Sound production device and electronic equipment

Abstract

The utility model discloses a sounding device and electronic equipment, and relates to the electroacoustic conversion technology field, the sounding device comprises a housing, a magnetic circuit system and a vibration system, a common magnetic part of the magnetic circuit system is arranged at the outer side of a central magnetic part and is separated from the central magnetic part to form a first magnetic gap, and an edge magnetic part is arranged at the outer side of the common magnetic part and is separated from the central magnetic part to form a second magnetic gap. The central magnetic part comprises a first central magnet, a central magnetic conductive plate and a second central magnet which are arranged in a stacked mode, the shared magnetic part comprises a first shared magnet, a shared magnetic conductive plate and a second shared magnet which are arranged in a stacked mode, and an inner ring hole is formed in the center of a vibrating diaphragm of the vibrating system. The inner periphery of the vibrating diaphragm is connected with the magnetic circuit system, the first voice coil corresponds to the first magnetic gap, and the second voice coil corresponds to the second magnetic gap. According to the sounding device, the utilization rate of the magnetic circuit system is effectively improved, and the BL value is improved, so that the loudness and the sensitivity of the sounding device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic conversion, in particular to a sound-generating device and an electronic device using the sound-generating device. Background Art

[0002] With the development of the portable consumer electronics market, miniature sound-generating devices have become widely used. Furthermore, the increasing multifunctionality and miniaturization of portable electronic devices have placed higher demands on the vibroacoustic performance of miniature sound-generating devices. Sound-generating devices generally consist of a magnetic circuit system and a vibration system. The vibration system includes a diaphragm and a voice coil attached to one side of the diaphragm. The energized voice coil, under the action of the magnetic circuit system, drives the diaphragm to vibrate, thereby producing sound.

[0003] In related technologies, small rear cavity sound-emitting devices usually adopt a single voice coil solution. The voice coil has a low utilization rate of the magnetic field generated by the magnetic circuit system, and the vibration effect of the diaphragm driven by the voice coil is not ideal, which reduces the BL value of the sound-emitting device. In addition, the utilization rate of the magnetic energy in the middle area of the central magnet in the magnetic circuit system is low and cannot be effectively utilized, thereby affecting the loudness and sensitivity of the micro speaker. Utility Model Content

[0004] The main purpose of the present utility model is to provide a sound-generating device and an electronic device, aiming to provide a sound-generating device with a high magnetic field utilization rate. The sound-generating device optimizes the magnetic circuit system and adopts inner and outer double voice coils to further improve the utilization rate of the magnetic circuit system and increase the BL value, thereby improving the loudness and sensitivity of the sound-generating device.

[0005] To achieve the above-mentioned purpose, the present invention provides a sound-generating device, which includes:

[0006] shell;

[0007] a magnetic circuit system connected to one end of the housing, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion, a common magnetic portion, and an edge magnetic portion provided on the magnetic yoke, the common magnetic portion being located outside the central magnetic portion and spaced apart from the central magnetic portion to form a first magnetic gap, the edge magnetic portion being located outside the common magnetic portion and spaced apart from the common magnetic portion to form a second magnetic gap, the first magnetic gap and the second magnetic gap being coaxially arranged, the central magnetic portion comprising a first central magnet, a central magnetic plate, and a second central magnet arranged in a stacked manner, and the common magnetic portion comprising a first common magnet, a common magnetic plate, and a second common magnet arranged in a stacked manner; and

[0008] a vibration system comprising a diaphragm and a first voice coil and a second voice coil connected to the diaphragm, wherein the diaphragm is centrally provided with an inner ring hole, an outer periphery of the diaphragm is connected to the housing, and an inner periphery of the diaphragm is connected to the magnetic circuit system, the first voice coil is disposed corresponding to the first magnetic gap, and the second voice coil is disposed corresponding to the second magnetic gap;

[0009] The first central magnet, the central magnetic conductive plate and the second central magnet respectively correspond to the first common magnet, the common magnetic conductive plate and the second common magnet in a one-to-one manner in a vibration direction perpendicular to the vibration system.

[0010] In one embodiment, the magnetically conductive yoke includes a first magnetic yoke and a second magnetic yoke, the central magnetic portion, the common magnetic portion, and the edge magnetic portion are all provided on the first magnetic yoke, the second magnetic yoke is connected to the central magnetic portion and the common magnetic portion at one end away from the first magnetic yoke, the first central magnet and the first common magnet are connected to the first magnetic yoke, and the second central magnet and the second common magnet are connected to the second magnetic yoke;

[0011] The inner periphery of the diaphragm is connected to the second magnetic yoke so that a portion of the second magnetic yoke corresponds to the inner annular hole.

[0012] In one embodiment, the diaphragm includes an inner ring portion, a first fold ring arranged around the inner ring portion, a straight portion arranged around the first fold ring, a second fold ring arranged around the straight portion, and a fixed portion connected to the outer side of the second fold ring, the fixed portion is connected to the outer shell, the inner ring portion is formed with the inner ring hole, and the inner ring portion is connected to the periphery of the second magnetic yoke.

[0013] In one embodiment, the inner ring portion, the first fold ring, the straight portion, the second fold ring and the fixing portion are an integrally formed structure;

[0014] And / or, the protruding direction of the first fold ring is opposite to the protruding direction of the second fold ring;

[0015] And / or, a avoidance structure is provided on the periphery of the second common magnet adjacent to the second magnetic gap;

[0016] And / or, the second magnetic yoke includes a protrusion and an edge portion connected to the protrusion, the inner ring portion is connected to the edge portion so that the protrusion passes through the inner ring hole, the protrusion forms a recessed groove facing the central magnetic portion, and the second central magnet has a protrusion protruding from the second common magnet, and the protrusion is accommodated and confined in the recessed groove.

[0017] In one embodiment, the common magnetic portion is provided with an escape gap connecting the first magnetic gap and the second magnetic gap;

[0018] The vibration system also includes a skeleton, which includes a main body and a connecting part connected to the main body. The main body is connected to the diaphragm, and the connecting part is located in the avoidance gap. Both ends of the connecting part are respectively connected to the first voice coil and the second voice coil.

[0019] In one embodiment, an escape space is formed between the edge magnetic portion and the housing;

[0020] The vibration system further includes a centering support plate, one end of which is connected to the housing, and the other end of which is located in the avoidance space;

[0021] The skeleton includes an extension portion, one end of which is connected to the periphery of the main body portion, and the other end of which extends toward the centering support piece and is connected to the centering support piece.

[0022] In one embodiment, the main body is arranged in a rectangular ring, the connecting portion includes a plurality of connecting portions, the plurality of connecting portions are respectively arranged corresponding to the four corners of the main body, and the common magnetic portion is provided with an avoidance notch corresponding to each of the connecting portions;

[0023] And / or, a first connecting surface and a second connecting surface are respectively provided at both ends of the connecting portion, the first connecting surface is connected to the first voice coil, and the second connecting surface is connected to the second voice coil;

[0024] And / or, the shell has a long side and a short side connected end to end, and the centering support plates include two, and the two centering support plates are symmetrically arranged and respectively corresponding to the two long sides or the two short sides.

[0025] In one embodiment, the first central magnet and the second central magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles of the first central magnet and the second central magnet close to the central magnetic conductive plate are the same;

[0026] The first common magnet and the second common magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles of the first common magnet and the second common magnet close to the common magnetic conductive plate are the same;

[0027] The magnetic poles of the first central magnet and the second central magnet close to the central magnetic conductive plate are opposite to the magnetic poles of the first common magnet and the second common magnet close to the common magnetic conductive plate.

[0028] In one embodiment, the edge magnetic portion includes a stacked edge magnet and an edge magnetic conductive plate, the edge magnet is connected to the magnetic conductive yoke, and the edge magnetic conductive plate is connected to the housing;

[0029] In which, the side magnets are magnetized along the vibration direction of the vibration system, the magnetic poles of the side magnets close to the side magnetic conductive plates are the same as the magnetic poles of the first center magnet close to the center magnetic conductive plates, and the magnetic poles of the side magnets close to the side magnetic conductive plates are opposite to the magnetic poles of the first common magnet close to the common magnetic conductive plates.

[0030] In one embodiment, at least a portion of the projection of the common magnetic conductive plate along a vibration direction perpendicular to the vibration system coincides with the projections of the first voice coil and the second voice coil along the vibration direction perpendicular to the vibration system;

[0031] And / or, a projection of at least part of the central magnetic conductive plate along a vibration direction perpendicular to the vibration system coincides with a projection of the first voice coil along the vibration direction perpendicular to the vibration system;

[0032] And / or, the thickness of the first central magnet along the vibration direction of the vibration system is the same as the thickness of the first common magnet along the vibration direction of the vibration system;

[0033] And / or, the thickness of the second central magnet along the vibration direction of the vibration system is greater than or equal to the thickness of the second common magnet along the vibration direction of the vibration system;

[0034] And / or, the thickness of the central magnetic conductive plate along the vibration direction of the vibration system is the same as the thickness of the side magnetic conductive plates along the vibration direction of the vibration system;

[0035] And / or, the side magnetic conductive plate and the shell are an integrally formed structure.

