Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a magnetic circuit system of the sound production device is provided with a magnetic gap, a diaphragm assembly of a vibration system is opposite to the magnetic circuit system, and a voice coil is suspended in the magnetic gap; wherein the voice coil comprises two first side edges and two second side edges which are connected end to end, the two first side edges are oppositely arranged and are sunken towards the inner side of the voice coil to form a first sunken part, and the two second side edges are oppositely arranged and are sunken towards the inner side of the voice coil to form a second sunken part; the two first concave parts and the two second concave parts define a first area, a second area is formed between the adjacent first concave part and second concave part, and the magnetic circuit system is provided with a first magnetic part located in the first area and a second magnetic part located in the second area. According to the sound production device, the size of the voice coil and the magnet volume of the magnetic circuit system are increased, so that the BL value is improved, and the whole machine performance and the sound effect loudness are improved.

Description

Technical Field

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

[0002] In recent years, with the rapid development of consumer electronic products, electronic devices such as smart phones and VR devices have been recognized by consumers and widely used. Those skilled in the art have also made corresponding improvements to related supporting products such as headphones to meet the performance requirements of electronic products and meet the needs of consumers for product performance.

[0003] The sound-generating device is an important electroacoustic transducer component in consumer electronic products. It is widely used as a speaker, receiver, earphone, etc. With the improvement of the performance of electronic products, the improvement of the acoustic performance of the sound-generating device is also an inevitable trend. In order to achieve better acoustic performance, the sound-generating device often needs to be equipped with a larger magnetic circuit system with stronger magnetic field strength.

[0004] In the related art, the box space of electronic products is getting smaller and smaller, which results in the size of the magnetic circuit system in the sound-generating device being limited and unable to be enlarged, thereby reducing the magnetic field strength of the magnetic circuit system, reducing the BL value, and affecting the acoustic performance of the sound-generating device. Summary of the invention

[0005] The main purpose of the present invention is to provide a sound-generating device and an electronic device, aiming to provide a sound-generating device that effectively improves the BL value. The sound-generating device increases the BL value by increasing the voice coil size, thereby improving the overall performance and sound loudness of the device.

[0006] To achieve the above object, the present invention provides a sound-generating device, comprising:

[0007] shell;

[0008] A magnetic circuit system, the magnetic circuit system is connected to the housing, and the magnetic circuit system is provided with a magnetic gap; and

[0009] A vibration system, the vibration system comprising a diaphragm assembly and a voice coil, wherein the periphery of the diaphragm assembly is connected to the housing and is opposite to the magnetic circuit system, one end of the voice coil is connected to the diaphragm assembly, and the other end of the voice coil is suspended in the magnetic gap;

[0010] Wherein, the voice coil includes two first sides and two second sides connected end to end, the two first sides are arranged opposite to each other, and the two first sides are recessed toward the inner side of the voice coil to form a first recessed portion, the two second sides are arranged opposite to each other, and the two second sides are recessed toward the inner side of the voice coil to form a second recessed portion, the two first recessed portions and the two second recessed portions are enclosed to form a first area, and a second area is formed between adjacent first recessed portions and second recessed portions, and the magnetic circuit system is provided with a first magnetic portion located in the first area and a second magnetic portion located in the second area.

[0011] In one embodiment, the magnetic circuit system includes a magnetic yoke and a central magnetic portion, two common magnetic portions and two side magnetic portions arranged on the magnetic yoke, the central magnetic portion includes the first magnetic portion and the second magnetic portion, the two common magnetic portions correspond to the two first recessed portions respectively, and are spaced from the first magnetic portion and the second magnetic portion to form a first magnetic gap, the two side magnetic portions correspond to the two second recessed portions respectively, and are spaced from the first magnetic portion and the second magnetic portion to form a second magnetic gap, and the first magnetic gap and the second magnetic gap cooperate to form the magnetic gap.

[0012] In one embodiment, the housing has two first extending sides extending along a first direction and two second extending sides extending along a second direction, each of the first sides corresponds to one of the second extending sides, and each of the second sides corresponds to one of the first extending sides;

[0013] The two common magnetic portions both extend along the first direction and are located at opposite sides of the first magnetic portion along the first direction;

[0014] The two edge magnets are respectively arranged corresponding to the two first extension edges, and each edge magnet comprises a main body extending along the first direction and a protruding portion protruding from the main body toward the second recessed portion;

[0015] Wherein, the first direction and the second direction are arranged at an angle.

[0016] In one embodiment, along the second direction, the two protrusions are located on opposite sides of the first magnetic portion and are arranged directly opposite to the first magnetic portion;

[0017] And / or, the two edge magnetic parts are symmetrically arranged with the first magnetic part as the symmetry axis;

[0018] And / or, the two common magnetic parts are symmetrically arranged with the first magnetic part as the symmetry axis;

[0019] And / or, along the second direction, each of the common magnetic portions is located between two of the second magnetic portions;

[0020] And / or, along the first direction, each of the protruding portions is located between two of the second magnetic portions, and the two second magnetic portions are symmetrically arranged with the protruding portion as a symmetry axis.

[0021] In one embodiment, each of the first recessed portions includes a first section, a second section, and a third section connected in sequence, one end of the first section and the third section away from the second section is connected to the first side, and two second sections are located on opposite sides of the first magnetic portion along the first direction;

[0022] Each of the second recessed portions comprises a first side, a second side and a third side connected in sequence, one end of the first side and the third side away from the second side is connected to the second side, and the two second sides are located at opposite sides of the first magnetic portion along the second direction;

[0023] The two second sections and the two second sides enclose the first area.

[0024] In one embodiment, along the second direction, the first section and the third section are opposite and spaced apart, so that the first section, the second section and the third section enclose a first recessed area, and each of the common magnetic portions is located in one of the first recessed areas;

[0025] And / or, the connection between the first section and the first side is a smooth transition connection;

[0026] And / or, the connection between the third section and the first side is in a smooth transition connection;

[0027] And / or, the connection between the first section and the second section is a smooth transition connection;

[0028] And / or, the connection between the third section and the second section is a smooth transition connection;

[0029] And / or, the connection between the first side and the second side is a smooth transition connection;

[0030] And / or, along the first direction, the first side and the third side are opposite and spaced apart, so that the first side, the second side and the third side enclose a second recessed area, and each of the protruding portions is located in one of the second recessed areas;

[0031] And / or, the connection between the first side and the second side is a smooth transition connection;

[0032] And / or, the connection between the third side and the second side is a smooth transition connection;

[0033] And / or, the connection between the first side and the second side is a smooth transition connection;

[0034] And / or, the connection between the third side and the second side is a smooth transition connection.

