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, a second plate part and a third plate part which are integrally arranged, the first plate part and the second plate part are located on different horizontal planes, the top of a voice coil is connected with the first plate part, and the top of the voice coil is connected with the third plate part. The third plate part is connected with the inner circumferential wall of the voice coil in an attached mode, the two ends, in the first direction, of the third plate part are connected with the first plate part and the second plate part respectively, and 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 sides, facing the vibrating diaphragm assembly, of the first center magnet and the second center magnet are both exposed in the inner cavity of the sound production device, and the first center magnet and the second center magnet are magnetized in the first direction and are opposite in magnetizing direction. 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 lightness and thinness of electronic products. As the sound generating unit of intelligent electronic products, the high performance, high sound quality, lightness and thinness of speakers have gradually become the mainstream demands of consumers.

[0003] In related technologies, a magnetic field is formed by a central magnetic part and a side magnetic part of a speaker. 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 area close to the central magnetic part and the side magnetic part, and weaker in the area 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, which will cause insufficient magnetic force, thereby affecting 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 spacer. Most of the magnetic lines of force are concentrated near the central spacer. 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 cannot meet the requirements of lightness and 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 in turn 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 the BLx curve more flat, thereby reducing distortion.

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

[0006] A vibration system, which vibrates along a first direction. The vibration system includes a diaphragm assembly and a voice coil. The diaphragm assembly includes a diaphragm and a vibrating plate. The inner peripheral edge of the diaphragm is connected to the vibrating plate. The vibrating plate includes a first plate portion, a second plate portion, and a third plate portion that are integrally provided. The first plate portion and the second plate portion are 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 portion. The second plate portion is located inside the voice coil, and the outer periphery of the second plate portion abuts against the inner peripheral wall of the voice coil. The third plate portion is attached to and connected to the inner peripheral wall of the voice coil, and both ends of the third plate portion along the first direction are respectively connected to the first plate portion and the second plate portion; and

[0007] A magnetic circuit system, which includes a central magnetic portion and a side magnetic portion provided outside the central magnetic portion. The side magnetic portion and the central magnetic portion are spaced apart to form a magnetic gap. One end of the voice coil away from the first plate portion is suspended in the magnetic gap. The central magnetic portion includes a first central magnet and a second central magnet that are opposite and spaced apart along the first direction. The first central magnet and the second central magnet are located on opposite sides of the second plate portion and are located inside the voice coil in the projection along the first direction. One side of the first central magnet and the second central magnet facing the diaphragm assembly is exposed in the internal cavity of the sound generating device;

[0008] Wherein, both the first central magnet and the second central magnet are magnetized along the first direction and the magnetization directions are opposite.

[0009] In one embodiment, the extension length of the third plate portion along the first direction is less than the extension length of the voice coil along the first direction;

[0010] And / or, 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;

[0011] And / or, the distance from one side of the second plate portion facing the first central magnet to the first central magnet is the same as the distance from one side of the second plate portion facing the second central magnet to the second central magnet.

[0012] In one embodiment, the magnetic circuit system further includes a first magnetic yoke and a second magnetic yoke that are oppositely arranged. The side of the first central magnet facing away from the diaphragm assembly is connected to the first magnetic yoke, and the side of the second central magnet facing away from the diaphragm assembly and the side magnetic portion are both connected to the second magnetic yoke.

[0013] In one embodiment, the outer periphery of the first magnetic yoke is bent and extended towards the second magnetic yoke to form a first welding portion, and the first welding portion is welded to the outer periphery of the second magnetic yoke;

[0014] 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.

[0015] In one embodiment, the sound generating device further includes a housing, the housing 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 disposed 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.

[0016] In one embodiment, the first yoke further includes a side plate portion disposed 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;

[0017] And / or, the housing is a plastic housing, and the housing and the first yoke are integrally injection molded.

[0018] In one embodiment, 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;

[0019] Wherein, the edge magnetic guide plate and the housing are an integrally formed structure.

[0020] In one embodiment, a first cavity is formed between the first yoke and the diaphragm assembly. The first central magnet is located in the first cavity, and the sound generating device is further provided with a sound outlet hole communicating with the first cavity;

[0021] Wherein, the sound outlet hole is disposed on the housing;

[0022] Or, the first yoke includes a top plate portion and a side plate portion disposed at an angle; wherein, the sound outlet hole is disposed on the top plate portion and is opposite to the diaphragm; or, the sound outlet hole is disposed on the side plate portion;

[0023] Or, the sound outlet hole is disposed at the connection between the housing and the first yoke.

[0024] In one embodiment, 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;

[0025] Wherein, the projection of the side magnetic conductive plate perpendicular to the first direction is located between the top and the bottom of the voice coil; and / or, the projection of the side magnetic conductive plate 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 side magnet in the first direction is greater than the thickness of the second central magnet in the first direction.

[0026] The present invention further provides a sound generating module, which includes:

[0027] A module housing, which is provided with a receiving cavity; and

[0028] 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;

[0029] Wherein, the module housing is provided with a sound outlet communicating with the front cavity.

[0030] In an embodiment, the sound outlet is arranged 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;

[0031] And / or, the module housing is further provided with a sound leakage hole communicating with the rear cavity.

