Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibration system of the sound production device vibrates along a first direction, the vibration system comprises a diaphragm assembly and a voice coil, and a plurality of magnet assemblies of a magnetic circuit system are all made of neodymium iron boron materials and are integrally hot-pressed with a magnetic yoke; a yoke plate of the magnetic conductive yoke has a first size L1 along the second direction and a second size L2 along the third direction, the first size L1 is smaller than the second size L2, the first direction, the second direction and the third direction are perpendicular in pairs, the thickness of the voice coil is defined as the thickness D of the voice coil, and the thickness D of the voice coil and the first size L1 meet the condition that D / L1 is larger than or equal to 0.1 and smaller than 1. The invention aims to provide the sound production device for improving the reliability of the magnetic circuit system, the sound production device not only realizes the ultrathin design of the magnetic circuit, but also increases the magnet volume of the magnetic circuit system, thereby improving the sound production performance of the sound production device, enabling the structure of the magnetic circuit system to be good in reliability and not easy to break, and improving the use stability of a product.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducer technology, and in particular to a sound-generating device and an electronic device using the sound-generating device. Background Art

[0002] In recent years, with the rapid development of the smart electronics field, consumer electronics products have ushered in a new wave of innovation. Foldable electronic products have gradually begun to enter the market. Terminal manufacturers have successively launched ultra-thin foldable products such as foldable mobile phones, foldable tablets, foldable notebooks, etc. Smartphones have already appeared in the X or Y direction double folding or even triple folding products, which requires the thickness of the single side of the device to be thinner and thinner.

[0003] Speakers, as crucial electroacoustic transducers in consumer electronics, are also becoming increasingly thinner, driven by the need for thinner and lighter devices. This poses significant challenges to the design and reliability of the speaker's internal space. In related technologies, as the speaker's exterior thickness decreases, the thickness of its internal components, such as magnets, magnetic plates, and yokes, must also be reduced. The thinning of magnets, in particular, significantly increases the risk of speaker use. Because magnets are brittle, they are prone to breakage after being thinned, resulting in significant yield losses and low mass production performance. Summary of the Invention

[0004] The main purpose of the present invention is to provide a sound-producing device and an electronic device, aiming to provide a sound-producing device that improves the reliability of the magnetic circuit system. The sound-producing device not only realizes an ultra-thin design of the magnetic circuit, but also increases the volume of the magnet of the magnetic circuit system, thereby improving the sound performance of the sound-producing device, and makes the structural reliability of the magnetic circuit system good, not easy to break, and improves the stability of the product.

[0005] To achieve the above object, the present invention provides a sound-generating device, comprising: a vibration system that vibrates in a first direction, the vibration system comprising a diaphragm assembly and a voice coil connected to the diaphragm assembly; and a magnetic circuit system, the magnetic circuit system being arranged relative to the diaphragm assembly, the magnetic circuit system comprising a magnetic yoke and a plurality of magnet assemblies connected to the magnetic yoke, the plurality of magnet assemblies being spaced apart to form a magnetic gap, the end of the voice coil remote from the diaphragm assembly being arranged relative to the magnetic gap, the plurality of magnet assemblies being made of neodymium iron boron material and integrally hot-pressed with the magnetic yoke; In which, the magnetic yoke is provided with a accommodating space, the magnet assembly includes a main body portion provided on the side of the magnetic yoke close to the diaphragm assembly and a protrusion extending into the accommodating space, the outer periphery of the protrusion is fitted with the inner wall of the accommodating space, the magnetic yoke includes a yoke plate opposite to the magnetic gap along the first direction, the outer periphery of the yoke plate is fitted with the side wall of the magnet assembly, the yoke plate has a first dimension L1 along the second direction and a second dimension L2 along the third direction, the first dimension L1 is smaller than the second dimension L2, the first direction, the second direction and the third direction are arranged perpendicular to each other, the thickness of the voice coil is defined as D, and the thickness D of the voice coil and the first dimension L1 satisfy: 0.1≤D / L1<1.

[0006] In one embodiment, the plurality of magnet assemblies include a central magnet and side magnets, the side magnets are located outside the central magnet and spaced apart from the central magnet to form the magnetic gap, and the outer peripheral wall of the yoke plate is respectively disposed in contact with the side walls of the central magnet and the side magnets; Wherein, the central magnet includes the main body and the protrusion.

[0007] In one embodiment, the side magnets form a closed integral ring structure and are arranged around the central magnet; Alternatively, the side magnets include a plurality of adjacent side magnets connected end to end to form a closed ring structure and arranged around the central magnet; Alternatively, the side magnets include a plurality of side magnets, and the plurality of side magnets are spaced apart and arranged around the central magnet, so that a first gap is formed between adjacent side magnets.

[0008] In one embodiment, the magnetic circuit system further includes a magnetic conductive plate assembly, the magnetic conductive plate assembly including a central magnetic conductive plate and a side magnetic conductive plate, the central magnetic conductive plate being arranged on a side of the central magnet facing away from the magnetic conductive yoke, and the side magnetic conductive plate being arranged on a side of the side magnet facing away from the magnetic conductive yoke; The side magnetic conductive plates form a closed integral ring structure; or, the side magnetic conductive plates include a plurality of them, and adjacent side magnetic conductive plates are connected end to end to form a closed ring structure; or, the side magnetic conductive plates include a plurality of them, and the plurality of side magnetic conductive plates are spaced apart to form a second gap between adjacent side magnetic conductive plates; And / or, the side magnetic conductive plate is square, and four corners of the side magnetic conductive plate are respectively provided with sound-transmitting holes arranged opposite to the diaphragm assembly; And / or, a groove extending along the first direction is provided on a side of the side magnetic conductive plate facing away from the side magnet, and the groove is used to avoid the lead portion of the voice coil.

[0009] In one embodiment, the voice coils include two, both of which are connected to the diaphragm assembly and are spaced apart along the second direction; The plurality of magnet assemblies include side magnets, a common magnet, and two center magnets, wherein the side magnets are located outside the center magnets and the common magnet, and the common magnet is located between the two center magnets. The two center magnets and the common magnet are spaced apart along the second direction so that each center magnet is spaced apart from the side magnets and the common magnet to form a magnetic gap, and each voice coil is correspondingly disposed in relation to a magnetic gap. Wherein, the common magnet and the two central magnets each include the main body and the protruding portion.

[0010] In one embodiment, 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 a plurality of adjacent side magnets connected end to end to form a closed ring structure and are arranged around the central magnet and the common magnet; or, the side magnets include a plurality of adjacent side magnets, and the plurality of side magnets are 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 the third direction and is connected to the side magnet; wherein the side magnet and the common magnet are an integrally formed structure; And / or, the yoke plate includes a first yoke plate and a second yoke plate arranged opposite to the magnetic gap; wherein the outer peripheral wall of the first yoke plate is respectively fitted with the side walls of the central magnet and the side magnets, and the outer peripheral wall of the second yoke plate is respectively fitted with the side walls of the central magnet and the common magnet; And / or, the two voice coils are connected in series.

[0011] In one embodiment, the magnetic circuit system further includes a magnetic conductive plate assembly, the magnetic conductive plate assembly including a side magnetic conductive plate, a common magnetic conductive plate, and two central magnetic conductive plates, each of the central magnetic conductive plates being disposed on a side of the central magnet facing away from the magnetic conductive yoke, the side magnetic conductive plates being disposed on a side of the side magnet facing away from the magnetic conductive yoke, and the common magnetic conductive plate being disposed on a side of the common magnet facing away from the magnetic conductive yoke; The side magnetic conductive plates form a closed integral ring structure; or, the side magnetic conductive plates include a plurality of them, and adjacent side magnetic conductive plates are connected end to end to form a closed ring structure; or, the side magnetic conductive plates include a plurality of them, and the plurality of side magnetic conductive plates are spaced apart to form a second gap between adjacent side magnetic conductive plates; And / or, the side magnetic conductive plate is square, and four corners of the side magnetic conductive plate are respectively provided with sound-transmitting holes arranged opposite to the diaphragm assembly; And / or, a groove extending along the first direction is provided on a side of the side magnetic conductive plate facing away from the side magnet, and the groove is used to avoid the lead portion of the voice coil; And / or, the common magnetic conductive plate extends along the third direction and is connected to the side magnetic conductive plates; wherein the side magnetic conductive plates and the common magnetic conductive plate are an integrally formed structure.

