Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a magnetic circuit system of the sound production device comprises a magnetic conductive yoke, a central magnetic part and an edge magnetic part, the central magnetic part comprises a first magnetic group, a second magnetic group, a third magnetic group and a fourth magnetic group, the second magnetic group comprises an inner magnetic group and an outer magnetic group which are flatly laid between the first magnetic group and the third magnetic group, the outer magnetic group is arranged around the inner magnetic group, and the vibration system comprises a vibrating diaphragm and a voice coil; wherein the first magnetic group, the outer magnetic group and the fourth magnetic group are magnetized in the vibration direction of the vibration system, the inner magnetic group and the third magnetic group are magnetized in the direction perpendicular to the vibration direction of the vibration system, and the center magnetic part is provided with a weight reduction space. According to the sound production device, the central magnetic part of the magnetic circuit system is optimized, so that the magnetic induction lines are effectively gathered in the magnetic gap, the BL value is increased, the sensitivity of the sound production device is improved, the sound effect of the whole machine is improved, and the weight of the whole machine is reduced while the magnetic field intensity is not lost.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducer, and in particular to a sound-generating device and electronic equipment using the sound-generating device. Background Art

[0002] In recent years, convenient electronic devices (such as mobile phones, headphones, and computers) have become part of people's daily lives. With the rapid development of technology, people's demands for the sound quality and sensitivity of speakers in electronic devices are getting higher and higher, and full-range and miniaturized speakers have become mainstream demands.

[0003] At present, the box space in electronic devices is getting smaller and smaller, and the BL value of the sound-generating device is limited by the space size, resulting in a small number of magnetic lines passing through the voice coil in the speaker, which leads to a smaller magnetic field force on the voice coil, making the sound-generating device low in sensitivity and poor in overall acoustic performance and sound effects. Summary of the invention

[0004] The main purpose of the present invention is to provide a sound-generating device and an electronic device, aiming to provide a sound-generating device that effectively improves the BL value. The sound-generating device optimizes the central magnetic part of the magnetic circuit system, designs and adjusts the position and magnetic induction direction of the magnet, so that the magnetic flux lines are effectively gathered in the magnetic gap, thereby increasing the BL value of the sound-generating device, improving the sensitivity of the sound-generating device, and then improving the sound effect of the whole machine, and reducing the weight of the whole machine without losing the magnetic field strength.

[0005] To achieve the above object, the present invention provides a sound-generating device, comprising:

[0006] A magnetic circuit system, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion and a side magnetic portion arranged on the magnetic yoke, the side magnetic portion being located outside the central magnetic portion and spaced apart from the central magnetic portion to form a magnetic gap, the central magnetic portion comprising a first magnetic group, a second magnetic group, a third magnetic group and a fourth magnetic group sequentially stacked on the magnetic yoke, the second magnetic group comprising an inner magnetic group and an outer magnetic group laid flat between the first magnetic group and the third magnetic group, the outer magnetic group being arranged around the inner magnetic group; and

[0007] A vibration system, the vibration system comprising a diaphragm and a voice coil connected to the diaphragm, one end of the voice coil being suspended in the magnetic gap;

[0008] Among them, the first magnetic group, the outer magnetic group and the fourth magnetic group are all magnetized along the vibration direction of the vibration system, the inner magnetic group and the third magnetic group are all magnetized along the vibration direction perpendicular to the vibration direction of the vibration system, the magnetic pole of the first magnetic group close to the second magnetic group is the same as the magnetic pole of the outer magnetic group close to the third magnetic group, the magnetic pole of the first magnetic group close to the second magnetic group is the same as the magnetic pole of the fourth magnetic group close to the third magnetic group, the magnetic pole of the third magnetic group close to the magnetic gap is the same as the magnetic pole of the inner magnetic group close to the outer magnetic group, the magnetic pole of the first magnetic group close to the second magnetic group is the same as the magnetic pole of the third magnetic group close to the magnetic gap, and the central magnetic part is provided with a weight reduction space.

[0009] In one embodiment, the weight-reducing space is provided in the center of the first magnetic group;

[0010] And / or, the weight reduction space is provided in the center of the second magnetic group;

[0011] And / or, the weight reduction space is provided in the center of the third magnetic group;

[0012] And / or, the weight reduction space is provided in the center of the fourth magnetic group;

[0013] And / or, the weight reduction space is a through hole or a groove.

[0014] In one embodiment, the first magnetic group is provided with a first weight-reducing hole, the inner magnetic group is provided with a second weight-reducing hole, the first weight-reducing hole is correspondingly connected with the second weight-reducing hole, and cooperates to form the weight-reducing space;

[0015] The magnetic conductive yoke is provided with a third weight-reducing hole corresponding to the first weight-reducing hole, and the third weight-reducing hole is correspondingly connected to the weight-reducing space.

[0016] In one embodiment, the magnetically conductive yoke is provided with a magnetically conductive column located in the weight-reducing space;

[0017] The magnetic conductive column is an integral cylindrical structure, and the magnetic conductive column of the cylindrical structure is arranged around the third weight-reducing hole and abuts against the first magnetic group and the inner magnetic group; or, the magnetic conductive column includes a plurality of magnetic conductive columns, and the plurality of magnetic conductive columns are arranged around the third weight-reducing hole and abut against the first magnetic group and the inner magnetic group respectively;

[0018] And / or, one end of the magnetically conductive column away from the magnetically conductive yoke abuts against the third magnetic group.

[0019] In one embodiment, the first magnetic group is provided with a plurality of the first weight-reducing holes, the inner magnetic group is provided with a plurality of the second weight-reducing holes, and the plurality of the first weight-reducing holes and the plurality of the second weight-reducing holes are arranged in one-to-one correspondence to form a plurality of the weight-reducing spaces.

[0020] In one embodiment, the first magnetic group includes a first magnet, and the first magnet forms a closed integral annular structure to form the first weight-reducing hole in the center of the first magnetic group; or, the first magnetic group includes a plurality of first magnets, and adjacent first magnets are connected end to end to form a closed annular structure to form the first weight-reducing hole in the center of the first magnetic group; or, the first magnetic group includes a plurality of first magnets, and adjacent first magnets are spaced to form an annular structure with gaps to form the first weight-reducing hole in the center of the first magnetic group;

[0021] And / or, the inner magnetic group includes an inner magnet, and the inner magnet forms a closed integral annular structure to form the second weight-reducing hole in the center of the inner magnetic group; or, the inner magnetic group includes a plurality of inner magnets, and adjacent inner magnets are connected end to end to form a closed annular structure to form the second weight-reducing hole in the center of the inner magnetic group; or, the inner magnetic group includes a plurality of inner magnets, and adjacent inner magnets are spaced apart to form an annular structure with a gap to form the second weight-reducing hole in the center of the inner magnetic group;

[0022] And / or, the outer magnetic group includes an outer magnet, the outer magnet forms a closed integral ring structure, and is arranged around the inner magnetic group; or, the outer magnetic group includes a plurality of outer magnets, adjacent outer magnets are connected end to end to form a closed ring structure, and are arranged around the inner magnetic group; or, the outer magnetic group includes a plurality of outer magnets, adjacent outer magnets are arranged at intervals to form a ring structure with gaps, and are arranged around the inner magnetic group;

[0023] And / or, the fourth magnetic group includes a fourth magnet with an integral plate-like structure; or, the fourth magnetic group includes a plurality of fourth magnets, the plurality of fourth magnets are adjacent to and laid flat on a side of the third magnetic group facing away from the second magnetic group, the plurality of fourth magnets are magnetized along the vibration direction of the vibration system, and the magnetization directions of the plurality of fourth magnets are the same.

[0024] In one embodiment, the voice coil is in a rectangular ring shape, and the voice coil has a long side and a short side connected end to end;

[0025] The third magnetic group includes two third magnets, the two third magnets are adjacent to each other and arranged in parallel along the direction of the long side, the two third magnets are magnetized along the direction of the long side, and the magnetization directions of the two third magnets are opposite;

[0026] Or, the third magnetic group includes two third magnets, the two third magnets are adjacent to each other and arranged in parallel along the direction of the short side, the two third magnets are magnetized along the direction of the short side, and the magnetization directions of the two third magnets are opposite;

[0027] Or, the third magnetic group includes four third magnets, two of the third magnets are adjacent and arranged in parallel along the direction of the short side, and the other two third magnets are arranged at both ends of the two third magnets along the direction of the long side, and the four third magnets are magnetized along the direction of the short side and the direction of the long side respectively, the magnetization directions of the two third magnets arranged along the short side are opposite, and the magnetization directions of the other two third magnets arranged along the long side are opposite;

[0028] Alternatively, the third magnetic group is divided along two diagonal lines to form four third magnets, two of the third magnets are arranged in parallel along the direction of the short side, and the other two of the third magnets are arranged in parallel along the direction of the long side. The four third magnets are magnetized along the direction of the short side and the direction of the long side, respectively. The magnetization directions of the two third magnets arranged along the short side are opposite, and the magnetization directions of the other two third magnets arranged along the long side are opposite.

[0029] In one embodiment, the magnetization direction of the first magnetic group is the same as that of the outer magnetic group, the magnetization direction of the first magnetic group is opposite to that of the fourth magnetic group, and the magnetization direction of the inner magnetic group is the same as that of the third magnetic group.

[0030] In one embodiment, the magnetization direction of the inner magnetic group is along the direction from the center of the inner magnetic group to the periphery of the inner magnetic group, and the magnetization direction of the third magnetic group is along the direction from the center of the third magnetic group to the periphery of the third magnetic group;

[0031] Alternatively, the inner magnetic group and the third magnetic group both have a first axis and a second axis that are perpendicular to the vibration direction of the vibration system, and the first axis and the second axis are perpendicular to each other, and the magnetization direction of the inner magnetic group and the magnetization direction of the third magnetic group are both along the first axis and / or the second axis.

[0032] In one embodiment, the projection of the voice coil along the vibration direction perpendicular to the vibration system is located within the projection range of the third magnetic group along the vibration direction perpendicular to the vibration system;

[0033] And / or, the thickness of the third magnetic group along the vibration direction of the vibration system is greater than or equal to the sum of the thicknesses of the first magnetic group and the second magnetic group along the vibration direction of the vibration system;

[0034] And / or, along the vibration direction of the vibration system, the first magnetic group and the second magnetic group are both located below an end of the voice coil away from the diaphragm.

[0035] In one embodiment, the projection area of ​​the fourth magnetic group along the vibration direction of the vibration system is smaller than the projection area of ​​the third magnetic group along the vibration direction of the vibration system, the diaphragm is annular, the inner periphery of the diaphragm is fixed to the periphery of the third magnetic group on the side facing away from the second magnetic group, and is arranged around the fourth magnetic group;

[0036] And / or, the top surface of the diaphragm facing away from the magnetic circuit system is not higher than the top surface of the fourth magnetic group facing away from the third magnetic group.

[0037] In one embodiment, an edge of the third magnetic group is provided with an avoidance structure, and the avoidance structure is at least one of an inclined surface, a fillet, a chamfer, and a step structure;

[0038] The avoidance structure is disposed around the periphery of the third magnetic group on the side facing away from the second magnetic group; or, the avoidance structure includes a plurality of avoidance structures, the plurality of avoidance structures are arranged at intervals, and are disposed around the periphery of the third magnetic group on the side facing away from the second magnetic group; or, the avoidance structure includes a plurality of adjacent avoidance structures connected end to end to form a closed ring structure, and are disposed around the periphery of the third magnetic group on the side facing away from the second magnetic group;

[0039] And / or, an angle formed by the avoidance structure and a surface of the third magnetic group facing away from the second magnetic group is greater than 90° and less than 180°.

[0040] In one embodiment, the edge magnetic portion includes a stacked edge magnet and an edge magnetic conductive plate, and the edge magnet is connected to the magnetic conductive yoke;

[0041] Among them, the first magnetic group, the external magnetic group, the fourth magnetic group and the side magnet are all magnetized along the vibration direction of the vibration system, the magnetization direction of the first magnetic group and the magnetization direction of the external magnetic group are opposite to the magnetization direction of the side magnet, and the magnetization direction of the fourth magnetic group is the same as the magnetization direction of the side magnet.

[0042] In one embodiment, the sound-generating device further comprises a housing, one end of which is connected to the edge magnetic plate, and the other end of which is connected to the outer periphery of the diaphragm;

[0043] Wherein, the side magnetic conductive plate and the shell are an integrally formed structure.

[0044] In one embodiment, the vibration system further comprises a frame, the frame comprising a main body and a connecting portion connected to a periphery of the main body, the main body being disposed between the diaphragm and the voice coil;

[0045] The vibration system also includes a centering support plate, which includes an external fixing portion, an internal fixing portion, and an elastic arm portion connecting the external fixing portion and the internal fixing portion, the external fixing portion is connected to the outer shell and / or the edge magnetic portion, and the internal fixing portion is connected to the connecting portion.

