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, the sound production device comprises a shell, a vibration system and a magnetic circuit system, the vibration system comprises a vibrating diaphragm and a voice coil connected to the vibrating diaphragm, the periphery of the vibrating diaphragm is connected to the shell, the magnetic circuit system is connected to the shell and is opposite to the vibrating diaphragm, and the voice coil is connected to the magnetic circuit system. The magnetic circuit system comprises a magnetic conductive yoke, a central magnetic part and an edge magnetic part, the edge magnetic part is arranged at the outer side of the central magnetic part and is spaced from the central magnetic part to form a magnetic gap, one end of the voice coil is suspended in the magnetic gap, the edge magnetic part and the central magnetic part form a limiting groove communicated with the magnetic gap, and the limiting groove is located at one side, back to the vibrating diaphragm, of the edge magnetic part and the central magnetic part; at least part of the magnetic conductive yoke is arranged in the limiting groove. The sound production device effectively increases the volume of the magnet in the magnetic circuit system, improves the magnetic field intensity, increases the BL value of the product, and improves the acoustic performance.

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 increases the magnetic field strength of a magnetic circuit system, and the sound-generating device effectively increases the magnetic field strength, increases the BL value, and thus improves the acoustic performance.

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

[0007] shell;

[0008] a vibration system, the vibration system comprising a diaphragm and a voice coil connected to the diaphragm, the periphery of the diaphragm being connected to the housing; and

[0009] A magnetic circuit system, wherein the magnetic circuit system is connected to the housing and is opposite to the diaphragm, the magnetic circuit system comprises a magnetic yoke, a central magnetic portion and a side magnetic portion, the side magnetic portion is arranged on the outside of the central magnetic portion and is spaced from the central magnetic portion to form a magnetic gap, one end of the voice coil is suspended in the magnetic gap, the side magnetic portion and the central magnetic portion form a limiting groove connected to the magnetic gap, the limiting groove is located on the side of the side magnetic portion and the central magnetic portion facing away from the diaphragm, and is arranged opposite to the magnetic gap, and at least a portion of the magnetic yoke is arranged in the limiting groove.

[0010] In one embodiment, the central magnetic part includes a central magnet and a central magnetic conductive plate which are stacked, and a first groove which is connected to the magnetic gap is provided on a side of the central magnet which is away from the central magnetic conductive plate;

[0011] The edge magnet part comprises a stacked edge magnet and an edge magnetic conductive plate, and a second groove connected to the magnetic gap is provided on a side of the edge magnet facing away from the edge magnetic conductive plate;

[0012] Wherein, the first groove and the second groove cooperate to form the limiting groove.

[0013] In one embodiment, the first groove is disposed around the periphery of the central magnet to form a first protrusion on a side of the central magnet facing away from the central magnetic conductive plate;

[0014] The second groove is arranged around the magnetic gap to form a second convex portion on the side of the side magnet facing away from the side magnetic conductive plate, and the second convex portion is located on the side of the second groove away from the magnetic gap.

[0015] In one embodiment, the magnetic yoke includes a main body and a side portion arranged at an angle, the side portion extends toward the direction of the diaphragm, the main body is provided with a through hole, the main body is limited in the limiting groove, and the first convex portion is penetrated through the through hole, and the second convex portion is surrounded and arranged on the outside of the main body;

[0016] The side magnetic part is provided with an escape space, and the side part passes through the escape space and is connected with the shell.

[0017] In one embodiment, the surface of the first protrusion facing away from the central magnetic conductive plate is flush with the side of the magnetic conductive yoke facing away from the limiting groove;

[0018] And / or, the surface of the second protrusion facing away from the edge magnetic conductive plate is flush with the side of the magnetic conductive yoke facing away from the limiting groove;

[0019] And / or, the central magnet is rectangular, the central magnet has a long side and a short side, the length of the long side is defined as L1, the length of the short side is defined as L2, the length of the first protrusion extending along the long side is defined as the length d1 of the first protrusion, and the length of the first protrusion extending along the short side is defined as the width d2 of the first protrusion; wherein, 0.1mm≤d1≤(L1-0.1mm), 0.1mm≤d2≤(L2-0.1mm).

