Sound production device and electronic device

Abstract

The application discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic energy conversion, wherein the sound production device comprises a magnetic circuit system, a shell, a mesh cloth and a vibration system; the magnetic circuit system comprises a magnetic yoke, a center magnetic circuit arranged on the magnetic yoke and a side magnetic circuit; the side magnetic circuit comprises two side magnets; the magnetic yoke comprises a bottom plate and two side plates connected with the bottom plate; the side magnetic circuit and the side plates are arranged around the periphery of the center magnetic circuit and are spaced apart from the center magnetic circuit to form a magnetic gap; the shell is provided with a communication hole; the mesh cloth covers the communication hole; the mesh cloth and the side plates are spaced apart to form an air flow channel; the air flow channel is connected with an external environment and a cavity on the inner side of the side plate through the mesh cloth; and the vibration system comprises a diaphragm and a voice coil, and the voice coil is arranged corresponding to the magnetic gap. The mesh cloth and the shell are integrally injection molded to realize complete filling; on this basis, the two side plates and the center magnetic circuit form a magnetic loop, the magnetic induction intensity of the magnetic gap is improved, 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 (Virtual Reality) devices, etc. 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 how to improve the acoustic performance of a loudspeaker while achieving full filling.

[0005] To achieve the above objectives, the present invention provides a sound-generating device comprising: A magnetic circuit system includes a magnetic yoke, a central magnetic circuit and side magnetic circuits disposed on the magnetic yoke, the side magnetic circuits including two side magnets extending along the long axis of the magnetic circuit system and located on opposite sides of the central magnetic circuit, the magnetic yoke including a base plate and two side plates connected to the base plate, the two side plates being located at both ends of the base plate along the long axis of the magnetic circuit system, the side magnetic circuits and the side plates surrounding the central magnetic circuit and being spaced apart from the central magnetic circuit to form a magnetic gap; The outer casing has a communicating hole; The mesh covers the connecting hole. The outer shell, the mesh, and the magnetic yoke are integrally injection molded parts. The mesh and the side plate are spaced apart to form an airflow channel. The airflow channel connects the external environment and the cavity inside the side plate through the mesh. A vibration system, comprising a diaphragm and a voice coil connected to the diaphragm and driving the diaphragm to vibrate in a first direction, the voice coil being disposed corresponding to the magnetic gap.

[0006] In one embodiment, the housing comprises two, and the two housings are integrally injection molded with the two side panels respectively.

[0007] In one embodiment, the sound-generating device further includes a bracket, the bracket including two short shaft segments and two long shaft segments respectively disposed at both ends of the short shaft segments and respectively connected to the two short shaft segments, the outer edge of the diaphragm is connected to one end of the bracket, the end of the short shaft segment away from the diaphragm is connected to the outer shell, and the end of the long shaft segment away from the diaphragm is connected to the side magnetic circuit.

[0008] In one embodiment, the bracket is made of metal and is welded to the edge magnetic circuit; And / or, the bracket also has a corner segment connecting the long axis segment and the short axis segment, the corner segment being connected to the housing, the corner segment having a protrusion extending toward the housing, and the housing having a matching recess.

[0009] In one embodiment, the sound-generating device further includes a conductive support, the vibration system further includes a centering support, the magnetic circuit system has a mounting hole that passes through the central magnetic circuit and the magnetic yoke, and the conductive support is embedded in the mounting hole; one end of the centering support is electrically connected to the conductive support, and the other end of the centering support is connected to the diaphragm and electrically connected to the conductor of the voice coil and the centering support.

[0010] In one embodiment, the conductive support includes an insulating body and a conductive insert disposed on the insulating body. The insulating body is connected to the base plate. The conductive insert includes a first conductive portion and a second conductive portion exposed on both sides of the insulating body along the first direction. The first conductive portion is electrically connected to the second conductive portion. The first conductive portion is disposed toward the centering support piece and electrically connected to the centering support piece. The second conductive portion is used to be electrically connected to an external power source.

[0011] In one embodiment, the conductive insert further includes a third conductive portion embedded in the insulating body, one end of the third conductive portion being connected to the first conductive portion, and the other end of the third conductive portion being connected to the second conductive portion; And / or, the insulating body and the base plate are integrally injection molded parts.

[0012] In one embodiment, the mounting hole has a clearance space to avoid the centering support piece; And / or, a wiring groove is provided at one end of the base plate away from the diaphragm, one end of the wiring groove is connected to the mounting hole, and the other end of the wiring groove extends toward the outer edge of the base plate and passes through the outer edge of the base plate.

[0013] In one embodiment, the centering support includes a first fixing part, a cantilever part, a bending part, and a second fixing part connected in sequence. The first fixing part is electrically connected to the first conductive part, the bending part extends along the first direction, one side of the second fixing part is connected to the diaphragm, and the other side of the second fixing part can also be electrically connected to the wire of the voice coil.

