Sound production device, sound production module and electronic equipment

Abstract

The utility model discloses a sounding device, a sounding module and an electronic device, and relates to the technical field of electroacoustic transduction, a vibrating plate of a vibrating system of the sounding device comprises a first plate part and a second plate part which are located on different horizontal planes, the top of a voice coil is connected with the first plate part, and the second plate part is located on the inner side of the voice coil. The periphery of the second plate part abuts against the inner circumferential wall of the voice coil, a center magnetic part of the magnetic circuit system comprises two center magnets which are oppositely arranged at intervals, the two center magnets are located on the two opposite sides of the second plate part, and the projections of the two center magnets in the first direction are located on the inner side of the voice coil; the sides, facing the vibrating diaphragm assembly, of the two central magnets are exposed in the internal cavity of the sound production device. The two center magnets are magnetized in the first direction, and the magnetizing directions are opposite. According to the sounding device, the thinning design can be realized, and the BL value can be effectively improved, so that the distribution of magnetic lines is more uniform, the BLx curve is smoother, and the distortion is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electroacoustic transduction technology, and in particular to a sound-generating device, a sound-generating module and electronic equipment using the sound-generating device. Background Technology

[0002] In recent years, with the further development of science and technology, the field of smart electronics has also ushered in a period of rapid development. People have put forward more demands for the development of smart terminal electronic products, gradually forming new trends such as high performance, miniaturization, and thinness in electronic products. As the sound-producing unit of smart electronic products, the high performance, high sound quality, and thinness of speakers have gradually become the mainstream demands of consumers.

[0003] In related technologies, loudspeakers generate a magnetic field through a central magnet and side magnets. The voice coil is located within this magnetic field. When an alternating current is applied to the voice coil, it reciprocates within the magnetic field, causing the diaphragm to move and thus pushing air to produce sound. The magnetic field formed by the central and side magnets is stronger near the central and side magnets and weaker further away. During the voice coil's reciprocating motion, when the voice coil moves away from the central and side magnets, the magnetic field is weaker, leading to insufficient magnetic force and affecting the loudspeaker's sound performance. Furthermore, the central magnet of a loudspeaker is typically designed as a central magnet + central washer structure, with most of the magnetic field lines concentrated near the central washer. Under large displacement, the BLx curve attenuates significantly and has poor flatness, resulting in low loudspeaker performance and high distortion. Moreover, the large displacement structural design makes it impossible to meet the demands for thinner and smaller loudspeakers. Utility Model Content

[0004] The main purpose of this invention is to provide a sound-generating device, a sound-generating module, and an electronic device, which aims to solve the problem that insufficient magnetic force affects sound performance when the voice coil is far away from the central and peripheral magnetic parts during the reciprocating motion of the voice coil. This sound-generating device not only achieves a thinner design but also effectively increases the volume of the magnet, improves the BL value of the product, makes the magnetic field lines more uniformly distributed, and the BLx curve flatter, thereby reducing distortion.

[0005] To achieve the above objectives, this utility model proposes a sound-generating device, which includes:

[0006] A vibration system vibrates along a first direction. The vibration system includes a diaphragm assembly and a voice coil. The diaphragm assembly includes a diaphragm and a diaphragm plate. The inner periphery of the diaphragm is connected to the diaphragm plate. The diaphragm plate includes a first plate portion and a second plate portion located on different horizontal planes. The top of the voice coil is connected to the first plate portion. The second plate portion is located inside the voice coil, and the outer periphery of the second plate portion abuts against the inner peripheral wall of the voice coil.

[0007] A magnetic circuit system is provided with a magnetic gap. The end of the voice coil away from the first plate is suspended in the magnetic gap. The magnetic circuit system includes a central magnetic part, which includes two central magnets that are arranged opposite to each other and spaced apart along the first direction. The two central magnets are located on opposite sides of the second plate. The projections of the two central magnets along the first direction are located inside the voice coil, and the sides of the two central magnets facing the diaphragm assembly are exposed in the internal cavity of the sound-generating device.

[0008] Both central magnets are magnetized along the first direction but in opposite directions.

[0009] In one embodiment, the diaphragm further includes a third plate portion located inside the voice coil and in contact with the inner peripheral wall of the voice coil. The third plate portion is connected to the first plate portion and the second plate portion at its two ends along the first direction, respectively.

[0010] The first plate, the third plate, and the second plate are integrally formed structures.

[0011] In one embodiment, the vibration system further includes a waterproof membrane, the waterproof membrane comprising a first connecting portion located at the top of the voice coil, a second connecting portion fitted and connected to the inner peripheral wall of the voice coil, and a third connecting portion located inside the voice coil, wherein the first plate portion is connected to the first connecting portion, and the second plate portion is connected to the third connecting portion.

[0012] In one embodiment, the first connecting portion is sandwiched between the first plate portion and the top of the voice coil;

[0013] And / or, the second plate portion is located on the side of the third connecting portion facing the top of the voice coil;

[0014] And / or, the first connecting part, the second connecting part and the third connecting part are integrally formed structures;

[0015] And / or, the extension length of the second connecting portion along the first direction is less than the extension length of the voice coil along the first direction;

[0016] And / or, the first connecting portion and the third connecting portion are respectively connected to the two ends of the second connecting portion along the first direction.

[0017] In one embodiment, the outer periphery of the first plate portion is recessed and bent toward the voice coil to form a stepped portion, and the inner periphery of the diaphragm is supported and overlapped with the stepped portion;

[0018] And / or, along the first direction, the distances between the opposite sides of the second plate and the corresponding central magnets are the same.

[0019] In one embodiment, the magnetic circuit system further includes a first magnetic yoke and a second magnetic yoke disposed opposite to each other, and the two central magnets include a first central magnet and a second central magnet, the side of the first central magnet facing away from the diaphragm assembly being connected to the first magnetic yoke, and the side of the second central magnet facing away from the diaphragm assembly being connected to the second magnetic yoke.

[0020] In one embodiment, the magnetic circuit system further includes a side magnetic portion disposed on the second magnetic yoke, the side magnetic portion being located outside the second central magnet and spaced apart from the second central magnet to form the magnetic gap.

[0021] In one embodiment, the edge magnetic part includes an edge magnet and an edge magnetic plate stacked together, and the edge magnet is connected to the second magnetic yoke;

[0022] Wherein, the projection of the side magnetic plate along the direction perpendicular to the first direction is located between the top and bottom of the voice coil; and / or, the projection of the side magnetic plate along the direction perpendicular to the first direction is located between the surfaces of the first center magnet and the second center magnet facing the diaphragm assembly; and / or, the thickness of the side magnet along the first direction is greater than the thickness of the second center magnet along the first direction.

[0023] In one embodiment, the second magnetic yoke includes a bottom and a side portion formed by bending and extending the periphery of the bottom toward the diaphragm assembly, wherein the second central magnet is disposed on the bottom and spaced from the side portion to form the magnetic gap.

[0024] In one embodiment, the outer periphery of the first magnetic yoke bends and extends toward the second magnetic yoke to form a first welded portion, and the first welded portion is welded to the outer periphery of the second magnetic yoke;

[0025] And / or, the outer periphery of the second magnetic yoke bends and extends toward the first magnetic yoke to form a second welded portion, and the second welded portion is welded to the outer periphery of the first magnetic yoke.

[0026] In one embodiment, the sound-generating device further includes a housing, which is connected to the first magnetic yoke and the second magnetic yoke respectively and is located between the first magnetic yoke and the second magnetic yoke. The first magnetic yoke includes at least a top plate portion located on the side of the diaphragm assembly facing away from the second magnetic yoke. The first central magnet is disposed on the top plate portion. The outer periphery of the diaphragm is connected to the end of the housing away from the second magnetic yoke, and the diaphragm is opposite to and spaced from the top plate portion.

[0027] In one embodiment, the first magnetic yoke further includes a side plate portion disposed at an angle to the top plate portion, the side plate portion being bent toward the side of the diaphragm assembly to form a support platform, and the outer periphery of the diaphragm being sandwiched between the housing and the support platform;

[0028] And / or, the outer shell is a plastic shell, and the outer shell and the first magnetic yoke are integrally injection molded.

[0029] In one embodiment, the magnetic circuit system further includes a side magnetic portion disposed on the second magnetic yoke. The side magnetic portion is located outside the second central magnet and spaced apart from the second central magnet to form the magnetic gap. The side magnetic portion includes a side magnet and a side magnetic guide plate stacked together. The side magnet is connected to the second magnetic yoke, and the side magnetic guide plate is connected to the outer shell.

