Contact device for EOL test

Abstract

The utility model discloses a contact device used for an EOL test. The contact device comprises a driving mechanism, two contact electrodes and two cables. The driving mechanism is in transmission connection with the two contact electrodes and is used for driving the two contact electrodes to move towards each other or move back to back; the opposite surfaces of the two contact electrodes are provided with contact layers, each contact layer comprises a plurality of rectangular pyramids arranged in a matrix mode, and when the driving mechanism drives the two contact electrodes to clamp an object to be detected, the rectangular pyramids abut against the object to be detected; one end of the cable is electrically connected with the contact electrode, and the other end of the cable is electrically connected with an external EOL testing device. The utility model can be adapted to objects to be measured with different sizes and shapes, and has large contact area and extremely high overload capacity. When the EOL testing device is applied to EOL testing, the universality, the accuracy and the reliability of the EOL testing can be greatly improved, and the EOL testing device can be suitable for high-current testing.

Description

Technical Field

[0001] This utility model relates to the field of EOL testing technology, and in particular to a contact device for EOL testing. Background Technology

[0002] In the manufacturing process of electronic products, end-of-line testing (EOL testing) is a critical step in ensuring product quality and performance. EOL testing covers a variety of tests, with high-current testing being particularly crucial for verifying the electrical performance and safety of products under high-load conditions. However, traditional EOL testing contact devices often have design limitations, resulting in insufficient test versatility and a limited range of applications.

[0003] First, traditional contact devices typically employ contact methods such as cylindrical wall contact, vertical single-sided horizontal contact, or double-plane screw-locking contact. While these methods ensure contact stability to some extent, they have limited contact area and are difficult to adapt to test objects of different sizes and shapes, thus reducing the versatility and applicability of the test. Second, traditional contact devices have a significant weakness in overload current capability. A single overload current is often less than 50A, which severely limits the application of EOL testing under high current conditions. With the increasing demand for high power and high current in electronic products, traditional contact devices are no longer sufficient to meet current and future testing needs. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing contact devices, such as limited contact area, poor overload current capability, and difficulty in adapting to test objects of different sizes and shapes, and to provide a contact device for EOL testing.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model provides a contact device for EOL testing, comprising: a drive mechanism, two contact electrodes, and two cables; the drive mechanism is tractively connected to the two contact electrodes and is used to drive the two contact electrodes to move towards each other or away from each other; the opposing surfaces of the two contact electrodes are provided with a contact layer, the contact layer comprising a plurality of square pyramids arranged in a matrix, and when the drive mechanism drives the two contact electrodes to clamp the test object, the square pyramids abut against the test object; one end of the cable is electrically connected to the contact electrode, and the other end is electrically connected to an external EOL testing device.

[0007] In one embodiment, the two contact electrodes are symmetrically arranged, and each contact electrode includes an electrode portion, a drive connection portion, and a cable connection portion; the electrode portion and the cable connection portion are respectively connected to both ends of the drive connection portion, the contact layer is disposed on the electrode portion, the cable connection portion is connected to the cable, and the drive connection portion is also drively connected to the drive mechanism.

[0008] In one embodiment, the contact device further includes a mounting base and a flexible connection assembly, the drive mechanism being connected to the mounting base via the flexible connection assembly.

[0009] In one embodiment, the driving mechanism includes a fixed plate and a driving member. One end of the fixed plate near the contact electrode is connected to the driving member, and the other end of the fixed plate is connected to the mounting base through the flexible connection assembly. The driving member is throttle connected to the driving connection portion.

[0010] In one embodiment, the flexible connection assembly includes an equal-height bolt and an elastic sleeve. The mounting base has a first through hole, and the fixing plate has a second through hole. The equal-height bolt extends into the first through hole and the second through hole to connect the mounting base and the fixing plate, and the elastic sleeve is fitted onto the equal-height bolt.

[0011] In one embodiment, a movable gap is provided between the fixing plate and the mounting base.

