Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a magnetic conductive yoke of a magnetic circuit system of the sound production device is provided with a first through hole, and a central magnetic part is connected with the magnetic conductive yoke through a connecting bracket and is positioned on the circumferential inner side of the magnetic conductive yoke, so that the inner circumferential wall of the magnetic conductive yoke is separated from the central magnetic part to form a first magnetic gap; the connecting support, the magnetic conductive yoke and the central magnetic part are matched to form an airflow channel communicated with the first magnetic gap and the first through hole, a second magnetic gap is formed between the edge magnetic part and the magnetic conductive yoke, a first vibrating diaphragm and a second vibrating diaphragm of the vibrating system are located on the two opposite sides of the magnetic circuit system, and the inner periphery of the second vibrating diaphragm is connected with the side, opposite to the connecting support, of the magnetic conductive yoke. And a second through hole communicated with the first through hole is formed in the inner periphery of the second vibrating diaphragm. According to the sound production device, the falling reliability risk is reduced, the structural firmness of a product is improved, and the high-frequency performance is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducers, and particularly to a sound generating device and an electronic device using the sound generating device. Background Art

[0002] In recent years, with the rapid development of consumer electronic products, electronic devices such as headphones, smart phones, VR devices, etc. have been recognized by consumers and widely used. Those skilled in the art have also correspondingly improved related supporting products such as headphones to meet the performance requirements of electronic products and the needs of consumers for product performance.

[0003] The sound generating device is an important electroacoustic transducer component in consumer electronic products and is widely used as a speaker, earphone, receiver, etc. With the improvement of the performance of electronic products, the improvement of the acoustic performance of the sound generating device is also an inevitable trend. In the related art, a sound generating device is proposed. A first diaphragm and a second diaphragm are respectively provided on opposite sides of the magnetic circuit system of the sound generating device. The magnetic circuit system includes a magnetically conductive yoke formed by integral stretching. The central magnet and the edge magnet of the magnetic circuit system are respectively provided on different support walls of the magnetically conductive yoke. The inner peripheral edge of one of the diaphragms is also fixed on the top wall of the magnetically conductive yoke. Although the above structure can achieve the effect of improving the acoustic performance of the sound generating device, however, the above structural design is relatively extreme, the bonding area between the magnet of the magnetic circuit system and the magnetically conductive yoke and between the diaphragm and the magnetically conductive yoke is small, the risk of product reliability drop is large, and the service life of the product is greatly affected. Summary of the Invention

[0004] The main object of the present invention is to provide a sound generating device and an electronic device, aiming to provide a sound generating device that effectively improves the high-frequency performance. The sound generating device not only reduces the risk of drop reliability, improves the structural firmness performance of the product, but also effectively improves the high-frequency performance, thereby improving the sound generating performance of the whole machine.

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

[0006] A housing;

[0007] A magnetic circuit system, the magnetic circuit system comprising a central magnetic part, side magnetic parts, a magnetic yoke and a connecting bracket. The magnetic yoke is provided with a first through hole. The central magnetic part is connected to the magnetic yoke through the connecting bracket and is located on the inner circumferential side of the magnetic yoke, so that the inner circumferential wall of the magnetic yoke is spaced apart from the central magnetic part. A first magnetic gap is formed between the central magnetic part and the magnetic yoke. The connecting bracket, the magnetic yoke and the central magnetic part cooperate to form an air flow channel communicating the first magnetic gap and the first through hole. The side magnetic parts are connected to the magnetic yoke and form a second magnetic gap with the magnetic yoke. The second magnetic gap is arranged around the first magnetic gap; and

[0008] A vibration system, the vibration system comprising 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 peripheral edge of the first diaphragm is connected to the housing and is opposite to and spaced apart from the magnetic circuit system. The outer peripheral edge of the second diaphragm is connected to the housing. The inner peripheral edge of the second diaphragm is connected to the side of the magnetic yoke facing away from the connecting bracket, and a second through hole communicating the first through hole is provided on the inner peripheral edge of the second diaphragm. 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 an embodiment, the magnetic yoke comprises a first top plate, a first bottom plate and a first side plate connecting the first top plate and the first bottom plate. The first top plate and the first side plate enclose a receiving groove. The first bottom plate is located on the side of the first side plate facing away from the receiving groove and extends in a direction away from the receiving groove. The first top plate is provided with the first through hole;

[0010] Both the connecting bracket and the central magnetic part are located in the receiving groove. The connecting bracket is connected to the first top plate. The central magnetic part is arranged on the side of the connecting bracket facing away from the first top plate. The connecting bracket and the central magnetic part are respectively spaced apart from the first side plate to form the air flow channel. A circumferential side of the central magnetic part is spaced apart from the first side plate to form the first magnetic gap. The side magnetic parts are arranged on the first bottom plate and are spaced apart from the first side plate to enclose and form the second magnetic gap.

[0011] In an embodiment, the connecting bracket comprises a supporting part and a connecting part protruding from the supporting part. One end of the connecting part away from the supporting part is connected to the first top plate. The central magnetic part is arranged on the side of the supporting part facing away from the connecting part.

[0012] In one embodiment, there are multiple connecting parts. The multiple connecting parts are arranged at intervals along the periphery of the supporting part, and the multiple connecting parts are spaced apart and surround the first through hole;

[0013] And / or, the connecting part and the supporting part are of an integrally formed structure;

[0014] And / or, the connecting part is connected to the first top plate by welding or bonding;

[0015] And / or, one end of the connecting part away from the supporting part is bent and extended towards the direction close to the first top plate to form an extension part, and the extension part is connected to the first top plate;

[0016] And / or, the connecting bracket is a metal magnetic conductive plate.

[0017] In one embodiment, an inclined part is formed at the connection between the first top plate and the first side plate. Along the vibration direction of the vibration system, the inclined part extends obliquely from the first side plate towards the direction close to the first through hole, and the inner peripheral wall of the inclined part is respectively spaced apart from the central magnetic part and the connecting bracket;

[0018] And / or, the first bottom plate is provided with an avoidance groove corresponding to the second magnetic gap, and the avoidance groove extends in a concave manner towards the direction away from the second voice coil;

[0019] 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;

[0020] And / or, the central magnetic part includes a central magnet and a central magnetic conductive plate which are stacked, and the central magnet is connected to the connecting bracket;

[0021] And / or, the magnetic yoke is integrally stretched to form the first bottom plate, the first side plate and the first top plate which are connected in sequence.

[0022] In one embodiment, the housing includes a first housing and a second housing which are connected. One end of the first housing away from the second housing is connected to the outer periphery of the first diaphragm, one side of the second housing facing away from the first housing is connected to the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected to the first housing.

[0023] In one embodiment, the first housing is a plastic housing, and the outer periphery of the magnetic yoke is integrally injection-molded with the first housing;

[0024] And / or, a support platform is convexly provided on the inner wall of the first housing, and the outer periphery of the magnetic yoke is supported on and connected to the support platform;

[0025] And / or, the side magnetic part includes a side magnet and a side magnetic guide plate arranged in a stacked manner. The side magnet is connected to the magnetic yoke, and the side magnetic guide plate and the second housing are of an integrally formed structure.

[0026] In one embodiment, the first diaphragm includes a surround portion and a dome. The surround portion surrounds the dome, the outer edge of the surround portion is connected to the housing, and the first voice coil is connected to the dome.

[0027] Wherein, the outer contour of the dome is circular, the first through hole is a circular hole. Define the diameter of the dome as D1, and define the diameter of the first through hole as D2, D2≥0.3D1; or, define the projected area of the first through hole along the vibration direction of the vibration system as S1, and define the projected area of the dome along the vibration direction of the vibration system as S2, S1≥8.5%*S2.