[0035] In one embodiment, the two first recessed portions are symmetrically arranged with the first magnetic portion as a symmetry axis;

[0036] And / or, the two second recessed portions are symmetrically arranged with the first magnetic portion as a symmetry axis;

[0037] And / or, each of the first recessed portions is located in the middle of one of the first side edges;

[0038] And / or, each of the second recessed portions is located in the middle of a second side edge.

[0039] In one embodiment, the adjacent first recessed portions and the second recessed portions are spaced apart to form a communication port connecting the first region and the second region;

[0040] Or, the adjacent first recessed portions and the second recessed portions are in abutment with each other;

[0041] Alternatively, the adjacent first recessed portions and the second recessed portions are spaced apart to form a connecting opening connecting the first region and the second region, and the central magnetic portion further includes a connecting portion connecting the first magnetic portion and the second magnetic portion, and the connecting portion is located within the connecting opening.

[0042] In one embodiment, each of the edge magnetic parts includes a stacked edge magnet and an edge magnetic conductive plate, the edge magnet is connected to the magnetic conductive yoke, and the edge magnetic conductive plate and the housing are an integrally formed structure;

[0043] And / or, each of the common magnetic parts comprises a common magnet and a common magnetic conductive plate which are stacked, and the common magnet is connected to the magnetic conductive yoke;

[0044] And / or, the first magnetic part includes a first central magnet and a first central magnetic conductive plate which are stacked, and the first central magnet is connected to the magnetic conductive yoke;

[0045] And / or, each of the second magnetic parts includes a second central magnet and a second central magnetic conductive plate which are stacked, and the second central magnet is connected to the magnetic conductive yoke.

[0046] Elastic Arm The present invention further provides an electronic device, characterized in that the electronic device comprises the above-mentioned sound-generating device.

[0047] The sound-generating device of the technical solution of the present invention is achieved by accommodating a vibration system and a magnetic circuit system in a housing, and setting a magnetic gap in the magnetic circuit system, and setting the vibration system as a diaphragm assembly and a voice coil connected to the diaphragm assembly, so that the periphery of the diaphragm assembly is connected to the housing, one end of the voice coil is connected to the diaphragm assembly, and the other end of the voice coil is suspended in the magnetic gap, so that current is passed through the voice coil, so that the voice coil converts electrical energy into mechanical energy in the magnetic gap formed by the magnetic circuit system, so as to drive the voice coil to drive the diaphragm assembly to vibrate, thereby achieving sound generation; at the same time, by setting the voice coil as two first sides and two second sides connected end to end, the two first sides are arranged opposite to each other, and the two first sides are both facing the sound. The inner side of the coil is recessed to form a first recessed portion, and the two second sides are arranged opposite to each other, and the two second sides are recessed toward the inner side of the voice coil to form a second recessed portion, thereby effectively increasing the total length of the voice coil and improving the L value of the voice coil. The two first recessed portions and the two second recessed portions enclose a first area, and a second area is formed between adjacent first recessed portions and second recessed portions. The first magnetic portion located in the first area and the second magnetic portion located in the second area are arranged through the magnetic circuit system, which can effectively increase the volume of the magnet of the magnetic circuit system, thereby increasing the magnetic field strength of the magnetic circuit system, so that when the voice coil vibrates in the magnetic field formed by the magnetic circuit system, the BL value is effectively improved, thereby improving the performance of the whole machine and the loudness of the sound effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0049] Figure 1 A schematic diagram of a top view of the structure of an embodiment of a sound-generating device provided by the present invention;

[0050] Figure 2 A bottom-up structural schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0051] Figure 3 A schematic cross-sectional view of a common magnetic portion of an embodiment of a sound-generating device provided by the present invention;

[0052] Figure 4 An exploded schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0053] Figure 5 A schematic structural diagram of an embodiment of a sound-generating device provided by the present invention without the magnetic yoke;

[0054] Figure 6A partial structural schematic diagram of the magnetic circuit system provided by the present invention;

[0055] Figure 7 A schematic structural diagram of an embodiment of a voice coil provided by the present invention;

[0056] Figure 8 This is a comparison chart of the FR curves of the sound-generating device provided by the present invention and the prior art.

[0057] Description of Figure Numbers:

[0058] 100. Sound-generating device; 1. Shell; 11. First extended edge; 12. Second extended edge; 13. Corner; 2. Magnetic circuit system; 21. Magnetic yoke; 22. Center magnetic part; 221. First magnetic part; 2211. First center magnet; 2212. First center magnetic plate; 222. Second magnetic part; 2221. Second center magnet; 2222. Second center magnetic plate; 23. Side magnetic part; 231. Side magnet; 232. Side magnetic plate; 233. Main body; 234. Protrusion; 235. Second magnetic gap; 24. Common magnetic part; 241. Common magnet; 242. Common magnetic plate; 243. First magnetic gap; 25. Magnetic gap; 3. Vibration system; 31. Diaphragm assembly; 311 , diaphragm; 3111, inner ring; 3112, folded ring; 3113, fixed part; 3114, bent part; 312, vibration plate; 32, voice coil; 321, first side; 322, first recessed part; 3221, first section; 3222, second section; 3223, third section; 3224, first recessed area; 323, second side; 324, second recessed part; 3241, first side; 3242, second side; 3243, third side; 3244, second recessed area; 325, first area; 326, second area; 327, connecting port; 33, centering support piece; 331, external connection part; 332, internal connection part; 333, elastic arm part; 334, external welding pad.

[0059] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0062] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0063] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0064] In recent years, with the rapid development of consumer electronic products, electronic devices such as smart phones and VR devices have been recognized by consumers and widely used. Those skilled in the art have also made corresponding improvements to related supporting products such as headphones to meet the performance requirements of electronic products and meet consumers' needs for product performance.

[0065] The sound-generating device is an important electroacoustic transducer component in consumer electronic products. It is widely used as a speaker, receiver, earphone, etc. With the improvement of the performance of electronic products, the improvement of the acoustic performance of the sound-generating device is also an inevitable trend. In order to achieve better acoustic performance, the sound-generating device often needs to be equipped with a larger magnetic circuit system with stronger magnetic field strength.

