Sound production monomer and sound production module

Abstract

The application discloses a sound production monomer and a sound production module, and relates to the technical field of sound energy conversion. The sound production monomer comprises a shell, a magnetic circuit system and a vibration system, and a plurality of accommodating cavities are formed in the shell. Each of the accommodating cavities accommodates a magnetic circuit system, each of the magnetic circuit systems comprises a center magnetic circuit and an edge magnetic circuit, the center magnetic circuit comprises a center magnetic conducting plate and first and second center magnetic steels, the edge magnetic circuit comprises first and second edge magnetic steels, each of the magnetic circuit systems corresponds to a vibration system, and each of the vibration systems comprises a diaphragm and a voice coil. In a first working mode, at least one vibration system radiates a first phase of sound waves outward, and the remaining at least one vibration system radiates a second phase of sound waves outward, the first phase and the second phase are opposite phases, a dipole effect is formed, and call privacy is improved. The center magnetic conducting plate gathers magnetic induction lines, the magnetic induction lines uniformly pass through the voice coil and form a magnetic loop, and the acoustic performance of the loudspeaker is improved.

Description

Technical Field

[0001] This invention relates to the field of sound energy conversion technology, and in particular to a sound-generating unit and a sound-generating module. Background Technology

[0002] With the development of the portable consumer electronics market, miniature sound-generating devices have been widely used. Furthermore, with the multi-functional and miniaturized design of portable terminal electronic products, there is a demand for loudspeakers to achieve high acoustic performance and more functions within a certain size. However, the increase in functions leads to an increase in size. Summary of the Invention

[0003] The main objective of this invention is to propose a sound-generating unit and a sound-generating module, aiming to solve the problem of how to increase the functionality of a loudspeaker and improve its acoustic performance while keeping the loudspeaker volume constant.

[0004] To achieve the above objectives, according to some embodiments of the present invention, the present invention provides a sound-generating unit, comprising:

[0005] The housing has multiple receiving cavities arranged along a second direction inside it;

[0006] The magnetic circuit system includes a corresponding receiving cavity housing one magnetic circuit system. Each magnetic circuit system includes a central magnetic circuit and a side magnetic circuit. The central magnetic circuit includes a central magnetic guide plate and a first central magnet and a second central magnet respectively connected to both sides of the central magnetic guide plate along a first direction. The side magnetic circuit includes a first side magnet surrounding the first central magnet and a second side magnet surrounding the second central magnet. The first central magnet and the first side magnet are spaced apart to form a first magnetic gap, and the second central magnet and the second side magnet are spaced apart to form a second magnetic gap. The first direction and the second direction are perpendicular.

[0007] The vibration system, each of the magnetic circuit systems corresponds to one of the vibration systems, each of the vibration systems includes a ring-shaped diaphragm and a voice coil connected to the diaphragm, the diaphragm and the voice coil are arranged around the central magnetic circuit and the inner periphery of the diaphragm is fixed to the central magnetic circuit, the voice coil is used to drive the diaphragm to vibrate along the first direction; the two ends of the voice coil along the first direction correspond to the first magnetic gap and the second magnetic gap respectively;

[0008] The sound-generating unit includes a first operating mode, in which at least one of the vibration systems radiates a sound wave of a first phase outward, and at least one other vibration system radiates a sound wave of a second phase outward, wherein the first phase and the second phase are opposite phases.

[0009] In some embodiments, the sound-generating unit further includes a second operating mode, and the number of accommodating cavities is two. In the first operating mode, the two vibration systems radiate sound waves with opposite phases to the outside; in the second operating mode, the two vibration systems radiate sound waves with the same phase to the outside.

[0010] Alternatively, the sound-generating unit may include a second operating mode in which multiple vibration systems radiate sound waves of the same phase outward.

[0011] In some embodiments, the inner periphery of the diaphragm is connected to the side of the central magnetic circuit;

[0012] And / or, the inner periphery of the diaphragm is connected to the side of the central magnetic circuit, the outer edge of the diaphragm is sealed to the housing, the diaphragm divides the receiving cavity into an independent front cavity and a rear cavity, the first central magnet is located in the front cavity, the second side magnet is located in the rear cavity, and the housing is provided with a sound hole communicating with the front cavity;

[0013] And / or, the diaphragm includes a first portion connected to a first end of the voice coil and a second portion connected to a side of the voice coil;

[0014] And / or, the diaphragm includes a first portion connected to a first end of the voice coil and a second portion connected to a side of the voice coil, the top surface of the first portion of the diaphragm does not extend beyond the top surface of the magnetic circuit system, and the second portion of the diaphragm is at least partially located between the first side magnet and the second side magnet.

[0015] In some embodiments, the first central magnet and the second central magnet are both magnetized along the first direction but in opposite directions, the magnetization direction of the first side magnet is parallel to and opposite to the magnetization direction of the first central magnet, and the magnetization direction of the second side magnet is parallel to and opposite to the magnetization direction of the second central magnet.

[0016] And / or, the side of each first side magnet facing the second side magnet is exposed to the receiving cavity, and the side of each second side magnet facing the first side magnet is exposed to the receiving cavity.

[0017] In some embodiments, the projected outer contour of the first central magnet in the first direction is located within the projected outer contour of the central magnetic guide plate in the first direction, so that the side of the central magnetic guide plate opposite to the second central magnet forms an annular connection region; each diaphragm includes an annular diaphragm body, and a central hole is provided on the annular diaphragm body.

[0018] The first central magnet passes through the central hole, the outer edge of the annular membrane body is connected to the shell, and the inner circumference of the annular membrane body is connected to the annular connection area;

[0019] Alternatively, the inner circumference of the annular membrane body is sandwiched between the annular connecting region and the first central magnet.

[0020] In some embodiments, the outer edge of the annular diaphragm body is sealed to the housing, and the inner circumference of the annular diaphragm body is sealed to the annular connection area, so that the annular diaphragm body divides the receiving cavity into a front cavity and a rear cavity that are independent of each other. The first side magnet and the first center magnet are located in the front cavity, and the voice coil, the central magnetic plate, the second side magnet and the second center magnet are located in the rear cavity.

[0021] In some embodiments, each of the annular diaphragm bodies includes an inner diaphragm and an outer diaphragm. The outer diaphragm is located between the first side magnet and the second side magnet, and the outer diaphragm includes a first outer connecting portion, a first folded ring, and a first inner connecting portion arranged in sequence around the inner diaphragm. The inner diaphragm includes a second outer connecting portion, a voice coil connecting portion, a second folded ring, and a second inner connecting portion arranged in sequence around the inner diaphragm. The first inner connecting portion is sealed to the second outer connecting portion, and the first outer connecting portion is sealed to the housing. The voice coil connecting portion includes a flat portion and a side portion. The flat portion is connected to the second folded ring, and the side portion is connected to the second outer connecting portion, so that the first folded ring and the second folded ring are located in different planes. The voice coil is fixed to the flat portion and / or the side portion, and the second inner connecting portion is sealed to the annular connecting region.

