Sound production device and electronic device

Abstract

The utility model discloses a sound production device and electronic equipment relates to electric sound transduction technical field, this sound production device includes magnetic circuit system, and magnetic circuit system has magnetic gap, the magnetic circuit system includes magnetic yoke and with magnetic yoke connection's magnet assembly, the magnet assembly adopts neodymium iron boron material, and with magnetic yoke integral hot press forming, wherein, magnetic yoke is equipped with accommodating space, and magnetic yoke has the first side and the second side of setting away from each other, the magnet assembly includes the main part of being located at the first side and the convex part of inducting the accommodating space, the outer periphery of convex part and the inner wall of accommodating space are in close contact and set up. The utility model discloses a sound production device not only realizes magnetic circuit ultrathin design, increases magnet volume of magnetic circuit system simultaneously, to improve the sound production performance of sound production device, and make the structural reliability of magnetic circuit system good, and it is not easy to break, improve the use stability of product.

Description

Technical Field

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

[0002] In recent years, with the rapid development of the smart electronics field, consumer electronics products have ushered in a new wave of innovation. Foldable electronic products have gradually entered the market, and various terminal manufacturers have successively launched ultra-thin foldable products, such as foldable phones, foldable tablets, and foldable laptops. Smartphones have even seen double-folding or triple-folding products in the X or Y direction, which requires the single-sided thickness of the device to become thinner and thinner.

[0003] As a crucial electroacoustic transducer in consumer electronics, loudspeakers are also undergoing further thinning to keep pace with the trend towards thinner and lighter designs. This presents significant challenges to the internal space design and reliability of loudspeakers. In related technologies, as the external thickness of loudspeakers decreases, the thickness of internal components must also be reduced, such as magnets, magnetic plates, and yokes. The thinning of magnets, in particular, greatly increases the operational risks of loudspeakers. Due to their brittle nature, magnets are highly susceptible to breakage after thinning, resulting in significant yield losses and low mass production feasibility. Utility Model Content

[0004] The main purpose of this utility model is to provide a sound-generating device and an electronic device. The aim is to provide a sound-generating device that improves the reliability of the magnetic circuit system. This sound-generating device not only achieves an ultra-thin magnetic circuit design, but also increases the magnet volume of the magnetic circuit system, thereby improving the sound-generating performance of the sound-generating device. In addition, it makes the magnetic circuit system structurally reliable, not easy to break, and improves the stability of the product in use.

[0005] To achieve the above objectives, this utility model proposes a sound-generating device, which includes a magnetic circuit system having a magnetic gap. The magnetic circuit system includes a magnetic yoke and a magnet assembly connected to the magnetic yoke. The magnet assembly is made of neodymium iron boron material and is integrally hot-pressed with the magnetic yoke.

[0006] The magnetic yoke has a receiving space and has a first side and a second side that are opposite to each other. The magnet assembly includes a main body part disposed on the first side and a protrusion part extending into the receiving space. The outer periphery of the protrusion part is fitted to the inner wall of the receiving space.

[0007] In one embodiment, the accommodating space is a groove structure provided on the first side;

[0008] Alternatively, the accommodating space may be a through-hole structure that connects the first side and the second side;

[0009] Alternatively, the accommodating space extends through the first side and the second side, and the side of the protrusion facing away from the main body is flush with the second side.

[0010] In one embodiment, the magnet assembly includes a central magnet and a side magnet, the side magnet being located outside the central magnet and spaced apart from the central magnet to form the magnetic gap, both the central magnet and the side magnet being made of neodymium iron boron material and integrally hot-pressed with the magnetic yoke;

[0011] The central magnet includes the main body and the protrusion.

[0012] In one embodiment, the sound-generating device further includes a vibration system disposed opposite to the magnetic circuit system. The vibration system includes a diaphragm assembly and a voice coil. One end of the voice coil is connected to the diaphragm assembly, and the other end of the voice coil is disposed corresponding to the magnetic gap. The magnetic circuit system drives the voice coil to reciprocate along a first direction. Along the first direction, the magnetic yoke has a first yoke plate disposed opposite to the magnetic gap.

[0013] Wherein, the outer peripheral wall of the first yoke plate is respectively fitted to the side wall of the central magnet and the side magnet; and / or, the first yoke plate is provided with a recessed groove extending along the first direction corresponding to the magnetic gap, the recessed groove being used to avoid the voice coil.

[0014] In one embodiment, the side magnets form a closed, integral ring structure and are arranged around the central magnet;

[0015] Alternatively, the side magnets may include multiple side magnets, with adjacent side magnets connected end to end to form a closed ring structure, and arranged around the central magnet;

[0016] Alternatively, the side magnets may include a plurality of them, which are spaced apart and arranged around the central magnet to form a first gap between adjacent side magnets.

[0017] In one embodiment, the magnetic circuit system further includes a magnetic guide plate assembly, which includes a central magnetic guide plate and side magnetic guide plates. The central magnetic guide plate is disposed on the side of the central magnet facing away from the magnetic guide yoke, and the side magnetic guide plates are disposed on the side of the side magnet facing away from the magnetic guide yoke.

[0018] Wherein, the side magnetic plates form a closed integral ring structure; or, the side magnetic plates include multiple ones, and adjacent side magnetic plates are connected end to end to form a closed ring structure; or, the side magnetic plates include multiple ones, and the multiple side magnetic plates are spaced apart to form a second gap between adjacent side magnetic plates.

[0019] And / or, the side magnetic plate is square, and sound-permeable holes are provided at the four corners of the side magnetic plate;

[0020] And / or, the side magnetic plate has a groove extending along the first direction on the side facing away from the side magnet, the groove being used to avoid the lead portion of the voice coil.

[0021] In one embodiment, the magnet assembly includes a central magnet, a side magnet, and a common magnet. The side magnet is located outside the central magnet and the common magnet. The central magnet, the side magnet, and the common magnet are all made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke. The central magnet and the common magnet each include the main body portion and the protrusion portion.

[0022] The central magnet includes at least two, and the shared magnet includes at least one. Each of the shared magnets is located between two adjacent central magnets and is spaced apart from the central magnets.

[0023] Wherein, the central magnet and the common magnet are arranged at intervals along the second direction, and each of the central magnets is spaced apart from the side magnets and the common magnet to form the magnetic gap; or, the magnetic gap includes a first magnetic gap and a second magnetic gap, the central magnet is spaced apart from the side magnets and the common magnet to form the first magnetic gap, and the central magnet is spaced apart from two adjacent common magnets to form the second magnetic gap.

[0024] In one embodiment, the central magnet includes two, and the common magnet includes one. The two central magnets are located on opposite sides of the common magnet. The magnetic yoke has a first yoke plate and a second yoke plate disposed opposite to the magnetic gap. The outer peripheral wall of the first yoke plate is respectively fitted to the side walls of the central magnet and the side magnet, and the outer peripheral wall of the second yoke plate is respectively fitted to the side walls of the central magnet and the common magnet. And / or, the first yoke plate and the second yoke plate are provided with recessed grooves for avoiding the voice coil corresponding to the magnetic gap.

[0025] And / or, the side magnets form a closed, integral ring structure and are arranged around the central magnet and the common magnet; or, the side magnets include multiple ones, with adjacent side magnets connected end to end to form a closed ring structure and arranged around the central magnet and the common magnet; or, the side magnets include multiple ones, with multiple side magnets spaced apart and arranged around the central magnet and the common magnet, so that a first gap is formed between adjacent side magnets;

[0026] And / or, the common magnet extends along a third direction perpendicular to the second direction and is connected to the side magnet; wherein the side magnet and the common magnet are integrally formed.

[0027] In one embodiment, the magnetic circuit system further includes a magnetic guide plate assembly, which includes a central magnetic guide plate, side magnetic guide plates, and a common magnetic guide plate. The central magnetic guide plate is disposed on the side of the central magnet facing away from the magnetic guide yoke, the side magnetic guide plates are disposed on the side of the side magnet facing away from the magnetic guide yoke, and the common magnetic guide plate is disposed on the side of the common magnet facing away from the magnetic guide yoke.

