Acoustic device and electronic apparatus

Abstract

The utility model belongs to the technical field of electroacoustic conversion, and particularly relates to an acoustic device and electronic equipment, the acoustic device comprises a housing, and a vibration system and a magnetic circuit system accommodated in the housing, the magnetic circuit system comprises a central magnetic part and side magnetic parts, the side magnetic parts are arranged around the central magnetic part to form a magnetic gap with the central magnetic part, and the magnetic gap is formed between the side magnetic parts and the central magnetic part. A voice coil of the vibration system is at least partially inserted into the magnetic gap, the edge magnetic part comprises edge magnets, the edge magnets comprise a first magnet, a second magnet, a third magnet and a fourth magnet which are sequentially arranged in the circumferential direction, the two ends of the third magnet are connected with the second magnet and the fourth magnet respectively, and the first magnet, the second magnet and the second and fourth magnets are arranged at intervals. Based on the above structure, the acoustic device can still maintain a high tone quality effect under the condition that the thickness is reduced, and therefore the acoustic device can be applied to current electronic equipment with the reduced thickness to guarantee the tone quality effect of the electronic equipment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electroacoustic conversion technical field, and concretely relates to an acoustic device and electronic equipment. BACKGROUND

[0002] With the development of acoustic output technology, acoustic devices (such as loudspeakers) have been widely applied to people's life, which can be used with electronic devices such as mobile phones and computers to provide hearing function for users. However, with the development of thin and light electronic devices, the space in the electronic devices is getting smaller and smaller, and how to achieve the best sound effect in the effective space is a problem to be solved for acoustic devices.

[0003] Therefore, based on the above problems, the utility model is proposed. UTILITY MODEL CONTENT

[0004] The utility model aims at providing an acoustic device and electronic equipment to ensure the sound quality effect of the acoustic device in the case of reduced space.

[0005] The utility model provides an acoustic device in a first aspect, including shell and containing vibration system and magnetic circuit system in the shell, the magnetic circuit system includes center magnetic part and side magnetic part, the side magnetic part is annularly equipped around the four sides of the center magnetic part to form the magnetic gap with the center magnetic part, the voice coil of the vibration system is at least partially inserted into the magnetic gap, wherein

[0006] The side magnetic part includes side magnet, the side magnet includes the first magnet, the second magnet, the third magnet and the fourth magnet arranged in sequence in the circumference, the both ends of the third magnet are connected with the second magnet and the fourth magnet respectively, and the first magnet is arranged at intervals with the second magnet and the fourth magnet.

[0007] The acoustic device provided by the utility model can also have the following additional technical features:

[0008] In one specific embodiment of the utility model, the first air hole is located on one side of the first magnet, and the second air hole is located on one side of the third magnet, the first air hole is larger than the second air hole, the air resistance of the air flow passing through the air hole is adjusted, and the polarization of the voice coil is improved.

[0009] In one specific embodiment of the utility model, the shell includes two long axes and two short axes, the width of the third magnet is greater than the width of the first magnet along the long axis direction, the length of the third magnet is greater than the length of the first magnet along the short axis direction, and / or

[0010] The second magnet and the fourth magnet extend to the third magnet for a length greater than the length to the first magnet with reference to the line connecting the midpoints of the two long axes of the shell.

[0011] In one embodiment of the present application, the centering support sheet is located on the same side as the first magnet, and one end of the centering support sheet is connected to the shell and the other end is connected to the vibration system.

[0012] In one embodiment of the present application, the centering support sheet comprises a first connecting portion, a second connecting portion, and a vibration portion connected between the first connecting portion and the second connecting portion, the first connecting portion is connected to the shell, and the second connecting portion is connected to the vibration system.

[0013] The first connecting portion is provided with two first soldering pads, the second connecting portion is two, each of the second connecting portions is provided with one second soldering pad, each of the first soldering pads is electrically connected to one of the second soldering pads, and the two second soldering pads are respectively electrically connected to two lead ends of the voice coil.

[0014] In one embodiment of the present application, the magnetic circuit system further comprises a magnetic yoke, and the center magnetic portion and the at least four edge magnetic portions are arranged on the magnetic yoke.

[0015] In one embodiment of the present application, the shell is connected to the side of the edge magnetic portion away from the magnetic yoke.

