A test fixture with spring test probes

Abstract

The utility model discloses a test fixture, include: spring test probe, spring test probe includes the needle head, spring and connecting wire that connect gradually, spring test probe does not include needle cover, fixed structure, fixed structure includes fixed hole, spring test probe can be accommodated in fixed hole, fixed hole includes the first fixed hole and second fixed hole of coaxial arrangement, the diameter of first fixed hole is greater than the outer diameter of spring, spring with needle head can be accommodated in first fixed hole, second fixed hole sets up below first fixed hole, the diameter of second fixed hole is less than the outer diameter of spring, forms support step at the junction of first fixed hole and second fixed hole, and one end of support step and spring abuts, and support step can play the supporting effect to spring. Test fixture whole simple structure, and preparation is simple.

Description

Technical Field

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

[0002] Spring test probes are precision components that utilize the elastic pressure of a compression spring to establish reliable electrical contact between the probe tip and the test point. They are widely used in online / offline testing in PCB, semiconductor, battery, and automotive electronics industries. However, the trend towards miniaturization and precision in spring test probes has increased the difficulty of their manufacturing. Simplifying the structure of spring test probes and reducing the complexity of their production remains a key technical challenge. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a test fixture with a spring test probe, which has a simple structure and a simple manufacturing process.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a test fixture with a spring test probe, comprising: A spring test probe, comprising a needle, a spring, and a connecting wire connected in sequence, excluding a needle sleeve; A fixing structure, the fixing structure including a fixing hole, wherein the spring test probe can be accommodated in the fixing hole; The fixing holes include a first fixing hole and a second fixing hole arranged coaxially. The diameter of the first fixing hole is larger than the outer diameter of the spring, and the spring and the needle can be accommodated in the first fixing hole. The second fixing hole is located below the first fixing hole, and the diameter of the second fixing hole is smaller than the outer diameter of the spring. A support step is formed at the connection between the first fixing hole and the second fixing hole. The support step abuts against one end of the spring, and the support step can support the spring.

[0005] The spring-loaded test probe consists of a needle tip, a spring, and a connecting wire, excluding the needle sleeve. The spring not only provides elasticity but also transmits signals, simplifying the probe's structure and further simplifying its manufacturing process. By creating a support step within the fixing hole using first and second through holes of different radii, the probe is fixed without the need for additional fixing components, resulting in a simple overall structure and easy fabrication of the test fixture.

[0006] Furthermore, the diameter of the second fixing hole is greater than or equal to the diameter of the connecting wire, which can pass through the second fixing hole and connect to an external device.

[0007] Furthermore, the ends of the connecting wire and the spring are fixedly connected by soldering.

[0008] Furthermore, the needle includes a first connecting portion, which is connected to an external probe. A positioning groove recessed along the axial direction of the needle is provided at the end of the first connecting portion. The positioning groove abuts against the external probe and can accommodate at least a portion of the external probe.

[0009] Furthermore, the positioning groove has a frustum-shaped structure, and the angle formed by the generatrix of the frustum and the axis is 15~30°.

[0010] Furthermore, the needle includes a guide portion, which is connected to the first connecting portion and is sleeved within the spring.

[0011] Furthermore, the ratio of the length of the guide portion to the free length of the spring is 1 / 4 to 1 / 2.

[0012] Furthermore, the needle includes a second connecting portion, which is located between the guide portion and the first connecting portion and is integrally connected with the guide portion and the first connecting portion. The second connecting portion is also tolerantly fitted to the end of the spring.

[0013] Furthermore, the diameter of the second connecting part is smaller than the diameter of the guide part, and a first limiting step is formed at the connection between the second connecting part and the guide part.

[0014] Furthermore, the diameter of the second connecting part is smaller than the diameter of the first connecting part, and a second limiting step is formed at the connection between the second connecting part and the first connecting part. 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 1 This is a perspective view of a spring test probe according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a test fixture according to an embodiment of the present invention; Figure 3for Figure 2 Enlarged view of point B in the middle; Figure 4 for Figure 2 Enlarged view of point A in the middle; Figure 5 This is a perspective view of a needle according to an embodiment of the present invention.

