Sound-generating devices and electronic equipment

Abstract

This invention discloses a sound-generating device and an electronic device, relating to the field of electroacoustic transduction technology. The sound-generating device's vibration system vibrates along a first direction. The vibration system includes a diaphragm assembly and a voice coil. The magnetic circuit system includes a magnetic yoke and multiple magnet assemblies connected to the magnetic yoke. All magnet assemblies are made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke. 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 to the sidewall of the magnet assembly. The yoke plate has a maximum dimension H1 along the first direction, and the magnet assembly has a maximum dimension H2 along the first direction. The maximum dimensions H2 and H1 satisfy: 2 ≤ H2 / H1 ≤ 10. This invention 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 device. Furthermore, it makes the magnetic circuit system structurally reliable, less prone to breakage, and improves the product's stability in use.

Description

Technical Field

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

[0002] In recent years, with the rapid development of 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. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-generating device and an electronic device. The invention aims 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. Furthermore, it makes the magnetic circuit system structurally reliable, less prone to breakage, and improves the stability of the product in use.

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

[0006] A vibration system, the vibration system vibrating along a first direction, the vibration system including a diaphragm assembly and a voice coil connected to the diaphragm assembly; and

[0007] A magnetic circuit system is disposed opposite to the diaphragm assembly. The magnetic circuit system includes a magnetic yoke and a plurality of magnet assemblies connected to the magnetic yoke. The plurality of magnet assemblies are spaced apart and form a magnetic gap. The end of the voice coil away from the diaphragm assembly is disposed opposite to the magnetic gap. The plurality of magnet assemblies are all made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke.

[0008] The magnetic yoke has a receiving space, and the magnet assembly includes a main body portion disposed on the side of the magnetic yoke near the diaphragm assembly and a protrusion portion extending into the receiving space. The outer periphery of the protrusion portion is fitted against the inner wall of the receiving 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 against the side wall of the magnet assembly. The yoke plate has a maximum dimension H1 along the first direction, and the magnet assembly has a maximum dimension H2 along the first direction. The maximum dimension H2 and the maximum dimension H1 satisfy: 2≤H2 / H1≤10.

[0009] In one embodiment, the plurality of magnet assemblies include 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, and the outer peripheral wall of the yoke plate being respectively fitted to the side walls of the central magnet and the side magnet;

[0010] The central magnet includes the main body and the protrusion.

[0011] In one embodiment, the side magnets form a closed, integral ring structure and are arranged around the central magnet;

[0012] 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;

[0013] 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.

[0014] 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.

[0015] 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.

[0016] And / or, the side magnetic plate is square, and the four corners of the side magnetic plate are respectively provided with sound-transmitting holes that are opposite to the diaphragm assembly;

[0017] 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.

[0018] In one embodiment, the voice coil includes two voice coils, both of which are connected to the diaphragm assembly and are spaced apart along a second direction, which is perpendicular to the first direction.

[0019] The plurality of magnet assemblies include a side magnet, a common magnet and two center magnets. The side magnets are located outside the center magnets and the common magnets. The common magnets are located between the two center magnets. The two center magnets and the common magnets are arranged at intervals along the second direction, such that each center magnet is spaced apart from the side magnets and the common magnets to form a magnetic gap. Each voice coil is correspondingly arranged with a magnetic gap.

[0020] The common magnet and the two central magnets each include the main body and the protrusion.

[0021] 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 them, 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 a plurality of them, with the plurality of 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.

[0022] And / or, the common magnet extends along a third direction and is connected to the side magnet, with the first direction, the second direction, and the third direction being arranged perpendicularly to each other; wherein, the side magnet and the common magnet are integrally formed.

[0023] And / or, the yoke plate includes a first yoke plate and a second yoke plate disposed opposite to the magnetic gap; wherein, 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;

[0024] And / or, the two voice coils are connected in series.

[0025] In one embodiment, the magnetic circuit system further includes a magnetic guide plate assembly, which includes a side magnetic guide plate, a common magnetic guide plate, and two central magnetic guide plates. Each central magnetic guide plate is disposed on the side of a central magnet facing away from the magnetic guide yoke. The side magnetic guide plate is 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.

[0026] 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.