[0014] In one embodiment, the diaphragm includes a folded ring, a first diaphragm plate, and a second diaphragm plate. The folded ring is spaced apart from the magnetic circuit system. A first through hole is provided at the center of the folded ring. The first diaphragm plate is provided corresponding to the first through hole and connected to the folded ring. A centering support plate is connected to the first diaphragm plate. A second through hole is provided at the center of the first diaphragm plate. The second diaphragm plate covers the second through hole and is connected to the first diaphragm plate. The voice coil is connected to the folded ring or the first diaphragm plate.

[0015] In one embodiment, the portion of the first vibrating plate near the second through hole is provided with a boss extending toward the centering support plate, and the boss is connected to the side of the centering support plate away from the conductive support.

[0016] In one embodiment, the central magnetic circuit includes a central magnet and a central magnetic guide plate stacked together. The side of the central magnet away from the central magnetic guide plate is connected to the magnetic guide yoke. The side of the central magnetic guide plate away from the central magnet is provided with a first clearance groove for avoiding the wire of the voice coil.

[0017] The present invention also proposes an electronic device, which includes the above-described sound-generating device.

[0018] The technical solution of the present invention achieves complete filling by integrally injection molding the mesh and the outer shell. On this basis, the technical solution of the present invention also improves the magnetic induction intensity of the magnetic gap by setting two side plates in the long axis direction of the magnetic circuit system to form a magnetic circuit with the central magnetic circuit, thereby improving the acoustic performance of the sound-generating device. Attached Figure Description

[0019] 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.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of the sound-generating device provided by the present invention; Figure 2A 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 view of another cut position of an embodiment of the sound-generating device provided by the present invention; Figure 6 A cross-sectional view of another cut position of a sound-generating device according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of an embodiment of the central magnetic guide plate provided by the present invention; Figure 8 This is a schematic diagram of the structure of an embodiment of the first vibrating plate provided by the present invention; Figure 9 This is a schematic diagram of the structure of an embodiment of the centering support provided by the present invention; Figure 10 This is a schematic diagram of the structure of another embodiment of the centering support provided by the present invention.

[0021] Explanation of icon numbers: 100. Sound-generating device; 1. Magnetic circuit system; 11. Magnetic yoke; 111. Base plate; 1111. Wiring trough; 112. Side plate; 12. Central magnetic circuit; 121. Central magnet; 122. Central magnetic guide plate; 1221. First clearance groove; 1222. Second clearance groove; 13. Side magnetic circuit; 131. Side magnet; 132. Side magnetic guide plate; 1321. Third clearance groove; 14. Magnetic gap; 15. Mounting hole; 2. Housing; 21. Connecting hole; 22. Recess; 23. Exposed hole; 3. Mesh fabric; 31. Airflow channel; 4. Vibration system; 41. Diaphragm; 411. First vibrating plate; 4111. Second through hole; 411 2. Boss; 412. Second diaphragm; 413. Baffle; 4131. First through hole; 42. Voice coil; 43. Centering support; 431. First fixing part; 4311. First pad; 432. Second fixing part; 4321. Second pad; 433. Cantilever part; 434. Bending part; 5. Bracket; 51. Short shaft section; 52. Long shaft section; 53. Corner section; 531. Protrusion; 6. Conductive support; 61. Insulating body; 611. Groove; 62. Conductive insert; 621. First conductive part; 6211. First conductive pad; 622. Second conductive part; 6221. Second conductive pad; 623. Third conductive part.

[0022] 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

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Sound-generating devices are crucial electroacoustic transducers in consumer electronics, widely used in loudspeakers, earpieces, and headphones. While some loudspeakers can meet module filling requirements, their performance is low; others, despite possessing better acoustic performance, struggle to achieve full filling. Full filling refers to completely filling the rear cavity with sound-absorbing powder.

[0028] The inventors discovered that in existing sound-generating devices, the implementation scheme that can achieve complete filling uses a flat magnetic yoke, with the outer shell covering the flat magnetic yoke. The side walls of the outer shell are injection molded with mesh fabric to prevent the sound-absorbing powder from entering the shell. Although this scheme can achieve complete filling, the performance of the sound-generating device is not high.

[0029] In view of this, the present invention proposes a sound-generating device aimed at solving how to improve the acoustic performance of a loudspeaker while achieving full filling.

[0030] Please see Figures 1 to 3 In one embodiment of the present invention, the sound-generating device 100 includes a magnetic circuit system 1, a housing 2, a mesh fabric 3, and a vibration system 4. The magnetic circuit system 1 includes a magnetic yoke 11, a central magnetic circuit 12 and a side magnetic circuit 13 disposed on the magnetic yoke 11. The side magnetic circuit 13 includes two side magnets 131 extending along the long axis of the magnetic circuit system 1 and located on opposite sides of the central magnetic circuit 12. The magnetic yoke 11 includes a base plate 111 and two side plates 112 connected to the base plate 111. The two side plates 112 are respectively located at both ends of the base plate 111 along the long axis of the magnetic circuit system 1. Plate 112 surrounds the periphery of the central magnetic circuit 12 and is spaced apart from the central magnetic circuit 12 to form a magnetic gap 14; the outer shell 2 has a connecting hole 21; the mesh 3 covers the connecting hole 21, the outer shell 2, the mesh 3 and the magnetic yoke 11 are integral injection molded parts, the mesh 3 and the side plate 112 are spaced apart to form an airflow channel 31, the airflow channel 31 connects the external environment and the cavity inside the side plate 112 through the mesh 3; the vibration system 4 includes a diaphragm 41 and a voice coil 42 connected to the diaphragm 41 and driving the diaphragm 41 to vibrate in a first direction, the voice coil 42 is set corresponding to the magnetic gap 14.

