Loudspeaker and electronic equipment

Abstract

The utility model discloses a loudspeaker and electronic equipment, the loudspeaker comprises a mounting rack, a magnetic circuit system and a vibration system, and the mounting rack is provided with a mounting cavity and an opening communicated with the mounting cavity. The magnetic circuit system is arranged in the mounting cavity and comprises an inner annular magnet assembly and an outer annular magnet assembly which are arranged at an interval in the radial direction of the mounting cavity, the outer annular magnet assembly is located on the outer side of the inner annular magnet assembly, and the inner annular surface of the outer annular magnet assembly and the outer annular surface of the inner annular magnet assembly are spaced to form an annular gap; the magnetic poles of the inner annular magnet assembly and the outer annular magnet assembly are different. The vibration system comprises a vibrating diaphragm, a framework and a voice coil, the vibrating diaphragm is connected to the mounting frame and covers the opening of the mounting cavity, and the framework is connected to the vibrating diaphragm and the voice coil, so that the voice coil is located in the annular gap and correspondingly located in the middle of the inner annular magnet assembly and the middle of the outer annular magnet assembly. According to the technical scheme of the invention, nonlinear distortion can be reduced and tone quality can be improved under a large-amplitude working condition.

Description

Technical Field

[0001] This application relates to the technical field of speakers, and particularly to a loudspeaker and an electronic device. Background Art

[0002] A loudspeaker, also known as a "speaker", is widely used in electronic devices such as headphones or smart speakers. Its main function is to convert electrical signals into sound signals. The working principle of such a loudspeaker depends on the interaction between the constant magnetic field generated by a permanent magnet and the audio current passing through the voice coil, causing the voice coil and the connected diaphragm to vibrate, and then converting electrical energy into sound wave energy and radiating it into the air.

[0003] However, in the large-amplitude working mode, since the voice coil cannot provide enough driving force to make the diaphragm reach the expected vibration amplitude, the sound output of the loudspeaker is limited, resulting in non-linear distortion and distortion of the sound signal, thereby affecting the sound quality of the loudspeaker. Summary of the Utility Model

[0004] Embodiments of this application provide a loudspeaker and an electronic device, which can reduce non-linear distortion and improve sound quality under large-amplitude working conditions.

[0005] In a first aspect, embodiments of this application provide a loudspeaker, which includes:

[0006] A mounting bracket, provided with a mounting cavity and an opening communicating with the mounting cavity;

[0007] A magnetic circuit system, disposed in the mounting cavity. The magnetic circuit system includes an inner annular magnet assembly and an outer annular magnet assembly spaced apart in the radial direction of the mounting cavity. The outer annular magnet assembly is located outside the inner annular magnet assembly. An annular gap is formed between the inner ring surface of the outer annular magnet assembly and the outer ring surface of the inner annular magnet assembly. The inner annular magnet assembly and the outer annular magnet assembly have opposite magnetic poles; and

[0008] A vibration system, the vibration system includes a diaphragm skeleton and a voice coil. The diaphragm is connected to the mounting bracket and covers the opening of the mounting cavity. The skeleton is connected to the diaphragm and the voice coil, so that the voice coil is located in the annular gap and corresponds to the middle parts of the inner annular magnet assembly and the outer annular magnet assembly.

[0009] In a second aspect, embodiments of this application provide an electronic device, which includes a housing and the loudspeaker as described above. The loudspeaker is disposed inside the housing.

[0010] Based on the loudspeaker and electronic device according to the embodiments of the present application, by arranging an inner ring magnet assembly and an outer ring magnet assembly at intervals in the radial direction of the installation cavity, and leaving an annular gap between the inner ring surface of the outer ring magnet assembly and the outer ring surface of the inner ring magnet assembly, and their magnetic poles are different from each other, so as to form a magnetic circuit direction distributed in the radial direction of the installation cavity. At the same time, the voice coil is located in the annular gap and corresponds to the middle parts of the inner ring magnet assembly and the outer ring magnet assembly. In this way, when the voice coil reciprocates in the axial direction of the installation cavity, the whole voice coil is completely located in the magnetic field. Thereby ensuring that the voice coil can obtain a stable driving force (i.e., Lorentz force) during vibration. Even under the working conditions of large amplitudes, the nonlinear deformation caused by insufficient or excessive driving force can be reduced, making the conversion of sound signals smoother and more accurate, reducing the occurrence of nonlinear distortion, and thus improving the sound quality performance of the loudspeaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0012] Figure 1 Schematic structural diagram of an embodiment of the loudspeaker of the present application;

[0013] Figure 2 Schematic cross-sectional structural diagram of the loudspeaker of the present application;

[0014] Figure 3 Schematic cross-sectional structural diagram of the loudspeaker of the present application from another perspective;

[0015] Figure 4 Exploded structural diagram of the loudspeaker of the present application;

[0016] Figure 5 Simulation diagram of the voice coil of the present application in the magnetic field generated by the inner ring magnet assembly and the outer ring magnet assembly.