[0030] The side magnetic plate and the outer shell are integrally formed.

[0031] In one embodiment, a first cavity is formed between the first magnetic yoke and the diaphragm assembly, the first central magnet is located in the first cavity, and the sound-generating device is further provided with a sound outlet communicating with the first cavity;

[0032] The sound outlet is located in the outer casing;

[0033] Alternatively, the first magnetic yoke includes a top plate portion and a side plate portion arranged at an angle, with the sound outlet located on the top plate portion and opposite to the diaphragm; or, the sound outlet is located on the side plate portion.

[0034] Alternatively, the sound outlet may be located at the connection between the outer casing and the first magnetic yoke.

[0035] In one embodiment, the two center magnets include a first center magnet and a second center magnet, the first center magnet being located near the top of the voice coil and the second center magnet being located near the bottom of the voice coil;

[0036] Wherein, the magnetic energy product of the first central magnet is greater than the magnetic energy product of the second central magnet; or, the volume of the first central magnet is greater than the volume of the second central magnet; or, the outer contours of the first central magnet and the second central magnet are the same, and the thickness of the first central magnet along the first direction is greater than the thickness of the second central magnet along the first direction.

[0037] This utility model also proposes a sound-generating module, the sound-generating module comprising:

[0038] Module housing, the module housing having a receiving cavity; and

[0039] The aforementioned sound-generating device is disposed within the receiving cavity, which divides the receiving cavity into a front cavity and a rear cavity;

[0040] The module housing is provided with a sound outlet that communicates with the front cavity.

[0041] In one embodiment, the sound outlet is directly opposite the diaphragm assembly of the sound-generating device, so that the sound-generating module has a front-emitting structure; or, the sound outlet is located on one side of the sound-generating device, so that the sound-generating module has a side-emitting structure.

[0042] And / or, the module housing is also provided with a sound vent hole that communicates with the rear cavity.

[0043] This utility model also proposes an electronic device, which includes the sound-generating module described above;

[0044] Alternatively, the electronic device may include the sound-generating device described above.

[0045] The sound-generating device of this utility model has a magnetic gap in the magnetic circuit system and a vibration system consisting of a diaphragm assembly and a voice coil. One end of the voice coil is suspended in the magnetic gap. Current is passed into the voice coil, causing it to reciprocate in the magnetic field formed by the magnetic circuit system, which in turn moves the diaphragm assembly along a first direction, thereby pushing air to produce sound. Simultaneously, the central magnetic part of the magnetic circuit system consists of two central magnets positioned opposite each other and spaced apart along the first direction. The inner periphery of the diaphragm of the diaphragm assembly is connected to a vibrating plate, which is configured as a first plate and a second plate located on different horizontal planes along the first direction. The top of the voice coil is connected to the first plate, and the second plate is located inside the voice coil, with its outer periphery abutting against the inner wall of the voice coil. This positions the two central magnets on opposite sides of the second plate, with their projections along the first direction located inside the voice coil. The sides of the two central magnets facing the diaphragm assembly are exposed within the internal cavity of the sound-generating device. Magnetizing along the first direction with opposite magnetization directions enhances the magnetic field strength in the voice coil region using two central magnets, thereby increasing the magnetic force on the voice coil. Even when the voice coil moves away from the magnetic gap, the magnetic force on the voice coil is still enhanced under the action of the two central magnets, thus increasing the volume, improving sound quality, and enhancing the acoustic performance of the sound-generating device. Furthermore, by using a first plate and a second plate located on different horizontal planes along the first direction, and with the projection of the two central magnets along the first direction located inside the voice coil, the voice coil and the second plate provide accommodating space for the two central magnets during the movement of the diaphragm assembly. This allows the two central magnets to be closer to the voice coil, resulting in a magnetic field enhancement effect. This effectively solves the problem of insufficient magnetic force affecting acoustic performance when the voice coil moves away from the magnetic gap during reciprocating motion. The elimination of the conventional central washer structure for the two central magnets not only enables a thinner design but also results in a more uniform distribution of magnetic lines of force and a flatter BLx curve, thereby reducing distortion. Moreover, under the same volume requirements, since there is no central washer structure, the volume of the two central magnets can be made larger, thereby improving the product's BL value. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0047] Figure 1 A schematic diagram of the structure of an embodiment of the sound-generating device provided by this utility model;

[0048] Figure 2 A top view of an embodiment of the sound-generating device provided by this utility model;

[0049] Figure 3 An exploded view of an embodiment of the sound-generating device provided by this utility model;

[0050] Figure 4 A cross-sectional schematic diagram of an embodiment of the sound-generating device provided by this utility model;

[0051] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0052] Figure 6 An exploded view of another embodiment of the sound-generating device provided by this utility model;

[0053] Figure 7 A cross-sectional schematic diagram of another embodiment of the sound-generating device provided by this utility model;

[0054] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0055] Figure 9 An exploded view of the vibrating plate and waterproof membrane in one embodiment of the sound-generating device provided by this utility model;

[0056] Figure 10 A schematic diagram of the structure of the vibrating plate in one embodiment of the sound-generating device provided by this utility model;

[0057] Figure 11 A cross-sectional schematic diagram of the vibrating plate in one embodiment of the sound-generating device provided by this utility model;

[0058] Figure 12 A schematic diagram of the structure of the first magnetic yoke in one embodiment of the sound-generating device provided by this utility model;

[0059] Figure 13 A schematic diagram of the structure of the first magnetic yoke in another embodiment of the sound-generating device provided by this utility model;

[0060] Figure 14 A schematic diagram of the structure of an embodiment of the sound-generating module provided by this utility model;

[0061] Figure 15 A cross-sectional schematic diagram of an embodiment of the sound-generating module provided by this utility model;

[0062] Figure 16 A schematic diagram of another embodiment of the sound-generating module provided by this utility model;

[0063] Figure 17A cross-sectional schematic diagram of another embodiment of the sound-generating module provided by this utility model;

[0064] Figure 18 A simulation effect diagram of an embodiment of the sound-generating device provided by this utility model.

[0065] Explanation of icon numbers:

[0066] 100. Sound-generating device; 1. Housing; 11. First cavity; 2. Vibration system; 21. Diaphragm assembly; 211. Diaphragm; 212. Vibrating plate; 2121. First plate portion; 2122. Step portion; 2123. Second plate portion; 2124. Third plate portion; 2125. Receiving groove; 22. Voice coil; 23. Waterproof membrane; 231. First connecting portion; 232. Second connecting portion; 233. Third connecting portion; 3. Magnetic circuit system; 31. First Magnetic yoke; 311, top plate; 312, side plate; 313, support platform; 314, sound outlet; 315, first welding part; 32, second magnetic yoke; 321, second recessed groove; 33, central magnetic part; 331, first central magnet; 332, second central magnet; 34, side magnetic part; 341, side magnet; 342, side magnetic guide plate; 35, magnetic gap; 400, module housing; 410, sound outlet; 420, rear cavity; 500, sound-generating module.

[0067] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0068] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0069] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0070] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0071] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0072] This utility model proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applied to electronic devices, such as mobile phones, headphones, smart wearable devices, etc., and is not limited thereto.

[0073] Please refer to the reference. Figures 1 to 13 As shown, in this embodiment of the present invention, the sound-generating device 100 includes a vibration system 2 and a magnetic circuit system 3. The vibration system 2 vibrates along a first direction. The vibration system 2 includes a diaphragm assembly 21 and a voice coil 22. The diaphragm assembly 21 includes a diaphragm 211 and a vibrating plate 212. The inner periphery of the diaphragm 211 is connected to the vibrating plate 212. The vibrating plate 212 includes a first plate portion 2121 and a second plate portion 2123 located on different horizontal planes. The top of the voice coil 22 is connected to the first plate portion 2121. The second plate portion 2123 is located inside the voice coil 22, and the outer periphery of the second plate portion 2123 is connected to the voice coil. The inner peripheral wall of the voice coil 22 is abutted against the magnetic circuit system 3, which has a magnetic gap 35. The end of the voice coil 22 away from the first plate 2121 is suspended in the magnetic gap 35. The magnetic circuit system 3 includes a central magnetic part 33, which includes two central magnets that are arranged opposite to each other and spaced apart along the first direction. The two central magnets are located on opposite sides of the second plate 2123. The projection of the two central magnets along the first direction is located inside the voice coil 22, and the side of the two central magnets facing the diaphragm assembly 21 is exposed in the internal cavity of the sound generating device 100. The two central magnets are magnetized along the first direction and the magnetization directions are opposite.

