Sound-producing apparatus and electronic device

Abstract

The present invention relates to the technical field of electroacoustic transduction, and disclosed are a sound-producing apparatus and an electronic device. A magnetic yoke of a magnetic circuit system of the sound-producing apparatus is integrally injection-molded with an injection-molded support. The injection-molded support is provided with a first through hole. A first magnetic gap is formed between a central magnetic portion and the magnetic yoke. The central magnetic portion is provided with a second through hole. A second magnetic gap arranged around the first magnetic gap is formed between a side magnetic portion and the magnetic yoke. A first diaphragm and a second diaphragm of a vibration system are located on two opposite sides of the magnetic circuit system. An inner peripheral edge of the second diaphragm is connected to the injection-molded support and is provided with a third through hole. A first voice coil and a second voice coil are suspended in the first magnetic gap and the second magnetic gap, respectively. The sound-producing apparatus of the present invention not only reduces the risk of drop-induced reliability issues and improves the structural robustness of the product, but also effectively improves high-frequency performance.

Description

Sound-generating devices and electronic equipment Technical Field

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

[0002] In recent years, with the rapid development of consumer electronics, electronic devices such as headphones, smartphones, and VR devices have gained consumer acceptance and widespread application. Those skilled in the art have also made corresponding improvements to related supporting products, such as headphones, to meet the performance requirements of electronic products and satisfy consumers' needs for product performance.

[0003] Sound-generating devices are crucial electroacoustic transducers in consumer electronics, widely used as speakers, earpieces, and headphones. With advancements in electronic product performance, improving the acoustic performance of sound-generating devices is an inevitable trend. One proposed sound-generating device features a magnetic circuit system with a first and a second diaphragm on opposite sides. The magnetic circuit system includes an integrally stretched magnetic yoke. A central magnet and side magnets are mounted on different support walls of the yoke. The inner periphery of one diaphragm is also fixed to the top wall of the yoke. While this structure can improve the acoustic performance of the sound-generating device, it is a relatively limited design. The bonding area between the magnets and the yoke, and between the diaphragm and the yoke, is small, leading to a high risk of product reliability issues and significantly impacting product lifespan. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-generating device and an electronic device, which aims to provide a sound-generating device that effectively improves high-frequency performance. This sound-generating device not only reduces the risk of drop reliability and improves the structural robustness of the product, but also effectively improves high-frequency performance, thereby enhancing the overall sound-generating performance of the device.

[0005] To achieve the above objectives, the present invention provides a sound-generating device, the sound-generating device comprising:

[0006] shell;

[0007] A magnetic circuit system, comprising a central magnetic part, a side magnetic part, a magnetically conductive yoke, and an injection-molded bracket. The inner edge of the magnetically conductive yoke is integrally injection-molded with the injection-molded bracket. The injection-molded bracket has a first through hole. The central magnetic part is connected to the magnetically conductive yoke and the injection-molded bracket, forming a first magnetic gap with the magnetically conductive yoke. The central magnetic part has a second through hole corresponding to and communicating with the first through hole. The side magnetic part is connected to the magnetically conductive yoke, forming a second magnetic gap with the magnetically conductive yoke. The second magnetic gap surrounds the first magnetic gap.

[0008] A vibration system includes a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil. The first diaphragm and the second diaphragm are located on opposite sides of the magnetic circuit system. The outer periphery of the first diaphragm is connected to the outer shell and is opposite to and spaced from the magnetic circuit system. The outer periphery of the second diaphragm is connected to the outer shell, and the inner periphery of the second diaphragm is connected to the injection-molded bracket. The inner periphery of the second diaphragm is provided with a third through hole communicating with the first through hole. One end of the first voice coil is connected to the first diaphragm, and the other end of the first voice coil is suspended in the first magnetic gap. One end of the second voice coil is connected to the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap.

[0009] In one embodiment, the magnetic yoke includes a first top plate, a first bottom plate, and a first side plate connecting the first top plate and the first bottom plate. The end of the first bottom plate away from the first side plate is connected to the outer shell, and the inner periphery of the first top plate is integrally injection molded with the injection-molded bracket.

[0010] The central magnetic part is located on the side of the first top plate and the injection molding bracket near the first bottom plate, and is spaced apart from the first side plate to form the first magnetic gap. The side magnetic part is located on the side of the first bottom plate near the first top plate, and is spaced apart from the first side plate to form the second magnetic gap.

[0011] In one embodiment, the injection-molded bracket is provided with a first embedding groove, and the inner periphery of the first top plate is provided with a first embedding part, which is embedded in the first embedding groove.

[0012] And / or, the side of the injection-molded bracket facing the central magnet is flush with the side of the first top plate facing the central magnet;

[0013] And / or, the injection-molded bracket protrudes from the side of the first top plate opposite to the central magnet on the side opposite to the central magnet, and is connected to the inner periphery of the second diaphragm;

[0014] And / or, the first base plate is provided with an avoidance groove corresponding to the second magnetic gap, and the avoidance groove extends inward in a direction away from the second voice coil;

[0015] And / or, the first top plate and the first bottom plate are connected to both ends of the first side plate along the vibration direction of the vibration system;

[0016] And / or, the magnetic yoke is integrally stretched to form the first bottom plate, the first side plate, and the first top plate connected in sequence;

[0017] And / or, the central magnetic part includes a central magnet and a central magnetic guide plate stacked together, the central magnet being connected to the first top plate and the injection molding bracket, and the second through hole sequentially penetrating the central magnetic guide plate and the central magnet.

[0018] In one embodiment, the outer casing includes a first casing and a second casing connected together. The end of the first casing away from the second casing is connected to the outer side of the first diaphragm, and the side of the second casing opposite to the first casing is connected to the outer periphery of the second diaphragm. The outer periphery of the magnetic yoke is connected to the first casing.

[0019] In one embodiment, the first housing is a plastic housing;

[0020] The outer periphery of the magnetic yoke is integrally injection molded with the first housing; wherein, the first housing is provided with a second embedding groove, the outer periphery of the magnetic yoke is provided with a second embedding part, and the second embedding part is embedded in the second embedding groove; or, the inner wall of the first housing is provided with a support platform, the outer periphery of the magnetic yoke is supported on the support platform, and is bonded to the support platform.

[0021] And / or, the edge magnetic part includes an edge magnet and an edge magnetic plate stacked together, the edge magnet is connected to the magnetic yoke, and the edge magnetic plate and the second housing are integrally formed.

[0022] In one embodiment, the first diaphragm includes a folded ring portion and a dome, the folded ring portion is disposed around the dome, the outer edge of the folded ring portion is connected to the housing, the first voice coil is connected to the dome, and the second through hole, the first through hole and the third through hole are sequentially connected to form a through hole;

[0023] Wherein, the outer contour of the dome is circular, the through hole is a circular hole, the diameter of the dome is defined as D1, the diameter of the through hole is defined as D2, and D2≥0.3D1; or, the projected area of ​​the through hole along the vibration direction of the vibration system is defined as S1, and the projected area of ​​the dome along the vibration direction of the vibration system is defined as S2, and S1≥8.5%*S2.

[0024] In one embodiment, the second diaphragm includes an inner folded ring, a vibrating part, and an outer folded ring connected in sequence. The inner folded ring has the third through hole on its inner side and is connected to the injection-molded bracket. The outer side of the outer folded ring is connected to the outer shell. The second voice coil is connected to the vibrating part.

[0025] The second diaphragm further includes a vibrating plate, which is disposed between the vibrating part and the second voice coil.

