Needle head structure of four-wire test ball needle

Abstract

The utility model relates to a four-wire test ball needle head structure, which comprises a needle shaft body, a contact head is coaxially arranged at the front end of the needle shaft body, and the length of the contact head is 1.0-1.4 mm; the left and right opposite side walls of the contact head are recessed to form narrowing steps, the two narrowing steps are parallel to each other, and the width of the narrowing steps is smaller than the diameter of the needle shaft body. The front end face of the contact head is an inclined face, the included angle between the inclined face and the needle shaft body is 40 degrees, and the inclined face is perpendicular to the narrowing step. Through the cooperation of the two narrowed steps and the inclined plane, the contact head on the head part of the pin shaft body is provided with an oblique-angle tip end, so that one side wall, deviating from the inclined plane, of the contact head can extend into a connector to be in contact with a golden finger of the connector, and stop type contact can be realized through the inclined plane; the two inclined surfaces can still extend into the opening of the connector and are in stopping contact with the golden fingers on the two sides in the connector, and compared with a traditional needle head structure, the structure is higher in adaptability, better in stability and more convenient to test.

Description

Technical Field

[0001] The utility model relates to the technical field of test probes, and particularly relates to a four-wire test ball needle head structure. Background Art

[0002] At present, in the connector resistance test, the four-wire method is generally adopted. Two probes are placed on both sides of the opening of the connector to form a 4-wire test loop. Among them, two probes are used to load current, and the other two probes are used to measure voltage. However, at present, the heads of the four-wire test probes are all conical structures. During the test, due to the small opening width of the connector, the juxtaposed probes cannot extend into the connector to touch the contact part with its gold fingers. Moreover, since the heads of the probes are arc-shaped, it will also lead to unstable contact and prone to problems such as sliding and offset, with poor stability and limitations in testing. Therefore, it is still necessary to adjust the structure of the existing PCB probes to make up for the aforementioned deficiencies. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a four-wire test ball needle head structure aiming at the deficiencies of the prior art, and this four-wire test ball needle head structure can well solve the above problems.

[0004] To achieve the above requirements, the technical solution adopted by the utility model to solve its technical problems is as follows:

[0005] Provide a four-wire test ball needle head structure, which includes a needle shaft body. A contact head is coaxially arranged at the front end of the needle shaft body, and the length of the contact head is between 1.0 - 1.4 mm; Narrowing steps are recessed and formed on the left and right opposite side walls of the contact head, and the two narrowing steps are parallel to each other. The width of the narrowing step is smaller than the diameter of the needle shaft body; The front end face of the contact head is an inclined plane, and the included angle between the inclined plane and the needle shaft body is 40 degrees, and the inclined plane is perpendicular to the narrowing step.

[0006] In the four-wire test ball needle head structure of the utility model, chamfers are arranged on the left and right side walls at the front end of the contact head, and the length of the chamfer along the axis direction of the needle shaft body is less than half of the length of the inclined plane along the axis direction.

[0007] In the four-wire test ball needle head structure of the utility model, the distance between the two narrowing steps is between 0.10 - 0.13 mm, the distance between the upper ends of the two chamfers is 0.06 mm, and the length of the chamfer along the axis direction is between 0.07 - 0.13 mm.

[0008] In the four-wire test ball needle head structure of the utility model, the upper end edge of the inclined plane is arched and its radian angle is 40 degrees.

[0009] The four-wire test ball needle needle head structure described in the utility model, wherein the structure also includes a ball head arranged at the tail of the needle shaft body, the center of the ball head is located on the axis of the needle shaft body, and the diameter of the ball head is larger than the diameter of the needle shaft body.

[0010] The four-wire test ball needle needle head structure described in the utility model has a length of the needle shaft body between 54.5-55.05 mm, a diameter of the needle shaft body between 0.19-0.21 mm, and a diameter of the ball head between 0.34-0.36 mm.

[0011] The beneficial effect of the utility model is that through the cooperation of the two narrowing steps and the inclined surface, the contact head on the head of the needle shaft body has an angled tip, so that the side wall of the contact head away from the inclined surface can be extended into the connector to contact its gold finger, and the inclined surface can achieve docking contact. When two needle shafts are used side by side, the two inclined surfaces can still be extended into the connector opening and dock contact with the gold fingers on both sides inside it. Compared with the structure of the traditional needle head, this structure has higher adaptability, better stability and more convenient testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0013] Figure 1 It is a front view of the needle head structure of the four-wire test ball needle of the utility model.

[0014] Figure 2 yes Figure 1 A magnified view of the local structure.

