Sound generating devices and electronic equipment

Abstract

The present invention discloses a sound-generating device and an electronic device, and relates to the technical field of electroacoustic transducer. The sound-generating device comprises a magnetic circuit system and a vibration system. The magnetic circuit system comprises a magnetic yoke and a central magnetic part and a side magnetic part arranged on the magnetic yoke. The side magnetic part is located outside the central magnetic part and is spaced from the central magnetic part to form a magnetic gap. The central magnetic part comprises a first magnetic group, a second magnetic group and a third magnetic group arranged in layers. The first magnetic group is connected to the magnetic yoke. The vibration system comprises a diaphragm and a voice coil connected to the diaphragm. The voice coil is arranged corresponding to the magnetic gap. The first magnetic group and the third magnetic group are magnetized along a vibration direction perpendicular to the vibration system, and the second magnetic group is magnetized along the vibration direction of the vibration system, so that the central magnetic part forms a Halbach magnetic circuit. The sound-generating device of the present invention increases the BL value by optimizing the central magnetic part of the magnetic circuit system, effectively improves the flatness of the BL curve, significantly improves the FR frequency response curve, and effectively reduces the harmonic distortion THD, thereby improving the sound quality and performance of the whole machine.

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 demand for the sound quality of electronic devices has become 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. 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, which leads to a smaller magnetic field force on the voice coil, low sensitivity of the sound-generating device, and poor 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 increases the BL value by optimizing the central magnetic part of the magnetic circuit system, effectively improves the flatness of the BL curve, significantly improves the FR frequency response curve, and effectively reduces the harmonic distortion THD, so that the sound quality and performance of the whole machine are better improved.

[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 and a third magnetic group arranged in a stacked manner, the first magnetic group being connected to the magnetic yoke;

[0007] A vibration system, the vibration system comprising a diaphragm and a voice coil connected to the diaphragm, the voice coil being arranged corresponding to the magnetic gap;

[0008] The first magnetic group and the third magnetic group are magnetized along a vibration direction perpendicular to the vibration system, and the second magnetic group is magnetized along the vibration direction of the vibration system, so that the central magnetic part forms a Halbach magnetic circuit.

[0009] 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;

[0010] 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;

[0011] 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°.

[0012] In one embodiment, a projection of at least part of the third magnetic group along a vibration direction perpendicular to the vibration system coincides with a projection of the voice coil along a vibration direction perpendicular to the vibration system.

[0013] In one embodiment, the magnetization direction of the first magnetic group is opposite to the magnetization direction of the third magnetic group;

[0014] The magnetization direction of the first magnetic group is along the periphery of the first magnetic group toward the center of the first magnetic group, and the magnetization direction of the third magnetic group is along the center of the third magnetic group toward the periphery of the third magnetic group; or, the first magnetic group and the third magnetic group both have a first axis and a second axis perpendicular to the vibration direction of the vibration system, and the first axis and the second axis are perpendicular to each other, the magnetization direction of the first magnetic group is along the first axis and / or the second axis, and the magnetization direction of the third magnetic group is along the second axis and / or the first axis;

[0015] The magnetic poles on the inner side of the first magnetic group near the center are the same as the magnetic poles on the side of the second magnetic group away from the first magnetic group, and the magnetic poles on the inner side of the first magnetic group near the center are opposite to the magnetic poles on the inner side of the third magnetic group near the center.

[0016] In one embodiment, the first magnetic group includes a first magnet of an integral plate-shaped structure, and a first through hole is opened at the center of the first magnet of the plate-shaped structure;

[0017] The third magnetic group includes a third magnet with an integral plate-shaped structure, and a second through hole is opened at the center of the third magnet with the plate-shaped structure.

[0018] 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;

[0019] The first magnetic group includes two first magnets, the two first magnets are adjacent to each other and arranged in parallel along the direction of the long side, the two first magnets are magnetized along the direction of the long side, and the magnetization directions of the two first magnets are opposite;

[0020] Or, the first magnetic group includes two first magnets, the two first magnets are adjacent to each other and arranged in parallel along the direction of the short side, the two first magnets are magnetized along the direction of the short side, and the magnetization directions of the two first magnets are opposite;

[0021] Or, the first magnetic group includes four first magnets, two of the first magnets are adjacent and arranged in parallel along the direction of the short side, and the other two first magnets are arranged at both ends of the two first magnets along the direction of the long side, and the four first magnets are magnetized along the direction of the short side and the direction of the long side respectively, the two first magnets arranged along the short side have opposite magnetization directions, and the other two first magnets arranged along the long side have opposite magnetization directions;

[0022] Alternatively, the first magnetic group is divided along two diagonal lines to form four first magnets, two of the first magnets are arranged in parallel along the direction of the short side, and the other two of the first magnets are arranged in parallel along the direction of the long side, and the four first magnets are magnetized along the direction of the short side and the direction of the long side, respectively, the two first magnets arranged along the short side have opposite magnetization directions, and the other two first magnets arranged along the long side have opposite magnetization directions.

[0023] In one embodiment, the second magnetic group includes a second magnet having an integral plate-like structure;

[0024] Or, the second magnetic group includes a plurality of second magnets, and the plurality of second magnets are arranged adjacent to each other and located between the first magnetic group and the third magnetic group; wherein the plurality of second magnets are magnetized along the vibration direction of the vibration system, and the magnetization directions of the plurality of second magnets are the same.

[0025] 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;

[0026] 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;

[0027] 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;

[0028] 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;

[0029] 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.

[0030] In one embodiment, the edge magnet portion includes a stacked edge magnet and an edge magnetic conductive plate, and the edge magnet is connected to the magnetic conductive yoke;

[0031] The second magnetic group and the side magnets are both magnetized along the vibration direction of the vibration system, and the magnetization direction of the second magnetic group is opposite to the magnetization direction of the side magnets of the side magnet portion.

[0032] In one embodiment, the sound-generating device further comprises a shell, one end of the shell is connected to the edge magnetic conductive plate, and the other end of the shell is connected to the periphery of the diaphragm.

[0033] In one embodiment, the side magnetic conductive plate and the housing are an integrally formed structure;

[0034] And / or, the diaphragm is annular, the inner periphery of the diaphragm is fixed to the magnetic circuit system, one end of the voice coil is connected to the diaphragm, and the other end of the voice coil is suspended in the magnetic gap.

[0035] In one embodiment, the vibration system further includes a frame, and the voice coil is connected to the diaphragm through the frame.

[0036] In one embodiment, the skeleton includes a main body and a connecting portion connected to the periphery of the main body, and the main body is provided between the diaphragm and the voice coil;

[0037] The vibration system also includes a centering support plate, which includes an external fixing portion, an internal fixing portion, and an elastic wall 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.

[0038] 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;

[0039] The inner ring portion is in the shape of a straight plate and is in contact with the third magnetic group; or, the inner ring portion is formed with an inner ring hole.

[0040] 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;

[0041] 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;

[0042] And / or, the diaphragm further comprises a reinforcement portion, and the reinforcement portion is arranged on the straight portion;

[0043] 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.

[0044] The present invention further provides an electronic device, which includes the sound-generating device described above.

[0045] The sound-generating device of the technical solution of the present invention is provided by configuring the 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 outside the central magnetic part and is spaced from the central magnetic part to form a magnetic gap, and the voice coil of the vibration system is arranged corresponding to 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 configuring the central magnetic part as a first magnetic group, a second magnetic group and a third magnetic group stacked on the magnetic yoke, so that the first magnetic group and the third magnetic group are both arranged perpendicular to the vibration The vibration direction of the dynamic system is magnetized, and the second magnetic group is magnetized along the vibration direction of the vibration system, 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, increase the number of magnetic lines of force passing through the voice coil, increase the magnetic field force on the voice coil, effectively improve the BL value, improve the sensitivity of the sound-emitting device, effectively improve the flatness of the BL curve, significantly improve the FR frequency response curve, and effectively reduce the harmonic distortion THD, so that the sound effect and performance of the whole machine are better improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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.