[0032] The present invention further provides an electronic device, which includes the above-mentioned sound generating module;

[0033] Or, the electronic device includes the above-mentioned sound generating device.

[0034] The sound generating device of the technical solution of the present invention sets the magnetic circuit system as a central magnetic part and side magnetic parts arranged outside the central magnetic part, so that the side magnetic parts are spaced apart from the central magnetic part to form a magnetic gap, and sets the vibration system as a diaphragm assembly and a voice coil, so that one end of the voice coil is suspended in the magnetic gap. Thus, when an electric 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 apart in the first direction. The inner peripheral edge of the diaphragm of the diaphragm assembly is connected to a vibration plate, and the vibration plate is set as a first plate part, a second plate part, and a third plate part that are integrally arranged. The two ends of the third plate part in the first direction are respectively connected to the first plate part and the second plate part, so as to improve the waterproof and sealing effect of the vibration plate. The voice coil is set as an annular voice coil and extends in the first direction, so that the top of the voice coil is connected to the first plate part, and the third plate part is in fit connection with the inner peripheral wall of the voice coil, so that 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. The first central magnet and the second central magnet are respectively arranged on opposite sides of the second plate part, so that the projections of the first central magnet and the second central magnet in the first direction are located inside the voice coil. One 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, and the first central magnet and the second central magnet are both magnetized in the first direction and the magnetization directions are opposite. Thus, the magnetic field intensity in the area where the voice coil is located is enhanced by the cooperation of the first central magnet and the second central magnet with the side magnetic parts, so as to enhance 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. Thus, during the movement of the diaphragm assembly, the cooperation between the voice coil and the third plate part and the second plate part respectively provides 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, the problem that the magnetic force is insufficient when the voice coil moves away from the magnetic gap during the reciprocating movement of the voice coil, which affects the acoustic performance, can be effectively solved. The first central magnet and the second central magnet cancel the structure of the conventional central washer. Not only can a thinning 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 set, the volumes of the first central magnet and the second central magnet can be made larger, so as to improve the BL value of the product. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying 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 accompanying drawings can be obtained based on the structures shown in these drawings.

[0036] Figure 1 Structural schematic diagram of an embodiment of the sound generating device provided by the present invention;

[0037] Figure 2 Top view structural schematic diagram of an embodiment of the sound generating device provided by the present invention;

[0038] Figure 3 Exploded schematic diagram of an embodiment of the sound generating device provided by the present invention;

[0039] Figure 4 Cross-sectional schematic diagram of an embodiment of the sound generating device provided by the present invention;

[0040] Figure 5 For Figure 4 Enlarged schematic diagram at position A in;

[0041] Figure 6 Structural schematic diagram of the diaphragm in an embodiment of the sound generating device provided by the present invention;

[0042] Figure 7 Cross-sectional schematic diagram of the diaphragm in an embodiment of the sound generating device provided by the present invention;

[0043] Figure 8 Structural schematic diagram of the first yoke in an embodiment of the sound generating device provided by the present invention;

[0044] Figure 9 Structural schematic diagram of the first yoke in another embodiment of the sound generating device provided by the present invention;

[0045] Figure 10 Structural schematic diagram of an embodiment of the sound generating module provided by the present invention;

[0046] Figure 11 Structural schematic diagram of another embodiment of the sound generating module provided by the present invention;

[0047] Figure 12 Cross-sectional schematic diagram of another embodiment of the sound generating module provided by the present invention;

[0048] Figure 13 Schematic diagram of the simulation effect of an embodiment of the sound generating device provided by the present invention.

[0049] Explanation of the reference numerals in the drawings:

[0050] 100, Sound generating device; 1, housing; 11, first cavity; 2, vibration system; 21, diaphragm assembly; 211, diaphragm; 212, vibrating plate; 2121, first plate portion; 2122, stepped portion; 2123, second plate portion; 2124, third plate portion; 2125, accommodating groove; 22, voice coil; 3, magnetic circuit system; 31, first yoke; 311, top plate portion; 312, side plate portion; 313, support platform; 314, sound outlet hole; 315, first welding portion; 32, second yoke; 321, second concave groove; 33, central magnetic portion; 331, first central magnet; 332, second central magnet; 34, edge magnetic portion; 341, edge magnet; 342, edge magnetic conductive plate; 35, magnetic gap; 400, module housing; 410, sound outlet; 420, rear cavity; 500, sound generating module.

[0051] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed embodiments

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to 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 making creative efforts shall fall within the protection scope of the present invention.

[0053] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0054] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously.

[0055] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill 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 protection scope required by the present invention.

[0056] 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.

[0057] Please refer to Figures 1 to 9 As shown, in an 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, a second plate portion 2123, and a third plate portion 2124 that are integrally provided. The first plate portion 2121 and the second plate portion 2123 are 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 third plate portion 2124 is attached to the inner peripheral wall of the voice coil 22, and both ends of the third plate portion 2124 along the first direction are respectively connected to the first plate portion 2121 and the second plate portion 2123. 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 is spaced from the central magnetic portion 33 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 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. One 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. Wherein, both the first central magnet 331 and the second central magnet 332 are magnetized along the first direction and the magnetization directions are opposite.

