Micro-speaker

Abstract

The utility model discloses a micro loudspeaker, including vibration subassembly and magnetic circuit subassembly, vibration subassembly includes basin frame, diaphragm subassembly and voice coil, and diaphragm subassembly connects basin frame with voice coil, and magnetic circuit subassembly includes yoke and repelling lower edge magnetic steel and upper edge magnetic steel, and lower edge magnetic steel is located below upper edge magnetic steel and connects yoke, and upper edge magnetic steel connects basin frame, and upper edge magnetic steel and lower edge magnetic steel are bonded through buffer rubber layer. This micro loudspeaker is novel in structure, and small in self-shaking.

Description

Technical Field

[0001] This utility model relates to the field of electroacoustic converter technology, and in particular to miniature loudspeakers. Background Technology

[0002] Currently, mobile devices such as smartphones and tablets enrich people's lives. Electroacoustic transducers, as audio devices, play an indispensable role in various mobile devices. As consumers' demands for sound loudness increase, designers are correspondingly raising the performance requirements for electroacoustic transducers. When a miniature speaker is powered on, an audio current flows through the voice coil (coil) in a magnetic field, generating a magnetic field that varies with the audio current. This magnetic field interacts with the magnetic field of the permanent magnet, causing the voice coil to vibrate axially to produce sound. From the amplitude of 0.2mm in traditional miniature speakers to 0.65mm or more in master-level miniature speakers, the larger the amplitude of the diaphragm, the more intense the vibration (jitter) of the miniature speaker itself becomes, resulting in higher background noise or distortion. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a novel miniature loudspeaker with low self-vibration.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a miniature loudspeaker, comprising: A vibrating assembly, which includes a frame, a diaphragm assembly and a voice coil, wherein the diaphragm assembly connects the frame and the voice coil; A magnetic circuit assembly includes a yoke and repulsive lower and upper magnets. The lower magnet is located below the upper magnet and connected to the yoke. The upper magnet is connected to the basket frame. The upper and lower magnets are bonded together by a buffer adhesive layer.

[0005] Furthermore, the buffer adhesive layer is MS sealant, polyurethane adhesive, acrylic adhesive, or room temperature vulcanizing silicone rubber.

[0006] Furthermore, the thickness of the buffer adhesive layer ranges from 0.01mm to 0.09mm.

[0007] Furthermore, the yoke is provided with a positioning groove for positioning the lower magnet.

[0008] Furthermore, the thickness of the upper magnet and the thickness of the lower magnet connected to it may be the same or different.

[0009] Furthermore, the length of the upper magnet and the length of the lower magnet connected to it may be the same or different.

[0010] Furthermore, the magnetic circuit assembly also includes a central magnetic assembly disposed on the yoke. The central magnetic assembly is rectangular in shape, and the four sides of the central magnetic assembly are respectively provided with lower magnets and upper magnets connected to the corresponding lower magnets through the buffer adhesive layer.

[0011] Furthermore, the magnetic circuit assembly also includes a side washer located above the upper magnet and connected to the upper magnet and / or the basin stand.

[0012] Furthermore, the basin stand and the side washer are integrally formed into a single structure.

[0013] Furthermore, the basin stand is a metal structural component, and the side washer is formed by bending a portion of the basin stand.