[0027] And / or, the side magnetic plate is square, and the four corners of the side magnetic plate are respectively provided with sound-transmitting holes that are opposite to the diaphragm assembly;

[0028] And / or, the side magnetic plate is provided with a groove extending in 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;

[0029] And / or, the common magnetic conductive plate extends along a third direction and is connected to the side magnetic conductive plate, with the first direction, the second direction and the third direction being arranged perpendicularly to each other; wherein, the side magnetic conductive plate and the common magnetic conductive plate are integrally formed.

[0030] In one embodiment, along the first direction, the yoke plate is provided with a recessed groove corresponding to the magnetic gap, the recessed groove being used to avoid the voice coil;

[0031] 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.

[0032] In one embodiment, 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 electrically connected to the lead portion.

[0033] 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.

[0034] 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;

[0035] And / or, the dome is provided with a protrusion extending toward the magnetic circuit system, the protrusion being connected to the voice coil;

[0036] 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.

[0037] The present invention also proposes an electronic device, which includes the sound-generating device described above.

[0038] The sound-generating device of this invention arranges a vibration system and a magnetic circuit system opposite to each other. The magnetic circuit system consists of a magnetic yoke and multiple magnet assemblies connected to the magnetic yoke, with the magnet assemblies spaced apart to form a magnetic gap. The vibration system consists of a diaphragm assembly and a voice coil connected to the diaphragm assembly, with one end of the voice coil connected to the diaphragm assembly and the other end opposite to the magnetic gap. When current is passed through the voice coil, it converts electrical energy into mechanical energy within the magnetic gap formed by the magnetic circuit system, driving the voice coil to vibrate the diaphragm assembly, thereby generating sound. Furthermore, by providing a receiving space on the magnetic yoke, and by setting the magnet assembly as a main body located on the side of the magnetic yoke near the diaphragm assembly and a protrusion extending into the receiving space of the magnetic yoke, and by using neodymium iron boron material for the magnet assembly and integrally hot-pressing the magnet assembly with the magnetic yoke, the outer periphery of the protrusion of the magnet assembly is aligned with the receiving space of the magnetic yoke. The inner wall of the space is fitted together, allowing the magnet assembly and the magnetic yoke to be "zero-fit," 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 enables 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 device's sensitivity and loudness. It also makes the magnetic circuit system structurally reliable, less prone to breakage, and improves the product's stability in use. Furthermore, by setting a yoke plate on the magnetic yoke along the first direction opposite to the magnetic gap, the outer periphery of the yoke plate is fitted to the side wall of the magnet assembly. The maximum dimension H2 of the magnet assembly along the first direction and the maximum dimension H1 of the yoke plate along the first direction are set to satisfy: 2≤H2 / H1≤10. This allows the yoke plate to meet the magnetic focusing effect and magnetic conductivity required by the sound-generating device, and also meets the requirements of the thin and light design and acoustic performance of the sound-generating device. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0040] Figure 1 A schematic diagram of the structure of an embodiment of the sound-generating device provided by the present invention;

[0041] Figure 2 A cross-sectional schematic diagram of an embodiment of the sound-generating device provided by the present invention;

[0042] Figure 3 An exploded view of an embodiment of the sound-generating device provided by the present invention;

[0043] Figure 4 A schematic diagram of another embodiment of the sound-generating device provided by the present invention;

[0044] Figure 5 A cross-sectional schematic diagram of another embodiment of the sound-generating device provided by the present invention;

[0045] Figure 6 An exploded view of another embodiment of the sound-generating device provided by the present invention;

[0046] Figure 7 A schematic diagram of another embodiment of the vibration system provided by the present invention;

[0047] Figure 8 This is a schematic diagram of another embodiment of the diaphragm provided by the present invention.

[0048] Explanation of icon numbers:

[0049] 100. Sound-generating device; 1. Housing; 11. Conductive component; 2. Magnetic circuit system; 21. Magnetic yoke; 211. Receiving space; 214. Yoke plate; 215. Recessed groove; 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 plates; 23 21. 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. Hole; 312. Dome; 3121. Through hole; 3122. Protrusion; 32. Voice coil; 321. Lead wire part; 4. Mesh fabric.

[0050] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0052] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0053] 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.

[0054] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0055] This invention proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applied to electronic devices, which may be mobile phones, headphones, smart wearable devices, tablets, laptops, etc., and are not limited thereto.

[0056] Please refer to the reference. Figures 1 to 8 As shown, in this embodiment of the 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 disposed 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 spaced apart and form a magnetic gap 24. The end of the voice coil 32 away from the diaphragm assembly 31 is disposed opposite to the magnetic gap 24. The plurality of magnet assemblies 22 are all made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke 21.

