Sound production module and electronic device

Abstract

The application discloses a sound production module and electronic equipment, the sound production module comprises a module shell and a sound production unit, the module shell is provided with a mounting cavity and a sound outlet hole communicating with the mounting cavity, a magnetic circuit system of the sound production unit comprises a magnetic yoke and two first magnetic circuit parts arranged on the magnetic yoke, the magnetic yoke has two long-axis sides and two short-axis sides connected in a head-to-tail mode, the two first magnetic circuit parts are arranged in a spaced mode along the extension direction of the long-axis sides, and a containing space is formed between the two first magnetic circuit parts, each first magnetic circuit part comprises a magnetic circuit assembly, a diaphragm of a vibration system is arranged in the containing space, each voice coil is arranged corresponding to the magnetic circuit assembly and is connected with the diaphragm through a skeleton; wherein, along the vibration direction of the diaphragm, the top surface of the diaphragm is lower than the top surfaces of the two first magnetic circuit parts, a front sound cavity is formed between the top surface of the diaphragm and the two first magnetic circuit parts, and the front sound cavity is communicated with the sound outlet hole. The sound production module of the application realizes thin design and has high mass production.

Description

Technical Field

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

[0002] The driver unit is a crucial electroacoustic transducer in consumer electronics, widely used in speakers, earpieces, and headphones. As electronic product performance improves, improvements in the acoustic performance of the driver unit are inevitable. To achieve better acoustic performance, drivers often require larger magnetic circuit systems with stronger magnetic fields.

[0003] However, as portable smart devices become increasingly thinner and lighter, especially foldable products, the demand for ultra-thin drivers in terminal devices is increasing. Drivers typically need to accommodate space for vibration and sound output channels, so when implementing ultra-thin module designs, the thickness of the miniature drivers within the module needs to be further reduced.

[0004] In related technologies, when reducing the thickness of a product, a larger vibration space needs to be reserved inside the product to maintain its EQ performance. Therefore, the magnets, magnetic plates, and yokes of the sound-generating unit must be thinned. However, excessively thin magnets have a high breakage rate during transportation, cleaning, and magnetization, leading to a sharp increase in material costs. At the same time, because the magnets, magnetic plates, and yokes are all thinned to varying degrees, the drop reliability and yield of the finished product are also significantly reduced, making mass production impossible. Summary of the Invention

[0005] The main objective of this invention is to provide a sound-generating module and an electronic device, which aims to provide a thin sound-generating module. This sound-generating module achieves thinness by maximizing the use of the thickness space of the sound-generating unit, and also effectively increases the thickness of the magnet in the sound-generating unit. It has high mass production capability. This sound-generating module does not require additional space reserved for the vibration of the sound-generating unit, which is conducive to further thinning of the whole module.

[0006] To achieve the above objectives, the present invention proposes a sound-generating module, the sound-generating module comprising:

[0007] Module housing, the module housing having a mounting cavity and a sound outlet communicating with the mounting cavity; and

[0008] A sound-generating unit is disposed in the mounting cavity. The sound-generating unit includes a magnetic circuit system and a vibration system. The magnetic circuit system includes a magnetic yoke and two first magnetic circuit portions disposed on the magnetic yoke. The magnetic yoke has two long axis sides and two short axis sides connected end to end. The two first magnetic circuit portions are arranged at intervals along the extension direction of the long axis sides, and a receiving space is formed between the two first magnetic circuit portions. Each first magnetic circuit portion includes a magnetic circuit assembly. The vibration system includes a diaphragm, a frame, and two first voice coils. The diaphragm is disposed in the receiving space. Each first voice coil is disposed corresponding to one of the magnetic circuit assemblies and is connected to the diaphragm through the frame.

[0009] Along the vibration direction of the diaphragm, the top surface of the diaphragm is lower than the top surfaces of the two first magnetic circuit portions, and a front acoustic cavity is formed between the top surface of the diaphragm and the two first magnetic circuit portions, and the front acoustic cavity is connected to the sound outlet.

[0010] In one embodiment, the sound outlet is located on the front side of the module housing and is positioned directly opposite the diaphragm;

[0011] Alternatively, the sound outlet is located on the side of the module housing, and the top surface of the edge of the diaphragm extending along the arrangement direction of the two first magnetic circuit portions forms a sound outlet channel between the two first magnetic circuit portions, and the front acoustic cavity communicates with the sound outlet through the sound outlet channel.

[0012] In one embodiment, the module housing is further provided with a fixing hole corresponding to at least one of the first magnetic circuit portions, and at least a portion of the first magnetic circuit portion is located within the fixing hole to seal the fixing hole.

[0013] In one embodiment, each of the first magnetic circuit portions further includes a cover, each cover being disposed on the side of a magnetic circuit assembly away from the magnetic yoke and connected to the magnetic yoke and / or the magnetic circuit assembly, with at least a portion of the cover located within the fixing hole to seal the fixing hole.

[0014] In one embodiment, the cover is made of a magnetically conductive material;

[0015] And / or, the periphery of the cover extends toward the receiving space to form an extension, the two edges of the diaphragm located in the arrangement direction of the two magnetic circuit components are connected to the extension, and the front acoustic cavity is formed between the two covers, the diaphragm and the module housing;

[0016] And / or, the side of the cover facing away from the magnetic yoke is flush with the outer surface of the module housing;

[0017] And / or, the cover includes a top plate and a surrounding plate disposed around the top plate, the surrounding plate and the top plate forming a cavity, at least a portion of the magnetic circuit assembly being housed within the cavity and connected to the top plate, the surrounding plate being connected to the magnetic yoke.

[0018] In one embodiment, the module housing has a mounting hole corresponding to the magnetic yoke, and at least a portion of the magnetic yoke is located within the mounting hole to seal the mounting hole.

[0019] In one embodiment, the outer surface of the magnetic yoke is flush with the outer surface of the module housing.

[0020] In one embodiment, the magnetic yoke includes a bottom wall and a side wall arranged at an angle, the side wall and the bottom wall enclosing a cavity;

[0021] The magnetic yoke also includes two side plates located within the cavity, the two side plates being spaced apart from the bottom wall, the accommodating space being located between the two side plates, the side of each side plate facing away from the accommodating space being enclosed by the side wall to form an accommodating space, each magnetic circuit assembly being disposed within one of the accommodating spaces and spaced apart from the side wall and the side plates to form a first magnetic gap, and one end of the first voice coil being suspended in the first magnetic gap.

[0022] In one embodiment, the bottom wall, the side plate, and the side wall are integrally formed.

[0023] And / or, the magnetic yoke is further provided with a leakage hole communicating with the cavity, the leakage hole including a plurality of holes, the plurality of leakage holes being spaced apart on the side wall;

[0024] And / or, the bottom wall is provided with a through hole through the bottom wall adjacent to each of the side plates, and each of the side plates is bent into shape from the side of the bottom wall adjacent to the through hole toward the cavity, and the sound-emitting unit also includes a cover plate, which covers the through hole;

[0025] And / or, the two edges of the diaphragm extending along the arrangement direction of the two first magnetic circuit portions are connected to the sidewall.

[0026] In one embodiment, each of the magnetic circuit components includes at least two first magnets and at least one first magnetic plate. The at least two first magnets are stacked on the magnetic yoke along the vibration direction of the diaphragm, and the first magnetic plate is sandwiched between two adjacent first magnets. Furthermore, the first magnets are all magnetized along the vibration direction of the diaphragm, and the magnetization directions of two adjacent first magnets located on both sides of the first magnetic plate are opposite.

[0027] And / or, along the vibration direction of the diaphragm, the height of the sound-generating unit is approximately equal to the height of the sound-generating module.

[0028] In one embodiment, the diaphragm includes a central portion, a folded ring portion surrounding the central portion, and a fixing portion disposed outside the folded ring portion. The fixing portion is connected to the magnetic circuit system. The central portion is provided with a hollow hole. The vibration system also includes a dome, and the dome is disposed at the hollow hole.

[0029] And / or, the frame includes a first support portion, a first connecting portion and a second support portion connected together, the first support portion being connected to the central portion of the diaphragm, and the second support portion being connected to the first voice coil;

[0030] And / or, the vibration system further includes a centering support, which includes an outer fixing part, an inner fixing part, and a spring arm part connecting the outer fixing part and the inner fixing part. The outer fixing part is connected to the magnetic yoke, the inner fixing part is connected to the frame, and is electrically connected to the first voice coil.

[0031] In one embodiment, the magnetic circuit system further includes a central magnetic circuit, which is disposed in the receiving space and is positioned opposite and spaced apart from the diaphragm along the vibration direction of the diaphragm;

[0032] The vibration system also includes a central voice coil, which is arranged corresponding to the central magnetic circuit, and one end of the central voice coil is connected to the diaphragm.

[0033] In one embodiment, the central magnetic circuit is disposed on the magnetically conductive yoke, and the central magnetic circuit includes a central magnet and a central magnetically conductive plate stacked together, with the central magnet sandwiched between the magnetically conductive yoke and the central magnetically conductive plate; the magnetically conductive yoke and / or the central magnetically conductive plate are provided with an opening, and the central magnet is provided with a protrusion corresponding to the opening, the protrusion being confined within the opening;

[0034] And / or, the magnetic yoke further includes a plurality of upright plates, which are spaced apart within the receiving space. The central magnetic circuit is located between the plurality of upright plates and spaced apart from the upright plates to form a central magnetic gap. One end of the central voice coil is suspended in the central magnetic gap.

[0035] And / or, along the vibration direction of the diaphragm, the thickness of the central magnetic circuit is less than or equal to 1 / 2 of the thickness of the magnetic circuit system.

[0036] The present invention also proposes an electronic device, which includes the sound-generating module described above.

[0037] The sound-generating module of this invention utilizes an installation cavity and a sound outlet connecting the installation cavity within the module housing to mount and fix the sound-generating unit. The magnetic circuit system of the sound-generating unit is configured as a magnetic yoke and two first magnetic circuit sections, spaced apart and connected to the magnetic yoke to form a receiving space between them. Each first magnetic circuit section includes a magnetic circuit assembly. This receiving space provides mounting and vibration space for the diaphragm of the vibration system, ensuring that the projections of the diaphragm and the two first magnetic circuit sections in the vibration direction of the diaphragm do not overlap. This provides sufficient vibration space for the diaphragm without affecting the thickness of the magnetic circuit assembly of the first magnetic circuit section in the vibration direction of the diaphragm, and even increases the thickness of the magnetic circuit assembly in the vibration direction of the diaphragm. Furthermore, along the vibration direction of the diaphragm, the top surface of the diaphragm is lower than the top surfaces of the two first magnetic circuit sections, forming a front acoustic cavity between the top surface of the diaphragm and the two first magnetic circuit sections. This front acoustic cavity connects to the sound outlet, ensuring the sound output of the sound-generating unit. Compared to traditional drivers where the diaphragm and magnetic circuit are arranged vertically, this design effectively reduces the thickness of the driver in the diaphragm vibration direction, enabling a thinner driver module design. This eliminates the need for additional space for driver vibration, further reducing the overall module's thickness. Simultaneously, by using two first voice coils corresponding to the magnetic circuit components of the two first magnetic circuit sections, and connecting the two voice coils to the diaphragm via a frame, the magnetic circuit components of the two first magnetic circuit sections provide larger magnetic circuits for each voice coil, increasing the black-white (BL) value. Furthermore, these components effectively increase the heat dissipation area, improving heat dissipation during driver operation. Finally, by setting the magnetic yoke as a rectangular integrated structure, the structural strength of the magnetic circuit system is enhanced, ensuring the installation and positioning of the magnetic circuit components and the two voice coils. This guarantees the consistency and vibration effect of the diaphragm as it vibrates with the two voice coils, thereby improving the driver's sound performance and acoustic properties. Attached Figure Description

[0038] 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.