[0022] In some embodiments, the second folded ring protrudes away from the second center magnet, the second folded ring is located in the gap between the first side magnet and the first center magnet, and the opening of the second folded ring faces the gap between the voice coil and the center magnetic plate.

[0023] And / or, the diaphragm further includes a reinforcing portion, which is located between the first side magnet and the second side magnet, and the reinforcing portion is fixed to the first inner connecting portion or the second outer connecting portion;

[0024] And / or, the projection of the first central magnet in the first direction lies within the projection of the second central magnet in the first direction.

[0025] In some embodiments, there are multiple first side magnets, which are arranged sequentially along the circumference of the first central magnet; there are multiple second side magnets, which are arranged sequentially along the circumference of the second central magnet, and the multiple first side magnets and the multiple second side magnets correspond one-to-one along the first direction.

[0026] Alternatively, the first side magnet is annular, the second side magnet is annular, and the first side magnet and the second side magnet are arranged opposite each other along the first direction.

[0027] In some embodiments, the housing includes a first housing body and a second housing body, with the outer edge of the diaphragm sandwiched between the first housing body and the second housing body; the sound-generating unit further includes a first magnetic yoke and a second magnetic yoke, the first magnetic yoke being disposed on the side of the first housing body away from the second housing body, the first housing body having a first clearance hole, the first side magnet and the first center magnet being disposed in the first clearance hole, the first side magnet and the first center magnet being fixed to the first magnetic yoke, the second magnetic yoke being disposed on the side of the second housing body away from the first housing body, the second housing body having a second clearance hole, the second side magnet and the second center magnet being disposed in the second clearance hole, the second side magnet and the second center magnet being fixed to the second magnetic yoke.

[0028] In some embodiments, the sound-generating unit further includes a first connector and a second connector spaced apart on both sides of the housing along the second direction, one end of the first connector being connected to the first magnetic yoke and the other end of the first connector being connected to the second magnetic yoke; one end of the second connector being connected to the first magnetic yoke and the other end of the second connector being connected to the second magnetic yoke.

[0029] According to some embodiments of the present invention, the present invention also provides a sound-generating module, the sound-generating module including a housing and the aforementioned sound-generating unit, the sound-generating unit being disposed within the housing.

[0030] The technical solution of this invention employs multiple magnetic circuit systems, each including a central magnetic circuit and side magnetic circuits. The central magnetic circuit includes a central magnetic guide plate and a first central magnet and a second central magnet respectively disposed on both sides of the central magnetic guide plate along a first direction. The side magnetic circuit includes a first side magnet surrounding the first central magnet and a second side magnet surrounding the second central magnet. The first central magnet and the first side magnet form a first magnetic gap, and the second central magnet and the second side magnet form a second magnetic gap. Each magnetic circuit system corresponds to a vibration system, which includes a voice coil and an annular diaphragm connected to the voice coil. The two ends of the voice coil are... The first magnetic gap and the second magnetic gap are respectively. Since there are multiple vibration systems and magnetic circuit systems, the sound-generating unit has a first working mode. In the first working mode, at least one vibration system radiates sound waves of the first phase, and at least one vibration system in the remaining vibration systems radiates sound waves of the second phase. The first phase and the second phase are opposite phases, which can form a dipole effect and improve the privacy of the call. In addition, this embodiment sets a central magnetic guide plate in each magnetic circuit system. The magnetic field lines are gathered by the central magnetic guide plate, so that the magnetic field lines pass through the voice coil evenly and form a magnetic circuit, thereby improving the acoustic performance of the speaker. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the sound-emitting unit from one perspective according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the sound-emitting unit from another perspective in an embodiment of the present invention;

[0034] Figure 3 This is a cross-sectional structural diagram of one embodiment of the sound-generating unit of the present invention;

[0035] Figure 4 This is an exploded structural diagram of one embodiment of the sound-emitting monomer of the present invention;

[0036] Figure 5 This is a cross-sectional structural diagram of a portion of the structure of a sound-generating unit according to an embodiment of the present invention;

[0037] Figure 6 This is a simulation diagram of the magnetic circuit system and the corresponding vibration system magnetic field line distribution of a sound-generating unit according to an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the frequency response curve of the sound-generating unit in an embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the structure of a centering support for the sound-generating unit according to an embodiment of the present invention.

[0040] Explanation of icon numbers:

[0041] 100. Sound-generating unit; 1. Housing; 11. Receiving cavity; 111. Front cavity; 112. Rear cavity; 113. Sound hole; 12. First shell body; 121. First clearance hole; 13. Second shell body; 131. Second clearance hole; 2. Magnetic circuit system; 21. Central magnetic circuit; 211. First central magnet; 212. Second central magnet; 213. Central magnetic guide plate; 2131. Annular connecting area; 22. Side magnetic circuit; 221. First side magnet; 222. Second side magnet; 2221. Clearance space; 23. First magnetic gap; 24. Second magnetic gap; 3. Vibration system; 31. Diaphragm; 311. Annular diaphragm body; 3111, Outer diaphragm; 31111, First outer connecting part; 31112, First surround; 31113, First inner connecting part; 3112, Inner diaphragm; 31121, Second outer connecting part; 31122, Voice coil connecting part; 31123, Flat part; 31124, Side part; 31125, Second surround; 31126, Second inner connecting part; 3113, Center hole; 312, Reinforcing part; 3121, Bending part; 32, Voice coil; 41, First yoke; 42, Second yoke; 51, First connector; 52, Second connector; 6, Centering support; 61, First connecting part; 62, Second connecting part; 63, Spring arm part.

[0042] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0045] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0046] With the development of the portable consumer electronics market, miniature sound-generating devices have been widely used. Furthermore, with the multi-functional and miniaturized design of portable terminal electronic products, there is a demand for speakers to achieve higher performance and more functions within a certain size. However, the increase in functions leads to an increase in size.

[0047] The inventors discovered that existing speakers have relatively limited functionality, with most only offering simple external playback. For private calls, direct external playback would obviously compromise the privacy of the call content, failing to meet users' needs for private calls. Furthermore, current methods for improving the acoustic performance of speakers generally involve increasing the size of the magnet to enhance the magnetic field strength, thereby improving speaker performance. However, this method undoubtedly leads to an overall increase in speaker size, which clearly contradicts the trend of speaker miniaturization.