[0047] Figure 1 A schematic structural diagram of an embodiment of a sound-generating device provided by the present invention;

[0048] Figure 2 A schematic structural diagram of another perspective of an embodiment of a sound-generating device provided by the present invention;

[0049] Figure 3 An exploded schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0050] Figure 4 A cross-sectional schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0051] Figure 5 A partial structural schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0052] Figure 6 An exploded schematic diagram of an embodiment of a central magnetic part provided by the present invention;

[0053] Figure 7 A schematic diagram of a top view of the structure of a first magnetic group according to an embodiment of the present invention;

[0054] Figure 8 A schematic diagram of a top view of the structure of an embodiment of the first magnetic group or the third magnetic group and the voice coil provided by the present invention;

[0055] Fig. 9 A schematic diagram of a top view of another embodiment of the first magnetic group or the third magnetic group and the voice coil provided by the present invention;

[0056] Fig.10 A schematic diagram of a top view of the structure of an embodiment of the first magnetic group or the third magnetic group provided by the present invention;

[0057] Fig.11 A schematic diagram of a top view of another embodiment of the first magnetic group or the third magnetic group provided by the present invention;

[0058] Fig.12 A comparison chart of the BL curves of the sound-generating device provided by the present invention and the prior art;

[0059] Fig.13 This is a comparison chart of the FR curves of the sound-generating device provided by the present invention and the prior art.

[0060] Description of Figure Numbers:

[0061] 100. Sounding device; 1. Shell; 2. Magnetic circuit system; 21. Magnetic yoke; 22. Central magnetic part; 221. First magnetic group; 2211. First magnet; 222. Second magnetic group; 2221. Second magnet; 223. Third magnetic group; 2231. Third magnet; 2232. Avoidance structure; 23. Side magnetic part; 231. Side magnet; 232. Side magnetic plate; 24. Magnetic gap; 3. Vibration system; 31. Diaphragm; 311, inner ring; 312, inner ring hole; 313, first folded ring; 314, straight portion; 315, second folded ring; 316, fixed portion; 317, bent portion; 318, reinforcement portion; 32, voice coil; 321, long side; 322, short side; 33, skeleton; 331, main body; 332, connecting portion; 34, centering support plate; 341, external fixed portion; 342, internal fixed portion; 343, elastic wall portion.

[0062] 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

[0063] 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.

[0064] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0065] 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.

[0066] 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.

[0067] 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 demand for the sound quality of electronic devices has become higher and higher, and full-range and miniaturized speakers have become mainstream demands.

[0068] At present, the box space in electronic devices is getting smaller and smaller. 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, which leads to a smaller magnetic field force on the voice coil, low sensitivity of the sound-generating device, and poor overall acoustic performance and sound effects.

[0069] Based on the above concepts and problems, the present invention proposes a sound-generating device 100. It can be understood that the sound-generating device 100 can be applied to electronic devices, and the electronic devices can be smart watches, mobile phones, speakers, computers, headphones or televisions, etc., which are not limited here.

[0070] Please refer to Figures 1 to 11 As shown, in an 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 and a third magnetic group 223 arranged in a stacked manner, the first magnetic group 221 is connected to the magnetic yoke 21, the vibration system 3 includes a diaphragm 31 and a voice coil 32 connected to the diaphragm 31, and the voice coil 32 is arranged corresponding to the magnetic gap 24; wherein the first magnetic group 221 and the third magnetic group 223 are both magnetized along a vibration direction perpendicular to the vibration system 3, and the second magnetic group 222 is magnetized along the vibration direction of the vibration system 3, so that the central magnetic portion 22 forms a Halbach magnetic circuit.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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 1 to 5 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 .

[0075] 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.

[0076] It can be understood that the sound-generating device 100 is applied to electronic devices, that is, the sound-generating device 100 can be installed in the electronic device through the housing 1. It should be noted that the housing 1 of the sound-generating device 100 can be a housing or box structure independent of the electronic device. In this case, the housing 1 is used to integrate the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 into an integral structure, so as to facilitate disassembly and assembly. Of course, the housing 1 of the sound-generating device 100 can also be an integrally formed structure with the housing or box structure of the electronic device, which can effectively improve the structural strength and sealing performance.

[0077] 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.

[0078] 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.

[0079] It should be noted that the voice coil 32 can 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 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 opposite to the magnetic gap 24; or, the voice coil 32 is 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, which is not limited here.

[0080] In order to realize the electrical connection between the voice coil 32 and the external circuit. Figures 2 to 5 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 .

[0081] 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.

[0082] In this embodiment, by setting the central magnetic part 22 as the first magnetic group 221, the second magnetic group 222 and the third magnetic group 223 stacked on the magnetic yoke 21, the first magnetic group 221 and the third magnetic group 223 of the central magnetic part 22 are magnetized along the vibration direction perpendicular to the vibration system 3, and the second magnetic group 222 is magnetized along the vibration direction of the vibration system 3, that is, the magnetization direction of the second magnetic group 222 is perpendicular to the magnetization directions of the first magnetic group 221 and the third magnetic group 223, so that the central magnetic part 22 forms a Halbach magnetic circuit, 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, and 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 effectively improving the flatness of the BL curve (such as Fig.12 As shown in the figure, the FR frequency response curve is significantly improved (as shown in the figure Fig.13 As shown in the figure, the harmonic distortion THD is effectively reduced, which improves the sound effect and performance of the whole machine.

[0083] It should be noted that Fig.12 This is a comparison diagram of the BL curve of the sound-emitting device 100 of the present application and the BL curve of an existing conventional speaker, where the horizontal axis of the BL curve is the amplitude mm and the vertical axis is the BL value Tm. It can be seen that the BL curve of the sound-emitting device 100 of the present application is more symmetrical than the BL curve of the existing conventional speaker, and the BL value of the sound-emitting device 100 of the present application is higher than the BL value of the existing conventional speaker. Fig.13 This is a comparison diagram of the FR curve of the sound-generating device 100 of the present application and the FR curve of the conventional speaker of the prior art, where the horizontal coordinate of the FR curve is Hz and the vertical coordinate is db. It can be seen that when the frequency is less than 1000 Hz, the FR curve of the sound-generating device 100 of the present application is significantly higher than the FR curve of the conventional speaker of the prior art; when the frequency is greater than 1000 Hz to about 10000 Hz, the FR curve of the sound-generating device 100 of the present application is also significantly higher than the FR curve of the conventional speaker of the prior art.

[0084] Optionally, the vibration direction of the vibration system 3 in this embodiment can be selected as a vertical direction. In this embodiment, the central magnetic portion 22 is configured as a first magnetic group 221, a second magnetic group 222 and a third magnetic group 223 stacked on the magnetic yoke 21, that is, the first magnetic group 221, the second magnetic group 222 and the third magnetic group 223 are stacked on the magnetic yoke 21 along the vertical direction.

[0085] Optionally, the first magnetic group 221 and the third magnetic group 223 of the central magnetic part 22 are magnetized in the horizontal direction. It can be understood that the magnetization direction of the second magnetic group 222 is perpendicular to the magnetization directions of the first magnetic group 221 and the third magnetic group 223, that is, the second magnetic group 222 is magnetized in the vertical direction. It should be noted that Figure 4 , Figure 5 , Figures 7 to 11The 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.

[0086] 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.

[0087] In this embodiment, the first magnetic group 221, the second magnetic group 222 and the third magnetic group 223 of the central magnetic portion 22 are 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, and the third magnetic group 223 is stacked on the side of the second magnetic group 222 facing away from the first magnetic group 221.

[0088] Optionally, the first magnetic group 221 , the second magnetic group 222 and the third magnetic group 223 of the central magnetic portion 22 are in a square plate-shaped structure, which is not limited here.