[0018] In the figure: 1. Needle tip; 11. First connecting part; 111. Positioning groove; 112. Angle; 12. Second connecting part; 13. Guide part; 2. Spring; 3. Connecting line; 4. Fixing structure; 5. Fixing hole; 51. First fixing hole; 52. Second fixing hole; 53. Support step. 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 As shown, this embodiment of a test fixture with a spring test probe includes a spring test probe, which comprises a needle 1, a spring 2, and a connecting wire 3 connected in sequence. Existing test probes generally also include a needle sleeve, which is disposed outside the spring 2. The spring test probe in this design only includes three structures: the needle 1, the spring 2, and the connecting wire 3, without a needle sleeve, making the structure simpler and easier to manufacture.

[0021] See appendix Figure 2 and attached Figure 3 As shown, the test fixture also includes a fixing structure 4. The spring test probe is connected to the fixing structure 4. The fixing structure 4 is provided with fixing holes 5. The fixing holes 5 include a first fixing hole 51 and a second fixing hole 52 arranged coaxially. The diameter of the first fixing hole 51 is larger than the outer diameter of the spring 2. The spring 2 and the needle 1 can be accommodated in the first fixing hole 51, and the first fixing hole 51 can protect the spring 2 and the needle 1. The second fixing hole 52 is provided below the first fixing hole 51. The diameter of the second fixing hole 52 is smaller than the outer diameter of the spring 2. A support step 53 is formed at the connection between the first fixing hole 51 and the second fixing hole 52. The support step 53 abuts against one end of the spring 2. The support step 53 supports the spring 2, so that the spring 2 and the needle 1 can be accommodated in the first fixing hole 51 and will not slide out of the first fixing hole 51 due to gravity or the pressure of the external probe.

[0022] In some embodiments, the diameter of the second fixing hole 52 is larger than the diameter of the connecting wire 3, and the connecting wire 3 can pass through the second fixing hole 52 to connect to an external device.

[0023] In some embodiments, the diameter of the second fixing hole 52 is equal to the diameter of the connecting wire 3. The second fixing hole 52 and the connecting wire 3 are interference-fitted. The second fixing hole 52 can clamp and fix the connecting wire 3, thereby fixing the spring test probe.

[0024] In some embodiments, the ends of the connecting wire 3 and the spring 2 are soldered together to improve the stability of the connection between the spring 2 and the connecting wire 3 and to prevent the connecting wire 3 and the spring 2 from falling off, which would cause signal interruption.

[0025] See appendix Figure 4 and attached Figure 5 As shown, in some embodiments, the needle 1 includes a first connecting portion 11, a second connecting portion 12, and a guide portion 13 connected in sequence. The first connecting portion 11 is connected to an external probe, and a positioning groove 111 recessed along the axial direction of the needle 1 is provided at the end of the first connecting portion 11. When the needle 1 is connected to the external probe, at least a portion of the external probe can be accommodated in the positioning groove 111. The positioning groove 111 can limit the movement of the external probe.

[0026] In some embodiments, the positioning groove 111 has a frustum-shaped structure, and the included angle 112 formed by the generatrix of the frustum and its axis is 15~30°, to ensure that the positioning groove 111 can limit the external probe and prevent the external probe from shifting during the test, thus causing it to detach from the first connecting part 11. The ratio of the area of ​​the upper part of the positioning groove 111 to the area of ​​the end of the first connecting part 11 is greater than 25%, to ensure that the external probe can communicate smoothly with the first connecting part 11.

[0027] In some embodiments, the guide portion 13 is connected to the first connecting portion 11 and is sleeved inside the spring 2 to guide the spring 2, and the spring 2 can be compressed along the direction of the guide portion 13.

[0028] In some embodiments, the ratio of the length of the guide portion 13 to the free length of the spring 2 is 1 / 4 to 1 / 2, ensuring that the guide portion 13 can be tightly connected to the spring, maintaining appropriate pull force, and ensuring full contact without falling off, thus ensuring that the spring 2 has a certain degree of elastic freedom, thereby ensuring that the needle 1 can move up and down along the direction of the spring 2. In this way, the external probe can be elastic or not, thus improving the applicability of the test fixture.

