Acoustic device and electronic apparatus

Abstract

The invention belongs to the technical field of electroacoustic conversion, and particularly relates to an acoustic device and electronic equipment, the acoustic device comprises a vibration system and a magnetic circuit system, and the vibration system comprises a diaphragm assembly and a voice coil which are connected; the magnetic circuit system comprises a magnetic conductive yoke, and a central magnetic part and an edge magnetic part which are arranged on the same side surface of the magnetic conductive yoke; the edge magnetic part is annularly arranged on the central magnetic part and forms a magnetic gap for the voice coil to extend in with the central magnetic part; the central magnetic part comprises a first central magnet, a second central magnet and a central magnetic conductive plate; the edge magnetic part comprises a first edge magnet, a second edge magnet and an edge magnetic conducting plate; the magnetizing directions of the first center magnet and the first side magnets are inclined relative to the vibration direction of the vibrating diaphragm assembly; the magnetizing direction of the second center magnet and the magnetizing direction of the second side magnet are perpendicular to the vibration direction. According to the structure, the BL value of the acoustic device can be improved, distortion is reduced, and the acoustic performance of the acoustic device is improved.

Description

Technical Field

[0001] This invention belongs to the field of electroacoustic conversion technology, and specifically relates to an acoustic device and electronic device. Background Technology

[0002] Blur performance (BL) is crucial for the development of many current electroacoustic technologies. It is one of the core parameters for measuring the electroacoustic conversion efficiency of a loudspeaker, directly affecting its sensitivity, sound quality, and power handling capabilities. Currently, one of the technological challenges is the contradiction between miniaturization and high performance. The stringent internal space requirements of equipment limit the size of the magnetic circuit, making it difficult to achieve high BL performance. Therefore, how to improve the BL performance of acoustic devices within limited space is a pressing technical problem that needs to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide an acoustic device and an electronic device to at least partially solve the above-mentioned technical problems.

[0004] This invention provides an acoustic device, comprising: A vibration system, including a connected diaphragm assembly and a voice coil; A magnetic circuit system includes a magnetic yoke and a central magnetic portion and a side magnetic portion disposed on the same side of the magnetic yoke. The side magnetic portion is disposed around the central magnetic portion and forms a magnetic gap with it into which the voice coil can extend. The central magnetic portion includes a first central magnet, a second central magnet, and a central magnetic guide plate. The second central magnet and the central magnetic guide plate are distributed along the radial direction of the magnetic circuit system and are both stacked on top of the first central magnet. The second central magnet is located on the side of the central magnetic guide plate away from the magnetic gap. The side magnetic portion includes a first side magnet, a second side magnet, and a side magnetic guide plate. The second side magnet and the side magnetic guide plate are distributed along the radial direction of the magnetic circuit system and are both stacked on top of the first side magnet. The second side magnet is located on the side of the side magnetic guide plate away from the magnetic gap. The magnetization directions of the first central magnet and the first side magnet are inclined relative to the vibration direction of the diaphragm assembly, and the polarities of the magnetic poles at the ends away from the magnetic yoke are opposite. The magnetization directions of the second central magnet and the second side magnet are perpendicular to the vibration direction, and the polarity of the magnetic pole of the second central magnet facing the central magnetic plate is the same as the polarity of the magnetic pole of the first central magnet at the end away from the magnetic yoke. The polarity of the magnetic pole of the second side magnet facing the side magnetic plate is the same as the polarity of the magnetic pole of the first side magnet at the end away from the magnetic yoke.

[0005] The acoustic device provided by this invention may also have the following additional technical features: In one specific embodiment of the present invention, the magnetization direction of the first central magnet and the first side magnet is tilted at an angle greater than 0° and less than or equal to 54° relative to the vibration direction of the diaphragm assembly.

[0006] In one specific embodiment of the present invention, the magnetization direction of the first central magnet and the first side magnet is tilted at an angle of 18° relative to the vibration direction of the diaphragm assembly.

