Seal film breakage detection device and system

Abstract

The application relates to the technical field of sealed film detection, and particularly discloses a sealed film breakage detection device and system. The device is used for testing a to-be-tested equipment, the surface of the to-be-tested equipment is provided with a sealed film, and the device comprises a through pipe and a test structure. The through pipe is used for transmitting sound, the side wall of the through pipe is communicated with a communicating pipe, and the length direction of the communicating pipe is perpendicular to the length direction of the through pipe. The test structure is in the shape of a circular truncated cone, the top end of the test structure is communicated with the through pipe through the communicating pipe, and the bottom end of the test structure is abutted against the surface of the sealed film. The device changes the path of sound wave transmission to the to-be-tested equipment through cooperation of the through pipe and the test structure, optimizes the test method for the to-be-tested equipment, and makes the test result more accurate.

Description

Technical Field

[0001] This invention relates to the field of sealing film testing technology, and more particularly to a sealing film damage detection device and system. Background Technology

[0002] In modern acoustic products, MEMS (Micro Electro Mechanical System) microphones are among the most common. MEMS microphones are acoustic devices that convert sound energy into electrical energy. Their basic working principle is that sound pressure acts on the diaphragm, causing it to deform and altering the capacitance formed with the backplate, thus generating an output voltage and achieving the purpose of converting sound energy into electrical energy. The microphone diaphragm is designed within a cavity. Waterproofing is a basic requirement and a guarantee of quality for microphones, and the microphone sealing membrane is a crucial acoustic component for achieving this function. Once damaged, the microphone loses its waterproof function, and the product quality will be significantly compromised.

[0003] However, existing microphone testing methods cannot detect abnormally damaged samples, which results in significant defects in microphone test results and fails to meet the requirements for detecting damage to the sealing membrane.

[0004] Therefore, detecting damaged microphone sealing diaphragms is crucial for improving product quality. Consequently, a microphone testing device is urgently needed to detect these anomalies. Summary of the Invention

[0005] The purpose of this invention is to provide a sealing film damage detection device and system for detecting damaged samples of the device under test, improving the test results of microphones, and increasing the accuracy of detection.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A sealing membrane damage detection device is used to test a device under test. The device under test has a sealing membrane on its surface and includes a through tube and a test structure. The through tube is used to transmit sound, and a connecting tube is connected to the side wall of the through tube. The length direction of the connecting tube is perpendicular to the length direction of the through tube. The test structure is frustum-shaped, and the top end of the test structure is connected to the through tube through the connecting tube. The bottom end of the test structure presses against the surface of the sealing membrane.

[0008] As a preferred technical solution for the sealing membrane damage detection device, the length direction of the through pipe is parallel to the horizontal plane, and the connecting pipe extends in the vertical direction.

[0009] As a preferred technical solution for the sealing membrane damage detection device, the top end of the connecting tube is connected to the bottom of the through tube, and the bottom end of the connecting tube is connected to the center of the top of the test structure.

[0010] As a preferred technical solution for the sealing membrane damage detection device, the length A of the through pipe is 30R, the inner diameter B of the through pipe is 2R; the inner diameter C of the connecting pipe is 1 / 2R, the length D of the connecting pipe is R; the top diameter E of the test structure is 2R, the bottom diameter F of the test structure is 4.75R, and the height G of the test structure is 2.5R.

[0011] As a preferred technical solution for the sealing membrane damage detection device, the test structure has a first surface at the top and a second surface at the bottom, and the test structure has a plurality of micropores, which connect the first surface and the second surface.

[0012] As a preferred technical solution for the sealing membrane damage detection device, the test structure is made of interwoven fibers.

[0013] A sealing membrane damage detection system includes a test chamber, a test unit, a control device, an output nozzle, and the aforementioned sealing membrane damage detection device. The test unit is positioned opposite the output end of the tube and is used to test the air pressure inside the tube. The output nozzle is positioned opposite the input end of the tube and is used to send sound waves into the tube. The test unit, the sealing membrane damage detection device, the device under test, and the output nozzle are all placed inside the test chamber. The test unit and the output nozzle are respectively connected to the control device.