[0039] Figure 1 This is a schematic diagram of the structure of a sound-generating module in one embodiment of the present invention;

[0040] Figure 2 This is a cross-sectional schematic diagram of a sound-generating module in one embodiment of the present invention;

[0041] Figure 3 This is a cross-sectional view of the sound-generating module in another direction according to one embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of the sound-generating module in another embodiment of the present invention;

[0043] Figure 5 This is a cross-sectional schematic diagram of the sound-generating module in another embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of the structure of a sound-generating unit in one embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of the structure of the sound-generating unit from another perspective in one embodiment of the present invention;

[0046] Figure 8 This is a cross-sectional schematic diagram of a sound-generating unit in one embodiment of the present invention;

[0047] Figure 9 This is an exploded view of a sound-emitting unit in one embodiment of the present invention;

[0048] Figure 10 This is a top view of the sound-generating unit without its two covers in one embodiment of the present invention;

[0049] Figure 11 This is a schematic diagram of the current flow structure of the centering support and two first voice coils connected in series in one embodiment of the present invention;

[0050] Figure 12 This is an exploded view of the sound-generating unit in another embodiment of the present invention;

[0051] Figure 13 This is a cross-sectional schematic diagram of the sound-emitting unit in another embodiment of the present invention;

[0052] Figure 14 This is a schematic diagram of the current flow structure of the centering support plate connected in series with two first voice coils and a center voice coil in another embodiment of the present invention;

[0053] Figure 15 This is a schematic diagram of the structure of a magnetically conductive yoke in one embodiment of the present invention;

[0054] Figure 16 This is a schematic diagram of the structure of the magnetic yoke in another embodiment of the present invention;

[0055] Figure 17 This is a schematic diagram of the diaphragm structure in one embodiment of the present invention;

[0056] Figure 18 This is a schematic diagram of the centering support plate in one embodiment of the present invention;

[0057] Figure 19 This is a schematic diagram of the centering support plate in another embodiment of the present invention.

[0058] Explanation of icon numbers:

[0059] 100 Voice generator 1233 cavity 221 First Support Section 1 Magnetic circuit system 1234 extension 222 First connecting part 11 Magnetic yoke 13 First magnetic gap 223 Second support section 111 bottom wall 14 Central magnetic circuit 224 Avoidance area 1111 Limiting groove 141 Central magnet 226 support platform 1112 Through hole 1411 First surface 23 First voice coil 1113 Long axis 1412 Protrusion 24 center voice coil 1114 short axis 142 Central magnetic plate 25 De-settling support 112 sidewall 15 Opening 251 External fixation 113 cavity 16 Central magnetic gap 252 spring arm 114 Side panel 2 Vibration system 253 Internal fixation 1141 storage space 21 diaphragm 256 corner 1142 Leakage hole 211 Central Department 300 Module housing 1143 Avoiding gaps 2111 Hollow hole 310 Mounting cavity 115 cover plate 212 Ring part 311 Sound hole 116 uprights 213 Fixing part 320 Anterior vocal cavity 117 storage space 214 Bending section 330 Rear vocal cavity 12 First magnetic circuit section 215 Top of the ball 340 front 121 Magnetic circuit components 2151 protrusion 350 side 1211 First magnet 2152 edge 360 Fixing hole 1212 First magnetic plate 216 First side 370 Mounting holes 123 Cover 217 Second side 400 Sound module 1231 roof 218 Sound channel 1232 Enclosure 22 skeleton

[0060] 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

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] The driver unit is a crucial electroacoustic transducer in consumer electronics, widely used in speakers, earpieces, and headphones. As electronic product performance improves, improvements in the acoustic performance of the driver unit are inevitable. To achieve better acoustic performance, drivers often require larger magnetic circuit systems with stronger magnetic fields.

[0066] However, as portable smart devices become increasingly thinner and lighter, especially foldable products, the demand for ultra-thin drivers in terminal devices is increasing. In related technologies, the magnetic circuit system in the driver is generally positioned opposite or directly opposite the diaphragm, meaning the diaphragm and magnetic circuit system are vertically aligned in the diaphragm's vibration direction. When applying the driver to a module, the module needs to reserve space for the upper vibration of the vibration system and the sound outlet channel. Therefore, when achieving an ultra-thin module design, the thickness of the miniature driver within the module needs to be further reduced.

[0067] When reducing the thickness of the product, a larger vibration space needs to be reserved inside the module to maintain the product's EQ performance. Therefore, the magnets, magnetic plates, and yokes of the sound-generating unit must be thinned. However, excessively thin magnets have a high breakage rate during transportation, cleaning, and magnetization, leading to a sharp increase in material costs. At the same time, because the magnets, magnetic plates, and yokes are all thinned to varying degrees, the drop reliability and yield of the finished product will also be significantly reduced, making mass production impossible.

[0068] Based on the above concepts and problems, the present invention proposes a sound-generating module 400. In this embodiment, the sound-generating unit 100 of the sound-generating module 400 has two first magnetic circuit parts 12 disposed at both ends of the sound-generating unit 100, so that a receiving space 117 is formed between the two first magnetic circuit parts 12. The receiving space 117 is used to provide installation and vibration space for the diaphragm 21 of the vibration system 2. Each first voice coil 23 is correspondingly disposed with the magnetic circuit assembly 121 of each first magnetic circuit part 12 and is connected to the diaphragm 21 through the frame 22. In this way, in the vibration direction of the diaphragm 21, that is, in the thickness direction of the sound-generating unit 100, the magnetic circuit system 1 and the diaphragm 21 are arranged horizontally, rather than vertically, reducing the thickness of the sound-generating unit 100 and maximizing the utilization of the product thickness space.

[0069] Meanwhile, since the diaphragm 21 vibrates inside the accommodating space 117, the sound-generating module 400 does not need to reserve additional vibration space, which is conducive to further thinning of the sound-generating module 400 and the whole machine. Moreover, the two first magnetic circuit parts 12 are located on both sides of the diaphragm 21, not opposite or directly opposite the diaphragm 21, which makes the thickness of the first magnet 1211 of the two first magnetic circuit parts 12 significantly increased compared with the conventional structure, resulting in higher mass production capability. Furthermore, the two first magnetic circuit parts 12 can effectively increase the heat dissipation area, which is beneficial to the heat dissipation of the sound-generating unit 100 during operation.

[0070] Understandably, the sound module 400 is used in electronic devices, such as smartwatches, mobile phones, speakers, computers, headphones, or televisions, etc., without any specific restrictions.

[0071] Please refer to the reference. Figures 1 to 19As shown, in this embodiment of the invention, the sound-generating module 400 includes a module housing 300 and a sound-generating unit 100. The module housing 300 has a mounting cavity 310 and a sound outlet 311 communicating with the mounting cavity 310. The sound-generating unit 100 is disposed in the mounting cavity 310. The sound-generating unit 100 includes a magnetic circuit system 1 and a vibration system 2. The magnetic circuit system 1 includes a magnetic yoke 11 and two first magnetic circuit portions 12 disposed on the magnetic yoke 11. The magnetic yoke 11 has two long axis sides 1113 and two short axis sides 1114 connected end to end. The two first magnetic circuit portions 12 are arranged at intervals along the extending direction of the long axis side 1113. A receiving space 117 is formed between the first magnetic circuit parts 12. Each first magnetic circuit part 12 includes a magnetic circuit assembly 121. The vibration system 2 includes a diaphragm 21, a frame 22 and two first voice coils 23. The diaphragm 21 is disposed in the receiving space 117. Each first voice coil 23 is disposed corresponding to a magnetic circuit assembly 121 and is connected to the diaphragm 21 through the frame 22. Along the vibration direction of the diaphragm 21, the top surface of the diaphragm 21 is lower than the top surface of the two first magnetic circuit parts 12. A front acoustic cavity 320 is formed between the top surface of the diaphragm 21 and the two first magnetic circuit parts 12. The front acoustic cavity 320 is connected to the sound outlet 311.

[0072] In this embodiment, the module housing 300 is provided with a mounting cavity 310 and a sound outlet 311 communicating with the mounting cavity 310. The sound-generating unit 100 is disposed in the mounting cavity 310. A front sound cavity 320 is formed between the top surface of the diaphragm 21 and the two first magnetic circuit portions 12. The front sound cavity 320 is communicating with the sound outlet 311.

[0073] In this embodiment, the sound-emitting unit 100 is a miniature loudspeaker. Optionally, the sound-emitting unit 100 is square in shape. Understandably, the magnetic circuit assembly 121 has a first magnetic gap 13. The magnetic circuit assembly 121 includes an inner magnetic part and an outer magnetic part, which are spaced apart and form a first magnetic gap between them; or the first magnetic gap is formed between the magnetic circuit assembly 121 and the magnetic yoke 11. This can be because the magnetic yoke 11 has a bent portion that bends toward the magnetic circuit assembly 121, and the bent portion forms a first magnetic gap with the magnetic circuit assembly 121, etc. The first voice coil 23 is disposed in the first magnetic gap and is connected to the diaphragm 21 through the frame 22, thereby driving the diaphragm 21 to vibrate and produce sound.

[0074] In one embodiment, the diaphragm 21 of the sound-generating unit 100 is arranged corresponding to the sound outlet 311, and the sound-generating module 400 has a positive sound outlet structure.

[0075] In another embodiment, the sound outlet 311 is located on the side 350 of the module housing 300. The top surface of the edge of the diaphragm 21 extending along the arrangement direction of the two first magnetic circuit portions 12 forms a sound outlet channel 218 between the two first magnetic circuit portions 12. The sound outlet 311 and the front sound cavity 320 are connected through the sound outlet channel 218. Furthermore, the module housing 300 is also provided with a sound outlet channel connecting the mounting cavity 310. The front sound cavity 320 is connected to the sound outlet 311 through the sound outlet channel. In this case, the sound-emitting module 400 has a side-emitting structure.

[0076] The sound-generating module 400 of the present invention provides a mounting cavity 310 and a sound outlet 311 communicating with the mounting cavity 310 within the module housing 300. This allows for the mounting and fixing of the sound-generating unit 100 within the mounting cavity 310. The magnetic circuit system 1 of the sound-generating unit 100 is configured as a magnetic yoke 11 and two first magnetic circuit portions 12, spaced apart and connected to the magnetic yoke 11, forming a receiving space 117 between the two first magnetic circuit portions 12. Each first magnetic circuit portion 12 includes a magnetic circuit assembly 121, thereby utilizing the receiving space 117 as the diaphragm of the vibration system 1. 21 provides installation and vibration space, ensuring that the projections of the diaphragm 21 and the two first magnetic circuit portions 12 in the vibration direction of the diaphragm 21 do not coincide. This provides the diaphragm 21 with sufficient vibration space and increases the thickness of the magnetic circuit assembly 121 of the first magnetic circuit portion 12 in the vibration direction of the diaphragm 21. Furthermore, along the vibration direction of the diaphragm 21, the top surface of the diaphragm 21 is lower than the top surfaces of the two first magnetic circuit portions 12, forming a front acoustic cavity 320 between the top surface of the diaphragm 21 and the two first magnetic circuit portions 12. The front acoustic cavity 320 communicates with the sound outlet 311, thereby ensuring the sound output of the sound-generating unit 100 is consistent with... Compared to the traditional method where the diaphragm and magnetic circuit are arranged vertically in a single unit, this design effectively reduces the thickness of the sound-generating unit 100 in the vibration direction of the diaphragm 21, thereby achieving a thinner design for the sound-generating module 400. This eliminates the need for additional space to accommodate the vibration of the sound-generating unit 100, further contributing to a thinner overall module. Simultaneously, by using two first voice coils 23 corresponding to the magnetic circuit components 121 of the two first magnetic circuit sections 12, and connecting the two first voice coils 23 to the diaphragm 21 via the frame 22, the magnetic circuit components 121 of the two first magnetic circuit sections 12 can be used to achieve a thinner design. The magnetic circuits of the two first voice coils 23 are provided with larger magnetic circuits, which increases the BL value. The magnetic circuit components 121 of the two first magnetic circuit sections 12 can effectively increase the heat dissipation area, which is beneficial to the heat dissipation of the sound-generating unit 100 during operation. Furthermore, by setting the magnetic yoke 11 as an integral structure with a rectangular arrangement, the structural strength of the magnetic circuit system 1 is enhanced, ensuring the installation and positioning of the magnetic circuit components 121 of the two first magnetic circuit sections 12 and the two first voice coils 23. This ensures the consistency and vibration effect of the diaphragm 21 as it vibrates with the two first voice coils 23, thereby improving the sound production effect and acoustic performance of the sound-generating unit 100.

