Sound production device, sound production module and electronic equipment

Abstract

The invention discloses a sound production device, a sound production module and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibration plate of a vibration system of the sound production 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; a center magnetic part of the magnetic circuit system comprises a first center magnet and a second center magnet which are located on the two opposite sides of the second plate part, the first center magnet is close to the top of the voice coil, and the second center magnet is close to the bottom of the voice coil. The first center magnet and the second center magnet are magnetized in the first direction and are opposite in magnetizing direction, and the magnetic energy product of the first center magnet is larger than that of the second center magnet. According to the sound production device, the thinning design can be realized, the BL value is effectively improved, the magnetic lines are distributed more uniformly, the BLx curve is flatter, and thus the distortion is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducers, and particularly to a sound generating device, a sound generating module and an electronic device applying the sound generating device. Background Art

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

[0003] In related technologies, a speaker forms a magnetic field through a central magnetic part and a side magnetic part. The voice coil is located in the magnetic field. When an alternating current is applied to the voice coil, the voice coil makes a reciprocating motion in the magnetic field, thereby driving the diaphragm to move, and then pushing the air to generate sound. The magnetic field formed by the central magnetic part and the side magnetic part is stronger in the regions close to the central magnetic part and the side magnetic part and weaker in the regions far from the central magnetic part and the side magnetic part. During the reciprocating motion of the voice coil, when the voice coil moves to a position far from the central magnetic part and the side magnetic part, the magnetic field is weak, resulting in insufficient magnetic force, which affects the sound performance of the speaker. At the same time, the central magnetic part of the speaker is usually designed with a structure of a central magnet + a central washer. Most of the magnetic lines of force are concentrated near the central washer. Under large displacements, the BLx curve decays greatly and the flatness is poor, resulting in problems such as low performance and high distortion of the speaker. In addition, the structural design with large displacements is more unable to meet the requirements of thinness and miniaturization of the speaker. Summary of the Invention

[0004] The main object of the present invention is to provide a sound generating device, a sound generating module and an electronic device, aiming to solve the problem that during the reciprocating motion of the voice coil, when the voice coil is far from the central magnetic part and the side magnetic part, the magnetic force is insufficient, which affects the sound performance. The sound generating device can not only achieve a thinner design, but also effectively increase the volume of the magnet, improve the BL value of the product, make the distribution of magnetic lines of force more uniform, and make the BLx curve flatter, thereby reducing distortion.

[0005] To achieve the above object, the present invention provides a sound generating device, which includes:

[0006] A vibration system, the 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 vibration plate, the inner peripheral edge of the diaphragm is connected to the vibration plate, the vibration plate includes a first plate part and a second plate part located on different horizontal planes, the voice coil is an annular voice coil and extends along the first direction, the top of the voice coil is connected to the first plate part, the second plate part is located inside the voice coil, and the outer periphery of the second plate part abuts against the inner peripheral wall of the voice coil; and

[0007] A magnetic circuit system, the magnetic circuit system includes a central magnetic part and side magnetic parts arranged outside the central magnetic part, the side magnetic parts are spaced from the central magnetic part to form a magnetic gap, one end of the voice coil away from the first plate part is suspended in the magnetic gap, the central magnetic part includes a first central magnet and a second central magnet arranged opposite and spaced along the first direction, the first central magnet and the second central magnet are located on opposite sides of the second plate part, and the projection along the first direction is located inside the voice coil, and the sides of the first central magnet and the second central magnet facing the diaphragm assembly are both exposed in the internal cavity of the sound generating device;

[0008] Wherein, the first central magnet is close to the top of the voice coil, the second central magnet is close to the bottom of the voice coil, the first central magnet and the second central magnet are both magnetized along the first direction and the magnetization directions are opposite, and the magnetic energy product of the first central magnet is greater than that of the second central magnet.

[0009] In one embodiment, the vibrating plate further includes a third plate part, the third plate part is located inside the voice coil and is attached to the inner peripheral wall of the voice coil, and both ends of the third plate part along the first direction are respectively connected to the first plate part and the second plate part;

[0010] Wherein, the first plate part, the third plate part and the second plate part are of an integrally formed structure.

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

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

[0013] And / or, the second plate part is arranged on the side of the third connecting part facing the first central magnet;

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

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

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

[0017] In one embodiment, the outer periphery of the first plate portion is recessed and bent towards the voice coil to form a stepped portion, and the inner peripheral edge of the diaphragm is supported and lapped on the stepped portion;

[0018] And / or, the distance from the side of the second plate portion facing the first central magnet to the first central magnet is the same as the distance from the side of the second plate portion facing the second central magnet to the second central magnet.

[0019] In one embodiment, the magnetic circuit system further includes a first yoke and a second yoke which are oppositely arranged. The side of the first central magnet facing away from the diaphragm assembly is connected to the first yoke, and the side of the second central magnet facing away from the diaphragm assembly and the edge magnetic portion are both connected to the second yoke.

[0020] In one embodiment, the outer periphery of the first yoke is bent and extended towards the second yoke to form a first welding portion, and the first welding portion is welded to the outer periphery of the second yoke;

[0021] And / or, the outer periphery of the second yoke is bent and extended towards the first yoke to form a second welding portion, and the second welding portion is welded to the outer periphery of the first yoke.

[0022] In one embodiment, the sound generating device further includes a housing which is respectively connected to the first yoke and the second yoke and is located between the first yoke and the second yoke. The first yoke at least includes a top plate portion on the side of the diaphragm assembly facing away from the second yoke. The first central magnet is arranged on the top plate portion. The outer peripheral edge of the diaphragm is connected to one end of the housing away from the second yoke, and the diaphragm is opposite to and spaced from the top plate portion.

[0023] In one embodiment, the first yoke further includes a side plate portion arranged at an angle with the top plate portion. The side plate portion is bent towards the diaphragm assembly to form a support platform, and the outer peripheral edge of the diaphragm is clamped between the housing and the support platform;

[0024] And / or, the housing is a plastic housing, and the housing and the first yoke are integrally injection molded.

[0025] In one embodiment, the edge magnetic portion includes a stacked edge magnet and an edge magnetic conductive plate. The edge magnet is connected to the second yoke, and the edge magnetic conductive plate is connected to the housing;

[0026] Wherein, the edge magnetic conductive plate and the housing are an integrally formed structure.

[0027] In one embodiment, a first cavity is formed between the first magnetic yoke and the diaphragm assembly. The first central magnet is located within the first cavity. The sound generating device further has a sound outlet hole communicating with the first cavity.

[0028] Wherein, the sound outlet hole is provided on the housing.

[0029] Or, the first magnetic yoke includes a top plate portion and a side plate portion arranged at an angle. Wherein, the sound outlet hole is provided on the top plate portion and faces the diaphragm; or, the sound outlet hole is provided on the side plate portion.

[0030] Or, the sound outlet hole is provided at the connection between the housing and the first magnetic yoke.

[0031] In one embodiment, the edge magnetic portion includes a stacked edge magnet and an edge magnetic conductive plate. The edge magnet is located outside the second central magnet and is spaced from the second central magnet to form the magnetic gap. Wherein, the projection of the edge magnetic conductive plate in a direction perpendicular to the first direction is located between the top and the bottom of the voice coil; and / or, the projection of the edge magnetic conductive plate in a direction perpendicular to the first direction is located between the surfaces of the first central magnet and the second central magnet facing the diaphragm assembly; and / or, the thickness of the edge magnet in the first direction is greater than the thickness of the second central magnet in the first direction.

[0032] And / 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 in the first direction is greater than the thickness of the second central magnet in the first direction.

[0033] The present invention further provides a sound generating module, which includes:

[0034] A module housing provided with a receiving cavity; and

[0035] The above-mentioned sound generating device, which is arranged in the receiving cavity and divides the receiving cavity into a front cavity and a rear cavity;

[0036] Wherein, the module housing is provided with a sound outlet communicating with the front cavity.