[0046] In one embodiment, the diaphragm includes an inner ring portion, a first folded ring arranged around the inner ring portion, a straight portion arranged around the first folded ring, a second folded ring arranged around the straight portion, and a fixed portion connected to the outer side of the second folded ring, the fixed portion is connected to the housing, the straight portion is directly or indirectly connected to the voice coil, and the inner ring portion is connected to the third magnetic group;

[0047] The inner ring portion is formed with an inner ring hole, and the fourth magnetic group is protrudingly arranged on the inner ring hole.

[0048] 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;

[0049] And / or, the first fold ring protrudes in a direction away from the magnetic yoke, and the second fold ring protrudes in a direction close to the magnetic yoke;

[0050] And / or, the diaphragm further comprises a reinforcement portion, and the reinforcement portion is arranged on the straight portion;

[0051] And / or, one end of the fixing portion away from the second fold ring is bent and extended toward the shell to form a bent portion, and the bent portion is connected to the outer wall of the shell.

[0052] The present invention further provides an electronic device, which includes the sound-generating device described above.

[0053] The sound-generating device of the technical solution of the present invention is provided with a magnetic circuit system as a magnetic yoke and a central magnetic part and a side magnetic part provided on the magnetic yoke, so that the side magnetic part is located on the outside of the central magnetic part and is spaced from the central magnetic part to form a magnetic gap, and one end of the voice coil of the vibration system is suspended in the magnetic gap, so that current is passed through the voice coil, so that the voice coil vibrates in the magnetic field formed by the magnetic circuit system and drives the diaphragm to vibrate and produce sound; at the same time, by providing the central magnetic part as a first magnetic group, a second magnetic group, a third magnetic group and a fourth magnetic group stacked on the magnetic yoke, the first magnetic group, the outer magnetic group of the second magnetic group and the fourth magnetic group are all magnetized along the vibration direction of the vibration system, and the inner magnetic group of the second magnetic group and the third magnetic group are all magnetized along the vibration direction perpendicular to the vibration direction of the vibration system, that is, the magnetization directions of the inner magnetic group of the second magnetic group and the third magnetic group are perpendicular to the magnetization directions of the outer magnetic group of the second magnetic group, the first magnetic group and the fourth magnetic group, and the third magnetic group is close to the magnetic gap. The magnetic poles on the side of the inner magnetic group are the same as the magnetic poles on the side of the inner magnetic group close to the outer magnetic group, the magnetic poles on the side of the first magnetic group close to the second magnetic group are the same as the magnetic poles on the side of the outer magnetic group close to the third magnetic group, the magnetic poles on the side of the fourth magnetic group close to the third magnetic group, and the magnetic poles on the side of the third magnetic group close to the magnetic gap, so that the central magnetic part forms a Halbach magnetic circuit. The Halbach magnetic circuit formed by the central magnetic part can effectively improve the magnetic field strength, increase the density of the magnetic flux in the magnetic gap, make the magnetic flux lines effectively gather in the magnetic gap, increase the number of magnetic force lines passing through the voice coil, thereby increasing the magnetic field force on the voice coil, effectively improving the BL value, and improving the sensitivity of the sound-generating device. In this way, the flatness of the BL curve is improved, the FR frequency response curve is significantly improved, and the harmonic distortion THD is effectively reduced, so that the sound effect and performance of the whole machine are better improved; further, by providing a weight reduction space in the central magnetic part, the weight of the sound-generating device can be reduced without losing the magnetic field strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0055] Figure 1 A schematic structural diagram of an embodiment of a sound-generating device provided by the present invention;

[0056] Figure 2 A schematic structural diagram of another perspective of an embodiment of a sound-generating device provided by the present invention;

[0057] Figure 3 An exploded schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0058] Figure 4 A cross-sectional schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0059] Figure 5 A partial cross-sectional schematic diagram of an embodiment of a magnetic circuit system provided by the present invention;

[0060] Figure 6 A schematic structural diagram of an embodiment of a magnetically conductive yoke provided by the present invention;

[0061] Figure 7 A schematic structural diagram of an embodiment of a first magnetic group provided by the present invention;

[0062] Figure 8 A schematic structural diagram of an embodiment of a second magnetic group provided by the present invention;

[0063] Fig. 9 This is a schematic structural diagram of an embodiment of a third magnetic group provided by the present invention.

[0064] Description of Figure Numbers:

[0065] 100. Sounding device; 1. Shell; 2. Magnetic circuit system; 21. Magnetic yoke; 211. Third weight-reducing hole; 212. Magnetic column; 22. Central magnetic part; 221. First magnetic group; 2211. First magnet; 2212. First weight-reducing hole; 222. Second magnetic group; 2221. Inner magnetic group; 2222. Inner magnet; 2223. Outer magnetic group; 2224. Outer magnet; 2225. Second weight-reducing hole; 223. Third magnetic group; 2231. Third magnet; 2232. Avoidance structure; 224. Fourth magnetic group; 2241. Four magnets; 225, weight-reducing space; 23, side magnet portion; 231, side magnet; 232, side magnetic plate; 24, magnetic gap; 3, vibration system; 31, diaphragm; 311, inner ring portion; 312, inner ring hole; 313, first folding ring; 314, straight portion; 315, second folding ring; 316, fixing portion; 317, bending portion; 318, reinforcement portion; 32, voice coil; 33, skeleton; 331, main body; 332, connecting portion; 34, centering support plate; 341, external fixing portion; 342, internal fixing portion; 343, elastic arm portion.

[0066] 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

[0067] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0068] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0069] 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 a option in which both A and B are satisfied.

[0070] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0071] In recent years, convenient electronic devices (such as mobile phones, headphones, and computers) have become part of people's daily lives. With the rapid development of technology, people's demands for the sound quality and sensitivity of speakers in electronic devices are getting higher and higher, and full-range and miniaturized speakers have become mainstream demands.

[0072] At present, the box space in electronic devices is getting smaller and smaller, and the BL value of the sound-generating device is limited by the space size, resulting in a small number of magnetic lines passing through the voice coil in the speaker, which leads to a smaller magnetic field force on the voice coil, making the sound-generating device low in sensitivity and poor in overall acoustic performance and sound effects.

[0073] Based on the above concepts and problems, the present invention proposes a sound device 100. It is understandable that the sound device 100 can be applied to electronic devices, and the electronic devices can be headphones, mobile phones, MP3, MP4, computers, tablet computers, smart wearable devices, etc., which are not limited here.

[0074] Please refer to Figures 1 to 9As shown, in the embodiment of the present invention, the sound-generating device 100 includes a magnetic circuit system 2 and a vibration system 3, the magnetic circuit system 2 includes a magnetic yoke 21 and a central magnetic portion 22 and a side magnetic portion 23 arranged on the magnetic yoke 21, the side 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 magnetic gap 24, the central magnetic portion 22 includes a first magnetic group 221, a second magnetic group 222, a third magnetic group 223 and a fourth magnetic group 224 sequentially stacked on the magnetic yoke 21, the second magnetic group 222 includes an inner magnetic group 2221 and an outer magnetic group 2223 flatly arranged between the first magnetic group 221 and the third magnetic group 223, the outer magnetic group 2223 is arranged around the inner magnetic group 2221, the vibration system 3 includes a diaphragm 31 and a voice coil 32 connected to the diaphragm 31, and one end of the voice coil 32 is suspended in the magnetic gap 24; wherein The first magnetic group 221, the outer magnetic group 2223 and the fourth magnetic group 224 are all magnetized along the vibration direction of the vibration system 3, the inner magnetic group 2221 and the third magnetic group 223 are all magnetized along the vibration direction perpendicular to the vibration system 3, the magnetic pole of the first magnetic group 221 close to the second magnetic group 222 is the same as the magnetic pole of the outer magnetic group 2223 close to the third magnetic group 223, the magnetic pole of the first magnetic group 221 close to the second magnetic group 222 is the same as the magnetic pole of the fourth magnetic group 224 close to the third magnetic group 223, the magnetic pole of the third magnetic group 223 close to the magnetic gap 24 is the same as the magnetic pole of the inner magnetic group 2221 close to the outer magnetic group 2223, the magnetic pole of the first magnetic group 221 close to the second magnetic group 222 is the same as the magnetic pole of the third magnetic group 223 close to the magnetic gap 24, and the central magnetic portion 22 is provided with a weight reduction space 225.

[0075] In this embodiment, the sound-generating device 100 may be a sound-generating unit of a speaker, and the speaker may be a micro speaker. Of course, the sound-generating device 100 may also be a speaker module, that is, a sound-generating module structure, which is not limited here.

[0076] It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 are arranged relative to each other. Of course, in other embodiments, in order to further reduce the Z-direction size of the electronic device, the Z-direction height of the sound-generating device 100 itself can be used to increase the Z-direction height of the magnetic circuit system 2 of the sound-generating device 100, that is, a through structure for the magnetic circuit system 2 to protrude is provided in the center of the vibration system 3, and at least part of the magnetic circuit system 2 protrudes from the through structure in the center of the vibration system 3, and the center of the vibration system 3 is connected and fixed to the magnetic circuit system 2, which is not limited here.

[0077] Optionally, the magnetic circuit system 2 may be arranged in a square shape. For example, the magnetic circuit system 2 may include a central magnetic portion 22 and a side magnetic portion 23, both of which are square structures. The vibration system 3 may optionally be arranged in a square shape. It is understandable that the periphery of the diaphragm 31 of the vibration system 3 may be connected to the magnetic circuit system 2, or the magnetic circuit system 2 and the vibration system 3 may be respectively assembled on a housing or a module housing, etc., which is not limited here.

[0078] In order to better assemble the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100. In one embodiment, as Figures 2 to 4 As shown, the sound-generating device 100 further includes a housing 1 , a magnetic circuit system 2 connected to one end of the housing 1 , and a vibration system 3 connected to the other end of the housing 1 , that is, the periphery of a diaphragm 31 of the vibration system 3 is connected to the other end of the housing 1 .

[0079] In this embodiment, the housing 1 is used to install, fix and support components such as the magnetic circuit system 2 and the vibration system 3, that is, the housing 1 provides an installation base for components such as the magnetic circuit system 2 and the vibration system 3. It can be understood that the housing 1 can be an integral structure or a plurality of split structures, which is not limited here. The housing 1 in this embodiment can be selected as a square frame or frame structure, that is, the housing 1 has a cavity with openings at both ends, and the magnetic circuit system 2 and the vibration system 3 are respectively connected to the two sides of the housing 1, so that the magnetic circuit system 2, the housing 1 and the diaphragm 31 of the vibration system 3 enclose a vibration cavity.

[0080] In this embodiment, the housing 1 is used to accommodate and fix the vibration system 3 and the magnetic circuit system 2 and other structures, so that the sound device 100 can be used as an independent component in an electronic device or a sound module, which is not limited here. Of course, in other embodiments, the sound device 100 can also be a module structure, in which case the vibration system 3 and the magnetic circuit system 2 and other structures of the sound unit are installed as multiple independent components on the housing 1 of the module structure, which is not limited here.

[0081] It can be understood that by setting the magnetic circuit system 2 as a magnetic yoke 21 and a central magnetic part 22 and a side magnetic part 23 provided on the magnetic yoke 21, the magnetic circuit system 2 can be connected to the housing 1 through the periphery of the magnetic yoke 21; or, the magnetic circuit system 2 can be connected to the housing 1 through the side magnetic part 23, which is not limited here. In this embodiment, the side magnetic part 23 is located outside the central magnetic part 22, and is enclosed with the central magnetic part 22 to form a magnetic gap 24, so that the diaphragm 31 of the vibration system 3 is connected to the end of the housing 1 away from the magnetic yoke 21, and is opposite to the magnetic circuit system 2 and spaced or the center of the diaphragm 31 is connected to the central magnetic part 22 of the magnetic circuit system 2, etc., so that one end of the voice coil 32 is connected to the diaphragm 31, and the other end of the voice coil 32 is set corresponding to the magnetic gap 24.

[0082] In this embodiment, the voice coil 32 may be in the shape of an annular cylinder, in which case one end of the voice coil 32 is connected to the diaphragm 31, and the other end of the voice coil 32 is suspended in the magnetic gap 24. Of course, in other embodiments, the voice coil 32 may be a flat voice coil, in which case it is fixed to the side of the diaphragm 31 facing the magnetic circuit system 2, and is arranged opposite to and spaced from the magnetic gap 24 of the magnetic circuit system 2, that is, the other end of the voice coil 32 is located outside the magnetic gap 24, and along the vibration direction of the vibration system 3, the other end of the voice coil 32 is arranged opposite to the magnetic gap 24, which is not limited here.

[0083] In order to realize the electrical connection between the voice coil 32 and the external circuit. Figures 2 to 4 As shown, the vibration system 3 further includes a centering support plate 34 , one end of which is connected to the voice coil 32 and is connected and conducted with the lead wire of the voice coil 32 , and the other end of the centering support plate 34 is connected to the housing 1 .

[0084] It can be understood that the two ends of the centering support 34 are electrically connected to the lead wires of the voice coil 32 and the external circuit respectively. In this embodiment, the centering support 34 can be arranged at the bottom of the voice coil 32, and the centering support 34 is located at the four corners of the sound-generating device 100 or in the short axis or long axis direction of the sound-generating device 100. Of course, the centering support 34 can also be arranged at the top of the voice coil 32, and the centering support 34 is located between the voice coil 32 and the diaphragm 31, which is not limited here.