[0036] In one embodiment, the edge magnetic portion forms a closed integral ring structure;

[0037] Alternatively, the edge magnetic portion includes a plurality of edge magnetic portions, and adjacent edge magnetic portions are connected end to end to form a closed ring structure;

[0038] Alternatively, the edge magnetic portion includes a plurality of edge magnetic portions, and there is a gap between adjacent edge magnetic portions.

[0039] In one embodiment, the sound-emitting device is installed in the shell of the sound-emitting module, and forms a front cavity and a rear cavity between the shell and the sound-emitting device. The shell is provided with a sound outlet hole connected to the front cavity, and the sound waves of the diaphragm are radiated to the outside through the sound outlet hole, wherein the volume of the rear cavity is ≤1.5cc.

[0040] The present utility model also provides an electronic device, which includes the above-mentioned sound-generating device.

[0041] The sound-generating device of the technical solution of the present invention connects the magnetic circuit system to one end of the shell and the periphery of the diaphragm of the vibration system to the shell, thereby integrating and fixing the magnetic circuit system and the vibration system on the shell; at the same time, by setting the magnetic circuit system as a magnetic yoke and a central magnetic part, a common magnetic part and a side magnetic part provided on the magnetic yoke, so that the common magnetic part is located on the outside of the central magnetic part and is spaced from the central magnetic part to form a first magnetic gap, and the side magnetic part is located on the outside of the common magnetic part and is spaced from the common magnetic part to form a second magnetic gap, so that the first voice coil of the vibration system is set corresponding to the first magnetic gap, and the second voice coil is set corresponding to the second magnetic gap, forming an inner and outer double voice coil structure, so that current is passed through the first voice coil and the second voice coil, so that the two voice coils are respectively in the first magnetic gap and the second magnetic gap formed by the magnetic circuit system. The diaphragm vibrates in the magnetic field of the magnetic gap and drives the diaphragm to vibrate and produce sound, thereby improving the BL value; further, by setting the central magnetic part as the first central magnet, the central magnetic plate and the second central magnet which are stacked, and setting the common magnetic part as the first common magnet, the common magnetic plate and the second common magnet which are stacked, the first central magnet, the central magnetic plate and the second central magnet respectively correspond to the first common magnet, the common magnetic plate and the second common magnet in a vibration direction perpendicular to the vibration system. In this way, the common magnetic part is shared by the central magnetic part and the side magnetic part, and two magnetic gaps arranged inside and outside are formed, so that the first voice coil and the second voice coil can make full use of the magnetic field of the central magnetic part and the common magnetic part, improve the magnetic energy utilization rate of the magnetic circuit system, thereby improving the loudness and sensitivity of the sound-emitting device, and improving product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0043] Figure 1 This is an exploded schematic diagram of an embodiment of the sound-generating device provided by the present utility model;

[0044] Figure 2 A cross-sectional schematic diagram of an embodiment of a sound-generating device provided by the present utility model;

[0045] Figure 3 A partial structural diagram of an embodiment of a sound-generating device provided by the present utility model;

[0046] Figure 4 A schematic structural diagram of an embodiment of a diaphragm provided by the present invention;

[0047] Figure 5A schematic structural diagram of an embodiment of a skeleton provided by the present invention;

[0048] Figure 6 This is a cross-sectional schematic diagram of an embodiment of the sound module provided by the utility model.

[0049] Description of Figure Numbers:

[0050] 100. Sounding device; 1. Housing; 11. Long side; 12. Short side; 13. Avoidance space; 2. Magnetic circuit system; 21. Magnetic yoke; 211. First magnetic yoke; 212. Second magnetic yoke; 2121. Raised portion; 2122. Edge portion; 2123. Recessed groove; 22. Central magnetic portion; 221. First central magnet; 222. Central magnetic plate; 223. Second central magnet; 224. Protruding portion; 23. Common magnetic portion; 231. First common magnet; 232. Common magnetic plate; 233. Second common magnet; 234. Avoidance structure; 235. Avoidance gap; 24. Edge magnetic portion; 241 , side magnet; 242, side magnetic plate; 25, first magnetic gap; 26, second magnetic gap; 3, vibration system; 31, diaphragm; 311, inner ring; 312, inner ring hole; 313, first fold ring; 314, straight part; 315, second fold ring; 316, fixed part; 32, first voice coil; 33, second voice coil; 34, skeleton; 341, main body; 342, connecting part; 3421, first connecting surface; 3422, second connecting surface; 343, extension part; 35, centering support plate; 400, shell; 410, sound hole; 420, front cavity; 430, rear cavity; 500, sound module.

[0051] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0054] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or an option in which both A and B are satisfied.

[0055] In addition, in this utility model, the descriptions of "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0056] With the development of the portable consumer electronics market, miniature sound-generating devices have become widely used. Furthermore, the increasing multifunctionality and miniaturization of portable electronic devices have placed higher demands on the vibroacoustic performance of miniature sound-generating devices. Sound-generating devices generally consist of a magnetic circuit system and a vibration system. The vibration system includes a diaphragm and a voice coil attached to one side of the diaphragm. The energized voice coil, under the action of the magnetic circuit system, drives the diaphragm to vibrate, thereby producing sound.

[0057] In related technologies, small rear-cavity sound-generating devices (typically with a rear cavity less than 1.5cc) typically use a single voice coil solution. This voice coil has a low utilization rate of the magnetic field generated by the magnetic circuit system, and the vibration effect of the voice coil driving the diaphragm is also unsatisfactory, thus reducing the BL value of the sound-generating device. Furthermore, the magnetic energy utilization rate of the central magnetic region in the magnetic circuit system is low, and it is not effectively utilized, thus affecting the loudness and sensitivity of the micro-speaker. The loudness of micro-speakers generally cannot meet the demand, so further improving the utilization rate of the magnet and enhancing the sensitivity of the sound-generating device is an important task.

[0058] Based on the above ideas and problems, the present invention proposes a sound-generating device 100. It is understandable that the sound-generating device 100 is applied to electronic devices, which may be mobile phones, computers, headphones, watches, etc., without limitation herein.

[0059] Please refer to Figures 1 to 5As shown, in an embodiment of the present invention, the sound-generating device 100 includes a housing 1, a magnetic circuit system 2 and a vibration system 3. The magnetic circuit system 2 is connected to one end of the housing 1. The magnetic circuit system 2 includes a magnetic yoke 21 and a central magnetic portion 22, a common magnetic portion 23 and an edge magnetic portion 24 provided on the magnetic yoke 21. The common magnetic portion 23 is located on the outside of the central magnetic portion 22 and is spaced from the central magnetic portion 22 to form a first magnetic gap 25. The edge magnetic portion 24 is located on the outside of the common magnetic portion 23 and is spaced from the common magnetic portion 23 to form a second magnetic gap 26. The first magnetic gap 25 and the second magnetic gap 26 are coaxially arranged. The central magnetic portion 22 includes a first central magnet 221, a central magnetic plate 222 and a second central magnet 223 that are stacked. The common magnetic portion 23 includes a first common magnet 231, a common magnetic plate 232 and a second common magnet 233 arranged in a stacked manner. The vibration system 3 includes a diaphragm 31 and a first voice coil 32 and a second voice coil 33 connected to the diaphragm 31. An inner ring hole 312 is provided in the center of the diaphragm 31. The outer periphery of the diaphragm 31 is connected to the outer shell 1, and the inner periphery of the diaphragm 31 is connected to the magnetic circuit system 2. The first voice coil 32 is arranged corresponding to the first magnetic gap 25, and the second voice coil 33 is arranged corresponding to the second magnetic gap 26; wherein, the first central magnet 221, the central magnetic plate 222 and the second central magnet 223 respectively correspond to the first common magnet 231, the common magnetic plate 232 and the second common magnet 233 in a one-to-one manner perpendicular to the vibration direction of the vibration system 3.

[0060] In this embodiment, the housing 1 is used to install, fix, support and protect components such as the vibration system 3 and the magnetic circuit system 2, that is, the housing 1 provides an installation base for components such as the vibration system 3 and the magnetic circuit system 2. It can be understood that the housing 1 can be a mounting shell, a shell or a box body with a mounting cavity, that is, the housing 1 defines a receiving space, which is not limited here. Optionally, the housing 1 has a rectangular structure, and the housing 1 has two opposite long sides and two short sides, the two ends of the short side are respectively connected to the two long sides, and the two ends of the long side are respectively connected to the two short sides, so that the housing 1 defines a receiving space.

[0061] It is understood that when the housing 1 is metal, the magnetic circuit system 2 is fixed to the housing 1 by bonding or welding. In another embodiment, when the housing 1 is plastic injection molded, the side magnetic conductive plate 242 of the magnetic circuit system 2 is first injection molded into the housing 1 as an insert, or the magnetic circuit system 2 is fixed to the housing 1 by bonding, and then the other parts are bonded and fixed, which is not limited here.

