A microphone testing device

Abstract

The utility model provides a microphone testing arrangement, it includes test platform, standard microphone, first loudspeaker, briquetting, second loudspeaker and controller, test platform is used for the microphone of waiting for measuring to place, in the utility model, the sound of different frequency is sent through first loudspeaker, and then the sound data of standard microphone and the microphone of waiting for measuring are received by controller, and then the yield of the recording module of the microphone of waiting for measuring is judged, the sealed chamber is set up on briquetting, briquetting is inserted into the test area and is abutted the microphone of waiting for measuring, the recording module of the microphone of waiting for measuring is sealed in sealed chamber, second loudspeaker starts to make a sound under the control of controller, at this moment, the sound source signal of the microphone of waiting for measuring can be received by controller, and whether the sound source air tightness of microphone is good is discriminated, so whether the microphone of waiting for measuring is qualified is judged.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment, and in particular to a microphone testing device. Background Technology

[0002] To meet the demands of large-scale MEMS microphone applications, their packaging systems face a dual technical challenge: ensuring the physical reliability of the micromechanical structure while precisely maintaining the acoustic stability of the acoustic channel. Defects in packaging integrity will trigger a dual destructive mechanism from environmental contaminants (dust particle intrusion, moisture penetration, etc.), leading to transducer sensitivity degradation or even mechanical failure.

[0003] Patent application number 201920740800.5 discloses a microphone multi-band clock frequency response testing device, which includes a controller, a base box, a fixed housing, a test platform, a clamping part, a standard microphone, a transmitter, and a shielding cover. The fixed housing is disposed inside the base box, and the test platform is connected to the base box. The test platform is provided with test terminals and through holes. The clamping part is movably disposed above the test platform for pressing electrical terminals to electrically connect with the test terminals. The standard microphone and transmitter are disposed inside the fixed housing. However, this testing device uses a large shielding cover for sealing. The contact surface between the fixed cover and the movable cover in the shielding cover is large, increasing the sealing difficulty and resulting in low detection capability and accuracy. Therefore, there is a need to provide a microphone testing device to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides a microphone testing device to solve the problems of sealing difficulties and low detection capability and accuracy in existing microphone testing devices.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a microphone testing device for detecting the sound recording data of a microphone under test, wherein the microphone under test has a recording module and electrical terminals, including:

[0006] The test platform includes a test area for placing and testing a microphone under test. The test area has a first through hole, and the test platform has a first mounting slot and a second mounting slot. The test platform also has a connecting channel that connects the first through hole, the first mounting slot, and the second mounting slot. The first through hole corresponds to the recording module.

[0007] A standard microphone is installed in the first mounting slot;

[0008] The first speaker is installed in the second mounting slot;

[0009] A pressure block is disposed above the test platform. The pressure block has a sealed chamber with an open lower end, and a sealing ring is provided at the open end of the sealed chamber.

[0010] The second horn is installed inside the sealed cavity;

[0011] The controller is electrically connected to the microphone under test, the standard microphone, the first speaker, and the second speaker. The controller is used to compare the signals received by the microphone under test and the standard microphone after receiving sound emitted by the first speaker for testing, and to analyze the signal received by the microphone under test after receiving sound emitted by the second speaker.

[0012] The microphone testing device has at least a testing state. When the microphone testing device is in the testing state, one end of the pressure block extends into the testing area and abuts against the microphone under test, and the sealing ring wraps around and connects to the outside of the recording module.

[0013] The microphone testing device described in this utility model also includes:

[0014] The test platform is slidably connected to the base.

[0015] A lifting assembly is mounted on the base and connected to the pressure block. The lifting assembly is used to drive the pressure block to move up and down relative to the test platform.

[0016] The microphone testing device also has an open state. When the microphone testing device is in the open state, the pressure block and the testing platform are spaced apart.

[0017] The testing platform has a testing position and a loading position. When the testing platform is in the loading position, it is away from the lifting component; when the testing platform is in the testing position, it is close to the lifting component.

[0018] In the microphone testing device of this utility model, an adapter plate is provided on the testing platform. The adapter plate is electrically connected to the controller. The adapter plate is provided with a pin header for connecting the electrical terminals of the microphone under test. The lifting assembly is connected to a pressure head. When the microphone testing device is in the testing state, the pressure head presses the electrical terminals of the microphone under test onto the pin header.

