Sound production monomer and electronic equipment

Abstract

The invention discloses a sound production monomer and electronic equipment, and relates to the technical field of electro-acoustic transformation.The sound production monomer comprises a shell, a magnetic circuit system and a vibration system, and a containing cavity is formed in the shell; the magnetic circuit system is located in the containing cavity and comprises a magnetic conductive yoke, a center magnetic circuit and side magnetic circuits, the center magnetic circuit and the side magnetic circuits are arranged on the magnetic conductive yoke, the center magnetic circuit only comprises a center magnet, each side magnetic circuit comprises a side magnet and a side magnetic conductive plate which are arranged in a stacked mode, and the side magnets are clamped between the magnetic conductive yoke and the side magnetic conductive plates. The ratio of the thickness of the central magnet to the sum of the thicknesses of the side magnets and the side magnetic conductive plates is preferably greater than 0.7 and less than 1.3; the vibration system comprises a voice coil and a diaphragm assembly connected with the voice coil, the center magnetic circuit and the side magnetic circuits are arranged at intervals and form a magnetic gap, and at least part of the voice coil is arranged in the magnetic gap. According to the invention, a central magnetic conductive plate is omitted, a BL curve can be flatter by optimizing a magnetic circuit, and the acoustic performance of the sound production monomer can be improved while the cost is reduced.

Description

Technical Field

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

[0002] In electronic products and smart wearable devices, miniature speakers are core acoustic components in products such as mobile phones and AR / VR devices. With the development of audio technology, users are placing increasingly higher demands on the sound quality, volume, and size of miniature speakers. Currently, cost reduction is market-driven, but user demands for sound quality continue to rise. Therefore, improving acoustic performance while maintaining cost reduction has become a crucial direction. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a sound-generating unit and electronic device that reduces costs and improves acoustic performance.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: On one hand, embodiments of the present invention provide a sound-generating unit, comprising: A housing, the interior of which forms a receiving cavity; A magnetic circuit system is located within the receiving cavity. The magnetic circuit system includes a magnetic yoke and a central magnetic circuit and a side magnetic circuit disposed on the magnetic yoke. The central magnetic circuit includes only a central magnet, and the side magnetic circuit includes a side magnet and a side magnetic plate stacked together. The side magnet is sandwiched between the magnetic yoke and the side magnetic plate. A vibration system comprising a voice coil and a diaphragm assembly connected to the voice coil, wherein a central magnetic circuit and a side magnetic circuit are spaced apart and form a magnetic gap, and the voice coil is at least partially disposed in the magnetic gap.

[0005] In some embodiments of the present invention, the ratio of the thickness of the central magnet to the sum of the thicknesses of the side magnets and the side magnetic plates is greater than 0.7 and less than 1.3.

[0006] In some embodiments of the present invention, a metal connector is embedded at one end of the housing along its long axis, the end of the metal connector facing the receiving cavity is exposed on the inner surface of the housing to form a pad, and the other end of the metal connector extends from the outside of the housing to form a pin.

[0007] In some embodiments of the present invention, one end of the voice coil along its long axis is provided with two lead ends. Each lead end includes a first extension segment parallel to that end along the long axis of the voice coil, a bent segment connected to the first extension segment, a second extension segment connected to the bent segment and parallel to the first extension segment, and an oblique extension segment connected to the second extension segment. The end of the oblique extension segment near the voice coil is bonded to the housing, and the end of the oblique extension segment away from the voice coil is welded to the pad.

[0008] In some embodiments of the present invention, the ratio of the thickness of the central magnet to the sum of the thicknesses of the side magnets and the side magnetic plates is greater than 1 and less than 1.3; And / or, the inner side of the housing is provided with a relief groove near the voice coil, the oblique extension spans the relief groove, and the oblique extension is bonded to the intersection of the extension and the edge of the relief groove; And / or, the outer side of the housing is provided with a first recessed groove, the first recessed groove being a beveled surface near the inner sidewall of the voice coil, and the PIN pin being perpendicularly disposed on the beveled surface.

[0009] In some embodiments of the present invention, the diaphragm assembly includes a vibrating plate, a diaphragm connected to the outer periphery of the vibrating plate, and a metal ring connected to the outer periphery of the diaphragm, wherein the voice coil is connected to the vibrating plate; And / or, the housing has positioning protrusions at the four corners on the side near the diaphragm assembly; And / or, a sound outlet is provided on one side wall of the housing along its long axis.