[0037] In one embodiment, the sound outlet is arranged directly opposite to the diaphragm assembly of the sound generating device, so that the sound generating module has a front sound output structure; or, the sound outlet is located on one side of the sound generating device, so that the sound generating module has a side sound output structure.

[0038] And / or, the module housing is further provided with a sound leakage hole communicating with the rear cavity.

[0039] The present invention also provides an electronic device, which includes the above-mentioned sound generating module;

[0040] Alternatively, the electronic device includes the above-mentioned sound generating device.

[0041] In the sound generating device of the technical solution of the present invention, the magnetic circuit system is set as a central magnetic part and an edge magnetic part arranged outside the central magnetic part, so that the edge magnetic part is spaced from the central magnetic part to form a magnetic gap, and the vibration system is set as a diaphragm assembly and a voice coil, so that one end of the voice coil is suspended in the magnetic gap. Thus, when a current is passed into the voice coil, the voice coil reciprocates in the magnetic field formed by the magnetic circuit system, drives the diaphragm assembly to move in the first direction, and then pushes the air to generate sound. At the same time, the central magnetic part is set as a first central magnet and a second central magnet that are opposite and spaced in the first direction, so that the first central magnet is close to the top of the voice coil, the second central magnet is close to the bottom of the voice coil, the inner periphery of the diaphragm of the diaphragm assembly is connected to the vibration plate, and the vibration plate is set as a first plate part and a second plate part located at different horizontal planes in the first direction, so that the top of the voice coil is connected to the first plate part, the second plate part is located inside the voice coil, and the outer periphery of the second plate part abuts against the inner peripheral wall of the voice coil. Thus, the first central magnet and the second central magnet are located on opposite sides of the second plate part, and the projections of the first central magnet and the second central magnet in the first direction are located inside the voice coil. The sides of the first central magnet and the second central magnet facing the diaphragm assembly are both exposed in the internal cavity of the sound generating device. The first central magnet and the second central magnet are both magnetized in the first direction and the magnetization directions are opposite, and the magnetic energy product of the first central magnet is greater than that of the second central magnet. Therefore, the cooperation of the first central magnet and the second central magnet with the edge magnetic part is used to enhance the magnetic field strength in the area where the voice coil is located, thereby enhancing the magnetic force received by the voice coil. Even when the voice coil moves to the side far from the magnetic gap, under the action of the first central magnet and the second central magnet, the magnetic force received by the voice coil will be enhanced, thereby increasing the volume, improving the sound quality, and improving the acoustic performance of the sound generating device. And, by using the first plate part and the second plate part of the vibration plate located at different horizontal planes in the first direction, and the projections of the first central magnet and the second central magnet in the first direction are located inside the voice coil, during the movement of the diaphragm assembly, the cooperation of the voice coil and the second plate part is respectively used to provide accommodation spaces for the first central magnet and the second central magnet, so that the first central magnet and the second central magnet can be closer to the voice coil, achieving a magnetic field enhancement effect. Thus, it can effectively solve the problem that during the reciprocating movement of the voice coil, the magnetic force is insufficient when the voice coil is far from the magnetic gap, which affects the acoustic performance. The first central magnet and the second central magnet cancel the structure of the conventional central washer. Not only can a thinner design be realized, making the magnetic flux line distribution more uniform and the BLx curve flatter, thereby reducing distortion. Moreover, under the condition of the same volume requirement, since the structure of the central washer is not provided, the volumes of the first central magnet and the second central magnet can be made larger, thereby improving the BL value of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0043] Figure 1 Schematic structural diagram of an embodiment of the sound generating device provided by the present invention;

[0044] Figure 2 Top view structural diagram of an embodiment of the sound generating device provided by the present invention;

[0045] Figure 3 Exploded view of an embodiment of the sound generating device provided by the present invention;

[0046] Figure 4 Cross-sectional view of an embodiment of the sound generating device provided by the present invention;

[0047] Figure 5 For Figure 4 Enlarged view of part A in

[0048] Figure 6 Exploded view of another embodiment of the sound generating device provided by the present invention;

[0049] Figure 7 Cross-sectional view of another embodiment of the sound generating device provided by the present invention;

[0050] Figure 8 For Figure 7 Enlarged view of part B in

[0051] Figure 9 Exploded view of the diaphragm and the waterproof film in an embodiment of the sound generating device provided by the present invention;

[0052] Figure 10 Schematic structural diagram of the diaphragm in an embodiment of the sound generating device provided by the present invention;

[0053] Figure 11 Cross-sectional view of the diaphragm in an embodiment of the sound generating device provided by the present invention;

[0054] Figure 12 Schematic structural diagram of the first yoke in an embodiment of the sound generating device provided by the present invention;

[0055] Figure 13Schematic diagram of the structure of the first yoke in another embodiment of the sound generating device provided by the present invention;

[0056] Figure 14 Schematic diagram of the structure of an embodiment of the sound generating module provided by the present invention;

[0057] Figure 15 Schematic cross-sectional view of an embodiment of the sound generating module provided by the present invention;

[0058] Figure 16 Schematic diagram of the structure of another embodiment of the sound generating module provided by the present invention;

[0059] Figure 17 Schematic cross-sectional view of another embodiment of the sound generating module provided by the present invention;

[0060] Figure 18 Schematic diagram of the simulation effect of an embodiment of the sound generating device provided by the present invention.

[0061] Explanation of the reference numerals in the drawings:

[0062] 100, sound generating device; 1, housing; 11, first cavity; 2, vibration system; 21, diaphragm assembly; 211, diaphragm; 212, vibration plate; 2121, first plate portion; 2122, stepped portion; 2123, second plate portion; 2124, third plate portion; 2125, accommodation groove; 22, voice coil; 23, waterproof film; 231, first connection portion; 232, second connection portion; 233, third connection portion; 3, magnetic circuit system; 31, first yoke; 311, top plate portion; 312, side plate portion; 313, support platform; 314, sound outlet; 315, first welding portion; 32, second yoke; 321, second recessed groove; 33, central magnetic portion; 331, first central magnet; 332, second central magnet; 34, side magnetic portion; 341, side magnet; 342, side magnetic conduction plate; 35, magnetic gap; 400, module housing; 410, sound outlet; 420, rear cavity; 500, sound generating module.

[0063] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0064] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0065] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0066] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or a scenario where both A and B are satisfied simultaneously.

[0067] In addition, the descriptions such as "first", "second", etc. in the present invention are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0068] The present invention provides a sound generating device 100. It can be understood that the sound generating device 100 is applied to an electronic device, and the electronic device can be a mobile phone, earphone, smart wearable device, etc., which is not limited herein.

[0069] Please refer to Figures 1 to 13As shown, in the 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 vibration plate 212. The inner peripheral edge of the diaphragm 211 is connected to the vibration plate 212. The vibration plate 212 includes a first plate portion 2121 and a second plate portion 2123 located on different horizontal planes. The voice coil 22 is an annular voice coil and extends along the first direction. 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. The magnetic circuit system 3 includes a central magnetic portion 33 and a side magnetic portion 34 provided outside the central magnetic portion 33. The side magnetic portion 34 and the central magnetic portion 33 are spaced apart to form a magnetic gap 35. One end of the voice coil 22 away from the first plate portion 2121 is suspended in the magnetic gap 35. The central magnetic portion 33 includes a first central magnet 331 and a second central magnet 332 that are opposite and spaced apart along the first direction. The first central magnet 331 and the second central magnet 332 are located on opposite sides of the second plate portion 2123, and their projections along the first direction are located inside the voice coil 22. The sides of the first central magnet 331 and the second central magnet 332 facing the diaphragm assembly 21 are both exposed in the internal cavity of the sound generating device 100. Among them, the first central magnet 331 is close to the top of the voice coil 22, the second central magnet 332 is close to the bottom of the voice coil 22. The first central magnet 331 and the second central magnet 332 are both magnetized along the first direction and the magnetization directions are opposite. The magnetic energy product of the first central magnet 331 is greater than that of the second central magnet 332.