[0062] In this embodiment, the magnetic circuit system 2 is disposed within the receiving space and connected to the housing 1. The magnetic circuit system 2 is configured as a magnetic yoke 21 and a central magnetic portion 22, a common magnetic portion 23, and a side magnetic portion 24 disposed on the magnetic yoke, such that the common magnetic portion 23 is located outside the central magnetic portion 22 and spaced apart from the central magnetic portion 22 to form a first magnetic gap 25, and the side magnetic portion 24 is located outside the common magnetic portion 23 and spaced apart from the common magnetic portion 23 to form a second magnetic gap 26. In other words, the second magnetic gap 26 is disposed around the first magnetic gap 25. Furthermore, the vibration system 3 is configured as a diaphragm 31 and a first voice coil 32 and a second voice coil 33 connected to the diaphragm 31. Therefore, the first voice coil 32 of the vibration system 3 is disposed corresponding to the first magnetic gap 25, and the second voice coil 33 is disposed corresponding to the second magnetic gap 26, thereby forming an inner-outer dual voice coil structure.

[0063] In this embodiment, the first voice coil 32 and the second voice coil 33 are annular racetrack voice coils, one end of the first voice coil 32 and the second voice coil 33 is connected to the diaphragm 31, and the other ends of the first voice coil 32 and the second voice coil 33 are suspended in the first magnetic gap 25 and the second magnetic gap 26, respectively, which is not limited here.

[0064] It should be noted that by passing current through the first voice coil 32 and the second voice coil 33, the first voice coil 32 and the second voice coil 33 transfer electrical energy to the first magnetic gap 25 and the second magnetic gap 26 of the magnetic circuit system 2, so that the magnetic field generated by the magnetic circuit system 2 converts the electrical energy into mechanical energy, thereby causing the first voice coil 32 and the second voice coil 33 to vibrate, and at the same time drive the diaphragm 31 to vibrate and produce sound, further converting the mechanical energy into sound energy.

[0065] As can be understood, after receiving the externally varying AC signal, the first voice coil 32, disposed within the first magnetic gap 25, is driven by the magnetic field of the magnetic circuit system 2 to reciprocate and cut through the magnetic lines of force, thereby causing the diaphragm 31 of the vibration system 3 to vibrate and produce sound. Simultaneously, after receiving the transmitted AC signal, the second voice coil 33, driven by the magnetic field of the second magnetic gap 26, fully utilizes the magnetic field of the magnetic circuit system 2 to reciprocate and cut through the magnetic lines of force, thereby fully utilizing the magnetic field of the magnetic circuit system 2. This allows the first voice coil 32 and the second voice coil 33 to cooperate to increase the driving force on the diaphragm 31, thereby effectively improving the BL value of the sound-generating device 100 and enhancing the vibration effect of the diaphragm 31.

[0066] In this embodiment, the first voice coil 32 and the second voice coil 33 can be connected in series or in parallel via a conductive structure, which is not limited here. In order to achieve electrical connection between the first voice coil 32 and the second voice coil 33 and the external circuit. In one embodiment, the vibration system 3 also includes a centering support plate or a connector or a skeleton 34, one end of which is connected to the first voice coil 32 and the second voice coil 33 and is connected to the leads of the first voice coil 32 and the second voice coil 33, and the other end of the centering support plate or the connector or the skeleton 34 is connected to the housing 1.

[0067] As will be understood, taking the centering damper as an example, the two ends of the centering damper are electrically connected to the leads of the first and second voice coils 32, 33 and the external circuitry, respectively. In this embodiment, the centering dampers can be disposed at the bottom of the first and second voice coils 32, 33, located at the four corners of the sound-generating device 100 or along the minor or major axis of the sound-generating device 100. Of course, the centering dampers can also be disposed at the tops of the first and second voice coils 32, 33, and located between the first and second voice coils 32, 33 and the diaphragm 31, but this is not a limitation here.

[0068] In one embodiment, the direction of the current in the second voice coil 33 is opposite to the direction of the current in the first voice coil 32. It is understood that the current in the second voice coil 33 flows counterclockwise, while the current in the first voice coil 32 flows clockwise. This arrangement ensures that the vibration direction of the first voice coil 32 in the first magnetic gap 25 is the same as the vibration direction of the second voice coil 33 in the second magnetic gap 26, thereby ensuring that the diaphragm 31 vibrates in the same direction at the same time, thereby enhancing the vibration effect on the diaphragm 31.

[0069] In this embodiment, the magnetic yoke 21 of the magnetic circuit system 2 is opposite to the diaphragm 31, and the central magnetic portion 22, the common magnetic portion 23 and the edge magnetic portion 24 are all arranged on the side of the magnetic yoke 21 facing the diaphragm 31. The magnetic circuit system 2 can be connected to the housing 1 through the edge magnetic portion 24 and / or the magnetic yoke 21.

[0070] Alternatively, the magnetic yoke 21 may be a magnetic plate or a magnetic frame, etc., without limitation herein. The magnetic yoke 21 is used to support and secure the central magnetic portion 22, the common magnetic portion 23, and the side magnetic portions 24. In this embodiment, the magnetic yoke 21 is bonded to the central magnetic portion 22, the common magnetic portion 23, and the side magnetic portions 24, and the side magnetic portions 24 are bonded to the housing 1.

[0071] In this embodiment, the common magnetic part 23 is arranged around the central magnetic part 22. Optionally, the common magnetic part 23 can be a closed, one-piece annular structure, in which the annular common magnetic part 23 surrounds the central magnetic part 22 and is spaced from the central magnetic part 22 to form an annular first magnetic gap 25. Optionally, the common magnetic part 23 can be in the shape of a circular ring or a rectangular ring, etc. Of course, the common magnetic part 23 includes a plurality of common magnetic parts 23, which are arranged around the central magnetic part 22, and adjacent common magnetic parts 23 are connected end to end to form a closed annular structure; or, the common magnetic part 23 includes a plurality of common magnetic parts 23, which are spaced and arranged around the central magnetic part 22, and there is a gap between adjacent common magnetic parts 23, and the gap can be an avoidance gap 235, which is used to provide avoidance space for the skeleton 34, and is not limited here.

[0072] In one embodiment, the edge magnet portion 24 forms a closed, integral annular structure. The annular edge magnet portion 24 surrounds the common magnetic portion 23 and is spaced apart from the common magnetic portion 23 to form an annular second magnetic gap 26. Optionally, the edge magnet portion 24 can be in the form of a circular ring or a rectangular ring. Of course, the edge magnet portion 24 may include multiple edge magnet portions 24, with adjacent edge magnet portions 24 connected end to end to form a closed annular structure; or, the edge magnet portion 24 may include multiple edge magnet portions 24, with multiple edge magnet portions 24 spaced apart and arranged around the common magnetic portion 23, with gaps between adjacent edge magnet portions 24, which is not limited here.

[0073] In this embodiment, by setting the central magnetic part 22 as a first central magnet 221, a central magnetic plate 222 and a second central magnet 223 which are stacked, and setting the common magnetic part 23 as a first common magnet 231, a common magnetic plate 232 and a second common magnet 233 which are stacked, the first central magnet 221, the central magnetic plate 222 and the second central magnet 223 of the central magnetic part 22 respectively correspond to the first common magnet 231, the common magnetic plate 232 and the second common magnet 233 of the common magnetic part 23 in a vibration direction perpendicular to the vibration system 3. In this way, the common magnetic part 23 is shared by the central magnetic part 22 and the side magnetic part 24, and a first magnetic gap 25 and a second magnetic gap 26 are formed, so that the first voice coil 32 and the second voice coil 33 can fully utilize the magnetic field of the magnetic circuit system 2, thereby improving the magnetic energy utilization rate of the magnetic circuit system 2, thereby improving the loudness and sensitivity of the sound-emitting device 100, thereby improving product performance.

[0074] In one embodiment, if Figure 1 、 Figure 2 and Figure 4 As shown, an inner ring hole 312 is provided in the center of the diaphragm 31 , the outer periphery of the diaphragm 31 is connected to the housing 1 , and the inner periphery of the diaphragm 31 is connected to the magnetic circuit system 2 .

[0075] It can be understood that by setting the diaphragm 31 as a ring structure, the inner periphery of the diaphragm 31 is connected to the magnetic circuit system 2, so that part of the magnetic circuit system 2 corresponds to the inner ring hole 312. When the sound-emitting device 100 is applied to a module or electronic device, the magnetic circuit system 2 of the sound-emitting device 100 can be used to abut against the inner wall of the shell of the electronic device, so that a front cavity is formed between the diaphragm 31 and the shell, that is, there is no need to increase the front cavity space. The front sound cavity structure can be formed by utilizing the height difference between the magnetic circuit system 2 and the diaphragm 31 in the vibration system 3, thereby effectively reducing the Z-direction height of the electronic device.