[0066] In the related art, the box space of electronic products is getting smaller and smaller, which results in the size of the magnetic circuit system in the sound device being limited and unable to be enlarged, thereby reducing the magnetic field strength of the magnetic circuit system, reducing the BL value, and affecting the acoustic performance of the sound device. Therefore, how to achieve the best sound effect in an effective space is the pursuit of the application of sound devices.

[0067] Based on the above concepts and problems, the present invention proposes a sound-generating device 100. It is understandable that the sound-generating device 100 is applied to electronic devices, and the electronic devices may be mobile phones, headphones, smart wearable devices, tablet computers, laptop computers, etc., which are not limited here. In this embodiment, the sound-generating device 100 of the present invention adopts a special-shaped voice coil structure under limited space conditions, increases the total length of the voice coil 32, increases the L value of the voice coil 32, and adjusts the structure of the magnetic circuit system 2 according to the special-shaped voice coil design, thereby effectively increasing the magnet volume of the magnetic circuit system 2 to increase the BL value, thereby greatly improving the overall performance and sound loudness.

[0068] Please refer to Figures 1 to 7 As shown, in the embodiment of the present invention, the sound-generating device 100 includes a housing 1, a magnetic circuit system 2 and a vibration system 3, the magnetic circuit system 2 is connected to the housing 1, the magnetic circuit system 2 is provided with a magnetic gap 25, the vibration system 3 includes a diaphragm assembly 31 and a voice coil 32, the periphery of the diaphragm assembly 31 is connected to the housing 1 and is opposite to the magnetic circuit system 2, one end of the voice coil 32 is connected to the diaphragm assembly 31, and the other end of the voice coil 32 is suspended in the magnetic gap 25; wherein the voice coil 32 includes two first side edges 321 and two second side edges 323 connected end to end, the two first side edges 321 are arranged opposite to each other The two first sides 321 are recessed toward the inner side of the voice coil 32 to form a first recessed portion 322, the two second sides 323 are relatively arranged, and the two second sides 323 are recessed toward the inner side of the voice coil 32 to form a second recessed portion 324, the two first recessed portions 322 and the two second recessed portions 324 enclose a first area 325, and a second area 326 is formed between adjacent first recessed portions 322 and second recessed portions 324, and the magnetic circuit system 2 is provided with a first magnetic portion 221 located in the first area 325 and a second magnetic portion 222 located in the second area 326.

[0069] In this embodiment, the sound-generating device 100 may be a sound-generating unit of a speaker, and the speaker may be a micro speaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 are arranged opposite to each other.

[0070] In order to better assemble the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100. In one embodiment, as Figures 2 to 5 As shown, the sound generating device 100 further includes a housing 1 , a magnetic circuit system 2 connected to one end of the housing 1 , and a vibration system 3 connected to the other end of the housing 1 and arranged opposite to the magnetic circuit system 2 .

[0071] It should be noted that the housing 1 is used to install, fix and support components such as the magnetic circuit system 2 and the vibration system 3, that is, the housing 1 provides an installation base for components such as the magnetic circuit system 2 and the vibration system 3. It can be understood that the housing 1 can be an integral structure or can be formed by the cooperation of multiple split structures, which is not limited here. The housing 1 in this embodiment can be selected as a square frame or frame structure, that is, the housing 1 has a cavity with openings at both ends, and the magnetic circuit system 2 and the vibration system 3 are respectively connected to the two sides of the housing 1, and are arranged relative to each other, so that the magnetic circuit system 2, the housing 1 and the diaphragm 311 of the vibration system 3 enclose a vibration cavity.

[0072] It can be understood that the sound-generating device 100 is applied to electronic devices, that is, the sound-generating device 100 can be installed in the electronic device through the housing 1. It should be noted that the housing 1 of the sound-generating device 100 can be a housing or box structure independent of the electronic device. In this case, the housing 1 is used to integrate the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 into an integral structure, so as to facilitate disassembly and assembly. Of course, the housing 1 of the sound-generating device 100 can also be an integrally formed structure with the housing or box structure of the electronic device, which can effectively improve the structural strength and sealing performance.

[0073] In this embodiment, the housing 1 is used to accommodate and fix the vibration system 3 and the magnetic circuit system 2 and other structures, so that the sound device 100 can be used as an independent component in an electronic device or a sound module, which is not limited here. Of course, in other embodiments, the sound device 100 can also be a module structure, in which case the vibration system 3 and the magnetic circuit system 2 and other structures of the sound unit are installed as multiple independent components on the housing 1 of the module structure, which is not limited here.

[0074] Optionally, the sound-generating device 100 is arranged in a rectangular shape. In this embodiment, the housing 1 of the sound-generating device 100 is optionally arranged in a rectangular shape. Figure 4 As shown, the housing 1 has two first extending edges 11 and two second extending edges 12 connected end to end, the two first extending edges 11 and the two second extending edges 12 enclose a rectangular frame structure, and the connection between the first extending edges 11 and the second extending edges 12 forms a corner 13.

[0075] Optionally, the first extension side 11 of the housing 1 extends along the first direction, the second extension side 12 extends along the second direction, and the first direction and the second direction are arranged at an angle. In this embodiment, the first extension side 11 and the second extension side 12 of the housing 1 are arranged at an angle, and an angle 13 is formed at the connection between the first extension side 11 and the second extension side 12. Optionally, the first direction and the second direction are arranged perpendicularly, that is, the first extension side 11 and the second extension side 12 of the housing 1 are arranged perpendicularly, and the housing 1 has a rectangular frame structure.

[0076] In this embodiment, the diaphragm assembly 31 of the vibration system 3 may be arranged in a square shape. The periphery of the diaphragm assembly 31 is connected to one end of the housing 1 , and the edge magnetic part 23 or the magnetic yoke 21 of the magnetic circuit system 2 is connected to the other end of the housing 1 .

[0077] Understandable, such as Figure 1 , Figure 3 , Figure 4 As shown, the diaphragm assembly 31 includes a diaphragm 311 and a vibration plate 312. The diaphragm 311 includes an inner ring portion 3111, a folded ring portion 3112 and a fixed portion 3113 which are connected in sequence from the inside to the outside. The inner ring portion 3111 is connected to the vibration plate 312, the fixed portion 3113 is connected to the outer shell 1, and the voice coil 32 is connected to the vibration plate 312.