[0026] In one embodiment, the first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves of the same phase outward;

[0027] And / or, the second diaphragm is an annular diaphragm, the inner edge of the second diaphragm forms the third through hole, and the sound-generating device further includes a first venting member, the first venting member being connected to the inner edge of the first diaphragm and covering the third through hole;

[0028] And / or, a first cavity is formed between the second diaphragm, the outer shell, the magnetic yoke and the injection-molded bracket, the sound-generating device is provided with a first leakage hole connecting the first cavity and the outside, and the sound-generating device further includes a second ventilator covering the first leakage hole.

[0029] In one embodiment, the sound-generating device further includes a first support ring disposed between the outer periphery of the first diaphragm and the outer shell;

[0030] And / or, the sound-generating device further includes a second support ring, which is disposed between the outer periphery of the second diaphragm and the outer shell;

[0031] And / or, the sound-generating device further includes a front cover, the front cover being located on the side of the first diaphragm away from the second diaphragm, a second cavity being formed between the first diaphragm and the front cover, and the front cover having a fourth through hole communicating with the second cavity and the outside.

[0032] The present invention also proposes an electronic device, the electronic device comprising:

[0033] Equipment housing, the equipment housing having a receiving cavity; and

[0034] The aforementioned sound-generating device is disposed within the receiving cavity, which divides the receiving cavity into a mutually isolated front cavity and a rear cavity;

[0035] The device housing is provided with a sound outlet hole that connects to the front cavity, and the sound waves of the first and second diaphragms of the sound-generating device are radiated to the outside through the sound outlet hole.

[0036] The sound-generating device of this invention houses a magnetic circuit system and a vibration system within a housing. A first magnetic gap and a second magnetic gap are provided on the magnetic circuit system, with the second magnetic gap surrounding the first magnetic gap. The vibration system comprises a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil. The first and second diaphragms are respectively located on opposite sides of the magnetic circuit system and connected to the housing. One end of the first voice coil is connected to the first diaphragm, and the other end is suspended within the first magnetic gap. One end of the second voice coil is connected to the second diaphragm, and the other end is suspended within the second magnetic gap. Thus, the first and second voice coils... A current is passed through the voice coil, causing the first and second voice coils to convert electrical energy into mechanical energy within the first and second magnetic gaps formed by the magnetic circuit system, respectively. This mechanical energy drives the first and second voice coils to vibrate the first and second diaphragms, respectively. This not only achieves sound production by driving the two diaphragms driven by two voice coils through a single magnetic circuit system, but also achieves co-directional sound production from both diaphragms without increasing the overall dimensions, and increases the vibration area of ​​the vibration system, thereby improving performance. Furthermore, by configuring the magnetic circuit system as a central magnetic part, a side magnetic part, a magnetic yoke, and an injection-molded support, and by connecting the inner edge of the magnetic yoke to the injection-molded support... The frame is integrally injection molded, allowing the central magnet to connect to the magnetic yoke and the injection-molded bracket, forming a first magnetic gap with the yoke. The side magnet is connected to the magnetic yoke, forming a second magnetic gap with it. The injection-molded bracket connects and fixes the inner periphery of the second diaphragm. This not only increases the connection area with the second diaphragm but also increases the bonding area of ​​the central magnet by simultaneously fixing the central magnet with the magnetic yoke and the injection-molded bracket, thus improving installation stability and reducing reliability risks. Furthermore, the injection-molded bracket has a first through hole, and the central magnet has a second through hole corresponding to and communicating with the first through hole. The inner periphery is provided with a third through hole that connects to the first through hole. This allows the first diaphragm to radiate sound waves outward through the second through hole, the first through hole, and the third through hole in sequence. This enables the sound waves of the first and second diaphragms to radiate outward on the same side of the sound-generating device. This facilitates the superposition of compressed air when the first and second diaphragms vibrate, thereby improving the loudness and sensitivity of the sound-generating device. Furthermore, the airflow channel formed by the sequential connection of the second, first, and third through holes effectively increases the airflow area when the first diaphragm vibrates, thus ensuring smoother airflow and improving the high-frequency performance of the first diaphragm. This, in turn, improves the high-frequency performance of the superimposed first and second diaphragms. Attached Figure Description

[0037] 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.

[0038] Figure 1 is a structural schematic diagram of an embodiment of the sound-generating device provided by the present invention;

[0039] Figure 2 is a cross-sectional schematic diagram of an embodiment of the sound-generating device provided by the present invention;

[0040] Figure 3 is an exploded view of an embodiment of the sound-generating device provided by the present invention;

[0041] Figure 4 is an exploded view of another embodiment of the sound-generating device provided by the present invention;

[0042] Figure 5 is a schematic diagram of the integrated structure of the first housing, magnetic yoke and injection molded bracket in one embodiment of the present invention;

[0043] Figure 6 is a cross-sectional schematic diagram of an integrated structure of the first housing, magnetic yoke, and injection-molded bracket in one embodiment of the present invention;

[0044] Figure 7 is a cross-sectional schematic diagram of the connection between the first housing, the magnetic yoke and the injection-molded bracket in another embodiment of the present invention;

[0045] Figure 8 is a schematic diagram of the integrated structure of the magnetic yoke and injection-molded bracket in one embodiment of the present invention.

[0046] Reference numerals in the attached figures: 100, Sound-generating device; 1, Outer shell; 11, First housing; 111, Second embedding groove; 112, Support platform; 12, Second housing; 121, First leakage hole; 13, First cavity; 2, Magnetic circuit system; 21, Magnetic yoke; 211, First top plate; 2111, First embedding part; 212, First bottom plate; 2121, Clearance groove; 2122, Second embedding part; 213, First side plate; 22, Central magnetic part; 221, Central magnet; 222, Central magnetic guide plate; 223, Second through hole; 23, Side magnetic part; 231, Side magnet; 232, Side magnetic guide plate; 24 1. Injection-molded bracket; 241. First through hole; 242. First embedded groove; 25. First magnetic gap; 26. Second magnetic gap; 3. Vibration system; 31. First diaphragm; 311. Folded ring; 312. Dome; 32. Second diaphragm; 321. Inner folded ring; 322. Vibrating part; 323. Outer folded ring; 324. Third through hole; 325. Vibrating plate; 33. First voice coil; 34. Second voice coil; 4. Through hole; 51. First support ring; 52. Second support ring; 61. First vent; 62. Second vent; 7. Front cover; 71. Second cavity; 72. Fourth through hole.

[0047] 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

[0048] 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.

[0049] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0050] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0051] Furthermore, in this invention, descriptions involving "first," "second," etc., 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. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0052] This invention proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applied to electronic devices, such as mobile phones, headphones, smart wearable devices, etc., and is not limited thereto.

[0053] Referring to Figures 1 to 8, in this embodiment of the invention, the sound-generating device 100 includes a housing 1, a magnetic circuit system 2, and a vibration system 3. The magnetic circuit system 2 includes a central magnetic part 22, a side magnetic part 23, a magnetic yoke 21, and an injection-molded support 24. The inner edge of the magnetic yoke 21 is integrally injection-molded with the injection-molded support 24. The injection-molded support 24 has a first through hole 241. The central magnetic part 22 is connected to the magnetic yoke 21 and the injection-molded support 24, forming a first magnetic gap 25 between it and the magnetic yoke 21. The central magnetic part 22 has a second through hole 223 corresponding to and communicating with the first through hole 241. The side magnetic part 23 is connected to the magnetic yoke 21, forming a second magnetic gap 26 between it and the magnetic yoke 21. The second magnetic gap 26 surrounds the first magnetic gap 25. The vibration system 3 includes a first diaphragm 31, a second diaphragm 32, a first voice coil 33, and a second voice coil 34. The first diaphragm 31 and the second diaphragm 32 are located on opposite sides of the magnetic circuit system 2. The outer periphery of the first diaphragm 31 is connected to the outer shell 1 and is opposite to and spaced from the magnetic circuit system 2. The outer periphery of the second diaphragm 32 is connected to the outer shell 1, and the inner periphery of the second diaphragm 32 is connected to the injection-molded bracket 24. The inner periphery of the second diaphragm 32 is provided with a third through hole 324 that connects to the first through hole 241. One end of the first voice coil 33 is connected to the first diaphragm 31, and the other end of the first voice coil 33 is suspended in the first magnetic gap 25. One end of the second voice coil 34 is connected to the second diaphragm 32, and the other end of the second voice coil 34 is suspended in the second magnetic gap 26.