[0010] In some embodiments of the present invention, the housing is provided with a second recessed groove on the side near the magnetic yoke, and a mounting platform is formed on the bottom wall of the second recessed groove. The magnetic yoke is connected to the mounting platform, and the housing is provided with a first recessed portion on the outside of the mounting platform.

[0011] In some embodiments of the present invention, the mounting platform is provided with a first protrusion, the height of which is 1μm-5μm; And / or, the housing is provided with positioning grooves at the four corners of the second recessed groove.

[0012] In some embodiments of the present invention, a second protrusion is provided at the center of the side surface of the magnetic yoke away from the diaphragm assembly, thereby forming a second recess for accommodating adhesive on the outer periphery of the second protrusion. And / or, the housing has a third recessed groove extending along its long axis on the side near the magnetic yoke, the depth of the third recessed groove being less than the depth of the second recessed groove.

[0013] On the other hand, embodiments of the present invention provide an electronic device including the aforementioned sound-emitting unit.

[0014] The present invention has the following beneficial effects: The sound-generating unit and electronic device of this invention include a housing, a magnetic circuit system, and a vibration system. The magnetic circuit system includes a magnetic yoke and a central magnetic circuit and a side magnetic circuit disposed on the magnetic yoke. The central magnetic circuit includes only a central magnet, and the side magnetic circuit includes a stacked side magnet and a side magnetic plate. The side magnet is sandwiched between the magnetic yoke and the side magnetic plate. The ratio of the thickness of the central magnet to the sum of the thicknesses of the side magnets and the side magnetic plates is greater than 0.7 and less than 1.3. Thus, on the one hand, compared with the traditional solution, eliminating the central magnetic plate can reduce BOM materials, optimize BOM costs, and improve cost competitiveness; on the other hand, optimizing the magnetic circuit can make the BL curve flatter and improve acoustic performance indicators; furthermore, removing the central magnetic plate can also reduce the risk of drop detachment, reduce assembly steps, optimize process stations, and improve production line yield. Attached Figure Description

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a top view of the sound-generating unit according to an embodiment of the present invention; Figure 2 for Figure 1 The bottom view of the sound-emitting unit shown; Figure 3 for Figure 1 The exploded structure diagram of the sound-generating unit is shown; Figure 4 for Figure 1 The top view of the sound-generating unit after removing the diaphragm assembly is shown. Figure 5 for Figure 1 The side sectional view of the sound-generating unit after the diaphragm assembly has been removed; Figure 6 for Figure 1 The image shown is a 3D view of the sound-generating unit after the diaphragm assembly has been removed. Figure 7 for Figure 1 The image shown is a 3D view of the sound-emitting unit after the magnetic yoke has been removed. Figure 8 This is a BL curve diagram of the sound-generating unit in an embodiment of the present invention.

[0016] Figure label: 100. Single-unit sound generator 1. Housing; 11. Receiving cavity; 12. Metal connector; 121. Solder pad; 122. Pin; 13. Clearance groove; 14. First recessed groove; 15. Positioning protrusion; 16. Sound outlet; 17. Second recessed groove; 171. Mounting platform; 1711. First protrusion; 172. Positioning groove; 18. First recess; 19. Beveled surface; 10. Third recessed groove. 2. Magnetic circuit system; 21. Central magnetic circuit; 211. Central magnet; 22. Side magnetic circuit; 221. Side magnet; 222. Side magnetic guide plate; 23. Magnetic yoke; 231. Second protrusion; 232. Second recess. 3. Vibration system; 31. Voice coil; 311. Lead end; 3111. First extension section; 3112. Bending section; 3113. Second extension section; 3114. Oblique extension section; 32. Diaphragm assembly; 321. Diaphragm; 322. Vibrating plate; 323. Metal ring. 4. Magnetic gap, 5. Welding points 6. Glue column. Detailed Implementation

[0017] 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.