[0058] In this embodiment, the sound generating device 100 can be a 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.

[0059] 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 used 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.

[0060] 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 specifically designed according to actual needs and will not be limited herein. In this embodiment, the housing 1 can be optionally a frame or a framework structure, that is, the housing 1 has a cavity with two open 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 will not be limited herein.

[0061] Optionally, the housing 1 can be an integral structure or formed by a plurality of split structures in cooperation, which will not be 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 realize the electrical connection and conduction between the voice coil 22 and the external circuit through the conductive terminals.

[0062] 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.

[0063] In this embodiment, as Figures 3 to 7 shown, by setting the vibration plate 212 as an integrally formed structure, that is, the first plate part 2121, the third plate part 2124 and the second plate part 2123 of the vibration plate 212 are integrally formed structures, which can not only improve the structural strength of the vibration plate 212, but also improve the sealing performance. Optionally, the first plate part 2121, the third plate part 2124 and the second plate part 2123 of the vibration plate 212 can be integrally stamped.

[0064] It can be understood that the third plate part 2124 extends in the first direction, and the third plate part 2124 is located inside the voice coil 22 and is attached to and connected to the inner peripheral wall of the voice coil 22, so that the first plate part 2121 and the second plate part 2123 of the vibration plate 212 are connected to both ends of the third plate part 2124 in the first direction, which can not only realize the connection and fixation of the first plate part 2121 and the second plate part 2123, but also further improve the connection stability and strength between the vibration plate 212 and the voice coil 22 by using the first plate part 2121 and the third plate part 2124.

[0065] 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.

[0066] It can be understood that in order to prevent the second plate portion 2123 from vibrating between the first central magnet 331 and the second central magnet 332 during the vibration of the voice coil 22 and to prevent the second plate portion 2123 from colliding and interfering with the first central magnet 331 and the second central magnet 332, 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.

[0067] In this embodiment, by arranging the first central magnet 331 and the second central magnet 332 on opposite sides of the second plate portion 2123, and the projections of the first central magnet 331 and the second central magnet 332 along the first direction are located inside the voice coil 22. Thus, when the voice coil 22 drives the diaphragm assembly 21 to vibrate, the second plate portion 2123 vibrates between the first central magnet 331 and the second central magnet 332. At this time, the voice coil 22 cooperates with the third plate portion 2124 and the second plate portion 2123 to accommodate the first central magnet 331 and the second central magnet 332, and enables the voice coil 22 to be affected by the magnetic field of the first central magnet 331 when approaching the first central magnet 331, and the voice coil 22 to be 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, thereby increasing 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.

[0068] 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 the sides of 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 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 conductive 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 13 shown; and, on the premise that the thickness of the sound generating device is constant, the central magnetic part 33 of the present invention cancels the central washer (or central magnetic conductive 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, improve the BL value, and the first central magnet 331 and the second central magnet 332 are arranged on opposite sides of the second plate part 2123, such that the voice coil 22 approaches the first central magnet 331 and the second central magnet 332 respectively during the vibration process, making the distribution of the magnetic force lines more uniform and the BLx curve flatter, thereby reducing distortion.

[0069] Optionally, the voice coil 22 is an annular voice coil and extends along the first direction. In this way, the vibrating plate 212 is set as an integrally formed first plate part 2121, a third plate part 2124, and a second plate part 2123, and the first plate part 2121 and the second plate part 2123 are arranged at different horizontal planes along the first direction, such that the third plate part 2124 extends along the first direction. Thus, the third plate part 2124 is used to connect and fix the first plate part 2121 and the second plate part 2123, and the top of the voice coil 22 is connected to the first plate part 2121, that is, the first plate part 2121 is used to fix the voice coil 22. The third plate part 2124 is attached to and connected with the inner peripheral wall of the voice coil 22. The second plate part 2123 is located inside the voice coil 22, and the outer periphery of the second plate part 2123 abuts against the inner peripheral wall of the voice coil 22. Thus, the first plate part 2121 and the second plate part 2123 at different horizontal planes cooperate with the third plate part 2124 to center the vibration of the voice coil 22. At the same time, during the vibration process of the voice coil 22, the cooperation of the voice coil 22 with the third plate part 2124 and the second plate part 2123 provides a receiving space for the first central magnet 331, ensuring the normal operation of the sound generating device 100.

[0070] It should be noted that the accommodating groove 2125 not only provides an accommodating space for the first central magnet 331, but also can prevent vibrations from propagating along the surface of the diaphragm 211, thereby improving the acoustic performance of the sound generating device 100.