[0028] In one embodiment, the second diaphragm includes an inner surround, a vibrating portion and an outer surround connected in sequence. The second through hole is provided on the inner side of the inner surround and is connected to the magnetic yoke. The outer side of the outer surround is connected to the housing, and the second voice coil is connected to the vibrating portion.

[0029] Wherein, the second diaphragm further includes a vibrating plate, and the vibrating plate is arranged between the vibrating portion and the second voice coil.

[0030] In one embodiment, the first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves with the same phase outward.

[0031] And / or, the second diaphragm is an annular diaphragm, the inner edge of the second diaphragm forms the second through hole, and the sound generating device further includes a first air-permeable member, and the first air-permeable member is connected to the inner edge of the first diaphragm and covers the second through hole.

[0032] And / or, a first cavity is formed between the second diaphragm, the housing and the magnetic yoke. The sound generating device is provided with a first leakage hole communicating the first cavity with the outside, and the sound generating device further includes a second air-permeable member covering the first leakage hole.

[0033] In one embodiment, the sound generating device further includes a first support ring, and the first support ring is arranged between the outer peripheral edge of the first diaphragm and the housing.

[0034] And / or, the sound generating device further includes a second support ring, and the second support ring is arranged between the outer peripheral edge of the second diaphragm and the housing.

[0035] And / or, the sound generating device further includes a front cover located on a side of the first diaphragm away from the second diaphragm. A second cavity is formed between the first diaphragm and the front cover, and the front cover is provided with a third through hole communicating the second cavity with the outside.

[0036] The present invention further provides an electronic device, which includes:

[0037] A device housing having a receiving cavity; and

[0038] The above-mentioned sound generating device disposed in the receiving cavity and dividing the receiving cavity into a front cavity and a rear cavity that are isolated from each other;

[0039] Wherein, the device housing is provided with a sound outlet hole communicating with the front cavity, and sound waves of the first diaphragm and the second diaphragm of the sound generating device are radiated to the outside through the sound outlet hole.

[0040] The sound - generating device of the technical solution of the present invention houses a magnetic circuit system and a vibration system in a housing, and a first magnetic gap and a second magnetic gap are provided on the magnetic circuit system, such that the second magnetic gap surrounds the first magnetic gap. The vibration system is set as a first diaphragm, a second diaphragm, a first voice coil and a second voice coil. The first diaphragm and the second diaphragm are respectively arranged 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 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. Thus, when currents are passed through the first voice coil and the second voice coil, the first voice coil and the second voice coil respectively convert electrical energy into mechanical energy in the first magnetic gap and the second magnetic gap formed by the magnetic circuit system, so as to drive the first voice coil and the second voice coil to drive the first diaphragm and the second diaphragm to vibrate respectively. Not only does it achieve sound generation by driving two diaphragms driven by two voice coils with one magnetic circuit system, but also it realizes the same - direction vibration of the double - sided diaphragms without increasing the external dimensions, and increases the vibration area of the vibration system, thereby achieving the purpose of performance improvement. Further, by setting the magnetic circuit system as a central magnetic part, an edge magnetic part, a magnetic yoke and a connecting bracket, the central magnetic part is connected to the magnetic yoke through the connecting bracket and is located inside the circumferential direction of the magnetic yoke, so that a first magnetic gap is formed by the inner circumferential wall of the magnetic yoke being spaced from the central magnetic part. In this way, the connecting bracket is used to fix the central magnetic part, thereby increasing the bonding area of the central magnet, improving the installation stability and reducing the reliability risk. The edge magnetic part is connected to the magnetic yoke and forms a second magnetic gap with the magnetic yoke. The inner peripheral edge of the second diaphragm is connected to the side of the magnetic yoke facing away from the connecting bracket. In this way, the magnetic yoke is used to fix the second diaphragm to increase the connection area with the second diaphragm. And by providing a first through - hole in the magnetic yoke, and an air - flow channel communicating the first magnetic gap and the first through - hole is formed by the cooperation of the connecting bracket, the magnetic yoke and the central magnetic part, and a second through - hole communicating the first through - hole is provided at the inner peripheral edge of the second diaphragm. Thus, the first diaphragm radiates sound waves outward in sequence through the first magnetic gap, the air - flow channel, the first through - hole and the second through - hole, so as to realize the radiation of the sound waves of the first diaphragm and the second diaphragm to the outside on the same side of the sound - generating device, which is beneficial to the superposition of the compressed air when the first diaphragm and the second diaphragm vibrate, improving the loudness and sensitivity of the sound - generating device. And the first magnetic gap, the air - flow channel, the first through - hole and the second through - hole are sequentially connected to form a channel for radiating sound waves outward, effectively increasing the air - flow circulation area when the first diaphragm vibrates, thereby ensuring smoother air - flow circulation and improving the high - frequency performance of the first diaphragm, and thus improving the high - frequency performance after the superposition of the first diaphragm and the second diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0042] Figure 1 Schematic structural diagram of an embodiment of the sound generating device provided by the present invention;

[0043] Figure 2 Exploded schematic diagram of an embodiment of the sound generating device provided by the present invention;

[0044] Figure 3 Schematic cross-sectional view of an embodiment of the sound generating device provided by the present invention;

[0045] Figure 4 Schematic cross-sectional view of another perspective of an embodiment of the sound generating device provided by the present invention;

[0046] Figure 5 Schematic cross-sectional view of the connection between the magnetic yoke and the connection bracket in an embodiment provided by the present invention;

[0047] Figure 6 Schematic cross-sectional view of another perspective of the connection between the magnetic yoke and the connection bracket in an embodiment provided by the present invention;

[0048] Figure 7 Schematic cross-sectional view of the connection between the magnetic yoke and the connection bracket in another embodiment provided by the present invention.

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

[0050] 100, Sound generating device; 1, Housing; 11, First housing; 111, 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 through hole; 212, First bottom plate; 2121, Avoidance groove; 213, First side plate; 214, Tapered portion; 215, Accommodation groove; 22, Central magnetic portion; 221, Central magnet; 222, Central magnetic guide plate; 23, Edge magnetic portion; 231, Edge magnet; 232, Edge magnetic guide plate; 24, Connection bracket; 241, Air flow channel; 242, Support portion; 243, Connection portion; 244, Extension portion; 25, First magnetic gap; 26, Second magnetic gap; 3, Vibration system; 31, First diaphragm; 311, Folded ring portion; 312, Dome; 32, Second diaphragm; 321, Inner folded ring; 322, Vibration portion; 323, Outer folded ring; 324, Second through hole; 325, Vibration plate; 33, First voice coil; 34, Second voice coil; 51, First support ring; 52, Second support ring; 61, First air permeable member; 62, Second air permeable member; 7, Front cover; 71, Second cavity; 72, Third through hole.

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

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

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

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

[0055] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0056] The present invention provides a sound generating device 100. It can be understood that the sound generating device 100 is applied to an electronic device, which can be a mobile phone, headphones, a smart wearable device, etc., and is not limited herein.

[0057] Please refer to Figures 1 to 7 As shown, in an embodiment of the present invention, the sound generating device 100 includes a housing 1, a magnetic circuit system 2, and a vibration system 3. Among them, the magnetic circuit system 2 includes a central magnetic part 22, an edge magnetic part 23, a magnetic yoke 21, and a connecting bracket 24. The magnetic yoke 21 is provided with a first through hole 2111. The central magnetic part 22 is connected to the magnetic yoke 21 through the connecting bracket 24 and is located inside the circumferential direction of the magnetic yoke 21, so that the inner circumferential wall of the magnetic yoke 21 is spaced from the central magnetic part 22. A first magnetic gap 25 is formed between the central magnetic part 22 and the magnetic yoke 21. The connecting bracket 24, the magnetic yoke 21, and the central magnetic part 22 cooperate to form an air flow channel 241 communicating the first magnetic gap 25 and the first through hole 2111. The edge magnetic part 23 is connected to the magnetic yoke 21 and forms a second magnetic gap 26 with 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 peripheral edge of the first diaphragm 31 is connected to the housing 1 and is opposite to and spaced from the magnetic circuit system 2. The outer peripheral edge of the second diaphragm 32 is connected to the housing 1. The inner peripheral edge of the second diaphragm 32 is connected to the side of the magnetic yoke 21 facing away from the connecting bracket 24, and a second through hole 324 communicating the first through hole 2111 is provided at the inner peripheral edge of the second diaphragm 32. 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.