[0048] In view of this, the present invention proposes a sound-generating unit and a sound-generating module, aiming to solve the problem of how to increase the function of the speaker and improve its acoustic performance while keeping the speaker volume constant.

[0049] Please see Figure 1 , Figure 3 and Figure 4In one embodiment of the present invention, the sound-generating unit 100 includes a housing 1, a magnetic circuit system 2, and a vibration system 3. The housing 1 contains a plurality of receiving cavities 11 arranged along a second direction. Each receiving cavity 11 correspondingly accommodates a magnetic circuit system 2. Each magnetic circuit system 2 includes a central magnetic circuit 21 and a side magnetic circuit 22. The central magnetic circuit 21 includes a central magnetic guide plate 213 and a first central magnet 211 and a second central magnet 212 respectively connected to both sides of the central magnetic guide plate 213 along a first direction. The side magnetic circuit 22 includes a first side magnet 221 surrounding the first central magnet 211 and a second side magnet 222 surrounding the second central magnet 212. The first central magnet 211 and the first side magnet 221 are spaced apart to form a first magnetic gap 23. The second central magnet 212 and the second side magnet 222 are spaced apart to form a second magnetic gap 23. The edge magnets 222 are spaced to form a second magnetic gap 24; the first direction and the second direction are perpendicular; each magnetic circuit system 2 corresponds to a vibration system 3, and each vibration system 3 includes a ring-shaped diaphragm 31 and a voice coil 32 connected to the diaphragm 31. The diaphragm 31 and the voice coil 32 are arranged around the central magnetic circuit 21 and the inner circumference of the diaphragm 31 is fixed to the central magnetic circuit 21. The voice coil 32 is used to drive the diaphragm 31 to vibrate along the first direction; the two ends of the voice coil 32 along the first direction correspond to the first magnetic gap 23 and the second magnetic gap 24, respectively; the sound-generating unit 100 includes a first working mode. In the first working mode, at least one vibration system 3 radiates a sound wave of the first phase outward, and at least one other vibration system 3 radiates a sound wave of the second phase outward. The first phase and the second phase are opposite phases.

[0050] The sound-emitting unit 100 of this invention can be a loudspeaker unit, and can be applied in the sound-emitting module of electronic devices, such as computers, mobile phones, smart wearable devices, laptops, virtual reality devices, augmented reality devices, mixed reality devices, or extended reality devices. This embodiment uses a loudspeaker unit as an example for illustration.

[0051] The technical solution of this invention employs multiple magnetic circuit systems 2, each including a central magnetic circuit 21 and a side magnetic circuit 22. The central magnetic circuit 21 includes a central magnetic guide plate 213 and a first central magnet 211 and a second central magnet 212 respectively disposed on both sides of the central magnetic guide plate 213 along a first direction. The side magnetic circuit 22 includes a first side magnet 221 surrounding the first central magnet 211 and a second side magnet 222 surrounding the second central magnet 212. The first central magnet 211 and the first side magnet 221 form a first magnetic gap 23, and the second central magnet 212 and the second side magnet 222 form a second magnetic gap 24. Each magnetic circuit system 2 corresponds to a vibration system 3. The 3 includes a voice coil 32 and an annular diaphragm 31 connected to the voice coil 32. The two ends of the voice coil 32 correspond to a first magnetic gap 23 and a second magnetic gap 24, respectively. Since there are multiple vibration systems 3 and magnetic circuit systems 2, the sound-generating unit 100 has a first operating mode. In this first operating mode, at least one vibration system 3 radiates sound waves of a first phase outwards, and at least one of the remaining vibration systems 3 radiates sound waves of a second phase outwards. The first and second phases are opposite phases, which can form a dipole effect, thereby achieving sound cancellation at a distance from the sound-generating unit 100. Applying the sound-generating unit 100 to voice calls can effectively reduce call leakage, thereby improving user privacy. The first direction is... Figure 3 The vertical direction is shown, and the second direction is... Figure 3 The left and right directions are shown.

[0052] Specifically, if there are three accommodating cavities 11, the number of magnetic circuit systems 2 is the same as the number of accommodating cavities 11 and they are set up one-to-one, and the number of vibration systems 3 is the same as the number of magnetic circuit systems 2 and they are set up one-to-one, if one of the three vibration systems 3 radiates a sound wave of the first phase outward, then one of the remaining two vibration systems 3 can radiate a sound wave of the second phase outward, or both of the remaining two can radiate a sound wave of the second phase outward, thereby achieving the cancellation of sound output at a distance of the sound-emitting unit 100, effectively reducing sound leakage during calls, and thus improving the user's privacy.

[0053] Furthermore, this embodiment effectively utilizes the gap between the first central magnet 211 and the second central magnet 212 by setting a central magnetic guide plate 213 in each magnetic circuit system 2. This allows the magnetic field lines to be concentrated by the central magnetic guide plate 213 without significantly affecting the size of the speaker. Figure 6 , Figure 6A simulation diagram of the magnetic field line distribution of the speaker unit 100 is shown. Areas with denser magnetic field lines indicate higher magnetic induction intensity. As can be seen from the diagram, the region between the first magnetic gap 23 and the second magnetic gap 24, corresponding to the central magnetic guide plate 213, forms a dense magnetic field line area. The voice coil 32 is positioned within this dense magnetic field line area, allowing the magnetic field lines to pass evenly through the voice coil 32 and form a magnetic loop, thereby increasing the speaker's BL value. Here, BL represents the product of the speaker's magnetic field strength and the length of the voice coil 32, i.e., the combination of B (magnetic flux density) and L (length of the voice coil 32). B represents the magnetic flux density generated by the magnet, usually measured in Tesla (T); L is the effective length of the voice coil 32, usually measured in meters (m). The BL value is one of the key indicators for measuring the speaker's driving capability. The BL value determines the speaker's ability to convert electrical signals into sound. When current passes through the voice coil 32, a larger BL value results in a greater driving force, a higher sound pressure level, and a wider loudness and dynamic range. For example, in a high-power loudspeaker system, a higher BL value can ensure that the loudspeaker maintains good sound performance even at high volume output. Therefore, in this embodiment, by adding a central magnetic guide plate 213 between the first central magnet 211 and the second central magnet 212, the central magnetic guide plate 213 corrects the magnetic field lines emitted by the magnets, thereby allowing more magnetic field lines to pass through the voice coil 32 and form a magnetic circuit, effectively improving the acoustic performance of the sound-generating unit 100.