[0014] The beneficial effects of this utility model are as follows: This miniature loudspeaker has a novel structure, which splits the integral edge magnet into repulsive upper and lower edge magnets, and connects the upper and lower edge magnets through a buffer layer. This allows the frame, diaphragm assembly, voice coil, and upper magnet to vibrate together after the voice coil is energized. When the voice coil vibrates away from the yoke, the traction force on the frame away from the yoke is transmitted to the buffer layer for elimination, thus preventing the yoke from experiencing a traction force towards the diaphragm assembly. When the voice coil vibrates towards the yoke, the pulling force on the frame towards the yoke is transmitted to the buffer layer for elimination, thus preventing the yoke from experiencing a thrust force away from the diaphragm assembly. Therefore, the driving force of the yoke towards or away from the diaphragm assembly is suppressed, thereby improving the self-vibration phenomenon of the miniature loudspeaker, which is particularly suitable for large-amplitude miniature loudspeakers. The repulsive upper and lower edge magnets allow the buffer layer to maintain a certain bidirectional deformation margin. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure of a miniature loudspeaker; Figure 2 This is a cross-sectional view of a miniature loudspeaker along its width. Figure 3 This is a cross-sectional view of a miniature loudspeaker along its length. Figure 4 A schematic diagram of part of the structure of a miniature loudspeaker Figure 1 ; Figure 5 A schematic diagram of part of the structure of a miniature loudspeaker Figure 2 .

[0016] Label Explanation: 1. Vibrating assembly; 11. Bass frame; 12. Diaphragm assembly; 13. Voice coil; 2. Magnetic circuit assembly; 21. Yoke; 211. Positioning groove; 22. Central magnetic assembly; 221. Central magnet; 222. Central washer; 23. Lower magnet; 24. Upper magnet; 25. Side washer; 3. Buffer adhesive layer. Detailed Implementation

[0017] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0018] Please refer to Figures 1 to 3 Miniature loudspeakers, including: Vibration assembly 1 includes a frame 11, a diaphragm assembly 12 and a voice coil 13, wherein the diaphragm assembly 12 connects the frame 11 and the voice coil 13; The magnetic circuit assembly 2 includes a yoke 21 and repulsive lower magnet 23 and upper magnet 24. The lower magnet 23 is located below the upper magnet 24 and connected to the yoke 21. The upper magnet 24 is connected to the basket frame 11. The upper magnet 24 and the lower magnet 23 are bonded together by a buffer adhesive layer 3.

[0019] As can be seen from the above description, the beneficial effects of this utility model are as follows: This miniature loudspeaker has a novel structure, which splits the integral side magnet into an opposing upper side magnet 24 and a lower side magnet 23, and connects the upper side magnet 24 and the lower side magnet 23 through a buffer layer 3. This allows the frame 11, diaphragm assembly 12, voice coil 13, and upper magnet 24 to vibrate together after the voice coil 13 is energized. When the voice coil 13 vibrates away from the yoke 21, the traction force on the frame 11 in the direction away from the yoke 21 is transmitted to the buffer layer 3 for elimination, thereby preventing the yoke 21 from being subjected to a force that pulls towards the vibrating yoke 21. When the voice coil 13 vibrates towards the yoke 21, the pulling force on the frame 11 towards the yoke 21 is transmitted to the buffer layer 3 for elimination. This prevents the yoke 21 from being pushed away from the diaphragm assembly 12. As a result, the driving force of the yoke 21 towards or away from the diaphragm assembly 12 is suppressed, thereby improving the self-vibration phenomenon of the miniature speaker, which is particularly suitable for large amplitude miniature speakers. The repulsive upper magnet 24 and lower magnet 23 allow the buffer layer 3 to maintain a certain bidirectional deformation margin.

[0020] Furthermore, the buffer layer 3 is MS sealant, polyurethane adhesive, acrylic adhesive, or room temperature vulcanizing silicone rubber.

[0021] As can be seen from the above description, the buffer adhesive layer 3 uses a colloid with high adhesive strength and high elasticity, which helps to ensure the structural stability of the miniature speaker and reduces the risk of the upper magnet 24 accidentally detaching from the lower magnet 23.

[0022] Furthermore, the thickness of the buffer adhesive layer 3 ranges from 0.01mm to 0.09mm.

[0023] As can be seen from the above description, the thickness of the buffer layer 3 is appropriate, taking into account both the overall size of the miniature speaker and the self-vibration improvement effect.

