Low-impedance spring needle

Abstract

The low-impedance spring needle comprises a sleeve, a needle head and a spring piece, a limiting channel is arranged in the sleeve, a bottom plate and a positioning ring are arranged at the two ends of the sleeve respectively, the needle head is arranged in the positioning ring in a penetrating mode, a conductive sliding block arranged in the limiting channel in a penetrating mode is arranged at one end of the needle head, and the conductive sliding block makes contact with the channel wall of the limiting channel. A limiting groove and a guide groove are formed in the end, away from the needle head, of the conductive sliding block, and the guide groove is connected to the groove bottom of the limiting groove; a guide column located in the limiting channel is arranged on the bottom plate, the end, away from the bottom plate, of the guide column penetrates through the guide groove, the guide column is sleeved with the spring piece, and the two ends of the spring piece are connected with the groove bottom of the limiting groove and the bottom plate respectively. According to the utility model, high-performance signal transmission can be realized, the detection abdicating groove can effectively increase the contact area between the needle head and a detection target object during detection connection, and the signal transmission performance can be further improved.

Description

Technical Field

[0001] The utility model relates to the field of spring pin connectors, in particular to a low-impedance spring pin. Background Art

[0002] Spring needle, also known as spring probe, mainly consists of needle shaft, spring and needle tube. It is installed and riveted by precision instruments to form a spring probe. It is mainly used for current and signal transmission, generally for charging and conductive functions. It is widely used in precision connections in electronic products such as mobile phones, portable electronic devices, communications, automobiles, medical care, aerospace, etc.

[0003] As an important electrical connection component, the performance of pogo pins directly impacts the reliability of connections and signal transmission. In related technologies, pogo pins utilize a spring coupled with a pin shaft to contact the pin tube. Part of the current is transmitted through the spring, resulting in high impedance. During high-frequency signal transmission or precision measurement, these pogo pins often experience signal attenuation due to their high impedance. This leads to low signal transmission stability and the possibility of jamming during use. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a low-impedance spring pin with low signal attenuation during detection connection, reliable signal transmission, and smooth and stable reciprocating motion during use.

[0005] According to an embodiment of the utility model, a low-impedance spring needle includes a sleeve, a needle head, and a spring member. A limiting channel is provided in the sleeve, and a bottom plate and a positioning ring are provided at both ends of the sleeve. The needle head is inserted into the positioning ring. One end of the needle head is provided with a conductive slider inserted into the limiting channel. The conductive slider contacts the channel wall of the limiting channel. The other end of the needle head is hemispherical and has a detection groove in the center. The end of the conductive slider away from the needle head is provided with a limiting groove and a guide groove. The guide groove is connected to the bottom of the limiting groove.

[0006] A guide post located in the limiting channel is provided on the bottom plate, and the end of the guide post away from the bottom plate is inserted into the guide groove. The spring member is provided in the limiting channel and is sleeved outside the guide post. The two ends of the spring member are respectively connected to the bottom of the limiting groove and the bottom plate, so that the conductive slider forms a movement trend away from the bottom plate.

[0007] In this embodiment, a positioning groove is provided on the side wall of the conductive slider, an elastic conductive block is clamped in the positioning groove, and one end of the elastic conductive block abuts against the inner wall of the limiting channel.

[0008] In this embodiment, four positioning grooves are provided and are evenly distributed around the conductive slider, and an elastic conductive block is provided in each positioning groove.

[0009] In this embodiment, the surface of the elastic conductive block that contacts the inner wall of the limiting channel is an arc convex surface.

[0010] In this embodiment, the detection clearance groove is a groove structure with a circular notch.

[0011] In this embodiment, a reinforced conductive layer is provided on the surface of the needle at the end away from the conductive slider.

[0012] In this embodiment, the reinforced conductive layer is an elastic conductive layer.

[0013] In this embodiment, the low-impedance spring needle further includes an elastic washer, which is sleeved outside the needle head and located between the conductive slider and the positioning ring.

[0014] In this embodiment, the sleeve, the base plate, the positioning ring and the guide pillar are an integrally formed structure; the needle head and the conductive slider are an integrally formed structure.

