A kernel, a speaker module, and an electronic device

Abstract

The present application provides a kernel, a speaker module and an electronic device. The kernel includes a magnetic circuit system. The magnetic circuit system includes a central magnet, an edge magnet, a first central magnetic yoke and a second central magnetic yoke; the edge magnet is arranged around the circumference of the central magnet; the central magnet has a first surface and a second surface opposite to each other along its own thickness direction, the first central magnetic yoke is laminated on the first surface, and a first groove is formed in the middle of the first central magnetic yoke facing the first surface, the second central magnetic yoke is laminated on the second surface, and a second groove is formed in the middle of the second central magnetic yoke facing the second surface; a first protrusion is provided on the first surface, a second protrusion is provided on the second surface, the first protrusion is fitted in the first groove, and the second protrusion is fitted in the second groove. According to the kernel of the present application, the magnetic flux of the magnetic circuit system can be increased, the driving force of the magnetic circuit system on the voice coil can be increased, and the speaker module can have a larger amplitude.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, and particularly to a core, a speaker module, and an electronic device. Background Art

[0002] Currently, electronic devices such as personal computers (PCs), tablets, and mobile phones need to be designed to be thinner and lighter due to consumer demands. At the same time, with the improvement of consumer demands, these electronic devices are also required to achieve a better sound effect experience. The speaker modules in the prior art have poor sound effects and still cannot meet the user's usage requirements. Summary of the Invention

[0003] This application provides a core, a speaker module, and an electronic device, which can improve the audio effect.

[0004] To achieve the above object, the embodiments of this application adopt the following technical solutions:

[0005] In a first aspect, this application provides a core, including a magnetic circuit system. The magnetic circuit system includes a central magnet, an edge magnet, a first central magnetic yoke, and a second central magnetic yoke; the edge magnet is arranged around the central magnet, the magnetization direction of the edge magnet is opposite to that of the central magnet, and a magnetic gap is formed between the edge magnet and the central magnet; the central magnet has a first surface and a second surface opposite to each other along its own thickness direction, the first central magnetic yoke is stacked on the first surface, and a first groove is formed in the middle of the first central magnetic yoke facing the first surface, the second central magnetic yoke is stacked on the second surface, and a second groove is formed in the middle of the second central magnetic yoke facing the second surface; a first protrusion is provided on the first surface, a second protrusion is provided on the second surface, the first protrusion is fitted in the first groove, and the second protrusion is fitted in the second groove.

[0006] According to the core of the embodiments of this application, by providing a first groove on the first central magnetic yoke, a second groove on the second central magnetic yoke, and respectively providing a first protrusion adapted to the first groove and a second protrusion adapted to the second groove on the central magnet, it is beneficial to increase the overall thickness of the central magnet, the first protrusion, and the second protrusion without changing the thickness of the magnetic circuit system, thereby increasing the magnetic flux of the magnetic circuit system, increasing the driving force of the magnetic circuit system on the voice coil, enabling the speaker module to have a larger amplitude, and optimizing the audio performance of the speaker module. In addition, it is also beneficial to reduce the thickness of the middle parts of the first central magnetic yoke and the second central magnetic yoke, thereby at least to a certain extent solving the problem of excessive magnetic conduction ability in the middle parts of the first central magnetic yoke and the second central magnetic yoke, and improving the magnetic conduction efficiency of the middle parts of the first central magnetic yoke and the second central magnetic yoke.

[0007] In an embodiment of the first aspect of the present application, the shape of the second protruding portion is the same as both the shape and size of the first protruding portion. Specifically, the second protruding portion is symmetrically arranged with respect to the central magnet relative to the first protruding portion. With this arrangement, the structure is simple, and it is beneficial to increase the overall thickness of the second protruding portion, the first protruding portion, and the central magnet, thereby increasing the magnetic flux.

[0008] In some embodiments of the first aspect of the present application, in the direction from the center of the first central magnetic yoke to the outer periphery of the first central magnetic yoke, the distance between the wall surface of the first groove and the first surface gradually decreases. In this way, the uniformity of the magnetic saturation degree on the first central magnetic yoke can be further improved, facilitating the transmission of more magnetic lines of force between the voice coil and the magnet, and then increasing the magnetic induction intensity of the magnetic circuit system.

[0009] In some embodiments of the first aspect of the present application, the wall surface of the first groove is a spherical crown surface or a conical surface.

[0010] In some embodiments of the first aspect of the present application, the thickness of the first central magnetic yoke at the first groove is less than the thickness at other positions of the first magnetic yoke. Thereby, the problem of excessive magnetic conduction ability in the middle of the first central magnetic yoke can be solved, improving the magnetic conduction efficiency in the middle of the first central magnetic yoke and the magnetic saturation degree of the first central magnetic yoke corresponding to the first groove.

[0011] In some embodiments of the first aspect of the present application, in the direction from the center of the second central magnetic yoke to the outer periphery of the second central magnetic yoke, the distance between the wall surface of the second groove and the second surface gradually decreases. In this way, the uniformity of the magnetic saturation degree on the second central magnetic yoke can be further improved, facilitating the transmission of more magnetic lines of force between the voice coil and the magnet, and then increasing the magnetic induction intensity of the magnetic circuit system.

[0012] In some embodiments of the first aspect of the present application, the thickness of the second central magnetic yoke at the second groove is less than the thickness at other positions of the second magnetic yoke. Thereby, the problem of excessive magnetic conduction ability in the middle of the second central magnetic yoke can be solved, improving the magnetic conduction efficiency in the middle of the second central magnetic yoke and the magnetic saturation degree of the second central magnetic yoke corresponding to the second groove.

[0013] In some embodiments of the first aspect of the present application, the magnetic circuit system further includes a first edge magnetic yoke; the first edge magnetic yoke is laminated on the surface of the side magnet facing the same direction as the first surface, the first edge magnetic yoke is located on the outer periphery of the first central magnetic yoke and is spaced apart from the first central magnetic yoke; a first mating region is formed on the surface of the first edge magnetic yoke facing the side magnet, the first mating region includes a first region and a second region, the second region is located on the side of the first region away from the first central magnetic yoke, and the second region extends to the side edge of the first edge magnetic yoke away from the first central magnetic yoke, and the distance between the second region and the plane where the central magnet is located is greater than the distance between the first region and the plane where the central magnet is located; a first adaptation region is formed on the surface of the side magnet facing the first edge magnetic yoke, the first adaptation region includes a first sub-adaptation region and a second sub-adaptation region, the second sub-adaptation region is located on the side of the first sub-adaptation region away from the central magnet, the distance between the second sub-adaptation region and the plane where the central magnet is located is greater than the distance between the first sub-adaptation region and the plane where the central magnet is located, the second sub-adaptation region is adapted to the second region, and the first sub-adaptation region is adapted to the first region.

[0014] In the embodiments of the present application, by providing the second region on the surface of the first edge magnetic yoke facing the side magnet, and the distance between the second region and the plane where the central magnet is located is greater than the distance between the first region and the plane where the central magnet is located. In this way, the second region can avoid the second sub-adaptation region, so as to facilitate the setting of the second sub-adaptation region on the side magnet, thereby increasing the thickness of the side magnet corresponding to the second sub-adaptation region, and further facilitating more magnetic force lines corresponding to the second adaptation region on the side magnet to participate in the driving of the voice coil, improving the magnetic induction intensity of the magnetic circuit system, and improving the driving force of the magnetic circuit system on the voice coil.

[0015] In some embodiments of the first aspect of the present application, the thickness of the first edge magnetic yoke at the first region is greater than that of the first edge magnetic yoke, and the thickness of the side magnet at the second sub-adaptation region is greater than the thickness of the side magnet at the first sub-adaptation region. At the thickness of the second region. In this way, it can be realized that without changing the external dimensions of the magnetic circuit system, by reducing the thickness of the second region on the first edge magnetic yoke, the magnetic conduction efficiency of the first edge magnetic yoke can be improved, and at the same time, the purpose of increasing the thickness of the side magnet at the second sub-adaptation region can be achieved, which is conducive to more magnetic force lines corresponding to the second sub-adaptation region on the side magnet to participate in the driving of the voice coil, improving the magnetic induction intensity of the magnetic circuit system, and improving the driving force of the magnetic circuit system on the voice coil.

[0016] In some embodiments of the first aspect of the present application, the width dimension of the first region is d, and the thickness dimension of the first edge magnetic yoke corresponding to the first region is h, where d and h satisfy: d≥0.5h. In this way, the width dimension of the first region can be combined with the thickness dimension of the first region on the first edge magnetic yoke to optimize the structure of the first edge magnetic yoke and improve the magnetic conduction efficiency of the first edge magnetic yoke.

[0017] In some embodiments of the first aspect of the present application, in the direction from the center of the first central magnetic yoke to the outer periphery of the first central magnetic yoke, the second region extends obliquely away from the plane where the central magnet is located from the first region. This is beneficial for utilizing the change in the shape of the side magnet, enabling more magnetic field lines corresponding to the second sub-adaptive region on the side magnet to participate in driving the voice coil, increasing the magnetic induction intensity of the magnetic circuit system, and enhancing the driving force of the magnetic circuit system on the voice coil.

[0018] In some embodiments of the first aspect of the present application, the side magnet includes a first side magnet, a second side magnet, a third side magnet, and a fourth side magnet spaced apart; the first side magnet and the second side magnet are respectively disposed on opposite sides of the central magnet, the third side magnet and the fourth side magnet are respectively disposed on the other opposite sides of the central magnet, and the arrangement directions of the third side magnet and the fourth side magnet are perpendicular to the arrangement directions of the first side magnet and the second side magnet; the first edge magnetic yoke includes: a first sub-edge magnetic yoke, a second sub-edge magnetic yoke, a third sub-edge magnetic yoke, and a fourth sub-edge magnetic yoke spaced apart, the first sub-edge magnetic yoke is adapted to the first side magnet, the second sub-edge magnetic yoke is adapted to the second side magnet, the third sub-edge magnetic yoke is adapted to the third side magnet, the fourth sub-edge magnetic yoke is adapted to the fourth side magnet, and first mating regions are respectively formed on the first sub-edge magnetic yoke and the second sub-edge magnetic yoke.

[0019] In some embodiments of the first aspect of the present application, the inner core further includes a chassis, a voice coil, and an electrical connector; the magnetic circuit system is fixed on the surface of the chassis that faces the same direction as the second surface, the voice coil is located inside the chassis, and a part of the voice coil extends into the magnetic gap; the chassis is in a rectangular frame shape, the chassis includes a first short side portion and a second short side portion disposed opposite to each other, the extending directions of the first short side portion and the second short side portion are the same as the arrangement directions of the third side magnet and the fourth side magnet, and the electrical connector electrically connects the voice coil and is fixed between the first short side portion and the voice coil.

[0020] In some embodiments of the first aspect of the present application, the voice coil is in a rectangular frame shape, and the extending directions of two adjacent side portions of the voice coil are respectively the same as the length direction and the width direction of the chassis; the electrical connector has two first end portions, and the two first end portions of the electrical connector are respectively connected to two corner positions of the voice coil adjacent to the first short side portion.

[0021] In some embodiments of the first aspect of the present application, the electrical connector has two second ends, and the two second ends of the electrical connector are respectively disposed at two ends of the first short side portion, and the two second ends are respectively electrically connected to the two first ends in one-to-one correspondence.

[0022] In some embodiments of the first aspect of the present application, the electrical connector includes two electrical connection units, and the two electrical connection units are spaced apart in the extending direction of the first short side portion. Each electrical connection unit has a first end and a second end, and the first end and the second end of each electrical connection unit are electrically connected; the first short side portion faces the first sub-edge magnetic yoke, and a portion of the first sub-edge magnetic yoke located between the two electrical connection units is fixed to the surface of the first short side portion that faces the same direction as the second surface. By making the electrical connector include two spaced-apart electrical connection units, on the one hand, the positive and negative poles of the inner core can be completely spaced apart, improving the reliability of the electrical connection between the inner core and the electrical connection structure; on the other hand, it is convenient to fix the portion of the first sub-edge magnetic yoke located between the two electrical connection units to the bottom surface of the first short side portion, thereby improving the reliability of the connection between the chassis and the magnetic circuit system.

[0023] In some embodiments of the first aspect of the present application, avoiding notches are respectively formed at two ends of the first sub-edge magnetic yoke along the extending direction of the first short side portion, and the avoiding notches extend to the side edge of the first sub-edge magnetic yoke away from the second sub-edge magnetic yoke. At least portions of the surface of the first side magnet facing the first sub-edge magnetic yoke that are opposite to the two avoiding notches respectively form avoiding regions, and each avoiding notch and the avoiding region at the corresponding position define an avoiding space for avoiding the electrical connection unit at the corresponding position. In the embodiments of the present application, by providing an avoiding space on the magnetic circuit system to avoid the electrical connection unit with the avoiding space, on the one hand, it is beneficial to increase the size of the electrical connection unit and improve the deformation ability of the electrical connection unit; on the other hand, it can avoid the interference of the magnetic circuit system on the movement of the electrical connection unit.

[0024] In some embodiments of the first aspect of the present application, along the extending direction of the first short side portion, the first mating region on the first sub-edge magnetic yoke is located between the two avoiding notches.

[0025] In some embodiments of the first aspect of the present application, the first sub-edge magnetic yoke includes a first portion, a second portion, and a third portion. The first portion, the second portion, and the third portion are arranged in sequence and connected along the extending direction of the first short side portion. The surface of the second portion facing the side magnet is formed as the first mating region, and one end of the second portion away from the first central magnetic yoke respectively extends beyond the first portion and the third portion in the direction away from the first central magnetic yoke to respectively define two avoiding notches with the first portion and the third portion.

[0026] In some embodiments of the first aspect of the present application, the surface of the edge magnet facing the third part, the surface of the edge magnet facing the first part, and the first region on the second part are coplanar.

[0027] In some embodiments of the first aspect of the present application, first mating regions are respectively formed on the third sub-edge magnetic yoke and the fourth sub-edge magnetic yoke.

[0028] In some embodiments of the first aspect of the present application, the surface of the first edge magnetic yoke facing away from the edge magnet and the surface of the first central magnetic yoke facing away from the central magnet are coplanar. Such an arrangement is beneficial to improving the structural compactness of the magnetic circuit system, and the structural layout of the magnetic circuit system is more reasonable, which is beneficial to improving the driving force of the magnetic circuit system on the voice coil.

[0029] In some embodiments of the first aspect of the present application, the magnetic circuit system further includes: a second edge magnetic yoke, which is provided on the surface of the edge magnet facing the same direction as the second surface and is located on the outer periphery of the second central magnetic yoke; a second mating region is formed on the surface of the second edge magnetic yoke facing the edge magnet, and the second mating region includes a connected third region and a fourth region. The third region extends to one side edge of the second edge magnetic yoke close to the first central magnetic yoke, and the fourth region is located on the side of the third region away from the second central magnetic yoke. The distance between the fourth region and the plane where the central magnet is located is greater than the distance between the third region and the plane where the central magnet is located; a second adaptation region is formed on the surface of the edge magnet facing the second edge magnetic yoke, and the second adaptation region includes a third sub-adaptation region and a fourth sub-adaptation region. The fourth sub-adaptation region is located on the side of the third sub-adaptation region away from the central magnet, and the distance between the fourth sub-adaptation region and the plane where the central magnet is located is greater than the distance between the third sub-adaptation region and the plane where the central magnet is located. The fourth sub-adaptation region is adapted to the fourth region, and the third sub-adaptation region is adapted to the third region. In this way, the fourth region can avoid the fourth sub-adaptation region, so as to facilitate the setting of the fourth sub-adaptation region on the edge magnet, thereby increasing the thickness of the edge magnet corresponding to the fourth sub-adaptation region, and further facilitating more magnetic field lines on the edge magnet corresponding to the fourth sub-adaptation region to participate in the driving of the voice coil, improving the magnetic induction intensity of the magnetic circuit system, and improving the driving force of the magnetic circuit system on the voice coil.