[0028] Wherein, the side magnetic plates form a closed integral ring structure; or, the side magnetic plates include multiple ones, and adjacent side magnetic plates are connected end to end to form a closed ring structure; or, the side magnetic plates include multiple ones, and the multiple side magnetic plates are spaced apart to form a second gap between adjacent side magnetic plates.

[0029] And / or, the side magnetic plate is square, and sound-permeable holes are provided at the four corners of the side magnetic plate;

[0030] And / or, the side magnetic plate is provided with a groove on the side facing away from the side magnet, the groove being used to avoid the lead portion of the voice coil;

[0031] And / or, the common magnetic conductive plate extends along a third direction perpendicular to the second direction and is connected to the side magnetic conductive plate; wherein, the side magnetic conductive plate and the common magnetic conductive plate are integrally formed.

[0032] In one embodiment, the sound-generating device further includes a vibration system that vibrates along a first direction. The vibration system includes a diaphragm assembly and a voice coil connected to the diaphragm assembly. The diaphragm assembly is disposed opposite to and spaced apart from the magnetic circuit system, and the voice coil is disposed corresponding to the magnetic gap.

[0033] The diaphragm assembly has a conductive layer, the voice coil has a lead portion, one end of the conductive layer is electrically connected to an external circuit, and the other end of the conductive layer is connected to the lead portion.

[0034] In one embodiment, the diaphragm assembly includes a diaphragm and a dome. The diaphragm includes an inner ring portion, a folded ring portion surrounding the inner ring portion, and a fixing portion surrounding the folded ring portion. The inner ring portion forms a hollow hole, and the dome is connected to the inner ring portion and covers the hollow hole. The diaphragm is provided with the conductive layer, and the voice coil is connected to the dome.

[0035] In one embodiment, the conductive layer extends from the inner ring portion to the fixing portion, the periphery of the dome is connected to the side of the inner ring portion facing the magnetic circuit system, the dome is provided with a through hole corresponding to the conductive layer, and the lead portion passes through the through hole and connects to the conductive layer;

[0036] And / or, the dome is provided with a protrusion extending toward the magnetic circuit system, the protrusion being connected to the voice coil;

[0037] And / or, the sound-generating device further includes a housing, the outer periphery of the diaphragm assembly is connected to one end of the housing, and the magnetic circuit system is connected to the other end of the housing; wherein, the housing is provided with a conductive element, and the conductive layer is connected and conductive to the conductive element.

[0038] In one embodiment, the magnetic circuit system is provided with a plurality of magnetic gaps, which are spaced apart along a second direction, the second direction being perpendicular to the first direction;

[0039] The voice coils include a plurality of voice coils, each of which is connected to the diaphragm assembly and is arranged at intervals along the second direction. Each voice coil is correspondingly provided with a magnetic gap.

[0040] The multiple voice coils are connected in series.

[0041] This utility model also proposes an electronic device, which includes the sound-generating device described above.

[0042] The sound-generating device of this utility model comprises a magnetic circuit system consisting of a magnetic yoke and a magnet assembly connected to the magnetic yoke. The magnetic yoke has a receiving space, and the magnet assembly consists of a main body located on the first side of the magnetic yoke and a protrusion extending into the receiving space of the magnetic yoke. Furthermore, by using neodymium iron boron (NdFeB) material for the magnet assembly, the magnet assembly and the magnetic yoke are integrally hot-pressed, allowing the outer periphery of the protrusion of the magnet assembly to fit snugly against the inner wall of the receiving space of the magnetic yoke. This achieves a "zero-fit" connection between the magnet assembly and the magnetic yoke, maximizing the volume of the magnet assembly. Compared to sintered NdFeB, hot-pressed NdFeB improves the mechanical strength of the magnet assembly and makes it less prone to breakage. This allows the sound-generating device to achieve an ultra-thin magnetic circuit design while increasing the magnet volume of the magnetic circuit system, thereby improving the sound-generating performance of the device. It also ensures good structural reliability of the magnetic circuit system, making it less prone to breakage and improving the stability of the product in use. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0044] Figure 1 A schematic diagram of the structure of an embodiment of the sound-generating device provided by this utility model;

[0045] Figure 2 A cross-sectional schematic diagram of an embodiment of the sound-generating device provided by this utility model;

[0046] Figure 3 An exploded view of an embodiment of the sound-generating device provided by this utility model;

[0047] Figure 4 A schematic diagram of another embodiment of the sound-generating device provided by this utility model;

[0048] Figure 5 A cross-sectional schematic diagram of another embodiment of the sound-generating device provided by this utility model;

[0049] Figure 6 An exploded view of another embodiment of the sound-generating device provided by this utility model;

[0050] Figure 7 A schematic diagram of another embodiment of the vibration system provided by this utility model;

[0051] Figure 8 This is a schematic diagram of another embodiment of the diaphragm provided by this utility model.

[0052] Explanation of icon numbers:

[0053] 100. Sound-generating device; 1. Housing; 11. Conductive component; 2. Magnetic circuit system; 21. Magnetic yoke; 211. Receiving space; 214. First yoke plate; 215. Recessed groove; 216. Second yoke plate; 22. Magnet assembly; 221. Central magnet; 2211. Main body; 2212. Protrusion; 222. Side magnet; 223. Common magnet; 23. Magnetic plate assembly; 231. Central magnetic plate; 232. Side Magnetic guide plate; 2321, groove; 2322, sound-permeable hole; 233, shared magnetic guide plate; 24, magnetic gap; 3, vibration system; 31, diaphragm assembly; 311, diaphragm; 3111, inner ring; 3112, folded ring; 3113, fixing part; 3114, conductive layer; 3115, hollow hole; 312, dome; 3121, through hole; 3122, protrusion; 32, voice coil; 321, lead wire part; 4, mesh cloth.

[0054] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0055] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0056] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0057] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0058] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0059] This utility model proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applied to electronic devices, such as mobile phones, headphones, smart wearable devices, tablet computers, laptops, etc., and is not limited thereto.

[0060] Please refer to the reference. Figures 1 to 8 As shown, in this embodiment of the present invention, the sound-generating device 100 includes a magnetic circuit system 2, the magnetic circuit system 2 having a magnetic gap 24, the magnetic circuit system 2 including a magnetic yoke 21 and a magnet assembly 22 connected to the magnetic yoke 21, the magnet assembly 22 being made of neodymium iron boron material and integrally hot-pressed with the magnetic yoke 21; wherein, the magnetic yoke 21 is provided with a receiving space 211, the magnetic yoke 21 having a first side and a second side disposed opposite to each other, the magnet assembly 22 including a main body 2211 disposed on the first side and a protrusion 2212 extending into the receiving space 211, the outer periphery of the protrusion 2212 being fitted to the inner wall of the receiving space 211.

[0061] 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 sound-generating device 100 also includes a vibration system 3, and the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 are arranged opposite to each other.

[0062] To better assemble the magnetic circuit system 2 and vibration system 3 of the sound-generating device 100, in one embodiment, as... Figures 1 to 6 As shown, the sound-generating device 100 also includes a housing 1, a magnetic circuit system 2 connected to one end of the housing 1, and a vibration system 3 connected to the other end of the housing 1 and arranged opposite to the magnetic circuit system 2.

[0063] It should be noted that the outer shell 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 shell 1 provides a mounting base for components such as the magnetic circuit system 2 and the vibration system 3. It is understood that the outer shell 1 can be a single integral structure or formed by the cooperation of multiple separate structures; no limitation is made here. In this embodiment, the outer shell 1 can be a square frame or a frame structure, that is, the outer shell 1 has a cavity with openings at both ends. The magnetic circuit system 2 and the vibration system 3 are respectively connected to the two sides of the outer shell 1 and are arranged opposite to each other, so that the diaphragm 311 of the magnetic circuit system 2, the outer shell 1, and the vibration system 3 encloses and forms a vibration cavity.

