Miniature speaker

Abstract

This utility model discloses a miniature loudspeaker, including a vibration assembly and a magnetic circuit assembly. The vibration assembly includes a frame, a diaphragm assembly, and a voice coil, with the diaphragm assembly connecting the frame and the voice coil. The magnetic circuit assembly includes a yoke and a side magnet assembly. The side magnet assembly includes a lower magnet and an upper magnet connected together, with their magnetic poles repelling each other. The lower magnet is located below the upper magnet and connected to the yoke, while the upper magnet is connected to the frame. The lower magnet is an elastic magnet. This miniature loudspeaker has a novel structure and low self-vibration.

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 a side magnetic assembly. The side magnetic assembly includes a lower side magnet and an upper side magnet connected together. The magnetic poles of the lower magnet and the upper magnet repel each other. The lower magnet is located below the upper magnet and connected to the yoke. The upper magnet is connected to the basket frame. The lower magnet is an elastic magnet.

[0005] Furthermore, the elastic magnet is a rubber-based bonded magnet.

[0006] Furthermore, in the edge magnet assembly, the outer wall surface of the upper edge magnet protrudes outward relative to the outer wall surface of the lower edge magnet, and / or, the inner wall surface of the upper edge magnet protrudes inward relative to the inner wall surface of the lower edge magnet.

[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 being rectangular in shape, and the side magnetic assemblies being disposed on the four sides of the central magnetic assembly.

[0011] Furthermore, the side magnet assembly also includes a side washer located above the upper side magnet, and the side washer connects the upper side 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 magnets, and uses an elastic magnet as the lower magnet. 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 upper magnet in the direction away from the yoke is transmitted to the lower magnet for elimination, thereby greatly reducing the traction force on the yoke in the direction closer to the diaphragm assembly. When the voice coil vibrates towards the yoke, the pulling force on the frame in the direction closer to the yoke is transmitted to the lower magnet for elimination, thereby greatly reducing the thrust force on the yoke in the direction away from the diaphragm assembly. Thus, the driving force of the yoke in the direction closer to 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 magnets also allow the buffer rubber 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. Side magnetic assembly; 231. Lower side magnet; 232. Upper side magnet; 233. Side washer; 24. Magnetic gap. 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 4 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 a side magnetic assembly 23. The side magnetic assembly 23 includes a lower side magnet 231 and an upper side magnet 232 connected together. The magnetic poles of the lower magnet 231 and the upper magnet 232 repel each other. The lower magnet 231 is located below the upper magnet 232 and is connected to the yoke 21. The upper magnet 232 is connected to the basket frame 11. The lower magnet 231 is an elastic magnet.

[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 a repulsive upper magnet 232 and a lower magnet 231, and uses an elastic magnet as the lower magnet 231. This allows the frame 11, diaphragm assembly 12, voice coil 13, and upper magnet 232 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 upper magnet 232 in the direction away from the yoke 21 is transmitted to the lower magnet 231 for elimination, thereby greatly reducing the traction force on the yoke 21 in the direction towards the diaphragm. 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 lower magnet 231 to eliminate it, thereby greatly reducing the thrust on the yoke 21 towards the direction 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, which improves the self-vibration phenomenon of the miniature loudspeaker, making it particularly suitable for large amplitude miniature loudspeakers. The repulsive upper magnet 232 and lower magnet 231 allow the buffer rubber layer to maintain a certain bidirectional deformation margin.

[0020] Furthermore, the elastic magnet is a rubber-based bonded magnet.

[0021] As can be seen from the above description, the specific type of elastic magnet can be selected as needed.

[0022] Furthermore, in the edge magnet assembly 23, the outer wall surface of the upper edge magnet 232 protrudes outward relative to the outer wall surface of the lower edge magnet 231, and / or, the inner wall surface of the upper edge magnet 232 protrudes inward relative to the inner wall surface of the lower edge magnet 231.

[0023] As can be seen from the above description, the lower magnet 231 has sufficient deformation margin. During the process of the upper magnet 232 approaching the yoke 21, the elastic magnet will neither extend into the magnetic gap 24 and collide with the voice coil 13, nor will it expand outward and exceed the outer contour surface of the miniature speaker.

[0024] Please refer to Figure 2 and Figure 5 Furthermore, the yoke 21 is provided with a positioning groove 211 for positioning the lower magnet 231.

[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 231, which helps to ensure the installation accuracy of the lower magnet 231.

[0026] Please refer to Figure 4 Furthermore, the thickness of the upper magnet 232 and the thickness of the lower magnet 231 connected thereto may be the same or different.

[0027] Please refer to Figure 4 Furthermore, the length of the upper magnet 232 and the length of the lower magnet 231 connected thereto may be the same or different.

[0028] Please refer to Figures 2 to 3 Furthermore, the magnetic circuit assembly 2 also includes a central magnetic assembly 22 disposed on the yoke 21. The central magnetic assembly 22 is rectangular in shape, and the side magnetic assemblies 23 are respectively disposed on the four sides of the central magnetic assembly 22.

[0029] As described above, the four sides of the speaker frame 11 are provided with lower magnets 231, which helps to improve the structural stability of the miniature speaker to a greater extent, reduce the risk of the upper magnet 232 accidentally detaching from the lower magnet 231, and at the same time improve the performance of the miniature speaker.