[0020] In one embodiment, the depth of the first groove along the vibration direction of the vibration system is defined as the depth of the first groove, and the depth of the first groove is greater than or equal to the thickness of the magnetic yoke along the vibration direction of the vibration system;

[0021] And / or, the depth of the second groove along the vibration direction of the vibration system is defined as the depth of the second groove, and the depth of the second groove is greater than or equal to the thickness of the magnetic yoke along the vibration direction of the vibration system.

[0022] In one embodiment, a fixing groove connected to the magnetic gap is provided on a side of the edge magnet facing the edge magnetic conductive plate, the edge magnetic conductive plate is arranged in the fixing groove, and the edge magnet is connected to the housing;

[0023] The fixing groove is arranged around the magnetic gap to form a third convex portion on the side of the edge magnet facing the diaphragm, and the third convex portion is located on the side of the fixing groove away from the magnetic gap.

[0024] In one embodiment, the housing includes a vertical wall and a straight portion formed by extending inward from one end of the vertical wall, and the periphery of the diaphragm is connected to one end of the vertical wall away from the straight portion;

[0025] The side magnet is provided with a third groove corresponding to the straight portion, and the straight portion is confined in the third groove;

[0026] Wherein, the third protrusion is located between the third groove and the fixing groove.

[0027] In one embodiment, the central magnet is rectangular, the central magnet has two long sides and two short sides, the side magnets include two first side magnets and two second side magnets, the two first side magnets correspond to the two long sides respectively, the two second side magnets correspond to the two short sides respectively, and the third protrusion includes a first sub-protrusion provided on the first side magnet and a second sub-protrusion provided on the second side magnet;

[0028] The length of the first side magnet extending along the long side direction is defined as A1, the length of the first side magnet extending along the short side direction is defined as A2, the length of the first sub-protrusion extending along the long side direction is defined as a1, the length of the first sub-protrusion extending along the short side direction is defined as a2, 0.1mm≤a1≤A1, 0.1mm≤a2≤(A2-0.1mm);

[0029] Define the length of the second side magnet extending along the short side direction as B1, define the length of the second side magnet extending along the long side direction as B2, define the length of the second sub-protrusion extending along the short side direction as b1, and define the length of the second sub-protrusion extending along the long side direction as b2, 0.1mm≤b1≤B1, 0.1mm≤b2≤(B2-0.1mm).

[0030] The present invention further provides an electronic device, which includes the sound-generating device described above.

[0031] 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 configuring the vibration system as a diaphragm and a voice coil connected to the diaphragm, so that the periphery of the diaphragm is connected to the housing, and configuring the magnetic circuit system as a magnetic yoke, a central magnetic portion and a side magnetic portion, so that the side magnetic portion is arranged on the outside of the central magnetic portion and is spaced from the central magnetic portion to form a magnetic gap, and one 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 to vibrate, thereby achieving At the same time, by using the edge magnetic part and the center magnetic part to form a limiting groove connected to the magnetic gap, the limiting groove is located on the side of the edge magnetic part and the center magnetic part that is away from the diaphragm and is arranged directly opposite to the magnetic gap, and at least a part of the magnetic yoke is arranged in the limiting groove, the magnetic yoke can be used to fix the edge magnetic part and the center magnetic part, and the sound-generating device can increase the volume of the edge magnetic part and the center magnetic part by changing the structure of the magnetic yoke, thereby increasing the magnetic field strength of the magnetic circuit system, so that the sound-generating device makes full use of the existing structure, effectively increases the BL value, and thus improves the acoustic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] 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;

[0034] Figure 2 A bottom-up structural schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0035] Figure 3 A cross-sectional schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0036] Figure 4 An exploded schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0037] Figure 5 A partial structural schematic diagram of an embodiment of a magnetic circuit system provided by the present invention;

[0038] Figure 6 A partial top view structural schematic diagram of an embodiment of a magnetic circuit system provided by the present invention;

[0039] Figure 7 A partial bottom view structural diagram of an embodiment of a magnetic circuit system provided by the present invention;

[0040] Figure 8 A schematic structural diagram of an embodiment of a central magnet provided by the present invention;

[0041] Fig. 9 A schematic structural diagram of an embodiment of an edge magnet provided by the present invention;

[0042] Fig.10 This is a comparison chart of the FR curves of the sound-generating device provided by the present invention and the prior art.