[0054] In this embodiment, the sound-generating device 100 can be a single unit of a loudspeaker, and the loudspeaker can be a miniature loudspeaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 are arranged opposite to each other.

[0055] Understandably, the outer casing 1 is used to install, fix, and support components such as the magnetic circuit system 2 and the vibration system 3; that is, the outer casing 1 provides a mounting base for components such as the magnetic circuit system 2 and the vibration system 3. Optionally, the outer casing 1 can be a single integral structure or formed by the cooperation of multiple separate structures; no limitation is made here.

[0056] In this embodiment, the outer shell 1 can be a frame or a frame structure, that is, the outer shell 1 has a cavity with openings at both ends. The magnetic circuit system 2 is housed in the cavity of the outer shell 1 and connected to the outer shell 1. The first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are respectively disposed on opposite sides of the magnetic circuit system 2, and the outer periphery of the first diaphragm 31 and the outer periphery of the second diaphragm 32 are respectively connected to the two ends of the outer shell 1, thus forming a double diaphragm structure. The two diaphragms of the two voice coils of the vibration system 3 are driven to vibrate by one magnetic circuit system 2 to produce sound. At the same time, the double diaphragms produce sound in the same direction without increasing the external size, and the vibration area of ​​the vibration system 3 is increased, thereby achieving the purpose of performance improvement.

[0057] In this embodiment, the outer casing 1 is provided with conductive terminals, and both the first voice coil 33 and the second voice coil 34 are electrically connected to the conductive terminals. This allows the sound-generating device 100 to easily connect and conduct the first voice coil 33 and the second voice coil 34 to an external circuit via the conductive terminals.

[0058] It should be noted that the sound-generating device 100 has a first side and a second side that are opposite to each other. The first side refers to the side of the second diaphragm 32 that is away from the first diaphragm 31, and the second side refers to the side of the first diaphragm 31 that is away from the second diaphragm 32. The first side and the second side can be understood as orientation or direction.

[0059] In this embodiment, the sound waves from the first diaphragm 31 radiate outward through the second through-hole 223, the first through-hole 241, and the third through-hole 324. Furthermore, the sound waves from the first diaphragm 31 and the second diaphragm 32 radiate outward on the same side of the sound-generating device 100. That is, the sound waves from the first side of the first diaphragm 31 radiate outward through the second through-hole 223, the first through-hole 241, and the third through-hole 324, and the sound waves from the first sides of the first diaphragm 31 and the second diaphragm 32 radiate outward on the same side of the sound-generating device 100. This allows the sound waves from the first diaphragm 31 and the second diaphragm 32 in the vibration system 3 to be superimposed to produce sound, thereby improving the sound generation effect and performance.

[0060] Optionally, the first diaphragm 31 and the second diaphragm 32 vibrate in the same direction and radiate sound waves of the same phase outward, thereby increasing the volume of the sound-generating device 100.

[0061] In this embodiment, the outer casing 1 is used to house structures such as the fixed vibration system 3 and the magnetic circuit system 2, so that the sound-generating device 100 can be used as an independent component in electronic devices or sound-generating modules, which is not limited here. It is understood that the outer contour of the sound-generating device 100 can be circular or square, so that the outer contours of the outer casing 1, the magnetic circuit system 2 and the vibration system 3 are correspondingly set to be circular or square, which is designed according to actual needs and is not limited here.

[0062] Optionally, the outer shell 1 has a cylindrical structure, that is, the outer shell 1 has openings at both ends, forming a circular cylinder with openings at both ends. The outer periphery contours of the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are roughly aligned and similar to the outer contour of the outer shell 1. The first diaphragm 31 and the second diaphragm 32 are respectively connected to the openings at both ends of the outer shell 1. The magnetic circuit system 2, etc., are disposed in the cavity of the outer shell 1 and located between the first diaphragm 31 and the second diaphragm 32. This facilitates the regularization of the shape of the sound generating device 100, further facilitates its assembly into the whole machine, and simplifies the reserved structure of the whole machine.

[0063] In this embodiment, as shown in Figures 1 to 7, the outer shell 1 includes a first shell 11 and a second shell 12 connected to each other. The end of the first shell 11 away from the second shell 12 is connected to the outer side of the first diaphragm 31. The side of the second shell 12 facing away from the first shell 11 is connected to the outer periphery of the second diaphragm 32. The outer periphery of the magnetic yoke 21 is connected to the first shell 11.

[0064] Understandably, the first housing 11 and the second housing 12 of the outer casing 1 can optionally be cylindrical, allowing the first housing 11 and the second housing 12 to be fitted and connected to form the cylindrical outer casing 1. By designing the outer casing 1 as a separate first housing 11 and second housing 12, the first diaphragm 31 can be assembled through the first housing 11, and the second diaphragm 32 can be assembled through the second housing 12, facilitating the assembly of the sound-generating device 100 during the assembly process. In this embodiment, the first housing 11 and the second housing 12 of the outer casing 1 are respectively provided with conductive terminals, thereby facilitating the electrical connection of the first voice coil 33 and the second voice coil 34 to external circuits, etc.

[0065] In this embodiment, the magnetic circuit system 2 is configured as a central magnetic part 22, a side magnetic part 23, a magnetic yoke 21, and an injection-molded bracket 24. The injection-molded bracket 24 is integrally injection-molded onto the inner edge of the magnetic yoke 21. The central magnetic part 22 is fixed by the cooperation of the magnetic yoke 21 and the injection-molded bracket 24, forming a first magnetic gap 25 between the central magnetic part 22 and the magnetic yoke 21. The side magnetic part 23 is fixed by the magnetic yoke 21, forming a second magnetic gap 26 between the side magnetic part 23 and the magnetic yoke 21. The side magnetic part 23 is located outside the central magnetic part 22, and the second magnetic gap 26 surrounds the first magnetic gap 25. This facilitates the first voice coil 33 and the second voice coil 34 of the vibration system 3 to respectively connect with the first magnetic gap 25 and the second magnetic gap 25. Corresponding to the magnetic gap 26, conductive terminals are provided on the outer casing 1, so that the first voice coil 33 and the second voice coil 34 are electrically connected to the conductive terminals. In this way, current is passed through the first voice coil 33 and the second voice coil 34, so that the first voice coil 33 and the second voice coil 34 convert electrical energy into mechanical energy in the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2, respectively, to drive the first voice coil 33 and the second voice coil 34 to drive the first diaphragm 31 and the second diaphragm 32 to vibrate. Not only does it achieve sound production by driving two voice coils to drive two diaphragms to vibrate through a magnetic circuit system 2, but it also achieves sound production of both diaphragms in the same direction without increasing the external size, and increases the vibration area of ​​the vibration system 3, thereby achieving the purpose of performance improvement.

