Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic energy conversion, the sound production device comprises a magnetic circuit system and a vibration system, the magnetic circuit system comprises a magnetic conductive yoke, and a center magnetic circuit and a side magnetic circuit arranged on the magnetic conductive yoke, the side magnetic circuit is located at the periphery of the center magnetic circuit, and the side magnetic circuit and the center magnetic circuit are arranged at an interval to form a magnetic gap; the side magnetic circuit comprises two side magnets and a side magnetic conductive plate surrounding the central magnetic circuit; the side magnetic conductive plate comprises two long-side magnetic conductive parts and two short-side magnetic conductive parts, the two long-side magnetic conductive parts are connected with the ends, away from the magnetic conductive yoke, of the two side magnets respectively, each short-side magnetic conductive part comprises a magnetic conductive part body and an extension part arranged on the side, facing the magnetic conductive yoke, of the magnetic conductive part body, and the extension parts extend towards the magnetic conductive yoke; the vibration system comprises a vibrating diaphragm and a voice coil which is connected with the vibrating diaphragm and drives the vibrating diaphragm to vibrate. The voice coil is arranged corresponding to the magnetic gap. By arranging the extension part, magnetic loops on the two sides of the voice coil in the long axis direction of the central magnetic circuit are increased, and the acoustic performance of the sound production device is improved.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic energy conversion technology, and in particular to a sound-generating device and an electronic device. Background Technology

[0002] In recent years, with the rapid development of consumer electronics products, mobile phones, computers, headphones, VR devices and other products have been accepted by more and more people. As users continue to use them, their requirements for sound quality are also gradually increasing. This has forced technicians in this field to make gradual improvements to sound quality in order to meet users' growing demand for sound quality.

[0003] Sound-generating devices are important electroacoustic transducers in consumer electronics products, widely used as speakers, earpieces, headphones, and so on. For some speakers, they can meet the module filling requirements, but their performance is low; while for others, although they have better acoustic performance, it is difficult to meet the full filling requirements. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-generating device and electronic device that aims to solve the problem of how to improve the acoustic performance of a loudspeaker.

[0005] To achieve the above objectives, the present invention provides a sound-generating device comprising: A magnetic circuit system, the magnetic circuit system including a magnetic yoke, a central magnetic circuit and a side magnetic circuit disposed on the magnetic yoke, the side magnetic circuit being located around the central magnetic circuit and being spaced apart from the central magnetic circuit to form a magnetic gap; The side magnetic circuit includes two side magnets respectively disposed on both sides of the central magnetic circuit along the minor axis direction of the central magnetic circuit, and a side magnetic guide plate surrounding the central magnetic circuit; the side magnetic guide plate includes two long side magnetic guide portions arranged along the minor axis direction of the central magnetic circuit and two short side magnetic guide portions arranged along the major axis direction of the central magnetic circuit. The two long side magnetic guide portions are respectively connected to the ends of the two side magnets away from the magnetic guide yoke. Each short side magnetic guide portion includes a magnetic guide portion body and an extension portion disposed on the side of the magnetic guide portion body facing the magnetic guide yoke. The extension portion extends towards the magnetic guide yoke. A vibration system, comprising a diaphragm and a voice coil connected to and driving the diaphragm to vibrate, the voice coil being configured corresponding to the magnetic gap.

[0006] In one embodiment, the sound-generating device further includes a housing and a centering support plate. One end of the housing is connected to the magnetic yoke, and the other end of the housing is connected to the outer edge of the diaphragm. One end of the centering support plate is connected to the housing, and the other end of the centering support plate is connected to the voice coil. The short-side magnetic part has a first clearance portion that avoids the centering support plate.

[0007] In one embodiment, the first clearance portion includes a first clearance groove, which is formed by recessing the extension portion from one end near the magnetic yoke toward the direction away from the magnetic yoke. Alternatively, the first clearance portion includes a first clearance hole, and each of the short-side magnetic conductive portions includes two spaced-apart portions, with the first clearance hole formed between the two spaced-apart portions.