[0015] Figure 3 yes Figure 2 Side view of. DETAILED DESCRIPTION

[0016] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0017] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0018] "Multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the following will be combined with the technical solution in the embodiments of the utility model for a clear and complete description. Obviously, the described embodiments are partial embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0020] The four-wire test ball needle structure of the preferred embodiment of the utility model is as follows Figures 1-3 As shown, the structure includes a needle shaft body 10, and a contact head 20 is coaxially provided at the front end of the needle shaft body 10, and the length of the contact head 20 is between 1.0-1.4mm; narrowing steps 30 are recessed and formed on the left and right opposite side walls of the contact head 20, and the two narrowing steps 30 are parallel to each other, and the width of the narrowing step 30 is smaller than the diameter of the needle shaft body 10; the front end face of the contact head 20 is a bevel 40, and the angle A between the bevel 40 and the needle shaft body 10 is 40 degrees, and the bevel 40 is perpendicular to the narrowing step 30; through the cooperation of the two narrowing steps and the bevel, the contact head on the head of the needle shaft body has a beveled tip, so that the side wall of the contact head away from the bevel can be extended into the connector to contact its gold finger, and the docking contact can be achieved through the bevel, and when two needle shafts are used side by side, the two bevels can still be extended into the connector opening and dock contact with the gold fingers on both sides inside it. Compared with the structure of the traditional needle head, this structure has higher adaptability, better stability and more convenient testing.

[0021] In this embodiment, chamfers 50 are provided on the left and right side walls of the front end of the contact head 20, and the length of the chamfer 50 along the axial direction of the needle shaft body 10 is less than half the length of the inclined surface 40 along the axial direction, so as to further reduce the radial width of the tip of the contact head 20, so that it can further test annular holes with smaller apertures.

[0022] In this embodiment, the distance between the two narrowing steps 30 is between 0.10 - 0.13 mm, the distance between the upper ends of the two chamfers 50 is 0.06 mm, and the length of the chamfer 50 in the axial direction is between 0.07 - 0.13 mm, so as to ensure the rationality of the size of the needle shaft body 10 and ensure an appropriate structural strength.

[0023] In this embodiment, the upper edge of the inclined surface 40 is arched and its radian angle is 40 degrees, so as to avoid causing scratches during the process of contacting the upper and lower surfaces of the hole ring.

[0024] In this embodiment, the structure further includes a ball head 60 provided at the tail of the needle shaft body 10. The center of the ball head 60 is located on the axis of the needle shaft body 10, and the diameter of the ball head 60 is larger than the diameter of the needle shaft body 10, so as to facilitate fixed installation.

[0025] In this embodiment, the length of the needle shaft body 10 is between 54.5 - 55.05 mm, the diameter of the needle shaft body 10 is between 0.19 - 0.21 mm, and the diameter of the ball head is between 0.34 - 0.36 mm.

[0026] It should be understood that for those of ordinary skill in the art, improvements or changes can be made according to the above description, and all such improvements and changes should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A four-wire test ball needle structure, characterized in that: The structure includes a needle shaft body, a contact head is coaxially provided at the front end of the needle shaft body, and the length of the contact head is between 1.0-1.4mm; narrowing steps are recessed on the left and right opposite side walls of the contact head, the two narrowing steps are parallel to each other, and the width of the narrowing steps is smaller than the diameter of the needle shaft body; the front end face of the contact head is a slope, the angle between the slope and the needle shaft body is 40 degrees, and the slope is perpendicular to the narrowing step.

2. The four-wire test ball needle structure according to claim 1, characterized in that: Chamfers are provided on the left and right side walls of the front end of the contact head, and the length of the chamfers along the axial direction of the needle shaft body is less than half the length of the inclined surface along the axial direction.

3. The four-wire test ball needle structure according to claim 2, characterized in that: The spacing between the two narrowing steps is between 0.10-0.13 mm, the spacing between the upper ends of the two chamfers is 0.06 mm, and the length of the chamfers along the axial direction is between 0.07-0.13 mm.

4. The four-wire test ball needle structure according to claim 2, characterized in that: The upper edge of the inclined surface is arched and has an arc angle of 40 degrees.

5. The four-wire test ball needle structure according to claim 1, characterized in that: The structure also includes a ball head arranged at the tail of the needle shaft body, the center of the ball head is located on the axis of the needle shaft body, and the diameter of the ball head is greater than the diameter of the needle shaft body.

6. The four-wire test ball needle structure according to claim 5, characterized in that: The length of the needle shaft body is between 54.5-55.05 mm, the diameter of the needle shaft body is between 0.19-0.21 mm, and the diameter of the ball head is between 0.34-0.36 mm.

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