[0012] In one embodiment, an insulating protection component is provided on the outer periphery of the drive connection portion, and the insulating protection component is connected to the drive member.

[0013] In one embodiment, the electrode portion is provided with an insulating protective shell at one end near the cable connection portion.

[0014] In one embodiment, the electrode portion is vertically connected to the drive connection portion.

[0015] In one embodiment, the electrode portion, the cable connection portion, and the drive connection portion are integrally formed.

[0016] The contact device for EOL testing of this invention has the following advantages compared with the prior art: It drives two contact electrodes connected by a driving mechanism, allowing the two contact electrodes to move towards or away from each other. This makes the contact device applicable to test objects of various sizes and shapes, improving its versatility. Furthermore, the contact layer formed by a matrix arrangement of several square pyramids not only increases the contact area but also provides a more uniform and stable contact pressure, ensuring the stability of the contact. It also promotes the uniform distribution of current on the contact layer, effectively avoiding current concentration and hotspot effects, thus effectively reducing energy consumption and improving current transmission efficiency. This significantly improves the accuracy and reliability of EOL testing and also significantly enhances the overload capacity of the contact device, making it suitable for high-current testing.

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art 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.

[0019] Figure 1 A schematic diagram of the contact device for EOL testing provided by this utility model;

[0020] Figure 2 A front view of the contact device for EOL testing provided by this utility model;

[0021] Figure 3 An exploded view of the contact device for EOL testing provided by this utility model;

[0022] Figure 4 A schematic diagram of the contact electrode provided by this utility model;

[0023] Figure 5 An exploded view of the contact electrode provided by this utility model. Attached Figure Description

[0025] 1. Drive mechanism; 11. Fixing plate; 111. Second through hole; 12. Drive component; 2. Contact electrode; 21. Electrode part; 211. Contact layer; 212. Insulating protective shell; 22. Drive connection part; 23. Cable connection part; 231. Cable contact surface; 2311. Limiting part; 24. Insulating protection assembly; 241. Upper insulating protective layer; 2411. Vertical groove; 242. Lower insulating protective layer; 3. Cable; 4. Mounting base; 41. First through hole; 5. Flexible connection assembly; 51. Equal height bolt; 52. Elastic sleeve. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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.

[0029] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] 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 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0033] See Figures 1 to 5 As shown, this utility model discloses a specific embodiment of a contact device for EOL testing, including: a drive mechanism 1, two contact electrodes 2, and two cables 3; the drive mechanism 1 is connected to the two contact electrodes 2 and is used to drive the two contact electrodes 2 to move towards each other or away from each other; the opposite surfaces of the two contact electrodes 2 are provided with a contact layer 211, the contact layer 211 includes a plurality of square pyramids arranged in a matrix, when the drive mechanism 1 drives the two contact electrodes 2 to clamp the test object, the square pyramids abut against the test object; one end of the cable 3 is electrically connected to the contact electrode 2, and the other end is electrically connected to an external EOL testing device.

[0034] Specifically, the two contact electrodes 2 are driven by the drive mechanism 1 to move towards or away from each other, so that the contact device can flexibly adapt to test objects of different sizes and shapes, improving the versatility and flexibility of the test. At the same time, by providing a contact layer 211 containing several square pyramids arranged in a matrix on the opposite surface of the contact electrodes 2, the contact area is increased, and the shape of the square pyramids is conducive to providing better contact pressure and contact stability when clamping the test object, thereby ensuring the accurate transmission of test signals and improving the accuracy and reliability of EOL testing.

[0035] More specifically, this embodiment is applied to high-current testing of EOL (Effective Oxide) devices. During high-current testing, the contact layer 211, formed by a matrix arrangement of several square pyramids, allows for a more uniform distribution of current, reducing current concentration and hotspot effects. This helps reduce energy consumption, improve current transmission efficiency, and extend the lifespan of the contact electrode 2. Simultaneously, due to the increased contact area and optimized structure, the contact resistance between the contact electrode 2 and the test object is reduced, which helps improve signal acquisition sensitivity, reduce noise interference, and enhance the overall performance of the measurement contact device. The contact device provided in this embodiment achieves a contact impedance of less than 100mΩ for the contact electrode 2, enabling an overload current of 650A and application to ultra-high current testing.