[0076] The sound-generating device 100 of the present invention connects the magnetic circuit system 2 to one end of the housing 1 and connects the periphery of the diaphragm 31 of the vibration system 3 to the housing 1, thereby realizing that the magnetic circuit system 2 and the vibration system 3 are integrated and fixed on the housing 1; at the same time, by setting the magnetic circuit system 2 as a magnetic yoke 21 and a central magnetic portion 22, a common magnetic portion 23 and a side magnetic portion 24 provided on the magnetic yoke, so that the common magnetic portion 23 is located on the outside of the central magnetic portion 22 and is spaced from the central magnetic portion 22 to form a first magnetic gap 25, and the side magnetic portion 24 is located on the outside of the common magnetic portion 23 and is spaced from the common magnetic portion 23 to form a second magnetic gap 26, so that the first voice coil 32 of the vibration system 3 is set corresponding to the first magnetic gap 25, and the second voice coil 33 is set corresponding to the second magnetic gap 26, forming an inner and outer double voice coil structure, so that current is passed through the first voice coil 32 and the second voice coil 33, so that the two voice coils are respectively in the magnetic gaps 25 and the second magnetic gap 26 formed by the magnetic circuit system 2. The vibration in the field drives the diaphragm 31 to vibrate and produce sound, so as to improve the BL value; further, by setting the central magnetic part 22 to the first central magnet 221, the central magnetic plate 222 and the second central magnet 223 arranged in a stacked manner, and setting the common magnetic part 23 to the first common magnet 231, the common magnetic plate 232 and the second common magnet 233 arranged in a stacked manner, the first central magnet 221, the central magnetic plate 222 and the second central magnet 223 respectively correspond to the first common magnet 231, the common magnetic plate 232 and the second common magnet 233 in a vibration direction perpendicular to the vibration system 3. In this way, the common magnetic part 23 is shared by the central magnetic part 22 and the side magnetic part 24, and two magnetic gaps arranged inside and outside are formed, so that the first voice coil 32 and the second voice coil 33 can make full use of the magnetic fields of the central magnetic part 22 and the common magnetic part 23, thereby improving the magnetic energy utilization rate of the magnetic circuit system 2, thereby improving the loudness and sensitivity of the sound-emitting device 100, and improving product performance.

[0077] In one embodiment, the magnetic yoke 21 includes a first magnetic yoke 211 and a second magnetic yoke 212, the central magnetic portion 22, the common magnetic portion 23 and the edge magnetic portion 24 are all arranged on the first magnetic yoke 211, the second magnetic yoke 212 is connected to the end of the central magnetic portion 22 and the common magnetic portion 23 away from the first magnetic yoke 211, the first central magnet 221 and the first common magnet 231 are connected to the first magnetic yoke 211, and the second central magnet 223 and the second common magnet 233 are connected to the second magnetic yoke 212; the inner periphery of the diaphragm 31 is connected to the second magnetic yoke 212 so that part of the second magnetic yoke 212 corresponds to the inner ring hole 312.

[0078] In this embodiment, if Figure 1 and Figure 2 As shown, by setting the magnetic yoke 21 as the first magnetic yoke 211 and the second magnetic yoke 212 set opposite to each other, an installation space is formed between the first magnetic yoke 211 and the second magnetic yoke 212. At this time, the central magnetic part 22 and the common magnetic part 23 are arranged between the first magnetic yoke 211 and the second magnetic yoke 212, that is, the first central magnet 221 of the central magnetic part 22 and the first common magnet 231 of the common magnetic part 23 are connected to the first magnetic yoke 211, and the second central magnet 223 of the central magnetic part 22 and the second common magnet 233 of the common magnetic part 23 are connected to the second magnetic yoke 212. By setting the diaphragm 31 as a ring structure, the inner ring of the diaphragm 31 is connected to the second magnetic yoke 212, so that part of the second magnetic yoke 212 corresponds to the inner ring hole 312, and the side magnetic portion 24 is located between the magnetic yoke 21 and the diaphragm 31. In this way, the magnetic flux lines generated by the central magnetic portion 22 and the magnetic flux lines generated by the common magnetic portion 23 can effectively form a magnetic circuit passing through the first magnetic gap 25, and the magnetic flux lines generated by the common magnetic portion 23 and the magnetic flux lines generated by the side magnetic portion 24 can form a magnetic circuit passing through the second magnetic gap 26, effectively increasing the density of the magnetic flux between the first magnetic gap 25 and the second magnetic gap 26, so that the first voice coil 32 and the second voice coil 33 are in a more reasonable magnetic field, thereby alleviating the distortion of the audio output by the sound-generating device 100 and improving the sound quality of the audio output by the sound-generating device 100.

[0079] It can be understood that by connecting the inner periphery of the diaphragm 31 to the second magnetic yoke 212, the diaphragm 31 and the second magnetic yoke 212 are sealed, thereby improving the sealing performance. At the same time, part of the second magnetic yoke 212 corresponds to the inner ring hole 312. When the sound-generating device 100 is applied to a module or electronic device, the second magnetic yoke 212 of the magnetic circuit system 2 of the sound-generating device 100 can be used to abut against the inner wall of the shell of the electronic device, so that a front cavity is formed between the diaphragm 31 and the shell, that is, there is no need to increase the front cavity space. The front sound cavity structure can be formed by utilizing the height difference between the second magnetic yoke 212 of the magnetic circuit system 2 and the diaphragm 31 in the vibration system 3, thereby effectively reducing the Z-direction height of the electronic device.

[0080] Optionally, the central magnetic portion 22, the common magnetic portion 23 and the edge magnetic portion 24 are all magnetized in the vertical direction, the magnetization direction of the common magnetic portion 23 is opposite to that of the central magnetic portion 22 and the edge magnetic portion 24, and the magnetization direction of the central magnetic portion 22 and the edge magnetic portion 24 is the same. Such an arrangement can optimize the nonlinear performance of BL.

[0081] In one embodiment, the diaphragm 31 includes an inner ring portion 311, a first fold ring 313 arranged around the inner ring portion 311, a straight portion 314 arranged around the first fold ring 313, a second fold ring 315 arranged around the straight portion 314, and a fixing portion 316 connected to the outer side of the second fold ring 315, the fixing portion 316 is connected to the outer shell 1, the inner ring portion 311 is formed with an inner ring hole 312, and the inner ring portion 311 is connected to the periphery of the second magnetic yoke 212.

[0082] In this embodiment, if Figure 1 、 Figure 2 and Figure 4 As shown, the inner ring portion 311 , the first fold ring 313 , the straight portion 314 , the second fold ring 315 and the fixing portion 316 of the diaphragm 31 may be an integrally formed structure, thereby ensuring the vibration performance and structural strength of the diaphragm 31 .

[0083] It is understood that the first fold 313 and the second fold 315 of the diaphragm 31 can have an upwardly protruding convex structure or a downwardly concave structure, without limitation herein. Optionally, the protruding direction of the first fold 313 is opposite to the protruding direction of the second fold 315. In this embodiment, one of the first fold 313 and the second fold 315 can also be upwardly protruding and the other downwardly protruding, without limitation herein. To prevent interference between the first fold 313 of the diaphragm 31 and the second magnetic yoke 212 and the shared magnetic portion 23, in this embodiment, the first fold 313 of the diaphragm 31 is upwardly protruding and the second fold 315 is downwardly protruding.

[0084] In one embodiment, the diaphragm 31 further includes a reinforcement portion disposed on the straight portion 314. As will be appreciated, the reinforcement portion effectively strengthens the structural strength of the diaphragm 31, thereby improving the connection stability between the first voice coil 32 and the second voice coil 33 and preventing the diaphragm 31 from tearing when the first and second voice coils 32, 33 drive the diaphragm 31 to vibrate.

[0085] In one embodiment, a avoiding structure 234 is provided on the periphery of the second common magnet 233 adjacent to the second magnetic gap 26 .

[0086] In this embodiment, if Figure 1 and Figure 2As shown, by setting an avoidance structure 234 on the edge of the second common magnet 233 of the common magnetic part 23, that is, setting a rounded corner, a chamfered corner, a cut corner or a step structure on the edge of the second common magnet 233, the diaphragm 31 can be avoided, and at the same time, magnetic leakage can be effectively prevented to improve the BL value.

[0087] Optionally, the avoidance structure 234 is at least one of an inclined surface, a rounded corner, a chamfered corner, and a step structure.

[0088] In one embodiment, the avoidance structure 234 may be an inclined surface. Optionally, the angle formed between the avoidance structure 234 and the surface of the second common magnet 233 facing away from the common magnetic conductive plate 232 is greater than 90° and less than 180°. In this embodiment, the angle formed between the inclined surface of the avoidance structure 234 and the surface of the second common magnet 233 facing away from the common magnetic conductive plate 232 may further be in the range of 100° to 150°, which is not limited here. Optionally, the angle is 100°, 110°, 120°, 130°, 140°, 150°, etc., which is not limited here.

[0089] It is understood that the avoidance structure 234 surrounds the circumference of the second common magnet 233 facing away from the common magnetic plate 232, that is, the avoidance structure 234 is a single, annular inclined surface. Of course, in other embodiments, the avoidance structure 234 includes multiple avoidance structures 234, with the multiple avoidance structures 234 spaced apart and surrounding the circumference of the second common magnet 233 facing away from the common magnetic plate 232. In this case, two adjacent avoidance structures 234 are not connected, but also have a certain distance between them. Alternatively, the avoidance structure 234 includes multiple adjacent avoidance structures 234, with the avoidance structures 234 connected end to end to form a closed annular structure, and surround the circumference of the second common magnet 233 facing away from the common magnetic plate 232. In this case, adjacent avoidance structures 234 in the multiple avoidance structures 234 are adjacent and form a single annular structure. Optionally, the angles formed by the multiple avoidance structures 234 with the surface of the second common magnet 233 facing away from the common magnetic plate 232 can be the same, different, or at least partially the same, and this is not limited here.