[0008] In one embodiment, the side magnetic plate and the outer shell are integrally injection molded parts; And / or, the outer shell, the diaphragm and the magnetic yoke form a cavity for accommodating the magnetic circuit system and the voice coil, the outer shell has a connecting hole that communicates with the cavity, the sound-generating device also includes a mesh cloth, the mesh cloth covers the connecting hole, and the mesh cloth and the outer shell are integrally injection molded parts.

[0009] In one embodiment, the centering support includes a first connecting portion, a second connecting portion, and a cantilever portion connecting the first connecting portion and the second connecting portion. The first connecting portion is connected to the housing, and the second connecting portion is connected to the end of the voice coil away from the diaphragm or to the sidewall of the voice coil.

[0010] In one embodiment, there are two first connecting portions and two cantilever portions, with the two first connecting portions spaced apart, and each first connecting portion is connected to the second connecting portion through a cantilever portion; And / or, the first connecting portion is sandwiched between the magnetic yoke and the outer shell; And / or, the centering support includes two, and the two centering supports are distributed correspondingly along the long axis of the magnetic circuit system.

[0011] In one embodiment, the edge of the magnetically conductive part body facing the voice coil side is bent and extended toward the magnetically conductive yoke to form the extension; And / or, the short-side magnetic conductive part and the long-side magnetic conductive part are integrally formed parts.

[0012] In one embodiment, the extension is formed with an arc-shaped magnetic conductive portion that is adapted to the corner portion of the voice coil.

[0013] In one embodiment, the central magnetic circuit includes a central magnetic guide plate and a central magnet stacked together, with the side of the central magnet away from the central magnetic guide plate connected to the magnetic yoke; the central magnet and the side magnet are both magnetized along the vibration direction of the diaphragm but in opposite directions. And / or, the diaphragm includes a folded ring and a dome, the center of the folded ring is formed into a through hole, and the dome covers the through hole and is connected to the folded ring.

[0014] The present invention also proposes an electronic device, which includes the above-described sound-generating device.

[0015] The technical solution of the present invention forms a side magnetic plate by means of two long side magnetic conductive parts and two short side magnetic conductive parts. Each of the two short side magnetic conductive parts includes a magnetic conductive part body and an extension part that are connected to each other. The extension part is disposed on the side of the magnetic conductive part body facing the magnetic guide yoke, and the extension part body extends towards the magnetic guide yoke, which increases the magnetic circuits on both sides of the voice coil along the long axis of the central magnetic circuit and improves the acoustic performance of the sound generating device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the sound-generating device provided by the present invention; Figure 2 A schematic diagram of the structure of an embodiment of the sound-generating device provided by the present invention from another perspective; Figure 3 An exploded structural diagram of an embodiment of the sound-generating device provided by the present invention; Figure 4 A cross-sectional structural schematic diagram of an embodiment of the sound-generating device provided by the present invention; Figure 5 A cross-sectional structural schematic diagram of another embodiment of the sound-generating device provided by the present invention; Figure 6 A cross-sectional view of another section of an embodiment of the sound-generating device provided by the present invention; Figure 7 A schematic diagram of the structure of an embodiment of the outer shell and the edge magnetic plate provided by the present invention; Figure 8 This is a schematic diagram of a structure of an embodiment of the centering support provided by the present invention.

[0018] Explanation of icon numbers: 100. Sound-generating device; 1. Magnetic circuit system; 11. Magnetic yoke; 111. Base plate; 112. Insertion part; 12. Central magnetic circuit; 121. Central magnet; 122. Central magnetic plate; 13. Side magnetic circuit; 131. Side magnet; 132. Side magnetic plate; 1321. Long side magnetic part; 1322. Short side magnetic part; 1323. Magnetic part body; 1324. First body; 1325. Second body; 1326. Extension 1327, First extension sub-section; 1328, Second extension sub-section; 1329, First clearance section; 14, Magnetic gap; 2, Vibration system; 21, Diaphragm; 211, Surround; 2111, Through hole; 212, Dome; 22, Voice coil; 23, Centering support; 231, First connecting part; 232, Second connecting part; 233, Cantilever part; 3, Housing; 31, Communicating hole; 32, Exposed hole; 4, Mesh fabric; 5, Slot.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] In recent years, with the rapid development of consumer electronics products, mobile phones, computers, headphones, VR devices and other products have been accepted by more and more people. As users continue to use them, their requirements for sound quality are also gradually increasing. This has forced technicians in this field to make gradual improvements to sound quality in order to meet users' growing demand for sound quality.