[0018] Miniature loudspeakers typically employ three, four, or five magnetic circuit structures. To achieve a flatter bass bleed curve (BLC), magnetic metal conductors (often SPCC; the conductors further from the voice coil are called yokes, and those closer to the voice coil are called plates) are attached above and below the magnets. To reduce airflow, a large sound outlet is required, making injection-molded yokes unsuitable. The entire magnetic circuit assembly is then assembled onto the housing using the yoke. However, due to limited space, attaching smaller yokes is difficult, they are prone to detachment during drops, and using too many yokes necessitates more molds, increasing BOM costs. Currently, cost reduction is market-driven, but user demands for sound quality continue to rise. Therefore, improving acoustic performance while maintaining cost reduction has become crucial.

[0019] On the one hand, embodiments of the present invention provide a sound-generating unit 100, such as Figures 1-7As shown, the system includes a housing 1, with an internal cavity 11; and a magnetic circuit system 2 located within the cavity 11. The magnetic circuit system 2 includes a magnetic yoke 23 and a central magnetic circuit 21 and a side magnetic circuit 22 disposed on the magnetic yoke 23. The central magnetic circuit 21 includes only a central magnet 211 (i.e., the central magnetic plate is omitted), and the side magnetic circuit 22 includes stacked side magnets 221 and side magnetic plates 222, with the side magnets 221 sandwiched between the magnetic yoke 23 and the side magnetic plates 222. At this time, it is preferable to simultaneously optimize the magnetic circuit, that is: the ratio of the thickness of the central magnet 211 to the sum of the thicknesses of the side magnets 221 and the side magnetic guide plate 222 is greater than 0.7 and less than 1.3, such as 0.8, 0.9, 1.0, 1.1, 1.2, etc.; the vibration system 3 includes a voice coil 31 and a diaphragm assembly 32 connected to the voice coil 31, the central magnetic circuit 21 and the side magnetic circuit 22 are spaced apart and form a magnetic gap 4, and the voice coil 31 is at least partially disposed in the magnetic gap 4.

[0020] In the prior art, the common thickness range of magnets is 0.8-1.2 mm, and the common thickness range of magnetic conductive plates is 0.2-0.3 mm. In the embodiments of the present invention, such as... Figure 5 As shown, taking the height of the side magnetic plate 222 + side magnet 221 as a reference, denoted as 'a', the height of the central magnet 211 needs to be adjusted between 0.7a and 1.3a. This application can obtain the optimal BL value through simulation, thereby confirming the final height of the central magnet 211. In a specific example, the height of the side magnet 221 is 1mm, and the thickness of the side magnetic plate 222 is 0.25mm. Based on simulation, after removing the central magnetic plate, the thickness of the central magnet 211 increases to 1.35mm, which can improve the symmetry of the BL curve. A comparison of the optimized and unoptimized BL curves is shown below. Figure 8 As shown in the figure, the blue curve represents the BL curve before optimization, and the green curve represents the BL curve after optimization. In the example shown, cost reduction is achieved by removing the central magnetic plate and retaining only the side magnetic plates 222; and the performance is improved by optimizing the magnetic circuit and the flatness of the BL curve. This application also achieves advantages such as optimizing process steps, reducing the risk of central magnetic plate detachment, and improving production line yield. It is understood that, regardless of whether it is a five-magnetic-circuit, four-magnetic-circuit, three-magnetic-circuit, or two-magnetic-circuit system, the central magnetic plate can be omitted according to the approach provided in this application to improve the symmetry and flatness of the BL curve.

[0021] The sound-generating unit 100 of this invention includes a housing 1, a magnetic circuit system 2, and a vibration system 3. The magnetic circuit system 2 includes a magnetic yoke 23 and a central magnetic circuit 21 and a side magnetic circuit 22 disposed on the magnetic yoke 23. The central magnetic circuit 21 includes only a central magnet 211, and the side magnetic circuit 22 includes a side magnet 221 and a side magnetic plate 222 stacked together. The side magnet 221 is sandwiched between the magnetic yoke 23 and the side magnetic plate 222. The ratio of the thickness of the central magnet 211 to the sum of the thicknesses of the side magnet 221 and the side magnetic plate 222 is greater than 0.7 and less than 1.3. Thus, on the one hand, compared with the traditional solution, eliminating the central magnetic plate can reduce BOM materials, optimize BOM costs, and improve cost competitiveness; on the other hand, by optimizing the magnetic circuit, the BL curve can be flatter, improving acoustic performance indicators; furthermore, removing the central magnetic plate can also reduce the risk of drop and detachment, reduce assembly steps, optimize process stations, and improve production line yield.