[0085] In this embodiment, by arranging the central magnetic portion 22 as a first magnetic group 221, a second magnetic group 222, a third magnetic group 223 and a fourth magnetic group 224 stacked on the magnetic yoke 21, the first magnetic group 221 of the central magnetic portion 22, the outer magnetic group 2223 of the second magnetic group 222 and the fourth magnetic group 224 are all magnetized along the vibration direction of the vibration system 3, and the inner magnetic group 2221 of the second magnetic group 222 and the third magnetic group 223 are all magnetized along the vibration direction perpendicular to the vibration direction of the vibration system 3, that is, the magnetization directions of the inner magnetic group 2221 and the third magnetic group 223 of the second magnetic group 222 are all perpendicular to the vibration direction of the vibration system 3. 223. The magnetizing directions of the first magnetic group 221 and the fourth magnetic group 224 are arranged vertically so that the central magnetic part 22 forms a Halbach magnetic circuit, thereby forming a magnetic field with a higher magnetic field strength, which can increase the density of the magnetic flux of the magnetic gap 24, so that the magnetic flux lines are effectively gathered in the magnetic gap 24, thereby increasing the number of magnetic force lines passing through the voice coil 32, increasing the magnetic field force on the voice coil 32, effectively improving the BL value, and improving the sensitivity of the sound-generating device 100, thereby improving the flatness of the BL curve, significantly improving the FR frequency response curve, and effectively reducing the harmonic distortion THD, so that the sound effect and performance of the whole machine are better improved.

[0086] Optionally, the vibration direction of the vibration system 3 in this embodiment is a vertical direction. In this embodiment, the central magnetic portion 22 is configured as a first magnetic group 221, a second magnetic group 222, a third magnetic group 223 and a fourth magnetic group 224 stacked on the magnetic yoke 21, that is, the first magnetic group 221, the second magnetic group 222, the third magnetic group 223 and the fourth magnetic group 224 are stacked on the magnetic yoke 21 along the vertical direction.

[0087] In this embodiment, the first magnetic group 221 of the central magnetic portion 22, the outer magnetic group 2223 of the second magnetic group 222, and the fourth magnetic group 224 are all magnetized in the vertical direction, and the inner magnetic group 2221 of the second magnetic group 222 and the third magnetic group 223 are all magnetized in the horizontal direction. It can be understood that the magnetization directions of the inner magnetic group 2221 of the second magnetic group 222 and the third magnetic group 223 are perpendicular to the magnetization directions of the outer magnetic group 2223 of the second magnetic group 222, the first magnetic group 221, and the fourth magnetic group 224. It should be noted that Figure 5 , Figure 8 and Fig. 9 The direction of the arrow in the middle magnetic circuit system 2 is the direction from the S pole to the N pole, that is, the magnetization direction.

[0088] It can be understood that the central magnetic part 22 forms a Halbach magnetic array, which can generate a strong magnetic field. The magnetic field generated by the Halbach magnetic array drives the voice coil 32 to drive the diaphragm 31 to vibrate and produce sound, so that there is a strong magnetic field at the voice coil 32, which is conducive to improving the sensitivity of controlling the vibration of the diaphragm 31; and the Halbach magnetic array allows the magnetic flux lines at the voice coil 32 to be evenly distributed and the magnetic field change in the vibration direction of the diaphragm 31 has good linearity, which can effectively improve the sound quality of the audio output by the sound device 100, enhance the treble effect, and alleviate the distortion of the audio output by the sound device 100 to a certain extent. Among them, the vibration of the diaphragm 31 is specifically that the edge of the diaphragm 31 is fixed, and the surface of the diaphragm 31 reciprocates in a direction perpendicular to the surface of the diaphragm 31.

[0089] In this embodiment, the first magnetic group 221, the second magnetic group 222, the third magnetic group 223 and the fourth magnetic group 224 of the central magnetic portion 22 are optionally stacked along the moving direction of the voice coil 32, that is, the first magnetic group 221 is connected to the magnetic yoke 21, the second magnetic group 222 is stacked on the side of the first magnetic group 221 facing away from the magnetic yoke 21, the third magnetic group 223 is stacked on the side of the second magnetic group 222 facing away from the first magnetic group 221, and the fourth magnetic group 224 is stacked on the side of the third magnetic group 223 facing away from the second magnetic group 222.

[0090] Optionally, the first magnetic group 221 , the second magnetic group 222 , the third magnetic group 223 and the fourth magnetic group 224 of the central magnetic portion 22 are in a square plate-shaped structure, which is not limited here.

[0091] In this embodiment, if Figures 3 to 5 , Figures 7 to 9 As shown, the first magnetic group 221 of the central magnetic part 22, the outer magnetic group 2223 of the second magnetic group 222 and the fourth magnetic group 224 are magnetized in the vertical direction, and the inner magnetic group 2221 and the third magnetic group 223 of the second magnetic group 222 are magnetized in the horizontal direction, that is, the magnetization directions of the inner magnetic group 2221 and the third magnetic group 223 of the second magnetic group 222 are perpendicular to the magnetization directions of the outer magnetic group 2223 of the second magnetic group 222, the first magnetic group 221 and the fourth magnetic group 224, so that the first magnetic group 221, the second magnetic group 222, the third magnetic group 223 and the fourth magnetic group 224 of the central magnetic part 22 are used to form a Halbach magnetic array, forming a magnetic field with a higher magnetic field strength, thereby increasing the density of the magnetic flux of the magnetic gap 24, increasing the number of magnetic lines of force passing through the voice coil 32, increasing the magnetic field force on the voice coil 32, effectively improving the BL value, improving the sensitivity of the sound-generating device 100, and improving the sound effect and performance of the whole machine.

[0092] In one embodiment, the magnetizing direction of the first magnetic group 221 is the same as that of the outer magnetic group 2223 , the magnetizing direction of the first magnetic group 221 is opposite to that of the fourth magnetic group 224 , and the magnetizing direction of the inner magnetic group 2221 is the same as that of the third magnetic group 223 .

[0093] Optionally, the magnetic pole of the first magnetic group 221 close to the second magnetic group 222 is the same as the magnetic pole of the outer magnetic group 2223 close to the third magnetic group 223, the magnetic pole of the first magnetic group 221 close to the second magnetic group 222 is the same as the magnetic pole of the fourth magnetic group 224 close to the third magnetic group 223, the magnetic pole of the third magnetic group 223 close to the magnetic gap 24 is the same as the magnetic pole of the inner magnetic group 2221 close to the outer magnetic group 2223, and the magnetic pole of the first magnetic group 221 close to the second magnetic group 222 is the same as the magnetic pole of the third magnetic group 223 close to the magnetic gap 24.

[0094] In this embodiment, the third magnetic group 223 and the inner magnetic group 2221 of the second magnetic group 222 are magnetized in the horizontal direction, so that the magnetic induction direction is radially outward, and forms a magnetic field loop with the edge magnetic portion 23; the first magnetic group 221, the outer magnetic group 2223 of the second magnetic group 222 and the fourth magnetic group 224 are magnetized in the vertical direction, and the magnetization direction of the outer magnetic group 2223 of the first magnetic group 221 and the second magnetic group 222 is opposite to the magnetization direction of the fourth magnetic group 224, so that the first magnetic group 221 and the edge magnetic portion 23 form a magnetic field loop. , and the magnetic flux lines are gathered and transferred to the second magnetic group 222, reducing the discreteness of the magnetic field and increasing the magnetic field. At the same time, the magnetic flux lines of the first magnetic group 221, the outer magnetic group 2223 of the second magnetic group 222 and the fourth magnetic group 224 are gathered in the third magnetic group 223, which can reduce the discreteness of the magnetic field and increase the magnetic field. The magnetic field with a strong magnetic field strength generated by the central magnetic part 22 passes through the magnetic gap 24, thereby increasing the density of the magnetic flux of the magnetic gap 24, increasing the number of magnetic flux lines passing through the voice coil 32, increasing the magnetic field force on the voice coil 32, and effectively improving the BL value.

[0095] It can be understood that the structural design of the central magnetic part 22 in the present application can effectively gather the magnetic induction to the magnetic gap 24 near the voice coil 32, thereby enhancing the magnetic field strength. Compared with the magnetic circuit system in a conventional speaker, the magnetic field strength of the sound-generating device 100 of the present application can be increased by about 34%. It should be noted that the magnetic circuit system 2 of the sound-generating device 100 in the present application is designed to be a Halbach magnetic field enhancement idea, and the central magnetic part 22 is layered, which can effectively reduce the magnetic field dispersion, increase the magnetic field strength at the magnetic gap 24, and the magnets in each layer are designed separately, which can more effectively increase the magnet utilization rate.

[0096] In this embodiment, a weight reduction space 225 is provided in the central magnetic part 22, that is, a hole is dug in part of the central magnetic part 22, so that the weight of the central magnetic part 22 can be reduced without losing the magnetic field strength, thereby reducing the weight of the sound-generating device 100.

[0097] In this embodiment, the weight reduction space 225 can be a through hole, a through cavity, a recessed structure or a groove structure, etc., which is not limited here. It can be understood that the weight reduction space 225 can be provided in the first magnetic group 221 and / or the second magnetic group 222 and / or the third magnetic group 223 and / or the fourth magnetic group 224 of the central magnetic part 22, that is, the weight reduction space 225 can be provided in any one or more layers of the first magnetic group 221, the second magnetic group 222, the third magnetic group 223 and the fourth magnetic group 224 in the central magnetic part 22, which is not limited here.

[0098] Optionally, a weight-reducing space 225 is provided in the center of the first magnetic group 221. In this embodiment, the weight-reducing space 225 can be a through hole or a groove. For example, the weight-reducing space 225 is a through hole that passes through the center of the first magnetic group 221; or, the weight-reducing space 225 is a groove provided on the side of the first magnetic group 221 facing the magnetic guide yoke 21; or, the weight-reducing space 225 is a groove provided on the side of the first magnetic group 221 facing the second magnetic group 222, which is not limited here.

[0099] Optionally, a weight-reducing space 225 is provided in the center of the second magnetic group 222. In this embodiment, the weight-reducing space 225 can be a through hole or a groove. For example, the weight-reducing space 225 is a through hole that runs through the center of the second magnetic group 222; or, the weight-reducing space 225 is a groove provided on the side of the second magnetic group 222 facing the first magnetic group 221; or, the weight-reducing space 225 is a groove provided on the side of the second magnetic group 222 facing the third magnetic group 223, which is not limited here.

[0100] Optionally, a weight-reducing space 225 is provided in the center of the third magnetic group 223. In the present embodiment, the weight-reducing space 225 may be a through hole or a groove. For example, the weight-reducing space 225 is a through hole that passes through the center of the third magnetic group 223; or, the weight-reducing space 225 is a groove provided on the side of the third magnetic group 223 facing the second magnetic group 222; or, the weight-reducing space 225 is a groove provided on the side of the third magnetic group 223 facing the fourth magnetic group 224, which is not limited here.

[0101] Optionally, a weight-reducing space 225 is provided in the center of the fourth magnetic group 224. In the present embodiment, the weight-reducing space 225 may be a through hole or a groove. For example, the weight-reducing space 225 is a through hole that passes through the center of the fourth magnetic group 224; or, the weight-reducing space 225 is a groove provided on the side of the fourth magnetic group 224 facing the third magnetic group 223; or, the weight-reducing space 225 is a groove provided on the side of the fourth magnetic group 224 facing away from the third magnetic group 223, which is not limited here.

[0102] It should be noted that when the weight reduction space 225 is respectively arranged on the first magnetic group 221, the second magnetic group 222, the third magnetic group 223 and the fourth magnetic group 224 of the central magnetic portion 22, the weight reduction space 225 on the first magnetic group 221, the second magnetic group 222, the third magnetic group 223 and the fourth magnetic group 224 is arranged correspondingly or not correspondingly along the vibration direction of the vibration system 3, which is not limited here.

[0103] In one embodiment, the first magnetic group 221 is provided with a first weight reduction hole 2212, the inner magnetic group 2221 is provided with a second weight reduction hole 2225, the first weight reduction hole 2212 is connected to the second weight reduction hole 2225 and cooperates to form a weight reduction space 225; the magnetic yoke 21 is provided with a third weight reduction hole 211 corresponding to the first weight reduction hole 2212, and the third weight reduction hole 211 is connected to the weight reduction space 225.

[0104] In this embodiment, if Figures 2 to 8 As shown, the weight-reducing space 225 sequentially penetrates the first magnetic group 221 and the second magnetic group 222 of the central magnetic part 22, that is, the first weight-reducing hole 2212 of the first magnetic group 221 is correspondingly connected to the second weight-reducing hole 2225 of the inner magnetic group 2221 of the second magnetic group 222. Optionally, the first weight-reducing hole 2212 is located at the center of the first magnetic group 221 and is arranged through the first magnetic group 221, and the second weight-reducing hole 2225 is located at the center of the inner magnetic group 2221 of the second magnetic group 222 and is arranged through the inner magnetic group 2221.