[0070] In this embodiment, the sound generating device 100 can be the sound generating unit of a speaker, and the speaker can be a micro speaker. It should be noted that the magnetic circuit system 3 and the vibration system 2 of the sound generating device 100 are arranged oppositely.

[0071] It can be understood that the magnetic circuit system 3 and the vibration system 2 of the sound generating device 100 can be installed and fixed through the housing 1, that is, the magnetic circuit system 3 and the vibration system 2 are fixed on the housing 1, so that the sound generating device 100 is applied as an independent component in an electronic device or a sound generating module, which is not limited herein. Of course, in other embodiments, the outer peripheral edge 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 the vibration system 2 of the sound generating device 100 can be installed as a split structure in the housing of an electronic device or a sound generating module, which is not limited herein.

[0072] Optionally, the outer contour of the sound generating device 100 can be circular or square, so that the outer contours of the housing 1, the magnetic circuit system 3 and the vibration system 2 are correspondingly set to be circular or square, which is designed according to actual needs and is not limited herein. In this embodiment, the housing 1 can be selected as a frame or a framework structure, that is, the housing 1 has a cavity with openings at both ends. The magnetic circuit system 3 is connected to the housing 1, and the vibration system 2 is connected to the housing 1 and is opposite to and spaced from the magnetic circuit system 3. The housing 1 can be a steel sheet structure or a plastic structure, which is not limited herein.

[0073] Optionally, the housing 1 can be an integral structure or a structure formed by a plurality of split structures, which is not limited herein. It can be understood that the housing 1 is provided with conductive terminals, and the voice coil 22 is electrically connected to the conductive terminals. In this way, it is convenient for the sound generating device 100 to connect and conduct the voice coil 22 with an external circuit through the conductive terminals.

[0074] In this embodiment, the central magnetic part 33 includes two central magnets arranged opposite to and spaced from each other in the first direction. The two central magnets include a first central magnet 331 and a second central magnet 332. The first central magnet 331 is close to the top of the voice coil 22, and the second central magnet 332 is close to the bottom of the voice coil 22. It can be understood that the top of the voice coil 22 is the end where the voice coil 22 is connected to the first plate part 2121, and the bottom of the voice coil 22 is the end where the voice coil 22 is suspended in the magnetic gap 35.

[0075] It can be understood that by arranging the first central magnet 331 and the second central magnet 332 on opposite sides of the second plate part 2123, and the projections of the first central magnet 331 and the second central magnet 332 in the first direction are located inside the voice coil 22. When the voice coil 22 drives the diaphragm assembly 21 to vibrate, the second plate part 2123 vibrates between the first central magnet 331 and the second central magnet 332. At this time, the voice coil 22 and the second plate part 2123 cooperate to accommodate the first central magnet 331 and the second central magnet 332, and the voice coil 22 is affected by the magnetic field of the first central magnet 331 when approaching the first central magnet 331, and the voice coil 22 is affected by the magnetic field of the second central magnet 332 when approaching the second central magnet 332. In this way, the magnetic field strength in the area where the voice coil 22 is located can be increased, so as to increase the magnetic force received by the voice coil 22. Even when the voice coil 22 moves to the side away from the magnetic gap 35, under the action of the first central magnet 331 and the second central magnet 332, the magnetic force received by the voice coil 22 will be increased, thereby increasing the volume, improving the sound quality, and improving the acoustic performance of the sound generating device 100.

[0076] Meanwhile, by setting the central magnetic part 33 of the magnetic circuit system 3 as the first central magnet 331 and the second central magnet 332, and making one side of both the first central magnet 331 and the second central magnet 332 facing the diaphragm assembly 21 exposed to the internal cavity of the sound generating device 100, such that both the first central magnet 331 and the second central magnet 332 are magnetized along the first direction and the magnetization directions are opposite. Compared with the magnetic circuit structure of a conventional loudspeaker, the central magnetic part 33 of the present invention cancels the central washer (or central magnetic guide plate) structure, thereby reducing the thickness of the sound generating device 100 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 the magnetization directions are opposite, forming an opposing magnetic structure. The magnetic force lines generated by the first central magnet 331 and the second central magnet 332 repel each other and are all transmitted to the outside of the voice coil 22. As a result, the distribution of the magnetic force lines is more uniform, and the voice coil 22 can be in a dense magnetic induction line region during reciprocating vibration along the first direction. Thus, the BLx curve becomes flatter, thereby reducing distortion, as Figure 18 shown; and, on the premise that the thickness of the sound generating device is certain, the central magnetic part 33 of the present invention cancels the central washer (or central magnetic guide plate) structure. In this way, the cooperation of 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.

[0077] In an embodiment, the magnetic energy product of the first central magnet 331 is greater than that of the second central magnet 332. It can be understood that by setting in this way, the magnetic field intensity of the first central magnet 331 can be ensured to be greater than that of the second central magnet 332.

[0078] In this embodiment, as Figure 4 and Figure 7 shown, the edge magnetic part 34 is located outside the second central magnet 332, such that the magnetic field intensity in the magnetic gap 34 formed by the cooperation of the edge magnetic part 34 and the second central magnet 332 is greater than the magnetic field intensity of the first central magnet 331. By setting the magnetic energy product of the first central magnet 331 to be greater than that of the second central magnet 332, the magnetic field intensity at both ends of the voice coil 22 can be balanced, and the flatness of the BLx curve can be further improved, thereby reducing distortion.

[0079] Optionally, the volume of the first central magnet 331 is greater than that of the second central magnet 332. When the grades of the first central magnet 331 and the second central magnet 332 are the same, the magnetic field intensity of the first central magnet 331 can be ensured to be greater than that of the second central magnet 332. In this embodiment, as Figure 3 、 Figure 4 、 Figure 6 and Figure 7As 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 in the first direction is greater than that of the second central magnet 332 in the first direction. Thus, the magnetic field intensity of the first central magnet 331 is greater than that of the second central magnet 332.

[0080] Optionally, the voice coil 22 is an annular voice coil and extends in the first direction. In this way, the diaphragm 212 is arranged as a first plate portion 2121 and a second plate portion 2123 located on different horizontal planes in the first direction, so 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. The second plate portion 2123 is located inside the voice coil 22, and the outer periphery of the second plate portion 2123 is in contact with 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 center 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 receiving space for the first central magnet 331 to ensure the normal operation of the sound generating device 100.