[0074] In this embodiment, the sound-generating device 100 can be a single unit of a loudspeaker, and the loudspeaker can be a miniature loudspeaker. It should be noted that the magnetic circuit system 3 and the vibration system 2 of the sound-generating device 100 are arranged opposite to each other.

[0075] It is understood that the magnetic circuit system 3 and vibration system 2 of the sound-generating device 100 can be mounted and fixed through the housing 1, that is, the magnetic circuit system 3 and vibration system 2 are fixed to the housing 1, so that the sound-generating device 100 can be used as an independent component in electronic devices or sound-generating modules, which is not limited here. Of course, in other embodiments, the outer periphery of the diaphragm 211 in the vibration system 2 can be directly fixed to the magnetic circuit system 3; or, the magnetic circuit system 3 and vibration system 2 of the sound-generating device 100 can be installed as separate structures in the housing of electronic devices or sound-generating modules, which is not limited here.

[0076] Optionally, the outer contour of the sound-generating device 100 can be circular or square, so that the outer contours of the outer shell 1, the magnetic circuit system 3, and the vibration system 2 are correspondingly set to circular or square, depending on actual needs, and are not limited here. In this embodiment, the outer shell 1 can be a frame or frame structure, that is, the outer shell 1 has a cavity with openings at both ends. The magnetic circuit system 3 is connected to the outer shell 1, and the vibration system 2 is connected to the outer shell 1 and is opposite to and spaced from the magnetic circuit system 3. The outer shell 1 can be a steel sheet structure or a plastic structure, and is not limited here.

[0077] Optionally, the outer casing 1 can be a single integral structure or formed by the combination of multiple separate structures; no limitation is made here. Understandably, the casing 1 is provided with conductive terminals, and the voice coil 22 is electrically connected to these conductive terminals. This facilitates the connection and conduction of the voice coil 22 with an external circuit via the conductive terminals.

[0078] In this embodiment, the two central magnets include a first central magnet 331 and a second central magnet 332. The first central magnet 331 is located near the top of the voice coil 22, and the second central magnet 332 is located near the bottom of the voice coil 22. It can be understood that the top of the voice coil 22 is the end where it connects to the first plate portion 2121, and the bottom of the voice coil 22 is the end where it is suspended in the magnetic gap 35.

[0079] Understandably, by placing the first center magnet 331 and the second center magnet 332 on opposite sides of the second plate portion 2123, and with the projections of the two center magnets along the first direction located inside the voice coil 22, when the voice coil 22 drives the diaphragm assembly 21 to vibrate, the second plate portion 2123 vibrates between the first center magnet 331 and the second center magnet 332. At this time, the voice coil 22 and the second plate portion 2123 cooperate to accommodate the first center magnet 331 and the second center magnet 332, and make the voice coil 22 close to the first center magnet... When the iron 331 is near the magnetic field of the first central magnet 331, the voice coil 22 is near the magnetic field of the second central magnet 332. This increases the magnetic field strength in the area where the voice coil 22 is located, thereby increasing the magnetic force on the voice coil 22. Even when the voice coil 22 moves to the side away from the magnetic gap 35, the magnetic force on the voice coil 22 will be increased under the action of the first central magnet 331 and the second central magnet 332, thereby increasing the volume, improving the sound quality, and improving the acoustic performance of the sound-generating device 100.

[0080] Meanwhile, by setting the central magnetic part 33 of the magnetic circuit system 3 as a first central magnet 331 and a second central magnet 332, and exposing the side of the first central magnet 331 and the second central magnet 332 facing the diaphragm assembly 21 in the internal cavity of the sound-generating device 100, the two central magnets (i.e., the first central magnet 331 and the second central magnet 332) are magnetized along the first direction and in opposite directions. Compared with the magnetic circuit structure of a conventional loudspeaker, the central magnetic part 33 of this invention eliminates the central washer (or central magnetic guide plate) structure, thereby reducing the thickness of the sound-generating device in the Z direction. Moreover, the first central magnet 331 and the second central magnet 332 are opposite to each other along the first direction and in opposite directions, forming a magnetically opposed structure. The magnetic lines of force generated by the first central magnet 331 and the second central magnet 332 repel each other and are transmitted to the outside of the voice coil 22, thereby making the magnetic lines of force distribution more uniform. When the voice coil 22 vibrates back and forth along the first direction, it can be in a dense magnetic field region, thereby making the BLx curve flatter and reducing distortion. Figure 18 As shown; and, under the premise that the thickness of the sound-generating device is certain, the central magnetic part 33 of this utility model eliminates the central washer (or central magnetic plate) structure, so that the first central magnet 331 and the second central magnet 332 can effectively increase the volume of the central magnetic part 33 and improve the BL value.

[0081] Optionally, the voice coil 22 is an annular voice coil extending along the first direction. Thus, the diaphragm 212 is configured as a first plate portion 2121 and a second plate portion 2123 located on different horizontal planes along the first direction, such that the top of the voice coil 22 is connected to the first plate portion 2121, that is, the voice coil 22 is fixed by the first plate portion 2121, and the second plate portion 2123 is located inside the voice coil 22, and the outer periphery of the second plate portion 2123 abuts against the inner peripheral wall of the voice coil 22. The first plate portion 2121 and the second plate portion 2123 on different horizontal planes can achieve a centering effect on the vibration of the voice coil 22. At the same time, during the vibration of the voice coil 22, the voice coil 22 and the second plate portion 2123 cooperate to provide a accommodating space for the first central magnet 331, ensuring the normal operation of the sound generating device 100.

[0082] The sound-generating device 100 of this invention features a magnetic gap 35 in the magnetic circuit system 3 and a vibration system 2 consisting of a diaphragm assembly 21 and a voice coil 22. One end of the voice coil 22 is suspended within the magnetic gap 35. Current is supplied to the voice coil 22, causing it to reciprocate within the magnetic field formed by the magnetic circuit system 3, thus moving the diaphragm assembly 21 along a first direction and thereby pushing air to produce sound. Simultaneously, the central magnetic part 33 of the magnetic circuit system 3 is configured with two central magnets positioned opposite each other and spaced apart along the first direction, and the inner periphery of the diaphragm 211 of the diaphragm assembly 21 is connected to the vibrating plate. The diaphragm assembly 212 is connected, and the diaphragm 212 is configured as a first plate portion 2121 and a second plate portion 2123 located on different horizontal planes along a first direction, such that the top of the voice coil 22 is connected to the first plate portion 2121, the second plate portion 2123 is located inside the voice coil 22, and the outer periphery of the second plate portion 2123 abuts against the inner peripheral wall of the voice coil 22. This allows the two central magnets to be located on opposite sides of the second plate portion 2123, and the projection of the two central magnets along the first direction is located inside the voice coil 22. The side of the two central magnets facing the diaphragm assembly 21 is exposed to the internal cavity of the sound-generating device 100. Within the body, two central magnets are magnetized along a first direction but in opposite directions, thereby increasing the magnetic field strength in the region where the voice coil 22 is located. This also improves the flatness of the BLx curve. Even when the voice coil 22 moves away from the magnetic gap 35, the magnetic force on the voice coil 22 is increased under the action of the two central magnets, thereby increasing the volume, improving the sound quality, and enhancing the acoustic performance of the sound-generating device 100. Furthermore, utilizing the first plate portion 2121 and the second plate portion 2123 of the diaphragm 212 located on different horizontal planes along the first direction, and the two central magnets along the first direction... The projection in one direction is located inside the voice coil 22. Thus, during the movement of the diaphragm assembly 21, the voice coil 22 and the second plate 2123 provide space for the two central magnets, allowing them to be closer to the voice coil 22 and enhancing the magnetic field. This effectively solves the problem of insufficient magnetic force affecting acoustic performance when the voice coil 22 moves away from the magnetic gap 35 during its reciprocating motion. The elimination of the conventional center washer structure in the two central magnets not only allows for a thinner design, resulting in a more uniform distribution of magnetic lines of force and a flatter BLx curve, thus reducing distortion, but also allows for a larger volume of the two central magnets under the same volume requirements, thereby increasing the product's BL value.