[0105] It can be understood that in order to further reduce the weight of the central magnetic part 22, the magnetic yoke 21 is provided with a third weight-reducing hole 211. Optionally, the third weight-reducing hole 211 is provided corresponding to the weight-reducing space 225. In this embodiment, the weight-reducing space 225 is a through hole or a through cavity structure that passes through the first magnetic group 221 and the second magnetic group 222 of the central magnetic part 22, and the third weight-reducing hole 211 is connected to the weight-reducing space 225 accordingly.

[0106] In order to further increase the magnetic field strength of the central magnetic portion 22 and gather the magnetic flux lines of the first magnetic group 221 and the second magnetic group 222 to the third magnetic group 223, in one embodiment, as shown in FIG. Figures 3 to 6 As shown, the magnetic yoke 21 is provided with a magnetic column 212 located in the weight-reducing space 225 .

[0107] Optionally, one end of the magnetic pillar 212 away from the magnetic yoke 21 abuts against the third magnetic group 223. It can be understood that such a configuration can improve the installation stability of the third magnetic group 223.

[0108] Optionally, the magnetic conductive column 212 is an integral cylindrical structure, and the magnetic conductive column 212 of the cylindrical structure is arranged around the third weight reduction hole 211, and abuts against the first magnetic group 221 and the inner magnetic group 2221. Of course, in other embodiments, the magnetic conductive column 212 includes multiple magnetic conductive columns 212, and the multiple magnetic conductive columns 212 are arranged around the third weight reduction hole 211, and abut against the first magnetic group 221 and the inner magnetic group 2221 respectively.

[0109] Optionally, the weight-reducing space 225 includes a plurality of weight-reducing spaces 225 , and the plurality of weight-reducing spaces 225 are spaced apart from each other in the central magnetic portion 22 .

[0110] In one embodiment, the first magnetic group 221 is provided with a plurality of first weight reduction holes 2212 , and the inner magnetic group 2221 is provided with a plurality of second weight reduction holes 2225 . The plurality of first weight reduction holes 2212 and the plurality of second weight reduction holes 2225 are arranged in one-to-one correspondence to form a plurality of weight reduction spaces 225 .

[0111] In this embodiment, multiple weight reduction spaces 225 are arranged at intervals, and each weight reduction space 225 sequentially penetrates the first magnetic group 221 and the inner magnetic group 2221 of the second magnetic group 222, so that a first weight reduction hole 2212 is formed on the first magnetic group 221, and a second weight reduction hole 2225 is formed on the inner magnetic group 2221.

[0112] Optionally, the magnetic yoke 21 is provided with a third weight-reducing hole 211 corresponding to each weight-reducing space 225. In this embodiment, the magnetic yoke 21 is provided with a magnetic column 212 corresponding to each third weight-reducing hole 211, and the magnetic column 212 can be a cylindrical structure, and the magnetic column 212 of the cylindrical structure is arranged around the third weight-reducing hole 211, which is not limited here.

[0113] In one embodiment, the first magnetic group 221 includes a first magnet 2211 , and the first magnet 2211 forms a closed integral ring structure to form a first weight-reducing hole 2212 in the center of the first magnetic group 221 .

[0114] In this embodiment, the first magnetic group 221 includes a first magnet 2211 of an integral plate-shaped structure, and a first weight-reducing hole 2212 is provided in the center of the first magnet 2211, so that the first magnet 2211 forms a closed integral ring structure. It can be understood that by setting the first magnet 2211 as an integral plate-shaped ring structure, it is convenient for processing the first magnet 2211, and it is also convenient for assembly and magnetization, which effectively improves production and assembly efficiency.

[0115] Optionally, the first magnet 2211 is disposed around the magnetic column 212 of the magnetic yoke 21 .

[0116] In one embodiment, the first magnetic group 221 includes a plurality of first magnets 2211 , and adjacent first magnets 2211 are connected end to end to form a closed ring structure, so as to form a first weight-reducing hole 2212 in the center of the first magnetic group 221 .

[0117] In this embodiment, if Figures 3 to 5 , Figure 7 As shown, a plurality of first magnets 2211 are adjacent and laid flat between the second magnetic group 222 and the magnetic yoke 21, and are arranged around the magnetic column 212. That is, a plurality of first magnets 2211 are connected end to end to form a closed annular structure, so that a first weight reduction hole 2212 is formed in the center of the first magnetic group 221.

[0118] Optionally, the multiple first magnets 2211 are all magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple first magnets 2211 are the same. That is, the multiple first magnets 2211 are all magnetized along the direction of movement of the voice coil 32, and the multiple first magnets 2211 are magnetized upward or downward at the same time, which is not limited here. Optionally, the magnetic poles of the multiple first magnets 2211 close to the second magnetic group 222 are the same.

[0119] In another embodiment, the first magnetic group 221 includes a plurality of first magnets 2211 , and adjacent first magnets 2211 are spaced apart to form an annular structure with gaps, so as to form a first weight-reducing hole 2212 in the center of the first magnetic group 221 .

[0120] In this embodiment, the plurality of first magnets 2211 are arranged at intervals and laid flat between the second magnetic group 222 and the magnetic yoke 21, and are arranged around the magnetic column 212. That is, the adjacent first magnets 2211 in the plurality of first magnets 2211 are spaced to form gaps, so that the plurality of first magnets 2211 form a ring structure with gaps, so that the first weight reduction hole 2212 is formed in the center of the first magnetic group 221.

[0121] Optionally, the multiple first magnets 2211 are all magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple first magnets 2211 are the same. That is, the multiple first magnets 2211 are all magnetized along the direction of movement of the voice coil 32, and the multiple first magnets 2211 are magnetized upward or downward at the same time, which is not limited here. Optionally, the magnetic poles of the multiple first magnets 2211 close to the second magnetic group 222 are the same.

[0122] In the present embodiment, the voice coil 32 is in a rectangular ring shape, and the voice coil 32 has a long side and a short side connected end to end. Optionally, the first magnetic group 221 includes two first magnets 2211, and the two first magnets 2211 are respectively arranged corresponding to the two long sides; or, the first magnetic group 221 includes two first magnets 2211, and the two first magnets 2211 are respectively arranged corresponding to the two short sides; or, the first magnetic group 221 includes four first magnets 2211, and two of the four first magnets 2211 are respectively arranged corresponding to the two long sides, and the other two first magnets 2211 are respectively arranged corresponding to the two short sides, which is not limited here.

[0123] In one embodiment, the inner magnetic group 2221 includes an inner magnet 2222 , and the inner magnet 2222 forms a closed integral annular structure to form a second weight-reducing hole 2225 in the center of the inner magnetic group 2221 .

[0124] In this embodiment, the inner magnetic group 2221 of the second magnetic group 222 includes an inner magnet 2222 of an integral plate-like structure, and a second weight-reducing hole 2225 is opened at the center of the inner magnet 2222 of the plate-like structure, that is, the inner magnet 2222 is an integral plate-like annular structure. It can be understood that such a configuration is convenient for processing the inner magnet 2222, as well as for assembly and magnetization, and effectively improves production and assembly efficiency.

[0125] Optionally, the magnetic pole of the inner magnet 2222 on the inner side close to the center thereof is opposite to the magnetic pole of the first magnetic group 221 on the side close to the second magnetic group 222 .

[0126] In one embodiment, the inner magnetic group 2221 includes a plurality of inner magnets 2222 , and adjacent inner magnets 2222 are connected end to end to form a closed annular structure, so as to form a second weight-reducing hole 2225 in the center of the inner magnetic group 2221 .

[0127] In this embodiment, if Figures 3 to 5 , Figure 8 As shown, the multiple inner magnets 2222 are connected end to end to form a closed ring structure, so that a second weight reduction hole 2225 is formed in the center of the inner magnetic group 2221. The multiple inner magnets 2222 are located between the first magnetic group 221 and the third magnetic group 223, and are located inside the outer magnetic group 2223.

[0128] Optionally, the multiple inner magnets 2222 are magnetized in a direction perpendicular to the vibration direction of the vibration system 3. It can be understood that the multiple inner magnets 2222 are magnetized in a horizontal direction, that is, the multiple inner magnets 2222 are magnetized in a direction perpendicular to the movement of the voice coil 32, and the multiple inner magnets 2222 are magnetized from the periphery to the center, or from the center to the periphery, which is not limited here.

[0129] In this embodiment, a plurality of inner magnets 2222 are arranged around the magnetic column 212 of the magnetic yoke 21. Optionally, the magnetic poles of the plurality of inner magnets 2222 facing the outer magnetic group 2223 are the same, that is, the polarities of the plurality of inner magnets 2222 facing the outer magnetic group 2223 are all N poles or all S poles, which is not limited here.

[0130] In another embodiment, the inner magnetic group 2221 includes a plurality of inner magnets 2222 , and adjacent inner magnets 2222 are spaced apart to form an annular structure with gaps, so as to form a second weight-reducing hole 2225 in the center of the inner magnetic group 2221 .

[0131] In this embodiment, multiple inner magnets 2222 are arranged at intervals and around the magnetic column 212 of the magnetic yoke 21, and gaps are formed between adjacent inner magnets 2222, so that the multiple inner magnets 2222 form a ring structure with gaps, that is, a second weight reduction hole 2225 is formed in the center of the inner magnetic group 2221.

[0132] Optionally, the multiple inner magnets 2222 are magnetized in a direction perpendicular to the vibration direction of the vibration system 3. That is, the multiple inner magnets 2222 are magnetized in a horizontal direction. In this embodiment, the magnetic poles of the multiple inner magnets 2222 facing the outer magnetic group 2223 are the same, that is, the polarities of the multiple inner magnets 2222 facing the outer magnetic group 2223 are all N poles or all S poles, which is not limited here.

[0133] In this embodiment, the second weight-reducing hole 2225 may be selected as a rectangular hole, and the second weight-reducing hole 2225 has two long sides and two short sides. Optionally, the internal magnetic group 2221 includes two internal magnets 2222, and the two internal magnets 2222 are respectively arranged corresponding to the two long sides, and the magnetization directions of the two internal magnets 2222 are opposite; or, the internal magnetic group 2221 includes two internal magnets 2222, and the two internal magnets 2222 are respectively arranged corresponding to the two short sides, and the magnetization directions of the two internal magnets 2222 are opposite; or, the internal magnetic group 2221 includes four internal magnets 2222, and two of the four internal magnets 2222 are respectively arranged corresponding to the two long sides, and the magnetization directions of the two internal magnets 2222 are opposite, and the other two internal magnets 2222 are respectively arranged corresponding to the two short sides, and the magnetization directions of the two internal magnets 2222 are opposite, which is not limited here.

[0134] In one embodiment, the outer magnetic group 2223 includes an outer magnet 2224, and the outer magnet 2224 forms a closed integral ring structure and is disposed around the inner magnetic group 2221. It can be understood that the outer magnetic group 2223 can be selected as an annular outer magnet 2224, that is, the outer magnet 2224 forms a closed integral ring structure and is disposed around the inner magnetic group 2221.

[0135] In one embodiment, the outer magnetic group 2223 includes a plurality of outer magnets 2224, and the adjacent outer magnets 2224 are connected end to end to form a closed ring structure and are arranged around the inner magnetic group 2221. It can be understood that the plurality of outer magnets 2224 are connected end to end to form a closed ring structure and are arranged around the inner magnetic group 2221, that is, the adjacent outer magnets 2224 are mutually abutted and connected.

[0136] In another embodiment, the outer magnetic group 2223 includes a plurality of outer magnets 2224, and the adjacent outer magnets 2224 are spaced apart to form a ring structure with a gap, and are arranged around the inner magnetic group 2221. It can be understood that the plurality of outer magnets 2224 are spaced apart from each other and arranged around the inner magnetic group 2221, and the adjacent outer magnets 2224 are spaced apart to form a ring structure with a gap, which is not limited here.

[0137] In the present embodiment, the voice coil 32 is in the shape of a rectangular ring, and the voice coil 32 has a long side and a short side connected end to end. Optionally, the long side or short side of the voice coil 32 corresponds to an external magnet 2224 or multiple external magnets 2224, respectively, which is not limited here. The multiple external magnets 2224 are all magnetized in the vertical direction, and the magnetization directions of the multiple external magnets 2224 are the same. That is, the multiple external magnets 2224 are all magnetized in the direction of movement of the voice coil 32, and the multiple external magnets 2224 are magnetized upward or downward at the same time, which is not limited here. Optionally, the magnetic poles of the multiple external magnets 2224 close to the side of the third magnetic group 223 are the same.

[0138] In one embodiment, the fourth magnetic group 224 includes a fourth magnet 2241 having an integral plate-like structure. Figures 3 to 5 As shown, by configuring the fourth magnet 2241 as an integral plate-shaped structure, it is convenient for processing, assembling and magnetizing the fourth magnet 2241, thereby effectively improving production and assembly efficiency.

[0139] In one embodiment, the fourth magnetic group 224 includes a plurality of fourth magnets 2241, and the plurality of fourth magnets 2241 are adjacent to and laid flat on a side of the third magnetic group 223 facing away from the second magnetic group 222, and the plurality of fourth magnets 2241 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the plurality of fourth magnets 2241 are the same.

