Testing device for high-sensitivity anti-interference miniature loudspeaker
By combining the limiting module and vacuum suction device, along with the position adjustment module and double-layer shielding structure, the problems of electromagnetic interference and noise in the testing of miniature loudspeakers are solved, and an efficient and accurate testing process and signal processing are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHANGZHOU HUALONG ELECTRONICS CO LTD
- Filing Date
- 2026-01-09
- Publication Date
- 2026-04-14
AI Technical Summary
Existing technologies for testing miniature loudspeakers suffer from limitations such as the test environment being susceptible to electromagnetic interference and background noise, making it difficult to achieve both testing efficiency and accuracy, and also making it difficult to adapt to the rapid replacement requirements of miniature loudspeakers of different sizes.
The flexible limiting post of the limiting module works in conjunction with the vacuum suction device, combined with the XYZ precision positioning of the position adjustment module and the electric push rod control, along with the double-layer shielding structure and differential amplification module, to achieve fast and flexible clamping, precise alignment and systematic anti-interference processing of the speaker.
It enables rapid, reliable mounting and precise alignment of miniature loudspeakers, suppresses electromagnetic interference and sound reflection, improves test repeatability, accuracy and signal fidelity, and adapts to efficient quality control of products of different sizes.
Smart Images
Figure CN121865192A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electroacoustic device testing, and in particular to a testing device for a highly sensitive, interference-resistant miniature loudspeaker. Background Technology
[0002] Miniature loudspeakers are small, compact electroacoustic transducers that efficiently convert audio electrical signals into mechanical vibrations through the combined action of an internal magnetic circuit system and a vibration system. These vibrations then drive the air to vibrate and produce sound. Miniature loudspeakers are characterized by their small size, light weight, and low power consumption. They are widely used in portable electronic products such as mobile phones, headphones, tablets, and smart wearable devices, as well as in small speakers and car interior audio systems.
[0003] As consumer electronic devices become increasingly thinner and lighter, the size of miniature speakers continues to shrink while the requirements for acoustic performance continue to increase. Currently, the industry generally adopts a testing scheme that uses an acoustic test box with a standard microphone. However, this scheme has significant drawbacks, such as the test environment being susceptible to electromagnetic interference and background noise, making it difficult to achieve both testing efficiency and accuracy. Furthermore, simple fixtures exhibit significant fluctuations in test data under electromagnetic interference environments, and traditional devices are difficult to adapt to the rapid replacement requirements of miniature speakers of different sizes. Summary of the Invention
[0004] To achieve the above objectives, the present invention provides the following technical solution: a testing device for a highly sensitive anti-interference miniature loudspeaker, comprising a workbench, a testing module disposed on the top of the workbench, a position adjustment module disposed on the top of the workbench, and a limit module disposed on the position adjustment module; The limiting module includes a mounting block, the mounting block having an internal mounting groove, a first spring fixedly connected to the inner wall of the mounting groove, a connecting block fixedly connected to the side of the first spring away from the inner wall of the mounting groove, a limiting post fixedly connected to the side of the connecting block away from the first spring, a ball joint bearing fixedly connected to the top of the limiting post, a mounting box fixedly connected to the outer side of the ball joint bearing, a second spring fixedly connected to the inner wall of the mounting box, a connecting rod fixedly connected to the side of the second spring away from the inner wall of the mounting box, and a limiting block fixedly connected to the side of the connecting rod away from the second spring.
[0005] Preferably, the test module includes an outer cabin, an inner cabin is installed on the top of the workbench, a column is fixedly connected to the top of the workbench, an electric push rod is fixedly connected to the top of the column, a connecting frame is detachably connected to the output end of the electric push rod, a sealing cover is fixedly connected to the bottom of the connecting frame, an installation ring is detachably connected to the bottom of the sealing cover, and a microphone is installed at the bottom of the installation ring.