[0031] 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.

[0032] The technical solution of the present invention provides a side plate 112 on the base plate 111, so that the central magnetic circuit 12, the base plate 111 and the side plate 112 form a new magnetic guiding circuit. The magnetic field lines overflowing from one end of the central magnetic circuit 12 are guided into the magnetic gap 14 by the base plate 111 and the side plate 112, thereby increasing the magnetic induction intensity of the magnetic gap 14. After passing through the voice coil 42, the magnetic field lines return to the other end of the central magnetic circuit 12. Compared with the solution without the side plate 112, this solution increases the magnetic guiding circuit of the magnetic circuit system 1 by adding side plates 112 that are spaced apart on both sides of the central magnetic circuit 12 along the long axis of the magnetic circuit system 1, thereby increasing the magnetic induction intensity of the magnetic gap 14 and improving the acoustic performance of the sound generating device 100. It should be noted that the central magnetic circuit 12, the side magnet 131, and the base plate 111 also constitute a magnetic conduction circuit. The magnetic field lines overflowing from one end of the central magnetic circuit 12 enter the base plate 111 and, guided by the base plate 111, enter one end of the side magnet 131. The magnetic field lines overflowing from the other end of the side magnet 131 will enter the magnetic gap 14, pass through the voice coil 42, and return to the other end of the central magnetic circuit 12, thus forming a magnetic conduction circuit and ensuring the magnetic induction intensity of the magnetic gap 14.

[0033] Furthermore, by injecting a mesh 3 onto the outer shell 2 to intercept the sound-absorbing powder from entering the outer shell 2, and by setting the side plate 112 on the bottom plate 111 at intervals with the mesh 3, an airflow channel 31 is formed between the mesh 3 and the side plate 112. One end of the airflow channel 31 is connected to the cavity inside the side plate 112, and the other end of the airflow channel 31 is connected to the external environment through the mesh 3, thus meeting the requirement of complete filling.

[0034] In addition, the outer shell 2, the mesh fabric 3 and the magnetic yoke 11 are integrally injection molded parts, which makes it easier to assemble the sound generating device 100. The outer shell 2, the mesh fabric 3 and the magnetic yoke 11 are installed as a single component. Compared with installing these three components separately, the installation process of the sound generating device 100 is simplified, and the assembly efficiency and production efficiency of the sound generating device 100 are effectively improved.

[0035] It should be noted that the first direction is Figure 1 As shown in the up-down direction, the minor axis direction of magnetic circuit system 1 is... Figure 1 As shown in the left-right direction, the major axis direction of magnetic circuit system 1 is... Figure 1 The front and back directions are shown; the minor axis direction of the magnetic circuit system 1 is the width direction of the magnetic circuit system 1, and the major axis direction of the magnetic circuit system 1 is the length direction of the magnetic circuit system 1. If the magnetic circuit system 1 is approximately square in shape, then the major axis direction and the minor axis direction of the magnetic circuit system 1 refer to the extension directions of two adjacent sides of the magnetic circuit system 1, respectively; the minor axis direction, the major axis direction of the magnetic circuit system 1, and the first direction are perpendicular to each other.

[0036] It should also be noted that the base plate 111 and the side plate 112 are integrally formed parts; the two side magnets 131 are respectively arranged at intervals on both sides of the central magnetic circuit 12 along the short axis direction of the magnetic circuit system 1, and the side magnet 131 away from the diaphragm 41 is connected to the base plate 111.

[0037] According to one embodiment of the present invention, both ends of any side plate 112 are spaced apart from two side magnets 131 to form a gap connecting the airflow channel 31 and the magnetic gap 14, which increases the path for the airflow channel 31 to communicate with the internal cavity of the outer shell 2, and is more conducive to maintaining the communication between the internal cavity of the outer shell 2 and the external environment.

[0038] According to another embodiment of the present invention, the side magnetic circuit 13 further includes two side magnetic guide plates 132. Each side magnet 131 is connected to a side magnetic guide plate 132 on the side away from the bottom plate 111. By setting the side magnetic guide plates 132, the magnetic field lines overflowing from the side magnet 131 are guided, so that more magnetic field lines enter the magnetic gap 14, thereby increasing the magnetic induction intensity of the magnetic gap 14 and improving the acoustic performance of the sound generating device 100.