[0140] In this embodiment, the fourth magnetic group 224 is configured as a plurality of fourth magnets 2241, and the plurality of fourth magnets 2241 are laid flat on the side of the third magnetic group 223 facing away from the second magnetic group 222. Optionally, the plurality of fourth magnets 2241 are magnetized in the vertical direction, and the magnetization directions of the plurality of fourth magnets 2241 are the same. That is, the plurality of fourth magnets 2241 are magnetized in the direction in which the voice coil 32 moves, and the plurality of fourth magnets 2241 are magnetized upward or downward at the same time, which is not limited here. Optionally, the magnetic poles of the plurality of fourth magnets 2241 close to the side of the third magnetic group 223 are the same.

[0141] It can be understood that the fourth magnetic group 224 can be an integral fourth magnet 2241 of a square plate-like structure, which is arranged on the side of the third magnetic group 223 facing away from the second magnetic group 222; or, the fourth magnetic group 224 includes a plurality of fourth magnets 2241, and the plurality of fourth magnets 2241 are adjacently and parallelly arranged on the side of the third magnetic group 223 facing away from the second magnetic group 222, so that the plurality of fourth magnets 2241 cooperate to form a square plate-like structure, which is not limited here.

[0142] In this embodiment, the voice coil 32 is in a rectangular ring shape, and has a long side and a short side connected end to end. Optionally, a plurality of fourth magnets 2241 are arranged adjacently and in parallel along the direction of the long side; or, a plurality of fourth magnets 2241 are arranged adjacently and in parallel along the direction of the short side; or, a portion of the fourth magnets 2241 are arranged adjacently and in parallel along the direction of the long side, and another portion of the fourth magnets 2241 are arranged at both ends of the portion of the fourth magnets 2241 along the direction of the short side, or vice versa, which is not limited here.

[0143] In one embodiment, the third magnetic group 223 includes an integral third magnet 2231 of a plate-like structure, and a through hole is opened at the center of the third magnet 2231 of the plate-like structure.

[0144] In this embodiment, the third magnetic group 223 may be a third magnet 2231, and the third magnet 2231 is arranged in a square or rectangular plate-like structure. It can be understood that in order to facilitate magnetization, a through hole is provided in the center of the third magnet 2231.

[0145] Optionally, the magnetic pole of the third magnetic group 223 on the inner side close to the center thereof is opposite to the magnetic pole of the first magnetic group 221 on the side close to the second magnetic group 222 .

[0146] In one embodiment, the third magnetic group 223 includes a plurality of third magnets 2231 , which are adjacently arranged and located between the second magnetic group 222 and the fourth magnetic group 224 ; wherein the plurality of third magnets 2231 are magnetized along a vibration direction perpendicular to the vibration system 3 .

[0147] In this embodiment, if Figures 3 to 5 , Fig. 9 As shown, by setting the third magnetic group 223 as a plurality of third magnets 2231, the plurality of third magnets 2231 are laid flat between the second magnetic group 222 and the fourth magnetic group 224. Optionally, the plurality of third magnets 2231 are all magnetized in a horizontal direction, that is, the plurality of third magnets 2231 are all magnetized in a direction perpendicular to the movement of the voice coil 32, and the plurality of third magnets 2231 are all magnetized from the periphery to the center, or from the center to the periphery, which is not limited here.

[0148] It can be understood that the third magnetic group 223 can be an integral third magnet 2231 of a square plate-like structure, which is arranged between the second magnetic group 222 and the fourth magnetic group 224; or, the third magnetic group 223 includes a plurality of third magnets 2231, and the plurality of third magnets 2231 are adjacently and parallelly arranged between the second magnetic group 222 and the fourth magnetic group 224, so that the plurality of third magnets 2231 cooperate to form a square plate-like structure, which is not limited here.

[0149] In this embodiment, the voice coil 32 is in a rectangular ring shape, and has a long side and a short side connected end to end. Optionally, a plurality of third magnets 2231 are arranged adjacently and in parallel along the long side; or, a plurality of third magnets 2231 are arranged adjacently and in parallel along the short side; or, a portion of the third magnets 2231 are arranged adjacently and in parallel along the long side, and another portion of the third magnets 2231 are arranged at both ends of the portion of the third magnets 2231 along the short side, or vice versa, which is not limited here.

[0150] In one embodiment, the voice coil 32 is in a rectangular ring shape, and the voice coil 32 has a long side and a short side connected end to end; the third magnetic group 223 includes two third magnets 2231, and the two third magnets 2231 are adjacent to each other and arranged in parallel along the long side. The two third magnets 2231 are magnetized along the long side, and the magnetization directions of the two third magnets 2231 are opposite.

[0151] In this embodiment, if Figure 4 and Figure 5 As shown, by configuring the third magnetic group 223 to include two third magnets 2231 , the two third magnets 2231 are laid out in a long-side direction and are located between the second magnetic group 222 and the fourth magnetic group 224 .

[0152] Optionally, the two third magnets 2231 are magnetized in the horizontal direction, and the magnetization directions of the two third magnets 2231 are opposite. The two third magnets 2231 are magnetized from the voice coil 32 in the direction of the sides where the two third magnets 2231 abut against each other; or, the two third magnets 2231 are magnetized from the sides where the two third magnets 2231 abut against each other in the direction of the voice coil 32, which is not limited here. In this embodiment, the magnetic poles of the two third magnets 2231 facing the voice coil 32 are the same, that is, the magnetic poles of the two third magnets 2231 facing the voice coil 32 are both N poles or both S poles, which is not limited here.

[0153] Optionally, the multiple third magnets 2231 of the third magnetic group 223 are magnetized in the horizontal direction, the magnetization directions of the multiple third magnets 2231 are perpendicular to the length extension direction of each third magnet 2231, and the polarities of the ends of the long sides of the multiple third magnets 2231 facing the voice coil 32 are all N poles or all S poles, which is not limited here.

[0154] In one embodiment, the voice coil 32 is in a rectangular ring shape, and the voice coil 32 has a long side and a short side connected end to end. The third magnetic group 223 includes two third magnets 2231, and the two third magnets 2231 are adjacent to and arranged in parallel along the direction of the short side. The two third magnets 2231 are magnetized along the direction of the short side, and the magnetization directions of the two third magnets 2231 are opposite.

[0155] In this embodiment, if Figure 4 and Figure 5 As shown, by configuring the third magnetic group 223 to include two third magnets 2231 , the two third magnets 2231 are laid out in a short-side direction and are located between the second magnetic group 222 and the fourth magnetic group 224 .

[0156] Optionally, the two third magnets 2231 are magnetized in the horizontal direction, and the magnetization directions of the two third magnets 2231 are opposite. The two third magnets 2231 are magnetized from the voice coil 32 in the direction of the sides where the two third magnets 2231 abut against each other; or, the two third magnets 2231 are magnetized from the sides where the two third magnets 2231 abut against each other in the direction of the voice coil 32, which is not limited here. In this embodiment, the magnetic poles of the two third magnets 2231 facing the voice coil 32 are the same, that is, the magnetic poles of the two third magnets 2231 facing the voice coil 32 are both N poles or both S poles, which is not limited here.

[0157] In one embodiment, the voice coil 32 is in a rectangular ring shape, and the voice coil 32 has a long side and a short side connected end to end. The third magnetic group 223 includes four third magnets 2231, two third magnets 2231 are adjacent and arranged in parallel along the short side, and the other two third magnets 2231 are arranged at both ends of the two third magnets 2231 along the long side. The four third magnets 2231 are magnetized along the short side and the long side, respectively. The magnetization directions of the two third magnets 2231 arranged along the short side are opposite, and the magnetization directions of the other two third magnets 2231 arranged along the long side are opposite.

[0158] In this embodiment, the four third magnets 2231 of the third magnetic group 223 are horizontally laid and located between the second magnetic group 222 and the fourth magnetic group 224. Two third magnets 2231 of the four third magnets 2231 are adjacent and arranged in parallel along the direction of the short sides, and the other two third magnets 2231 of the four third magnets 2231 are arranged at both ends of the two third magnets 2231 along the direction of the long sides.

[0159] Optionally, the four third magnets 2231 are all magnetized in the horizontal direction, the magnetization directions of two third magnets 2231 arranged along the short side direction among the four third magnets 2231 are opposite, the magnetization directions of the other two third magnets 2231 arranged along the long side direction among the four third magnets 2231 are opposite, and the magnetization directions of the four third magnets 2231 are all perpendicular to their respective length extension directions, and the polarities of the ends of the four third magnets 2231 facing the voice coil 32 are all N poles or all S poles, which are not limited here.

[0160] In one embodiment, the voice coil 32 is in a rectangular ring shape, and the voice coil 32 has a long side and a short side connected end to end. The third magnetic group 223 is divided along two diagonal lines to form four third magnets 2231, two third magnets 2231 are arranged in parallel along the short side, and the other two third magnets 2231 are arranged in parallel along the long side. The four third magnets 2231 are magnetized in the direction of the short side and the direction of the long side, respectively. The magnetization directions of the two third magnets 2231 arranged in the short side direction are opposite, and the magnetization directions of the other two third magnets 2231 arranged in the long side direction are opposite.

[0161] In this embodiment, if Fig. 9As shown, the upper and lower surfaces of the third magnetic group 223 are generally rectangular, and the third magnetic group 223 is divided along two diagonal lines to form four third magnets 2231. The four third magnets 2231 can be formed by cutting a piece of the third magnetic group 223, or can be formed by assembling a split structure to form the third magnetic group 223. Optionally, two third magnets 2231 are arranged in parallel along the direction of the short side, and the other two third magnets 2231 are arranged in parallel along the direction of the long side. The four third magnets 2231 are magnetized in the direction of the short side and the direction of the long side respectively, and the magnetization directions of the two third magnets 2231 arranged in the direction of the short side are opposite, and the magnetization directions of the other two third magnets 2231 arranged in the direction of the long side are opposite.

[0162] Optionally, the polarities of the ends of the four third magnets 2231 facing the voice coil 32 are all N poles or all S poles. The four third magnets 2231 of the third magnetic group 223 are laid horizontally and located between the second magnetic group 222 and the fourth magnetic group 224. Optionally, two third magnets 2231 are symmetrically arranged along the short side direction at the intersection of the two diagonals of the third magnetic group 223, and the other two third magnets 2231 are symmetrically arranged along the long side direction at the intersection of the two diagonals of the third magnetic group 223.

[0163] It can be understood that the four third magnets 2231 are all arranged in a triangle shape, so that the vertex angles of the four third magnets 2231 coincide with the intersection of the two diagonals of the third magnetic group 223 .

[0164] Optionally, the four third magnets 2231 are all magnetized in the horizontal direction, the magnetization directions of the two third magnets 2231 arranged along the short side direction are opposite, the magnetization directions of the other two third magnets 2231 arranged along the long side direction are opposite, and the magnetization directions of the four third magnets 2231 are all perpendicular to the direction of the bottom edge opposite to the intersection of the two diagonals of the third magnetic group 223, and the polarities of the ends of the four third magnets 2231 facing the voice coil 32 are all N poles or all S poles, which are not limited here.

[0165] In one embodiment, the magnetization direction of the inner magnetic group 2221 is from the center of the inner magnetic group 2221 to the periphery of the inner magnetic group 2221 , and the magnetization direction of the third magnetic group 223 is from the center of the third magnetic group 223 to the periphery of the third magnetic group 223 .

[0166] In this embodiment, if Figure 4 , Figure 5 , Figure 8 and Fig. 9As shown, the inner magnetic group 2221 and the third magnetic group 223 have the same magnetizing direction. When the inner magnetic group 2221 and the third magnetic group 223 are magnetized from the center to the periphery, the first magnetic group 221 and the outer magnetic group 2223 are magnetized from bottom to top, and the fourth magnetic group 224 is magnetized from top to bottom. At this time, the third magnetic group 223, the edge magnetic portion 23 and the first magnetic group 221 cooperate to form a magnetic circuit. At the same time, the first magnetic group 221, the outer magnetic group 2223 and the fourth magnetic group 224 cooperate to gather the magnetic flux lines to the third magnetic group 223, which can reduce the discreteness of the magnetic field and increase the magnetic field, so that the central magnetic portion 22 generates a magnetic field with a stronger magnetic field strength passing through the magnetic gap 24, thereby increasing the density of the magnetic flux of the magnetic gap 24, increasing the number of magnetic flux lines passing through the voice coil 32, increasing the magnetic field force on the voice coil 32, and effectively improving the BL value.

[0167] Of course, in other embodiments, the magnetization direction of the inner magnetic group 2221 is along the direction from the periphery of the inner magnetic group 2221 to the center of the inner magnetic group 2221 , and the magnetization direction of the third magnetic group 223 is along the direction from the periphery of the third magnetic group 223 to the center of the third magnetic group 223 . It can be understood that when the magnetization directions of the inner magnetic group 2221 and the third magnetic group 223 are both from their periphery to the center, the first magnetic group 221 and the outer magnetic group 2223 are magnetized from top to bottom, and the fourth magnetic group 224 is magnetized from bottom to top. At this time, the third magnetic group 223, the edge magnetic portion 23 and the first magnetic group 221 cooperate to form a magnetic circuit. At the same time, the first magnetic group 221, the outer magnetic group 2223 and the fourth magnetic group 224 cooperate to gather the magnetic flux lines to the third magnetic group 223, which can reduce the discreteness of the magnetic field and increase the magnetic field, so that the central magnetic portion 22 generates a magnetic field with a stronger magnetic field strength passing through the magnetic gap 24, thereby increasing the density of the magnetic flux of the magnetic gap 24, increasing the number of magnetic flux lines passing through the voice coil 32, increasing the magnetic field force on the voice coil 32, and effectively improving the BL value.