[0077] In this embodiment, as Figure 2 , Figure 3 , Figure 5 As shown, the sound-generating unit 100 is disposed in the mounting cavity 310, and the two first magnetic circuit portions 12 of the sound-generating unit 100 and the cavity wall of the mounting cavity 310 enclose each other to form a front sound cavity 320 facing the diaphragm 21. The front sound cavity 320 is connected to the sound outlet channel 218.

[0078] In one embodiment, the sound outlet 311 is located on the front side 340 of the module housing 300 and is positioned directly opposite the diaphragm 21.

[0079] Understandably, the module housing 300 has a front surface 340 opposite to the diaphragm 21, and the sound outlet 311 is located on the front surface 340 and is directly opposite to the diaphragm 21. At this time, the sound-emitting module 400 has a positive sound-emitting structure.

[0080] In another embodiment, the sound outlet 311 is provided on the side 350 of the module housing 300, and the top edge of the diaphragm 21 extending along the arrangement direction of the two first magnetic circuit portions 12 forms a sound outlet channel 218 between the two first magnetic circuit portions 12, and the front sound cavity 320 is connected to the sound outlet 311 through the sound outlet channel 218.

[0081] Understandably, the module housing 300 has a side surface 350 located on one side of the sound-emitting unit 100, and a sound outlet 311 is located on the side surface 350. The module housing 300 also has a sound outlet channel connecting the sound outlet 311 and the front sound cavity 320. The front sound cavity 320 is connected to the sound outlet 311 through the sound outlet channel 218 and the sound outlet channel. Understandably, the sound-emitting module 400 has a side-emitting structure at this time.

[0082] It should be noted that the sound-generating module 400 also includes a flexible circuit board, at least one end of which is connected to the sound-generating unit 100 and is located within the mounting cavity 310 of the module housing 300. Of course, in other embodiments, the flexible circuit board may also be entirely disposed within the mounting cavity 310 of the module housing 300, which is not limited here.

[0083] In one embodiment, the module housing 300 is further provided with a fixing hole 360 ​​corresponding to at least one first magnetic circuit portion 12, and at least a portion of the first magnetic circuit portion 12 is located within the fixing hole 360 ​​to seal the fixing hole 360.

[0084] In this embodiment, as Figure 1 , Figure 2 and Figure 5As shown, by providing fixing holes 360 in the module housing 300, at least a portion of the first magnetic circuit portion 12 is located within the fixing holes 360 to seal the fixing holes 360, thereby effectively reducing the thickness or height of the sound-generating module 400. In this embodiment, the module housing 300 is provided with fixing holes 360 corresponding to each first magnetic circuit portion 12, and each first magnetic circuit portion 12 is located within the fixing holes 360 to seal the fixing holes 360.

[0085] Understandably, at least part of the first magnetic circuit portion 12 is located within the fixing hole 360 ​​to seal the fixing hole 360, so that the two first magnetic circuit portions 12 and the diaphragm 21 are enclosed with the module housing 300 to form the front acoustic cavity 320.

[0086] In one embodiment, each first magnetic circuit portion 12 further includes a cover 123, each cover 123 being disposed on the side of a magnetic circuit assembly 121 away from the magnetic yoke 11 and connected to the magnetic yoke 11 and / or the magnetic circuit assembly 121, with at least a portion of the cover 123 located within the fixing hole 360 ​​to seal the fixing hole 360.

[0087] In this embodiment, the top plate 1231 of the cover 123 of the first magnetic circuit portion 12 is exposed through the fixing hole 360, and the inner wall of the fixing hole 360 ​​is sealed to the outer wall of the surrounding plate 1232 of the cover 123. Optionally, the cover 123 of the first magnetic circuit portion 12 is connected and fixed to the module housing 300 by adhesive.

[0088] Optionally, the side of the first magnetic circuit portion 12 facing away from the guide yoke 11 is flush with the outer surface of the module housing 300. In this embodiment, the top plate 1231 of the cover 123 of the first magnetic circuit portion 12 is flush with the side of the guide yoke 11 facing away from the module housing 300, which effectively ensures that the thickness or height of the sound-generating module 400 is consistent.

[0089] In one embodiment, the module housing 300 is provided with a mounting hole 370 corresponding to the magnetic yoke 11, and at least part of the magnetic yoke 11 is located within the mounting hole 370 to seal the mounting hole 370.

[0090] Understandable, such as Figures 2 to 5 As shown, by providing mounting holes 370 in the module housing 300, at least a portion of the magnetic yoke 11 is located within the mounting holes 370 to seal the mounting holes 370, thus effectively reducing the thickness or height of the sound-generating module 400. Optionally, the outer surface of the magnetic yoke 11 is flush with the outer surface of the module housing 300, that is, the side of the magnetic yoke 11 facing away from the diaphragm 21 is flush with the outer surface of the module housing 300. This arrangement effectively ensures that the thickness or height of the sound-generating module 400 is consistent.

[0091] It should be noted that by providing fixing holes 360 and mounting holes 370 on opposite sides of the module housing 300, the top plate 1231 of the cover 123 of the first magnetic circuit part 12 of the sound-generating unit 100 is exposed in the fixing holes 360 and is flush with the outer surface of the module housing 300. The magnetic yoke 11 is exposed in the mounting holes 370 and is flush with the outer surface of the module housing 300. This makes the height of the sound-generating module 400 equivalent to or the same as the height of the sound-generating unit 100, thereby effectively achieving the thin design of the sound-generating module 400.

[0092] In this embodiment, the magnetic yoke 11 of the sound-generating unit 100 is provided with a leakage hole 1142. It is understood that when the sound-generating unit 100 is disposed within the mounting cavity 310, the leakage hole 1142 of the sound-generating unit 100 connects the mounting cavity 310 and the receiving cavity 113. It is also understood that a rear acoustic cavity 330, isolated from the front acoustic cavity 320, is formed between the sound-generating unit 100 and the module housing, and the leakage hole 1142 of the sound-generating unit 100 connects to the rear acoustic cavity 330.

[0093] To further improve the sound output performance of the sound-generating module 400, the rear acoustic cavity 330 of the sound-generating module 400 is filled with sound-absorbing particles. To prevent these sound-absorbing particles from entering the sound-generating unit 100 through the leakage hole 1142 and affecting the sound-generating unit 100, it is understandable that the sound-generating module 400 may also have insulating mesh or metal mesh installed within the rear acoustic cavity 330, so that the insulating mesh or metal mesh covers the leakage hole 1142 of the sound-generating unit 100.

[0094] In this embodiment, as Figure 4 As shown, the module housing 300 is also provided with a damping hole that connects to the rear acoustic cavity 330, and a damping component is provided at the damping hole to block the damping hole. This allows sound-absorbing particles to be easily filled from the damping hole into the rear acoustic cavity 330, which is not limited here.

[0095] Understandably, the direction of vibration of the diaphragm 21 is defined as the first direction, the arrangement direction of the two first magnetic circuit portions 12 is defined as the second direction, and the third direction is arranged perpendicular to both the first and second directions. In this embodiment, the two first magnetic circuit portions 12 are arranged at intervals along the second direction, that is, the two first magnetic circuit portions 12 and the diaphragm 21 are arranged sequentially along the second direction, and the two first voice coils 23 are arranged at intervals along the second direction, with each first voice coil 23 corresponding to a magnetic circuit assembly 121 of a first magnetic circuit portion 12. Optionally, each first voice coil 23 extends along the third direction.

[0096] It should be noted that by placing the two first magnetic circuit portions 12 on both sides of the diaphragm 21, that is, by placing the two first magnetic circuit portions 12 and the diaphragm 21 in a left-right arrangement rather than vertically in the vibration direction of the diaphragm 21, that is, by arranging the two first magnetic circuit portions 12 and the diaphragm 21 sequentially in a direction perpendicular to the vibration of the diaphragm 21, the first magnetic circuit portions 12 are not opposite to the diaphragm 21. This allows the accommodating space 117 to provide sufficient vibration space for the diaphragm 21. Since the first magnetic circuit portions 12 are not opposite to the diaphragm 21, there is no need to reserve vibration space for the diaphragm 21. This effectively increases the thickness of the first magnetic circuit portions 12 in the vibration direction of the diaphragm 21. Compared with the magnetic circuit system opposite to the diaphragm 21 in a traditional sound-generating unit, the thickness of the first magnetic circuit portions 12 in the vibration direction of the diaphragm 21 is effectively increased, thereby effectively improving the magnetic field performance and strength, and thus improving the BL value and acoustic performance of the sound-generating unit 100.

[0097] Optionally, the opposite sides of the diaphragm 21 can be fixedly connected to the two first magnetic circuit portions 12 to achieve installation and fixation.

[0098] Understandably, each first magnetic circuit section 12 includes a magnetic circuit component 121, and each first voice coil 23 is set corresponding to a magnetic circuit component 121 and connected to the diaphragm 21 through the skeleton 22. That is, each of the two first voice coils 23 corresponds to each of the two magnetic circuit components 121 in the two first magnetic circuit sections 12 and is connected to the diaphragm 21 through the skeleton 22. In other words, the two first voice coils 23 are connected to both sides of the diaphragm 21 through the skeleton 22 respectively. In this way, the two first voice coils 23 drive the diaphragm 21 to vibrate and produce sound under the action of the magnetic field of the two first magnetic circuit sections 12, effectively improving the driving force, thereby improving the BL value and acoustic performance of the sound-producing unit 100.

[0099] In this embodiment, the magnetic yoke 11 can be an integrally molded structure, which ensures the consistent installation of the two first magnetic circuit parts 12 on the magnetic yoke 11, thereby ensuring the synchronicity of the vibration of both sides of the diaphragm 21 with the two first voice coils 23. It should be noted that the magnetic yoke 11 is square in shape. Optionally, the magnetic yoke 11 is rectangular in shape, that is, the magnetic yoke 11 has two long axis sides 1113 and two short axis sides 1114 connected end to end. Optionally, the two first magnetic circuit parts 12 are arranged at intervals along the extension direction of the long axis side 1113, and the diaphragm 21 is located between the two first magnetic circuit parts 12. In this case, the two first magnetic circuit parts 12 and the diaphragm 21 are arranged sequentially along the extension direction of the long axis side 1113.

[0100] Of course, in other embodiments, the magnetic yoke 11 can also be configured as a split structure, that is, the magnetic yoke 11 includes two lower magnetic yokes, the two lower magnetic yokes correspond to two first magnetic circuit parts 12 respectively, that is, each lower magnetic yoke is connected to a first magnetic circuit part 12 and forms a first magnetic gap 13. At this time, the accommodating space 117 formed between the two first magnetic circuit parts 12 is a through cavity structure with open ends, which is not limited here.

[0101] In one embodiment, along the vibration direction of the diaphragm 21, the top surface of the diaphragm 21 is lower than the top surfaces of the two first magnetic circuit portions 12. That is, the top surface of the diaphragm 21 is lower than the side surface of the first magnetic circuit portion 12 facing away from the magnetic yoke 11. It can be understood that this arrangement can effectively reduce the thickness or height of the sound-generating unit 100 in the vibration direction of the diaphragm 21.

[0102] In this embodiment, the two first magnetic circuit portions 12 are located on both sides of the diaphragm 21 and do not coincide with the vibration direction of the diaphragm 21. At this time, it is not necessary to reserve space for the vibration of the diaphragm 21 in the height direction of the first magnetic circuit portion 12. The thickness of the surface of the first magnetic circuit portion 12 on the side opposite to the magnetic yoke 11 to the bottom wall 111 of the magnetic yoke 11 on the side opposite to the first magnetic circuit portion 12 is the thickness or height of the sound-generating unit 100 in the vibration direction of the diaphragm 21, thereby effectively reducing the thickness of the sound-generating unit 100. At the same time, the thickness of the first magnetic circuit portion 12 in the vibration direction of the diaphragm 21 can be effectively increased, thereby effectively improving the magnetic field performance of the first magnetic circuit portion 12 and increasing the BL value.

