Sound production device and electronic equipment

Abstract

The utility model discloses a sounding device and an electronic device, and relates to the technical field of electroacoustic transduction, the sounding device comprises a magnetic circuit system and a vibration system, a central magnetic part of the magnetic circuit system comprises a first central magnet, a second central magnet and a third central magnet which are laminated; the first center magnet and the third center magnet are magnetized in the vibration direction of the vibration system, and the magnetizing direction of the second center magnet is perpendicular to the magnetizing direction of the first center magnet and the magnetizing direction of the third center magnet. The magnetic poles of the ends away from each other of the first center magnet and the third center magnet are opposite to the magnetic pole of the second center magnet close to the magnetic gap. According to the sound production device, the magnetic circuit system is optimized, so that the BL value is increased, the flatness of a BL curve is effectively improved, the FR frequency response curve is obviously improved, the harmonic distortion THD is effectively reduced, and the tone quality and the performance of the whole machine are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electroacoustic transducer, 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. Utility Model Content

[0004] The main purpose of the utility model 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 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] In order to achieve the above-mentioned purpose, the utility model provides a sound-generating device, which comprises:

[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 central magnet, a second central magnet and a third central magnet arranged in a stacked manner;

[0007] A vibration system, the vibration system comprising a diaphragm and a voice coil connected to the diaphragm, the diaphragm is arranged around the magnetic circuit system, the voice coil is arranged in the magnetic gap and connected to the diaphragm through a frame;

[0008] Wherein, the first central magnet and the third central magnet are both magnetized along the vibration direction of the vibration system, the magnetization direction of the second central magnet is perpendicular to the magnetization directions of the first central magnet and the third central magnet, and the magnetic poles at one end of the first central magnet and the third central magnet that are away from each other are opposite to the magnetic poles at the side of the second central magnet close to the magnetic gap.

[0009] In one embodiment, the side magnet portion includes a first side magnet, an intermediate piece, and a second side magnet that are stacked, and the first side magnet, the intermediate piece, and the second side magnet correspond to the first center magnet, the second center magnet, and the third center magnet in a one-to-one manner in a vibration direction perpendicular to the vibration system.

[0010] The first side magnet and the second side magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles at the ends away from each other are the same as the magnetic poles at the side of the second center magnet close to the magnetic gap.

[0011] In one embodiment, the intermediate member is a third side magnet, the magnetization direction of the third side magnet is perpendicular to the magnetization direction of the first center magnet, and the magnetic pole of the third side magnet close to the magnetic gap is opposite to the magnetic pole of the second center magnet close to the magnetic gap;

[0012] Alternatively, the intermediate piece is an edge magnetic conductive plate.

[0013] In one embodiment, at least a portion of the projection of the second central magnet along a vibration direction perpendicular to the vibration system coincides with the projection of the voice coil along a vibration direction perpendicular to the vibration system;

[0014] And / or, a projection of at least part of the intermediate member 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.

[0015] In one embodiment, the sound-generating device further comprises a housing, the housing is provided with an installation cavity, and the magnetic circuit system and the vibration system are arranged in the installation cavity.

[0016] In one embodiment, the magnetically conductive yoke includes a first magnetic yoke and a second magnetic yoke arranged opposite to each other, the central magnetic portion and the side magnetic portion are arranged between the first magnetic yoke and the second magnetic yoke, the first central magnet is connected to the first magnetic yoke, and the third central magnet is connected to the second magnetic yoke.

[0017] In one embodiment, the housing further comprises a first through hole and a second through hole communicating with the mounting cavity, the first magnetic yoke is connected to the housing and located in the first through hole, and the second magnetic yoke is connected to the housing and located in the second through hole.

[0018] In one embodiment, the vibration system further includes a frame, the edge magnet portion is provided with an escape gap connected to the magnetic gap, one end of the frame is connected to the diaphragm, and the other end of the frame passes through the escape gap and is connected to the voice coil.

[0019] 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 outer shell, the straight portion is connected to the frame, the inner ring portion is formed with an inner ring hole, and the magnetic circuit system is passed through the inner ring hole.

[0020] 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;

[0021] And / or, the protruding direction of the first fold ring is the same as or opposite to the protruding direction of the second fold ring;

[0022] And / or, the diaphragm further comprises a reinforcement portion, wherein the reinforcement portion is disposed between the straight portion and the frame;

[0023] And / or, the housing is further provided with a support member, the support member is a ring-shaped structure, the support member is provided on a side of the diaphragm away from the frame, and the inner ring portion is connected to the support member.

[0024] The utility model also provides an electronic device, which includes the sound-generating device mentioned above.