[0064] Understandably, the sound-generating device 100 is used in electronic devices, meaning that the sound-generating device 100 can be installed in the electronic device through the housing 1. It should be noted that the housing 1 of the sound-generating device 100 can be a separate housing or enclosure structure from the electronic device. In this case, the housing 1 integrates the magnetic circuit system 2 and vibration system 3 of the sound-generating device 100 into a single structure, facilitating assembly and disassembly. Alternatively, the housing 1 of the sound-generating device 100 can be integrally molded with the housing or enclosure structure of the electronic device, which effectively improves structural strength and sealing performance.

[0065] In this embodiment, the outer shell 1 is used to house the fixed vibration system 3 and magnetic circuit system 2, etc., 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. Of course, in other embodiments, the sound generating device 100 can also be a module structure, in which case the vibration system 3 and magnetic circuit system 2 of the sound generating unit are installed as multiple independent components on the housing of the module structure, which is not limited here.

[0066] Optionally, the sound-generating device 100 is rectangular in shape. In this embodiment, the housing 1 of the sound-generating device 100 is optionally rectangular in shape. Figure 1 , Figure 3 , Figure 4 , Figure 6As shown, the outer shell 1 has two first sides and two second sides connected end to end. The two first sides and two second sides enclose a rectangular frame structure. The connection between the first side and the second side forms a corner, which is the corner position of the outer shell 1.

[0067] It should be noted that, as Figures 1 to 7 As shown, in a specific example, the vibration direction of the vibration system 3 of the sound-generating device 100 is a first direction (i.e., the height direction of the outer shell 1), the short side direction of the sound-generating device 100 (i.e., the extension direction of the first side of the outer shell 1) is a second direction, and the long side direction of the sound-generating device 100 (i.e., the extension direction of the second side of the outer shell 1) is a third direction. In this case, the first, second, and third directions are mutually perpendicular. In this embodiment, the first direction is the thickness direction or the Z-direction of the sound-generating device 100, and the vibration system 3 vibrates along the first direction (e.g., the vertical direction). Of course, in other embodiments, the long side direction of the sound-generating device 100 can be the second direction, and the short side direction of the sound-generating device 100 can be the third direction; this is not limited here.

[0068] In this embodiment, the vibration system 3 includes a diaphragm assembly 31 and a voice coil 32 connected to the diaphragm assembly 31. The magnetic circuit system 2 is provided with a magnetic gap 24. The periphery of the diaphragm assembly 31 is connected to the outer shell 1, and the voice coil 32 is correspondingly arranged with the magnetic gap 24. It can be understood that when an electric current is passed through the voice coil 32, the voice coil 32 converts electrical energy into mechanical energy within the magnetic gap 24 formed by the magnetic circuit system 2, thereby driving the voice coil 32 to vibrate the diaphragm assembly 31, thus achieving sound production.

[0069] It should be noted that, as an important electroacoustic transducer in consumer electronics products, the sound-generating device 100 has also become thinner due to the trend towards thinner and lighter overall devices. In related technologies, the reduction in the thickness of the speaker's outer surface necessitates a simultaneous reduction in the thickness of internal components, such as magnets, magnetic plates, and yokes. In particular, the thinning of the magnets greatly increases the risk. Miniature speakers typically use sintered neodymium iron boron magnets, which have high performance, but they are brittle and prone to breakage after thinning, resulting in significant yield losses and low mass production feasibility.

[0070] Understandably, compared to normal assembly where there are assembly tolerances and material tolerances, especially at some R-corner positions, the tolerances are generally larger. The sound-generating device 100 of this utility model sets the magnetic circuit system 2 as a magnetic yoke 21 and a magnet assembly 22 connected to the magnetic yoke 21. The magnetic yoke 21 has a receiving space 211, and the magnet assembly 22 is set as a main body 2211 located on the first side of the magnetic yoke 21 and a protrusion 2212 extending into the receiving space 211 of the magnetic yoke 21. Furthermore, by using neodymium iron boron material for the magnet assembly 22, the magnet assembly 22 and the magnetic yoke 21 are integrally thermo-pressed, thus ensuring that the outer periphery of the protrusion 2212 of the magnet assembly 22 fits snugly against the inner wall of the receiving space 211 of the magnetic yoke 21, that is, the magnet assembly 22 and the magnetic yoke 21 are effectively bonded together. The "zero-fit" design allows for a near-perfect fit between the magnet assembly 22 and the magnetic yoke 21, eliminating assembly and material tolerances. This maximizes the volume of the magnet assembly 22. Furthermore, compared to sintered NdFeB, hot-pressed NdFeB improves the mechanical strength of the magnet assembly 22 and makes it less prone to breakage. This allows the sound-generating device 100 to achieve an ultra-thin magnetic circuit design while increasing the magnet volume of the magnetic circuit system 2, thereby enhancing the sound-generating performance of the sound-generating device 100. It also ensures the structural reliability of the magnetic circuit system 2, making it less prone to breakage. This not only improves the stability of the product but also meets higher performance requirements, compensating for the performance loss caused by the thinner and lighter design of the sound-generating device 100.

[0071] It should be noted that the receiving space 211 of the magnetic yoke 21 can be a groove structure or a through-hole structure, and is not limited here. Optionally, the receiving space 211 is a groove structure provided on the first side. In this embodiment, as... Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the accommodating space 211 is a through-hole structure that connects the first side and the second side.

[0072] In one embodiment, the receiving space 211 extends through the first side and the second side, and the side of the protrusion 2212 facing away from the main body 2211 is flush with the second side. It is understood that... Figure 2 and Figure 5 As shown, by aligning the second side of the magnetic yoke 21 with the side of the protrusion 2212 of the magnet assembly 22 facing away from the main body 2211, the mating structure between the magnet assembly 22 and the magnetic yoke 21 becomes more compact.

[0073] In one embodiment, the magnet assembly 22 includes a central magnet 221 and a side magnet 222. The side magnet 222 is located outside the central magnet 221 and is spaced apart from the central magnet 221 to form a magnetic gap 24. Both the central magnet 221 and the side magnet 222 are made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke 21. The central magnet 221 includes a main body 2211 and a protrusion 2212.

[0074] In this embodiment, as Figures 1 to 3 As shown, by configuring the magnet assembly 22 with a central magnet 221 and a side magnet 222, the side magnet 222 is located outside the central magnet 221, and the side magnet 222 and the central magnet 221 are spaced apart to form a magnetic gap 24. Optionally, the sound generating device 100 has a single voice coil structure, that is, the vibration system 3 includes only one voice coil 32, one end of the voice coil 32 is connected to the diaphragm assembly 31, and the other end of the voice coil 32 is correspondingly arranged with the magnetic gap 24.

[0075] Understandably, by using neodymium iron boron material for both the central magnet 221 and the side magnet 222 of the magnet assembly 22, and hot-pressing them integrally with the magnetic yoke 21, the central magnet 221 and the side magnet 222 can achieve "zero fit" with the magnetic yoke 21. That is, the connection between the central magnet 221 and the side magnet 222 and the magnetic yoke 21 is almost completely fitted, eliminating assembly tolerances and material tolerances. This increases the volume of the central magnet 221 and the side magnet 222, improves the performance of the sound-generating device 100, and the central magnet 221 and the side magnet 222 are not easy to break due to the good structural reliability of the hot-pressed neodymium iron boron magnet.

[0076] In this embodiment, as Figure 2 As shown, the central magnet 221 includes a main body 2211 and a protrusion 2212. The main body 2211 of the central magnet 221 is connected to the first side of the magnetic yoke 21, and the protrusion 2212 of the central magnet 221 extends into the receiving space 211 of the magnetic yoke 21, such that the outer periphery of the protrusion 2212 is flush with the inner wall of the receiving space 211 of the magnetic yoke 21. Optionally, the side of the protrusion 2212 away from the main body 2211 is flush with the second side of the magnetic yoke 21. Of course, in other embodiments, the side magnet 222 includes a main body 2211 and a protrusion 2212, which is not limited here.

[0077] In one implementation, such as Figures 1 to 8 As shown, the sound-generating device 100 also includes a vibration system 3 disposed opposite to the magnetic circuit system 2. The vibration system 3 includes a diaphragm assembly 31 and a voice coil 32. One end of the voice coil 32 is connected to the diaphragm assembly 31, and the other end of the voice coil 32 is disposed corresponding to the magnetic gap 24. The magnetic circuit system 2 drives the voice coil 32 to reciprocate along the first direction.