[0007] In one specific embodiment of the present invention, the width ratio of the side magnetic plate and the second side magnet is 1:(0.5-4) along the radial direction of the magnetic circuit system.

[0008] In one specific embodiment of the present invention, the width ratio of the side magnetic plate and the second side magnet is 1:1 along the radial direction of the magnetic circuit system.

[0009] In one specific embodiment of the present invention, the first central magnet includes a plurality of magnets and is spaced apart along the circumferential direction of the magnetic circuit system, and the central magnetic plate and the second central magnet include a plurality of magnets and are arranged corresponding to the first central magnet.

[0010] In one specific embodiment of the present invention, the magnetic gap is rectangular and annular, the first central magnet includes a pair of first sub-magnets disposed corresponding to the long side of the magnetic gap and a pair of second sub-magnets disposed corresponding to the short side of the magnetic gap; the central magnetic guide plate includes a first central magnetic guide plate disposed on the first sub-magnets and a second central magnetic guide plate disposed on the second sub-magnets; wherein the first central magnetic guide plate and the second central magnetic guide plate are integrally formed or separately disposed; And / or, the first central magnet comprises four, each of which is generally triangular prism in shape and forms a rectangle.

[0011] In one specific embodiment of the present invention, the acoustic device further includes a housing, one side of the housing is connected to the diaphragm assembly along the axial direction of the housing, and the other side of the housing is connected to the edge magnet portion.

[0012] In one specific embodiment of the present invention, the diaphragm assembly includes a vibrating plate and a diaphragm circumferentially disposed on the vibrating plate, the outer edge of the diaphragm being connected to the housing, one end of the voice coil being connected to the vibrating plate, and the other end extending into the magnetic gap.

[0013] A second aspect of the present invention also provides an electronic device comprising the acoustic device described in any one of the foregoing claims.

[0014] The acoustic device provided in this embodiment of the invention allows for adjustment of the direction of the magnetic field lines by adjusting the magnetization direction of the first central magnet and the first side magnet in the central magnetic part and the side magnetic part. This adjustment, in turn, regulates the density distribution of the magnetic field lines in the magnetic gap, increasing the flow density of the magnetic field lines near the vibrating system end of the magnetic gap. This increases the number of magnetic field lines cut by the voice coil during a single vibration, thereby enhancing the black-white (BL) performance of the acoustic device. Simultaneously, by adding a second side magnet and a second central magnet, the magnet volume can be increased without changing the overall volume of the magnetic circuit system, thereby increasing the magnetic field strength. This further enhances the BL performance of the acoustic device, reduces distortion, and improves its acoustic performance. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of the acoustic device in an embodiment of the present invention; Figure 2 This is an exploded view of the acoustic device in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the acoustic device in an embodiment of the present invention from another perspective.

[0017] Explanation of reference numerals in the attached figures: 100 - Acoustic device; 10-Shell; 20-Vibration system, 21-Diaphragm assembly, 22-Diaphragm, 23-Vosifying plate, 24-Voice coil; 30-Magnetic circuit system, 31-Magnetic yoke, 32-Central magnetic part, 33-First central magnet, 331-First sub-magnet, 332-Second sub-magnet, 34-Central magnetic plate, 342-First central magnetic plate, 341-Second central magnetic plate, 35-Second central magnet, 36-Side magnetic part, 37-First side magnet, 38-Side magnetic plate, 39-Second side magnet. Detailed Implementation