[0025] The sound-generating device of the technical solution of the utility model 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 central magnet, a second central magnet and a third central magnet arranged in a stacked manner, the first central magnet and the third central magnet are both magnetized along the vibration direction of the vibration system, and the second central magnet is magnetized along the vibration direction of the vibration system. The magnetizing direction of the center magnet is arranged perpendicularly to the magnetizing direction of the first center magnet and the third center magnet. The magnetic poles at the ends of the first center magnet and the third center magnet that are far away from each other are opposite to the magnetic poles at the side of the second center magnet close to the magnetic gap, which effectively improves the magnetic field strength of the magnetic gap, increases the density of the magnetic flux in the magnetic gap, increases the number of magnetic lines of force passing through the voice coil, increases the magnetic field force on the voice coil, effectively improves the BL value, improves the sensitivity of the sound-generating device, 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 effect and performance of the whole machine are better improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 A structural schematic diagram of an embodiment of a sound-generating device provided by the utility model;

[0028] Figure 2 A structural schematic diagram of another perspective of an embodiment of a sound-generating device provided by the utility model;

[0029] Figure 3 An exploded schematic diagram of an embodiment of a sound-generating device provided by the utility model;

[0030] Figure 4 A cross-sectional schematic diagram of an embodiment of a sound-generating device provided by the utility model;

[0031] Figure 5 A comparison chart of the BL curves of the sound-generating device provided by the utility model and the prior art;

[0032] Figure 6 This is a comparison chart of the FR curves of the sound-generating device provided by the utility model and the prior art.

[0033] Description of Figure Numbers:

[0034] 100. Sounding device; 1. Housing; 11. Mounting cavity; 12. First through hole; 13. Second through hole; 14. Support member; 15. First shell; 16. Second shell; 2. Magnetic circuit system; 21. Magnetic yoke; 211. First magnetic yoke; 212. Second magnetic yoke; 22. Central magnetic part; 221. First central magnet; 222. Second central magnet; 223. Third central magnet; 23. Side magnetic part ; 231, first side magnet; 232, middle piece; 233, second side magnet; 234, avoidance gap; 24, magnetic gap; 3, vibration system; 31, diaphragm; 311, inner ring; 312, inner ring hole; 313, first fold ring; 314, straight part; 315, second fold ring; 316, fixed part; 317, reinforcement part; 32, voice coil; 321, long side; 322, short side; 33, skeleton.

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) 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.

[0038] 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.

[0039] In addition, in the present utility model, 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 utility model.

[0040] 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.

[0041] 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.

[0042] Based on the above ideas and problems, the present invention proposes a sound device 100. It can be understood that the sound 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.

[0043] Please refer to Figures 1 to 4As shown, in the embodiment of the utility model, 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 central magnet 221, a second central magnet 222 and a third central magnet 223 arranged in a stacked manner, 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 central magnet 221 and the third central magnet 223 are both magnetized along the vibration direction of the vibration system 3, the magnetization direction of the second central magnet 222 is arranged perpendicular to the magnetization direction of the first central magnet 221 and the third central magnet 223, and the magnetic poles of the ends of the first central magnet 221 and the third central magnet 223 that are away from each other are opposite to the magnetic poles of the second central magnet 222 that are close to the magnetic gap 24.

[0044] 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.

[0045] It should be noted that the magnetic circuit system 2 of the sound-generating device 100 and the diaphragm 31 of the vibration system 3 are arranged opposite to each other. Of course, in other embodiments, the diaphragm 31 of the vibration system 3 can also be arranged on the periphery of the magnetic circuit system 2, which is not limited here.

[0046] 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 in a square structure. 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 mounted on a housing or a module housing, etc., which is not limited here.

[0047] 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 4 As shown, the sound-generating device 100 further includes a housing 1 , and a magnetic circuit system 2 and a vibration system 3 are accommodated in the housing 1 .

[0048] 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 can be formed by the cooperation of multiple split structures, which is not limited here.

[0049] Optionally, the shell 1 can be selected as a frame or frame structure, that is, the shell 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 shell 1, so that the magnetic circuit system 2, the shell 1 and the vibration membrane 31 of the vibration system 3 enclose a vibration cavity.

[0050] Optionally, the housing 1 may be a BOX structure, that is, the housing 1 has an installation cavity 11, and the magnetic circuit system 2 and the vibration system 3 are both arranged in the installation cavity 11. It can be understood that the periphery of the diaphragm 31 of the vibration system 3 is arranged around the magnetic circuit system 2, and the center of the diaphragm 31 is provided with a through hole structure for the magnetic circuit system 2 to pass through. At this time, the inner edge of the diaphragm 31 is connected to the edge magnetic part 23 of the magnetic circuit system 2 or the support 14 on the housing 1, and the diaphragm 31 and the voice coil 32 are fixed by the skeleton 33.

[0051] 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.

[0052] 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.

[0053] It can be understood that 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 21, the magnetic circuit system 2 can be connected to the housing 1 through the magnetic yoke 21; or, the magnetic circuit system 2 can be connected to the housing 1 through the side magnetic portion 23, which is not limited here. In this embodiment, the side magnetic portion 23 is located outside the central magnetic portion 22 and is enclosed with the central magnetic portion 22 to form a magnetic gap 24, so that the diaphragm 31 of the vibration system 3 is connected to the housing 1, 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 correspondingly arranged with the magnetic gap 24.