[0012] In one embodiment, along the first direction, the yoke plate is provided with a recessed groove corresponding to the magnetic gap, and the recessed groove is used to avoid the voice coil; And / or, the accommodating space is a groove structure provided on the side of the magnetic yoke facing the magnet assembly; or, the accommodating space is a through-hole structure passing through the magnetic yoke; or, the accommodating space passes through the magnetic yoke, and the side of the protrusion facing away from the main body is flush with the side of the magnetic yoke facing away from the magnet assembly.

[0013] In one embodiment, the diaphragm assembly is provided with 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 electrically connected to the lead portion.

[0014] In one embodiment, the diaphragm assembly includes a diaphragm and a dome, the diaphragm includes an inner ring portion, a folded ring portion arranged around the inner ring portion, and a fixed portion arranged around 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, and the voice coil is connected to the dome.

[0015] In one embodiment, the conductive layer extends from the inner ring portion to the fixed portion, the periphery of the spherical top is connected to a side of the inner ring portion facing the magnetic circuit system, the spherical top is provided with a via hole corresponding to the conductive layer, and the lead portion passes through the via hole to connect to the conductive layer; And / or, the dome is provided with a protrusion extending toward the magnetic circuit system, and the protrusion is connected to the voice coil; And / or, the sound-generating device further includes a shell, the outer periphery of the diaphragm assembly is connected to one end of the shell, and the magnetic circuit system is connected to the other end of the shell; wherein, the shell is provided with a conductive part, and the conductive layer is connected and conductive to the conductive part.

[0016] The present invention further provides an electronic device, which includes the above-mentioned sound-generating device.

[0017] The sound-generating device of the technical solution of the present invention arranges the vibration system and the magnetic circuit system relative to each other, and arranges the magnetic circuit system as a magnetic yoke and a plurality of magnet assemblies connected to the magnetic yoke, so that the plurality of magnet assemblies are arranged at intervals and form a magnetic gap, and arranges the vibration system as a diaphragm assembly and a voice coil connected to the diaphragm assembly, so that one end of the voice coil is connected to the diaphragm assembly, and the other end of the voice coil is arranged relative to the magnetic gap, so that current is passed through the voice coil, so that the voice coil converts electrical energy into mechanical energy in the magnetic gap formed by the magnetic circuit system, so as to drive the voice coil to drive the diaphragm assembly to vibrate, thereby achieving sound generation; at the same time, by providing an accommodation space in the magnetic yoke, and arranging the magnet assembly as a main body arranged on the side of the magnetic yoke close to the diaphragm assembly and a protrusion extending into the accommodation space of the magnetic yoke, further by using neodymium iron boron material for the magnet assembly, and hot-pressing the magnet assembly and the magnetic yoke as an integral whole, so that the outer periphery of the protrusion of the magnet assembly is aligned with the magnetic yoke The inner wall of the accommodating space is fitted together, so that the magnet assembly and the magnetic yoke are "zero-matched", which can maximize the volume of the magnet assembly. Compared with sintered NdFeB, hot-pressed NdFeB can improve the mechanical strength of the magnet assembly and is not easy to break, so that the sound-generating device not only realizes an ultra-thin design of the magnetic circuit, but also increases the magnet volume of the magnetic circuit system, thereby improving the sound sensitivity and loudness of the sound-generating device, and makes the structural reliability of the magnetic circuit system good and not easy to break, thereby improving the stability of the product. Furthermore, by arranging a yoke plate opposite to the magnetic gap in a first direction on the magnetic yoke, the outer periphery of the yoke plate is fitted together with the side wall of the magnet assembly, and the first dimension L1 of the yoke plate is set to be smaller than the second dimension L2, and the thickness D of the voice coil and the first dimension L1 of the yoke plate are set to satisfy: 0.1≤D / L1<1, so that the lightweight design requirements of the sound-generating device and the magnetic concentration effect and magnetic conductivity required by the sound-generating device can be taken into account. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 A schematic structural diagram of an embodiment of a sound-generating device provided by the present invention; Figure 2 A cross-sectional schematic diagram of an embodiment of a sound-generating device provided by the present invention; Figure 3 An exploded schematic diagram of an embodiment of a sound-generating device provided by the present invention; Figure 4 A schematic structural diagram of another embodiment of the sound-generating device provided by the present invention; Figure 5 A cross-sectional schematic diagram of another embodiment of the sound-generating device provided by the present invention; Figure 6 An exploded schematic diagram of another embodiment of the sound-generating device provided by the present invention; Figure 7 A schematic structural diagram of another embodiment of the vibration system provided by the present invention; Figure 8 This is a schematic structural diagram of another embodiment of the diaphragm provided by the present invention.

[0020] Description of Figure Numbers: 100. Sounding device; 1. Housing; 11. Conductive member; 2. Magnetic circuit system; 21. Magnetic yoke; 211. Accommodating space; 214. Yoke plate; 215. Recessed groove; 22. Magnet assembly; 221. Center magnet; 2211. Main body; 2212. Raised portion; 222. Side magnet; 223. Common magnet; 23. Magnetic plate assembly; 231. Center magnetic plate; 232. Side magnetic plate; 23 21. Groove; 2322. Sound-permeable hole; 233. Common magnetic conductive plate; 24. Magnetic gap; 3. Vibration system; 31. Diaphragm assembly; 311. Diaphragm; 3111. Inner ring; 3112. Folding ring; 3113. Fixed part; 3114. Conductive layer; 3115. Hollow hole; 312. Dome; 3121. Via hole; 3122. Protrusion; 32. Voice coil; 321. Lead wire; 4. Mesh.

[0021] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or an option in which both A and B are satisfied.

[0025] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] The present invention provides a sound-generating device 100. It is understandable that the sound-generating device 100 is applied to an electronic device, which may be a mobile phone, earphones, smart wearable device, tablet computer, laptop computer, etc., without limitation herein.

[0027] Please refer to Figures 1 to 8 As shown, in an embodiment of the present invention, the sound-generating device 100 includes a vibration system 3 and a magnetic circuit system 2. The vibration system 3 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 magnetic circuit system 2 is arranged opposite to the diaphragm assembly 31. The magnetic circuit system 2 includes a magnetic yoke 21 and a plurality of magnet assemblies 22 connected to the magnetic yoke 21. The plurality of magnet assemblies 22 are arranged at intervals to form a magnetic gap 24. The voice coil 32 is arranged opposite to the magnetic gap 24 at one end away from the diaphragm assembly 31. The plurality of magnet assemblies 22 are all made of neodymium iron boron material and are hot-pressed integrally with the magnetic yoke 21.

[0028] In this embodiment, the sound-generating device 100 may be a sound-generating unit of a speaker, and the speaker may be a micro speaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 are arranged opposite to each other.

[0029] In order to better assemble the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100. In one embodiment, as Figures 1 to 6 As shown, the sound-generating device 100 further 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 .

[0030] It should be noted that the housing 1 is used to install, fix and support components such as the magnetic circuit system 2 and the vibration system 3, that is, the housing 1 provides an installation base for components such as the magnetic circuit system 2 and the vibration system 3. It can be understood that the housing 1 can be an integral structure or can be formed by the cooperation of multiple split structures, which is not limited here. The housing 1 in this embodiment can be optionally a square frame or frame structure, that is, the housing 1 has a cavity with openings at both ends, and the magnetic circuit system 2 and the vibration system 3 are respectively connected to the two sides of the housing 1 and are arranged relative to each other, so that the magnetic circuit system 2, the housing 1 and the vibration membrane 311 of the vibration system 3 enclose to form a vibration cavity.