[0018] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0019] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0020] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0021] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0022] Reference Figure 1-3This invention provides an acoustic device 100, including a vibration system 20 and a magnetic circuit system 30. The vibration system 20 includes a diaphragm assembly 21 and a voice coil 24 connected to each other. The magnetic circuit system 30 includes a magnetic yoke 31 and a central magnetic portion 32 and a side magnetic portion 36 disposed on the same side of the magnetic yoke 31. The side magnetic portion 36 is disposed around the central magnetic portion 32 and forms a magnetic gap with it into which the voice coil 24 can extend. The central magnetic portion 32 includes a first central magnet 33, a second central magnet 35, and a central magnetic guide plate 34. The second central magnet 35 and the central magnetic guide plate 34 are distributed along the radial direction of the magnetic circuit system 30 and are both stacked on the first central magnet 33. The second central magnet 35 is located on the side of the central magnetic guide plate away from the magnetic gap. The side magnetic portion 36 includes a first side magnet 37, a second side magnet 39, and a side magnetic guide plate 34. The magnetic guide plate 38, the second side magnet 39, and the side magnetic guide plate 38 are distributed along the radial direction of the magnetic circuit system 30 and are all stacked on the first side magnet 37, and the second side magnet 39 is located on the side of the side magnetic guide plate away from the magnetic gap; wherein the magnetization direction of the first central magnet 33 and the first side magnet 37 is inclined relative to the vibration direction of the diaphragm assembly 21, and the polarity of the magnetic poles at the ends away from the magnetic guide yoke is opposite; the magnetization direction of the second central magnet 35 and the second side magnet 39 is perpendicular to the vibration direction, and the polarity of the magnetic pole at the end of the second central magnet 35 facing the central magnetic guide plate is the same as the polarity of the magnetic pole at the end of the first central magnet 33 away from the magnetic guide yoke 31, and the polarity of the magnetic pole at the side of the second side magnet 39 facing the side magnetic guide plate is the same as the polarity of the magnetic pole at the end of the first side magnet 37 away from the magnetic guide yoke 31.

[0023] Specifically, the acoustic device 100 also includes a housing 10, which is generally formed as a rectangular frame structure. The magnetic circuit system 30 and the vibration system 20 are respectively connected to the two sides of the housing 10 along the axial direction, so as to be housed within the housing 10.

[0024] The vibration system 20 includes a diaphragm assembly 21 and a voice coil 24. The diaphragm assembly 21 includes a diaphragm 23 and a diaphragm 22 connected to the outer periphery of the diaphragm 23. The outer periphery of the diaphragm 22 is connected to the housing 10. The voice coil 24 is disposed on the side of the vibration system 20 facing the magnetic circuit system 30, with one end connected to the diaphragm 22 and the other end located inside the housing 10.

[0025] The magnetic circuit system 30 includes a magnetic yoke 31, a central magnetic part 32, and a side magnetic part 36. The magnetic yoke 31 is connected to the side of the housing 10 relative to the vibration system 20. The central magnetic part 32 and the side magnetic part 36 are both disposed on the side of the magnetic yoke 31 facing the vibration system 20. The central magnetic part 32 is located at the center of the magnetic yoke 31, and the side magnetic part 36 is disposed on the periphery of the central magnetic part 32, forming a magnetic gap with it into which the end of the voice coil 24 can extend.

[0026] The central magnetic section 32 includes a first central magnet 33, a second central magnet 35, and a central magnetic guide plate 34. The first central magnet 33 is fixed to the magnetic yoke 31. The second central magnet 35 and the central magnetic guide plate 34 are both fixed to the side of the first central magnet 33 facing the vibration system 20 and distributed along the radial direction of the magnetic circuit system. The second central magnet 35 is correspondingly disposed in the central region of the central magnetic section, and the central magnetic guide plate 34 is arranged around the second central magnet and adjacent to the magnetic gap.

[0027] The side magnetic part 36 includes a first side magnet 37, a second side magnet 39, and a side magnetic guide plate 38. The first side magnet 37 is fixed to the magnetic yoke 31. The second side magnet 39 and the side magnetic guide plate 38 are both fixed to the side of the first side magnet 37 facing the vibration system 20. The side magnetic guide plate 38 is arranged adjacent to the magnetic gap, and the second side magnet 39 is arranged around the side magnetic guide plate 38.