[0019] In the microphone testing device of this utility model, the lifting assembly includes a lifting bracket and a lifting cylinder. The lifting bracket is installed on the base, and the lifting cylinder is installed on the lifting bracket. A first sensor and a second sensor are provided on the lifting bracket. The output end of the lifting cylinder is connected to a first sensing plate. The first sensor and the second sensor are located on the movement trajectory of the first sensing plate, and the first sensor is located below the second sensor.

[0020] When the microphone testing device is in testing mode, the first sensing sheet moves to the first sensor.

[0021] In the microphone testing device of this utility model, a plug is protruding on the side of the testing platform near the lifting component, and a blocking block is provided on the base to limit the movement range of the testing platform. The blocking block is provided with a clamping groove for the plug to extend into, and a positioning bead for abutting the plug is provided in the clamping groove.

[0022] When the test platform is in the loading position, the insert block moves away from the blocking block; when the test platform is in the testing position, the insert block extends into the clamping groove, and the positioning bead abuts against the insert block.

[0023] In the microphone testing device of this utility model, a third sensor is provided on the base, a second sensing plate is provided on the testing platform, and the third sensor is located on the movement trajectory of the second sensing plate.

[0024] When the test platform is in the test position, the second sensing element moves to the position of the third sensor; when the test platform is in the loading position, the second sensing element moves away from the third sensor.

[0025] In the microphone testing device of this utility model, a guide rail is provided on the base, and a slider is connected below the testing platform, with the slider slidably connected to the guide rail.

[0026] In the microphone testing device of this utility model, a sealing gasket for placing the microphone under test is provided in the testing area, and a connecting hole communicating with the first through hole is provided on the sealing gasket.

[0027] In the microphone testing device of this utility model, a guide post is provided below the pressure block, and a guide hole is provided on the testing platform for the guide post to extend into.

[0028] In the microphone testing device of this utility model, the connection channel includes a relay cavity and a second through hole. The relay cavity connects the first mounting slot and the first through hole, and the second through hole connects the relay cavity and the second mounting slot.

[0029] Compared with the prior art, the advantages of this utility model are as follows: In the microphone testing device of this utility model, different frequencies of sound are emitted through the first speaker, and the controller compares the sound data received by the microphone under test and the standard microphone to determine the yield of the recording module under test, thereby improving the quality of the product and solving the problem of defective products flowing out due to imperfect testing in the mass production process, and solving the problem of high misjudgment in product testing; both the microphone under test and the standard microphone are connected to the second mounting slot through the connection channel, thereby ensuring the consistency of the sound data before recording and improving the accuracy of the test.

[0030] A sealed chamber is set on the pressure block, which extends into the test area and abuts against the microphone under test. The recording module of the microphone under test is sealed within the sealed chamber. The second speaker starts to emit sound under the control of the controller. At this time, the controller can receive the sound source signal emitted by the microphone under test and determine whether the sound source airtightness of the microphone is good, thus determining whether the microphone under test is qualified. This testing device has a simple structure, a small sealed chamber space, low sealing difficulty, low cost, and high detection capability and accuracy. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of this utility model.

[0032] Figure 1 This is a schematic diagram of the microphone testing device of this utility model. Figure 1 .

[0033] Figure 2 This is a cross-sectional view of the microphone testing device of this utility model.

[0034] Figure 3 for Figure 2 A magnified view of A in the middle.

[0035] Figure 4 This is a schematic diagram of the microphone testing device of this utility model. Figure 2 .

[0036] Figure 5 This is a cross-sectional view of the test platform of the microphone testing device of this utility model.

[0037] Figure 6This is a schematic diagram of the test platform of the microphone testing device of this utility model.

[0038] Figure 7 This is a schematic diagram of the pressure block of the microphone testing device of this utility model.

[0039] Figure 8 This is a schematic diagram of the microphone under test.

[0040] Figure 9 This is a schematic diagram of the hidden defects in the connection between the microphone element and the flexible circuit board, such as poor adhesive wetting and solder micropores.