[0043] Description of Figure Numbers:

[0044] 100. Sounding device; 1. Shell; 11. Vertical wall; 12. Straight portion; 2. Magnetic circuit system; 21. Magnetic yoke; 211. Main body; 2111. Through hole; 2112. Avoidance area; 2113. First connecting portion; 2114. Second connecting portion; 2115. Extension portion; 212. Side portion; 22. Central magnetic portion; 221. Central magnet; 2211. First groove; 2212. First convex portion; 222. Central magnetic plate; 23. Side magnetic portion; 231. Side magnet; 2311. First side magnet; 2312. Second side magnet; 2 313, second groove; 2314, second convex part; 2315, fixing groove; 2316, third convex part; 2317, first sub-convex part; 2318, second sub-convex part; 2319, third groove; 232, edge magnetic guide plate; 233, avoidance space; 24, magnetic gap; 25, limiting groove; 3, vibration system; 31, diaphragm; 311, dome; 312, folding ring part; 313, fixing part; 314, flange; 32, voice coil; 33, centering support plate; 331, external connection part; 332, internal connection part; 333, elastic part; 334, internal welding pad.

[0045] 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

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 electronic product applications.

[0053] Based on the above concepts and problems, the present invention proposes a sound-emitting device 100. It is understandable that the sound-emitting device 100 is applied to electronic devices, and the electronic devices may be mobile phones, headphones, smart wearable devices, etc., which are not limited here. In this embodiment, the sound-emitting device 100 of the present invention makes full use of the existing structure and designs special-shaped magnets to improve the BL value, so that the performance and sound quality are better. It is understandable that through the design of special-shaped magnets, the BL value can be further increased by at least 0.04WB / m on the basis of the existing structure, and the full frequency band can be improved by about 0.4dB, so that the performance and sound quality are better.

[0054] Please refer to Figures 1 to 9 As shown, in an embodiment of the present invention, the sound-generating device 100 includes a housing 1, a vibration system 3 and a magnetic circuit system 2, wherein the vibration system 3 includes a diaphragm 31 and a voice coil 32 connected to the diaphragm 31, the periphery of the diaphragm 31 is connected to the housing 1, the magnetic circuit system 2 is connected to the housing 1 and is opposite to the diaphragm 31, the magnetic circuit system 2 includes a magnetic yoke 21, a central magnetic portion 22 and a side magnetic portion 23, the side magnetic portion 23 is arranged on the outside of the central magnetic portion 22, and is spaced from the central magnetic portion 22 to form a magnetic gap 24, one end of the voice coil 32 is suspended in the magnetic gap 24, the side magnetic portion 23 and the central magnetic portion 22 form a limiting groove 25 connected to the magnetic gap 24, the limiting groove 25 is located on the side of the side magnetic portion 23 and the central magnetic portion 22 facing away from the diaphragm 31, and is arranged opposite to the magnetic gap 24, and at least part of the magnetic yoke 21 is arranged in the limiting groove 25.

[0055] 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.

[0056] Optionally, the magnetic circuit system 2 is arranged in a square shape. For example, the magnetic circuit system 2 may include a central magnetic portion 22 and a side magnetic portion 23, both of which are square structures. In the present embodiment, the vibration system 3 is optionally arranged in a square shape. The diaphragm 31 of the vibration system 3 is optionally arranged in a square shape. It can be understood that the periphery of the diaphragm 31 of the vibration system 3 can be connected to the magnetic circuit system 2, or the magnetic circuit system 2 and the vibration system 3 can be respectively assembled on the module housing, etc., which is not limited here.

[0057] 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 4 As shown, the sound-generating device 100 also includes a shell 1, a magnetic circuit system 2 connected to one end of the shell 1, and a vibration system 3 connected to the other end of the shell 1 and arranged opposite to the magnetic circuit system 2, that is, the periphery of the diaphragm 31 of the vibration system 3 is connected to the other end of the shell 1 and arranged opposite to the magnetic circuit system 2.

[0058] In this embodiment, if Figure 1 , Figure 3 and Figure 4 As shown, the diaphragm 31 includes a dome 311, a folding ring portion 312 arranged around the dome 311, and a fixing portion 313 connected to the outer side of the folding ring portion 312. The fixing portion 313 of the diaphragm 31 is connected to the housing 1, and the dome 311 of the diaphragm 31 is connected to the voice coil 32. In order to further improve the connection stability and waterproof sealing performance between the diaphragm 31 and the housing 1, the outer peripheral edge of the diaphragm 31 is bent and extended toward the housing 1 to form a flange 314, and the flange 314 is connected to the outer wall of the housing 1.