[0016] In one embodiment of the present application, the edge magnetic portion further comprises a first magnetic guide plate, a second magnetic guide plate, a third magnetic guide plate and a fourth magnetic guide plate which are respectively arranged in layers on the first magnet, the second magnet, the third magnet and the fourth magnet, and the first magnetic guide plate and the third magnetic guide plate are symmetrically arranged.

[0017] In one embodiment of the present application, the shell is further provided with a connecting column, the connecting column is located at two ends of the first magnet, and the connecting column is connected to the magnetic yoke.

[0018] The second aspect of the present application further provides an electronic device comprising the acoustic device of any one of the above.

[0019] The acoustic device provided by the utility model overcomes the inherent thought that the vibration main body of the traditional loudspeaker usually adopts symmetrical magnetic field, through making the two ends of the third magnet in the side magnetic part connect with the second magnet and the fourth magnet respectively, and the first magnet is arranged in interval with the second magnet and the fourth magnet, thereby increasing the effective magnetic field length for driving the voice coil vibration in the magnetic circuit system, that is, improving the dynamic coefficient (BL) of the voice coil, thereby being capable of improving the sound quality effect of the acoustic device. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 It is the front view of the acoustic device in the embodiment of the utility model;

[0022] Figure 2 It is the structure explosion map of Figure 1 ;

[0023] Figure 3 It is the partial structure schematic view of the acoustic device in the embodiment of the utility model, wherein the magnetic yoke of the magnetic circuit system is removed in the drawing;

[0024] Figure 4 It is the cross section structure schematic view of the acoustic device in the embodiment of the utility model;

[0025] Figure 5 It is the back view of the acoustic device in the embodiment of the utility model.

[0026] EXPLANATION OF REFERENCE NUMERALS:

[0027] 100-acoustic device;

[0028] 10-housing;

[0029] 20-vibration system, 21-diaphragm assembly, 211-diaphragm, 212-vibration plate;22-voice coil, 23-centering web, 231-first connecting part, 232-second connecting part, 233-vibration part, 234-first solder pad, 235-second solder pad;

[0030] 30 - magnetic circuit system, 31 - magnetic yoke, 32 - central magnetic part, 321 - central magnet, 322 - central magnetic conducting plate, 33 - first magnetic part, 331 - first magnet, 332 - first magnetic conducting plate, 34 - second magnetic part, 341 - second magnet, 342 - second magnetic conducting plate, 35 - third magnetic part, 351 - third magnet, 352 - third magnetic conducting plate, 36 - fourth magnetic part, 361 - fourth magnet, 362 - fourth magnetic conducting plate. DETAILED DESCRIPTION

[0031] Example embodiments of the present application will be described herein below with reference to the accompanying drawings. While example embodiments of the present application are illustrated, it is to be understood that the present application is not limited to the illustrated embodiments. Rather, the present application is to be accorded a full scope as defined by the appended claims, and equivalents thereof. Various forms of the present application will become apparent to one of ordinary skill upon examination of the following description.

[0032] It should be understood that the terms used herein are for the purpose of describing particular example embodiments and are not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and / or "comprising," and / or "includes" and / or "including" and / or "has" and / or "having" and / or "contain" and / or "containing" as used herein, are inclusive, and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0033] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to differentiate one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0034] For the sake of description, spatial relative terms can be used herein for the purpose of describing one element or feature's relationship to another element or feature as illustrated in the figures. Such relative terms include, for example, "internal," "external," "inner side," "outer side," "underneath," "below," "above," "on," and the like. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0035] The utility model discloses a kind of acoustic devices 100, which is used for electronic equipment, and provides hearing function for electronic equipment, and can guarantee its tone quality effect in the case where electronic equipment thickness is thinned.

[0036] With reference Figures 1 to 5 The acoustic device 100 provided by the embodiments of the utility model includes a shell 10, a vibration system 20 accommodated in the shell 10, and a magnetic circuit system 30. The magnetic circuit system 30 includes a central magnetic part 32 and a peripheral magnetic part. The peripheral magnetic part is arranged around the central magnetic part 32 to form a magnetic gap with the central magnetic part 32. The voice coil 22 of the vibration system 20 is at least partially inserted into the magnetic gap. The peripheral magnetic part includes peripheral magnets, which include a first magnet 331, a second magnet 341, a third magnet 351, and a fourth magnet 361 arranged in sequence in the circumferential direction. The two ends of the third magnet 351 are connected to the second magnet 341 and the fourth magnet 361, respectively. The first magnet 331 is arranged apart from the second magnet 341 and the fourth magnet 361.

