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 arranged in a split mode and located on different horizontal planes; the waterproof film comprises a first connecting part located at the top of the voice coil, a second connecting part in attached connection with the inner circumferential wall of the voice coil and a third connecting part located in the voice coil, the first plate part is connected with the first connecting part, and the second plate part is connected with the third connecting part; 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 a second plate part, the first center magnet and the second center magnet are magnetized in the first direction, and the magnetizing directions are opposite. 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, the 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 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, thus 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 force lines are concentrated near the central spacer. Under large displacement, 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 displacement 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 thinning design, but also effectively increase the volume of the magnet, improve the BL value of the product, make the distribution of magnetic force lines more uniform, and the BLx curve more flat, thereby reducing distortion.

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

[0006] A vibration system, the vibration system vibrating along a first direction, the vibration system including a diaphragm assembly, a voice coil, and a waterproof film, the diaphragm assembly including a diaphragm and a vibration plate, an inner periphery of the diaphragm being connected to the vibration plate, the vibration plate including a first plate portion and a second plate portion that are separately arranged, the first plate portion and the second plate portion being located at different horizontal planes, the voice coil being an annular voice coil and extending along 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 being abutted against an inner peripheral wall of the voice coil, 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; and

[0007] A magnetic circuit system, the magnetic circuit system including a central magnetic portion and a peripheral magnetic portion provided outside the central magnetic portion, the peripheral magnetic portion and the central magnetic portion being spaced apart 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 along 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 along 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;

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

[0009] In an embodiment, the first connection portion is clamped between the first plate portion and the top of the voice coil;

[0010] And / or, the first connection portion, the second connection portion, and the third connection portion are of an integrally formed structure;

[0011] And / or, an extension length of the second connection portion along the first direction is less than an extension length of the voice coil along the first direction;

[0012] And / or, the first connection portion and the third connection portion are respectively connected to two ends of the second connection portion along the first direction, and the second plate portion is provided on a side of the third connection portion facing the first central magnet.

[0013] In an embodiment, an outer periphery of the first plate portion is recessed and bent towards the voice coil to form a stepped portion, and an inner periphery of the diaphragm is supported and lapped on the stepped portion;

[0014] 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.

[0015] In one embodiment, the magnetic circuit system further includes a first magnetic yoke and a second magnetic yoke which 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 edge magnetic portion are both connected to the second magnetic yoke.

[0016] In one embodiment, the outer periphery of the first magnetic yoke bends and extends towards the second magnetic yoke to form a first welding portion, and the first welding portion is welded and connected to the outer periphery of the second magnetic yoke;

[0017] And / or, the outer periphery of the second magnetic yoke bends and extends towards the first magnetic yoke to form a second welding portion, and the second welding portion is welded and connected to the outer periphery of the first magnetic yoke.

[0018] In one embodiment, 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 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 magnetic yoke, and the diaphragm is opposite to and spaced from the top plate portion.

[0019] In one embodiment, the first magnetic yoke further includes a side plate portion arranged at an angle with the top plate portion. The side of the side plate portion facing the diaphragm assembly bends to form a support platform, and the outer peripheral edge of the diaphragm is clamped between the housing and the support platform;

[0020] And / or, the housing is a plastic housing, and the housing and the first magnetic yoke are integrally injection molded.

[0021] 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 magnetic yoke, and the edge magnetic conductive plate is connected to the housing;

[0022] Wherein, the edge magnetic conductive plate and the housing are an integrally formed structure.

[0023] In one embodiment, a first cavity is formed between the first magnetic yoke and the diaphragm assembly. The first central magnet is located in the first cavity, and the sound generating device is further provided with a sound outlet hole communicating with the first cavity;

[0024] Wherein, the sound outlet hole is arranged on the housing;

[0025] Alternatively, 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 faces the diaphragm; or, the sound outlet hole is disposed on the side plate portion;

[0026] Or, the sound outlet hole is disposed at the connection between the housing and the first yoke.

