Sound production apparatus and electronic device

Abstract

The present invention relates to the technical field of electroacoustic transduction. Disclosed are a sound production apparatus and an electronic device, A magnetic yoke of a magnetic circuit system of the sound production apparatus comprises a main body portion and a support portion which are integrally formed by stretching; the main body portion is provided with a first through hole; the support portion is opposite to the first through hole; a central magnetic portion is provided on the side of the support portion facing away from the first through hole and is located on the circumferential inner side of the main body portion; the central magnetic portion, the main body portion and the support portion together define an airflow channel leading to the first through hole; the central magnetic portion and the main body portion are spaced apart to form a first magnetic gap; by means of the airflow channel, the first magnetic gap leads to the first through hole; a second magnetic gap is formed between a side magnetic portion and the main body portion; a first diaphragm and a second diaphragm of a vibration system are located on two opposite sides of the magnetic circuit system; the inner periphery of the second diaphragm is connected to the main body portion and is provided with a second through hole leading to the first through hole. The sound production apparatus of the present invention not only reduces the risk of drop reliability and improves the structural firmness of the product, but also effectively improves high-frequency performance.

Description

Sound production device and electronic device TECHNICAL FIELD

[0001] The present application relates to the technical field of electro-acoustic transduction, and in particular to a sound production device and an electronic device using the same. BACKGROUND

[0002] In recent years, with the rapid development of consumer electronics, electronic devices such as earphones, smartphones, and VR devices have been widely recognized and applied by consumers. Related supporting products such as earphones have also been improved by those skilled in the art to meet the performance requirements of electronic products and the needs of consumers for product performance.

[0003] Sound production devices are important electro-acoustic transduction components in consumer electronics, and are widely used as loudspeakers, receivers, earphones, etc. With the improvement of the performance of electronic products, it is also an inevitable trend to improve the acoustic performance of sound production devices. In the related art, a sound production device is proposed, which has a first diaphragm and a second diaphragm respectively arranged on the opposite sides of a magnetic circuit system, and a center magnet and a side magnet of the magnetic circuit system are arranged on different support walls of a magnetic yoke. The inner periphery of one side diaphragm is also fixed to the top wall of the magnetic yoke. Although the above structure can improve the acoustic performance of the sound production device, the above structure design is relatively limited, the bonding area between the magnets of the magnetic circuit system and the magnetic yoke and between the diaphragm and the magnetic yoke is small, the product has a high risk of falling reliability, and the service life of the product is greatly affected. SUMMARY

[0004] The main purpose of the present application is to provide a sound production device and an electronic device, which aims to provide a sound production device that effectively improves high-frequency performance. The sound production device not only reduces the risk of falling reliability and improves the structural firmness of the product, but also effectively improves the high-frequency performance, thereby improving the sound production performance of the entire machine.

[0005] To achieve the above purpose, the present application provides a sound production device, which comprises:

[0006] a housing;

[0007] The magnetic circuit system comprises a center magnetic part, an edge magnetic part and a magnetic yoke, the magnetic yoke comprises a main body part and a support part which are integrally stretch-formed, the main body part is provided with a first through hole, the support part is opposite to the first through hole, the center magnetic part is arranged on a side of the support part which is away from the first through hole and is located on a circumferential inner side of the main body part, the center magnetic part and the main body part and the support part jointly define an airflow channel which communicates with the first through hole, a circumferential direction of the center magnetic part is spaced apart from the main body part to form a first magnetic gap, the first magnetic gap communicates with the first through hole through the airflow channel, the edge magnetic part is connected to the main body part and forms a second magnetic gap with the main body part, and the second magnetic gap is arranged around the first magnetic gap.

[0008] The vibration system comprises 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, an outer periphery of the first diaphragm is connected to the shell and is opposite and spaced apart from the magnetic circuit system, an outer periphery of the second diaphragm is connected to the shell, an inner periphery of the second diaphragm is connected to a side of the main body part which is away from the support part, and the inner periphery of the second diaphragm is provided with a second through hole which communicates with the first through hole, one end of the first voice coil is connected to the first diaphragm, 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 main body part comprises a first top plate, a first side plate and a first bottom plate which are integrally stretch-formed, 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 which is 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, the first top plate is bent and extends in a direction towards the receiving groove to form a connecting part, and the support part is connected to the connecting part and is opposite to the first through hole.

[0010] The center magnetic part is arranged on a side of the support part which is away from the first top plate and is spaced apart from the first side plate to enclose the first magnetic gap, and the edge magnetic part is arranged on a side of the first bottom plate which faces the second diaphragm and is spaced apart from the first side plate to enclose the second magnetic gap.

[0011] In an embodiment, the connecting part comprises a plurality of connecting parts, the plurality of connecting parts are arranged at intervals along a periphery of the support part, and the plurality of connecting parts are arranged at intervals and surround the first through hole.

[0012] In an embodiment, the connection between the first top plate and the first side plate forms an inclined portion, which extends obliquely from the first side plate towards the direction close to the first through hole along the vibration direction of the vibration system, and the inner circumferential wall of the inclined portion is spaced apart from the center magnetic portion and the support portion, respectively.

[0013] In an embodiment, the first bottom plate is provided with a recess corresponding to the second magnetic gap, which extends recessed towards the direction away from the second voice coil.

[0014] In an embodiment, the first top plate and the first bottom plate are located at the two ends of the first side plate along the vibration direction of the vibration system.