[0037] Specifically, the shell 10 forms a hollow frame structure, which has a first side and a second side arranged opposite to each other along the axial direction. The vibration system 20 is connected to the first side, and the magnetic circuit system 30 is connected to the second side. In this way, the magnetic circuit system 30 is arranged correspondingly to the vibration system 20 and can drive the vibration system 20 to vibrate along the axial direction of the shell 10 to produce sound.

[0038] In the magnetic circuit system 30, the central magnetic part 32 is located at the center, and the peripheral magnetic part is arranged around the outer periphery of the central magnetic part 32. In this way, the central magnetic part 32 and the peripheral magnetic part form a magnetic gap filled with a magnetic field.

[0039] The vibration system 20 comprises a diaphragm assembly 21 and a voice coil 22, the diaphragm assembly 21 is connected to the first side of the shell 10 along the outer periphery thereof; the voice coil 22 comprises a first end and a second end arranged in axial opposite directions, the first end is connected to the diaphragm assembly 21, and the other end is inserted into a magnetic gap. Thus, the voice coil 22 can vibrate in the magnetic gap when energized, thereby driving the diaphragm assembly 21 to produce sound.

[0040] The side magnetic part comprises a first magnet 331, a second magnet 341, a third magnet 351 and a fourth magnet 361 arranged in sequence in the circumferential direction, two ends of the third magnet 351 are connected with the second magnet 341 and the fourth magnet 361 respectively, and the first magnet 331 is arranged in a spaced manner with the second magnet 341 and the fourth magnet 361. That is, the first magnet 331 is asymmetric with the third magnet 351, and the length of the third magnet 351 is greater than the length of the first magnet 331. Thus, compared with the symmetrically arranged magnets in the related art, the above-mentioned arrangement of the embodiment can increase the effective magnetic field length in the magnetic circuit system 30 for driving the voice coil 22 to vibrate, that is, improve the dynamic coefficient (BL) of the voice coil 22, thereby improving the sound quality effect of the acoustic device 100.

[0041] The acoustic device 100 provided by the embodiment of the utility model overcomes the inherent idea that the vibration main body of the traditional loudspeaker usually adopts a symmetric magnetic field, by connecting two ends of the third magnet 351 in the side magnetic part with the second magnet 341 and the fourth magnet 361 respectively, and arranging the first magnet 331 in a spaced manner with the second magnet 341 and the fourth magnet 361, thereby increasing the effective magnetic field length in the magnetic circuit system 30 for driving the voice coil 22 to vibrate, that is, improving the dynamic coefficient (BL) of the voice coil 22, thereby improving the sound quality effect of the acoustic device 100. And based on the above structure, the acoustic device 100 can still maintain a high sound quality effect under the condition of reducing the thickness, and therefore can be applied to the current electronic equipment with reduced thickness to ensure the sound quality effect thereof.

[0042] In one embodiment, it further comprises a first air hole on one side of the first magnet 331 and a second air hole on one side of the third magnet 351, the first air hole is larger than the second air hole, so as to adjust the resistance of the airflow passing through the air hole, thereby improving the polarization of the voice coil 22.

[0043] Specifically, the shell 10 cooperates with the magnetic circuit system 30 to form a plurality of air holes, wherein the first air hole corresponds to the side of the first magnet 331, and the second air hole corresponds to the side of the third magnet 351. As the effective magnetic field of the one end of the third magnet 351 increases, the force on the corresponding part of the voice coil 22 becomes larger, thereby increasing the amplitude of the corresponding part of the voice coil 22. In the case where the effective magnetic field of the side of the first magnet 331 does not change, the voice coil 22 and the diaphragm assembly 21 will be deflected. Based on this, the size of the second air hole is adjusted to be smaller than that of the first air hole. As the size of the second air hole is reduced, the airflow passing through the second air hole is hindered, and the vibration of the voice coil 22 in this area is reduced. In this way, the amplitude of the voice coil 22 due to the increase in the length of the third magnet 351 can be balanced, so that the amplitudes of the two ends of the voice coil 22 tend to be the same, and the vibration of the voice coil 22 and the diaphragm assembly 21 is balanced.