[0058] In this embodiment, the sound generating device 100 can be a sound generating unit of a speaker, and the speaker can be a micro speaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100 are arranged opposite to each other.

[0059] It can be understood that the housing 1 is used to install, fix and support components such as the magnetic circuit system 2 and the vibration system 3. That is, the housing 1 provides an installation foundation for components such as the magnetic circuit system 2 and the vibration system 3. Optionally, the housing 1 can be an integral structure or formed by a combination of multiple split structures, which is not limited herein.

[0060] In this embodiment, the housing 1 can be optionally a box or a frame structure. That is, the housing 1 has a cavity with openings at both ends. The magnetic circuit system 2 is received in the cavity of the housing 1 and connected to the housing 1. The first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are respectively arranged on opposite sides of the magnetic circuit system 2, and the outer peripheries of the first diaphragm 31 and the second diaphragm 32 are respectively connected to both ends of the housing 1. Thus, a double diaphragm structure is formed, so that two diaphragms of two voice coil bands of the vibration system 3 are driven to vibrate by one magnetic circuit system 2 to realize sound emission. At the same time, the double-sided diaphragms emit sound in the same direction without increasing the external dimensions, and the vibration area of the vibration system 3 is increased, so as to achieve the purpose of performance improvement.

[0061] In this embodiment, the housing 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. In this way, it is convenient for the sound-emitting device 100 to connect and conduct the first voice coil 33 and the second voice coil 34 to an external circuit through the conductive terminals.

[0062] It should be noted that the sound-emitting device 100 has a first side and a second side facing away from each other. The first side refers to the side where the second diaphragm 32 is away from the first diaphragm 31, and the second side refers to the side where the first diaphragm 31 is away from the second diaphragm 32. The first side and the second side can be understood in terms of orientation or direction.

[0063] In this embodiment, the sound waves of the first diaphragm 31 are radiated outward through the first magnetic gap 25, the air flow channel 241, the first through hole 2111 and the second through hole 324, and the sound waves of the first diaphragm 31 and the second diaphragm 32 are radiated outward on the same side of the sound-emitting device 100. That is, the sound waves on the first side of the first diaphragm 31 are radiated outward through the first magnetic gap 25, the air flow channel 241, the first through hole 2111 and the second through hole 324, and the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 are radiated outward on the same side of the sound-emitting device 100. In this way, the sound waves of the first diaphragm 31 and the second diaphragm 32 in the vibration system 3 can be superimposed to produce sound, thereby improving the sound emission effect and performance.

[0064] Optionally, the first diaphragm 31 and the second diaphragm 32 vibrate in the same direction and radiate sound waves with the same phase, so as to increase the volume of the sound-emitting device 100.

[0065] In this embodiment, the housing 1 is used to accommodate and fix structures such as the vibration system 3 and the magnetic circuit system 2. In this way, the sound generating device 100 can be applied as an independent component to an electronic device or a sound generating module, which is not limited herein. It can be understood that the outer contour of the sound generating device 100 can be circular or square, so that the outer contours of the housing 1, the magnetic circuit system 2 and the vibration system 3 are correspondingly set to be circular or square, which is specifically designed according to actual needs and is not limited herein.

[0066] Optionally, the housing 1 has a cylindrical structure, that is, both ends of the housing 1 have openings and are in the shape of a circular cylinder with both ends open. The outer perimeters of the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are substantially aligned and are similar to the outer contour of the housing 1. The first diaphragm 31 and the second diaphragm 32 are respectively connected to the openings at both ends of the housing 1, and the magnetic circuit system 2 and the like are arranged in the cavity of the housing 1 and are located between the first diaphragm 31 and the second diaphragm 32. In this way, it is convenient for the regular design of the shape of the sound generating device 100, and it is further convenient to assemble it into the whole machine, simplifying the reserved structure of the whole machine.

[0067] In this embodiment, as Figures 1 to 4 shown, the housing 1 includes a first housing 11 and a second housing 12 connected to each other. One end of the first housing 11 away from the second housing 12 is connected to the outer periphery of the first diaphragm 31, and one side of the second housing 12 facing away from the first housing 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 housing 11.

[0068] It can be understood that the first housing 11 and the second housing 12 of the housing 1 are optionally cylindrical, so that the first housing 11 and the second housing 12 are adaptively connected to form a cylindrical housing 1. By designing the housing 1 as a split 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, which is convenient for 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 housing 1 are respectively provided with conductive terminals, which further facilitates the electrical connection of the first voice coil 33 and the second voice coil 34 to an external circuit and the like.

[0069] In this embodiment, the magnetic circuit system 2 is set to include a central magnetic part 22, side magnetic parts 23, a magnetic yoke 21, and a connecting bracket 24. The central magnetic part 22 is fixed by the connecting bracket 24, so that the central magnetic part 22 is connected to the magnetic yoke 21 through the connecting bracket 24 and is located on the inner circumferential side of the magnetic yoke 21, so that a first magnetic gap 25 is formed by spacing the inner circumferential wall of the magnetic yoke 21 from the central magnetic part 22, thereby increasing the bonding area of the central magnetic part 22, improving the installation stability, reducing the reliability risk, and fixing and installing the side magnetic parts 23 by using the magnetic yoke 21, so that a second magnetic gap 26 is formed between the side magnetic parts 23 and the magnetic yoke 21, and the side magnetic parts 23 are located on the outer side of the central magnetic part 22, so that the second magnetic gap 26 surrounds the first magnetic gap 25. In this way, it is convenient for the first voice coil 33 and the second voice coil 34 of the vibration system 3 to correspond to the first magnetic gap 25 and the second magnetic gap 26 respectively, and conductive terminals are arranged on the housing 1, so that both the first voice coil 33 and the second voice coil 34 are electrically connected to the conductive terminals. In this way, when current is passed through the first voice coil 33 and the second voice coil 34, the first voice coil 33 and the second voice coil 34 respectively 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, so as 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 respectively. Not only is sound generated by driving two voice coils to drive two diaphragms to vibrate through one magnetic circuit system 2, but also the same-direction sound emission of the double-sided diaphragms is realized without increasing the external dimensions, and the vibration area of the vibration system 3 is increased, thereby achieving the purpose of performance improvement.

[0070] In order to enable the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 to radiate outward on the same side of the sound generating device 100, and the sound waves to be superimposed and enhanced to improve the high-frequency performance. In this embodiment, a first through hole 2111 is provided in the magnetic yoke 21, and an air flow channel 241 communicating the first magnetic gap 25 and the first through hole 2111 is formed by the cooperation of the connecting bracket 24, the magnetic yoke 21 and the central magnetic portion 22. The inner peripheral edge of the second diaphragm 32 is connected to the side of the magnetic yoke 21 facing away from the connecting bracket 24, and a second through hole 324 communicating with the first through hole 2111 is provided at the inner peripheral edge of the second diaphragm 32. In this way, the sound waves on the first side of the first diaphragm 31 radiate outward successively through the first magnetic gap 25, the air flow channel 241, the first through hole 2111 and the second through hole 324. That is, the first magnetic gap 25, the air flow channel 241, the first through hole 2111 and the second through hole 324 are connected in sequence to form a channel for radiating sound waves outward. In this way, the sound waves of the first diaphragm 31 and the second diaphragm 32 radiate outward on the same side of the sound generating device 100, which is beneficial to the superposition of the compressed air when the first diaphragm 31 and the second diaphragm 32 vibrate, and improves the loudness and sensitivity of the sound generating device 100. At the same time, the central magnetic portion 22 and the second diaphragm 32 are respectively installed and fixed by using the connecting bracket 24 and the magnetic yoke 21 to improve the installation stability, thereby reducing the reliability risk. And a channel for radiating sound waves outward is formed by the first magnetic gap 25, the air flow channel 241, the first through hole 2111 and the second through hole 324, effectively increasing the air flow area when the first diaphragm 31 vibrates, so as to ensure smoother air flow, improve the high-frequency performance of the first diaphragm 31, and thus improve the high-frequency performance after the superposition of the first diaphragm 31 and the second diaphragm 32.