[0015] In an embodiment, the center magnetic portion comprises a center magnet and a center magnetic guide plate which are stacked, and the center magnet is connected with the support portion.

[0016] In an embodiment, the shell comprises a first shell and a second shell which are connected, one end of the first shell away from the second shell is connected with the outer circumferential edge of the first diaphragm, one side of the second shell away from the first shell is connected with the outer circumferential edge of the second diaphragm, and the outer circumferential edge of the main body portion is connected with the first shell.

[0017] In an embodiment, the first shell is a plastic shell, and the outer circumferential edge of the main body portion is integrally injection molded with the first shell.

[0018] In an embodiment, the inner wall of the first shell is provided with a support platform, and the outer circumferential edge of the main body portion is supported on and connected with the support platform.

[0019] In an embodiment, the edge magnetic portion comprises an edge magnet and an edge magnetic guide plate which are stacked, the edge magnet is connected with the magnetic yoke, and the edge magnetic guide plate is integrally formed with the second shell.

[0020] In an embodiment, the first diaphragm comprises a folded ring portion and a ball top, the folded ring portion is arranged around the ball top, the outer edge of the folded ring portion is connected with the shell, and the first voice coil is connected with the ball top.

[0021] In an embodiment, the outer contour of the ball top is circular, the first through hole is a circular hole, the diameter of the ball 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, the projection area of the ball top along the vibration direction of the vibration system is defined as S2, and S1≥8.5%*S2.

[0022] In an embodiment, the second vibrating diaphragm comprises, in sequence, an inner folded ring, a vibrating part and an outer folded ring, the inner side of the inner folded ring is provided with the second through hole and connected with the main body part, the outer side of the outer folded ring is connected with the shell, and the second voice coil is connected with the vibrating part.

[0023] The second vibrating diaphragm further comprises a vibrating plate arranged between the vibrating part and the second voice coil.

[0024] In an embodiment, the first vibrating diaphragm and the second vibrating diaphragm vibrate in the same direction and radiate sound waves of the same phase outward.

[0025] The second vibrating diaphragm is a ring-shaped vibrating diaphragm, the inner edge of the second vibrating diaphragm forms the second through hole, and the sound generating device further comprises a first air permeable member connected to the inner edge of the first vibrating diaphragm and covering the second through hole.

[0026] The second vibrating diaphragm, the shell and the main body part form a first cavity, the sound generating device is provided with a first leakage hole communicating the first cavity with the outside, and the sound generating device further comprises a second air permeable member covering the first leakage hole.

[0027] In an embodiment, the sound generating device further comprises a first supporting ring arranged between the outer periphery of the first vibrating diaphragm and the shell.

[0028] The sound generating device further comprises a second supporting ring arranged between the outer periphery of the second vibrating diaphragm and the shell.

[0029] The sound generating device further comprises a front cover, the periphery of the front cover is connected with the shell and located on the side of the first vibrating diaphragm away from the second vibrating diaphragm, a second cavity is formed between the first vibrating diaphragm and the front cover, and the front cover is provided with a third through hole communicating the second cavity with the outside.

[0030] The present application further provides an electronic device, which comprises:

[0031] a device shell provided with a receiving cavity; and

[0032] The sound generating device described above is arranged in the receiving cavity and divides the receiving cavity into a front cavity and a rear cavity which are isolated from each other.

[0033] The device shell is provided with a sound outlet hole communicating the front cavity, and sound waves of the first vibrating diaphragm and the second vibrating diaphragm of the sound generating device are radiated outward through the sound outlet hole.

[0034] The sound generating device of the technical scheme of the present application houses the magnetic circuit system and the vibration system in the shell, and sets the first magnetic gap and the second magnetic gap on the magnetic circuit system, so that the second magnetic gap is arranged around the first magnetic gap, and sets the vibration system as the first diaphragm, the second diaphragm, the first voice coil and the second voice coil, so that the first diaphragm and the second diaphragm are arranged on opposite sides of the magnetic circuit system and connected with the shell, and one end of the first voice coil is connected with the first diaphragm, the other end of the first voice coil is suspended in the first magnetic gap, one end of the second voice coil is connected with the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap, so that the current is passed through the first voice coil and the second voice coil, so that the first voice coil and the second voice coil convert the electric energy into mechanical energy in the first magnetic gap and the second magnetic gap formed by the magnetic circuit system, to drive the first voice coil and the second voice coil to drive the first diaphragm and the second diaphragm to vibrate, which not only drives two voice coils to drive two diaphragms to vibrate to generate sound, but also realizes the same direction sound generation of the double diaphragms without increasing the size of the shell, and increases the sound generating area of the vibration system, so as to achieve the purpose of performance improvement. Further, the magnetic circuit system is set as the center magnetic part, the side magnetic part and the magnetic yoke, the magnetic yoke is integrally stretched to form the main part and the support part, so that the center magnetic part is arranged on the side of the support part away from the first through hole and located on the inner side of the main part in the circumferential direction, and the first magnetic gap is formed between the circumferential direction of the center magnetic part and the main part, so that the support part of the magnetic yoke is used to fix the center magnetic part, thereby increasing the bonding area of the center magnet, improving the installation stability, and reducing the reliability risk. The side magnetic part is connected to the main part and forms a second magnetic gap with the main part, and the inner periphery of the second diaphragm is connected to the side of the main part away from the support part, so that the main part of the magnetic yoke is used to fix the second diaphragm to increase the connection area with the second diaphragm, and the first through hole is arranged in the main part, so that the support part is opposite to the first through hole, and the center magnetic part, the main part and the support part jointly define an airflow channel communicating with the first through hole, so that the first magnetic gap communicates with the first through hole through the airflow channel, and the second through hole communicating with the first through hole is arranged in the inner periphery of the second diaphragm, so that the first diaphragm radiates sound waves outward through the first magnetic gap, the airflow channel, the first through hole and the second through hole in sequence, to realize the outward radiation of sound waves of the first diaphragm and the second diaphragm on the same side of the sound generating device, which is beneficial to the superposition of the compressed air of the first diaphragm and the second diaphragm during vibration, improves the loudness and sensitivity of the sound generating device, and the first magnetic gap, the airflow channel, the first through hole and the second through hole are sequentially connected to form a channel for radiating sound waves outward, which effectively increases the airflow flow area during the vibration of the first diaphragm, thereby ensuring smooth airflow flow and improving the high frequency performance of the first diaphragm, thereby improving the high frequency performance of the first diaphragm and the second diaphragm after superposition. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in these drawings without creative labor.