[0054] In order to realize the electrical connection between the voice coil 32 and the external circuit, in one embodiment, the vibration system 3 further comprises a centering support plate, one end of which is connected to the voice coil 32 and is connected to the lead wire of the voice coil 32, and the other end of which is connected to the housing 1.

[0055] It can be understood that, taking the centering support as an example, the two ends of the centering support are electrically connected to the lead wire of the voice coil 32 and the external circuit respectively. In this embodiment, the centering support can be arranged at the bottom of the voice coil 32, and the centering support 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 can also be arranged at the top of the voice coil 32, and the centering support is located between the voice coil 32 and the diaphragm 31, which is not limited here.

[0056] In this embodiment, by setting the central magnetic part 22 as the first central magnet 221, the second central magnet 222 and the third central magnet 223 which are stacked on the magnetic yoke 21, the first central magnet 221 and the third central magnet 223 of the central magnetic part 22 are magnetized along the vibration direction of the vibration system 3, the magnetization direction of the second central magnet 222 is perpendicular to the magnetization directions of the first central magnet 221 and the third central magnet 223, the magnetic poles at the ends of the first central magnet 221 and the third central magnet 223 which are away from each other are opposite to the magnetic poles at the side of the second central magnet 222 which is close to the magnetic gap 24, thereby increasing the density of the magnetic flux of the magnetic gap 24, increasing the number of magnetic lines of force passing through the voice coil 32, increasing the magnetic field force on the voice coil 32, effectively improving the BL value, improving the sensitivity of the sound-generating device 100, and effectively improving the flatness of the BL curve (such as Figure 5 As shown), the FR frequency response curve is significantly improved (as shown Figure 6 As shown in the figure, the harmonic distortion THD is effectively reduced, which improves the sound effect and performance of the whole machine.

[0057] It should be noted that Figure 5 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. Figure 6 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 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.

[0058] It should be noted that Figure 4 The direction of the arrow in the middle magnetic circuit system 2 is the direction from the S pole to the N pole, that is, the magnetization direction.

[0059] In this embodiment, the first center magnet 221, the second center magnet 222 and the third center magnet 223 of the center magnetic part 22 can be selected as permanent magnets. It can be understood that the first center magnet 221, the second center magnet 222 and the third center magnet 223 of the center magnetic part 22 are stacked along the moving direction of the voice coil 32, that is, the first center magnet 221 and / or the third center magnet 223 are connected to the magnetic yoke 21, the second center magnet 222 is stacked on the first center magnet 221 and the third center magnet 223, and the third center magnet 223 is stacked on the side of the second center magnet 222 facing away from the first center magnet 221.

[0060] Optionally, the magnetic circuit system 2 is arranged in a square shape, that is, the central magnetic part 22 is arranged in a square shape, and the side magnetic part 23 is an annular structure arranged in a square shape or a square annular structure with a gap.

[0061] In this embodiment, the first center magnet 221, the second center magnet 222 and the third center magnet 223 of the center magnetic part 22 may be selected as permanent magnets. It can be understood that the first center magnet 221, the second center magnet 222 and the third center magnet 223 of the center magnetic part 22 are stacked along the moving direction of the voice coil 32, that is, the first center magnet 221 is connected to the magnetic yoke 21, the second center magnet 222 is stacked between the first center magnet 221 and the third center magnet 223, and the third center magnet 223 is stacked on the side of the second center magnet 222 facing away from the first center magnet 221.

[0062] Optionally, the first central magnet 221 , the second central magnet 222 and the third central magnet 223 of the central magnetic portion 22 are in a square plate-like structure, which is not limited here.

[0063] In one embodiment, the magnetization direction of the first central magnet 221 is opposite to the magnetization direction of the third central magnet 223, and the magnetic poles of the ends of the first central magnet 221 and the third central magnet 223 that are away from each other are opposite to the magnetic poles of the second central magnet 222 that is close to the magnetic gap 24. Figure 4 As shown, when the first central magnet 221 is magnetized from top to bottom, the third central magnet 223 is magnetized from bottom to top, and the second central magnet 222 is magnetized from the center to the magnetic gap 24, that is, when the N pole of the first central magnet 221 is at the bottom and the S pole is at the top, the N pole of the third central magnet 223 is at the top and the S pole is at the bottom, and the magnetic pole of the second central magnet 222 facing the magnetic gap is the N pole; or, when the first central magnet 221 is magnetized from bottom to top, the third central magnet 223 is magnetized from top to bottom, that is, when the N pole of the first central magnet 221 is at the top and the S pole is at the bottom, the N pole of the third central magnet 223 is at the bottom and the S pole is at the top, and the magnetic pole of the second central magnet 222 facing the magnetic gap is the S pole.

[0064] It can be understood that the magnetization direction of the first center magnet 221 is opposite to the magnetization direction of the third center magnet 223, and the magnetic poles of the ends of the first center magnet 221 and the third center magnet 223 that are away from each other are opposite to the magnetic poles of the second center magnet 222 that is close to the magnetic gap 24. The magnetic field with a strong magnetic field strength generated by the central magnetic portion 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 lines of force passing through the voice coil 32, and increasing the magnetic field force on the voice coil 32, thereby effectively improving the BL value.