[0054] Furthermore, the inventors discovered that the diaphragm 31 of existing loudspeakers is generally located on the outside of the magnetic circuit system 2. Therefore, in addition to reserving space for the installation of the firmware itself, existing loudspeakers also require additional space for the vibration space of the diaphragm 31, resulting in a large space occupied by existing loudspeakers. With the trend of miniaturization in electronic devices, the installation space left for loudspeakers is gradually decreasing, making it increasingly difficult for existing loudspeakers to meet the needs of this trend. In this embodiment, by arranging the diaphragm 31 around the central magnetic circuit 21, the diaphragm 31 vibrates essentially within the vibration system 3. This effectively utilizes the gap between the first side magnet 221 and the second side magnet 222 as the vibration space for the diaphragm 31. Therefore, it is essentially unnecessary to allocate additional space outside the vibration system 3 for the vibration of the diaphragm 31, thereby reducing the space required for the installation of the sound-generating unit 100 and allowing the sound-generating unit 100 to better adapt to the miniaturization trend of electronic devices. The space saved, which was originally used for the vibration of the diaphragm 31, can be used to increase the volume of the magnets in the magnetic circuit system 2, thereby improving the acoustic performance of the sound-generating unit 100.

[0055] Furthermore, please refer to Figure 3Compared to the magnetic circuit system 2 with only one magnetic gap, the first side magnet 221 and the second side magnet 222 in this embodiment are symmetrically arranged, and the two ends of the voice coil 32 correspond to the first magnetic gap 23 and the second magnetic gap 24 respectively. This makes the two ends of the voice coil 32 in similar magnetic field environments, which not only helps to improve the BL value, but also the distribution of magnetic field lines at the two ends of the voice coil 32 is roughly the same, which helps to improve the flatness of the BL.

[0056] Please see Figure 3 In this embodiment, the central magnetic plate 213 is connected to a first central magnet 211 and a second central magnet 212 along a first direction. The central magnetic plate 213 can abut against the first central magnet 211 and the second central magnet 212 respectively, and is fixed between the first central magnet 211 and the second central magnet 212. During the vibration of the diaphragm 31 driven by the voice coil 32, the central magnetic plate 213 remains stationary, thereby effectively increasing the magnetic induction intensity and ensuring the stability of the magnetic field.

[0057] In some embodiments, the sound-emitting unit 100 further includes a second operating mode. The number of receiving cavities 11 is two. In the first operating mode, the two vibration systems 3 radiate sound waves with opposite phases. In the second operating mode, both vibration systems 3 radiate sound waves with the same phase. Taking two receiving cavities 11 as an example, each receiving cavity 11 has a corresponding vibration system 3 and magnetic circuit system 2. In the first operating mode, the two vibration systems 3 radiate sound waves with opposite phases; for example, one vibration system 3 radiates a first-phase sound wave, and the other radiates a second-phase sound wave. In the second operating mode, both vibration systems 3 radiate sound waves with the same phase, thereby achieving enhanced external amplification, breaking through sound quality and performance bottlenecks, and improving the overall sound quality and performance of the device. For example, both vibration systems 3 radiate sound waves with the first phase, or both vibration systems 3 radiate sound waves with the second phase.

[0058] In some embodiments, the sound-generating unit 100 includes a second operating mode in which multiple vibration systems 3 radiate sound waves of the same phase outward. The multiple vibration systems 3 may radiate sound waves of a first phase or a second phase, thereby achieving simultaneous vibration of the multiple vibration systems 3 in the same direction. The sound waves of the same phase can superimpose, improving the playback effect, widening the sound playback bandwidth, and achieving enhanced external playback.

[0059] In some embodiments, the inner periphery of the diaphragm 31 is connected to the side of the central magnetic circuit 21. Connecting the inner periphery of the diaphragm 31 to the side of the central magnetic circuit 21, compared to connecting the diaphragm 31 to the top of the central magnetic circuit 21, fully utilizes the space on the side of the central magnetic circuit 21, reducing the space occupied in the thickness direction of the sound-generating unit 100, thus facilitating a reduction in the thickness of the sound-generating unit 100. In a specific embodiment, the side of the central magnetic circuit 21 and the top surface of the central magnetic circuit 21 are not at the same height position, so as to… Figure 5 For example, the position on the side of the central magnetic circuit 21 is lower than the position at the top of the central magnetic circuit 21.

[0060] In some embodiments, the inner periphery of the diaphragm 31 is connected to the side of the central magnetic circuit 21, and the outer edge of the diaphragm 31 is sealed to the housing 1. The diaphragm 31 divides the receiving cavity 11 into two independent front cavities 111 and rear cavities 112. The first central magnet 211 is located in the front cavity 111, and the second side magnet 222 is located in the rear cavity 112. The housing 1 is provided with a sound hole 113 communicating with the front cavity 111. Connecting the inner periphery of the diaphragm 31 to the side of the central magnetic circuit 21, compared to connecting the diaphragm 31 to the top of the central magnetic circuit 21, makes full use of the space on the side of the central magnetic circuit 21, which can reduce the space occupied in the thickness direction of the sound-generating unit 100, and is beneficial to reducing the thickness of the sound-generating unit 100. In addition, sealing the diaphragm 31 to the outer edge of the housing 1 not only provides better waterproofing, but also isolates the front cavity 111 and the rear cavity 112. The sound hole 113 is located in the front cavity 111, so that the rear cavity 112 has better waterproofing performance.

[0061] In some embodiments, the diaphragm 31 includes a first portion connected to a first end 321 of the voice coil 32 and a second portion connected to the side of the voice coil 32; the first end 321 of the voice coil 32 refers to... Figure 5 The top end of the midrange voice coil 32, which is the top of the voice coil 32, has the first part of the diaphragm 31 connected to the top of the voice coil 32, and the other part connected to the side of the voice coil 32. This can improve the reliability of the connection with the voice coil 32, facilitate the voice coil 32 to drive the diaphragm 31 to vibrate, and also make the connection between the voice coil 32 and the diaphragm 31 tighter, saving space inside the sound-generating unit 100.