[0024] Sound-generating devices are important electroacoustic transducers in consumer electronics products, widely used as speakers, earpieces, headphones, and so on. For some speakers, they can meet the module filling requirements, but their performance is low; while for others, although they have better acoustic performance, it is difficult to meet the full filling requirements.

[0025] The inventors discovered that existing sound-generating devices, which can meet the requirements of module filling, often have insufficient performance.

[0026] In view of this, the present invention proposes a sound-generating device aimed at solving how to improve the acoustic performance of a loudspeaker.

[0027] Please see Figure 1 , Figure 3 , Figure 5 and Figure 7 In one embodiment of the present invention, the sound-generating device 100 includes a magnetic circuit system 1 and a vibration system 2. The magnetic circuit system 1 includes a magnetic yoke 11, a central magnetic circuit 12 disposed on the magnetic yoke 11, and a side magnetic circuit 13. The side magnetic circuit 13 is located around the central magnetic circuit 12 and is spaced apart from the central magnetic circuit 12 to form a magnetic gap 14. The side magnetic circuit 13 includes two side magnets 131 respectively disposed on both sides of the central magnetic circuit 12 along the short axis direction of the central magnetic circuit 12, and a side magnetic guide plate 132 surrounding the central magnetic circuit 12. The side magnetic guide plate 132 includes two long sides arranged along the short axis direction of the central magnetic circuit 12. The magnetic guide section 1321 and two short-side magnetic guide sections 1322 arranged along the long axis of the central magnetic circuit 12 are respectively connected to the ends of the two side magnets 131 away from the magnetic guide yoke 11. Each short-side magnetic guide section 1322 includes a magnetic guide body 1323 and an extension 1326 provided on the side of the magnetic guide body 1323 facing the magnetic guide yoke 11. The extension 1326 extends towards the magnetic guide yoke 11. The vibration system 2 includes a diaphragm 21 and a voice coil 22 connected to the diaphragm 21 and driving the diaphragm 21 to vibrate. The voice coil 22 is provided corresponding to the magnetic gap 14.

[0028] The sound-generating device 100 of the present invention can be a miniature loudspeaker unit. The sound-generating device 100 can be applied in the sound-generating module of electronic devices, such as computers, mobile phones, smart wearable devices, laptops, virtual reality devices, augmented reality devices, mixed reality devices, or extended reality devices. This embodiment uses a loudspeaker unit as an example for illustration.

[0029] The technical solution of this invention involves providing side magnets 131 on both sides of the central magnetic circuit 12 along its minor axis, so that the two side magnets 131, the central magnetic circuit 12, and the magnetic yoke 11 form a magnetic circuit on both sides of the minor axis of the voice coil 22, ensuring that the magnetic gap 14 has a relatively sufficient magnetic induction intensity. Furthermore, by adding a long-side magnetically conductive part 1321 to the side of each side magnet 131 away from the magnetic yoke 11, the long-side magnetically conductive part 1321 guides the magnetic field lines overflowing from the side magnets 131, thereby allowing more magnetic field lines to enter the magnetic gap 14, increasing the magnetic induction intensity of the magnetic gap 14, and thus improving the acoustic performance of the sound-generating device 100.

[0030] Furthermore, this embodiment also includes two short-side magnetically conductive portions 1322, each comprising a magnetically conductive body 1323 and an extension portion 1326. One end of each of the two long-side magnetically conductive portions 1321 is connected to both ends of one magnetically conductive body 1323, and the other end of each long-side magnetically conductive portion 1321 is connected to both ends of the other magnetically conductive body 1323. The extension portion 1326 is disposed on the side of the magnetically conductive body 1323 facing the guide yoke 11, and extends in the direction of the guide yoke 11. The provision of the extension portion 1326 increases the conductivity of the side magnetically conductive plate 132. The magnetic properties allow the central magnetic circuit 12, the magnetic yoke 11, and the short-side magnetic guide portion 1322 to form magnetic loops on both sides of the voice coil 22 along the long axis of the central magnetic circuit 12. Compared to the magnetic circuit system 1 without the short-side magnetic guide portion 1322, this embodiment adds the short-side magnetic guide portion 1322, especially the extension portion 1326 extending towards the magnetic yoke 11 on the side of the magnetic guide portion body 1323 facing the magnetic guide yoke 11. This increases the magnetic induction intensity of the magnetic gap 14 and thus improves the acoustic performance of the sound-generating device 100. Compared to the structure where the side magnet is set on the short side of the magnetic circuit system 1, this embodiment further reduces the size of the magnetic circuit system 1, facilitating the miniaturization design of the sound-generating device 100.