[0081] The sound generating device 100 of the present invention is configured such that the magnetic circuit system 3 includes a central magnetic portion 33 and side magnetic portions 34 provided outside the central magnetic portion 33, with the side magnetic portions 34 spaced apart from the central magnetic portion 33 to form a magnetic gap 35. The vibration system 2 includes a diaphragm assembly 21 and a voice coil 22, with one end of the voice coil 22 suspended within the magnetic gap 35. When an electric current is passed through the voice coil 22, the voice coil 22 reciprocates within the magnetic field formed by the magnetic circuit system 3, driving the diaphragm assembly 21 to move in a first direction, thereby pushing air to generate sound. At the same time, the central magnetic portion 33 of the magnetic circuit system 3 is configured as a first central magnet 331 and a second central magnet 332 that are opposite and spaced apart in the first direction, with the first central magnet 331 close to the top of the voice coil 22 and the second central magnet 332 close to the bottom of the voice coil 22. The inner periphery of the diaphragm 211 of the diaphragm assembly 21 is connected to a vibration plate 212, and the vibration plate 212 is configured as a first plate portion 2121 and a second plate portion 2123 that are located at different horizontal levels in the first direction. 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. In this way, the first central magnet 331 and the second central magnet 332 are located on opposite sides of the second plate portion 2123, and the projections of the first central magnet 331 and the second central magnet 332 in the first direction are located inside the voice coil 22. The sides of the first central magnet 331 and the second central magnet 332 facing the diaphragm assembly 21 are both exposed to the internal cavity of the sound generating device 100. The first central magnet 331 and the second central magnet 332 are magnetized in the first direction with opposite magnetization directions, and the magnetic energy product of the first central magnet 331 is greater than that of the second central magnet 332. Thus, the cooperation between the first central magnet 331, the second central magnet 332, and the side magnetic portions 34 is used to increase the magnetic field strength in the region where the voice coil 22 is located, and the flatness of the BLx curve can also be improved. Even when the voice coil 22 moves to the side away from the magnetic gap 35, under the action of the first central magnet 331 and the second central magnet 332, the magnetic force received by the voice coil 22 will be increased, thereby increasing the volume, improving the sound quality, and enhancing the acoustic performance of the sound generating device 100.Moreover, by using the first plate portion 2121 and the second plate portion 2123 of the vibrating plate 212 located at different horizontal levels in the first direction, and the projections of the first central magnet 331 and the second central magnet 332 in the first direction being located inside the voice coil 22, during the movement of the diaphragm assembly 21, the cooperation between the voice coil 22 and the second plate portion 2123 is respectively used to provide accommodation spaces for the first central magnet 331 and the second central magnet 332, so that the first central magnet 331 and the second central magnet 332 can be closer to the voice coil 22, achieving a magnetic field enhancement effect. In this way, it can effectively solve the problem that during the reciprocating movement of the voice coil 22, the magnetic force is insufficient when the voice coil 22 is far from the magnetic gap 35, thereby affecting the acoustic performance. The first central magnet 331 and the second central magnet 332 cancel the structure of the conventional central washer. Not only can it achieve a thinning design, making the magnetic field line distribution more uniform and the BLx curve flatter, thereby reducing distortion. Moreover, under the condition of the same volume requirement, since the structure of the central washer is not provided, the volumes of the first central magnet 331 and the second central magnet 332 can be made larger, thereby improving the BL value of the product.;

[0082] In an embodiment, the vibrating plate 212 further includes a third plate portion 2124. The third plate portion 2124 is located inside the voice coil 22 and is attached to the inner peripheral wall of the voice coil 22. The two ends of the third plate portion 2124 in 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 an integrally formed structure.

[0083] In this embodiment, as Figures 6 to 8 、 Figure 10 and Figure 11 shown, by setting the vibrating plate 212 as an integrally formed structure, that is, the first plate portion 2121, the third plate portion 2124 and the second plate portion 2123 of the vibrating plate 212 are an integrally formed structure, it can not only improve the structural strength of the vibrating plate 212, but also improve the sealing performance. Optionally, the first plate portion 2121, the third plate portion 2124 and the second plate portion 2123 of the vibrating plate 212 can be formed into an integral stamping structure.

[0084] It can be understood that the third plate portion 2124 extends in the first direction, and the third plate portion 2124 is located inside the voice coil 22 and is attached to the inner peripheral wall of the voice coil 22, so that the first plate portion 2121 and the second plate portion 2123 of the vibrating plate 212 are connected to both ends of the third plate portion 2124 in the first direction, which can not only realize the connection and fixation of the first plate portion 2121 and the second plate portion 2123, but also further improve the connection stability and strength between the vibrating plate 212 and the voice coil 22 by using the first plate portion 2121 and the third plate portion 2124.

[0085] In this embodiment, the third plate portion 2124 of the vibrating plate 212 and the second plate portion 2123 are optionally arranged perpendicular to each other, so that the third plate portion 2124 and the second plate portion 2123 enclose a receiving groove 2125. The first plate portion 2121 extends in a direction away from the receiving groove 2125. 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.

[0086] It can be understood that in order to prevent the second plate portion 2123 from colliding and interfering with the first central magnet 331 and the second central magnet 332 when the voice coil 22 vibrates between the first central magnet 331 and the second central magnet 332 during vibration, optionally, the extension length of the third plate portion 2124 along the first direction is less than the extension length of the voice coil 22 along the first direction.

[0087] In an embodiment, the vibration system 2 further includes a waterproof film 23. The waterproof film 23 includes a first connecting portion 231 located at the top of the voice coil 22, a second connecting portion 232 attached to the inner peripheral wall of the voice coil 22, and a third connecting portion 233 located inside the voice coil 22. The first plate portion 2121 is connected to the first connecting portion 231, and the second plate portion 2123 is connected to the third connecting portion 233.

[0088] In this embodiment, as Figures 3 to 5 、 Figure 9 shown, by setting the vibrating plate 212 as a split structure, simultaneously setting the waterproof film 23, and setting the waterproof film 23 as the first connecting portion 231, the second connecting portion 232 and the third connecting portion 233, the second connecting portion 232 of the waterproof film 23 is attached to the inner peripheral wall of the voice coil 22, and the first connecting portion 231 is connected to the first plate portion 2121, and the third connecting portion 233 is connected to the second plate portion 2123. In this way, not only can the connection and fixation of the first plate portion 2121 and the second plate portion 2123 be realized, but also the connection stability and strength between the vibrating plate 212 and the voice coil 22 can be further improved by the cooperation of the waterproof film 23 and the vibrating plate 212, and the waterproof and sealing effect can be enhanced.

[0089] Optionally, the first connecting portion 231, the second connecting portion 232 and the third connecting portion 233 of the waterproof film 23 are an integrally formed structure. It can be understood that in this way, both the structural strength of the waterproof film 23 and the waterproof sealing performance can be improved.

[0090] In this embodiment, the second connecting portion 232 and the third connecting portion 233 of the waterproof film 23 are optionally arranged vertically, so that the second connecting portion 232 and the third connecting portion 233 enclose a receiving groove 2125, and the first connecting portion 231 extends in a direction away from the receiving groove 2125. 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 two ends of the second connecting portion 232 along the first direction.

[0091] It can be understood that in order to prevent the second plate portion 2123 from colliding and interfering with the first central magnet 331 and the second central magnet 332 when vibrating between the first central magnet 331 and the second central magnet 332 during the vibration of the voice coil 22, optionally, the extending length of the second connecting portion 232 of the waterproof film 23 along the first direction is less than the extending length of the voice coil 22 along the first direction.

[0092] 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 film 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. That is, the first plate portion 2121 is clamped between the top of the voice coil 22 and the first connecting portion 231; or, 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 clamped between the first plate portion 2121 and the top of the voice coil 22, which is not limited herein.

[0093] It can be understood that the second plate portion 2123 is connected to the third connecting portion 233 and is located on either side of the third connecting portion 233, which can strengthen the structure of the waterproof film 23. Optionally, the second plate portion 2123 is arranged 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 arranged on the side of the third connecting portion 233 facing the first central magnet 331.

[0094] It should be noted that the receiving groove 2125 not only provides a receiving space for the first central magnet 331, but also can prevent vibration from spreading along the surface of the diaphragm 211, thereby improving the acoustic performance of the sound generating device 100.

[0095] In one embodiment, as Figures 3 to 11 shown, the outer periphery of the first plate portion 2121 is recessed and bent towards the voice coil 22 to form a stepped portion 2122, and the inner peripheral edge of the diaphragm 211 is supported and lapped on the stepped portion 2122.

[0096] In this embodiment, by bending the outer periphery of the first plate portion 2121 inwards to form a stepped portion 2122, the inner periphery of the diaphragm 211 is fixed by means of the stepped portion 2122, and the inner periphery of the diaphragm 211 is positioned and limited. At the same time, when the inner periphery of the diaphragm 211 supports and abuts against the stepped portion 2122, the inner periphery of the diaphragm 211 is optionally flush with the first plate portion 2121. In this way, the matching structure between the first plate portion 2121 and the diaphragm 211 can be made more compact, reducing the occupied vibration space.