[0041] The following are the labeling elements in the figure:

[0042] 1. Test platform; 11. First through hole; 12. Connection channel; 121. Transmission cavity; 122. Second through hole; 13. First mounting slot; 131. Standard microphone; 14. Second mounting slot; 141. First speaker; 15. Adapter board; 151. Pin header; 16. Insert block; 17. Second sensor plate; 18. Sealing gasket; 19. Guide hole;

[0043] 2. Pressure block; 21. Sealed chamber; 22. Sealing ring; 23. Second horn; 24. Guide post;

[0044] 3. Base; 31. Blocking block; 311. Grip groove; 32. Third sensor; 33. Guide rail; 331. Slider;

[0045] 4. Lifting assembly; 41. Lifting bracket; 411. First sensor; 412. Second sensor; 42. Lifting cylinder; 421. Pressure head; 422. First sensing element;

[0046] 5. Microphone under test; 51. Recording module; 52. Electrical terminals. Detailed Implementation

[0047] 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.

[0048] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this utility model, and are not intended to limit this utility model.

[0049] The terms "first" and "second" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as a restriction on the order of events.

[0050] 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 fixed 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.

[0051] Existing technologies use large shielding box covers for sealing, resulting in a large contact area between the fixed and movable covers, which increases the difficulty of sealing. Therefore, there is a need to provide a microphone testing device to solve the above-mentioned technical problems.

[0052] The following is a microphone testing device provided by this utility model that can solve the above-mentioned technical problems.

[0053] See Figure 8 The microphone under test 5 has a recording module 51 and an electrical terminal 52. The recording module 51 is used for recording, and the electrical terminal 52 is used for connecting the microphone to other devices to transmit signals.

[0054] MEMS silicon microphones consist of core components such as a metal housing, MEMS sensor chip, backplate, diaphragm, and acoustic port. During the semi-finished product assembly stage, individual microphone components are integrated onto a flexible circuit board using surface mount technology (SMT). Please refer to [link / reference]. Figure 9 The connection between the microphone component and the flexible circuit board may have subtle, hidden defects such as poor adhesive wetting and solder micropores. The microphone testing device in this embodiment can focus on detecting the impact of the soldering process on the acoustic sealing performance of the audio component, which plays a decisive role in the product's acoustic characteristics.

[0055] Traditional acoustic seal testing methods use a dedicated diaphragm-sealed microphone aperture for testing, which has the following technical limitations:

[0056] Process fluctuation interference: The thickness tolerance of the protective film (±0.05mm) and the positioning deviation of the manual application process (>0.3mm) result in a test data dispersion of 15-20dB.

[0057] Insufficient detection sensitivity: The background noise in the open test field (>35dB(A)) causes the signal-to-noise ratio to deteriorate, and the current solution can only identify obvious defects with a phase break of 15°-20°.

[0058] Significant risk of missed detection: There are no effective means to detect minute sealing failures and gradual defects with a temperature of less than 10°, and the theoretical missed detection rate of defective products is as high as 18.7%.

[0059] In the diagram, units with similar structures are represented by the same labels.

[0060] See Figure 1 , Figure 2 and Figure 3 This utility model provides a microphone testing device, including a testing platform 1, a standard microphone 131, a first speaker 141, a pressure block 2, a second speaker 23, and a controller. The testing platform 1 has a testing area for placing and testing the microphone 5 under test, and a first through hole 11 is provided in the testing area. (See reference...) Figure 5 The test platform 1 is provided with a first mounting slot 13 and a second mounting slot 14. A connecting channel 12 is provided within the test platform 1, connecting a first through hole 11, the first mounting slot 13, and the second mounting slot 14. The first through hole 11 corresponds to the recording module 51. A standard microphone 131 is installed in the first mounting slot 13, and a first speaker 141 is installed in the second mounting slot 14. A pressure block 2 is located above the test platform 1. The pressure block 2 has a sealed chamber 21 with an open lower end. A sealing ring 22 is provided at the open end of the sealed chamber 21, and a second speaker 23 is installed within the sealed chamber 21.