[0031] It is understood that the sound-generating device 100 is used in an electronic device, that is, 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 housing or box structure independent of the electronic device. In this case, the housing 1 integrates the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 into a whole structure, thereby facilitating assembly and disassembly. Of course, the housing 1 of the sound-generating device 100 can also be configured as an integrally molded structure with the housing or box structure of the electronic device, which can effectively improve structural strength and sealing performance.

[0032] In this embodiment, the housing 1 is used to house and fix the vibration system 3 and magnetic circuit system 2, etc., so that the sound-generating device 100 can be used as an independent component in an electronic device or a sound module, which is not limited here. Of course, in other embodiments, the sound-generating device 100 can also be a modular structure, in which case the vibration system 3 and magnetic circuit system 2 of the sound unit are installed as multiple independent components on the housing of the modular structure, which is not limited here.

[0033] Optionally, the sound-generating device 100 is arranged in a rectangular shape. In this embodiment, the housing 1 of the sound-generating device 100 is optionally arranged in a rectangular shape. Figure 1 、 Figure 3 、 Figure 4 、 Figure 6 As shown, the shell 1 has two first sides and two second sides connected end to end, the two first sides and the two second sides enclose a rectangular frame structure, and the connection between the first side and the second side forms a corner, which is the corner position of the shell 1.

[0034] It should be noted that if Figures 1 to 7As shown, in one specific example, the vibration direction of the vibration system 3 of the sound-emitting device 100 is the first direction (i.e., the height direction of the housing 1), the short side direction of the sound-emitting device 100 (i.e., the extension direction of the first side of the housing 1) is the second direction, and the long side direction of the sound-emitting device 100 (i.e., the extension direction of the second side of the housing 1) is the third direction. In this case, the first direction, the second direction, and the third direction are perpendicular to each other. In this embodiment, the first direction is the thickness direction or Z direction of the sound-emitting 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-emitting device 100 can be the second direction, and the short side direction of the sound-emitting device 100 can be the third direction, and this is not limited here.

[0035] 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 housing 1, and the voice coil 32 is disposed corresponding to the magnetic gap 24. As will be understood, when 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, thereby producing sound.

[0036] It should be noted that the sound-generating device 100, as a key electroacoustic transducer component in consumer electronics, has been thinned as the overall device pursues a slimmer and lighter design. In related art, thinning the speaker's exterior requires simultaneous thinning of internal components, such as the magnet, magnetic plate, and yoke. Thinning the magnet, in particular, significantly increases risk. Micro speakers typically use sintered NdFeB magnets, which offer high performance, but are brittle and easily break after being thinned, resulting in significant yield loss and low mass production performance.

[0037] In this embodiment, the magnetic yoke 21 is provided with a receiving space 211, and the magnet assembly 22 includes a main body 2211 provided on the side of the magnetic yoke 21 close to the diaphragm assembly 31 and a protrusion 2212 extending into the receiving space 211, and the outer periphery of the protrusion 2212 is arranged to fit the inner wall of the receiving space 211.

[0038] It is understandable that, compared with the situation in which there are assembly tolerances and material tolerances in normal assembly, especially at the positions of some R angles, the tolerances are generally larger. Figure 2 、 Figure 3 、 Figure 5 and Figure 6As shown, by setting the magnetic circuit system 2 as a magnetic yoke 21 and a magnet assembly 22 connected to the magnetic yoke 21, a receiving space 211 is provided in the magnetic yoke 21, and the magnet assembly 22 is set as a main body 2211 provided on the side of the magnetic yoke 21 close to the diaphragm assembly 31 and a protrusion 2212 extending into the receiving space 211 of the magnetic yoke 21, and further by using neodymium iron boron material for the magnet assembly 22, the magnet assembly 22 and the magnetic yoke 21 are integrally hot-pressed, so that the outer periphery of the protrusion 2212 of the magnet assembly 22 is fitted with 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 "zero-matched", so that The connection between the magnet assembly 22 and the magnetic yoke 21 is almost completely fitted, eliminating assembly tolerances and material tolerances, and maximizing the volume of the magnet assembly 22. In addition, compared with sintered NdFeB, hot-pressed NdFeB can improve the mechanical strength of the magnet assembly 22 and is not easy to break. This allows the sound-emitting device 100 to not only achieve an ultra-thin magnetic circuit design, but also increase the magnet volume of the magnetic circuit system 2, thereby improving the product BL value of the sound-emitting device 100, improving its sound sensitivity and loudness, and making the structural reliability of the magnetic circuit system 2 good and not easy to break. This not only improves the product's stability in use, but also meets higher performance to compensate for the performance loss of the sound-emitting device 100 after being made thinner.

[0039] In one embodiment, the magnetically conductive yoke 21 includes a yoke plate 214 that opposes the magnetic gap 24 along a first direction. The outer periphery of the yoke plate 214 is aligned with the sidewall of the magnet assembly 22. The yoke plate 214 has a first dimension L1 along the second direction and a second dimension L2 along the third direction. The first dimension L1 is smaller than the second dimension L2. The first, second, and third directions are perpendicular to each other. The thickness of the voice coil 32 is defined as D. The thickness D of the voice coil 32 and the first dimension L1 satisfy the following relationship: 0.1 ≤ D / L1 < 1.

[0040] Understandably, Figure 2 、 Figure 3 、 Figure 5 and Figure 6As shown, the first dimension L1 of the yoke plate 214 is smaller than the second dimension L2. 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 yoke plate 214 satisfy the relationship: 0.1 ≤ D / L1 < 1. It should be noted that the first dimension L1 of the yoke plate 214 affects the magnetic field concentration effect and magnetic conductivity of the yoke plate 214. When L1 is too small, the magnetic field concentration effect and magnetic conductivity of the yoke plate 214 are limited, thereby affecting the magnetic field strength acting on the voice coil 32. When L1 is too large, while the magnetic field concentration effect and magnetic conductivity are maintained, the weight of the magnetic circuit system 2 is increased and the installation volume of the magnet assembly 22 is reduced, which affects the B value of the magnetic circuit system 2 and the sound performance of the sound-generating device 100. When 0.1 ≤ D / L1 < 1, the magnetic field concentration effect and magnetic conductivity of the yoke plate 214 are both met, as well as the design requirements of a lightweight and high acoustic performance of the sound-generating device 100.

[0041] In this embodiment, the ratio of the thickness D of the voice coil 32 to the first dimension L1 of the yoke plate 214 can be selected from 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and the like, without limitation. Optionally, the first dimension L1 of the yoke plate 214 is at least greater than the width of the magnetic gap 24 (i.e., the distance between the center magnet 221 and the side magnets 222).