[0078] It should be noted that the diaphragm 311 and the vibration plate 312 of the diaphragm assembly 31 may be integrally formed structural parts, such as integrally injection molded or integrally processed, etc., which is not limited here. Of course, in other embodiments, the diaphragm 311 and the vibration plate 312 of the diaphragm assembly 31 may be separate structures, in which case the vibration plate 312 and the inner ring portion 3111 of the diaphragm 311 may be connected by bonding, which is not limited here.

[0079] In order to further improve the connection stability and waterproof sealing performance between the diaphragm 311 and the housing 1, the outer periphery of the diaphragm 311 is bent and extended toward the housing 1 to form a bent portion 3114, and the bent portion 3114 is connected to the outer wall of the housing 1. In this embodiment, the bent portion 3114 is formed by bending and extending the outer periphery of the fixing portion 3113 of the diaphragm 311 toward the housing 1. Optionally, the inner ring portion 3111, the folded ring portion 3112, the fixing portion 3113 and the bent portion 3114 of the diaphragm 311 are an integrally formed structure.

[0080] In order to adjust the position of the voice coil 32 in the magnetic gap 25, in one embodiment, the vibration plate 312 is provided with a protrusion toward the voice coil 32, one end of the voice coil 32 is connected to the protrusion, and the other end of the voice coil 32 is suspended in the magnetic gap 25. In this way, the voice coil 32 can be placed at a suitable position in the magnetic gap 25 through the protrusion of the vibration plate 312, ensuring that the magnetic flux lines in the magnetic gap 25 pass through the voice coil 32.

[0081] It should be noted that in the related art, the sound-generating device 100 is limited by the box space of the electronic product, resulting in that the size of the magnetic circuit system 2 in the sound-generating device 100 is limited and cannot be increased, thereby reducing the magnetic field strength of the magnetic circuit system, reducing the BL value, and affecting the acoustic performance of the sound-generating device.

[0082] In this embodiment, the voice coil 32 is provided with two first side edges 321 and two second side edges 323 connected end to end, so that the two first side edges 321 are arranged opposite to each other, and the two first side edges 321 are both recessed toward the inner side of the voice coil 32 to form a first recessed portion 322, and the two second side edges 323 are arranged opposite to each other, and the two second side edges 323 are both recessed toward the inner side of the voice coil 32 to form a second recessed portion 324, thereby effectively increasing the total length of the voice coil 32, increasing the L value of the voice coil, and improving the BL value, thereby greatly improving the performance of the whole machine and the sound effect loudness, such as Figure 8 As shown, it can be understood that the sound-generating device 100 of the present invention increases the actual simulated BL value from 0.97 to 1.27 by setting the voice coil 32 as a special-shaped voice coil, compared with the conventional loudspeaker in the prior art, and the BL value is significantly improved.

[0083] It can be understood that by setting a magnetic gap 25 in the magnetic circuit system 2, and enclosing the first area 325 between the two first recessed parts 322 and the two second recessed parts 324, and forming a second area 326 between the adjacent first recessed parts 322 and the second recessed parts 324, the magnetic circuit system 2 is provided with a first magnetic part 221 located in the first area 325 and a second magnetic part 222 located in the second area 326, so that the magnet volume of the magnetic circuit system 2 can be effectively increased, thereby increasing the magnetic field strength of the magnetic circuit system 2, so that the voice coil 32 can effectively increase the BL value when vibrating in the magnetic field formed by the magnetic circuit system 2, thereby improving the performance of the whole machine and the sound effect loudness. At the same time, one end of the voice coil 32 is connected to the diaphragm assembly 31, and the other end of the voice coil 32 is suspended in the magnetic gap 25. In this way, current is passed into the voice coil 32, so that the voice coil 32 converts electrical energy into mechanical energy in the magnetic gap 25 formed by the magnetic circuit system 2, so as to drive the voice coil 32 to drive the diaphragm 311 to vibrate, thereby achieving sound generation.

[0084] The sound-generating device 100 of the present invention is configured such that the vibration system 3 and the magnetic circuit system 2 are housed in the housing 1, a magnetic gap 25 is set in the magnetic circuit system 2, and the vibration system 3 is configured as a diaphragm assembly 31 and a voice coil 32 connected to the diaphragm assembly 31, so that the periphery of the diaphragm assembly 31 is connected to the housing 1, one end of the voice coil 32 is connected to the diaphragm assembly 31, and the other end of the voice coil 32 is suspended in the magnetic gap 25. In this way, current is passed through the voice coil 32, so that the voice coil 32 converts electrical energy into mechanical energy in the magnetic gap 25 formed by the magnetic circuit system 2, so as to drive the voice coil 32 to drive the diaphragm assembly 31 to vibrate, thereby achieving sound generation; at the same time, by configuring the voice coil 32 to have two first side edges 321 and two second side edges 323 connected end to end, the two first side edges 321 are arranged opposite to each other, and the two first side edges 321 are both facing the inside of the voice coil 32. The side recess forms a first recessed portion 322, and the two second side edges 323 are arranged opposite to each other, and the two second side edges 323 are recessed toward the inner side of the voice coil 32 to form a second recessed portion 324, thereby effectively increasing the total length of the voice coil 32 and improving the L value of the voice coil 32. The two first recessed portions 322 and the two second recessed portions 324 enclose a first area 325, and a second area 326 is formed between the adjacent first recessed portions 322 and the second recessed portions 324. The first magnetic portion 221 located in the first area 325 and the second magnetic portion 222 located in the second area 326 are arranged through the magnetic circuit system 2. In this way, the magnet volume of the magnetic circuit system 2 can be effectively increased, thereby increasing the magnetic field strength of the magnetic circuit system 2, so that when the voice coil 32 vibrates in the magnetic field formed by the magnetic circuit system 2, the BL value is effectively improved, thereby improving the overall performance and sound loudness of the machine.

[0085] In one embodiment, the magnetic circuit system 2 includes a magnetic yoke 21 and a central magnetic portion 22, two common magnetic portions 24 and two side magnetic portions 23 arranged on the magnetic yoke 21. The central magnetic portion 22 includes a first magnetic portion 221 and a second magnetic portion 222. The two common magnetic portions 24 correspond to two first recessed portions 322, respectively, and are spaced from the first magnetic portion 221 and the second magnetic portion 222 to form a first magnetic gap 243. The two side magnetic portions 23 correspond to two second recessed portions 324, respectively, and are spaced from the first magnetic portion 221 and the second magnetic portion 222 to form a second magnetic gap 235. The first magnetic gap 243 and the second magnetic gap 235 cooperate to form a magnetic gap 25.