[0036] Fig. 1 is a structural schematic diagram of an embodiment of the sound generating device provided by the present application;

[0037] Fig. 2 is an exploded schematic diagram of an embodiment of the sound generating device provided by the present application;

[0038] Fig. 3 is a cross-sectional schematic diagram of an embodiment of the sound generating device provided by the present application;

[0039] Fig. 4 is a cross-sectional schematic diagram of an embodiment of the sound generating device provided by the present application from another perspective;

[0040] Fig. 5 is a structural schematic diagram of an embodiment of the magnetic yoke provided by the present application;

[0041] Fig. 6 is a cross-sectional schematic diagram of an embodiment of the magnetic yoke provided by the present application;

[0042] Fig. 7 is a cross-sectional schematic diagram of an embodiment of the magnetic yoke provided by the present application from another perspective.

[0043] Explanation of reference numerals: 100, sound generating device; 1, shell; 11, first shell body; 111, support table; 12, second shell body; 121, first leakage hole; 13, first cavity; 2, magnetic circuit system; 21, magnetic yoke; 211, main body part; 212, first top plate; 2121, first through hole; 2122, connecting part; 213, first side plate; 214, first bottom plate; 2141, avoiding groove; 215, inclined part; 216, support part; 217, accommodating groove; 218, air flow channel; 22, center magnetic part; 221, center magnet; 222, center magnetic guide plate; 23, edge magnetic part; 231, edge magnet; 232, edge magnetic guide plate; 24, first magnetic gap; 25, second magnetic gap; 3, vibration system; 31, first diaphragm; 311, folded ring part; 312, ball top; 32, second diaphragm; 321, inner folded ring; 322, vibration part; 323, outer folded ring; 324, second through hole; 325, vibration plate; 33, first voice coil; 34, second voice coil; 41, first support ring; 42, second support ring; 51, first air permeable member; 52, second air permeable member; 6, front cover; 61, second cavity; 62, third through hole.

[0044] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0046] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.

[0047] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that three schemes are included, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B schemes are satisfied at the same time.

[0048] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person of ordinary skill in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0049] The present application proposes 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, earphones, smart wearable devices, etc., which are not limited here.

[0050] Referring to Figures 1 to 7, 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, and a magnetic yoke 21. The magnetic yoke 21 includes an integrally stretched main body 211 and a support part 216. The main body 211 has a first through hole 2121. The support part 216 is opposite to the first through hole 2121. The central magnetic part 22 is located on the side of the support part 216 facing away from the first through hole 2121 and is situated circumferentially inside the main body 211. The central magnetic part 22, the main body 211, and the support part 216 together define an airflow channel 218 communicating with the first through hole 2121. The circumferential direction of the central magnetic part 22 is spaced from the main body 211 to form a first magnetic gap 24. The first magnetic gap 24 communicates with the first through hole 2121 through the airflow channel 218. The side magnetic part 23 is connected to the main body 211. 11, and a second magnetic gap 25 is formed between the main body 211 and the second magnetic gap 25 is arranged around the first magnetic gap 24. 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. The inner periphery of the second diaphragm 32 is connected to the side of the main body 211 facing away from the support part 216. The inner periphery of the second diaphragm 32 is provided with a second through hole 324 that communicates with the first through hole 2121. 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 24. 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 25.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] In this embodiment, the sound waves from the first diaphragm 31 radiate outward through the first magnetic gap 24, the airflow channel 218, the first through hole 2121, and the second 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 first magnetic gap 24, the airflow channel 218, the first through hole 2121, and the second 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.

[0057] 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.

[0058] 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.

[0059] Optionally, the shell 1 is in a cylindrical structure, i.e. the shell 1 has openings at both ends, in a circular cylindrical structure with both ends open. The outer periphery of the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 is roughly the same, and is similar to the outer shape of the shell 1. The first diaphragm 31 and the second diaphragm 32 are respectively connected to the openings at both ends of the shell 1. The magnetic circuit system 2 and the like are arranged in the cavity of the shell 1 and located between the first diaphragm 31 and the second diaphragm 32. Thus, the regular design of the sound generating device 100 is facilitated, and the sound generating device 100 is further facilitated to be assembled in the whole machine, and the reserved structure of the whole machine is simplified.