[0065] Optionally, the magnetization direction of the first center magnet 221 is opposite to the magnetization direction of the first side magnet 231. It is understandable that such an arrangement allows the center magnetic portion 22 and the side magnetic portion 23 to form a magnetic circuit passing through the voice coil 32 in the magnetic gap 24. Optionally, the magnetization direction of the third center magnet 223 is opposite to the magnetization direction of the second side magnet 233. It is understandable that such an arrangement allows the center magnetic portion 22 and the side magnetic portion 23 to form a magnetic circuit passing through the voice coil 32 in the magnetic gap 24.

[0066] In one embodiment, the side magnet portion 23 includes a first side magnet 231, an intermediate piece 232 and a second side magnet 233 which are stacked, and the first side magnet 231, the intermediate piece 232 and the second side magnet 233 correspond to the first center magnet 221, the second center magnet 222 and the third center magnet 223 in a vibration direction perpendicular to the vibration system 3, respectively; wherein the first side magnet 231 and the second side magnet 223 are magnetized along the vibration direction of the vibration system 3, and the magnetic poles at one end away from each other are the same as the magnetic poles at the side of the second center magnet 222 close to the magnetic gap 24.

[0067] In this embodiment, if Figure 3 to Figure 4 As shown, by setting the edge magnet part 23 to be a first edge magnet 231, an intermediate part 232 and a second edge magnet 233 which are stacked, the first edge magnet 231 and the second edge magnet 223 are magnetized along the vibration direction of the vibration system 3, so that the edge magnet part 23 forms a magnetic field with a higher magnetic field strength, increases the number of magnetic lines of force passing through the voice coil 32, increases the magnetic field force on the voice coil 32, effectively improves the BL value, improves the sensitivity of the sound-generating device 100, and effectively improves the flatness of the BL curve (such as Figure 5 As shown), the FR frequency response curve is significantly improved (as shown Figure 6 As shown in the figure, the harmonic distortion THD is effectively reduced, which improves the sound effect and performance of the whole machine.

[0068] Optionally, the vibration direction of the vibration system 3 in this embodiment can be selected as a vertical direction. In this embodiment, the side magnet portion 23 is configured as a first side magnet 231, an intermediate piece 232, and a second side magnet 233 stacked on the magnetic yoke 21, that is, the first side magnet 231, the intermediate piece 232, and the second side magnet 233 are stacked on the magnetic yoke 21 in the vertical direction. Optionally, the first side magnet 231 and the second side magnet 233 are magnetized in the vertical direction.

[0069] In one embodiment, the magnetization direction of the first side magnet 231 is opposite to the magnetization direction of the second side magnet 233. Figure 4 As shown, when the first side magnet 231 is magnetized from bottom to top, the second side magnet 233 is magnetized from top to bottom, that is, when the N pole of the first side magnet 231 is at the top and the S pole is at the bottom, the N pole of the second side magnet 233 is at the bottom and the S pole is at the top; or, when the first side magnet 231 is magnetized from top to bottom, the second side magnet 233 is magnetized from bottom to top, that is, when the N pole of the first side magnet 231 is at the bottom and the S pole is at the top, the N pole of the second side magnet 233 is at the top and the S pole is at the bottom, which is not limited here.

[0070] It can be understood that the magnetization direction of the first side magnet 231 is opposite to the magnetization direction of the second side magnet 233, so that the magnetic flux lines of the first side magnet 231 and the second side magnet 233 of the side magnet portion 23 are gathered on the middle piece 232, and the magnetic field with a stronger magnetic field strength generated by the side magnet portion 23 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, and increasing the magnetic field force on the voice coil 32, thereby effectively improving the BL value.

[0071] It should be noted that the middle piece 232 can be selected as a side magnetic plate or a third side magnet. When the middle piece 232 is a third side magnet, optionally, the magnetization direction of the third side magnet is the same as the magnetization direction of the second center magnet 222. It can be understood that such a configuration can make the center magnetic part 22 and the side magnetic part 23 form a magnetic circuit passing through the voice coil 32.

[0072] In one embodiment, the middle piece 232 can be selected as a side magnetic conductive plate, so that the stacked first side magnet 231, the middle piece 232 and the second side magnet 233 form a magnetic structure, so that the magnetic field passes through the magnetic gap 24 after superposition, thereby increasing the density of the magnetic flux in 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-emitting device 100, and effectively improving the flatness of the BL curve, so that the FR frequency response curve is significantly improved and the harmonic distortion THD is effectively reduced, so that the sound effect and performance of the whole machine are better improved.