[0086] In this embodiment, if Figures 2 to 6As shown, by setting the magnetic circuit system 2 as the magnetic yoke 21 and the central magnetic part 22, two common magnetic parts 24 and two side magnetic parts 23 provided on the magnetic yoke 21, and setting the central magnetic part 22 as the first magnetic part 221 located in the first area 325 and the second magnetic part 222 located in the second area 326, and the two common magnetic parts 24 are respectively corresponding to the two first recessed parts 322, so that the two common magnetic parts 24 are respectively spaced from the first magnetic part 221 and the second magnetic part 222 to form a first magnetic gap 243, and the two side magnetic parts 23 are respectively corresponding to the two second recessed parts 324, so that the two side magnetic parts 23 are respectively spaced from the first magnetic part 221 and the second magnetic part 222 to form a second magnetic gap 235, so that the first magnetic gap 243 and the second magnetic gap 235 cooperate to form a magnetic gap 25. It can be understood that the two first recessed parts 322 of the voice coil 32 are respectively suspended from the two first magnetic gaps 243, and the two second recessed parts 324 are respectively suspended from the two second magnetic gaps 235.

[0087] It can be understood that by setting the voice coil 32 as a special-shaped voice coil, the magnetic circuit system 2 is set according to the structure of the voice coil 32, which not only increases the total length of the voice coil 32 and improves the L value of the voice coil 32, but also increases the magnet area of ​​the magnetic circuit system 2, thereby improving the overall performance and sound loudness of the machine.

[0088] In this embodiment, two first recessed portions 322 and two second recessed portions 324 enclose a first region 325 in the center of the voice coil 32, and adjacent first recessed portions 322 and second recessed portions 324 respectively enclose a first side edge 321 and a second side edge 323 of the voice coil 32 to form a second region 326. Optionally, the central magnetic portion 22 includes a plurality of second magnetic portions 222, and each second magnetic portion 222 is disposed in a second region 326.

[0089] Optionally, the second region 326 includes four, and the four second regions 326 are located outside the first region 325. In this embodiment, the first recessed portion 322, the second region 326, and the second recessed portion 324 are arranged around the periphery of the first region 325. The central magnetic portion 22 includes four second magnetic portions 222, and the four second magnetic portions 222 are arranged in a one-to-one correspondence with the four second regions 326.

[0090] In this embodiment, if Figure 3 , Figure 4As shown, each side magnetic portion 23 includes a side magnet 231 and a side magnetic conductive plate 232 which are stacked, and the side magnet 231 is connected to the magnetic yoke 21. Optionally, the side magnetic conductive plate 232 and the housing 1 are an integrally formed structure. The first magnetic portion 221 of the central magnetic portion 22 includes a first central magnet 2211 and a first central magnetic conductive plate 2212 which are stacked, and the first central magnet 2211 is connected to the magnetic yoke 21. Each second magnetic portion 222 of the central magnetic portion 22 includes a second central magnet 2221 and a second central magnetic conductive plate 2222 which are stacked, and the second central magnet 2221 is connected to the magnetic yoke 21. Each common magnetic portion 24 includes a common magnet 241 and a common magnetic conductive plate 242 which are stacked, and the common magnet 241 is connected to the magnetic yoke 21.

[0091] It can be understood that the side magnets 231 and the side magnetic conductive plates 232 of the side magnetic part 23 are stacked along the vibration direction of the vibration system 3, the first center magnet 2211 and the first center magnetic conductive plate 2212 of the first magnetic part 221 of the center magnetic part 22, the second center magnet 2221 and the second center magnetic conductive plate 2222 of the second magnetic part 222 are stacked along the vibration direction of the vibration system 3, and the common magnet 241 and the common magnetic conductive plate 242 of the common magnetic part 24 are stacked along the vibration direction of the vibration system 3.

[0092] In one embodiment, the housing 1 has two first extension edges 11 extending along the first direction and two second extension edges 12 extending along the second direction, each first side edge 321 corresponds to a second extension edge 12, and each second side edge 323 corresponds to a first extension edge 11; the two common magnetic portions 24 both extend along the first direction and are located on opposite sides of the first magnetic portion 221 along the first direction; the two side magnetic portions 23 are respectively arranged corresponding to the two first extension edges 11, and each side magnetic portion 23 includes a main body portion 233 extending along the first direction and a protrusion 234 protruding from the main body portion 233 toward the second recessed portion 324; wherein the first direction and the second direction are arranged at an angle.

[0093] In this embodiment, if Figure 4 As shown, the first extension edge 11 of the shell 1 extends along the first direction, and the second extension edge 12 extends along the second direction. The first extension edge 11 and the second extension edge 12 of the shell 1 are vertically arranged. At this time, the two common magnetic parts 24 of the magnetic circuit system 2 both extend along the first direction, and the two common magnetic parts 24 are located on opposite sides of the first magnetic part 221 along the first direction.

[0094] Optionally, the two common magnetic parts 24 are symmetrically arranged with the first magnetic part 221 as the symmetry axis. It can be understood that such an arrangement enables the two first recessed parts 322 of the voice coil 32 to be arranged opposite to the first magnetic part 221, that is, the two first side edges 321 of the voice coil 32 are symmetrically arranged, thereby ensuring the balance of the vibration of the voice coil 32 in the magnetic gap 25. In this embodiment, along the second direction, each common magnetic part 24 is located between the two second magnetic parts 222. In this way, when the magnetic circuit system 2 drives the voice coil 32 to vibrate, the polarization or vibration imbalance of the voice coil 32 can be improved.

[0095] It can be understood that the two side magnetic parts 23 are respectively arranged corresponding to the two first extension edges 11. By setting each side magnetic part 23 as a main body part 233 extending along the first direction and a protrusion part 234 protruding from the main body part 233 toward the second recessed part 324, the protrusion part 234 of each side magnetic part 23 is arranged corresponding to the second recessed part 324, so that the main body part 233 and the protrusion part 234 of the side magnetic part 23 are respectively spaced and opposite to the second magnetic part 222 and the first magnetic part 221, so as to form a second magnetic gap 235.

[0096] Optionally, along the second direction, the two protrusions 234 are located on opposite sides of the first magnetic portion 221 and are arranged directly opposite to the first magnetic portion 221. It can be understood that such an arrangement enables the two second recessed portions 324 of the voice coil 32 to be arranged directly opposite to the first magnetic portion 221, that is, the two second side edges 323 of the voice coil 32 are symmetrically arranged, thereby ensuring the balanced vibration of the voice coil 32 in the magnetic gap 25.