[0097] It can be understood that the stepped portion 2122 is formed by bending the outer periphery of the first plate portion 2121 towards the voice coil 22. In this way, a limiting groove is formed between the stepped portion 2122 and the inner periphery of the first plate portion 2121, and the stepped portion 2122 cooperates with the third plate portion 2124 or the second connecting portion 232 to limit and install the top of the voice coil 22, thereby further improving the connection stability of the voice coil 22.

[0098] In one embodiment, the distance from the side of the second plate portion 2123 facing the first central magnet 331 to the first central magnet 331 is the same as the distance from the side of the second plate portion 2123 facing the second central magnet 332 to the second central magnet 332. That is, along the first direction, the distances between the opposite sides of the second plate portion 2123 and the corresponding central magnets are the same.

[0099] In this embodiment, as Figure 4 、 Figure 7 shown, the second plate portion 2123 has a first surface on the side facing the first central magnet 331 and a second surface on the side 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. In this way, when the voice coil 22 drives the second plate portion 2123 to vibrate along the first direction, it can effectively prevent the second plate portion 2123 from colliding and interfering with the first central magnet 331 and the second central magnet 332. Optionally, the projection of the second plate portion 2123 along a direction perpendicular to the first direction is located in the middle of the voice coil 22.

[0100] In one embodiment, the magnetic circuit system 3 further includes a first magnetic yoke 31 and a second magnetic yoke 32 which are oppositely arranged. 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 and the edge magnetic portion 34 are both connected to the second magnetic yoke 32.

[0101] In this embodiment, as Figures 1 to 8 、 Figure 12 、 Figure 13As shown, by setting the first yoke 31 and the second yoke 32 such that the first yoke 31 and the second yoke 32 are oppositely arranged, the first yoke 31 and the second yoke 32 can be used to respectively mount and fix the first central magnet 331 and the second central magnet 332. At the same time, the magnetic field lines of the first central magnet 331 and the second central magnet 332 are concentrated to form a magnetic circuit.

[0102] It can be understood that one side of the first central magnet 331 facing away from the diaphragm assembly 21 is connected to the first yoke 31, and one side of the second central magnet 332 facing away from the diaphragm assembly 21 is connected to the second yoke 32. Optionally, the projected area of the first yoke 31 in the first direction is greater than or equal to the projected area of the first central magnet 331 in the first direction, and the projected area of the second yoke 32 in the first direction is greater than or equal to the projected area of the second central magnet 332 in the first direction. In this way, not only the first central magnet 331 and the second central magnet 332 are mounted and fixed, but also a magnetic concentrating effect is achieved. In this embodiment, the first yoke 31 and the second yoke 32 can be selected as a magnetic conductive plate structure.

[0103] In one embodiment, the first yoke 31 is provided with a first recess corresponding to the first central magnet 331, and the first central magnet 331 is disposed in the first recess. It can be understood that such a setting can use the first recess to position and install the first central magnet 331, improve the installation stability, and reduce the assembly height between the first central magnet 331 and the first yoke 31, increasing the vibration space of the diaphragm assembly 21.

[0104] In this embodiment, the first recess can be formed by the side of the first yoke 31 facing the first central magnet 331 being recessed, and at this time, the side of the first yoke 31 facing away from the first central magnet 331 is flat; or, the first recess can be formed by the first yoke 31 being bent toward the side away from the first central magnet 331, and at this time, the side of the first yoke 31 facing away from the first central magnet 331 is convex corresponding to the position of the first recess, which is not limited herein.

[0105] In one embodiment, as Figure 3 , Figure 4 , Figure 6 and Figure 7 shown, the second yoke 32 is provided with a second recess 321 corresponding to the second central magnet 332, and the second central magnet 332 is disposed in the second recess 321. It can be understood that such a setting can use the second recess 321 to position and install the second central magnet 332, improve the installation stability, and reduce the assembly height between the second central magnet 332 and the second yoke 32, increasing the vibration space of the diaphragm assembly 21.

[0106] In this embodiment, the second recessed groove 321 may be formed by recessing one side of the second yoke 32 facing the second central magnet 332. At this time, the side of the second yoke 32 facing away from the second central magnet 332 is a plane; or, the second recessed groove 321 may be formed by bending one side of the second yoke 32 facing away from the second central magnet 332. At this time, the side of the second yoke 32 facing away from the second central magnet 332 is convexly provided corresponding to the position of the second recessed groove 321, and no limitation is made here.

[0107] In an embodiment, the magnetic circuit system 3 further includes a side magnetic part 34 provided on the second yoke 32. The side magnetic part 34 is located outside the second central magnet 332 and is spaced from the second central magnet 332 to form a magnetic gap 35.

[0108] In this embodiment, as Figures 3 to 8 shown, by providing the side magnetic part 34 on the second yoke 32 and located outside the second central magnet 332, the side magnetic part 34 is spaced from the second central magnet 332 to form a magnetic gap 35. In this way, the magnetic field strength in the magnetic gap 35 can be effectively ensured.

[0109] It can be understood that the side magnetic part 34 not only forms a magnetic circuit with the second central magnet 332 through the second yoke 32, so that the magnetic force lines in the magnetic gap 35 pass through the voice coil 22, but also the side magnetic part 34 forms a magnetic circuit with the first central magnet 331 and the first yoke 31. When the voice coil 22 approaches the first central magnet 331, more magnetic force lines pass through the voice coil 22, thereby increasing the magnetic force received by the voice coil 22, effectively improving the BL value, making the magnetic force line distribution more uniform, and making the BLx curve flatter, thereby reducing distortion.

[0110] It should be noted that the side magnetic part 34 may be an integral structure. For example, the side magnetic part 34 is annularly arranged and surrounds the outside of the second central magnet 332. Of course, the side magnetic part 34 may also be a split structure. At this time, the side magnetic part 34 includes a plurality of parts, and the plurality of side magnetic parts 34 are spaced and surround the outside of the second central magnet 332, and no limitation is made here.

[0111] In an embodiment, the side magnetic part 34 includes a side magnet 341 and a side magnetic conductive plate 342 arranged in a stacked manner. The side magnet 341 is located outside the second central magnet 332 and is spaced from the second central magnet 332 to form a magnetic gap 35.

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

[0113] Optionally, the structural profiles of the edge magnet 341 of the edge magnetic part 34 and the edge magnetic conductive plate 342 are similar. That is, when the edge magnetic part 34 is an integral annular structure, both the edge magnet 341 and the edge magnetic conductive plate 342 are in an integral annular structure; or when the edge magnetic part 34 is a split structure, both the edge magnet 341 and the edge magnetic conductive plate 342 are split structures and correspond one by one. Of course, in other embodiments, the structures of the edge magnet 341 and the edge magnetic conductive plate 342 of the edge magnetic part 34 may also be different. For example, one of the edge magnet 341 and the edge magnetic conductive plate 342 is an integral annular structure, and the other is a split structure, which is not limited herein.

[0114] In one embodiment, the projection of the edge magnetic conductive plate 342 along a direction perpendicular to the first direction is located between the top and the 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 does not vibrate, the projection of the edge magnetic conductive plate 342 along a direction perpendicular to the first direction is located between the top and the bottom of the voice coil 22. In this way, it can be ensured that the voice coil 22 can reciprocally approach the first central magnet 331 or the second central magnet 332 during the vibration process, so as to ensure that the magnetic force received by the voice coil 22 when it moves to the side away from the magnetic gap 35 remains unchanged or changes very little, and the magnetic field line distribution of the magnetic circuit system 3 is more uniform, and the BLx curve is flatter, thereby reducing distortion.

[0116] It should be noted that when the voice coil 22 has a small amplitude, the projection of the edge magnetic conductive plate 342 along a direction perpendicular to the first direction is located between the top and the bottom of the voice coil 22. For the voice coil 22 with a small amplitude, it is only when the voice coil 22 does not vibrate that the projection of the edge magnetic conductive plate 342 along a direction perpendicular to the first direction is located between the top and the bottom of the voice coil 22, which is not limited herein.