[0083] In one embodiment, the diaphragm 212 further includes a third plate portion 2124, which is located inside the voice coil 22 and is fitted and connected to the inner peripheral wall of the voice coil 22. The two ends of the third plate portion 2124 along the first direction are respectively connected to the first plate portion 2121 and the second plate portion 2123; wherein the first plate portion 2121, the third plate portion 2124 and the second plate portion 2123 are integrally formed structures.

[0084] In this embodiment, as Figures 6 to 8 , Figure 10 and Figure 11 As shown, by setting the vibratory plate 212 as a one-piece molded structure, that is, the first plate portion 2121, the third plate portion 2124, and the second plate portion 2123 of the vibratory plate 212 are all one-piece molded structures, both the structural strength of the vibratory plate 212 and the sealing performance can be improved. Optionally, the first plate portion 2121, the third plate portion 2124, and the second plate portion 2123 of the vibratory plate 212 can be integrally stamped.

[0085] Understandably, the third plate portion 2124 extends along the first direction and is located inside the voice coil 22, and is in close contact with the inner peripheral wall of the voice coil 22. This allows the first plate portion 2121 and the second plate portion 2123 of the diaphragm 212 to be connected to the two ends of the third plate portion 2124 along the first direction. This not only achieves the connection and fixation of the first plate portion 2121 and the second plate portion 2123, but also further improves the connection stability and strength between the diaphragm 212 and the voice coil 22 by utilizing the first plate portion 2121 and the third plate portion 2124.

[0086] In this embodiment, the third plate portion 2124 and the second plate portion 2123 of the vibrating plate 212 are optionally arranged perpendicularly, such that the third plate portion 2124 and the second plate portion 2123 surround to form a receiving groove 2125. The first plate portion 2121 extends in a direction away from the receiving groove 2125, and a central magnet corresponds to the receiving groove 2125, that is, the first central magnet 331 corresponds to the receiving groove 2125. Thus, when the voice coil 22 moves along the first direction and approaches the first central magnet 331, the receiving groove 2125 provides a receiving space for the first central magnet 331.

[0087] Understandably, in order to avoid the second plate portion 2123 colliding and interfering with the two central magnets (i.e., the first central magnet 331 and the second central magnet 332) during the vibration of the voice coil 22, the extension length of the third plate portion 2124 along the first direction is optionally less than the extension length of the voice coil 22 along the first direction.

[0088] In one embodiment, the vibration system 2 further includes a waterproof membrane 23, which includes a first connecting portion 231 located at the top of the voice coil 22, a second connecting portion 232 that is in contact with the inner peripheral wall of the voice coil 22, and a third connecting portion 233 located inside the voice coil 22. A first plate portion 2121 is connected to the first connecting portion 231, and a second plate portion 2123 is connected to the third connecting portion 233.

[0089] In this embodiment, as Figures 3 to 5 , Figure 9As shown, by setting the diaphragm 212 as a split structure and simultaneously setting a waterproof membrane 23, and setting the waterproof membrane 23 as a first connecting part 231, a second connecting part 232 and a third connecting part 233, the second connecting part 232 of the waterproof membrane 23 is fitted and connected to the inner peripheral wall of the voice coil 22, and the first connecting part 231 is connected to the first plate part 2121, and the third connecting part 233 is connected to the second plate part 2123. In this way, the connection and fixation of the first plate part 2121 and the second plate part 2123 can be achieved, and the waterproof membrane 23 can be used in conjunction with the diaphragm 212 to further improve the connection stability and strength between the diaphragm 212 and the voice coil 22, thereby improving the waterproof sealing effect.

[0090] Optionally, the first connecting portion 231, the second connecting portion 232, and the third connecting portion 233 of the waterproof membrane 23 are integrally formed. Understandably, this can improve both the structural strength of the waterproof membrane 23 and its waterproof sealing performance.

[0091] In this embodiment, the second connecting portion 232 and the third connecting portion 233 of the waterproof membrane 23 are optionally arranged vertically, such that the second connecting portion 232 and the third connecting portion 233 surround and form a receiving groove 2125. The first connecting portion 231 extends in a direction away from the receiving groove 2125, and a central magnet corresponds to the receiving groove 2125, that is, the first central magnet 331 corresponds to the receiving groove 2125. Thus, when the voice coil 22 moves along the first direction and approaches the first central magnet 331, the receiving groove 2125 provides a receiving space for the first central magnet 331. Optionally, the first connecting portion 231 and the third connecting portion 233 are respectively connected to the two ends of the second connecting portion 232 along the first direction.

[0092] Understandably, in order to avoid the second plate portion 2123 from colliding and interfering with the two central magnets (i.e., the first central magnet 331 and the second central magnet 332) during the vibration of the voice coil 22, optionally, the extension length of the second connecting portion 232 of the waterproof membrane 23 along the first direction is less than the extension length of the voice coil 22 along the first direction.

[0093] In this embodiment, the top of the voice coil 22 can be fixed to the first plate portion 2121 or the first connecting portion 231 of the waterproof membrane 23. That is, the top of the voice coil 22 is connected to the first plate portion 2121, and the first connecting portion 231 is connected to the side of the first plate portion 2121 facing away from the voice coil 22. In other words, the first plate portion 2121 is sandwiched between the top of the voice coil 22 and the first connecting portion 231. Alternatively, the top of the voice coil 22 is connected to the first connecting portion 231, and the first plate portion 2121 is connected to the side of the first connecting portion 231 facing away from the voice coil 22. That is, the first connecting portion 231 is sandwiched between the first plate portion 2121 and the top of the voice coil 22. This is not limited here.

[0094] Understandably, the second plate portion 2123 is connected to the third connecting portion 233 and located on either side of the third connecting portion 233, which can structurally reinforce the waterproof membrane 23. Optionally, the second plate portion 2123 is located on the side of the third connecting portion 233 facing the top of the voice coil 22, that is, the second plate portion 2123 is located on the side of the third connecting portion 233 facing the first central magnet 331.

[0095] It should be noted that the accommodating groove 2125 not only provides accommodating space for the first central magnet 331, but also prevents vibration from propagating along the surface of the diaphragm 211, thereby improving the acoustic performance of the sound-generating device 100.

[0096] In one implementation, such as Figures 3 to 11 As shown, the outer periphery of the first plate portion 2121 is recessed and bent toward the voice coil 22 to form a stepped portion 2122, and the inner periphery of the diaphragm 211 is supported and overlapped with the stepped portion 2122.

[0097] In this embodiment, a step portion 2122 is formed by concave bending of the outer periphery of the first plate portion 2121. This step portion 2122 is used to fix the inner periphery of the diaphragm 211 and to position and limit the inner periphery of the diaphragm 211. Simultaneously, when the inner periphery of the diaphragm 211 is supported and overlapped with the step portion 2122, the inner periphery of the diaphragm 211 can optionally be flush with the first plate portion 2121. This makes the mating structure between the first plate portion 2121 and the diaphragm 211 more compact, reducing the occupied vibration space.

[0098] Understandably, the stepped portion 2122 is formed by the outer periphery of the first plate portion 2121 being bent inward toward the voice coil 22, so that the stepped portion 2122 and the inner periphery of the first plate portion 2121 form a limiting groove, and cooperate with the third plate portion 2124 or the second connecting portion 232 to limit the installation of the top of the voice coil 22, thereby further improving the connection stability of the voice coil 22.

[0099] In one embodiment, along the first direction, the distances between the opposite sides of the second plate portion 2123 and the corresponding central magnets are the same.

[0100] In this embodiment, as Figure 4 , Figure 7As shown, the second plate portion 2123 has a first surface facing the first central magnet 331 and a second surface facing the second central magnet 332. Optionally, the distance from the first surface to the first central magnet 331 is the same as the distance from the second surface to the second central magnet 332. This ensures that when the voice coil 22 drives the second plate portion 2123 to vibrate along the first direction, collision interference between the second plate portion 2123 and the first and second central magnets 331 and 332 can be effectively avoided. Optionally, the projection of the second plate portion 2123 perpendicular to the first direction is located at the center of the voice coil 22.

[0101] In one embodiment, the magnetic circuit system 3 further includes a first magnetic yoke 31 and a second magnetic yoke 32 disposed opposite to each other, and two central magnets including a first central magnet 331 and a second central magnet 332. The side of the first central magnet 331 facing away from the diaphragm assembly 21 is connected to the first magnetic yoke 31, and the side of the second central magnet 332 facing away from the diaphragm assembly 21 is connected to the second magnetic yoke 32.