[0078] In this embodiment, along the first direction, the magnetic yoke 21 has a first yoke plate 214 disposed opposite to the magnetic gap 24. Optionally, the outer peripheral wall of the first yoke plate 214 is respectively fitted to the side walls of the central magnet 221 and the side magnet 222, so that the first yoke plate 214 is "zero-fitted" with the central magnet 221 and the side magnet 222.

[0079] Understandable, such as Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the first yoke 214 has a first dimension L1 along the second direction and a second dimension L2 along the third direction, wherein the first dimension L1 is smaller than the second dimension L2.

[0080] In this embodiment, the thickness of the voice coil 32 is defined as D. The thickness D of the voice coil 32 and the first dimension L1 of the first yoke 214 satisfy the condition: 0.1 ≤ D / L1 < 1. It should be noted that the size of the first dimension L1 of the first yoke 214 affects the magnetic focusing effect and magnetic permeability of the first yoke 214. When L1 is too small, the magnetic focusing effect and magnetic permeability of the first yoke 214 are limited, thereby affecting the magnetic field strength acting on the voice coil 32. When L1 is too large, although the magnetic focusing effect and magnetic permeability can be satisfied, it will increase the weight of the magnetic circuit system 2 and reduce the installation volume of the magnet assembly 22, thereby affecting the B value of the magnetic circuit system 2 and the sound production performance of the sound generating device 100. When 0.1 ≤ D / L1 < 1, the design requirements of the magnetic focusing effect and magnetic permeability of the first yoke 214, as well as the thinness and high acoustic performance of the sound generating device 100 can be balanced.

[0081] In this embodiment, the ratio of the thickness D of the voice coil 32 to the first dimension L1 of the first yoke 214 can be selected as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc., and is not limited here. Optionally, the first dimension L1 of the first yoke 214 is at least greater than the width of the magnetic gap 24 (that is, the distance between the center magnet 221 and the side magnet 222).

[0082] In one embodiment, the first yoke 214 has a maximum dimension H1 along the first direction, and the magnet assembly 22 has a maximum dimension H2 along the first direction. The maximum dimensions H2 and H1 satisfy: 2≤H2 / H1≤10.

[0083] Understandably, if the maximum dimension H1 of the first yoke 214 is too small, it will affect the magnetic focusing effect and magnetic conductivity of the first yoke 214; while if the maximum dimension H1 of the first yoke 214 is too large, it will increase the weight of the magnetic circuit system 2, failing to meet the requirements of the lightweight design of the sound-generating device 100. Moreover, under the condition of the same product height, if the maximum dimension H1 of the first yoke 214 is too large, it will cause the maximum dimension H2 of the magnet assembly 22 to become smaller, thereby reducing the volume of the magnet assembly 22, reducing the magnetic field strength of the magnetic circuit system 2, and lowering the product BL value of the sound-generating device 100, thus affecting the acoustic performance of the sound-generating device 100.

[0084] In this embodiment, by setting the ratio of the maximum size H2 of the magnet assembly 22 to the maximum size H1 of the first yoke 214 within the range of 2 to 10, not only does the first yoke 214 meet the magnetic focusing effect and magnetic conductivity required by the sound-generating device 100, but it also ensures that the volume of the magnet assembly 22 meets the usage requirements, that is, that the magnetic field strength generated by the magnet assembly 22 meets the usage requirements of the voice coil 32. Optionally, the ratio of the maximum size H2 of the magnet assembly 22 to the maximum size H1 of the first yoke 214 can be selected as 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., and is not limited here.

[0085] In one embodiment, the first yoke 214 has a recessed groove 215 extending in a first direction corresponding to the magnetic gap 24. The recessed groove 215 is used to avoid the voice coil 32. It is understood that... Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, by providing a recessed groove 215 on the first yoke plate 214, interference between the voice coil 32 and the first yoke plate 214 in the vibration direction can be prevented, thereby providing more space for the vibration of the voice coil 32 using the recessed groove 215.

[0086] Optionally, the side magnets 222 form a closed, integrated ring structure and are arranged around the central magnet 221. It is understood that by setting the side magnets 222 as an integrated ring structure, allowing them to surround the central magnet 221, the magnet volume of the magnet assembly 22 in the magnetic circuit system 2 is effectively increased to improve the BL value, thereby significantly improving the overall performance and sound volume, while also simplifying the processing and assembly steps. Alternatively, multiple side magnets 222 may be included, with adjacent side magnets 222 connected end-to-end to form a closed ring structure and surrounding the central magnet 221. It is understood that by setting multiple side magnets 222 as a closed ring structure connected end-to-end, the magnet volume of the magnet assembly 22 in the magnetic circuit system 2 is effectively increased to improve the BL value, thereby significantly improving the overall performance and sound volume. Alternatively, multiple side magnets 222 may be included, with the multiple side magnets 222 spaced apart and arranged around the central magnet 221, so that a first gap is formed between adjacent side magnets 222. Understandably, by arranging multiple side magnets 222 at intervals, a first gap is formed between adjacent side magnets 222. This allows for the use of the first gap to provide space for the installation and clearance of the centering support when the sound-generating device 100 is equipped with structures such as a centering support.

[0087] In one embodiment, the magnetic circuit system 2 further includes a magnetic guide plate assembly 23, which includes a central magnetic guide plate 231 and a side magnetic guide plate 232. The central magnetic guide plate 231 is disposed on the side of the central magnet 221 facing away from the magnetic guide yoke 21, and the side magnetic guide plate 232 is disposed on the side of the side magnet 222 facing away from the magnetic guide yoke 21.

[0088] In this embodiment, as Figure 2 and Figure 3 As shown, by setting the magnetic guide plate assembly 23, the central magnetic guide plate 231 and the side magnetic guide plate 232 of the magnetic guide plate assembly 23 are respectively set to correspond to the central magnet 221 and the side magnet 222. In this way, the central magnetic guide plate 231 and the side magnetic guide plate 232 can respectively concentrate and guide the central magnet 221 and the side magnet 222, so that the magnetic circuit system 2 forms a magnetic loop, and the magnetic field lines formed by the magnetic field can be concentrated and pass through the voice coil 32 in the magnetic gap 24.

[0089] Understandably, the outer contour of the central magnetic plate 231 is consistent with the outer contour of the central magnet 221, and the outer contour of the side magnetic plate 232 is consistent with the outer contour of the side magnet 222. Optionally, both the central magnetic plate 231 and the central magnet 221 have a plate-like structure.

[0090] Optionally, the side magnetic plate 232 forms a closed, integral ring structure. It is understood that the side magnetic plate 232 is an integrally formed ring structure. In this case, the side magnet 222 can be an integral ring structure, a closed ring structure formed by multiple side magnets 222, or multiple side magnets 222 spaced apart, etc., and there is no limitation here.

[0091] Alternatively, the side magnetic plates 232 may comprise multiple plates, with adjacent plates 232 connected end-to-end to form a closed ring structure. It is understood that when multiple side magnetic plates 232 form a closed ring structure, the side magnets 222 can be an integral ring structure, a closed ring structure formed by multiple side magnets 222, or multiple side magnets 222 spaced apart, etc., and are not limited here.

[0092] Alternatively, multiple side magnetic plates 232 may be included, and these multiple side magnetic plates 232 may be spaced apart to form a second gap between adjacent side magnetic plates 232. It is understood that when multiple side magnetic plates 232 are spaced apart, the side magnet 222 may be an integral ring structure, a closed ring structure formed by multiple side magnets 222, or multiple side magnets 222 spaced apart, etc., and no limitation is made here.

[0093] Optionally, the side magnetic plate 232 and the side magnet 222 are set in a one-to-one correspondence, which is not limited here.

[0094] In one embodiment, the side magnetic plate 232 is square, and sound-permeable holes 2322 are provided at the four corners of the side magnetic plate 232.

[0095] In this embodiment, as Figure 3 and Figure 6 As shown, by setting the side magnetic plate 232 into a square ring structure, the side magnetic plate 232 corresponds to the side magnet 222. It can be understood that by providing sound-permeable holes 2322 at the four corners of the side magnetic plate 232, the air pressure in the vibration cavity or rear cavity can be rapidly circulated when the diaphragm assembly 31 vibrates, thereby achieving air pressure balance and making the sound output of the sound-generating device 100 smoother.