[0089] In this embodiment, if Figures 3 to 6 As shown, by magnetizing the first magnetic group 221 and the third magnetic group 223 of the central magnetic part 22 in the horizontal direction and the second magnetic group 222 in the vertical direction, that is, the magnetizing direction of the second magnetic group 222 is perpendicular to the magnetizing directions of the first magnetic group 221 and the third magnetic group 223, the first magnetic group 221, the second magnetic group 222 and the third magnetic group 223 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, and improving the sensitivity of the sound-generating device 100, so that the sound effect and performance of the whole machine are better improved.

[0090] It can be understood that the first magnetic group 221 and the third magnetic group 223 are magnetized in a direction perpendicular to the vibration direction of the vibration system 3, that is, they are magnetized in a direction perpendicular to the movement direction of the voice coil 32. Optionally, the first magnetic group 221 and the third magnetic group 223 are magnetized in a horizontal direction. In this embodiment, the first magnetic group 221 and the third magnetic group 223 of the central magnetic part 22 are magnetized in a horizontal direction, and the magnetization direction of the second magnetic group 222 is perpendicular to the magnetization direction of the first magnetic group 221 and the third magnetic group 223, that is, the second magnetic group 222 is magnetized in a vertical direction to effectively superimpose and form a magnetic field with a higher magnetic field strength.

[0091] In one embodiment, at least a portion of the projection of the third magnetic group 223 along the vibration direction perpendicular to the vibration system 3 coincides with the projection of the voice coil 32 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, the second magnetic group 222 and the third magnetic group 223 of the central magnetic portion 22 to gather 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, 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-generating device 100 and improve the sound quality of the audio output by the sound-generating device 100. Optionally, the projection of the voice coil 32 along the horizontal direction is located in the projection of the third magnetic group 223 along the horizontal direction.

[0092] In one embodiment, the edge of the third magnetic group 223 is provided with a avoidance structure 2232. Figure 3 and Figure 4 As shown, by setting an avoidance structure 2232 at the edge of the third magnetic group 223, that is, setting a rounded corner, a chamfered corner, a cut corner or a step structure at the edge of the third magnetic group 223, the diaphragm 31 can be avoided, and magnetic leakage can be effectively prevented to improve the BL value.

[0093] Optionally, the avoidance structure 2232 is at least one of an inclined surface, a rounded corner, a chamfer, and a step structure.

[0094] In one embodiment, the avoidance structure 2232 may be an inclined surface. 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 inclined surface of the avoidance structure 2232 and the surface of the third magnetic group 223 facing away from the second magnetic group 222 may further be selected to be 100° to 150°, which is not limited here. Optionally, the angle is 100°, 110°, 120°, 130°, 140°, 150°, etc., which is not limited here.

[0095] It can be understood that the avoidance structure 2232 surrounds 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 surround the periphery of the third magnetic group 223 on the side facing away from the second magnetic group 222. In this case, the two adjacent avoidance structures 2232 are not connected and have a certain spacing. Alternatively, the avoidance structure 2232 includes multiple, adjacent avoidance structures 2232 are connected end to end to form a closed annular structure, and surround the periphery of the third magnetic group 223 on the side facing away from the second magnetic group 222. In this case, the 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.

[0096] Optionally, the thickness of the first magnetic group 221 along the vibration direction of the vibration system 3 is less than or equal to the thickness of the second magnetic group 222 along the vibration direction of the vibration system 3. 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 thickness of the second magnetic group 222 along the vibration direction of the vibration system 3. 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 thickness of the first magnetic group 221 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.

[0097] In one embodiment, the magnetization direction of the first magnetic group 221 is opposite to the magnetization direction of the third magnetic group 223. Figure 4 and Figure 5 As shown, the vibration direction of the vibration system 3 may be selected as the vertical direction, and the vibration direction perpendicular to the vibration system 3 may be selected as the horizontal direction. The first magnetic group 221 and the third magnetic group 223 are both magnetized in the horizontal direction.

[0098] It can be understood that when the magnetization direction of the first magnetic group 221 can be from the magnetic gap 24 to the center of the first magnetic group 221, 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 first magnetic group 221 faces the magnetic gap 24, the N pole is located at the center of the first magnetic group 221, the S pole of the third magnetic group 223 is located at the center of the first magnetic group 221, and the N pole faces the magnetic gap 24; or, when the magnetization direction of the first magnetic group 221 can be from the center of the first magnetic group 221 to the magnetic gap 24, the magnetization 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 first magnetic group 221 is located at the center of the first magnetic group 221, the N pole faces the magnetic gap 24, 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, which is not limited here.

[0099] Alternatively, if Figure 4 , Figure 5 and Figure 7 As shown, the magnetization direction of the first magnetic group 221 is along the periphery of the first magnetic group 221 toward the center of the first magnetic group 221, and the magnetization direction of the third magnetic group 223 is along the center of the third magnetic group 223 toward the periphery of the third magnetic group 223; or, the magnetization direction of the first magnetic group 221 is along the center of the first magnetic group 221 toward the periphery of the first magnetic group 221, and the magnetization direction of the third magnetic group 223 is along the periphery of the third magnetic group 223 toward the center of the third magnetic group 223.

[0100] In one embodiment, the first magnetic group 221 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. The magnetization direction of the first magnetic group 221 is along the first axis and / or the second axis, and the magnetization direction of the third magnetic group 223 is along the second axis and / or the first axis.

[0101] In this embodiment, if Figure 5 , Figures 7 to 9 , Fig.11As shown, the first magnetic group 221 and the third magnetic group 223 are both magnetized in the horizontal direction. It can be understood that when the first magnetic group 221 is magnetized in the horizontal direction, the magnetization direction of the first magnetic group 221 can be from the magnetic gap 24 to the center of the first magnetic group 221, 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 first magnetic group 221 faces the magnetic gap 24, and the N pole is located at the center of the first magnetic group 221, and the S pole of the third magnetic group 223 is located at the center of the first magnetic group 221, and the N pole faces the magnetic gap 24; or, the magnetization direction of the first magnetic group 221 When it can be from the center of the first magnetic group 221 to the magnetic gap 24, the magnetization 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 first magnetic group 221 is located at the center of the first magnetic group 221, and the N pole faces the magnetic gap 24, 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 magnetization direction of the first magnetic group 221 and the third magnetic group 223 can be along the cross axis or the two diagonals, which is not limited here.

[0102] Alternatively, if Figure 4 As shown, the magnetic pole of the first magnetic group 221 near its center is the same as the magnetic pole of the second magnetic group 222 away from the first magnetic group 221, and the magnetic pole of the first magnetic group 221 near its center is opposite to the magnetic pole of the third magnetic group 223 near its center.

[0103] In this embodiment, when the magnetization direction of the first magnetic group 221 is from the periphery of the first magnetic group 221 to the center of the first magnetic group 221, 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, and the second magnetic group 222 is magnetized from bottom to top, that is, the second magnetic group 222 is magnetized upward in the vertical direction. When the magnetization direction of the first magnetic group 221 is from the center of the first magnetic group 221 to the periphery of the first magnetic group 221, the magnetization direction of the third magnetic group 223 is from the periphery of the third magnetic group 223 to the center of the third magnetic group 223, and the second magnetic group 222 is magnetized from top to bottom, that is, the second magnetic group 222 is magnetized downward in the vertical direction, which is not limited here.

[0104] It should be noted that the second magnetic group 222 is magnetized along the vibration direction of the vibration system 3, that is, the second magnetic group 222 is magnetized along the vertical direction. Figure 4 As shown, the second magnetic group 222 is magnetized from bottom to top, that is, the N pole of the second magnetic group 222 is at the top and the S pole is at the bottom; or, the first magnetic group 221 is magnetized from top to bottom, that is, the N pole of the first magnetic group 221 is at the bottom and the S pole is at the top, which is not limited here.

