A microphone single unit test fixture

Abstract

The utility model discloses a microphone monomer test fixture, including base, upper cover, conductive bubble cotton, bottom frame and mesh cloth, be equipped with test probe and be used for installing the installation port of microphone monomer of waiting for testing on the base, the upper cover is located the top of base, the upper cover is used for covering the microphone monomer of waiting for testing, the conductive bubble cotton is contacted with test probe and is conducted through, one end of conductive bubble cotton is inserted into the installation port, and the conductive bubble cotton is used for the pad contact of microphone monomer of waiting for testing and is conducted through, the bottom frame is located the below of base and is detachably connected with base, the mesh cloth is pinched between the base with bottom frame, and the mesh cloth is contacted with conductive bubble cotton. The microphone monomer test fixture of this utility model is more accurate.

Description

Technical Field

[0001] This utility model relates to the field of tooling and fixture technology, and in particular to a microphone unit testing fixture. Background Technology

[0002] With the rapid popularization of AI voice interaction, MEMS microphones, as core components for sound-to-electrical conversion, are being widely patch-mounted in various terminals such as mobile phones, headphones, and speakers.

[0003] Existing production lines generally use test fixtures that allow probes to directly contact the pads. However, MEMS microphones are small in size, and the diameter of the probe head is close to or even larger than the size of the MEMS microphone pads. During testing, it is easy for the probe to slip, deviate, or be misaligned, resulting in fluctuations in contact resistance and noise interference in the signal. This causes the measured frequency response curve to deviate too much from the true value, and the repeatability and reproducibility of the test cannot meet the production line control requirements, which in turn affects the subsequent selection, classification, and consistency of shipment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a microphone testing fixture that provides more accurate test results.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a microphone unit testing fixture, comprising: A base, wherein the base is provided with test probes and mounting ports for mounting the microphone unit to be tested; A top cover, located above the base, is used to cover the microphone unit under test; Conductive foam, which is in contact with the test probe and conducts electricity; one end of the conductive foam extends into the mounting opening; the conductive foam is used to contact and conduct electricity with the solder pads of the microphone unit under test. A base frame, located below the base and detachably connected to the base; A mesh fabric is sandwiched between the base and the bottom frame, and the mesh fabric abuts against the conductive foam.

[0006] Furthermore, one end of the conductive foam has an upwardly protruding contact boss located inside the mounting opening. The contact boss is used to make contact with the pads of the microphone unit under test, and the other end of the conductive foam makes contact with the test probe.

[0007] Furthermore, the bottom frame is magnetically connected to the base.

[0008] Furthermore, the base is equipped with a magnet, and the bottom frame is made of ferromagnetic material.

[0009] Furthermore, the bottom frame has a positioning groove for positioning the mesh fabric.

[0010] Furthermore, the inner top surface of the top cover is provided with an elastic pressing member for pressing against the microphone unit under test.

[0011] Furthermore, it also includes an adapter frame, which is detachably installed at the mounting port, with one end of the conductive foam extending into the adapter frame.

[0012] Furthermore, the top cover is detachably connected to the base.

[0013] Furthermore, it also includes a connector for connecting the base.

[0014] Furthermore, it also includes an artificial mouth and a bracket for connecting the artificial mouth, with the base connected to the bracket via the connector.

[0015] The beneficial effects of this utility model are as follows: This microphone unit testing fixture has a novel structure. It forms an elastic buffer conductive layer between the test probe and the solder pad of the microphone unit through conductive foam. The multi-point micro-touch structure of the conductive foam can effectively adapt to the solder pad, avoiding the slippage, misalignment and instantaneous contact resistance fluctuations caused by direct contact of the traditional test probe. This reduces the fluctuation range of the frequency response curve test, improves the repeatability, reproducibility and accuracy of the test results. The base and the bottom frame are detachable. The mesh fabric held by the two forms a uniform back support for the conductive foam, ensuring that the conductive foam and the solder pad of the microphone unit can achieve stable contact and conduction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the microphone unit testing fixture in Example 1; Figure 2 This is an exploded view of the microphone unit testing fixture in Example 1; Figure 3 This is an exploded view of the microphone unit testing fixture of Example 1 from another perspective; Figure 4 This is a cross-sectional view of the microphone unit testing fixture in Example 1; Figure 5 This is a schematic diagram showing the usage status of the microphone unit testing fixture in Example 1; Figure 6 This is an exploded view of the microphone unit testing fixture in Example 2; Figure 7 This is an exploded view of the microphone unit testing fixture in Example 2 from another perspective; Figure 8 This is a cross-sectional view of the microphone unit testing fixture in Example 2.

