of their manufacturing remains a technical problem to be solved. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a precision test probe with a simple structure that can reduce the difficulty of manufacturing the probe.

[0004] To achieve the above objectives, the present invention employs a precision testing probe, comprising a sleeve having a cylindrical structure, the upper and lower ends of the sleeve having equal diameters, and a receiving cavity provided in the axial direction of the sleeve, wherein a needle, a spring, and a connecting wire are sequentially arranged within the receiving cavity. The sleeve is provided with a concave and convex portion, which includes a recessed portion and a protruding portion. A recessed portion is formed on the outer surface of the sleeve in the direction of the sleeve centerline. At the same time, a protruding portion is formed on the inner wall of the sleeve in the direction of the sleeve centerline within the receiving cavity. The concave-convex portion includes a first concave-convex portion, which is located near the lower end of the sleeve and is adapted to the end position of the spring.

[0005] By setting the first concave-convex part to limit and restrict the spring, the lower end of the sleeve does not need to be tapered, and the diameters of the first and lower ends of the needle tube are equal, making it easier to process and manufacture, and reducing the difficulty of preparing precision test probes. Since the protrusion is set to bulge towards the central axis within the receiving cavity, the welding process between the connecting wire and the protrusion is easier, reducing the welding difficulty. The concave part is recessed inward on the outer surface of the sleeve, and the outer surface of the sleeve is still a smooth structure, making it easier to install the precision test probe on the fixing fixture. Therefore, only the concave-convex part on the sleeve is needed to limit the spring, resulting in a simple structure and easier manufacturing.

[0006] Furthermore, two first concave and convex portions are provided, distributed on both sides of the sleeve with the central axis of the sleeve as the axis of symmetry, and the width of the first concave and convex portions in the circumferential direction of the sleeve is less than 1 / 4 of the circumferential length of the sleeve.

[0007] Furthermore, the outer diameter of the sleeve is 0.20mm~0.30mm, and the inner diameter is 0.15~0.25mm.

[0008] Furthermore, the needle includes a connector located at the upper end of the cannula for connection with an external probe. At the end of the connector, a positioning groove recessed along the axial direction of the cannula is provided, so that the external probe can be accommodated in the positioning groove when the needle is connected to the external probe.

[0009] Furthermore, the needle includes a first conductive element located at the other end of the needle and connected to a spring located within the receiving cavity; a second conductive element is provided between the first conductive element and the connecting element, the second conductive element being a columnar structure with a diameter smaller than that of the first conductive element, and a step is formed at the connection between the first conductive element and the second conductive element.

[0010] Furthermore, the protrusion includes a second protrusion, which is disposed near the upper end of the sleeve and is adapted to the position of the step.

[0011] Furthermore, the ratio of the length of the second conductive element to the length of the needle is 1 / 3 to 2 / 3, and the ratio of the length of the spring to the length of the sleeve is 1 / 3 to 2 / 3.

[0012] Furthermore, a guide is provided at one end of the first conductive member near the spring, and the end of the spring is sleeved on the guide.

[0013] Furthermore, the guide is a cone, and the bottom of the cone is integrally connected to the first conductive element.

[0014] Furthermore, the guide member has a columnar structure, and the connector, the second conductive member, the first conductive member, and the guide member are integrally connected. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a perspective view of a precision test probe according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a precision test probe according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of a precision test probe according to another embodiment of the present invention; Figure 4 for Figure 3 A magnified view of a portion of the image.

[0018] In the diagram: 1. Sleeve; 11. Upper end; 12. Lower end; 13. Receiving cavity; 2. Needle; 21. Connector; 211. Positioning groove; 22. First conductive element; 23. Second conductive element; 24. Guide element; 3. Spring; 4. Connecting line; 5. Concave and convex parts; 51. First concave and convex part; 52. Second concave and convex part; 53. Recessed part; 54. Protruding part. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0020] See appendix Figure 1-4 As shown, a precision test probe in this embodiment includes a sleeve 1, which is a cylindrical structure. A receiving cavity 13 is provided in the axial direction of the sleeve 1, and a needle 2, a spring 3 and a connecting wire 4 are arranged in sequence in the receiving cavity 13.