[0097] In this embodiment, the two side magnetic parts 23 are symmetrically arranged with the first magnetic part 221 as the symmetry axis. Along the first direction, each protrusion 234 is located between the two second magnetic parts 222, and the two second magnetic parts 222 are symmetrically arranged with the protrusion 234 as the symmetry axis. In this way, when the magnetic circuit system 2 drives the voice coil 32 to vibrate, the polarization or vibration imbalance of the voice coil 32 can be improved.

[0098] In one embodiment, each first recessed portion 322 includes a first section 3221, a second section 3222 and a third section 3223 connected in sequence, the first section 3221 and the third section 3223 are connected to the first side 321 at one end away from the second section 3222, and the two second sections 3222 are located on opposite sides of the first magnetic portion 221 along the first direction; each second recessed portion 324 includes a first edge 3241, a second edge 3242 and a third edge 3243 connected in sequence, the first edge 3241 and the third edge 3243 are connected to the second side 323 at one end away from the second edge 3242, and the two second edges 3242 are located on opposite sides of the first magnetic portion 221 along the second direction; wherein, the two second sections 3222 and the two second edges 3242 enclose a first area 325.

[0099] In this embodiment, if Figure 4 , Figure 5 and Figure 7 As shown, the first side 321 and the second side 323 of the voice coil 32 are connected end to end to form a ring structure, the first side 321 of the voice coil 32 extends along the second direction, and the second side 323 extends along the first direction. Optionally, the connection between the first side 321 and the second side 323 of the voice coil 32 is a smooth transition connection.

[0100] It can be understood that the two first side edges 321 of the voice coil 32 are concavely close to each other along the first direction to form two opposite first concave portions 322, and each common magnetic portion 24 is located in a concave region formed by a first concave portion 322. The two second side edges 323 of the voice coil 32 are concavely close to each other along the second direction to form two opposite second concave portions 324, and the protrusion 234 of each side magnetic portion 23 is located in a concave region formed by a second concave portion 324.

[0101] Optionally, the two first recessed portions 322 of the voice coil 32 are symmetrically arranged with the first magnetic portion 221 as the symmetry axis, and the two second recessed portions 324 are symmetrically arranged with the first magnetic portion 221 as the symmetry axis. In this embodiment, each first recessed portion 322 of the voice coil 32 is located in the middle of a first side 321, and each second recessed portion 324 is located in the middle of a second side 323.

[0102] It can be understood that each first recessed portion 322 includes a first section 3221, a second section 3222, and a third section 3223 connected in sequence. Optionally, the two second sections 3222 of the two first recessed portions 322 are located at opposite sides of the first magnetic portion 221 along the first direction. Each second recessed portion 324 includes a first edge 3241, a second edge 3242, and a third edge 3243 connected in sequence. Optionally, the two second edges 3242 of the two second recessed portions 324 are located at opposite sides of the first magnetic portion 221 along the second direction. In this embodiment, the two second sections 3222 of the two first recessed portions 322 and the two second edges 3242 of the two second recessed portions 324 enclose a first region 325.

[0103] In this embodiment, along the second direction, the first section 3221 and the third section 3223 of the first recessed portion 322 are opposite and spaced apart, so that the first section 3221, the second section 3222 and the third section 3223 enclose a first recessed area 3224, and each common magnetic portion 24 is located in a first recessed area 3224. Along the first direction, the first side 3241 and the third side 3243 of the second recessed portion 324 are opposite and spaced apart, so that the first side 3241, the second side 3242 and the third side 3243 enclose a second recessed area 3244, and the protrusion 234 of each side magnetic portion 23 is located in a second recessed area 3244.

[0104] It can be understood that the first section 3221 / third section 3223 of the first recessed portion 322, the first side 321, the second side 323, and the first side 3241 / third side 3243 of the second recessed portion 324 enclose the second area 326. In this embodiment, the connection between the first recessed portion 322 and the first side 321 is smoothly transitioned, and optionally, the connection between the first section 3221 of the first recessed portion 322 and the first side 321 is smoothly transitioned, and the connection between the third section 3223 and the first side 321 is smoothly transitioned. The connection between the second recessed portion 324 and the second side 323 is smoothly transitioned. Optionally, the connection between the first side 3241 of the second recessed portion 324 and the second side 323 is smoothly transitioned, and the connection between the third side 3243 and the second side 323 is smoothly transitioned.

[0105] Optionally, the first section 3221 of the first recessed portion 322 is connected to the second section 3222 in a smooth transition connection, and the third section 3223 is connected to the second section 3222 in a smooth transition connection. Optionally, the first side 3241 of the second recessed portion 324 is connected to the second side 3242 in a smooth transition connection, and the third side 3243 is connected to the second side 3242 in a smooth transition connection.

[0106] In one embodiment, if Figure 5 and Figure 7 As shown, the adjacent first recessed portions 322 and second recessed portions 324 are spaced apart to form a communication port 327 connecting the first region 325 and the second region 326. In this embodiment, the first region 325 of the voice coil 32 is connected to the second region 326 through the communication port 327.

[0107] Of course, in other embodiments, the adjacent first recessed portions 322 and second recessed portions 324 are in contact with each other, that is, the first area 325 and the second area 326 of the voice coil 32 are not connected, which is not limited here.

[0108] It can be understood that the first magnetic portion 221 and the second magnetic portion 222 of the central magnetic portion 22 can be separately provided; or, the first magnetic portion 221 and the second magnetic portion 222 of the central magnetic portion 22 can be an integrally formed structure.

[0109] It should be noted that when the first region 325 of the voice coil 32 is not connected to the second region 326, the first magnetic portion 221 and the second magnetic portion 222 of the central magnetic portion 22 may be separately provided. When the first region 325 of the voice coil 32 is connected to the second region 326, the first magnetic portion 221 and the second magnetic portion 222 of the central magnetic portion 22 may be separately provided or may be integrally provided.

[0110] In one embodiment, adjacent first recessed portions 322 and second recessed portions 324 are spaced apart to form a connecting port 327 connecting the first region 325 and the second region 326 , and the central magnetic portion 22 also includes a connecting portion connecting the first magnetic portion 221 and the second magnetic portion 222 , and the connecting portion is located within the connecting port 327 .