[0017] Explanation of the reference numerals in the drawings:

[0018] 100. Speaker; 10. Mounting bracket; 11. Bracket body; 111. Installation cavity; 112. Opening; 12. Support part; 13. Bottom plate; 131. Air vent hole; 20. Magnetic circuit system; 21. Inner annular magnet assembly; 211. First annular magnet; 2111. First middle dividing surface; 212. Second annular magnet; 2121. Second middle dividing surface; 22. Outer annular magnet assembly; 221. Third annular magnet; 222. Fourth annular magnet; 20A. Annular gap; 21B. Air leakage channel; 30. Vibration system; 31. Diaphragm; 32. Skeleton; 33. Voice coil; 40. Support block.

[0019] The realization of the purpose, functional features and advantages of this application will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0020] To make the purpose, technical solutions and advantages of this application clearer, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0021] When the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with this application. On the contrary, they are only examples of devices and methods that are consistent with some aspects of this application as detailed in the appended claims.

[0022] In the description of this application, it should be understood that terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations. In addition, in the description of this application, unless otherwise stated, "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] Speakers, also known as "horns", are widely used in devices such as headphones or smart speakers. Their main function is to convert electrical signals into sound signals. The working principle of this type of speaker relies on the interaction between the constant magnetic field generated by the permanent magnet and the audio current passing through the voice coil, causing the voice coil and the connected diaphragm to vibrate, thereby converting electrical energy into sound wave energy and radiating it into the air.

[0025] However, under large-amplitude working conditions, the voice coil cannot provide sufficient driving force to make the diaphragm reach the expected vibration amplitude, which limits the sound output of the speaker, causing nonlinear deformation and distortion of the sound signal, thereby affecting the sound quality of the speaker.

[0026] To solve the above problems, please refer to Figures 1 to 4 In a first aspect of the present application, a loudspeaker 100 is proposed. In an embodiment of the present application, the loudspeaker 100 includes a mounting frame 10, a magnetic circuit system 20 and a vibration system 30.

[0027] As a supporting member in the speaker 100, the mounting frame 10 can not only provide stable support for components such as the magnetic circuit system 20 and the vibration system 30. At the same time, the magnetic circuit system 20 and the vibration system 30 are integrated and installed on the mounting frame 10, so that the speaker 100 can be installed as a whole during installation, thereby simplifying the overall installation process of the speaker 100 and improving the assembly efficiency and accuracy. The mounting frame 10 is provided with an installation cavity 111 and an opening 112 connected to the installation cavity, so that the installation cavity 111 can provide an installation space for the magnetic circuit system 20 and the vibration system 30, thereby improving the convenience of installation. The mounting frame 10 can be in the shape of a cylinder or a square body to adapt to different installation conditions. In terms of material selection, the mounting frame 10 is made of a material that does not generate magnetic poles under the action of a magnetic field, such as an aluminum alloy. Aluminum alloy not only has the characteristics of lightweight, effectively reduces the overall weight of the speaker 100, and is easy to carry and install, but also its high strength characteristics ensure the stability of the mounting frame 10 when subjected to vibration and impact, and prolongs the service life of the speaker 100.

[0028] The magnetic circuit system 20 is arranged in the installation cavity 111, and the magnetic circuit system 20 includes an inner annular magnet assembly 21 and an outer annular magnet assembly 22 which are spaced apart along the radial direction of the installation cavity 111. The outer annular magnet assembly 22 is located on the outside of the inner annular magnet assembly 21, and the inner annular surface of the outer annular magnet assembly 22 is spaced apart from the outer annular surface of the inner annular magnet assembly 21 to form an annular gap 20A, and the inner annular magnet assembly 21 and the outer annular magnet assembly 22 have different magnetic poles.