[0066] To achieve sound waves from the first side of the first diaphragm 31 and the second diaphragm 32 radiating outwards from the same side of the sound-generating device 100, and to enhance the high-frequency performance by superimposing and reinforcing the sound waves, this embodiment uses an injection molding process where the inner edge of the magnetic yoke 21 is integrally injection molded with the injection-molded bracket 24. The injection-molded bracket 24 has a first through-hole 241, and the central magnetic part 22 has a second through-hole 223 corresponding to and communicating with the first through-hole 241. The inner periphery of the second diaphragm 32 is connected to the injection-molded bracket 24, and a third through-hole 324 communicating with the first through-hole 241 is provided on the inner periphery of the second diaphragm 32. This allows the sound waves from the first side of the first diaphragm 31 to radiate outwards sequentially through the second through-hole 223, the first through-hole 241, and the third through-hole 324. In other words, the second through-hole 223, the first through-hole 241, and the third through-hole 324 are sequentially connected to form an airflow channel, thus achieving the desired high-frequency performance. The sound waves of the second diaphragm 32 radiate outward from the same side of the sound-generating device 100, which is beneficial for the superposition of compressed air when the first diaphragm 31 and the second diaphragm 32 vibrate, thereby improving the loudness and sensitivity of the sound-generating device 100. At the same time, the second diaphragm 32 and the central magnet 22 are installed and fixed by the injection-molded bracket 24 and the magnetic yoke 21 respectively, so as to improve the installation stability and reduce the reliability risk. Furthermore, the airflow channel formed by the second through hole 223, the first through hole 241 and the third through hole 324 effectively increases the airflow area when the first diaphragm 31 vibrates, thereby ensuring smoother airflow and improving the high-frequency performance of the first diaphragm 31, thereby improving the high-frequency performance of the superposition of the first diaphragm 31 and the second diaphragm 32.

[0067] The sound-generating device 100 of the present invention houses a magnetic circuit system 2 and a vibration system 3 within a housing 1. A first magnetic gap 25 and a second magnetic gap 26 are provided on the magnetic circuit system 2, such that the second magnetic gap 26 surrounds the first magnetic gap 25. The vibration system 3 comprises a first diaphragm 31, a second diaphragm 32, a first voice coil 33, and a second voice coil 34. The first diaphragm 31 and the second diaphragm 32 are respectively located on opposite sides of the magnetic circuit system 2 and connected to the housing 1. One end of the first voice coil 33 is connected to the first diaphragm 31, and the other end of the first voice coil 33 is suspended within the first magnetic gap 25. One end of the second voice coil 34 is connected to the second diaphragm 32. The other end of the second voice coil 32 is suspended in the second magnetic gap 26. In this way, current is passed through the first voice coil 33 and the second voice coil 34, so that the first voice coil 33 and the second voice coil 34 convert electrical energy into mechanical energy in the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2, respectively. This drives the first voice coil 33 and the second voice coil 34 to vibrate the first diaphragm 31 and the second diaphragm 32, respectively. This not only drives the two diaphragms of the two voice coils to vibrate through a magnetic circuit system 2 to produce sound, but also achieves sound production of the two diaphragms in the same direction without increasing the size of the external structure. It also increases the vibration area of ​​the vibration system 3, thereby achieving the purpose of performance improvement.Furthermore, by configuring the magnetic circuit system 2 as a central magnetic part 22, a side magnetic part 23, a magnetic yoke 21, and an injection-molded bracket 24, and integrally injection molding the inner edge of the magnetic yoke 21 with the injection-molded bracket 24, the central magnetic part 22 is connected to the magnetic yoke 21 and the injection-molded bracket 24, forming a first magnetic gap 25 between the central magnetic part 22 and the magnetic yoke 21. The side magnetic part 23 is connected to the magnetic yoke 21, forming a second magnetic gap 26 between the side magnetic part 23 and the magnetic yoke 21. The injection-molded bracket 24 is used to connect and fix the inner periphery of the second diaphragm 32. In this way, the injection-molded bracket 24 not only increases the connection area with the second diaphragm 32, but also uses the magnetic yoke 21 and the injection-molded bracket 24 to fix the central magnetic part 22, thereby increasing the bonding area of ​​the central magnet 221, improving installation stability, and reducing reliability risks. Moreover, by providing a first through hole 241 in the injection-molded bracket 24, the central magnetic part 22 is provided with... A second through-hole 223 corresponding to and connected to the first through-hole 241 is provided, and a third through-hole 324 connected to the first through-hole 241 is provided on the inner periphery of the second diaphragm 32. This allows the first diaphragm 31 to radiate sound waves outwards through the second through-hole 223, the first through-hole 241, and the third through-hole 324 in sequence, achieving sound wave radiation from both the first and second diaphragms 31 and 32 on the same side of the sound-generating device 100. This facilitates the superposition of compressed air during the vibration of the first and second diaphragms 31 and 32, improving the loudness and sensitivity of the sound-generating device 100. Furthermore, the airflow channel formed by the sequential connection of the second through-hole 223, the first through-hole 241, and the third through-hole 324 effectively increases the airflow area during the vibration of the first diaphragm 31, ensuring smoother airflow and improving the high-frequency performance of the first diaphragm 31, thereby enhancing the high-frequency performance of the superimposed first and second diaphragms 32.

[0068] In this embodiment, the magnetic yoke 21 is a metal magnetic plate. Optionally, the injection-molded bracket 24 is a plastic part. It is understood that the injection-molded bracket 24 and the magnetic yoke 21 can be integrally injection molded, and this is not limited here.

[0069] The sound-generating device 100 of the present invention can be used in various environments. In one embodiment, the first diaphragm 31 and the second diaphragm 32 can be selected to vibrate in the same direction. The first side of the first diaphragm 31 and the second diaphragm 32 radiates a first sound wave to the external environment, and the second side of the first diaphragm 31 and the second diaphragm 32 radiates a second sound wave to the external environment. The first sound wave and the second sound wave are out of phase. In this way, both the first side and the second side of the sound-generating device 100 are in communication with the external environment, and the first side and the second side radiate sound waves with opposite phases to the external environment. The sound waves on both sides cancel each other out in the far field, which is suitable for environments that require far-field noise reduction and privacy protection.

[0070] In one embodiment, the sound-generating device 100 is applied to an electronic device and is used to divide the space of the electronic device into an acoustically isolated front cavity and a rear cavity. The first side of the first diaphragm 31 and the second diaphragm 32 are connected to the front cavity, and the second side of the first diaphragm 31 and the second diaphragm 32 are connected to the rear cavity. The first diaphragm 31 and the second diaphragm 32 vibrate in the same direction and radiate a first sound wave to the front cavity and a second sound wave to the rear cavity. The first sound wave and the second sound wave are out of phase.

[0071] Understandably, electronic devices typically have an outlet for the front cavity sound waves to radiate and a rear leakage hole connecting to the rear cavity. When using the electronic device, the front cavity sound waves can be radiated out through the outlet and received by the user. Furthermore, the rear cavity sound waves can optionally radiate out through the rear leakage hole. In this way, the front and rear cavity sound waves can form an acoustic dipole, achieving the technical effect of reducing sound leakage. Alternatively, the rear cavity sound waves may not radiate outwards. In this invention, the sound-generating device 100 only serves to enhance the high-frequency performance by superimposing the sound waves from the first side of the first diaphragm 31 and the second diaphragm 32. The appropriate method can be chosen based on the actual situation.

[0072] In one embodiment, the second diaphragm 32 is an annular diaphragm, and a third through hole 324 is formed on the inner edge of the second diaphragm 32. The sound generating device 100 also includes a first ventilator 61, which is connected to the inner edge of the first diaphragm 31 and covers the third through hole 324.

[0073] In this embodiment, as shown in Figures 2 to 4, the second diaphragm 32 can be selected as an annular diaphragm. In this case, a third through hole 324 is formed on the inner edge of the second diaphragm 32. That is, a third through hole 324 is formed on the inner edge of the second diaphragm 32. It can be understood that by providing the first venting member 61, the first venting member 61 is connected to the inner edge of the second diaphragm 32 and covers the third through hole 324. In this way, the first venting member 61 prevents external dust or impurities from entering the interior of the sound-generating device 100, thereby avoiding affecting the acoustic performance of the sound-generating device 100.