[0073] In one embodiment, if Figure 3 to Figure 4As shown, the middle piece 232 may be selected as the third side magnet. By magnetizing the first side magnet 231 and the second side magnet 233 of the side magnet part 23 in the vertical direction, the magnetizing direction of the middle piece 232 is perpendicular to the magnetizing direction of the first side magnet 231 and the second side magnet 233, and the magnetic poles of the ends of the first side magnet 231 and the second side magnet 233 that are far from each other are the same as the magnetic poles of the side of the second center magnet 222 close to the magnetic gap 24, so that the first side magnet 231 of the side magnet part 23, the middle piece 232 and the second side magnet 233 form a Halbach array with a magnetic field enhancement on one side of the magnetic gap 24, thereby increasing the density of the magnetic flux of the magnetic gap 24, increasing the number of magnetic lines of force passing through the voice coil 32, increasing the magnetic field force on the voice coil 32, effectively improving the BL value, improving the sensitivity of the sound-generating device 100, and improving the sound effect and performance of the whole machine.

[0074] It can be understood that the first side magnet 231 and the second side magnet 233 are both magnetized along the vibration direction of the vibration system 3, that is, they are both magnetized along the moving direction of the voice coil 32. Optionally, the first side magnet 231 and the second side magnet 233 are both magnetized along the vertical direction. In this embodiment, the first side magnet 231 and the second side magnet 233 of the side magnet portion 23 are both magnetized along the vertical direction, and the magnetizing direction of the middle piece 232 is perpendicular to the magnetizing directions of the first side magnet 231 and the second side magnet 233, that is, the middle piece 232 is magnetized in the horizontal direction, and the first side magnet 231 and the second side magnet 233 of the side magnet portion 23 are both magnetized in the vertical direction, so as to effectively superimpose and form a magnetic field with a higher magnetic field strength.

[0075] In one embodiment, the first side magnet 231 includes multiple first side magnets 231, which are arranged adjacent to each other and located between the middle piece 232 and the magnetic yoke 21; wherein the multiple first side magnets 231 are magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple first side magnets 231 are the same.

[0076] In this embodiment, if Figure 3 , Figure 4 As shown, by setting the first side magnet 231 to be multiple, the multiple first side magnets 231 are laid flat between the magnetic yoke 21 and the middle piece 232. Optionally, the multiple first side magnets 231 are all magnetized in the vertical direction, and the magnetization directions of the multiple first side magnets 231 are the same. That is, the multiple first side magnets 231 are all magnetized in the direction of movement of the voice coil 32, and the multiple first side magnets 231 are magnetized upward or downward at the same time, which is not limited here.

[0077] It can be understood that the first side magnet 231 can be an integral square plate-like structure, arranged between the magnetic yoke 21 and the middle piece 232; or, multiple first side magnets 231 are adjacently and parallelly arranged between the middle piece 232 and the magnetic yoke 21, so that multiple first side magnets 231 cooperate to form a square plate-like structure, which is not limited here.

[0078] In this 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. Optionally, one or more first side magnets 231 are arranged adjacent to each other and extend along the long side 321 or the short side 322, that is, one or more first side magnets 231 are arranged adjacent to each other and are located outside the long side 321 or the short side 322 of the voice coil 32. Of course, in other embodiments, the first side magnet 231 can be optionally in an annular structure, in which case the first side magnet 231 is arranged around the outside of the voice coil 32, which is not limited here.

[0079] In one embodiment, the middle piece 232 includes a plurality of middle pieces 232, which are disposed adjacent to each other and located between the first side magnet 231 and the second side magnet 233. Figure 3 to Figure 4 As shown, by providing a plurality of intermediate members 232 , the plurality of intermediate members 232 are laid flat between the first side magnet 231 and the second side magnet 233 .

[0080] It can be understood that the middle piece 232 can be an integral square plate-like structure, disposed between the first side magnet 231 and the second side magnet 233; or, multiple first side magnets 231 are adjacently and parallelly arranged between the first side magnet 231 and the second side magnet 233, so that multiple first side magnets 231 cooperate to form a square plate-like structure, which is not limited here.

[0081] In this 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. Optionally, one or more intermediate pieces 232 are arranged adjacent to each other and extend along the long side 321 or the short side 322, that is, one or more intermediate pieces 232 are arranged adjacent to each other and are located outside the long side 321 or the short side 322 of the voice coil 32. Of course, in other embodiments, the intermediate piece 232 may optionally be in an annular structure, in which case the intermediate piece 232 is arranged around the outside of the voice coil 32, which is not limited here.

[0082] In one embodiment, the second side magnet 233 includes multiple second side magnets 233, which are arranged adjacent to each other and located on the side of the middle piece 232 facing away from the first side magnet 231; wherein the multiple second side magnets 233 are all magnetized along the vibration direction of the vibration system 3, and the magnetization directions of the multiple second side magnets 233 are the same.

[0083] In this embodiment, if Figure 3 , Figure 4As shown, by setting the second side magnet 233 to be multiple, the multiple second side magnets 233 are laid flat on the side of the middle piece 232 facing away from the first side magnet 231. Optionally, the multiple second side magnets 233 are all magnetized in the vertical direction, and the magnetization directions of the multiple second side magnets 233 are the same. That is, the multiple second side magnets 233 are all magnetized in the direction of movement of the voice coil 32, and the multiple second side magnets 233 are magnetized upward or downward at the same time, which is not limited here.