[0030] In some embodiments of the first aspect of the present application, the width dimension of the third region is m, and the thickness dimension of the first edge magnetic yoke corresponding to the first region is n, and m and n satisfy: m≥0.5n. In this way, the width dimension of the first region can be combined with the thickness dimension of the first region on the first edge magnetic yoke to optimize the structure of the first edge magnetic yoke and improve the magnetic conduction efficiency of the first edge magnetic yoke.

[0031] In some embodiments of the first aspect of the present application, in the direction from the center of the second central magnetic yoke to the outer periphery of the second central magnetic yoke, the fourth region extends obliquely away from the plane where the central magnet is located with respect to the third region. This is beneficial for utilizing the change in the shape of the side magnets, enabling more magnetic lines of force of the side magnets to participate in driving the voice coil, increasing the magnetic induction intensity of the magnetic circuit system, and enhancing the driving force of the magnetic circuit system on the voice coil.

[0032] In some embodiments of the first aspect of the present application, the side magnets include a spaced-apart first side magnet and a second side magnet; the first side magnet and the second side magnet are respectively disposed on opposite sides of the central magnet; at least portions of the second edge magnetic yoke respectively facing the first side magnet and the second side magnet are respectively formed with second mating regions.

[0033] In some embodiments of the first aspect of the present application, the side magnets include a spaced-apart third side magnet and a fourth side magnet; the third side magnet and the fourth side magnet are respectively disposed on other opposite sides of the central magnet, and the arrangement directions of the third side magnet and the fourth side magnet are perpendicular to the arrangement directions of the first side magnet and the second side magnet. At least portions of the second edge magnetic yoke respectively facing the third side magnet and the fourth side magnet are respectively formed with second mating regions.

[0034] In some embodiments of the first aspect of the present application, the second edge magnetic yoke is in a rectangular ring shape, and second mating regions are formed on the entire surface of the second edge magnetic yoke facing the side magnets.

[0035] In some embodiments of the first aspect of the present application, the second edge magnetic yoke is connected to the second central magnetic yoke through a connecting magnetic yoke portion, wherein the connecting magnetic yoke portion faces the magnetic gap.

[0036] In some embodiments of the first aspect of the present application, the thickness of the connecting magnetic yoke portion, the thickness of the second edge magnetic yoke at the third region, and the thickness of the portion of the second central magnetic yoke without the second groove are equal. In this way, the magnetic current intensity can be further increased, and the magnetic conduction effect of the second magnetic yoke can be improved.

[0037] In some embodiments of the first aspect of the present application, the surface of the second edge magnetic yoke facing away from the side magnets and the surface of the second central magnetic yoke facing away from the central magnet are coplanar.

[0038] Second aspect, the present application also proposes another kind of core, including: a magnetic circuit system, the magnetic circuit system includes a central magnet, side magnets and a first central magnetic yoke; the side magnets are arranged around the circumference of the central magnet, the magnetization direction of the side magnets is opposite to that of the central magnet, and a magnetic gap is formed between the side magnets and the central magnet; the central magnet has a first surface on one side in its own thickness direction, the first central magnetic yoke is stacked on the first surface, and a first convex portion is formed at the edge of the surface of the first central magnetic yoke facing away from the central magnet, and the first convex portion extends in the entire circumference of the first central magnetic yoke. In this way, the thickness at the edge of the first central magnetic yoke can be increased, so that the magnetic saturation limit at the edge of the first central magnetic yoke can be increased. In this way, more magnetic flux lines can be guided to the voice coil by the first central magnetic yoke, the magnetic flux of the magnetic circuit system can be increased, and thus the driving force of the magnetic circuit system on the voice coil can be increased, so that the speaker module has a larger amplitude, and the audio performance of the speaker module is optimized.

[0039] In some embodiments of the second aspect of the present application, the magnetic circuit system includes a first edge magnetic yoke, the first edge magnetic yoke is stacked on the surface of the side magnet facing the same direction as the first surface, the first edge magnetic yoke is located outside the first central magnetic yoke and is separated from the first central magnetic yoke; a second convex portion is formed at a part of the surface of the first edge magnetic yoke facing away from the side magnet and adjacent to the second central magnetic yoke.

[0040] In some embodiments of the second aspect of the present application, the magnetic circuit system further includes a second central magnetic yoke; the central magnet has a second surface opposite to the first surface, the second central magnetic yoke is stacked on the second surface, and a third convex portion is formed at the edge of the surface of the second central magnetic yoke facing away from the central magnet, and the third convex portion extends in the entire circumference of the second central magnetic yoke. In this way, the thickness at the edge of the second central magnetic yoke can be increased, so that the magnetic saturation limit at the edge of the second central magnetic yoke can be increased. In this way, more magnetic flux lines can be guided to the voice coil by the second central magnetic yoke, the magnetic flux of the magnetic circuit system can be increased, and thus the driving force of the magnetic circuit system on the voice coil can be increased, so that the speaker module has a larger amplitude, and the audio performance of the speaker module is optimized.

[0041] In some embodiments of the second aspect of the present application, the magnetic circuit system further includes a second edge magnetic yoke, which is disposed on a surface of the edge magnet that faces the same direction as the second surface and is located at the periphery of the second center magnetic yoke; a fourth convex portion is formed on a portion of the second edge magnetic yoke that is adjacent to the second center magnetic yoke and that faces away from the edge magnet. This can increase the thickness of the second edge magnetic yoke at a position adjacent to the voice coil, thereby increasing the magnetic saturation limit at the edge of the second edge magnetic yoke, so that the second edge magnetic yoke can be used to guide more magnetic lines of force to the voice coil, thereby increasing the magnetic flux of the magnetic circuit system, thereby increasing the driving force of the magnetic circuit system on the voice coil, so that the speaker module has a larger amplitude, and the audio performance of the speaker module is optimized.

[0042] On the third aspect, the present application provides a speaker module, comprising a shell and a core of any of the above-mentioned technical solutions, the core is arranged in the shell, and the shell is divided into a front cavity and a rear cavity by the diaphragm group of the core, the voice coil and magnetic circuit system of the core are both located in the rear cavity, and a sound output channel is provided on the shell, and the front cavity is connected to the sound output channel.

[0043] Since the speaker module provided in the embodiment of the present application includes the core of any of the above embodiments, the two can solve the same technical problems and achieve the same effects.

[0044] In a fourth aspect, the present application provides an electronic device, comprising a housing, a main board and the above-mentioned speaker module, wherein the main board and the speaker module are arranged in the housing, and the speaker module is electrically connected to the main board, a sound outlet hole is provided on the housing, and a sound outlet channel is connected to the sound outlet hole.

[0045] Since the electronic devices provided in some embodiments of the present application include the above-mentioned speaker module, and since the electronic devices provided in some embodiments of the present application include the speaker module of the above-mentioned embodiments, both can solve the same technical problems and achieve the same effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic diagram of the structure of an electronic device provided in some embodiments of the present application;

[0047] Figure 2 for Figure 1 An exploded schematic diagram of the electronic device shown in ;

[0048] Figure 3 Based on Figure 2 A structural schematic diagram of a speaker module of an electronic device shown in ;

[0049] Figure 4 Based on Figure 3 A schematic diagram of the cross-sectional structure of the speaker module at line AA shown in FIG.

[0050] Figure 5 Stereogram of the kernel provided by some embodiments of the present application;

[0051] Figure 6 According to Figure 5 Exploded view of the kernel shown;

[0052] Figure 7 According to Figures 5 - 6 Stereogram of the chassis shown in;

[0053] Figure 8 According to Figure 5 Schematic cross-sectional structure diagram of the diaphragm group and the chassis in cooperation and along line B-B;

[0054] Figure 9 According to Figure 5 Schematic diagram of the cooperation of the diaphragm group, voice coil and chassis shown;

[0055] Figure 10 According to Figure 5 Schematic cross-sectional structure diagram of the kernel along line B-B;

[0056] Figure 11 According to Figure 5 Exploded view of the magnetic circuit system shown;

[0057] Figure 12 According to Figures 5 - 6 Schematic diagram of the magnetic field line emission of the kernel shown in;

[0058] Figure 13 Schematic structure diagram of the magnetic circuit system of some other embodiments of the present application;

[0059] Figure 14 According to Figure 13 Schematic exploded cross-sectional structure diagram of the magnetic circuit system along line C-C;

[0060] Figure 15 According to Figure 13 Schematic cross-sectional cooperation structure diagram of the magnetic circuit system along line C-C;

[0061] Figure 16 According to Figure 13 Schematic structure diagram of the first edge magnetic yoke shown;

[0062] Figure 17 According to Figure 13 Schematic structure diagram of the side magnet shown;

[0063] Figure 18 According to Figure 13 Schematic cooperation diagram of the side magnet and the first edge magnetic yoke shown;

[0064] Figure 19 is a schematic structural view of the second magnetic yoke in the magnetic circuit system shown in Figure 13 ;

[0065] Figure 20 is a schematic view of the cooperation of the second magnetic yoke, the side magnet and the first edge magnetic yoke in the magnetic circuit system shown in Figure 13 ;

[0066] Figure 21 is a schematic view of the cooperation of the magnetic circuit system, the chassis, the voice coil, the electrical connector and the counterweight balance unit shown in Figure 13 ;

[0067] Figure 22 is a schematic view of the cooperation of the magnetic circuit system, the voice coil, the electrical connector and the counterweight balance unit shown in Figure 13 ;

[0068] Figure 23 is a schematic view of the magnetic force line emission of the magnetic circuit system shown in Figure 13 ;

[0069] Figure 24 is a schematic cross-sectional structure view of the magnetic circuit system according to some other embodiments of the present application;

[0070] Figure 25 is a schematic cross-sectional structure view of the magnetic circuit system according to some more other embodiments of the present application;

[0071] Figure 26 is a schematic cross-sectional structure view of the magnetic circuit system according to some other embodiments of the present application;

[0072] Figure 27 is a schematic cross-sectional structure view of the magnetic circuit system according to some more other embodiments of the present application;

[0073] Figure 28 is a schematic cross-sectional structure view of the magnetic circuit system according to some other different embodiments of the present application. Detailed Embodiments

[0074] In the embodiments of the present application, the terms "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of such features.

[0075] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, "connected" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected and the relative position relationship after connection remains unchanged. "Rotational connection" means that the two are connected and can rotate relative to each other after connection. "Sliding connection" means that the two are connected and can slide relative to each other after connection.

[0076] The orientation terms mentioned in the embodiments of the present application, such as "inside", "outside", etc., are only for reference to the direction of the accompanying drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the embodiments of the present application. In addition, unless otherwise specified in the present application, the term "plurality" as used herein means two or more.

[0077] In the description of the embodiments of the present application, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element.

[0078] In the embodiments of the present application, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0079] The present application provides an electronic device, which is a type of electronic device with a speaker module. Specifically, the electronic device includes but is not limited to mobile phones, tablet personal computers, laptop computers, personal digital assistants (PDAs), personal computers, notebook computers, in-vehicle devices, wearable devices, walkmans, radios, televisions, speakers, etc. Among them, wearable devices include but are not limited to smart bracelets, smart watches, smart head-mounted displays, smart glasses, etc.

[0080] Please refer toFigures 1 - 2 , Figure 1 is a schematic structural diagram of the electronic device 100 provided for some embodiments of the present application. Figure 2 is Figure 1 an exploded schematic diagram of the electronic device 100 shown in. In the embodiments of the present application, the electronic device 100 is a mobile phone. Specifically, the electronic device 100 may include a housing 10, a screen 20, a main control motherboard 30, an interface motherboard 40, a connection structure 50, a battery 60, and a speaker module 80.

[0081] It should be noted that Figure 1 and Figure 2 and the relevant drawings hereinafter only schematically show some components included in the electronic device 100, and the actual shapes, actual sizes, actual positions, and actual structures of these components are not limited by Figure 1 and Figure 2 and the respective drawings hereinafter. In addition, when the electronic device 100 is an electronic device in some other forms, the electronic device 100 may also not include the interface motherboard 40, the connection structure 50, the screen 20, and the battery 60.

[0082] In Figure 1 and Figure 2 the shown embodiments, the electronic device 100 is in the shape of a rectangular flat plate. For the convenience of describing the following embodiments, an XYZ coordinate system is established. Specifically, the width direction of the electronic device 100 is defined as the X-axis direction, the length direction of the electronic device 100 is defined as the Y-axis direction, the thickness direction of the electronic device 100 is defined as the Z-axis direction, and the X-axis, Y-axis, and Z-axis are perpendicular to each other. It can be understood that the coordinate system setting of the electronic device 100 can be flexibly set according to actual needs and is not specifically limited herein. In some other embodiments, the shape of the electronic device 100 may also be a square flat plate, a rhombic flat plate, a circular flat plate, an elliptical flat plate, an oblong flat plate, a triangular flat plate, or a special-shaped flat plate, etc.

[0083] The screen 20 is used to display images, videos, etc. Please refer to Figure 2 , the screen 20 includes a light-transmitting cover plate 21 and a display screen 22 (English name: panel, also known as a display panel). The light-transmitting cover plate 21 and the display screen 22 are stacked. Specifically, the light-transmitting cover plate 21 and the display screen 22 can be fixedly connected by means of glue or the like. The light-transmitting cover plate 21 is mainly used to protect the display screen 22 and prevent dust. The material of the light-transmitting cover plate 21 includes but is not limited to glass, ceramic, and plastic.

[0084] The display screen 22 can be a flexible display screen or a rigid display screen. For example, the display screen 22 can be an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode (AMOLED) display screen, a mini organic light-emitting diode display screen, a micro organic light-emitting diode display screen, a micro organic light-emitting diode display screen, a quantum dot light emitting diodes (QLED) display screen, or a liquid crystal display (LCD), and so on.

[0085] The housing 10 is used to protect the internal electronic components of the electronic device 100. Please continue to refer to Figures 1 - 2 , the housing 10 includes a back cover 12 and a frame 11. The back cover 12 is located on the side of the display screen 22 away from the light-transmitting cover plate 21, and the back cover 12, the light-transmitting cover plate 21, and the display screen 22 are stacked. The frame 11 is located between the back cover 12 and the light-transmitting cover plate 21, and the frame 11 is fixed to the back cover 12. Exemplarily, the frame 11 can be fixedly connected to the back cover 12 by means of glue, snap connection, welding, or screw connection. The frame 11 and the back cover 12 can also be an integrally formed structure, that is, the frame 11 and the back cover 12 are a whole structure, so that the connection strength between the frame 11 and the back cover 12 is relatively high. The material of the back cover 12 includes but is not limited to metal, ceramic, plastic, and glass. In order to achieve the thin and light of the electronic device 100 while ensuring the structural strength of the back cover 12, the material of the back cover 12 can be selected as metal. The material of the frame 11 includes but is not limited to metal, ceramic, plastic, and glass. The material of the frame 11 can be the same as that of the back cover 12, or of course different.

[0086] In some embodiments, the light-transmitting cover plate 21 is fixed to the frame 11. Specifically, the light-transmitting cover plate 21 can be fixed to the frame 11 by gluing. The light-transmitting cover plate 21, the back cover 12, and the frame 11 enclose the internal accommodation space of the electronic device 100. The internal accommodation space houses the display screen 22, the main control motherboard 30, the interface motherboard 40, the connection structure 50, the battery 60, and the speaker module 80.