[0006] Preferably, both the outer and inner cabins are fixed to the top surface of the workbench by insulating pad bolts. The space between the outer and inner cabins is filled with silicone damping material. The inner wall of the inner cabin is covered with polyurethane sound-absorbing cotton. The top surface of the workbench and the inner side of the inner cabin are covered with resonant sound-absorbing panels. The front sidewalls of the outer and inner cabins overlap to form a visualization window. The outer side of the outer cabin is provided with a differential amplification module.
[0007] Preferably, the sealing cover is fitted with a sealing ring on the outside, the number of microphones is not less than thirty-two and they are evenly distributed at the bottom of the mounting ring, the sealing cover is fixedly connected to the inside of the sealing cover, the wiring inside the mounting ring gathers all the microphone signal value terminals and is connected to the differential amplifier module on the outside of the outer cabin through a shielded twisted pair cable harness.
[0008] Preferably, the position adjustment module includes a first electric slide rail, a first electric slider slidably connected to the first electric slide rail, a second electric slide rail fixedly connected to the top of the first electric slider, a second electric slider slidably connected to the second electric slide rail, a third electric slide rail fixedly connected to the second electric slider, a third electric slider slidably connected to the third electric slide rail, a mounting base fixedly connected to the outer side of the third electric slider, and a vacuum suction device mounted on the top of the mounting base.
[0009] Preferably, there are two first electric slide rails, which are symmetrically installed on the top surface of the workbench. Both first electric slide rails are located inside the inner compartment. The projection of the second electric slide rail on the workbench is perpendicular to the first electric slide rail. The third electric slide rail is set perpendicular to the workbench.
[0010] Preferably, the inner cabin has a connecting pipe fixedly connected to the side wall, extending to the outside of the outer cabin, and the vacuum suction device is connected to an external vacuum generator through the connecting pipe.
[0011] Preferably, the mounting block is fixedly connected to the top of the mounting base, and the mounting block is provided with clearance holes adapted to the vacuum suction device.
[0012] Preferably, the mounting block is provided with a first movable groove that is adapted to the moving trajectory of the connecting block and the limiting post and communicates with the mounting groove, the top of the mounting base is provided with a second movable groove that is adapted to the moving trajectory of the limiting post, and the outer sides of the limiting post and the limiting block are covered with soft silicone.
[0013] In summary, the present invention provides a testing device for a highly sensitive, interference-resistant miniature loudspeaker, which has the following beneficial effects: 1. This high-sensitivity, anti-interference miniature loudspeaker testing device achieves rapid, flexible clamping and secure fixing of the loudspeaker through the synergistic effect of the elastic limiting post of the limiting module and the vacuum suction cup. At the same time, it supports rapid replacement of products of different sizes, enhancing the adaptability and maintainability of the equipment, making it particularly suitable for high-efficiency quality control and reliability assessment on miniature loudspeaker production lines.
[0014] 2. The testing device for this highly sensitive and anti-interference miniature loudspeaker achieves precise positioning of the loudspeaker under test in the XYZ directions by driving the mounting base and vacuum fixture through the position adjustment module. This ensures that the sound-emitting surface is precisely aligned with the center of the microphone array on the mounting ring. Combined with the electric push rod-controlled sealing cover for rapid opening, closing and sealing, the acoustic coupling conditions of each test are highly consistent, thereby significantly improving the repeatability and accuracy of the test.
[0015] 3. The testing device for this high-sensitivity, anti-interference miniature loudspeaker utilizes a double-layer shielding structure consisting of an outer and inner chamber. The silicone damping material filling the space between the chambers, the polyurethane sound-absorbing cotton covering the inner chamber walls, and the resonant sound-absorbing plate at the bottom together form a composite electromagnetic and acoustic isolation layer. This effectively suppresses external electromagnetic interference and internal sound reflection. Simultaneously, the differential amplification module performs anti-common-mode processing on the weak signals collected by the microphone array. Combined with shielded twisted-pair cable transmission, a systematic anti-interference system is achieved from hardware to the signal link, ensuring high fidelity of the test signal. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the connecting frame and related parts of the present invention; Figure 3 This is a schematic diagram of the workbench and related parts of the present invention; Figure 4 This is a schematic diagram of the position adjustment module and its related parts of the present invention; Figure 5 This is a schematic diagram of the structure of the mounting base of the present invention; Figure 6 This is a schematic diagram of the limiting module and related parts of the present invention; Figure 7 This is a schematic diagram of the internal structure of the mounting box of the present invention.