[0015] The embodiments of the present invention have at least the following beneficial effects:

[0016] By setting the conductive slider in direct contact with the channel wall of the limiting channel and setting the guide post in sliding contact with the guide groove, the effective conductive contact area between the needle and the sleeve can be effectively increased, thereby effectively reducing the overall impedance of the low-impedance spring needle, and achieving high-performance signal transmission. The guide post and the limiting groove can form a good limiting effect on the spring part, and can effectively ensure the collimation of the spring part's telescopic movement, thereby significantly reducing the probability of problems such as jamming. The guide post and the guide groove can effectively improve the collimation of the conductive slider when sliding in the limiting channel, and can effectively improve the reliability of the movement of the low-impedance spring needle when it is telescopic. In addition, by setting a detection groove at the center of the hemispherical end of the needle, the contact area between the needle and the detection target of the low-impedance spring needle can be effectively increased when detecting the connection, thereby reducing the impedance between the needle and the detection target at this time, which can further improve the signal transmission performance, with small signal attenuation, and can meet the application requirements of high-frequency and high-speed signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a low-impedance spring pin according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the main structure of a low-impedance spring pin according to an embodiment of the present invention;

[0020] Figure 3 For the Figure 2Schematic diagram of the cross-sectional structure of A-A';

[0021] Figure 4 This is a schematic diagram of the exploded structure of a low-impedance spring pin according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the exploded structure of the low-impedance spring pin according to an embodiment of the present invention from another perspective.

[0023] Reference numerals:

[0024] Sleeve 100, limiting channel 110, bottom plate 120, positioning ring 130, guide post 140;

[0025] Needle 200, reinforced conductive layer 201, conductive slider 210, limiting groove 211, guide groove 212, positioning groove 213, detection clearance groove 220, elastic conductive block 230;

[0026] Spring member 300;

[0027] Elastic washer 400. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, left, right, front, back, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and 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. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of this utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] A spring-loaded probe, also known as a spring-type probe, primarily consists of a shaft, spring, and tube. Installed and riveted using precision instruments, it forms a spring-type probe. It's primarily used for current and signal transmission, typically for charging and conducting electricity. It's widely used for precision connections in mobile phones, portable electronic devices, communications, automotive, medical, aerospace, and other electronic products. As an important electrical connection component, the performance of a spring-loaded probe directly impacts the reliability of the connection and signal transmission. Traditional spring-loaded probes utilize a spring in conjunction with the shaft to contact the tube, with some current transmitted through the spring. This results in high impedance. During high-frequency signal transmission or precision measurement, these spring-loaded probes often experience signal attenuation, reflection, and electromagnetic interference due to their inherently high impedance. This results in low electrical signal transmission stability and insufficient signal integrity. Such spring-loaded probes are prone to poor contact or even damage due to structural instability when subjected to insertion and removal or vibration. Furthermore, they are prone to freezing and other undesirable issues during use, seriously impacting their service life and functional reliability.

[0033] While attempts have been made to reduce the impedance of pogo pins by optimizing materials and improving their structure, these methods often suffer from high costs, complex processes, or limited effectiveness. Designing a pogo pin with a simple structure, low manufacturing costs, and significantly reduced impedance, particularly for high-frequency and high-speed signal transmission, has become a pressing technical challenge for the industry.

[0034] The following reference Figure 1 To the attached Figure 5 , describing the low-impedance spring needle of the embodiment of the utility model, the signal attenuation of the detection connection is small, the signal transmission is reliable, and the reciprocating action during application is smooth and stable.