[0074] In one embodiment, a first cavity 13 is formed between the second diaphragm 32, the outer shell 1, the magnetic yoke 21 and the injection-molded bracket 24. The sound-generating device 100 is provided with a first leakage hole 121 that connects the first cavity 13 with the outside. The sound-generating device 100 also includes a second ventilator 62 that covers the first leakage hole 121.

[0075] In this embodiment, as shown in FIG2, the second diaphragm 32, the outer shell 1, the magnetic yoke 21, and the injection-molded bracket 24 of the vibration system 3 enclose a first cavity 13, which may be a sealed cavity. To balance the air pressure within the first cavity 13 and improve the vibration balance of the second diaphragm 32, a first leakage hole 121 connecting the first cavity 13 to the outside is provided on the sound-generating device 100. This allows for air release, adjusting the air pressure within the first cavity 13, balancing the air pressure on both sides of the second diaphragm 32, and improving the vibration stability of the second diaphragm 32.

[0076] Optionally, the first leakage hole 121 includes multiple holes. In this embodiment, the multiple first leakage holes 121 are symmetrically arranged circumferentially around the sound-generating device 100. In this way, the first leakage holes 121 are used to balance the air pressure in the first cavity 13, thereby improving the vibration balance of the second diaphragm 32.

[0077] In this embodiment, by providing a second venting element 62 on the first leakage hole 121 and covering the first leakage hole 121 with the second venting element 62, on the one hand, external dust or impurities can be prevented from entering the interior of the sound-generating device 100, thereby avoiding affecting the acoustic performance of the sound-generating device 100; on the other hand, the airflow velocity of the first cavity 13 can be further adjusted, the air pressure of the first cavity 13 can be adjusted, the air pressure on both sides of the second diaphragm 32 can be balanced, and the vibration stability of the second diaphragm 32 can be improved.

[0078] Optionally, a first leakage hole 121 is provided between the first housing 11 and the second housing 12 of the outer shell 1, and a second venting element 62 is provided at the first leakage hole 121. This can further adjust the airflow velocity in the cavity of the sound-generating device 100, adjust the acoustic impedance, and thus improve the performance of the sound-generating device 100.

[0079] In one embodiment, the magnetic yoke 21 includes a first top plate 211, a first bottom plate 212, and a first side plate 213 connecting the first top plate 211 and the first bottom plate 212. The end of the first bottom plate 212 away from the first side plate 213 is connected to the outer shell 1. The inner periphery of the first top plate 211 is integrally injection molded with the injection molded bracket 24. The central magnetic part 22 is disposed on the side of the first top plate 211 and the injection molded bracket 24 near the first bottom plate 212, and is spaced apart from the first side plate 213 to form a first magnetic gap 25. The side magnetic part 23 is disposed on the side of the first bottom plate 212 near the first top plate 211, and is spaced apart from the first side plate 213 to form a second magnetic gap 26.

[0080] In this embodiment, as shown in Figures 2 to 8, the magnetic yoke 21 can be selected as an integrally formed structure, that is, the magnetic yoke 21 is integrally stretched to form a first bottom plate 212, a first side plate 213, and a first top plate 211 connected in sequence. This design can reduce the structural complexity of the magnetic yoke 21 and reduce the molding difficulty of the magnetic yoke 21. The first side plate 213 of the magnetic yoke 21 can optionally be arranged around the periphery of the first top plate 211 and at an angle to the first top plate 211. The first side plate 213 and the first top plate 211 enclose a receiving cavity, and the first bottom plate 212 is located on the side of the first side plate 213 facing away from the receiving cavity. It can be understood that the central magnetic part 22 is located inside the receiving cavity of the magnetic yoke 21, and the side magnetic part 23 is located outside the receiving cavity of the magnetic yoke 21, that is, the side magnetic part 23 and the central magnetic part 22 are located on opposite sides of the first side plate 213.

[0081] Optionally, the first top plate 211 and the first bottom plate 212 are connected to both ends of the first side plate 213 along the vibration direction of the vibration system 3. It can be understood that the first top plate 211 and the first bottom plate 212 of the magnetic yoke 21 are distributed vertically along the vibration direction of the vibration system 3, that is, the first top plate 211 and the first bottom plate 212 have a height difference in the vibration direction of the vibration system 3. This ensures that the size of the magnetic circuit system 2 along the vibration direction of the vibration system 3 is not too large, thereby achieving a thin and light design.

[0082] In this embodiment, the first top plate 211 of the magnetic yoke 21 is annular, and a through hole structure is formed in the center of the first top plate 211. The inner periphery of the first top plate 211 is integrally formed with the injection molded bracket 24, so that the first top plate 211 of the magnetic yoke 21 and the injection molded bracket 24 cooperate to install and fix the central magnetic part 22, and the inner periphery of the second diaphragm 32 is fixed by the side of the injection molded bracket 24 facing away from the central magnetic part 22.

[0083] Optionally, the side of the injection-molded bracket 24 facing the central magnet 22 is flush with the side of the first top plate 211 facing the central magnet 22. This allows the injection-molded bracket 24 and the first top plate 211 to effectively increase the bonding area with the central magnet 221 of the central magnet 22, thereby improving connection stability and reducing reliability risks.

[0084] Optionally, the injection-molded bracket 24 protrudes from the side of the first top plate 211 opposite to the central magnet 22 and connects to the inner periphery of the second diaphragm 32. This allows the injection-molded bracket 24 to fix the second diaphragm 32 and improves the sealing of the first cavity 13. Furthermore, since the injection-molded bracket 24 is an injection-molded part, the width of the portion of the injection-molded bracket 24 used to support the inner periphery of the second diaphragm 32 can be selected according to actual usage requirements, thereby increasing the bonding area of ​​the second diaphragm 32 and improving its bonding strength.

[0085] In order to further improve the structural strength and connection stability of the magnetic yoke 21 and the injection molded bracket 24, in one embodiment, as shown in Figures 2 and 6, the injection molded bracket 24 is provided with a first embedding groove 242, and the inner periphery of the first top plate 211 is provided with a first embedding part 2111. The first embedding part 2111 is embedded in the first embedding groove 242, which is not limited here.

[0086] In this embodiment, the central magnetic part 22 is disposed within the receiving cavity and connected to the first top plate 211 and the injection molding bracket 24, and is spaced apart from the first side plate 213 to form a first magnetic gap 25. The first bottom plate 212 is optionally connected to the end of the first side plate 213 away from the first top plate 211, and the first bottom plate 212 extends in a direction away from the receiving cavity and is angled with the first side plate 213. The side magnetic part 23 is disposed on the first bottom plate 212 and is spaced apart from the first side plate 213 to form a second magnetic gap 26; that is, the side magnetic part 23 and the central magnetic part 22 are located on opposite sides of the first side plate 213.

[0087] Understandably, the second through hole 223, the first through hole 241, and the third through hole 324 are coaxially arranged along the vibration direction of the vibration system 3, so that the second through hole 223, the first through hole 241, and the third through hole 324 are connected in sequence to form a through hole 4. If the opening area of ​​the through hole 4 is too small, it will not be conducive to the radiation of sound waves from the first diaphragm 31 to the outside. If the opening area of ​​the through hole 4 is too large, the bonding area between the central magnetic part 22 and the first top plate 211 and the injection molded bracket 24 will be too small, which will not be conducive to improving the connection reliability between the two.

[0088] It should be noted that there can be one or more through holes 4. When there is only one through hole 4, the opening area of ​​the through hole 4 is the opening area of ​​that one through hole 4. When there are multiple through holes 4, the opening area of ​​the through hole 4 is the sum of the opening areas of the multiple through holes 4, which is not limited here.