[0017] Explanation of reference numerals in the attached figures: 1. Workbench; 2. Test module; 201. Outer cabin; 202. Inner cabin; 203. Column; 204. Electric push rod; 205. Connecting frame; 206. Sealing cover; 207. Mounting ring; 208. Microphone; 3. Position adjustment module; 301. First electric slide rail; 302. First electric slider; 303. Second electric slide rail; 304. Second electric slider; 305. Third electric slide rail; 306. Third electric slider; 307. Mounting base; 308. Vacuum suction device; 4. Limiting module; 401. Mounting block; 402. Mounting groove; 403. First spring; 404. Connecting block; 405. Limiting post; 406. Ball joint bearing; 407. Mounting box; 408. Second spring; 409. Connecting rod; 410. Limiting block. Detailed Implementation
[0018] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Example
[0019] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 A testing device for a highly sensitive and interference-resistant miniature loudspeaker includes a workbench 1, a testing module 2 on the top of the workbench 1, a position adjustment module 3 on the top of the workbench 1, and a limit module 4 on the position adjustment module 3. The limiting module 4 includes a mounting block 401, an mounting groove 402 is provided inside the mounting block 401, a first spring 403 is fixedly connected to the inner wall of the mounting groove 402, a connecting block 404 is fixedly connected to the side of the first spring 403 away from the inner wall of the mounting groove 402, a limiting post 405 is fixedly connected to the side of the connecting block 404 away from the first spring 403, a ball joint bearing 406 is fixedly connected to the top of the limiting post 405, a mounting box 407 is fixedly connected to the outside of the ball joint bearing 406, a second spring 408 is fixedly connected to the inner wall of the mounting box 407, a connecting rod 409 is fixedly connected to the side of the second spring 408 away from the inner wall of the mounting box 407, and a limiting block 410 is fixedly connected to the side of the connecting rod 409 away from the second spring 408.
[0020] Test module 2 includes an outer cabin 201, an inner cabin 202 mounted on the top of workbench 1, a column 203 fixedly connected to the top of workbench 1, an electric push rod 204 fixedly connected to the top of column 203, a connecting bracket 205 detachably connected to the output end of electric push rod 204, a sealing cover 206 fixedly connected to the bottom of connecting bracket 205, a mounting ring 207 detachably connected to the bottom of sealing cover 206, and a microphone 208 mounted on the bottom of mounting ring 207.
[0021] By setting up an inner and outer double-layer chamber and a top retractable sealing cover 206, and coordinating with the column 203 and electric push rod 204, the test chamber can be quickly opened, closed, and sealed. The microphone 208 is integrated into the mounting ring 207 and moves with the sealing cover 206, ensuring the relative fixation of the microphone 208 array and speaker positions during testing, thus improving the repeatability and accuracy of the test. Both the outer cabin 201 and the inner cabin 202 are fixed to the top surface of the workbench 1 by insulating pad bolts. The space between the outer cabin 201 and the inner cabin 202 is filled with silicone damping and shock-absorbing material. The inner wall of the inner cabin 202 is covered with polyurethane sound-absorbing cotton. The top surface of the workbench 1 and the inner side of the inner cabin 202 are covered with resonant sound-absorbing panels. The front side walls of the outer cabin 201 and the inner cabin 202 overlap to form a visualization window. The outer side of the outer cabin 201 is provided with a differential amplification module.