[0061] The controller is electrically connected to the microphone under test (DUT) 5, the standard microphone 131, the first speaker 141, and the second speaker 23. The controller is used to compare the signals received by the DUT and the standard microphone 131 after receiving sound from the first speaker 141, and to analyze the signal received by the DUT from the second speaker 23. The controller can refer to a computer integrating a central controller, memory, motherboard, and various data interfaces. Test data can be viewed through an external display screen. The controller can be electrically connected to the DUT 5, standard microphone 131, first speaker 141, and second speaker 23 via an adapter circuit.

[0062] The microphone testing device has at least a testing state. When the microphone testing device is in the testing state, one end of the pressure block 2 extends into the testing area and abuts against the microphone 5 under test. The sealing ring 22 is wrapped around and connected to the outside of the recording module 51.

[0063] In this microphone testing device, different frequencies of sound are emitted by the first speaker 141, and the controller compares the sound data received by the microphone under test 5 and the standard microphone 131 to determine the yield of the recording module 51 under test. This improves product quality, solves the problem of defective products flowing out due to imperfect testing during mass production, and solves the problem of high misjudgment in product testing. Both the microphone under test 5 and the standard microphone 131 are connected to the second mounting slot 14 through the connection channel 12, thereby ensuring the consistency of sound data before recording and improving the accuracy of testing.

[0064] A sealed chamber 21 is provided on the pressure block 2. The pressure block 2 extends into the test area and abuts against the microphone 5 under test. The recording module 51 of the microphone 5 under test is sealed inside the sealed chamber 21. The second speaker 23 starts to emit sound under the control of the controller. At this time, the controller can receive the sound source signal emitted by the microphone 5 under test and determine whether the sound source airtightness of the microphone is good. In this way, the quality of the microphone 5 under test can be determined. This test device has a simple structure, the sealed chamber 21 has a small space, the sealing is easy, and the cost is low.

[0065] In some embodiments, see Figure 1 , Figure 2 and Figure 4 The microphone testing device also includes a base 3 and a lifting assembly 4, with the testing platform 1 slidably connected to the base 3. The lifting assembly 4 is mounted on the base 3 and connected to the pressure block 2. The lifting assembly 4 is used to move the pressure block 2 up and down relative to the testing platform 1. The microphone testing device also has an open state, in which the pressure block 2 is spaced apart from the testing platform 1 when the microphone testing device is in the open state.

[0066] Test platform 1 has a testing position and a loading position. When test platform 1 is in the loading position, it is away from the lifting component 4. At this time, the pressure block 2 is offset from test platform 1, making it convenient to place the microphone under test 5 in the testing area. When test platform 1 is in the testing position, it is close to the lifting component 4. After the microphone under test 5 is loaded, test platform 1 is manually pushed close to the lifting component 4. Test platform 1 moves under pressure block 2, and the lifting component 4 drives pressure block 2 to descend. Pressure block 2 touches the microphone under test 5, and the test begins.

[0067] In some embodiments, see Figure 1 , Figure 4 and Figure 6The test platform 1 is equipped with an adapter plate 15, which is electrically connected to the controller. The adapter plate 15 has a pin header 151 on it, allowing the electrical terminals 52 of the microphone under test 5 to connect to the pin header 151. The lifting assembly 4 is connected to a pressure head 421. When the microphone testing device is in test mode, the pressure head 421 presses the electrical terminals 52 of the microphone under test 5 onto the pin header 151. During testing, the pressure head 421 securely presses the electrical terminals 52 of the microphone under test 5 onto the pin header 151, preventing the electrical terminals 52 from falling off during testing and ensuring smooth testing.

[0068] In some embodiments, see Figure 1 and Figure 4 The lifting assembly 4 includes a lifting bracket 41 and a lifting cylinder 42. The lifting bracket 41 is mounted on the base 3, and the lifting cylinder 42 is mounted on the lifting bracket 41. A first sensor 411 and a second sensor 412 are disposed on the lifting bracket 41. The output end of the lifting cylinder 42 is connected to a first sensing element 422. The first sensor 411 and the second sensor 412 are located on the moving trajectory of the first sensing element 422, with the first sensor 411 positioned below the second sensor 412. When the microphone testing device is in testing mode, the first sensing element 422 moves to the position of the first sensor 411.