[0071] 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. The side magnetic portions 34 are 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. One end of the voice coil 22 is suspended in the magnetic gap 35. By passing an electric current into the voice coil 22, the voice coil 22 reciprocates in the magnetic field formed by the magnetic circuit system 3, driving the diaphragm assembly 21 to move in the first direction, and then pushing the air to generate sound. At the same time, the central magnetic portion 33 of the magnetic circuit system 3 is provided with a first central magnet 331 and a second central magnet 332 that are opposite and spaced apart in the first direction. The inner periphery of the diaphragm 211 of the diaphragm assembly 21 is connected to a vibration plate 212. The vibration plate 212 is provided with a first plate portion 2121, a second plate portion 2123, and a third plate portion 2124 that are integrally formed. 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, thereby improving the waterproof and sealing effect of the vibration plate 212. The voice coil 22 is provided as an annular voice coil and extends in the first direction. The top of the voice coil 22 is connected to the first plate portion 2121, and the third plate portion 2124 is in fitting connection with the inner peripheral wall of the voice coil 22. The second plate portion 2123 is located inside the voice coil 22, and the outer periphery of the second plate portion 2123 abuts against the inner peripheral wall of the voice coil 22. The first central magnet 331 and the second central magnet 332 are respectively provided on opposite sides of the second plate portion 2123, such that 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 in 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. Thus, the cooperation between the first central magnet 331 and 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 are located inside the voice coil 22. Thus, during the movement of the diaphragm assembly 21, the cooperation between the voice coil 22 and the third plate portion 2124 and the second plate portion 2123 respectively provides 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 when the voice coil 22 reciprocates, the magnetic force is insufficient when the voice coil 22 is away from the magnetic gap 35, which affects 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, so as to improve the BL value of the product.;

[0072] In one embodiment, as Figures 3 to 7 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.

[0073] In this embodiment, by recessing and bending the outer periphery of the first plate portion 2121 to form the stepped portion 2122, the inner peripheral edge of the diaphragm 211 is fixed by using the stepped portion 2122, and the inner peripheral edge of the diaphragm 211 is positioned and limited. At the same time, when the inner peripheral edge of the diaphragm 211 is supported and lapped on the stepped portion 2122, the inner peripheral edge of the diaphragm 211 can be 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.

[0074] It can be understood that the stepped portion 2122 is formed by recessing and bending the outer periphery of the first plate portion 2121 towards the voice coil 22. Thus, the stepped portion 2122 and the inner peripheral edge of the first plate portion 2121 form a limiting groove, and cooperate with the third plate portion 2124 to limit and install the top of the voice coil 22, thereby further improving the connection stability of the voice coil 22.

[0075] 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.

[0076] In this embodiment, as Figure 4 shown, the second plate portion 2123 has a first surface facing one side of the first central magnet 331 and a second surface facing one side of 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 in 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 in a direction perpendicular to the first direction is located in the middle of the voice coil 22.

[0077] In an embodiment, the magnetic circuit system 3 further includes a first magnetic yoke 31 and a second magnetic yoke 32 which are oppositely arranged. One side of the first central magnet 331 facing away from the diaphragm assembly 21 is connected to the first magnetic yoke 31, and one 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.

[0078] In this embodiment, as Figures 1 to 4 、 Figure 8 、 Figure 9 shown, by providing the first magnetic yoke 31 and the second magnetic yoke 32 such that the first magnetic yoke 31 and the second magnetic yoke 32 are oppositely arranged, the first magnetic yoke 31 and the second magnetic yoke 32 can be used to respectively mount and fix the first central magnet 331 and the second central magnet 332, and at the same time, the magnetic field lines of the first central magnet 331 and the second central magnet 332 can be concentrated to form a magnetic circuit.

[0079] 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 magnetic yoke 31, and one side of the second central magnet 332 facing away from the diaphragm assembly 21 is connected to the second magnetic yoke 32. Optionally, the projected area of the first magnetic yoke 31 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 magnetic 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 field concentrating effect is achieved. In this embodiment, the first magnetic yoke 31 and the second magnetic yoke 32 can be selected as a magnetic conductive plate structure.

[0080] In an embodiment, the first magnetic 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 mount the first central magnet 331, improve the mounting stability, and also reduce the assembly height between the first central magnet 331 and the first magnetic yoke 31, increasing the vibration space of the diaphragm assembly 21.

[0081] In this embodiment, the first recessed groove may be formed by the depression of one side of the first yoke 31 facing the first central magnet 331. At this time, the side of the first yoke 31 facing away from the first central magnet 331 is planar; alternatively, the first recessed groove may be formed by bending the first yoke 31 toward the side away from the first central magnet 331. At this time, the position of the side of the first yoke 31 facing away from the first central magnet 331 corresponding to the first recessed groove is convexly provided, which is not limited herein.

[0082] In one embodiment, as Figure 3 , Figure 4 shown, the second yoke 32 is provided with a second recessed groove 321 corresponding to the second central magnet 332, and the second central magnet 332 is disposed in the second recessed groove 321. It can be understood that such a setting can utilize the second recessed groove 321 to achieve positioning and installation of the second central magnet 332, improving the installation stability. Moreover, the assembly height between the second central magnet 332 and the second yoke 32 can be reduced, increasing the vibration space of the diaphragm assembly 21.

[0083] In this embodiment, the second recessed groove 321 may be formed by the depression of 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 planar; alternatively, the second recessed groove 321 may be formed by bending the second yoke 32 toward the side away from the second central magnet 332. At this time, the position of the side of the second yoke 32 facing away from the second central magnet 332 corresponding to the second recessed groove 321 is convexly provided, which is not limited herein.

[0084] In one embodiment, the magnetic circuit system 3 further includes a side magnetic portion 34 disposed on the second yoke 32. The side magnetic portion 34 is located outside the second central magnet 332 and is spaced apart from the second central magnet 332 to form a magnetic gap 35.