[0044] The embodiment adjusts the size of the second air hole to be smaller than that of the first air hole, so that the amplitude of the voice coil 22 can be reduced by adjusting the airflow resistance in the second air hole, thereby balancing the amplitude of the voice coil 22 due to the increase in the length of the effective magnetic field of the one end of the third magnet 351, and the deflection problem can be better solved.

[0045] In one embodiment, the shell 10 includes two long axes and two short axes respectively connected to the ends of the two long axes; in the direction of the long axis, the width of the third magnet 351 is greater than the width of the first magnet 331, and in the direction of the short axis, the length of the third magnet 351 is greater than the length of the first magnet 331; and / or, with reference to the line connecting the midpoints of the two long axes of the shell 10, the extension length of the second magnet 341 and the fourth magnet 361 to the one end of the third magnet 351 is greater than the extension length to the one end of the first magnet 331.

[0046] Specifically, the shell 10 is a cuboid frame structure, the length direction is the long axis, the width direction is the short axis, and the thickness direction is the vibration direction. Correspondingly, the first magnet 331 and the third magnet 351 are respectively arranged at the two short axis ends of the shell 10, and the second magnet 341 and the fourth magnet 361 are respectively arranged at the two long axis ends of the shell 10.

[0047] The two ends of the third magnet 351 can be connected to the second magnet 341 and the fourth magnet 361 respectively by extending the third magnet 351 towards the second magnet 341 and the fourth magnet 361, and synchronously extending the second magnet 341 and the fourth magnet 361 towards the third magnet 351.

[0048] Correspondingly, the third magnet 351 can be extended along the long axis direction, the second magnet 341 and the fourth magnet 361 can be extended towards the third magnet 351 to reduce the size of the air hole at one end of the third magnet 351. Wherein, the greater the size of the third magnet 351 along the long axis direction, that is, the wider the third magnet 351, the smaller the size of the second air hole, the greater the air flow resistance of the second air hole, and the greater the reduction of the amplitude of the corresponding region of the voice coil 22 and the diaphragm assembly 21. Similarly, the greater the length of the second magnet 341 and the fourth magnet 361, the smaller the size of the second air hole, the greater the air flow resistance of the second air hole, and the greater the reduction of the amplitude of the corresponding region of the voice coil 22 and the diaphragm assembly 21.

[0049] It should be noted that the utility model provides two methods for adjusting the size of the second air hole, and the two methods can be used alternatively or simultaneously, and the specific selection can be made according to the needs.

[0050] In one embodiment, the centering sheet 23 is further included, and the centering sheet 23 is located on the same side as the first magnet 331, one end of the centering sheet 23 is connected with the shell 10, and the other end is connected with the voice coil 22.

[0051] Specifically, by arranging the centering sheet 23 on the same side of the first magnet 331, the stability of the voice coil 22 can be further improved, and the polarization of the voice coil 22 can be reduced, thereby improving the sound quality effect of the acoustic device 100.

[0052] In one embodiment, the centering sheet 23 includes a first connecting portion 231, a second connecting portion 232, and a vibration portion 233 connected between the first connecting portion 231 and the second connecting portion 232, the first connecting portion 231 is connected with the shell 10, and the second connecting portion 232 is connected with the vibration system 20; two first solder pads 234 are arranged on the first connecting portion 231, the second connecting portion 232 is two, and one second solder pad 235 is arranged on each second connecting portion 232, each first solder pad 234 is electrically connected with one second solder pad 235, and two second solder pads 235 are respectively electrically connected with two lead ends of the voice coil 22.

[0053] Specifically, the first connecting portion 231 is formed in a strip shape and is specifically connected to the second side surface of the shell 10; the second connecting portion 232 is two and is each formed in a sheet shape, and the two second connecting portions 232 are respectively connected to two corner portions of the voice coil 22 corresponding to one end of the first magnetic portion; the vibration portion 233 is formed in a Y shape, two free ends of the Y-shaped structure are respectively connected to the two second connecting portions 232, the other end of the Y-shaped structure is connected to the middle portion of the first connecting portion 231, and the vibration portion 233 has elastic deformation in the vibration direction of the shell 10, so that the second connecting portion 232 can vibrate together with the vibration system 20.

[0054] The incoming terminal lead of the voice coil 22 is spot-welded to a second pad 235, and the outgoing terminal lead of the voice coil 22 is spot-welded to another second pad 235, and since each second pad 235 is electrically connected to a first pad 234, thus when the incoming terminal and outgoing terminal of an external power source are electrically connected to the two first pads 234 respectively, the current can be transmitted in turn between the first pad 234, the second pad 235, the voice coil 22, the second pad 235, and the first pad 234, thereby causing the voice coil 22 to be electrified to vibrate in the magnetic gap and drive the diaphragm assembly 21 to vibrate and produce sound.