[0090] In one embodiment, the second magnetic yoke 212 includes a protrusion 2121 and an edge portion 2122 connected to the protrusion 2121. The inner ring portion 311 is connected to the edge portion 2122 so that the protrusion 2121 passes through the inner ring hole 312. The protrusion 2121 forms a recessed groove 2123 facing the central magnetic portion 22. The second central magnet 223 has a protrusion 224 that protrudes from the second common magnet 233. The protrusion 224 is accommodated and confined in the recessed groove 2123.

[0091] In this embodiment, if Figure 1 and Figure 2As shown, by setting the second magnetic yoke 212 as a protrusion 2121 passing through the inner ring hole 312, and setting an edge portion 2122 on the periphery of the protrusion 2121, it is convenient to connect the inner ring portion 311 of the diaphragm 31 with the edge portion 2122 to achieve sealing. It can be understood that when the sound-emitting device 100 is applied to an electronic device, in order to reduce the Z-direction height of the electronic device, the protrusion 2121 of the sound-emitting device 100 can be used to abut against the inner wall of the shell of the electronic device. There is no need to increase the front cavity space. The front sound cavity structure can be formed by utilizing the height difference between the protrusion 2121 and the vibration system 3, which is not limited here.

[0092] It can be understood that by providing the recessed groove 2123 on the raised portion 2121 of the second magnetic yoke 212, a portion of the second central magnet 223 is accommodated and confined within the recessed groove 2123. That is, the second central magnet 223 has a protruding portion 224 that protrudes from the second common magnet 233, and the protruding portion 224 is accommodated and confined within the recessed groove 2123. In this way, the second central magnet 223 of the central magnetic portion 22 can be used to support and secure the second magnetic yoke 212, and the thickness of the second central magnet 223 can be increased, thereby further increasing the magnetic field strength of the central magnetic portion 22.

[0093] In one embodiment, the common magnetic portion 23 is provided with an avoidance gap 235 connecting the first magnetic gap 25 and the second magnetic gap 26; the vibration system 3 also includes a skeleton 34, the skeleton 34 includes a main body 341 and a connecting portion 342 connected to the main body 341, the main body 341 is connected to the diaphragm 31, the connecting portion 342 is located in the avoidance gap 235, and the two ends of the connecting portion 342 are respectively connected to the first voice coil 32 and the second voice coil 33.

[0094] In this embodiment, if Figures 1 to 3 As shown, by setting the skeleton 34, the first voice coil 32 and the second voice coil 33 are connected to the diaphragm 31 through the skeleton 34, so that the first voice coil 32 and the second voice coil 33 can be ensured to be in a more reasonable magnetic field, that is, the area with the largest magnetic flux density, thereby effectively improving the BL value.

[0095] In one embodiment, the skeleton 34 includes a main body 341 and a connecting portion 342 . The main body 341 is connected to the diaphragm 31 . The connecting portion 342 is located in the avoidance gap 235 , so that both ends of the connecting portion 342 are connected to the first voice coil 32 and the second voice coil 33 respectively.

[0096] It can be understood that when there is only one skeleton 34, optionally, the main body 341 is arranged in a rectangular ring, and the connecting parts 342 include multiple, and the multiple connecting parts 342 are respectively arranged corresponding to the four corners of the main body 341, and the common magnetic part 23 is provided with an avoidance gap 235 corresponding to each connecting part 342.

[0097] In this embodiment, the main body 341 of the skeleton 34 is connected to the straight portion 314 of the diaphragm 31, and multiple connecting portions 342 are arranged at intervals. Optionally, the multiple connecting portions 342 are respectively arranged at the four corners of the main body 341. The common magnetic portion 23 is provided with a clearance gap 235 corresponding to each connecting portion 342, so that each connecting portion 342 is located within a clearance gap 235. Optionally, the four corners of the common magnetic portion 23 are each provided with a clearance gap 235.

[0098] Of course, the skeleton 34 may also include multiple skeletons, for example, the skeleton 34 includes two or four skeletons. Optionally, the skeleton 34 includes two, and the diaphragm 31 has two long axis sides and two short axis sides connected end to end; the two skeletons 34 are arranged at intervals along the long axis sides or the short axis sides and are symmetrically arranged. Each skeleton 34 includes a main body 341 and two connecting parts 342. Optionally, the skeleton 34 includes four, and the four skeletons 34 are respectively arranged corresponding to the four corners of the common magnetic part 23. Each skeleton 34 includes a main body 341 and a connecting part 342.

[0099] In this embodiment, the side magnetic portions 24 and the common magnetic portion 23 may each be configured as a rectangular frame. Optionally, each corner of the common magnetic portion 23 is provided with an escape notch 235. Optionally, the number of connecting portions 342 of the skeleton 34 matches the number of escape notches 235, and the number of such notches is arranged in a one-to-one correspondence, which is not limited herein.

[0100] In one embodiment, if Figure 1 and Figure 5 As shown, a first connecting surface 3421 and a second connecting surface 3422 are respectively provided at both ends of the connecting portion 342 . The first connecting surface 3421 is connected to the first voice coil 32 , and the second connecting surface 3422 is connected to the second voice coil 33 .

[0101] In this embodiment, the first connecting surface 3421 is connected to the outer sidewall of the first voice coil 32. The first connecting surface 3421 is disposed at a corner of the first voice coil 32 and may optionally be a concave arc surface. The second connecting surface 3422 is connected to the inner sidewall of the second voice coil 33. The second connecting surface 3422 is disposed at a corner of the second voice coil 33 and may optionally be a convex arc surface, which is not limited herein.

[0102] In one embodiment, an escape space 13 is formed between the edge magnet portion 24 and the outer shell 1; the vibration system 3 also includes a centering support piece 35, one end of the centering support piece 35 is connected to the outer shell 1, and the other end of the centering support piece 35 is located in the escape space 13; the skeleton 34 includes an extension portion 343, one end of the extension portion 343 is connected to the periphery of the main body portion 341, and the other end of the extension portion 343 extends toward the centering support piece 35 and is connected to the centering support piece 35.

[0103] In this embodiment, if Figure 1 and Figure 3 As shown, by providing a clearance space 13 between the housing 1 and the edge magnet portion 24 and disposing a centering damper 35, the centering damper 35 is secured to the housing 1, with one end of the centering damper 35 extending into the clearance space 13. An extension 343 is provided on the frame 34, extending toward and connecting to the centering damper 35. As a result, the leads of the first and second voice coils 32 and 33 are guided through the frame 34 to the centering damper 35, then to the housing 1 via the centering damper 35, where they are connected to the external circuit. The frame 34 not only connects and secures the first and second voice coils 32 and 33 but also prevents them from swinging or polarizing during vibration.

[0104] It can be understood that by providing the centering support plate 35, the centering support plate 35 can be used to connect the leads of the first voice coil 32 and the second voice coil 33 to the external circuit, and the centering support plate 35 can also be used to avoid problems such as swinging or polarization of the first voice coil 32 and the second voice coil 33 during vibration.

[0105] In one embodiment, the housing 1 has a long side 11 and a short side 12 connected end to end, and the two centering supports 35 are symmetrically arranged and respectively corresponding to the two long sides 11 or the two short sides 12 .

[0106] In this embodiment, if Figure 1 and Figure 3 As shown, two centering supports 35 are symmetrically arranged along the two long sides 11 or the two short sides 12 of the housing 1. Each centering support 35 includes an outer fixing portion, an elastic wall portion, and an inner fixing portion, which are connected in sequence. The outer fixing portion is connected to the housing 1 and / or the edge magnetic portion 24, and the inner fixing portion is connected to the extension portion 343. The inner fixing portion is provided with an inner solder pad. The leads of the first voice coil 32 and the second voice coil 33 extend along the extension portion 343 to the inner solder pad.

[0107] In this embodiment, if Figure 1 and Figure 3 As shown, the outer fixing portion, the elastic wall portion, and the inner fixing portion of the centering support 35 can be integrally formed. This effectively ensures the structural strength of the centering support 35 while simplifying the processing steps for the centering support 35. It will be appreciated that to ensure the deformability of the centering support 35, the elastic wall portion has at least one bend.

[0108] Optionally, the outer fixing portion, the elastic wall portion, and the inner fixing portion of the centering support 35 may be located in the same plane. Of course, in other embodiments, the outer fixing portion and the inner fixing portion of the centering support 35 may also be located in different planes.

[0109] In one embodiment, the first central magnet 221 and the second central magnet 223 are both magnetized along the vibration direction of the vibration system 3, and the magnetic poles of the first central magnet 221 and the second central magnet 223 near the central magnetic plate 222 are the same; the first common magnet 231 and the second common magnet 233 are both magnetized along the vibration direction of the vibration system 3, and the magnetic poles of the first common magnet 231 and the second common magnet 233 near the common magnetic plate 232 are the same; the magnetic poles of the first central magnet 221 and the second central magnet 223 near the central magnetic plate 222 are opposite to the magnetic poles of the first common magnet 231 and the second common magnet 233 near the common magnetic plate 232.