[0103] Understandably, by making the top surface of the diaphragm 21 lower than the side surface of the first magnetic circuit portion 12 facing away from the magnetic yoke 11, the thickness or height of the sound-generating unit 100 in the vibration direction of the diaphragm 21 can be effectively ensured, and the amplitude of the diaphragm 21 in its vibration direction can be guaranteed. It should be noted that when the sound-generating unit 100 is applied in a module or electronic device, the top surface of the diaphragm 21 is lower than the side surface of the first magnetic circuit portion 12 facing away from the magnetic yoke 11, so that the housing of the module or electronic device does not need to reserve vibration space for the diaphragm 21, which can further reduce the thickness of the module or electronic device and achieve thinning.

[0104] The sound-generating unit 100 of the present invention configures the magnetic circuit system 1 as a magnetic yoke 11 and two first magnetic circuit parts 12. The magnetic yoke 11 is configured with two long axis sides 1113 and two short axis sides 1114 connected end to end. The two first magnetic circuit parts 12 are arranged at intervals along the extending direction of the long axis sides 1113 on the magnetic yoke 11, and a receiving space 117 is formed between the two first magnetic circuit parts 12. Each first magnetic circuit part 12 includes a magnetic circuit assembly 121. The receiving space 117 provides installation and vibration space for the diaphragm 21 of the vibration system 2, so that the projections of the diaphragm 21 and the two first magnetic circuit parts 12 on the magnetic yoke 11 do not overlap. This allows the diaphragm 21 to have sufficient vibration space while increasing the space for the magnetic circuit assembly 121 of the first magnetic circuit parts 12 on the diaphragm 21. The thickness of the diaphragm 21 in the vibration direction is reduced, and the top surface of the diaphragm 21 is lower than the top surface of the two first magnetic circuit parts 12. Compared with the traditional sound-generating unit where the diaphragm and magnetic circuit components are arranged vertically, this effectively reduces the thickness of the sound-generating unit 100 in the diaphragm vibration direction. Furthermore, the magnetic circuit components 121 of the two first magnetic circuit parts 12 can effectively increase the heat dissipation area, which is beneficial for heat dissipation when the sound-generating unit 100 is working. In addition, by setting the magnetic yoke 11 as an integral structure in a rectangular arrangement, the structural strength of the magnetic circuit system 1 is enhanced, ensuring the installation and positioning of the magnetic circuit components 121 of the two first magnetic circuit parts 12 and the two first voice coils 23, thereby ensuring the consistency and vibration effect of the diaphragm 21 as it vibrates with the two first voice coils 23, so as to improve the sound production effect and acoustic performance of the sound-generating unit 100.

[0105] In this embodiment, the diaphragm 21 has two first sides 216 and two second sides 217 connected end-to-end. The two first sides 216 are respectively connected to two first magnetic circuit portions 12, and the two second sides 217 are respectively connected to the magnetic yoke 11. It can be understood that the diaphragm 21 is directly connected to the magnetic circuit system 1, eliminating the need for a shell structure, thereby reducing production costs and simplifying the structure. In this embodiment, the first sides 216 of the diaphragm 21 extend along a third direction, and the second sides 217 of the diaphragm 21 extend along a second direction.

[0106] Of course, in other embodiments, the sound-generating unit 100 also includes a shell or housing, in which case the shell or housing is disposed between the diaphragm 21 and the magnetic yoke 11, that is, the two second sides 217 of the diaphragm 21 are respectively connected to the magnetic yoke 11 through the shell or housing, which is not limited here. Optionally, the shell or housing and the magnetic yoke 11 can be configured as an integrally formed structure, which is not limited here.

[0107] In one embodiment, the sound-generating unit 100 includes a housing for housing the fixed vibration system 2 and the magnetic circuit system 1. The housing includes a bottom plate and side plates, which together form an installation space. A magnetic yoke 11 is fixed to the surface of the bottom plate. Alternatively, the bottom plate has a through hole, and the magnetic yoke 11 is embedded in the through hole. Alternatively, the magnetic yoke 11 is integrally formed with the bottom plate.

[0108] Understandably, the housing may optionally be a square frame structure, that is, the housing has a cavity structure with openings at both ends. The magnetic yoke 11 is connected to one side of the housing, and the two first magnetic circuit parts 12 and the diaphragm 21 cover the opening on the other side of the housing and are opposite to the magnetic yoke 11. Optionally, the housing and the magnetic yoke 11 may be integrally injection molded; or, the housing and the magnetic yoke 11 may be connected by welding or bonding, etc., which is not limited here. Of course, in other embodiments, the sound-generating unit 100 may not have a housing, in which case the two first magnetic circuit parts 12 and the diaphragm 21 are directly connected to the magnetic yoke 11, which is not limited here.

[0109] In this embodiment, the housing is configured as a bottom plate and side plates, which together form an installation space to accommodate and fix the vibration system 2 and the magnetic circuit system 1. Optionally, the magnetic yoke 11 is fixed to the surface of the bottom plate, for example, by welding or bonding, which is not limited here. Of course, the magnetic yoke 11 and the bottom plate can also be integrally formed, for example by integral injection molding or integral stretching or stamping, which is not limited here.

[0110] Of course, in other embodiments, the magnetic yoke 11 is embedded in a through hole provided in the base plate, so that the magnetic yoke 11 blocks the through hole of the base plate, etc., which is not limited here.

[0111] In this embodiment, the sound-generating unit 100 is applied in an electronic device, meaning that the sound-generating unit 100 can be mounted on the electronic device through a housing. It should be noted that the housing of the sound-generating unit 100 can be a separate shell or enclosure structure from the electronic device. In this case, the housing integrates the magnetic circuit system 1 and vibration system 2 of the sound-generating unit 100 into a single integrated structure, facilitating assembly and disassembly. Alternatively, the housing of the sound-generating unit 100 can be integrally molded with the shell or enclosure structure of the electronic device, which effectively improves structural strength and sealing performance.

[0112] Understandably, the housing is used to house structures such as the fixed vibration system 2 and the magnetic circuit system 1, so that the sound-generating unit 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 unit 100 can also be a module structure, in which case the vibration system 2 and the magnetic circuit system 1 of the sound-generating unit 100 are mounted as multiple independent components on the housing of the module structure, which is not limited here.

[0113] In this embodiment, the magnetic yoke 11 may optionally be a split structure. The magnetic yoke 11 includes a first magnetic yoke and two second magnetic yokes arranged at intervals. The first magnetic yoke is connected to the side of the central magnetic circuit 14 facing away from the diaphragm 21, and each second magnetic yoke is connected to a first magnetic circuit portion 12. Optionally, the first magnetic yoke and the two second magnetic yokes of the magnetic yoke 11 are fixed to the surface of the base plate, for example, by welding or bonding, which is not limited here. Of course, the first magnetic yoke and the two second magnetic yokes of the magnetic yoke 11 can also be integrally formed with the base plate, for example, by integral injection molding or integral stretching or stamping, which is not limited here.

[0114] Of course, in other embodiments, by providing multiple through holes in the base plate, the first magnetic yoke and two second magnetic yokes of the magnetic yoke 11 are respectively embedded in the multiple through holes, so that the first magnetic yoke and two second magnetic yokes of the magnetic yoke 11 block the multiple through holes of the base plate, etc., which is not limited here.

[0115] In one embodiment, the magnetic yoke 11 includes a bottom wall 111 and a side wall 112 arranged at an angle, with the side wall 112 and the bottom wall 111 enclosing a cavity 113.

[0116] In this embodiment, as Figures 2 to 5 , Figures 7 to 9 , Figure 12 , Figure 13 , Figure 15 , Figure 16 As shown, the magnetic yoke 11 is an integral structural component, and the bottom wall 111 and the side wall 112 are integrally formed. Optionally, the side wall 112 is perpendicular to the bottom wall 111.

[0117] It should be noted that the sidewall 112 can be formed by bending the periphery of the bottom wall 111 towards one side. Of course, in other embodiments, the sidewall 112 has a ring-shaped structure, and the sidewall 112 is connected to the bottom wall 111 by welding or bonding, etc., which is not limited here.

[0118] Understandably, the two first magnetic circuit portions 12 are spaced apart within the cavity 113 of the magnetically conductive yoke 11, that is, the two first magnetic circuit portions 12 are connected to the bottom wall 111 of the magnetically conductive yoke 11, so that the two first magnetic circuit portions 12 are spaced apart and enclosed with the bottom wall 111 of the magnetically conductive yoke 11 to form a receiving space 117 with an opening on one side. In this embodiment, the diaphragm 21 is disposed in the receiving space 117 and located between the two first magnetic circuit portions 12. The two first sides 216 of the diaphragm 21 are respectively connected to the two first magnetic circuit portions 12, and the two second sides 217 are respectively connected to the side wall 112, so that the diaphragm 21 is spaced apart from the bottom wall 111.

[0119] In one embodiment, the magnetic yoke 11 further includes two side plates 114 located within the cavity 113. The two side plates 114 are spaced apart from the bottom wall 111. The accommodating space 117 is located between the two side plates 114. The side of each side plate 114 facing away from the accommodating space 117 is enclosed with the side wall 112 to form an accommodating space 1141. Each magnetic circuit assembly 121 is disposed within an accommodating space 1141 and is spaced apart from the side wall 112 and the side plate 114 to form a first magnetic gap 13. One end of the first voice coil 23 is suspended in the first magnetic gap 13.

[0120] In this embodiment, as Figure 15 and Figure 16 As shown, two side plates 114 are provided on the bottom wall 111 of the magnetic yoke 11, such that the two side plates 114 are spaced apart within the cavity 113, forming a receiving space 117 between the two side plates 114. The side of each side plate 114 facing away from the receiving space 117 is enclosed by the side wall 112 to form a receiving space 1141, thereby facilitating the installation and fixing of the magnetic circuit assembly 121 of the first magnetic circuit part 12 using the receiving space 1141. Each magnetic circuit assembly 121 of the first magnetic circuit part 12 is disposed within a receiving space 1141, and is spaced apart from the side wall 112 and the side plate 114 to form a first magnetic gap 13. Optionally, the bottom wall 111, the side plate 114, and the side wall 112 are integrally formed. Optionally, the side plate 114 is perpendicular to the bottom wall 111.

[0121] Understandably, each of the two first magnetic circuit sections 12 and the magnetic yoke 11 cooperate to form a first magnetic gap 13, so that each of the two first voice coils 23 is located in a first magnetic gap 13 and connected to the diaphragm 21 through the frame 22. In this way, the two first voice coils 23 drive the diaphragm 21 to vibrate and produce sound under the magnetic field of the two first magnetic circuit sections 12, effectively improving the driving force, thereby improving the BL value and acoustic performance of the sound-producing unit 100.

[0122] Optionally, the two side plates 114 are arranged at intervals along the long axis of the magnetic yoke 11. In this embodiment, the two side plates 114 are arranged at intervals along the long axis edge 1113 of the magnetic yoke 11, such that the two first magnetic circuit portions 12 are arranged at intervals along the extending direction of the long axis edge 1113. Optionally, the side plates 114 and the bottom wall 111 are integrally formed, which simplifies the processing steps of the magnetic yoke 11 and improves the structural strength of the magnetic yoke 11.

[0123] In this embodiment, as Figure 15 and Figure 16As shown, each side plate 114 also has clearance notches 1143 at both ends, connecting the receiving space 1141 and the accommodating space 117. The end of the frame 22 away from the diaphragm 21 passes through the clearance notch 1143 and is connected to the first voice coil 23. Understandably, this arrangement facilitates the connection between the frame 22 and the voice coil 23, allowing the diaphragm 21 to be connected to the two voice coils 23 located on both sides of the diaphragm 21 through the frame 22.