[0087] The main control motherboard 30 is used to integrate the main control chip. The main control motherboard 30 can be fixed on the surface of the display screen 22 close to the back cover 12. Exemplarily, the main control motherboard 30 can be fixed on the surface of the display screen 22 close to the back cover 12 by means of threaded connection, snap connection, gluing or welding, etc. In other embodiments, please refer to Figure 2 , the housing 10 further includes a middle plate 13. The middle plate 13 is fixed on the inner circumferential surface of the frame 11. Exemplarily, the middle plate 13 can be fixed on the frame 11 by means of welding, threaded connection, snap connection or gluing, etc. The middle plate 13 can also be an integrally formed structure with the frame 11. The material of the middle plate 13 includes but is not limited to metal, ceramic, plastic and glass. The material of the middle plate 13 can be the same as that of the back cover 12, or of course different. The middle plate 13 serves as the structural "skeleton" of the electronic device 100, and the main control motherboard 30 can be fixed on the surface of the middle plate 13 facing the back cover 12 by means of threaded connection, snap connection, welding, etc.

[0088] The main control chip can be, for example, an application processor (AP), a double data rate synchronous dynamic random access memory (DDR), and a universal flash storage (UFS), etc. In some embodiments, the main control motherboard 30 is electrically connected to the screen 20, and the main control motherboard 30 is used to control the screen 20 to display images or videos.

[0089] The main control motherboard 30 can be a rigid circuit board, a flexible circuit board, or a rigid-flex circuit board. The main control motherboard 30 can use an FR-4 dielectric board, a Rogers dielectric board, or a hybrid dielectric board of FR-4 and Rogers, etc. Here, FR-4 is a code for a flame-retardant material grade, and the Rogers dielectric board is a high-frequency board.

[0090] The interface motherboard 40 is fixed in the internal accommodation space of the electronic device 100. The interface motherboard 40 and the main control motherboard 30 are arranged in the Y-axis direction. The interface motherboard 40 can be fixed on the surface of the middle plate 13 facing the back cover 12. Specifically, the interface motherboard 40 can be fixed on the surface of the middle plate 13 facing the back cover 12 by means of threaded connection, snap connection, gluing or welding, etc. In other embodiments, when the housing 10 does not include the middle plate 13, the interface motherboard 40 can also be fixed on the surface of the display screen 22 on the side facing the back cover 12. Specifically, the interface motherboard 40 can be fixed on the surface of the display screen 22 on the side facing the back cover 12 by means of threaded connection, snap connection, gluing or welding, etc.

[0091] The interface main board 40 can be a rigid circuit board, a flexible circuit board, or a rigid-flex circuit board. The interface main board 40 can use an FR-4 dielectric board, a Rogers dielectric board, or a hybrid dielectric board of FR-4 and Rogers, and so on.

[0092] The interface main board 40 is electrically connected to the main control main board 30 through a connection structure 50 to achieve data and signal transmission between the interface main board 40 and the main control main board 30. Among them, the connection structure 50 can be a flexible printed circuit (FPC). In other embodiments, the connection structure 50 can also be a wire or an enameled wire.

[0093] A universal serial bus (USB) device is integrated on the interface main board 40. The USB device 70 can be a USB Type-C interface device, a USB Type-A interface device, a USB Type Micro-B interface device, or a USB Type-B interface device. A socket 11b is provided on the frame 11 at the position corresponding to the USB device 70. Accessories such as chargers, headphones, and data cables can be electrically connected to the USB device 70 through the socket 11b to achieve power supply, signal, and data transmission.

[0094] The battery 60 is fixed inside the accommodation space of the electronic device 100. The battery 60 is located between the main control main board 30 and the interface main board 40. The battery 60 is used to supply power to the main control main board 30, the interface main board 40, the screen 20, the speaker module 80, and so on. In some embodiments, please refer to Figure 2 , an installation groove 13a is provided on the surface of the middle plate 13 facing the back cover 12, and the battery 60 is installed in the installation groove 13a. In other embodiments, when the housing 10 does not include the middle plate 13, the installation groove 13a can also be defined by the surfaces of the main control main board 30, the interface main board 40, and the display screen 22 facing the back cover 12.

[0095] The speaker module 80 is used to restore audio electrical signals such as music and voice into sounds, so that the electronic device 100 can support audio external playback. In some embodiments, the speaker module 80 is electrically connected to at least one of the main control main board 30 and the interface main board 40. In some embodiments, the speaker module 80 is electrically connected to the interface main board 40. At this time, the voice electrical signal sent by the main control main board 30 is transmitted to the speaker module 80 through the interface main board 40, and is further converted into a sound signal and output through the speaker module 80. Specifically, please refer to Figure 2, the speaker module 80 has a sound output channel 80a. The sound signal output by the speaker module 80 is output through the sound output channel 80a. An acoustic hole 11a is provided on the frame 11. The acoustic hole 11a is in communication with the sound output channel 80a. The sound signal output through the sound output channel 80a is further output to the outside of the electronic device 100 through the acoustic hole 11a. In other embodiments, the speaker module 80 can also be directly electrically connected to the main control motherboard 30 through an FPC, a wire, an enameled wire, etc.

[0096] The speaker module 80 is fixed within the internal accommodation space of the electronic device 100. Please continue to refer to Figure 2 , the speaker module 80 is located on a side of the battery 60 away from the main control motherboard 30. The speaker module 80 and the interface motherboard 40 are arranged side by side in the XY plane, and a part of the speaker module 80 and the interface motherboard 40 are arranged in the X-axis direction. Another part of the speaker module 80 and the interface motherboard 40 are arranged in the Y-axis direction.

[0097] In this embodiment, the speaker module 80 can be used as a low-frequency speaker, can also be used as a medium-frequency or high-frequency speaker, and can also be used as a low-medium-high-frequency speaker at the same time.

[0098] Please refer to Figure 3 and Figure 4 , Figure 3 is a schematic structural diagram of the speaker module 80 of the electronic device 100 shown in Figure 2 , Figure 4 is a schematic cross-sectional structural diagram at the A-A line of the speaker module 80 shown in Figure 3 . It should be noted that "at the A-A line" refers to the plane at the A-A line and the planes where the arrows at both ends of the A-A line are located. The same understanding should be made for the descriptions of similar drawings in the following text, and it will not be repeated hereinafter. In this embodiment, the speaker module 80 includes a housing 81, a core 82, and an electrical connection structure 83.

[0099] It should be noted that Figures 3 - 4 only schematically shows some components included in the speaker module 80, and the actual shapes, actual sizes, actual positions, and actual structures of these components are not limited by Figures 3 - 4 . In addition, Figure 3 the coordinate system in Figure 1 is represented as the same coordinate system as Figure 3 . That is, Figure 3 the orientation relationship of each component within the speaker module 80 in the coordinate system shown in Figure 1 is the same as the orientation relationship of each component within it in the coordinate system shown in Figure 1 when the speaker module 80 is applied to the electronic device 100 shown in

[0100] The housing 81 is used to support and fix the core 82, and the housing 81 and the core 82 cooperate to enclose the front cavity C1 and the rear cavity C2 of the speaker module 80. The sound outlet channel 80a is formed on the housing 81 and communicates with the front cavity C1.

[0101] The material of the housing 81 includes but is not limited to metal, plastic, or a combination of metal and plastic. In some embodiments, the material of the housing 81 is plastic, which has low cost and is easy to mold, facilitating the reduction of the processing cost of the speaker module 80.

[0102] The housing 81 can be a single structural entity or assembled from multiple parts. Such an arrangement is conducive to reducing the molding difficulty and assembly difficulty of the housing 81.

[0103] The core 82 is located inside the housing 81. A wire passing hole (not shown in the figure) can be formed on the housing 81. One end of the electrical connection structure 83 extends into the housing 81 through the wire passing hole and is electrically connected to the core 82, and the end of the electrical connection structure 83 located outside the housing 81 is electrically connected to at least one of the main control motherboard 30 and the interface motherboard 40.

[0104] The electrical connection structure 83 includes but is not limited to a flexible printed circuit (FPC), a wire, an enameled wire, and a structure formed by connecting multiple wires through a flexible structure. In Figures 3 - 4 the illustrated embodiment, the electrical connection structure 83 is a flexible printed circuit.

[0105] When the core 82 is powered on and working, it can push the air in the front cavity C1 to vibrate to form sound, thereby converting the audio electrical signal into a sound signal, and this sound can be transmitted to the outside of the housing 81 through the sound outlet channel 80a. Among them, the core 82 is the core component that generates sound in the speaker module 80, and its thickness and audio performance directly affect the thickness and audio performance of the speaker module 80. Therefore, the structure of the core 82 will be mainly introduced below.

[0106] Please refer to Figure 5 and Figure 6 , Figure 5 which is a perspective view of the core 82 provided in some embodiments of the present application, Figure 6 and Figure 5 is an exploded view of the core 82 shown in

[0107] It should be noted that Figures 5 - 6 only schematically shows some components included in the core 82, and the actual shapes, actual sizes, actual positions, and actual structures of these components are not limited by Figures 5 - 6 . Additionally, Figure 5 the coordinate system inFigure 3 The coordinate systems in Figure 5 are represented as the same coordinate system. That is, Figure 5 the orientation relationships of the various components within the core 82 in the Figure 3 coordinate system shown are the same as those of the various components within it when the core 82 is applied to Figure 3 the coordinate system shown within the loudspeaker module 80.

[0108] The chassis 821 serves as the "support framework" of the core 82, and is used to support the diaphragm assembly 822, the voice coil 823, and fix the magnetic circuit system 824. The material of the chassis 821 includes but is not limited to metal, plastic, and combinations of both.

[0109] Please refer to Figure 7 , Figure 7 which is a perspective view of the chassis 821 shown in Figures 5 - 6 . The chassis 821 is in the shape of a rectangular frame. The chassis 821 includes opposite first short side portions 821a and second short side portions 821b, and opposite first long side portions 821c and second long side portions 821d. The extending directions of the first long side portion 821c and the second long side portion 821d are parallel to the X-axis, and the first long side portion 821c and the second long side portion 821d are spaced apart in the Y-axis direction. The extending directions of the first short side portion 821a and the second short side portion 821b are parallel to the Y-axis, and the first short side portion 821a and the second short side portion 821b are spaced apart in the X-axis direction. The lengths of the first long side portion 821c and the second long side portion 821d are greater than the lengths of the first short side portion 821a and the second short side portion 821b. The chassis 821 is formed by sequentially connecting and enclosing the first short side portion 821a, the first long side portion 821c, the second short side portion 821b, and the second long side portion 821d. It can be understood that the shape of the chassis 821 is not limited to a rectangular frame, and the chassis 821 can also be formed into other shapes. For example, the chassis 821 is in the shape of an annular frame, an oblong annular frame, or an elliptical annular frame.

[0110] Please continue to refer to Figure 7 , the chassis 821 has opposite top surface 821e and bottom surface 821f. The top surface 821e of the chassis 821 refers to the part close to the front cavity C1 when the core 82 is applied to the loudspeaker module 80, and the bottom surface 821f of the chassis 821 refers to the part far from the front cavity C1 when the core 82 is applied to the loudspeaker module 80. The top surface 821e and the bottom surface 821f of the chassis 821 are both annular surfaces arranged circumferentially around the chassis 821.

[0111] The basin frame 821 can be an integral structural member, which is beneficial to improving the structural strength of the basin frame 821. Of course, the present application is not limited to this, and the basin frame 821 can also be formed by assembling multiple parts. In this way, it is beneficial to reduce the processing difficulty and forming difficulty of the basin frame 821. The multiple parts of the basin frame 821 can be assembled by means such as bonding, snap connection, and screw connection.

[0112] The diaphragm assembly 822 is the main body for driving the air movement in the front cavity C1 of the speaker module 80. When Figures 5 - 6 the shown core 82 is applied to Figures 3 - 4 the shown speaker module 80, the core 82 separates the rear cavity C2 and the front cavity C1 in the housing 81 of the speaker module 80 by means of the diaphragm assembly 822, and the voice coil 823 and the magnetic circuit system 8224 are both located in the rear cavity C2.

[0113] Please refer to Figure 8 Figure 8 which is a schematic cross-sectional structure diagram of the cooperation between the diaphragm assembly 822 and the basin frame 821 along the B-B line according to Figure 5 the shown. The diaphragm assembly 822 includes a fixing part 8221, a surround 8222, and a dome 8223.

[0114] The fixing part 8221 is formed in a rectangular ring shape. The fixing part 8221 is laminated and fixed to the top surface 821e of the basin frame 821. The connection manner between the fixing part 8221 and the top surface 821e of the basin frame 821 includes but is not limited to gluing, snap connection, welding, or screw connection.

[0115] The outer peripheral edge of the surround 8222 is connected to the inner peripheral edge of the fixing part 8221. The cross-sectional shape of the surround 8222 is arc-shaped or approximately arc-shaped, and the extending track of the surround 8222 is in a rounded rectangular shape. The extending direction of the long side of the extending track of the surround 8222 is parallel to the X-axis, and the extending direction of the short side of the extending track of the surround 8222 is parallel to the Y-axis. The surround 8222 protrudes in the direction from the bottom surface 821f of the basin frame 821 to the top surface 821e of the basin frame 821, that is, the surround 8222 protrudes toward the side where the top surface 821e of the basin frame 821 faces. In this way, the space below the diaphragm assembly 822 is released, allowing the magnetic circuit system 824 located below the diaphragm assembly 822 to have a larger height dimension, thereby increasing the magnetic induction intensity of the core 82 and improving the sensitivity of the core 82. Of course, it can be understood that in other embodiments, the surround 8222 can also protrude in the direction from the top surface 821e of the basin frame 821 to the bottom surface 821f of the basin frame 821, that is, the surround 8222 protrudes toward the side where the bottom surface 821f of the basin frame 821 faces. Thus, the core 82 can save its upper space, and the front cavity C1 space can be saved accordingly.

[0116] The dome 8223 is surrounded by the surround 8222. And the dome 8223 is in the shape of a rectangular flat plate. The length direction of the dome 8223 is parallel to the X-axis, the width direction of the dome 8223 is parallel to the Y-axis, and the thickness direction of the dome 8223 is parallel to the Z-axis.

[0117] It can be understood that the shape of the diaphragm assembly 822 is not limited to this. When the outer shape of the chassis 821 changes, the shape of the diaphragm assembly 822 can be adaptively adjusted accordingly.

[0118] In some examples, the diaphragm assembly 822 is an integrally formed part. That is to say, the fixing part 8221, the surround 8222 and the dome 8223 are a whole structure. Such a setting is beneficial to improving the structural strength of the diaphragm assembly 822, improving the structural stability of the diaphragm assembly 822, and can also simplify the processing technology of the diaphragm assembly 822. Of course, the present application is not limited to this. The fixing part 8221, the surround 8222 and the dome 8223 can also be independently formed parts. The fixing part 8221 and the surround 8222 can be connected by gluing, and the surround 8222 and the dome 8223 can be connected by gluing. The material of the diaphragm assembly 822 includes but is not limited to metal, plastic, plant fiber and animal fiber.

[0119] Please refer to Figure 9 , Figure 9 for the Figure 5 schematic diagram of the cooperation of the diaphragm assembly 822, the voice coil 823 and the chassis 821 as shown. The voice coil 823 is located inside the chassis 821, and one end of the voice coil 823 is connected to the surface of the dome 8223 facing the inside of the chassis 821. The connection method between the voice coil 823 and the dome 8223 includes but is not limited to gluing, snap connection, welding or screw connection. The voice coil 823 is generally in the shape of a rectangular frame. The extending direction of the long side of the voice coil 823 is parallel to the X-axis, and the extending direction of the short side of the voice coil 823 is parallel to the Y-axis direction. The voice coil 823 is used to cooperate with the magnetic circuit system 824 to synchronously drive the diaphragm assembly 822 to vibrate, and then push the air movement in the front cavity C1 of the speaker module 80 to generate sound. Specifically, the voice coil 823 can be connected to the circuit outside the speaker module 80 through the electrical connection structure 83. After the voice coil 823 is energized, an induced magnetic field can be generated. The magnetic circuit system 824 can respond to the induced magnetic field and apply a driving force to the voice coil 823. The voice coil 823 is driven by the magnetic force of the magnetic circuit system 824 to displace, so as to drive the diaphragm assembly 822 to vibrate, so as to drive the air in the front cavity C1 to vibrate to form sound, and the sound is output through the sound outlet channel 80a.