[0029] In some embodiments, the second connecting portion 12 is located between the guide portion 13 and the first connecting portion 11, and is integrally connected with the guide portion 13 and the first connecting portion 11. The second connecting portion 12 is tolerance-fitted to the end of the spring 2.

[0030] In some embodiments, the diameter of the second connecting portion 12 is smaller than the diameter of the guide portion 13, and a first limiting step is formed at the connection between the second connecting portion 12 and the guide portion 13. The first limiting step ensures that the spring 2 and the second connecting portion 12 are more firmly connected and will not slip to the guide portion 13.

[0031] In some embodiments, the diameter of the second connecting portion 12 is smaller than the diameter of the first connecting portion 11, and a second limiting step is formed at the connection between the second connecting portion 12 and the first connecting portion 11. The second limiting step ensures that the spring 2 and the second connecting portion 12 are more firmly connected and will not shift towards the first connecting portion 11.

[0032] 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.

[0033] 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.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] 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 test fixture with a spring test probe, characterized in that, include: A spring test probe, comprising a needle (1), a spring (2) and a connecting wire (3) connected in sequence, wherein the spring test probe does not include a needle sleeve; The fixing structure (4) includes a fixing hole (5), and the spring test probe can be accommodated in the fixing hole (5); The fixing hole (5) includes a first fixing hole (51) and a second fixing hole (52) arranged coaxially. The diameter of the first fixing hole (51) is larger than the outer diameter of the spring (2). The spring (2) and the needle (1) can be accommodated in the first fixing hole (51). The second fixing hole (52) is located below the first fixing hole (51). The diameter of the second fixing hole (52) is smaller than the outer diameter of the spring (2). A support step (53) is formed at the connection between the first fixing hole (51) and the second fixing hole (52). The support step (53) abuts against one end of the spring (2). The support step (53) can support the spring (2).

2. The test fixture with a spring test probe according to claim 1, characterized in that, The diameter of the second fixing hole (52) is greater than or equal to the diameter of the connecting wire (3), and the connecting wire (3) can pass through the second fixing hole (52) and connect to an external device.

3. The test fixture with a spring test probe according to claim 1, characterized in that, The ends of the connecting line (3) and the spring (2) are fixedly connected by soldering.

4. The test fixture with a spring test probe according to claim 1, characterized in that, The needle (1) includes a first connecting part (11) which is connected to an external probe. A positioning groove (111) is provided at the end of the first connecting part (11) in the axial direction of the needle (1). The positioning groove (111) abuts against the external probe. The positioning groove (111) can accommodate at least a part of the external probe.

5. The test fixture with a spring test probe according to claim 4, characterized in that, The positioning groove (111) is a frustum-shaped structure, and the included angle (112) formed by the generatrix and the axis of the frustum is 15~30°.

6. The test fixture with a spring test probe according to claim 4, characterized in that, The needle (1) includes a guide (13), which is connected to the first connecting part (11) and is sleeved inside the spring (2).

7. The test fixture with a spring test probe according to claim 6, characterized in that, The ratio of the length of the guide (13) to the free length of the spring (2) is 1 / 4 to 1 / 2.

8. The test fixture with a spring test probe according to claim 6, characterized in that, The needle (1) includes a second connecting part (12), which is located between the guide part (13) and the first connecting part (11) and is integrally connected with the guide part (13) and the first connecting part (11). The second connecting part (12) is tightly fitted to the end of the spring (2) with tolerance.

9. The test fixture with a spring test probe according to claim 8, characterized in that, The diameter of the second connecting part (12) is smaller than the diameter of the guide part (13), and a first limiting step is formed at the connection between the second connecting part (12) and the guide part (13).

10. The test fixture with a spring test probe according to claim 8, characterized in that, The diameter of the second connecting part (12) is smaller than the diameter of the first connecting part (11), and a second limiting step is formed at the connection between the second connecting part (12) and the first connecting part (11).

Images