[0124] During the vibration of the diaphragm 21, in order to ensure the balance of air pressure inside and outside the sound-generating unit 100, in one embodiment, the magnetic yoke 11 is also provided with a leakage hole 1142 communicating with the cavity 113. It is understood that the leakage hole 1142 communicates the internal vibration space of the sound-generating unit 100 with the external air pressure. In this embodiment, there are multiple leakage holes 1142, which are spaced apart on the sidewall 112.

[0125] Optionally, a plurality of leakage holes 1142 are spaced apart on the sidewall 112 of the magnetic yoke 11. That is, the plurality of leakage holes 1142 are arranged at intervals along the periphery of the sidewall 112. Of course, in other embodiments, the leakage holes 1142 may also be provided on the bottom wall 111 of the magnetic yoke 11, which is not limited here. Optionally, the leakage holes 1142 may be circular holes, elliptical holes, strip holes, triangular holes, square holes, polygonal holes, irregularly shaped holes, etc., which are not limited here.

[0126] In one embodiment, such as Figure 15 and Figure 16 As shown, the bottom wall 111 has a through hole 1112 extending through the bottom wall 111 adjacent to each side plate 114. Optionally, each side plate 114 is bent into shape from the side of the bottom wall 111 adjacent to the through hole 1112 toward the cavity 113. The sound-generating unit 100 also includes a cover plate 115, which covers the through hole 1112.

[0127] In one embodiment, the sound-generating unit 100 further includes a cover plate 115, which covers the through hole 1112. In this embodiment, as... Figures 7 to 9 , Figure 12 , Figure 13 , Figure 15 and Figure 16 As shown, by setting a cover plate 115, the through hole 1112 is covered and sealed by the cover plate 115. Thus, when the sound-generating unit 100 is installed in the module housing or the housing of the electronic device, in order to reduce the thickness or height of the module or electronic device in the vibration direction of the diaphragm 21, the bottom wall 111 of the magnetic yoke 11 of the sound-generating unit 100 is exposed outside the module housing or the housing of the electronic device. At this time, the cover plate 115 seals the through hole 1112 to ensure the sound generation effect of the sound-generating unit 100 and to prevent foreign objects from entering the sound-generating unit 100 through the through hole 1112 and affecting the sound generation performance of the sound-generating unit 100.

[0128] Optionally, the bottom wall 111 of the magnetic yoke 11 has a through hole 1112 adjacent to each side plate 114, and two cover plates 115 are included, each cover plate 115 covering one through hole 1112, which is not limited here. It can be understood that the thickness of the cover plate 115 is less than the thickness of the bottom wall 111 of the magnetic yoke 11. In this embodiment, the cover plate 115 is connected to the side of the bottom wall 111 of the magnetic yoke 11 facing away from the cavity 113.

[0129] Of course, in other embodiments, the cover plate 115 may also be configured as an annular integral structure, in which case the annular cover plate 115 simultaneously covers multiple through holes 1112, which is not limited here.

[0130] To further reduce the thickness or height of the sound-generating unit 100 in the vibration direction of the diaphragm 21 and improve the aesthetic appearance of the sound-generating unit 100, in one embodiment, a limiting groove 1111 is provided on the side of the bottom wall 111 facing away from the cavity 113, and a through hole 1112 penetrates the bottom wall 111 of the limiting groove 1111. A cover plate 115 is confined within the limiting groove 1111 and covers the through hole 1112. Optionally, the side of the cover plate 115 facing away from the cavity 113 is flush with the side of the bottom wall 111 facing away from the cavity 113.

[0131] In one embodiment, each magnetic circuit assembly 121 includes at least two first magnets 1211 and at least one first magnetic plate 1212. The at least two first magnets 1211 are stacked on the magnetic yoke 11 along the vibration direction of the diaphragm 21, and the first magnetic plate 1212 is sandwiched between two adjacent first magnets 1211. Furthermore, the first magnets 1211 are all magnetized along the vibration direction of the diaphragm 21, and the magnetization directions of two adjacent first magnets 1211 located on both sides of the first magnetic plate 1212 are opposite.

[0132] Optionally, each magnetic circuit assembly 121 is disposed within a receiving space 1141 of the magnetic yoke 11. For example... Figure 2 , Figure 3 , Figure 5 , Figures 8 to 14 As shown, by stacking the first magnet 1211 and the first magnetic plate 1212 of the magnetic circuit assembly 121 in the accommodating space 1141 of the magnetic yoke 11, the first magnet 1211 and the first magnetic plate 1212 are spaced apart from the side wall 112 and the side plate 114 of the magnetic yoke 11 to form a first magnetic gap 13, thereby facilitating the use of the first magnetic gap 13 to provide installation space for the first voice coil 23.

[0133] Optionally, the first magnet 1211 includes multiple first magnets, and the first magnetic plate 1212 includes at least one first magnetic plate; that is, when the number of first magnets 1211 is N, the number of first magnetic plates 1212 is N-1. In this embodiment, as... Figure 2 , Figure 3 , Figure 5 , Figures 8 to 14 As shown, there are two first magnets 1211 and one first magnetic plate 1212. Optionally, the first magnets 1211, the first magnetic plate 1212, and the first magnets 1211 are stacked on the bottom wall 111 of the magnetic yoke 11 along the vibration direction of the diaphragm 21. Optionally, both first magnets 1211 are magnetized along the vibration direction of the diaphragm 21, and the magnetization directions of two adjacent first magnets 1211 located on both sides of the first magnetic plate 1212 are opposite.

[0134] In this embodiment, the peripheries of the first magnet 1211 and the first magnetic plate 1212 of the magnetic circuit assembly 121 are spaced apart from the sidewalls 112 and side plates 114 of the magnetic yoke 11 to form a first magnetic gap 13. Optionally, the first magnet 1211 and the first magnetic plate 1212 are plate-shaped. It is understood that the first magnetic gap 13 may optionally be square, rectangular, or racetrack-shaped, and the shape of the first voice coil 23 is similar to the shape of the first magnetic gap 13. Optionally, the thickness of the first magnet 1211 is greater than the thickness of the first magnetic plate 1212, which can effectively ensure the magnetic field strength of the magnetic circuit assembly 121.

[0135] In order to facilitate the connection between the voice coil 23 and the diaphragm 21 via the skeleton 22, in this embodiment, the side plate 114 extends along the short axis side 1114 of the magnetic yoke 11 and is spaced apart from the long axis side 1113 of the side wall 112 of the magnetic yoke 11 to form an avoidance notch 1143, that is, the first magnetic gap 13 is connected to the receiving space 117 through the avoidance notch 1143.

[0136] In one embodiment, each cover 123 covers a magnetic circuit assembly 121 and is connected to the magnetic yoke 11 and / or the magnetic circuit assembly 121.

[0137] In this embodiment, as Figure 2 , Figure 5 , Figure 6 , Figure 8 , Figure 9 , Figure 12 and Figure 13 As shown, by providing a cover 123 to close the opening of the accommodating space 1141 and connecting it to the magnetic yoke 11, the cover 123 covers a magnetic circuit assembly 121, thus achieving the installation and fixation of the magnetic circuit assembly 121 of the first magnetic circuit part 12 with the magnetic yoke 11. It can be understood that the first magnetic plate 1212 is sandwiched between two adjacent first magnets 1211.

[0138] Understandably, the two first magnets 1211 are connected to the bottom wall 111 of the magnetic yoke 11 and the cover 123, respectively. Optionally, the cover 123 is made of a magnetically conductive material. This arrangement can effectively homogenize the magnetism of the first magnets 1211 in the magnetic circuit assembly 121.

[0139] In one embodiment, the cover 123 includes a top plate 1231 and a surrounding plate 1232 disposed around the top plate 1231. The surrounding plate 1232 and the top plate 1231 enclose a cavity 1233. At least a portion of the magnetic circuit assembly 121 is accommodated in the cavity 1233 and connected to the top plate 1231. The surrounding plate 1232 is connected to the magnetic yoke 11.

[0140] In this embodiment, as Figure 2 , Figure 5 , Figure 6 , Figure 8 , Figure 9 , Figure 12 and Figure 13 As shown, by setting the cover 123 as a cavity 1233 structure formed by the top plate 1231 and the surrounding plate 1232, it is possible to both install, fix, and limit the installation of the first magnet 1211 and the first magnetic plate 1212, and to utilize the side wall 112 and side plate 114 of the magnetic yoke 11 to cooperate with the surrounding plate 1232 of the cover 123 to form a first magnetic gap 13. Of course, this arrangement can also facilitate the installation and fixing of other components, such as the centering support plate 25, etc., which are not limited here.

[0141] In one embodiment, the periphery of the cover 123 extends into the receiving space 117 to form an extension 1234, and the two edges of the diaphragm 21 located in the arrangement direction of the two magnetic circuit components 121 are connected to the extension 1234. A front acoustic cavity 320 is formed between the two covers 123, the diaphragm 21 and the module housing 300.

[0142] In this embodiment, as Figure 2 , Figure 5 , Figure 6 , Figure 8 , Figure 9 , Figure 12 and Figure 13 As shown, an extension 1234 is provided at the periphery of the first magnetic circuit portion 12, that is, the periphery of the cover 123 extends towards the diaphragm 21 to form the extension 1234, so that the diaphragm 21 is connected to the extension 1234. In this way, the extension 1234 is used to connect and fix the diaphragm 21 to improve the installation stability of the diaphragm 21. It can be understood that the diaphragm 21 is sandwiched between the extension 1234 and the magnetic yoke 11, so that the two covers 123, the diaphragm 21 and the module housing 300 form a front acoustic cavity 320.

[0143] Understandably, the extension 1234 extends from the periphery of the cover 123 toward the diaphragm 21, that is, the extension 1234 extends from the end of the cover 1232 away from the top plate 1231 toward the side opposite to the cavity 1233. Optionally, the extension 1234 is disposed around the periphery of the cover 1232, which is not limited here.

[0144] Optionally, the side of the cover 123 facing away from the magnetic yoke 11 is flush with the outer surface of the module housing 300. This arrangement effectively ensures that the maximum height of the sound-generating unit 100 along the vibration direction of the diaphragm 21 is not greater than the height of the sound-generating module 400 along the vibration direction of the diaphragm 21.

[0145] In this embodiment, as Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, along the vibration direction of the diaphragm 21, the height of the sound-generating unit 100 is approximately the same as the height of the sound-generating module 400. It can be understood that along the vibration direction of the diaphragm 21, the maximum height of the sound-generating unit 100 is the same as or approximately the same as the height of the sound-generating module 400, that is, the maximum height of the sound-generating unit 100 is not greater than the height of the sound-generating module 400.

[0146] It should be noted that the distance from the diaphragm 21 to the outer surface of the top plate 1231 of the cover 123 of the first magnetic circuit part 12 is defined as L, and the maximum amplitude of the diaphragm 21 is defined as Xmax. It is necessary to satisfy L≥Xmax, so that the whole end does not need to reserve additional vibration space, which is conducive to further thinning of the whole end.

[0147] In one embodiment, the diaphragm 21 includes a central portion 211, a folded ring portion 212 surrounding the central portion 211, and a fixing portion 213 disposed outside the folded ring portion 212.

[0148] In this embodiment, as Figure 6 , Figures 8 to 10 , Figure 12 , Figure 13 , Figure 17 As shown, the fixing part 213, the folded ring part 212, and the central part 211 of the diaphragm 21 are sequentially connected to form an integral structure, thereby ensuring the vibration performance and structural strength of the diaphragm 21. It is understood that the fixing part 213 is connected to the magnetic circuit system 1, the central part 211 has a hollow hole 2111, and the vibration system 2 also includes a dome 215, which covers the hollow hole 2111. Optionally, the folded ring part 212 is a recessed structure facing the side where the magnetic yoke 11 is located. Of course, in other embodiments, the folded ring part 212 can also be a convex structure facing the side away from the magnetic yoke 11, which is not limited here.

