Micro-filament stiffness measuring device

Abstract

The utility model relates to the technical field of measuring instruments, in particular to a micro-filament stiffness measuring device. The micro-filament stiffness measuring device comprises a testing platform, a positioning piece and a measuring assembly. The test platform is horizontally arranged and is used for providing support for a to-be-tested fine wire, and one end of the fine wire extends out of the test platform and naturally droops. And the positioning piece is used for positioning the part of the micro-filament on the test platform so as to ensure that the micro-filament does not tilt. And the measuring assembly is used for measuring the length and the sagging height of the micro-filament extending out of the testing platform, so that the stiffness of the micro-filament can be calculated according to a measuring structure and a formula. In conclusion, the device for measuring the stiffness of the microfilaments can be used for evaluating the stiffness performance of the microfilaments made of various materials, so that the stiffness of the microfilaments can adopt a unified measurement standard and process, and the reliability and consistency of measurement results can be improved.

Description

Technical Field

[0001] This application relates to the field of measuring instrument technology, and in particular to a device for measuring the stiffness of microfilaments. Background Technology

[0002] The stiffness of a filament is an important parameter. For example, the bonding wires in semiconductor packaging technology are filaments, and the stiffness of the bonding wires is one of the key factors to ensure packaging quality and electrical performance. Insufficient stiffness may cause the bonding wires to shift or collapse, while good stiffness can ensure that the bonding wires maintain a stable geometry during the packaging process, avoid unnecessary bending and contact, and thus ensure the reliability of electrical connections.

[0003] In the existing technology, there is no specific testing method for the stiffness of bonding wires and other fine wires. In semiconductor packaging testing, epoxy infusion test and numerical simulation are usually used to study the problems of wire collapse and skew. Although these methods can reflect the performance of bonding wires to a certain extent, they are highly complex and have poor consistency of output results, making it difficult to meet the high-efficiency testing requirements in actual production. Utility Model Content

[0004] The purpose of this invention is to provide a device for measuring the stiffness of microfilaments, so as to quickly and accurately detect the stiffness of microfilaments.

[0005] This utility model provides a device for measuring the stiffness of microfilaments, including a test platform, a positioning element, and a measuring component;

[0006] The test platform is set horizontally, and the microfilament to be tested can be placed on the test platform, with one end of the microfilament extending out of the test platform and hanging down naturally.

[0007] The positioning element is used to position the portion of the microfilament located on the test platform, and the measuring component is used to measure the length and droop height of the microfilament extending outside the test platform.

[0008] Furthermore, the test platform is provided with a guide groove, and the microfilament can be adapted to be filled into the guide groove, so that the microfilament can move along the length direction of the guide groove;

[0009] One end of the guide groove extends through the test platform along its length to form an outlet, and one end of the microfilament extends out of the test platform through the outlet.

[0010] Furthermore, the positioning element is a pressure block with a predetermined weight, the pressure block is provided with a protrusion, the pressure block is used to be placed on the guide groove, so that the protrusion extends into the guide groove and presses on the microfilament in the guide groove.

[0011] Furthermore, it also includes a bobbin mounting shaft and a guide wheel;

[0012] The axes of the spool mounting shaft and the guide wheel are both set in a horizontal direction and perpendicular to the length direction of the guide groove, and both the spool mounting shaft and the guide wheel can rotate around their own axes;

[0013] The bobbin mounting shaft is located on the side of the guide groove away from the outlet. The bobbin mounting shaft is used to coaxially connect with the bobbin wound with fine filaments. Part of the guide wheel extends into the guide groove. The fine filaments released from the bobbin can bypass the guide wheel and pass between the guide wheel and the guide groove to fill the guide groove.

[0014] Furthermore, it also includes a drive mechanism, the drive end of which is connected to the spool mounting shaft to drive the spool mounting shaft to rotate at a predetermined speed.