[0120] Please refer to Figure 10 and Figure 11 , Figure 10 for the Figure 5 schematic cross-sectional structure diagram of the kernel 82 at the B-B line as shown; Figure 11 for theFigure 5 Exploded schematic view of the magnetic circuit system 824 shown. The magnetic circuit system 824 is fixed to the bottom surface of the chassis 821. The magnetic circuit system 824 has an annular magnetic gap 824a, and a portion of the voice coil 823 away from the diaphragm assembly 822 can extend into the magnetic gap 824a, so that the magnetic circuit system 824 can cooperate with the voice coil 823 to drive the diaphragm assembly 822 to vibrate synchronously. It can be understood that in other embodiments, when the voice coil 823 is a planar voice coil, the voice coil 823 may not extend into the above magnetic gap 824a. The planar voice coil can be manufactured by winding or printed circuit methods.

[0121] Please continue to refer to Figure 10 and Figure 11 , the magnetic circuit system 824 includes a central magnet 8241, a side magnet 8242, a first magnetic yoke, and a second magnetic yoke 8245.

[0122] The central magnet 8241 forms a rectangular flat plate structure. Moreover, the thickness of the central magnet 8241 is equal at each position. The length direction of the central magnet 8241 is parallel to the X-axis, the width direction of the central magnet 8241 is parallel to the Y-axis, and the thickness direction of the central magnet 8241 is parallel to the Z-axis. The central magnet 8241 can be a magnet or a magnetic steel. The central magnet 8241 has a first surface 8241a and a second surface 8241b oppositely arranged along its thickness direction. Among them, the first surface 8241a faces the diaphragm assembly 822, and the second surface 8241b faces away from the diaphragm assembly 822, that is, the orientation of the second surface 8241b is the same as the orientation of the bottom surface 821f of the chassis 821.

[0123] The side magnet 8242 is arranged around the circumference of the central magnet 8241. The above magnetic gap 824a is defined between the side magnet 8242 and the central magnet 8241. The side magnet 8242 can be a magnet or a magnetic steel. The magnetization direction of the side magnet 8242 (the direction from the south pole to the north pole, that is, the direction from the S pole to the N pole) is opposite to the magnetization direction of the central magnet 8241. Exemplarily, please refer to Figure 10 , one end of the central magnet 8241 close to the diaphragm assembly 822 is the south pole (S), and the end away from the diaphragm assembly 822 is the north pole (N). One end of the side magnet 8242 close to the diaphragm assembly 822 is the north pole (N), and the end away from the diaphragm assembly 822 is the south pole (S). In this way, a magnetic circuit can be formed between the central magnet 8241 and the side magnet 8242. When the voice coil 823 is energized, the voice coil 823 is driven by the magnetic field in the magnetic gap 824a to vibrate the diaphragm assembly 822.

[0124] The side magnets 8242 include the spaced-apart first side magnet 8242a, second side magnet 8242b, third side magnet 8242c, and fourth side magnet 8242d. The first side magnet 8242a and the second side magnet 8242b are respectively disposed on opposite sides in the length direction of the central magnet 8241, and the first side magnet 8242a and the second side magnet 8242b are symmetrically disposed with respect to the central magnet 8241. The third side magnet 8242c and the fourth side magnet 8242d are respectively disposed on opposite sides in the width direction of the central magnet 8241, and the third side magnet 8242c and the fourth side magnet 8242d are symmetrically disposed with respect to the central magnet 8241. Of course, in other examples, the first side magnet 8242a and the second side magnet 8242b may also be respectively disposed on opposite sides in the width direction of the central magnet 8241, and the third side magnet 8242c and the fourth side magnet 8242d are respectively disposed on opposite sides in the length direction of the central magnet 8241, as long as the arrangement directions of the third side magnet 8242c and the fourth side magnet 8242d are perpendicular to the arrangement directions of the first side magnet 8242a and the second side magnet 8242b. It can be understood that the structure of the side magnets 8242 is not limited thereto. In some other embodiments, the side magnets 8242 may be in a closed ring shape. For example, the side magnets 8242 are in a rectangular frame shape.

[0125] The thickness of the side magnets 8242 is equal everywhere, that is, the thicknesses of the first side magnet 8242a, the second side magnet 8242b, the third side magnet 8242c, and the fourth side magnet 8242d are all equal. And the thickness of the side magnets 8242 is equal to the thickness of the central magnet 8241. Such a setting facilitates the processing and manufacturing of the magnet assembly and also facilitates the assembly of the magnetic circuit system 824.

[0126] Please continue to refer to Figure 10 and Figure 11 , the first magnetic yoke includes the spaced-apart first central magnetic yoke 8243 and first edge magnetic yoke 8244.

[0127] The first central magnetic yoke 8243 is disposed on the first surface 8241a and is stacked with the central magnet 8241. Specifically, the first central magnetic yoke 8243 can be disposed on the first surface 8241a by means such as gluing, snap connection, or screw connection. By disposing the first central magnetic yoke 8243 on the first surface 8241a to constrain the magnetic field lines, the magnetic flux intensity in the magnetic gap 824a can be increased, and the driving intensity for the diaphragm group 822 can be improved.

[0128] The first central magnetic yoke 8243 is formed into a rectangular flat plate structure. The length direction of the first central magnetic yoke 8243 is parallel to the X-axis, the width direction of the first central magnetic yoke 8243 is parallel to the Y-axis, and the thickness direction of the first central magnetic yoke 8243 is parallel to the Z-axis. In this way, it is beneficial for the circumferential extension shape of the first central magnetic yoke 8243 to be consistent with the circumferential extension shape of the central magnet 8241, and the circumferential extension dimension of the first central magnetic yoke 8243 to be consistent with the circumferential extension dimension of the central magnet 8241. The material of the first central magnetic yoke 8243 can be a yoke iron made by stacking silicon steel sheets. The thickness of the first central magnetic yoke 8243 is equal everywhere.

[0129] The first edge magnetic yoke 8244 is disposed on the surface of the edge magnet 8242 that faces the same direction as the first surface 8241a and is stacked with the edge magnet 8242, that is, the first edge magnetic yoke 8244 is stacked on the surface of the edge magnet 8242 that faces the diaphragm group 822. Specifically, the first edge magnetic yoke 8244 can be disposed on the surface of the edge magnet 8242 that faces the diaphragm group 822 by means of gluing, clamping, threaded connection, etc.

[0130] In the embodiment of the present application, the magnetic lines of force can be constrained by the first edge magnetic yoke 8244, the magnetic flux intensity in the magnetic gap 824a can be increased, and the driving intensity for the diaphragm group 822 can be improved.

[0131] The surface of the first edge magnetic yoke 8244 facing away from the edge magnet 8242 is fixedly connected to the bottom surface 821f of the chassis 821. Specifically, the first edge magnetic yoke 8244 can be connected to the bottom surface 821f of the chassis 821 by means of gluing, clamping, threaded connection, etc.

[0132] The first edge magnetic yoke 8244 is located on the outer periphery of the first central magnetic yoke 8243 and is spaced apart from the first central magnetic yoke 8243, so that an insertion port for inserting the voice coil 823 into the magnetic gap 824a can be formed. The material of the first edge magnetic yoke 8244 can be a yoke iron made by stacking silicon steel sheets.

[0133] The shape of the first edge magnetic yoke 8244 can be adapted to the shape of the edge magnet 8242. Specifically, the first edge magnetic yoke 8244 includes a first sub-edge magnetic yoke 8244a, a second sub-edge magnetic yoke 8244b, a third sub-edge magnetic yoke 8244c, and a fourth sub-edge magnetic yoke 8244d. The first sub-edge magnetic yoke 8244a is adapted to the first edge magnet 8242a, the second sub-edge magnetic yoke 8244b is adapted to the second edge magnet 8242b, the third sub-edge magnetic yoke 8244c is adapted to the third edge magnet 8242c, and the fourth sub-edge magnetic yoke 8244d is adapted to the fourth edge magnet 8242d. In other examples, when the edge magnet 8242 is formed in a closed-loop shape, the first edge magnetic yoke 8244 can also be formed in a closed-loop shape adapted to the edge magnet 8242.

[0134] Please continue to refer to Figure 10 , the thickness of the first edge magnetic yoke 8244 is equal everywhere, and the thickness of the first edge magnetic yoke 8244 is equal to the thickness of the first central magnetic yoke 8243.

[0135] Please continue to refer to Figure 10 and Figure 11 , the second magnetic yoke 8245 includes a second central magnetic yoke 82452 and a second edge magnetic yoke 82451.

[0136] The second central magnetic yoke 82452 is disposed on the second surface 8241b and is stacked with the central magnet 8241. Specifically, the second central magnetic yoke 82452 can be disposed on the second surface 8241b by means of gluing, snap connection, screw connection, etc. By providing the second central magnetic yoke 82452, the second central magnetic yoke 82452 can be used to constrain the magnetic field lines, thereby increasing the magnetic flux intensity and improving the driving intensity for the diaphragm group 822.

[0137] The second central magnetic yoke 82452 is formed in a rectangular flat plate-like structure. The length direction of the second central magnetic yoke 82452 is parallel to the X axis, the width direction of the second central magnetic yoke 82452 is parallel to the Y axis, and the thickness direction of the second central magnetic yoke 82452 is parallel to the Z axis. In this way, the circumferential extension shape of the second central magnetic yoke 82452 can be made consistent with the circumferential extension shape of the central magnet 8241, and the circumferential extension dimension of the second central magnetic yoke 82452 is consistent with the circumferential extension dimension of the central magnet 8241. The material of the second central magnetic yoke 82452 can be a yoke iron made of stacked silicon steel sheets. The thickness of the second central magnetic yoke 82452 is equal everywhere.

[0138] The second edge magnetic yoke 82451 is disposed on the surface of the edge magnet 8242 that faces the same direction as the second surface 8241b. That is to say, the second edge magnetic yoke 82451 is disposed on the surface of the edge magnet 8242 that faces away from the diaphragm assembly 822. The second edge magnetic yoke 82451 can be disposed on the surface of the edge magnet 8242 that faces away from the diaphragm assembly 822 by means of gluing, snap connection, screw connection, etc. By using the second edge magnetic yoke 82451 to constrain the magnetic lines of force, the magnetic flux intensity in the magnetic gap 824a can be increased, and the driving intensity for the diaphragm assembly 822 can be improved.

[0139] The second edge magnetic yoke 82451 can be formed into a rectangular ring shape. The second edge magnetic yoke 82451 is located on the outer periphery of the second central magnetic yoke 82452. The material of the second edge magnetic yoke 82451 can be a yoke iron made by stacking silicon steel sheets. The thickness of the second edge magnetic yoke 82451 is equal everywhere.

[0140] Specifically, in order to further increase the magnetic flux intensity, the second magnetic yoke 8245 can further include a connecting magnetic yoke portion 82453. The connecting magnetic yoke portion 82453 is connected between the outer periphery of the second central magnetic yoke 82452 and the inner periphery of the second edge magnetic yoke 82451, and the connecting magnetic yoke portion 82453 faces the magnetic gap 824a. In this way, the connecting magnetic yoke portion 82453 can be used to block one end of the magnetic gap 824a that is away from the diaphragm assembly 822. The material of the connecting magnetic yoke portion 82453 can be a yoke iron made by stacking silicon steel sheets. Of course, in other embodiments, the second magnetic yoke 8245 may not include the connecting magnetic yoke portion 82453.

[0141] In order to improve the structural strength of the second magnetic yoke 8245 and simplify the processing technology of the second magnetic yoke 8245, the second edge magnetic yoke 82451, the connecting magnetic yoke portion 82453, and the second central magnetic yoke 82452 are integrally formed parts. That is to say, the second magnetic yoke 8245 is an integrally formed part. Of course, the present application is not limited thereto. In other embodiments, the connection methods between the second edge magnetic yoke 82451 and the connecting magnetic yoke portion 82453 and between the connecting magnetic yoke portion 82453 and the second central magnetic yoke 82452 include but are not limited to snap connection, gluing, or screw connection.

[0142] Please continue to refer to Figure 10 , the thickness of the second magnetic yoke 8245 is equal everywhere. That is to say, the thicknesses of the connecting magnetic yoke portion 82453, the second central magnetic yoke 82452, and the second edge magnetic yoke 82451 are equal.

[0143] Since the magnetic force lines emitted by the N poles of the central magnet 8241 and the edge magnets 8242 are mainly transmitted between the voice coil 823 and the magnets (i.e., the central magnet 8241 and the edge magnets 8242) through the magnetic yoke (i.e., the first magnetic yoke and the second magnetic yoke 8245). Please refer to Figure 12 , Figure 12 is a schematic diagram of the magnetic force line emission of the core 82 shown in Figures 5 - 6 . As can be shown in Figure 12 , when using the first central magnetic yoke 8243 with a uniform thickness and the second central magnetic yoke 82452 with a uniform thickness for magnetic conduction, the closer to the voice coil 823, the more magnetic force lines transmitted in the first central magnetic yoke 8243 and the second central magnetic yoke 82452 that participate in driving the voice coil 823, and the farther away from the voice coil 823, the fewer magnetic force lines transmitted in the first central magnetic yoke 8243 and the second central magnetic yoke 82452 that participate in driving the voice coil 823. Therefore, in the above embodiment, the magnetic saturation degree in the middle of the first central magnetic yoke 8243 and the middle of the second central magnetic yoke 82452 is lower than that at the positions closer to the voice coil 823, the magnetic conduction ability in the middle of the first central magnetic yoke 8243 and the middle of the second central magnetic yoke 82452 is excessive, and the overall magnetic conduction efficiency of the first central magnetic yoke 8243 and the second central magnetic yoke 82452 is low. Moreover, the first central magnetic yoke 8243 and the second central magnetic yoke 82452 with equal thickness are not conducive to further increasing the thickness of the central magnet 8241 without changing the external dimensions of the magnetic circuit system 824. The current design of the magnetic circuit system 824 is unreasonable and is not conducive to improving the driving force of the magnetic circuit system 824 without increasing the external dimensions of the magnetic circuit system 824.

[0144] In addition, since the magnetic force lines follow the principle of forming the shortest magnetic circuit, some magnetic force lines that do not participate in driving the voice coil 823 will inevitably be emitted from the outer peripheral ends of the edge magnets 8242 away from the central magnet 8241. Although the first edge magnetic yoke 8244 and the second edge magnetic yoke 82451 are respectively arranged on both sides in the thickness direction of the edge magnets 8242, as shown in Figure 12As shown, these ineffective magnetic lines of force still cannot be conducted by the first edge magnetic yoke 8244 and the second edge magnetic yoke 82451 to the voice coil 823. That is to say, the outer peripheral ends of the first edge magnetic yoke 8244 and the second edge magnetic yoke 82451 are ineffective areas, and their transmission of magnetic lines of force fails. This not only reduces the overall magnetic conduction efficiency of the first edge magnetic yoke 8244 and the second edge magnetic yoke 82451. Moreover, due to the equal-thickness design of the first edge magnetic yoke 8244 and the second edge magnetic yoke 82451, it is also not conducive to designing the thickness dimension of the edge magnet 8242 to be larger without changing the external dimensions of the edge magnetic circuit system 824. The design of the magnetic circuit system 824 is unreasonable and is not conducive to improving the driving force of the magnetic circuit system 824 without increasing the external dimensions of the magnetic circuit system 824.