[0085] In this embodiment, as Figures 3 to 5 shown, by disposing the side magnetic portion 34 on the second yoke 32 and located outside the second central magnet 332, the side magnetic portion 34 is spaced apart 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.

[0086] It can be understood that the side magnetic portion 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. At the same time, the side magnetic portion 34 also forms a magnetic circuit with the first central magnet 331 and the first yoke 31. When the voice coil 22 is close to 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.

[0087] It should be noted that the side magnetic part 34 can be an integral structure. For example, the side magnetic part 34 is arranged in a ring shape and is disposed around the outside of the second central magnet 332. Of course, the side magnetic part 34 can also be a split structure. In this case, the side magnetic part 34 includes a plurality of parts, and the plurality of side magnetic parts 34 are spaced apart and disposed around the outside of the second central magnet 332, which is not limited herein.

[0088] In an embodiment, the side magnetic part 34 includes a side magnet 341 and a side magnetic conduction plate 342 arranged in a stacked manner. The side magnet 341 is located outside the second central magnet 332 and is spaced apart from the second central magnet 332 to form a magnetic gap 35.

[0089] In this embodiment, as Figures 3 to 5 shown, the side magnetic part 34 includes a side magnet 341 and a side magnetic conduction plate 342 arranged in a stacked manner. The side magnet 341 is connected to the second magnetic yoke 32. It can be understood that both the side magnet 341 and the side magnetic conduction plate 342 are located outside the second central magnet 332 and are spaced apart from the second central magnet 332 to form a magnetic gap 35.

[0090] Optionally, the structural profiles of the side magnet 341 and the side magnetic conduction plate 342 of the side magnetic part 34 are similar. That is, when the side magnetic part 34 is an integral ring structure, both the side magnet 341 and the side magnetic conduction plate 342 are in an integral ring structure; or, when the side magnetic part 34 is a split structure, both the side magnet 341 and the side magnetic conduction plate 342 are split structures and correspond one by one. Of course, in other embodiments, the structures of the side magnet 341 and the side magnetic conduction plate 342 of the side magnetic part 34 can also be different. For example, one of the side magnet 341 and the side magnetic conduction plate 342 is an integral ring, and the other is a split structure, which is not limited herein.

[0091] In an embodiment, the projection of the side magnetic conduction plate 342 along a direction perpendicular to the first direction is located between the top and the bottom of the voice coil 22.

[0092] 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 side magnetic conduction 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 moving 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.

[0093] It should be noted that when the voice coil 22 is in a small amplitude, the projection of the side magnetic guide plate 342 along the direction perpendicular to the first direction is located between the top and the bottom of the voice coil 22. For the voice coil 22 in a small amplitude, only when the voice coil 22 does not vibrate, the projection of the side magnetic guide plate 342 along the direction perpendicular to the first direction is located between the top and the bottom of the voice coil 22, and no limitation is made here.

[0094] In one embodiment, the projection of the side magnetic guide plate 342 along the 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.

[0095] In this embodiment, as Figure 4 shown, by setting the projection of the side magnetic guide plate 342 of the side magnetic part 34 along the 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 side 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 force lines pass through the voice coil 22, thereby increasing the magnetic field strength, effectively improving the BL value, making the distribution of magnetic force lines more uniform, and making the BLx curve flatter, thereby reducing distortion.

[0096] Optionally, the thickness of the side magnet 341 along the first direction is greater than the thickness of the second central magnet 332 along the first direction. In this embodiment, by setting the thickness of the side magnet 341 along the first direction to be greater than the thickness of the second central magnet 332 along the first direction, on the one hand, it is ensured that the projection of the side magnetic guide plate 342 along the 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. 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, and the above settings can also ensure that the side magnet 341 forms magnetic circuits with the first central magnet 331 and the second central magnet 332 with comparable magnetic field strengths.

[0097] Of course, in other embodiments, the second magnetic yoke 32 includes a bottom and a side portion (not shown in the figure) bent and extended from the periphery of the bottom toward the diaphragm assembly 21. The second central magnet 332 is disposed on the bottom and is spaced 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 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 from the second central magnet 332 to form a magnetic gap 35. The bottom and the side portion of the second magnetic yoke 32 can be an integrally formed structure, and the bottom and the side portion are perpendicularly arranged, and no limitation is made here.

[0098] In one embodiment, as Figure 1 、 Figure 3 、Figure 4 , Figure 8 and Figure 9 As shown in Figure 4 , Figure 8 and Figure 9 , the outer periphery of the first magnetic yoke 31 bends and extends towards 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. Thus, 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.

[0099] Optionally, there are a plurality of first welding portions 315, and the plurality of first welding portions 315 are spaced apart on the outer periphery of the first magnetic yoke 31, and the plurality of first welding portions 315 are all welded to the outer periphery of the second magnetic yoke 32, and no limitation is made here.

[0100] In this embodiment, as shown in Figure 1 , Figure 3 , Figure 4 , Figure 8 and Figure 9 , the first magnetic 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 towards the second magnetic yoke 32 to form the first welding portion 315. Optionally, the top plate portion 311, the side plate portion 312 and the first welding portion 315 of the first magnetic yoke 31 are of an integrally formed structure, and no limitation is made here.