[0042] The sound-generating device 100 of the present invention is configured by arranging the vibration system 3 and the magnetic circuit system 2 relative to each other, and configuring the magnetic circuit system 2 as a magnetic yoke 21 and a plurality of magnet assemblies 22 connected to the magnetic yoke 21, so that the plurality of magnet assemblies 22 are spaced apart and form a magnetic gap 24, and configuring the vibration system 3 as a diaphragm assembly 31 and a voice coil 32 connected to the diaphragm assembly 31, so that one end of the voice coil 32 is connected to the diaphragm assembly 31, and the other end of the voice coil 32 is configured relative to the magnetic gap 24, so that current is passed through the voice coil 32, so that the voice coil 32 is magnetically The electric energy is converted into mechanical energy in the magnetic gap 24 formed by the circuit system 2, so as to drive the voice coil 32 to drive the diaphragm assembly 31 to vibrate, thereby achieving sound production; at the same time, by providing a receiving space 211 in the magnetic yoke 21, and configuring the magnet assembly 22 to include a main body 2211 provided on the side of the magnetic yoke 21 close to the diaphragm assembly 31 and a protrusion 2212 extending into the receiving space 211 of the magnetic yoke 21, and further by using neodymium iron boron material for the magnet assembly 22, and hot-pressing the magnet assembly 22 and the magnetic yoke 21 as one body, the protrusion 2212 of the magnet assembly 22 is formed. The outer periphery of the rising portion 2212 is fitted with the inner wall of the accommodating space 211 of the magnetic yoke 21, so that the magnet assembly 22 and the magnetic yoke 21 are "zero-matched", which can maximize the volume of the magnet assembly 22. Compared with sintered NdFeB, hot-pressed NdFeB can improve the mechanical strength of the magnet assembly 22 and is not easy to break. The sound-generating device 100 not only realizes an ultra-thin design of the magnetic circuit, but also increases the magnet volume of the magnetic circuit system 2, thereby improving the sound sensitivity and loudness of the sound-generating device 100, and making the magnetic circuit system 2 have good structural reliability and not easy to break. Cracks are prevented, thereby improving the stability of the product. Furthermore, a yoke plate 214 is provided on the magnetic yoke 21, which is opposite to the magnetic gap 24 along the first direction, so that the outer periphery of the yoke plate 214 is fitted with the side wall of the magnet assembly 22, and the first dimension L1 of the yoke plate 214 is set to be smaller than the second dimension L2. The thickness D of the voice coil 32 and the first dimension L1 of the yoke plate 214 are set to satisfy: 0.1≤D / L1<1. In this way, the requirements of the lightweight design of the sound-generating device 100 and the magnetic focusing effect and magnetic conductivity required by the sound-generating device 100 can be taken into account.

[0043] It should be noted that the accommodation space 211 of the magnetic yoke 21 can be a groove structure or a through-hole structure, which is not limited here. Optionally, the accommodation space 211 is a groove structure provided on the side of the magnetic yoke 21 facing the magnet assembly 22. In this embodiment, Figure 2 、 Figure 3 、 Figure 5 and Figure 6 As shown, the accommodating space 211 is a through-hole structure penetrating the magnetic yoke 21 .

[0044] In one embodiment, the accommodating space 211 passes through the magnetic yoke 21, and the side of the protrusion 2212 facing away from the main body 2211 is flush with the side of the magnetic yoke 21 facing away from the magnet assembly 22. It can be understood that Figure 2 and Figure 5 As shown, the side of the magnetic yoke 21 facing away from the magnet assembly 22 and the side of the protrusion 2212 of the magnet assembly 22 facing away from the main body 2211 are arranged flush, so that the matching structure of the magnet assembly 22 and the magnetic yoke 21 is made more compact.

[0045] In one embodiment, the yoke plate 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 dimension H2 and the maximum dimension H1 satisfy: 2≤H2 / H1≤10.

[0046] As can be understood, if the maximum dimension H1 of the yoke plate 214 is too small, the magnetic field concentration and magnetic conductivity of the yoke plate 214 will be affected. If the maximum dimension H1 of the yoke plate 214 is too large, the weight of the magnetic circuit system 2 will increase, failing to meet the lightweight design requirements of the sound-generating device 100. Furthermore, under the condition of the same product height, an excessively large maximum dimension H1 of the yoke plate 214 will result in a smaller maximum dimension H2 of the magnet assembly 22, thereby reducing the volume of the magnet assembly 22 and the magnetic field strength of the magnetic circuit system 2. This will reduce the product BL value of the sound-generating device 100 and affect the acoustic performance of the sound-generating device 100.

[0047] In this embodiment, by setting the ratio of the maximum dimension H2 of the magnet assembly 22 to the maximum dimension H1 of the yoke plate 214 within a range of 2 to 10, the yoke plate 214 not only satisfies the magnetic field concentration and magnetic conductivity required by the sound-generating device 100, but also ensures that the volume of the magnet assembly 22 meets the usage requirements, that is, ensures 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 dimension H2 of the magnet assembly 22 to the maximum dimension H1 of the yoke plate 214 can be 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., which is not limited here.

[0048] In one embodiment, along the first direction, the yoke plate 214 is provided with a recessed groove 215 corresponding to the magnetic gap 24, and the recessed groove 215 is used to avoid the voice coil 32. It can be understood that, as Figure 2 、 Figure 3 、 Figure 5 and Figure 6 As shown, by providing the recessed groove 215 on the yoke plate 214 , interference between the voice coil 32 and the yoke plate 214 in the vibration direction can be prevented, thereby providing a larger space for the vibration of the voice coil 32 by utilizing the recessed groove 215 .

[0049] In one embodiment, the plurality of magnet assemblies 22 include a central magnet 221 and side magnets 222. The side magnets 222 are located on the outside of the central magnet 221 and are spaced apart from the central magnet 221 to form a magnetic gap 24. The outer peripheral walls of the yoke plate 214 are respectively fitted with the side walls of the central magnet 221 and the side magnets 222. The central magnet 221 includes a main body 2211 and a protrusion 2212.

[0050] In this embodiment, if Figures 1 to 3 As shown, by configuring the magnet assembly 22 to have a structure of a central magnet 221 and side magnets 222, the side magnets 222 are located outside the central magnet 221, and the side magnets 222 are spaced apart from the central magnet 221 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 arranged corresponding to the magnetic gap 24.

[0051] It can be understood that by making the central magnet 221 and the side magnets 222 of the magnet assembly 22 adopt neodymium iron boron material, the central magnet 221 and the side magnets 222 are hot-pressed integrally with the magnetic yoke 21, so that the central magnet 221 and the side magnets 222 can be "zero-matched" with the magnetic yoke 21, that is, the central magnet 221 and the side magnets 222 are almost completely fitted with the connection between the magnetic yoke 21, eliminating the assembly tolerance and material tolerance, thereby increasing the volume of the central magnet 221 and the side magnets 222, improving the performance of the sound-emitting device 100, and the central magnet 221 and the side magnets 222 have good structural reliability due to the hot-pressed neodymium iron boron magnets and are not easy to break.

[0052] In this embodiment, if Figure 2 As shown, the center magnet 221 includes a main body 2211 and a raised portion 2212. The main body 2211 of the center magnet 221 is connected to the first side of the magnetic yoke 21, and the raised portion 2212 of the center magnet 221 extends into the accommodating space 211 of the magnetic yoke 21, so that the outer periphery of the raised portion 2212 is arranged in contact with the inner wall of the accommodating space 211 of the magnetic yoke 21. Optionally, the side of the raised portion 2212 away from the main body 2211 is arranged flush with the side of the magnetic yoke 21 facing away from the center magnet 221. Of course, in other embodiments, the side magnet 222 includes a main body 2211 and a raised portion 2212, which is not limited here.

[0053] Understandably, Figures 1 to 7As shown, the vibration system 3 of the sound-generating device 100 vibrates along the first direction, that is, the magnetic circuit system 2 drives the voice coil 32 to vibrate back and forth along the first direction. In this embodiment, along the first direction, the magnetic yoke 21 has a yoke plate 214 arranged opposite to the magnetic gap 24. Optionally, the outer peripheral wall of the yoke plate 214 is respectively arranged to fit the side walls of the center magnet 221 and the side magnet 222, so that the yoke plate 214 and the center magnet 221 and the side magnet 222 are "zero-matched", that is, the center magnet 221 and the side magnet 222 are almost completely fitted at the connection with the magnetic yoke 21, eliminating the assembly tolerance and material tolerance, thereby increasing the volume of the center magnet 221 and the side magnet 222 and improving the performance of the sound-generating device 100.

[0054] Optionally, the side magnets 222 form a closed, integral ring structure and are disposed around the center magnet 221. It will be appreciated that by configuring the side magnets 222 as an integrally formed ring structure, the side magnets 222 are disposed around the center magnet 221. This not only effectively increases the magnet volume of the magnet assembly 22 in the magnetic circuit system 2, thereby improving the BL value and significantly enhancing overall device performance and sound loudness, but also simplifies processing and assembly steps. Alternatively, the side magnets 222 may include multiple adjacent side magnets 222 connected end-to-end to form a closed ring structure, which is then disposed around the center magnet 221. It will be appreciated that by configuring the 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 can be effectively increased, thereby improving the BL value and significantly enhancing overall device performance and sound loudness. Alternatively, the side magnets 222 may include multiple side magnets 222, each spaced apart and disposed around the center magnet 221, such that a first gap is formed between adjacent side magnets 222. It can be understood that by arranging multiple side magnets 222 at intervals, a first gap is formed between adjacent side magnets 222. In this way, when the sound-emitting device 100 is provided with a centering support plate and other structures, the first gap can be used to conveniently provide installation and avoidance space for the centering support plate.