[0017] Label Explanation: 1. Base; 11. Mounting port; 12. Magnet; 2. Top cover; 21. Elastic pressure-bearing component; 3. Conductive foam; 31. Contact boss; 4. Base frame; 41. Positioning groove; 5. Mesh fabric; 6. Test probe; 71. Connector; 72. Artificial mouthpiece; 73. Support frame; 8. Adapter frame; 9. Microphone unit. Detailed Implementation

[0018] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0019] Please refer to Figures 1 to 8 A microphone unit testing fixture includes a base, a top cover, conductive foam, a bottom frame, and a mesh fabric. The base has test probes and a mounting port for mounting the microphone unit to be tested. The top cover is located above the base and is used to cover the microphone unit to be tested. The conductive foam is in contact with the test probes and is electrically connected. One end of the conductive foam extends into the mounting port and is used to make contact with the pads of the microphone unit to be tested. The bottom frame is located below the base and is detachably connected to the base. The mesh fabric is sandwiched between the base and the bottom frame and abuts against the conductive foam.

[0020] As can be seen from the above description, the beneficial effects of this utility model are as follows: This microphone unit testing fixture has a novel structure. An elastic buffer conductive layer is formed between the test probe and the solder pad of the microphone unit through conductive foam. The multi-point micro-touch structure of the conductive foam can effectively adapt to the solder pad, avoiding the slippage, misalignment and instantaneous contact resistance fluctuations caused by direct contact of the traditional test probe. This reduces the fluctuation range of the frequency response curve test, improves the repeatability, reproducibility and accuracy of the test results. The base and the bottom frame are detachable. The mesh fabric held by the two forms a uniform back support for the conductive foam, ensuring that the conductive foam and the solder pad of the microphone unit can achieve stable contact and conduction.

[0021] Furthermore, one end of the conductive foam has an upwardly protruding contact boss located inside the mounting opening. The contact boss is used to make contact with the pads of the microphone unit under test, and the other end of the conductive foam makes contact with the test probe.

[0022] As described above, by forming an upward-protruding contact boss at one end of the conductive foam, the contact boss forms a soft contact point higher than the surrounding plane within the mounting opening. The soft contact point preferentially adheres to the solder pads of the microphone unit. The compression amount is predetermined by the height of the contact boss, which ensures a consistently low contact resistance while avoiding excessive compression of the conductive foam as a whole, which would lead to rebound attenuation. This extends the effective test life of the conductive foam and maintains the consistency of test results.

[0023] Furthermore, the bottom frame is magnetically connected to the base.

[0024] Furthermore, the base is equipped with a magnet, and the bottom frame is made of ferromagnetic material.

[0025] As described above, the bottom frame and base are detachably connected by magnetic attraction. The base's built-in magnet attracts the ferromagnetic bottom frame, enabling tool-free quick assembly and disassembly. When the conductive foam or mesh needs to be replaced, production line personnel can separate and reset the bottom frame within seconds, reducing equipment downtime. At the same time, the magnetic attraction ensures that the bottom frame and base are tightly attached during testing, preventing the mesh from shifting and causing uneven support of the conductive foam, further improving test stability.

[0026] Furthermore, the bottom frame has a positioning groove for positioning the mesh fabric.

[0027] As described above, the positioning groove on the bottom frame can pre-position the edge of the mesh fabric, preventing wrinkles and shifts during repeated disassembly and assembly, ensuring that the mesh fabric is always flat, providing uniform back support for the conductive foam, and thus ensuring that the testing conditions for individual microphones from different batches are the same, improving test repeatability.

[0028] Furthermore, the inner top surface of the top cover is provided with an elastic pressing member for pressing against the microphone unit under test.

[0029] As described above, when the top cover is closed, the elastic pressing component first contacts the top surface of the microphone unit and produces controllable elastic deformation, pressing the solder pads of the microphone unit against the conductive foam. This not only prevents hard contact from causing indentations on the outer shell, but also compensates for the height tolerance of the microphone unit, ensuring continuous and stable contact pressure between the solder pads and the conductive foam, and reducing contact resistance drift caused by uneven pressure.

[0030] Furthermore, it also includes an adapter frame, which is detachably installed at the mounting port, with one end of the conductive foam extending into the adapter frame.

[0031] As described above, a detachable adapter frame is added at the mounting port, and conductive foam crosses the adapter frame to connect with the microphone unit. When the product model changes, resulting in changes in the position or size of the solder pads, only the adapter frame of the corresponding size needs to be replaced for adaptation. There is no need to replace the entire base or top cover, which realizes modular sharing of the fixture and reduces the fixture development cost and line change time.

[0032] Furthermore, the top cover is detachably connected to the base.

[0033] As described above, the top cover and the base are connected by a detachable connection (such as a hinge, buckle, or magnetic attraction), which makes it convenient for production line personnel to open and close with one hand and improves the efficiency of picking up and putting down materials.

[0034] Furthermore, it also includes a connector for connecting the base.

[0035] Furthermore, it also includes an artificial mouth and a bracket for connecting the artificial mouth, with the base connected to the bracket via the connector.

[0036] As described above, the base, together with the bracket and the artificial mouth, forms a closed-loop testing system. The artificial mouth can emit standard sound pressure. The relative position of the base and the artificial mouth is rigidly fixed by the bracket, avoiding distance and angle errors caused by hand-holding or table placement. This ensures that the sound source conditions received by the microphone unit are consistent, thereby eliminating the interference of acoustic path differences on the electrical performance test results. This allows the frequency response, sensitivity, and other indicators to reflect only the characteristics of the microphone unit itself, further improving the reliability of the data.