[0060] In the embodiment, as shown in FIGS. 1 to 4, the shell 1 includes a first shell 11 and a second shell 12 connected together. The first shell 11 is connected to the outer periphery of the first diaphragm 31 away from the second shell 12. The second shell 12 is connected to the outer periphery of the second diaphragm 32 away from the first shell 11. The outer periphery of the main body 211 is connected to the first shell 11.

[0061] It can be understood that the first shell 11 and the second shell 12 of the shell 1 are optionally in a cylindrical shape, so that the first shell 11 and the second shell 12 are adaptively connected to form the cylindrical shell 1. By designing the shell 1 as the first shell 11 and the second shell 12 arranged separately, the first diaphragm 31 can be assembled by the first shell 11, and the second diaphragm 32 can be assembled by the second shell 12, which facilitates the assembly of the sound generating device 100 during the assembly process. In the embodiment, the first shell 11 and the second shell 12 of the shell 1 are respectively provided with conductive terminals, which facilitates the electrical connection between the first voice coil 33 and the second voice coil 34 and the external circuit, and the like.

[0062] In this embodiment, the magnetic circuit system 2 is configured as a central magnetic part 22, a side magnetic part 23, and a magnetic yoke 21. The magnetic yoke 21 can be a metal magnetic plate. The magnetic yoke 21 is integrally stretched to form a main body 211 and a support part 216. The central magnetic part 22 is fixed by the support part 216 of the magnetic yoke 21, so that the central magnetic part 22 is located on the side of the support part 216 opposite to the first through hole 2121 and is located on the circumferential inner side of the main body 211. A first magnetic gap 24 is formed between the central magnetic part 22 and the main body 211 in the circumferential direction, thereby increasing the bonding area of ​​the central magnetic part 22, improving installation stability, and reducing reliability risks. The side magnetic part 23 is installed and fixed by the main body 211 of the magnetic yoke 21, so that a second magnetic gap 25 is formed between the side magnetic part 23 and the main body 211. The side magnetic part 23 is located on the outside of the central magnetic part 22, so that the second magnetic gap 25 is circumferential. The first voice coil 33 and the second voice coil 34 of the vibration system 3 are arranged around the first magnetic gap 24, so that they correspond to the first magnetic gap 24 and the second magnetic gap 25 respectively. Conductive terminals are provided on the outer shell 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 within the first magnetic gap 24 and the second magnetic gap 25 formed by the magnetic circuit system 2, respectively. This drives 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 one magnetic circuit system 2, but it also achieves sound production of both diaphragms in the same direction without increasing the size of the external structure, and increases the sound production area of ​​the vibration system 3, thereby achieving the purpose of performance improvement.

[0063] In order to achieve the sound waves from the first side of the first diaphragm 31 and the second diaphragm 32 radiating outward on the same side of the sound-generating device 100, and to enhance the sound waves by superimposing them, thereby improving the high-frequency performance. In this embodiment, a first through hole 2121 is provided in the main body 211, so that the support part 216 is opposite to the first through hole 2121. The central magnetic part 22, together with the main body 211 and the support part 216, defines an airflow channel 218 that connects to the first through hole 2121. The first magnetic gap 24 is connected to the first through hole 2121 through the airflow channel 218. The inner periphery of the second diaphragm 32 is connected to the side of the main body 211 facing away from the support part 216. A second through hole 324 that connects to the first through hole 2121 is provided on the inner periphery of the second diaphragm 32. In this way, the sound waves on the first side of the first diaphragm 31 radiate outward sequentially through the first magnetic gap 24, the airflow channel 218, the first through hole 2121 and the second through hole 324. That is, the first magnetic gap 24, the airflow channel 218, the first through hole 2121 and the second through hole 324 are connected. The 24 channels are connected sequentially to form a channel for outward radiation of sound waves. This allows the sound waves of the first diaphragm 31 and the second diaphragm 32 to radiate outward from the same side of the sound-generating device 100. This 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 central magnetic part 22 and the second diaphragm 32 are fixed by using the support part 216 and the main body part 211 of the magnetic yoke 21 to improve the installation stability and reduce the reliability risk. Furthermore, the channel for outward radiation of sound waves formed by the first magnetic gap 24, the airflow channel 218, the first through hole 2121 and the second 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. This, in turn, improves the high-frequency performance of the superimposed first diaphragm 31 and the second diaphragm 32.