[0105] It can be understood that the magnetizing direction of the first magnetic group 221 is opposite to that of the third magnetic group 223, and the second magnetic group 222 is magnetized in the vertical direction, so that the magnetic flux lines of the first magnetic group 221, the second magnetic group 222 and the third magnetic group 223 of the central magnetic part 22 are gathered in the third magnetic group 223, and the magnetic field with a stronger 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.

[0106] In one embodiment, the first magnetic group 221 includes an integral first magnet 2211 of a plate-like structure, and a first through hole is opened at the center of the first magnet 2211 of the plate-like structure.

[0107] In this embodiment, if Fig.10 As shown, the first magnetic group 221 can be selected as a first magnet 2211, and the first magnet 2211 is arranged in a square or rectangular plate-like structure. It can be understood that in order to facilitate magnetization, a first through hole is opened in the center of the first magnet 2211, and the first through hole passes through the first magnet 2211.

[0108] In one embodiment, the third magnetic group 223 includes an integral third magnet 2231 of a plate-like structure, and a second through hole is opened at the center of the third magnet 2231 of the plate-like structure.

[0109] In this embodiment, if Fig.10 As shown, the third magnetic group 223 can be selected as a third magnet 2231, and the third magnet 2231 is arranged in a square or rectangular plate structure. It can be understood that in order to facilitate magnetization, a second through hole is opened in the center of the third magnet 2231, and the second through hole passes through the third magnet 2231.

[0110] It can be understood that when the first magnetic group 221 is a first magnet 2211 with an integral plate-like structure, the third magnetic group 223 can be set as a third magnet 2231 with an integral plate-like structure, and the shape structure of the first magnet 2211 is similar to the shape structure of the third magnet 2231. Of course, in other embodiments, when the first magnetic group 221 is a first magnet 2211 with an integral plate-like structure, the third magnetic group 223 can also be provided with a plurality of third magnets 2231, and vice versa, which is not limited here.

[0111] The sound-generating device 100 of the present invention is provided by configuring the magnetic circuit system 2 as a magnetic yoke 21 and a central magnetic portion 22 and a side magnetic portion 23 provided on the magnetic yoke, so that the side magnetic portion 23 is located outside the central magnetic portion 22 and is spaced from the central magnetic portion 22 to form a magnetic gap 24, and the voice coil 32 of the vibration system 3 is provided corresponding to the magnetic gap 24, so that when current is passed through the voice coil 32, the voice coil 32 vibrates in the magnetic field formed by the magnetic circuit system 2 and drives the diaphragm 31 to vibrate and generate sound; at the same time, by configuring the central magnetic portion 22 as a first magnetic group 221, a second magnetic group 222 and a third magnetic group 223 stacked on the magnetic yoke 21, the first magnetic group 221 and the third magnetic group 223 are magnetized along a vibration direction perpendicular to the vibration direction of the vibration system 3 (that is, along the horizontal direction). direction), and the second magnetic group 222 is magnetized along the vibration direction of the vibration system 3 (that is, magnetized in the vertical direction), that is, the magnetizing direction of the second magnetic group 222 is perpendicular to the magnetizing directions of the first magnetic group 221 and the third magnetic group 223, so that the central magnetic part 22 forms a Halbach magnetic circuit. In this way, the Halbach magnetic circuit formed by the central magnetic part 22 can effectively improve the magnetic field strength, increase the density of the magnetic flux of the magnetic gap 24, increase the number of magnetic lines of force passing through the voice coil 32, increase the magnetic field force on the voice coil 32, effectively improve the BL value, improve the sensitivity of the sound-generating device 100, effectively improve the flatness of the BL curve, significantly improve the FR frequency response curve, and effectively reduce the harmonic distortion THD, so that the sound effect and performance of the whole machine are better improved.

[0112] In one embodiment, the first magnetic group 221 includes a plurality of first magnets 2211 , which are adjacently arranged and located between the second magnetic group 222 and the magnetic yoke 21 ; wherein the plurality of first magnets 2211 are magnetized along a vibration direction perpendicular to the vibration system 3 .

[0113] In this embodiment, if Figure 3 , Figures 6 to 9 , Fig.11 As shown, by setting the first magnetic group 221 to a plurality of first magnets 2211, the plurality of first magnets 2211 are laid flat between the magnetic yoke 21 and the second magnetic group 222. Optionally, the plurality of first magnets 2211 are magnetized in the horizontal direction, that is, the plurality of first magnets 2211 are magnetized in the direction perpendicular to the movement of the voice coil 32, and the plurality of first magnets 2211 are magnetized from the periphery to the center, or from the center to the periphery, which is not limited here. Optionally, the magnetic poles of the plurality of first magnets 2211 close to the magnetic gap 24 are the same.

[0114] It can be understood that the first magnetic group 221 can be an integral first magnet 2211 of a square plate-like structure, which is arranged between the magnetic yoke 21 and the second magnetic group 222; or, the first magnetic group 221 includes a plurality of first magnets 2211, and the plurality of first magnets 2211 are adjacently and parallelly arranged between the second magnetic group 222 and the magnetic yoke 21, so that the plurality of first magnets 2211 cooperate to form a square plate-like structure, which is not limited here.

[0115] Optionally, the multiple first magnets 2211 of the first magnetic group 221 are magnetized in the horizontal direction, the magnetization directions of the multiple first magnets 2211 are perpendicular to the length extension direction of each first magnet 2211, and the polarities of the ends of the long sides of the multiple first magnets 2211 facing the magnetic gap 24 are all N poles or all S poles, which is not limited here.

[0116] In this embodiment, the voice coil 32 is in a rectangular ring shape, and has a long side 321 and a short side 322 connected end to end. Optionally, a plurality of first magnets 2211 are arranged adjacently and in parallel along the direction of the long side 321; or, a plurality of first magnets 2211 are arranged adjacently and in parallel along the direction of the short side 322; or, a portion of the first magnets 2211 are arranged adjacently and in parallel along the direction of the long side 321, and another portion of the first magnets 2211 are arranged at both ends of a portion of the first magnets 2211 along the direction of the short side 322, or vice versa, which is not limited here.

[0117] In one embodiment, the voice coil 32 is in a rectangular ring shape, and has a long side 321 and a short side 322 connected end to end; the first magnetic group 221 includes two first magnets 2211, and the two first magnets 2211 are adjacent to and arranged in parallel along the direction of the long side 321. The two first magnets 2211 are magnetized along the direction of the long side 321, and the magnetization directions of the two first magnets 2211 are opposite.

[0118] In this embodiment, if Figure 4 and Figure 8 As shown, by setting the first magnetic group 221 to two first magnets 2211, the two first magnets 2211 are laid flat between the second magnetic group 222 and the magnetic yoke 21 along the direction of the long side 321. Optionally, the two first magnets 2211 are magnetized in the horizontal direction, and the magnetization directions of the two first magnets 2211 are opposite.

[0119] Optionally, the two first magnets 2211 are arranged adjacent to and in parallel along the direction of the long side 321. The two first magnets 2211 are magnetized from the magnetic gap 24 in the direction of the sides where the two first magnets 2211 abut against each other; or, the two first magnets 2211 are magnetized from the sides where the two first magnets 2211 abut against each other in the direction of the magnetic gap 24, which is not limited here. In this embodiment, the magnetic poles of the two first magnets 2211 facing the magnetic gap 24 are the same.

[0120] It can be understood that the first magnetic group 221 can be an integral first magnet 2211 of a square plate-like structure, and is arranged between the second magnetic group 222 and the magnetic yoke 21; or, the first magnetic group 221 includes a plurality of first magnets 2211, and the plurality of first magnets 2211 are adjacent to and arranged in parallel between the second magnetic group 222 and the magnetic yoke 21 along the direction of the long side 321, so that the plurality of first magnets 2211 cooperate to form a square plate-like structure, which is not limited here.