[0027] In an embodiment, the edge magnetic portion includes an edge magnet and an edge magnetic plate stacked, the edge magnet is located outside the second central magnet and is spaced from the second central magnet to form the magnetic gap;

[0028] Wherein, the projection of the edge magnetic 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 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.

[0029] The present invention further provides a sound generating module, the sound generating module includes:

[0030] A module housing, the module housing is provided with a receiving cavity; and

[0031] The above-mentioned sound generating device, the sound generating device is disposed in the receiving cavity and divides the receiving cavity into a front cavity and a rear cavity;

[0032] Wherein, the module housing is provided with a sound outlet communicating with the front cavity.

[0033] In an embodiment, 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;

[0034] And / or, the module housing is further provided with a sound leakage hole communicating with the rear cavity.

[0035] The present invention further provides an electronic device, characterized in that the electronic device includes the above-mentioned sound generating module;

[0036] Or, the electronic device includes the above-mentioned sound generating device.

[0037] 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 from the central magnetic part to form a magnetic gap, and sets the vibration system as a diaphragm assembly, a voice coil and a waterproof film, 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 makes a reciprocating motion in the magnetic field formed by the magnetic circuit system, drives the diaphragm assembly to move along a 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 along the first direction. 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 along 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. At the same time, the waterproof film is set as a first connecting part located at the top of the voice coil, a second connecting part that is attached and connected to the inner peripheral wall of the voice coil, and a third connecting part located inside the voice coil. Thus, the first plate part is connected to the first connecting part, and the second plate part is connected to the third connecting part, which can not only use the waterproof film to connect and fix the first plate part and the second plate part, but also achieve the waterproof and sealing effect. The first central magnet and the second central magnet are respectively arranged on opposite sides of the second plate part, and the projections of the first central magnet and the second central magnet along the first direction are located inside the voice coil. 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, and the first central magnet and the second central magnet are magnetized along the first direction and the magnetization directions are opposite. Thus, the first central magnet and the second central magnet cooperate with the side magnetic parts 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 waterproof film and the first plate part and the second plate part of the vibration plate located at different horizontal planes along the first direction, and the projections of the first central magnet and the second central magnet along 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 waterproof film and the second plate part of the vibration plate respectively provides a receiving space 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 the magnetic field enhancement effect. Thus, it can effectively solve the problem that the magnetic force is insufficient when the voice coil is far from the magnetic gap during the reciprocating movement of the voice coil, which affects the acoustic performance. The first central magnet and the second central magnet cancel the structure of the conventional central washer, which can not only achieve a thinning design, make the magnetic flux distribution more uniform, and make 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, thereby improving the BL value of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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.

[0039] Figure 1 Schematic structural diagram of an embodiment of the sound generating device provided by the present invention;

[0040] Figure 2 Top view structural diagram of an embodiment of the sound generating device provided by the present invention;

[0041] Figure 3 Exploded view of an embodiment of the sound generating device provided by the present invention;

[0042] Figure 4 Cross-sectional view of an embodiment of the sound generating device provided by the present invention;

[0043] Figure 5 For Figure 4 Enlarged view of part A in

[0044] Figure 6 Exploded view of the diaphragm and the waterproof film in an embodiment of the sound generating device provided by the present invention;

[0045] Figure 7 Schematic structural diagram of the first yoke in an embodiment of the sound generating device provided by the present invention;

[0046] Figure 8 Schematic structural diagram of the first yoke in another embodiment of the sound generating device provided by the present invention;

[0047] Figure 9 Schematic structural diagram of an embodiment of the sound generating module provided by the present invention;

[0048] Figure 10 Cross-sectional view of an embodiment of the sound generating module provided by the present invention;

[0049] Figure 11 Schematic structural diagram of another embodiment of the sound generating module provided by the present invention;

[0050] Figure 12 Schematic diagram of the simulation effect of an embodiment of the sound generating device provided by the present invention.

[0051] Explanation of the reference numerals in the drawings:

[0052] 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, Step portion; 2123, Second plate portion; 2125, Accommodating groove; 22, Voice coil; 23, Waterproof film; 231, First connecting portion; 232, Second connecting portion; 233, Third connecting 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, 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.