[0064] The sound production device 100 of the present application houses the magnetic circuit system 2 and the vibration system 3 in the housing 1, and sets the first magnetic gap 24 and the second magnetic gap 25 on the magnetic circuit system 2, so that the second magnetic gap 25 is set around the first magnetic gap 24, and sets the vibration system 3 as the first diaphragm 31, the second diaphragm 32, the first voice coil 33 and the second voice coil 34, so that the first diaphragm 31 and the second diaphragm 32 are respectively set on the opposite sides of the magnetic circuit system 2 and connected with the housing 1, and one end of the first voice coil 33 is connected with the first diaphragm 31, the other end of the first voice coil 33 is suspended in the first magnetic gap 24, one end of the second voice coil 34 is connected with the second diaphragm 32, the other end of the second voice coil 34 is suspended in the second magnetic gap 25, so that the 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 respectively convert the electric energy into mechanical energy in the first magnetic gap 24 and the second magnetic gap 25 formed by the magnetic circuit system 2, 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, which not only drives two diaphragms to vibrate to produce sound through one magnetic circuit system 2, but also realizes the same direction sound production of the double diaphragms without increasing the size, and increases the sound production area of the vibration system 3, so as to achieve the purpose of performance improvement.Furthermore, by configuring the magnetic circuit system 2 as a central magnetic part 22, a side magnetic part 23, and a magnetically conductive yoke 21, and by integrally stretching the magnetically conductive yoke 21 to form a main body 211 and a support part 216, the central magnetic part 22 is positioned on the side of the support part 216 opposite to the first through hole 2121 and located circumferentially inside the main body 211, with a first magnetic gap 24 formed circumferentially between the central magnetic part 22 and the main body 211. Thus, the support part 216 of the magnetically conductive yoke 21 fixes the central magnetic part 22, thereby increasing the strength of the central magnetic part 22. The bonding area is increased, improving installation stability and reducing reliability risks. The edge magnetic part 23 is connected to the main body part 211, forming a second magnetic gap 25 between them. The inner periphery of the second diaphragm 32 is connected to the side of the main body part 211 facing away from the support part 216. In this way, the second diaphragm 32 is fixed by the main body part 211 of the magnetic yoke 21, thereby increasing the connection area with the second diaphragm 32. Furthermore, by providing a first through hole 2121 in the main body part 211, the support part 216 is positioned opposite the first through hole 2121, and the central magnetic part is utilized. Together with the main body 211 and the support 216, the 22 forms an airflow channel 218 that connects to the first through hole 2121, allowing the first magnetic gap 24 to communicate with the first through hole 2121 through the airflow channel 218. A second through hole 324 connecting to the first through hole 2121 is provided on the inner periphery of the second diaphragm 32. This allows the first diaphragm 31 to radiate sound waves outward sequentially through the first magnetic gap 24, the airflow channel 218, the first through hole 2121, and the second through hole 324, thereby achieving sound wave generation between the first diaphragm 31 and the second diaphragm 32. The outward radiation from the same side of the device 100 facilitates the superposition of compressed air during the vibration of the first diaphragm 31 and the second diaphragm 32, enhancing the loudness and sensitivity of the sound-generating device 100. Furthermore, the sequential connection of the first magnetic gap 24, airflow channel 218, first through-hole 2121, and second through-hole 324 forms a channel for outward sound wave radiation, effectively increasing the airflow area during the vibration of the first diaphragm 31. This ensures smoother airflow, improves the high-frequency performance of the first diaphragm 31, and consequently enhances the high-frequency performance of the superimposed first diaphragm 31 and the second diaphragm 32.

[0065] The sound-generating device 100 of the present invention can be applied in various 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. 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 connected to 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.

[0066] 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.

[0067] 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 through the outlet and received by the user; furthermore, the rear cavity sound waves can optionally radiate through the rear leakage hole, thus enabling the front and rear cavity sound waves to form an acoustic dipole, achieving the technical effect of reducing sound leakage. Alternatively, the rear cavity sound waves may not radiate outwards; in this case, the sound-generating device 100 of the present invention 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 should be chosen based on the actual situation.

[0068] In one embodiment, the second diaphragm 32 is an annular diaphragm, and a second through hole 324 is formed on the inner edge of the second diaphragm 32. The sound generating device 100 also includes a first venting member 51, which is connected to the inner edge of the first diaphragm 31 and covers the second through hole 324.

[0069] 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 second through hole 324 is formed on the inner edge of the second diaphragm 32. That is, a second 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 51, which is connected to the inner edge of the second diaphragm 32 and covers the second through hole 324, the first venting member 51 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.

[0070] In one embodiment, a first cavity 13 is formed between the second diaphragm 32, the outer shell 1, and the main body 211. The sound-generating device 100 is provided with a first leakage hole 121 that connects the first cavity 13 to the outside. The sound-generating device 100 also includes a second ventilator 52 that covers the first leakage hole 121.

[0071] In this embodiment, as shown in Figures 2 to 4, the second diaphragm 32 of the vibration system 3, the outer shell 1, and the main body 211 of the magnetic yoke 21 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.

[0072] 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.

[0073] In this embodiment, by providing a second venting element 52 at the first leakage hole 121 and covering the first leakage hole 121 with the second venting element 52, 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.

[0074] 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 52 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.

[0075] In one embodiment, the main body 211 includes an integrally stretched first top plate 212, a first side plate 213, and a first bottom plate 214. The first top plate 212 and the first side plate 213 enclose a receiving groove 217. The first bottom plate 214 is located on the side of the first side plate 213 facing away from the receiving groove 217 and extends in a direction away from the receiving groove 217. The first top plate 212 is provided with a first through hole 2121. The first top plate 212 bends and extends toward the receiving groove 217 to form a connecting part 2122. The supporting part 216 is connected to the connecting part 2122 and is opposite to the first through hole 2121. The central magnetic part 22 is provided on the side of the supporting part 216 facing away from the first top plate 212 and is spaced apart from the first side plate 213 to enclose a first magnetic gap 24. The side magnetic part 23 is provided on the side of the first bottom plate 214 facing the second diaphragm 32 and is spaced apart from the first side plate 213 to enclose a second magnetic gap 25.