[0015] Furthermore, it also includes a tensioning assembly, which comprises a bracket, an elastic element, and two tensioning rollers;

[0016] The bracket is rotatably mounted via a connecting shaft. The two tensioning wheels are arranged side by side on the bracket at intervals. The axes of the connecting shaft and the two tensioning wheels are parallel to the axis of the guide wheel. The microfilament located between the spool and the guide wheel passes around the two tensioning wheels in sequence, and the two tensioning wheels are located on both sides of the microfilament.

[0017] One end of the elastic element is fixedly disposed, and the other end of the elastic element is connected to the connecting shaft to restrict the rotation of the connecting shaft.

[0018] Furthermore, the tensioning assembly also includes a torque sensor;

[0019] The torque sensor is fixedly installed, and the detection end of the torque sensor is connected to the connecting shaft.

[0020] Furthermore, it also includes a controller, and both the torque sensor and the drive mechanism are communicatively connected to the controller.

[0021] Furthermore, the measuring component includes a scale, which is disposed on the side of the test platform for the microfilament to extend out. The scale is arranged along the extension direction of the microfilament, and one end of the scale is connected to the test platform to measure the length of the microfilament located outside the test platform.

[0022] The measurement assembly also includes an optical sensor located on the side of the test platform from which the microfilament extends, for detecting the drooping height of the microfilament outside the test platform.

[0023] Furthermore, the microfilament is placed on the test platform along the length direction of the test platform, the length of the test platform is not less than 500mm, the width of the test platform is not less than 200mm, and the height of the test platform is not less than 150mm.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] The microfilament stiffness measuring device provided by this utility model includes a testing platform, a positioning element, and a measuring component. The testing platform is horizontally positioned so that the microfilament to be measured can be placed on it, providing horizontal support. One end of the microfilament extends beyond the testing platform and hangs naturally. The positioning element is positioned on the testing platform to ensure that the portion of the microfilament on the platform does not warp when one end extends beyond it. The measuring component measures the length and droop height of the microfilament extending beyond the testing platform, thereby calculating the stiffness of the microfilament according to a formula based on the measuring structure.

[0026] In summary, this application provides a device for measuring the stiffness of microfilaments, which can be used to evaluate the stiffness properties of microfilaments made of various materials (such as gold, silver, copper, aluminum and their alloys). This allows for the use of a unified measurement standard and procedure for microfilament stiffness, which helps improve the reliability and consistency of measurement results, facilitates comparisons between different laboratories, and provides strong support for the quality control and R&D of related products using microfilaments. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the structure of the microfilament stiffness measuring device provided in this embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram showing the length and sag height measured by the microfilament stiffness measuring device provided in this embodiment of the utility model.

[0030] Figure label:

[0031] 1-Test platform, 2-Guide groove, 3-Pressure block, 4-Scale, 5-Spool, 6-Tensioning assembly, 7-Guide wheel, 8-Optical sensor, 9-Controller, 10-Micro filament. Detailed Implementation

[0032] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0033] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0034] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 do not 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] The following reference Figure 1 and Figure 2 This application describes a microfilament stiffness measuring device according to some embodiments.

[0038] This application provides a device for measuring the stiffness of microfilaments, such as... Figure 1As shown, the microfilament stiffness measuring device includes a test platform 1, a positioning element, and a measuring component.

[0039] The test platform 1 is set horizontally. When measuring the stiffness of the microfilament 10, the microfilament 10 to be tested can be placed on the test platform 1 so that the test platform 1 can provide horizontal support for the microfilament 10 to be tested, and one end of the microfilament 10 in the length direction extends out of the test platform 1 and hangs down naturally.

[0040] The positioning element (i.e., the pressure block 3 in the following text) is set on the test platform 1. The positioning element is used to position the part of the microfilament 10 located on the test platform 1 so as to ensure that when one end of the microfilament 10 extends out of the test platform 1 and hangs down naturally, the part of the microfilament 10 located on the test platform 1 will not lift up.