[0145] In short, the structural design of the magnetic circuit system 824 in the above embodiments is unreasonable and is not conducive to improving the driving force of the magnetic circuit system 824 without increasing the external dimensions of the magnetic circuit system 824.

[0146] To solve the above technical problems, the structures of the magnetic circuit systems 824 with different examples are given below. In this way, without changing the external dimensions of the magnetic circuit system 824, the structure of the magnetic circuit system 824 can be designed more reasonably, and it is conducive to improving the magnetic induction intensity of the magnetic circuit system 824, thereby improving the driving force of the magnetic circuit system 824 on the voice coil 823, which is conducive to ensuring that the speaker module 80 takes into account both thinness and audio effects, and further ensuring that the electronic device 100 takes into account both thinness and audio effects.

[0147] Example 1

[0148] Please refer to Figure 13 , Figure 14 and Figure 15 , Figure 13 , which is a schematic structural diagram of the magnetic circuit system 824 according to some other embodiments of the present application; Figure 14 is a schematic sectional decomposition structure diagram at the C-C line in the magnetic circuit system 824 shown in Figure 13 ; Figure 15 is a schematic sectional mating structure diagram at the C-C line of the magnetic circuit system 824 shown in Figure 13 . The difference between this embodiment and the magnetic circuit system 824 shown in the above Figures 5 - 6 is as follows:

[0149] A first groove 82431 is formed in the middle of the first central magnetic yoke 8243 facing the first surface 8241a. A first protrusion 8241a1 is provided on the first surface 8241a, and the first protrusion 8241a1 is fitted in the first groove 82431. Thus, by providing the first groove 82431 in the middle of the first central magnetic yoke 8243 facing the first surface 8241a, it is beneficial to reduce the thickness of the first central magnetic yoke 8243 at the first groove 82431, thereby at least to some extent solving the problem of excessive magnetic conduction ability in the middle of the first central magnetic yoke 8243, improving the magnetic conduction efficiency in the middle of the first central magnetic yoke 8243 and the magnetic saturation degree of the first central magnetic yoke 8243 corresponding to the first groove 82431. Moreover, the provision of the first groove 82431 also provides an avoidance space for the provision of the first protrusion 8241a1, so that the overall thickness dimension of the first protrusion 8241a1 and the central magnet 8241 is increased. In this way, without changing the external dimensions of the magnetic circuit system 824, the magnetic flux of the magnetic circuit system 824 can be increased, the driving force of the magnetic circuit system 824 on the voice coil 823 can be increased, and further the speaker module 80 can have a larger amplitude, and the low-frequency performance and external playback performance of the speaker module 80 are optimized.

[0150] One side surface of the first central magnetic yoke 8243 facing away from the first surface 8241a is a plane parallel to the first surface 8241a. In this way, the thickness of the first central magnetic yoke 8243 at the first groove 82431 is less than the thickness of the first central magnetic yoke 8243 where the first groove 82431 is not provided, thereby solving the problem of excessive magnetic conduction ability in the middle of the first central magnetic yoke 8243, improving the magnetic conduction efficiency in the middle of the first central magnetic yoke 8243 and the magnetic saturation degree of the first central magnetic yoke 8243 corresponding to the first groove 82431. Of course, the present application is not limited to this. In other embodiments, the thickness of the first central magnetic yoke 8243 is equal everywhere, as long as the first groove 82431 is provided on the surface of the first central magnetic yoke 8243 facing the first surface 8241a.

[0151] In order to further improve the uniformity of the magnetic saturation degree on the first central magnetic yoke 8243, so as to facilitate the transmission of more magnetic field lines between the voice coil 823 and the magnet, and then improve the magnetic induction intensity of the magnetic circuit system 824, in the direction from the center of the first central magnetic yoke 8243 to the outer periphery of the first central magnetic yoke 8243, the distance between the wall surface of the first groove 82431 and the first surface 8241a gradually decreases. Specifically, in the direction from the center of the first central magnetic yoke 8243 to the outer periphery of the first central magnetic yoke 8243, the distance between the wall surface of the first groove 82431 and the first surface 8241a can gradually decrease non-linearly. Exemplarily, the wall surface of the first groove 82431 is a spherical crown surface, and the first protrusion 8241a1 is a spherical segment shape. Another exemplarily, the wall surface of the first groove 82431 is an ellipsoidal surface, and the surface of the first protrusion 8241a1 is an ellipsoidal surface. Specifically, in the direction from the center of the first central magnetic yoke 8243 to the outer periphery of the first central magnetic yoke 8243, the distance between the wall surface of the first groove 82431 and the first surface 8241a can gradually decrease linearly. Another exemplarily, the wall surface of the first groove 82431 is a conical surface, and the first protrusion 8241a1 is a cone shape. Of course, the present application is not limited thereto. In other embodiments, the shape of the wall surface of the first groove 82431 can also be stepped.

[0152] In order to improve the connection strength between the first protrusion 8241a1 and the central magnet 8241, the first protrusion 8241a1 and the central magnet 8241 can be integrally formed. Of course, the present application is not limited thereto. The first protrusion 8241a1 and the central magnet 8241 can also be connected by means such as gluing, snap connection or screw connection.

[0153] Please continue to refer to Figure 14 and Figure 15, a second groove 824521 is formed in the middle of the second central magnetic yoke 82452 facing the second surface 8241b, and a second protrusion 8241b1 is provided on the second surface 8241b, and the second protrusion 8241b1 is fitted in the second groove 824521. Thus, by providing the second groove 824521 in the middle of the second central magnetic yoke 82452 facing the second surface 8241b, it is beneficial to reduce the thickness of the second central magnetic yoke 82452 at the second groove 824521, thereby at least to some extent solving the problem of excessive magnetic conduction capacity in the middle of the second central magnetic yoke 82452, improving the magnetic conduction efficiency in the middle of the second central magnetic yoke 82452 and the magnetic saturation degree of the second central magnetic yoke 82452 corresponding to the second groove 824521. Moreover, the provision of the second groove 824521 also provides an avoidance space for the provision of the second protrusion 8241b1, so that the overall thickness dimension of the first protrusion 8241a1, the second protrusion 8241b1 and the central magnet 8241 is further increased. In this way, without changing the external dimension of the magnetic circuit system 824, the magnetic flux of the magnetic circuit system 824 can be increased, the driving force of the magnetic circuit system 824 on the voice coil 823 can be increased, and thus the speaker module 80 can have a larger amplitude, and the low-frequency performance and external playback performance of the speaker module 80 are optimized.

[0154] According to the core 82 of the embodiment of the present application, by providing the first groove 82431 on the first central magnetic yoke 8243, providing the second groove 824521 on the second central magnetic yoke 82452, and respectively providing the first protrusion 8241a1 adapted to the first groove 82431 and the second protrusion 8241b1 adapted to the second groove 824521 on the central magnet 8241, it is beneficial to increase the overall thickness of the central magnet 8241, the first protrusion 8241a1 and the second protrusion 8241b1 without changing the thickness of the magnetic circuit system 824, thereby increasing the magnetic flux of the magnetic circuit system 824, increasing the driving force of the magnetic circuit system 824 on the voice coil 823, enabling the speaker module 80 to have a larger amplitude, and optimizing the audio performance of the speaker module 80. In addition, it is beneficial to reduce the thickness at the middle parts of the first central magnetic yoke 8243 and the second central magnetic yoke 82452, thereby at least to some extent solving the problem of excessive magnetic conduction capacity in the middle parts of the first central magnetic yoke 8243 and the second central magnetic yoke 82452, and improving the magnetic conduction efficiency in the middle parts of the first central magnetic yoke 8243 and the second central magnetic yoke 82452.

[0155] Of course, the present application is not limited thereto. In some other examples, a first groove 82431 may be provided on the first central magnetic yoke 8243, and a first protrusion 8241a1 may be provided on the first surface 8241a of the central magnet 8241, while no second groove 824521 is provided on the second central magnetic yoke 82452, and no second protrusion 8241b1 is provided on the second surface 8241b of the central magnet 8241. Alternatively, no first groove 82431 is provided on the first central magnetic yoke 8243, and no first protrusion 8241a1 is provided on the first surface 8241a of the central magnet 8241, while a second groove 824521 is provided on the second central magnetic yoke 82452, and a second protrusion 8241b1 is provided on the second surface 8241b of the central magnet 8241.

[0156] One side surface of the second central magnetic yoke 82452 facing away from the second surface 8241b is a plane parallel to the second surface 8241b. In this way, the thickness of the second central magnetic yoke 82452 at the second groove 824521 is less than the thickness of the second central magnetic yoke 82452 at the position where the second groove 824521 is not provided, thereby solving the problem of excessive magnetic conduction capacity in the middle of the second central magnetic yoke 82452, improving the magnetic conduction efficiency in the middle of the second central magnetic yoke 82452 and the magnetic saturation degree of the second central magnetic yoke 82452 corresponding to the second groove 824521. Of course, the present application is not limited thereto. In other embodiments, the thickness of the second central magnetic yoke 82452 is equal everywhere, as long as a second groove 824521 is provided on the surface of the second central magnetic yoke 82452 facing the second surface 8241b.

[0157] In order to further improve the uniformity of the magnetic saturation degree on the second central yoke 82452, so as to facilitate the transmission of more magnetic field lines between the voice coil 823 and the magnet, in the direction from the center of the second central yoke 82452 to the outer periphery of the second central yoke 82452, the distance between the wall surface of the second groove 824521 and the second surface 8241b gradually decreases. Specifically, in the direction from the center of the second central yoke 82452 to the outer periphery of the second central yoke 82452, the distance between the wall surface of the second groove 824521 and the second surface 8241b decreases non-linearly. Exemplarily, the wall surface of the second groove 824521 is a spherical crown surface, and the second protrusion 8241b1 is a spherical segment shape. Another example is that the wall surface of the second groove 824521 is an ellipsoidal surface, and the surface of the second protrusion 8241b1 is an ellipsoidal surface. Specifically, in the direction from the center of the second central yoke 82452 to the outer periphery of the second central yoke 82452, the distance between the wall surface of the second groove 824521 and the second surface 8241b decreases linearly. Another example is that the wall surface of the second groove 824521 is a conical surface, and the second protrusion 8241b1 is a cone shape. Of course, the present application is not limited thereto. In other embodiments, the shape of the wall surface of the second groove 824521 can also be stepped.

[0158] In order to improve the connection strength between the second protrusion 8241b1 and the central magnet 8241, the second protrusion 8241b1 and the central magnet 8241 can be integrally formed. Of course, the present application is not limited thereto. The second protrusion 8241b1 and the central magnet 8241 can also be connected by means such as gluing, snap connection or screw connection.

[0159] The shape and size of the second protrusion 8241b1 are the same as those of the first protrusion 8241a1. Exemplarily, the second protrusion 8241b1 and the first protrusion 8241a1 are symmetrically arranged with respect to the central magnet 8241.

[0160] Based on the above embodiments, please continue to refer to Figure 14 and Figure 15, a first mating region H is formed on the surface of the first edge yoke 8244 facing the side magnet 8242. The first mating region H includes a first region H1 and a second region H2. One end of the first region H1 close to the first central yoke 8243 extends to one side edge of the first edge yoke 8244 close to the first central yoke 8243. The second region H2 is located on the side of the first region H1 away from the first central yoke 8243. And the second region H2 extends to the side edge of the first edge yoke 8244 away from the first central yoke 8243. The distance between the second region H2 and the plane where the central magnet 8241 is located is greater than the distance between the first region H1 and the plane X where the central magnet 8241 is located. That is to say, relatively speaking, the second region H2 is farther away from the plane X where the central magnet 8241 is located than the first region H1.

[0161] A first adaptation region G is formed on the surface of the side magnet 8242 facing the first edge yoke 8244. The first adaptation region G includes a first sub - adaptation region G1 and a second sub - adaptation region G2. The second sub - adaptation region G2 is located on the side of the first sub - adaptation region G1 away from the central magnet 8241. The distance between the second sub - adaptation region G2 and the plane where the central magnet 8241 is located is greater than the distance between the first sub - adaptation region G1 and the plane where the central magnet 8241 is located. In this way, the second sub - adaptation region G2 can be adapted to the second region H2, and the first sub - adaptation region G1 can be adapted to the first region H1, so as to facilitate the adaptation of the first adaptation region G to the first mating region H, so as to facilitate the adaptation of the surface of one side of the side magnet 8242 facing the first edge yoke 8244 to the surface of the first edge yoke 8244 facing the side magnet 8242.

[0162] In the embodiment of the present application, by setting the second region H2 on the surface of the first edge yoke 8244 facing the side magnet 8242, and the distance between the second region H2 and the plane where the central magnet 8241 is located is greater than the distance between the first region H1 and the plane where the central magnet 8241 is located. In this way, the second region H2 can avoid the second sub - adaptation region G2, so as to facilitate the setting of the second sub - adaptation region G2 on the side magnet 8242, thereby increasing the thickness of the side magnet 8242 corresponding to the second sub - adaptation region G2. Furthermore, more magnetic lines of force corresponding to the second adaptation region K on the side magnet 8242 can participate in the driving of the voice coil 823, improving the magnetic induction intensity of the magnetic circuit system 824 and the driving force of the magnetic circuit system 824 on the voice coil 823.

[0163] Here, it can be understood that the plane X where the central magnet 8241 is located means that this plane X is parallel to both the first surface 8241a and the second surface 8241b, and this plane X passes through the center of the central magnet 8241.

[0164] Specifically, the surface of the first edge yoke 8244 on the side facing away from the side magnet 8242 is parallel to the plane where the central magnet 8241 is located. In this way, the thickness of the first edge yoke 8244 in the first region H1 is greater than the thickness of the first edge yoke 8244 in the second region H2. This can achieve the purpose of improving the magnetic conduction efficiency of the first edge yoke 8244 by reducing the thickness of the failure region on the first edge yoke 8244 without changing the external dimensions of the magnetic circuit system 824. At the same time, it can increase the thickness of the side magnet 8242 in the second sub-adaptive region K2, which is beneficial for more magnetic force lines corresponding to the second sub-adaptive region K2 on the side magnet 8242 to participate in the driving of the voice coil 823, improve the magnetic induction intensity of the magnetic circuit system 824, and increase the driving force of the magnetic circuit system 824 on the voice coil 823. Of course, the present application is not limited to this. In other embodiments, the thickness of the first edge yoke 8244 can also be equal as long as the first fitting region H is provided on the first edge yoke 8244.

[0165] Specifically, the surface of the first edge yoke 8244 on the side facing away from the side magnet 8242 is coplanar with the surface of the first central yoke 8243 on the side facing away from the central magnet 8241. Such a setting is beneficial to improving the structural compactness of the magnetic circuit system 824, and the structural layout of the magnetic circuit system 824 is more reasonable, which is beneficial to increasing the driving force of the magnetic circuit system 824 on the voice coil 823.

[0166] Specifically, please continue to refer to Figure 14 and Figure 15 , in the arrangement direction of the first region H1 and the second region H2, the width dimension of the first region is d, and the thickness dimension of the first edge yoke 8244 corresponding to the first region H1 is h, and d and h satisfy: d≥0.5h. Exemplarily, d can be 0.8h, 1h, 1.2h, 1.5h, 1.7h, 1.9h, 2h, 2.3h, 2.5h, 2.8h, 3h, 3.2h, 3.5h, 3.7h, 4h, 4.2h, 4.5h or 5h. In this way, the width dimension of the first region H1 can be combined with the thickness dimension of the position where the first region H1 is located on the first edge yoke 8244 to optimize the structure of the first edge yoke 8244 and improve the magnetic conduction efficiency of the first edge yoke 8244. Specifically, the width of the first sub-adaptive region G1 is equal to the width of the first region H1.