[0029] Specifically, a magnet has magnetism because there are a large number of magnetic moments (i.e., magnetic domains) inside it. These magnetic moments are disordered before magnetization. The magnetization process is to guide these small magnetic moments to gradually align in the same direction through the action of an external magnetic field, so that the magnet forms distinct magnetic properties. The outer contours of the inner annular magnet assembly 21 and the outer annular magnet assembly 22 arranged in a ring shape facilitate magnetization, so that the magnetic poles of the inner ring surface of the inner annular magnet assembly 21 and the outer ring surface of the outer annular magnet assembly 22 are different. For example, the inner ring surface of the inner annular magnet assembly 21 can be given an N pole, and the outer ring surface of the inner annular magnet assembly 21 corresponds to an S pole. Correspondingly, the inner ring surface of the outer annular magnet assembly 22 is an N pole, and the outer ring surface of the outer annular magnet assembly 22 is an S pole. In this way, a closed magnetic induction line loop starting from the inner ring surface of the outer annular magnet assembly 22, passing through the annular gap 20A, and finally pointing to the outer ring surface of the inner annular magnet assembly 21 is constructed, which not only optimizes the magnetic field distribution but also enhances the overall magnetic performance of the system.

[0030] The vibration system 30 is a key component in the speaker 100. It is responsible for converting electrical energy into mechanical vibrations and then generating sound. The vibration system 30 includes a diaphragm 31, a skeleton 32, and a voice coil 33. The diaphragm 31 is connected to the mounting frame 10 and covers the opening 112 of the mounting cavity 111. The diaphragm 31, as the front-end part of the vibration system 30, is directly in contact with the sound propagation medium (such as air). It is usually circular or conical, and such a shape design helps to evenly radiate sound waves in all directions during vibration, improving the directivity and clarity of the sound. The materials of the diaphragm 31 include paper, plastic, metal alloy, and composite materials, etc.

[0031] The skeleton 32 serves as a connecting bridge between the diaphragm 31 and the voice coil 33. The skeleton 32 is connected to the diaphragm 31. The skeleton 32 is usually in a ring shape or a frame shape. Such a design not only provides stable support for the voice coil 33 but also ensures the freedom and flexibility of the diaphragm 31 during vibration. The materials of the skeleton 32 include plastic, metal, and high-performance composite materials. It has a certain strength and rigidity to withstand the stress and vibration generated during the movement of the voice coil 33, and at the same time, it should be light enough to reduce the impact on the overall mass of the vibration system 30.

[0032] The voice coil 33 is a driving element in the vibration system 30. The voice coil 33 is connected to the bobbin 32, is in the axial direction of the installation cavity 111, and is placed within the annular gap 20A. The voice coil 33 is responsible for converting electrical energy into mechanical energy to drive the diaphragm 31 to vibrate. The voice coil 33 is usually annular and wound around the bobbin 32. The annular design enables the voice coil 33 to be more evenly affected by the magnetic force when energized, thereby achieving smoother and more stable vibration. The materials of the voice coil 33 include copper, aluminum, and alloy materials to have good electrical conductivity and heat resistance to ensure stability and reliability even under long-term high-load operation. In addition, the voice coil 33 is correspondingly located in the middle of the inner annular magnet assembly 21 and the middle of the outer annular magnet assembly 22.

[0033] Based on the loudspeaker 100 and the earphone of the embodiment of the present application, by arranging the inner annular magnet assembly 21 and the outer annular magnet assembly 22 at intervals in the radial direction of the installation cavity 111, and leaving an annular gap 20A between the inner ring surface of the outer annular magnet assembly 22 and the outer ring surface of the inner annular magnet assembly 21, and the magnetic poles of the two are different, so as to form a magnetic path trend distributed in the radial direction of the installation cavity 111. At the same time, the voice coil 33 is located within the annular gap 20A and is correspondingly located in the middle of the inner annular magnet assembly 21 and the middle of the outer annular magnet assembly 22. Thus, when the voice coil 33 reciprocates in the axial direction of the installation cavity 111, the entire voice coil 33 is completely located in the magnetic field. This ensures that the voice coil 33 can obtain a stable and sufficient driving force (i.e., Lorentz force) during vibration. Even under large-amplitude working conditions, it can reduce the non-linear deformation caused by insufficient or excessive driving force, make the conversion of sound signals smoother and more accurate, reduce the occurrence of non-linear distortion, and thus improve the sound quality performance of the loudspeaker 100.