[0039] Please see Figures 4 to 6 In one embodiment, the outer shell 2 comprises two shells, which are integrally injection molded with two side plates 112. The two shells 2 are arranged along the long axis of the magnetic circuit system 1, and both shells 2 are located outside the side plates 112. Each shell 2 has a connecting hole 21. The number of connecting holes 21 can be one, two, or more, without limitation. If there are two or more connecting holes 21, multiple connecting holes 21 on the same shell 2 can share a single mesh 3, or each connecting hole 21 can be covered by a separate mesh 3. The number of mesh 3s is consistent with the number of connecting holes 21 and they are arranged in a one-to-one correspondence, without limitation. Each mesh 3 is spaced apart from the opposite side plate 112 to form an airflow channel 31. Both shells 2 are integrally injection molded with the corresponding side plates 112 to form a structural component, facilitating assembly.

[0040] Please see Figure 3 and Figure 4In one embodiment, the sound-generating device 100 further includes a bracket 5, which includes two short shaft segments 51 and two long shaft segments 52 respectively disposed at both ends of the short shaft segments 51 and respectively connected to the two short shaft segments 51. The outer edge of the diaphragm 41 is connected to one end of the bracket 5, the end of the short shaft segment 51 away from the diaphragm 41 is connected to the outer shell 2, and the end of the long shaft segment 52 away from the diaphragm 41 is connected to the side magnetic circuit 13. One end of each of the two long shaft segments 52 is connected to both ends of a short shaft segment 51, and the other ends of the two long shaft segments 52 are connected to both ends of another short shaft segment 51. The outer edge of the diaphragm 41 is connected to the end of the bracket 5 away from the base plate 111, and the end of the short shaft segment 51 away from the diaphragm 41 is connected to the outer shell 2. The long shaft segments 52 are spaced apart from the base plate 111 in the first direction to form exposed holes 23. The end of the side magnetic circuit 13 away from the central magnetic circuit 12 extends into the exposed hole 23, increasing the volume of the side magnetic circuit 13, thereby effectively improving the acoustic performance of the sound-generating device 100. The side of the long shaft segment 52 facing the base plate 111 is connected to the side magnetic guide plate 132.

[0041] In one embodiment, the bracket 5 is made of metal and is welded to the side magnetic circuit 13. The bracket 5 is made of metal, which can be stainless steel or SPCC. SPCC is cold-rolled carbon steel sheet and strip as defined by Japanese Industrial Standard (JIS G 3141). The bracket 5 is welded to the side magnetic plate 132 to improve the connection strength between the two. The welding point is located at the joint position of the bracket 5 and the side magnetic plate 132 on the outer side. There are multiple welding points, which are arranged at intervals along the length of the side magnetic plate 132.

[0042] According to one embodiment of the present invention, the bracket 5 is made of metal, and the side magnetic plate 132 and the bracket 5 are integrally formed, that is, the bracket 5 and the side magnetic plate 132 are made of the same metal material to form an integrated shell 2, thereby significantly improving the connection strength between the side magnetic plate 132 and the bracket 5; and assembling them as an integral structural component also simplifies the assembly process of the sound generating device 100 and improves the assembly efficiency of the sound generating device 100. It should be noted that the bracket 5 and the side magnetic plate 132 can both be made of SPCC material. Among them, a third clearance groove 1321 is provided on the side of the side magnetic plate 132 away from the side magnet 131. The third clearance groove 1321 is used to avoid the folded ring 413, ensuring that the folded ring 413 has sufficient vibration space.

[0043] Please see Figure 2 , Figure 3 and Figure 4In one embodiment, the bracket 5 further has a corner section 53 connecting the long axis section 52 and the short axis section 51. The corner section 53 is connected to the outer casing 2, and the corner section 53 has a protrusion 531 extending toward the outer casing 2. The outer casing 2 has a matching recess 22. The precise positioning and installation of the bracket 5 can be achieved through the insertion and engagement of the protrusion 531 and the recess 22, making the sound-generating device 100 easier to assemble.

[0044] Please see Figure 2 , Figure 3 and Figure 6 In one embodiment, the sound-generating device 100 further includes a conductive support 6, the vibration system 4 further includes a centering support 43, the magnetic circuit system 1 has a mounting hole 15 that passes through the central magnetic circuit 12 and the magnetic yoke 11, and the conductive support 6 is embedded in the mounting hole 15; one end of the centering support 43 is electrically connected to the conductive support 6, and the other end of the centering support 43 is connected to the diaphragm 41 and electrically connected to the wire of the voice coil 42.

[0045] The inventors discovered that the existing voice coil 42 wires are generally wrapped around the outer periphery of the voice coil 42 and connected to the pads located on the outer periphery of the voice coil 42. Therefore, space needs to be reserved around the voice coil 42 for the wires of the voice coil 42 to run, which leads to an adaptive reduction in the overall size of the voice coil 42 and the magnetic circuit system 1 to avoid the wires of the voice coil 42, resulting in low performance of the sound generating device 100.