[0022] By setting up a visualization window on the overlapping front sidewalls of the outer cabin 201 and the inner cabin 202, operators can directly observe the mounting status and testing process of the speakers inside the inner cabin 202, realizing visualized monitoring of the testing process. At the same time, the double-layer shielding structure formed by the outer cabin 201 and the inner cabin 202, combined with the silicone damping and shock-absorbing material filling the space between them, the polyurethane sound-absorbing cotton covering the inner wall of the inner cabin 202, and the resonant sound-absorbing plate at the bottom, together form a composite electromagnetic and acoustic isolation layer, effectively suppressing external electromagnetic interference and internal reflected noise. The differential amplification module set on the outside of the outer cabin 201 can differentially amplify the weak signal collected by the microphone 208, further suppressing common-mode interference, thereby achieving systematic anti-interference processing of the test signal in a coordinated manner.
[0023] A sealing ring is fitted on the outside of the sealing cover 206. There are no fewer than thirty-two microphones 208, which are evenly distributed at the bottom of the mounting ring 207. The inside of the sealing cover 206 is fixedly connected with a terminal block. The wiring inside the mounting ring 207 gathers all the signal value terminals of the microphones 208 and is connected to the differential amplifier module on the outside of the outer cabin 201 through a shielded twisted pair cable harness.
[0024] The sealing ring on the outside of the sealing cover 206 enhances the airtightness when the cabin is closed, preventing sound leakage. No fewer than thirty-two equally spaced microphones 208 form a high-density ring array. Combined with the internal wiring, they converge to the terminal block and are connected to the differential amplifier module through shielded twisted pair cables, realizing multi-channel signal synchronous acquisition and anti-common-mode interference, thus improving signal fidelity.
[0025] The position adjustment module 3 includes a first electric slide rail 301, a first electric slider 302 slidably connected to the first electric slide rail 301, a second electric slide rail 303 fixedly connected to the top of the first electric slider 302, a second electric slider 304 slidably connected to the second electric slide rail 303, a third electric slide rail 305 fixedly connected to the second electric slider 304, a third electric slider 306 slidably connected to the third electric slide rail 305, a mounting base 307 fixedly connected to the outside of the third electric slider 306, and a vacuum suction device 308 mounted on the top of the mounting base 307.
[0026] The first electric slide rail 301, the second electric slide rail 303, the third electric slide rail 305, and the corresponding first electric slider 302, second electric slider 304, and third electric slider 306 form a three-axis linkage system, which drives the mounting base 307 and the vacuum suction device 308 to achieve precise positioning in the XYZ directions, so that the speaker can be quickly and accurately aligned with the test position.
[0027] There are two first electric slide rails 301, which are symmetrically installed on the top surface of the workbench 1. Both first electric slide rails 301 are located inside the inner compartment 202. The projection of the second electric slide rail 303 on the workbench 1 is perpendicular to the first electric slide rail 301. The third electric slide rail 305 is set perpendicular to the workbench 1.
[0028] Two symmetrically arranged first electric slide rails 301 enhance horizontal movement stability; the second electric slide rail 303 is arranged perpendicular to the first electric slide rail 301, and the third electric slide rail 305 is perpendicular to the worktable 1, forming an orthogonal coordinate system motion platform, ensuring decoupling of the motion of each axis and high positioning accuracy.
[0029] The inner compartment 202 has a fixed connection pipe extending to the outside of the outer compartment 201, and the vacuum suction device 308 is connected to an external vacuum generator through the connection pipe.
[0030] The vacuum suction device 308 is connected to the external vacuum generator through the connecting pipe on the side wall of the inner chamber 202, which realizes the concealed arrangement of the adsorption gas path and avoids interference from the wiring inside the chamber; at the same time, the electromagnetic shielding integrity of the outer chamber 201 and the inner chamber 202 is maintained to ensure that the test environment is not affected by external aerodynamic noise.
[0031] Mounting block 401 is fixedly connected to the top of mounting base 307, and mounting block 401 is provided with clearance holes that are compatible with vacuum suction device 308.