[0014] As a preferred technical solution for the sealing film damage detection system, the control device includes a processing module and an audio module connected to each other. The test unit is connected to the processing module, and the output air nozzle is connected to the audio module. The processing module is used to supply power to the audio module and the test unit. The information measured by the test unit is transmitted to the audio module through the processing module. The audio module can collect and process the information and control the output frequency of the output air nozzle.

[0015] As a preferred technical solution for the sealing membrane damage detection system, the control device further includes a power amplifier connected between the audio module and the output air nozzle, and the power amplifier is used to increase the power of the input signal.

[0016] As a preferred technical solution for the sealing membrane damage detection system, the control device further includes a positioning seat, which is fixedly installed inside the test chamber for positioning the device under test.

[0017] The beneficial effects of this invention are:

[0018] This sealing membrane damage detection device, through the cooperation of a through-tube and the test structure, uses both ends of the through-tube as the input and output ends of the sound wave. This alters the path of the sound wave transmission to the device under test (DUT), making the sound wave transmission influenced by the through-tube. This helps to enhance the variation amplitude of the sound pressure level comparison curve in the test results, widening the difference value on the curve. This reduces the difficulty for operators in comparing the sound pressure level curve of the sample with that of the DUT, allowing operators to intuitively distinguish the current condition of the DUT and easily detect abnormalities. This design optimizes the testing method for the DUT, making the test results more accurate, facilitating successful testing of the DUT, and ensuring the quality of the DUT.

[0019] This sealing diaphragm damage detection system, through its test unit setup, enables real-time monitoring of air pressure changes at the pipe output end. The output nozzle allows for the transmission of sound waves at a predetermined frequency into the pipe. The control device can adjust the output sound wave frequency, facilitating the testing of different devices under test and expanding the system's application scenarios. Simultaneously, the system receives and processes air pressure change data to plot sound pressure level comparison curves for the devices under test, providing a clear visual representation of the test results. The test chamber design helps reduce sound leakage and energy loss through the output nozzle, minimizing energy consumption during testing and reducing the risk of injury to operators. Using the sealing diaphragm damage detection system, the test results of the devices under test can be directly observed, allowing for a clear determination of whether the device is good or defective. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the sealing film damage detection device provided in an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of the sealing film damage detection device provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the sealing film damage detection system provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the sound pressure level comparison curves before and after the sealing membrane is damaged, provided in an embodiment of the present invention.

[0024] In the picture:

[0025] 100. Sealing membrane damage detection device; 110. Test structure; 120. Through pipe; 130. Connecting pipe; 200. Test box; 300. Test unit; 400. Processing module; 500. Audio module; 600. Power amplifier; 700. Output nozzle; 900. Device under test; 910. Data processing unit. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] like Figures 1 to 3 As shown, this embodiment provides a sealing membrane damage detection device 100 for testing a device under test 900. The surface of the device under test 900 is provided with a sealing membrane, including a through pipe 120 and a test structure 110. The through pipe 120 is used to transmit sound, and a connecting pipe 130 is connected to the side wall of the through pipe 120. The length direction of the connecting pipe 130 is perpendicular to the length direction of the through pipe 120. The test structure 110 is frustum-shaped. The top end of the test structure 110 is connected to the through pipe 120 through the connecting pipe 130, and the bottom end of the test structure 110 presses against the surface of the sealing membrane.

[0031] The sealing membrane damage detection device 100, through the cooperation of the through-tube 120 and the test structure 110, uses both ends of the through-tube 120 as the input and output ends of the sound wave, thereby changing the path of the sound wave transmission to the device under test 900. This alters the sound wave transmission path due to the influence of the through-tube 120, enhancing the variation amplitude of the sound pressure level comparison curve in the test results. This widens the difference value on the curve, reducing the difficulty for operators to compare the sound pressure level curve of the sample with that of the device under test. It allows operators to intuitively distinguish the current condition of the device under test 900, facilitating the detection of abnormal devices. This design optimizes the testing method for the device under test 900, making the test results more accurate, facilitating successful testing of the device under test 900, and ensuring the quality of the device under test 900.