[0055] In one embodiment, the magnetic circuit system 2 also includes a magnetic conductive plate assembly 23, which includes a central magnetic conductive plate 231 and a side magnetic conductive plate 232. The central magnetic conductive plate 231 is arranged on the side of the central magnet 221 facing away from the magnetic yoke 21, and the side magnetic conductive plate 232 is arranged on the side of the side magnet 222 facing away from the magnetic yoke 21.

[0056] In this embodiment, if Figure 2 and Figure 3As shown, by setting the magnetic conductive plate assembly 23, the central magnetic conductive plate 231 and the side magnetic conductive plate 232 of the magnetic conductive plate assembly 23 are respectively set corresponding to the central magnet 221 and the side magnet 222. In this way, the central magnetic conductive plate 231 and the side magnetic conductive plate 232 can respectively realize magnetic concentration and magnetic conduction for the central magnet 221 and the side magnet 222, so that the magnetic circuit system 2 forms a magnetic circuit, and the magnetic flux lines formed by the magnetic field can be gathered to pass through the voice coil 32 in the magnetic gap 24.

[0057] It is understood that the outline of the central magnetic plate 231 is consistent with the outline of the central magnet 221, and the outline of the side magnetic plate 232 is consistent with the outline of the side magnet 222. Optionally, the central magnetic plate 231 and the central magnet 221 are both plate-shaped structures.

[0058] 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, and the side magnets 222 can be a one-piece ring structure, or a closed ring structure formed by multiple side magnets 222, or multiple side magnets 222 arranged at intervals, etc., without limitation herein.

[0059] Alternatively, the side magnetic conductive plates 232 may include a plurality of adjacent side magnetic conductive plates 232 connected end-to-end to form a closed ring structure. It is understood that when the plurality of side magnetic conductive plates 232 form a closed ring structure, the side magnets 222 may be a single ring structure, a closed ring structure formed by a plurality of side magnets 222, or a plurality of side magnets 222 arranged at intervals, etc., without limitation herein.

[0060] Alternatively, the side magnetic conductive plates 232 may include a plurality of side magnetic conductive plates 232, which are spaced apart to form a second gap between adjacent side magnetic conductive plates 232. It is understood that when the plurality of side magnetic conductive plates 232 are spaced apart, the side magnets 222 may be a single ring structure, a closed ring structure formed by a plurality of side magnets 222, or spaced apart, etc., without limitation herein.

[0061] Optionally, the side magnetic conductive plates 232 and the side magnets 222 are arranged in a one-to-one correspondence, which is not limited here.

[0062] In one embodiment, the side magnetic conductive plate 232 is square in shape, and four corners of the side magnetic conductive plate 232 are respectively provided with sound-transmitting holes 2322 arranged opposite to the diaphragm assembly 31 .

[0063] In this embodiment, if Figure 3 and Figure 6As shown, by configuring the side magnetic conductive plate 232 to be a square ring structure, the side magnetic conductive plate 232 corresponds to the side magnet 222. It is understandable that by providing sound-permeable holes 2322 at the four corners of the side magnetic conductive plate 232, the diaphragm assembly 31 can quickly circulate the air pressure in the vibration cavity or the back cavity when vibrating, thereby achieving air pressure balance, thereby making the sound output of the sound-generating device 100 smoother.

[0064] As will be appreciated, the side magnets 222 are provided with a relief structure corresponding to the sound-transmitting holes 2322 of the side magnetic conductive plates 232. In this embodiment, the sound-generating device 100 further 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 via the side magnetic conductive plates 232. Optionally, the side magnetic conductive plates 232 and the housing 1 are integrally formed, which is not a limitation herein.

[0065] In one embodiment, a groove 2321 extending along the first direction is formed on a side of the side magnetic conductive plate 232 facing away from the side magnet 222 . The groove 2321 is used to avoid the lead portion 321 of the voice coil 32 .

[0066] In this embodiment, if Figure 3 As shown, by providing a groove 2321 on the side magnetic conductive plate 232, such that the groove 2321 is located on the side of the side magnetic conductive plate 232 facing away from the side magnet 222 and extends along the first direction, the groove 2321 can provide a relief 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 corners of the side magnetic conductive plate 232.

[0067] In one embodiment, the plurality of magnet assemblies 22 include a central magnet 221 , side magnets 222 and a common magnet 223 . The side magnets 222 are located outside the central magnet 221 and the common magnet 223 . The central magnet 221 and the common magnet 223 are spaced apart along the second direction.

[0068] In this embodiment, if Figures 4 to 6 As shown, there are at least two central magnets 221 and at least one common magnet 223 . Each common magnet 223 is located between two adjacent central magnets 221 and is spaced apart from the central magnets 221 .

[0069] It will be understood that when there are two central magnets 221 and one common magnet 223, each central magnet 221 is spaced apart from the side magnets 222 and the common magnet 223 to form a magnetic gap 24. When the number of central magnets 221 is N and the number of common magnets 223 is N-1, 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 common magnet 223 to form the first magnetic gap, and the central magnet 221 is spaced apart from two adjacent common magnets 223 to form a second magnetic gap.

[0070] 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 provided corresponding to a magnetic gap 24. Figures 4 to 7 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 arranged corresponding to a magnetic gap 24, and each voice coil 32 is arranged around a central magnet 221.

[0071] 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 either side are spaced apart from the side magnets 222 and shared magnets 223, respectively, to form two first magnetic gaps. The central magnet 221 in the middle is spaced apart from the two adjacent shared magnets 223 to form a second magnetic gap. Optionally, the number of central magnets 221 is at least three, and the number of magnetic gaps 24 (i.e., the sum of the first and 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 this is not limited here.

[0072] It can be understood that when the space is limited, the sound-emitting 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 to multiple magnet assemblies 22, thereby effectively increasing the magnet volume of the magnet assembly 22 in the magnetic circuit system 2 to increase the BL value, thereby greatly improving the sound sensitivity and loudness of the sound-emitting device 100 and improving the acoustic performance.

[0073] In one embodiment, if Figures 5 to 7As shown, the voice coils 32 include two, both of which are connected to the diaphragm assembly 31 and are arranged at intervals along the second direction; the multiple magnet assemblies 22 include side magnets 222, a common magnet 223 and two center magnets 221, the side magnets 222 are located on the outside of the center magnets 221 and the common magnet 223, the common magnet 223 is located between the two center magnets 221, and the two center magnets 221 and the common magnet 223 are arranged at intervals along the second direction, so that each center magnet 221 is spaced apart from the side magnets 222 and the common magnet 223 to form a magnetic gap 24, and each voice coil 32 is arranged corresponding to a magnetic gap 24.

[0074] 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. It is understandable that this allows the central magnet 221, the side magnets 222, and the common magnet 223 to achieve "zero matching" with the magnetic yoke 21, that is, the central magnet 221, the side magnets 222, and the common magnet 223 are almost completely fitted at the connection with the magnetic yoke 21, eliminating assembly tolerances and material tolerances, thereby increasing the magnet volume of the magnet assembly 22 and improving the structural strength of the assembly structure of the central magnet 221, the side magnets 222, and the common magnet 223 with the magnetic yoke 21, making it less likely to break.

[0075] Optionally, the common magnet 223 and the two central magnets 221 each include a main body 2211 and a protrusion 2212. Figure 5 and Figure 6 As shown, the magnetic yoke 21 is provided with accommodation spaces 211 corresponding to the central magnet 221 and the common magnet 223. It can be understood that the number of the accommodation spaces 211 is consistent with the number of the protrusions 2212, which is not limited here.