[0071] The sound generating device 100 of the present invention houses a magnetic circuit system 2 and a vibration system 3 in a housing 1, and 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 is disposed around the first magnetic gap 25. The vibration system 3 is configured as a first diaphragm 31, a second diaphragm 32, a first voice coil 33 and a second voice coil 34, such that the first diaphragm 31 and the second diaphragm 32 are respectively disposed 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 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. Thus, when an electric current is passed through the first voice coil 33 and the second voice coil 34, the first voice coil 33 and the second voice coil 34 respectively 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, so as 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 respectively. It not only realizes sound generation by driving the two diaphragms of the two voice coils with one magnetic circuit system 2, but also realizes the same-direction vibration of the double-sided diaphragms without increasing the external dimensions, and increases the vibration area of the vibration system 3, thereby achieving the purpose of performance improvement;Further, by setting the magnetic circuit system 2 as the central magnetic part 22, the edge magnetic part 23, the magnetic yoke 21 and the connecting bracket 24, the central magnetic part 22 is connected to the magnetic yoke 21 through the connecting bracket 24 and is located on the inner circumferential side of the magnetic yoke 21, so that the inner circumferential wall of the magnetic yoke 21 is spaced from the central magnetic part 22 to form a first magnetic gap 25. In this way, the connecting bracket 24 is used to fix the central magnetic part 22, thereby increasing the bonding area of the central magnetic part 22, improving the installation stability and reducing the reliability risk. The edge magnetic part 23 is connected to the magnetic yoke 21 and forms a second magnetic gap 26 with the magnetic yoke 21. The inner peripheral edge of the second diaphragm 32 is connected to the side of the magnetic yoke 21 facing away from the connecting bracket 24. In this way, the magnetic yoke 21 is used to fix the second diaphragm 32 to increase the connection area with the second diaphragm 32. And by providing a first through hole 2111 in the magnetic yoke 21, and an air flow channel 241 communicating the first magnetic gap 25 and the first through hole 2111 is formed by the cooperation of the connecting bracket 24, the magnetic yoke 21 and the central magnetic part 22, and a second through hole 324 communicating the first through hole 2111 is provided at the inner peripheral edge of the second diaphragm 32. In this way, the first diaphragm 31 radiates sound waves outward through the first magnetic gap 25, the air flow channel 241, the first through hole 2111 and the second through hole 324 in sequence, so as to realize the sound waves of the first diaphragm 31 and the second diaphragm 32 radiating outward on the same side of the sound generating device 100, which is beneficial to the superposition of the air compressed when the first diaphragm 31 and the second diaphragm 32 vibrate, improving the loudness and sensitivity of the sound generating device 100. And the first magnetic gap 25, the air flow channel 241, the first through hole 2111 and the second through hole 324 are connected in sequence to form a channel for radiating sound waves outward, effectively increasing the air flow area when the first diaphragm 31 vibrates, thereby ensuring smoother air flow and improving the high-frequency performance of the first diaphragm 31, and thus improving the high-frequency performance after the superposition of the first diaphragm 31 and the second diaphragm 32.

[0072] In this embodiment, the magnetic yoke 21 is a metal magnetic conductive plate. Optionally, the connecting bracket 24 is a metal magnetic conductive plate. It can be understood that the connecting bracket 24 and the magnetic yoke 21 can be connected by welding or bonding, which is not limited here.

[0073] When the sound generating device 100 of the present invention is actually applied, there can be various application scenarios. 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, and 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 communicate with the external environment, and the sound waves radiated from the first side and the second side to the external environment are out of phase, and the sound waves on both sides cancel each other out in the far field, which is suitable for environments that require far-field noise cancellation and privacy protection.

[0074] 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 sides of the first diaphragm 31 and the second diaphragm 32 communicate with the front cavity, and the second sides of the first diaphragm 31 and the second diaphragm 32 communicate with the rear cavity. The first diaphragm 31 and the second diaphragm 32 vibrate in the same direction, radiate a first sound wave forward into the front cavity, and radiate a second sound wave backward into the rear cavity. The first sound wave and the second sound wave are out of phase.

[0075] Understandably, an electronic device usually has a sound outlet hole for the front cavity sound wave to radiate out and a rear leakage hole communicating with the rear cavity. When using the electronic device, the front cavity sound wave can be radiated out through the sound outlet hole and received by the user; further, the rear cavity sound wave can optionally be radiated out through the rear leakage hole. In this way, the front and rear cavity sound waves can form a sound dipole, achieving the technical effect of reducing sound leakage. Or, the rear cavity sound wave can not be radiated outwards. The sound generating device 100 of the present invention only plays the role of enhancing the superposition of the sound waves on the first sides of the first diaphragm 31 and the second diaphragm 32, improving the high-frequency performance. It can be selected according to the actual situation.

[0076] In one embodiment, the second diaphragm 32 is an annular diaphragm, and a second through hole 324 is formed at the inner edge of the second diaphragm 32. The sound generating device 100 further includes a first air-permeable member 61, and the first air-permeable member 61 is connected to the inner edge of the first diaphragm 31 and covers the second through hole 324.

[0077] In this embodiment, as Figures 2 to 4 shown, the second diaphragm 32 can be an annular diaphragm. At this time, a second through hole 324 is formed at the inner edge of the second diaphragm 32, that is, a second through hole 324 is formed at the inner edge of the second diaphragm 32. Understandably, by providing the first air-permeable member 61, the first air-permeable member 61 is connected to the inner edge of the second diaphragm 32 and covers the second through hole 324. In this way, the first air-permeable member 61 is used to prevent 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.

[0078] In one embodiment, a first cavity 13 is formed between the second diaphragm 32, the housing 1 and the magnetic yoke 21. The sound generating device 100 is provided with a first leakage hole 121 communicating the first cavity 13 with the outside, and the sound generating device 100 further includes a second air-permeable member 62 covering the first leakage hole 121.

[0079] In this embodiment, as Figures 2 to 4As shown, a first cavity 13 is formed by enclosing between the second diaphragm 32 of the vibration system 3, the housing 1, and the magnetic yoke 21. The first cavity 13 can be selected as a sealed cavity. In order to balance the air pressure in the first cavity 13 and improve the vibration balance of the second diaphragm 32. It can be understood that a first leakage hole 121 communicating the first cavity 13 with the outside is provided on the sound generating device 100. Thus, air leakage is achieved by using the first leakage hole 121 to adjust the air pressure in the first cavity 13, balance the air pressure on both sides of the second diaphragm 32, and improve the vibration stability of the second diaphragm 32.

[0080] Optionally, the first leakage hole 121 includes a plurality of them. In this embodiment, the plurality of first leakage holes 121 are symmetrically arranged along the circumferential direction of the sound generating device 100. Thus, the air pressure in the first cavity 13 is balanced by using the first leakage hole 121, and the vibration balance of the second diaphragm 32 is improved.

[0081] In this embodiment, by providing a second air-permeable member 62 at the first leakage hole 121 and using the second air-permeable member 62 to cover the first leakage hole 121, on the one hand, it can prevent 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; on the other hand, it can further adjust the air flow rate in the first cavity 13, adjust the air pressure in the first cavity 13, balance the air pressure on both sides of the second diaphragm 32, and improve the vibration stability of the second diaphragm 32.