[0030] Please refer to Figure 2 and Figure 4 Furthermore, the side magnet assembly 23 also includes a side washer 233, which is located above the upper side magnet 232 and is connected to the upper side magnet 232 and / or the basin stand 11.

[0031] As described above, the Bianwasi 233 can guide magnetic field lines to the magnetic gap 24 of the magnetic circuit assembly 2, thereby improving the utilization rate of magnetic force.

[0032] Please refer to Figure 2 and Figure 4 Furthermore, the basin stand 11 and the side washer 233 are integrally formed into a single structure.

[0033] Please refer to Figure 2 and Figure 4 Furthermore, the basin stand 11 is a metal structural component, and the side washer 233 is formed by bending a portion of the basin stand 11.

[0034] As can be seen from the above description, the fact that the frame 11 and the washer 233 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 refer to Figures 1 to 4 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 a side magnetic assembly 23. The side magnetic assembly 23 includes a lower magnet 231 and an upper magnet 232 connected together. The lower magnet 231 and the upper magnet 232 have repulsive magnetic poles. The lower magnet 231 is located below the upper magnet 232 and is connected to the yoke 21. The upper magnet 232 is connected to the frame 11. The lower magnet 231 is an elastic magnet, and the upper magnet 232 is a magnet. The central magnetic assembly 22 is disposed on the yoke 21 and forms a magnetic gap 24 between it and the upper magnet 232 for the voice coil 13 to move. The central magnetic assembly 22 is located between at least one set of two oppositely arranged side magnetic assemblies 23. The lower magnet 231 and the upper magnet 232 can be connected and fixed by means of adhesive or other methods.

[0037] Please refer to Figure 2 When the end of the lower magnet 231 furthest from the yoke 21 is the S pole, the end of the upper magnet 232 closest to the yoke 21 is also the S pole, thus creating a repulsive effect; when the end of the lower magnet 231 furthest from the yoke 21 is the N pole, the end of the upper magnet 232 closest to the yoke 21 is also the N pole, thus creating a repulsive effect; the repulsive upper magnet 232 and lower magnet 231 can ensure that the elastic magnet has sufficient bidirectional deformation margin.

[0038] The elastic magnet is a rubber-based bonded magnet. The bonded magnet is a composite magnet made by mixing permanent magnet powder with a binder and then molding it through processes such as extrusion molding, calendering molding, or injection molding. The rubber-based bonded magnet uses rubber as a binder.

[0039] Please refer to Figures 2 to 3 In this embodiment, the outer wall surface of the upper magnet 232 is flush with the outer wall surface of the lower magnet 231, and the inner wall surface of the upper magnet 232 is flush with the inner wall surface of the lower magnet 231. To allow the lower magnet 231 sufficient deformation allowance, in other embodiments, in the side magnet assembly 23, the outer wall surface of the upper magnet 232 protrudes outward relative to the outer wall surface of the lower magnet 231, and / or, the inner wall surface of the upper magnet 232 protrudes inward relative to the inner wall surface of the lower magnet 231.

[0040] Please refer to Figure 2 and Figure 5 To facilitate the positioning and installation of the lower magnet 231, in this embodiment, the yoke 21 is provided with a positioning groove 211 for positioning the lower magnet 231.

[0041] The thickness of the upper magnet 232 may be the same as or different from the thickness of the lower magnet 231 connected to it; the length of the upper magnet 232 may be the same as or different from the length of the lower magnet 231 connected to it; the width of the upper magnet 232 may be the same as or different from the width of the lower magnet 231 connected to it; the specific design can be selectively made according to actual needs.

[0042] Please refer to Figure 2 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, and the side magnetic assemblies 23 are respectively provided on the four sides of the central magnetic assembly 22.

[0043] Please refer to Figure 2 and Figure 4 The side magnet assembly 23 also includes a side washer 233, which is located above the upper side magnet 232 and connects the upper side magnet 232 and / or the basin stand 11; the side washer 233 is aligned or nearly aligned with the center washer 222.

[0044] In one or more embodiments, the basin stand 11 and the washer 233 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 233 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 a side magnetic assembly. The side magnetic assembly includes a lower side magnet and an upper side magnet connected together. The magnetic poles of the lower magnet and the upper magnet repel each other. The lower magnet is located below the upper magnet and connected to the yoke. The upper magnet is connected to the basket frame. The lower magnet is an elastic magnet.

2. The miniature loudspeaker according to claim 1, characterized in that, The elastic magnet is a rubber-based bonded magnet.

3. The miniature loudspeaker according to claim 1, characterized in that, In the edge magnet assembly, the outer wall surface of the upper magnet protrudes outward relative to the outer wall surface of the lower magnet, and / or, the inner wall surface of the upper magnet protrudes inward relative to the inner wall surface of the lower magnet.

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 may be the same as or different from the length of the lower magnet connected to it.

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 side magnetic assemblies are disposed on the four sides of the central magnetic assembly.

8. The miniature loudspeaker according to claim 1, characterized in that, The side magnet assembly also includes a side washer located above the upper side magnet, and the side washer connects 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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