[0121] Optionally, the multiple first magnets 2211 of the first magnetic group 221 are magnetized in the horizontal direction, the magnetization directions of the multiple first magnets 2211 are perpendicular to the length extension direction of each first magnet 2211, and the polarities of the ends of the long sides of the multiple first magnets 2211 facing the magnetic gap 24 are all N poles or all S poles, which is not limited here.

[0122] In one embodiment, the voice coil 32 is in a rectangular ring shape, and has a long side 321 and a short side 322 connected end to end. The first magnetic group 221 includes two first magnets 2211, and the two first magnets 2211 are adjacent to and arranged in parallel along the direction of the short side 322. The two first magnets 2211 are magnetized along the direction of the short side 322, and the magnetization directions of the two first magnets 2211 are opposite.

[0123] In this embodiment, if Figure 4 and Fig. 9 As shown, by setting the first magnetic group 221 to two first magnets 2211, the two first magnets 2211 are laid flat between the second magnetic group 222 and the magnetic yoke 21 along the direction of the short side 322. Optionally, the two first magnets 2211 are magnetized in the horizontal direction, and the magnetization directions of the two first magnets 2211 are opposite.

[0124] Optionally, the two first magnets 2211 are arranged adjacent to and in parallel along the direction of the short side 322. The two first magnets 2211 are magnetized from the magnetic gap 24 in the direction of the sides where the two first magnets 2211 abut against each other; or, the two first magnets 2211 are magnetized from the sides where the two first magnets 2211 abut against each other in the direction of the magnetic gap 24, which is not limited here. In this embodiment, the magnetic poles of the two first magnets 2211 facing the magnetic gap 24 are the same.

[0125] It can be understood that the first magnetic group 221 can be an integral first magnet 2211 of a square plate-like structure, and is arranged between the second magnetic group 222 and the magnetic yoke 21; or, the first magnetic group 221 includes a plurality of first magnets 2211, and the plurality of first magnets 2211 are adjacent to and arranged in parallel between the second magnetic group 222 and the magnetic yoke 21 along the direction of the short side 322, so that the plurality of first magnets 2211 cooperate to form a square plate-like structure, which is not limited here.

[0126] Optionally, the multiple first magnets 2211 of the first magnetic group 221 are magnetized in the horizontal direction, the magnetization directions of the multiple first magnets 2211 are perpendicular to the length extension direction of each first magnet 2211, and the polarities of the ends of the long sides of the multiple first magnets 2211 facing the magnetic gap 24 are all N poles or all S poles, which is not limited here.

[0127] In one embodiment, the voice coil 32 is in a rectangular ring shape, and the voice coil 32 has a long side 321 and a short side 322 connected end to end. The first magnetic group 221 includes four first magnets 2211, two first magnets 2211 are adjacent and arranged in parallel along the direction of the short side 322, and the other two first magnets 2211 are arranged at both ends of the two first magnets 2211 along the direction of the long side 321. The four first magnets 2211 are magnetized along the direction of the short side 322 and the direction of the long side 321, respectively. The magnetization directions of the two first magnets 2211 arranged along the short side 322 are opposite, and the magnetization directions of the other two first magnets 2211 arranged along the long side 321 are opposite.

[0128] In this embodiment, the polarities of the ends of the four first magnets 2211 facing the magnetic gap 24 are all N poles or all S poles. Figure 4 , Figure 6 and Figure 7 As shown, the four first magnets 2211 of the first magnetic group 221 are laid flat between the second magnetic group 222 and the magnetic yoke 21, and two of the four first magnets 2211 are adjacent and arranged in parallel along the direction of the short side 322, and the other two of the four first magnets 2211 are arranged at both ends of the two first magnets 2211 along the direction of the long side 321.

[0129] Optionally, the four first magnets 2211 are all magnetized in the horizontal direction, the magnetization directions of two first magnets 2211 arranged along the short side 322 of the four first magnets 2211 are opposite, the magnetization directions of the other two first magnets 2211 arranged along the long side 321 of the four first magnets 2211 are opposite, and the magnetization directions of the four first magnets 2211 are perpendicular to their respective length extension directions, and the polarities of the ends of the four first magnets 2211 facing the magnetic gap 24 are all N poles or all S poles, which are not limited here.

[0130] In this embodiment, the first magnet 2211 of the first magnetic group 221 can be an integral square bar or plate structure; or, the first magnet 2211 includes multiple first magnets 2211, and the multiple first magnets 2211 are adjacent to each other along the long side 321 and the short side 322 and are arranged in parallel between the second magnetic group 222 and the magnetic yoke 21, so that the multiple first magnets 2211 cooperate to form a square bar or plate structure, which is not limited here.

[0131] In one embodiment, the voice coil 32 is in a rectangular ring shape, and the voice coil 32 has a long side 321 and a short side 322 connected end to end. The first magnetic group 221 is divided along two diagonal lines to form four first magnets 2211, two first magnets 2211 are arranged in parallel along the direction of the short side 322, and the other two first magnets 2211 are arranged in parallel along the direction of the long side 321. The four first magnets 2211 are magnetized along the direction of the short side 322 and the direction of the long side 321, respectively. The magnetization directions of the two first magnets 2211 arranged along the short side 322 are opposite, and the magnetization directions of the other two first magnets 2211 arranged along the long side 321 are opposite.

[0132] In this embodiment, if Fig.11 As shown, the upper and lower surfaces of the first magnetic group 221 are generally rectangular, and the first magnetic group 221 is divided along two diagonal lines to form four first magnets 2211. The four first magnets 2211 can be formed by cutting a first magnetic group 221, or can be formed by assembling a split structure to form the first magnetic group 221. Optionally, two first magnets 2211 are arranged in parallel along the direction of the short side 322, and the other two first magnets 2211 are arranged in parallel along the direction of the long side 321. The four first magnets 2211 are magnetized in the direction of the short side 322 and the direction of the long side 321, respectively. The magnetization directions of the two first magnets 2211 are opposite, and the magnetization directions of the other two first magnets 2211 are opposite.

[0133] Optionally, the end polarities of the four first magnets 2211 facing the magnetic gap 24 are all N poles or all S poles. The four first magnets 2211 of the first magnetic group 221 are laid horizontally and located between the second magnetic group 222 and the magnetic yoke 21. Optionally, two of the four first magnets 2211 are symmetrically arranged at the intersection of the two diagonals of the first magnetic group 221, and the other two first magnets 2211 are symmetrically arranged at the intersection of the two diagonals of the first magnetic group 221.

[0134] It can be understood that the four first magnets 2211 are arranged in a triangle shape, so that the vertex angles of the four first magnets 2211 coincide with the intersection of the two diagonals of the first magnetic group 221 .

[0135] Optionally, the four first magnets 2211 are all magnetized in the horizontal direction, the magnetization directions of two of the first magnets 2211 are opposite, the magnetization directions of the other two first magnets 2211 are opposite, and the magnetization directions of the four first magnets 2211 are all perpendicular to the direction of the bottom edge opposite to the intersection of the two diagonals of the first magnetic group 221, and the end polarities of the four first magnets 2211 facing the magnetic gap 24 are all N poles or all S poles, which are not limited here.

[0136] In one embodiment, the second magnetic group 222 includes an integral plate-shaped second magnet 2221. It can be understood that such a configuration not only facilitates the processing of the second magnet 2221, but also facilitates assembly and magnetization, and effectively improves production and assembly efficiency.

[0137] In one embodiment, the second magnetic group 222 includes a plurality of second magnets 2221, which are arranged adjacent to each other and located between the first magnetic group 221 and the third magnetic group 223; wherein the plurality of second magnets 2221 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the plurality of second magnets 2221 are the same.