[0111] In one embodiment, the vibration system 3 also includes a centering support plate 33, which includes an external connection portion 331, an internal connection portion 332, and an elastic arm portion 333 connecting the external connection portion 331 and the internal connection portion 332. The external connection portion 331 is connected to the outer shell 1, and the internal connection portion 332 is connected to the voice coil 32. The internal connection portion 332 is provided with an internal solder pad electrically connected to the lead of the voice coil 32.

[0112] In this embodiment, if Figure 2 , Figure 4 and Figure 5 As shown, by providing the centering support 33, the outer connection portion 331 of the centering support 33 is connected to the housing 1, and the inner connection portion 332 is connected to the voice coil 32. In this way, the centering support 33 can be used to center the vibration of the voice coil 32, thereby preventing the voice coil 32 from swinging or polarizing during the vibration process. At the same time, the voice coil 32 is connected and conducted with the external circuit through the centering support 33.

[0113] It can be understood that the two ends of the centering support 33 are electrically connected to the lead wire of the voice coil 32 and the external circuit respectively. In this embodiment, the centering support 33 can be arranged at the bottom of the voice coil 32. Of course, the centering support 33 can also be arranged at the top of the voice coil 32, that is, the centering support 33 is located between the voice coil 32 and the diaphragm 311, which is not limited here. Optionally, the centering support 33 can be one or more.

[0114] In one embodiment, the shell 1 has two first extension edges 11 and two second extension edges 12 connected end to end, the first extension edges 11 extend along the first direction, the second extension edges 12 extend along the second direction, and the centering support pieces 33 include two, and the two centering support pieces 33 correspond to the two second extension edges 12 respectively; wherein the first direction is set at an angle to the second direction.

[0115] In this embodiment, if Figures 4 to 7 As shown, the two common magnetic parts 24 and the two side magnetic parts 23 of the magnetic circuit system 2 are extended along the first direction, so that an escape space is formed between the two second extension edges 12 of the housing 1 and the magnetic circuit system 2. By arranging two centering supports 33 corresponding to the two second extension edges 12 respectively, it is possible to provide installation space for the centering supports 33 and realize electrical connection between the voice coil 32 and the external circuit through the centering supports 33.

[0116] Of course, in other embodiments, there may be four centering supports 33 , and the four centering supports 33 are respectively disposed corresponding to the four corners 13 of the housing 1 .

[0117] Optionally, the outer connecting portion 331, the elastic arm portion 333 and the inner connecting portion 332 of the centering support 33 can be an integrally formed structure. This can effectively ensure the structural strength of the centering support 33 and simplify the processing steps of the centering support 33. In order to ensure the deformation ability of the centering support 33, the elastic arm portion 333 optionally includes at least one bend. Optionally, the outer connecting portion 331, the elastic arm portion 333 and the inner connecting portion 332 of the centering support 33 are located in the same plane.

[0118] In order to facilitate the electrical connection between the centering support 33 and the voice coil 32, in this embodiment, the inner connection portion 332 of the centering support 33 is provided with an inner pad, and the inner pad is electrically connected to the lead of the voice coil 32. In order to facilitate the connection and conduction between the centering support 33 and the external circuit, in this embodiment, the external connection portion 331 is provided with an outer pad 334 for connecting to the external circuit, that is, the outer pad 334 is electrically connected to the external circuit, which is not limited here.

[0119] In one embodiment, the magnetic yoke 21 is provided with a avoidance area corresponding to the inner connection portion 332. It can be understood that by providing the avoidance area on the magnetic yoke 21, the avoidance area can be used to provide avoidance for the centering support 33 during the vibration process of the voice coil 32, ensuring that the inner connection portion 332 of the centering support 33 does not touch the magnetic yoke 21.

[0120] Optionally, the avoidance area is a recessed groove or a through hole. It can be understood that the avoidance area is a recessed groove, that is, a groove structure formed by the side of the magnetic yoke 21 facing the centering support plate 33 being recessed in a direction away from the centering support plate 33. Alternatively, the avoidance area is a through hole, that is, the through hole passes through the magnetic yoke 21; at the same time, the avoidance area can also be used as an air vent of the sound-generating device 100 to ensure that the airflow in the vibration cavity of the sound-generating device 100 is connected with the external airflow during the vibration of the diaphragm 311, thereby ensuring the balance of internal and external air pressures.

[0121] The sound-generating device 100 of the present invention effectively increases the total length of the voice coil 32 and improves the L value of the voice coil 32 by designing the voice coil 32 as a special-shaped structure. At the same time, the magnetic circuit system 2 is set to extend along the first direction and arranged side by side along the second direction. The two common magnetic parts 24, the two side magnetic parts 23 and the first magnetic part 221 and the second magnetic part 222 of the center magnetic part 22 of the magnetic circuit system 2 are designed to correspond to the voice coil 32 structure. In this way, the magnet area of ​​the magnetic circuit system 2 is effectively increased to improve the BL value, thereby greatly improving the performance of the whole machine and the sound effect loudness. The sound-generating device 100 of the present invention controls the shape of the special-shaped voice coil 32 and the design of the magnetic circuit shape, so that the actual simulation BL value increases from 0.97 to 1.27, and the BL value is significantly improved. The effect is obvious and the implementation is simple. It can be promoted and used on mobile phones, tablets, laptops, and XR, and has strong applicability.

[0122] The present invention also provides an electronic device, which includes the above-mentioned sound-generating device 100. The specific structure of the sound-generating device 100 refers to the above-mentioned embodiment. Since the electronic device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0123] In one embodiment, the electronic device further includes a device housing and a flexible circuit board. The sound-generating device 100 is disposed in the device housing. One end of the flexible circuit board is electrically connected to the sound-generating device 100, and the other end of the flexible circuit board is used to connect to an external power source.

[0124] It can be understood that the flexible circuit board is used to connect the external circuit to the sound device 100. The flexible circuit board is provided with inner pads and outer pads, the inner pads of the flexible circuit board are connected to the sound device 100, and the outer pads of the flexible circuit board are used to connect to external terminals.

[0125] In this embodiment, the device housing has a cavity, the sound device 100 is disposed in the cavity of the device housing, and at least one end of the flexible circuit board connected to the sound device 100 is located in the cavity of the device housing. Of course, in other embodiments, the flexible circuit board can also be entirely disposed in the cavity of the device housing, which is not limited here.