[0028] The magnetization directions of the first central magnet 33 and the first side magnet 37 are inclined relative to the vibration direction of the diaphragm assembly 21, and the polarities of the magnetic poles at the ends away from the magnetic yoke 31 are opposite. The magnetization directions of the second central magnet 35 and the second side magnet 39 are perpendicular to the vibration direction, and the polarity of the magnetic pole at the end of the second central magnet 35 facing the central magnetic plate is the same as the magnetic pole at the end of the first central magnet 33 away from the magnetic yoke 31. The polarity of the magnetic pole on the side of the second side magnet 39 facing the side magnetic plate is the same as the polarity of the magnetic pole at the end of the first side magnet 37 away from the magnetic yoke 31.

[0029] Adjusting the magnetization direction of the first central magnet 33 and the first side magnet 37 can adjust the direction of the magnetic field lines, thereby regulating the density distribution of the magnetic field lines in the magnetic gap. This increases the flow density of the magnetic field lines near the vibrating system 20 end of the magnetic gap, increasing the number of magnetic field lines cut by the voice coil 24 during a single vibration, thus enhancing the black-white performance (BL) of the acoustic device 100. The placement of the second central magnet 35 and the second side magnet 39 increases the magnet volume without changing the overall volume of the magnetic circuit system 30, thereby increasing the magnetic field strength and further enhancing the BL performance of the acoustic device 100. Simultaneously, the second central magnet 35 and the second side magnet 39 can further concentrate the magnetic field lines towards the voice coil 24.

[0030] The acoustic device 100 provided in this embodiment of the invention adjusts the magnetization direction of the first central magnet 33 and the first side magnet 37 in the central magnetic part 32 and the side magnetic part 36, thereby adjusting the direction of the magnetic field lines and thus regulating the density distribution of the magnetic field lines in the magnetic gap. This increases the density of the magnetic field lines near the vibrating system 20 end of the magnetic gap, increasing the number of magnetic field lines cut by the voice coil 24 during a single vibration, thereby increasing the black-white performance (BL) of the acoustic device 100. At the same time, by adding a second side magnet 39 and a second central magnet 35, not only can the magnet volume be increased without changing the overall volume of the magnetic circuit system 30, but the magnetic field lines can also be further concentrated towards the voice coil 24, thereby increasing the magnetic field strength. This further increases the BL performance of the acoustic device 100, thereby reducing the distortion of the acoustic device 100 and improving its acoustic performance.

[0031] Of course, the acoustic device 100 may not have a separate housing 10. Instead, it can be integrally bent using the side magnetic plate 38 of the magnetic circuit system 30 and connected to the edge of the diaphragm assembly 21 of the vibration system 20. This is not a limitation.

[0032] In some embodiments, the magnetization direction of the first central magnet 33 and the first side magnet 37 is tilted at an angle greater than 0° and less than or equal to 54° relative to the vibration direction of the diaphragm assembly 21.

[0033] For example, the angle between the magnetization direction of the first central magnet 33 and the vibration direction of the first side magnet 37 is any angle between 0° and 54°, such as 5°, 10°, 12°, 15°, 18°, 20°, 25°, 30°, 35°, 38°, 40°, 45°, 48°, 50°, 54°, etc.

[0034] This embodiment improves the design freedom of the first central magnet 33 and the first side magnet 37 through the above-described settings, thereby facilitating their cooperation with other components to systematically optimize the performance and reliability of the acoustic device.

[0035] In some embodiments, the magnetization direction of the first central magnet 33 and the first side magnet 37 is tilted at an angle of 18° relative to the vibration direction of the diaphragm assembly 21. When the tilt angle is 18°, the improvement in BL reaches its peak, and compared to a scheme without a second central magnet 35 and a second side magnet 39 and with the central and side magnets vertically magnetized, the maximum BL value in this embodiment is increased by 11.07%, thereby optimizing the performance of the acoustic device 100 based on the tilt of the magnetization direction of the magnetic circuit system 30.

[0036] In some embodiments, the width ratio of the side magnetic plate 38 and the second side magnet 39 along the radial direction of the magnetic circuit system 30 is 1:(0.5-4).