[0022] In some embodiments of the present invention, the ratio of the thickness of the central magnet 211 to the sum of the thicknesses of the side magnets 221 and the side magnetic guide plate 222 can be greater than 1 and less than 1.3, such as 1.10, 1.15, 1.20, 1.25, etc. Considering that the magnetic field strength of the central magnetic circuit 21 would be insufficient after omitting the central magnetic guide plate, this setting, where the thickness of the central magnet 211 is greater than the sum of the thicknesses of the side magnets 221 and the side magnetic guide plate 222, can better improve the BL curve and enhance acoustic performance.

[0023] In some embodiments of the present invention, such as Figures 3-7 As shown, a metal connector 12 is embedded at one end of the long axis of the housing 1. The end of the metal connector 12 facing the receiving cavity 11 is exposed on the inner surface of the housing 1 to form a pad 121. The pad 121 is connected to the voice coil 31 (see solder point 5 for details). The other end of the metal connector 12 extends from the outside of the housing 1 to form a pin 122. The sound-generating unit 100 is electrically connected to the external circuit through the pin 122 to supply power to the voice coil 31. In this way, the conductive structure is realized by embedding and installing it in the housing 1, which occupies little space, saves volume, and improves the reliability of the electrical connection.

[0024] In some embodiments of the present invention, such as Figures 3-5As shown, one end of the voice coil 31 along its long axis is provided with two lead ends 311 (the two lead ends 311 can be symmetrically arranged). Each lead end 311 includes a first extension 3111 parallel to that end along the long axis of the voice coil 31, a bent section 3112 connected to the first extension 3111, a second extension 3113 connected to the bent section 3112 and parallel to the first extension 3111, and an oblique extension 3114 connected to the second extension 3113. The end of the oblique extension 3114 near the voice coil 31 is bonded to the housing 1 (see the glue post 6 for details), and the end of the oblique extension 3114 away from the voice coil 31 is soldered to the solder pad 121 (see the solder point 5 for details). Thus, the voice coil 31 adopts a suspended lead design, and is electrically connected to the metal connector 12 embedded in the housing 1 through the lead end 311. The lead end 311 is designed with a multi-segment bending structure, which can effectively buffer the tensile and torsional stress generated when the voice coil 31 vibrates, avoid stress being directly transmitted to the welding point 5, and further improve the reliability of the electrical connection.

[0025] In some embodiments of the present invention, such as Figures 4-6 As shown, a clearance groove 13 is provided on the inner side of the housing 1 near the voice coil 31. An obliquely extending section 3114 spans the clearance groove 13, and is bonded to the intersection of the obliquely extending section 3114 and the edge of the clearance groove 13 (specifically, the bonding is achieved through adhesive posts 6). Thus, the clearance groove 13 prevents interference between the obliquely extending section 3114 and the housing 1, thus avoiding interference with the vibration of the voice coil 31 and ensuring sound quality. Figure 7 As shown, the outer side of the housing 1 may also be provided with a first recessed groove 14. The inner wall of the first recessed groove 14 near the voice coil 31 is a beveled surface 19. The PIN pin 122 is vertically disposed on the beveled surface 19. In this way, the PIN pin 122 is inclined, which can maximize the length of the PIN pin 122 and facilitate electrical connection with external circuits. At the same time, the first recessed groove 14 and the beveled surface 19 can provide sufficient space to install the PIN pin 122, so that the PIN pin 122 does not protrude outward from the housing 1, reducing the space occupied by the sound-generating unit 100.

[0026] In some embodiments of the present invention, such as Figure 1 and Figure 3 As shown, the diaphragm assembly 32 includes a vibrating plate 322, a diaphragm 321 connected to the outer periphery of the vibrating plate 322, and a metal ring 323 (specifically a steel ring) connected to the outer periphery of the diaphragm 321. The voice coil 32 (suspended) is connected to the vibrating plate 322. Thus, this embodiment eliminates the need for a centering support. The voice coil 32 is suspended in the diaphragm assembly 32, and the metal ring 323 on the outer periphery of the diaphragm 321 increases the suspension stability of the voice coil 32 and improves the acoustic performance of the sound-generating unit 100. Figure 1 , Figure 4 and Figure 6As shown, the housing 1 may have positioning protrusions 15 at the four corners on the side near the diaphragm assembly 32 to facilitate the positioning and installation of the diaphragm assembly 32.