[0110] In this embodiment, if Figure 1 and Figure 2 As shown, the vibration direction of the vibration system 3 can be selected as the vertical direction. Optionally, the first common magnet 231 and the second common magnet 233 of the common magnetic part 23 are magnetized in the vertical direction, and the first central magnet 221 and the second central magnet 223 of the central magnetic part 22 are magnetized in the vertical direction.

[0111] It should be noted that Figure 2 The arrows in the illustrated magnetic circuit system 2 are from the south pole to the north pole, i.e., the magnetization direction. The first central magnet 221 and the second central magnet 223 of the central magnetic portion 22 are both magnetized vertically in opposite directions; the first common magnet 231 and the second common magnet 233 of the common magnetic portion 23 are both magnetized vertically in opposite directions. As will be appreciated, this arrangement allows the central magnetic portion 22, the common magnetic portion 23, and the side magnetic portion 24 to form a magnetic circuit that passes through the first and second voice coils 32, 33 within the first and second magnetic gaps 25, 26.

[0112] It can be understood that the magnetization direction of the first central magnet 221 is opposite to the magnetization direction of the second central magnet 223. In this way, the magnetic flux lines of the first central magnet 221 and the second central magnet 223 of the central magnetic portion 22 are concentrated on the central magnetic conductive plate 22. The central magnetic portion 22 generates a magnetic field with a strong magnetic field strength that passes through the first magnetic gap 25, thereby increasing the density of the magnetic flux in the first magnetic gap 25, increasing the number of magnetic flux lines passing through the first voice coil 32, and increasing the magnetic field force on the first voice coil 32, thereby effectively improving the BL value. At the same time, the magnetization direction of the first common magnet 231 is opposite to that of the second common magnet 233. This causes the magnetic flux lines of the first common magnet 231 and the second common magnet 233 of the common magnetic portion 23 to converge on the common magnetic conductive plate 232. The common magnetic portion 23 generates a magnetic field with a relatively strong magnetic field strength that passes through the first magnetic gap 25 and the second magnetic gap 26, thereby increasing the density of the magnetic flux in the first magnetic gap 25 and the second magnetic gap 26, increasing the number of magnetic flux lines passing through the first voice coil 32 and the second voice coil 33, and increasing the magnetic field force acting on the first voice coil 32 and the second voice coil 33, thereby effectively improving the BL value.

[0113] In this embodiment, when the first central magnet 221 is magnetized from top to bottom, the second central magnet 223 is magnetized from bottom to top, the first common magnet 231 is magnetized from bottom to top, and the second common magnet 233 is magnetized from top to bottom. That is, the north pole of the first central magnet 221 is at the bottom and the south pole is at the top, the north pole of the second central magnet 223 is at the top and the south pole is at the bottom, the north pole of the first common magnet 231 is at the top and the south pole is at the bottom, and the north pole of the second common magnet 233 is at the bottom and the south pole is at the top, and vice versa.

[0114] It is understood that the first central magnet 221 and the second central magnet 223 have the same magnetic poles near the central magnetic plate 222, that is, the magnetic poles of the first central magnet 221 and the second central magnet 223 near the central magnetic plate 222 are both north poles or south poles. The first common magnet 231 and the second common magnet 233 have the same magnetic poles near the common magnetic plate 232, that is, the magnetic poles of the first common magnet 231 and the second common magnet 233 near the common magnetic plate 232 are both south poles or north poles.

[0115] In this embodiment, when the magnetic poles of the first central magnet 221 and the second central magnet 223 close to the central magnetic conductive plate 222 are both N poles, the magnetic poles of the first common magnet 231 and the second common magnet 233 close to the common magnetic conductive plate 232 are both S poles, and vice versa. Such an arrangement allows the central magnetic portion 22 and the side magnetic portion 24 to form a magnetic circuit for the first voice coil 32 passing through the first magnetic gap 25 and the second magnetic gap 26, which is not limited here.

[0116] In one embodiment, the first central magnet 221 includes multiple first central magnets 221, which are arranged adjacent to each other and located between the central magnetic plate 222 and the first magnetic yoke 211 of the magnetic yoke 21; wherein the multiple first central magnets 221 are all magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple first central magnets 221 are the same.

[0117] Optionally, multiple first central magnets 221 are arranged flat between the first magnetic yoke 211 and the central magnetic plate 222 of the magnetic yoke 21. The multiple first central magnets 221 are magnetized vertically, and the magnetization directions of the multiple first central magnets 221 are the same. That is, the multiple first central magnets 221 are magnetized in the direction of movement of the first voice coil 32, and the multiple first central magnets 221 can be magnetized simultaneously upward or downward, without limitation.

[0118] In one embodiment, the second central magnet 223 includes multiple second central magnets 223, which are arranged adjacent to each other and located on the side of the central magnetic conductive plate 222 facing away from the first central magnet 221; wherein the multiple second central magnets 223 are all magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple second central magnets 223 are the same.

[0119] Optionally, multiple second central magnets 223 are arranged flat on the side of the central magnetic conductive plate 222 facing away from the first central magnet 221. The multiple second central magnets 223 are magnetized vertically, and the magnetization direction of the multiple second central magnets 223 is the same. That is, the multiple second central magnets 223 are magnetized in the direction of movement of the first voice coil 32, and the multiple second central magnets 223 can be magnetized simultaneously upward or downward, without limitation.

[0120] In one embodiment, the first common magnet 231 includes multiple first common magnets 231, which are arranged adjacent to each other and located between the common magnetic plate 232 and the first magnetic yoke 211 of the magnetic yoke 21; wherein the multiple first common magnets 231 are all magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple first common magnets 231 are the same.

[0121] Optionally, multiple first shared magnets 231 are arranged flat between the first magnetic yoke 211 of the magnetic yoke 21 and the shared magnetic plate 232. The multiple first shared magnets 231 are magnetized vertically, and the magnetization directions of the multiple first shared magnets 231 are the same. That is, the multiple first shared magnets 231 are magnetized in the direction of movement of the first voice coil 32, and the multiple first shared magnets 231 can be magnetized simultaneously upward or downward, without limitation.

[0122] In one embodiment, the second common magnet 233 includes a plurality of second common magnets 233, which are arranged adjacent to each other and located on the side of the common magnetic conductive plate 232 facing away from the first common magnet 231; wherein the plurality of second common magnets 233 are all magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the plurality of second common magnets 233 are the same.

[0123] Optionally, multiple second shared magnets 233 are arranged flat on the side of the shared magnetic plate 232 facing away from the first shared magnet 231. The multiple second shared magnets 233 are all magnetized vertically, and the magnetization direction of the multiple second shared magnets 233 is the same. That is, the multiple second shared magnets 233 are all magnetized in the direction of movement of the first voice coil 32, and the multiple second shared magnets 233 can be magnetized simultaneously upward or downward, without limitation.

[0124] In one embodiment, the edge magnetic portion 24 includes a stacked edge magnet 241 and a edge magnetic plate 242, the edge magnet 241 is connected to the magnetic yoke 21, and the edge magnetic plate 242 is connected to the outer shell 1; wherein, the edge magnet 241 is magnetized along the vibration direction of the vibration system 3, the magnetic pole of the edge magnet 241 close to the edge magnetic plate 242 is the same as the magnetic pole of the first center magnet 221 close to the center magnetic plate 222, and the magnetic pole of the edge magnet 241 close to the edge magnetic plate 242 is opposite to the magnetic pole of the first common magnet 231 close to the common magnetic plate 232.

[0125] In this embodiment, if Figure 2 As shown, the magnetization direction of the side magnets 241 of the side magnet portion 24 is the same as the magnetization direction of the first central magnet 221, and opposite to the magnetization direction of the first common magnet 231. Optionally, the magnetic poles of the side magnets 241 near the side magnetic conductive plate 242 are the same as the magnetic poles of the first central magnet 221 near the central magnetic conductive plate 222, and the magnetic poles of the side magnets 241 near the side magnetic conductive plate 242 are opposite to the magnetic poles of the first common magnet 231 near the common magnetic conductive plate 232, which is not limited here.

[0126] It is understood that when the first central magnet 221 is magnetized from bottom to top, the side magnets 241 are magnetized from bottom to top; alternatively, when the first central magnet 221 is magnetized from top to bottom, the side magnets 241 are magnetized from top to bottom, without limitation. That is, when the north pole of the first central magnet 221 is at the top and the south pole is at the bottom, the north pole of the side magnet 241 is at the top and the south pole is at the bottom; alternatively, when the north pole of the first central magnet 221 is at the bottom and the south pole is at the top, the north pole of the side magnet 241 is at the bottom and the south pole is at the top, without limitation.

[0127] Optionally, the side magnetic conductive plate 242 of the side magnetic portion 24 can be bonded to the housing 1. In this embodiment, the side magnetic conductive plate 242 and the housing 1 can be integrally formed.

[0128] In one embodiment, at least a portion of the projection of the common magnetic conductive plate 232 along the vibration direction perpendicular to the vibration system 3 coincides with the projections of the first voice coil 32 and the second voice coil 33 along the vibration direction perpendicular to the vibration system 3 .