[0046] In this embodiment, the central magnetic circuit 12 and the magnetic yoke 11 are penetrated through the mounting hole 15, thereby freeing up space for the installation of the conductive support 6. One end of the centering support plate 43 is electrically connected to the wire of the voice coil 42, and the other end of the centering support plate 43 is electrically connected to the conductive support 6. The conductive support 6 is also electrically connected to an external power source, thereby realizing the electrical connection between the voice coil 42 and the external power source. Since the conductive support 6 is set in the mounting hole 15, the wire of the voice coil 42 extends inward and is electrically connected to the centering support plate 43. Compared with the existing setting where the lead wire of the voice coil 42 extends outward and then runs around the periphery of the voice coil 42, the lead wire of the voice coil 42 in this embodiment extends inward, so the wire running does not occupy the space outside the voice coil 42. This allows the space that originally needed to avoid the wire running of the voice coil 42 to be effectively utilized. This space can be used to make the voice coil 42 and the magnet larger, thereby significantly improving the acoustic performance of the sound generating device 100.

[0047] Furthermore, one end of the centering support 43 is electrically connected to the conductive support 6, and the other end of the centering support 43 is connected to the diaphragm 41, which in turn is connected to the voice coil 42. The centering support 43 effectively improves the centering effect of the voice coil 42, making it less prone to polarization during vibration, thus ensuring the sound output effect of the sound-generating device 100. At the same time, the magnetic circuit system 1 does not require an intermittent design to avoid the centering support 33, which allows for an increase in the magnet volume and improved magnetic field performance.

[0048] It should be noted that the mounting hole 15 penetrates the center of the central magnetic circuit 12. Since the magnetic field utilization rate at the center of the central magnetic circuit 12 is low, placing the mounting hole 15 at this position has little impact on the magnetic field strength of the magnetic gap 14. The conductive support 6 is placed inside the mounting hole 15, thus completing the installation of the conductive support 6 without affecting the overall size of the sound-generating device 100. The centering support 43 is also located inside the mounting hole 15. Compared to placing the centering support 43 on the outer periphery of the voice coil 42, this embodiment does not require reserving installation space for the centering support 43 on the outer periphery of the voice coil 42, nor does it require reserving space to avoid the centering support 43 on the outer periphery of the voice coil 42. This space can be utilized to make the volume of the voice coil 42 and the magnetic circuit system 1 larger, significantly improving the magnetic induction intensity of the magnetic gap 14. The improvement is greater than the impact of placing the mounting hole 15 at the center of the central magnetic circuit 12 on the magnetic gap 14, thus improving the performance of the sound-generating device 100.

[0049] Furthermore, since the magnetic leakage at the center of the central magnetic circuit 12 is severe, the mounting hole 15 needs to be formed by removing at least a portion of the central magnet 121 at the center of the central magnetic circuit 12. This can reduce the magnetic leakage of the central magnet 121. When the sound-generating device 100 is assembled with an electronic device, the impact of the magnetic leakage of the central magnet 121 in the sound-generating device 100 on the performance of the electronic device can be reduced, thus meeting the requirements of the electronic device for the amount of magnetic leakage.

[0050] It should also be noted that the shape of the mounting hole 15 can be circular or square, and there is no limitation here. Among them, the corner magnetic guide part is arc-shaped, the voice coil 42 is a rectangular voice coil 42, the central magnet 121 and the central magnetic guide plate 122 are also rectangular, and the corner of the rectangular voice coil 42 is also arc-shaped. The shape of the corner magnetic guide part matches the corner of the rectangular voice coil 42, so that more magnetic lines of force can pass through the voice coil 42, thereby improving the acoustic performance of the sound generating device 100.

[0051] Please see Figure 2 , Figure 5 and Figure 6In one embodiment, the conductive support 6 includes an insulating body 61 and a conductive insert 62 disposed on the insulating body 61. The insulating body 61 is connected to the base plate 111. The conductive insert 62 includes a first conductive portion 621 and a second conductive portion 622 exposed on both sides of the insulating body 61 along a first direction. The first conductive portion 621 and the second conductive portion 622 are electrically connected. The first conductive portion 621 is disposed towards the centering support plate 43 and is electrically connected to the centering support plate 43. The second conductive portion 622 is used for electrical connection to an external power source. The first conductive portion 621 is electrically connected to the centering support plate 43, and the centering support plate 43 is electrically connected to the wire of the voice coil 42. The second conductive portion 622 is electrically connected to the external power source and is also electrically connected to the first conductive portion 621, so that the voice coil 42 can be connected and energized by the external power source. The first conductive part 621 may be directly connected to the second conductive part 622, or the first conductive part 621 may be electrically connected to the second conductive part 622 through a conductive or other conductor; no limitation is made here.