[0027] In some embodiments of the present invention, such as Figure 3 and Figure 7 As shown, a sound outlet 16 is provided on one side wall along the long axis of the housing 1. Because this application adopts a suspended magnetic circuit design, that is, the central magnet 211, the side magnet 221 and the side magnetic guide plate 222 are fixed (specifically, they can be glued or welded) on the magnetic guide yoke 23, and the entire magnetic circuit system 2 is finally assembled on the housing 1. Compared with the existing injection-molded magnetic guide plate solution (the injection-molded magnetic guide plate solution will make the sound outlet smaller because the plastic has to wrap the magnetic guide plate), this design can maximize the sound outlet 16, reduce the air flow rate, and thus improve the sound production effect.

[0028] In some embodiments of the present invention, such as Figure 7 As shown, the housing 1 has a second recessed groove 17 on the side near the magnetic yoke 23, and a mounting platform 171 is formed on the bottom wall of the second recessed groove 17. The magnetic yoke 23 is connected to the mounting platform 171, and the housing 1 has a first recessed portion 18 on the outer side of the mounting platform 171. Specifically, the magnetic yoke 23 can be bonded to the mounting platform 171, and the first recessed portion 18 can accommodate overflowing adhesive, thereby achieving a tight and secure installation of the magnetic yoke 23 and the housing 1. Furthermore, the mounting platform 171 can be provided with a first protrusion 1711, the height of which is 1μm-5μm, such as 2μm, 3μm, 4μm, etc. This allows for better control of the adhesive layer thickness on the mounting platform 171, ensuring the firmness and airtightness of the connection between the magnetic yoke 23 and the housing 1. In addition, the housing 1 may be provided with positioning grooves 172 at the four corners of the second recessed groove 17. When the diaphragm assembly 32 is assembled into the housing 1, the positioning grooves 172 can cooperate with the positioning fixture to temporarily fix the housing 1.

[0029] In some embodiments of the present invention, such as Figures 2-3 As shown, a second protrusion 231 is provided in the middle of the side surface of the magnetic yoke 23 away from the diaphragm assembly 32, thereby forming a second recess 232 for accommodating adhesive on the outer periphery of the second protrusion 231. The area ratio of the second recess 232 to the area of ​​the magnetic yoke 23 is 1%-10%, such as 3%, 5%, 8%, etc. In use, after the magnetic yoke 23 is bonded to the mounting platform 171, additional adhesive can be applied to the second recess 232 to bond the sidewall of the magnetic yoke 23 to the sidewall of the second recess 17, further improving the connection firmness of the magnetic yoke 23, especially improving the adhesive airtightness of the magnetic yoke 23.

[0030] In some embodiments of the present invention, the following continues... Figure 7As shown, the housing 1 has a third recessed groove 10 extending along the long axis on the side near the magnetic yoke 23. The depth of the third recessed groove 10 is less than the depth of the second recessed groove 17. In this way, the step between the second recessed groove 17 and the third recessed groove 10 can position the magnetic yoke 23 along the long axis, which facilitates the positioning and assembly of the magnetic yoke 23. At the same time, the third recessed groove 10 can prevent the magnetic yoke 23 from protruding from the outer surface of the housing 1, thereby reducing the overall volume of the sound-generating unit 100.

[0031] The assembly process of the sound-generating unit 100 in this embodiment of the invention can be referred to as follows: First, the voice coil 31 is placed inside the housing 1, and the two lead ends 311 of the voice coil 31 are connected to the housing 1 by adhesive and welding, thereby assembling the voice coil 31 and the housing 1 to obtain the voice coil & housing assembly; then, the prepared diaphragm & steel ring assembly (i.e., diaphragm assembly 32) is glued to the voice coil & housing assembly to obtain the diaphragm & housing assembly; at the same time, the magnetic yoke 23, each magnet and the corresponding magnetic plate are assembled into a magnetic circuit assembly; finally, the magnetic circuit assembly and the diaphragm & housing assembly are combined to obtain the finished sound-generating unit 100.