[0084] It can be understood that the second side magnet 233 can be an integral square plate-like structure, which is arranged on the side of the intermediate piece 232 facing away from the first side magnet 231; or, multiple second side magnets 233 are arranged adjacently and in parallel on the side of the intermediate piece 232 facing away from the first side magnet 231, so that the multiple second side magnets 233 cooperate to form a square plate-like structure, which is not limited here.

[0085] 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, the second side magnet 233 may be in a ring structure, and the second side magnet 233 is arranged around the outside of the voice coil 32, which is not limited here.

[0086] In one embodiment, the projection of at least part of the middle piece 232 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 allows the magnetic flux lines of the first side magnet 231 and the second side magnet 233 of the side magnet portion 23 to gather on the middle piece 232 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 middle piece 232 along the horizontal direction is located in the projection of the voice coil 32 along the horizontal direction.

[0087] Optionally, the thickness of the middle piece 232 is less than or equal to the thickness of the first side magnet 231 , and the thickness of the middle piece 232 is less than or equal to the thickness of the second side magnet 233 , which is not limited here.

[0088] In one embodiment, at least a portion of the projection of the second central magnet 222 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 central magnet 221 and the third central magnet 223 of the central magnetic portion 22 to gather at the second central magnet 222 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 second central magnet 222 along the horizontal direction is located in the projection of the voice coil 32 along the horizontal direction.

[0089] Optionally, the thickness of the second central magnet 222 is less than or equal to the thickness of the first central magnet 221, and the thickness of the second central magnet 222 is less than or equal to the thickness of the third central magnet 223, which is not limited here. In this embodiment, the thickness of the second central magnet 222 is optionally equivalent to the thickness of the intermediate member 232.

[0090] In one embodiment, the magnetic yoke 21 includes a first magnetic yoke 211 and a second magnetic yoke 212 arranged opposite to each other, the central magnetic portion 22 and the side magnetic portion 23 are arranged between the first magnetic yoke 211 and the second magnetic yoke 212, the first central magnet 221 is connected to the first magnetic yoke 211, and the third central magnet 223 is connected to the second magnetic yoke 212.

[0091] In this embodiment, if Figures 1 to 4 As shown, by setting the magnetic yoke 21 as the first magnetic yoke 211 and the second magnetic yoke 212 which are arranged opposite to each other, an installation space is formed between the first magnetic yoke 211 and the second magnetic yoke 212, and the central magnetic part 22 and the side magnetic part 23 are arranged between the first magnetic yoke 211 and the second magnetic yoke 212, that is, the first central magnet 221 of the central magnetic part 22 and the first side magnet 231 of the side magnetic part 23 are connected to the first magnetic yoke 211, and the third central magnet 223 of the central magnetic part 22 and the second side magnet 233 of the side magnetic part 23 are connected to the second magnetic yoke 212. It can be understood that in this way, the magnetic flux generated by the central magnetic part 22 and the magnetic flux generated by the side magnetic part 23 can effectively form a magnetic circuit passing through the voice coil 32 in the magnetic gap 24, effectively increase the density of the magnetic flux of the magnetic gap 24, so that the voice coil 32 is in a more reasonable magnetic field, so as to alleviate the distortion of the audio output by the sound device 100 and improve the sound quality of the audio output by the sound device 100.

[0092] In one embodiment, the sound generating device 100 further includes a housing 1 , the housing 1 is provided with a mounting cavity 11 , and the magnetic circuit system 2 and the vibration system 3 are disposed in the mounting cavity 11 .

[0093] In this embodiment, if Figures 1 to 4As shown, the housing 1 includes a first shell 15 and a second shell 16, and the first shell 15 and the second shell 16 enclose a mounting cavity 11. It can be understood that the first shell 15 and / or the second shell 16 include a bottom plate and a side plate arranged at the periphery of the bottom plate, so that the side plate and the bottom plate enclose a receiving cavity with an opening at one end, and at this time, the first shell 15 and the second shell 16 are connected to cover the opening and enclose the mounting cavity 11.

[0094] It can be understood that the magnetic circuit system 2 is arranged between the first shell 15 and the second shell 16, and the periphery of the diaphragm 31 of the vibration system 3 is connected to the first shell 15 and / or the second shell 16. Optionally, the first magnetic yoke 211 and the second magnetic yoke 212 of the magnetic circuit system 2 are respectively connected to the bottom plates of the first shell 15 and the second shell 16, and at this time, a through hole structure for the magnetic circuit system 2 to pass through is provided in the center of the diaphragm 31, the periphery of the diaphragm 31 is connected to the shell 1, and the center of the diaphragm 31 is connected to the magnetic circuit system 2 or the shell 1, which is not limited here.

[0095] In one embodiment, the housing 1 further comprises a first through hole 12 and a second through hole 13 connected to the mounting cavity 11 , the first yoke 211 is connected to the housing 1 and is located in the first through hole 12 , and the second yoke 212 is connected to the housing 1 and is located in the second through hole 13 .