[0024] Please combine Figure 2 and Figure 5 Furthermore, the yoke 21 is provided with a positioning groove 211 for positioning the lower magnet 23.

[0025] As can be seen from the above description, the presence of the positioning groove 211 facilitates the positioning and installation of the lower magnet 23, which helps to ensure the installation accuracy of the lower magnet 23.

[0026] Furthermore, the thickness of the upper magnet 24 and the thickness of the lower magnet 23 connected thereto may be the same or different.

[0027] Please combine Figure 1 and Figure 5 Furthermore, the length of the upper magnet 24 and the length of the lower magnet 23 connected to it may be the same or different.

[0028] Please combine Figure 1 , Figure 4 and Figure 5 Furthermore, the magnetic circuit assembly 2 also includes a central magnetic assembly 22 disposed on the yoke 21. The central magnetic assembly 22 is generally rectangular in shape, and the four sides of the central magnetic assembly 22 are respectively provided with lower magnets 23 and upper magnets 24 connected to the corresponding lower magnets 23 through the buffer adhesive layer 3.

[0029] As described above, the four sides of the frame 11 are provided with buffer rubber layers 3, which helps to improve the structural stability of the miniature speaker to a greater extent, reduce the risk of the upper magnet 24 accidentally detaching from the lower magnet 23, and at the same time improve the performance of the miniature speaker.

[0030] Please combine Figure 3 and Figure 4 Furthermore, the magnetic circuit assembly 2 also includes a side washer 25, which is located above the upper magnet 24 and is connected to the upper magnet 24 and / or the basin stand 11.

[0031] As can be seen from the above description, the fins 25 can guide magnetic field lines to the magnetic gap of the magnetic circuit assembly 2, thereby improving the utilization rate of magnetic force.

[0032] Please combine Figure 2 Furthermore, the basin stand 11 and the side washer 25 are integrally formed into a single structure.

[0033] Furthermore, the basin stand 11 is a metal structural component, and the side washer 25 is formed by bending a portion of the basin stand 11.

[0034] As can be seen from the above description, the fact that the basin frame 11 and the washer 25 are integrally formed can facilitate the processing and manufacturing of the components of the miniature speaker.

[0035] Embodiment 1 of this utility model is a miniature speaker, which can be applied to electronic products such as mobile phones, tablets, smartwatches, AR glasses, and headphones.

[0036] Please combine Figures 1 to 3 The miniature loudspeaker includes a vibration assembly 1 and a magnetic circuit assembly 2. The vibration assembly 1 includes a frame 11, a diaphragm assembly 12, and a voice coil 13. The diaphragm assembly 12 connects the frame 11 and the voice coil 13, and the voice coil 13 is located in the hollow area of ​​the frame 11. The magnetic circuit assembly 2 includes a yoke 21, a central magnetic assembly 22, and repulsive lower magnets 23 and upper magnets 24. The lower magnet 23 is located below the upper magnet 24 and connected to the yoke 21. The upper magnet 24 is connected to the frame 11, and the upper magnet 24 and the lower magnet 23 are bonded together by a buffer adhesive layer 3. The central magnetic assembly 22 is disposed on the yoke 21 and forms a magnetic gap between it and the upper magnet 24 for the movement of the voice coil, and is located between at least one set of two oppositely arranged lower magnets 23.

[0037] When the end of the lower magnet 23 connected to the buffer layer 3 is the S pole, the end of the upper magnet 24 connected to the buffer layer 3 is also the S pole, thus creating a repulsive effect; when the end of the lower magnet 23 connected to the buffer layer 3 is the N pole, the end of the upper magnet 24 connected to the buffer layer 3 is also the N pole, thus creating a repulsive effect; the repulsive upper magnet 24 and lower magnet 23 can ensure that the buffer layer 3 has sufficient bidirectional deformation margin.

[0038] The buffer layer 3 is MS sealant, polyurethane adhesive, acrylic adhesive, room temperature vulcanizing silicone rubber, or other colloids that simultaneously possess high viscosity and high elasticity.