[0082] Optionally, a first leakage hole 121 is provided between the first housing 11 and the second housing 12 of the housing 1, and a second air-permeable member 62 is provided at the first leakage hole 121. Thus, the air flow rate in the cavity of the sound generating device 100 can be further adjusted, and the acoustic resistance can be adjusted, thereby improving the performance of the sound generating device 100.

[0083] In an 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 first top plate 211 and the first side plate 213 enclose a receiving groove 215. The first bottom plate 212 is located on the side of the first side plate 213 facing away from the receiving groove 215 and extends in a direction away from the receiving groove 215. The first top plate 211 is provided with a first through hole 2111; both the connecting bracket 24 and the central magnetic part 22 are located in the receiving groove 215, and the connecting bracket 24 is connected to the first top plate 211. The central magnetic part 22 is provided on the side of the connecting bracket 24 facing away from the first top plate 211. The connecting bracket 24 and the central magnetic part 22 are respectively spaced from the first side plate 213 to form an air flow channel 241. A first magnetic gap 25 is formed by the circumferential side of the central magnetic part 22 and the first side plate 213 being spaced apart. The edge magnetic part 23 is provided on the first bottom plate 212 and is spaced from the first side plate 213 to enclose a second magnetic gap 26.

[0084] In this embodiment, asFigures 2 to 7 As shown, the magnetic yoke 21 can be 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 that are sequentially connected. Such a design can reduce the structural complexity of the magnetic yoke 21 and lower the forming difficulty of the magnetic yoke 21. The first side plate 213 of the magnetic yoke 21 is optionally disposed around the periphery of the first top plate 211 and is disposed at an angle with the first top plate 211, and the first side plate 213 and the first top plate 211 enclose a receiving groove 215. The first bottom plate 212 is located on the side of the first side plate 213 facing away from the receiving groove 215. It can be understood that the central magnetic part 22 and the connecting bracket 24 are located in the receiving groove 215 of the magnetic yoke 21, and the edge magnetic part 23 is located outside the receiving groove 215 of the magnetic yoke 21, that is, the edge magnetic part 23 and the central magnetic part 22 are located on opposite sides of the first side plate 213, and the edge magnetic part 23 and the central magnetic part 22 are both spaced from the first side plate 213 and respectively form a second magnetic gap 26 and a first magnetic gap 25.

[0085] 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 vertically distributed 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. In this way, it is ensured that the size of the magnetic circuit system 2 along the vibration direction of the vibration system 3 will not be too large, thereby realizing a thin and light design.

[0086] In this embodiment, the first top plate 211 of the magnetic yoke 21 is annular, a first through hole 2111 is formed in the center of the first top plate 211, and the inner peripheral edge of the first top plate 211 is connected to the connecting bracket 24, so that the first top plate 211 of the magnetic yoke 21 installs and fixes the central magnetic part 22 through the connecting bracket 24, so that the central magnetic part 22 is disposed on the side of the connecting bracket 24 facing away from the first top plate 211, and the connecting bracket 24 is used to make the central magnetic part 22 spaced from the first side plate 213 and the first top plate 211 respectively to form an air flow channel 241, and the inner peripheral edge of the second diaphragm 32 is fixed on the side of the first top plate 211 facing away from the connecting bracket 24 to increase the connection area with the second diaphragm 32.

[0087] In an embodiment, the connecting bracket 24 includes a support part 242 and a connecting part 243 protruding from the support part 242. One end of the connecting part 243 away from the support part 242 is connected to the first top plate 211, and the central magnetic part 22 is disposed on the side of the support part 242 facing away from the connecting part 243.

[0088] In this embodiment, as Figure 2 、 Figure 4 、 Figure 6 and Figure 7As shown, the connecting bracket 24 can be an integrally formed structure, that is, the connecting bracket 24 is integrally stretched to form a support portion 242 and a connecting portion 243 that are sequentially connected, such that the connecting portion 243 and the support portion 242 are arranged at an angle. Optionally, the connecting portion 243 and the support portion 242 are perpendicularly arranged. The connecting bracket 24 is connected to the first top plate 211 through one end of the connecting portion 243 away from the support portion 242, and the central magnetic portion 22 is installed and fixed by the support portion 242. In this way, the support portion 242 and the central magnetic portion 22 are supported by the connecting portion 243 of the connecting bracket 24, and are spaced from the first top plate 211, and an air flow channel 241 is enclosed between the connecting portion 243, the support portion 242 and the first top plate 211, so that the air flow channel 241 communicates with the first through hole 2111 and the first magnetic gap 25.

[0089] Optionally, there are multiple connecting portions 243, and the multiple connecting portions 243 are arranged at intervals along the periphery of the support portion 242, and the multiple connecting portions 243 are spaced and arranged around the first through hole 2111. It can be understood that by providing multiple connecting portions 243 on the connecting bracket 24, the connection stability between the connecting bracket 24 and the magnetic yoke 21 is improved. Optionally, the connecting portion 243 is connected to the first top plate 211 by welding or bonding.

[0090] In this embodiment, there are two connecting portions 243, and the two connecting portions 243 are symmetrically arranged on the support portion 242. Optionally, the connecting portion 243 and the support portion 242 are an integrally formed structure.

[0091] In order to further increase the connection area between the connecting bracket 24 and the magnetic yoke 21, in one embodiment, as Figure 7 shown, one end of the connecting portion 243 away from the support portion 242 bends and extends towards the direction close to the first top plate 211 to form an extension portion 244, and the extension portion 244 is connected to the first top plate 211. It can be understood that the extension portion 244 extends along the inner surface of the first top plate 211, and the extension portion 244 is connected to the first top plate 211 by welding or bonding, which is not limited herein.

[0092] In this embodiment, the central magnetic portion 22 is arranged in the accommodation groove 215, is connected to the connecting bracket 24, and is spaced from the first side plate 213 to enclose a first magnetic gap 25. The first bottom plate 212 is optionally connected to one end of the first side plate 213 away from the first top plate 211, and the first bottom plate 212 extends towards the direction away from the accommodation groove 215 and is arranged at an angle with the first side plate 213. The side magnetic portion 23 is arranged on one side of the first bottom plate 212 close to the second diaphragm 32 and is spaced from the first side plate 213 to enclose a second magnetic gap 26, that is, the side magnetic portion 23 and the central magnetic portion 22 are located on opposite sides of the first side plate 213.

[0093] It can be understood that the first through hole 2111 and the second through hole 324 are coaxially arranged along the vibration direction of the vibration system 3, so that the first through hole 2111 and the second through hole 324 are sequentially communicated to form a through hole. If the opening area of the through hole is too small, it is not conducive to the sound wave of the first diaphragm 31 to radiate to the outside; if the opening area of the through hole is too large, the bonding area between the central magnetic part 22 and the first top plate 211 through the connecting bracket 24 is too small, which is not conducive to improving the connection reliability between the two, and is also not conducive to the bonding of the second diaphragm 32 and the first top plate 211.

[0094] It should be noted that the first through hole 2111 can be one or more. When the first through hole 2111 is one, the second through hole 324 can be one or more, and one or more second through holes 324 are correspondingly communicated with the first through hole 2111. When the first through hole 2111 is multiple, the second through hole 324 can be one or more. At this time, when the second through hole 324 is one, the projected area of one second through hole 324 at least covers part of the first through hole 2111; when the second through hole 324 is multiple, at this time, the first through hole 2111 and the second through hole 324 are arranged in one-to-one correspondence, and vice versa, which is not limited here.

[0095] It can be understood that the through hole can be one or more. When the through hole is one, the opening area of the through hole is the opening area of one through hole. When the through hole is multiple, the opening area of the through hole is the sum of the opening areas of multiple through holes, which is not limited here.