[0096] Understandably, the side magnet 222 has a clearance structure corresponding to the sound-transmitting hole 2322 of the side magnetic guide plate 232. In this embodiment, the sound-generating device 100 also includes a housing 1, the outer periphery of the diaphragm assembly 31 of the vibration system 3 is connected to the housing 1, and the magnetic circuit system 2 is connected to the housing 1 through the side magnetic guide plate 232. Optionally, the side magnetic guide plate 232 and the housing 1 are integrally formed, which is not limited here.

[0097] In one embodiment, the side magnetic plate 232 has a groove 2321 extending in a first direction on the side facing away from the side magnet 222. The groove 2321 is used to avoid the lead portion 321 of the voice coil 32.

[0098] In this embodiment, as Figure 3 As shown, by providing a groove 2321 on the side magnetic plate 232, such that the groove 2321 is located on the side of the side magnetic plate 232 facing away from the side magnet 222 and extends along the first direction, the groove 2321 can provide clearance for the lead portion 321 of the voice coil 32 when the voice coil 32 vibrates. Optionally, the groove 2321 is provided at the four corner positions of the side magnetic plate 232.

[0099] In one embodiment, the magnet assembly 22 includes a central magnet 221, a side magnet 222, and a common magnet 223. The side magnet 222 is located outside the central magnet 221 and the common magnet 223, and the central magnet 221 and the common magnet 223 are arranged at intervals along a second direction.

[0100] In this embodiment, as Figures 4 to 6 As shown, the central magnet 221 includes at least two, and the shared magnet 223 includes at least one. Each shared magnet 223 is located between two adjacent central magnets 221 and is spaced apart from the central magnets 221.

[0101] Understandably, when there are two central magnets 221 and one shared magnet 223, each central magnet 221 is spaced apart from the side magnets 222 and the shared magnet 223 to form a magnetic gap 24. When there are N central magnets 221 and N-1 shared magnets 223, where N > 2, the magnetic gap 24 includes a first magnetic gap and a second magnetic gap. The central magnet 221 is spaced apart from the side magnets 222 and the shared magnet 223 to form the first magnetic gap, and the central magnet 221 is spaced apart from two adjacent shared magnets 223 to form the second magnetic gap.

[0102] In this embodiment, the vibration system 3 of the sound-generating device 100 includes a plurality of voice coils 32, and each voice coil 32 is correspondingly disposed with a magnetic gap 24. Optionally, as Figures 4 to 8 As shown, when there are two central magnets 221 and one shared magnet 223, the magnetic circuit system 2 forms two magnetic gaps 24. At this time, the vibration system 3 includes two voice coils 32, each voice coil 32 is correspondingly set with a magnetic gap 24, and each voice coil 32 is arranged around a central magnet 221.

[0103] When the number of central magnets 221 is N and the number of shared magnets 223 is N-1, where N > 2, the two central magnets 221 on both sides are spaced apart with the side magnets 222 and the shared magnets 223 to form two first magnetic gaps, and the central magnet 221 in the middle is spaced apart with the two adjacent shared magnets 223 to form a second magnetic gap. Optionally, the number of central magnets 221 is at least 3, and the number of magnetic gaps 24 (i.e., the sum of the number of first magnetic gaps and the number of second magnetic gaps) is the same as the number of central magnets 221. In this embodiment, the number of voice coils 32 is the same as the number of magnetic gaps 24 and the number of central magnets 221, and is not limited here.

[0104] Understandably, when space is limited, the sound-generating device 100 adopts a multi-voice coil 32 structure, which can increase the total length of the voice coil 32, improve the L value of the voice coil 32, and set the magnetic circuit system 2 as multiple magnet components 22, thereby effectively increasing the magnet volume of the magnet components 22 in the magnetic circuit system 2 to improve the BL value, and thus significantly improve the sound-generating sensitivity and loudness of the sound-generating device 100, and improve the acoustic performance.

[0105] In this embodiment, the central magnet 221, the side magnets 222, and the common magnet 223 are all made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke 21. This allows the central magnet 221, side magnets 222, and common magnet 223 to achieve "zero-fit" with the magnetic yoke 21, meaning that the connection points of the central magnet 221, side magnets 222, and common magnet 223 with the magnetic yoke 21 are almost completely fitted, eliminating assembly tolerances and material tolerances. This increases the magnet volume of the magnet assembly 22 and improves the structural strength of the assembly structure of the central magnet 221, side magnets 222, and common magnet 223 with the magnetic yoke 21, making it less prone to breakage.

[0106] Optionally, both the central magnet 221 and the common magnet 223 include a main body 2211 and a protrusion 2212. In this embodiment, as... Figure 5 As shown, the magnetic yoke 21 is provided with receiving spaces 211 corresponding to the central magnet 221 and the common magnet 223 respectively. It can be understood that the number of receiving spaces 211 is the same as the number of protrusions 2212, and is not limited here.

[0107] In one embodiment, the central magnet 221 includes two, the common magnet 223 includes one, the two central magnets 221 are located on opposite sides of the common magnet 223, and the magnetic yoke 21 has a first yoke plate 214 and a second yoke plate 216 disposed opposite to the magnetic gap 24.

[0108] Understandable, such as Figures 5 to 7As shown, each central magnet 221, together with the side magnet 222 and the common magnet 223, forms a magnetic gap 24. The magnetic yoke 21 is provided with a first yoke plate 214 and a second yoke plate 216 corresponding to each magnetic gap 24. Optionally, each magnetic gap 24 has two long sides and two short sides connected end-to-end, and the first yoke plate 214 and the second yoke plate 216 of the magnetic yoke 21 are respectively provided corresponding to the two long sides or the two short sides of the magnetic gap 24; this is not limited here.

[0109] In this embodiment, as Figure 5 As shown, the outer peripheral wall of the first yoke 214 is respectively attached to the side walls of the central magnet 221 and the side magnet 222, and the outer peripheral wall of the second yoke 216 is respectively attached to the side walls of the central magnet 221 and the common magnet 223.

[0110] Optionally, the first yoke 214 and the second yoke 216 are provided with recessed grooves 215 for avoiding the voice coil 32 in the corresponding magnetic gap 24. It can be understood that the first yoke 214 and the second yoke 216 are both provided with recessed grooves 215 extending in the first direction, which can prevent the voice coil 32 from interfering with the first yoke 214 and the second yoke 216 in the vibration direction, thereby providing more space for the vibration of the voice coil 32 using the recessed grooves 215.

[0111] It should be noted that both the first yoke 214 and the second yoke 216 extend along a third direction, and are spaced apart along a second direction. In this embodiment, both the first yoke 214 and the second yoke 216 have a maximum dimension H1 along the first direction. Optionally, the maximum dimension H1 of the first yoke 214 along the first direction is the same as the maximum dimension H1 of the second yoke 216 along the first direction. It is understood that the maximum dimension H1 of the first yoke 214 and the second yoke 216 satisfies the condition 2 ≤ H2 / H1 ≤ 10 with respect to the maximum dimension H2 of the magnet assembly 22, which is not limited here.

[0112] It is understood that both the first yoke 214 and the second yoke 216 have a first dimension L1 along the second direction and a second dimension L2 along the third direction, wherein the first dimension L1 of the first yoke 214 and the second yoke 216 is smaller than the second dimension L2. Optionally, the first dimension L1 of the first yoke 214 is the same as the first dimension L1 of the second yoke 216, and the second dimension L2 of the first yoke 214 is the same as the second dimension L2 of the second yoke 216. In this embodiment, the first dimension L1 of the first yoke 214 and the second yoke 216 and the thickness D of the voice coil 32 satisfy: 0.1 ≤ D / L1 < 1, which is not limited here.

[0113] Optionally, the side magnet 222 forms a closed, integral ring structure and surrounds the central magnet 221 and the common magnet 223. This effectively increases the magnet volume of the side magnet 222, thereby increasing the magnetic field strength. At the same time, it simplifies the processing steps and assembly procedures of the side magnet 222.