[0168] In another embodiment, the inner magnetic group 2221 and the third magnetic group 223 both have a first axis and a second axis perpendicular to the vibration direction of the vibration system 3, and the first axis and the second axis are perpendicular to each other, and the magnetization direction of the inner magnetic group 2221 and the magnetization direction of the third magnetic group 223 are both along the first axis and / or the second axis.

[0169] In this embodiment, if Figure 5 , Figure 8 and Fig. 9As shown, the inner magnetic group 2221 and the third magnetic group 223 of the second magnetic group 222 are magnetized in the horizontal direction. The magnetization direction of the inner magnetic group 2221 of the second magnetic group 222 can be from the center of the inner magnetic group 2221 to the outer magnetic group 2223, and the magnetization direction of the third magnetic group 223 can be from the center of the third magnetic group 223 to the magnetic gap 24, that is, the S pole of the inner magnetic group 2221 is located at the center of the inner magnetic group 2221, and the N pole faces the outer magnetic group 2223, and the S pole of the third magnetic group 223 is located at the center of the third magnetic group 223, and the N pole faces the magnetic gap 24; or, the magnetization direction of the inner magnetic group 2221 of the second magnetic group 222 can be from the center of the outer magnetic group 2223 to the magnetic gap 24. The magnetizing direction of the third magnetic group 223 can be from the magnetic gap 24 to the center of the third magnetic group 223, that is, the S pole of the inner magnetic group 2221 faces the outer magnetic group 2223, and the N pole is located at the center of the inner magnetic group 2221, the S pole of the third magnetic group 223 faces the magnetic gap 24, and the N pole is located at the center of the third magnetic group 223; or, the magnetizing direction of the inner magnetic group 2221 and the third magnetic group 223 of the second magnetic group 222 can be along the cross axis or the two diagonals, which is not limited here.

[0170] Alternatively, if Figure 5 As shown, the magnetic pole of the inner magnetic group 2221 of the second magnetic group 222 near the inner side of the center is the same as the magnetic pole of the inner side of the third magnetic group 223 near the inner side of the center.

[0171] In one embodiment, the projection of the voice coil 32 along the vibration direction perpendicular to the vibration system 3 is located within the projection range of the third magnetic group 223 along the vibration direction perpendicular to the vibration system 3. It can be understood that such a configuration enables the magnetic flux lines of the first magnetic group 221 of the central magnetic part 22, the outer magnetic group 2223 of the second magnetic group 222, and the fourth magnetic group 224 to gather at the third magnetic group 223 and pass through the magnetic gap 24, thereby increasing the density of the magnetic flux of the magnetic gap 24, so that the voice coil 32 is in a more reasonable magnetic field, so as to alleviate the distortion of the audio output by the sound device 100 and improve the sound quality of the audio output by the sound device 100.

[0172] In this embodiment, the thickness of the first magnetic group 221 along the vibration direction of the vibration system 3 is less than the thickness of the third magnetic group 223 along the vibration direction of the vibration system 3, and the thickness of the second magnetic group 222 along the vibration direction of the vibration system 3 is less than the thickness of the third magnetic group 223 along the vibration direction of the vibration system 3. Optionally, the thickness of the first magnetic group 221 along the vibration direction of the vibration system 3 is equal to the thickness of the second magnetic group 222 along the vibration direction of the vibration system 3.

[0173] Optionally, the thickness of the third magnetic group 223 along the vibration direction of the vibration system 3 is greater than or equal to the sum of the thicknesses of the first magnetic group 221 and the second magnetic group 222 along the vibration direction of the vibration system 3. It can be understood that this can ensure that the voice coil 32 is in a more reasonable magnetic field, so that the magnetic flux lines of the first magnetic group 221 of the central magnetic part 22, the outer magnetic group 2223 of the second magnetic group 222, and the fourth magnetic group 224 are gathered in the third magnetic group 223 and pass through the magnetic gap 24, thereby increasing the density of the magnetic flux of the magnetic gap 24.

[0174] Optionally, the thickness of the third magnetic group 223 along the vibration direction of the vibration system 3 is greater than or equal to twice the thickness of the first magnetic group 221 along the vibration direction of the vibration system 3; and / or, the thickness of the third magnetic group 223 along the vibration direction of the vibration system 3 is greater than or equal to twice the thickness of the second magnetic group 222 along the vibration direction of the vibration system 3. It can be understood that this ensures that the central magnetic part 22 forms a Halbach magnetic array, which can generate a stronger magnetic field.

[0175] In order to further ensure that the voice coil 32 is in a more reasonable magnetic field, in this embodiment, along the vibration direction of the vibration system 3, the first magnetic group 221 and the second magnetic group 222 are both located below the end of the voice coil 32 away from the diaphragm 31. It can be understood that in this way, the magnetic flux lines of the first magnetic group 221 of the central magnetic part 22, the outer magnetic group 2223 of the second magnetic group 222, and the fourth magnetic group 224 can be gathered in the third magnetic group 223 and pass through the magnetic gap 24, thereby increasing the density of the magnetic flux of the magnetic gap 24.

[0176] In one embodiment, the projection area of ​​the fourth magnetic group 224 along the vibration direction of the vibration system 3 is smaller than the projection area of ​​the third magnetic group 223 along the vibration direction of the vibration system 3, the diaphragm 31 is annular, and the inner periphery of the diaphragm 31 is fixed to the periphery of the third magnetic group 223 on the side facing away from the second magnetic group 222, and is arranged around the fourth magnetic group 224.

[0177] In this embodiment, if Figure 1 , Figures 3 to 5 As shown, the size of the fourth magnetic group 224 is smaller than that of the third magnetic group 223, that is, the projection area of ​​the fourth magnetic group 224 along the vibration direction of the vibration system 3 is smaller than the projection area of ​​the third magnetic group 223 along the vibration direction of the vibration system 3, so that the fourth magnetic group 224 is located in the center of the third magnetic group 223.

[0178] It can be understood that by making the diaphragm 31 annular, the inner periphery of the diaphragm 31 is fixed to the periphery of the third magnetic group 223 on the side facing away from the second magnetic group 222, that is, the fourth magnetic group 224 is arranged in the center of the diaphragm 31, that is, a through structure for the fourth magnetic group 224 to pass through is provided in the center of the diaphragm 31, so that the third magnetic group 223 can be used to fix and seal the diaphragm 31. At the same time, 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 fourth magnetic group 224 of the central magnetic part 22 of the sound-emitting device 100 can be used to abut against the inner wall of the shell of the electronic device, without the need to increase the front cavity space additionally, and the front sound cavity structure can be formed by utilizing the height difference between the fourth magnetic group 224 of the central magnetic part 22 and the vibration system 3, which is not limited here.

[0179] Optionally, the top surface of the diaphragm 31 facing away from the magnetic circuit system 2 is not higher than the top surface of the fourth magnetic group 224 facing away from the third magnetic group 223. In this way, the overall thickness of the product can be reduced.

[0180] In one embodiment, a relief structure 2232 is provided at the edge of the third magnetic group 223. In this embodiment, the relief structure 2232 can be selected from at least one of an inclined surface, a rounded corner, a chamfer, and a step structure.

[0181] Optionally, the angle formed by the avoidance structure 2232 and the surface of the third magnetic group 223 facing away from the second magnetic group 222 is greater than 90° and less than 180°. In this embodiment, the range of the angle formed by the avoidance structure 2232 and the surface of the third magnetic group 223 facing away from the second magnetic group 222 can be further selected as 100° to 150°, which is not limited here. Optionally, the angle is 100°, 110°, 120°, 130°, 140°, 150°, etc., which is not limited here.

[0182] In this embodiment, the avoidance structure 2232 is arranged around the periphery of the third magnetic group 223 on the side facing away from the second magnetic group 222, that is, the avoidance structure 2232 is an integral annular inclined surface. Of course, in other embodiments, the avoidance structure 2232 includes multiple avoidance structures 2232, which are arranged at intervals and are arranged around the periphery of the third magnetic group 223 on the side facing away from the second magnetic group 222. In this case, two adjacent avoidance structures 2232 are not connected and have a certain spacing. Alternatively, the avoidance structure 2232 includes multiple avoidance structures 2232, which are connected end to end to form a closed annular structure and are arranged around the periphery of the third magnetic group 223 on the side facing away from the second magnetic group 222. In this case, adjacent avoidance structures 2232 in the multiple avoidance structures 2232 are adjacent and form an annular structure. Optionally, the angles formed by the plurality of avoidance structures 2232 and the surface of the third magnetic group 223 facing away from the second magnetic group 222 may be the same, different, or at least partially the same, which is not limited here.

[0183] In one embodiment, the edge magnet portion 23 includes a stacked edge magnet 231 and a edge magnetic plate 232, and the edge magnet 231 is connected to the magnetic yoke 21; wherein the first magnetic group 221, the outer magnetic group 2223, the fourth magnetic group 224 and the edge magnet 231 are all magnetized along the vibration direction of the vibration system 3, the magnetizing direction of the first magnetic group 221 and the magnetizing direction of the outer magnetic group 2223 are opposite to the magnetizing direction of the edge magnet 231, and the magnetizing direction of the fourth magnetic group 224 is the same as the magnetizing direction of the edge magnet 231.

[0184] In this embodiment, if Figures 2 to 5 As shown, the side magnets 231 and the side magnetic plates 232 of the side magnetic part 23 are stacked on the magnetic yoke 21, and the side magnets 231 are connected to the magnetic yoke 21. The side magnets 231 and the side magnetic plates 232 of the side magnetic part 23 are located outside the central magnetic part 22 and are spaced to form a magnetic gap 24.

[0185] Optionally, the magnetic pole of the side magnet 231 close to the side magnetic conductive plate 232 is opposite to the magnetic pole of the first magnetic group 221 close to the second magnetic group 222, and the magnetic pole of the side magnet 231 close to the side magnetic conductive plate 232 is opposite to the magnetic pole of the third magnetic group 223 close to the magnetic gap 24. In this way, the third magnetic group 223, the side magnetic portion 23 and the first magnetic group 221 can form a magnetic circuit. At the same time, the outer magnetic group 2223 of the first magnetic group 221 and the second magnetic group 222 cooperate with the fourth magnetic group 224 to gather the magnetic lines of force at the third magnetic group 223 and pass through the magnetic gap 24, thereby increasing the density of the magnetic flux in the magnetic gap 24.

[0186] In one embodiment, the edge magnet portion 23 may be arranged in an annular shape, in which case the annular edge magnet portion 23 is located outside the central magnet portion 22 and is spaced apart from the central magnet portion 22 to form a magnetic gap 24. Optionally, the edge magnet 231 and / or the edge magnetic conductive plate 232 form a closed integral annular structure.

[0187] Of course, in other embodiments, the edge magnetic part 23 includes a plurality of edge magnetic parts 23, which are arranged around the outside of the central magnetic part 22 and are spaced apart from the central magnetic part 22 to form a magnetic gap 24. Optionally, there are a plurality of edge magnets 231 and edge magnetic conductive plates 232, which are arranged one by one, and adjacent edge magnets 231 are connected end to end to form a closed ring structure. Alternatively, there are multiple side magnets 231 and side magnetic conductive plates 232, and they are arranged in one-to-one correspondence, and adjacent side magnets 231 are spaced to form an annular structure with a gap, and adjacent side magnetic conductive plates 232 are spaced to form an annular structure with a gap; or, the side magnets 231 form a closed integral annular structure, there are multiple side magnetic conductive plates 232, adjacent side magnetic conductive plates 232 are connected end to end to form a closed annular structure, and are arranged corresponding to the annular side magnets 231; or, the side magnetic conductive plates 232 form a closed integral annular structure, there are multiple side magnets 231, adjacent side magnets 231 are connected end to end to form a closed annular structure, and are arranged corresponding to the annular side magnetic conductive plates 232, which is not limited here.

[0188] It should be noted that, in order to facilitate the installation of the centering support piece 34, multiple side magnets 23 are arranged around the outside of the central magnet part 22, and a gap is provided between two adjacent side magnets 23 for avoiding the centering support piece 34, which is not limited here.

[0189] In this embodiment, the side magnets 231 of the side magnet portion 23 and the first magnetic group 221, the outer magnetic group 2223, and the fourth magnetic group 224 of the central magnetic portion 22 are all magnetized in the vertical direction, that is, they are all magnetized in the moving direction of the voice coil 32. Optionally, the magnetization directions of the first magnetic group 221 and the outer magnetic group 2223 are opposite to the magnetization direction of the side magnets 231 of the side magnet portion 23, and the magnetization direction of the fourth magnetic group 224 is the same as the magnetization direction of the side magnets 231 of the side magnet portion 23.