[0076] In one embodiment, the yoke plate 214 includes a first yoke plate and a second yoke plate arranged opposite to the magnetic gap 24; wherein the outer peripheral wall of the first yoke plate is respectively fitted with the side walls of the central magnet 221 and the side magnet 222, and the outer peripheral wall of the second yoke plate is respectively fitted with the side walls of the central magnet 221 and the common magnet 223.

[0077] Understandably, Figures 5 to 7 As shown, each center magnet 221 cooperates with the side magnets 222 and the common magnet 223 to form a magnetic gap 24. The magnetic yoke 21 is provided with a first yoke plate and a second yoke plate 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 and the second yoke plate of the magnetic yoke 21 are provided to correspond to the two long sides or the two short sides of the magnetic gap 24, respectively, without limitation herein.

[0078] In this embodiment, if Figure 5As shown, the outer peripheral wall of the first yoke plate is respectively fitted with the side walls of the central magnet 221 and the side magnet 222 , and the outer peripheral wall of the second yoke plate is respectively fitted with the side walls of the central magnet 221 and the common magnet 223 .

[0079] Optionally, the first and second yoke plates are provided with recessed grooves 215 extending along the first direction corresponding to the magnetic gap 24. The recessed grooves 215 are used to avoid the voice coil 32. It will be appreciated that the recessed grooves 215 provided on both the first and second yoke plates can prevent interference between the voice coil 32 and the first and second yoke plates in the vibration direction, thereby providing more space for the voice coil 32 to vibrate.

[0080] It should be noted that the first yoke plate and the second yoke plate both extend along the third direction, and the first yoke plate and the second yoke plate are spaced apart along the second direction. In this embodiment, the first yoke plate and the second yoke plate both have a maximum dimension H1 along the first direction. Optionally, the maximum dimension H1 of the first yoke plate along the first direction is the same as the maximum dimension H1 of the second yoke plate along the first direction. It is understood that the maximum dimension H1 of the first yoke plate and the second yoke plate and the maximum dimension H2 of the magnet assembly 22 satisfy the following relationship: 2≤H2 / H1≤10, which is not limited here.

[0081] It will be appreciated that each of the first and second yoke plates has a first dimension L1 along the second direction and a second dimension L2 along the third direction, with the first dimension L1 of the first and second yoke plates being smaller than the second dimension L2. Alternatively, the first dimension L1 of the first yoke plate is the same as the first dimension L1 of the second yoke plate, and the second dimension L2 of the first yoke plate is the same as the second dimension L2 of the second yoke plate. In this embodiment, the first dimension L1 of the first and second yoke plates and the thickness D of the voice coil 32 satisfy the following relationship: 0.1 ≤ D / L1 < 1, which is not limited herein.

[0082] Optionally, the side magnets 222 form a closed, integrated ring structure and surround the center magnet 221 and the common magnet 223. This effectively increases the magnet volume of the side magnets 222, thereby enhancing the magnetic field strength. It also simplifies the processing and assembly procedures for the side magnets 222.

[0083] Of course, in other embodiments, the side magnets 222 include multiple adjacent side magnets 222 connected end to end to form a closed ring structure, which is arranged around the central magnet 221 and the common magnet 223. This can effectively increase the magnet volume of the side magnets 222, thereby improving the magnetic field strength.

[0084] Alternatively, the side magnets 222 may include a plurality of side magnets 222, each spaced apart and arranged around the center magnet 221 and the common magnet 223, such that a first gap is formed between adjacent side magnets 222. This arrangement allows the first gaps between adjacent side magnets 222 to provide more space for mounting and evacuating the centering support of the sound-generating device 100.

[0085] In one embodiment, if Figure 6 As shown, the common magnet 223 extends along the third direction and is connected to the side magnet 222. It is understandable that the common magnet 223 and the side magnet 222 can be welded or bonded. Optionally, the side magnet 222 and the common magnet 223 are an integrally formed structure. Such an arrangement not only simplifies the structural design of the magnetic circuit system 2, but also, since there is no need to retain a glue gap between the side magnet 222 and the common magnet 223, the volume of the magnet is further increased, thereby improving the magnetic field strength.

[0086] In one embodiment, the magnetic circuit system 2 also includes a magnetic conductive plate assembly 23, which includes a side magnetic conductive plate 232, a common magnetic conductive plate 233 and two central magnetic conductive plates 231. Each central magnetic conductive plate 231 is arranged on the side of a central magnet 221 facing away from the magnetic yoke 21, the side magnetic conductive plate 232 is arranged on the side of the side magnet 222 facing away from the magnetic yoke 21, and the common magnetic conductive plate 233 is arranged on the side of the common magnet 223 facing away from the magnetic yoke 21.

[0087] In this embodiment, if Figure 5 and Figure 6 As shown, by setting the magnetic conductive plate assembly 23, the central magnetic conductive plate 231, the side magnetic conductive plate 232, and the common magnetic conductive plate 233 of the magnetic conductive plate assembly 23 are respectively set corresponding to the central magnet 221, the side magnet 222, and the common magnet 223. In this way, the central magnetic conductive plate 231, the side magnetic conductive plate 232, and the common magnetic conductive plate 233 can respectively realize magnetic concentration and magnetic conduction for the central magnet 221, the side magnet 222, and the common magnet 223, so that the magnetic circuit system 2 forms a magnetic circuit, and the magnetic lines of force formed by the magnetic field can be gathered to pass through the voice coil 32 in the magnetic gap 24.

[0088] It is understood that the outline of the central magnetic conductive plate 231 is consistent with the outline of the central magnet 221, the outline of the side magnetic conductive plates 232 is consistent with the outline of the side magnet 222, and the outline of the shared magnetic conductive plate 233 is consistent with the outline of the shared magnet 223. Optionally, the central magnetic conductive plate 231 and the central magnet 221 are both plate-shaped structures. The shared magnetic conductive plate 233 and the shared magnet 223 are both plate-shaped structures.

[0089] In this embodiment, the central magnetic conductive plate 231 and the central magnet 221 are disposed in a one-to-one correspondence, and the common magnetic conductive plate 233 and the common magnet 223 are disposed in a one-to-one correspondence.

[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, and the side magnets 222 can be a one-piece ring structure, or a closed ring structure formed by multiple side magnets 222, or multiple side magnets 222 arranged at intervals, etc., without limitation herein.

[0091] Alternatively, the side magnetic conductive plates 232 may include a plurality of adjacent side magnetic conductive plates 232 connected end-to-end to form a closed ring structure. It is understood that when the plurality of side magnetic conductive plates 232 form a closed ring structure, the side magnets 222 may be a single ring structure, a closed ring structure formed by a plurality of side magnets 222, or a plurality of side magnets 222 arranged at intervals, etc., without limitation herein.

[0092] Alternatively, the side magnetic conductive plates 232 may include a plurality of side magnetic conductive plates 232, which are spaced apart to form a second gap between adjacent side magnetic conductive plates 232. It is understood that when the plurality of side magnetic conductive plates 232 are spaced apart, the side magnets 222 may be a single ring structure, a closed ring structure formed by a plurality of side magnets 222, or spaced apart, etc., without limitation herein.

[0093] Optionally, the side magnetic conductive plates 232 and the side magnets 222 are arranged in a one-to-one correspondence, which is not limited here.

[0094] In one embodiment, the side magnetic conductive plate 232 is square in shape, and four corners of the side magnetic conductive plate 232 are respectively provided with sound-transmitting holes 2322 arranged opposite to the diaphragm assembly 31 .

[0095] In this embodiment, if Figure 6 As shown, by configuring the side magnetic conductive plate 232 to be a square ring structure, the side magnetic conductive plate 232 corresponds to the side magnet 222. It is understandable that by providing sound-permeable holes 2322 at the four corners of the side magnetic conductive plate 232, the diaphragm assembly 31 can quickly circulate the air pressure in the vibration cavity or the back cavity when vibrating, thereby achieving air pressure balance, thereby making the sound output of the sound-generating device 100 smoother.