[0057] In this embodiment, the sound-generating device 100 can be a single unit of a loudspeaker, and the loudspeaker can be a miniature loudspeaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 are arranged opposite to each other.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] In this embodiment, the magnetic yoke 21 is provided with a receiving space 211, and the magnet assembly 22 includes a main body 2211 disposed on the side of the magnetic yoke 21 near the diaphragm assembly 31 and a protrusion 2212 extending into the receiving space 211. The outer periphery of the protrusion 2212 is fitted to the inner wall of the receiving space 211.

[0067] Understandably, compared to normal assembly where assembly tolerances and material tolerances exist, especially at locations with rounded corners, the tolerances are generally larger. In this embodiment, as... Figure 2 , Figure 3, Figure 5 and Figure 6 As shown, by configuring 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 is provided with a receiving space 211, and the magnet assembly 22 is configured as a main body 2211 located on the side of the magnetic yoke 21 near the diaphragm assembly 31 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 hot-pressed and formed, so that the outer periphery of the protrusion 2212 of the magnet assembly 22 is fitted to the inner wall of the receiving space 211 of the magnetic yoke 21, that is, the magnet assembly 22 and the magnetic yoke 21 achieve "zero-fit", making The connection between the magnet assembly 22 and the magnetic yoke 21 is almost perfectly fitted, eliminating assembly tolerances and material tolerances. This allows for maximizing the volume of the magnet assembly 22. Moreover, compared to sintered NdFeB, hot-pressed NdFeB improves the mechanical strength of the magnet assembly 22 and makes it less prone to breakage. This enables the sound-generating 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's BL value, sound sensitivity, and loudness. Furthermore, it ensures the structural reliability of the magnetic circuit system 2, making it less prone to breakage. This not only improves the product's stability but also meets higher performance requirements, compensating for the performance loss caused by the thinner and lighter design of the sound-generating device 100.

[0068] In one embodiment, the magnetic yoke 21 includes a yoke plate 214 opposite to the magnetic gap 24 along a first direction, and the outer periphery of the yoke plate 214 is fitted to the sidewall of the magnet assembly 22. In this 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, wherein the maximum dimensions H2 and H1 satisfy: 2≤H2 / H1≤10.

[0069] Understandably, if the maximum dimension H1 of the yoke 214 is too small, it will affect the magnetic focusing effect and magnetic conductivity of the yoke 214; while if the maximum dimension H1 of the yoke 214 is too large, it will increase the weight of the magnetic circuit system 2, failing to meet the requirements of the slim design of the sound-generating device 100. Moreover, under the condition of the same product height, if the maximum dimension H1 of the 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.

[0070] In this embodiment, as Figure 2 and Figure 5As shown, by setting the ratio of the maximum size H2 of the magnet assembly 22 to the maximum size H1 of the yoke 214 within the range of 2 to 10, not only does the 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, it 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 size H2 of the magnet assembly 22 to the maximum size H1 of the yoke 214 can be selected as 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., and is not limited here.

[0071] The sound-generating device 100 of the present invention arranges a vibration system 3 and a magnetic circuit system 2 opposite to each other. The magnetic circuit system 2 is configured as a magnetic yoke 21 and a plurality of magnet assemblies 22 connected to the magnetic yoke 21, such that the plurality of magnet assemblies 22 are spaced apart to form a magnetic gap 24. The vibration system 3 is configured as a diaphragm assembly 31 and a voice coil 32 connected to the diaphragm assembly 31, such 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 opposite to the magnetic gap 24. In this way, current is passed through the voice coil 32, thereby causing the voice coil 32 to vibrate in the magnetic circuit. The magnetic gap 24 formed by system 2 converts electrical energy into mechanical energy to drive the voice coil 32 to vibrate the diaphragm assembly 31, thereby producing sound. Simultaneously, by providing a receiving space 211 in the magnetic yoke 21, and by configuring the magnet assembly 22 as a main body 2211 located on the side of the magnetic yoke 21 near 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 integrally hot-pressing the magnet assembly 22 with the magnetic yoke 21, the protrusion of the magnet assembly 22... The outer periphery of 2212 is fitted to the inner wall of the accommodating space 211 of the magnetic yoke 21, thereby achieving a "zero-fit" relationship between the magnet assembly 22 and the magnetic yoke 21. This maximizes the volume of the magnet assembly 22. 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 not only achieve an ultra-thin magnetic circuit design but also increase the magnet volume of the magnetic circuit system 2, thereby improving the sound-generating sensitivity and loudness of the sound-generating device 100. Furthermore, it ensures the structural reliability of the magnetic circuit system 2, making it less prone to breakage. To improve the stability of product use; furthermore, by setting a yoke plate 214 on the magnetic yoke 21 that is opposite to the magnetic gap 24 along the first direction, the outer periphery of the yoke plate 214 is fitted to the side wall of the magnet assembly 22, and the maximum dimension H2 of the magnet assembly 22 along the first direction and the maximum dimension H1 of the yoke plate 214 along the first direction satisfy: 2≤H2 / H1≤10. In this way, the yoke plate 214 meets the magnetic focusing effect and magnetic conductivity required by the sound generating device 100, and can also meet the requirements of the thin and light design and acoustic performance of the sound generating device 100.