[0052] According to one embodiment of the present invention, the conductive insert 62 includes two parts, each including two first conductive portions 621 and two second conductive portions 622. The first conductive portions 621 and the second conductive portions 622 are electrically connected through a third conductive portion 623. The portions of the two first conductive portions 621 exposed on the surface of the insulating body 61 form two first conductive pads 6211, and the portions of the two second conductive portions 622 exposed on the surface of the insulating body 61 form two second conductive pads 6221. The two first conductive pads 6211 are electrically connected to the centering support piece 43 and provide support points for the centering support piece 43. The two second... The conductive pad 6221 is electrically connected to an external power source; the first fixing part 431 is provided with two first pads 4311, which correspond one-to-one with and are electrically connected to the two first conductive pads 6211 respectively; the second fixing part 432 is provided with two second pads 4321, which are electrically connected to the two leads of the voice coil 42; the first pads 4311 and the second pads 4321 are provided one-to-one and are electrically connected; the first pads 4311 and the second pads 4321 can be electrically connected to each other through pre-embedded wires.

[0053] Please see Figure 2 , Figure 5 and Figure 6In one embodiment, the conductive insert 62 further includes a third conductive portion 623, which is embedded within the insulating body 61. One end of the third conductive portion 623 is connected to the first conductive portion 621, and the other end is connected to the second conductive portion 622. By embedding the third conductive portion 623 within the insulating body 61, the first conductive portion 621 does not need to be directly electrically connected to the second conductive portion 622 via external wiring. Instead, the electrical connection between the first conductive portion 621 and the second conductive portion 622 can be achieved through the third conductive portion 623 embedded within the insulating body 61, making it safer and more reliable. It should be noted that the first conductive portion 621, the second conductive portion 622, and the third conductive portion 623 can be silver conductive portions or copper conductive portions, and there is no limitation herein. The insulating body 61 can be a rubber body or a Teflon body, etc., and there is no limitation herein.

[0054] Please see Figures 4 to 6 In one embodiment, the insulating body 61 and the base plate 111 are integrally injection molded parts. The insulating body 61 is injection molded onto the base plate 111, so that the insulating body 61 and the magnetic yoke 11 form a whole and are assembled as a structural component, thereby simplifying the assembly process and improving the assembly efficiency and production efficiency of the sound generating device 100.

[0055] Please see Figures 4 to 6 In one embodiment, the mounting hole 15 has a clearance space to avoid the centering support piece 43; wherein, the mounting hole 15 not only accommodates the centering support piece 43, but also has a clearance space to avoid interference with the centering support piece 43.

[0056] Please see Figure 2 In one embodiment, a wiring groove 1111 is provided at one end of the base plate 111 away from the diaphragm 41. One end of the wiring groove 1111 is connected to the mounting hole 15, and the other end of the wiring groove 1111 extends to the outer edge of the base plate 111 and passes through the outer edge of the base plate 111.

[0057] The inventors discovered that, due to the fact that the existing centering support plate 43 is generally located outside the voice coil 42, one end of the centering support plate 43 is electrically connected to the voice coil 42, and the other end of the centering support plate 43 is located at the edge of the housing 2 and exposed. The exposed part needs to be connected to the flexible circuit board. At this time, the flexible circuit board can only be set on the outer periphery of the sound generating device 100, occupying the space around the sound generating device 100. As a result, the entire component occupies a large space in the electronic device, which gradually makes it difficult to meet the user's needs.

[0058] In this embodiment, a wiring groove 1111 is formed at one end of the base plate 111 away from the diaphragm 41. One end of the wiring groove 1111 is connected to the mounting hole 15, and the other end of the wiring groove 1111 extends towards the edge of the base plate 111 and passes through the edge of the square base plate 111. This allows the wiring groove 1111 to accommodate a flexible circuit board, so that the flexible circuit board does not need to occupy the space of the outer periphery of the housing 2, thereby reducing the space occupied by the sound generating device 100 and the flexible circuit board in the electronic device. The wiring groove 1111 not only accommodates the flexible circuit board, but also facilitates wiring, making it easy for the flexible circuit board to be electrically connected to an external power source. It should be noted that the number of wiring grooves 1111 can be two or more, and there is no limitation. If there are two wiring grooves 1111, the extension directions of the two wiring grooves 1111 can be the same or different, and there is no limitation. If the extension directions of the two wiring grooves 1111 are perpendicular to each other, then the extension directions of the two wiring grooves 1111 are perpendicular to the first direction, so as to meet the wiring requirements in different directions.

[0059] Please see Figure 2 and Figure 5 According to one embodiment of the present invention, a groove 611 is formed on the side of the insulating body 61 away from the diaphragm 41. The second conductive part 622 is embedded in the bottom of the groove 611 and exposed. The groove 611 communicates with the wiring groove 1111, thereby facilitating the electrical connection between the flexible circuit board and the second conductive part 622 through the wiring groove 1111 and the groove 611. This allows the connection between the second conductive part 622 and the flexible circuit board to be accommodated in the groove 611 without occupying additional space in the electronic device. In simple terms, if the original sound-generating device 100 is to be connected to the flexible circuit board, the electronic device would need to provide a larger volume than the sound-generating device 100. The large space is used for the connection between the sound-generating device 100 and the flexible circuit board. In this embodiment, the flexible circuit board is accommodated by the wiring groove 1111, and the connection between the flexible circuit board and the second conductive part 622 is accommodated by the groove 611. This allows more flexible circuit boards to be accommodated in the space originally occupied by the sound-generating device 100, or in other words, more flexible circuit boards to be accommodated, and the connection between the flexible circuit board and the second conductive part 622 to be accommodated. This effectively reduces the space occupied by the sound-generating device 100 and the flexible circuit board in the electronic device, thus better adapting to the trend of miniaturization of electronic devices.