[0149] It is understandable that the diaphragm 21 is square in shape. For example, it can be rectangular or square, and is not limited here. In this embodiment, the fixing part 213 of the diaphragm 21 has two first sides 216 and two second sides 217. The two first sides 216 of the fixing part 213 are respectively connected to the covers 123 of the two first magnetic circuit parts 12, that is, the two first sides 216 are respectively connected to the extensions 1234 of the two covers 123 of the two first magnetic circuit parts 12. Optionally, the two edges of the diaphragm 21 extending along the arrangement direction of the two first magnetic circuit parts 12 are connected to the sidewall 112.

[0150] Optionally, the extension 1234 and the first side 216 of the fixing part 213 can be connected and fixed by adhesive. In this embodiment, the extension 1234 is connected to the side of the first side 216 of the fixing part 213 facing away from the receiving space 117.

[0151] In one embodiment, the central portion 211 is provided with a perforated hole 2111, and the vibration system 2 further includes a dome 215, which covers the perforated hole 2111. It is understood that... Figure 9 , Figure 12 , Figure 17 As shown, by setting a perforated hole 2111 in the central part 211 of the diaphragm 21 and setting a dome 215 to cover the perforated hole 2111, the dome 215 can be used to improve the structural strength of the diaphragm 21 and seal the perforated hole 2111 to prevent debris from entering the interior of the sound-generating unit 100 through the perforated hole 2111 and affecting the acoustic performance of the sound-generating unit 100.

[0152] To further improve the structural strength and rigidity of the dome 215, in one embodiment, the dome 215 has a protrusion 2151 or a depression at its center. It is understood that the protrusion 2151 of the dome 215 can be a protruding structure added to the thickness of the dome 215. Of course, in other embodiments, the protrusion 2151 of the dome 215 can also be a protruding structure formed by one side of the dome 215 protruding towards the other side, such that one side of the dome 215 is concave and the other side is convex; this is not limited to this embodiment.

[0153] In one embodiment, along the vibration direction of the diaphragm 21, the projection of the periphery of the dome 215 onto the diaphragm 21 coincides with a portion of the folded ring 212. This further enhances the effective radiation area of ​​the diaphragm 21.

[0154] Understandably, the periphery of the dome 215 is connected to the side of the central portion 211 facing away from the receiving space 117. Of course, in other embodiments, the periphery of the dome 215 may also be connected to the side of the central portion 211 facing the receiving space 117. In this embodiment, as... Figure 8 , Figure 13As shown, the edge portion 2152 of the dome 215 is located on the side of the diaphragm 21 facing away from the receiving space 117.

[0155] In one embodiment, the diaphragm 21 further includes a bending portion 214, which is connected to the side of the fixing portion 213 away from the folded ring portion 212 and is set at an angle to the fixing portion 213. The bending portion 214 is connected to the side wall 112.

[0156] In this embodiment, as Figure 6 , Figure 9 , Figure 12 and Figure 17 As shown, by providing a bend 214 at the periphery of the diaphragm 21, the bend 214 is connected to the magnetic yoke 11, thereby improving the connection stability of the diaphragm 21. It can be understood that the bend 214 is connected to the side of the fixing part 213 away from the folded ring part 212, and is set at an angle to the fixing part 213. The bend 214 is connected to the side wall 112 of the magnetic yoke 11. Optionally, the bend 214 is set perpendicular to the fixing part 213.

[0157] Optionally, the bent portion 214 is bent from the side of the fixing portion 213 away from the folded ring portion 212 toward the guide yoke 11. This arrangement helps to ensure the structural strength of the fixing portion 213 and the bent portion 214 of the diaphragm 21. In this embodiment, the central portion 211, the folded ring portion 212, the fixing portion 213 and the bent portion 214 are integrally formed structures.

[0158] In this embodiment, the bent portion 214 is formed by bending the second side 217 of the fixed portion 213 toward the guide yoke 11. It can be understood that the two second sides 217 of the fixed portion 213 of the diaphragm 21 are respectively connected to the bent portion 214, and the two first sides 216 of the fixed portion 213 of the diaphragm 21 are not provided with other structures. This allows for easy connection with the extensions 1234 of the two covers 123 in the two first magnetic circuit portions 12, without affecting the vibration performance of the diaphragm 21; at the same time, it also facilitates smooth airflow.

[0159] Optionally, the bent portion 214 and the side wall 112 of the magnetic yoke 11 can be connected and fixed by adhesive. In order to facilitate the positioning of the diaphragm 21 and prevent the diaphragm 21 from falling off due to insecure fixing, in this embodiment, the bent portion 214 is connected to the outside of the side wall 112 of the magnetic yoke 11, so that the end of the side wall 112 of the magnetic yoke 11 is limited and abutted against the fixing portion 213 of the diaphragm 21, so as to achieve support and fixation of the diaphragm 21.

[0160] In one embodiment, the frame 22 includes a first support portion 221, a first connecting portion 222 and a second support portion 223 connected to each other. The first support portion 221 is connected to the central portion 211 of the diaphragm 21, and the second support portion 223 is connected to the first voice coil 23.

[0161] In this embodiment, as Figures 8 to 14 As shown, one end of the frame 21 is connected to the diaphragm 21, and the other end is connected to the first voice coil 23 located in the first magnetic gap 13. It can be understood that the first support part 221, the first connecting part 222, and the second support part 223 of the frame 22 are integrally formed structures, which can ensure the structural strength of the frame 22.

[0162] Understandably, the frame 22 serves two purposes: it mounts and fixes the first voice coil 23, ensuring that the first voice coil 23 is suspended within the first magnetic gap 13, and it also transmits the vibration of the first voice coil 23 to the diaphragm 21, thus achieving vibration transmission and ensuring the normal sound production of the diaphragm 21. In this embodiment, the first support portion 221 of the frame 22 is connected to the central portion 211 of the diaphragm 21, and the second support portion 223 of the frame 22 is connected to the first voice coil 23. That is, the second support portion 223 of the frame 22 extends through the clearance notch 1143 into the first magnetic gap 13 and connects with the first voice coil 23. Optionally, the second support portion 223 of the frame 22 is connected to the lower end of the first voice coil 23, which can improve the installation stability of the frame 22 and the first voice coil 23.

[0163] In this embodiment, the frame 22 is located below the diaphragm 21. When the loop portion 212 protrudes towards the side where the guide yoke 11 is located, the frame 22 has a clearance area 224 corresponding to the loop portion 212 to avoid the loop portion 212 of the diaphragm 21. In this embodiment, the frame 22 can be a directional frame structure. The shape and contour of the second support portion 223 of the frame 22 are similar to the shape and contour of the end face of the first voice coil 23 to facilitate fixing the first voice coil 23.

[0164] Optionally, the frame 22 includes two frames, which are symmetrically arranged. It is understood that the two frames 22 are located on opposite sides of the diaphragm 21 and are symmetrically arranged with respect to the diaphragm 21. In this embodiment, the two frames 22 are arranged corresponding to the two first sides 216 of the diaphragm 21.

[0165] In this embodiment, as Figures 9 to 11 As shown, a support platform 226 is provided at one end of the first connecting part 222 adjacent to the second support part 223. It can be understood that by providing the support platform 226 on the frame 22, the support platform 226 provides an installation position for conductive structures such as the centering support piece 25, and further enables the first voice coil 23 to be connected and conductive to the external circuit through the centering support piece 25.

[0166] Understandably, the first connecting portion 222 of the frame 22 is provided with two support platforms 226, which are located on both sides of the clearance space, that is, at both ends of the first voice coil 23. Optionally, the first voice coil 23 extends along the short axis side 1114 of the magnetic yoke 11, and the two support platforms 226 are spaced apart along the short axis side 1114 of the magnetic yoke 11.

[0167] Optionally, the frame 22 includes four frames, one end of each frame 22 is connected to the diaphragm 21, and the other end of each frame 22 is connected to the first voice coil 23. In this embodiment, two of the four frames 22 are spaced apart along the short axis 1114 of the magnetic yoke 11 and are located at both ends of the first voice coil 23, that is, two of the four frames 22 are located at both ends of the side plate 114. It can be understood that the second support portion 223 of each frame 22 extends into the first magnetic gap 13 through the clearance notch 1143 and is connected to the first voice coil 23.

[0168] In one embodiment, the vibration system 2 further includes a centering support 25, which includes an outer fixing part 251, an inner fixing part 253, and a spring arm part 252 connecting the outer fixing part 251 and the inner fixing part 253. The inner fixing part 253 is connected to the frame 22 and electrically connected to the first voice coil 23.

[0169] In this embodiment, the external fixing part 251 is connected to the magnetic yoke 11. It should be noted that the external fixing part 251 is located on the side of the two magnetic circuit assemblies 121 facing away from the receiving space 117 and is connected to the magnetic yoke 11.

[0170] Understandable, such as Figures 9 to 12 , Figure 14 , Figure 18 and Figure 19 As shown, by setting the centering support 25, the external current can be introduced into the first voice coil 23, and the centering support 25 can also center the vibration of the first voice coil 23, preventing the first voice coil 23 from swinging or polarizing during vibration, thereby improving the sound production effect and acoustic performance of the sound-generating unit 100.

[0171] In this embodiment, as Figures 9 to 11 , Figure 18 As shown, the outer fixing part 251 of the centering support 25 can be a ring or a frame structure. The centering support 25 includes multiple elastic arms 252 and multiple inner fixing parts 253. One end of each elastic arm 252 is connected to the outer fixing part 251, and the other end is connected to an inner fixing part 253. Optionally, the multiple inner fixing parts 253, the multiple elastic arms 252, and the outer fixing part 251 of the centering support 25 are integrally formed, that is, the centering support 25 is a single structural component.

[0172] Of course, in other embodiments, the centering support piece 25 may be one, two, or four. When there is one centering support piece 25, its structure is as described above, and the outer fixing part 251 of the centering support piece 25 may be an annular or frame structure. When there are two centering support pieces 25, they are symmetrically arranged. Optionally, the two centering support pieces 25 may be symmetrically arranged on the two long axis sides 1113 of the magnetic yoke 11; or, the two centering support pieces 25 may be symmetrically arranged on the two short axis sides 1114 of the magnetic yoke 11, without limitation. In this case, each centering support piece 25 includes one outer fixing part 251, two spring arm parts 252, and two inner fixing parts 253. When there are four centering support pieces 25, the four centering support pieces 25 are respectively arranged at the four corner positions of the magnetic yoke 11, without limitation. At this time, each centering support 25 includes an external fixing part 251, a spring arm part 252 and an internal fixing part 253, which are not limited here.

[0173] Optionally, the centering support 25 may be a single piece. In one embodiment, as shown... Figure 18 As shown, the outer fixing part 251 has two first sides and two second sides connected end to end, and the connection between each first side and a second side forms a corner 256; the spring arm part 252 includes four, one end of each spring arm part 252 is connected to the corner 256, and the other end of each spring arm part 252 is connected to the inner fixing part 253. The inner fixing part 253 is connected to the frame 22 and electrically connected to the first voice coil 23.

[0174] Understandably, two of the four spring arms 252 of the centering support 25 are located at both ends of each first voice coil 23 along a third direction. In this embodiment, the first edge of the outer fixing part 251 extends along a third direction, and the second edge extends along a second direction.

[0175] In this embodiment, as Figures 9 to 12 , Figure 14 , Figure 18 and Figure 19 As shown, each first side of the centering support 25 is sandwiched between the first magnetic circuit portion 12 and the magnetic yoke 11, and at least a portion of each second side is sandwiched between the fixing portion 213 and the magnetic yoke 11.

[0176] Understandable, such as Figures 9 to 11 , Figure 18As shown, the outer fixing part 251 is square-shaped and has four corner portions 256. Four spring arms 252 are included, each corresponding to one corner portion 256. Optionally, the four spring arms 252 of the four corner portions 256 of the centering support 25 are all located on the outer side of the diaphragm 21. Thus, the centering support 25 does not interfere with the diaphragm 21, and the folded ring portion 212 of the diaphragm 21 can be recessed towards the side where the guide yoke 11 is located, increasing the sound output space on the front side of the diaphragm 21 when installed in a sound-generating module or the entire unit. In this embodiment, the outer fixing part 251 of the centering support 25 also has an outer solder pad for connecting external circuitry.