[0037] Please refer to Figures 1 to 5 The first embodiment of this utility model is: a microphone unit testing fixture, used to assist in testing the performance of a microphone unit, especially suitable for testing MEMS microphones.

[0038] The microphone unit test fixture includes a base, a top cover, conductive foam, a bottom frame, and a mesh fabric. The base has test probes and mounting ports for mounting the microphone unit under test. The test probes are connected to an external power source. The top cover is located above the base and is used to cover the microphone unit under test. The conductive foam is in contact with the test probes and is connected. One end of the conductive foam extends into the mounting port and is used to make contact with the pads of the microphone unit under test. The bottom frame is located below the base and is detachably connected to the base. The mesh fabric is sandwiched between the base and the bottom frame, and the mesh fabric abuts against the conductive foam to prevent the conductive foam from shifting and causing it to lose stable contact with the pads of the microphone unit under test.

[0039] Specifically, one end of the conductive foam has an upwardly protruding contact boss located inside the mounting opening. The contact boss is used to make contact with the pads of the microphone unit under test, and the other end of the conductive foam makes contact with the test probe.

[0040] In one or more embodiments, the bottom frame is magnetically connected to the base. Specifically, the base is provided with a magnet, and the bottom frame is made of a ferromagnetic material; alternatively, the bottom frame is provided with a magnetic element that cooperates with the magnet, the magnetic element comprising a magnet or an iron block.

[0041] To ensure the mesh fabric remains flat and facilitates the assembly of the microphone unit testing fixture, in this embodiment, the bottom frame has a positioning groove for positioning the mesh fabric.

[0042] It is feasible for the top cover to use its own weight to press down on the microphone unit under test. Alternatively, the top cover and the base can be detachably connected, and the specific connection methods include but are not limited to threaded connection, snap-fit ​​connection, etc.

[0043] To prevent the top cover from damaging or injuring the microphone unit under test, the inner top surface of the top cover is provided with an elastic pressing component for pressing against the microphone unit under test. The elastic pressing component includes, but is not limited to, foam, rubber pads, springs, etc.

[0044] In some embodiments, the microphone unit test fixture also includes a connector that connects to the base.

[0045] The microphone unit testing fixture also includes an artificial mouth and a bracket for connecting the artificial mouth, and the base is connected to the bracket via the connector.

[0046] Please refer to Figures 6 to 8 Embodiment two of this utility model is a parallel technical solution to Embodiment one, but differs in that the microphone unit testing fixture further includes an adapter frame. The adapter frame is detachably mounted at the mounting port of the base, with one end of the conductive foam extending into the adapter frame. The adapter frame allows the microphone unit testing fixture to be used with smaller microphone units to be tested.

[0047] In practical use, after the staff installs the adapter frame, they remove the bottom frame, replace it with conductive foam that is compatible with the microphone unit to be tested, and then reinstall the bottom frame and mesh cloth. The microphone unit to be tested that is compatible with the adapter frame can then be tested.

[0048] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A microphone unit testing fixture, characterized in that, include A base, wherein the base is provided with test probes and mounting ports for mounting the microphone unit to be tested; A top cover, located above the base, is used to cover the microphone unit under test; Conductive foam, which is in contact with the test probe and conducts electricity; one end of the conductive foam extends into the mounting opening; the conductive foam is used to contact and conduct electricity with the solder pads of the microphone unit under test. A base frame, located below the base and detachably connected to the base; A mesh fabric is sandwiched between the base and the bottom frame, and the mesh fabric abuts against the conductive foam.

2. The microphone unit testing fixture according to claim 1, characterized in that, One end of the conductive foam has an upwardly protruding contact boss located inside the mounting opening. The contact boss is used to make contact with the pads of the microphone unit under test. The other end of the conductive foam makes contact with the test probe.

3. The microphone unit testing fixture according to claim 1, characterized in that, The bottom frame is magnetically connected to the base.

4. The microphone unit testing fixture according to claim 3, characterized in that, The base is equipped with a magnet, and the bottom frame is made of ferromagnetic material.

5. The microphone unit testing fixture according to claim 1, characterized in that, The bottom frame has positioning grooves for positioning the mesh fabric.

6. The microphone unit testing fixture according to claim 1, characterized in that, The inner top surface of the top cover is provided with an elastic pressing member for pressing against the microphone unit under test.

7. The microphone unit testing fixture according to claim 1, characterized in that, It also includes an adapter frame, which is detachably installed at the mounting port, with one end of the conductive foam extending into the adapter frame.

8. The microphone unit testing fixture according to claim 1, characterized in that, The top cover is detachably connected to the base.

9. The microphone unit testing fixture according to claim 1, characterized in that, It also includes a connector for connecting the base.

10. The microphone unit testing fixture according to claim 9, characterized in that, It also includes an artificial mouth and a bracket for connecting the artificial mouth, and the base is connected to the bracket through the connector.

Images