[0036] In one specific embodiment, two contact electrodes 2 are symmetrically arranged. Each contact electrode 2 includes an electrode portion 21, a drive connection portion 22, and a cable connection portion 23. The electrode portion 21 and the cable connection portion 23 are respectively connected to the two ends of the drive connection portion 22. A contact layer 211 is disposed on the electrode portion 21. The cable connection portion 23 is connected to the cable 3. The drive connection portion 22 is also connected to the drive mechanism 1.

[0037] Specifically, both the electrode portion 21 and the cable connection portion 23 are perpendicularly connected to the drive connection portion 22, so that the contact electrode 2 is Z-shaped. This makes the contact electrode 2 more stable in structure while maintaining its functionality, and allows for a more compact layout, which helps save space and is suitable for testing in confined spaces. More specifically, the electrode portion 21, the cable connection portion 23, and the drive connection portion 22 are integrally molded, so that the structural strength and conductivity of the contact electrode 2 are more stable.

[0038] In one specific embodiment, the electrode portion 21 has a plate-like structure.

[0039] More specifically, the electrode portion 21 has a thickness of 5 mm, allowing it to extend into confined spaces and test the object under test within such spaces, ensuring both sufficient mechanical strength and testing accuracy. It is understood that in other embodiments, the thickness of the electrode portion 21 can be set to other parameters according to the user's requirements.

[0040] In one specific embodiment, the cable connection portion 23 has a cable contact surface 231 on the side away from the object to be tested, and the cable 3 is connected to the cable contact surface 231.

[0041] Specifically, by placing the cable contact surface 231 on the side of the cable connection portion 23 away from the object to be tested, the installation position of the cable 3 can avoid the drive connection portion 22 and the drive mechanism 1, thereby not affecting the normal drive of the drive mechanism 1, improving the overall stability of the contact device, and making the structure more compact.

[0042] More specifically, a limiting portion 2311 extends outward from the cable contact surface 231, and the cable 3 abuts against the limiting portion 2311. The design of the limiting portion 2311 enhances the connection stability between the cable 3 and the cable contact surface 231. When the drive mechanism 1 drives the contact electrode 2 to move, the limiting portion 2311 reduces the impact of vibration on the cable 3, preventing the cable 3 from loosening or falling off due to vibration, thereby ensuring the continuity and stability of signal transmission. Furthermore, the design of the limiting portion 2311 also increases the contact area between the cable 3 and the cable contact surface 231, which helps improve current distribution, reduce contact resistance, and improve signal transmission efficiency.

[0043] In one specific embodiment, the contact device for EOL testing further includes a mounting base 4 and a flexible connection component 5, with the drive mechanism 1 connected to the mounting base 4 via the flexible connection component 5.

[0044] Specifically, the flexible connection component 5 allows the drive mechanism 1 to have a certain range of motion on the mounting base 4. This makes it easier for technicians to adjust the position and angle of the drive mechanism 1 during commissioning to ensure optimal contact between the contact device and the test object, thereby improving the accuracy and reliability of the test and enabling the contact device to more flexibly adapt to different test requirements and workpiece shapes. At the same time, the flexible connection component 5 can absorb and isolate vibrations from the drive mechanism 1 or the external environment, thereby reducing the impact of these vibrations on the contact device and the test object. This helps to reduce test errors and improve test stability.

[0045] In one specific embodiment, the drive mechanism 1 includes a fixed plate 11 and a drive member 12. One end of the fixed plate 11 near the contact electrode 2 is connected to the drive member 12, and the other end of the fixed plate 11 is connected to the mounting base 4 through a flexible connection component 5. The drive member 12 is drively connected to the drive connection part 22.