[0031] It should be noted that the voice coil 22 is used to drive the diaphragm 21 to vibrate along a first direction, which is... Figure 1 As shown in the vertical direction, the major axis of the central magnetic circuit 12 is... Figure 1 The front-to-back direction shown is such that the minor axis direction of the central magnetic circuit 12 is... Figure 1The left and right directions are shown; the major axis direction of the central magnetic circuit 12 and the minor axis direction of the central magnetic circuit 12 are perpendicular to each other; the minor axis direction of the central magnetic circuit 12 is the width direction of the central magnetic circuit 12, and the major axis direction of the central magnetic circuit 12 is the length direction of the central magnetic circuit 12. If the central magnetic circuit 12 is approximately square, then the major axis direction and the minor axis direction of the central magnetic circuit 12 refer to the extension directions of two adjacent sides of the central magnetic circuit 12, respectively; if the central magnetic circuit 12 is approximately elliptical, then the major axis direction of the central magnetic circuit 12 is the major axis direction of the ellipse, and the minor axis direction of the central magnetic circuit 12 is the minor axis direction of the ellipse. The shape of the central magnetic circuit 12 is not limited here. The long side magnetic conductive part 1321 extends along the major axis direction of the central magnetic circuit 12. The shape of the voice coil 22 can be square, elliptical, or other shapes, which are not limited here.

[0032] Please see Figures 2 to 4 In one embodiment, the sound-generating device 100 further includes a housing 3 and a centering support 23. One end of the housing 3 is connected to the magnetic yoke 11, and the other end of the housing 3 is connected to the outer edge of the diaphragm 21. One end of the centering support 23 is connected to the housing 3, and the other end of the centering support 23 is connected to the voice coil 22. The short-side magnetic conductive portion 1322 forms a first clearance portion 1329 to avoid the centering support 23. The centering support 23 is provided such that one end is connected to the housing 3 and the other end is connected to the voice coil 22, thereby making it less likely for the voice coil 22 to become polarized during vibration. The short-side magnetic conductive portion 1322 forms a first clearance portion 1329 to avoid the centering support 23. By providing the first clearance portion 1329, sufficient vibration space is ensured for the centering support 23. It should be noted that the number of centering support plates 23 can be one, two or more, without any restriction. The number of first clearance parts 1329 is the same as that of centering support plates 23 and they are set in a one-to-one correspondence.

[0033] Please see Figure 1 and Figure 2 According to one embodiment of the present invention, the outer shell 3 is provided with exposure holes 32 on both sides along the short axis direction of the central magnetic circuit 12, and the side magnet 131 extends into the exposure hole 32 on the side away from the central magnetic circuit 12, thereby increasing the volume of the side magnet 131 and improving the acoustic performance of the sound generating device 100.

[0034] Please see Figure 2 and Figure 3 According to one embodiment of the present invention, the magnetic yoke 11 includes a base plate 111 and an insertion part 112 disposed on the base plate 111. The insertion part 112 and the base plate 111 are integrally formed. The insertion part 112 extends in the direction of the diaphragm 21 along a first direction. A slot 5 is formed between the outer shell 3 and the side magnet 131. The insertion part 112 is inserted into the slot 5, thereby facilitating the positioning and installation of the magnetic yoke 11 and making the sound generating device 100 easier to assemble.

[0035] In one embodiment, the first clearance portion 1329 includes a first clearance groove, which is formed by recessing the extension portion 1326 from one end near the magnetic yoke 11 toward the direction away from the magnetic yoke 11; by providing the clearance groove, the centering support 23 is clearanceed, thereby ensuring that the centering support 23 has sufficient vibration space.