[0053] The realization, functional features and advantages of the objectives of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0054] 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 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.

[0055] 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 accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0056] At the same time, the meaning of "and / or" or "and / or" that appears throughout the text is to include three solutions. Taking "A and / or B" as an example, it includes the A solution, or the B solution, or the solution where A and B are satisfied simultaneously.

[0057] 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 such feature. In addition, the technical solutions between the 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 appears to be 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.

[0058] 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, which can be a mobile phone, earphone, smart wearable device, etc., and is not limited herein.

[0059] Please refer to Figures 1 to 8 As 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, a voice coil 22, and a waterproof film 23. 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 which are separately arranged. 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 waterproof film 23 includes a first connecting portion 231 located at the top of the voice coil 22, a second connecting portion 232 which is attached and connected 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. 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 apart 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 which 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 the projection along the first direction is 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. 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.

[0060] 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.

[0061] 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 to 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 periphery of the diaphragm 211 in the vibration system 2 can be directly fixed to the magnetic circuit system 3; or, the magnetic circuit system 3 and the vibration system 2 of the sound generating device 100 can be installed in the housing of the electronic device or the sound generating module as a split structure, which is not limited herein.

[0062] 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 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 both ends open. 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.

[0063] Optionally, the housing 1 can be an integral structure or can be formed by a combination of multiple 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.

[0064] 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.

[0065] In this embodiment, as Figures 3 to 6 shown, by setting the vibration plate 212 as a split structure, simultaneously setting the waterproof film 23, and setting the waterproof film 23 as a first connecting part 231, a second connecting part 232 and a third connecting part 233, the second connecting part 232 of the waterproof film 23 is attached and connected to the inner peripheral wall of the voice coil 22, and the first connecting part 231 is used to connect to the first plate part 2121, and the third connecting part 233 is used to connect to the second plate part 2123. In this way, not only can the connection and fixation of the first plate part 2121 and the second plate part 2123 be realized, but also the connection stability and strength between the vibration plate 212 and the voice coil 22 can be further improved by the cooperation of the waterproof film 23 and the vibration plate 212.

[0066] Optionally, the first connecting portion 231, the second connecting portion 232, and the third connecting portion 233 of the waterproof film 23 are of an integrally formed structure. It can be understood that this can not only improve the structural strength of the waterproof film 23, but also improve the waterproof sealing performance.

[0067] 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. The first connecting portion 231 extends in a direction away from the receiving groove 2125, and 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 both ends of the second connecting portion 232 along the first direction.

[0068] 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 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.

[0069] 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.

[0070] 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.

[0071] 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 vibrations from spreading along the surface of the diaphragm 211, thereby improving the acoustic performance of the sound generating device 100.

[0072] In this embodiment, the first central magnet 331 and the second central magnet 332 are arranged 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. 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 waterproof film 23 and the second plate portion 2123 to accommodate the first central magnet 331 and the second central magnet 332, and the voice coil 22 is subjected to the magnetic field of the first central magnet 331 when approaching the first central magnet 331, and the voice coil 22 is subjected to 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.

[0073] At the same time, by setting the central magnetic portion 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, 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 portion 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 in 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, thereby making the magnetic force line distribution more uniform. The voice coil 22 can be in a dense magnetic induction line area when reciprocatingly vibrating along the first direction, thereby making the BLx curve flatter, thereby reducing distortion, as Figure 12 shown; and, on the premise that the thickness of the sound generating device is certain, the central magnetic portion 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 portion 33 and improve the BL value.