[0096] In this embodiment, the projected area of the first top plate 211 is defined as S1, and the opening area of the through hole is defined as S2, and S2 = (10% - 80%)S1. In this embodiment, by controlling the opening area of the through hole, it is beneficial to the sound wave of the first diaphragm 31 to radiate to the outside, and it can also ensure the structural strength of the magnetic yoke 21 and the connection areas between the central magnetic part 22 and the first top plate 211 and the connecting bracket 24, thereby improving the stability.

[0097] Optionally, the opening area S2 of the through hole accounts for 10% - 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., which is not limited here.

[0098] In an implementation manner, an inclined portion 214 is formed at the connection between the first top plate 211 and the first side plate 213. Along the vibration direction of the vibration system 3, the inclined portion 214 extends obliquely from the first side plate 213 toward the direction close to the first through hole 2111, and the inner peripheral walls of the inclined portion 214 are respectively spaced from the central magnetic part 22 and the connecting bracket 24.

[0099] In this embodiment, as Figures 3 to 7As shown, by forming an inclined portion 214 at the connection of the first top plate 211 and the first side plate 213 of the magnetic yoke 21, the inclined portion 214 is used to guide the air flow in the first magnetic gap 25 and guide it to the air flow channel 241. Optionally, along the vibration direction of the vibration system 3, the inclined portion 214 extends obliquely from the first side plate 213 towards the direction close to the first through hole 2111, so that the inner peripheral walls of the inclined portion 214 are respectively spaced from the central magnetic portion 22 and the connection bracket 24, thereby ensuring the area of the air flow channel 241.

[0100] In an embodiment, the central magnetic portion 22 includes a centrally stacked magnet 221 and a central magnetic guide plate 222, and the central magnet 221 is connected to the connection bracket 24.

[0101] In this embodiment, as Figures 2 to 4 shown, the central magnet 221 is connected to the support portion 242 of the connection bracket 24, that is, the central magnet 221 is clamped between the support portion 242 and the central magnetic guide plate 222, and the outer peripheral edges of the central magnet 221 and the central magnetic guide plate 222 are both spaced from the first side plate 213 of the magnetic yoke 21 to form the first magnetic gap 25.

[0102] Optionally, the central magnet 221 and the central magnetic guide plate 222 of the central magnetic portion 22 can be circular plate-shaped or disc-shaped structures, which are not limited herein.

[0103] In an embodiment, the first bottom plate 212 is provided with an avoidance groove 2121 corresponding to the second magnetic gap 26, and the avoidance groove 2121 extends recessedly away from the second voice coil 34. In this way, the avoidance groove 2121 can provide an avoidance space for the second voice coil 34, and can increase the vibration space of the second voice coil 34, so that the acoustic performance of the sound generating device 100 can be improved.

[0104] In this embodiment, as Figures 2 to 4 shown, the edge magnetic portion 23 includes a stacked edge magnet 231 and an edge magnetic guide plate 232, and the edge magnet 231 is connected to the magnetic yoke 21. It can be understood that the edge magnet 231 is connected to the first bottom plate 212 of the magnetic yoke 21, that is, the edge magnet 231 is clamped between the first bottom plate 212 and the edge magnetic guide plate 232, and the inner peripheral edges of the edge magnet 231 and the edge magnetic guide plate 232 are both spaced from the first side plate 213 of the magnetic yoke 21 to form the second magnetic gap 26. Optionally, the edge magnet 231 and the edge magnetic guide plate 232 of the edge magnetic portion 23 can be ring structures, which are not limited herein.

[0105] In order to further improve the connection stability, in this embodiment, the side magnetic conduction plate 232 and the housing 1 are of an integrally formed structure. It can be understood that the housing 1 can be made of a metal material or a plastic material. When the housing 1 is made of a metal material, the housing 1 and the side magnetic conduction plate 232 are integrally processed, which can not only simplify the processing steps but also improve the heat dissipation effect. When the housing 1 is made of a plastic material, the housing 1 and the side magnetic conduction plate 232 can be integrally injection-molded, which is not limited herein.

[0106] Optionally, the side magnetic conduction plate 232 and the second housing 12 of the housing 1 are of an integrally formed structure, which is not limited herein. In this embodiment, the side magnetic conduction plate 232 is injection-molded on the housing 1, and the first leakage hole 121 is formed by removing material from the side magnetic conduction plate 232 and / or the corresponding housing 1 area. It can be understood that by removing material from the side magnetic conduction plate 232 or the housing 1 or both the side magnetic conduction plate 232 and the housing 1 to form the first leakage hole 121, the first leakage hole 121 does not additionally occupy the radial dimension of the sound generating device 100, or the size of the first leakage hole 121 can be increased under the limited size of the sound generating device 100 to balance the internal pressure.

[0107] In one embodiment, the first housing 11 can be a plastic housing. In this embodiment, the outer peripheral edge of the magnetic yoke 21 is integrally injection-molded with the first housing 11. It can be understood that the outer peripheral edge of the first bottom 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 housing 1.

[0108] Optionally, the first housing 11 is provided with an embedding groove, and the outer peripheral edge of the magnetic yoke 21 is provided with an embedding portion, and the embedding portion is embedded in the embedding groove.

[0109] Of course, in other embodiments, the magnetic yoke 21 and the first housing 11 can also be adhesively connected. As Figures 2 to 4 shown, a support platform 111 is convexly provided on the inner wall of the first housing 11, and the outer peripheral edge of the magnetic yoke 21 is supported on the support platform 111 and adhesively connected to the support platform 111, which is not limited herein.

[0110] In one embodiment, the second diaphragm 32 includes an inner folding ring 321, a vibrating portion 322 and an outer folding ring 323 connected in sequence. A second through hole 324 is provided on the inner side of the inner folding ring 321 and is connected to the magnetic yoke 21. The outer side of the outer folding ring 323 is connected to the housing 1, and the second voice coil 34 is connected to the vibrating portion 322.

[0111] In this embodiment, as Figures 2 to 4As shown, by setting the second diaphragm 32 to a double-folded ring structure, it is convenient for the second diaphragm 32 to be connected to the housing 1 through the outside of the outer folded ring 323 and to be connected to the magnetic yoke 21 through the inside of the inner folded ring 321, so as to achieve the sealing of the first cavity 13 and ensure that the second diaphragm 32 vibrates when the second voice coil 34 vibrates.

[0112] It can be understood that the inside of the inner folded ring 321 of the second diaphragm 32 can be an annular structure or a flat structure. When the inside of the inner folded ring 321 is an annular structure, a second through hole 324 is formed inside the inner folded ring 321; when the inside of the inner folded ring 321 is a flat structure, the flat structure is provided with a second through hole 324, which is not limited herein.

[0113] In this embodiment, the inner folded ring 321 and the outer folded ring 323 of the second diaphragm 32 are a convex structure protruding upward or a concave structure recessed downward, which is not limited herein. It can be understood that the inner folded ring 321 of the second diaphragm 32 protrudes in a direction away from the magnetic yoke 21, so as to avoid interference from the first top plate 211 of the magnetic yoke 21 when the second diaphragm 32 vibrates. Optionally, both the inner folded ring 321 and the outer folded ring 323 of the second diaphragm 32 protrude in a direction away from the magnetic circuit system 2.

[0114] Optionally, the inner folded ring 321, the vibrating part 322 and the outer folded ring 323 of the second diaphragm 32 are an integrally formed structure, so as to simplify the processing steps of the second diaphragm 32 and improve the structural strength of the second diaphragm 32.

[0115] In one embodiment, as Figure 3 and Figure 4 shown, the second diaphragm 32 further includes a vibrating plate 325, and the vibrating plate 325 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 to meet the sound generation requirements of the second diaphragm 32.