[0039] The thickness of the buffer adhesive layer 3 ranges from 0.01mm to 0.09mm, preferably from 0.03mm to 0.07mm. In this embodiment, the thickness of the buffer adhesive layer 3 is 0.05mm.

[0040] Please combine Figure 2 and Figure 5 To facilitate the positioning and installation of the lower magnet 23, in this embodiment, the yoke 21 is provided with a positioning groove 211 for positioning the lower magnet 23.

[0041] The thickness of the upper magnet 24 and the thickness of the lower magnet 23 connected to it may be the same or different; the length of the upper magnet 24 and the length of the lower magnet 23 connected to it may be the same or different; the width of the upper magnet 24 and the width of the lower magnet 23 connected to it may be the same or different; the specific design can be selectively made according to actual needs.

[0042] Please combine Figure 2 and Figure 3 The central magnetic assembly 22 includes a central magnet 221 and a central washer 222 located above the central magnet 221. The central magnet 221 connects the central washer 222 and the yoke 21. In this embodiment, the central magnetic assembly 22 is generally rectangular in shape. The four sides of the central magnetic assembly 22 are respectively provided with lower magnets 23 and upper magnets 24 connected to the corresponding lower magnets 23 through the buffer adhesive layer 3.

[0043] Please combine Figure 3 and Figure 4 The magnetic circuit assembly 2 further includes a side washer 25, which is located above the upper magnet 24 and connects the upper magnet 24 and / or the basin stand 11; the side washer 25 is aligned or nearly aligned with the center washer 222.

[0044] In one or more embodiments, the basin stand 11 and the washer 25 are integrally formed, for example, by bending or by insert injection molding. In this embodiment, the basin stand 11 is a metal structural component, and the washer 25 is formed by bending a portion of the basin stand 11.

[0045] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A miniature loudspeaker, characterized in that, include A vibrating assembly, which includes a frame, a diaphragm assembly and a voice coil, wherein the diaphragm assembly connects the frame and the voice coil; A magnetic circuit assembly includes a yoke and repulsive lower and upper magnets. The lower magnet is located below the upper magnet and connected to the yoke. The upper magnet is connected to the basket frame. The upper and lower magnets are bonded together by a buffer adhesive layer.

2. The miniature loudspeaker according to claim 1, characterized in that, The buffer layer is MS sealant, polyurethane adhesive, acrylic adhesive, or room temperature vulcanizing silicone rubber.

3. The miniature loudspeaker according to claim 1, characterized in that, The thickness of the buffer adhesive layer ranges from 0.01mm to 0.09mm.

4. The miniature loudspeaker according to claim 1, characterized in that, The yoke is provided with a positioning groove for positioning the lower magnet.

5. The miniature loudspeaker according to claim 1, characterized in that, The thickness of the upper magnet and the thickness of the lower magnet connected to it may be the same or different.

6. The miniature loudspeaker according to claim 1, characterized in that, The length of the upper magnet and the length of the lower magnet connected to it may be the same or different.

7. The miniature loudspeaker according to claim 1, characterized in that, The magnetic circuit assembly also includes a central magnetic assembly disposed on the yoke. The central magnetic assembly is rectangular in shape, and the four sides of the central magnetic assembly are respectively provided with lower magnets and upper magnets connected to the corresponding lower magnets through the buffer adhesive layer.

8. The miniature loudspeaker according to claim 1, characterized in that, The magnetic circuit assembly also includes a side washer located above the upper magnet and connected to the upper magnet and / or the basin stand.

9. The miniature loudspeaker according to claim 8, characterized in that, The basin stand and the side washer are integrally formed into a single structure.

10. The miniature loudspeaker according to claim 9, characterized in that, The basin stand is a metal structural component, and the side washer is formed by bending a portion of the basin stand.

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