[0074] Optionally, the voice coil 22 is an annular voice coil and extends in the first direction. In this way, the diaphragm 212 is provided with a first plate portion 2121 and a second plate portion 2123 located on different horizontal planes in the first direction, such that the top of the voice coil 22 is connected to the first plate portion 2121, that is, the voice coil 22 is fixed by the first plate portion 2121. 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 waterproof film 23 is provided as an integrally formed first connecting portion 231, a second connecting portion 232, and a third connecting portion 233. The first connecting portion 231 of the waterproof film 23 is used to connect the first plate portion 2121, and the third connecting portion 233 is used to connect the second plate portion 2123. Thus, the first plate portion 2121 and the second plate portion 2123 can be connected and fixed by the waterproof film 23, while achieving a waterproof sealing effect. The second connecting portion 232 is attached and connected to the inner peripheral wall of the voice coil 22. In this way, the first plate portion 2121 and the second plate portion 2123 on different horizontal planes can cooperate with the waterproof film 23 to center the vibration of the voice coil 22. At the same time, during the vibration of the voice coil 22, a receiving space is provided for the first central magnet 331 by the cooperation of the voice coil 22, the waterproof film 23, and the second plate portion 2123 of the diaphragm 212, ensuring the normal operation of the sound generating device 100.

[0075] 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, a voice coil 22, and a waterproof film 23. One end of the voice coil 22 is suspended in the magnetic gap 35. When an electric current is passed through 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 a 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 configured as 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 the vibration plate 212. The vibration plate 212 is configured as a first plate portion 2121 and a second plate portion 2123 that are located at different horizontal planes 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. The waterproof film 23 is configured as a first connecting portion 231 located at the top of the voice coil 22, a second connecting portion 232 that is adhesively connected to the inner peripheral wall of the voice coil 22, and a third connecting portion 233 located inside the voice coil 22. Thus, 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. This not only uses the waterproof film 23 to connect and fix the first plate portion 2121 and the second plate portion 2123, but also achieves a waterproof and sealing effect. The first central magnet 331 and the second central magnet 332 are respectively disposed on opposite sides of the second plate portion 2121. 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 and have opposite magnetization directions. Thereby, the cooperation of the first central magnet 331 and the second central magnet 332 with the side magnetic portions 34 is used to enhance 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 enhanced, thereby increasing the volume, improving the sound quality, and enhancing the acoustic performance of the sound generating device 100.Moreover, by using the waterproof film 23 and the first plate portion 2121 and the second plate portion 2123 of the vibrating plate 212 that are 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 waterproof film 23 and the second plate portion 2123 of the vibrating plate 212 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.;

[0076] In an embodiment, as Figures 3 to 6 shown, the outer periphery of the first plate portion 2121 is recessed and bent towards the voice coil 22 to form a step portion 2122, and the inner peripheral edge of the diaphragm 211 is supported and lapped on the step portion 2122.

[0077] In this embodiment, by recessing and bending the outer periphery of the first plate portion 2121 to form the step portion 2122, the inner peripheral edge of the diaphragm 211 is fixed by using the step 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 step portion 2122, the inner peripheral edge 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.

[0078] It can be understood that the step portion 2122 is formed by recessing and bending the outer periphery of the first plate portion 2121 towards the voice coil 22. Thus, the step portion 2122 and the inner peripheral edge of the first plate portion 2121 form a limiting groove, and cooperate with 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.

[0079] In an 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.

[0080] 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 avoid the collision interference between the second plate portion 2123 and 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.

[0081] In an embodiment, the magnetic circuit system 3 further includes a first yoke 31 and a second 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 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 yoke 32.

[0082] In this embodiment, as Figures 1 to 5 、 Figure 7 、 Figure 8 shown, by arranging the first yoke 31 and the second yoke 32, the first yoke 31 and the second yoke 32 are oppositely arranged. In this way, 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, and at the same time, the magnetic field lines of the first central magnet 331 and the second central magnet 332 are gathered to form a magnetic circuit.

[0083] 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 focusing effect is achieved. In this embodiment, the first yoke 31 and the second yoke 32 can be selected as a magnetic conductive plate structure.

[0084] In an 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 an arrangement 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 yoke 31, increasing the vibration space of the diaphragm assembly 21.

[0085] In this embodiment, the first recessed groove may be formed by the recess on the 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 flat; or, 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 arranged, which is not limited herein.

[0086] 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 arranged in the second recessed groove 321. It can be understood that such a setting can use the second recessed groove 321 to realize the 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.