[0089] In this embodiment, the projected area of ​​the first top plate 211 is defined as S1, and the opening area of ​​the through hole 4 is defined as S2, where S2 = (10%~80%)S1. In this embodiment, by controlling the opening area of ​​the through hole 4, it is beneficial for the sound waves of the first diaphragm 31 to radiate to the outside, while also ensuring the structural strength of the magnetic yoke 21 and the connection area between the central magnetic part 22 and the first top plate 211 and the injection-molded bracket 24, thereby improving stability.

[0090] Optionally, the opening area S2 of the through hole 4 accounts for 10% to 80% of the projected area S1 of the first top plate 211. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc., and is not limited here.

[0091] In one embodiment, the central magnetic part 22 includes a central magnet 221 and a central magnetic guide plate 222 stacked together. The central magnet 221 is connected to the first top plate 211 and the injection molding bracket 24. The second through hole 223 passes through the central magnetic guide plate 222 and the central magnet 221 in sequence.

[0092] In this embodiment, as shown in FIG2, the central magnet 221 is connected to the first top plate 211 of the magnetic yoke 21 and the injection-molded bracket 24. That is, the central magnet 221 is sandwiched between the first top plate 211 and the central magnetic plate 222. The outer periphery of the central magnet 221 and the central magnetic plate 222 are spaced apart from the first side plate 213 of the magnetic yoke 21 to form a first magnetic gap 25.

[0093] Understandably, the central magnetic plate 222 of the central magnetic part 22 is provided with a first through hole, and the central magnet 221 is provided with a second through hole, so that the first through hole and the second through hole are connected in sequence to form a second through hole 223. Optionally, the first through hole and the second through hole are coaxially arranged along the vibration direction of the vibration system 3.

[0094] Optionally, the central magnet 221 and the central magnetic plate 222 of the central magnetic part 22 can be circular plate-shaped or disk-shaped structures, which are not limited here.

[0095] In one embodiment, the first base plate 212 is provided with a clearance groove 2121 corresponding to the second magnetic gap 26. The clearance groove 2121 extends recessedly in a direction away from the second voice coil 34. In this way, the clearance groove 2121 can provide clearance space for the second voice coil 34, which can increase the vibration space of the second voice coil 34, thereby improving the acoustic performance of the sound generating device 100.

[0096] In this embodiment, as shown in Figures 2 to 4, the side magnetic part 23 includes a side magnet 231 and a side magnetic guide plate 232 stacked together, with the side magnet 231 connected to the magnetic yoke 21. It can be understood that the side magnet 231 is connected to the first base plate 212 of the magnetic yoke 21, that is, the side magnet 231 is sandwiched between the first base plate 212 and the side magnetic guide plate 232. The inner peripheries of both the side magnet 231 and the side magnetic guide plate 232 are spaced apart from the first side plate 213 of the magnetic yoke 21 to form a second magnetic gap 26. Optionally, the side magnet 231 and the side magnetic guide plate 232 of the side magnetic part 23 can be selected as a ring structure, which is not limited here.

[0097] To further improve connection stability, in this embodiment, the side magnetic plate 232 and the outer shell 1 are integrally formed. It is understood that the outer shell 1 can be made of metal or plastic. When the outer shell 1 is made of metal, the outer shell 1 and the side magnetic plate 232 are integrally formed, which simplifies the processing steps and improves heat dissipation. When the outer shell 1 is made of plastic, the outer shell 1 and the side magnetic plate 232 can be integrally injection molded; this is not limited here.

[0098] Optionally, the side magnetic plate 232 and the second housing 12 of the outer shell 1 are integrally formed, which is not limited here. In this embodiment, the side magnetic plate 232 is injection molded onto the outer shell 1, and the first leakage hole 121 is formed by removing material from the side magnetic plate 232 and / or the corresponding area of ​​the outer shell 1. It can be understood that by forming the first leakage hole 121 on the side magnetic plate 232 or on the outer shell 1, or simultaneously on the side magnetic plate 232 and the outer shell 1, the first leakage hole 121 does not occupy additional radial dimensions of the sound-generating device 100, or the size of the first leakage hole 121 can be increased within the limited size of the sound-generating device 100 to balance the internal pressure.

[0099] In one embodiment, the first housing 11 may be a plastic housing. In this embodiment, as shown in Figures 2, 3, 5, and 6, the outer periphery of the magnetic yoke 21 is integrally injection molded with the first housing 11. It can be understood that the outer periphery of the first base plate 212 of the magnetic yoke 21 is integrally injection molded with the first housing 11, which can improve the connection stability between the magnetic yoke 21 and the outer shell 1.

[0100] Optionally, the first housing 11 is provided with a second embedding groove 111, and the outer periphery of the magnetic yoke 21 is provided with a second embedding part 2122, which is embedded in the second embedding groove 111.

[0101] Of course, in other embodiments, the magnetic yoke 21 and the first housing 11 can also be bonded together. As shown in Figures 4 and 7, a support platform 112 protrudes from the inner wall of the first housing 11, and the outer periphery of the magnetic yoke 21 is supported on the support platform 112 and bonded together with the support platform 112. This is not limited here.

[0102] In one embodiment, the second diaphragm 32 includes an inner folded ring 321, a vibrating part 322 and an outer folded ring 323 connected in sequence. The inner folded ring 321 has a third through hole 324 on its inner side and is connected to the injection molding bracket 24. The outer side of the outer folded ring 323 is connected to the outer shell 1. The second voice coil 34 is connected to the vibrating part 322.

[0103] In this embodiment, as shown in Figures 2 to 4, by setting the second diaphragm 32 as a double-folded ring structure, the second diaphragm 32 is conveniently connected to the outer shell 1 through the outer side of the outer folded ring 323 and to the injection molded bracket 24 through the inner side of the inner folded ring 321, so as to achieve the sealing of the first cavity 13 and ensure that the second voice coil 34 drives the second diaphragm 32 to vibrate when it vibrates.

[0104] Understandably, the inner side of the inner fold ring 321 of the second diaphragm 32 can be a ring structure or a flat plate structure. When the inner side of the inner fold ring 321 is a ring structure, a third through hole 324 is formed on the inner side of the inner fold ring 321; when the inner side of the inner fold ring 321 is a flat plate structure, the flat plate structure is provided with a third through hole 324, which is not limited here.

[0105] In this embodiment, the inner fold 321 and outer fold 323 of the second diaphragm 32 are either upwardly convex or downwardly concave structures, and are not limited thereto. It is understood that the inner fold 321 of the second diaphragm 32 protrudes away from the injection molding bracket 24, thus avoiding interference from the injection molding bracket 24 when the second diaphragm 32 vibrates. Optionally, both the inner fold 321 and outer fold 323 of the second diaphragm 32 protrude away from the magnetic circuit system 2.

[0106] Optionally, the inner folding ring 321, the vibrating part 322, and the outer folding ring 323 of the second diaphragm 32 are integrally formed, which simplifies the processing steps of the second diaphragm 32 and improves the structural strength of the second diaphragm 32.

[0107] In one embodiment, as shown in FIG2, the second diaphragm 32 further includes a vibrating plate 325, which is disposed between the vibrating part 322 and the second voice coil 34. It can be understood that by providing the vibrating plate 325, the structural strength of the second diaphragm 32 is enhanced, the acoustic performance of the second diaphragm 32 is improved, and the tearing of the second diaphragm 32 is prevented when the second voice coil 34 vibrates.

[0108] In one embodiment, the first diaphragm 31 includes a folded ring portion 311 and a dome 312. The folded ring portion 311 is disposed around the dome 312. The outer edge of the folded ring portion 311 is connected to the housing 1. The first voice coil 33 is connected to the dome 312.

[0109] In this embodiment, as shown in Figures 2 to 4, the folded ring portion 311 and the dome 312 of the first diaphragm 31 can be integrally formed or separately configured, without limitation. It is understood that the folded ring portion 311 of the first diaphragm 31 can be an upwardly convex structure or a downwardly concave structure, without limitation. Optionally, the folded ring portion 311 protrudes in a direction away from the magnetic circuit system 2.