[0167] Specifically, please continue to refer to Figure 14 and Figure 15, in the direction from the center of the first central magnetic yoke 8243 to the outer periphery of the first central magnetic yoke 8243, the second region H2 extends obliquely away from the plane X where the central magnet 8241 is located from the first region H1. Such a setting can achieve that the second sub-adaptive region G2 extends obliquely away from the plane where the central magnet 8241 is located from the first sub-adaptive region G1, which is beneficial to using the change in the shape of the side magnet 8242, so that more magnetic field lines corresponding to the second sub-adaptive region K2 on the side magnet 8242 participate in driving the voice coil 823, improving the magnetic induction intensity of the magnetic circuit system 824 and the driving force of the magnetic circuit system 824 on the voice coil 823. Specifically, the second region H2 can be an inclined plane or a curved surface, where the curved surface includes but is not limited to an elliptical arc surface or a circular arc surface. Of course, the present application is not limited thereto. In other examples, the second region H2 can also be formed as a stepped surface; or, the second region H2 is parallel to the plane X where the central magnet 8241 is located, so that the second region H2 and the first region H1 can form a step.

[0168] Specifically, the first region H1 is a plane parallel to the plane X where the central magnet 8241 is located. Of course, the present application is not limited thereto. In other examples, the first region H1 can also be an inclined plane relative to the plane X where the central magnet 8241 is located. As long as it is ensured that the thickness of the first edge magnetic yoke 8244 at the position of the first region H1 is greater than the thickness of the first edge magnetic yoke 8244 at the position of the second region H2.

[0169] Please refer to Figure 16 , Figure 16 is a schematic structural diagram of the first edge magnetic yoke 8244 according to Figure 13 shown. The first mating region H is formed on the first sub-edge magnetic yoke 8244a of the first edge magnetic yoke 8244. Specifically, avoiding notches 8244aa are respectively formed at both ends of the first sub-edge magnetic yoke 8244a along the Y-axis direction, and the avoiding notches 8244aa extend to the side edge of the first sub-edge magnetic yoke 8244a away from the second sub-edge magnetic yoke 8244b. The avoiding notches 8244aa are used to avoid the electrical connectors detailed below. Along the Y-axis direction, the first mating region H on the first sub-edge magnetic yoke 8244a is located between the two avoiding notches 8244aa.

[0170] Specifically, the first sub-edge magnetic yoke 8244a includes a first part 8244a1, a second part 8244a2, and a third part 8244a3. The first part 8244a1, the second part 8244a2, and the third part 8244a3 are arranged and connected in sequence along the Y-axis direction. The surface of the second part 8244a2 facing the side magnet 8242 is formed as a first mating region H. One end of the second part 8244a2 far from the first central magnetic yoke 8243 extends beyond the first part 8244a1 in the direction away from the first central magnetic yoke 8243 to define an avoidance notch 8244aa with the first part 8244a1. One end of the second part 8244a2 far from the first central magnetic yoke 8243 extends beyond the third part 8244a3 in the direction away from the first central magnetic yoke 8243 to define another avoidance notch 8244aa with the third part 8244a3. The surface of the third part 8244a3 on the side facing the first side magnet 8242a, the surface of the first part 8244a1 on the side facing the first side magnet 8242a, and the first region H1 on the second part 8244a2 are coplanar.

[0171] In this way, the structure of the first sub-edge magnetic yoke 8244a can be simplified, the processing efficiency of the first sub-edge magnetic yoke 8244a can be improved, the manufacturing cost of the first sub-edge magnetic yoke 8244a can be reduced, and thus the manufacturing cost of the magnetic circuit system 824 can be reduced.

[0172] Of course, the present application is not limited to this. In some other examples, in order to further simplify the structure of the first sub-edge magnetic yoke 8244a, the first sub-edge magnetic yoke 8244a may not include the first part 8244a1 and the third part 8244a3.

[0173] Please continue to refer to Figure 16 , a first mating region H is formed on the second sub-edge magnetic yoke 8244b. Specifically, the second sub-edge magnetic yoke 8244b and the first sub-edge magnetic yoke 8244a have the same structure, which will not be elaborated here. Since the second sub-edge magnetic yoke 8244b and the first sub-edge magnetic yoke 8244a are respectively located on opposite sides of the first central magnetic yoke 8243, by providing the first mating region H on the second sub-edge magnetic yoke 8244b, the magnetic circuit system 824 can be made symmetric with respect to the voice coil 823, so as to apply the same driving force to both ends of the voice coil 823 in the X-axis direction and prevent the problem of roll vibration of the diaphragm group 822.

[0174] Please continue to refer to Figure 16, the entire surface of the third sub-edge magnetic yoke 8244c facing the third side magnet 8242c is formed as a first fitting region H. The structure of the fourth sub-edge magnetic yoke 8244d is the same as that of the third sub-edge magnetic yoke 8244c. Since the third sub-edge magnetic yoke 8244c and the fourth sub-edge magnetic yoke 8244d are respectively located on the other opposite sides of the first central magnetic yoke 8243, by providing the first fitting region H on both the fourth sub-edge magnetic yoke 8244d and the third sub-edge magnetic yoke 8244c, the magnetic circuit system 824 can be set to be symmetric with respect to the voice coil 823, thereby applying the same magnitude of driving force to both ends of the voice coil 823 in the Y-axis direction and preventing the problem of roll vibration of the diaphragm group 822. Of course, the present application is not limited to this. In some other embodiments, the first fitting region H can be provided only on a partial surface of the third sub-edge magnetic yoke 8244c facing the third side magnet 8242c and a partial surface of the fourth sub-edge magnetic yoke 8244d facing the fourth side magnet 8242d.

[0175] In some other embodiments of the present application, the first fitting region H can be provided only on the first sub-edge magnetic yoke 8244a and the second sub-edge magnetic yoke 8244b, and not provided on the third sub-edge magnetic yoke 8244c and the fourth sub-edge magnetic yoke 8244d; or, the first fitting region H can be provided on the third sub-edge magnetic yoke 8244c and the fourth sub-edge magnetic yoke 8244d, and not provided on the first sub-edge magnetic yoke 8244a and the second sub-edge magnetic yoke 8244b.

[0176] Please refer to Figure 17 and Figure 18 , Figure 17 is a schematic structural diagram of the side magnet 8242 according to Figure 13 shown, Figure 18 is a schematic diagram of the cooperation between the side magnet 8242 and the first edge magnetic yoke 8244 according to Figure 13 shown. Avoidance regions 8242aa are respectively formed at both ends of the surface of the first side magnet 8242a facing the first sub-edge magnetic yoke 8244a along the Y-axis direction. The avoidance regions 8242aa penetrate through the first side magnet 8242a along the X-axis direction. Along the Y-axis direction, the first adaptation region G on the first side magnet 8242a is located between the two avoidance regions 8242aa.

[0177] Specifically, the first side magnet 8242a includes a first magnet portion 8242a1, a second magnet portion 8242a2, and a third magnet portion 8242a3. The first magnet portion 8242a1, the second magnet portion 8242a2, and the third magnet portion 8242a3 are arranged in sequence and connected along the Y-axis direction. A first adaptation region G is formed on the surface of the second magnet portion 8242a2 facing the side magnet 8242. The side surface of the third magnet portion 8242a3 facing the first sub-edge magnetic yoke 8244a and the side surface of the first magnet portion 8242a1 facing the first sub-edge magnetic yoke 8244a are both formed as avoidance regions 8242aa. The avoidance region 8242aa is coplanar with the first sub-adaptation region G1 on the second magnet portion 8242a2, so as to facilitate the adaptation of the first side magnet 8242a to the first sub-edge magnetic yoke 8244aa.

[0178] Please continue to refer to Figure 18 , the first portion 8244a1 cooperates with the first magnet portion 8242a1, and the first portion 8244a1 covers a part of the avoidance region 8242aa on the first magnet portion 8242a1. The remaining part of the avoidance region 8242aa on the first magnet portion 8242a1 and the corresponding avoidance notch 8244aa can form an avoidance space M. The third portion 8244a3 cooperates with the third magnet portion 8242a3, and the third portion 8244a3 covers a part of the avoidance region 8242aa on the third magnet portion 8242a3. The remaining part of the avoidance region 8242aa on the third magnet portion 8242a3 and the corresponding avoidance notch 8244aa can form another avoidance space M. The avoidance space M is used to avoid the electrical connector 825 mentioned below. The structure of the second side magnet 8242b is the same as that of the first side magnet 8242a, and will not be described in detail here.

[0179] Please continue to refer to Figure 17 , a first adaptation region G is formed on the surface of the third side magnet 8242c facing the third sub-edge magnetic yoke 8244c, and the first adaptation region G extends along the X-axis direction to both ends of the third side magnet 8242c, so as to facilitate the adaptation to the first cooperation region H on the third sub-edge magnetic yoke 8244c. The structure of the fourth side magnet 8242d is the same as that of the third side magnet 8242c, and will not be described in detail here.

[0180] On the basis of the above embodiments, please return to refer to Figure 14 and Figure 15, a second mating region J is formed on the surface of the second edge magnetic yoke 82451 facing the edge magnet 8242. The second mating region J includes a third region J1 and a fourth region J2. One end of the third region J1 close to the second central magnetic yoke 82452 extends to one side edge of the second edge magnetic yoke 82451 close to the second central magnetic yoke 82452. The fourth region J2 is located on the side of the third region J1 away from the second central magnetic yoke 82452. And the fourth region J2 extends to the side edge of the second edge magnetic yoke 82451 away from the second central magnetic yoke 82452. The distance between the fourth region J2 and the plane X where the central magnet 8241 is located is greater than the distance between the third region J1 and the plane X where the central magnet 8241 is located. That is to say, relatively speaking, the fourth region J2 is farther away from the plane X where the central magnet 8241 is located than the third region J1.

[0181] A second adaptation region K is formed on the surface of the edge magnet 8242 facing the second edge magnetic yoke 82451. The second adaptation region K includes a third sub - adaptation region K1 and a fourth sub - adaptation region K2. The fourth sub - adaptation region K2 is located on the side of the third sub - adaptation region K1 away from the central magnet 8241. The distance between the fourth sub - adaptation region K2 and the plane X where the central magnet 8241 is located is greater than the distance between the third sub - adaptation region K1 and the plane X where the central magnet 8241 is located. In this way, the fourth sub - adaptation region K2 can be adapted to the fourth region J2, and the third sub - adaptation region K1 can be adapted to the third region J1, so as to facilitate the adaptation of the second adaptation region K to the second mating region J, so as to facilitate the adaptation of the surface of one side of the edge magnet 8242 facing the second edge magnetic yoke 82451 to the surface of the second edge magnetic yoke 82451 facing the edge magnet 8242.

[0182] In the embodiment of the present application, by providing the fourth region J2 on the surface of the second edge magnetic yoke 82451 facing the edge magnet 8242, and the distance between the fourth region J2 and the plane X where the central magnet 8241 is located is greater than the distance between the third region J1 and the plane X where the central magnet 8241 is located. In this way, the fourth region J2 can avoid the fourth sub - adaptation region K2, so as to facilitate the setting of the fourth sub - adaptation region K2 on the edge magnet 8242, thereby increasing the thickness of the edge magnet 8242 corresponding to the fourth sub - adaptation region K2. Furthermore, more magnetic force lines corresponding to the fourth sub - adaptation region K2 on the edge magnet 8242 can participate in the driving of the voice coil 823, improving the magnetic induction intensity of the magnetic circuit system 824 and the driving force of the magnetic circuit system 824 on the voice coil 823.

[0183] Specifically, the surface of the second edge magnetic yoke 82451 on the side facing away from the edge magnet 8242 is parallel to the plane where the central magnet 8241 is located. In this way, the thickness of the second edge magnetic yoke 82451 at the third region J1 is greater than the thickness of the second edge magnetic yoke 82451 at the fourth region J2. In this way, without changing the external dimensions of the magnetic circuit system 824, by reducing the thickness of the failure region on the second edge magnetic yoke 82451, the magnetic conduction efficiency of the second edge magnetic yoke 82451 can be improved, and at the same time, the purpose of increasing the thickness of the edge magnet 8242 at the fourth sub-adaptation region K2 can be achieved, which is beneficial for more magnetic force lines corresponding to the fourth sub-adaptation region K2 on the edge magnet 8242 to participate in the driving of the voice coil 823, improving the magnetic induction intensity of the magnetic circuit system 824 and the driving force of the magnetic circuit system 824 on the voice coil 823. Of course, the present application is not limited to this. In other embodiments, the thickness of the second edge magnetic yoke 82451 can also be equal as long as the second matching region J is provided on the second edge magnetic yoke 82451.

[0184] Specifically, the surface of the second edge magnetic yoke 82451 on the side facing away from the edge magnet 8242 and the surface of the second central magnetic yoke 82452 on the side facing away from the central magnet 8241 are coplanar. Such a setting is beneficial to improving the structural compactness of the magnetic circuit system 824, and the structural layout of the magnetic circuit system 824 is more reasonable, which is beneficial to improving the driving force of the magnetic circuit system 824 on the voice coil 823.

[0185] Specifically, please continue to refer to Figure 14 and Figure 15 In the arrangement direction of the third region J1 and the fourth region J2, the width dimension of the third region is m, and the thickness dimension of the second edge magnetic yoke 82451 corresponding to the third region J1 is n, and m and n satisfy: m≥0.5n. Exemplarily, m can be 0.8n, 1n, 1.2n, 1.5n, 1.7n, 1.9n, 2n, 2.3n, 2.5n, 2.8n, 3n, 3.2n, 3.5n, 3.7n, 4n, 4.2n, 4.5n or 5n. In this way, the width dimension of the third region J1 and the thickness dimension of the second edge magnetic yoke 82451 at the position where the third region J1 is located can be combined to optimize the structure of the second edge magnetic yoke 82451 and improve the magnetic conduction efficiency of the second edge magnetic yoke 82451. Specifically, the width of the third sub-adaptation region K1 is equal to the width of the third region J1.

[0186] Specifically, please continue to refer to Figure 14 and Figure 15, in the direction from the center of the second central magnetic yoke 82452 to the outer periphery of the second central magnetic yoke 82452, the fourth region J2 extends obliquely away from the plane X where the central magnet 8241 is located in a direction away from the third region J1. By setting it like this, it can be realized that the fourth sub-adaptive region K2 extends obliquely away from the plane X where the central magnet 8241 is located in a direction away from the third sub-adaptive region K1, which is beneficial to making more magnetic field lines corresponding to the fourth sub-adaptive region K2 on the side magnet 8242 participate in the driving of the voice coil 823 by using the change in the shape of the side magnet 8242, improving the magnetic induction intensity of the magnetic circuit system 824 and the driving force of the magnetic circuit system 824 on the voice coil 823. Specifically, the fourth region J2 can be an inclined plane or a curved surface, where the curved surface includes but is not limited to an elliptical arc surface or a circular arc surface. Of course, this application is not limited to this. In other examples, the fourth region J2 can also be formed into a stepped surface; or, the fourth region J2 is parallel to the plane X where the central magnet 8241 is located. In this way, the third region J1 and the fourth region J2 can form a step.

[0187] Specifically, the third region J1 is a plane parallel to the plane X where the central magnet 8241 is located. Of course, this application is not limited to this. In other examples, the third region J1 can also be an inclined plane inclined relative to the plane X where the central magnet 8241 is located. As long as it is ensured that the thickness of the second edge magnetic yoke 82451 at the position of the third region J1 is greater than the thickness of the second edge magnetic yoke 82451 at the position of the fourth region J2.