[0032] In this embodiment, the test structure 110 has a first surface at the top and a second surface at the bottom, and the diameter of the second surface is larger than the diameter of the first surface. In other embodiments of this embodiment, the diameters of the first surface and the second surface are equal or different. The specific structure of the test structure 110 is determined by those skilled in the art based on actual engineering conditions, and the determination method is a conventional technical means in the art, which will not be elaborated here.

[0033] The sealing membrane damage detection device 100 has a test structure 110 as a sound transmission component thereon. The test structure 110 has several micro-holes that connect the first surface and the second surface. The above limitations ensure the sound transmission capability of the test structure 110, thus ensuring the successful completion of the detection.

[0034] The test structure 110 is made of interwoven fibers. This design further ensures the ability of the test structure 110 to transmit sound, while also keeping the linear light transmittance of the test structure 110 below 20%.

[0035] In this embodiment, the device under test 900 is a microphone device, which has a data processing unit 910. A sealing film is disposed on the outer surface of the data processing unit 910. The sealing film damage detection device 100 is used to detect whether there is any abnormality such as damage to the sealing film on the microphone device sample. The above detection helps to improve the detection accuracy and reduce the probability of inferior microphones leaving the factory.

[0036] Because the microphone diaphragm is designed within a cavity, it primarily senses changes in sound pressure within that cavity. Furthermore, the pressure difference within the cavity before and after the sealing diaphragm damage causes a difference in the peak points of the sound pressure level comparison curves from the sealing diaphragm damage detection device 100. However, the difference in sound pressure level comparison curves before and after sealing diaphragm damage is relatively small for microphone samples, making it difficult for existing testing methods to detect abnormal samples within the microphone device.

[0037] In this embodiment, when testing the microphone device, the sealing membrane damage detection device 100 can detect the impact of the sealing membrane damage on the air pressure of the entire microphone device before and after the damage, and can amplify the difference value. In view of the above, when using the sealing membrane damage detection device 100 to test the microphone device, the microphone device needs to be regarded as a whole, and the air pressure change at the output end of the tube 120 needs to be recorded and processed.

[0038] Compared to existing microphone device testing methods, the method of testing microphone devices using the sealing membrane damage detection device 100 can amplify the difference value by 4 times, thereby detecting all abnormal samples.

[0039] In this embodiment, the length direction of the through pipe 120 is parallel to the horizontal plane, and the connecting pipe 130 extends vertically. These limitations define the structural layout of the through pipe 120 and the connecting pipe 130, plan their placement, and indirectly restrict the relative positional relationship between the through pipe 120 and the test structure 110. This design optimizes the structure of the sealing membrane damage detection device 100, ensuring that the sound waves are transmitted along a predetermined trajectory, thus guaranteeing the successful completion of the test.

[0040] For example, the top end of the connecting pipe 130 is connected directly below the connecting pipe 120, and the bottom end of the connecting pipe 130 is connected to the center of the top end of the test structure 110. This definition establishes the relative positional relationship between the connecting pipe 120 and the test structure 110, avoiding incorrect test results due to misalignment of the connecting pipe 130. This ensures that the sound pressure level comparison curve of the good test device 900 matches expectations, and allows for sufficient acquisition of the sound pressure level comparison curve of the abnormal test device 900. Simultaneously, it simplifies the structure of the connecting pipe 130, reduces the production cost and processing difficulty of the sealing membrane damage detection device 100, and reduces the space occupied by the sealing membrane damage detection device 100.