[0190] It can be understood that when the first magnetic group 221 and the outer magnetic group 2223 are magnetized from bottom to top, the fourth magnetic group 224 and the side magnet 231 are magnetized from top to bottom, and the inner magnetic group 2221 and the third magnetic group 223 are magnetized from their centers toward the magnetic gap 24, that is, when the N poles of the first magnetic group 221 and the outer magnetic group 2223 are at the top and the S poles are at the bottom, the N poles of the fourth magnetic group 224 and the side magnet 231 are at the bottom and the S poles are at the top, and the N poles of the inner magnetic group 2221 and the third magnetic group 223 face the magnetic gap 24, and the S poles are located at their centers; or When the first magnetic group 221 and the outer magnetic group 2223 are magnetized from top to bottom, the fourth magnetic group 224 and the side magnet 231 are magnetized from bottom to top, and the inner magnetic group 2221 and the third magnetic group 223 are magnetized from the magnetic gap 24 toward the center thereof, that is, when the N pole of the first magnetic group 221 and the outer magnetic group 2223 is at the bottom and the S pole is at the top, the N pole of the fourth magnetic group 224 and the side magnet 231 is at the top and the S pole is at the bottom, and the S pole of the inner magnetic group 2221 and the third magnetic group 223 faces the magnetic gap 24, and the N pole is located at the center thereof, which is not limited here.

[0191] In one embodiment, the sound-generating device 100 further includes a housing 1, one end of which is connected to the side magnetic conductive plate 232, and the other end of which is connected to the outer periphery of the diaphragm 31; wherein the side magnetic conductive plate 232 and the housing 1 are an integrally formed structure.

[0192] In this embodiment, if Figures 2 to 5 As shown, the edge magnetic part 23 includes a stacked edge magnet 231 and an edge magnetic conductive plate 232, the edge magnet 231 is connected to the magnetic conductive yoke 21, one end of the housing 1 is connected to the edge magnetic conductive plate 232, and the other end of the housing 1 is connected to the periphery of the diaphragm 31. Optionally, the edge magnetic conductive plate 232 and the housing 1 are an integrally formed structure.

[0193] It is understandable that when the housing 1 is a plastic part, the side magnetic conductive plate 232 is integrally injection molded with the housing 1. When the housing 1 is a metal part, the side magnetic conductive plate 232 and the housing 1 are formed by stamping, punching or riveting, which is not limited here. Such a setting can effectively simplify the processing steps and improve the heat dissipation effect.

[0194] In one embodiment, the diaphragm 31 is annular, the inner periphery of the diaphragm 31 is fixed to the magnetic circuit system 2 , one end of the voice coil 32 is connected to the diaphragm 31 , and the other end of the voice coil 32 is suspended in the magnetic gap 24 .

[0195] In this embodiment, the diaphragm 31 includes an inner ring portion 311, a first folded ring 313 disposed around the inner ring portion 311, a straight portion 314 disposed around the first folded ring 313, a second folded ring 315 disposed around the straight portion 314, and a fixing portion 316 connected to the outer side of the second folded ring 315, the fixing portion 316 is connected to the housing 1, one end of the voice coil 32 is directly or indirectly connected to the straight portion 314, and the inner ring portion 311 is connected to the magnetic circuit system 2. In order to strengthen the structural strength of the central portion of the diaphragm 31, the vibration system 3 further includes a vibration plate, which is disposed on the straight portion 314 of the diaphragm 31.

[0196] Optionally, the first fold ring 313 and the second fold ring 315 are in a convex structure protruding upward or a concave structure concave downward, which is not limited here.

[0197] In one embodiment, the vibration system 3 further includes a skeleton 33 , and the voice coil 32 is connected to the diaphragm 31 via the skeleton 33 .

[0198] In this embodiment, if Figure 3 and Figure 4 As shown, by providing the skeleton 33, the voice coil 32 is connected to the diaphragm 31 through the skeleton 33, so that the voice coil 32 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.

[0199] In one embodiment, the skeleton 33 includes a main body portion 331 and a connecting portion 332 connected to the periphery of the main body portion 331, and the main body portion 331 is arranged between the diaphragm 31 and the voice coil 32; the vibration system 3 also includes a centering support plate 34, one end of the centering support plate 34 is connected to the outer shell 1 and / or the edge magnetic portion 23, and the other end of the centering support plate 34 is connected to the connecting portion 332.

[0200] In this embodiment, if Figure 3 and Figure 4 As shown, the main body 331 of the skeleton 33 can be optionally an annular structure, that is, the main body 331 is arranged in an annular shape, and the main body 331 is arranged around the central magnetic part 22. Optionally, the main body 331 is arranged in a rectangular ring shape, and the connecting part 332 includes a plurality of connecting parts 332, and the plurality of connecting parts 332 are respectively arranged at the four corners of the main body 331.

[0201] It can be understood that by providing the centering support plate 34, the lead of the voice coil 32 can be connected to the external circuit by the centering support plate 34, and the voice coil 32 can be prevented from swinging or polarizing during vibration.

[0202] In one embodiment, the centering support plates 34 include a plurality of centering support plates 34, one ends of the plurality of centering support plates 34 are respectively connected to the connecting portions 332 of the frame 33, and the lead wires of the voice coil 32 extend along the connecting portions 332 to the centering support plates 34, and the other ends of the plurality of centering support plates 34 are respectively connected to the outer shell 1 and / or the edge magnetic portion 23, thereby improving the operating stability of the vibration system 3.

[0203] Optionally, multiple centering supports 34 are correspondingly distributed along the long axis direction and / or short axis direction of the magnetic circuit system 2 and / or the diagonal or four corner positions of the magnetic circuit system 2. It can be understood that multiple centering supports 34 can be symmetrically distributed along the long axis direction of the magnetic circuit system 2; multiple centering supports 34 can also be symmetrically distributed along the short axis direction of the magnetic circuit system 2; multiple centering supports 34 can also be correspondingly arranged at the diagonal positions of the magnetic circuit system 2; multiple centering supports 34 can also be correspondingly arranged at the four corner positions of the magnetic circuit system 2. Of course, in other embodiments, multiple centering supports 34 can be correspondingly distributed along the long axis direction of the magnetic circuit system 2, the short axis direction of the magnetic circuit system 2, and the diagonal or four corner positions of the magnetic circuit system 2, which is not limited here.

[0204] Optionally, the centering support plates 34 include two or four. Such an arrangement can not only utilize the centering support plates 34 to connect the voice coil 32 to the external circuit, but also ensure the vibration balance of the sound-generating device 100 .

[0205] It can be understood that when there are two centering supports 34, the two centering supports 34 are arranged at intervals along the long axis direction of the magnetic circuit system 2; or, the two centering supports 34 are arranged at intervals along the short axis direction of the magnetic circuit system 2, which is not limited here. Of course, when there are four centering supports 34, the four centering supports 34 can also be arranged correspondingly along the four corners of the magnetic circuit system 2. The present invention does not specifically limit the arrangement of the centering supports 34.

[0206] In one embodiment, the centering support piece 34 includes an outer fixing portion 341 , an inner fixing portion 342 , and an elastic arm portion 343 connecting the outer fixing portion 341 and the inner fixing portion 342 . The outer fixing portion 341 is connected to the outer shell 1 and / or the edge magnetic portion 23 , and the inner fixing portion 342 is connected to the connecting portion 332 .

[0207] In this embodiment, the inner fixing portion 342 is provided with an inner pad, and the lead wire of the voice coil 32 extends along the connecting portion 332 to the inner pad. Figure 2 and Figure 3 As shown, the outer fixing portion 341, the elastic arm portion 343 and the inner fixing portion 342 of the centering support 34 can be an integrally formed structure. This can effectively ensure the structural strength of the centering support 34 and simplify the processing steps of the centering support 34. In order to ensure the deformation ability of the centering support 34, the elastic arm portion 343 can be optionally provided with at least one bend.

[0208] It can be understood that in order to facilitate the lead routing connection of the voice coil 32 and smoothly connect and conduct with the external circuit, the inner fixing portion 342 is provided with an inner pad, and the lead of the voice coil 32 extends along the connecting portion 332 to the inner pad.

[0209] In one embodiment, if Figure 2 and Figure 3 As shown, the outer fixing portion 341, the elastic arm portion 343 and the inner fixing portion 342 of the centering support 34 can be located in the same plane. Of course, in other embodiments, the outer fixing portion 341 and the inner fixing portion 342 of the centering support 34 can also be located in different planes. It can be understood that the centering support 34 is used to connect the external circuit to the voice coil 32, and the centering support 34 can also be used to effectively prevent the voice coil 32 from swinging or polarizing during vibration.

[0210] In one embodiment, if Figure 3 As shown, the vibration system 3 also includes a skeleton 33, the skeleton 33 includes a main body 331 and a connecting portion 332 connected to the periphery of the main body 331, the main body 331 is arranged between the diaphragm 31 and the voice coil 32; the vibration system 3 also includes a centering support plate 34, the centering support plate 34 includes an external fixing portion 341, an internal fixing portion 342 and an elastic arm portion 343 connecting the external fixing portion 341 and the internal fixing portion 342, the external fixing portion 341 is connected to the outer shell 1 and / or the edge magnetic portion 23, and the internal fixing portion 342 is connected to the connecting portion 332.

[0211] In one embodiment, the diaphragm 31 includes an inner ring portion 311, a first folded ring 313 arranged around the inner ring portion 311, a straight portion 314 arranged around the first folded ring 313, a second folded ring 315 arranged around the straight portion 314, and a fixed portion 316 connected to the outer side of the second folded ring 315, the fixed portion 316 is connected to the outer shell 1, the straight portion 314 is directly or indirectly connected to the voice coil 32, and the inner ring portion 311 is connected to the third magnetic group 223; wherein the inner ring portion 311 is formed with an inner ring hole 312, and the fourth magnetic group 224 is protruding from the inner ring hole 312.

[0212] In this embodiment, if Figure 1 , Figure 3 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 .

[0213] It can be understood that the first fold ring 313 and the second fold ring 315 of the diaphragm 31 are in an upwardly protruding convex structure or a downwardly concave structure, which is not limited here. Optionally, the protruding direction of the first fold ring 313 is opposite to the protruding direction of the second fold ring 315. In this embodiment, the first fold ring 313 protrudes in a direction away from the magnetic yoke 21, and the second fold ring 315 protrudes in a direction close to the magnetic yoke 21, that is, the protruding direction of the first fold ring 313 is upward, which can effectively avoid interference with the central magnetic part 22; the protruding direction of the second fold ring 315 is downward, so when the sound-emitting device 100 is applied to an electronic device, the height difference between the first fold ring 313 and the second fold ring 315 of the diaphragm 31 can be used to form a front sound cavity structure, so as to effectively reduce the height dimension of the electronic device in the Z direction.

[0214] It should be noted that the diaphragm 31 and the voice coil 32 may be directly connected, for example, one end of the voice coil 32 is connected to the straight portion 314 of the diaphragm 31, and the other end of the voice coil 32 is suspended in the magnetic gap 24. Of course, the diaphragm 31 and the voice coil 32 may also be indirectly connected, for example, the diaphragm 31 is connected to the voice coil 32 through the skeleton 33, that is, the straight portion 314 of the diaphragm 31 is connected to the main body 331 of the skeleton 33, and the side of the main body 331 facing away from the straight portion 314 is connected to one end of the voice coil 32, and the other end of the voice coil 32 is suspended in the magnetic gap 24, which is not limited here.

[0215] In this embodiment, the inner ring portion 311 of the diaphragm 31 may be a sealed structure, that is, the inner ring portion 311 is in a straight plate shape, and is connected and fitted to a side of the fourth magnetic group 224 facing away from the third magnetic group 223 .

[0216] Of course, the diaphragm 31 may also be arranged in an annular shape, in which case an inner ring hole 312 is formed in the center of the inner ring portion 311, and the inner ring portion 311 is connected to the edge of the third magnetic group 223, so that the fourth magnetic group 224 is arranged corresponding to the inner ring hole 312. In this embodiment, the fourth magnetic group 224 is convexly arranged in the inner ring hole 312, that is, the inner ring portion 311 of the diaphragm 31 is connected to the edge of the third magnetic group 223.

[0217] In one embodiment, if Figure 3 and Figure 4 As shown, the diaphragm 31 further includes a reinforcement portion 318, which is disposed on the straight portion 314. It can be understood that by providing the reinforcement portion 318, the structural strength of the straight portion 314 of the diaphragm 31 can be effectively strengthened, thereby improving the connection stability of the voice coil 32, and avoiding the diaphragm 31 from tearing when the voice coil 32 drives the diaphragm 31 to vibrate. Optionally, the reinforcement portion 318 is disposed between the straight portion 314 and the frame 33.

[0218] In one embodiment, if Figure 3 and Figure 4As shown, one end of the fixing portion 316 away from the second fold ring 315 is bent and extended toward the housing 1 to form a bent portion 317, and the bent portion 317 is connected to the outer wall of the housing 1. It can be understood that by bending downward on the outer side of the fixing portion 316 to form the bent portion 317, the bent portion 317 is connected to the outer wall of the housing 1, thereby increasing the connection area with the housing 1, improving the connection stability and sealing performance.