[0177] Understandably, to further secure the inner fixing part 253 of the centering support 25 and ensure the firmness of the connection between the inner fixing part 253 and the lead wire of the first voice coil 23, the frame 22 is provided with a support platform 226 adjacent to the first voice coil 23. The inner fixing part 253 is connected to the support platform 226 and to the lead wire of the first voice coil 23. It should be noted that, in order to ensure the deformation capability of the centering support 25, the spring arm part 252 has at least one bend.

[0178] In one embodiment, such as Figures 9 to 11 , Figure 18 As shown, each first voice coil 23 extends along the short axis of the outer fixed portion 251 and is located between the two spring arms 252. Each first voice coil 23 has an input lead and an output lead at both ends, and the input lead and the output lead are respectively connected to a spring arm 252. It can be understood that the two first voice coils 23 are connected in series through the centering support 25.

[0179] In another embodiment, such as Figure 19 As shown, the outer fixing part 251 of the centering support plate 25 has a square ring structure, and the inner fixing part 253 has a square ring structure. At this time, the outer fixing part 251 of the centering support plate 25 is located between the diaphragm 21 and the magnetic yoke 11, the elastic arm part 252 corresponds to the folded ring part 212 of the diaphragm 21, and the inner fixing part 253 is connected to the central part 211 of the diaphragm 21.

[0180] In this embodiment, as Figure 12 , Figure 14 and Figure 19 As shown, by setting the centering support 25 as two nested outer fixing parts 251 and inner fixing parts 253, and connecting the outer fixing parts 251 and inner fixing parts 253 through the spring arm part 252, the outer fixing part 251 can be installed and fixed by the magnetic yoke 11 to the diaphragm 21 and the cover 123 of the first magnetic circuit part 12 to fix the centering support 25, while the inner fixing part 253 is connected to the central part 211 of the diaphragm 21 to ensure the connection stability between the diaphragm 21 and the centering support 25.

[0181] Understandably, the spring arm portion 252 corresponds to the folded ring portion 212 of the diaphragm 21. In order to avoid interference between the folded ring portion 212 of the diaphragm 21 and the spring arm portion 252 of the centering support plate 25 during vibration, the folded ring portion 212 of the diaphragm 21 is configured as a convex hull structure that extends away from the side where the magnetic yoke 11 is located.

[0182] Furthermore, in the projection along the first direction, the spring arm portion 252 of the centering support 25 corresponds to the edge positions on both sides of the diaphragm 21 in the third direction. In this way, the spring arm portion 252 and the first magnetic circuit portion 12 are spaced apart and do not interfere with each other, which can further increase the volume of the first magnetic circuit portion 12 and further increase the size of the first voice coil 23 to further improve the driving force factor BL of the product.

[0183] In this embodiment, as Figures 9 to 12 , Figure 14 , Figure 18 and Figure 19 As shown, each first voice coil 23 is disposed within a first magnetic gap 13 and connected to the inner fixing part 253 through the frame 22. In this way, the vibration of the first voice coil 23 can be transmitted to the inner fixing part 253 of the centering support 25 and the diaphragm 21 through the frame 22. Thus, the centering support 25 plays a centering role on the vibration of the first voice coil 23, preventing the first voice coil 23 from swinging or polarizing during vibration, thereby improving the sound production effect and acoustic performance of the sound-generating unit 100.

[0184] Optionally, the top surface of the diaphragm 21 is lower than the side surface of the first magnetic circuit portion 12 facing away from the magnetic yoke 11. In this embodiment, the folded ring portion 212 of the diaphragm 21 protrudes upward, and at this time, the top surface of the folded ring portion 212 of the diaphragm 21 is lower than the side surface of the first magnetic circuit portion 12 facing away from the magnetic yoke 11.

[0185] Understandable, such as Figure 12 , Figure 14 and Figure 19 As shown, the outer fixing part 251 has two first sides and two second sides connected end to end. Each first side is sandwiched between the first magnetic circuit part 12 and the magnetic yoke 11, and at least a portion of each second side is sandwiched between the fixing part 213 and the magnetic yoke 11. The spring arm part 252 includes two parts. One end of each spring arm part 252 is connected to the second side, and the other end of each spring arm part 252 is connected to one side of the inner fixing part 253 corresponding to the second side.

[0186] In one embodiment, the inner fixing portion 253 of the centering support 25 is square ring-shaped and has four corner portions 256. Each corner portion 256 is provided with a solder pad. The frame 22 includes four components. Each first voice coil 23 is located between two frames 22. One end of each frame 22 is connected to the solder pad, and the other end of the frame 22 is connected to the first voice coil 23 and electrically connected to the lead wire of the first voice coil 23, so that the two first voice coils 23 are connected in series through the centering support 25 and the frame 22.

[0187] In one embodiment, the magnetic circuit system 1 further includes a central magnetic circuit 14, which is disposed in the accommodating space 117 and is positioned opposite to and spaced apart from the diaphragm 21 along the vibration direction of the diaphragm 21; the vibration system 2 further includes a central voice coil 24, which is disposed corresponding to the central magnetic circuit 14 and one end of the central voice coil 24 is connected to the diaphragm 21.

[0188] In this embodiment, as Figures 12 to 14 As shown, by setting a central magnetic circuit 14 within the accommodating space 117, the central magnetic circuit 14 is located within the vibration space and is positioned opposite and spaced apart from the diaphragm 21. Optionally, the projection of the central magnetic circuit 14 along the vibration direction is located within the projection range of the diaphragm 21 along the vibration direction. A central voice coil 24 is also provided, with one end connected to the diaphragm 21 and the other end suspended within the central magnetic gap 16. This further increases the magnetic field strength of the sound-generating unit 100, increases the magnetic field driving force, and further improves the BL value, thereby enhancing the acoustic performance of the sound-generating unit 100.

[0189] Understandably, the thickness of the central magnetic circuit 14 in the vibration direction of the diaphragm 21 is less than the thickness of the first magnetic circuit portion 12 in the vibration direction of the diaphragm 21. This effectively ensures that the thickness or height of the sound-generating unit 100 in the vibration direction of the diaphragm 21 is reduced. Compared with traditional sound-generating units, the sound-generating unit 100 of this application achieves both a thinner design and improved magnetic field performance, effectively increasing the BL value.

[0190] In this embodiment, optionally, the top surface of the central magnetic circuit 14 is lower than the top surfaces of the two first magnetic circuit portions 12. Optionally, along the vibration direction of the diaphragm 21, the thickness of the central magnetic circuit 14 is less than or equal to 1 / 2 the thickness of the magnetic circuit system 1.

[0191] In one embodiment, the magnetic yoke 11 further includes a plurality of upright plates 116, which are spaced apart within the accommodating space 117. The central magnetic circuit 14 is located between the plurality of upright plates 116 and is spaced apart from the upright plates 116 to form a central magnetic gap 16. One end of the central voice coil 24 is suspended in the central magnetic gap 16.

[0192] In this embodiment, as Figures 12 to 14 , Figure 16As shown, multiple vertical plates 116 are spaced apart within the receiving space 117, and the central magnetic circuit 14 is located between the multiple vertical plates 116 and spaced apart from the vertical plates 116 to form a central magnetic gap 16. It can be understood that the vertical plates 116 of the magnetic yoke 11 can be a ring structure located within the receiving space 117; or, the magnetic yoke 11 may include multiple vertical plates 116, which are spaced apart and enclosed within the receiving space 117 to form a ring structure, which is not limited here.

[0193] Optionally, the bottom wall 111 is provided with a through hole 1112 adjacent to each vertical plate 116, and each vertical plate 116 is bent into shape from the side of the bottom wall 111 adjacent to the through hole 1112 toward the cavity 113. In this way, the structural strength of the magnetic yoke 11 is improved.

[0194] In this embodiment, the magnetic yoke 11 includes two or four upright plates 116. When there are two upright plates 116, the two upright plates 116 are spaced apart along the long axis 1113 of the magnetic yoke 11; or, the two upright plates 116 are spaced apart along the short axis 1114 of the magnetic yoke 11. When there are four upright plates 116, two of the four upright plates 116 are spaced apart along the long axis 1113 of the magnetic yoke 11, and the other two upright plates 116 are spaced apart along the short axis 1114 of the magnetic yoke 11. In this case, the central magnetic circuit 14 is located between the four upright plates 116 and spaced apart from the four upright plates 116 to form a central magnetic gap 16.

[0195] Optionally, the bottom wall 111 is provided with a through hole 1112 adjacent to each vertical plate 116, and each vertical plate 116 is bent into shape from the side of the bottom wall 111 adjacent to the through hole 1112 toward the cavity 113. The sound-generating unit 100 also includes a cover plate 115, which covers the through hole 1112.

[0196] In one embodiment, the sound-generating unit 100 includes a magnetic circuit system 1 and a vibration system 2. The magnetic circuit system 1 includes a magnetic yoke 11, a central magnetic circuit 14 disposed on the magnetic yoke 11, and two first magnetic circuit portions 12. A receiving space 117 is formed between the two first magnetic circuit portions 12. The central magnetic circuit 14 is located in the receiving space 117. The vibration system 2 includes a diaphragm 21, a frame 22, a central voice coil 24, and two first voice coils 23. The diaphragm 21 is disposed in the receiving space 117 and connected to the two first magnetic circuit portions 12. The central voice coil 24 is disposed corresponding to the central magnetic circuit 14 and one end is connected to the diaphragm 21. Each first voice coil 23 is disposed corresponding to a first magnetic circuit portion 12 and is connected to the diaphragm 21 through the frame 22.

[0197] In this embodiment, as Figure 16 As shown, the central magnetic circuit 14 and the two first magnetic circuit parts 12 of the magnetic circuit system 1 share a magnetic yoke 11, thereby effectively increasing installation stability and structural consistency.

[0198] Understandably, the magnetic yoke 11 includes a bottom wall 111 and a side wall 112 arranged at an angle, with the side wall 112 and the bottom wall 111 enclosing a cavity 113. The magnetic yoke 11 also includes two side plates 114 and multiple vertical plates 116 located within the cavity 113. The two side plates 114 are spaced apart from the bottom wall 111. The accommodating space 117 is located between the two side plates 114. The side of each side plate 114 facing away from the accommodating space 117 is enclosed by the side wall 112 to form an accommodating space 1141. Each magnetic circuit assembly 121 is located within an accommodating space 1141 and is spaced apart from the side wall 112 and the side plate 114 to form a first magnetic gap 13. One end of the first voice coil 23 is suspended in the first magnetic gap 13. Multiple vertical plates 116 are spaced apart within the accommodating space 117. The central magnetic circuit 14 is located between the multiple vertical plates 116 and is spaced apart from the vertical plates 116 to form a central magnetic gap 16. One end of the central voice coil 24 is suspended in the central magnetic gap 16.

[0199] Optionally, the bottom wall 111, side plates 114, and upright plates 116 are integrally formed with the side wall 112. In this embodiment, the bottom wall 111, side walls 112, two side plates 114, and multiple upright plates 116 of the magnetic yoke 11 can be configured as an integrally formed structure, which can effectively improve the structural strength of the magnetic yoke 11. Optionally, the magnetic yoke 11 is rectangular. The multiple upright plates 116 of the magnetic yoke 11 are located between the two side plates 114. Optionally, the two side plates 114 of the magnetic yoke 11 are arranged at intervals along the long axis 1113 of the magnetic yoke 11 and extend along the short axis 1114 of the magnetic yoke 11, and are spaced apart from the side wall 112 of the short axis 1114 of the magnetic yoke 11.

[0200] Optionally, the upright plate 116 and the bottom wall 111 are integrally formed. The upright plate 116 and the bottom wall 111 are arranged perpendicularly. In this embodiment, the magnetic yoke 11 is provided with a through hole 1112 for each upright plate 116, and the upright plate 116 is optionally bent into the cavity 113 from the side of the bottom wall 111 adjacent to the through hole 1112.

[0201] Of course, in other embodiments, the central magnetic circuit 14 and the two first magnetic circuit parts 12 of the magnetic circuit system 1 may not share a single magnetic yoke 11. In this case, the magnetic yoke 11 includes multiple separately arranged lower magnetic yokes, with the central magnetic circuit 14 and the two first magnetic circuit parts 12 each corresponding to a lower magnetic yoke. This is not limited here.