[0041] In this embodiment, the length A of the through pipe 120 is 30R, and the inner diameter B of the through pipe 120 is 2R; the inner diameter C of the connecting pipe 130 is 1 / 2R, and the length D of the connecting pipe 130 is R; the top diameter E of the test structure 110 is 2R, the bottom diameter F of the test structure 110 is 4.75R, and the height G of the test structure 110 is 2.5R.

[0042] By defining the dimensions of the test structure 110, the through pipe 120, and the connecting pipe 130, the specific structure of the sealing membrane damage detection device 100 is standardized, ensuring that the sound pressure level comparison curve of the good device under test 900 is consistent with the expectation, and further guaranteeing the ability to collect the sound pressure level comparison curve of the abnormal device under test 900.

[0043] This embodiment also provides a sealing membrane damage detection system, including a test chamber 200, a test unit 300, a control device, an output nozzle 700, and the aforementioned sealing membrane damage detection device 100. The test unit 300 is directly opposite the output end of the through pipe 120 and is used to test the air pressure inside the through pipe 120. The output nozzle 700 is directly opposite the input end of the through pipe 120 and is used to send sound waves into the through pipe 120. The test unit 300, the sealing membrane damage detection device 100, the device under test 900, and the output nozzle 700 are all placed inside the test chamber 200. The test unit 300 and the output nozzle 700 are respectively connected to the control device.

[0044] This sealing membrane damage detection system, through the setup of test unit 300, achieves real-time monitoring of air pressure changes at the output end of pipe 120; through the setup of output nozzle 700, it achieves the purpose of sending sound waves of a predetermined frequency into pipe 120; and the control device can adjust the frequency of the output sound waves, facilitating the testing of different devices under test 900 by the sealing membrane damage detection system, thus helping to expand the application scenarios of the sealing membrane damage detection system. Simultaneously, the sealing membrane damage detection system can also receive and process air pressure change data to plot a sound pressure level comparison curve of device under test 900, thereby intuitively reflecting the test results of device under test 900. The setup of test chamber 200 helps reduce sound wave leakage and energy loss of output nozzle 700, thus reducing energy loss during the testing process and lowering the risk of injury to operators. Using the sealing membrane damage detection system, the test results of device under test 900 can be intuitively observed, thereby clearly determining whether device under test 900 is good or abnormal.

[0045] A sound pressure of 1 Pa is generated by the output nozzle 700, which passes through the conduit 120 and the test structure 110, and is finally collected by the test unit 300. The collected air pressure change data is then used to determine whether there is any malfunction in the sealing membrane of the device under test 900.

[0046] like Figure 4 As shown, with the external conduit 120 added, the peak value difference of the sealing membrane damage detection device 100 before and after the sealing membrane of the device under test 900 is relatively large (increase of 14dB). It is easy to find that the peak value measured by the sealing membrane damage detection device 100 with the conduit 120 is 4 times larger than that measured by the sealing membrane damage detection device 100 without the conduit 120. In summary, due to the addition of the conduit 120 structure, the test results of the sealing membrane damage detection device 100 are more accurate, thereby enhancing the effectiveness of abnormal sample detection.

[0047] Continue to refer to Figures 1 to 3 In this embodiment, the control device includes a processing module 400 and an audio module 500 connected to each other. The test unit 300 is connected to the processing module 400, and the output nozzle 700 is connected to the audio module 500. The processing module 400 is used to supply power to the audio module 500 and the test unit 300. The information measured by the test unit 300 is transmitted to the audio module 500 through the processing module 400. The audio module 500 can collect and process information and control the output frequency of the output nozzle 700.

[0048] The processing module 400 ensures a smooth power supply to the audio module 500 and the test unit 300, contributing to the long-term stable operation of the sealing membrane damage detection system. Simultaneously, the processing module 400 also serves as a relay for air pressure change data, ensuring that the audio module 500 can successfully collect this data. The audio module 500's functionality enables the collection and processing of air pressure change data, allowing for the accurate plotting of the sound pressure level comparison curve.

[0049] Furthermore, the control device also includes a power amplifier 600, which is connected between the audio module 500 and the output nozzle 700. The power amplifier 600 is used to increase the power of the input signal.