[0034] In some structural forms, the inner annular magnet assembly 21 includes a first annular magnet 211 and a second annular magnet 212 connected to each other. The first annular magnet 211 and the second annular magnet 212 are coaxial and spaced apart. The outer annular magnet assembly 22 includes a third annular magnet 221 and a fourth annular magnet 222 connected to each other. The third annular magnet 221 and the fourth annular magnet 222 are coaxial and spaced apart. Among them, the third annular magnet 221 is located outside the first annular magnet 211, the fourth annular magnet 222 is located outside the second annular magnet 212, one end of the voice coil 33 is arranged corresponding to the side of the first annular magnet 211 close to the second annular magnet 212, and the other end of the voice coil 33 is arranged corresponding to the side of the second annular magnet 212 close to the first annular magnet 211.

[0035] Combined with reference to Figure 5, according to the above settings, the magnetic field intensity of the voice coil 33 changes with its vibration position will be greater than that at the initial position, so that the driving force (i.e., the Lorentz force) of the voice coil 33 during vibration gradually increases, further improving the sound quality performance of the speaker 100. It should be noted that this application is not limited to the combination of four annular magnets. The number of the inner annular magnet assembly 21 and the outer annular magnet assembly 22 can be flexibly expanded according to specific requirements, as long as the two are correspondingly arranged, that is, the outer side of the inner layer magnet is always correspondingly located inside the outer layer magnet to maintain a stable magnetic field environment.

[0036] Furthermore, in the axial direction of the installation cavity 111, the first annular magnet 211 has a first middle dividing surface 2111, the second annular magnet 212 has a second middle dividing surface 2121, and the voice coil 33 is located between the first middle dividing surface 2111 and the second middle dividing surface 2121. It should be noted that the "first middle dividing surface 2111" refers to the central plane of this first annular magnet 211 in the axial direction, which exactly divides the first annular magnet 211 into two parts in the axial direction. Similarly, the "second middle dividing surface 2121" divides the first annular magnet 211 into two parts in the axial direction. Therefore, the voice coil 33 is arranged between this first middle dividing surface 2111 and the second middle dividing surface 2121 to be affected by a uniform magnetic field, so as to achieve effective vibration and sound generation.

[0037] Referring to Figures 2 to 4 , in some structural forms, the speaker 100 further includes a support block 40, and the support block 40 is supported between the first annular magnet 211 and the second annular magnet 212 to space the first annular magnet 211 and the second annular magnet 212 apart.

[0038] Specifically, the setting of the support block 40 ensures that the first annular magnet 211 and the second annular magnet 212 can maintain a certain distance. If the inner annular magnet assembly 21 is too close, it may cause magnetic field interference, reduce the magnetic field efficiency, and thus affect the clarity and loudness of the sound. The support block 40 serves as a "buffer zone", effectively avoiding this situation and ensuring the stability and efficiency of the magnetic field. Secondly, from the perspective of the mechanical structure stability, the support block 40 enhances the overall stability of the speaker 100. During the operation of the speaker 100, the voice coil 33 will be affected by a rapidly changing magnetic field force and vibrate at a high speed. If this vibration lacks sufficient support, it may cause the relative positions of the first annular magnet 211 and the second annular magnet 212 to shift, thereby affecting the sound restoration and sound quality. The support block 40 is firmly supported between the first annular magnet 211 and the second annular magnet 212, effectively preventing the position shift of the first annular magnet 211 and the second annular magnet 212 caused by vibration, and ensuring the stability and durability of the speaker 100.

[0039] Furthermore, the orthographic projection of at least one of the first annular magnet 211 or the second annular magnet 212 along the axial direction of the installation cavity 111 covers the orthographic projection of the support block 40 along the axial direction of the installation cavity 111. In this way, any edge of the support block 40 will not exceed the outer limit of the first annular magnet 211 or the second annular magnet 212, thereby effectively reducing the collision between the voice coil 33 and the support block 40 during the vibration process, thereby ensuring that the voice coil 33 can vibrate freely and unimpeded, and also improving the overall performance and sound quality of the speaker 100.