[0062] In some embodiments, the diaphragm 31 includes a first portion connected to a first end 321 of the voice coil 32 and a second portion connected to a side surface of the voice coil 32. The top surface of the first portion of the diaphragm 31 does not extend beyond the top surface of the magnetic circuit system 2, and the second portion of the diaphragm 31 is at least partially located between the first side magnet 221 and the second side magnet 222. The first end 321 of the voice coil 32 refers to... Figure 5At the top of the voice coil 32, the first part of the diaphragm 31 is connected to the top of the voice coil 32, while the other part is connected to the side of the voice coil 32. This improves the reliability of the connection with the voice coil 32, facilitates the voice coil 32 in driving the diaphragm 31 to vibrate, and also makes the connection between the voice coil 32 and the diaphragm 31 tighter, saving space inside the driver unit 100. Furthermore, the top surface of the first part of the diaphragm 31 is positioned so that it does not extend beyond the top surface of the magnetic circuit system 2. Figure 5 For example, the top surface of the first part of the diaphragm 31 is set lower than the top surface of the magnetic circuit system 2. On the one hand, compared with the diaphragm 31 being set above the top surface of the magnetic circuit system 2, this embodiment can reduce the size of the sound-generating unit 100 in the thickness direction; on the other hand, it ensures that the diaphragm 31 has a corresponding vibration space, improving the space utilization rate within the accommodating cavity 11. At the same time, the second part of the diaphragm 31 is at least partially located between the first side magnet 221 and the second side magnet 222, which is conducive to making full use of the space between the first side magnet 221 and the second side magnet 222, further reducing the volume of the sound-generating unit 100.

[0063] Please see Figure 3 , Figure 4 and Figure 6 In some embodiments, the first center magnet 211 and the second center magnet 212 are both magnetized along a first direction but in opposite directions. The magnetization direction of the first side magnet 221 is parallel to and opposite to the magnetization direction of the first center magnet 211, and the magnetization direction of the second side magnet 222 is parallel to and opposite to the magnetization direction of the second center magnet 212. The fact that the magnetization direction of the first side magnet 221 is parallel to and opposite to the magnetization direction of the first center magnet 211 allows the first center magnet 211 and the first side magnet 221 to form a closed magnetic circuit passing through the voice coil 32, thereby improving the acoustic performance of the sound-generating unit 100. Similarly, the magnetization directions of the first center magnet 211 and the second center magnet 212 are opposite, and the magnetization direction of the second side magnet 222 is parallel to and opposite to the magnetization direction of the second center magnet 212, allowing the second center magnet 212 and the second side magnet 222 to also form a closed magnetic circuit passing through the voice coil 32, thereby improving the acoustic performance of the sound-generating unit 100. For example, if the N pole of the first central magnet 211 faces upward, the N pole of the second central magnet 212 faces downward, the N pole of the first side magnet 221 faces downward, and the N pole of the second side magnet 222 faces upward.

[0064] According to one embodiment of the present invention, the first center magnet 211 and the second center magnet 212 have the same thickness, and the thickness of the center magnetic plate 213 is greater than the thickness of the first center magnet 211. With this arrangement, more magnetic field lines can converge and pass through the voice coil 32 to form a closed magnetic circuit, effectively improving the acoustic performance of the sound-generating unit 100.

[0065] Please seeFigure 3 and Figure 5 In some embodiments, the side of each first side magnet 221 facing the second side magnet 222 is exposed in the receiving cavity 11, and the side of each second side magnet 222 facing the first side magnet 221 is exposed in the receiving cavity 11. Compared to the case where a magnetic guide plate is provided on the side of the first side magnet 221 facing the second side magnet 222, and a magnetic guide plate is also provided on the side of the second side magnet 222 facing the first side magnet 221, in this embodiment, the side of the first side magnet 221 facing the second side magnet 222 in each receiving cavity 11 is exposed in the corresponding receiving cavity 11, and the side of the second side magnet 222 in each receiving cavity 11 facing the first side magnet 221 is exposed in the corresponding receiving cavity 11. The structure of the magnetic guide plate is eliminated, thus effectively reducing the thickness of the sound-generating unit 100 and making the volume of the sound-generating unit 100 smaller.

[0066] Please see Figure 3 , Figure 5 In some embodiments, the projected outer contour of the first central magnet 211 in the first direction is located within the projected outer contour of the central magnetic plate 213 in the first direction, so that the side of the central magnetic plate 213 away from the second central magnet 212 forms an annular connecting region 2131; each diaphragm 31 includes an annular diaphragm body 311, and a central hole 3113 is provided on the annular diaphragm body 311, through which the first central magnet 211 passes; the outer edge of the annular diaphragm body 311 is connected to the housing 1, and the inner circumference of the annular diaphragm body 311 is connected to the annular connecting region 2131 or the inner circumference of the annular diaphragm body 311 is sandwiched between the annular connecting region 2131 and the first central magnet 211. In this configuration, one side of the inner circumference of the annular membrane body 311 is connected to the annular connecting region 2131, and the other side is connected to the side of the first central magnet 211 facing the central magnetic guide plate 213. That is, the annular membrane body 311 is sandwiched between the first central magnet 211 and the annular connecting region 2131. In this case, the distance from the top surface of the first central magnet 211 to the top surface of the central magnetic guide plate 213 is equal to the thickness of the first central magnet 211 plus the thickness of the inner circumference of the annular membrane body 311. Alternatively, a central hole can be opened on the annular membrane body 311 for the first central magnet 211 to pass through. 3113, that is, one side of the annular diaphragm body 311 is connected to the annular connecting area 2131, while the other side is exposed to the receiving cavity 11, so that the distance from the top surface of the first central magnet 211 to the top surface of the central magnetic plate 213 is equal to the thickness of the first central magnet 211, rather than the thickness of the first central magnet 211 plus the thickness of the inner circumference of the annular diaphragm body 311. Therefore, the central hole 3113 avoids the increase in overall thickness caused by the thickness of the inner circumference of the annular diaphragm body 311. Thus, the thickness of the sound-generating unit 100 is effectively reduced by setting the central hole 3113.

[0067] Please see Figure 3 and Figure 5In some embodiments, the outer edge of the annular diaphragm body 311 is sealed to the housing 1, and the inner circumference of the annular diaphragm body 311 is sealed to the annular connecting area 2131, so that the annular diaphragm body 311 divides the receiving cavity 11 into two independent front cavities 111 and rear cavities 112. The first side magnet 221 and the first center magnet 211 are located in the front cavity 111, and the voice coil 32, the central magnetic guide plate 213, the second side magnet 222, and the second center magnet 212 are located in the rear cavity 112. In this embodiment, the outer edge of the annular diaphragm body 311 is sealed to the housing 1, and the inner circumference of the annular diaphragm body 311 is sealed to the annular connecting area 2131, thereby achieving isolation between the front cavity 111 and the rear cavity 112, and ensuring that the rear cavity 112 has good waterproof performance. It should be noted that the housing 1 has a sound hole 113 communicating with the front cavity 111.