[0069] The first sensor 411 and the second sensor 412 can be slotted photoelectric sensors. The first sensor 411 and the second sensor 412 monitor the movement of the lifting cylinder 42 in real time and control the lifting cylinder 42 to drive the pressure block 2 to rise or fall.

[0070] In some embodiments, see Figure 1 and Figure 4 A protruding insert 16 is provided on the test platform 1 near the lifting component 4, and a blocking block 31 is provided on the base 3. The blocking block 31 is used to limit the movement range of the test platform 1. The blocking block 31 is provided with a clamping groove 311, into which the insert 16 can extend. A positioning bead is provided in the clamping groove 311. The positioning bead is elastic and can elastically clamp the insert 16.

[0071] When the test platform 1 is in the loading position, the insert block 16 moves away from the blocking block 31; when the test platform 1 is in the testing position, the insert block 16 extends into the clamping groove 311, and the positioning bead abuts against the insert block 16. The test platform 1 slides on the base 3, and the blocking block 31 limits the movement range of the test platform 1. The positioning bead in the clamping groove 311 elastically clamps the insert block 16, making it less likely for the test platform 1 to shake after moving to the testing position.

[0072] In some embodiments, see Figure 1 and Figure 4A third sensor 32 is installed on the base 3, and a second sensing element 17 is installed on the test platform 1. The third sensor 32 is located on the moving trajectory of the second sensing element 17. When the test platform 1 is at the test position, the second sensing element 17 moves to the position of the third sensor 32; when the test platform 1 is at the loading position, the second sensing element 17 moves away from the third sensor 32. By setting the third sensor 32 and the second sensing element 17, the second sensor 412 can detect when the test platform 1 reaches the test position, ensuring that the test can proceed normally.

[0073] In some embodiments, see Figure 1 and Figure 4 The base 3 is equipped with a guide rail 33, and a slider 331 is connected below the test platform 1, slidingly connected to the guide rail 33. A push block protrudes from the test platform 1, facilitating manual movement of the test platform 1 towards the lifting assembly 4, and also allowing manual pulling of the test platform 1 away from the lifting assembly 4. The guide rail 33 and slider 331 limit the movement trajectory of the test platform 1, ensuring accurate movement from the loading position to the testing position and smooth movement of the test platform 1.

[0074] In some embodiments, see Figure 1 and Figure 4 A sealing gasket 18 is provided in the test area for placing the microphone under test 5. The sealing gasket 18 has a connecting hole that communicates with the first through hole 11. When the pressure block 2 is pressed down, the microphone under test 5 is located between the sealing ring 22 and the sealing gasket 18, which helps prevent the microphone under test 5 from being crushed. After contact with the microphone under test 5, the silicone sealing ring 22 is compressed, creating a sealed environment for testing and improving the test results.

[0075] In some embodiments, see Figure 6 and Figure 7 A guide post 24 is provided below the pressure block 2, and a guide hole 19 is provided on the test platform 1. The guide post 24 can extend into the guide hole 19. By setting the guide post 24 and the guide hole 19, the precise docking of the pressure block 2 and the test platform 1 can be ensured.

[0076] See Figure 3 and Figure 5 The connecting channel 12 includes a relay cavity 121 and a second through hole 122. The relay cavity 121 connects the first mounting slot 13 and the first through hole 11, and the second through hole 122 connects the relay cavity 121 and the second mounting slot 14. Both the microphone under test 5 and the standard microphone 131 are connected to the second mounting slot 14 through the connecting channel 12, thereby ensuring the consistency of the sound data before recording and improving the accuracy of the test.

[0077] The working principle of this utility model:

[0078] Initially, test platform 1 is in the loading position. The microphone under test 5 is placed in the test area, and the electrical terminals 52 of the microphone under test 5 are covered on the pin header 151. Test platform 1 is pushed towards lifting assembly 4. Test platform 1 moves to the test position and moves below pressure block 2 and pressure head 421. Insert block 16 extends into clamping groove 311, positioning bead abuts against insert block 16, and second sensing plate 17 extends into groove of third sensor 32. Lifting cylinder 42 drives pressure block 2 and pressure head 421 to descend. Pressure head 421 presses the electrical terminals 52 of microphone under test 5 onto pin header 151. Sealing ring 22 at the lower end of pressure block 2 abuts against microphone under test 5 and seals the outside of recording module 51.