[0037] It should be noted that when the magnetic circuit system 30 is rectangular, the radial direction of the magnetic circuit system 30 refers to the direction along the major axis or minor axis of the magnetic circuit system 30. When the magnetic circuit system 30 is circular, the radial direction of the magnetic circuit system 30 refers to the direction along the diameter of the magnetic circuit system 30.

[0038] For example, the ratio of the side magnetic plate 38 to the second side magnet 39 is any ratio between 1: (0.5-4), such as 1:0.5, 1:1, 1:2, 1:3, 1:4, etc., and the width ratio of the side magnetic plate 38 to the second side magnet 39 along the major or minor axis of the magnetic circuit system 30 is 1:1.

[0039] The width-to-width ratio of the aforementioned side magnetic plate 38 and the second side magnet 39 further increases the design freedom of the magnetic circuit system 30, thereby facilitating its integration with other components to systematically optimize the performance and reliability of the acoustic device 100.

[0040] In some embodiments, the first central magnet 33 is a single magnet, or the first central magnet 33 may include multiple magnets and be spaced apart along the circumferential direction of the magnetic circuit system 30. The central magnetic guide plate 34 and the second central magnet 35 may be one or more magnets and may be arranged corresponding to the first central magnet 33.

[0041] In this embodiment, by setting multiple first central magnets 33, central magnetic guide plates 34, and second central magnets 35, the magnetization direction of the first central magnets 33 and the second central magnets 35 can be easily controlled, thereby enabling them to cooperate with the side magnetic part 36 to form a magnetic circuit passing through the voice coil 24. This can improve the distribution of corresponding magnetic field lines on each part of the annular magnetic gap, thereby increasing the performance of the acoustic device 100BL, reducing distortion, and improving the acoustic performance of the acoustic device 100.

[0042] In some embodiments, the magnetic gap is rectangular and annular, and the first central magnet 33 includes a pair of first sub-magnets 331 disposed on the long side of the magnetic gap and a pair of second sub-magnets 332 disposed on the short side of the magnetic gap; the central magnetic guide plate 34 includes a first central magnetic guide plate 342 disposed on the first sub-magnets 331 and a second central magnetic guide plate 341 disposed on the second sub-magnets 332.

[0043] Optionally, the first central magnetic plate 342 and the second central magnetic plate 341 can be an integrally formed structure or a separate structure. An integrally formed structure can enhance the connection strength and facilitate processing and manufacturing, while a separate structure saves materials and reduces costs.

[0044] Of course, in other embodiments, each first sub-magnet 331 is provided with two first central magnetic plates 342, which are spaced apart along their long sides. Specifically, the outer contours of the first sub-magnets 331 are approximately the same and symmetrically arranged, and they are also the same and symmetrically arranged as the second sub-magnets 332, forming a rectangle with the first sub-magnets 331 and the second sub-magnets 332. A clearance gap is formed between the two first central magnetic plates 342 stacked on the same first sub-magnet 331, thus avoiding other structures, such as the voice coil 24 leads.

[0045] In some embodiments, four first central magnets 33 are included, each generally being a triangular prism and forming a rectangle. The number of second central magnets 35 and the central magnetic guide plate is the same as that of the first central magnets 33, and their shapes are generally the same as those of the stacked first central magnets 33. In this way, the volume of the first central magnets 33, second central magnets 35, and central magnetic guide plate can be increased, maximizing the improvement of magnetic circuit performance.

[0046] Of course, in other embodiments, a pair of first central magnets 33 arranged opposite each other are formed in a trapezoidal shape, and another pair of first central magnets 33 arranged opposite each other are formed in a triangular shape.

[0047] The above-mentioned configuration further improves the design flexibility of the magnetic circuit system 30, thereby facilitating further improvements to the magnetic circuit system 30.