[0035] Reference Figures 1 to 5The present invention provides a low-impedance spring needle, comprising a sleeve 100, a needle head 200, and a spring member 300, all of which are conductive structures. The needle head 200 is used to contact and connect a detection target, which can be a conductive circuit of a circuit board. The sleeve 100 is provided with a limiting channel 110 running through both ends. The sleeve 100 is provided with a bottom plate 120 and a positioning ring 130 at both ends. The bottom plate 120 closes one end of the limiting channel 110, and the positioning ring 130 is fixed to the other end of the sleeve 100 to narrow the channel opening of the limiting channel 110 at that end. The bottom plate 120 is a conductive structure. The needle 200 is inserted into the positioning ring 130. The needle 200 can slide in the positioning ring 130. One end of the needle 200 is provided with a conductive slider 210 inserted into the limiting channel 110. The conductive slider 210 can slide in the limiting channel 110. The diameter of the conductive slider 210 is larger than the inner ring diameter of the positioning ring 130, which can form a reliable limiting effect and effectively prevent the needle 200 from completely separating from the positioning ring 130. The conductive slider 210 contacts the channel wall of the limiting channel 110, which can also The conductive slider 210 is set to contact the channel wall of the limiting channel 110. The conductive slider 210 is a conductive structure, which can effectively increase the contact area between the conductive slider 210 and the limiting channel 110, thereby effectively reducing the impedance between the conductive slider 210 and the sleeve 100, thereby effectively improving the signal transmission performance of the needle 200. The other end of the needle 200 is hemispherical, that is, the other end of the needle 200 is spherical, which can effectively improve the reliability of the needle 200 when detecting the connection, and can avoid the needle 200 puncturing and damaging the detection The target object is provided with a detection clearance groove 220 at the center of the needle 200 away from the conductive slider 210. By providing the inwardly recessed detection clearance groove 220 in the center of the sphere, the detection contact portion of the needle 200 can be transformed from the traditional one-dimensional point contact to the two-dimensional ring contact, which can significantly increase the contact area of ​​the needle 200, thereby effectively reducing the impedance between the needle 200 and the detection target object during the detection connection, and can effectively improve the reliability of the detection connection, meet the use requirements of high-current detection connection, with small signal attenuation and accurate and reliable signal transmission;

[0036] The conductive slider 210 is provided with a limiting groove 211 and a guide groove 212 at one end away from the needle 200. The notch of the guide groove 212 is connected to the bottom of the limiting groove 211. The width of the guide groove 212 is smaller than the width of the limiting groove 211. A guide post 140 is provided on the bottom plate 120 and is located in the limiting channel 110. The end of the guide post 140 away from the bottom plate 120 is penetrated in the guide groove 212 so that the guide post 140 can slide in the guide groove 212. The guide post 140 and the guide groove 212 can effectively improve the alignment of the sliding action of the conductive slider 210, and can effectively avoid the occurrence of problems such as jamming caused by the sliding deviation of the needle 200. The guide post 140 is a conductive structure. By setting the needle 200 to pass through the conductive slider 210, the guide post 140 and the bottom plate 120, it can also form conduction with the needle tube, which can The effective conductive area between the needle 200 and the needle tube is further increased, thereby further reducing the impedance during detection connection, which can effectively improve the detection connection conductivity of the needle 200. The spring member 300 is arranged in the limiting channel 110, and the spring member 300 is sleeved outside the guide column 140 and arranged in the limiting channel 110. The two ends of the spring member 300 are respectively connected to the bottom of the limiting groove 211 and the bottom plate 120, so that the conductive slider 210 forms a movement trend away from the bottom plate 120. The spring member 300 is a compression spring. By setting the limiting groove 211 and cooperating with the guide column 140 to limit the position of the spring member 300, the stability of the extension and contraction action of the spring member 300 can be effectively improved, and the probability of jamming during detection connection can be effectively reduced, thereby effectively improving the reliability of the spring needle detection connection action.