[0114] Of course, in other embodiments, the side magnets 222 include multiple ones, with adjacent side magnets 222 connected end to end to form a closed ring structure, and arranged around the central magnet 221 and the common magnet 223. This can effectively increase the magnet volume of the side magnets 222, thereby increasing the magnetic field strength.

[0115] Alternatively, the side magnets 222 may include a plurality of side magnets 222 spaced apart and arranged around the central magnet 221 and the common magnet 223, such that a first gap is formed between adjacent side magnets 222. This arrangement allows for improved installation and clearance space for the centering support of the sound-generating device 100 by utilizing the first gap between adjacent side magnets 222.

[0116] In one implementation, such as Figure 6 As shown, the common magnet 223 extends along a third direction perpendicular to the second direction and is connected to the side magnet 222. It is understood that the common magnet 223 and the side magnet 222 can be welded or bonded together. Optionally, the side magnet 222 and the common magnet 223 are integrally formed. This arrangement not only simplifies the structural design of the magnetic circuit system 2, but also, since no glue gap needs to be maintained between the side magnet 222 and the common magnet 223, further increases the magnet volume, thereby improving the magnetic field strength.

[0117] In one embodiment, the magnetic circuit system 2 further includes a magnetic guide plate assembly 23, which includes a central magnetic guide plate 231, a side magnetic guide plate 232, and a common magnetic guide plate 233. The central magnetic guide plate 231 is disposed on the side of the central magnet 221 opposite to the magnetic guide yoke 21, the side magnetic guide plate 232 is disposed on the side of the side magnet 222 opposite to the magnetic guide yoke 21, and the common magnetic guide plate 233 is disposed on the side of the common magnet 223 opposite to the magnetic guide yoke 21.

[0118] In this embodiment, as Figure 5 and Figure 6 As shown, by setting the magnetic guide plate assembly 23, the central magnetic guide plate 231, the side magnetic guide plate 232, and the common magnetic guide plate 233 of the magnetic guide plate assembly 23 are respectively set to correspond to the central magnet 221, the side magnet 222, and the common magnet 223. In this way, the central magnetic guide plate 231, the side magnetic guide plate 232, and the common magnetic guide plate 233 can respectively concentrate and guide the magnetic field to the central magnet 221, the side magnet 222, and the common magnet 223, so that the magnetic circuit system 2 forms a magnetic loop, and the magnetic field lines formed by the magnetic field can be concentrated and pass through the voice coil 32 in the magnetic gap 24.

[0119] Understandably, the outer contour of the central magnetic plate 231 is consistent with the outer contour of the central magnet 221, the outer contour of the side magnetic plate 232 is consistent with the outer contour of the side magnet 222, and the outer contour of the common magnetic plate 233 is consistent with the outer contour of the common magnet 223. Optionally, both the central magnetic plate 231 and the central magnet 221 have a plate-like structure. Both the common magnetic plate 233 and the common magnet 223 have a plate-like structure.

[0120] In this embodiment, the central magnetic plate 231 and the central magnet 221 are arranged in a one-to-one correspondence, and the shared magnetic plate 233 and the shared magnet 223 are arranged in a one-to-one correspondence.

[0121] Optionally, the side magnetic plate 232 forms a closed, integral ring structure. It is understood that the side magnetic plate 232 is an integrally formed ring structure. In this case, the side magnet 222 can be an integral ring structure, a closed ring structure formed by multiple side magnets 222, or multiple side magnets 222 spaced apart, etc., and there is no limitation here.

[0122] Alternatively, the side magnetic plates 232 may comprise multiple plates, with adjacent plates 232 connected end-to-end to form a closed ring structure. It is understood that when multiple side magnetic plates 232 form a closed ring structure, the side magnets 222 can be an integral ring structure, a closed ring structure formed by multiple side magnets 222, or multiple side magnets 222 spaced apart, etc., and are not limited here.

[0123] Alternatively, multiple side magnetic plates 232 may be included, and these multiple side magnetic plates 232 may be spaced apart to form a second gap between adjacent side magnetic plates 232. It is understood that when multiple side magnetic plates 232 are spaced apart, the side magnet 222 may be an integral ring structure, a closed ring structure formed by multiple side magnets 222, or multiple side magnets 222 spaced apart, etc., and no limitation is made here.

[0124] Optionally, the side magnetic plate 232 and the side magnet 222 are set in a one-to-one correspondence, which is not limited here.

[0125] In one embodiment, the side magnetic plate 232 is square, and sound-permeable holes 2322 are provided at the four corners of the side magnetic plate 232.

[0126] In this embodiment, as Figure 6 As shown, by setting the side magnetic plate 232 into a square ring structure, the side magnetic plate 232 corresponds to the side magnet 222. It can be understood that by providing sound-permeable holes 2322 at the four corners of the side magnetic plate 232, the air pressure in the vibration cavity or rear cavity can be rapidly circulated when the diaphragm assembly 31 vibrates, thereby achieving air pressure balance and making the sound output of the sound-generating device 100 smoother.

[0127] Understandably, the side magnet 222 has a clearance structure corresponding to the sound-transmitting hole 2322 of the side magnetic guide plate 232. In this embodiment, the sound-generating device 100 also includes a housing 1, the outer periphery of the diaphragm assembly 31 of the vibration system 3 is connected to the housing 1, and the magnetic circuit system 2 is connected to the housing 1 through the side magnetic guide plate 232. Optionally, the side magnetic guide plate 232 and the housing 1 are integrally formed, which is not limited here.

[0128] In one embodiment, the side magnetic plate 232 has a groove 2321 on the side facing away from the side magnet 222. The groove 2321 is used to avoid the lead portion 321 of the voice coil 32.

[0129] In this embodiment, by providing a groove 2321 on the side magnetic plate 232, such that the groove 2321 is located on the side of the side magnetic plate 232 facing away from the side magnet 222 and extends along the first direction, the groove 2321 can provide clearance for the lead portion 321 of the voice coil 32 when the voice coil 32 vibrates. Optionally, the groove 2321 is provided at the four corner positions of the side magnetic plate 232.

[0130] In one embodiment, the common magnetic conductive plate 233 extends along a third direction perpendicular to the second direction and is connected to the side magnetic conductive plate 232. It is understood that the common magnetic conductive plate 233 and the side magnetic conductive plate 232 can be welded or bonded together. Optionally, the side magnetic conductive plate 232 and the common magnetic conductive plate 233 are integrally formed. This arrangement can improve the structural strength of the magnetic circuit system 2 and further increase the magnetic field strength.

[0131] In one embodiment, the sound-generating device 100 further includes a vibration system 3 that vibrates along a first direction. The vibration system 3 includes a diaphragm assembly 31 and a voice coil 32 connected to the diaphragm assembly 31. The diaphragm assembly 31 is positioned opposite and spaced apart from the magnetic circuit system 2, and the voice coil 32 is correspondingly positioned with respect to the magnetic gap 24. In this embodiment, as... Figures 1 to 8 As shown, the sound-generating device 100 can be a single voice coil structure or a multi-voice coil structure, and the number of voice coils 32 in the vibration system 3 is the same as the number of magnetic gaps 24 in the magnetic circuit system 2.

[0132] In order to enable the voice coil 32 to be connected to the external circuit, in one embodiment, the diaphragm assembly 31 is provided with a conductive layer 3114, the voice coil 32 has a lead portion 321, one end of the conductive layer 3114 is electrically connected to the external circuit, and the other end of the conductive layer 3114 is connected to the lead portion 321.

[0133] In this embodiment, as Figure 7 and Figure 8As shown, the conductive layer 3114 can be a conductive coating applied to the diaphragm assembly 31; or, the conductive layer 3114 can be conductive adhesive or a metal conductive layer adhered to the diaphragm assembly 31, etc., without limitation. It is understood that by providing the conductive layer 3114 on the diaphragm assembly 31, and electrically connecting the lead portion 321 of the voice coil 32 to the external circuit through the conductive layer 3114, the space occupied by the centering support can be saved, thereby increasing the magnet volume in the magnetic circuit system 2 and improving the product BL value of the sound-generating device 100.