[0068] Please see Figures 3 to 5In some embodiments, each annular diaphragm body 311 includes an inner diaphragm 3112 and an outer diaphragm 3111. The outer diaphragm 3111 is located between the first side magnet 221 and the second side magnet 222, and the outer diaphragm 3111 includes a first outer connecting portion 31111, a first folded ring 31112, and a first inner connecting portion 31113 arranged in sequence. The inner diaphragm 3112 includes a second outer connecting portion 31121, a voice coil connecting portion 31122, a second folded ring 31125, and a second inner connecting portion 31126 arranged in sequence. The first inner connecting portion 31113 is connected to the first outer connecting portion 31121, the voice coil connecting portion 31122, the second folded ring 31125, and the second inner connecting portion 31126. The two outer connecting parts 31121 are sealed together. The first outer connecting part 31111 is sealed together with the housing 1. The voice coil connecting part 31122 includes a flat part 31123 and a side part 31124. The flat part 31123 is connected to the second folded ring 31125, and the side part 31124 is connected to the second outer connecting part 31121, so that the first folded ring 31112 and the second folded ring 31125 are located in different planes. The voice coil 32 is fixed to the flat part 31123 and / or the side part 31124. The second inner connecting part 31126 is sealed together with the annular connecting area 2131. In this embodiment, the flat portion 31123 is connected to the second folded ring 31125, and the side portion 31124 is connected to the second outer connecting portion 31121, so that the first folded ring 31112 and the second folded ring 31125 are located on different planes. That is, the first folded ring 31112 is located in the gap between the first side magnet 221 and the second side magnet 222, which effectively utilizes the space below the top surface of the central magnetic plate 213 for the vibration of the outer membrane 3111, improving the space utilization rate within the receiving cavity 11. The second folded ring 31125 is located at a different height position than the first folded ring 31112, so that the second folded ring 31125 can effectively utilize the area above the central magnetic plate 213 for vibration. The space utilization rate within the receiving cavity 11 is improved, thereby providing the diaphragm 31 with sufficient vibration space. Compared to the situation where the diaphragm 31 is located outside the receiving cavity 11 and additional space needs to be reserved for its vibration, this embodiment effectively utilizes the space within the receiving cavity 11, allowing the diaphragm 31 located within the receiving cavity 11 to also have sufficient vibration space. Therefore, it is not necessary to set up additional space for the diaphragm 31 to vibrate outside the receiving cavity 11, reducing the space requirement for installing the sound-generating unit 100. At the same time, the diaphragm 31 located outside the receiving cavity 11 would also lead to an increase in overall thickness. This embodiment sets the diaphragm 31 within the receiving cavity 11, which also effectively reduces the thickness of the sound-generating unit 100. It should be noted that by providing a first folding ring 31112 between the first outer connecting part 31111 and the first inner connecting part 31113, the movement of the diaphragm 31 can be controlled and constrained to a certain extent, reducing the probability of distortion or damage to the diaphragm 31 due to excessive movement. Similarly, by providing a second folding ring 31125 between the voice coil connecting part 31122 and the second inner connecting part 31126, the movement of the diaphragm 31 can also be controlled and constrained to a certain extent, reducing the probability of distortion or damage to the diaphragm 31 due to excessive movement.

[0069] In some embodiments, the second folding ring 31125 protrudes away from the second central magnet 212, and is located in the gap between the first side magnet 221 and the first central magnet 211. The opening of the second folding ring 31125 faces the gap between the voice coil 32 and the central magnetic plate 213. In this embodiment, by placing the second folding ring 31125 between the first central magnet 211 and the first side magnet 221, the utilization rate of the space between the first central magnet 211 and the first side magnet 221 is effectively improved. The second folding ring 31125 protrudes away from the second central magnet 212, and the opening of the second folding ring 31125 faces the gap between the voice coil 32 and the central magnetic plate 213, so that the second folding ring 31125 and the flat portion 31123 have more sufficient vibration space.

[0070] Please see Figure 5 In some embodiments, the diaphragm 31 further includes a reinforcing portion 312, which is located between the first side magnet 221 and the second side magnet 222. The reinforcing portion 312 is fixed to the first inner connecting portion 31113 or the second outer connecting portion 31121. By providing the reinforcing portion 312, it is helpful to adjust the acoustic performance of the sound-generating unit 100 through the reinforcing portion 312.

[0071] According to one embodiment of the present invention, the inner edge of the reinforcing part 312 has a bent part 3121 facing the first central magnet 211. By providing the bent part 3121, the strength of the diaphragm 31 is effectively increased, so that the part of the diaphragm 31 that contacts the voice coil 32 is not easily deformed during vibration.

[0072] In some embodiments, the projection of the first central magnet 211 in the first direction is located within the projection of the second central magnet 212 in the first direction. In this embodiment, the projection of the first central magnet 211 in the first direction is located within the projection of the second central magnet 212 in the first direction, thereby forming an annular connecting region 2131 on the top surface of the central magnetic plate 213 and sealingly connecting it with the second inner connecting portion 31126, thus improving the reliability of the sealing connection.

[0073] According to an embodiment of the present invention, a first central magnet 211 and a second central magnet 212 are symmetrically arranged on the upper and lower sides of a central magnetic guide plate 213 along a first direction. That is, the first central magnet 211 and the second central magnet 212 are the same size, and the distance from the center of the first central magnet 211 to the center of the central magnetic guide plate 213 is equal to the distance from the second central magnet 212 to the center of the central magnetic guide plate 213. The inner periphery of the diaphragm 31 is connected to the first central magnet 211 and / or the central magnetic guide plate 213. By symmetrically arranging the first central magnet 211 and the second central magnet 212 on the upper and lower sides of the central magnetic guide plate 213 along the first direction, the flatness of the sound-generating unit 100BL(x) can be effectively improved, thereby significantly improving the acoustic performance of the sound-generating unit 100. Alternatively, the first central magnet 211 and the second central magnet 212 can be the same size, and are arranged opposite each other on both sides of the central magnetic guide plate 213 along a first direction. The inner circumference of the diaphragm 31 is sandwiched between the first central magnet 211 and the central magnetic guide plate 213. This arrangement can also improve the flatness of the sound-generating unit 100BL(x). It should be noted that BL(x) is a function of the relationship between the force on the voice coil 32 in the magnetic field and the displacement of the voice coil 32.