[0101] In an embodiment, the outer periphery of the second magnetic yoke 32 bends and extends towards the first magnetic yoke 31 to form a second welding portion, and the second welding portion is welded to the outer periphery of the first magnetic yoke 31. It can be understood that by welding the second welding portion of the second magnetic yoke 32 to the first magnetic yoke 31, the connection stability is improved. Thus, when the sound generating device 100 is applied to an electronic device and phenomena such as dropping occur, the structure of the sound generating device 100 can be ensured to be stable.

[0102] Optionally, there are a plurality of second welding portions, and the plurality of second welding portions are spaced apart on the outer periphery of the second magnetic yoke 32, and the plurality of second welding portions are all welded to the outer periphery of the first magnetic yoke 31, and no limitation is made here.

[0103] In this embodiment, the second magnetic yoke 32 includes a top wall and a side wall arranged at an angle, and a part of the side wall extends towards the first magnetic yoke 31 to form the second welding portion. Optionally, the top wall, the side wall and the second welding portion of the second magnetic yoke 32 are of an integrally formed structure, and no limitation is made here.

[0104] ​​​​​​​​​​In one embodiment, the sound generating device 100 further includes a housing 1. The housing 1 is respectively connected to the first magnetic yoke 31 and the second magnetic yoke 32, and is located between the first magnetic yoke 31 and the second magnetic yoke 32. The first magnetic yoke 31 at least includes a top plate portion 311 located on the side of the diaphragm assembly 21 facing away from the second magnetic yoke 32. The first central magnet 331 is disposed 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 magnetic yoke 32, and the diaphragm 211 is opposite to and spaced from the top plate portion 311.

[0105] In this embodiment, as Figures 1 to 4 shown, by providing the housing 1, the magnetic circuit system 3 and the vibration system 2 can be mounted and fixed by using the housing 1. It can be understood that the housing 1 is located between the first magnetic yoke 31 and the second magnetic yoke 32 in the first direction. The first magnetic yoke 31 is connected to the housing 1, and the second magnetic yoke 32 can be connected to the housing 1 directly or indirectly, which is not limited herein.

[0106] It can be understood that the first magnetic yoke 31 at least includes a top plate portion 311 located on the side of the diaphragm assembly 21 facing away from the second magnetic yoke 32, so that the first central magnet 331 can be mounted and fixed by using the top plate portion 311. In this way, the outer peripheral edge of the diaphragm 211 is connected to one end of the housing 1 away from the second magnetic yoke 32, so that the diaphragm 211 is opposite to and spaced from the top plate portion 311, and thus the vibration of the diaphragm 211 can be ensured.

[0107] In this embodiment, the first magnetic yoke 31 can be a flat plate structure. At this time, the first magnetic yoke 31 is formed as the top plate portion 311, and the first magnetic yoke 31 and the housing 1 can be an integrally formed structure. Optionally, the housing 1 is a plastic housing, and the housing 1 and the first magnetic yoke 31 are integrally injection molded. Of course, in other embodiments, the first magnetic yoke 31 and the housing 1 can also be connected by welding or bonding, which is not limited herein.

[0108] It can be understood that the housing 1 can be a frame structure or a framework with openings at both ends. At this time, the first magnetic yoke 31 is connected to one end of the housing 1, and the second magnetic yoke 32 is located at the end of the housing 1 away from the first magnetic yoke 31. Of course, in other embodiments, the housing 1 includes a flat portion and a vertical portion arranged at an angle, the flat portion is provided with an installation opening, the first magnetic yoke 31 is disposed at the installation opening, and the second magnetic 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.

[0109] In one embodiment, the first magnetic 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. The outer peripheral edge of the diaphragm 211 is clamped between the housing 1 and the support platform 313.

[0110] In this embodiment, as Figure 1 、 Figure 3 、 Figure 4, Figure 8 and Figure 9 As shown in Figure 8 and Figure 9 , by setting the first yoke 31 to have a top plate portion 311 and a side plate portion 312 arranged at an included angle, and providing a support platform 313 on the side plate portion 312, the support platform 313 can be used to both position and install the outer shell 1, and the outer periphery of the diaphragm 211 can be fixed by the outer shell 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.

[0111] It can be understood that the side plate portion 312 of the first yoke 31 and the outer shell 1 can be integrally formed. For example, the outer shell 1 is a plastic housing, and the outer shell 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 outer shell 1 can be connected by welding or bonding, which is not limited herein.

[0112] Of course, in other embodiments, the outer periphery of the diaphragm 211 can also be fixed to the inner wall of the outer shell 1. For example, the inner wall of the outer shell 1 is provided with a support platform or other structures, and the outer periphery of the diaphragm 211 is fixed to the support platform or other structures, which is not limited herein.

[0113] In one embodiment, the edge magnetic portion 34 includes a stacked edge magnet 341 and an edge magnetic plate 342. The edge magnet 341 is connected to the second yoke 32, and the edge magnetic plate 342 is connected to the outer shell 1; wherein, the edge magnetic plate 342 and the outer shell 1 are an integrally formed structure.