[0036] Please see Figure 7 In one embodiment, the first clearance portion 1329 includes a first clearance hole, and each short-side magnetically conductive portion 1322 includes two spaced-apart parts, with the first clearance hole formed between the two spaced-apart parts. The magnetically conductive portion body 1323 includes a first body 1324 and a second body 1325 spaced apart along the short axis of the central magnetic circuit 12. The extension portion 1326 includes a first extension sub-portion 1327 and a second extension sub-portion 1328 spaced apart along the short axis of the central magnetic circuit 12. The short-side magnetically conductive yoke 11 has two spaced-apart parts, one of which includes the first body 1324 and the first extension sub-portion 1327 connected to the first body 1324, and the other part includes the second body 1325 and the second extension sub-portion 1328 connected to the second body 1325. The first clearance hole is formed between these two parts. The first body 1324 and the second body 1325 are respectively connected to the two long-side magnetically conductive portions 1321.

[0037] Please see Figure 7 In one embodiment, the side magnetic plate 132 and the outer shell 3 are integrally injection molded parts; by integrally injection molding the side magnetic plate 132 and the outer shell 3, the side magnetic plate 132 and the outer shell 3 form a structural part, which facilitates the assembly of the sound generating device 100, simplifies the assembly process of the sound generating device 100, and improves the assembly efficiency and production efficiency of the sound generating device 100.

[0038] Please see Figure 1 and Figure 2 In one embodiment, the outer shell 3, the diaphragm 21, and the magnetic yoke 11 form a cavity for accommodating the magnetic circuit system 1 and the voice coil 22. The outer shell 3 has a connecting hole 31 that communicates with the cavity. The sound-generating device 100 also includes a mesh 4 that covers the connecting hole 31. The mesh 4 and the outer shell 3 are integrally injection-molded. By injection-molding the mesh 4 onto the outer shell 3, the mesh 4 and the outer shell 3 form a single structural component, which facilitates the assembly of the sound-generating device 100, simplifies the assembly process, and improves the assembly efficiency and production efficiency of the sound-generating device 100.

[0039] In this embodiment, a mesh fabric 4 is injection molded onto the outer shell 3 to intercept the sound-absorbing powder from entering the outer shell 3. The mesh fabric 4 and the extension 1326 are spaced apart to form an airflow channel connecting the internal cavity of the outer shell 3, so that the internal cavity of the outer shell 3 can be connected to the external environment through the mesh fabric 4, which meets the requirement of complete filling of the generating device. Compared with the traditional process of setting a steel mesh on the outside of the outer shell 3 and the magnetic yoke 11 to intercept the sound-absorbing powder from entering the outer shell 3, the technical solution of this embodiment integrally injection molds the mesh fabric 4 and the outer shell 3, which is less expensive.

[0040] It should be noted that there can be multiple connecting holes 31. Multiple connecting holes 31 set on the same side can share a mesh 4, that is, multiple connecting holes 31 located on one side of the central magnetic circuit 12 can share a mesh 4, and multiple connecting holes 31 located on the other side of the central magnetic circuit 12 can share another mesh 4. Alternatively, there can be multiple mesh 4, and the number of connecting holes 31 and mesh 4 can be the same and they can be set one-to-one. There is no restriction here.

[0041] Please see Figure 3 and Figure 8 In one embodiment, the centering support 23 includes a first connecting portion 231, a second connecting portion 232, and a cantilever portion 233 connecting the first connecting portion 231 and the second connecting portion 232. The first connecting portion 231 is connected to the outer shell 3, and the second connecting portion 232 is connected to the end of the voice coil 22 away from the diaphragm 21 or to the side wall of the voice coil 22. By providing the cantilever portion 233 to connect the first connecting portion 231 and the second connecting portion 232, the deformability of the centering support 23 is ensured. Furthermore, the connection of the first connecting portion 231 to the outer shell 3 and the connection of the second connecting portion 232 to the end of the voice coil 22 away from the diaphragm 21 or to the side wall of the voice coil 22 make it less prone to polarization during vibration.