[0188] Please refer to Figure 19 , Figure 19 is a schematic structural diagram of the second magnetic yoke 8245 in the magnetic circuit system 824 shown in Figure 13 . At least the parts of the second edge magnetic yoke 82451 respectively facing the first side magnet 8242a, the second side magnet 8242b, the third side magnet 8242c, and the fourth side magnet 8242d are respectively formed with second mating regions J. In some examples, please refer to Figure 19 shown. The entire surface of the second edge magnetic yoke 82451 facing the side magnet 8242 is formed as the second mating region J. In this way, the structure of the second magnetic yoke 8245 can be simplified, which is convenient for the processing and manufacturing of the second magnetic yoke 8245.

[0189] Specifically, please refer to Figure 19, the surface of the second edge magnetic yoke 82451 facing the edge magnet 8242 has a first magnetic conduction region 824511 and a second magnetic conduction region 824512 located on both sides in the direction of the length of the second central magnetic yoke 82452, and the surface of the second edge magnetic yoke 82451 facing the edge magnet 8242 has a third magnetic conduction region 824513 and a fourth magnetic conduction region 824514 located on both sides in the width direction of the second central magnetic yoke 82452. The first magnetic conduction region 824511, the second magnetic conduction region 824512, the third magnetic conduction region 824513, and the fourth magnetic conduction region 824514 are connected in sequence. The first magnetic conduction region 824511, the second magnetic conduction region 824512, the third magnetic conduction region 824513, and the fourth magnetic conduction region 824514 are respectively formed as the second fitting region J.

[0190] Please refer to Figure 20 , Figure 20 is a schematic diagram of the cooperation of the second magnetic yoke 8245, the edge magnet 8242, and the first edge magnetic yoke 8244 in the magnetic circuit system 824 shown in Figure 13 . The first edge magnet 8242a covers the middle region of the first magnetic conduction region 824511 in the Y-axis direction, and the second adaptation region K on the surface of the first edge magnet 8242a facing the first magnetic conduction region 824511 extends to both ends of the first edge magnet 8242a in the Y-axis direction. The third edge magnet 8242c covers the middle region of the third magnetic conduction region 824513 in the X-axis direction, and the second adaptation region K on the surface of the third edge magnet 8242c facing the third magnetic conduction region 824513 extends to both ends of the third edge magnet 8242c in the X-axis direction. Since the second edge magnet 8242b has the same structure as the first edge magnet 8242a, and the fourth edge magnet 8242d has the same structure as the third edge magnet 8242c, the structures of the fourth edge magnet 8242d and the second edge magnet 8242b will not be elaborated here.

[0191] Of course, the present application is not limited to this. In other embodiments, the second fitting region J can be set in the region of the second edge magnetic yoke 82451 that is only covered by the edge magnet 8242.

[0192] In order to further increase the magnetic flux intensity and improve the magnetic conduction effect of the second magnetic yoke 8245, the second edge magnetic yoke 82451 is connected to the second central magnetic yoke 82452 through the connecting magnetic yoke portion 82453. Moreover, the thickness of the connecting magnetic yoke portion 82453, the thickness of the second edge magnetic yoke 82451 at the third region J1, and the thickness of the portion of the second central magnetic yoke 82452 where the second groove 824521 is not provided are equal.

[0193] On the basis of the above embodiments, in order to realize the electrical connection between the kernel 82 and the electrical connection structure 83, please refer toFigure 21 and Figure 22 , Figure 21 is a schematic diagram of the cooperation of the magnetic circuit system 824, the chassis 821, the voice coil 823, the electrical connector 825 and the counterweight balance unit 826 as shown in Figure 13 ; Figure 22 is a schematic diagram of the cooperation of the magnetic circuit system 824, the voice coil 823, the electrical connector 825 and the counterweight balance unit 826 as shown in Figure 13 . The inner core 82 includes the electrical connector 825. The electrical connector 825 is connected between the first short side portion 821a of the chassis 821 and the voice coil 823. In this way, the connection path of the electrical connector 825 is short, and its volume can be made smaller, which is beneficial to reducing the cost of the inner core 82. The connection methods of the electrical connector 825 and the chassis 821 include, but are not limited to, gluing, snap connection, screw connection or welding. The connection methods of the electrical connector 825 and the voice coil 823 include, but are not limited to, gluing, snap connection, screw connection or welding.

[0194] The electrical connector 825 has two first ends D1 and two second ends D2, and the two first ends D1 and the two second ends D2 are electrically connected in a one-to-one correspondence. Among them, the two first ends D1 of the electrical connector 825 are respectively connected to two corner positions of the voice coil 823 adjacent to the first short side portion 821a, and are respectively electrically connected to the positive and negative leads of the voice coil 823 at these two corner positions. The two second ends D2 are respectively arranged at both ends of the first short side portion 821a. Specifically, the second ends D2 of the two electrical connection units 8251 are respectively arranged at both ends of the area of the bottom surface 821f of the chassis 821 located on the first short side portion 821a. In this way, the electrical input end of the voice coil 823 is led out to both ends of the first short side portion 821a, and the two second ends D2 form two external connection terminals of the inner core 82, and these two external connection terminals are used to Figures 3 - 4 the electrical connection structure 83 in

[0195] Based on this, please continue to refer to Figure 21 and Figure 22, the electrical connector 825 includes two electrical connection units 8251. The two electrical connection units 8251 are spaced apart along the Y-axis direction. Each electrical connection unit 8251 has a first end D1 and a second end D2. And a part of one of the electrical connection units 8251 is located between the first side magnet 8242a and the third side magnet 8242c, and another part of the one electrical connection unit 8251 is located in the avoidance space M at the corresponding position. A part of the other electrical connection unit 8251 is located between the first side magnet 8242a and the fourth side magnet 8242d, and another part of the other electrical connection unit 8251 is located in the avoidance space M at the corresponding position. The part of the first sub-edge magnetic yoke 8244a located between the two electrical connection units 8251 can be fixed to the middle area of the bottom surface 821f of the chassis 821 located at the first short side portion 821a.

[0196] In the embodiment of the present application, by making the electrical connector 825 include two spaced-apart electrical connection units 8251, on the one hand, the positive and negative poles of the core 82 can be completely spaced apart, improving the reliability of the electrical connection between the core 82 and the electrical connection structure 83; on the other hand, it is convenient to fix the part of the first sub-edge magnetic yoke 8244a located between the two electrical connection units 8251 to the bottom surface of the first short side portion 821a, thereby improving the reliability of the connection between the chassis 821 and the magnetic circuit system 824.

[0197] Of course, the present application is not limited to this. In other embodiments, the electrical connector 825 can also be an integral part. The first sub-edge magnetic yoke 8244a can be fixed to the bottom surface 821f of the chassis 821 by means of the electrical connector 825.

[0198] In order to avoid the electrical connection unit 8251 from hindering the movement of the voice coil 823, in some embodiments, the electrical connection unit 8251 is a flexible electrical connection structure, and the flexible electrical connection structure includes but is not limited to FPC and a structure formed by connecting multiple wires through a flexible structure. It should be noted that the structures of the two electrical connection units 8251 and the connection manners of the two electrical connection units 8251 with the voice coil 823 and the chassis 821 are the same. Hereinafter, the structure of the electrical connection unit 8251 will be described by taking the electrical connection unit 8251 located between the first side magnet 8242a and the third side magnet 8242c as an example.

[0199] Specifically, please continue to refer to Figure 22, the electrical connection unit 8251 includes a main body 82511 and a branch 82512. The main body 82511 is disposed in a region on the bottom surface 821f of the chassis 821 located on the first short side 821a. The main body 82511 extends along the extending direction of the first short side 821a, and a part of the main body 82511 is located between the first side magnet 8242a and the third side magnet 8242c, and another part of the main body 82511 is located in the avoidance space M. One end of the main body 82511 adjacent to the end of the first short side 821a forms a second end D2. The branch 82512 includes a head end 825121, a first end D1, and a connecting section 825122 connected between the head end 825121 and the first end D1. The head end 825121 of the branch 82512 is connected to a part of the main body 82511 located in the avoidance space M. The first end D1 is a movable end and can move relative to the main body 82511. When the first end D1 is forced to move relative to the main body 82511, it can drive the connecting section 825122 of the branch 82512 to move relative to the main body 82511.

[0200] In an embodiment of the present application, by providing an avoidance space M on the magnetic circuit system 824, the connecting section 825122 of the electrical connection unit 8251 is avoided by using the avoidance space M. On the one hand, it is beneficial to set the length of the connecting section 825122 longer, improve the deformation ability of the electrical connection unit 8251, and avoid affecting the moving range of the voice coil 823 in the Z-axis direction due to the shorter setting of the connecting section 825122; on the other hand, when the first end D1 is forced to move relative to the main body 82511, it is convenient for the connecting section 825122 to move relative to the main body 82511, and avoid interference of the magnetic circuit system 824 on the movement of the connecting section 825122.

[0201] On this basis, in order to ensure the balance of the forces on both ends of the voice coil 823 in the X-axis direction. Please continue to refer to Figure 21 and Figure 22 , the core 82 further includes a counterweight balance member 826. The counterweight balance member 826 is connected between the second short side 821b of the chassis 821 and the voice coil 823. The counterweight balance member 826 is symmetrically arranged with respect to the voice coil 823 relative to the electrical connection member 825. Specifically, the counterweight balance member 826 includes two counterweight balance units 8261. The two counterweight balance units 8261 are spaced apart along the extending direction of the second short side 821b. Among them, the structures and materials of the two counterweight balance units 8261 are the same as those of the two electrical connection units 8251, and the connection manners of the two counterweight balance units 8261 with the voice coil 823, the connection manners of the two counterweight balance units 8261 with the chassis 821, and the positional relationships of the two counterweight balance units 8261 with the magnetic circuit system 824 are the same as those of the two electrical connection units 8251, which will not be elaborated here.

[0202] Please refer to Figure 23 , Figure 23 which is a schematic diagram of the magnetic field line emission of the magnetic circuit system 824 shown in Figure 13 . As can be seen from Figure 23 , for the magnetic circuit system 824 disclosed in Example 1, the distribution of magnetic field lines in the magnetic yoke (the first magnetic yoke and the second magnetic yoke) is relatively uniform, and the degree of magnetic saturation is also relatively consistent. This not only improves the magnetic conduction efficiency of the magnetic yoke, but also increases the thickness of the central magnet 8241 and the thickness of the side magnet 8242 corresponding to the second region H2 without changing the shape and size of the magnetic circuit system 824. Therefore, the magnetic flux of the magnetic circuit system 824 can be increased, the magnetic induction intensity of the magnetic circuit system 824 can be improved, and further the driving force of the magnetic circuit system 824 on the voice coil 823 can be increased, and the amplitude of the speaker module 80 can be improved. Specifically, the external sound effect can be improved by 1 - 2 dB compared with the conventional scheme.

[0203] Example 2

[0204] Please refer to Figure 24 , Figure 24 which is a schematic cross-sectional structure diagram of the magnetic circuit system 824 of some other embodiments of the present application. The difference between the magnetic circuit system 824 in this embodiment and the magnetic circuit system 824 in Example 1 is that: the first protrusion 8241a1 and the second protrusion 8241b1 are no longer provided on the central magnet 8241, the first groove 82431 is no longer provided on the first central magnetic yoke 8243, and the second groove 824521 is no longer provided on the second central magnetic yoke 82452. That is to say, the thickness of the central magnet 8241 is equal everywhere, the thickness of the first central magnetic yoke 8243 is equal everywhere, and the thickness of the second central magnetic yoke 82452 is equal everywhere.

[0205] Example 3

[0206] Please refer to Figure 25 , Figure 25 which is a schematic cross-sectional structure diagram of the magnetic circuit system 824 of some other embodiments of the present application. The difference between the magnetic circuit system 824 in this embodiment and the magnetic circuit system 824 in Example 1 is that: the first adaptation region G and the second adaptation region K are no longer provided on the side magnet 8242, the first cooperation region H is no longer provided on the first edge magnetic yoke 8244, and the second cooperation region J is no longer provided on the second edge magnetic yoke 82451. That is to say, the thickness of the side magnet 8242 is equal everywhere, the thickness of the first edge magnetic yoke 8244 is equal everywhere, and the thickness of the second edge magnetic yoke 82451 is equal everywhere.

[0207] Example 4

[0208] Please refer to Figure 26 , Figure 26Schematic cross-sectional structure diagram of the magnetic circuit system 824 according to some other embodiments of the present application. The difference between the magnetic circuit system 824 in this embodiment and the magnetic circuit system 824 in Example 1 is that: the first adaptation region G is no longer provided on the side magnet 8242, and the first mating region H is no longer provided on the first edge magnetic yoke 8244.

[0209] Example Five

[0210] Please refer to Figure 27 , Figure 27 Schematic cross-sectional structure diagram of the magnetic circuit system 824 according to still some other embodiments of the present application. The difference between the magnetic circuit system 824 in this embodiment and the magnetic circuit system 824 in Example 1 is that: the second adaptation region K is no longer provided on the side magnet 8242, and the second mating region J is no longer provided on the second edge magnetic yoke 82451.

[0211] Please return to refer to Figure 12 , as described above, as can be shown from Figure 12 that when using the first central magnetic yoke 8243 with uniform thickness and the second central magnetic yoke 82452 with uniform thickness for magnetic conduction, the closer to the voice coil 823, the more magnetic force lines participating in driving the voice coil 823 are transmitted in the first central magnetic yoke 8243 and the second central magnetic yoke 82452, and the farther away from the voice coil 823, the fewer magnetic force lines participating in driving the voice coil 823 are transmitted in the first central magnetic yoke 8243 and the second central magnetic yoke 82452. The magnetic saturation degree at the position of the first central magnetic yoke 8243 and the second central magnetic yoke 82452 close to the voice coil 823 is relatively large, even reaching the magnetic saturation limit, resulting in the part of the first central magnetic yoke 8243 and the second central magnetic yoke 82452 close to the voice coil 823 being unable to further transmit the magnetic force lines. The design of the magnetic circuit system is unreasonable and is not conducive to further improving the driving force of the magnetic circuit system 824. In the following, without considering the external dimensions of the magnetic circuit system, different embodiments are used to solve the problem of the small driving force of the magnetic circuit system 824.

[0212] Example Six

[0213] Please refer to Figure 28 , Figure 28 Schematic cross-sectional structure diagram of the magnetic circuit system 824 according to still some other embodiments of the present application. This embodiment is the same as the above Figures 5 - 6The magnetic circuit system 824 shown in [figure] is different in that: at the edge of the surface of the first central magnetic yoke 8243 facing away from the central magnet 8241, a first convex portion 82433 is formed, and the first convex portion 82433 extends in the entire circumferential direction of the first central magnetic yoke 8243. This can increase the thickness at the edge of the first central magnetic yoke 8243, thereby increasing the magnetic saturation limit at the edge of the first central magnetic yoke 8243. In this way, more magnetic flux lines can be guided to the voice coil 823 by the first central magnetic yoke 8243, improving the magnetic flux of the magnetic circuit system 824, thereby increasing the driving force of the magnetic circuit system 824 on the voice coil 823, enabling the speaker module 80 to have a larger amplitude, and optimizing the audio performance of the speaker module 80.

[0214] Please continue to refer to Figure 28 , on the part of the surface of the first edge magnetic yoke 8244 facing away from the edge magnet 8242 and adjacent to the first central magnetic yoke 8243, a second convex portion 82446 is formed. This can increase the thickness of the first edge magnetic yoke 8244 at the position adjacent to the voice coil 823, thereby increasing the magnetic saturation limit at the edge of the first edge magnetic yoke 8244. In this way, more magnetic flux lines can be guided to the voice coil 823 by the first edge magnetic yoke 8244, improving the magnetic flux of the magnetic circuit system 824, thereby increasing the driving force of the magnetic circuit system 824 on the voice coil 823, enabling the speaker module 80 to have a larger amplitude, and optimizing the audio performance of the speaker module 80. Of course, the present application is not limited to this, and the second convex portion 82446 may not be provided on the first edge magnetic yoke 8244.