[0116] In one embodiment, the first diaphragm 31 includes a folded ring part 311 and a dome 312, the folded ring part 311 is disposed around the dome 312, the outer edge of the folded ring part 311 is connected to the housing 1, and the first voice coil 33 is connected to the dome 312.

[0117] In this embodiment, as Figures 2 to 4 shown, the folded ring part 311 and the dome 312 of the first diaphragm 31 can be an integrally formed structure or a split structure, which is not limited herein. It can be understood that the folded ring part 311 of the first diaphragm 31 is a convex structure protruding upward or a concave structure recessed downward, which is not limited herein. Optionally, the folded ring part 311 protrudes in a direction away from the magnetic circuit system 2.

[0118] It can be understood that the outer edge of the surround portion 311 is connected to the outer shell 1, and the first voice coil 33 is connected to the dome 312. Thus, when the first voice coil 33 vibrates, it drives the first diaphragm 31 to vibrate, so that the sound wave of the first diaphragm 31 radiates outward along the first magnetic gap 25, the air flow channel 241, the first through hole 2111 and the second through hole 324.

[0119] In one embodiment, the outer contour of the dome 312 is circular, and the first through hole 2111 is a circular hole. Define the diameter of the dome 312 as D1, and define the diameter of the first through hole 2111 as D2, where D2≥0.3D1.

[0120] It can be understood that the diameter of the dome 312 and the diameter of the first through hole 2111 directly affect the transmission of the sound wave of the first diaphragm 31. Through the above diameter design method, it can ensure the smooth transmission of the sound wave of the first diaphragm 31 and reduce the air flow sound.

[0121] In order to achieve the smooth transmission of the sound wave of the first diaphragm 31, in another embodiment, define the projected area of the first through hole 2111 along the vibration direction of the vibration system 3 as S1, and define the projected area of the dome 312 along the vibration direction of the vibration system 3 as S2, where S1≥8.5%*S2.

[0122] It can be understood that through the above projected area design method, it can ensure the smooth transmission of the sound wave of the first diaphragm 31 and reduce the air flow sound. In practical applications, select a suitable structural design according to specific requirements to meet the smooth transmission of the sound wave of the first diaphragm 31 and reduce the air flow sound, which is not limited here.

[0123] In one embodiment, as Figures 2 to 4 shown, the sound generating device 100 further includes a first support ring 51, and the first support ring 51 is disposed between the outer peripheral edge 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 peripheral edge of the surround portion 311 of the first diaphragm 31 and the outer shell 1, the first diaphragm 31 is convenient to pick up during the assembly process, and at the same time, the assembly accuracy is improved, and the performance of the sound generating device 100 is improved.

[0124] In one embodiment, as Figures 2 to 4 shown, the sound generating device 100 further includes a second support ring 52, and the second support ring 52 is disposed between the outer peripheral edge of the second diaphragm 32 and the outer shell 1. Optionally, the second support ring 52 can be a steel ring. By using the second support ring 52 between the outer peripheral edge of the outer surround 323 of the second diaphragm 32 and the outer shell 1, the second diaphragm 32 is convenient to pick up during the assembly process, and at the same time, the assembly accuracy is improved, and the performance of the sound generating device 100 is improved.

[0125] In one embodiment, the sound generating device 100 further includes a front cover 7. The front cover 7 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 third through hole 72 communicating the second cavity 71 with the outside.

[0126] In this embodiment, as Figures 1 to 4 shown, by providing the front cover 7, on the one hand, the front cover 7 is used to protect the first diaphragm 31, and on the other hand, the 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 the third through hole 72 in the front cover 7, the sound waves on the second side of the first diaphragm 31 can be conveniently radiated outward through the third through hole 72.

[0127] Optionally, the front cover 7 is a metal part formed by processing a metal material, which is convenient for strongly supporting the sound generating device 100 during the assembly process of the sound generating device 100 and also reduces the occupation of the overall size of the machine. In a specific application, a suitable number of third through holes 72 are set according to the actual situation, and it is not limited to a fixed number. Preferably, a damping member or a breathable film is provided on the third through hole 72, etc., which can further adjust the air flow velocity in the second cavity 71 and adjust the acoustic resistance of the second cavity 71.

[0128] In this embodiment, the sound generating device 100 of the present invention realizes sound generation by setting a double diaphragm and a double voice coil structure, and uses one magnetic circuit system 2 to drive the vibrations of two diaphragms of two voice coil bands. At the same time, without increasing the external dimensions, double-sided diaphragm sound generation is realized, increasing the vibration area of the vibration system 3, so as to achieve the purpose of performance improvement. And the double-sided diaphragms radiate 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. And the magnetic yoke 21 is set as a positive and negative stretching structure, and the central magnetic part 22 of the magnetic circuit system 2 is fixed at the inner edge of the magnetic yoke 21 through a connecting bracket 24, and the inner edge of the second diaphragm 32 is fixed by the side of the magnetic yoke 21 facing away from the connecting bracket 24. In this way, the connection area can be increased, the stability can be improved while reducing the reliability risk, and by using the first magnetic gap 25, the air flow channel 241, the first through hole 2111 of the magnetic yoke 21 and the second through hole 324 of the second diaphragm 32 to form a channel for radiating sound waves outward in sequence, the air flow circulation area when the first diaphragm 31 vibrates is effectively increased, so as to ensure smoother air flow circulation and improve the high-frequency performance of the first diaphragm 31, thereby improving the high-frequency performance after the superposition of the first diaphragm 31 and the second diaphragm 32.

[0129] The present invention also provides an electronic device, which includes the above-mentioned sound generating device 100. For the specific structure of the sound generating device 100, reference may be made to the foregoing embodiments. Since this electronic device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0130] In one embodiment, the electronic device further includes a device housing, the device housing is provided 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 sides of the first diaphragm 31 and the second diaphragm 32 communicate with the front cavity; wherein, the device housing is provided with a sound outlet hole communicating with the front cavity, and the sound waves on the first sides 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.

[0131] In this embodiment, the device housing can be a metal housing or a plastic housing, which is not limited herein. The device housing can be an integrally formed structure or a split structure, which is not limited herein. Optionally, the device housing includes an upper shell and a lower shell, and the upper shell and the lower shell can be adhesively connected or welded together to enclose and form a receiving cavity.

[0132] Optionally, the outer contour of the device housing can be a square structure. In specific applications, other suitable shapes such as a circle can be selected according to actual situations, and it is not limited to a specific shape.

[0133] It can be understood that a sound outlet hole communicating with the front cavity is provided on the upper shell of the device housing, so that the sound waves on the first sides 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.

[0134] In this embodiment, the first cavity 13 of the sound generating device 100 communicates with the rear cavity through a first leakage hole 121, and the second side of the first diaphragm 31 communicates with the rear cavity. In one embodiment, the device housing is further provided with a second leakage hole, and the second leakage hole communicates with the rear cavity.

[0135] In one embodiment, the device housing is further provided with a second leakage hole, the second leakage hole communicates with the rear cavity, and the second side of the first diaphragm 31 communicates with the rear cavity. It can be understood that a second leakage hole is provided on the lower shell of the device housing, the second leakage hole communicates with the rear cavity, the first diaphragm 31 and the second diaphragm 32 radiate sound waves with a phase opposite to that of the sound waves in the front cavity to the rear cavity, and the sound waves in the rear cavity are radiated to the outside through the second leakage hole. Optionally, a damping member for adjusting the acoustic resistance is provided on the second leakage hole.

[0136] 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, and further adjust the air pressure in the first cavity 13. At the same time, the sound waves in the rear cavity are radiated to the outside through the second leakage hole. The sound waves in the rear cavity are out of phase with the sound waves in the front cavity, which can play the role of a sound dipole, achieving the technical effects of far-field noise cancellation and protecting user privacy.

[0137] In this embodiment, the second leakage hole can be selected as a round hole, an oval hole, a polygonal hole, etc., which are not limited herein. The number of the second leakage holes can be one or more, which is specifically designed according to actual applications and is not limited herein.