[0048] A second aspect of the present invention also provides an electronic device including the acoustic device 100 of any of the above embodiments. The structure of the acoustic device 100 is as described in the above embodiments. Since the electronic device in this embodiment includes the acoustic device 100 of all the above embodiments, it has at least the beneficial effects of the above embodiments, which will not be repeated here.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An acoustic device, characterized in that, include: A vibration system, including a connected diaphragm assembly and a voice coil; A magnetic circuit system includes a magnetic yoke and a central magnetic portion and a side magnetic portion disposed on the same side of the magnetic yoke. The side magnetic portion is disposed around the central magnetic portion and forms a magnetic gap with it into which the voice coil can extend. The central magnetic portion includes a first central magnet, a second central magnet, and a central magnetic guide plate. The second central magnet and the central magnetic guide plate are distributed along the radial direction of the magnetic circuit system and are both stacked on top of the first central magnet. The second central magnet is located on the side of the central magnetic guide plate away from the magnetic gap. The side magnetic portion includes a first side magnet, a second side magnet, and a side magnetic guide plate. The second side magnet and the side magnetic guide plate are distributed along the radial direction of the magnetic circuit system and are both stacked on top of the first side magnet. The second side magnet is located on the side of the side magnetic guide plate away from the magnetic gap. The magnetization directions of the first central magnet and the first side magnet are inclined relative to the vibration direction of the diaphragm assembly, and the polarities of the magnetic poles at the ends away from the magnetic yoke are opposite. The magnetization directions of the second central magnet and the second side magnet are perpendicular to the vibration direction, and the polarity of the magnetic pole of the second central magnet facing the central magnetic plate is the same as the polarity of the magnetic pole of the first central magnet at the end away from the magnetic yoke. The polarity of the magnetic pole of the second side magnet facing the side magnetic plate is the same as the polarity of the magnetic pole of the first side magnet at the end away from the magnetic yoke.

2. The acoustic device according to claim 1, characterized in that, The magnetization direction of the first central magnet and the first side magnet is tilted at an angle greater than 0° and less than or equal to 54° relative to the vibration direction of the diaphragm assembly.

3. The acoustic device according to claim 2, characterized in that, The magnetization direction of the first central magnet and the first side magnet is tilted at an angle of 18° relative to the vibration direction of the diaphragm assembly.

4. The acoustic device according to claim 1, characterized in that, Along the radial direction of the magnetic circuit system, the width ratio of the side magnetic plate and the second side magnet is 1:(0.5-4).

5. The acoustic device according to claim 4, characterized in that, Along the radial direction of the magnetic circuit system, the width ratio of the side magnetic plate and the second side magnet is 1:

1.

6. The acoustic device according to claim 1, characterized in that, The first central magnet includes multiple magnets and is spaced apart along the circumferential direction of the magnetic circuit system. The central magnetic plate and the second central magnet include multiple magnets and are arranged corresponding to the first central magnet.

7. The acoustic device according to claim 6, characterized in that, The magnetic gap is rectangular and annular. The first central magnet includes a pair of first sub-magnets disposed on the long side of the magnetic gap and a pair of second sub-magnets disposed on the short side of the magnetic gap. The central magnetic guide plate includes a first central magnetic guide plate disposed on the first sub-magnets and a second central magnetic guide plate disposed on the second sub-magnets. The first central magnetic guide plate and the second central magnetic guide plate are integrally formed or separately disposed. And / or, the first central magnet comprises four, each of which is generally triangular prism in shape and forms a rectangle.

8. The acoustic device according to claim 1, characterized in that, The acoustic device also includes a housing, with one side of the housing connected to the diaphragm assembly along the axial direction of the housing, and the other side of the housing connected to the edge magnet.

9. The acoustic device according to claim 8, characterized in that, The diaphragm assembly includes a vibrating plate and a diaphragm arranged around the vibrating plate. The outer edge of the diaphragm is connected to the housing. One end of the voice coil is connected to the vibrating plate, and the other end extends into the magnetic gap.

10. An electronic device, characterized in that, Includes the acoustic device according to any one of claims 1-9.

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