[0096] In this embodiment, if Figures 1 to 4 As shown, the first shell 15 and the second shell 16 both include a bottom plate and a side plate arranged at the periphery of the bottom plate, and the bottom plates of the first shell 15 and the second shell 16 are respectively provided with a first through hole 12 and a second through hole 13 corresponding to the first magnetic yoke 211 and the second magnetic yoke 212 of the magnetic yoke 21, that is, the bottom plate of the first shell 15 is provided with a first through hole 12, and the bottom plate of the second shell 16 is provided with a second through hole 13.

[0097] It can be understood that the first magnetic yoke 211 of the magnetic yoke 21 is connected to the first shell 15 of the housing 1 and is located in the first through hole 12, and the second magnetic yoke 212 of the magnetic yoke 21 is connected to the second shell 16 of the housing 1 and is located in the second through hole 13. Optionally, the periphery of the diaphragm 31 is sandwiched between the first shell 15 and the second shell 16.

[0098] In one embodiment, the diaphragm 31 is arranged around the magnetic circuit system 2, the voice coil 32 is located in the magnetic gap 24, the vibration system 3 also includes a skeleton 33, the side magnetic part 23 is provided with an avoidance gap 234 connected to the magnetic gap 24, one end of the skeleton 33 is connected to the diaphragm 31, and the other end of the skeleton 33 passes through the avoidance gap 234 to connect to the voice coil 32.

[0099] In this embodiment, if Figure 3As 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.

[0100] In one embodiment, the skeleton 33 includes a main body and a connecting portion connected to the periphery of the main body, the main body is connected to the diaphragm 31 , and the connecting portion passes through the avoidance gap 234 and is connected to the voice coil 32 .

[0101] It can be understood that the skeleton 33 includes one, and in this case the skeleton 33 includes a main body and a plurality of connecting parts. Optionally, the main body is an annular structure, and the plurality of connecting parts are arranged at intervals on the main body. Optionally, the main body is arranged in a rectangular annular shape, and the connecting parts include four, and the four connecting parts are arranged at the four corners of the main body respectively.

[0102] Of course, the skeleton 33 may also include multiple skeletons, for example, the skeleton 33 includes two or four skeletons. When there are two skeletons 33, the two skeletons 33 are symmetrically arranged, that is, the two skeletons 33 are arranged corresponding to the two short sides 322 or the two long sides 321 of the voice coil 32. At this time, each skeleton 33 includes a main body and two connecting parts, the main body is connected to the diaphragm 31, one end of the two connecting parts is respectively connected to the two ends of the main body, and the other ends of the two connecting parts are respectively connected to the voice coil 32 through the avoidance gap 234. When there are four skeletons 33, the four skeletons 33 are arranged corresponding to the four corners of the voice coil 32. At this time, each skeleton 33 includes a main body and a connecting part, the main body is connected to the diaphragm 31, one end of the connecting part is respectively connected to the two ends of the main body, and the other end of the connecting part is respectively connected to the voice coil 32 through the avoidance gap 234, which is not limited here.

[0103] It is understandable that the lead wire of the voice coil 32 can also be guided to the housing 1 through the skeleton 33 and connected to the external circuit. The skeleton 33 not only connects and fixes the voice coil 32, but also prevents the voice coil 32 from swinging or polarizing during vibration.

[0104] 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 connected to the skeleton 33, the inner ring portion 311 is formed with an inner ring hole 312, and the magnetic circuit system 2 is passed through the inner ring hole 312.

[0105] In this embodiment, if Figure 3 and Figure 4As 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 .

[0106] It can be understood that the first fold ring 313 and the second fold ring 315 of the diaphragm 31 are in a convex structure that bulges upward or a concave structure that bulges downward, which is not limited here. Optionally, the convex direction of the first fold ring 313 is the same as or opposite to the convex direction of the second fold ring 315. In this embodiment, the first fold ring 313 and the second fold ring 315 can bulge upward or bulge downward at the same time. Of course, in other embodiments, one of the first fold ring 313 and the second fold ring 315 can bulge upward and the other can bulge downward, which is not limited here.

[0107] In one embodiment, if Figure 3 and Figure 4 As shown, the diaphragm 31 further includes a reinforcement portion 317, which is disposed between the straight portion 314 and the frame 33. It can be understood that by providing the reinforcement portion 317, the structural strength of the diaphragm 31 can be effectively strengthened, thereby improving the connection stability of the voice coil 32, and avoiding problems such as tearing of the diaphragm 31 when the voice coil 32 drives the diaphragm 31 to vibrate.

[0108] In one embodiment, the housing 1 is further provided with a support member 14 . The support member 14 is an annular structure. The support member 14 is provided on a side of the diaphragm 31 away from the frame 33 . The inner ring portion 311 is connected to the support member 14 .

[0109] In this embodiment, if Figure 3 and Figure 4 As shown, by providing the support member 14, it is convenient to use the support member 14 to fix the central part of the diaphragm 31, that is, the inner ring part 311 of the diaphragm 31 is connected to the support member 14. It can be understood that the support member 14 is protruding from the bottom plate of the first shell 15 and / or the second shell 16. The support member 14 is adjacent to the magnetic circuit system 2.