[0037] By setting the conductive slider 210 to directly contact the channel wall of the limiting channel 110, and setting the guide post 140 to slide in contact with the guide groove 212, the effective conductive contact area between the needle head 200 and the sleeve 100 can be effectively increased, the contact resistance is reduced, and the overall impedance of the low-impedance spring needle is effectively reduced. The low-impedance spring needle can achieve high-performance signal transmission. For example, the low-impedance spring needle can maintain lower signal attenuation in high-frequency and high-speed signal transmission, thereby improving the integrity of signal transmission and system performance. The guide post 140 cooperates with the limiting groove 211 to form a good limiting effect on the spring member 300, which can effectively ensure the alignment of the extension and contraction action of the spring member 300, thereby significantly reducing the probability of problems such as jamming and damage. The service life of the low-impedance spring pin is effectively extended, and the operation is smooth. The guide column 140 cooperates with the guide groove 212 to effectively improve the alignment of the conductive slider 210 when sliding in the limit channel 110, and can effectively improve the reliability of the movement of the low-impedance spring pin when it is extended and retracted. In addition, by providing a detection clearance groove 220 at the center of the hemispherical end of the needle 200, the detection contact part of the needle 200 can be transformed from the traditional one-dimensional point contact to a two-dimensional ring contact, which can effectively increase the contact area between the needle 200 and the detection target when the low-impedance spring pin is detecting a connection, thereby reducing the impedance between the needle 200 and the detection target at this time, further improving the signal transmission performance, and reducing the signal attenuation, which can meet the application requirements of high-frequency and high-speed signal transmission.

[0038] It can be understood that a positioning groove 213 is provided on the side wall of the circumferential surface of the conductive slider 210, and an elastic conductive block 230 is clamped in the positioning groove 213, that is, the elastic conductive block 230 is clamped and connected in the positioning groove 213, and one end of the elastic conductive block 230 protrudes from the positioning groove 213 and abuts against the inner wall of the limiting channel 110. The elastic conductive block 230 can effectively ensure the contact effect between the conductive slider 210 and the sleeve 100, thereby effectively ensuring the conductive performance during the detection connection operation, and the elastic conductive block 230 can improve the smoothness of the sliding movement of the elastic conductive slider 210, and can effectively reduce unnecessary collisions caused by problems such as high-speed rebound.

[0039] It can be understood that there are four positioning grooves 213, and the four positioning grooves 213 are evenly distributed on the four side walls of the conductive slider 210. Each positioning groove 213 is provided with an elastic conductive block 230, and one end of each elastic conductive block 230 protrudes from the positioning groove 213 and abuts against the inner wall of the limiting channel 110.

[0040] By providing four conductive sliders 210 , not only can the stability of the relative sliding movement between the conductive slider 210 and the sleeve 100 be improved from multiple directions, but the friction force can also be effectively controlled, thereby avoiding problems such as jamming caused by excessive friction force.

[0041] It can be understood that one side of the elastic conductive block 230 used to contact the inner wall of the limiting channel 110 is an arc convex surface. When four elastic conductive blocks 230 are provided, by setting the side surface of the elastic conductive block 230 as an arc convex surface for contacting the inner wall of the limiting channel 110, the contact area between the elastic conductive block 230 and the sleeve 100 can be effectively controlled, and the smooth sliding of the conductive slider 210 due to excessive friction between the elastic conductive block 230 and the inner wall of the limiting channel 110 can be further avoided, which can further ensure the smoothness of the sliding movement of the conductive slider 210.

[0042] Specifically, the elastic conductive block 230 is an elastic metal structure, such as a phosphor copper block, a beryllium copper block, or other conductive metal structure with good elasticity.

[0043] It can be understood that the detection groove 220 is a groove structure with a circular notch. By setting the detection groove 220 as a circular groove, a circular contact surface at the same plane height can be formed around the detection groove 220, which can adapt to the detection contact of most terminals.

[0044] It is understandable that the surface of the needle 200 away from the conductive slider 210 is provided with a reinforced conductive layer 201. By providing a metal with good conductive properties, the impedance can be further reduced, thereby improving the conductive performance when detecting the connection.

[0045] It is understandable that the reinforcing conductive layer 201 is a phosphor copper layer or a beryllium copper layer, which are conductive metal structures with good elastic deformation ability. The reinforcing conductive layer 201 can also be other conductive layer structures with good elasticity.

[0046] When the needle 200 contacts and squeezes the detection target, the reinforced conductive layer 201 will be squeezed and deformed under the action of pressure, thereby forming a larger contact area with the detection target, which can further reduce the impedance, thereby effectively improving the conductive performance of the detection connection, meeting the high-frequency and high-speed signal transmission requirements, and effectively improving the detection connection effect of the spring needle.