[0072] 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 side of the magnetic yoke 21 facing the magnet assembly 22. 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 passes through the magnetic yoke 21.

[0073] In one embodiment, the receiving space 211 extends 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 is understood that, as Figure 2 and Figure 5 As shown, by aligning the side of the magnetic yoke 21 facing away from the magnet assembly 22 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.

[0074] In one embodiment, the yoke 214 has a first dimension L1 along a second direction and a second dimension L2 along a 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 perpendicularly 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: 0.1≤D / L1<1.

[0075] Understandable, such as Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the first dimension L1 of the yoke 214 is smaller than the second dimension L2. In this embodiment, the thickness of the voice coil 32 is defined as D, and the thickness D of the voice coil 32 and the first dimension L1 of the yoke 214 satisfy: 0.1 ≤ D / L1 < 1. It should be noted that the size of the first dimension L1 of the yoke 214 affects the magnetic focusing effect and magnetic permeability of the yoke 214. When L1 is too small, the magnetic focusing effect and magnetic permeability of the 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 yoke 214, as well as the thinness and high acoustic performance of the sound generating device 100 can be balanced.

[0076] 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 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 yoke plate 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).

[0077] In one embodiment, along the first direction, the yoke plate 214 has a recessed groove 215 corresponding to the magnetic gap 24, the recessed groove 215 being 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 yoke plate 214, interference between the voice coil 32 and the 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.

[0078] In one embodiment, the plurality of magnet assemblies 22 include 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. The outer peripheral wall of the yoke plate 214 is respectively attached to the side walls of the central magnet 221 and the side magnet 222. The central magnet 221 includes a main body portion 2211 and a protrusion portion 2212.

[0079] 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.

[0080] 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.

[0081] In this embodiment, as Figure 2As 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. 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 side of the magnetic yoke 21 facing away from the central magnet 221. Of course, in other embodiments, the side magnet 222 includes a main body 2211 and a protrusion 2212, which is not limited here.

[0082] Understandable, such as Figures 1 to 7 As shown, the vibration system 3 of the sound-generating device 100 vibrates along a first direction, that is, the magnetic circuit system 2 drives the voice coil 32 to reciprocate along the first direction. In this embodiment, along the first direction, the magnetic yoke 21 has a yoke plate 214 disposed opposite to the magnetic gap 24. Optionally, the outer peripheral wall of the yoke plate 214 is respectively fitted to the side walls of the central magnet 221 and the side magnet 222, so that the yoke plate 214 achieves "zero fit" with the central magnet 221 and the side magnet 222, 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 tolerance and material tolerance, thereby increasing the volume of the central magnet 221 and the side magnet 222 and improving the performance of the sound-generating device 100.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] Optionally, the side magnetic plate 232 and the side magnet 222 are set in a one-to-one correspondence, which is not limited here.

[0091] In one embodiment, the side magnetic plate 232 is square, and the four corners of the side magnetic plate 232 are respectively provided with sound transmission holes 2322 that are opposite to the diaphragm assembly 31.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] In one embodiment, the plurality of magnet assemblies 22 include a central magnet 221, a side magnet 222 and a common magnet 223, the side magnet 222 being located outside the central magnet 221 and the common magnet 223, and the central magnet 221 and the common magnet 223 being arranged at intervals along a second direction.

[0097] 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.

[0098] 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.