[0129] As can be understood, this arrangement causes the magnetic flux lines of the first common magnet 231 and the second common magnet 233 of the common magnetic portion 23 to converge on the common magnetic conductive plate 232 and pass through the first magnetic gap 25 and the second magnetic gap 26, thereby increasing the density of the magnetic flux in the first magnetic gap 25 and the second magnetic gap 26, placing the first voice coil 32 and the second voice coil 33 in a more reasonable magnetic field, thereby alleviating distortion of the audio output by the sound-generating device 100 and improving the sound quality of the audio output by the sound-generating device 100. Optionally, the horizontal projection of the common magnetic conductive plate 232 is located within the horizontal projection of the first voice coil 32 and the second voice coil 33.

[0130] Optionally, the thickness of the common magnetic conductive plate 232 is less than or equal to the thickness of the first common magnet 231 , and the thickness of the common magnetic conductive plate 232 is less than or equal to the thickness of the second common magnet 233 , which is not limited here.

[0131] In one embodiment, a projection of at least a portion of the central magnetic conductive plate 222 along a vibration direction perpendicular to the vibration system 3 coincides with a projection of the first voice coil 32 along a vibration direction perpendicular to the vibration system 3 .

[0132] As can be understood, this arrangement causes the magnetic flux lines of the first central magnet 221 and the second central magnet 223 of the central magnetic portion 22 to converge on the central magnetic plate 222 and pass through the first magnetic gap 25, thereby increasing the density of the magnetic flux in the first magnetic gap 25 and placing the first voice coil 32 in a more reasonable magnetic field, thereby alleviating distortion of the audio output by the sound-generating device 100 and improving the sound quality of the audio output by the sound-generating device 100. Optionally, the horizontal projection of the central magnetic plate 222 is located within the horizontal projection of the first voice coil 32.

[0133] Optionally, the thickness of the central magnetic conductive plate 222 is less than or equal to the thickness of the first central magnet 221, and the thickness of the central magnetic conductive plate 222 is less than or equal to the thickness of the second central magnet 223, without limitation. In this embodiment, the thickness of the central magnetic conductive plate 222 is optionally equivalent to the thickness of the shared magnetic conductive plate 232.

[0134] In this embodiment, if Figure 1 and Figure 2 As shown, the thickness of the first central magnet 221 along the vibration direction of the vibration system 3 may be the same as the thickness of the first common magnet 231 along the vibration direction of the vibration system 3. Optionally, the thickness of the central magnetic conductive plate 222 along the vibration direction of the vibration system 3 may be the same as the thickness of the side magnetic conductive plates 242 along the vibration direction of the vibration system 3.

[0135] In one embodiment, the thickness of the second central magnet 223 along the vibration direction of the vibration system 3 is greater than or equal to the thickness of the second common magnet 233 along the vibration direction of the vibration system 3. That is, the side surface of the second central magnet 223 facing away from the central magnetic conductive plate 222 protrudes from the side surface of the second common magnet 233 facing away from the common magnetic conductive plate 232 to form a protrusion 224.

[0136] It can be understood that the vibration system 3 is provided with a through structure for the protrusion to pass through. In this way, when the sound-generating device 100 is applied to an electronic device, in order to reduce the Z-direction height of the electronic device, the protrusion 224 of the magnetic circuit system 2 in the sound-generating device 100 can be used to abut against the inner wall of the shell of the electronic device. There is no need to increase the front cavity space. The front sound cavity structure can be formed by utilizing the height difference between the protrusion 224 of the magnetic circuit system 2 and the vibration system 3, which is not limited here.

[0137] Of course, in other implementations, the thickness of the second central magnet 223 along the direction of movement of the first voice coil 32 may be the same as the thickness of the second common magnet 233 along the direction of movement of the first voice coil 32. The diaphragm 31 of the vibration system 3 and the central magnetic portion 22 are disposed opposite and spaced apart from each other; or, the diaphragm 31 of the vibration system 3 and the central magnetic portion 22 are connected and sealed, which is not limited here.

[0138] In one embodiment, the common magnetic portion 23 includes a plurality of common magnetic portions 23 , which are disposed around the outer side of the central magnetic portion 22 , and adjacent common magnetic portions 23 are connected end to end to form a closed ring structure.

[0139] It can be understood that each of the multiple common magnetic parts 23 includes a first common magnet 231, a common magnetic conductive plate 232 and a second common magnet 233 that are stacked. At this time, adjacent first common magnets 231 in adjacent common magnetic parts 23 are connected end to end to form a closed annular structure, adjacent common magnetic conductive plates 232 are connected end to end to form a closed annular structure, and adjacent second common magnets 233 are connected end to end to form a closed annular structure, so that multiple common magnetic parts 23 are connected end to end to form a closed annular structure, which is not limited here.

[0140] In one embodiment, if Figure 1 and Figure 3 As shown, the common magnetic portion 23 includes a plurality of common magnetic portions 23 , which are disposed around the outer side of the central magnetic portion 22 , and adjacent common magnetic portions 23 are spaced apart to form gaps.

[0141] It is understood that each of the multiple shared magnetic portions 23 includes a first shared magnet 231, a shared magnetic conductive plate 232, and a second shared magnet 233 that are stacked. In this case, adjacent first shared magnets 231 in adjacent shared magnetic portions 23 are spaced apart to form a gap, adjacent shared magnetic conductive plates 232 are spaced apart to form a gap, and adjacent second shared magnets 233 are spaced apart to form a gap, so that the multiple shared magnetic portions 23 are spaced apart and surround each other to form a ring structure with gaps, which is not limited here. Optionally, the gaps formed by the spacing between adjacent shared magnetic portions 23 are avoidance gaps 235.

[0142] In this embodiment, the first common magnet 231 and the second common magnet 233 of the common magnetic portion 23 may be permanent magnets. It is understood that the first common magnet 231, the common magnetic plate 232, and the second common magnet 233 of the common magnetic portion 23 are stacked along the moving direction of the first voice coil 32. That is, the first common magnet 231 is connected to the first magnetic yoke 211 of the magnetic yoke 21, the second common magnet 233 is connected to the second magnetic yoke 212 of the magnetic yoke 21, the common magnetic plate 232 is stacked between the first common magnet 231 and the second common magnet 233, and the second common magnet 233 is stacked on the side of the common magnetic plate 232 facing away from the first common magnet 231.

[0143] In one embodiment, the sound-emitting device 100 is installed in the shell 400 of the sound-emitting module 500, and forms a front cavity 420 and a rear cavity 430 between the shell 400. The shell 400 is provided with a sound outlet hole 410 connected to the front cavity 420, and the sound waves of the diaphragm 31 are radiated to the outside through the sound outlet hole 410; wherein, the volume of the rear cavity 430 is ≤1.5cc.

[0144] In this embodiment, if Figure 6 As shown, the housing 400 of the sound module 500 has an installation space, and the sound device 100 is disposed within the installation space of the housing 400, forming a front cavity 420 and a rear cavity 430 separated from the housing 400. To facilitate the smooth transmission of the sound generated by the diaphragm 31 of the sound device 100 to the outside world, the housing 400 is provided with a sound outlet 410 connected to the front cavity 420, so that the sound waves of the diaphragm 31 are radiated to the outside world through the sound outlet 410.

[0145] As will be appreciated, to balance the air pressure within the sound-generating device 100, the sound-generating device 100 is also provided with a pressure relief hole. Thus, when the diaphragm 31 vibrates, sound waves on the side of the diaphragm 31 facing away from the front cavity 420 are radiated through the pressure relief hole to the rear cavity 430, thereby balancing the air pressure on both sides of the diaphragm 31. Optionally, the pressure relief hole is provided on the housing 1 of the sound-generating device 100; alternatively, the pressure relief hole is provided on the magnetic yoke 21 of the magnetic circuit system 2 of the sound-generating device 100, without limitation. In this embodiment, the pressure relief hole is optionally provided on the first magnetic yoke 211 of the magnetic yoke 21 of the magnetic circuit system 2.

[0146] In this embodiment, the sound device 100 is installed in the housing 400 of the sound module 500, and the volume of the rear cavity 430 is optionally less than or equal to 1.5cc. Optionally, the volume of the rear cavity 430 is 1.5cc, 1.4cc, 1.3cc, 1.2cc, 1.1cc, 1cc, 0.9cc, 0.8cc, 0.7cc, 0.6cc, 0.5cc, 0.4cc, 0.3cc, 0.2cc, 0.1cc, etc., without limitation herein.

[0147] It can be understood that by setting the magnetic circuit system 2 of the sound-emitting device 100 to include a magnetic yoke 21 and a central magnetic portion 22, a common magnetic portion 23 and a side magnetic portion 24 provided on the magnetic yoke, the central magnetic portion 22 and the side magnetic portion 24 share the common magnetic portion 23, forming a first magnetic gap 25 and a second magnetic gap 26 respectively, and setting the vibration system 3 to an inner and outer double voice coil structure, the first voice coil 32 is arranged corresponding to the first magnetic gap 25, and the second voice coil 33 is arranged corresponding to the second magnetic gap 26. In this way, current is passed through the first voice coil 32 and the second voice coil 33, so that the two voice coils vibrate in the magnetic fields of the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2 respectively and drive the diaphragm 31 to vibrate and produce sound, so as to improve the BL value. At the same time, the first voice coil 32 and the second voice coil 33 can make full use of the magnetic fields of the central magnetic portion 22 and the common magnetic portion 23, improve the magnetic energy utilization rate of the magnetic circuit system 2, thereby improving the loudness and sensitivity of the sound-emitting device 100, thereby improving product performance.