[0040] Optionally, the support block 40 is arranged in an annular shape and extends along the circumference of the first annular magnet 211. In this way, the support block 40 is similar in shape to the first annular magnet 211, so that the contact area with the first annular magnet 211 can be increased to improve the support stability. It should be noted that when the support block 40 can be a whole continuous, uninterrupted annular structure, the integrity of the support block 40 is stronger, and a more uniform supporting force can be provided, reducing stress concentration or vibration interference caused by splicing gaps, reducing the number of parts in the assembly process, simplifying the assembly process, improving production efficiency, and avoiding the degradation of acoustic performance caused by small gaps or unevenness that may exist between the spliced parts. Alternatively, the support block 40 can also be formed by splicing multiple monomers into an annular block, which is convenient for local adjustment or replacement of the support block 40 to improve the maintainability of the speaker 100.

[0041] Reference Figures 2 to 4 In some structural forms, the mounting frame 10 includes a frame body 11 and a bottom plate 13. The frame body 11 is provided with a mounting cavity 111, the edge of the diaphragm 31 is connected to the frame body 11, and the bottom plate 13 is connected to the end of the frame body 11 away from the diaphragm 31. The bottom plate 13 can be fixed to the frame body 11 by means of screws or snaps, etc., to facilitate subsequent disassembly and maintenance. The outer circumference of the third annular magnet 221 and the outer circumference of the fourth annular magnet 222 are in contact with the inner wall of the frame body 11, so that the third annular magnet 221 and the fourth annular magnet 222 are limited by the frame body 11 to improve the stability of the third annular magnet 221 and the fourth annular magnet 222 after installation, thereby ensuring the stability of the magnetic field, and ensuring the stability and durability of the speaker 100.

[0042] Furthermore, the mounting bracket 10 further includes a support portion 12. The support portion 12 is connected to the bracket body 11 and is supported between the third annular magnet 221 and the fourth annular magnet 222, so that the third annular magnet 221 and the fourth annular magnet 222 are arranged at intervals. Wherein, the support portion 12 and the bracket body 11 can be an integral structure, so as to ensure the structural strength of the support outer annular magnet assembly 22. At the same time, the support portion 12 can be arranged in a ring shape along the circumference of the installation cavity 111 of the bracket body 11 to increase the contact area with the third annular magnet 221 and the fourth annular magnet 222, so as to further improve the support stability. By making the support portion 12 located between the third annular magnet 221 and the fourth annular magnet 222, acting as a stable bridge between them, ensuring that the third annular magnet 221 and the fourth annular magnet 222 can maintain an appropriate interval, thereby maintaining the balance and stability of the magnetic field, effectively preventing the position shift of the outer annular magnet assembly 22 caused by vibration, and ensuring the stability and durability of the speaker 100.

[0043] Furthermore, the orthographic projection of at least one of the third annular magnet 221 and the fourth annular magnet 222 along the axial direction of the installation cavity 111 covers the orthographic projection of the support portion 12 along the axial direction of the installation cavity 111. In this way, any edge of the support portion 12 will not exceed the inner boundary of the third annular magnet 221 and the fourth annular magnet 222, so that it can effectively reduce the collision between the voice coil 33 and the support during vibration, and further ensure that the voice coil 33 can vibrate freely without obstruction, and also improve the overall performance and sound quality performance of the speaker 100.

[0044] Referring to Figures 2 to 4 , optionally, the bottom plate 13 is provided with an air vent 131 communicating with the outside world, and an air leakage channel 21B is formed between the inner ring surface of the first annular magnet and the inner ring surface of the second annular magnet. The air leakage channel 21B communicates with the air vent 131. In this way, the setting of the air leakage channel 21B effectively relieves the internal pressure accumulation on the one hand, and prevents the performance attenuation or damage that may be caused by too high airtightness. On the other hand, appropriate air leakage can also subtly adjust the acoustic response and bring a more delicate and balanced performance to the sound quality. In addition, by directly forming the air leakage channel 21B from the inner ring surface of the first annular magnet 211 and the inner ring surface of the second annular magnet 212, the cumbersome steps of separately opening the air leakage channel 21B on the first annular magnet 211 and the second annular magnet 212 are avoided, and the overall structure of the speaker 100 is simplified.

[0045] In some structural forms, along the radial direction of the installation cavity 111, the distance between the voice coil 33 and the inner ring surface of the outer annular magnet assembly 22 is equal to the distance between the voice coil 33 and the outer ring surface of the inner annular magnet assembly 21. Such a balanced gap distribution helps to achieve harmonious resonance of sound vibration, reducing sound pressure fluctuations or phase distortion that may be caused by inconsistent distances. It ensures that the voice coil 33 can be evenly stressed in the magnetic field, thereby emitting a more stable audio signal.