[0021] The upper end 11 of the sleeve 1 is connected to the needle 2, and the lower end 12 is connected to the connecting wire 4. The upper end 11 and the lower end 12 of the sleeve 1 have the same diameter. In the existing probe sleeve 1, the lower end 12 is narrowed so that the diameter of the lower end 12 is smaller than the diameter of the upper end 11, in order to limit the spring. In this technical solution, the diameters of the upper end and the lower end 12 of the sleeve 1 are equal, which makes it easier to process and manufacture, and reduces the difficulty of preparing precision test probes.

[0022] In some embodiments, in order to limit the spring 3, a concave-convex portion 5 is provided on the sleeve 1, which is formed by clamping the sleeve 1. Specifically, the concave-convex portion 5 includes a recessed portion 53 and a protruding portion 54. The recessed portion 53 is formed on the outer surface of the sleeve 1 in the radial direction toward the center line of the sleeve 1, while the protruding portion 54 is formed on the inner wall of the sleeve 1 in the receiving cavity 13, protruding along the radial direction of the sleeve 1 toward the center line of the sleeve 1.

[0023] In some embodiments, the protrusion 5 includes a first protrusion 51, which is located near the lower end 12 of the sleeve 1. There are two first protrusions 51, which are distributed on both sides of the sleeve 1 with the central axis of the sleeve 1 as the axis of symmetry. During the manufacturing process of the probe, the two first protrusions 51 can be formed simultaneously by clamping and squeezing the sleeve 1.

[0024] In some embodiments, the width of the protrusion 5 in the circumferential direction of the sleeve 1 is less than 1 / 4 of the circumferential length of the sleeve 1. By setting the width of the protrusion, the outer surface of the sleeve 1 is ensured to remain a smooth structure, making it easier to install the precision test probe on the fixture.

[0025] The protrusion 54 of the first concave-convex portion 51, protruding towards the central axis within the receiving cavity 13, serves two purposes: firstly, it prevents the spring 3 located within the receiving cavity 13 from moving towards the tail of the sleeve 1, thus limiting the movement of the spring 3; secondly, the connecting wire 4 needs to be welded to the inner wall of the sleeve 1 to secure it. Because the protrusion 54 protrudes towards the central axis within the receiving cavity 13, welding the connecting wire 4 and the protrusion 54 is easier during the welding connection process.

[0026] Since the recessed portion 53 is recessed inward on the outer surface of the sleeve 1, the outer surface of the sleeve 1 is still a smooth structure, making it easier to install the precision test probe on the fixture.

[0027] In some embodiments, the outer diameter of the sleeve 1 is 0.20mm~0.30mm and the inner diameter is 0.15~0.25mm. Since the precision test probe is small in size and requires high precision, its production and preparation are relatively difficult. By setting the concave and convex parts 5, the difficulty of preparing and installing the probe is reduced.

[0028] In some embodiments, the outer diameter of the sleeve 1 is 0.25 mm and the inner diameter is 0.2 mm.

[0029] In some embodiments, the needle 2 is located within the receiving cavity 13. The needle 2 includes a connector 21 located at the upper end 11 of the sleeve 1 for connection with an external probe. At the end of the connector 21, a positioning groove 211 recessed along the axial direction of the sleeve is provided. When the needle 2 is connected to the external probe, the external probe can be accommodated within the positioning groove 211. The positioning groove 211 can limit the movement of the external probe.

[0030] In some embodiments, the needle 2 includes a first conductive member 22 located at the other end of the needle and connected to a spring 3 located within a receiving cavity 13. A second conductive member 23 is disposed between the first conductive member 22 and the connector 21. The second conductive member 23 has a columnar structure with a diameter smaller than that of the first conductive member 22, and a step is formed at the connection between the first conductive member 22 and the second conductive member 23.

[0031] The protrusion 5 includes a second protrusion 52, which is located near the beginning of the sleeve 1 and is positioned to match the second conductive member 23. On one hand, the protrusion 54 of the second protrusion 52 acts as a barrier against the first conductive member 22, preventing it from detaching from the beginning of the sleeve 1, thereby limiting the needle 2 and preventing it from falling out of the sleeve 1. On the other hand, the diameter of the second conductive member 23 is smaller than the distance between the protrusions 54 of the two opposing second protrusions 52, allowing the needle 2 to move towards the spring 3, with a maximum movement distance equal to the length of the second conductive member 23.