[0032] On the other hand, embodiments of the present invention provide an electronic device including the aforementioned sound-emitting unit 100. The structure of the sound-emitting unit 100 is the same as described above, and will not be repeated here. The electronic device may be a mobile phone, watch, tablet computer, smart wearable device, virtual reality device, or augmented reality device, etc.

[0033] Since the electronic device proposed in this application applies all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought by all the foregoing technical solutions, which will not be elaborated here.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A sound-emitting monomer, characterized in that, include: A housing, the interior of which forms a receiving cavity; A magnetic circuit system is located within the receiving cavity. The magnetic circuit system includes a magnetic yoke and a central magnetic circuit and a side magnetic circuit disposed on the magnetic yoke. The central magnetic circuit includes only a central magnet, and the side magnetic circuit includes a side magnet and a side magnetic plate stacked together. The side magnet is sandwiched between the magnetic yoke and the side magnetic plate. A vibration system comprising a voice coil and a diaphragm assembly connected to the voice coil, wherein a central magnetic circuit and a side magnetic circuit are spaced apart and form a magnetic gap, and the voice coil is at least partially disposed in the magnetic gap.

2. The sound-generating unit according to claim 1, characterized in that, The ratio of the thickness of the central magnet to the sum of the thicknesses of the side magnets and the side magnetic plates is greater than 0.7 and less than 1.

3.

3. The sound-generating unit according to claim 1, characterized in that, A metal connector is embedded at one end of the housing along its long axis. The end of the metal connector facing the cavity is exposed on the inner surface of the housing to form a solder pad. The other end of the metal connector extends from the outside of the housing to form a pin.

4. The sound-generating unit according to claim 3, characterized in that, The voice coil has two lead ends at one end along its long axis. Each lead end includes a first extension parallel to that end along the long axis of the voice coil, a bent section connected to the first extension, a second extension connected to the bent section and parallel to the first extension, and an oblique extension connected to the second extension. The end of the oblique extension near the voice coil is bonded to the housing, and the end of the oblique extension away from the voice coil is soldered to the pad.

5. The sound-generating unit according to claim 4, characterized in that, The ratio of the thickness of the central magnet to the sum of the thicknesses of the side magnets and the side magnetic plates is greater than 1 and less than 1.

3. And / or, the inner side of the housing is provided with a relief groove near the voice coil, the oblique extension spans the relief groove, and the oblique extension is bonded to the intersection of the extension and the edge of the relief groove; And / or, the outer side of the housing is provided with a first recessed groove, the first recessed groove being a beveled surface near the inner sidewall of the voice coil, and the PIN pin being perpendicularly disposed on the beveled surface.

6. The sound-generating unit according to claim 1, characterized in that, The diaphragm assembly includes a vibrating plate, a diaphragm connected to the outer periphery of the vibrating plate, and a metal ring connected to the outer periphery of the diaphragm, wherein the voice coil is connected to the vibrating plate; And / or, the housing has positioning protrusions at the four corners on the side near the diaphragm assembly; And / or, a sound outlet is provided on one side wall of the housing along its long axis.

7. The sound-generating unit according to any one of claims 1-6, characterized in that, The housing has a second recessed groove on the side near the magnetic yoke, and a mounting platform is formed on the bottom wall of the second recessed groove. The magnetic yoke is connected to the mounting platform, and the housing has a first recessed portion on the outside of the mounting platform.

8. The sound-generating unit according to claim 7, characterized in that, The mounting platform is provided with a first protrusion, the height of which is 1μm-5μm; And / or, the housing is provided with positioning grooves at the four corners of the second recessed groove.

9. The sound-generating unit according to claim 7, characterized in that, The magnetic yoke has a second protrusion at the center of the side surface away from the diaphragm assembly, thereby forming a second recess on the outer periphery of the second protrusion for accommodating adhesive. And / or, the housing has a third recessed groove extending along its long axis on the side near the magnetic yoke, the depth of the third recessed groove being less than the depth of the second recessed groove.

10. An electronic device, characterized in that, Includes the sound-generating monomer described in any one of claims 1-9.

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