[0126] It is understandable that the electronic device may be a headset, a mobile phone, a computer, a tablet computer, a smart wearable device, etc., which is not limited here. In the electronic device, the sound device 100 may be assembled into the housing of the electronic device in the form of a module, or may be assembled into the housing of the electronic device in the form of a monomer. The electronic device may be a mobile phone, an MP3, an MP4, a tablet computer, a laptop computer, a headset, a wearable device, etc., which are not listed here one by one.

[0127] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: The sound-generating device comprises: shell; A magnetic circuit system, the magnetic circuit system is connected to the housing, and the magnetic circuit system is provided with a magnetic gap; and A vibration system, the vibration system comprising a diaphragm assembly and a voice coil, wherein the periphery of the diaphragm assembly is connected to the housing and is opposite to the magnetic circuit system, one end of the voice coil is connected to the diaphragm assembly, and the other end of the voice coil is suspended in the magnetic gap; Wherein, the voice coil includes two first sides and two second sides connected end to end, the two first sides are arranged opposite to each other, and the two first sides are recessed toward the inner side of the voice coil to form a first recessed portion, the two second sides are arranged opposite to each other, and the two second sides are recessed toward the inner side of the voice coil to form a second recessed portion, the two first recessed portions and the two second recessed portions are enclosed to form a first area, and a second area is formed between adjacent first recessed portions and second recessed portions, and the magnetic circuit system is provided with a first magnetic portion located in the first area and a second magnetic portion located in the second area.

2. The sound-generating device according to claim 1, characterized in that: The magnetic circuit system includes a magnetic yoke and a central magnetic part, two common magnetic parts and two side magnetic parts arranged on the magnetic yoke, the central magnetic part includes the first magnetic part and the second magnetic part, the two common magnetic parts correspond to the two first recessed parts respectively, and are spaced from the first magnetic part and the second magnetic part to form a first magnetic gap, the two side magnetic parts correspond to the two second recessed parts respectively, and are spaced from the first magnetic part and the second magnetic part to form a second magnetic gap, and the first magnetic gap and the second magnetic gap cooperate to form the magnetic gap.

3. The sound-generating device according to claim 2, characterized in that: The housing has two first extending sides extending along a first direction and two second extending sides extending along a second direction, each of the first sides corresponds to one of the second extending sides, and each of the second sides corresponds to one of the first extending sides; The two common magnetic portions both extend along the first direction and are located at opposite sides of the first magnetic portion along the first direction; The two edge magnets are respectively arranged corresponding to the two first extension edges, and each edge magnet comprises a main body extending along the first direction and a protruding portion protruding from the main body toward the second recessed portion; Wherein, the first direction and the second direction are arranged at an angle.

4. The sound-generating device according to claim 3, characterized in that: Along the second direction, the two protrusions are located on opposite sides of the first magnetic portion and are arranged directly opposite to the first magnetic portion; And / or, the two edge magnetic parts are symmetrically arranged with the first magnetic part as the symmetry axis; And / or, the two common magnetic parts are symmetrically arranged with the first magnetic part as the symmetry axis; And / or, along the second direction, each of the common magnetic portions is located between two of the second magnetic portions; And / or, along the first direction, each of the protruding portions is located between two of the second magnetic portions, and the two second magnetic portions are symmetrically arranged with the protruding portion as a symmetry axis.

5. The sound generating device according to claim 3, characterized in that: Each of the first recessed portions includes a first section, a second section, and a third section connected in sequence, one end of the first section and the third section away from the second section is connected to the first side, and two second sections are located on opposite sides of the first magnetic portion along the first direction; Each of the second recessed portions comprises a first side, a second side and a third side connected in sequence, one end of the first side and the third side away from the second side is connected to the second side, and the two second sides are located at opposite sides of the first magnetic portion along the second direction; The two second sections and the two second sides enclose the first area.

6. The sound generating device according to claim 5, characterized in that: Along the second direction, the first section and the third section are opposite and spaced apart, so that the first section, the second section and the third section enclose a first recessed area, and each of the common magnetic portions is located in one of the first recessed areas; And / or, the connection between the first section and the first side is a smooth transition connection; And / or, the connection between the third section and the first side is in a smooth transition connection; And / or, the connection between the first section and the second section is a smooth transition connection; And / or, the connection between the third section and the second section is a smooth transition connection; And / or, the connection between the first side and the second side is a smooth transition connection; And / or, along the first direction, the first side and the third side are opposite and spaced apart, so that the first side, the second side and the third side enclose a second recessed area, and each of the protruding portions is located in one of the second recessed areas; And / or, the connection between the first side and the second side is a smooth transition connection; And / or, the connection between the third side and the second side is a smooth transition connection; And / or, the connection between the first side and the second side is a smooth transition connection; And / or, the connection between the third side and the second side is a smooth transition connection.

7. The sound generating device according to claim 2, characterized in that: The two first recessed portions are symmetrically arranged with the first magnetic portion as a symmetry axis; And / or, the two second recessed portions are symmetrically arranged with the first magnetic portion as a symmetry axis; And / or, each of the first recessed portions is located in the middle of one of the first side edges; And / or, each of the second recessed portions is located in the middle of a second side edge.

8. The sound generating device according to claim 2, characterized in that: The adjacent first recessed portions and the second recessed portions are spaced apart to form a communication port connecting the first area and the second area; Or, the adjacent first recessed portions and the second recessed portions are in abutment with each other; Alternatively, the adjacent first recessed portions and the second recessed portions are spaced apart to form a connecting opening connecting the first region and the second region, and the central magnetic portion further includes a connecting portion connecting the first magnetic portion and the second magnetic portion, and the connecting portion is located within the connecting opening.

9. The sound generating device according to claim 2, characterized in that: Each of the edge magnetic parts comprises a stacked edge magnet and an edge magnetic conductive plate, the edge magnet is connected to the magnetic conductive yoke, and the edge magnetic conductive plate and the housing are an integrally formed structure; And / or, each of the common magnetic parts comprises a common magnet and a common magnetic conductive plate which are stacked, and the common magnet is connected to the magnetic conductive yoke; And / or, the first magnetic part includes a first central magnet and a first central magnetic conductive plate which are stacked, and the first central magnet is connected to the magnetic conductive yoke; And / or, each of the second magnetic parts includes a second central magnet and a second central magnetic conductive plate which are stacked, and the second central magnet is connected to the magnetic conductive yoke.

10. An electronic device, characterized in that: The electronic device comprises the sound emitting device according to any one of claims 1 to 9.

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