[0087] In this embodiment, the second recessed groove 321 may be formed by the recess on the 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 flat; or, 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 arranged, which is not limited herein.

[0088] In one 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.

[0089] In this embodiment, as Figures 3 to 5 shown, by arranging 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.

[0090] 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 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.

[0091] 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.

[0092] In an 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 located outside the second central magnet 332 and is spaced apart from the second central magnet 332 to form a magnetic gap 35.

[0093] In this embodiment, as Figures 3 to 5 shown, 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. 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 apart from the second central magnet 332 to form a magnetic gap 35.

[0094] Optionally, the structural contours of the side magnet 341 and the side magnetic conductive 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 conductive 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 conductive 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 conductive plate 342 of the side magnetic part 34 can also be different. For example, one of the side magnet 341 and the side magnetic conductive plate 342 is an integral ring, and the other is a split structure, which is not limited herein.

[0095] In an embodiment, the projection of the side 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.

[0096] 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 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.

[0097] 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.

[0098] In an 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.

[0099] 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 ensure that the side magnetic part 34 can form magnetic circuits with the first central magnet 331 and the second central magnet 332 respectively, 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.

[0100] 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 ensures 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 setting 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.

[0101] 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 perpendicular to each other, and no limitation is made here.

[0102] In an embodiment, as Figure 1 、 Figure 3 、Figure 4 , Figure 7 and Figure 8 As shown in Figure 4 , Figure 7 , and Figure 8 , the outer periphery of the first yoke 31 bends and extends toward the second yoke 32 to form a first welding portion 315, and the first welding portion 315 is welded to the outer periphery of the second yoke 32. It can be understood that by welding the first welding portion 315 of the first yoke 31 to the second yoke 32, the connection stability is improved. In this way, when the sound generating device 100 is applied to an electronic device and a phenomenon such as dropping occurs, the structure of the sound generating device 100 can be ensured to be stable.

[0103] 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 yoke 31, and the plurality of first welding portions 315 are all welded to the outer periphery of the second yoke 32, and no limitation is made here.

[0104] In this embodiment, as shown in Figure 1 , Figure 3 , Figure 4 , Figure 7 , and Figure 8 , 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 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 yoke 31 are of an integrally formed structure, and no limitation is made here. Figure 1 , Figure 3 , Figure 4 , Figure 7 and Figure 8 In one 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 a phenomenon such as dropping occurs, the structure of the sound generating device 100 can be ensured to be stable.

[0105] 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 yoke 32, and the plurality of second welding portions are all welded to the outer periphery of the first yoke 31, and no limitation is made here.

[0106] 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 the 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, and no limitation is made here.

[0107] 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 the 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, and no limitation is made here.

[0108] In one 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 located on the side of the diaphragm assembly 21 facing away from the second yoke 32. The first central magnet 331 is disposed on the top plate portion 311. The outer periphery 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.

[0109] 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 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.

[0110] 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 mount 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.

[0111] In this embodiment, the first yoke 31 can 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 can 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 can also be connected by welding or bonding, which is not limited herein.

[0112] 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 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. The flat portion is provided with an installation opening, the first yoke 31 is disposed 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.

[0113] 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. The outer periphery of the diaphragm 211 is clamped between the housing 1 and the support platform 313.

[0114] In this embodiment, as Figure 1 、 Figure 3 、 Figure 4, Figure 7 and Figure 8 As shown in Figure 7 and Figure 8 , by setting the first yoke 31 to have a top plate portion 311 and a side plate portion 312 arranged at an 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 also fix the outer periphery of the diaphragm 211 by means of 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.

[0115] 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.

[0116] 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 such support platform or other structures, which is not limited herein.

[0117] In one embodiment, the edge magnetic portion 34 includes a stacked edge magnet 341 and an edge magnetic guide plate 342. The edge magnet 341 is connected to the second yoke 32, and the edge magnetic guide plate 342 is connected to the outer shell 1; wherein, the edge magnetic guide plate 342 and the outer shell 1 are an integrally formed structure.