[0079] 1. Test 1: The first speaker 141 does not produce sound, the second speaker 23 produces sound, the microphone under test 5 generates a signal and sends it to the controller, and the controller judges the performance of the microphone under test 5.

[0080] 2. Test 2: The second speaker 23 does not produce sound, the first speaker 141 produces sound, the standard microphone 131 and the microphone under test 5 synchronously generate signals and send them to the controller, and the controller judges the performance of the microphone under test 5 by comparison and analysis.

[0081] Acoustic signal excitation: A 20Hz-10kHz broadband sweep frequency signal is generated by the GTS audio test system to drive the first speaker 141 to produce sound.

[0082] Dual-channel synchronous acquisition: The standard microphone 131 (Ref Mic) and the device under test (DUT Mic, microphone 5) are deployed synchronously in the sound field environment to capture the sound pressure response signals of both in real time.

[0083] Feature signal analysis: Based on the frequency domain coherence algorithm, phase / amplitude comparison analysis is performed on the dual signals. By establishing an acoustic transfer function model, the acoustic impedance anomaly characteristics caused by sealing defects are accurately extracted.

[0084] Quantitative evaluation of sealing performance: A Sealing sealing performance curve is constructed based on the frequency response curve offset and the degree of resonance peak attenuation to achieve quantitative detection of micron-level leakage defects.

[0085] Full-frequency acoustic characterization: A dedicated acoustic testing platform for Flex products was constructed by integrating low-frequency sweep excitation (20Hz-10kHz) and sound field coupling algorithm.

[0086] Cross-medium inspection capability: Breaking through the limitations of traditional contact flaw detection technology, it realizes three-dimensional acoustic tomography of the FPC substrate packaging structure and solder joint interface.

[0087] Online process closed loop: Establish a dynamic mapping model between acoustic characteristic parameters and welding quality database to achieve process control accuracy of CPK≥1.67.

[0088] Submicron-level defect analysis, based on the principle of acoustic modal resonance and employing multi-physics coupling modeling technology, can accurately identify anomalies in the audio parameters of the product's welded surface. Through an acoustic phase coherence algorithm, it achieves a positioning accuracy of ±0.05mm for broken-loop defects, a 20-fold improvement in resolution compared to the traditional pressure attenuation method.

[0089] Deep structural acoustic imaging utilizes the transmission characteristics of sound waves in the 20Hz characteristic frequency band within flexible substrates (penetration depth up to 0.8mm), combined with analysis and preprocessing using audio testing software. This technology can detect 12 types of hidden defects, including poor adhesive wetting and solder micropores.

[0090] The pressure block 2 is equipped with a standard sealed anechoic cavity, integrating the following core modules: 1. Precision acoustic excitation unit: equipped with a GTS-S-308 standard loudspeaker (second loudspeaker 23), outputting a 120dbSPL 20-10kHz standard test signal. 2. Acoustic conduction system: using a specially designed test cavity to achieve directional conduction of test sound waves. 3. High-precision acquisition module: using a BK4958 measurement sensor in conjunction with the audio acquisition system.

[0091] Technical Advantages: 1. Non-contact inspection: Eliminates the traditional protective film plugging process, removing measurement interference from film thickness tolerance (±0.05mm) and adhesion deviation (>0.3mm). 2. Multi-dimensional defect detection: Weld integrity: Detects weld ring fractures / micro-cracks ≥5μm (equivalent to a phase shift of 2°). 3. Airtightness detection: Sensitivity up to 0.05ml / min leakage flow rate detection. 4. Environmental interference resistance: Cavity shielding >40dB, reducing environmental noise impact by 98.7%.

[0092] Detection Principle: 1. Sound Excitation Stage: The test sound wave with a sound pressure level of 120dB SPL is directionally transmitted to the metal shell of the MIC (recording module 51 of the microphone under test 5) through the cavity structure. 2. Signal Acquisition Stage: The output signal of the DUT and the reference signal are synchronously acquired and coherently analyzed. 3. Defect Judgment: Judgment is made based on transfer function analysis (frequency response deviation > ±1.5dB).