[0060] Please see Figure 9 and Figure 10In one embodiment, the centering support 43 includes a first fixing part 431, a cantilever part 433, a bending part 434, and a second fixing part 432 connected in sequence. The first fixing part 431 is electrically connected to the first conductive part 621. The bending part 434 extends along a first direction. One side of the second fixing part 432 is connected to the diaphragm 41, and the other side of the second fixing part 432 can also be electrically connected to the wire of the voice coil 42. The first fixing part 431 is connected to the first conductive part 621, the cantilever part 433 ensures the deformation capability of the centering support 43, and the bending part 434 bends upward to ensure connection with the second fixing part 432. The upper part of the second fixing part 432 is connected to the diaphragm 41, and the lower part of the second fixing part 432 is provided with a second solder pad 4321, which is electrically connected to the wire of the voice coil 42, ensuring that the voice coil 42 can be electrically connected to an external power source.

[0061] According to one embodiment of the present invention, there are multiple cantilever portions 433, bending portions 434, and second fixing portions 432. The number of cantilever portions 433, bending portions 434, and second fixing portions 432 are consistent and arranged in a one-to-one correspondence. Multiple cantilever portions 433 are arranged sequentially at intervals along the circumference of the first fixing portion 431. Alternatively, there may be two cantilever portions 433, bending portions 434, and second fixing portions 432. The two cantilever portions 433 are arranged opposite each other at both ends of the first fixing portion 431 along the major axis or minor axis direction of the magnetic circuit system 1, which differs from conventional arrangements. Unlike the centering supports 43 at the four apex corners of the voice coil 42, in this embodiment, the two cantilever portions 433 are arranged opposite each other at both ends of the first fixed portion 431 along the long axis of the magnetic circuit system 1. The cantilever portions 433 extend along the long axis of the magnetic circuit system 1. The magnetic circuit system 1 has more space in the long axis direction than in the short axis direction, so that the length of the cantilever portion 433 can be longer than that of the traditional centering support 43, thereby giving the centering support 43 a better centering effect and making the voice coil 42 less prone to polarization during vibration.

[0062] Please see Figure 3In one embodiment, the diaphragm 41 includes a folded ring 413, a first vibrating plate 411, and a second vibrating plate 412. The folded ring 413 is spaced apart from the magnetic circuit system 1. A first through hole 4131 is provided at the center of the folded ring 413. The first vibrating plate 411 is provided corresponding to the first through hole 4131 and is connected to the folded ring 413. A centering support plate 43 is connected to the first vibrating plate 411. A second through hole 4111 is provided at the center of the first vibrating plate 411. The second vibrating plate 412 covers the second through hole 4111 and is connected to the first vibrating plate 411. The voice coil 42 is connected to the folded ring 413 or the first vibrating plate 411. The outer edge of the folded ring 413 is connected to the outer shell 2, and a first through hole 4131 is formed on the inner side of the folded ring 413. The outer edge of the first vibrating plate 411 is connected to the folded ring 413 and is set corresponding to the first through hole 4131. The side of the first vibrating plate 411 facing the magnetic circuit system 1 is connected to the second fixing part 432 to improve the stability of vibration. A second through hole 4111 is set at the center of the first vibrating plate 411, and a second vibrating plate 412 is set corresponding to the second through hole 4111. The second vibrating plate 412 is connected to the first vibrating plate 411 and covers the second through hole 4111 to ensure the vibration performance of the diaphragm 41.

[0063] Please see Figure 3 , Figure 4 and Figure 8 In one embodiment, the portion of the first vibrating plate 411 near the second through hole 4111 is provided with a boss 4112 extending toward the centering support plate 43. The boss 4112 is connected to the side of the centering support plate 43 away from the conductive support 6. The boss 4112 is connected to the cantilever portion 433, which increases the contact area between the centering support plate 43 and the diaphragm 41, improves the stability of the connection between the centering support plate 43 and the diaphragm 41, and enhances the consistency of vibration of each component of the vibration system 4.

[0064] Please see Figure 3 and Figure 5 In one embodiment, the central magnetic circuit 12 includes a central magnet 121 and a central magnetic guide plate 122 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 side of the central magnetic guide plate 122 away from the central magnet 121 is provided with a first clearance groove 1221 for avoiding the wires of the voice coil 42. By providing 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. It should be noted that a second clearance groove 1222 is formed on the side of the central magnetic guide plate 122 away from the central magnet 121 to avoid the first vibrating plate 411. The second clearance groove 1222 communicates with the first clearance groove 1221, and both the first clearance groove 1221 and the second clearance groove 1222 communicate with the mounting hole 15.

[0065] 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.