[0134] In one embodiment, the diaphragm assembly 31 includes a diaphragm 311 and a dome 312. The diaphragm 311 includes an inner ring portion 3111, a folded ring portion 3112 surrounding the inner ring portion 3111, and a fixing portion 3113 surrounding the folded ring portion 3112. The inner ring portion 3111 forms a hollow hole 3115. The dome 312 is connected to the inner ring portion 3111 and covers the hollow hole 3115. The diaphragm 311 is provided with a conductive layer 3114, and the voice coil 32 is connected to the dome 312.

[0135] In this embodiment, as Figure 7 and Figure 8 As shown, the diaphragm 311 includes an inner ring portion 3111, a folded ring portion 3112, and a fixing portion 3113 connected sequentially from the inside to the outside. The inner ring portion 3111 is connected to the dome 312, the fixing portion 3113 is connected to the outer shell 1, and two voice coils 32 are connected to the dome 312. Optionally, the inner ring portion 3111 forms a perforated hole 3115, and the dome 312 is connected to the inner ring portion 3111 and covers the perforated hole 3115. This can reduce the weight of the diaphragm assembly 31.

[0136] It should be noted that the diaphragm 311 and the dome 312 of the diaphragm assembly 31 can be integrally formed structural components, such as integral injection molding or integral machining, etc., which is not limited here. Of course, in other embodiments, the diaphragm 311 and the dome 312 of the diaphragm assembly 31 can be separate structures. In this case, the dome 312 and the inner ring 3111 of the diaphragm 311 can be connected by adhesive bonding, which is not limited here.

[0137] To further improve the connection stability and waterproof sealing between the diaphragm 311 and the outer shell 1, the outer periphery of the diaphragm 311 is bent and extended toward the outer shell 1 to form a bent portion, which is connected to the outer wall of the outer shell 1. In this embodiment, the end of the fixing portion 3113 away from the folded ring portion 3112 is bent and extended toward the outer shell 1 to form a bent portion, which is connected to the outer wall of the outer shell 1. That is, the bent portion is formed by the outer periphery of the fixing portion 3113 of the diaphragm 311 bending and extending toward the outer shell 1. Optionally, the inner ring portion 3111, the folded ring portion 3112, the fixing portion 3113, and the bent portion of the diaphragm 311 are integrally formed structures.

[0138] In one embodiment, the conductive layer 3114 extends from the inner ring portion 3111 to the fixing portion 3113, the periphery of the dome 312 is connected to the side of the inner ring portion 3111 facing the magnetic circuit system 2, the dome 312 is provided with a through hole 3121 corresponding to the conductive layer 3114, and the lead portion 321 passes through the through hole 3121 and connects to the conductive layer 3114.

[0139] In this embodiment, as Figure 7 and Figure 8 As shown, by extending the conductive layer 3114 from the inner ring portion 3111 to the fixing portion 3113, and providing a through hole 3121 on the dome 312, it is convenient for the lead portion 321 to pass through the through hole 3121 and connect to the conductive layer 3114 when the voice coil 32 is connected to the dome 312.

[0140] To adjust the position of the voice coil 32 within the magnetic gap 24, in one embodiment, the dome 312 is provided with a protrusion 3122 extending toward the magnetic circuit system 2, and the protrusion 3122 is connected to the voice coil 32. This allows one end of the voice coil 32 to be connected to the protrusion 3122, while the other end of the voice coil 32 is suspended within the magnetic gap 24. Thus, the protrusion 3122 of the dome 312 can be used to position the voice coil 32 appropriately within the magnetic gap 24, ensuring that more magnetic field lines within the magnetic gap 24 pass through the voice coil 32.

[0141] In one embodiment, the sound-generating device 100 further includes a housing 1, the outer periphery of the diaphragm assembly 31 is connected to one end of the housing 1, and the magnetic circuit system 2 is connected to the other end of the housing 1; wherein, the housing 1 is provided with a conductive element 11, and the conductive layer 3114 is connected and conductive to the conductive element 11.

[0142] In this embodiment, as Figure 3 and Figure 6 As shown, by providing a conductive element 11 on the outer casing 1, when the fixing part 3113 of the diaphragm 311 is connected to the outer casing 1, the conductive layer 3114 located on the fixing part 3113 is connected and conductive to the conductive element 11.

[0143] In one embodiment, the magnetic circuit system 2 is provided with a plurality of magnetic gaps 24, which are spaced apart along a second direction, the second direction being perpendicular to the first direction; the voice coil 32 includes a plurality of voice coils 32, each of which is connected to the diaphragm assembly 31 and is spaced apart along the second direction, with each voice coil 32 corresponding to a magnetic gap 24.

[0144] Understandable, such as Figures 4 to 7 As shown, by setting multiple voice coils 32 and increasing the total length of the voice coils 32, the product BL value of the sound-generating device 100 can be increased, thereby significantly improving the sound-generating sensitivity and loudness of the sound-generating device 100 and enhancing the sound-generating effect.

[0145] It should be noted that, in order to further increase the total length of the voice coil 32, the number of voice coils 32 can be set to ≥2. Based on this, a ring-shaped magnetic circuit can be further designed to increase the magnet volume of the magnetic circuit system 2, thereby improving the BL value. Understandably, the number of voice coils 32 is consistent with the number of central magnets 221. When the number of voice coils 32 is N, and N≥2, the number of central magnets 221 is N, and the number of shared magnets 223 is N-1.

[0146] Understandably, multiple voice coils 32 can be connected in series or in parallel. It should be noted that multiple voice coils 32 can be connected to an external circuit through a centering support, conductive connector, or other means. Multiple voice coils 32 can be connected in series or in parallel through wires or conductive supports, etc., and this is not limited here. Optionally, multiple voice coils 32 can be connected in series. This allows multiple voice coils 32 to be wound using the same voice coil wire simultaneously, thus achieving a series connection, and this is not limited here either.

[0147] In one implementation, such as Figures 1 to 6 As shown, the sound-generating device 100 also includes a mesh 4, which is connected to the side of the magnetic circuit system 2 facing away from the vibration system 3. It is understood that the magnetic circuit system 2 and / or the housing 1 are provided with vent holes communicating with the vibration cavity or rear cavity. The mesh 4 covers the vent holes, so that when the sound-generating device 100 is installed in the module housing or box, the mesh 4 can be used to prevent sound-absorbing particles and other structures from entering the vibration cavity of the sound-generating device 100 through the vent holes.

[0148] This utility model also proposes an electronic device, which includes 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.

[0149] In one embodiment, the electronic device further includes a device housing and a flexible circuit board. The sound-generating device 100 is disposed inside the device housing. One end of the flexible circuit board is electrically connected to the sound-generating device 100, and the other end of the flexible circuit board is used to connect to an external power source.

[0150] Understandably, the flexible circuit board is used to connect and conduct external circuitry to the sound-generating device 100. The flexible circuit board has inner and outer pads; the inner pads of the flexible circuit board are connected and conduction-conducting with the sound-generating device 100, and the outer pads of the flexible circuit board are used to connect with external terminals.

[0151] In this embodiment, the device housing has a cavity, the sound-generating device 100 is disposed within the cavity of the device housing, and at least one end of the flexible circuit board connected to the sound-generating device 100 is located within the cavity of the device housing. Of course, in other embodiments, the flexible circuit board may also be entirely disposed within the cavity of the device housing, and this is not limited here.

[0152] Understandably, electronic devices can be headphones, mobile phones, computers, tablets, smart wearable devices, etc., and are not limited here. In an electronic device, the sound-generating device 100 can be assembled into the casing of the electronic device as a module or as a single unit. This electronic device can be a mobile phone, MP3 player, MP4 player, tablet, laptop, headphones, wearable devices, etc., and will not be listed here individually.

[0153] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes a magnetic circuit system with a magnetic gap. The magnetic circuit system includes a magnetic yoke and a magnet assembly connected to the magnetic yoke. The magnet assembly is made of neodymium iron boron material and is integrally hot-pressed with the magnetic yoke. The magnetic yoke has a receiving space and has a first side and a second side that are opposite to each other. The magnet assembly includes a main body part disposed on the first side and a protrusion part extending into the receiving space. The outer periphery of the protrusion part is fitted to the inner wall of the receiving space.