[0046] Specifically, the flexible connection assembly 5 includes an equal-height bolt 51 and an elastic sleeve 52. The mounting base 4 has a first through hole 41, and the fixing plate 11 has a second through hole 111. The equal-height bolt 51 extends into the first through hole 41 and the second through hole 111 to connect the mounting base 4 and the fixing plate 11. The elastic sleeve 52 is fitted onto the equal-height bolt 51. Due to the presence of the elastic sleeve 52, a small gap exists between the equal-height bolt 51 and the first through hole 41 and the second through hole 111. This allows for a certain amount of slight horizontal displacement between the mounting base 4 and the fixing plate 11 connected by the equal-height bolt 51, effectively eliminating horizontal installation errors and motion accuracy errors between the mounting base 4 and the fixing plate 11. This ensures that the contact electrode 2 maintains good contact with the object under test, improving the accuracy and reliability of the test.

[0047] In one specific embodiment, a movable gap (not shown in the figure) is provided between the fixing plate 11 and the mounting base 4.

[0048] Specifically, the lower end of the first through hole 41 is larger than the upper end, while the second through hole 111 is the opposite, so that the upper end of the elastic component 52 is located in the first through hole 41 and abuts against the mounting base 4, and the lower end of the elastic component 52 is located in the second through hole 111 and abuts against the fixing base. Since there is a movable gap between the mounting base 4 and the fixing plate 11, there is a certain amount of movable allowance between the mounting base 4 and the fixing plate 11 in the vertical direction, which effectively disperses the stress in the vertical direction, thereby avoiding loosening or damage caused by vibration or external force.

[0049] In one specific embodiment, the elastic element 52 is a spring.

[0050] Specifically, the spring possesses stable elastic restoring force and compressive deformation capability. The spring positioned between the fixed plate 11 and the mounting base 4 ensures that they maintain a certain distance when subjected to external forces, absorbing and mitigating external impacts and vibrations. This stable elastic support helps maintain the stability and reliability of the entire structure. It is understood that in other embodiments, the elastic component 52 may also employ other solutions such as rubber components or elastic washers.

[0051] In one specific embodiment, the driving component 12 is a cylinder gripper.

[0052] Specifically, the gripper fingers of the cylinder chuck are driven to connect to the upper insulating protective layer 241 to achieve the drive connection between the drive member 12 and the drive connection part 22. This arrangement ensures that the drive member 12 can stably control the movement of the contact electrode 2 and accurately control the clamping force between the two contact electrodes 2, while ensuring the stable transmission of the test signal.

[0053] In one specific embodiment, an insulating protection component 24 is provided on the outer periphery of the drive connection portion 22, and the insulating protection component 24 is connected to the drive member 12.

[0054] Specifically, the insulation protection assembly 24 includes an upper insulation protection layer 241 and a lower insulation protection layer 242. The upper insulation protection layer 241 is provided with a vertical groove 2411. The drive connection part 22 and the cable connection part 23 are installed in the vertical groove 2411 so that the upper surface and front and rear sides of the drive connection part 22 and the front and rear sides of the cable connection part 23 are covered by the upper insulation protection layer 241. The upper end and the lower end of the upper insulation protection layer 241 are respectively connected to the drive connection part 22 and the drive member 12. The lower insulation protection layer 242 is connected to and covers the lower surface of the drive connection part 22 and the cable connection part 23. This design provides electrical isolation between the drive connection 22 and the cable connection 23 and the outside environment, effectively preventing current from accidentally leaking into the external environment or adjacent components. This reduces electrical safety risks such as electric shock and short circuits, and ensures that the drive component 12 will not experience abnormal operation or malfunction due to electrical interference during operation. This improves the stability and reliability of the entire contact device. Furthermore, it prevents the drive connection 22 and cable connection 23 from physical damage such as impact and abrasion from external objects, extending the service life of these components. In addition, the vertical groove 2411 allows the drive connection 22 and cable connection 23 to be easily installed within the upper insulating protective layer 241, which is directly connected to the drive component 12. This simplifies the installation process, improves installation efficiency, and results in a more compact and stable structure, reducing space occupation and facilitating efficient drive functionality within a limited space.