[0041] The measuring component is used to measure the length and sag height of the microfilament 10 extending beyond the test platform 1; specifically, such as... Figure 2 As shown, during the measurement process, one end of the microfilament 10 is clamped, and the microfilament 10 is pulled horizontally out of the test platform 1 along its length. The measurement component is used to measure the length L of the microfilament 10 pulled out of the test platform 1. Then, the clamped end of the microfilament 10 is released, allowing the portion of the microfilament 10 extending outside the test platform 1 to fall naturally. The measurement component is used to measure the falling height H of the end of the microfilament 10 outside the test platform 1. The above process is repeated to obtain multiple sets of lengths L and sag heights H. The average value of the ratio of multiple sets of L and H is then calculated to obtain the stiffness T of the measured microfilament 10. For example, if the same microfilament 10 is measured three times to obtain three sets of lengths L and corresponding sag heights H, and the first set of lengths and sag heights is denoted as L1 and H1, the second set as L2 and H2, and the third set as L3 and H3, then the stiffness of the microfilament 10 is...

[0042]

[0043] In addition, it is recommended to select a length L such that the angle θ between the end of the microfilament 10 bending and drooping under its own weight and the platform is between 15° and 60°.

[0044] In summary, this application provides a device for measuring the stiffness of microfilaments 10, which can be used to evaluate the stiffness performance of microfilaments 10 of various materials (such as gold, silver, copper, aluminum and their alloys). This allows for the use of a unified measurement standard and procedure for the stiffness of microfilaments 10, which helps to improve the reliability and consistency of measurement results, facilitates comparison between different laboratories, and provides strong support for the quality control and R&D of related products using microfilaments 10.

[0045] In one embodiment of this application, preferably, the positioning element is a pressure block 3 with a predetermined weight. After the position of the microfilament 10 on the test platform 1 is adjusted, that is, after the length of the microfilament 10 extending outside the test platform 1 meets the requirements, the pressure block 3 can press on the microfilament 10 on the test platform 1, so as to use the pressure block 3 to position the microfilament 10 and prevent the microfilament 10 on the test platform 1 from tilting upward or moving during subsequent measurement.

[0046] In this embodiment, preferably, the weight of the pressure block 3 is not less than 20g, so that the pressure block 3 can provide sufficient pressure to the microfilaments 10 on the test platform 1, ensuring that the microfilaments 10 on the test platform 1 will not lift up or move.

[0047] In one embodiment of this application, preferably, the upper surface of the test platform 1, which supports the microfilament 10, is provided with a guide groove 2. The guide groove 2 is a long, straight groove extending along a linear direction. The microfilament 10 to be tested can be loaded into the guide groove 2 along its length, and one end of the guide groove 2 extends through the test platform 1 to form an outlet for one end of the microfilament 10 to extend out of the test platform 1. Through this outlet, the microfilament 10 can be pulled outward, so that one end of the microfilament 10 extends out of the test platform 1 by a predetermined length and hangs down naturally. The guide groove 2 is used to limit and guide the microfilament 10, so that the microfilament 10 remains straight and does not deviate during the process of being pulled outward.

[0048] In this embodiment, the pressure block 3 used as a positioning element is provided with a protrusion. The pressure block 3 can be pressed onto the guide groove 2, so that the protrusion extends into the guide groove 2 and presses on the microfilament 10 in the guide groove 2, so as to provide pressure for the microfilament 10. After the extension length is adjusted, the microfilament 10 can be fixed in the guide groove 2 of the test platform 1, ensuring that it will not tilt or move during subsequent measurement.

[0049] During the actual measurement process, the pressure block 3 is positioned on the test platform 1 close to the side where the cable outlet is located, for example, in Figure 1 In the middle, the right side of the test platform 1 forms an outlet for the microfilament 10 to extend out, and the pressure block 3 is also set on the right side of the test platform 1.

[0050] In one embodiment of this application, preferably, the microfilament stiffness measuring device further includes a spool mounting shaft and a guide wheel 7. Both the spool mounting shaft and the guide wheel 7 are located above the test platform 1, and both can rotate around their own axes. Both axes are horizontally aligned and perpendicular to the length direction of the guide groove 2. The microfilament 10 to be tested is wound on a spool 5, which is coaxially mounted on the spool mounting shaft to assist in the release of the spool 5. The guide wheel 7 is positioned opposite the guide groove 2, with one end extending into the guide groove 2 and spaced a predetermined distance from the bottom wall of the guide groove 2. The microfilament 10 released from the spool 5 can pass around the guide wheel 7 from the side of the guide wheel 7 away from the guide groove 2's outlet, and pass between the guide wheel 7 and the guide groove 2 to fill the guide groove 2. Thus, the guide wheel 7 guides the microfilament 10 into the guide groove 2.