[0032] Mounting block 401 is fixed to the top of mounting base 307 and leaves working space for vacuum suction device 308 through clearance hole, so that limiting module 4 and vacuum suction mechanism are arranged in space, which can realize mechanical limiting without affecting the suction function, and improve the integration and reliability of clamping system.
[0033] The mounting block 401 is provided with a first movable groove that is adapted to the moving trajectory of the connecting block 404 and the limiting post 405 and communicates with the mounting groove 402. The top of the mounting base 307 is provided with a second movable groove that is adapted to the moving trajectory of the limiting post 405. The outer side of the limiting post 405 is covered with soft silicone.
[0034] The first movable groove on the mounting block 401 and the second movable groove on the mounting base 307 provide guidance and movement space for the connecting block 404 and the limiting post 405, ensuring that the limiting post 405 adapts to expansion and contraction under the action of 403. The outer sides of the limiting post 405 and the limiting block 410 are covered with soft silicone to avoid scratching the speaker surface and increasing friction, thus achieving flexible positioning and product protection.
[0035] In use, the operator first places the miniature speaker to be tested on the vacuum fixture 308. At this time, the limiting block 410 of the limiting module 4 extends under the action of the second spring 408 and achieves multi-directional rotation through the ball joint bearing 406, so that its soft silicone contact surface adaptively conforms to the curved surface of the speaker shell, completing the initial flexible positioning. Then, the vacuum generator is started, and the speaker is firmly adsorbed onto the surface of the vacuum fixture 308 through the negative pressure provided by the connecting pipe. At the same time, the limiting post 405 further adaptively adjusts under the action of the first spring 403 to ensure the stability of the limiting position. Subsequently, the position adjustment module 3 is activated. The second electric slide rail 303 is driven to move along the X-axis by the two symmetrically arranged first electric slide rails 301 and the first electric slider 302 on them. The second electric slider 304 drives the third electric slide rail 305 to move along the Y-axis. The third electric slider 306 finally drives the mounting base 307 and the speaker to be precisely positioned along the Z-axis, so that the speaker... The sound-emitting surface is aligned with the center of the mounting ring 207 below the top sealing cover 206. After positioning, the electric push rod 204 drives the connecting frame 205 to descend via the column 203, pressing the sealing cover 206 and its outer sealing ring against the top opening of the inner cabin 202, forming a sealed test environment with airtightness and electromagnetic shielding. During the test, the speaker plays a sweep frequency signal, and a ring array composed of no less than thirty-two microphones 208 integrated at the bottom of the mounting ring 207 synchronously collects the sound pressure signal. All signals are collected through the terminals inside the sealing cover 206 and transmitted to the differential amplification module on the outside of the outer cabin 201 via a shielded twisted pair cable for anti-interference processing. Throughout the process, the operator can monitor the internal status in real time through the visualization window that overlaps the front sidewall of the outer cabin 201 and the inner cabin 202. After the test, the electric push rod 204 lifts the sealing cover 206, the vacuum is released, the speaker is removed, and a complete automated test cycle is completed.
[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A testing device for a highly sensitive, anti-interference miniature loudspeaker, comprising a workbench (1), characterized in that: The top of the workbench (1) is provided with a test module (2), the top of the workbench (1) is provided with a position adjustment module (3), and the position adjustment module (3) is provided with a limit module (4). The limiting module (4) includes a mounting block (401), an mounting groove (402) is provided inside the mounting block (401), a first spring (403) is fixedly connected to the inner wall of the mounting groove (402), a connecting block (404) is fixedly connected to the side of the first spring (403) away from the inner wall of the mounting groove (402), a limiting post (405) is fixedly connected to the side of the connecting block (404) away from the first spring (403), a ball joint bearing (406) is fixedly connected to the top of the limiting post (405), a mounting box (407) is fixedly connected to the outside of the ball joint bearing (406), a second spring (408) is fixedly connected to the inner wall of the mounting box (407), a connecting rod (409) is fixedly connected to the side of the second spring (408) away from the inner wall of the mounting box (407), and a limiting block (410) is fixedly connected to the side of the connecting rod (409) away from the second spring (408).