[0215] Please continue to refer to Figure 28 , on the edge of the surface of the second central magnetic yoke 82452 facing away from the central magnet 8241, a third convex portion 82458 is formed, and the third convex portion 82458 extends in the entire circumferential direction of the second central magnetic yoke 82452. This can increase the thickness at the edge of the second central magnetic yoke 82452, thereby increasing the magnetic saturation limit at the edge of the second central magnetic yoke 82452. In this way, more magnetic flux lines can be guided to the voice coil 823 by the second central magnetic yoke 82452, improving the magnetic flux of the magnetic circuit system 824, thereby increasing the driving force of the magnetic circuit system 824 on the voice coil 823, enabling the speaker module 80 to have a larger amplitude, and optimizing the audio performance of the speaker module 80. Of course, it can be understood that the third convex portion 82458 may not be provided on the second central magnetic yoke 82452.

[0216] Please continue to refer to Figure 28, a fourth convex portion 824515 is formed on a portion of the surface of the second edge magnetic yoke 82451 facing away from the edge magnet 8242 and adjacent to the second central magnetic yoke 82452. This can increase the thickness of the second edge magnetic yoke 82451 at a position adjacent to the voice coil 823, thereby increasing the magnetic saturation limit at the edge of the second edge magnetic yoke 82451. In this way, more magnetic flux lines can be guided to the voice coil 823 by the second edge magnetic yoke 82451, improving the magnetic flux of the magnetic circuit system 824, thereby increasing the driving force of the magnetic circuit system 824 on the voice coil 823, enabling the speaker module 80 to have a larger amplitude, and optimizing the audio performance of the speaker module 80. Of course, this application is not limited to this, and the fourth convex portion 824515 may not be provided on the second edge magnetic yoke 82451.

[0217] Since the speaker module 80 provided by the embodiment of this application includes the core 82 described in any of the above embodiments, the two can solve the same technical problems and achieve the same effects.

[0218] Since some embodiments of this application provide an electronic device 100 including the above speaker module 80, the two can solve the same technical problems and achieve the same effects.

[0219] In the description of this specification, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0220] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A kernel (82), characterized in that, It includes a magnetic circuit system (824), and the magnetic circuit system (824) includes a central magnet (8241), side magnets (8242), a first central magnetic yoke (8243), and a second central magnetic yoke (82452); The side magnets (8242) are arranged around the central magnet (8241), the magnetization direction of the side magnets (8242) is opposite to that of the central magnet (8241), and a magnetic gap (824a) is formed between the side magnets (8242) and the central magnet (8241); The central magnet (8241) has a first surface (8241a) and a second surface (8241b) opposite to each other along its own thickness direction. The first central magnetic yoke (8243) is laminated on the first surface (8241a), and a first groove (82431) is formed in the middle of the first central magnetic yoke (8243) facing the first surface (8241a). The second central magnetic yoke (82452) is laminated on the second surface (8241b), and a second groove (824521) is formed in the middle of the second central magnetic yoke (82452) facing the second surface (8241b). In the direction from the center of the first central magnetic yoke (8243) to the outer periphery of the first central magnetic yoke (8243), the distance between the wall surface of the first groove (82431) and the first surface (8241a) gradually decreases; A first protrusion (8241a1) is provided on the first surface (8241a), a second protrusion (8241b1) is provided on the second surface (8241b), the first protrusion (8241a1) is fitted in the first groove (82431), and the second protrusion (8241b1) is fitted in the second groove (824521).

2. The kernel (82) according to claim 1, characterized in that, The wall surface of the first groove (82431) is a spherical crown surface or a conical surface.

3. The kernel (82) according to claim 1, characterized in that, The thickness of the first central magnetic yoke (8243) at the first groove (82431) is less than the thickness of the first central magnetic yoke (8243) at other positions.

4. The kernel (82) according to claim 1, characterized in that, In the direction from the center of the second central magnetic yoke (82452) to the outer periphery of the second central magnetic yoke (82452), the distance between the wall surface of the second groove (824521) and the second surface (8241b) gradually decreases.

5. The kernel (82) according to claim 1, characterized in that, The thickness of the second central magnetic yoke (82452) at the second groove (824521) is less than the thickness of the second central magnetic yoke (82452) at other positions.

6. The kernel (82) according to claim 1, characterized in that, The magnetic circuit system (824) further includes a first edge magnetic yoke (8244); The first edge magnetic yoke (8244) is laminated on the surface of the side magnets (8242) facing the same direction as the first surface (8241a). The first edge magnetic yoke (8244) is located on the outer periphery of the first central magnetic yoke (8243) and is separated from the first central magnetic yoke (8243); A first mating region (H) is formed on the surface of the first edge magnetic yoke (8244) facing the side magnet (8242). The first mating region (H) includes a first region (H1) and a second region (H2). The second region (H2) is located on the side of the first region (H1) away from the first central magnetic yoke (8243). The distance between the second region (H2) and the plane (X) where the central magnet (8241) is located is greater than the distance between the first region (H1) and the plane (X) where the central magnet (8241) is located. A first adaptation region (G) is formed on the surface of the side magnet (8242) facing the first edge magnetic yoke (8244). The first adaptation region (G) includes a first sub - adaptation region (G1) and a second sub - adaptation region (G2). The second sub - adaptation region (G2) is located on the side of the first sub - adaptation region (G1) away from the central magnet (8241). The distance between the second sub - adaptation region (G2) and the plane (X) where the central magnet (8241) is located is greater than the distance between the first sub - adaptation region (G1) and the plane (X) where the central magnet (8241) is located. The second sub - adaptation region (G2) is adapted to the second region (H2), and the first sub - adaptation region (G1) is adapted to the first region (H1).

7. The kernel (82) according to claim 6, characterized in that, The thickness of the first edge magnetic yoke (8244) at the first region (H1) is greater than the thickness of the first edge magnetic yoke (8244) at the second region (H2). The thickness of the side magnet (8242) at the second sub - adaptation region (G2) is greater than the thickness of the side magnet (8242) at the first sub - adaptation region (G1).

8. The kernel (82) according to claim 6, characterized in that, The width dimension of the first region (H1) is d, and the thickness dimension of the first edge magnetic yoke (8244) corresponding to the first region (H1) is h. The d and h satisfy: d≥0.5h.

9. The kernel (82) according to claim 6, characterized in that, In the direction from the center of the first central magnetic yoke (8243) to the outer periphery of the first central magnetic yoke (8243), the second region (H2) extends obliquely away from the plane (X) where the central magnet (8241) is located from the first region (H1).

10. The kernel (82) according to claim 6, characterized in that, The side magnet (8242) includes a first side magnet (8242a), a second side magnet (8242b), a third side magnet (8242c), and a fourth side magnet (8242d) spaced apart from each other. The first side magnet (8242a) and the second side magnet (8242b) are respectively arranged on opposite sides of the central magnet (8241). The third side magnet (8242c) and the fourth side magnet (8242d) are respectively arranged on the other opposite sides of the central magnet (8241), and the arrangement direction of the third side magnet (8242c) and the fourth side magnet (8242d) is perpendicular to the arrangement direction of the first side magnet (8242a) and the second side magnet (8242b). The first edge magnetic yoke (8244) includes: spaced-apart first sub-edge magnetic yokes (8244a), second sub-edge magnetic yokes (8244b), third sub-edge magnetic yokes (8244c), and fourth sub-edge magnetic yokes (8244d). The first sub-edge magnetic yoke (8244a) is adapted to the first side magnet (8242a), the second sub-edge magnetic yoke (8244b) is adapted to the second side magnet (8242b), the third sub-edge magnetic yoke (8244c) is adapted to the third side magnet (8242c), and the fourth sub-edge magnetic yoke (8244d) is adapted to the fourth side magnet (8242d). The first mating regions (H) are respectively formed on the first sub-edge magnetic yoke (8244a) and the second sub-edge magnetic yoke (8244b).

11. The kernel (82) according to claim 10, characterized in that, It further includes a chassis (821), a voice coil (823), and an electrical connector (825); The magnetic circuit system (824) is fixed on the surface of the chassis (821) that faces the same direction as the second surface (8241b). The voice coil (823) is located within the chassis (821), and a part of the voice coil (823) extends into the magnetic gap (824a). The chassis (821) is in a rectangular frame shape. The chassis (821) includes a first short side portion (821a) and a second short side portion (821b) that are oppositely arranged. The extending directions of the first short side portion (821a) and the second short side portion (821b) are the same as the arrangement direction of the third side magnet (8242c) and the fourth side magnet (8242d). The electrical connector (825) electrically connects the voice coil (823) and is fixed between the first short side portion (821a) and the voice coil (823).

12. The kernel (82) according to claim 11, characterized in that, The voice coil (823) is in a rectangular frame shape. The extending directions of two adjacent side portions of the voice coil (823) are respectively the same as the length direction and the width direction of the chassis (821). The electrical connector (825) has two first ends (D1). The two first ends (D1) of the electrical connector (825) are respectively connected to two corner positions of the voice coil (823) adjacent to the first short side portion (821a).

13. The kernel (82) according to claim 12, characterized in that, The electrical connector (825) has two second ends (D2). The two second ends (D2) of the electrical connector (825) are respectively arranged at both ends of the first short side portion (821a), and the two second ends (D2) are respectively electrically connected to the two first ends (D1) in a one-to-one correspondence.

14. The kernel (82) according to claim 13, characterized in that, The electrical connector (825) includes two electrical connection units (8251). The two electrical connection units (8251) are spaced apart in the extending direction of the first short side portion (821a). Each electrical connection unit (8251) has one first end (D1) and one second end (D2), and the first end (D1) and the second end (D2) of each electrical connection unit (8251) are electrically connected; The first short side portion (821a) faces the first sub-edge magnetic yoke (8244a), and a portion of the first sub-edge magnetic yoke (8244a) located between the two electrical connection units (8251) is fixed to a surface of the first short side portion (821a) that faces the same direction as the second surface (8241b).

15. The core (82) according to claim 14, characterized in that, Avoidance notches (8244aa) are respectively formed at two ends of the first sub-edge magnetic yoke (8244a) along the extending direction of the first short side portion (821a), and the avoidance notches (8244aa) extend to a side edge of the first sub-edge magnetic yoke (8244a) away from the second sub-edge magnetic yoke (8244b); Avoidance regions (8242aa) are respectively formed at least at portions of a surface of the first edge magnet (8242a) facing the first sub-edge magnetic yoke (8244a) that are aligned with the two avoidance notches (8244aa); Each avoidance notch (8244aa) and the avoidance region (8242aa) at the corresponding position define an avoidance space (M), and the avoidance space (M) is used to avoid the electrical connection unit (8251) at the corresponding position.

16. The core (82) according to any one of claims 10 - 15, characterized in that, The first mating regions (H) are respectively formed on the third sub-edge magnetic yoke (8244c) and the fourth sub-edge magnetic yoke (8244d).

17. The core (82) according to claim 6, characterized in that, A surface of the first edge magnetic yoke (8244) facing away from the edge magnet (8242) and a surface of the first central magnetic yoke (8243) facing away from the central magnet (8241) are coplanar.

18. The core (82) according to claim 1, characterized in that, The magnetic circuit system (824) further includes a second edge magnetic yoke (82451); The second edge magnetic yoke (82451) is provided on a surface of the edge magnet (8242) that faces the same direction as the second surface (8241b), and is located on the outer periphery of the second central magnetic yoke (82452); A second mating region (J) is formed on a surface of the second edge magnetic yoke (82451) facing the edge magnet (8242), and the second mating region (J) includes a connected third region (J1) and a fourth region (J2), the fourth region (J2) is located on a side of the third region (J1) away from the second central magnetic yoke (82452), and a distance between the fourth region (J2) and a plane (X) where the central magnet (8241) is located is greater than a distance between the third region (J1) and the plane (X) where the central magnet (8241) is located; The surface of the side magnet (8242) facing the second edge magnetic yoke (82451) is formed with a second adaptation region (K), the second adaptation region (K) includes a third sub - adaptation region (K1) and a fourth sub - adaptation region (K2), the fourth sub - adaptation region (K2) is located on the side of the third sub - adaptation region (K1) away from the central magnet (8241), the distance between the fourth sub - adaptation region (K2) and the plane (X) where the central magnet (8241) is located is greater than the distance between the third sub - adaptation region (K1) and the plane (X) where the central magnet (8241) is located, the fourth sub - adaptation region (K2) is adapted to the fourth region (J2), and the third sub - adaptation region (K1) is adapted to the third region (J1).

19. The core (82) according to claim 18, characterized in that, In the direction from the center of the second central magnetic yoke (82452) to the outer periphery of the second central magnetic yoke (82452), the fourth region (J2) extends obliquely from the third region (J1) in a direction away from the plane (X) where the central magnet (8241) is located.

20. The core (82) according to claim 18 or 19, characterized in that, The side magnet (8242) includes a spaced - apart first side magnet (8242a) and a second side magnet (8242b); The first side magnet (8242a) and the second side magnet (8242b) are respectively disposed on opposite sides of the central magnet (8241); At least the portions of the second edge magnetic yoke (82451) respectively facing the first side magnet (8242a) and the second side magnet (8242b) are respectively formed with the second mating region (J).

21. The core (82) according to claim 20, characterized in that, The side magnet (8242) includes a spaced - apart third side magnet (8242c) and a fourth side magnet (8242d); The third side magnet (8242c) and the fourth side magnet (8242d) are respectively disposed on the other opposite sides of the central magnet (8241), and the arrangement direction of the third side magnet (8242c) and the fourth side magnet (8242d) is perpendicular to the arrangement direction of the first side magnet (8242a) and the second side magnet (8242b). At least the portions of the second edge magnetic yoke (82451) respectively facing the third side magnet (8242c) and the fourth side magnet (8242d) are respectively formed with the second mating region (J).

22. The core (82) according to claim 21, characterized in that, The second edge magnetic yoke (82451) is in a rectangular ring shape, and the entire surface of the second edge magnetic yoke (82451) facing the side magnet (8242) is formed with the second mating region (J).

23. The core (82) according to claim 18, characterized in that, The second edge magnetic yoke (82451) is connected to the second central magnetic yoke (82452) through a connecting magnetic yoke portion (82453), and the connecting magnetic yoke portion (82453) is facing the magnetic gap (824a).

24. The core (82) according to claim 23, characterized in that, The thickness of the connecting magnetic yoke portion (82453), the thickness of the second edge magnetic yoke (82451) at the third region (J1), and the thickness of the portion of the second center magnetic yoke (82452) where the second groove (824521) is not provided are equal.

25. The core (82) according to claim 18, characterized in that, A side surface of the second edge magnetic yoke (82451) facing away from the edge magnet (8242) and a side surface of the second center magnetic yoke (82452) facing away from the center magnet (8241) are coplanar.

26. A speaker module (80), characterized in that, The invention comprises a shell (81) and a core (82) as claimed in any one of claims 1 to 25, wherein the core (82) is arranged in the shell (81), and the shell (81) is divided into a front cavity (C1) and a rear cavity (C2) by a diaphragm group (822) of the core (82), the voice coil (823) and the magnetic circuit system (824) of the core (82) are both located in the rear cavity (C2), and a sound outlet channel (80a) is provided on the shell (81), and the front cavity (C1) is connected to the sound outlet channel (80a).

27. An electronic device (100), characterized in that, The invention comprises a housing (10), a main board and the speaker module (80) according to claim 26, wherein the main board and the speaker module (80) are arranged in the housing (10), and the speaker module (80) is electrically connected to the main board, and a sound outlet hole (11a) is provided on the housing (10), and the sound outlet channel (80a) is connected to the sound outlet hole (11a).

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