[0117] In one embodiment, the projection of the edge magnetic conductive 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 shown, by arranging the projection of the edge magnetic conductive plate 342 of the edge magnetic part 34 along a direction perpendicular to the first direction between the surfaces of the first central magnet 331 and the second central magnet 332 facing the diaphragm assembly 21, it can be ensured that the edge magnetic part 34 can respectively form a magnetic circuit with the first central magnet 331 and the second central magnet 332, so that more magnetic field lines pass through the voice coil 22, thereby increasing the magnetic field strength, effectively improving the BL value, making the magnetic field line distribution more uniform, and making the BLx curve flatter, thereby reducing distortion.

[0119] Optionally, the thickness of the side magnet 341 in the first direction is greater than the thickness of the second central magnet 332 in the first direction. In this embodiment, by setting the thickness of the side magnet 341 in the first direction to be greater than the thickness of the second central magnet 332 in the first direction, on the one hand, it is ensured that the projection of the side magnetic conduction plate 342 in the direction perpendicular to the first direction is arranged between the surfaces of the first central magnet 331 and the second central magnet 332 facing the diaphragm assembly 21. At the same time, it should be noted that the side magnet 341 needs to cooperate with the first central magnet 331 and the second central magnet 332 respectively to form corresponding magnetic circuits. The above setting can also ensure that the side magnet 341 forms magnetic circuits with equivalent magnetic field intensities with the first central magnet 331 and the second central magnet 332 respectively.

[0120] Of course, in other embodiments, the second magnetic yoke 32 includes a bottom portion and a side portion (not shown in the figure) bent and extended from the periphery of the bottom portion toward the diaphragm assembly 21. The second central magnet 332 is disposed on the bottom portion and is spaced apart from the side portion to form a magnetic gap 35. It can be understood that by setting the second magnetic yoke 32 to have a bottom portion and a side portion arranged at an angle, the side portion of the second magnetic yoke 32 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 bottom portion and the side portion of the second magnetic yoke 32 can be an integrally formed structure, and the bottom portion and the side portion are perpendicularly arranged, which is not limited herein.

[0121] In one embodiment, as Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 12 and Figure 13 shown, the outer periphery of the first magnetic yoke 31 is bent and extended toward the second magnetic yoke 32 to form a first welding portion 315, and the first welding portion 315 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. In this way, when the sound generating device 100 is applied to an electronic device and drops or other phenomena occur, the structure of the sound generating device 100 can be ensured to be stable.

[0122] Optionally, there are multiple first welding portions 315, and the multiple first welding portions 315 are spaced apart and arranged on the outer periphery of the first magnetic yoke 31, and the multiple first welding portions 315 are all welded to the outer periphery of the second magnetic yoke 32, which is not limited herein.

[0123] In this embodiment, as Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 12 and Figure 13As shown, the first yoke 31 includes a top plate portion 311 and a side plate portion 312 arranged at an angle, and a part of the side plate portion 312 extends toward the second yoke 32 to form a first welding portion 315. Optionally, the top plate portion 311, the side plate portion 312, and the first welding portion 315 of the first yoke 31 are of an integrally formed structure, which is not limited herein.

[0124] In an embodiment, the outer periphery of the second yoke 32 bends and extends toward the first yoke 31 to form a second welding portion, and the second welding portion is welded to the outer periphery of the first yoke 31. It can be understood that by welding the second welding portion of the second yoke 32 to the first yoke 31, the connection stability is improved. In this way, when the sound generating device 100 is applied to an electronic device and phenomena such as dropping occur, the structure of the sound generating device 100 can be ensured to be stable.

[0125] Optionally, there are multiple second welding portions, and the multiple second welding portions are arranged at intervals on the outer periphery of the second yoke 32, and all the multiple second welding portions are welded to the outer periphery of the first yoke 31, which is not limited herein.

[0126] In this embodiment, the second yoke 32 includes a top wall and a side wall arranged at an angle, and a part of the side wall extends toward the first yoke 31 to form a second welding portion. Optionally, the top wall, the side wall, and the second welding portion of the second yoke 32 are of an integrally formed structure, which is not limited herein.

[0127] In an embodiment, the sound generating device 100 further includes a housing 1. The housing 1 is respectively connected to the first yoke 31 and the second yoke 32 and is located between the first yoke 31 and the second yoke 32. The first yoke 31 at least includes a top plate portion 311 on the side of the diaphragm assembly 21 facing away from the second yoke 32. The first central magnet 331 is arranged on the top plate portion 311. The outer peripheral edge of the diaphragm 211 is connected to one end of the housing 1 away from the second yoke 32, and the diaphragm 211 is opposite to and spaced from the top plate portion 311.

[0128] In this embodiment, as Figures 1 to 4 、 Figure 6 、 Figure 7 shown, by providing the housing 1, the magnetic circuit system 3 and the vibration system 2 are installed and fixed by using the housing 1. It can be understood that the housing 1 is located between the first yoke 31 and the second yoke 32 along the first direction. The first yoke 31 is connected to the housing 1, and the second yoke 32 can be connected to the housing 1 directly or indirectly, which is not limited herein.

[0129] It can be understood that the first yoke 31 at least includes a top plate portion 311 located on the side of the diaphragm assembly 21 facing away from the second yoke 32, so as to install and fix the first central magnet 331 by using the top plate portion 311. In this way, the outer periphery of the diaphragm 211 is connected to one end of the housing 1 away from the second yoke 32, so that the diaphragm 211 is opposite to and spaced from the top plate portion 311, thus ensuring the vibration of the diaphragm 211.

[0130] In this embodiment, the first yoke 31 may be a flat plate structure. At this time, the first yoke 31 is formed as the top plate portion 311, and the first yoke 31 and the housing 1 may be an integrally formed structure. Optionally, the housing 1 is a plastic housing, and the housing 1 and the first yoke 31 are integrally injection molded. Of course, in other embodiments, the first yoke 31 and the housing 1 may also be connected by welding or bonding, which is not limited herein.

[0131] It can be understood that the housing 1 may be a frame structure or a frame with openings at both ends. At this time, the first yoke 31 is connected to one end of the housing 1, and the second yoke 32 is located at one end of the housing 1 away from the first yoke 31. Of course, in other embodiments, the housing 1 includes a flat portion and a vertical portion arranged at an angle, an installation opening is provided on the flat portion, the first yoke 31 is arranged at the installation opening, and the second yoke 32 is located on the side of the vertical portion of the housing 1 facing away from the flat portion, which is not limited herein.

[0132] In one embodiment, the first yoke 31 further includes a side plate portion 312 arranged at an angle with 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, and the outer periphery of the diaphragm 211 is clamped between the housing 1 and the support platform 313.

[0133] In this embodiment, as Figure 1 、 Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 、 Figure 12 and Figure 13 shown, by setting the first yoke 31 as the top plate portion 311 and the side plate portion 312 arranged at an angle, and arranging the support platform 313 on the side plate portion 312, the support platform 313 can be used to both position and install the housing 1, and the outer periphery of the diaphragm 211 can be fixed by the housing 1 and the support platform 313. Moreover, the support platform 313 can position the outer periphery of the diaphragm 211 away from the top plate portion 311, thus ensuring the vibration of the diaphragm 211.

[0134] It can be understood that the side plate portion 312 of the first yoke 31 and the housing 1 may be integrally formed. For example, the housing 1 is a plastic housing, and the housing 1 and the first yoke 31 are integrally injection molded. Of course, in other embodiments, the side plate portion 312 of the first yoke 31 and the housing 1 may be connected by welding or bonding, which is not limited herein.