[0138] In this embodiment, if Figure 4 and Figure 6 As shown, by setting the second magnetic group 222 to a plurality of second magnets 2221, the plurality of second magnets 2221 are laid flat between the first magnetic group 221 and the third magnetic group 223. Optionally, the plurality of second magnets 2221 are magnetized in the vertical direction, and the magnetization directions of the plurality of second magnets 2221 are the same. That is, the plurality of second magnets 2221 are magnetized in the direction in which the voice coil 32 moves, and the plurality of second magnets 2221 are magnetized upward or downward at the same time, which is not limited here. Optionally, the magnetic poles of the plurality of second magnets 2221 close to the first magnetic group 221 are the same.

[0139] It can be understood that the second magnetic group 222 can be an integral second magnet 2221 of a square plate-like structure, which is arranged between the first magnetic group 221 and the third magnetic group 223; or, the second magnetic group 222 includes a plurality of second magnets 2221, and the plurality of second magnets 2221 are adjacently and parallelly arranged between the first magnetic group 221 and the third magnetic group 223, so that the plurality of second magnets 2221 cooperate to form a square plate-like structure, which is not limited here.

[0140] In this embodiment, the voice coil 32 is in a rectangular ring shape, and has a long side 321 and a short side 322 connected end to end. Optionally, a plurality of second magnets 2221 are arranged adjacently and in parallel along the direction of the long side 321; or, a plurality of second magnets 2221 are arranged adjacently and in parallel along the direction of the short side 322; or, a portion of the second magnets 2221 are arranged adjacently and in parallel along the direction of the long side 321, and another portion of the second magnets 2221 are arranged at both ends of a portion of the second magnets 2221 along the direction of the short side 322, or vice versa, which is not limited here.

[0141] In one embodiment, the third magnetic group 223 includes a plurality of third magnets 2231 , which are adjacently arranged and located on a side of the second magnetic group 222 facing away from the first magnetic group 221 ; wherein the plurality of third magnets 2231 are magnetized along a vibration direction perpendicular to the vibration system 3 .

[0142] In this embodiment, if Figure 4 , Figure 5 , Figure 6 , Figures 8 to 9 , Fig.11 As shown, by setting the third magnetic group 223 to a plurality of third magnets 2231, the plurality of third magnets 2231 are laid flat on the side of the second magnetic group 222 facing away from the first magnetic group 221. Optionally, the plurality of third magnets 2231 are all magnetized in the horizontal direction, that is, the plurality of third magnets 2231 are all magnetized in the 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. Optionally, the magnetic poles of the plurality of third magnets 2231 close to the magnetic gap 24 are all the same.

[0143] 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 on the side of the second magnetic group 222 facing away from the first magnetic group 221; 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 on the side of the second magnetic group 222 facing away from the first magnetic group 221, so that the plurality of third magnets 2231 cooperate to form a square plate-like structure, which is not limited here.

[0144] 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 magnetic gap 24 are all N poles or all S poles, which is not limited here.

[0145] In this embodiment, the voice coil 32 is in a rectangular ring shape, and has a long side 321 and a short side 322 connected end to end. Optionally, a plurality of third magnets 2231 are arranged adjacently and in parallel along the direction of the long side 321; or, a plurality of third magnets 2231 are arranged adjacently and in parallel along the direction of the short side 322; or, a portion of the third magnets 2231 are arranged adjacently and in parallel along the direction of the long side 321, and another portion of the third magnets 2231 are arranged at both ends of a portion of the third magnets 2231 along the direction of the short side 322, or vice versa, which is not limited here.

[0146] In one embodiment, the voice coil 32 is in a rectangular ring shape, and has a long side 321 and a short side 322 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 long side 321. The two third magnets 2231 are magnetized along the direction of the long side 321, and the magnetization directions of the two third magnets 2231 are opposite.

[0147] In this embodiment, if Figure 4 and Figure 8As shown, by setting the third magnetic group 223 as two third magnets 2231, the two third magnets 2231 are laid flat on the side of the second magnetic group 222 facing away from the first magnetic group 221 along the direction of the long side 321. Optionally, the two third magnets 2231 are magnetized in the horizontal direction, and the magnetization directions of the two third magnets 2231 are opposite.

[0148] Optionally, the two third magnets 2231 are arranged adjacent to and in parallel along the direction of the long side 321. The two third magnets 2231 are magnetized from the magnetic gap 24 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 magnetic gap 24, which is not limited here. In this embodiment, the magnetic poles of the two third magnets 2231 facing the magnetic gap 24 are the same.

[0149] It can be understood that the third magnetic group 223 can be an integral third magnet 2231 of a square plate-like structure, and is arranged on the side of the second magnetic group 222 facing away from the first magnetic group 221; or, the third magnetic group 223 includes a plurality of third magnets 2231, and the plurality of third magnets 2231 are adjacent to each other along the direction of the long side 321 and are arranged in parallel on the side of the second magnetic group 222 facing away from the first magnetic group 221, so that the plurality of third magnets 2231 cooperate to form a square plate-like structure, which is not limited here.

[0150] 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 magnetic gap 24 are all N poles or all S poles, which is not limited here.

[0151] In one embodiment, the voice coil 32 is in a rectangular ring shape, and the voice coil 32 has a long side 321 and a short side 322 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 322. The two third magnets 2231 are magnetized along the direction of the short side 322, and the magnetization directions of the two third magnets 2231 are opposite.

[0152] In this embodiment, if Figure 4 and Fig. 9 As shown, by setting the third magnetic group 223 as two third magnets 2231, the two third magnets 2231 are laid flat on the side of the second magnetic group 222 facing away from the first magnetic group 221 along the direction of the short side 322. Optionally, the two third magnets 2231 are magnetized in the horizontal direction, and the magnetization directions of the two third magnets 2231 are opposite.

[0153] Optionally, the two third magnets 2231 are arranged adjacent to and in parallel along the direction of the short side 322. The two third magnets 2231 are magnetized from the magnetic gap 24 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 magnetic gap 24, which is not limited here. In this embodiment, the magnetic poles of the two third magnets 2231 facing the magnetic gap 24 are the same.

[0154] It can be understood that the third magnetic group 223 can be an integral third magnet 2231 of a square plate-like structure, and is arranged on the side of the second magnetic group 222 facing away from the first magnetic group 221; or, the third magnetic group 223 includes a plurality of third magnets 2231, and the plurality of third magnets 2231 are adjacent to each other along the direction of the short side 322 and are arranged in parallel on the side of the second magnetic group 222 facing away from the first magnetic group 221, so that the plurality of third magnets 2231 cooperate to form a square plate-like structure, which is not limited here.

[0155] 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 magnetic gap 24 are all N poles or all S poles, which is not limited here.

[0156] In one embodiment, the voice coil 32 is in a rectangular ring shape, and the voice coil 32 has a long side 321 and a short side 322 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 direction of the short side 322, and the other two third magnets 2231 are arranged at both ends of the two third magnets 2231 along the direction of the long side 321. The four third magnets 2231 are magnetized along the direction of the short side 322 and the direction of the long side 321, respectively. The magnetization directions of the two third magnets 2231 arranged along the short side 322 are opposite, and the magnetization directions of the other two third magnets 2231 arranged along the long side 321 are opposite.

[0157] In this embodiment, the polarities of the ends of the four third magnets 2231 facing the magnetic gap 24 are all N poles or all S poles. Figure 4 , Figure 5 and Figure 6 As shown, the four third magnets 2231 of the third magnetic group 223 are laid flat on the side of the second magnetic group 222 facing away from the first magnetic group 221, and two of the four third magnets 2231 are adjacent to and arranged in parallel along the direction of the short side 322, and the other two of the four third magnets 2231 are arranged at both ends of the two third magnets 2231 along the direction of the long side 321.

[0158] Optionally, the four third magnets 2231 are all magnetized in the horizontal direction, the magnetization directions of two of the four third magnets 2231 are opposite, the magnetization directions of the other two of the four third magnets 2231 are opposite, and the magnetization directions of the four third magnets 2231 are perpendicular to their respective length extension directions, and the polarities of the ends of the four third magnets 2231 facing the magnetic gap 24 are all N poles or all S poles, which are not limited here.