[0055] In the embodiment, the number of the centering support pieces is one, and in other embodiments, the number of the centering support pieces can also be two. When the number of the centering support pieces is two, the two centering support pieces can be arranged at intervals on the same side of the first magnet 331.

[0056] In one embodiment, the magnetic circuit system 30 further comprises a magnetic yoke 31, and the center magnetic part 32 and the at least four edge magnetic parts are arranged on the magnetic yoke 31.

[0057] Specifically, the magnetic yoke 31 is in the shape of a plate, and the center magnetic part 32 and the four edge magnetic parts are bonded to the side of the magnetic yoke 31 facing the vibration system 20.

[0058] The center magnetic part 32 comprises a center magnetic body 321 and a center magnetic plate 322 arranged in layers, and the opposite two sides of the center magnetic body 321 are respectively bonded and connected to the sides of the center magnetic plate 322 and the magnetic yoke 31.

[0059] In one embodiment, the shell 10 is connected to the side of the edge magnetic part away from the magnetic yoke 31.

[0060] Specifically, the shell 10 is connected to the side of the four edge magnetic parts away from the magnetic yoke 31, i.e., the shell 10 and the edge magnetic parts are arranged in layers, so that on the one hand, the length and short axis dimensions of the shell 10 can be further reduced, thereby reducing the overall volume of the acoustic device 100, and on the other hand, the size adjustment range of the second magnet 341, the third magnet 351, and the fourth magnet 361 can be increased, thereby further increasing the size adjustment range of the air holes on the side of the third magnet 351, which is conducive to improving the polarization of the vibration system 20 in the acoustic device 100.

[0061] In one embodiment, the edge magnetic part further comprises a first magnetic plate 332, a second magnetic plate 342, a third magnetic plate 352, and a fourth magnetic plate 362 arranged in layers respectively on the first magnet 331, the second magnet 341, the third magnet 351, and the fourth magnet 361, and the first magnetic plate 332 and the third magnetic plate 352 are symmetrically arranged.

[0062] Specifically, the first magnet 331 and the first magnetic conducting plate 332 combine to form the first magnetic part 33, the second magnet 341 and the second magnetic conducting plate 342 combine to form the second magnetic part 34, the third magnet 351 and the third magnetic conducting plate 352 combine to form the third magnetic part 35, and the fourth magnet 361 and the fourth magnetic conducting plate 362 combine to form the fourth magnetic part 36. The first magnetic conducting plate 332, the second magnetic conducting plate 342, the third magnetic conducting plate 352, and the fourth magnetic conducting plate 362 are all in the shape of a strip, and the outer contour of the first magnet 331 and the first magnetic conducting plate 332 is substantially consistent, and the first magnetic conducting plate 332 and the third magnetic conducting plate 352 are symmetrically arranged; the length of the second magnetic conducting plate 342 and the fourth magnetic conducting plate 362 is less than that of the corresponding second magnet 341 and fourth magnet 361.

[0063] The opposite two sides of the first magnet 331 are adhesively connected with the magnetic conducting yoke 31 and the first magnetic conducting plate 332 respectively, the opposite two sides of the second magnet 341 are adhesively connected with the magnetic conducting yoke 31 and the second magnetic conducting plate 342 respectively, the opposite two sides of the third magnet 351 are adhesively connected with the magnetic conducting yoke 31 and the third magnetic conducting plate 352 respectively, and the opposite two sides of the fourth magnet 361 are adhesively connected with the magnetic conducting yoke 31 and the fourth magnetic conducting plate 362 respectively.

[0064] Optionally, the first magnetic conducting plate 332, the second magnetic conducting plate 342, the third magnetic conducting plate 352, and the fourth magnetic conducting plate 362 are integrally formed with the shell 10 by injection molding, so as to realize the connection between the shell 10 and the magnetic circuit system 30. Based on this, the above-mentioned arrangement can also reduce the change of the injection molding mold of the shell 10, thereby reducing the workload and improving the processing efficiency of the acoustic device 100.

[0065] In one embodiment, the shell 10 is further provided with a connecting column, which is located at both ends of the first magnet 331 and connected with the magnetic conducting yoke 31.