2. The testing device for a high-sensitivity, anti-interference miniature loudspeaker according to claim 1, characterized in that: The test module (2) includes an outer cabin (201), an inner cabin (202) is installed on the top of the workbench (1), a column (203) is fixedly connected to the top of the workbench (1), an electric push rod (204) is fixedly connected to the top of the column (203), a connecting frame (205) is detachably connected to the output end of the electric push rod (204), a sealing cover (206) is fixedly connected to the bottom of the connecting frame (205), an installation ring (207) is detachably connected to the bottom of the sealing cover (206), and a microphone (208) is installed at the bottom of the installation ring (207).
3. The testing device for a high-sensitivity, anti-interference miniature loudspeaker according to claim 2, characterized in that: The outer cabin (201) and the inner cabin (202) are both fixed to the top surface of the workbench (1) by insulating pad bolts. The space between the outer cabin (201) and the inner cabin (202) is filled with silicone damping material. The inner wall of the inner cabin (202) is covered with polyurethane sound-absorbing cotton. The top surface of the workbench (1) and the inner side of the inner cabin (202) are covered with resonant sound-absorbing panels. The front side walls of the outer cabin (201) and the inner cabin (202) overlap to provide a visualization window. The outer side of the outer cabin (201) is provided with a differential amplification module.
4. The testing device for a high-sensitivity, anti-interference miniature loudspeaker according to claim 3, characterized in that: The sealing cover (206) is fitted with a sealing ring on the outside. There are no fewer than thirty-two microphones (208) and they are evenly distributed at the bottom of the mounting ring (207). The sealing cover (206) is fixedly connected to the inside of the sealing cover (206). The wiring inside the mounting ring (207) gathers the signal value terminals of all the microphones (208) and connects them to the differential amplifier module on the outside of the outer cabin (201) through a shielded twisted pair cable harness.
5. The testing device for a high-sensitivity, anti-interference miniature loudspeaker according to claim 2, characterized in that: The position adjustment module (3) includes a first electric slide rail (301), a first electric slider (302) is slidably connected to the first electric slide rail (301), a second electric slide rail (303) is fixedly connected to the top of the first electric slider (302), a second electric slider (304) is slidably connected to the second electric slide rail (303), a third electric slide rail (305) is fixedly connected to the second electric slider (304), a third electric slider (306) is slidably connected to the third electric slide rail (305), a mounting base (307) is fixedly connected to the outside of the third electric slider (306), and a vacuum suction device (308) is installed on the top of the mounting base (307).
6. The testing device for a high-sensitivity, anti-interference miniature loudspeaker according to claim 5, characterized in that: The number of the first electric slide rails (301) is two and they are symmetrically installed on the top surface of the workbench (1). Both of the first electric slide rails (301) are located inside the inner cabin (202). The projection of the second electric slide rail (303) on the workbench (1) is perpendicular to the first electric slide rail (301). The third electric slide rail (305) is set perpendicular to the workbench (1).
7. The testing device for a high-sensitivity, anti-interference miniature loudspeaker according to claim 5, characterized in that: The inner chamber (202) has a fixed connection pipe extending to the outside of the outer chamber (201) on its side wall, and the vacuum suction device (308) is connected to an external vacuum generator through the connection pipe.
8. The testing device for a high-sensitivity, anti-interference miniature loudspeaker according to claim 5, characterized in that: The mounting block (401) is fixedly connected to the top of the mounting base (307), and the mounting block (401) is provided with a clearance hole adapted to the vacuum suction device (308).
9. The testing device for a high-sensitivity, anti-interference miniature loudspeaker according to claim 5, characterized in that: The mounting block (401) is provided with a first movable groove that is adapted to the moving trajectory of the connecting block (404) and the limiting post (405) and communicates with the mounting groove (402). The top of the mounting base (307) is provided with a second movable groove that is adapted to the moving trajectory of the limiting post (405). The outer sides of the limiting post (405) and the limiting block (410) are covered with soft silicone.