[0148] The present invention also provides an electronic device including the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is similar to that of the aforementioned embodiments. Since the present electronic device utilizes all the technical solutions of all the aforementioned embodiments, it at least has all the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and thus will not be described in detail here.

[0149] In one embodiment, the electronic device further comprises a device housing having an installation space, and the sound generating device 100 is disposed in the installation space of the device housing. Of course, in other embodiments, the electronic device may comprise a sound generating module 500, which is not limited here.

[0150] In this embodiment, the electronic device further includes a flexible circuit board (FPCB). One end of the FPCB is electrically connected to the sound-generating device 100, and the other end is used to connect to an external power source. As will be appreciated, the FPCB is used to electrically connect the external circuit to the first voice coil 32 and the second voice coil 33 of the sound-generating device 100. The FPCB has inner and outer solder pads. The inner pads are electrically connected to the sound-generating device 100, while the outer pads are used to connect to external terminals.

[0151] In this embodiment, the device housing has an installation space, the sound-generating device 100 is disposed within the installation space of the device housing, and at least one end of the flexible printed circuit board connected to the sound-generating device 100 is located within the installation space of the device housing. Of course, in other embodiments, the entire flexible printed circuit board may be disposed within the installation space of the device housing, and this is not limited here.

[0152] It is understood that the electronic device can be a headset, a mobile phone, an MP3, an MP4, a computer, a tablet computer, a smart wearable device, etc., and is not limited here. In the electronic device, the sound device 100 can be assembled into the housing of the electronic device in a module or in a single unit.

[0153] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention specification and drawings, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: The sound-generating device comprises: shell; a magnetic circuit system connected to one end of the housing, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion, a common magnetic portion, and an edge magnetic portion provided on the magnetic yoke, the common magnetic portion being located outside the central magnetic portion and spaced apart from the central magnetic portion to form a first magnetic gap, the edge magnetic portion being located outside the common magnetic portion and spaced apart from the common magnetic portion to form a second magnetic gap, the first magnetic gap and the second magnetic gap being coaxially arranged, the central magnetic portion comprising a first central magnet, a central magnetic plate, and a second central magnet arranged in a stacked manner, and the common magnetic portion comprising a first common magnet, a common magnetic plate, and a second common magnet arranged in a stacked manner; and a vibration system comprising a diaphragm and a first voice coil and a second voice coil connected to the diaphragm, wherein the diaphragm is centrally provided with an inner ring hole, an outer periphery of the diaphragm is connected to the housing, and an inner periphery of the diaphragm is connected to the magnetic circuit system, the first voice coil is disposed corresponding to the first magnetic gap, and the second voice coil is disposed corresponding to the second magnetic gap; The first central magnet, the central magnetic conductive plate and the second central magnet respectively correspond to the first common magnet, the common magnetic conductive plate and the second common magnet in a one-to-one manner in a vibration direction perpendicular to the vibration system.

2. The sound-generating device according to claim 1, wherein: The magnetically conductive yoke includes a first magnetic yoke and a second magnetic yoke, wherein the central magnetic portion, the common magnetic portion, and the side magnetic portion are all provided on the first magnetic yoke, the second magnetic yoke is connected to the central magnetic portion and the common magnetic portion at one end away from the first magnetic yoke, the first central magnet and the first common magnet are connected to the first magnetic yoke, and the second central magnet and the second common magnet are connected to the second magnetic yoke; The inner periphery of the diaphragm is connected to the second magnetic yoke so that a portion of the second magnetic yoke corresponds to the inner annular hole.

3. The sound-generating device according to claim 2, wherein: The diaphragm includes an inner ring portion, a first fold ring arranged around the inner ring portion, a straight portion arranged around the first fold ring, a second fold ring arranged around the straight portion, and a fixing portion connected to the outer side of the second fold ring, the fixing portion is connected to the outer shell, the inner ring portion is formed with the inner ring hole, and the inner ring portion is connected to the periphery of the second magnetic yoke.

4. The sound-generating device according to claim 3, wherein: The inner ring portion, the first fold ring, the straight portion, the second fold ring and the fixing portion are an integrally formed structure; And / or, the protruding direction of the first fold ring is opposite to the protruding direction of the second fold ring; And / or, a avoidance structure is provided on the periphery of the second common magnet adjacent to the second magnetic gap; And / or, the second magnetic yoke includes a protrusion and an edge portion connected to the protrusion, the inner ring portion is connected to the edge portion so that the protrusion passes through the inner ring hole, the protrusion forms a recessed groove facing the central magnetic portion, and the second central magnet has a protrusion protruding from the second common magnet, and the protrusion is accommodated and confined in the recessed groove.

5. The sound-generating device according to claim 1, wherein: The common magnetic portion is provided with an escape gap connecting the first magnetic gap and the second magnetic gap; The vibration system also includes a skeleton, which includes a main body and a connecting part connected to the main body. The main body is connected to the diaphragm, and the connecting part is located in the avoidance gap. Both ends of the connecting part are respectively connected to the first voice coil and the second voice coil.

6. The sound-generating device according to claim 5, wherein: An escape space is formed between the edge magnetic portion and the shell; The vibration system further includes a centering support plate, one end of which is connected to the housing, and the other end of which is located in the avoidance space; The skeleton includes an extension portion, one end of which is connected to the periphery of the main body portion, and the other end of which extends toward the centering support piece and is connected to the centering support piece.

7. The sound-generating device according to claim 6, wherein: The main body is arranged in a rectangular ring, the connecting parts include a plurality of connecting parts, the plurality of connecting parts are respectively arranged corresponding to the four corners of the main body, and the common magnetic part is provided with an avoidance notch corresponding to each of the connecting parts; And / or, a first connecting surface and a second connecting surface are respectively provided at both ends of the connecting portion, the first connecting surface is connected to the first voice coil, and the second connecting surface is connected to the second voice coil; And / or, the shell has a long side and a short side connected end to end, and the centering support plates include two, and the two centering support plates are symmetrically arranged and respectively corresponding to the two long sides or the two short sides.

8. The sound generating device according to any one of claims 1 to 7, characterized in that: The first central magnet and the second central magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles of the first central magnet and the second central magnet close to the central magnetic conductive plate are the same; The first common magnet and the second common magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles of the first common magnet and the second common magnet close to the common magnetic conductive plate are the same; The magnetic poles of the first central magnet and the second central magnet close to the central magnetic conductive plate are opposite to the magnetic poles of the first common magnet and the second common magnet close to the common magnetic conductive plate.

9. The sound-generating device according to claim 8, wherein: The edge magnetic portion includes a stacked edge magnet and a edge magnetic conductive plate, the edge magnet is connected to the magnetic conductive yoke, and the edge magnetic conductive plate is connected to the housing; In which, the side magnets are magnetized along the vibration direction of the vibration system, the magnetic poles of the side magnets close to the side magnetic conductive plates are the same as the magnetic poles of the first center magnet close to the center magnetic conductive plates, and the magnetic poles of the side magnets close to the side magnetic conductive plates are opposite to the magnetic poles of the first common magnet close to the common magnetic conductive plates.

10. The sound-generating device according to claim 9, wherein: The projection of at least part of the common magnetic conductive plate along the vibration direction perpendicular to the vibration system coincides with the projections of the first voice coil and the second voice coil along the vibration direction perpendicular to the vibration system; And / or, a projection of at least part of the central magnetic conductive plate along a vibration direction perpendicular to the vibration system coincides with a projection of the first voice coil along the vibration direction perpendicular to the vibration system; And / or, the thickness of the first central magnet along the vibration direction of the vibration system is the same as the thickness of the first common magnet along the vibration direction of the vibration system; And / or, the thickness of the second central magnet along the vibration direction of the vibration system is greater than or equal to the thickness of the second common magnet along the vibration direction of the vibration system; And / or, the thickness of the central magnetic conductive plate along the vibration direction of the vibration system is the same as the thickness of the side magnetic conductive plates along the vibration direction of the vibration system; And / or, the side magnetic conductive plate and the shell are an integrally formed structure.

11. The sound generating device according to any one of claims 1 to 7, characterized in that: The edge magnetic portion forms a closed integral annular structure; Alternatively, the edge magnetic portion includes a plurality of edge magnetic portions, and adjacent edge magnetic portions are connected end to end to form a closed ring structure; Alternatively, the edge magnetic portion includes a plurality of edge magnetic portions, and there is a gap between adjacent edge magnetic portions.

12. The sound generating device according to any one of claims 1 to 7, characterized in that: The sound-generating device is installed in the shell of the sound-generating module, and forms a front cavity and a rear cavity between the shell and the sound-generating device. The shell is provided with a sound outlet hole connected to the front cavity, and the sound waves of the diaphragm are radiated to the outside world through the sound outlet hole, wherein the volume of the rear cavity is ≤1.5cc.

13. An electronic device, characterized in that: The electronic device includes the sound emitting device according to any one of claims 1 to 12.

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