[0074] In some embodiments, there are multiple first-side magnets 221, which are arranged sequentially along the circumference of the first central magnet 211; there are multiple second-side magnets 222, which are arranged sequentially along the circumference of the second central magnet 212, and the multiple first-side magnets 221 and multiple second-side magnets 222 correspond one-to-one along a first direction. In this embodiment, the multiple first-side magnets 221 and multiple second-side magnets 222 correspond one-to-one along the first direction, that is, the multiple first-side magnets 221 and multiple second-side magnets 222 are symmetrically arranged relative to the central plane of the central magnetic guide plate 213 along the first direction, so that the magnetic field lines converge and propagate uniformly at the voice coil 32, thereby improving the BL value, effectively improving the flatness of BL(x), significantly improving the FR (Frequency Response) frequency response curve, and effectively reducing the total harmonic distortion (THD). Please refer to [link to relevant documentation]. Figure 7 , Figure 7In the diagram, L1 represents the frequency response curve of the loudspeaker using the speaker unit 100 of this embodiment, while L2 represents the frequency response curve of a conventional loudspeaker. It is clear from the figure that the frequency response curve of this embodiment is significantly improved compared to that of a conventional loudspeaker. It should be noted that FR refers to the change in output sound pressure level as the loudspeaker receives signals of different frequencies. When a loudspeaker plays a pure single-tone signal (such as a 1kHz sine wave), additional harmonic components are generated due to the nonlinear characteristics of the loudspeaker unit itself (such as the movement of the diaphragm 31, the nonlinearity of the magnetic circuit, etc.). THD is the ratio of the effective value of these harmonic components to the effective value of the original signal, usually expressed as a percentage.

[0075] In some embodiments, the first side magnet 221 is annular, the second side magnet 222 is annular, and the first side magnet 221 and the second side magnet 222 are arranged opposite each other along a first direction. In this embodiment, both the first side magnet 221 and the second side magnet 222 are annular, and the first side magnet 221 and the second side magnet 222 are arranged opposite each other along the first direction, that is, the first side magnet 221 and the second side magnet 222 are symmetrically arranged with respect to the central plane of the central magnetic guide plate 213 along the first direction. The central plane of the central magnetic guide plate 213 passes through the center of the central magnetic guide plate 213, and the first direction is perpendicular to the central plane.

[0076] Please see Figure 4 According to one embodiment of the present invention, the sound-generating unit 100 further includes a centering support 6. Each vibration system 3 is provided with at least one centering support 6. The centering support 6 includes a first connecting portion 61 connected to the voice coil 32, a second connecting portion 62 connected to the housing 1, and a spring arm portion 63 connecting the first connecting portion 61 and the second connecting portion 62. The second side magnet 222 is provided with a clearance space 2221 corresponding to the spring arm portion 63. Specifically, each vibration system 3 is provided with four centering supports 6, which are respectively located at the corners of the voice coil 32. There are multiple second side magnets 222, which are arranged sequentially along the circumference of the second central magnet 212, and clearance spaces 2221 are formed between the multiple second side magnets 222. By providing the centering support 6, the movement direction of the voice coil 32 is restricted, so that it always moves along the first direction, avoiding the phenomenon of tilting or deviating from the track during the vibration of the voice coil 32, thus ensuring the stability of the vibration system 3. It should be noted that the four centering support plates 6 corresponding to each vibration system 3 are electrically connected through the injection-molded pads inside the housing 1 for conductive application.

[0077] Please see Figure 4 and Figure 5In some embodiments, the housing 1 includes a first housing body 12 and a second housing body 13, with the outer edge of the diaphragm 31 sandwiched between the first housing body 12 and the second housing body 13; the sound-generating unit 100 also includes a first magnetic yoke 41 and a second magnetic yoke 42. The first magnetic yoke 41 is disposed on the side of the first housing body 12 away from the second housing body 13. The first housing body 12 has a first clearance hole 121. A first side magnet 221 and a first center magnet 211 are disposed in the first clearance hole 121. The first side magnet 221 and the first center magnet 211 are both fixed to the first magnetic yoke 41. The second magnetic yoke 42 is disposed on the side of the second housing body 13 away from the first housing body 12. The second housing body 13 has a second clearance hole 131. The second side magnet 222 and the second center magnet 212 are both disposed in the second clearance hole 131. The second side magnet 222 and the second center magnet 212 are both fixed to the second magnetic yoke 42. By setting the first magnetic yoke 41 and the second magnetic yoke 42, reliable support is provided for the first central magnet 211, the first side magnet 221, the second central magnet 212, and the second side magnet 222. On the other hand, the magnetic field lines can be effectively guided to converge in the dense area of ​​magnetic field lines and form a magnetic circuit, thereby improving the BL value. Specifically, the first shell body 12 and the second shell body 13 are both annular supports.

[0078] Please see Figures 1 to 3 In some embodiments, the sound-generating unit 100 further includes a first connector 51 and a second connector 52 spaced apart along a second direction on both sides of the housing 1. One end of the first connector 51 is connected to the first magnetic yoke 41, and the other end of the first connector 51 is connected to the second magnetic yoke 42; one end of the second connector 52 is connected to the first magnetic yoke 41, and the other end of the second connector 52 is connected to the second magnetic yoke 42. The connection reliability of the first magnetic yoke 41 and the second magnetic yoke 42 is effectively improved by setting the first connector 51 and the second connector 52. The number of first connectors 51 and the number of second connectors 52 can be multiple, without specific limitation. Setting multiple connectors further enhances the connection reliability of the first magnetic yoke 41 and the second magnetic yoke 42. Specifically, the first connector 51 and the second connector 52 are connecting strips, both of which are metal connectors. The two ends of the first connector 51 are welded to the first magnetic yoke 41 and the second magnetic yoke 42, respectively, and the two ends of the second connector 52 are welded to the first magnetic yoke 41 and the second magnetic yoke 42, respectively.

[0079] This invention also proposes a sound-generating module (not shown in the figure), which includes a housing and the aforementioned sound-generating unit 100, with the sound-generating unit 100 disposed within the housing. The sound-generating module can be applied to electronic devices such as computers, mobile phones, smart wearable devices, laptops, virtual reality devices, augmented reality devices, mixed reality devices, or extended reality devices. The specific structure of the sound-generating unit 100 is as described in the above embodiments. Since this sound-generating module adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0080] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sound-generating monomer, characterized in that, include: A housing, wherein a plurality of receiving cavities are formed inside the housing arranged along a second direction; The magnetic circuit system includes a corresponding receiving cavity housing one magnetic circuit system. Each magnetic circuit system includes a central magnetic circuit and a side magnetic circuit. The central magnetic circuit includes a central magnetic guide plate and a first central magnet and a second central magnet respectively connected to both sides of the central magnetic guide plate along a first direction. The side magnetic circuit includes a first side magnet surrounding the first central magnet and a second side magnet surrounding the second central magnet. The first central magnet and the first side magnet are spaced apart to form a first magnetic gap, and the second central magnet and the second side magnet are spaced apart to form a second magnetic gap. The first direction and the second direction are perpendicular. The vibration system, each of the magnetic circuit systems corresponds to one of the vibration systems, each of the vibration systems includes a ring-shaped diaphragm and a voice coil connected to the diaphragm, the diaphragm and the voice coil are arranged around the central magnetic circuit and the inner periphery of the diaphragm is fixed to the central magnetic circuit, the voice coil is used to drive the diaphragm to vibrate along the first direction; the two ends of the voice coil along the first direction correspond to the first magnetic gap and the second magnetic gap respectively; The sound-generating unit includes a first operating mode, in which at least one of the vibration systems radiates a sound wave of a first phase outward, and at least one other vibration system radiates a sound wave of a second phase outward, wherein the first phase and the second phase are opposite phases.