[0114] In this embodiment, as shown in Figure 3 and Figure 4 , the edge magnetic portion 34 of the magnetic circuit system 3 is disposed on the second yoke 32, and the second yoke 32 can be connected to the outer shell 1 through the edge magnetic portion 34. Optionally, the edge magnetic plate 342 of the edge magnetic portion 34 and the outer shell 1 can be an integrally formed structure. For example, the outer shell 1 is a plastic housing, and the outer shell 1 and the edge magnetic plate 342 are integrally injection-molded; or, the outer shell 1 is a metal housing, and in this case, the outer shell 1 and the edge magnetic plate 342 are integrally drawn, which is not limited herein. Of course, in other embodiments, the outer shell 1 and the edge magnetic plate 342 can also be connected by welding or bonding, which is not limited herein.

[0115] It should be noted that the outer shell 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 yoke 31 and the second yoke 32 of the magnetic circuit system 3, so that the first yoke 31 and the second yoke 32 are relatively and spaced apart.

[0116] In one embodiment, a first cavity 11 is formed between the first 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. ​​​​

[0117] In this embodiment, as Figure 4 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 emit sound smoothly during vibration, the sound emitting device 100 is also provided with a sound outlet hole 314 communicating with the first cavity 11.

[0118] It can be understood that the sound outlet hole 314 is provided on the housing 1; or, the sound outlet hole 314 is provided on the first magnetic yoke 31; or, the sound outlet hole 314 is provided at the connection between the housing 1 and the first magnetic yoke 31, which is not limited herein.

[0119] In one embodiment, the first magnetic yoke 31 includes a top plate portion 311 and a side plate portion 312 arranged at an angle; wherein, the sound outlet hole 314 is provided on the top plate portion 311 and is opposite to the diaphragm 211; or, the sound outlet hole 314 is provided on the side plate portion 312.

[0120] It can be understood that when the sound outlet hole 314 of the sound emitting device 100 is provided on the top plate portion 311 and is opposite to the diaphragm 211, when the sound emitting device 100 is applied to an electronic device or a sound emitting module, a sound outlet is provided on the housing of the electronic device or the sound emitting module and is directly opposite to the sound outlet hole 314. In this way, the electronic device or the sound emitting module can have a front sound emitting structure. Or, the sound outlet on the housing of the electronic device or the sound emitting module is located on one side of the sound emitting 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 emitting module have a side sound emitting structure.

[0121] Of course, in other embodiments, when the sound outlet hole 314 of the sound emitting device 100 is provided on the side plate portion 312, when the sound emitting device 100 is applied to an electronic device or a sound emitting module, when the sound outlet on the housing of the electronic device or the sound emitting module is directly opposite to the diaphragm 211 of the sound emitting device 100, the sound outlet is communicated with the sound outlet hole 314 through a sound outlet channel. In this way, the electronic device or the sound emitting module can have a front sound emitting structure. Or, the sound outlet on the housing of the electronic device or the sound emitting module is located on one side of the sound emitting device 100, and the sound outlet is correspondingly communicated with the sound outlet hole 314, thereby making the electronic device or the sound emitting module have a side sound emitting structure.

[0122] In one embodiment, 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; wherein, 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 with such a setting, it can be ensured that the magnetic field intensity of the first central magnet 331 is greater than that of the second central magnet 332.

[0123] In this embodiment, the side magnetic part 34 is located outside the second central magnet 332, such that the magnetic field strength within the magnetic gap 34 formed by the cooperation of the side magnetic part 34 and the second central magnet 332 is greater than the magnetic field strength 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 strengths at both ends of the voice coil 22 can be balanced, the flatness of the BLx curve can be further improved, and thus distortion can be reduced.

[0124] Optionally, the volume of the first central magnet 331 is greater than the volume of the second central magnet 332. When the grades of the first central magnet 331 and the second central magnet 332 are the same, this can ensure that the magnetic field strength of the first central magnet 331 is greater than that of the second central magnet 332. In this embodiment, as Figure 3 , Figure 4 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 the thickness of the second central magnet 332 in the first direction. Thus, the magnetic field strength of the first central magnet 331 is greater than that of the second central magnet 332.

[0125] As Figures 10 to 12 shown, the present invention further provides a sound generating module 500, which includes the above-mentioned sound generating device 100. For the specific structure of the sound generating device 100, reference may be made to the foregoing embodiments. Since this electronic device adopts all the technical solutions of the foregoing embodiments, it has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, and will not be elaborated herein one by one.

[0126] In one embodiment, the sound generating module 500 further includes a module housing 400. The module housing 400 is provided with a receiving cavity, and the sound generating device 100 is disposed in the receiving cavity and divides the receiving 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.

[0127] 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, and the module upper shell and the module lower shell are butt-joined and enclose to form the receiving cavity. Optionally, the module upper shell and the module lower shell can be adhesively connected or welded.

[0128] Optionally, the outer contour of the module housing 400 can be a square structure. In specific applications, other suitable shapes such as a circle can be selected according to actual situations, and it is not limited to a specific shape.

[0129] In this embodiment, the sound generating device 100 is disposed in the accommodating cavity, and the accommodating cavity is partitioned 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.

[0130] In an 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 the sound leakage holes can be one or more, which is specifically designed according to actual applications and is not limited herein.