[0032] In some embodiments, the ratio of the length of the second conductive member 23 to the length of the needle 2 is 1 / 3 to 2 / 3 to ensure that the needle 2 has a certain range of travel within the receiving cavity 13. Inside the sleeve 1, the needle 2 is connected to the connecting wire 4 via a spring 3, and the ratio of the length of the spring 3 to the length of the sleeve is 1 / 3 to 2 / 3. During testing, the external probe contacts and presses down on the positioning groove 211 of the needle 2, compressing the spring 3. The needle 2 is restricted by the second protrusion 52, and the spring 3 is restricted by the first protrusion 51. The external probe can be either elastic or non-elastic.

[0033] In some embodiments, a guide 24 is provided at one end of the first conductive member 22 near the spring 3, and the end of the spring 3 is sleeved on the guide 24. The guide 24 can limit the spring 3 and prevent the spring 3 from twisting.

[0034] In some embodiments, the guide member 24 is a cone or a columnar structure. The specific structure depends on the actual situation and is not limited in this application.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A precision test probe, characterized in that, Includes a sleeve (1), which is a columnar structure. The upper end (11) and lower end (12) of the sleeve (1) have the same diameter. A receiving cavity (13) is provided in the axial direction of the sleeve (1). A needle (2), a spring (3) and a connecting wire (4) are arranged in sequence in the receiving cavity (13). The sleeve (1) is provided with a concave-convex portion (5), which includes a recessed portion (53) and a protruding portion (54). A recessed portion (53) is formed on the outer surface of the sleeve (1) in the direction of the center line of the sleeve (1). At the same time, a protruding portion (54) is formed on the inner wall of the sleeve (1) in the cavity (13) in the direction of the center line of the sleeve (1). The concave-convex portion (5) includes a first concave-convex portion (51), which is located near the lower end (12) of the sleeve (1) and is adapted to the end position of the spring (3).

2. The precision test probe according to claim 1, characterized in that, Two first concave and convex portions (51) are provided, with the central axis of the sleeve (1) as the axis of symmetry, and are distributed on both sides of the sleeve (1). The width of the first concave and convex portions (51) in the circumferential direction of the sleeve (1) is less than 1 / 4 of the circumferential length of the sleeve (1).

3. The precision test probe according to claim 1, characterized in that, The outer diameter of the sleeve (1) is 0.20mm~0.30mm and the inner diameter is 0.15~0.25mm.

4. The precision test probe according to claim 1, characterized in that, The needle (2) includes a connector (21) located at the upper end (11) of the sleeve (1) for connecting with an external probe. At the end of the connector (21), a positioning groove (211) is provided that is recessed along the axial direction of the sleeve. When the needle (2) is connected with the external probe, the external probe can be accommodated in the positioning groove (211).

5. The precision test probe according to claim 4, characterized in that, The needle (2) includes a first conductive element (22), which is located at the other end of the needle (2) and connected to a spring (3) located in the receiving cavity (13); a second conductive element (23) is provided between the first conductive element (22) and the connecting element (21), the second conductive element (23) is a columnar structure with a diameter smaller than that of the first conductive element (22), and a step is formed at the connection between the first conductive element (22) and the second conductive element (23).

6. The precision test probe according to claim 5, characterized in that, The concave-convex portion (5) includes a second concave-convex portion (52), which is disposed near the upper end (11) of the sleeve (1) and is adapted to the position of the step.

7. The precision test probe according to claim 5, characterized in that, The ratio of the length of the second conductive element (23) to the length of the needle (2) is 1 / 3 to 2 / 3, and the ratio of the length of the spring (3) to the length of the sleeve (1) is 1 / 3 to 2 / 3.

8. The precision test probe according to claim 5, characterized in that, A guide (24) is provided at one end of the first conductive member (22) near the spring (3), and the end of the spring (3) is sleeved on the guide (24).

9. The precision test probe according to claim 8, characterized in that, The guide (24) is a cone, and the bottom of the cone is integrally connected to the first conductor (22).

10. The precision test probe according to claim 8, characterized in that, The guide (24) is a columnar structure, and the connector (21), the second conductor (23), the first conductor (22), and the guide (24) are integrally connected.

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