[0110] Optionally, the support member 14 is arranged in an annular shape, and the support member 14 surrounds the magnetic circuit system 2. By arranging the support member 14 on the side of the diaphragm 31 away from the skeleton 33, the inner ring portion 311 is connected to the support member 14, so that the diaphragm 31 can be fixed, and the skeleton 33 and the voice coil 32 can be supported and fixed.

[0111] In this embodiment, the side of the diaphragm 31 away from the skeleton 33 is enclosed with the shell 1 to form a front cavity, that is, the diaphragm 31 and the second shell 16 are enclosed to form a front cavity, and the side of the diaphragm 31 facing the skeleton 33 is enclosed with the shell 1 to form a rear cavity, that is, the diaphragm 31 and the first shell 15 are enclosed to form a rear cavity. It can be understood that in order to facilitate the sound-emitting device 100 to produce sound smoothly, the shell 1 is provided with a sound outlet hole connected to the front cavity. By providing the support member 14, it can be effectively ensured that the diaphragm 31 isolates the front cavity and the rear cavity. In order to ensure the air pressure balance between the front cavity and the rear cavity, the shell 1 is provided with an air vent connected to the rear cavity, which is not limited here.

[0112] The utility model also 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 repeated here one by one.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, 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 central magnet, a second central magnet and a third central magnet arranged in a stacked manner; A vibration system, the vibration system comprising a diaphragm and a voice coil connected to the diaphragm, the diaphragm is arranged around the magnetic circuit system, the voice coil is arranged in the magnetic gap and connected to the diaphragm through a frame; Wherein, the first central magnet and the third central magnet are both magnetized along the vibration direction of the vibration system, the magnetization direction of the second central magnet is perpendicular to the magnetization directions of the first central magnet and the third central magnet, and the magnetic poles at one end of the first central magnet and the third central magnet that are away from each other are opposite to the magnetic poles at the side of the second central magnet close to the magnetic gap.

2. The sound-generating device according to claim 1, characterized in that: The side magnet part includes a first side magnet, an intermediate piece, and a second side magnet which are stacked, and the first side magnet, the intermediate piece, and the second side magnet correspond to the first center magnet, the second center magnet, and the third center magnet in a one-to-one manner in a direction perpendicular to the vibration direction of the vibration system. The first side magnet and the second side magnet are both magnetized along the vibration direction of the vibration system, and the magnetic poles at the ends away from each other are the same as the magnetic poles at the side of the second center magnet close to the magnetic gap.

3. The sound-generating device according to claim 2, characterized in that: The intermediate member is a third side magnet, the magnetization direction of the third side magnet is perpendicular to the magnetization direction of the first center magnet, and the magnetic pole of the third side magnet close to the magnetic gap is opposite to the magnetic pole of the second center magnet close to the magnetic gap; Alternatively, the intermediate piece is an edge magnetic conductive plate.

4. The sound generating device according to claim 2, characterized in that: A projection of at least part of the second central magnet 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; And / or, a projection of at least part of the intermediate member 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.

5. The sound generating device according to any one of claims 1 to 4, characterized in that: The sound-generating device further comprises a shell, the shell is provided with an installation cavity, and the magnetic circuit system and the vibration system are arranged in the installation cavity.

6. The sound generating device according to claim 5, characterized in that: The magnetically conductive yoke includes a first magnetic yoke and a second magnetic yoke that are arranged opposite to each other. The central magnetic portion and the side magnetic portion are arranged between the first magnetic yoke and the second magnetic yoke. The first central magnet is connected to the first magnetic yoke, and the third central magnet is connected to the second magnetic yoke.

7. The sound generating device according to claim 6, characterized in that: The housing is further provided with a first through hole and a second through hole communicating with the mounting cavity. The first magnetic yoke is connected to the housing and located in the first through hole. The second magnetic yoke is connected to the housing and located in the second through hole.

8. The sound generating device according to claim 5, characterized in that: The edge magnet part is provided with an escape gap communicating with the magnetic gap, one end of the skeleton is connected to the diaphragm, and the other end of the skeleton passes through the escape gap and is connected to the voice coil.

9. The sound-generating device according to claim 8, 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 outer shell, the straight portion is connected to the frame, the inner ring portion is formed with an inner ring hole, and the magnetic circuit system is passed through the inner ring hole.

10. The sound generating device according to claim 9, 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 protruding direction of the first fold ring is the same as or opposite to the protruding direction of the second fold ring; And / or, the diaphragm further comprises a reinforcement portion, wherein the reinforcement portion is disposed between the straight portion and the frame; And / or, the housing is further provided with a support member, the support member is a ring-shaped structure, the support member is provided on a side of the diaphragm away from the frame, and the inner ring portion is connected to the support member.

11. An electronic device, characterized in that: The electronic device comprises the sound emitting device according to any one of claims 1 to 10.

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