[0096] As will be appreciated, the side magnets 222 are provided with a relief structure corresponding to the sound-transmitting holes 2322 of the side magnetic conductive plates 232. In this embodiment, the sound-generating device 100 further 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 via the side magnetic conductive plates 232. Optionally, the side magnetic conductive plates 232 and the housing 1 are integrally formed, which is not a limitation herein.

[0097] In one embodiment, a groove 2321 extending along the first direction is formed on a side of the side magnetic conductive plate 232 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, grooves 2321 are provided in the side magnetic conductive plate 232, such that the grooves 2321 are located on the side of the side magnetic conductive plate 232 facing away from the side magnet 222 and extend along the first direction. Thus, when the voice coil 32 vibrates, the grooves 2321 provide relief for the lead wire 321 of the voice coil 32. Optionally, the grooves 2321 are provided at the four corners of the side magnetic conductive plate 232.

[0099] In one embodiment, the common magnetic conductive plate 233 extends along the third direction and is connected to the side magnetic conductive plates 232. It is understood that the common magnetic conductive plate 233 and the side magnetic conductive plates 232 may be welded or bonded together. Optionally, the side magnetic conductive plates 232 and the common magnetic conductive plate 233 are integrally formed. This arrangement can enhance the structural strength of the magnetic circuit system 2 and further improve the magnetic field strength.

[0100] In this embodiment, if Figures 1 to 7 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 of the vibration system 3 is consistent with the number of magnetic gaps 24 of the magnetic circuit system 2.

[0101] In order to achieve connection and conduction between the voice coil 32 and the external circuit, in one embodiment, the diaphragm assembly 31 is provided with a conductive layer 3114, and 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 electrically connected to the lead portion 321.

[0102] In this embodiment, if Figure 7 and Figure 8 As shown, the conductive layer 3114 can be a conductive coating applied to the diaphragm assembly 31; alternatively, the conductive layer 3114 can be a conductive adhesive or a metal conductive layer adhered to the diaphragm assembly 31, without limitation. It will be appreciated that by providing the conductive layer 3114 on the diaphragm assembly 31, the lead portion 321 of the voice coil 32 is electrically connected to the external circuit via the conductive layer 3114. This eliminates the space occupied by the centering arm, thereby increasing the volume of the magnet in the magnetic circuit system 2 and improving the product BL value of the sound-generating device 100.

[0103] 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 arranged around the inner ring portion 3111, and a fixed portion 3113 arranged around 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.

[0104] In this embodiment, if Figures 1 to 8 As shown, the diaphragm 311 includes an inner ring portion 3111, a folded ring portion 3112, and a fixed portion 3113, which are connected from the inside to the outside. The inner ring portion 3111 is connected to the dome 312, the fixed portion 3113 is connected to the housing 1, and the two voice coils 32 are connected to the dome 312. Optionally, the inner ring portion 3111 forms a hollow hole 3115, and the dome 312 is connected to the inner ring portion 3111 and covers the hollow hole 3115. This can reduce the weight of the diaphragm assembly 31.

[0105] 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 integrally injection molded or integrally processed, and this 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 which case the dome 312 and the inner ring portion 3111 of the diaphragm 311 can be connected by bonding, which is not limited here.

[0106] To further enhance the connection stability and waterproof sealing between the diaphragm 311 and the housing 1, the outer periphery of the diaphragm 311 bends and extends toward the housing 1 to form a bent portion, which is connected to the outer wall of the housing 1. In this embodiment, the end of the fixing portion 3113 away from the folding ring portion 3112 bends and extends toward the housing 1 to form a bent portion, which is connected to the outer wall of the housing 1. In other words, the bent portion is formed by the outer periphery of the fixing portion 3113 of the diaphragm 311 bending and extending toward the housing 1. Optionally, the inner ring portion 3111, the folding ring portion 3112, the fixing portion 3113, and the bent portion of the diaphragm 311 are integrally formed.

[0107] In one embodiment, the conductive layer 3114 extends from the inner ring portion 3111 to the fixed portion 3113, the periphery of the spherical top 312 is connected to the side of the inner ring portion 3111 facing the magnetic circuit system 2, and the spherical top 312 is provided with a via 3121 corresponding to the conductive layer 3114, and the lead portion 321 passes through the via 3121 to be connected to the conductive layer 3114.

[0108] In this embodiment, if Figure 7 and Figure 8As shown, by extending the conductive layer 3114 from the inner ring portion 3111 to the fixed portion 3113 and providing a through hole 3121 on the dome 312 , when the voice coil 32 is connected to the dome 312 , the lead portion 321 can pass through the through hole 3121 and connect to the conductive layer 3114 .

[0109] 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. 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. The protrusion 3122 of the dome 312 allows the voice coil 32 to be positioned appropriately within the magnetic gap 24, ensuring that more magnetic flux lines within the magnetic gap 24 pass through the voice coil 32.

[0110] In one embodiment, the sound-emitting 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 part 11, and the conductive layer 3114 is connected and conductive to the conductive part 11.

[0111] In this embodiment, if Figure 3 and Figure 6 As shown, by arranging the conductive member 11 on the housing 1 , when the fixing portion 3113 of the diaphragm 311 is connected to the housing 1 , the conductive layer 3114 on the fixing portion 3113 is connected and conductive to the conductive member 11 .

[0112] In one embodiment, the magnetic circuit system 2 is provided with a plurality of magnetic gaps 24 , which are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction; the voice coil 32 includes a plurality of voice coils 32 , which are all connected to the diaphragm assembly 31 and are arranged at intervals along the second direction, and each voice coil 32 is provided corresponding to a magnetic gap 24 .

[0113] Understandably, Figures 4 to 7 As shown, by providing 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 sensitivity and loudness of the sound-generating device 100 and enhancing the sound effect.

[0114] It should be noted that to further increase the total length of the voice coils 32, the number of voice coils 32 can be set to ≥ 2. On this basis, the annular magnetic circuit can be further designed to increase the magnet volume of the magnetic circuit system 2, thereby improving the BL value. It is understood that the number of voice coils 32 is consistent with the number of center magnets 221. When the number of voice coils 32 is N, and N ≥ 2, the number of center magnets 221 is N, and the number of shared magnets 223 is N-1.

[0115] It is understandable that 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 the external circuit through centering supports or conductive connectors or other methods, and multiple voice coils 32 can be connected in series or in parallel through structures such as wires or conductive supports, which are not limited here. Optionally, multiple voice coils 32 are connected in series. In this way, multiple voice coils 32 can be wound and formed using the same voice coil wire at the same time, so that multiple voice coils 32 are connected in series, which is not limited here. In this embodiment, if Figure 7 As shown, two voice coils 32 are connected in series.

[0116] In one embodiment, if Figures 1 to 6 As shown, the sound-generating device 100 further 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 connected to the vibration cavity or the back cavity, and the mesh 4 covers the vent holes. Thus, when the sound-generating device 100 is installed in a 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.

[0117] The present invention further provides an electronic device comprising the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is similar to that of the aforementioned embodiments. Since the present electronic device utilizes all the technical solutions of all the aforementioned embodiments, it at least has all the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and thus will not be described in detail here.

[0118] In one embodiment, the electronic device further includes a device housing and a flexible circuit board. The sound-generating device 100 is disposed in 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 supply.

[0119] It is understood that the flexible circuit board is used to connect the external circuit to the sound device 100. The flexible circuit board has inner pads and outer pads. The inner pads of the flexible circuit board are connected to the sound device 100, and the outer pads of the flexible circuit board are used to connect to external terminals.

[0120] 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 printed 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 printed circuit board may be entirely disposed within the cavity of the device housing, and this is not a limitation here.