[0110] Understandably, the outer edge of the folded ring 311 is connected to the outer shell 1, and the first voice coil 33 is connected to the dome 312. When the first voice coil 33 vibrates, it drives the first diaphragm 31 to vibrate, thereby causing the sound waves of the first diaphragm 31 to radiate outward along the second through hole 223, the first through hole 241 and the third through hole 324.

[0111] In one embodiment, the second through hole 223, the first through hole 241 and the third through hole 324 are connected in sequence to form a through hole 4. The outer contour of the dome 312 is circular and the through hole 4 is a circular hole. The diameter of the dome 312 is defined as D1 and the diameter of the through hole 4 is defined as D2, where D2≥0.3D1.

[0112] Understandably, the diameter of the dome 312 and the diameter of the through hole 4 directly affect the transmission of sound waves from the first diaphragm 31. By using the above diameter design method, the sound waves from the first diaphragm 31 can be transmitted smoothly, reducing airflow noise.

[0113] In order to ensure the smooth transmission of sound waves from the first diaphragm 31, in another embodiment, the projected area of ​​the through hole 4 along the vibration direction of the vibration system 3 is defined as S1, and the projected area of ​​the dome 312 along the vibration direction of the vibration system 3 is defined as S2, where S1 ≥ 8.5% * S2.

[0114] Understandably, the aforementioned projected area design ensures the smooth transmission of sound waves from the first diaphragm 31 and reduces airflow noise. In practical applications, a suitable structural design should be selected based on specific needs to ensure the smooth transmission of sound waves from the first diaphragm 31 and reduce airflow noise; no specific limitations are imposed here.

[0115] In one embodiment, as shown in Figures 2 to 4, the sound-generating device 100 further includes a first support ring 51, which is disposed between the outer periphery of the first diaphragm 31 and the outer shell 1. Optionally, the first support ring 51 can be a steel ring. By using the first support ring 51 between the outer periphery of the folded ring portion 311 of the first diaphragm 31 and the outer shell 1, the first diaphragm 31 is easier to handle during assembly, and the assembly accuracy is improved, thereby enhancing the performance of the sound-generating device 100.

[0116] In one embodiment, as shown in Figures 2 to 4, the sound-generating device 100 further includes a second support ring 52, which is disposed between the outer periphery of the second diaphragm 32 and the outer shell 1. Optionally, the second support ring 52 can be a steel ring. The use of the second support ring 52 between the outer periphery of the outer folded ring 323 of the second diaphragm 32 and the outer shell 1 makes it easier to handle the second diaphragm 32 during assembly, while also improving assembly accuracy and enhancing the performance of the sound-generating device 100.

[0117] In one embodiment, the sound-generating device 100 further includes a front cover 7, which is located on the side of the first diaphragm 31 away from the second diaphragm 32. A second cavity 71 is formed between the first diaphragm 31 and the front cover 7. The front cover 7 is provided with a fourth through hole 72 that connects the second cavity 71 to the outside.

[0118] In this embodiment, as shown in Figures 1 to 4, by providing a front cover 7, the first diaphragm 31 is protected, and a second cavity 71 is formed between the front cover 7 and the first diaphragm 31 to ensure the amplitude of the first diaphragm 31. It can be understood that by providing a fourth through hole 72 in the front cover 7, sound waves from the second side of the first diaphragm 31 can be radiated outwards through the fourth through hole 72.

[0119] Optionally, the front cover 7 is a metal part machined from metal, which facilitates strong support for the sound-generating device 100 during assembly and also reduces its footprint on the overall size of the device. In specific applications, an appropriate number of fourth through holes 72 are set according to actual conditions, and are not limited to a fixed number. Preferably, the fourth through holes 72 are provided with damping elements or venting membranes, which can further adjust the airflow velocity of the second cavity 71 and adjust the acoustic impedance of the second cavity 71.

[0120] In this embodiment, the sound-generating device 100 of the present invention achieves sound generation by setting a dual-diaphragm and dual-voice coil structure and using a magnetic circuit system 2 to drive the two diaphragms of the two voice coils to vibrate. At the same time, it achieves sound generation of the dual-sided diaphragm without increasing the external size, thereby increasing the vibration area of ​​the vibration system 3 and thus improving performance. Furthermore, the dual-sided diaphragm radiates sound waves on the same side of the sound-generating device 100, which is beneficial to improving the loudness and sensitivity of the sound-generating device 100. Furthermore, the magnetic yoke 21 is configured with a positive and negative tension structure, and an integrally injection-molded bracket 24 is provided on the inner edge of the magnetic yoke 21. The injection-molded bracket 24 is used to fix the inner edge of the second diaphragm 32, and the magnetic yoke 21 and the injection-molded bracket 24 are used together to fix the central magnetic part 22 of the magnetic circuit system 2. This increases the bonding area of ​​the central magnet 221, improves stability, and reduces reliability risks. By connecting the second through hole 223 of the central magnetic part 22, the first through hole 241 of the injection-molded bracket 24, and the third through hole 324 of the second diaphragm 32 in sequence to form an airflow channel, the airflow area of ​​the first diaphragm 31 during vibration is effectively increased, thereby ensuring smoother airflow and improving the high-frequency performance of the first diaphragm 31. This, in turn, improves the high-frequency performance of the first diaphragm 31 and the second diaphragm 32 after being superimposed.

[0121] The present invention also proposes an electronic device including the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is as described in the foregoing embodiments. Since this electronic device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0122] In one embodiment, the electronic device further includes a device housing with a receiving cavity. The sound-generating device 100 is disposed in the receiving cavity and the receiving cavity is divided into a front cavity and a rear cavity that are isolated from each other. The first side of the first diaphragm 31 and the second diaphragm 32 is connected to the front cavity. The device housing is provided with a sound outlet hole that is connected to the front cavity. The sound waves from the first side of the first diaphragm 31 and the second diaphragm 32 of the sound-generating device 100 are radiated to the outside through the front cavity and the sound outlet hole.

[0123] In this embodiment, the device housing can be a metal housing or a plastic housing, and there is no limitation thereto. The device housing can be a one-piece molded structure or a split structure, and there is no limitation thereto. Optionally, the device housing includes an upper shell and a lower shell, which can be bonded together or welded together to enclose and form a receiving cavity.

[0124] Optionally, the outer contour of the device housing can be a square structure. In specific applications, other suitable shapes such as circles can be selected according to the actual situation, and it is not limited to a specific shape.

[0125] Understandably, a sound outlet hole connected to the front cavity is provided on the upper shell of the device housing, so that the sound waves from the first side of the first diaphragm 31 and the second diaphragm 32 of the sound-generating device 100 are radiated to the outside through the front cavity and the sound outlet hole.

[0126] In this embodiment, the first cavity 13 of the sound-generating device 100 is connected to the rear cavity through the first leakage hole 121, and the second side of the first diaphragm 31 is connected to the rear cavity. In one embodiment, the device housing is further provided with a second leakage hole, which is connected to the rear cavity.

[0127] In one embodiment, the device housing further includes a second leakage hole communicating with the rear cavity, and the second side of the first diaphragm 31 communicating with the rear cavity. It is understood that the lower shell of the device housing has a second leakage hole communicating with the rear cavity. The first diaphragm 31 and the second diaphragm 32 radiate sound waves with phase opposite to the sound waves in the front cavity into the rear cavity, and the sound waves in the rear cavity radiate to the outside through the second leakage hole. Optionally, a damping element for adjusting acoustic impedance is provided on the second leakage hole.