2. The sound-generating device as described in claim 1, characterized in that, The accommodating space is a groove structure provided on the first side; Alternatively, the accommodating space may be a through-hole structure that connects the first side and the second side; Alternatively, the accommodating space extends through the first side and the second side, and the side of the protrusion facing away from the main body is flush with the second side.

3. The sound-generating device as described in claim 1, characterized in that, The magnet assembly includes a central magnet and a side magnet. The side magnet is located outside the central magnet and is spaced apart from the central magnet to form the magnetic gap. Both the central magnet and the side magnet are made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke. The central magnet includes the main body and the protrusion.

4. The sound-generating device as described in claim 3, characterized in that, The sound-generating device further includes a vibration system disposed opposite to the magnetic circuit system. The vibration system includes a diaphragm assembly and a voice coil. One end of the voice coil is connected to the diaphragm assembly, and the other end of the voice coil is disposed corresponding to the magnetic gap. The magnetic circuit system drives the voice coil to reciprocate along a first direction. Along the first direction, the magnetic yoke has a first yoke plate disposed opposite to the magnetic gap. Wherein, the outer peripheral wall of the first yoke plate is respectively fitted to the side wall of the central magnet and the side magnet; and / or, the first yoke plate is provided with a recessed groove extending along the first direction corresponding to the magnetic gap, the recessed groove being used to avoid the voice coil.

5. The sound-generating device as described in claim 3, characterized in that, The side magnets form a closed, integrated ring structure and are arranged around the central magnet; Alternatively, the side magnets may include multiple side magnets, with adjacent side magnets connected end to end to form a closed ring structure, and arranged around the central magnet; Alternatively, the side magnets may include a plurality of them, which are spaced apart and arranged around the central magnet to form a first gap between adjacent side magnets.

6. The sound-generating device as described in claim 3, characterized in that, The magnetic circuit system further includes a magnetic guide plate assembly, which includes a central magnetic guide plate and side magnetic guide plates. The central magnetic guide plate is located on the side of the central magnet facing away from the magnetic guide yoke, and the side magnetic guide plates are located on the side of the side magnet facing away from the magnetic guide yoke. Wherein, the side magnetic plates form a closed integral ring structure; or, the side magnetic plates include multiple ones, and adjacent side magnetic plates are connected end to end to form a closed ring structure; or, the side magnetic plates include multiple ones, and the multiple side magnetic plates are spaced apart to form a second gap between adjacent side magnetic plates. And / or, the side magnetic plate is square, and sound-permeable holes are provided at the four corners of the side magnetic plate; And / or, the side magnetic plate has a groove extending along the first direction on the side facing away from the side magnet, the groove being used to avoid the lead portion of the voice coil.

7. The sound-generating device as claimed in claim 1, characterized in that, The magnet assembly includes a central magnet, a side magnet, and a common magnet. The side magnet is located outside the central magnet and the common magnet. The central magnet, the side magnet, and the common magnet are all made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke. The central magnet and the common magnet each include the main body and the protrusion. The central magnet includes at least two, and the shared magnet includes at least one. Each of the shared magnets is located between two adjacent central magnets and is spaced apart from the central magnets. Wherein, the central magnet and the common magnet are arranged at intervals along the second direction, and each of the central magnets is spaced apart from the side magnets and the common magnet to form the magnetic gap; or, the magnetic gap includes a first magnetic gap and a second magnetic gap, the central magnet is spaced apart from the side magnets and the common magnet to form the first magnetic gap, and the central magnet is spaced apart from two adjacent common magnets to form the second magnetic gap.

8. The sound-generating device as claimed in claim 7, characterized in that, The central magnet includes two components, and the common magnet includes one component. The two central magnets are located on opposite sides of the common magnet. The magnetic yoke has a first yoke plate and a second yoke plate disposed opposite to the magnetic gap. The outer peripheral wall of the first yoke plate is respectively attached to the side wall of the central magnet and the side magnet, and the outer peripheral wall of the second yoke plate is respectively attached to the side wall of the central magnet and the common magnet. And / or, the first yoke plate and the second yoke plate are provided with recessed grooves corresponding to the magnetic gap for avoiding the voice coil. And / or, the side magnets form a closed, integral ring structure and are arranged around the central magnet and the common magnet; or, the side magnets include multiple ones, with adjacent side magnets connected end to end to form a closed ring structure and arranged around the central magnet and the common magnet; or, the side magnets include multiple ones, with multiple side magnets spaced apart and arranged around the central magnet and the common magnet, so that a first gap is formed between adjacent side magnets; And / or, the common magnet extends along a third direction perpendicular to the second direction and is connected to the side magnet; wherein the side magnet and the common magnet are integrally formed.

9. The sound-generating device as claimed in claim 7, characterized in that, The magnetic circuit system further includes a magnetic guide plate assembly, which includes a central magnetic guide plate, side magnetic guide plates, and a common magnetic guide plate. The central magnetic guide plate is located on the side of the central magnet facing away from the magnetic guide yoke, the side magnetic guide plates are located on the side of the side magnet facing away from the magnetic guide yoke, and the common magnetic guide plate is located on the side of the common magnet facing away from the magnetic guide yoke. Wherein, the side magnetic plates form a closed integral ring structure; or, the side magnetic plates include multiple ones, and adjacent side magnetic plates are connected end to end to form a closed ring structure; or, the side magnetic plates include multiple ones, and the multiple side magnetic plates are spaced apart to form a second gap between adjacent side magnetic plates. And / or, the side magnetic plate is square, and sound-permeable holes are provided at the four corners of the side magnetic plate; And / or, the side magnetic plate is provided with a groove on the side facing away from the side magnet, the groove being used to avoid the lead portion of the voice coil; And / or, the common magnetic conductive plate extends along a third direction perpendicular to the second direction and is connected to the side magnetic conductive plate; wherein, the side magnetic conductive plate and the common magnetic conductive plate are integrally formed.

10. The sound-generating device as claimed in claim 1, characterized in that, The sound-generating device further includes a vibration system that vibrates along a first direction. The vibration system includes a diaphragm assembly and a voice coil connected to the diaphragm assembly. The diaphragm assembly is opposite to and spaced apart from the magnetic circuit system, and the voice coil is correspondingly arranged with respect to the magnetic gap. The diaphragm assembly has a conductive layer, the voice coil has a lead portion, one end of the conductive layer is electrically connected to an external circuit, and the other end of the conductive layer is connected to the lead portion.

11. The sound-generating device as claimed in claim 10, characterized in that, The diaphragm assembly includes a diaphragm and a dome. The diaphragm includes an inner ring portion, a folded ring portion surrounding the inner ring portion, and a fixing portion surrounding the folded ring portion. The inner ring portion forms a hollow hole. The dome is connected to the inner ring portion and covers the hollow hole. The diaphragm is provided with the conductive layer. The voice coil is connected to the dome.

12. The sound-generating device as claimed in claim 11, characterized in that, The conductive layer extends from the inner ring portion to the fixing portion. The periphery of the dome is connected to the side of the inner ring portion facing the magnetic circuit system. The dome is provided with a through hole corresponding to the conductive layer. The lead portion passes through the through hole and connects to the conductive layer. And / or, the dome is provided with a protrusion extending toward the magnetic circuit system, the protrusion being connected to the voice coil; And / or, the sound-generating device further includes a housing, the outer periphery of the diaphragm assembly is connected to one end of the housing, and the magnetic circuit system is connected to the other end of the housing; wherein, the housing is provided with a conductive element, and the conductive layer is connected and conductive to the conductive element.

13. The sound-generating device as claimed in claim 11, characterized in that, The magnetic circuit system is provided with a plurality of magnetic gaps, which are arranged at intervals along a second direction, the second direction being perpendicular to the first direction; The voice coils include a plurality of voice coils, each of which is connected to the diaphragm assembly and is arranged at intervals along the second direction. Each voice coil is correspondingly provided with a magnetic gap. The multiple voice coils are connected in series.

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

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