[0050] The power amplifier 600 amplifies the sound waves, ensuring the smooth operation of the output nozzle 700 and helping to further expand the application scenarios of the sealing membrane damage detection system.

[0051] In this embodiment, the control device also includes a positioning seat, which is fixedly installed inside the test box 200 and used to position the device under test 900.

[0052] The positioning base achieves the positioning purpose of the device under test 900, ensuring that the device under test 900 is accurately positioned during testing, guaranteeing the accuracy of the test results, and helping to improve the testing efficiency of the device under test 900.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A sealing film damage detection device for testing a device under test (900), wherein the surface of the device under test (900) is provided with a sealing film, characterized in that, include: A through pipe (120) is used to transmit sound. The side wall of the through pipe (120) is connected to a connecting pipe (130), and the length direction of the connecting pipe (130) is perpendicular to the length direction of the through pipe (120). The test structure (110) is frustum-shaped. The top end of the test structure (110) is connected to the through pipe (120) through the connecting pipe (130), and the bottom end of the test structure (110) presses against the surface of the sealing membrane. The length of the through pipe (120) is parallel to the horizontal plane, and the connecting pipe (130) extends in the vertical direction; The test structure (110) has a first surface at the top and a second surface at the bottom, and the test structure (110) has a plurality of micropores that connect the first surface and the second surface; The test structure (110) is made of interwoven fibers; The sealing membrane damage detection device, through the cooperation of the through pipe (120) and the test structure (110), uses the two ends of the through pipe (120) as the input and output ends of the sound wave, thereby changing the path of the sound wave to the device under test (900), so that the transmission of the sound wave is affected by the through pipe (120), which helps to enhance the change amplitude of the sound pressure level comparison curve of the test result, so as to expand the difference value on the sound pressure level comparison curve.

2. The sealing film damage detection device according to claim 1, characterized in that, The top end of the connecting pipe (130) is connected directly below the connecting pipe (120), and the bottom end of the connecting pipe (130) is connected to the center of the top end of the test structure (110).

3. The sealing film damage detection device according to claim 1, characterized in that, The length A of the through pipe (120) is 30R, and the inner diameter B of the through pipe (120) is 2R; the inner diameter C of the connecting pipe (130) is 1 / 2R, and the length D of the connecting pipe (130) is R; the top diameter E of the test structure (110) is 2R, the bottom diameter F of the test structure (110) is 4.75R, and the height G of the test structure (110) is 2.5R.

4. A sealing membrane damage detection system, characterized in that, The device includes a test chamber (200), a test unit (300), a control device, an output nozzle (700), and a sealing membrane damage detection device according to any one of claims 1-3. The test unit (300) is directly opposite the output end of the through pipe (120) and is used to test the air pressure inside the through pipe (120). The output nozzle (700) is directly opposite the input end of the through pipe (120) and is used to send sound waves into the through pipe (120). The test unit (300), the sealing membrane damage detection device, the device under test (900), and the output nozzle (700) are all placed inside the test chamber (200). The test unit (300) and the output nozzle (700) are respectively connected to the control device.

5. The sealing membrane damage detection system according to claim 4, characterized in that, The control device includes a processing module (400) and an audio module (500) connected to each other. The test unit (300) is connected to the processing module (400), and the output nozzle (700) is connected to the audio module (500). The processing module (400) is used to supply power to the audio module (500) and the test unit (300). The information measured by the test unit (300) is transmitted to the audio module (500) through the processing module (400). The audio module (500) can collect and process the information and control the output frequency of the output nozzle (700).

6. The sealing membrane damage detection system according to claim 5, characterized in that, The control device also includes a power amplifier (600) connected between the audio module (500) and the output nozzle (700), and the power amplifier (600) is used to increase the power of the input signal.

7. The sealing membrane damage detection system according to claim 4, characterized in that, The control device also includes a positioning seat, which is fixedly installed inside the test box (200) and used to position the device under test (900).

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