[0202] In one embodiment, a central magnetic circuit 14 is disposed on a magnetically conductive yoke 11. The central magnetic circuit 14 includes a central magnet 141 and a central magnetically conductive plate 142 stacked together, with the central magnet 141 sandwiched between the magnetically conductive yoke 11 and the central magnetically conductive plate 142. The magnetically conductive yoke 11 and / or the central magnetically conductive plate 142 are provided with openings 15, and the central magnet 141 is provided with protrusions 1412 corresponding to the openings 15, with the protrusions 1412 confined within the openings 15. In this embodiment, the magnetically conductive yoke 11 can be an integrally formed structure connected to both the first magnetic circuit portion 12 and the central magnetic circuit 14, or it can be multiple separate structures connected to the first magnetic circuit portion 12 and the central magnetic circuit 14 respectively.

[0203] In this embodiment, as Figures 12 to 14 As shown, by setting the central magnetic circuit 14 as a central magnet 141 and a central magnetic plate 142 stacked together, the central magnet 141 is sandwiched between the central magnetic plate 142 and the magnetic yoke 11, and the periphery of the central magnet 141 and the central magnetic plate 142 is spaced from the vertical plate 116 to form a central magnetic gap 16.

[0204] Optionally, the central magnet 141 and the central magnetic guide plate 142 can be plate-shaped structures. Of course, in other embodiments, the central magnet 141 and the central magnetic guide plate 142 can also be configured as ring-shaped structures or multiple strip-shaped structures, etc., and are not limited here. It should be noted that the shape of the first magnetic gap 13 can be a square ring, a rectangular ring, or a racetrack shape. Similarly, the shape of the central magnetic gap 16 can be a square ring, a rectangular ring, or a racetrack shape, and is not limited here.

[0205] In this embodiment, as Figures 12 to 14 As shown, by providing openings 15 in the magnetic yoke 11 and / or the central magnetic plate 142, and providing a protrusion 1412 in the central magnet 141 corresponding to the opening 15, the protrusion 1412 is confined within the opening 15. This arrangement increases the structural strength of the central magnet 141 by providing the protrusion 1412, preventing the central magnet 141 from easily breaking during transportation, cleaning, and magnetization due to its reduced thickness.

[0206] Understandably, by providing the protrusion 1412, the thickness and structural strength of the central magnet 141 can be effectively increased, thereby improving its mass production feasibility. In this embodiment, as... Figure 12 and Figure 13 As shown, the central magnet 141 has a first surface 1411 and a second surface that are arranged opposite to each other. The first surface 1411 is connected to the central magnetic plate 142, and the second surface is connected to the magnetic yoke 11.

[0207] It should be noted that the central magnetic plate 142 is provided with an opening 15, and the first surface 1411 is provided with a protrusion 1412, which is confined within the opening 15; or, the magnetic yoke 11 is provided with an opening 15, and the second surface is provided with a protrusion 1412, which is confined within the opening 15; or, the central magnetic plate 142 is provided with an opening 15, the first surface 1411 is provided with a protrusion 1412, the magnetic yoke 11 is provided with an opening 15, and the second surface is provided with a protrusion 1412, in which case each protrusion 1412 is confined within an opening 15, which is not limited here.

[0208] Optionally, along the vibration direction of the vibration system 2, the percentage of the projected area of ​​the protrusion 1412 to the projected area of ​​the central magnet 141 is greater than or equal to 10% and less than or equal to 75%. This can effectively solve the problem that the central magnet 141 is too thin and easily breaks, and at the same time, it can improve the performance of the magnetic circuit.

[0209] In one embodiment, the top edge of the diaphragm 21 extending along the arrangement direction of the two first magnetic circuit portions 12 forms a sound outlet channel 218 between the two first magnetic circuit portions 12.

[0210] In this embodiment, as Figure 3 , Figure 6 As shown, the fixing portion 213 of the second side 217 of the diaphragm 21 is located on the same plane as the central portion 215 of the diaphragm 21. At this time, the fixing portion 213 of the second side 217 of the diaphragm 21 is lower than the top surface of the first magnetic circuit portion 12, so that a sound outlet channel 218 is formed between the fixing portion 213 of the second side 217 of the diaphragm 21 and the two first magnetic circuit portions 12. When the sound generating unit 100 is installed in the sound generating module 400 or electronic device, it is not necessary to reserve a sound guiding space in the height direction to communicate with the sound outlet channel 218, which is beneficial to the thinning design of the sound generating module 400 or electronic device.

[0211] The present invention also proposes an electronic device comprising the aforementioned sound-emitting module 400. The specific structure of the sound-emitting module 400 is as described in the foregoing embodiments. Since this electronic device employs all the technical solutions of all the foregoing embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be elaborated upon here.

[0212] It is understood that the electronic device can be headphones, mobile phones, computers, tablets, smart wearable devices, etc., and is not limited thereto. In this embodiment, the electronic device also includes a device housing, and the sound-emitting module 400 is disposed inside the device housing.

[0213] 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 module, characterized in that, The sound-generating module includes: Module housing, the module housing having a mounting cavity and a sound outlet communicating with the mounting cavity; and A sound-generating unit is disposed in the mounting cavity. The sound-generating unit includes a magnetic circuit system and a vibration system. The magnetic circuit system includes a magnetic yoke and two first magnetic circuit portions disposed on the magnetic yoke. The magnetic yoke has two long axis sides and two short axis sides connected end to end. The two first magnetic circuit portions are arranged at intervals along the extension direction of the long axis sides, and a receiving space is formed between the two first magnetic circuit portions. Each first magnetic circuit portion includes a magnetic circuit assembly. The vibration system includes a diaphragm, a frame, and two first voice coils. The diaphragm is disposed in the receiving space. Each first voice coil is disposed corresponding to one of the magnetic circuit assemblies and is connected to the diaphragm through the frame. Wherein, along the vibration direction of the diaphragm, the top surface of the diaphragm is lower than the top surface of the two first magnetic circuit portions, and a front acoustic cavity is formed between the top surface of the diaphragm and the two first magnetic circuit portions, and the front acoustic cavity is connected to the sound outlet. The magnetic yoke includes a bottom wall and a side wall arranged at an angle, the side wall and the bottom wall enclosing a cavity; the magnetic yoke also includes two side plates located within the cavity, the two side plates being spaced apart from the bottom wall, the receiving space being located between the two side plates, the side of each side plate facing away from the receiving space being enclosed with the side wall to form a receiving space, each magnetic circuit assembly being disposed within a receiving space and spaced apart from the side wall and the side plate to form a first magnetic gap, one end of the first voice coil being suspended in the first magnetic gap.

2. The sound-generating module as described in claim 1, characterized in that, The sound outlet is located on the front of the module housing and is positioned directly opposite the diaphragm. Alternatively, the sound outlet is located on the side of the module housing, and the top surface of the edge of the diaphragm extending along the arrangement direction of the two first magnetic circuit portions forms a sound outlet channel between the two first magnetic circuit portions, and the front acoustic cavity communicates with the sound outlet through the sound outlet channel.

3. The sound-generating module as described in claim 1, characterized in that, The module housing is further provided with a fixing hole corresponding to at least one of the first magnetic circuit portions, and at least a portion of the first magnetic circuit portion is located in the fixing hole to seal the fixing hole.

4. The sound-generating module as described in claim 3, characterized in that, Each of the first magnetic circuit portions further includes a cover, each cover being disposed on the side of a magnetic circuit assembly away from the magnetic yoke and connected to the magnetic yoke and / or the magnetic circuit assembly, with at least a portion of the cover located within the fixing hole to seal the fixing hole.

5. The sound-generating module as described in claim 4, characterized in that, The cover is made of a magnetically conductive material; And / or, the periphery of the cover extends toward the receiving space to form an extension, the two edges of the diaphragm located in the arrangement direction of the two magnetic circuit components are connected to the extension, and the front acoustic cavity is formed between the two covers, the diaphragm and the module housing; And / or, the side of the cover facing away from the magnetic yoke is flush with the outer surface of the module housing; And / or, the cover includes a top plate and a surrounding plate disposed around the top plate, the surrounding plate and the top plate forming a cavity, at least a portion of the magnetic circuit assembly being housed within the cavity and connected to the top plate, the surrounding plate being connected to the magnetic yoke.

6. The sound-generating module as described in claim 1, characterized in that, The module housing has mounting holes corresponding to the magnetic yoke, and at least a portion of the magnetic yoke is located within the mounting holes to seal them.

7. The sound-generating module as described in claim 6, characterized in that, The outer surface of the magnetic yoke is flush with the outer surface of the module housing.

8. The sound-generating module as described in any one of claims 1 to 7, characterized in that, The bottom wall, the side plate, and the side wall are integrally formed structures; And / or, the magnetic yoke is further provided with a leakage hole communicating with the cavity, the leakage hole including a plurality of holes, the plurality of leakage holes being spaced apart on the side wall; And / or, the bottom wall is provided with a through hole through the bottom wall adjacent to each of the side plates, and each of the side plates is bent into shape from the side of the bottom wall adjacent to the through hole toward the cavity, and the sound-emitting unit also includes a cover plate, which covers the through hole; And / or, the two edges of the diaphragm extending along the arrangement direction of the two first magnetic circuit portions are connected to the sidewall.

9. The sound-generating module as described in any one of claims 1 to 7, characterized in that, Each of the magnetic circuit components includes at least two first magnets and at least one first magnetic plate. At least two first magnets are stacked on the magnetic yoke along the vibration direction of the diaphragm, and the first magnetic plate is sandwiched between two adjacent first magnets. Furthermore, the first magnets are all magnetized along the vibration direction of the diaphragm, and the magnetization directions of two adjacent first magnets located on both sides of the first magnetic plate are opposite. And / or, along the vibration direction of the diaphragm, the height of the sound-generating unit is approximately equal to the height of the sound-generating module.

10. The sound-generating module as described in any one of claims 1 to 7, characterized in that, The diaphragm includes a central portion, a folded ring portion surrounding the central portion, and a fixing portion located outside the folded ring portion. The fixing portion is connected to the magnetic circuit system. The central portion has a hollow hole. The vibration system also includes a dome, and the dome is located at the hollow hole. And / or, the frame includes a first support portion, a first connecting portion and a second support portion connected together, the first support portion being connected to the central portion of the diaphragm, and the second support portion being connected to the first voice coil; And / or, the vibration system further includes a centering support, which includes an outer fixing part, an inner fixing part, and a spring arm part connecting the outer fixing part and the inner fixing part. The outer fixing part is connected to the magnetic yoke, the inner fixing part is connected to the frame, and is electrically connected to the first voice coil.

11. The sound-generating module as described in any one of claims 1 to 7, characterized in that, The magnetic circuit system further includes a central magnetic circuit, which is disposed in the receiving space and is positioned opposite to and spaced apart from the diaphragm along the vibration direction of the diaphragm; The vibration system also includes a central voice coil, which is arranged corresponding to the central magnetic circuit, and one end of the central voice coil is connected to the diaphragm.

12. The sound-generating module as described in claim 11, characterized in that, The central magnetic circuit is disposed on the magnetically conductive yoke, and the central magnetic circuit includes a central magnet and a central magnetically conductive plate stacked together. The central magnet is sandwiched between the magnetically conductive yoke and the central magnetically conductive plate. The magnetically conductive yoke and / or the central magnetically conductive plate are provided with an opening, and the central magnet is provided with a protrusion corresponding to the opening. The protrusion is confined within the opening. And / or, the magnetic yoke further includes a plurality of upright plates, which are spaced apart within the receiving space. The central magnetic circuit is located between the plurality of upright plates and spaced apart from the upright plates to form a central magnetic gap. One end of the central voice coil is suspended in the central magnetic gap. And / or, along the vibration direction of the diaphragm, the thickness of the central magnetic circuit is less than or equal to 1 / 2 of the thickness of the magnetic circuit system.

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

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