[0066] In this way, on the one hand, the size of the air hole at one end of the first magnet 331 can be reduced, thereby reducing the adjustment range of the size of the air hole at one end of the third magnet 351, and further reducing the length of the second magnet 341, the third magnet 351, and the fourth magnet 361, thereby reducing the material cost, and on the other hand, the connection strength between the shell 10 and the magnetic circuit system 30 can be improved, and the structural reliability of the acoustic device 100 can be improved.

[0067] In one embodiment, the diaphragm assembly 21 includes a diaphragm 211 and a vibrating plate 212. The diaphragm 211 is in the shape of a ring and includes, from the outside to the inside, an outer fixed part, a folded ring part, and an inner fixed part. The outer fixed part is connected to the first side of the shell 10, and the inner fixed part is connected to the outer circumferential edge of the vibrating plate 212. The voice coil 22 is connected to the vibrating plate 212.

[0068] The utility model discloses second aspect still provides a kind of electronic equipment, including the acoustic device 100 of any one of above. The structure of acoustic device 100 refers to above embodiment. Since the electronic equipment in the embodiment includes all technical solutions in above embodiment, it also has the beneficial effects of at least the above technical solutions.

[0069] The electronic device in the embodiment can be a mobile phone, a headset, a tablet, a computer, a wearable device, etc.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An acoustic device, characterized by The acoustic device comprises a shell, a vibration system and a magnetic circuit system accommodated in the shell, the magnetic circuit system comprises a center magnetic part and a side magnetic part, the side magnetic part is arranged around the center magnetic part to form a magnetic gap with the center magnetic part, and a voice coil of the vibration system is at least partially inserted into the magnetic gap. The side magnetic part comprises side magnets, the side magnets comprise a first magnet, a second magnet, a third magnet and a fourth magnet arranged in sequence in a circumferential direction, two ends of the third magnet are connected with the second magnet and the fourth magnet respectively, and the first magnet is arranged in a spaced manner with the second magnet and the fourth magnet.

2. The acoustic device of claim 1, wherein, The acoustic device further comprises a first air hole on one side of the first magnet and a second air hole on one side of the third magnet, the first air hole is larger than the second air hole, so as to adjust the resistance of air flow passing through the air holes and improve the polarization of the voice coil.

3. The acoustic device of claim 2, wherein, The shell comprises two long axes and two short axes, in the direction of the long axis, the width of the third magnet is greater than the width of the first magnet, in the direction of the short axis, the length of the third magnet is greater than the length of the first magnet, and / or With reference to the line connecting the midpoints of the two long axes of the shell, the extension length of the second magnet and the fourth magnet to one end of the third magnet is greater than the extension length to one end of the first magnet.

4. The acoustic device of claim 1, wherein, The acoustic device further comprises a centering support sheet, the centering support sheet is located on the same side as the first magnet, one end of the centering support sheet is connected with the shell, and the other end is connected with the vibration system.

5. The acoustic device of claim 4, wherein, The centering support sheet comprises a first connecting part, a second connecting part and a vibration part connected between the first connecting part and the second connecting part, the first connecting part is connected with the shell, and the second connecting part is connected with the vibration system. The first connecting part is provided with two first solder pads, the second connecting part is two, each of the second connecting parts is provided with one second solder pad, each of the first solder pads is electrically connected with one of the second solder pads, and two of the second solder pads are respectively electrically connected with two lead ends of the voice coil.

6. The acoustic device of claim 1, wherein, The magnetic circuit system further comprises a magnetic yoke, and the center magnetic part and at least four side magnetic parts are arranged on the magnetic yoke.

7. The acoustic device of claim 6, wherein, The shell is connected to the side of the side magnetic part away from the magnetic yoke.

8. The acoustic device of claim 7, wherein, The side magnetic part further comprises a first magnetic guide plate, a second magnetic guide plate, a third magnetic guide plate and a fourth magnetic guide plate which are respectively arranged in layers on the first magnet, the second magnet, the third magnet and the fourth magnet, and the first magnetic guide plate is symmetrically arranged with the third magnetic guide plate.

9. The acoustic device of claim 7, wherein, The shell is further provided with a connecting column, the connecting column is located at two ends of the first magnet, and the connecting column is connected with the magnetic yoke.

10. An electronic device, comprising: The acoustic device comprises the acoustic device according to any one of claims 1-9.

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