[0128] In this embodiment, a second leakage hole is provided on the lower shell of the device housing. The second leakage hole communicates with the rear cavity and is used to adjust the pressure in the rear cavity, further adjusting the air pressure in the first cavity 13. At the same time, the sound waves from the rear cavity radiate to the outside through the second leakage hole. The sound waves from the rear cavity are out of phase with the sound waves from the front cavity, which can act as an acoustic dipole, achieving the technical effects of far-field noise reduction and protecting user privacy.

[0129] In this embodiment, the second leakage hole can be a circular hole, an elliptical hole, or a polygonal hole, etc., and is not limited thereto. The number of the second leakage holes can be one or more, depending on the actual application design, and is not limited thereto.

[0130] In this embodiment, the upper shell includes a top wall and a first side wall, and the lower shell includes a bottom wall and a second side wall. The first and second side walls together form the side walls of the electronic device housing, that is, the device housing includes a top wall and a bottom wall disposed opposite each other, and a side wall connecting the top wall and the bottom wall. Optionally, the sound outlet is located in the connection area between the top wall and the side wall, and the second leakage hole is located in the connection area between the side wall and the bottom wall. In this way, the sound performance of the electronic device and the technical effect of protecting privacy can be taken into account. The most suitable design scheme can be selected according to actual needs during use, and the present invention does not impose any limitations.

[0131] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: shell; A magnetic circuit system, comprising a central magnetic part, a side magnetic part, a magnetically conductive yoke, and an injection-molded bracket. The inner edge of the magnetically conductive yoke is integrally injection-molded with the injection-molded bracket. The injection-molded bracket has a first through hole. The central magnetic part is connected to the magnetically conductive yoke and the injection-molded bracket, forming a first magnetic gap with the magnetically conductive yoke. The central magnetic part has a second through hole corresponding to and communicating with the first through hole. The side magnetic part is connected to the magnetically conductive yoke, forming a second magnetic gap with the magnetically conductive yoke. The second magnetic gap surrounds the first magnetic gap. A vibration system includes a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil. The first diaphragm and the second diaphragm are located on opposite sides of the magnetic circuit system. The outer periphery of the first diaphragm is connected to the outer shell and is opposite to and spaced from the magnetic circuit system. The outer periphery of the second diaphragm is connected to the outer shell, and the inner periphery of the second diaphragm is connected to the injection-molded bracket. The inner periphery of the second diaphragm is provided with a third through hole communicating with the first through hole. One end of the first voice coil is connected to the first diaphragm, and the other end of the first voice coil is suspended in the first magnetic gap. One end of the second voice coil is connected to the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap.

2. The sound-generating device as described in claim 1, characterized in that, The magnetic yoke includes a first top plate, a first bottom plate, and a first side plate connecting the first top plate and the first bottom plate. The end of the first bottom plate away from the first side plate is connected to the outer shell. The inner periphery of the first top plate is integrally injection molded with the injection molded bracket. The central magnetic part is located on the side of the first top plate and the injection molding bracket near the first bottom plate, and is spaced apart from the first side plate to form the first magnetic gap. The side magnetic part is located on the side of the first bottom plate near the first top plate, and is spaced apart from the first side plate to form the second magnetic gap.

3. The sound-generating device as described in claim 2, characterized in that, The injection molding bracket is provided with a first embedding groove, and the inner periphery of the first top plate is provided with a first embedding part, which is embedded in the first embedding groove. And / or, the side of the injection-molded bracket facing the central magnet is flush with the side of the first top plate facing the central magnet; And / or, the injection-molded bracket protrudes from the side of the first top plate opposite to the central magnet on the side opposite to the central magnet, and is connected to the inner periphery of the second diaphragm; And / or, the first base plate is provided with an avoidance groove corresponding to the second magnetic gap, and the avoidance groove extends inward in a direction away from the second voice coil; And / or, the first top plate and the first bottom plate are connected to both ends of the first side plate along the vibration direction of the vibration system; And / or, the magnetic yoke is integrally stretched to form the first bottom plate, the first side plate, and the first top plate connected in sequence; And / or, the central magnetic part includes a central magnet and a central magnetic guide plate stacked together, the central magnet being connected to the first top plate and the injection molding bracket, and the second through hole sequentially penetrating the central magnetic guide plate and the central magnet.

4. The sound-generating device as described in claim 1, characterized in that, The outer casing includes a first casing and a second casing connected to each other. The end of the first casing away from the second casing is connected to the outer side of the first diaphragm. The side of the second casing opposite to the first casing is connected to the outer periphery of the second diaphragm. The outer periphery of the magnetic yoke is connected to the first casing.

5. The sound-generating device as described in claim 4, characterized in that, The first housing is a plastic housing; The outer periphery of the magnetic yoke is integrally injection molded with the first housing; wherein, the first housing is provided with a second embedding groove, the outer periphery of the magnetic yoke is provided with a second embedding part, and the second embedding part is embedded in the second embedding groove; or, the inner wall of the first housing is provided with a support platform, the outer periphery of the magnetic yoke is supported on the support platform, and is bonded to the support platform. And / or, the edge magnetic part includes an edge magnet and an edge magnetic plate stacked together, the edge magnet is connected to the magnetic yoke, and the edge magnetic plate and the second housing are integrally formed.

6. The sound-generating device as claimed in claim 1, characterized in that, The first diaphragm includes a folded ring and a dome. The folded ring surrounds the dome, and the outer edge of the folded ring is connected to the housing. The first voice coil is connected to the dome. The second through hole, the first through hole, and the third through hole are sequentially connected to form a through hole. Wherein, the outer contour of the dome is circular, the through hole is a circular hole, the diameter of the dome is defined as D1, the diameter of the through hole is defined as D2, and D2≥0.3D1; or, the projected area of ​​the through hole along the vibration direction of the vibration system is defined as S1, and the projected area of ​​the dome along the vibration direction of the vibration system is defined as S2, and S1≥8.5%*S2.

7. The sound-generating device as claimed in claim 1, characterized in that, The second diaphragm includes an inner folded ring, a vibrating part, and an outer folded ring connected in sequence. The inner folded ring has the third through hole on its inner side and is connected to the injection molding bracket. The outer side of the outer folded ring is connected to the outer shell. The second voice coil is connected to the vibrating part. The second diaphragm further includes a vibrating plate, which is disposed between the vibrating part and the second voice coil.

8. The sound-generating device as claimed in claim 1, characterized in that, The first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves of the same phase outward; And / or, the second diaphragm is an annular diaphragm, the inner edge of the second diaphragm forms the third through hole, and the sound-generating device further includes a first venting member, the first venting member being connected to the inner edge of the first diaphragm and covering the third through hole; And / or, a first cavity is formed between the second diaphragm, the outer shell, the magnetic yoke and the injection-molded bracket, the sound-generating device is provided with a first leakage hole connecting the first cavity and the outside, and the sound-generating device further includes a second ventilator covering the first leakage hole.

9. The sound-generating device as described in any one of claims 1 to 8, characterized in that, The sound-generating device further includes a first support ring, which is disposed between the outer periphery of the first diaphragm and the outer shell; And / or, the sound-generating device further includes a second support ring, which is disposed between the outer periphery of the second diaphragm and the outer shell; And / or, the sound-generating device further includes a front cover, the front cover being located on the side of the first diaphragm away from the second diaphragm, a second cavity being formed between the first diaphragm and the front cover, and the front cover having a fourth through hole communicating with the second cavity and the outside.

10. An electronic device, characterized in that, The electronic device includes: Equipment housing, the equipment housing having a receiving cavity; and The sound-generating device as described in any one of claims 1 to 9 is disposed within the receiving cavity and divides the receiving cavity into a mutually isolated front cavity and a rear cavity; The device housing is provided with a sound outlet hole that connects to the front cavity, and the sound waves of the first and second diaphragms of the sound-generating device are radiated to the outside through the sound outlet hole.

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