[0121] It is understood that the electronic device may be a headset, a mobile phone, a computer, a tablet computer, a smart wearable device, etc., and is not limited here. In the electronic device, the sound-emitting device 100 may be assembled into the housing of the electronic device in a modular manner or in a single unit. The electronic device may be a mobile phone, an MP3 player, an MP4 player, a tablet computer, a laptop computer, a headset, a wearable device, etc., and no further examples are given here.

[0122] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: The sound-generating device comprises: a vibration system that vibrates in a first direction, the vibration system comprising a diaphragm assembly and a voice coil connected to the diaphragm assembly; and a magnetic circuit system, the magnetic circuit system being arranged relative to the diaphragm assembly, the magnetic circuit system comprising a magnetic yoke and a plurality of magnet assemblies connected to the magnetic yoke, the plurality of magnet assemblies being spaced apart to form a magnetic gap, the end of the voice coil remote from the diaphragm assembly being arranged relative to the magnetic gap, the plurality of magnet assemblies being made of neodymium iron boron material and integrally hot-pressed with the magnetic yoke; In which, the magnetic yoke is provided with a accommodating space, the magnet assembly includes a main body portion provided on the side of the magnetic yoke close to the diaphragm assembly and a protrusion extending into the accommodating space, the outer periphery of the protrusion is fitted with the inner wall of the accommodating space, the magnetic yoke includes a yoke plate opposite to the magnetic gap along the first direction, the outer periphery of the yoke plate is fitted with the side wall of the magnet assembly, the yoke plate has a first dimension L1 along the second direction and a second dimension L2 along the third direction, the first dimension L1 is smaller than the second dimension L2, the first direction, the second direction and the third direction are arranged perpendicular to each other, the thickness of the voice coil is defined as D, and the thickness D of the voice coil and the first dimension L1 satisfy: 0.1≤D / L1<1.

2. The sound-generating device according to claim 1, wherein: The plurality of magnet assemblies include a central magnet and side magnets, wherein the side magnets are located outside the central magnet and spaced apart from the central magnet to form the magnetic gap, and the outer peripheral wall of the yoke plate is respectively fitted with the side walls of the central magnet and the side magnets; Wherein, the central magnet includes the main body and the protrusion.

3. The sound-generating device according to claim 2, wherein: The side magnets form a closed integral ring structure and are arranged around the central magnet; Alternatively, the side magnets include a plurality of adjacent side magnets connected end to end to form a closed ring structure and arranged around the central magnet; Alternatively, the side magnets include a plurality of side magnets, and the plurality of side magnets are spaced apart and arranged around the central magnet, so that a first gap is formed between adjacent side magnets.

4. The sound-generating device according to claim 2, wherein: The magnetic circuit system further includes a magnetic conductive plate assembly, the magnetic conductive plate assembly including a central magnetic conductive plate and a side magnetic conductive plate, the central magnetic conductive plate is arranged on a side of the central magnet facing away from the magnetic conductive yoke, and the side magnetic conductive plate is arranged on a side of the side magnet facing away from the magnetic conductive yoke; The side magnetic conductive plates form a closed integral ring structure; or, the side magnetic conductive plates include a plurality of them, and adjacent side magnetic conductive plates are connected end to end to form a closed ring structure; or, the side magnetic conductive plates include a plurality of them, and the plurality of side magnetic conductive plates are spaced apart to form a second gap between adjacent side magnetic conductive plates; And / or, the side magnetic conductive plate is square, and four corners of the side magnetic conductive plate are respectively provided with sound-transmitting holes arranged opposite to the diaphragm assembly; And / or, a groove extending along the first direction is provided on a side of the side magnetic conductive plate facing away from the side magnet, and the groove is used to avoid the lead portion of the voice coil.

5. The sound-generating device according to claim 1, wherein: The voice coils include two, both of which are connected to the diaphragm assembly and are spaced apart along the second direction; The plurality of magnet assemblies include side magnets, a common magnet, and two center magnets, wherein the side magnets are located outside the center magnets and the common magnet, and the common magnet is located between the two center magnets. The two center magnets and the common magnet are spaced apart along the second direction so that each center magnet is spaced apart from the side magnets and the common magnet to form a magnetic gap, and each voice coil is correspondingly disposed in relation to a magnetic gap. Wherein, the common magnet and the two central magnets each include the main body and the protruding portion.

6. The sound-generating device according to claim 5, wherein: 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 a plurality of adjacent side magnets connected end to end to form a closed ring structure and are arranged around the central magnet and the common magnet; or, the side magnets include a plurality of adjacent side magnets, and the plurality of side magnets are 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 the third direction and is connected to the side magnet; wherein the side magnet and the common magnet are an integrally formed structure; And / or, the yoke plate includes a first yoke plate and a second yoke plate arranged opposite to the magnetic gap; wherein the outer peripheral wall of the first yoke plate is respectively fitted with the side walls of the central magnet and the side magnets, and the outer peripheral wall of the second yoke plate is respectively fitted with the side walls of the central magnet and the common magnet; And / or, the two voice coils are connected in series.

7. The sound-generating device according to claim 5, wherein: The magnetic circuit system further includes a magnetic conductive plate assembly, the magnetic conductive plate assembly including a side magnetic conductive plate, a common magnetic conductive plate, and two central magnetic conductive plates, each of the central magnetic conductive plates being disposed on a side of the central magnet facing away from the magnetic conductive yoke, the side magnetic conductive plates being disposed on a side of the side magnet facing away from the magnetic conductive yoke, and the common magnetic conductive plate being disposed on a side of the common magnet facing away from the magnetic conductive yoke; The side magnetic conductive plates form a closed integral ring structure; or, the side magnetic conductive plates include a plurality of them, and adjacent side magnetic conductive plates are connected end to end to form a closed ring structure; or, the side magnetic conductive plates include a plurality of them, and the plurality of side magnetic conductive plates are spaced apart to form a second gap between adjacent side magnetic conductive plates; And / or, the side magnetic conductive plate is square, and four corners of the side magnetic conductive plate are respectively provided with sound-transmitting holes arranged opposite to the diaphragm assembly; And / or, a groove extending along the first direction is provided on a side of the side magnetic conductive plate facing away from the side magnet, and the groove is used to avoid the lead portion of the voice coil; And / or, the common magnetic conductive plate extends along the third direction and is connected to the side magnetic conductive plates; wherein the side magnetic conductive plates and the common magnetic conductive plate are an integrally formed structure.

8. The sound-generating device according to claim 1, wherein: Along the first direction, the yoke plate is provided with a recessed groove corresponding to the magnetic gap, and the recessed groove is used to avoid the voice coil; And / or, the accommodating space is a groove structure provided on the side of the magnetic yoke facing the magnet assembly; or, the accommodating space is a through-hole structure passing through the magnetic yoke; or, the accommodating space passes through the magnetic yoke, and the side of the protrusion facing away from the main body is flush with the side of the magnetic yoke facing away from the magnet assembly.

9. The sound-generating device according to claim 1, wherein: The diaphragm assembly is provided with 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 electrically connected to the lead portion.

10. The sound-generating device according to claim 9, wherein: The diaphragm assembly includes a diaphragm and a dome, the diaphragm includes an inner ring portion, a folded ring portion arranged around the inner ring portion, and a fixed portion arranged around 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, and the voice coil is connected to the dome.

11. The sound generating device according to claim 10, wherein: The conductive layer extends from the inner ring portion to the fixed portion, the periphery of the spherical top is connected to the side of the inner ring portion facing the magnetic circuit system, the spherical top is provided with a via hole corresponding to the conductive layer, and the lead portion passes through the via hole to connect with the conductive layer; And / or, the dome is provided with a protrusion extending toward the magnetic circuit system, and the protrusion is connected to the voice coil; And / or, the sound-generating device further includes a shell, the outer periphery of the diaphragm assembly is connected to one end of the shell, and the magnetic circuit system is connected to the other end of the shell; wherein, the shell is provided with a conductive part, and the conductive layer is connected and conductive to the conductive part.

12. An electronic device, characterized in that: The electronic device includes the sound emitting device according to any one of claims 1 to 11.

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