[0102] In this embodiment, as Figures 1 to 8 , Figure 12 , Figure 13 As shown, by setting the first magnetic yoke 31 and the second magnetic yoke 32 so that the first magnetic yoke 31 and the second magnetic yoke 32 are arranged opposite to each other, the first magnetic yoke 31 and the second magnetic yoke 32 can be used to install and fix the two central magnets respectively, and at the same time, the magnetic lines of force of the two central magnets can be concentrated to form a magnetic circuit.

[0103] Understandably, the side of the first central magnet 331 facing away from the diaphragm assembly 21 is connected to the first magnetic yoke 31, and the side of the second central magnet 332 facing away from the diaphragm assembly 21 is connected to the second magnetic yoke 32. Optionally, the projected area of ​​the first magnetic yoke 31 along the first direction is greater than or equal to the projected area of ​​the first central magnet 331 along the first direction, and the projected area of ​​the second magnetic yoke 32 along the first direction is greater than or equal to the projected area of ​​the second central magnet 332 along the first direction. This not only achieves the installation and fixation of the first central magnet 331 and the second central magnet 332, but also achieves a magnetic focusing effect. In this embodiment, the first magnetic yoke 31 and the second magnetic yoke 32 can be selected as a magnetic guide plate structure.

[0104] In one embodiment, the first magnetic yoke 31 has a first recessed groove corresponding to the first central magnet 331, and the first central magnet 331 is disposed in the first recessed groove. It is understood that this arrangement allows for the positioning and installation of the first central magnet 331 using the first recessed groove, improving installation stability. Furthermore, it reduces the assembly height between the first central magnet 331 and the first magnetic yoke 31, increasing the vibration space of the diaphragm assembly 21.

[0105] In this embodiment, the first recessed groove can be formed by the recess of the first magnetic yoke 31 facing the first central magnet 331, in which case the first magnetic yoke 31 is planar facing away from the first central magnet 331; or, the first recessed groove can be formed by bending the first magnetic yoke 31 toward the side away from the first central magnet 331, in which case the side of the first magnetic yoke 31 facing away from the first central magnet 331 is raised corresponding to the position of the first recessed groove, which is not limited here.

[0106] In one implementation, such as Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the second magnetic yoke 32 has a second recessed groove 321 corresponding to the second central magnet 332, and the second central magnet 332 is disposed within the second recessed groove 321. It can be understood that this arrangement allows for the positioning and installation of the second central magnet 332 using the second recessed groove 321, improving installation stability. Furthermore, it reduces the assembly height between the second central magnet 332 and the second magnetic yoke 32, increasing the vibration space of the diaphragm assembly 21.

[0107] In this embodiment, the second recessed groove 321 may be formed by the second magnetic yoke 32 being recessed on the side facing the second central magnet 332, in which case the second magnetic yoke 32 is planar on the side away from the second central magnet 332; or, the second recessed groove 321 may be formed by bending the second magnetic yoke 32 toward the side away from the second central magnet 332, in which case the side of the second magnetic yoke 32 away from the second central magnet 332 is raised at the position corresponding to the second recessed groove 321, which is not limited here.

[0108] In one embodiment, the magnetic circuit system 3 further includes a side magnetic portion 34 disposed on the second magnetic yoke 32. The side magnetic portion 34 is located outside the second central magnet 332 and is spaced apart from the second central magnet 332 to form a magnetic gap 35.

[0109] In this embodiment, as Figures 3 to 8 As shown, by placing the side magnetic part 34 on the second magnetic yoke 32 and located outside the second central magnet 332, the side magnetic part 34 and the second central magnet 332 are spaced apart to form a magnetic gap 35, which can effectively ensure the magnetic field strength within the magnetic gap 35.

[0110] Understandably, the side magnetic part 34 not only forms a magnetic circuit with the second central magnet 332 through the second magnetic yoke 32, allowing the magnetic lines of force in the magnetic gap 35 to pass through the voice coil 22, but also forms a magnetic circuit with the first central magnet 331 and the first magnetic yoke 31, so that when the voice coil 22 is close to the first central magnet 331, more magnetic lines of force pass through the voice coil 22, thereby increasing the magnetic force on the voice coil 22, effectively increasing the BL value, making the magnetic lines of force distribution more uniform, and the BLx curve flatter, thereby reducing distortion.

[0111] It should be noted that the side magnetic part 34 can be a single integrated structure, for example, the side magnetic part 34 can be arranged in a ring and surround the outside of the second central magnet 332. Of course, the side magnetic part 34 can also be a separate structure, in which case there are multiple side magnetic parts 34, which are spaced apart and surround the outside of the second central magnet 332, and this is not limited here.

[0112] In this embodiment, as Figures 3 to 8 As shown, the side magnetic part 34 includes a side magnet 341 and a side magnetic plate 342 stacked together, and the side magnet 341 is connected to the second magnetic yoke 32. It can be understood that the side magnet 341 and the side magnetic plate 342 are both located outside the second central magnet 332 and are spaced apart from the second central magnet 332 to form a magnetic gap 35.

[0113] Optionally, the side magnet 341 and the side magnetic plate 342 of the side magnetic part 34 have similar structural outlines. That is, when the side magnetic part 34 is an integral ring structure, both the side magnet 341 and the side magnetic plate 342 are integral ring structures. Alternatively, when the side magnetic part 34 is a split structure, both the side magnet 341 and the side magnetic plate 342 are split structures, and they correspond one-to-one. Of course, in other embodiments, the structures of the side magnet 341 and the side magnetic plate 342 of the side magnetic part 34 can also be different. For example, one of the side magnet 341 and the side magnetic plate 342 may be an integral ring, and the other may be a split structure. This is not limited here.

[0114] In one embodiment, the projection of the side magnetic plate 342 along a direction perpendicular to the first direction is located between the top and bottom of the voice coil 22.

[0115] In this embodiment, when the sound-generating device 100 is not working, that is, when the voice coil 22 is not vibrating, the projection of the side magnetic plate 342 along the direction perpendicular to the first direction is located between the top and bottom of the voice coil 22. This ensures that the voice coil 22 can repeatedly approach the first central magnet 331 or the second central magnet 332 during vibration, thereby ensuring that the magnetic force experienced by the voice coil 22 remains unchanged or changes very little when it moves to the side away from the magnetic gap 35, and making the magnetic field lines of the magnetic circuit system 3 more uniformly distributed and the BLx curve flatter, thereby reducing distortion.

[0116] It should be noted that, when the voice coil 22 vibrates at a small amplitude, the projection of the side magnetic plate 342 along the direction perpendicular to the first direction is located between the top and bottom of the voice coil 22. However, when the voice coil 22 vibrates at a small amplitude, the projection of the side magnetic plate 342 along the direction perpendicular to the first direction is located between the top and bottom of the voice coil 22 only when the voice coil 22 is not vibrating; this is not a limitation.

[0117] In one embodiment, the projection of the side magnetic plate 342 along a direction perpendicular to the first direction is located between the surfaces of the first central magnet 331 and the second central magnet 332 facing the diaphragm assembly 21.

[0118] In this embodiment, as Figure 4 and Figure 7 As shown, by placing the side magnetic plate 342 of the side magnetic part 34 along a projection perpendicular to the first direction between the surfaces of the first center magnet 331 and the second center magnet 332 facing the diaphragm assembly 21, it is ensured that the side magnetic part 34 can form a magnetic circuit with the first center magnet 331 and the second center magnet 332 respectively, so that more magnetic lines of force pass through the voice coil 22, thereby increasing the magnetic field strength, effectively improving the BL value, making the magnetic lines of force distribution more uniform, and the BLx curve flatter, thereby reducing distortion.

[0119] Optionally, the thickness of the side magnet 341 along the first direction is greater than the thickness of the second central magnet 332 along the first direction. In this embodiment, by setting the thickness of the side magnet 341 along the first direction to be greater than the thickness of the second central magnet 332 along the first direction, it is ensured that the projection of the side magnetic plate 342 perpendicular to the first direction is positioned between the surfaces of the first central magnet 331 and the second central magnet 332 facing the diaphragm assembly 21. It should also be noted that the side magnet 341 needs to cooperate with the first central magnet 331 and the second central magnet 332 to form corresponding magnetic circuits. The above arrangement also ensures that the side magnet 341 forms magnetic circuits with comparable magnetic field strengths with the first central magnet 331 and the second central magnet 332.

[0120] In another embodiment, the second magnetic yoke 32 includes a bottom and a side portion (not shown) formed by bending and extending from the periphery of the bottom toward the diaphragm assembly 21, and a second central magnet 332 is disposed at the bottom and spaced from the side portion to form a magnetic gap 35.