[0099] 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 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 correspondingly set with a magnetic gap 24, and each voice coil 32 is arranged around a central magnet 221.

[0100] 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.

[0101] 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.

[0102] In one implementation, such as Figures 5 to 7As shown, there are two voice coils 32, both of which are connected to the diaphragm assembly 31 and are spaced apart along a second direction, which is perpendicular to the first 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 outside the center magnets 221 and the common magnets 223, and the common magnets 223 are located between the two center magnets 221. The two center magnets 221 and the common magnets 223 are spaced apart along the second direction, so that each center magnet 221 is spaced apart from the side magnets 222 and the common magnets 223 to form a magnetic gap 24. Each voice coil 32 is correspondingly arranged with a magnetic gap 24.

[0103] 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.

[0104] Optionally, both the common magnet 223 and the two central magnets 221 include a main body 2211 and a protrusion 2212. In this embodiment, as... Figure 5 and Figure 6 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.

[0105] In one embodiment, the yoke 214 includes a first yoke and a second yoke disposed opposite to the magnetic gap 24; wherein the outer peripheral wall of the first yoke is respectively attached to the side wall of the central magnet 221 and the side magnet 222, and the outer peripheral wall of the second yoke is respectively attached to the side wall of the central magnet 221 and the common magnet 223.

[0106] Understandable, such as Figures 5 to 7 As 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 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 respectively provided corresponding to the two long sides or the two short sides of the magnetic gap 24; this is not limited here.

[0107] In this embodiment, as Figure 5As shown, the outer peripheral wall of the first yoke plate is respectively attached to the side wall of the central magnet 221 and the side magnet 222, and the outer peripheral wall of the second yoke plate is respectively attached to the side wall of the central magnet 221 and the common magnet 223.

[0108] Optionally, the first yoke and the second yoke 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 can be understood that the recessed grooves 215 provided by both the first yoke and the second yoke can prevent interference between the voice coil 32 and the first yoke and the second yoke in the vibration direction, thereby providing more space for the vibration of the voice coil 32 using the recessed grooves 215.

[0109] It should be noted that both the first yoke and the second yoke extend along a third direction, and are spaced apart along a second direction. In this embodiment, both the first yoke and the second yoke have a maximum dimension H1 along the first direction. Optionally, the maximum dimension H1 of the first yoke along the first direction is the same as the maximum dimension H1 of the second yoke along the first direction. It is understood that the maximum dimension H1 of the first yoke and the second yoke and the maximum dimension H2 of the magnet assembly 22 satisfy: 2≤H2 / H1≤10, which is not limited here.

[0110] It is understood that both the first yoke and the second yoke 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 and the second yoke are smaller than the second dimension L2. Optionally, the first dimension L1 of the first yoke is the same as the first dimension L1 of the second yoke, and the second dimension L2 of the first yoke is the same as the second dimension L2 of the second yoke. In this embodiment, the first dimension L1 of the first yoke and the second yoke and the thickness D of the voice coil 32 satisfy: 0.1 ≤ D / L1 < 1, which is not limited here.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] In one implementation, such as Figure 6 As shown, the common magnet 223 extends along a third direction and connects to the side magnet 222, with the first, second, and third directions arranged perpendicularly to each other. 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 is needed between the side magnet 222 and the common magnet 223, further increases the magnet volume, thereby improving the magnetic field strength.

[0115] In one embodiment, the magnetic circuit system 2 further includes a magnetic guide plate assembly 23, which includes a side magnetic guide plate 232, a common magnetic guide plate 233 and two central magnetic guide plates 231. Each central magnetic guide plate 231 is disposed on the side of a 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] Optionally, the side magnetic plate 232 and the side magnet 222 are set in a one-to-one correspondence, which is not limited here.

[0123] In one embodiment, the side magnetic plate 232 is square, and the four corners of the side magnetic plate 232 are respectively provided with sound transmission holes 2322 that are opposite to the diaphragm assembly 31.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] In one embodiment, the common magnetic conductive plate 233 extends along a third direction and connects to the side magnetic conductive plate 232, with the first direction, second direction, and third direction arranged perpendicularly to each other. 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.

[0129] In this embodiment, as 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 in the vibration system 3 is the same as the number of magnetic gaps 24 in the magnetic circuit system 2.

[0130] 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 electrically connected to the lead portion 321.

[0131] In this embodiment, as Figure 7 and Figure 8 As 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.

[0132] 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.