[0051] In this embodiment, preferably, the microfilament stiffness measuring device further includes a driving mechanism, the driving end of which is connected to the bobbin mounting shaft to drive the bobbin mounting shaft to rotate at a predetermined speed, thereby giving the bobbin 5 a suitable unwinding speed.

[0052] In a preferred embodiment of this application, the microfilament stiffness measuring device further includes a tensioning component 6, which is disposed between the bobbin mounting shaft and the guide wheel 7, such that the microfilament 10 released from the bobbin 5 first passes around the tensioning component 6 before reaching the guide wheel 7.

[0053] The tensioning assembly 6 includes a bracket, an elastic element, and two tensioning rollers. The bracket is rotatably mounted via a connecting shaft, allowing it to rotate around the axis of the connecting shaft. One end of the elastic element is fixed, while the other end rotates with the connecting shaft. When the connecting shaft is subjected to force and rotates, the elastic force of the elastic element acts on the connecting shaft to resist its rotation. The two tensioning rollers are arranged side-by-side on the bracket, each capable of rotating around its own axis. The axes of the two tensioning rollers and the axis of the connecting shaft are parallel to the axis of the guide roller 7. The microfilament 10, located between the spool 5 and the guide roller 7, passes sequentially around the two tensioning rollers, with the two tensioning rollers positioned on either side of the microfilament 10.

[0054] When the support of the tensioning assembly 6 is not subjected to external force, it has an initial position, at which time the elastic element does not undergo elastic deformation. When the free end of the microfilament 10 is clamped and the microfilament 10 is pulled to the outside of the test platform 1, due to the pulling of the microfilament 10, the support will drive the two tensioning wheels to rotate to deviate from the initial position, and the elastic element will undergo elastic deformation to resist the rotation of the support, thereby using the two tensioning wheels to provide tension for the passing microfilament 10.

[0055] In this embodiment, preferably, the tensioning assembly 6 further includes a torque sensor, which is fixedly installed and its drive end is connected to the connecting shaft to detect the tension force provided by the tensioning assembly to the microfilament 10.

[0056] In this embodiment, preferably, the microfilament stiffness measuring device further includes a controller 9, and the torque sensor and the drive mechanism for driving the spool 5 to rotate are all communicatively connected to the controller 9; when the microfilament 10 is pulled outward to the test platform 1, the torque sensor can detect the tension force on the microfilament and upload it to the controller 9, and then the controller 9 controls the drive mechanism to control the rotation speed of the spool 5, thereby realizing the control of the wire feeding rate of the spool 5.

[0057] In one embodiment of this application, preferably, the measuring component includes a scale 4, which is disposed on the side of the test platform 1 where the microfilament 10 extends. One end of the scale 4 is connected to the side wall of the test platform 1, and the length direction of the scale 4 extends along the direction in which the microfilament 10 is pulled out. For example, the microfilament 10 is pulled out from the aforementioned outlet along the length direction of the guide groove 2. The scale 4 is disposed adjacent to the outlet, and the length direction of the scale 4 is disposed along the length direction of the guide groove 2, so that the length of the microfilament 10 pulled out of the test platform 1 can be measured using the scale 4.

[0058] The drooping height of the end of the microfilament 10 extending beyond the test platform 1 can also be measured using another scale 4; alternatively, an existing optical sensor 8 can be used, with the optical sensor 8 positioned at a distance from the side of the test platform 1 where the microfilament 10 extends, to measure the drooping height of the end of the microfilament 10 extending beyond the test platform 1. For example, the optical sensor 8 can be a CCD imaging sensor, capable of imaging the naturally drooping microfilament, and then calculating the drooping height based on the acquired image.