[0121] In this embodiment, the second magnetic yoke 32 is configured with its bottom and sides arranged at an angle, such that the sides of the second magnetic yoke 32 are located outside the second central magnet 332 and spaced apart from the second central magnet 332 to form a magnetic gap 35. It is understood that the bottom and sides of the second magnetic yoke 32 may be an integrally formed structure. The bottom and sides are arranged perpendicularly, which is not limited here.

[0122] In one implementation, such as Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 12 and Figure 13As shown, the outer periphery of the first magnetic yoke 31 bends and extends toward the second magnetic yoke 32 to form a first welding portion 315, which is welded to the outer periphery of the second magnetic yoke 32. It can be understood that by welding the first welding portion 315 of the first magnetic yoke 31 to the second magnetic yoke 32, the connection stability is improved. Thus, when the sound-generating device 100 is applied to electronic devices, the structural stability of the sound-generating device 100 can be ensured in the event of drops or other phenomena.

[0123] Optionally, the first welding part 315 includes a plurality of first welding parts 315, which are spaced apart on the outer periphery of the first magnetic yoke 31, and the plurality of first welding parts 315 are welded to the outer periphery of the second magnetic yoke 32, which is not limited here.

[0124] In this embodiment, as Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 12 and Figure 13 As shown, the first magnetic yoke 31 includes a top plate portion 311 and a side plate portion 312 arranged at an angle, and a portion of the side plate portion 312 extends toward the second magnetic yoke 32 to form a first welded portion 315. Optionally, the top plate portion 311, the side plate portion 312 and the first welded portion 315 of the first magnetic yoke 31 are integrally formed structures, which is not limited here.

[0125] In one embodiment, the outer periphery of the second magnetic yoke 32 bends and extends toward the first magnetic yoke 31 to form a second welding portion, which is welded to the outer periphery of the first magnetic yoke 31. It is understood that by welding the second welding portion of the second magnetic yoke 32 to the first magnetic yoke 31, the connection stability is improved. Thus, when the sound-generating device 100 is applied to electronic devices, the structural stability of the sound-generating device 100 can be ensured in the event of drops or other phenomena.

[0126] Optionally, the second welding part includes multiple parts, which are spaced apart on the outer periphery of the second magnetic yoke 32. All of the multiple second welding parts are welded to the outer periphery of the first magnetic yoke 31, which is not limited here.

[0127] In this embodiment, the second magnetic yoke 32 includes a top wall and a side wall arranged at an angle, with a portion of the side wall extending toward the first magnetic yoke 31 to form a second welded portion. Optionally, the top wall, side wall, and second welded portion of the second magnetic yoke 32 are integrally formed structures, which is not limited here.

[0128] In one embodiment, the sound-generating device 100 further includes a housing 1, which is connected to a first magnetic yoke 31 and a second magnetic yoke 32 respectively, and is located between the first magnetic yoke 31 and the second magnetic yoke 32. The first magnetic yoke 31 includes at least a top plate portion 311 located on the side of the diaphragm assembly 21 facing away from the second magnetic yoke 32. A first central magnet 331 is disposed on the top plate portion 311. The outer periphery of the diaphragm 211 is connected to the end of the housing 1 away from the second magnetic yoke 32, and the diaphragm 211 is opposite to and spaced from the top plate portion 311.

[0129] In this embodiment, as Figures 1 to 4 , Figure 6 , Figure 7 As shown, by setting up the outer casing 1, the magnetic circuit system 3 and the vibration system 2 are mounted and fixed using the outer casing 1. It can be understood that the outer casing 1 is located between the first magnetic yoke 31 and the second magnetic yoke 32 along the first direction. The first magnetic yoke 31 is connected to the outer casing 1, and the second magnetic yoke 32 can be connected to the outer casing 1 directly or indirectly, which is not limited here.

[0130] Understandably, the first magnetic yoke 31 includes at least a top plate portion 311 located on the side of the diaphragm assembly 21 facing away from the second magnetic yoke 32, thereby using the top plate portion 311 to mount and fix the first central magnet 331, thus connecting the outer periphery of the diaphragm 211 to the end of the housing 1 away from the second magnetic yoke 32, so that the diaphragm 211 and the top plate portion 311 are opposite and spaced apart, thus ensuring the vibration of the diaphragm 211.

[0131] In this embodiment, the first magnetic yoke 31 can be a flat plate structure, in which case the first magnetic yoke 31 is formed as a top plate portion 311, and the first magnetic yoke 31 and the outer shell 1 can be an integrally molded structure. Optionally, the outer shell 1 is a plastic shell, and the outer shell 1 and the first magnetic yoke 31 are integrally injection molded. Of course, in other embodiments, the first magnetic yoke 31 and the outer shell 1 can also be connected by welding or bonding, which is not limited here.

[0132] Understandably, the outer casing 1 can be a frame structure or frame with openings at both ends. In this case, the first magnetic yoke 31 is connected to one end of the outer casing 1, and the second magnetic yoke 32 is located at the end of the outer casing 1 away from the first magnetic yoke 31. Of course, in other embodiments, the outer casing 1 includes a straight portion and a vertical portion arranged at an angle. The straight portion has a mounting opening, the first magnetic yoke 31 is located at the mounting opening, and the second magnetic yoke 32 is located on the side of the vertical portion of the outer casing 1 facing away from the straight portion. This is not limited here.

[0133] In one embodiment, the first magnetic yoke 31 further includes a side plate portion 312 disposed at an angle to the top plate portion 311. The side plate portion 312 is bent toward the side of the diaphragm assembly 21 to form a support platform 313. The outer periphery of the diaphragm 211 is sandwiched between the housing 1 and the support platform 313.

[0134] In this embodiment, as Figure 1, Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 12 and Figure 13 As shown, by setting the first magnetic yoke 31 as a top plate portion 311 and a side plate portion 312 arranged at an angle, and setting a support platform 313 on the side plate portion 312, the support platform 313 can be used to position and install the outer shell 1, fix the outer periphery of the diaphragm 211 using the outer shell 1 and the support platform 313, and position the outer periphery of the diaphragm 211 away from the top plate portion 311, thus ensuring the vibration of the diaphragm 211.

[0135] It is understood that the side plate portion 312 of the first magnetic yoke 31 and the outer shell 1 can be integrally formed. For example, the outer shell 1 is a plastic shell, and the outer shell 1 and the first magnetic yoke 31 are integrally injection molded. Of course, in other embodiments, the side plate portion 312 of the first magnetic yoke 31 and the outer shell 1 can be connected by welding or bonding, which is not limited here.

[0136] Of course, in other embodiments, the outer periphery of the diaphragm 211 can also be fixed to the inner wall of the housing 1. For example, the inner wall of the housing 1 is provided with a support platform or other structure, and the outer periphery of the diaphragm 211 is fixed to the support platform or other structure. This is not limited here.

[0137] In one embodiment, the magnetic circuit system 3 further includes a side magnetic part 34 disposed on the second magnetic yoke 32. The side magnetic part 34 is located outside the second central magnet 332 and is spaced apart from the second central magnet 332 to form a magnetic gap 35. The side magnetic part 34 includes a side magnet 341 and a side magnetic guide plate 342 stacked together. The side magnet 341 is connected to the second magnetic yoke 32, and the side magnetic guide plate 342 is connected to the outer shell 1. The side magnetic guide plate 342 and the outer shell 1 are integrally formed.

[0138] In this embodiment, as Figures 3 to 8 As shown, the side magnetic part 34 of the magnetic circuit system 3 is disposed on the second magnetic yoke 32, and the second magnetic yoke 32 can be connected to the outer shell 1 through the side magnetic part 34. Optionally, the side magnetic plate 342 of the side magnetic part 34 and the outer shell 1 can be an integrally molded structure. For example, the outer shell 1 is a plastic shell, and the outer shell 1 and the side magnetic plate 342 are integrally injection molded; or, the outer shell 1 is a metal shell, in which case the outer shell 1 and the side magnetic plate 342 are integrally stretched. This is not limited here. Of course, in other embodiments, the outer shell 1 and the side magnetic plate 342 can also be connected by welding or bonding. This is not limited here.

[0139] It should be noted that the outer shell 1 is used to fix the diaphragm 211 of the magnetic circuit system 3 and the vibration system 2, and can also be used to support the first magnetic yoke 31 and the second magnetic yoke 32 of the magnetic circuit system 3, so that the first magnetic yoke 31 and the second magnetic yoke 32 are arranged opposite to each other and spaced apart.