[0076] In this embodiment, as shown in Figures 2 to 7, the magnetic yoke 21 is an integrally formed structure, that is, the magnetic yoke 21 is integrally stretched to form a first base plate 214, a first side plate 213, a first top plate 212, a connecting part 2122 and a supporting part 216 connected in sequence, so that the first base plate 214, the first side plate 213 and the first top plate 212 form the main body 211. This design can reduce the structural complexity of the magnetic yoke 21 and reduce the molding difficulty of the magnetic yoke 21.

[0077] Understandably, the first side plate 213 of the main body 211 may optionally surround the periphery of the first top plate 212 and be set at an angle to the first top plate 212. The first side plate 213 and the first top plate 212 enclose each other to form a receiving groove 217, and the first bottom plate 214 is located on the side of the first side plate 213 facing away from the receiving groove 217. In this embodiment, the central magnetic part 22 and the support part 216 are located inside the receiving groove 217 of the main body 211, and the side magnetic part 23 is located outside the receiving groove 217 of the main body 211. That is, the side magnetic part 23 and the central magnetic part 22 are located on opposite sides of the first side plate 213, and both the side magnetic part 23 and the central magnetic part 22 are spaced apart from the first side plate 213, forming a second magnetic gap 25 and a first magnetic gap 24, respectively.

[0078] Optionally, the first top plate 212 and the first bottom plate 214 of the main body 211 are located at 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 212 and the first bottom plate 214 of the main body 211 are distributed vertically along the vibration direction of the vibration system 3, that is, the first top plate 212 and the first bottom plate 214 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.

[0079] In this embodiment, the first top plate 212 of the main body 211 of the magnetic yoke 21 is annular, and a first through hole 2121 is formed in the center of the first top plate 212. The inner periphery of the first top plate 212 bends and extends into the receiving groove 217 to form a connecting part 2122. The support part 216 is connected to the connecting part 2122 and is opposite to the first through hole 2121, so that the magnetic yoke 21 is fixed to the central magnetic part 22 through the support part 216. The central magnetic part 22 is located on the side of the support part 216 away from the first top plate 212 of the main body 211. The support part 216 is used to make the central magnetic part 22 spaced apart from the first side plate 213 and the first top plate 212 of the main body 211 to form an airflow channel 218. The inner periphery of the second diaphragm 32 is fixed on the side of the first top plate 212 away from the support part 216 to increase the connection area with the second diaphragm 32.

[0080] Optionally, the first top plate 212 of the main body 211 is integrally formed with the support portion 216 via the connecting portion 2122. In this embodiment, the connecting portion 2122 and the support portion 216 are arranged at an angle; alternatively, the connecting portion 2122 and the support portion 216 are arranged perpendicularly. The support portion 216 is connected to the first top plate 212 via the end of the connecting portion 2122 away from the support portion 216, and the central magnet portion 22 is mounted and fixed using the support portion 216. Thus, the connecting portion 2122 supports the support portion 216 and the central magnet portion 22, and spaced them from the first top plate 212. An airflow channel 218 is formed between the connecting portion 2122, the support portion 216, and the first top plate 212, thereby allowing the airflow channel 218 to connect the first through hole 2121 and the first magnetic gap 24.

[0081] Optionally, the connecting portions 2122 include multiple portions, which are spaced apart along the periphery of the support portion 216 and are spaced apart and surround the first through hole 2121. It can be understood that by providing multiple connecting portions 2122, the first top plate 212 of the main body portion 211 improves the structural strength of the magnetic yoke 21.

[0082] In this embodiment, there are two connecting portions 2122, which are symmetrically arranged on the support portion 216. Optionally, the connecting portions 2122 and the support portion 216 are integrally formed.

[0083] Understandably, the central magnetic part 22 is disposed within the receiving groove 217 and connected to the support part 216, and is spaced apart from the first side plate 213 to form a first magnetic gap 24. The first bottom plate 214 is optionally connected to the end of the first side plate 213 away from the first top plate 212, and the first bottom plate 214 extends in a direction away from the receiving groove 217 and is set at an angle to the first side plate 213. The side magnetic part 23 is disposed on the first bottom plate 214 and is spaced apart from the first side plate 213 to form a second magnetic gap 25, that is, the side magnetic part 23 and the central magnetic part 22 are located on opposite sides of the first side plate 213.

[0084] Optionally, the first through hole 2121 and the second through hole 324 are coaxially arranged along the vibration direction of the vibration system 3, so that the first through hole 2121 and the second through hole 324 are connected in sequence to form a through hole. If the opening area of ​​the through hole is too small, it is not conducive to the radiation of sound waves from the first diaphragm 31 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 212 through the support part 216 is too small, which is not conducive to improving the connection reliability between the two, and is also not conducive to the bonding between the second diaphragm 32 and the first top plate 212.

[0085] It should be noted that there can be one or more first through holes 2121. When there is only one first through hole 2121, there can be one or more second through holes 324, and the one or more second through holes 324 are connected to the first through hole 2121. When there are multiple first through holes 2121, there can be one or more second through holes 324. In this case, when there is only one second through hole 324, the projected area of ​​the second through hole 324 must at least cover part of the first through hole 2121; when there are multiple second through holes 324, the first through holes 2121 and the second through holes 324 are set in a one-to-one correspondence, and vice versa. No limitation is made here.

[0086] Understandably, there can be one or more through holes. When there is only one through hole, its opening area is the same as the opening area of ​​that single through hole. When there are multiple through holes, their opening areas are the sum of the opening areas of all the through holes, without any limitation here.