[0042] Please see Figure 3 and Figure 8 In one embodiment, there are two first connecting portions 231 and two cantilever portions 233. The two first connecting portions 231 are spaced apart, and each first connecting portion 231 is connected to the second connecting portion 232 through a cantilever portion 233. The two first connecting portions 231 are both connected to the outer casing 3, thereby improving the reliability of the connection between the centering support 23 and the outer casing 3. Each first connecting portion 231 is connected to the second connecting portion 232 through a cantilever portion 233, thereby reducing the stress on each cantilever portion 233, increasing the lifespan of the centering support 23, and improving the centering capability of the voice coil 22.

[0043] Please see Figure 2In one embodiment, the first connecting part 231 is sandwiched between the magnetic yoke 11 and the outer shell 3; by sandwiching the first connecting part 231 between the magnetic yoke 11 and the outer shell 3, the stability of the connection between the first connecting part 231 and the outer shell 3 is further enhanced.

[0044] Please see Figure 3 In one embodiment, the centering support 23 includes two centers, which are distributed correspondingly along the long axis of the magnetic circuit system 1. By providing two centers 23 and distributing them correspondingly along the long axis of the magnetic circuit system 1, the centering effect on the voice coil 22 is enhanced, making it less prone to polarization when the voice coil 22 vibrates.

[0045] Please see Figure 4 and Figure 7 In one embodiment, the edge of the magnetic conductive part body 1323 facing the voice coil 22 is bent and extended toward the magnetic yoke 11 to form an extension 1326; wherein the edge of the magnetic conductive part body 1323 facing the voice coil 22 is bent and extended toward the magnetic yoke 11 to form the extension 1326, so that the extension 1326 is closer to the voice coil 22, so that the magnetic field lines overflowing from the extension 1326 can be cut more by the voice coil 22, thereby increasing the driving force of the voice coil 22 and improving the acoustic performance of the sound generating device 100.

[0046] Please see Figure 7 In one embodiment, the short-side magnetic conductive portion 1322 and the long-side magnetic conductive portion 1321 are integrally molded parts. Since the short-side magnetic conductive portion 1322 and the long-side magnetic conductive portion 1321 are integrally molded parts, the magnetic conductive plate 132 can participate in the injection molding as a structural component when injection molding with the outer shell 3, making the injection molding process easier and the operation simpler.

[0047] Please see Figure 4 In one embodiment, the extension 1326 is formed with an arc-shaped magnetic guide portion that is adapted to the corner portion of the voice coil 22. The extension 1326 is formed with an arc-shaped magnetic guide portion that is adapted to the corner portion of the voice coil 22, thereby allowing more magnetic field lines to pass through the voice coil 22 and improving the acoustic performance of the sound-generating device 100.

[0048] Please see Figure 3 and Figure 6In one embodiment, the central magnetic circuit 12 includes a central magnetic guide plate 122 and a central magnet 121 stacked together. The side of the central magnet 121 away from the central magnetic guide plate 122 is connected to the magnetic yoke 11. The central magnet 121 and the side magnet 131 are both magnetized along the vibration direction of the diaphragm 21 and the magnetization directions are opposite. By setting the central magnetic guide plate 122 on the side of the central magnet 121 away from the magnetic yoke 11, the central magnetic guide plate 122 corrects the magnetic field lines, enhances the magnetic induction intensity of the magnetic gap 14, and improves the acoustic performance of the sound generating device 100.

[0049] Please see Figure 1 and Figure 3 In one embodiment, the diaphragm 21 includes a folded ring 211 and a dome 212. The center of the folded ring 211 forms a through hole 2111, and the dome 212 covers the through hole 2111 and is connected to the folded ring 211. The outer edge of the folded ring 211 is connected to the outer shell 3, and the center of the folded ring 211 forms the through hole 2111. The dome 212 is connected to the folded ring 211 and covers the through hole 2111. By providing the dome 212 on the folded ring 211, the vibration performance of the diaphragm 21 is ensured.