[0135] Of course, in other embodiments, the outer peripheral edge of the diaphragm 211 may also be fixed to the inner wall of the housing 1. For example, a support platform or other structures are convexly provided on the inner wall of the housing 1, and the outer peripheral edge of the diaphragm 211 is fixed to such support platform or other structures, which is not limited herein.

[0136] In one embodiment, the side magnetic part 34 includes a side magnet 341 and a side magnetic conductive plate 342 which are stacked. The side magnet 341 is connected to the second magnetic yoke 32, and the side magnetic conductive plate 342 is connected to the housing 1; wherein, the side magnetic conductive plate 342 and the housing 1 are of an integrally formed structure.

[0137] In this embodiment, as Figures 3 to 8 shown, the side magnetic part 34 of the magnetic circuit system 3 is arranged on the second magnetic yoke 32, and the second magnetic yoke 32 can be connected to the housing 1 through the side magnetic part 34. Optionally, the side magnetic conductive plate 342 of the side magnetic part 34 and the housing 1 may be of an integrally formed structure. For example, the housing 1 is a plastic housing, and the housing 1 and the side magnetic conductive plate 342 are integrally injection molded; or, the housing 1 is a metal housing, and at this time the housing 1 and the side magnetic conductive plate 342 are integrally drawn, which is not limited herein. Of course, in other embodiments, the housing 1 and the side magnetic conductive plate 342 may also be connected by welding or bonding, which is not limited herein.

[0138] It should be noted that the housing 1 is used not only to fix the diaphragm 211 of the magnetic circuit system 3 and the vibration system 2, but also 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 relatively and spaced apart.

[0139] 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 in the first cavity 11, and the sound generating device 100 is further provided with a sound outlet hole 314 communicating with the first cavity 11.

[0140] In this embodiment, as Figure 4 and Figure 7 shown, a first cavity 11 is formed between the first magnetic yoke 31 and the diaphragm assembly 21. The first cavity 11 is used to provide a vibration space for the diaphragm 211 and at the same time provide an installation space for the first central magnet 331. It can be understood that in order to enable the diaphragm 211 to generate sound smoothly during vibration, the sound generating device 100 is further provided with a sound outlet hole 314 communicating with the first cavity 11.

[0141] It can be understood that the sound outlet hole 314 is arranged on the housing 1; or, the sound outlet hole 314 is arranged on the first magnetic yoke 31; or, the sound outlet hole 314 is arranged at the connection between the housing 1 and the first magnetic yoke 31, which is not limited herein.

[0142] In one embodiment, the first yoke 31 includes a top plate portion 311 and a side plate portion 312 arranged at an included angle; wherein, the sound outlet hole 314 is provided on the top plate portion 311 and is opposite to the diaphragm 211; alternatively, the sound outlet hole 314 is provided on the side plate portion 312.

[0143] It can be understood that when the sound outlet hole 314 of the sound generating device 100 is provided on the top plate portion 311 and is opposite to the diaphragm 211, when the sound generating device 100 is applied to an electronic device or a sound generating module, at this time, a sound outlet is provided on the housing of the electronic device or the sound generating module and is directly opposite to the sound outlet hole 314, so that the electronic device or the sound generating module has a front sound output 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, so that the sound outlet is communicated with the sound outlet hole 314 through a sound outlet channel, thereby making the electronic device or the sound generating module have a side sound output structure.

[0144] Certainly, in other embodiments, when the sound outlet hole 314 of the sound generating device 100 is provided on the side plate portion 312, when the sound generating device 100 is applied to an electronic device or a sound generating module, when the sound outlet on the housing of the electronic device or the sound generating module is directly opposite to the diaphragm 211 of the sound generating device 100, the sound outlet is communicated with the sound outlet hole 314 through a sound outlet channel, so that the electronic device or the sound generating module has a front sound output 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 communicated with the sound outlet hole 314, thereby making the electronic device or the sound generating module have a side sound output structure.

[0145] As Figures 14 to 17 shown, the present invention also provides a sound generating module 500, which includes the above-mentioned sound generating device 100. The specific structure of the sound generating device 100 refers to the foregoing embodiments. Since this electronic device adopts all the technical solutions of the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, and will not be elaborated herein one by one.

[0146] In one embodiment, the sound generating module 500 further includes a module housing 400. The module housing 400 is provided with an accommodation cavity. The sound generating device 100 is arranged in the accommodation cavity and divides the accommodation cavity into a front cavity and a rear cavity 420; wherein, the module housing 400 is provided with a sound outlet 410 communicating with the front cavity.

[0147] In this embodiment, the module housing 400 can be a metal housing or a plastic housing, which is not limited herein. The module housing 400 can be an integral structure or a split structure, which is not limited herein. The module housing 400 includes a module upper shell and a module lower shell. The module upper shell and the module lower shell are butt-connected and enclose to form an accommodation cavity. Optionally, the module upper shell and the module lower shell can be adhesively connected or welded.

[0148] Optionally, the outer contour of the module housing 400 may be a square structure. In specific applications, other suitable shapes such as a circle can be selected according to the actual situation, and it is not limited to a specific shape.

[0149] In this embodiment, the sound generating device 100 is disposed in the accommodation cavity and divides the accommodation cavity into a front cavity and a rear cavity 420. At this time, the upper module housing corresponds to the front cavity, and the lower module housing corresponds to the rear cavity 420. It can be understood that the sound outlet 410 is disposed on the upper module housing or at the connection between the upper module housing and the lower module housing.

[0150] In one embodiment, the module housing 400 is further provided with a sound leakage hole communicating with the rear cavity 420 for adjusting the pressure in the rear cavity 420. It can be understood that the sound leakage hole is disposed on the lower module housing. Optionally, the sound leakage hole can be a round hole, an oval hole or a polygonal hole, etc., which is not limited herein. The number of sound leakage holes can be one or more, which is specifically designed according to actual applications and is not limited herein.

[0151] It can be understood that the upper module housing includes a top wall and a first side wall, and the lower module housing includes a bottom wall and a second side wall. The first side wall and the second side wall together form the side wall of the module housing 400 of the sound generating module 500, that is, the module housing 400 includes a top wall and a bottom wall arranged oppositely and a side wall connecting the top wall and the bottom wall. Optionally, the sound outlet 410 is disposed on the top wall or in the connection area between the side wall and the top wall, and the sound leakage hole is disposed on the side wall or the bottom wall or in the connection area between the side wall and the bottom wall. In this way, the sound generating performance of the sound generating module 500 and the technical effect of protecting privacy can be taken into account, and the most suitable design solution can be selected according to actual needs during use, which is not limited in the present invention.

[0152] In this embodiment, as Figures 14 to 17 shown, the top wall of the upper module housing is provided with a first opening, and the bottom wall of the lower module housing is provided with a second opening. When the sound generating device 100 is installed in the module housing 400, the first yoke 31 of the sound generating device 100 corresponds to or is located at the first opening, and the second 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 the sound outlet 410; or the first opening is only used for installing the sound generating device 100 to reduce the thickness of the sound generating module 500 in the Z direction, which is not limited herein.

[0153] In one embodiment, as Figure 16 and Figure 17 shown, the sound outlet 410 is disposed opposite to the diaphragm assembly 21 of the sound generating device 100, so that the sound generating module 500 has a front sound output structure. It can be understood that when the sound outlet 410 of the sound generating module 500 is disposed opposite to the diaphragm assembly 21 of the sound generating device 100, the sound generating module 500 has a front sound output structure at this time.

[0154] Optionally, the sound outlet 410 is disposed opposite to and in communication with the sound outlet hole 314 of the sound generating device 100; alternatively, the sound outlet 410 is in communication with the sound outlet hole 314 of the sound generating device 100 through a sound outlet channel, which is not limited herein.

[0155] In one embodiment, as Figure 14 and Figure 15 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 sound output 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 opposite to the diaphragm assembly 21 of the sound generating device 100, but is located on the peripheral side of the diaphragm assembly 21. At this time, the sound generating module 500 has a side sound output structure.