[0087] In this embodiment, the projected area of ​​the first top plate 212 is defined as S1, and the opening area of ​​the through hole is defined as S2, where S2 = (10%~80%)S1. In this embodiment, by controlling the opening area of ​​the through hole, 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 support part 216, thereby improving stability.

[0088] Optionally, the opening area S2 of the through hole accounts for 10% to 80% of the projected area S1 of the first top plate 212. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc., and is not limited here.

[0089] In one embodiment, an inclined portion 215 is formed at the connection between the first top plate 212 and the first side plate 213. Along the vibration direction of the vibration system 3, the inclined portion 215 extends inclinedly from the first side plate 213 toward the direction close to the first through hole 2121. The inner peripheral wall of the inclined portion 215 is spaced apart from the central magnet portion 22 and the support portion 216, respectively.

[0090] In this embodiment, as shown in Figures 3 to 7, an inclined portion 215 is formed at the connection between the first top plate 212 and the first side plate 213 of the magnetic yoke 21. This inclined portion 215 guides the airflow within the first magnetic gap 24 to the airflow channel 218. Optionally, along the vibration direction of the vibration system 3, the inclined portion 215 extends obliquely from the first side plate 213 toward the direction close to the first through hole 2121. This ensures that the inner peripheral wall of the inclined portion 215 is spaced apart from the central magnetic portion 22 and the support portion 216, thereby guaranteeing the area of ​​the airflow channel 218.

[0091] In one embodiment, the central magnetic part 22 includes a central magnet 221 and a central magnetic guide plate 222 stacked together, and the central magnet 221 is connected to the support part 216.

[0092] In this embodiment, as shown in Figures 2 to 4, the central magnet 221 is connected to the support portion 216, that is, the central magnet 221 is sandwiched between the support portion 216 and the central magnetic guide plate 222. The outer periphery of the central magnet 221 and the central magnetic guide plate 222 are spaced apart from the first side plate 213 of the magnetic guide yoke 21 to form a first magnetic gap 24.

[0093] Optionally, the central magnet 221 and the central magnetic plate 222 of the central magnetic part 22 can be selected as circular plate or disk structure, which is not limited here.

[0094] In one embodiment, the first base plate 214 is provided with a clearance groove 2141 corresponding to the second magnetic gap 25. The clearance groove 2141 extends recessedly in a direction away from the second voice coil 34. In this way, the clearance groove 2141 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.

[0095] In this embodiment, as shown in Figures 2 to 4, the side magnetic section 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 side of the first base plate 214 of the magnetic yoke 21 near the second diaphragm 32, that is, the side magnet 231 is sandwiched between the first base plate 214 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 25. Optionally, the side magnet 231 and the side magnetic guide plate 232 of the side magnetic section 23 can be a ring structure, which is not limited here.

[0096] 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.

[0097] 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.

[0098] In one embodiment, the first housing 11 may be a plastic housing. In this embodiment, the outer periphery of the main body 211 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 214 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.

[0099] Optionally, the first housing 11 is provided with an embedding groove, and the outer periphery of the main body 211 of the magnetic yoke 21 is provided with an embedding part, which is embedded in the embedding groove.

[0100] Of course, in other embodiments, the magnetic yoke 21 and the first housing 11 can also be bonded together. As shown in Figures 2 to 4, the inner wall of the first housing 11 is provided with a support platform 111, the outer periphery of the main body 211 is supported on the support platform 111 and connected to the support platform 111, that is, the outer periphery of the first base plate 214 is supported on the support platform 111 and bonded together with the support platform 111, which is not limited here.

[0101] 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 second through hole 324 on its inner side and is connected to the main body 211. 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.

[0102] 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 main body 211 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.

[0103] Understandably, the inner side of the inner fold ring 321 of the second diaphragm 32 can be a ring structure or a plate structure. When the inner side of the inner fold ring 321 is a ring structure, a second 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 plate structure, the plate structure is provided with a second through hole 324, which is not limited here.

[0104] 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 convexes in a direction away from the magnetic yoke 21, thus avoiding interference from the first top plate 212 of the magnetic yoke 21 when the second diaphragm 32 vibrates. Optionally, both the inner fold 321 and outer fold 323 of the second diaphragm 32 convex in a direction away from the magnetic circuit system 2.

[0105] 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.

[0106] In one embodiment, as shown in Figures 3 and 4, 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, thereby meeting the sound production requirements of the second diaphragm 32.

[0107] 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.

[0108] 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.

[0109] 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 first magnetic gap 24, the airflow channel 218, the first through hole 2121 and the second through hole 324.

[0110] In one embodiment, the outer contour of the dome 312 is circular, the first through hole 2121 is a circular hole, the diameter of the dome 312 is defined as D1, the diameter of the first through hole 2121 is defined as D2, and D2≥0.3D1.

[0111] Understandably, the diameter of the dome 312 and the diameter of the first through hole 2121 directly affect the transmission of sound waves from the first diaphragm 31. By using the above-mentioned diameter design method, it is possible to ensure that the sound waves from the first diaphragm 31 are transmitted smoothly and reduce airflow noise.

[0112] In order to ensure the smooth transmission of sound waves from the first diaphragm 31, in another embodiment, the projected area of ​​the first through hole 2121 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.

[0113] 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.

[0114] In one embodiment, as shown in Figures 2 to 4, the sound-generating device 100 further includes a first support ring 41, which is disposed between the outer periphery of the first diaphragm 31 and the outer shell 1. Optionally, the first support ring 41 can be a steel ring. By using the first support ring 41 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.