[0093] In summary, although the present invention has been disclosed above, it is not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A microphone testing device for detecting sound input data of a microphone under test, wherein the microphone under test has a recording module and electrical terminals, characterized in that, include: The test platform includes a test area for placing and testing a microphone under test. The test area has a first through hole, and the test platform has a first mounting slot and a second mounting slot. The test platform also has a connecting channel that connects the first through hole, the first mounting slot, and the second mounting slot. The first through hole corresponds to the recording module. A standard microphone is installed in the first mounting slot; The first speaker is installed in the second mounting slot; A pressure block is disposed above the test platform. The pressure block has a sealed chamber with an open lower end, and a sealing ring is provided at the open end of the sealed chamber. The second horn is installed inside the sealed cavity; The controller is electrically connected to the microphone under test, the standard microphone, the first speaker, and the second speaker. The controller is used to compare the signals received by the microphone under test and the standard microphone after receiving sound emitted by the first speaker for testing, and to analyze the signal received by the microphone under test after receiving sound emitted by the second speaker. The microphone testing device has at least a testing state. When the microphone testing device is in the testing state, one end of the pressure block extends into the testing area and abuts against the microphone under test, and the sealing ring wraps around and connects to the outside of the recording module.

2. The microphone testing device according to claim 1, characterized in that, Also includes: The test platform is slidably connected to the base. A lifting assembly is mounted on the base and connected to the pressure block. The lifting assembly is used to drive the pressure block to move up and down relative to the test platform. The microphone testing device also has an open state. When the microphone testing device is in the open state, the pressure block and the testing platform are spaced apart. The testing platform has a testing position and a loading position. When the testing platform is in the loading position, the testing platform is away from the lifting component. When the test platform is in the test position, the test platform is close to the lifting component.

3. The microphone testing device according to claim 2, characterized in that, The test platform is equipped with an adapter board, which is electrically connected to the controller. The adapter board is equipped with a pin header for connecting the electrical terminals of the microphone under test. The lifting assembly is connected to a pressure head. When the microphone testing device is in the test state, the pressure head presses the electrical terminals of the microphone under test onto the pin header.

4. A microphone testing device according to claim 2, characterized in that, The lifting assembly includes a lifting bracket and a lifting cylinder. The lifting bracket is mounted on the base, and the lifting cylinder is mounted on the lifting bracket. A first sensor and a second sensor are provided on the lifting bracket. The output end of the lifting cylinder is connected to a first sensing plate. The first sensor and the second sensor are located on the movement trajectory of the first sensing plate, and the first sensor is located below the second sensor. When the microphone testing device is in testing mode, the first sensing sheet moves to the first sensor.

5. A microphone testing device according to claim 2, characterized in that, A protruding insert is provided on the side of the test platform near the lifting component. A blocking block is provided on the base to limit the movement range of the test platform. A clamping groove is provided on the blocking block for the insert to extend into. A positioning bead is provided in the clamping groove to abut the insert. When the test platform is in the loading position, the insert block moves away from the blocking block; when the test platform is in the testing position, the insert block extends into the clamping groove, and the positioning bead abuts against the insert block.

6. A microphone testing device according to claim 2, characterized in that, A third sensor is provided on the base, and a second sensing plate is provided on the test platform. The third sensor is located on the movement trajectory of the second sensing plate. When the test platform is in the test position, the second sensing element moves to the position of the third sensor; when the test platform is in the loading position, the second sensing element moves away from the third sensor.

7. A microphone testing device according to claim 2, characterized in that, The base is equipped with a guide rail, and a slider is connected below the test platform. The slider is slidably connected to the guide rail.

8. A microphone testing device according to claim 1, characterized in that, The test area is provided with a sealing gasket for placing the microphone under test, and the sealing gasket is provided with a connecting hole that communicates with the first through hole.

9. A microphone testing device according to claim 1, characterized in that, A guide post is provided below the pressure block, and a guide hole is provided on the test platform for the guide post to extend into.

10. A microphone testing device according to claim 1, characterized in that, The connection channel includes a transfer cavity and a second through hole. The transfer cavity connects the first mounting slot and the first through hole, and the second through hole connects the transfer cavity and the second mounting slot.

Images