[0156] Optionally, the sound outlet 410 is disposed opposite to and in communication with the sound outlet hole 314 of the sound generating device 100; alternatively, the sound outlet 410 is in communication with the sound outlet hole 314 of the sound generating device 100 through a sound outlet channel, which is not limited herein.

[0157] The present invention also provides an electronic device, which includes the above-mentioned sound generating device 100. The specific structure of the sound generating device 100 refers to the foregoing embodiments. Since this electronic device adopts all the technical solutions of the foregoing all embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, and will not be described in detail herein.

[0158] The present invention also provides an electronic device, which includes the above-mentioned sound generating module 500. The specific structure of the sound generating module 500 refers to the foregoing embodiments. Since this electronic device adopts all the technical solutions of the foregoing all embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, and will not be described in detail herein.

[0159] Optionally, the above-mentioned electronic device may be a mobile phone, earphone, computer, PAD, smart wearable device, etc., and the present invention does not make specific limitations thereto.

[0160] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A sound generating device, characterized in that, The sound generating device includes: a vibration system that vibrates in a first direction, the vibration system including a diaphragm assembly and a voice coil, the diaphragm assembly including a diaphragm and a vibration plate, an inner peripheral edge of the diaphragm being connected to the vibration plate, the vibration plate including a first plate portion and a second plate portion located on different horizontal planes, the voice coil being an annular voice coil and extending in the first direction, a top of the voice coil being connected to the first plate portion, the second plate portion being located inside the voice coil, and an outer periphery of the second plate portion abutting against an inner peripheral wall of the voice coil; and a magnetic circuit system including a central magnetic portion and a side magnetic portion provided outside the central magnetic portion, the side magnetic portion being spaced apart from the central magnetic portion to form a magnetic gap, an end of the voice coil away from the first plate portion being suspended in the magnetic gap, the central magnetic portion including a first central magnet and a second central magnet that are opposite and spaced apart in the first direction, the first central magnet and the second central magnet being located on opposite sides of the second plate portion and having a projection in the first direction located inside the voice coil, and sides of the first central magnet and the second central magnet facing the diaphragm assembly being exposed in an internal cavity of the sound generating device; wherein, the first central magnet is close to the top of the voice coil, the second central magnet is close to the bottom of the voice coil, the first central magnet and the second central magnet are both magnetized in the first direction and have opposite magnetization directions, and the magnetic energy product of the first central magnet is greater than the magnetic energy product of the second central magnet.

2. The sound generating device according to claim 1, wherein The vibration plate further includes a third plate portion located inside the voice coil and fittingly connected to the inner peripheral wall of the voice coil, and two ends of the third plate portion in the first direction are respectively connected to the first plate portion and the second plate portion; wherein, the first plate portion, the third plate portion and the second plate portion are of an integrally formed structure.

3. The sound generating device according to claim 1, wherein The vibration system further includes a waterproof film, the waterproof film including a first connection portion located at the top of the voice coil, a second connection portion fittingly connected to the inner peripheral wall of the voice coil, and a third connection portion located inside the voice coil, the first plate portion being connected to the first connection portion, and the second plate portion being connected to the third connection portion.

4. The sound generating device according to claim 3, characterized in that, The first connection portion is clamped between the first plate portion and the top of the voice coil; and / or, the second plate portion is provided on a side of the third connection portion facing the first central magnet; and / or, the first connection portion, the second connection portion and the third connection portion are of an integrally formed structure; and / or, an extension length of the second connection portion in the first direction is less than an extension length of the voice coil in the first direction; and / or, the first connection portion and the third connection portion are respectively connected to two ends of the second connection portion in the first direction.

5. The sound generating device according to claim 1, wherein An outer periphery of the first plate portion is recessed and bent towards the voice coil to form a stepped portion, and an inner peripheral edge of the diaphragm is supported and lapped on the stepped portion; And / or, the distance from the side of the second plate portion facing the first central magnet to the first central magnet is the same as the distance from the side of the second plate portion facing the second central magnet to the second central magnet.

6. The sound generating device according to claim 1, wherein, The magnetic circuit system further includes a first yoke and a second yoke which are oppositely arranged. One side of the first central magnet facing away from the diaphragm assembly is connected to the first yoke, and one side of the second central magnet facing away from the diaphragm assembly and the edge magnetic portion are both connected to the second yoke.

7. The sound generating device according to claim 6, wherein, The outer periphery of the first yoke bends and extends towards the second yoke to form a first welding portion, and the first welding portion is welded and connected to the outer periphery of the second yoke. And / or, the outer periphery of the second yoke bends and extends towards the first yoke to form a second welding portion, and the second welding portion is welded and connected to the outer periphery of the first yoke.

8. The sound generating device according to claim 6, wherein The sound generating device further includes a housing which is respectively connected to the first yoke and the second yoke and is located between the first yoke and the second yoke. The first yoke at least includes a top plate portion located on the side of the diaphragm assembly facing away from the second yoke. The first central magnet is arranged on the top plate portion. The outer peripheral edge of the diaphragm is connected to one end of the housing away from the second yoke, and the diaphragm is opposite to and spaced from the top plate portion.

9. The sound generating device according to claim 8, wherein The first yoke further includes a side plate portion arranged at an angle with the top plate portion. The side plate portion bends towards the diaphragm assembly to form a support platform, and the outer peripheral edge of the diaphragm is clamped between the housing and the support platform. And / or, the housing is a plastic housing, and the housing and the first yoke are integrally injection molded.

10. The sound generating device according to claim 8, wherein, The edge magnetic portion includes a stacked edge magnet and an edge magnetic guide plate. The edge magnet is connected to the second yoke, and the edge magnetic guide plate is connected to the housing. Wherein, the edge magnetic guide plate and the housing are of an integrally formed structure.

11. The sound generating device according to claim 8, wherein, A first cavity is formed between the first yoke and the diaphragm assembly. The first central magnet is located in the first cavity. The sound generating device is further provided with a sound outlet hole communicating with the first cavity. Wherein, the sound outlet hole is arranged on the housing. Or, the first yoke includes a top plate portion and a side plate portion arranged at an angle; wherein, the sound outlet hole is arranged on the top plate portion and is opposite to the diaphragm; or, the sound outlet hole is arranged on the side plate portion. Or, the sound outlet hole is arranged at the connection position between the housing and the first yoke.

12. The sound generating device according to claim 1, characterized in that The edge magnetic portion includes a stacked edge magnet and an edge magnetic guide plate. The edge magnet is located outside the second central magnet and is spaced from the second central magnet to form the magnetic gap; wherein, the projection of the edge magnetic guide plate along a direction perpendicular to the first direction is located between the top and the bottom of the voice coil; and / or, the projection of the edge magnetic guide plate along a direction perpendicular to the first direction is located between the surfaces of the first central magnet and the second central magnet facing the diaphragm assembly; and / or, the thickness of the edge magnet along the first direction is greater than the thickness of the second central magnet along the first direction. And / 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 in the first direction is greater than the thickness of the second central magnet in the first direction.

13. A sound generating module, characterized in that, The sound generating module includes: A module housing provided with an accommodation cavity; and The sound generating device according to any one of claims 1 to 12, the sound generating device is disposed in the accommodation cavity and divides the accommodation cavity into a front cavity and a rear cavity; Wherein, the module housing is provided with a sound outlet communicating with the front cavity.

14. The sound generating module according to claim 13, wherein The sound outlet is disposed opposite to the diaphragm assembly of the sound generating device, so that the sound generating module has a front sound output structure; or, the sound outlet is located on one side of the sound generating device, so that the sound generating module has a side sound output structure; And / or, the module housing is further provided with a sound leakage hole communicating with the rear cavity.

15. An electronic device, characterized in that, The electronic device includes the sound generating module according to claim 13 or 14; Or, the electronic device includes the sound generating device according to any one of claims 1 to 12.

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