[0140] In one embodiment, a first cavity 11 is formed between the first magnetic yoke 31 and the diaphragm assembly 21, the first central magnet 331 is located inside the first cavity 11, and the sound-generating device 100 is also provided with a sound outlet 314 communicating with the first cavity 11.

[0141] In this embodiment, as Figure 4 and Figure 7 As shown, a first cavity 11 is formed between the first magnetic yoke 31 and the diaphragm assembly 21. The first cavity 11 provides a vibration space for the diaphragm 211 and a mounting space for the first central magnet 331. Understandably, in order to enable the diaphragm 211 to produce sound smoothly during vibration, the sound-producing device 100 is also provided with a sound outlet 314 communicating with the first cavity 11.

[0142] It is understandable that the sound outlet 314 is located on the outer shell 1; or, the sound outlet 314 is located on the first magnetic yoke 31; or, the sound outlet 314 is located at the connection between the outer shell 1 and the first magnetic yoke 31, without any limitation here.

[0143] In one embodiment, the first magnetic yoke 31 includes a top plate portion 311 and a side plate portion 312 arranged at an angle. Optionally, a sound outlet 314 is provided on the top plate portion 311 and opposite to the diaphragm 211; or, the sound outlet 314 is provided on the side plate portion 312.

[0144] Understandably, when the sound outlet 314 of the sound-generating device 100 is located on the top plate portion 311 and faces the diaphragm 211, and the sound-generating device 100 is applied to an electronic device or sound-generating module, the housing of the electronic device or sound-generating module is provided with a sound outlet directly opposite the sound outlet 314, thus making the electronic device or sound-generating module have a front-emitting sound structure. Alternatively, the sound outlet on the housing of the electronic device or sound-generating module is located on one side of the sound-generating device 100, so that the sound outlet is connected to the sound outlet 314 through a sound outlet channel, thereby making the electronic device or sound-generating module have a side-emitting sound structure.

[0145] Of course, in other embodiments, when the sound outlet 314 of the sound-generating device 100 is located on the side plate portion 312, when the sound-generating device 100 is applied to an electronic device or a sound-generating module, and the sound outlet on the housing of the electronic device or the sound-generating module is directly opposite the diaphragm 211 of the sound-generating device 100, the sound outlet is connected to the sound outlet 314 through the sound outlet channel, thus making the electronic device or the sound-generating module have a front-emitting sound structure. Alternatively, the sound outlet on the housing of the electronic device or the sound-generating module is located on one side of the sound-generating device 100, and the sound outlet is correspondingly connected to the sound outlet 314, thereby making the electronic device or the sound-generating module have a side-emitting sound structure.

[0146] In one embodiment, the two central magnets include a first central magnet 331 and a second central magnet 332, with the first central magnet 331 located near the top of the voice coil 22 and the second central magnet 332 located near the bottom of the voice coil 22; wherein the magnetic energy product of the first central magnet 331 is greater than the magnetic energy product of the second central magnet 332. It is understood that this arrangement ensures that the magnetic field strength of the first central magnet 331 is greater than the magnetic field strength of the second central magnet 332.

[0147] In this embodiment, the side magnet 34 is located outside the second center magnet 332, so that the magnetic field strength in the magnetic gap 34 formed by the side magnet 34 and the second center magnet 332 is greater than the magnetic field strength of the first center magnet 331. By setting the magnetic energy product of the first center magnet 331 to be greater than the magnetic energy product of the second center magnet 332, the magnetic field strength at both ends of the voice coil 22 can be balanced, which can further improve the flatness of the BLx curve and reduce distortion.

[0148] Optionally, the volume of the first central magnet 331 is larger than the volume of the second central magnet 332. When the first central magnet 331 and the second central magnet 332 have the same grade, this ensures that the magnetic field strength of the first central magnet 331 is greater than that of the second central magnet 332. In this embodiment, as... Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the outer contours of the first central magnet 331 and the second central magnet 332 are the same, and the thickness of the first central magnet 331 along the first direction is greater than the thickness of the second central magnet 332 along the first direction. This results in the magnetic field strength of the first central magnet 331 being greater than that of the second central magnet 332.

[0149] like Figures 14 to 17 As shown, this utility model also proposes a sound-generating module 500, which includes the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is as described in the foregoing embodiments. Since this electronic device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0150] In one embodiment, the sound-generating module 500 further includes a module housing 400, which has a receiving cavity, and the sound-generating device 100 is disposed in the receiving cavity, dividing the receiving cavity into a front cavity and a rear cavity 420; wherein, the module housing 400 has a sound outlet 410 communicating with the front cavity.

[0151] In this embodiment, the module housing 400 can be a metal housing or a plastic housing, and is not limited thereto. The module housing 400 can be a one-piece structure or a split structure, and is not limited thereto. The module housing 400 includes an upper module housing and a lower module housing, which are mated together and enclosed to form a receiving cavity. Optionally, the upper module housing and the lower module housing can be bonded together or welded together.

[0152] Optionally, the outer contour of the module housing 400 can be a square structure. In specific applications, other suitable shapes such as circles can be selected according to the actual situation, and it is not limited to a specific shape.

[0153] In this embodiment, the sound-generating device 100 is disposed within the receiving cavity, which is divided into a front cavity and a rear cavity 420. The upper shell of the module corresponds to the front cavity, and the lower shell of the module corresponds to the rear cavity 420. It is understood that the sound outlet 410 is located on the upper shell of the module or at the connection between the upper and lower shells.

[0154] In one embodiment, the module housing 400 is further provided with a vent hole communicating with the rear cavity 420 for adjusting the pressure within the rear cavity 420. It is understood that the vent hole is located in the lower housing of the module. Optionally, the vent hole can be a circular hole, an elliptical hole, or a polygonal hole, etc., and is not limited here. The number of vent holes can be one or more, depending on the actual application design, and is not limited here.

[0155] Understandably, the upper shell of the module includes a top wall and a first side wall, and the lower shell of the module includes a bottom wall and a second side wall. The first and second side walls together form the side walls of the module housing 400 of the sound-emitting module 500. That is, the module housing 400 includes a top wall and a bottom wall disposed opposite each other, and a side wall connecting the top wall and the bottom wall. Optionally, the sound outlet 410 is located in the connection area between the top wall and the side wall, and the sound leakage hole is located in the connection area between the side wall and the bottom wall. In this way, the sound-emitting performance of the sound-emitting module 500 and the technical effect of protecting privacy can be taken into account. The most suitable design scheme can be selected according to actual needs during use, and this utility model does not limit it.

[0156] In this embodiment, as Figures 14 to 17 As shown, the top wall of the upper shell of the module has a first opening, and the bottom wall of the lower shell of the module has a second opening. When the sound-generating device 100 is installed in the module housing 400, the first magnetic yoke 31 of the sound-generating device 100 corresponds to or is located at the first opening, and the second magnetic yoke 32 of the sound-generating device 100 corresponds to or is located at the second opening. It can be understood that the first opening can be a sound outlet 410; or, the first opening is only used to install the sound-generating device 100 to reduce the thickness of the sound-generating module 500 in the Z direction, which is not limited here.

[0157] In one implementation, such as Figure 16 and Figure 17 As shown, the sound outlet 410 is directly opposite the diaphragm assembly 21 of the sound-generating device 100, so that the sound-generating module 500 has a positive sound output structure. It can be understood that when the sound outlet 410 of the sound-generating module 500 is directly opposite the diaphragm assembly 21 of the sound-generating device 100, the sound-generating module 500 has a positive sound output structure.

[0158] Optionally, the sound outlet 410 is directly connected to the sound outlet 314 of the sound generating device 100; or, the sound outlet 410 is connected to the sound outlet 314 of the sound generating device 100 through a sound outlet channel, which is not limited here.

[0159] In one implementation, such as Figure 14 and Figure 15 As shown, the sound outlet 410 is located on one side of the sound-generating device 100, so that the sound-generating module 500 has a side-emitting structure. It can be understood that the sound outlet 410 of the sound-generating module 500 is located on one side of the sound-generating device 100, that is, the sound outlet 410 is not directly opposite the diaphragm assembly 21 of the sound-generating device 100, but is located on one side of the periphery of the diaphragm assembly 21. At this time, the sound-generating module 500 has a side-emitting structure.