[0050] The present invention also proposes an electronic device, which includes the sound-generating device 100 described above. The specific structure of the sound-generating device 100 is as described in the above embodiments. Since this electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0051] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A sound-generating device, characterized in that, include: A magnetic circuit system, the magnetic circuit system including a magnetic yoke, a central magnetic circuit and a side magnetic circuit disposed on the magnetic yoke, the side magnetic circuit being located around the central magnetic circuit and being spaced apart from the central magnetic circuit to form a magnetic gap; The side magnetic circuit includes two side magnets respectively disposed on both sides of the central magnetic circuit along the minor axis direction of the central magnetic circuit, and a side magnetic guide plate surrounding the central magnetic circuit; the side magnetic guide plate includes two long side magnetic guide portions arranged along the minor axis direction of the central magnetic circuit and two short side magnetic guide portions arranged along the major axis direction of the central magnetic circuit. The two long side magnetic guide portions are respectively connected to the ends of the two side magnets away from the magnetic guide yoke. Each short side magnetic guide portion includes a magnetic guide portion body and an extension portion disposed on the side of the magnetic guide portion body facing the magnetic guide yoke. The extension portion extends towards the magnetic guide yoke. A vibration system, comprising a diaphragm and a voice coil connected to and driving the diaphragm to vibrate, the voice coil being configured corresponding to the magnetic gap.

2. The sound-generating device as described in claim 1, characterized in that, The sound-generating device further includes a housing and a centering support plate. One end of the housing is connected to the magnetic yoke, and the other end of the housing is connected to the outer edge of the diaphragm. One end of the centering support plate is connected to the housing, and the other end of the centering support plate is connected to the voice coil. The short side magnetic part forms a first avoidance part that avoids the centering support plate.

3. The sound-generating device as described in claim 2, characterized in that, The first clearance portion includes a first clearance groove, which is formed by recessing the extension portion from one end near the magnetic yoke toward the direction away from the magnetic yoke. Alternatively, the first clearance portion includes a first clearance hole, and each of the short-side magnetic conductive portions includes two spaced-apart portions, with the first clearance hole formed between the two spaced-apart portions.

4. The sound-generating device as described in claim 2, characterized in that, The side magnetic plate and the outer shell are integrally injection molded parts; And / or, the outer shell, the diaphragm and the magnetic yoke form a cavity for accommodating the magnetic circuit system and the voice coil, the outer shell has a connecting hole that communicates with the cavity, the sound-generating device also includes a mesh cloth, the mesh cloth covers the connecting hole, and the mesh cloth and the outer shell are integrally injection molded parts.

5. The sound-generating device as described in claim 2, characterized in that, The centering support includes a first connecting part, a second connecting part, and a cantilever part connecting the first connecting part and the second connecting part. The first connecting part is connected to the outer shell, and the second connecting part is connected to the end of the voice coil away from the diaphragm or to the side wall of the voice coil.

6. The sound-generating device as described in claim 5, characterized in that, There are two first connecting parts and two cantilever parts, with the two first connecting parts spaced apart, and each first connecting part is connected to the second connecting part through a cantilever part. And / or, the first connecting portion is sandwiched between the magnetic yoke and the outer shell; And / or, the centering support includes two, the two centering supports are distributed correspondingly along the long axis of the magnetic circuit system, and the number of the first clearance portion is the same as that of the centering support and they are arranged in a one-to-one correspondence.

7. The sound-generating device as described in any one of claims 1 to 6, characterized in that, The edge of the magnetic conductive part body facing the voice coil side is bent and extended in the direction of the magnetic conductive yoke to form the extension part; And / or, the short-side magnetic conductive part and the long-side magnetic conductive part are integrally formed parts.

8. The sound-generating device as described in any one of claims 1 to 6, characterized in that, The extension has an arc-shaped magnetic conductive part that is adapted to the corner of the voice coil.

9. The sound-generating device as described in any one of claims 1 to 6, characterized in that, The central magnetic circuit includes a central magnetic guide plate and a central magnet stacked together. The side of the central magnet away from the central magnetic guide plate is connected to the magnetic yoke. The central magnet and the side magnet are both magnetized along the vibration direction of the diaphragm, but in opposite directions. And / or, the diaphragm includes a folded ring and a dome, the center of the folded ring is formed into a through hole, and the dome covers the through hole and is connected to the folded ring.

10. An electronic device, characterized in that, The electronic device includes a sound-generating device as described in any one of claims 1 to 9.

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