[0115] In one embodiment, as shown in Figures 2 to 4, the sound-generating device 100 further includes a second support ring 42, which is disposed between the outer periphery of the second diaphragm 32 and the outer shell 1. Optionally, the second support ring 42 can be a steel ring. The use of the second support ring 42 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.

[0116] In one embodiment, the sound-generating device 100 further includes a front cover 6, the periphery of which is connected to the outer shell 1 and located on the side of the first diaphragm 31 away from the second diaphragm 32. A second cavity 61 is formed between the first diaphragm 31 and the front cover 6. The front cover 6 is provided with a third through hole 62 that connects the second cavity 61 to the outside.

[0117] In this embodiment, as shown in Figures 1 to 4, by providing a front cover 6, the first diaphragm 31 is protected, and a second cavity 61 is formed between the front cover 6 and the first diaphragm 31 to ensure the amplitude of the first diaphragm 31. It can be understood that by providing a third through hole 62 in the front cover 6, sound waves from the second side of the first diaphragm 31 can be radiated outwards through the third through hole 62.

[0118] Optionally, the front cover 6 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, the number of third through holes 62 is set according to actual conditions and is not limited to a fixed number. Preferably, the third through holes 62 are provided with damping elements or venting membranes, which can further adjust the airflow velocity of the second cavity 61 and adjust the acoustic impedance of the second cavity 61.

[0119] 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 sound generation area of ​​the vibration system 3 and thus achieving the purpose of performance improvement. 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 integrally formed with a main body 211 and a support 216, making the main body 211 a forward and reverse stretched structure. The connecting part 2122 formed by bending at the inner edge of the main body 211 is integrally formed with the support 216. The support 216 is used to fix the central magnetic part 22 of the magnetic circuit system 2, and the inner edge of the second diaphragm 32 is fixed by the side of the main body 211 of the magnetic yoke 21 facing away from the support 216. This increases the connection area, improves stability, and reduces reliability risks. By sequentially connecting the first magnetic gap 24, the airflow channel 218 and the first through hole 2121 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, 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 superimposed first diaphragm 31 and the second diaphragm 32.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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 or the side wall and the top wall, and the second leakage hole is located in the connection area between the side wall, the bottom wall, or 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.

[0130] 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 under the concept of the present invention using the description and drawings 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 includes a central magnetic part, a side magnetic part, and a magnetic yoke. The magnetic yoke includes an integrally stretched main body and a support part. The main body has a first through hole. The support part is opposite to the first through hole. The central magnetic part is located on the side of the support part away from the first through hole and is located circumferentially inside the main body. The central magnetic part, the main body, and the support part together define an airflow channel communicating with the first through hole. The circumferential direction of the central magnetic part is spaced from the main body to form a first magnetic gap. The first magnetic gap communicates with the first through hole through the airflow channel. The side magnetic part is connected to the main body and forms a second magnetic gap with the main body. The second magnetic gap is arranged around 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. The inner periphery of the second diaphragm is connected to the side of the main body facing away from the support portion, and the inner periphery of the second diaphragm is provided with a second 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 main body includes an integrally stretched first top plate, a first side plate, and a first bottom plate. The first top plate and the first side plate form 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 a first through hole. The first top plate is bent and extended into the receiving groove to form a connecting part. The supporting part is connected to the connecting part and is opposite to the first through hole. The central magnetic part is located on the side of the support part facing away from the first top 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 facing the second diaphragm, 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 connecting portion includes a plurality of connecting portions, which are spaced apart along the periphery of the support portion, and are spaced apart and surround the first through hole.

4. The sound-generating device as described in claim 2, characterized in that, An inclined portion 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 portion extends inclinedly from the first side plate toward the direction close to the first through hole. The inner peripheral wall of the inclined portion is spaced apart from the central magnetic portion and the support portion, respectively. 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 located at both 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 plate stacked together, and the central magnet is connected to the support part.

5. 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 periphery 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 main body is connected to the first casing.

6. The sound-generating device as described in claim 5, characterized in that, The first housing is a plastic housing, and the outer periphery of the main body is integrally injection molded with the first housing; And / or, the inner wall of the first housing is provided with a support platform, the outer periphery of the main body is supported on the support platform and connected 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.

7. The sound-generating device as claimed in claim 1, characterized in that, The first diaphragm includes a surround portion and a dome, the surround portion is disposed around the dome, the outer edge of the surround portion is connected to the housing, and the first voice coil is connected to the dome; Wherein, the outer contour of the dome is circular, the first through hole is a circular hole, the diameter of the dome is defined as D1, the diameter of the first through hole is defined as D2, D2≥0.3D1; or, the projected area of ​​the first through hole along the vibration direction of the vibration system is defined as S1, the projected area of ​​the dome along the vibration direction of the vibration system is defined as S2, S1≥8.5%*S2.

8. 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 side of the inner folded ring is provided with the second through hole and is connected to the main body. 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.

9. 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 second 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 second through hole; And / or, a first cavity is formed between the second diaphragm, the outer shell, and the main body, the sound-generating device is provided with a first leakage hole connecting the first cavity to the outside, and the sound-generating device further includes a second ventilator covering the first leakage hole.

10. The sound-generating device as described in any one of claims 1 to 9, 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 periphery of which is connected to the outer shell and located on the 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 with the second cavity and the outside.

11. 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 10 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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