[0160] Optionally, the sound outlet 410 is directly connected to the sound outlet 314 of the sound generating device 100; or, the sound outlet 410 is connected to the sound outlet 314 of the sound generating device 100 through a sound outlet channel, which is not limited here.

[0161] This utility model also proposes an electronic device, which includes the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is as described in the foregoing embodiments. Since this electronic device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0162] This utility model also proposes an electronic device, which includes the aforementioned sound-generating module 500. The specific structure of the sound-generating module 500 is as described in the foregoing embodiments. Since this electronic device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be repeated here.

[0163] Optionally, the aforementioned electronic device may be a mobile phone, earphones, computer, PAD, smart wearable device, etc., and this utility model does not impose specific limitations on it.

[0164] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: A vibration system vibrates along a first direction. The vibration system includes a diaphragm assembly and a voice coil. The diaphragm assembly includes a diaphragm and a diaphragm plate. The inner periphery of the diaphragm is connected to the diaphragm plate. The diaphragm plate includes a first plate portion and a second plate portion located on different horizontal planes. The top of the voice coil is connected to the first plate portion. The second plate portion is located inside the voice coil, and the outer periphery of the second plate portion abuts against the inner peripheral wall of the voice coil. A magnetic circuit system is provided with a magnetic gap. The end of the voice coil away from the first plate is suspended in the magnetic gap. The magnetic circuit system includes a central magnetic part, which includes two central magnets that are arranged opposite to each other and spaced apart along the first direction. The two central magnets are located on opposite sides of the second plate. The projections of the two central magnets along the first direction are located inside the voice coil, and the sides of the two central magnets facing the diaphragm assembly are exposed in the internal cavity of the sound-generating device. Both central magnets are magnetized along the first direction but in opposite directions.

2. The sound-generating device as described in claim 1, characterized in that, The vibrating plate also includes a third plate portion, which is located inside the voice coil and is fitted and connected to the inner peripheral wall of the voice coil. The two ends of the third plate portion along the first direction are respectively connected to the first plate portion and the second plate portion. The first plate, the third plate, and the second plate are integrally formed structures.

3. The sound-generating device as described in claim 1, characterized in that, The vibration system further includes a waterproof membrane, which includes a first connecting portion located at the top of the voice coil, a second connecting portion that is fitted and connected to the inner peripheral wall of the voice coil, and a third connecting portion located inside the voice coil. The first plate portion is connected to the first connecting portion, and the second plate portion is connected to the third connecting portion.

4. The sound-generating device as described in claim 3, characterized in that, The first connecting portion is sandwiched between the first plate portion and the top of the voice coil; And / or, the second plate portion is located on the side of the third connecting portion facing the top of the voice coil; And / or, the first connecting part, the second connecting part and the third connecting part are integrally formed structures; And / or, the extension length of the second connecting portion along the first direction is less than the extension length of the voice coil along the first direction; And / or, the first connecting portion and the third connecting portion are respectively connected to the two ends of the second connecting portion along the first direction.

5. The sound-generating device as described in claim 1, characterized in that, The outer periphery of the first plate is recessed and bent toward the voice coil to form a stepped portion, and the inner periphery of the diaphragm is supported and overlapped with the stepped portion; And / or, along the first direction, the distances between the opposite sides of the second plate and the corresponding central magnets are the same.

6. The sound-generating device as claimed in claim 1, characterized in that, The magnetic circuit system further includes a first magnetic yoke and a second magnetic yoke arranged opposite to each other. The two central magnets include a first central magnet and a second central magnet. The side of the first central magnet facing away from the diaphragm assembly is connected to the first magnetic yoke, and the side of the second central magnet facing away from the diaphragm assembly is connected to the second magnetic yoke.

7. The sound-generating device as described in claim 6, characterized in that, The magnetic circuit system further includes a side magnetic portion disposed on the second magnetic yoke, the side magnetic portion being located outside the second central magnet and spaced apart from the second central magnet to form the magnetic gap.

8. The sound-generating device as claimed in claim 7, characterized in that, The side magnetic part includes a side magnet and a side magnetic plate stacked together, and the side magnet is connected to the second magnetic yoke; Wherein, the projection of the side magnetic plate along the direction perpendicular to the first direction is located between the top and bottom of the voice coil; and / or, the projection of the side magnetic plate along the direction perpendicular to the first direction is located between the surfaces of the first center magnet and the second center magnet facing the diaphragm assembly; and / or, the thickness of the side magnet along the first direction is greater than the thickness of the second center magnet along the first direction.

9. The sound-generating device as described in claim 6, characterized in that, The second magnetic yoke includes a bottom and a side portion formed by bending and extending the periphery of the bottom toward the diaphragm assembly, wherein the second central magnet is disposed on the bottom and spaced from the side portion to form the magnetic gap.

10. The sound-generating device as claimed in claim 6, characterized in that, The outer periphery of the first magnetic yoke bends and extends toward the second magnetic yoke to form a first welded portion, and the first welded portion is welded to the outer periphery of the second magnetic yoke; And / or, the outer periphery of the second magnetic yoke bends and extends toward the first magnetic yoke to form a second welded portion, and the second welded portion is welded to the outer periphery of the first magnetic yoke.

11. The sound-generating device as claimed in claim 6, characterized in that, The sound-generating device further includes a housing, which is connected to the first magnetic yoke and the second magnetic yoke respectively and is located between the first magnetic yoke and the second magnetic yoke. The first magnetic yoke includes at least a top plate portion located on the side of the diaphragm assembly facing away from the second magnetic yoke. The first central magnet is disposed on the top plate portion. The outer periphery of the diaphragm is connected to the end of the housing away from the second magnetic yoke, and the diaphragm is opposite to and spaced from the top plate portion.

12. The sound-generating device as claimed in claim 11, characterized in that, The first magnetic yoke also includes a side plate portion disposed at an angle to the top plate portion, the side plate portion being bent toward the side of the diaphragm assembly to form a support platform, and the outer periphery of the diaphragm being sandwiched between the outer shell and the support platform; And / or, the outer shell is a plastic shell, and the outer shell and the first magnetic yoke are integrally injection molded.

13. The sound-generating device as claimed in claim 11, characterized in that, The magnetic circuit system further includes a side magnetic part disposed on the second magnetic yoke. The side magnetic part is located outside the second central magnet and is spaced apart from the second central magnet to form the magnetic gap. The side magnetic part includes a side magnet and a side magnetic guide plate stacked together. The side magnet is connected to the second magnetic yoke, and the side magnetic guide plate is connected to the outer shell. The side magnetic plate and the outer shell are integrally formed.

14. The sound-generating device as claimed in claim 11, characterized in that, A first cavity is formed between the first magnetic yoke and the diaphragm assembly, the first central magnet is located in the first cavity, and the sound-generating device is also provided with a sound outlet hole communicating with the first cavity; The sound outlet is located in the outer casing; Alternatively, the first magnetic yoke includes a top plate portion and a side plate portion arranged at an angle, with the sound outlet located on the top plate portion and opposite to the diaphragm; or, the sound outlet is located on the side plate portion. Alternatively, the sound outlet may be located at the connection between the outer casing and the first magnetic yoke.

15. The sound-generating device as described in any one of claims 1 to 14, characterized in that, The two center magnets include a first center magnet and a second center magnet, the first center magnet being located near the top of the voice coil and the second center magnet being located near the bottom of the voice coil; Wherein, the magnetic energy product of the first central magnet is greater than the magnetic energy product of the second central magnet; or, the volume of the first central magnet is greater than the volume of the second central magnet; or, the outer contours of the first central magnet and the second central magnet are the same, and the thickness of the first central magnet along the first direction is greater than the thickness of the second central magnet along the first direction.

16. A sound-generating module, characterized in that, The sound-generating module includes: Module housing, the module housing having a receiving cavity; and The sound-generating device as described in any one of claims 1 to 15 is disposed within the receiving cavity and divides the receiving cavity into a front cavity and a rear cavity; The module housing is provided with a sound outlet that communicates with the front cavity.

17. The sound-generating module as described in claim 16, characterized in that, The sound outlet is positioned directly opposite the diaphragm assembly of the sound-generating device, so that the sound-generating module has a front-emitting structure; or, the sound outlet is located on one side of the sound-generating device, so that the sound-generating module has a side-emitting structure. And / or, the module housing is also provided with a sound vent hole that communicates with the rear cavity.

18. An electronic device, characterized in that, The electronic device includes the sound-generating module as described in claim 16 or 17; Alternatively, the electronic device may include a sound-generating device as described in any one of claims 1 to 15.

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