[0055] Furthermore, the connections between the upper insulating protective layer 241 and the driving component 12, as well as the connections between the driving component 12 and the fixing plate 11, all employ hollow locating pins. These hollow locating pins, as connecting components, are compact in design and occupy little space, contributing to the overall space optimization of the contact device. This design makes the connections between the upper insulating protective layer 241, the driving component 12, and the fixing plate 11 tighter, resulting in a more compact overall contact device structure. Moreover, the hollow locating pin design allows the connecting parts to withstand certain external forces and vibrations, enhancing the contact device's impact resistance. This helps reduce damage or performance degradation of the contact device caused by external forces.

[0056] In one specific embodiment, the electrode portion 21 is provided with an insulating protective shell 212 at one end near the cable connection portion 23.

[0057] Specifically, the insulating protective shell 212 covers the area of ​​the electrode part 21 other than the contact layer 211, effectively preventing electrical safety problems such as current leakage or short circuit. By reducing electrical leakage and energy loss, it helps to improve the energy efficiency of the contact device, reduce energy consumption, and reduce the failure rate of the contact device caused by electrical problems or environmental factors, thereby improving the overall reliability of the contact device.

[0058] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A contact device for EOL testing, characterized in that, include: The device comprises a drive mechanism, two contact electrodes, and two cables. The drive mechanism is connected to the two contact electrodes and is used to drive the two contact electrodes to move towards each other or away from each other. The opposing surfaces of the two contact electrodes are provided with a contact layer, which includes a plurality of square pyramids arranged in a matrix. When the drive mechanism drives the two contact electrodes to clamp the test object, the square pyramids abut against the test object. One end of the cable is electrically connected to the contact electrodes, and the other end is electrically connected to an external EOL testing device.

2. The contact device for EOL testing according to claim 1, characterized in that, The two contact electrodes are symmetrically arranged, and each contact electrode includes an electrode portion, a drive connection portion, and a cable connection portion. The electrode portion and the cable connection portion are respectively connected to the two ends of the drive connection portion. The contact layer is disposed on the electrode portion, the cable connection portion is connected to the cable, and the drive connection portion is also drively connected to the drive mechanism.

3. The contact device for EOL testing according to claim 2, characterized in that, The contact device further includes a mounting base and a flexible connection assembly, and the drive mechanism is connected to the mounting base through the flexible connection assembly.

4. The contact device for EOL testing according to claim 3, characterized in that, The driving mechanism includes a fixed plate and a driving component. One end of the fixed plate near the contact electrode is connected to the driving component, and the other end of the fixed plate is connected to the mounting base through the flexible connection assembly. The driving component is drivenly connected to the driving connection part.

5. The contact device for EOL testing according to claim 4, characterized in that, The flexible connection assembly includes an equal-height bolt and an elastic sleeve. The mounting base has a first through hole, and the fixing plate has a second through hole. The equal-height bolt extends into the first through hole and the second through hole to connect the mounting base and the fixing plate, and the elastic sleeve is fitted onto the equal-height bolt.

6. The contact device for EOL testing according to claim 4, characterized in that, A movable gap is provided between the fixing plate and the mounting base.

7. The contact device for EOL testing according to claim 4, characterized in that, An insulating protection component is provided on the outer periphery of the drive connection portion, and the insulating protection component is connected to the drive component.

8. The contact device for EOL testing according to claim 2, characterized in that, The electrode portion is provided with an insulating protective shell at one end near the cable connection portion.

9. The contact device for EOL testing according to claim 2, characterized in that, The electrode portion is vertically connected to the drive connection portion.

10. The contact device for EOL testing according to claim 2, characterized in that, The electrode part, the cable connection part, and the drive connection part are integrally formed.

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