[0046] This application also proposes an electronic device, which can be an earphone, audio glasses, a speaker, etc. The electronic device includes a housing and a speaker. The speaker is arranged inside the housing and is fixedly connected to the housing. The specific connection method of the speaker and the housing is not limited here and can be common screw connection, glue connection, welding, snap connection, etc. in the art. The housing has a sound outlet hole to transmit the sound emitted by the speaker to the external environment through the sound outlet hole. The specific structure of the speaker refers to the above embodiments. Since this earphone adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0047] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of this application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0048] The above are only the preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A loudspeaker, characterized in that, Comprising: A mounting bracket, provided with a mounting cavity and an opening communicating with the mounting cavity; A magnetic circuit system, disposed in the mounting cavity, the magnetic circuit system includes an inner annular magnet assembly and an outer annular magnet assembly spaced apart in the radial direction of the mounting cavity, the outer annular magnet assembly is located outside the inner annular magnet assembly, an annular gap is formed between the inner ring surface of the outer annular magnet assembly and the outer ring surface of the inner annular magnet assembly, and the inner annular magnet assembly and the outer annular magnet assembly have opposite magnetic poles; and A vibration system, the vibration system includes a diaphragm, a skeleton and a voice coil, the diaphragm is connected to the mounting bracket and covers the opening of the mounting cavity, the skeleton is connected to the diaphragm and the voice coil, so that the voice coil is located in the annular gap and corresponds to the middle parts of the inner annular magnet assembly and the outer annular magnet assembly.

2. The loudspeaker according to claim 1, characterized in that, The inner annular magnet assembly includes a first annular magnet and a second annular magnet connected to each other, the first annular magnet and the second annular magnet are coaxial and spaced apart; the outer annular magnet assembly includes a third annular magnet and a fourth annular magnet connected to each other, the third annular magnet and the fourth annular magnet are coaxial and spaced apart; Wherein, the third annular magnet is located outside the first annular magnet, the fourth annular magnet is located outside the second annular magnet, one end of the voice coil is arranged corresponding to the side of the first annular magnet close to the second annular magnet, and the other end of the voice coil is arranged corresponding to the side of the second annular magnet close to the first annular magnet.

3. The loudspeaker according to claim 2, characterized in that, In the axial direction of the mounting cavity, the first annular magnet has a first middle plane, the second annular magnet has a second middle plane, and the voice coil is located between the first middle plane and the second middle plane.

4. The loudspeaker according to claim 2, characterized in that, The loudspeaker further includes a support block, the support block is supported between the first annular magnet and the second annular magnet, so that the first annular magnet and the second annular magnet are spaced apart.

5. The loudspeaker according to claim 4, characterized in that, The positive projection of the first annular magnet and / or the second annular magnet in the axial direction of the mounting cavity covers the positive projection of the support block in the axial direction of the mounting cavity.

6. The loudspeaker according to claim 2, characterized in that, The mounting bracket includes a bracket body and a bottom plate, the bracket body is provided with the mounting cavity, the edge of the diaphragm is connected to the bracket body, the outer peripheral surfaces of the third annular magnet and the fourth annular magnet are in contact with the inner wall of the bracket body, and the bottom plate is connected to one end of the bracket body away from the diaphragm.

7. The loudspeaker according to claim 6, characterized in that, The mounting bracket further includes a support portion, the support portion is connected to the bracket body, and the support portion is supported between the third annular magnet and the fourth annular magnet, so that the third annular magnet and the fourth annular magnet are spaced apart.

8. The loudspeaker according to claim 7, characterized in that, The positive projection of the third annular magnet and the fourth annular magnet in the axial direction of the mounting cavity covers the positive projection of the support portion in the axial direction of the mounting cavity.

9. The loudspeaker according to claim 6, wherein, The bottom plate is provided with an air leakage hole communicating with the outside, and an air leakage channel is formed between the inner ring surface of the first annular magnet and the inner ring surface of the second annular magnet, and the air leakage channel communicates with the air leakage hole.

10. The loudspeaker according to any one of claims 1 to 9, characterized in that, In the radial direction of the installation cavity, the distance between the voice coil and the inner ring surface of the outer annular magnet assembly is equal to the distance between the voice coil and the outer ring surface of the inner annular magnet assembly.

11. An electronic device, characterized in that, Comprising a housing and a loudspeaker according to any one of claims 1 to 10, the loudspeaker being disposed inside the housing.

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