[0059] In this embodiment, preferably, the optical sensor 8 is communicatively connected to the controller 9. The controller 9 can input the length L of the microfilament 10 being pulled out during three measurements, and the controller 9 can receive the measurement data from the optical sensor 8, namely the drooping height H of the microfilament 10, and calculate the stiffness of the microfilament 10 according to the formula.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A microfilament stiffness measuring device characterized by, The device comprises a testing platform, a positioning member and a measuring assembly; The testing platform is horizontally arranged, and the microfilament to be tested can be placed on the testing platform, with one end of the microfilament extending out of the testing platform and naturally sagging; The positioning member is used for positioning the part of the microfilament on the testing platform, and the measuring assembly is used for measuring the length and sag height of the microfilament extending out of the testing platform.

2. The microfilament stiffness measuring device of claim 1, wherein, The testing platform is provided with a guide groove, and the microfilament can be fitted into the guide groove, so that the microfilament can move along the length direction of the guide groove; One end of the guide groove penetrates through the testing platform to form a wire outlet, and one end of the microfilament extends out of the testing platform through the wire outlet.

3. The microfilament stiffness measuring device of claim 2, wherein, The positioning member is a pressing block with a predetermined weight, and the pressing block is provided with a protrusion, and the pressing block is used for being placed on the guide groove, so that the protrusion extends into the guide groove and presses on the microfilament in the guide groove.

4. The microfilament stiffness measuring device of claim 2, wherein, Further comprising a spool mounting shaft and a guide wheel; The axis directions of the spool mounting shaft and the guide wheel are both arranged along the horizontal direction and are perpendicular to the length direction of the guide groove, and the spool mounting shaft and the guide wheel can rotate around their own axes; The spool mounting shaft is arranged on the side of the guide groove away from the wire outlet, and the spool mounting shaft is used for being coaxially connected with a spool on which the microfilament is wound, and part of the guide wheel extends into the guide groove, and the microfilament unwound from the spool can pass around the guide wheel and between the guide wheel and the guide groove to be fitted into the guide groove.

5. The microfilament stiffness measuring device of claim 4, wherein, Further comprising a driving mechanism, and a driving end of the driving mechanism is connected with the spool mounting shaft to drive the spool mounting shaft to rotate.

6. The microfilament stiffness measuring device of claim 5, wherein, Further comprising a tensioning assembly, and the tensioning assembly comprises a bracket, an elastic member and two tensioning wheels; The bracket is rotationally arranged through a connecting shaft, and the two tensioning wheels are arranged side by side and spaced apart on the bracket, the axis of the connecting shaft and the axes of the two tensioning wheels are parallel to the axis of the guide wheel, and the microfilament between the spool and the guide wheel passes around the two tensioning wheels in sequence, and the two tensioning wheels are located on the two sides of the microfilament; One end of the elastic member is fixedly arranged, and the other end of the elastic member is connected with the connecting shaft to limit the rotation of the connecting shaft.

7. The microfilament stiffness measuring device of claim 6, wherein, The tensioning assembly further comprises a torque sensor; The torque sensor is fixedly arranged, and a detection end of the torque sensor is connected with the connecting shaft.

8. The microfilament stiffness measuring device of claim 7, wherein, Further comprising a controller, and the torque sensor and the driving mechanism are both communicatively connected with the controller.

9. The microfilament stiffness measuring device of claim 1, wherein, The measuring assembly comprises a scale, and the scale is arranged on the side of the testing platform where the microfilament extends out, and the scale is arranged along the extension direction of the microfilament, and one end of the scale is connected with the testing platform, so that the length of the microfilament extending out of the testing platform is measured by using the scale; The measuring assembly further comprises an optical sensor, and the optical sensor is arranged on the side of the testing platform where the microfilament extends out, so as to detect the sag height of the microfilament extending out of the testing platform.

10. The microfilament stiffness measuring device of claim 1, wherein, The microfilaments are placed on the test platform along the length direction of the test platform, the length of the test platform is not less than 500 mm, the width of the test platform is not less than 200 mm, and the height of the test platform is not less than 150 mm.

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