[0138] 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 side wall and the second side wall together form the side wall of the electronic device housing, that is, the device housing includes a top wall and a bottom wall arranged opposite to each other and a side wall connecting the top wall and the bottom wall. Optionally, the sound outlet hole is provided on the top wall or the connection area between the side wall and the top wall, and the second leakage hole is provided on the side wall, the bottom wall or the connection area between the side wall and the bottom wall. In this way, the sound generation performance of the electronic device and the technical effect of protecting privacy can be taken into account, and the most suitable design solution can be selected according to actual needs during use. The present invention is not limited herein.

[0139] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention under the concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: The sound-generating device comprises: shell; A magnetic circuit system, the magnetic circuit system comprising a central magnetic part, a side magnetic part, a magnetic yoke and a connecting bracket, the magnetic yoke is provided with a first through hole, the central magnetic part is connected to the magnetic yoke through the connecting bracket, and is located on the circumferential inner side of the magnetic yoke, so that the inner circumferential wall of the magnetic yoke is spaced apart from the central magnetic part, a first magnetic gap is formed between the central magnetic part and the magnetic yoke, the connecting bracket, the magnetic yoke and the central magnetic part cooperate to form an air flow channel connecting the first magnetic gap and the first through hole, the side magnetic part is connected to the magnetic yoke, and a second magnetic gap is formed between the side magnetic part and the magnetic yoke, and the second magnetic gap is arranged around the first magnetic gap; and A vibration system, the vibration system comprising 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, the inner periphery of the second diaphragm is connected to the side of the magnetic yoke facing away from the connecting bracket, and the inner periphery of the second diaphragm is provided with a second through hole connected to 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 according to claim 1, characterized in that: The magnetic yoke comprises a first top plate, a first bottom plate, and a first side plate connecting the first top plate and the first bottom plate, the first top plate and the first side plate enclose a receiving groove, the first bottom plate is located on a side of the first side plate facing away from the receiving groove, and extends in a direction away from the receiving groove, and the first top plate is provided with the first through hole; The connecting bracket and the central magnetic part are both located in the accommodating groove, and the connecting bracket is connected to the first top plate, the central magnetic part is arranged on the side of the connecting bracket facing away from the first top plate, the connecting bracket and the central magnetic part are respectively spaced apart from the first side plate to form the airflow channel, the peripheral side of the central magnetic part is spaced apart from the first side plate to form the first magnetic gap, and the edge magnetic part is arranged on the first bottom plate, and is spaced apart from the first side plate to enclose and form the second magnetic gap.

3. The sound-generating device according to claim 2, characterized in that: The connecting bracket includes a supporting portion and a connecting portion protruding from the supporting portion, one end of the connecting portion away from the supporting portion is connected to the first top plate, and the central magnetic portion is arranged on a side of the supporting portion facing away from the connecting portion.

4. The sound-generating device according to claim 3, characterized in that: The connecting parts include a plurality of connecting parts, the plurality of connecting parts are arranged at intervals along the periphery of the supporting part, and the plurality of connecting parts are arranged at intervals and around the first through hole; And / or, the connecting portion and the supporting portion are an integrally formed structure; And / or, the connecting portion is connected to the first top plate by welding or bonding; And / or, one end of the connecting portion away from the supporting portion is bent and extended toward the direction close to the first top plate to form an extension portion, and the extension portion is connected to the first top plate; And / or, the connecting bracket is a metal magnetic conductive plate.

5. The sound generating device according to claim 2, characterized in that: An inclined portion is formed at the connection between the first top plate and the first side plate, and along the vibration direction of the vibration system, the inclined portion extends obliquely from the first side plate toward a direction close to the first through hole, and the inner peripheral wall of the inclined portion is spaced apart from the central magnetic portion and the connecting bracket respectively; And / or, the first bottom plate is provided with an avoidance groove corresponding to the second magnetic gap, and the avoidance groove is recessed and extends in a direction away from the second voice coil; And / or, the first top plate and the first bottom plate are connected to two ends of the first side plate along the vibration direction of the vibration system; And / or, the central magnetic part includes a central magnet and a central magnetic conductive plate which are stacked, and the central magnet is connected to the connecting bracket; And / or, the magnetic yoke is stretched integrally to form the first bottom plate, the first side plate and the first top plate which are connected in sequence.

6. The sound generating device according to claim 1, characterized in that: The outer shell includes a first shell and a second shell connected to each other, wherein one end of the first shell away from the second shell is connected to the outer periphery of the first diaphragm, the side of the second shell facing away from the first shell is connected to the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected to the first shell.

7. The sound generating device according to claim 6, characterized in that: The first shell is a plastic shell, and the outer periphery of the magnetic yoke is integrally injection-molded with the first shell; And / or, a support platform is protruding from the inner wall of the first shell, and the outer peripheral edge of the magnetic yoke is supported on and connected to the support platform; And / or, the side magnetic part includes a stacked side magnet and a side magnetic conductive plate, the side magnet is connected to the magnetic conductive yoke, and the side magnetic conductive plate and the second shell are an integrally formed structure.

8. The sound generating device according to claim 1, characterized in that: The first diaphragm includes a folding ring portion and a dome, the folding ring portion is arranged around the dome, the outer edge of the folding ring portion is connected to the housing, and the first voice coil is connected to the dome; Among them, the outer contour of the spherical top is circular, the first through hole is a circular hole, the diameter of the spherical top is defined as D1, the diameter of the first through hole is defined as D2, and D2≥0.3D1; or, the projection area of ​​the first through hole along the vibration direction of the vibration system is defined as S1, and the projection area of ​​the spherical top along the vibration direction of the vibration system is defined as S2, and S1≥8.5%*S2.

9. The sound generating device according to claim 1, characterized in that: The second diaphragm comprises an inner folding ring, a vibration part and an outer folding ring which are connected in sequence, the inner side of the inner folding ring is provided with the second through hole and is connected to the magnetic yoke, the outer side of the outer folding ring is connected to the housing, and the second voice coil is connected to the vibration part; Wherein, the second diaphragm further includes a vibration plate, and the vibration plate is arranged between the vibration part and the second voice coil.

10. The sound generating device according to claim 1, characterized in that: The first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves with the same phase outward; And / or, the second diaphragm is an annular diaphragm, the inner edge of the second diaphragm forms the second through hole, and the sound-generating device further comprises a first air-permeable member, the first air-permeable member is connected to the inner edge of the first diaphragm and covers the second through hole; And / or, a first cavity is formed between the second diaphragm, the outer shell and the magnetic yoke, the sound-emitting device is provided with a first leakage hole connecting the first cavity with the outside, and the sound-emitting device also includes a second air-permeable member covering the first leakage hole.

11. The sound generating device according to any one of claims 1 to 10, characterized in that: The sound-generating device further comprises a first supporting ring, wherein the first supporting ring is arranged between the outer periphery of the first diaphragm and the housing; And / or, the sound-generating device further comprises a second supporting ring, wherein the second supporting ring is arranged between the outer periphery of the second diaphragm and the housing; And / or, the sound-generating device further includes a front cover, the front cover is located on a side of the first diaphragm away from the second diaphragm, a second cavity is formed between the first diaphragm and the front cover, and the front cover is provided with a third through hole connecting the second cavity and the outside.

12. An electronic device, characterized in that: The electronic device comprises: A device housing, wherein the device housing is provided with a receiving cavity; and The sound-generating device according to any one of claims 1 to 11, wherein the sound-generating device is disposed in the receiving cavity and divides the receiving cavity into a front cavity and a rear cavity that are isolated from each other; The device housing is provided with a sound outlet hole connected to the front cavity, and the sound waves of the first diaphragm and the second diaphragm of the sound-generating device are radiated to the outside through the sound outlet hole.

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