[0066] 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 producing device, characterized by, include: A magnetic circuit system includes a magnetic yoke, a central magnetic circuit and side magnetic circuits disposed on the magnetic yoke, the side magnetic circuits including two side magnets extending along the long axis of the magnetic circuit system and located on opposite sides of the central magnetic circuit, the magnetic yoke including a base plate and two side plates connected to the base plate, the two side plates being located at both ends of the base plate along the long axis of the magnetic circuit system, the side magnetic circuits and the side plates surrounding the central magnetic circuit and being spaced apart from the central magnetic circuit to form a magnetic gap; The outer casing has a connecting hole; The mesh covers the connecting hole. The outer shell, the mesh, and the magnetic yoke are integrally injection molded parts. The mesh and the side plate are spaced apart to form an airflow channel. The airflow channel connects the external environment and the cavity inside the side plate through the mesh. A vibration system, comprising a diaphragm and a voice coil connected to the diaphragm and driving the diaphragm to vibrate in a first direction, the voice coil being disposed corresponding to the magnetic gap.

2. The sound-generating device as described in claim 1, characterized in that, The outer shell comprises two, and the two outer shells are integrally injection molded with the two side plates respectively.

3. The sound-generating device as described in claim 2, characterized in that, The sound-generating device further includes a bracket, which includes two short shaft segments and two long shaft segments respectively disposed at both ends of the short shaft segments and respectively connected to the two short shaft segments. The outer edge of the diaphragm is connected to one end of the bracket, the end of the short shaft segment away from the diaphragm is connected to the outer shell, and the end of the long shaft segment away from the diaphragm is connected to the side magnetic circuit.

4. The sound-generating device as described in claim 3, characterized in that, The bracket is made of metal and is welded to the edge magnetic circuit; And / or, the bracket also has a corner segment connecting the long axis segment and the short axis segment, the corner segment being connected to the housing, the corner segment having a protrusion extending toward the housing, and the housing having a matching recess.

5. The sound-generating device as described in claim 1, characterized in that, The sound-generating device further includes a conductive support, and the vibration system further includes a centering support plate. The magnetic circuit system has a mounting hole that passes through the central magnetic circuit and the magnetic yoke. The conductive support plate is embedded in the mounting hole. One end of the centering support plate is electrically connected to the conductive support plate, and the other end of the centering support plate is connected to the diaphragm and electrically connected to the conductor of the voice coil and the centering support plate.

6. The sound-generating device as described in claim 5, characterized in that, The conductive support includes an insulating body and a conductive insert disposed on the insulating body. The insulating body is connected to the base plate. The conductive insert includes a first conductive portion and a second conductive portion exposed on both sides of the insulating body along the first direction. The first conductive portion and the second conductive portion are electrically connected. The first conductive portion is disposed toward the centering support piece and is electrically connected to the centering support piece. The second conductive portion is used to be electrically connected to an external power source.

7. The sound-generating device as described in claim 6, characterized in that, The conductive insert further includes a third conductive portion, which is embedded in the insulating body. One end of the third conductive portion is connected to the first conductive portion, and the other end of the third conductive portion is connected to the second conductive portion. And / or, the insulating body and the base plate are integrally injection molded parts.

8. The sound-generating device as described in claim 5, characterized in that, The mounting hole has clearance space to avoid the centering support piece; And / or, a wiring groove is provided at one end of the base plate away from the diaphragm, one end of the wiring groove is connected to the mounting hole, and the other end of the wiring groove extends toward the outer edge of the base plate and passes through the outer edge of the base plate.

9. The sound-generating device as described in claim 6, characterized in that, The centering support includes a first fixing part, a cantilever part, a bending part, and a second fixing part connected in sequence. The first fixing part is electrically connected to the first conductive part. The bending part extends along the first direction. One side of the second fixing part is connected to the diaphragm, and the other side of the second fixing part can also be electrically connected to the wire of the voice coil.

10. The sound-generating device as claimed in claim 5, characterized in that, The diaphragm includes a folded ring, a first diaphragm plate, and a second diaphragm plate. The folded ring is spaced apart from the magnetic circuit system. A first through hole is provided at the center of the folded ring. The first diaphragm plate is provided corresponding to the first through hole and is connected to the folded ring. The centering support plate is connected to the first diaphragm plate. A second through hole is provided at the center of the first diaphragm plate. The second diaphragm plate covers the second through hole and is connected to the first diaphragm plate. The voice coil is connected to the folded ring or the first diaphragm plate.

11. The sound-generating device as claimed in claim 10, characterized in that, The first vibrating plate has a boss extending toward the centering support plate near the second through hole. The boss is connected to the side of the centering support plate away from the conductive support.

12. The sound-generating device according to any one of claims 1 to 11, characterized in that, The central magnetic circuit includes a central magnet and a central magnetic guide plate stacked together. The side of the central magnet away from the central magnetic guide plate is connected to the magnetic guide yoke. The side of the central magnetic guide plate away from the central magnet is provided with a first clearance groove for avoiding the wire of the voice coil.

13. An electronic device, characterized in that, The electronic device includes a sound-generating device as described in any one of claims 1 to 12.

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