[0118] In this embodiment, as shown in Figures 3 to 5 , the edge magnetic portion 34 of the magnetic circuit system 3 is provided 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 guide 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 guide 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 guide plate 342 are integrally drawn, which is not limited herein. Of course, in other embodiments, the outer shell 1 and the edge magnetic guide plate 342 can also be connected by welding or bonding, which is not limited herein.

[0119] It should be noted that the outer shell 1 is both used to fix the magnetic circuit system 3 and the diaphragm 211 of the vibration system 2, and can also 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.

[0120] 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.

[0121] ​​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.

[0122] 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 here.

[0123] 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.

[0124] 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, so that the electronic device or the sound emitting module has 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.

[0125] 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, so that the electronic device or the sound emitting module has 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.

[0126] 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 the magnetic energy product of the second central magnet 332. It can be understood that by setting like this, it can be ensured that the magnetic field intensity of the first central magnet 331 is greater than the magnetic field intensity of the second central magnet 332.

[0127] 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 in this way, the magnetic field strengths 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.

[0128] 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, 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. Thereby making the magnetic field strength of the first central magnet 331 greater than that of the second central magnet 332.

[0129] As Figures 9 to 11 shown, the present invention also proposes 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 all embodiments, it therefore 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.

[0130] 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.

[0131] 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-connected and enclose to form a receiving cavity. Optionally, the module upper shell and the module lower shell can be adhesively connected or welded.

[0132] 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.

[0133] 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.

[0134] 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 circular hole, an elliptical 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.

[0135] 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, which is not limited in the present invention.

[0136] In this embodiment, as Figures 9 to 11 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.

[0137] In one embodiment, as Figure 11 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.

[0138] 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.

[0139] In one embodiment, asFigure 9 and Figure 10 As shown in Figure 10 , 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.

[0140] 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 output channel, which is not limited herein.

[0141] 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 all the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0142] 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 all the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0143] Optionally, the above-mentioned electronic device can be a mobile phone, earphone, computer, PAD, smart wearable device, etc., and the present invention does not make specific restrictions thereon.

[0144] 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, a voice coil, and a waterproof film. 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 and a second plate portion that are separately arranged and located at 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 waterproof film includes a first connecting portion located at the top of the voice coil, a second connecting portion that is adhesively connected to the inner peripheral wall of the voice coil, and a third connecting portion located inside the voice coil. The first plate portion is connected to the first connecting portion, and the second plate portion is connected to the third connecting portion; 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 is spaced apart from the central magnetic portion 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.

2. The sound generating device according to claim 1, wherein The first connecting portion is clamped between the first plate portion and the top of the voice coil; and / or, the first connecting portion, the second connecting portion, and the third connecting portion are of an integrally formed structure; and / or, the extension length of the second connecting portion along the first direction is less than the extension length of the voice coil along the first direction; and / or, the first connecting portion and the third connecting portion are respectively connected to two ends of the second connecting portion along the first direction, and the second plate portion is provided on a side of the third connecting portion facing the first central magnet.

3. The sound generating device according to claim 1, wherein 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 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.

4. 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. One side of the first central magnet facing away from the diaphragm assembly is connected to the first magnetic yoke, and one 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.

5. The sound generating device according to claim 4, 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 yoke is bent and extended toward the first yoke to form a second welding portion, and the second welding portion is welded to the outer periphery of the first yoke.

6. The sound generating device according to claim 4, wherein 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.

7. The sound generating device according to claim 6, wherein, The first yoke further includes a side plate portion disposed at an angle to the top plate portion. The side plate portion is bent toward the side of 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.

8. The sound generating device according to claim 6, wherein, The edge magnetic portion includes a side magnet and a side magnetic conductive plate stacked, the side magnet is connected to the second 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.

9. The sound generating device according to claim 6, wherein, 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 communicating with the first cavity. Wherein, the sound outlet is disposed on the housing. Or, the first 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 between the housing and the first yoke.

10. 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 along the 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 along the 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 along the first direction is greater than the thickness of the second central magnet along the first direction.

11. 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 10, 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.

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

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

Images