[0159] In this embodiment, the third magnet 2231 of the third magnetic group 223 can be an integral square bar or plate structure; or, the third magnet 2231 includes multiple third magnets 2231, and the multiple third magnets 2231 are adjacent to each other along the long side 321 and the short side 322 and are arranged in parallel on the side of the second magnetic group 222 facing away from the first magnetic group 221, so that the multiple third magnets 2231 cooperate to form a square bar or plate structure, which is 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 321 and a short side 322 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 direction of the short side 322, and the other two third magnets 2231 are arranged in parallel along the direction of the long side 321. The four third magnets 2231 are magnetized along the direction of the short side 322 and the direction of the long side 321, respectively. The magnetization directions of the two third magnets 2231 arranged along the short side 322 are opposite, and the magnetization directions of the other two third magnets 2231 arranged along the long side 321 are opposite.

[0161] In this embodiment, if Fig.11 As 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 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 322, and the other two third magnets 2231 are arranged in parallel along the direction of the long side 321. The four third magnets 2231 are magnetized in the direction of the short side 322 and the direction of the long side 321, respectively. The magnetization directions of the two third magnets 2231 are opposite, and the magnetization directions of the other two third magnets 2231 are opposite.

[0162] Optionally, the end polarities of the four third magnets 2231 facing the magnetic gap 24 are all N poles or all S poles. The four third magnets 2231 of the third magnetic group 223 are laid horizontally and are located on the side of the second magnetic group 222 facing away from the first magnetic group 221. Optionally, two of the four third magnets 2231 are symmetrically arranged at the intersection of the two diagonals of the third magnetic group 223, and the other two third magnets 2231 are symmetrically arranged 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 two third magnets 2231 are opposite, the magnetization directions of the other two third magnets 2231 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 end polarities of the four third magnets 2231 facing the magnetic gap 24 are all N poles or all S poles, which are not limited here.

[0165] In one embodiment, the edge magnetic portion 23 includes a stacked edge magnet 231 and a edge magnetic conductive plate 232, and the edge magnet 231 is connected to the magnetic conductive yoke 21; the second magnetic group 222 and the edge magnet 231 are magnetized along the vibration direction of the vibration system 3, and the magnetization direction of the second magnetic group 222 is opposite to the magnetization direction of the edge magnet 231 of the edge magnetic portion 23.

[0166] In this embodiment, if Figures 2 to 5 As shown, the side magnet 231 and the side magnetic conductive plate 232 of the side magnetic part 23 are stacked on the magnetic conductive yoke 21, and the side magnet 231 is connected to the magnetic conductive yoke 21. The side magnet 231 and the side magnetic conductive plate 232 of the side magnetic part 23 are located outside the central magnetic part 22 and are spaced to form a magnetic gap 24. 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 second magnetic group 222 close to the third magnetic group 223.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] In this embodiment, the side magnets 231 of the side magnet portion 23 and the second magnetic group 222 of the central magnetic portion 22 are magnetized in the vertical direction, that is, they are magnetized in the moving direction of the voice coil 32. Optionally, the magnetization direction of the second magnetic group 222 is opposite to the magnetization direction of the side magnets 231 of the side magnet portion 23.

[0171] It can be understood that when the second magnetic group 222 is magnetized from bottom to top, the side magnet 231 is magnetized from top to bottom, that is, when the N pole of the second magnetic group 222 is at the top and the S pole is at the bottom, the N pole of the side magnet 231 is at the bottom and the S pole is at the top; or, when the second magnetic group 222 is magnetized from top to bottom, the side magnet 231 is magnetized from bottom to top, that is, when the N pole of the second magnetic group 222 is at the bottom and the S pole is at the top, the N pole of the side magnet 231 is at the top and the S pole is at the bottom, which is not limited here.

[0172] In one embodiment, the sound generating device 100 further includes a housing 1 , 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 .

[0173] In this embodiment, 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.

[0174] 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.

[0175] 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 .

[0176] In this embodiment, the diaphragm 31 includes an inner ring portion 311, a first fold ring 313 disposed around the inner ring portion 311, a straight portion 314 disposed around the first fold ring 313, a second fold ring 315 disposed around the straight portion 314, and a fixing portion 316 connected to the outer side of the second fold ring 315, the fixing portion 316 is connected to the housing 1, and one end of the voice coil 32 is directly or indirectly connected to the straight portion 314. 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.

[0177] In order to strengthen the structural strength of the central part of the diaphragm 31, the vibration system 3 also includes a vibration plate, which is arranged in the central part of the diaphragm 31. It is understandable that in order to reduce the weight of the vibration system 3, the central part of the diaphragm 31 is provided with a hollow hole, and the vibration plate is connected to the central part and covers the hollow hole. Optionally, a step surface is formed on the periphery of the vibration plate, and one side of the diaphragm 31 adjacent to the hollow hole is supported and connected to the step surface, and the step surface is located between the voice coil 32 and the diaphragm 31. It is understandable that by providing a step surface on the periphery of the vibration plate, the step surface is recessed toward one side of the voice coil 32, thereby ensuring that when the central part of the diaphragm 31 is overlapped and supported on the step surface of the vibration plate, the upper surface of the central part of the diaphragm 31 is flush with the upper surface of the vibration plate, thereby making the assembly structure more compact and ensuring the vibration performance of the entire diaphragm 31.

[0178] 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 .

[0179] 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.

[0180] 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, and the centering support plate 34 includes an external fixing portion 341, an internal fixing portion 342 and an elastic wall 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] Optionally, multiple centering supports 34 are correspondingly distributed along the long axis direction of the magnetic circuit system 2; and / or, multiple centering supports 34 are correspondingly distributed along the short axis direction of the magnetic circuit system 2; and / or, multiple centering supports 34 are correspondingly distributed along 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.

[0185] 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 .

[0186] 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.

[0187] In one embodiment, each centering support plate 34 includes an outer fixing portion 341, an elastic wall portion 343 and an inner fixing portion 342 which are connected in sequence. The outer fixing portion 341 is connected to the outer shell 1, and the inner fixing portion 342 is connected to the connecting portion 332. The inner fixing portion 342 is provided with an inner solder pad, and the lead of the voice coil 32 extends along the connecting portion 332 to the inner solder pad.

[0188] In this embodiment, if Figure 2 , Figure 3 , Figure 5 As shown, the outer fixing portion 341, the elastic wall 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. It can be understood that in order to ensure the deformation ability of the centering support 34, the elastic wall portion 343 has at least one bend.

[0189] 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.

[0190] In one embodiment, if Figure 2 , Figure 3 and Figure 5 As shown, the outer fixing portion 341, the elastic wall 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.

[0191] 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 in the shape of a straight plate and is in contact with the third magnetic group 223; or, the inner ring portion 311 is formed with an inner ring hole 312.

[0192] 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 .

[0193] 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.

[0194] 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.

[0195] 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 the inner ring portion 311 is connected and fitted to the side of the third magnetic group 223 facing away from the second magnetic group 222. 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 part of the third magnetic group 223 is arranged corresponding to the inner ring hole 312.

[0196] 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.

[0197] In one embodiment, if Figures 2 to 4 As 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.

[0198] In one embodiment, at least a portion of the side of the third magnetic group 223 facing away from the second magnetic group 222 is protruded toward a side facing away from the second magnetic group 222 to form a protrusion.

[0199] In this embodiment, if Figure 3 , Figure 4 and Figure 6 As shown, the third magnetic group 223 includes a central portion and an edge portion, the edge portion is arranged around the periphery of the central portion, and the central portion is protruding on one side of the side facing away from the second magnetic group 222, and the edge portion is protruding on one side of the side facing away from the second magnetic group 222. Optionally, the central portion and the edge portion of the third magnetic group 223 are an integrally formed structure. Of course, in other embodiments, the central portion and the edge portion of the third magnetic group 223 can also be set as a split structure, which is not limited here.