[0047] It can be understood that the low-impedance spring needle also includes an elastic washer 400, which is sleeved on the outside of the needle head 200, located between the conductive slider 210 and the positioning ring 130, and the elastic washer 400 is located in the limiting channel 110. The needle head 200 is also passed through the elastic washer 400.

[0048] After the detection connection is completed, under the action of the elastic restoring force of the spring member 300, the conductive slider 210 moves away from the base plate 120. The elastic gasket 400 can effectively absorb the collision force formed between the conductive slider 210 and the positioning ring 130, which can effectively improve the stability of the reciprocating movement of the low-impedance spring needle of the utility model.

[0049] It can be understood that the sleeve 100, the base plate 120, the positioning ring 130 and the guide column 140 are an integrally formed structure, specifically an integrated metal conductive structure made by die-casting, cutting, etc. After the conductive slider 210, the spring part 300 and other parts are installed in the limiting channel 110, the sleeve 100 is bent by riveting to obtain the positioning ring 130.

[0050] The needle 200 and the conductive slider 210 are also an integrally formed structure, specifically an integral metal conductive structure manufactured by die-casting, cutting, etc.

[0051] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A low-impedance spring pin, characterized in that: The invention comprises a sleeve (100), a needle (200) and a spring member (300), wherein a limiting channel (110) is provided in the sleeve (100), a bottom plate (120) and a positioning ring (130) are provided at both ends of the sleeve (100), the needle (200) is inserted into the positioning ring (130), one end of the needle (200) is provided with a conductive slider (210) inserted into the limiting channel (110), the conductive slider (210) contacts the channel wall of the limiting channel (110), and the other end of the needle (200) is hemispherical and has a detection groove (220) at the center; The conductive slider (210) is provided with a limiting groove (211) and a guide groove (212) at one end away from the needle head (200), and the guide groove (212) is connected to the bottom of the limiting groove (211). The bottom plate (120) is provided with a guide column (140) located in the limiting channel (110), and the end of the guide column (140) away from the bottom plate (120) is passed through the guide groove (212). The spring member (300) is provided in the limiting channel (110), and the spring member (300) is sleeved outside the guide column (140). The two ends of the spring member (300) are respectively connected to the bottom of the limiting groove (211) and the bottom plate (120), so that the conductive slider (210) forms a movement trend away from the bottom plate (120).

2. The low-impedance spring pin according to claim 1, wherein: A positioning groove (213) is provided on the side wall of the conductive sliding block (210), an elastic conductive block (230) is clamped in the positioning groove (213), and one end of the elastic conductive block (230) abuts against the inner wall of the limiting channel (110).

3. The low-impedance pogo pin according to claim 2, wherein: Four positioning grooves (213) are provided and are evenly distributed around the conductive slider (210), and one elastic conductive block (230) is provided in each positioning groove (213).

4. The low-impedance pogo pin according to claim 3, wherein: The surface of the elastic conductive block (230) that contacts the inner wall of the limiting channel (110) is an arc convex surface.

5. The low-impedance pogo pin according to claim 1, wherein: The detection and clearance groove (220) is a groove structure with a circular notch.

6. The low-impedance pogo pin according to claim 1, wherein: A reinforced conductive layer (201) is provided on the surface of the needle (200) at one end away from the conductive slider (210).

7. The low-impedance pogo pin according to claim 6, wherein: The reinforcing conductive layer (201) is a phosphor copper layer or a beryllium copper layer.

8. The low-impedance pogo pin according to claim 1, wherein: It also includes an elastic washer (400), which is sleeved outside the needle head (200) and is located between the conductive slider (210) and the positioning ring (130).

9. The low-impedance pogo pin according to claim 1, wherein: The sleeve (100), the base plate (120), the positioning ring (130) and the guide column (140) are an integrally formed structure; the needle (200) and the conductive slider (210) are an integrally formed structure.

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