2. The sound-generating unit as described in claim 1, characterized in that, The sound-generating unit also includes a second working mode. The number of accommodating cavities is two. In the first working mode, the two vibration systems radiate sound waves with opposite phases to the outside. In the second working mode, the two vibration systems radiate sound waves with the same phase to the outside. Alternatively, the sound-generating unit may include a second operating mode in which multiple vibration systems radiate sound waves of the same phase outward.

3. The sound-generating unit as described in claim 1 or 2, characterized in that, The inner periphery of the diaphragm is connected to the side of the central magnetic circuit; And / or, the inner periphery of the diaphragm is connected to the side of the central magnetic circuit, the outer edge of the diaphragm is sealed to the housing, the diaphragm divides the receiving cavity into an independent front cavity and a rear cavity, the first central magnet is located in the front cavity, the second side magnet is located in the rear cavity, and the housing is provided with a sound hole communicating with the front cavity; And / or, the diaphragm includes a first portion connected to a first end of the voice coil and a second portion connected to a side of the voice coil; And / or, the diaphragm includes a first portion connected to a first end of the voice coil and a second portion connected to a side of the voice coil, the top surface of the first portion of the diaphragm does not extend beyond the top surface of the magnetic circuit system, and the second portion of the diaphragm is at least partially located between the first side magnet and the second side magnet.

4. The sound-generating unit as described in claim 1 or 2, characterized in that, Both the first central magnet and the second central magnet are magnetized along the first direction but in opposite directions. The magnetization direction of the first side magnet is parallel to and opposite to the magnetization direction of the first central magnet, and the magnetization direction of the second side magnet is parallel to and opposite to the magnetization direction of the second central magnet. And / or, the side of each first side magnet facing the second side magnet is exposed to the receiving cavity, and the side of each second side magnet facing the first side magnet is exposed to the receiving cavity.

5. The sound-generating unit as described in claim 4, characterized in that, The projected outer contour of the first central magnet in the first direction is located within the projected outer contour of the central magnetic guide plate in the first direction, so that the side of the central magnetic guide plate opposite to the second central magnet forms an annular connection area; each diaphragm includes an annular diaphragm body, and a central hole is provided on the annular diaphragm body. The first central magnet passes through the central hole, the outer edge of the annular membrane body is connected to the shell, and the inner circumference of the annular membrane body is connected to the annular connection area; Alternatively, the inner circumference of the annular membrane body is sandwiched between the annular connecting region and the first central magnet.

6. The sound-generating unit as described in claim 5, characterized in that, The outer edge of the annular diaphragm body is sealed to the housing, and the inner circumference of the annular diaphragm body is sealed to the annular connecting area, so that the annular diaphragm body divides the receiving cavity into an independent front cavity and a rear cavity. The first side magnet and the first center magnet are located in the front cavity, and the voice coil, the central magnetic plate, the second side magnet and the second center magnet are located in the rear cavity.

7. The sound-generating unit as described in claim 6, characterized in that, Each of the aforementioned annular diaphragm bodies includes an inner diaphragm and an outer diaphragm. The outer diaphragm is located between the first side magnet and the second side magnet, and the outer diaphragm includes a first outer connecting portion, a first folded ring, and a first inner connecting portion arranged in sequence around the diaphragm. The inner diaphragm includes a second outer connecting portion, a voice coil connecting portion, a second folded ring, and a second inner connecting portion arranged in sequence around the diaphragm. The first inner connecting portion is sealed to the second outer connecting portion, and the first outer connecting portion is sealed to the housing. The voice coil connecting portion includes a flat portion and a side portion. The flat portion is connected to the second folded ring, and the side portion is connected to the second outer connecting portion, so that the first folded ring and the second folded ring are located in different planes. The voice coil is fixed to the flat portion and / or the side portion, and the second inner connecting portion is sealed to the annular connecting area.

8. The sound-generating unit as described in claim 7, characterized in that, The second folded ring protrudes away from the second central magnet, the second folded ring is located in the gap between the first side magnet and the first central magnet, and the opening of the second folded ring faces the gap between the voice coil and the central magnetic plate; And / or, the diaphragm further includes a reinforcing portion, which is located between the first side magnet and the second side magnet, and the reinforcing portion is fixed to the first inner connecting portion or the second outer connecting portion; And / or, the projection of the first central magnet in the first direction lies within the projection of the second central magnet in the first direction.

9. The sound-generating unit as described in claim 1 or 2, characterized in that, There are multiple first side magnets, which are arranged sequentially along the circumference of the first central magnet; there are multiple second side magnets, which are arranged sequentially along the circumference of the second central magnet, and the multiple first side magnets and multiple second side magnets correspond one-to-one along the first direction. Alternatively, the first side magnet is annular, the second side magnet is annular, and the first side magnet and the second side magnet are arranged opposite each other along the first direction.

10. The sound-generating unit as described in claim 1 or 2, characterized in that, The housing includes a first housing body and a second housing body, with the outer edge of the diaphragm sandwiched between the first housing body and the second housing body; the sound-generating unit also includes a first magnetic yoke and a second magnetic yoke, the first magnetic yoke being disposed on the side of the first housing body away from the second housing body, the first housing body having a first clearance hole, the first side magnet and the first center magnet being disposed in the first clearance hole, the first side magnet and the first center magnet being fixed to the first magnetic yoke, the second magnetic yoke being disposed on the side of the second housing body away from the first housing body, the second housing body having a second clearance hole, the second side magnet and the second center magnet being disposed in the second clearance hole, the second side magnet and the second center magnet being fixed to the second magnetic yoke.

11. The sound-generating unit as described in claim 10, characterized in that, The sound-generating unit further includes a first connector and a second connector spaced apart on both sides of the housing along the second direction. One end of the first connector is connected to the first magnetic yoke, and the other end of the first connector is connected to the second magnetic yoke. One end of the second connector is connected to the first magnetic yoke, and the other end of the second connector is connected to the second magnetic yoke.

12. A sound-generating module, characterized in that, The sound-generating module includes a housing and a sound-generating unit as described in any one of claims 1 to 11, wherein the sound-generating unit is disposed within the housing.

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