[0200] Optionally, the thickness of the center portion along the moving direction of the voice coil 32 is optionally greater than the thickness of the edge portion along the moving direction of the voice coil 32. That is, the side surface of the center portion facing away from the second magnetic group 222 protrudes beyond the side surface of the edge portion facing away from the second magnetic group 222 to form a protrusion.

[0201] It can be understood that the vibration system 3 is provided with a through structure for the protrusion to pass through. When the sound-generating device 100 is applied to an electronic device, in order to reduce the Z-direction height of the electronic device, the protrusion of the central magnetic part 22 in the sound-generating device 100 can be used to abut against the inner wall of the shell of the electronic device. There is no need to increase the front cavity space additionally. The front sound cavity structure can be formed by utilizing the height difference between the protrusion of the central magnetic part 22 and the vibration system 3. No limitation is made here.

[0202] Of course, in other implementations, the thickness of the center portion along the moving direction of the voice coil 32 may be the same as the thickness of the edge portion along the moving direction of the voice coil 32. The diaphragm 31 of the vibration system 3 is disposed opposite to and spaced from the central magnetic portion 22, which is not limited here.

[0203] In this embodiment, the protruding portion of the third magnetic group 223 is protruding from 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 .

[0204] In one embodiment, the third magnetic group 223 includes a central portion and an edge portion, the edge portion is arranged around the outer periphery of the central portion, the central portion protrudes on the side facing away from the second magnetic group 222, and the edge portion faces away from the side of the second magnetic group 222 to form a protrusion; the edge portion forms a closed, integrated annular structure; or, the edge portion includes a plurality of adjacent edge portions connected end to end to form a closed annular structure; or, the edge portion includes a plurality of adjacent edge portions spaced apart to form an annular structure with a gap; or, the edge portion and the central portion are an integrally formed structure.

[0205] In this embodiment, if Figure 3 and Figure 6 As shown, the edge portion of the third magnetic group 223 includes a plurality of edge portions, and the plurality of edge portions are arranged around the periphery of the central portion. Optionally, adjacent edge portions are connected end to end to form a closed annular structure; or, adjacent edge portions are spaced to form an annular structure with a gap. Of course, the edge portion can also form a closed integral annular structure arranged around the periphery of the central portion, which is not limited here.

[0206] It can be understood that, in order to facilitate processing and organization, the edge portion and the center portion of the third magnetic group 223 can be selected as an integrally formed structure.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] It is understandable that the electronic device can be a headset, a mobile phone, a computer, a tablet computer, a smart wearable device, etc., which is 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 monomer. The electronic device can be a mobile phone, an MP3, an MP4, a tablet computer, a headset, a wearable device, etc., which are not listed one by one here.

[0212] 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 and a third magnetic group arranged in a stacked manner, the first magnetic group being connected to the magnetic yoke; A vibration system, the vibration system comprising a diaphragm and a voice coil connected to the diaphragm, the voice coil being arranged corresponding to the magnetic gap; Among them, the first magnetic group and the third magnetic group are both magnetized along a vibration direction perpendicular to the vibration system, and the second magnetic group is magnetized along the vibration direction of the vibration system, so that the central magnetic part forms a Halbach magnetic circuit, the magnetization direction of the first magnetic group is opposite to the magnetization direction of the third magnetic group, the magnetic pole on the inner side of the first magnetic group close to its center is the same as the magnetic pole on the side of the second magnetic group away from the first magnetic group, and the magnetic pole on the inner side of the first magnetic group close to its center is opposite to the magnetic pole on the inner side of the third magnetic group close to its center.

2. 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°.

3. The sound generating device according to claim 1, characterized in that: A projection of at least part of the third magnetic group along a vibration direction perpendicular to the vibration system coincides with a projection of the voice coil along a vibration direction perpendicular to the vibration system.

4. The sound generating device according to claim 1, characterized in that: The magnetization direction of the first magnetic group is from the periphery of the first magnetic group to the center of the first magnetic group, and the magnetization direction of the third magnetic group is from the center of the third magnetic group to the periphery of the third magnetic group; Alternatively, the first 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, the magnetization direction of the first magnetic group is along the first axis and / or the second axis, and the magnetization direction of the third magnetic group is along the second axis and / or the first axis.

5. The sound generating device according to claim 4, characterized in that: The first magnetic group includes a first magnet of an integral plate-shaped structure, and a first through hole is opened at the center of the first magnet of the plate-shaped structure; The third magnetic group includes a third magnet with an integral plate-shaped structure, and a second through hole is opened at the center of the third magnet with the plate-shaped structure.

6. The sound generating device according to claim 1, 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 first magnetic group includes two first magnets, the two first magnets are adjacent to each other and arranged in parallel along the direction of the long side, the two first magnets are magnetized along the direction of the long side, and the magnetization directions of the two first magnets are opposite; Or, the first magnetic group includes two first magnets, the two first magnets are adjacent to each other and arranged in parallel along the direction of the short side, the two first magnets are magnetized along the direction of the short side, and the magnetization directions of the two first magnets are opposite; Or, the first magnetic group includes four first magnets, two of the first magnets are adjacent and arranged in parallel along the direction of the short side, and the other two first magnets are arranged at both ends of the two first magnets along the direction of the long side, and the four first magnets are magnetized along the direction of the short side and the direction of the long side respectively, the two first magnets arranged along the short side have opposite magnetization directions, and the other two first magnets arranged along the long side have opposite magnetization directions; Alternatively, the first magnetic group is divided along two diagonal lines to form four first magnets, two of the first magnets are arranged in parallel along the direction of the short side, and the other two of the first magnets are arranged in parallel along the direction of the long side, and the four first magnets are magnetized along the direction of the short side and the direction of the long side, respectively, the two first magnets arranged along the short side have opposite magnetization directions, and the other two first magnets arranged along the long side have opposite magnetization directions.

7. The sound generating device according to claim 1, characterized in that: The second magnetic group includes a second magnet with an integral plate-like structure; Or, the second magnetic group includes a plurality of second magnets, and the plurality of second magnets are arranged adjacent to each other and located between the first magnetic group and the third magnetic group; wherein the plurality of second magnets are magnetized along the vibration direction of the vibration system, and the magnetization directions of the plurality of second magnets are the same.

8. The sound generating device according to claim 1, 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.

9. The sound generating device according to any one of claims 1 to 8, 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; The second magnetic group and the side magnets are both magnetized along the vibration direction of the vibration system, and the magnetization direction of the second magnetic group is opposite to the magnetization direction of the side magnets of the side magnet portion.

10. The sound generating device according to claim 9, characterized in that: The sound-generating device further comprises a shell, one end of which is connected to the edge magnetic conductive plate, and the other end of which is connected to the periphery of the diaphragm.

11. The sound generating device according to claim 10, characterized in that: The side magnetic conductive plate and the shell are an integrally formed structure; And / or, the diaphragm is annular, the inner periphery of the diaphragm is fixed to the magnetic circuit system, one end of the voice coil is connected to the diaphragm, and the other end of the voice coil is suspended in the magnetic gap.

12. The sound generating device according to claim 10, characterized in that: The vibration system further comprises a frame, and the voice coil is connected to the diaphragm via the frame.

13. The sound generating device according to claim 12, characterized in that: The skeleton comprises a main body and a connecting portion connected to the periphery of the main body, wherein the main body is 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 wall 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.

14. The sound generating device according to claim 10, 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 in the shape of a straight plate and is in contact with the third magnetic group; or, the inner ring portion is formed with an inner ring hole.

15. The sound generating device according to claim 14, 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.

16. An electronic device, characterized in that: The electronic device comprises the sound emitting device according to any one of claims 1 to 15.

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