[0133] In this embodiment, as Figures 1 to 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] In this embodiment, as Figure 7 and Figure 8As 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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. In this embodiment, as... Figure 7 As shown, the two voice coils 32 are connected in series.

[0145] 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.

[0146] The present invention also proposes an electronic device including the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is as described in the foregoing embodiments. Since this electronic device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: A vibration system, the vibration system vibrating along a first direction, the vibration system including a diaphragm assembly and a voice coil connected to the diaphragm assembly; and A magnetic circuit system is disposed opposite to the diaphragm assembly. The magnetic circuit system includes a magnetic yoke and a plurality of magnet assemblies connected to the magnetic yoke. The plurality of magnet assemblies are spaced apart and form a magnetic gap. The end of the voice coil away from the diaphragm assembly is disposed opposite to the magnetic gap. The plurality of magnet assemblies are all made of neodymium iron boron material and are integrally hot-pressed with the magnetic yoke. The magnetic yoke has a receiving space, and the magnet assembly includes a main body portion disposed on the side of the magnetic yoke near the diaphragm assembly and a protrusion portion extending into the receiving space. The outer periphery of the protrusion portion is fitted against the inner wall of the receiving 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 against the side wall of the magnet assembly. The yoke plate has a maximum dimension H1 along the first direction, and the magnet assembly has a maximum dimension H2 along the first direction. The maximum dimension H2 and the maximum dimension H1 satisfy: 2≤H2 / H1≤10.

2. The sound-generating device as described in claim 1, characterized in that, The plurality of said magnet assemblies include a central magnet and a side magnet, the side magnets being 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 being respectively fitted to the side wall of the central magnet and the side magnet; The central magnet includes the main body and the protrusion.

3. The sound-generating device as described in claim 2, 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.

4. The sound-generating device as described in claim 2, 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 the four corners of the side magnetic plate are respectively provided with sound-transmitting holes that are opposite to the diaphragm assembly; 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.

5. The sound-generating device as described in claim 1, characterized in that, The voice coil includes two voice coils, both of which are connected to the diaphragm assembly and are arranged at intervals along a second direction, which is perpendicular to the first direction. The plurality of magnet assemblies include a side magnet, a common magnet and two center magnets. The side magnets are located outside the center magnets and the common magnets. The common magnets are located between the two center magnets. The two center magnets and the common magnets are arranged at intervals along the second direction, such that each center magnet is spaced apart from the side magnets and the common magnets to form a magnetic gap. Each voice coil is correspondingly arranged with a magnetic gap. The common magnet and the two central magnets each include the main body and the protrusion.

6. The sound-generating device as described in claim 5, characterized in that, The side magnets form a closed, integrated ring structure and are arranged around the central magnet and the common magnet; or, the side magnets include multiple side magnets, 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 side magnets, 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 and is connected to the side magnet, with the first direction, the second direction, and the third direction being arranged perpendicularly to each other; wherein, the side magnet and the common magnet are integrally formed. And / or, the yoke plate includes a first yoke plate and a second yoke plate disposed opposite to the magnetic gap; wherein, 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 two voice coils are connected in series.

7. The sound-generating device as described in claim 5, characterized in that, The magnetic circuit system further includes a magnetic guide plate assembly, which includes a side magnetic guide plate, a common magnetic guide plate, and two central magnetic guide plates. Each central magnetic guide plate is disposed on the side of a central magnet facing away from the magnetic guide yoke. The side magnetic guide plate is disposed on the side of the side magnet facing away from the magnetic guide yoke. The common magnetic guide plate is disposed 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 the four corners of the side magnetic plate are respectively provided with sound-transmitting holes that are opposite to the diaphragm assembly; And / or, the side magnetic plate is provided with a groove extending in 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; And / or, the common magnetic conductive plate extends along a third direction and is connected to the side magnetic conductive plate, with the first direction, the second direction and the third direction being arranged perpendicularly to each other; wherein, the side magnetic conductive plate and the common magnetic conductive plate are integrally formed.

8. The sound-generating device as claimed in claim 1, characterized in that, 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 as claimed in claim 1, characterized in that, 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 electrically connected to the lead portion.

10. The sound-generating device as claimed in claim 9, 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.

11. The sound-generating device as claimed in claim 10, 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.

12. An electronic device, characterized in that, The electronic device includes a sound-generating device as described in any one of claims 1 to 11.

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