[0219] The present invention further provides an electronic device, which includes the above-mentioned sound-generating device 100. The specific structure of the sound-generating device 100 refers to the above-mentioned embodiment. Since the electronic device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0220] In one embodiment, the electronic device further includes a device housing, the device housing has an installation space, and the sound-generating device 100 is disposed in the installation space of the device housing.

[0221] In this embodiment, the electronic device further includes a flexible circuit board, one end of which is electrically connected to the sound-generating device 100, and the other end of which is used to connect to an external power source. It can be understood that the flexible circuit board is used to connect the external circuit to the sound-generating device 100. The flexible circuit board is provided with an inner pad and an outer pad, the inner pad of the flexible circuit board is connected to the sound-generating device 100, and the outer pad of the flexible circuit board is used to connect to an external terminal.

[0222] In this embodiment, the device housing has an installation space, the sound device 100 is disposed in the installation space of the device housing, and at least one end of the flexible circuit board connected to the sound device 100 is located in the installation space of the device housing. Of course, in other embodiments, the flexible circuit board can also be entirely disposed in the installation space of the device housing, which is not limited here.

[0223] It is understandable that the electronic device can be headphones, mobile phones, MP3, MP4, computers, tablet computers, smart wearable devices, etc., which are not limited here. In the electronic device, the sound device 100 can be assembled into the housing of the electronic device in the form of a module, or it can be assembled into the housing of the electronic device in the form of a single body.

[0224] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied 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: A magnetic circuit system, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion and a side magnetic portion arranged on the magnetic yoke, the side magnetic portion being located outside the central magnetic portion and spaced apart from the central magnetic portion to form a magnetic gap, the central magnetic portion comprising a first magnetic group, a second magnetic group, a third magnetic group and a fourth magnetic group sequentially stacked on the magnetic yoke, the second magnetic group comprising an inner magnetic group and an outer magnetic group laid flat between the first magnetic group and the third magnetic group, the outer magnetic group being arranged around the inner magnetic group; and A vibration system, the vibration system comprising a diaphragm and a voice coil connected to the diaphragm, one end of the voice coil being suspended in the magnetic gap; Among them, the first magnetic group, the outer magnetic group and the fourth magnetic group are all magnetized along the vibration direction of the vibration system, the inner magnetic group and the third magnetic group are all magnetized along the vibration direction perpendicular to the vibration direction of the vibration system, the magnetic pole of the first magnetic group close to the second magnetic group is the same as the magnetic pole of the outer magnetic group close to the third magnetic group, the magnetic pole of the first magnetic group close to the second magnetic group is the same as the magnetic pole of the fourth magnetic group close to the third magnetic group, the magnetic pole of the third magnetic group close to the magnetic gap is the same as the magnetic pole of the inner magnetic group close to the outer magnetic group, the magnetic pole of the first magnetic group close to the second magnetic group is the same as the magnetic pole of the third magnetic group close to the magnetic gap, and the central magnetic part is provided with a weight reduction space.

2. The sound-generating device according to claim 1, characterized in that: The weight reduction space is provided in the center of the first magnetic group; And / or, the weight reduction space is provided in the center of the second magnetic group; And / or, the weight reduction space is provided in the center of the third magnetic group; And / or, the weight reduction space is provided in the center of the fourth magnetic group; And / or, the weight reduction space is a through hole or a groove.

3. The sound generating device according to claim 1, characterized in that: The first magnetic group is provided with a first weight-reducing hole, the inner magnetic group is provided with a second weight-reducing hole, the first weight-reducing hole is correspondingly connected with the second weight-reducing hole, and cooperates to form the weight-reducing space; The magnetic conductive yoke is provided with a third weight-reducing hole corresponding to the first weight-reducing hole, and the third weight-reducing hole is correspondingly connected to the weight-reducing space.

4. The sound-generating device according to claim 3, characterized in that: The magnetic conductive yoke is provided with a magnetic conductive column located in the weight reduction space; The magnetic conductive column is an integral cylindrical structure, and the magnetic conductive column of the cylindrical structure is arranged around the third weight-reducing hole and abuts against the first magnetic group and the inner magnetic group; or, the magnetic conductive column includes a plurality of magnetic conductive columns, and the plurality of magnetic conductive columns are arranged around the third weight-reducing hole and abut against the first magnetic group and the inner magnetic group respectively; And / or, one end of the magnetically conductive column away from the magnetically conductive yoke abuts against the third magnetic group.

5. The sound generating device according to claim 3, characterized in that: The first magnetic group is provided with a plurality of the first weight-reducing holes, the inner magnetic group is provided with a plurality of the second weight-reducing holes, and the plurality of the first weight-reducing holes and the plurality of the second weight-reducing holes are arranged in one-to-one correspondence to form a plurality of the weight-reducing spaces.

6. The sound generating device according to claim 3, characterized in that: The first magnetic group includes a first magnet, and the first magnet forms a closed integral annular structure to form the first weight-reducing hole in the center of the first magnetic group; or, the first magnetic group includes a plurality of first magnets, and adjacent first magnets are connected end to end to form a closed annular structure to form the first weight-reducing hole in the center of the first magnetic group; or, the first magnetic group includes a plurality of first magnets, and adjacent first magnets are spaced to form an annular structure with gaps to form the first weight-reducing hole in the center of the first magnetic group; And / or, the inner magnetic group includes an inner magnet, and the inner magnet forms a closed integral annular structure to form the second weight-reducing hole in the center of the inner magnetic group; or, the inner magnetic group includes a plurality of inner magnets, and adjacent inner magnets are connected end to end to form a closed annular structure to form the second weight-reducing hole in the center of the inner magnetic group; or, the inner magnetic group includes a plurality of inner magnets, and adjacent inner magnets are spaced apart to form an annular structure with a gap to form the second weight-reducing hole in the center of the inner magnetic group; And / or, the outer magnetic group includes an outer magnet, the outer magnet forms a closed integral ring structure, and is arranged around the inner magnetic group; or, the outer magnetic group includes a plurality of outer magnets, adjacent outer magnets are connected end to end to form a closed ring structure, and are arranged around the inner magnetic group; or, the outer magnetic group includes a plurality of outer magnets, adjacent outer magnets are arranged at intervals to form a ring structure with gaps, and are arranged around the inner magnetic group; And / or, the fourth magnetic group includes a fourth magnet with an integral plate-like structure; or, the fourth magnetic group includes a plurality of fourth magnets, the plurality of fourth magnets are adjacent to and laid flat on a side of the third magnetic group facing away from the second magnetic group, the plurality of fourth magnets are magnetized along the vibration direction of the vibration system, and the magnetization directions of the plurality of fourth magnets are the same.

7. The sound generating device according to claim 3, characterized in that: The voice coil is in a rectangular ring shape, and has a long side and a short side connected end to end; The third magnetic group includes two third magnets, the two third magnets are adjacent to each other and arranged in parallel along the direction of the long side, the two third magnets are magnetized along the direction of the long side, and the magnetization directions of the two third magnets are opposite; Or, the third magnetic group includes two third magnets, the two third magnets are adjacent to each other and arranged in parallel along the direction of the short side, the two third magnets are magnetized along the direction of the short side, and the magnetization directions of the two third magnets are opposite; Or, the third magnetic group includes four third magnets, two of the third magnets are adjacent and arranged in parallel along the direction of the short side, and the other two third magnets are arranged at both ends of the two third magnets along the direction of the long side, and the four third magnets are magnetized along the direction of the short side and the direction of the long side respectively, the magnetization directions of the two third magnets arranged along the short side are opposite, and the magnetization directions of the other two third magnets arranged along the long side are opposite; Alternatively, the third magnetic group is divided along two diagonal lines to form four third magnets, two of the third magnets are arranged in parallel along the direction of the short side, and the other two of the third magnets are arranged in parallel along the direction of the long side. The four third magnets are magnetized along the direction of the short side and the direction of the long side, respectively. The magnetization directions of the two third magnets arranged along the short side are opposite, and the magnetization directions of the other two third magnets arranged along the long side are opposite.

8. The sound generating device according to claim 1, characterized in that: The magnetization direction of the first magnetic group is the same as that of the outer magnetic group, the magnetization direction of the first magnetic group is opposite to that of the fourth magnetic group, and the magnetization direction of the inner magnetic group is the same as that of the third magnetic group.

9. The sound generating device according to claim 1, characterized in that: The magnetization direction of the inner magnetic group is along the direction from the center of the inner magnetic group to the periphery of the inner magnetic group, and the magnetization direction of the third magnetic group is along the direction from the center of the third magnetic group to the periphery of the third magnetic group; Alternatively, the inner magnetic group and the third magnetic group both have a first axis and a second axis that are perpendicular to the vibration direction of the vibration system, and the first axis and the second axis are perpendicular to each other, and the magnetization direction of the inner magnetic group and the magnetization direction of the third magnetic group are both along the first axis and / or the second axis.

10. The sound generating device according to claim 1, characterized in that: The projection of the voice coil along the vibration direction perpendicular to the vibration system is located within the projection range of the third magnetic group along the vibration direction perpendicular to the vibration system; And / or, the thickness of the third magnetic group along the vibration direction of the vibration system is greater than or equal to the sum of the thicknesses of the first magnetic group and the second magnetic group along the vibration direction of the vibration system; And / or, along the vibration direction of the vibration system, the first magnetic group and the second magnetic group are both located below an end of the voice coil away from the diaphragm.

11. The sound generating device according to claim 1, characterized in that: The projection area of ​​the fourth magnetic group along the vibration direction of the vibration system is smaller than the projection area of ​​the third magnetic group along the vibration direction of the vibration system, the diaphragm is annular, the inner periphery of the diaphragm is fixed to the periphery of the third magnetic group on the side facing away from the second magnetic group, and is arranged around the fourth magnetic group; And / or, the top surface of the diaphragm facing away from the magnetic circuit system is not higher than the top surface of the fourth magnetic group facing away from the third magnetic group.

12. The sound generating device according to claim 1, characterized in that: The edge of the third magnetic group is provided with an avoidance structure, and the avoidance structure is at least one of an inclined surface, a fillet, a chamfer, and a step structure; The avoidance structure is disposed around the periphery of the third magnetic group on the side facing away from the second magnetic group; or, the avoidance structure includes a plurality of avoidance structures, the plurality of avoidance structures are arranged at intervals, and are disposed around the periphery of the third magnetic group on the side facing away from the second magnetic group; or, the avoidance structure includes a plurality of adjacent avoidance structures connected end to end to form a closed ring structure, and are disposed around the periphery of the third magnetic group on the side facing away from the second magnetic group; And / or, an angle formed by the avoidance structure and a surface of the third magnetic group facing away from the second magnetic group is greater than 90° and less than 180°.

13. The sound generating device according to any one of claims 1 to 12, characterized in that: The edge magnet part includes a stacked edge magnet and an edge magnetic conductive plate, and the edge magnet is connected to the magnetic conductive yoke; Among them, the first magnetic group, the external magnetic group, the fourth magnetic group and the side magnet are all magnetized along the vibration direction of the vibration system, the magnetization direction of the first magnetic group and the magnetization direction of the external magnetic group are opposite to the magnetization direction of the side magnet, and the magnetization direction of the fourth magnetic group is the same as the magnetization direction of the side magnet.

14. The sound generating device according to claim 13, characterized in that: The sound-generating device further comprises a shell, one end of which is connected to the edge magnetic plate, and the other end of which is connected to the outer periphery of the diaphragm; Wherein, the side magnetic conductive plate and the shell are an integrally formed structure.

15. The sound generating device according to claim 14, characterized in that: The vibration system further includes a frame, the frame including a main body and a connecting portion connected to the periphery of the main body, the main body being arranged between the diaphragm and the voice coil; The vibration system also includes a centering support plate, which includes an external fixing portion, an internal fixing portion, and an elastic arm portion connecting the external fixing portion and the internal fixing portion, the external fixing portion is connected to the outer shell and / or the edge magnetic portion, and the internal fixing portion is connected to the connecting portion.

16. The sound generating device according to claim 14, characterized in that: The diaphragm includes an inner ring portion, a first folded ring arranged around the inner ring portion, a straight portion arranged around the first folded ring, a second folded ring arranged around the straight portion, and a fixed portion connected to the outer side of the second folded ring, the fixed portion is connected to the housing, the straight portion is directly or indirectly connected to the voice coil, and the inner ring portion is connected to the third magnetic group; The inner ring portion is formed with an inner ring hole, and the fourth magnetic group is protrudingly arranged on the inner ring hole.

17. The sound generating device according to claim 16, characterized in that: 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 first fold ring protrudes in a direction away from the magnetic yoke, and the second fold ring protrudes in a direction close to the magnetic yoke; And / or, the diaphragm further comprises a reinforcement portion, and the reinforcement portion is arranged on the straight portion; And / or, one end of the fixing portion away from the second fold ring is bent and extended toward the shell to form a bent portion, and the bent portion is connected to the outer wall of the shell.

18. An electronic device, characterized in that: The electronic device comprises the sound emitting device according to any one of claims 1 to 17.

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