[0131] 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 disposed opposite to each other 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. The present invention is not limited herein.

[0132] In this embodiment, as Figures 10 to 12 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.

[0133] In an embodiment, as Figure 11 and Figure 12 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.

[0134] Optionally, the sound outlet 410 is disposed opposite to and communicated with the sound outlet hole 314 of the sound generating device 100; or, the sound outlet 410 is communicated with the sound outlet hole 314 of the sound generating device 100 through a sound outlet channel, which is not limited herein.

[0135] In one embodiment, as Figure 10 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 directly opposite to the diaphragm assembly 21 of the sound generating device 100, but is located on one side of the periphery of the diaphragm assembly 21. At this time, the sound generating module 500 has a side sound output structure.

[0136] Optionally, the sound outlet 410 is arranged to be directly opposite and communicated with the sound outlet hole 314 of the sound generating device 100; or, the sound outlet 410 is communicated with the sound outlet hole 314 of the sound generating device 100 through a sound outlet channel, which is not limited herein.

[0137] 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 has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0138] 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 has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0139] 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.

[0140] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations 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 are 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 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 portion, a second plate portion, and a third plate portion that are integrally provided. The first plate portion and the second plate portion are 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 portion. The second plate portion is located inside the voice coil, and the outer periphery of the second plate portion abuts against the inner peripheral wall of the voice coil. The third plate portion is attached to the inner peripheral wall of the voice coil, and both ends of the third plate portion in the first direction are respectively connected to the first plate portion and the second plate portion; and a magnetic circuit system that includes a central magnetic portion and a side magnetic portion provided outside the central magnetic portion. The side magnetic portion and the central magnetic portion are spaced apart to form a magnetic gap. One end of the voice coil away from the first plate portion is suspended in the magnetic gap. The central magnetic portion includes a first central magnet and a second central magnet that are opposite and spaced apart along the first direction. The first central magnet and the second central magnet are located on opposite sides of the second plate portion and are located inside the voice coil in the projection along the first direction. One 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; wherein, both the first central magnet and the second central magnet are magnetized along the first direction and the magnetization directions are opposite to each other.

2. The sound generating device according to claim 1, wherein, The extension length of the third plate portion in the first direction is less than the extension length of the voice coil in the first direction; and / or, 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; and / or, the distance from one side of the second plate portion facing the first central magnet to the first central magnet is the same as the distance from one side of the second plate portion facing the second central magnet to the second central magnet.

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

4. The sound generating device according to claim 3, wherein The outer periphery of the first magnetic yoke is bent and extended towards the second magnetic yoke to form a first welding portion, and the first welding portion is welded to the outer periphery of the second magnetic yoke; and / or, the outer periphery of the second magnetic yoke is bent and extended towards the first magnetic yoke to form a second welding portion, and the second welding portion is welded to the outer periphery of the first magnetic yoke.

5. The sound generating device according to claim 3, wherein The sound generating device further includes a housing, which is respectively connected to the first magnetic yoke and the second magnetic yoke and is located between the first magnetic yoke and the second magnetic yoke. The first magnetic yoke at least includes a top plate portion located on the side of the diaphragm assembly facing away from the second magnetic yoke. The first central magnet is disposed on the top plate portion. The outer peripheral edge of the diaphragm is connected to one end of the housing away from the second magnetic yoke, and the diaphragm is opposite to and spaced from the top plate portion.

6. The sound generating device according to claim 5, wherein The first magnetic yoke further includes a side plate portion disposed at an angle with the top plate portion. The side plate portion is bent toward the side of the diaphragm assembly to form a support platform. 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 magnetic yoke are integrally injection molded.

7. The sound generating device according to claim 5, wherein The edge magnetic portion includes a side magnet and a side magnetic conductive plate stacked. The side magnet is connected to the second magnetic yoke, and the side magnetic conductive plate is connected to the housing. Wherein, the side magnetic conductive plate and the housing are an integrally formed structure.

8. The sound generating device according to claim 5, wherein A first cavity is formed between the first magnetic 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 communicating with the first cavity. Wherein, the sound outlet is disposed on the housing. Or, the first magnetic yoke includes a top plate portion and a side plate portion disposed at an angle; wherein, the sound outlet is disposed on the top plate portion and is opposite to the diaphragm; or, the sound outlet is disposed on the side plate portion. Or, the sound outlet is disposed at the connection portion between the housing and the first magnetic yoke.

9. The sound generating device according to claim 1, wherein, The edge magnetic portion includes a side magnet and a side magnetic conductive plate stacked. The side 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 side 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 side 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 side magnet in the first direction is greater than the thickness of the second central magnet in the first direction.

10. A sound generating module, characterized in that, The sound generating module includes: A module housing, which is provided with a receiving cavity; and The sound generating device according to any one of claims 1 to 9, the sound generating device is disposed in the receiving cavity and divides the receiving cavity into a front cavity and a rear cavity; Wherein, the module housing is provided with a sound outlet communicating with the front cavity.

11. The sound generating module according to claim 10, 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.

12. An electronic device, characterized in that, The electronic device includes the sound generating module according to claim 10 or 11; Or, the electronic device includes the sound generating device according to any one of claims 1 to 9.

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