[0059] It is understandable that the dome 311 and the folding ring 312 of the diaphragm 31 may be an integrally formed structure or may be separately arranged, which is not limited here. Figure 3 and Figure 4 As shown, the dome 311 and the folding ring portion 312 are connected and fixed by bonding, and an inner ring portion with a hollow hole is formed on the inner side of the folding ring portion 312. The periphery of the dome 311 is connected to the inner ring portion and covers the hollow hole.

[0060] In this embodiment, if Figure 3 and Figure 4 As shown, the dome 311 of the diaphragm 31 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 24. In this way, the voice coil 32 can be placed at a suitable position in the magnetic gap 24 through the protrusion of the dome 311, ensuring that the magnetic flux lines in the magnetic gap 24 pass through the voice coil 32.

[0061] 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 a plurality of 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 31 of the vibration system 3 enclose a vibration cavity.

[0062] 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.

[0063] 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.

[0064] It can be understood that by setting the magnetic circuit system 2 to be a magnetic yoke 21, a central magnetic part 22 and a side magnetic part 23, the magnetic circuit system 2 can be connected to the housing 1 through the side magnetic part 23, which is not limited here. In this embodiment, the side magnetic part 23 is set outside the central magnetic part 22, and is enclosed with the central magnetic part 22 to form a magnetic gap 24, so that the diaphragm 31 of the vibration system 3 is connected to the end of the housing 1 away from the side magnetic part 23, and is opposite to and spaced from the magnetic circuit system 2, so that one end of the voice coil 32 is connected to the diaphragm 31, and the other end of the voice coil 32 is suspended in the magnetic gap 24, so that current is passed into the voice coil 32, so that the voice coil 32 converts electrical energy into mechanical energy in the magnetic gap 24 formed by the magnetic circuit system 2, so as to drive the voice coil 32 to drive the diaphragm 31 to vibrate, thereby achieving sound generation.

[0065] 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.

[0066] In this embodiment, the sound-generating device 100 sets a limiting groove 25 on the side of the side magnetic portion 23 and the center magnetic portion 22 facing away from the diaphragm 31, so that the limiting groove 25 is connected to the magnetic gap 24 and is arranged opposite to each other, and at least a part of the magnetic yoke 21 is arranged in the limiting groove 25. In this way, the sound-generating device 100 makes full use of the existing structure and sets the magnetic yoke 21 in the limiting groove 25. The magnetic yoke 21 can be used to fix the side magnetic portion 23 and the center magnetic portion 22, and the sound-generating device 100 can increase the volume of the side magnetic portion 23 and the center magnetic portion 22 by changing the structure of the magnetic yoke 21, thereby increasing the magnetic field strength of the magnetic circuit system 2, effectively increasing the BL value, and improving the acoustic performance.

[0067] Understandable, such as Fig.10 As shown, the sound-generating device 100 can further increase the BL value by at least 0.04WB / m on the basis of the existing structure through the design of special-shaped magnets, and improve the full frequency band by about 0.4dB, thereby improving the performance and sound quality.

[0068] The sound-generating device 100 of the present invention is configured by accommodating the vibration system 3 and the magnetic circuit system 2 in the housing 1, and configuring the vibration system 3 as a diaphragm 31 and a voice coil 32 connected to the diaphragm 31, so that the periphery of the diaphragm 31 is connected to the housing 1, and configuring the magnetic circuit system 2 as a magnetic yoke 21, a central magnetic portion 22 and a side magnetic portion 23, so that the side magnetic portion 23 is arranged on the outside of the central magnetic portion 22 and is spaced from the central magnetic portion 22 to form a magnetic gap 24, and one end of the voice coil 32 is suspended in the magnetic gap 24, so that current is passed through the voice coil 32, so that the voice coil 32 converts electrical energy into mechanical energy in the magnetic gap 24 formed by the magnetic circuit system 2, so as to drive the voice coil 32 to drive the diaphragm 31 to vibrate, thereby To achieve sound generation; at the same time, by utilizing the edge magnetic portion 23 and the center magnetic portion 22 to form a limiting groove 25 connected to the magnetic gap 24, the limiting groove 25 is located on the side of the edge magnetic portion 23 and the center magnetic portion 22 that is away from the diaphragm 31, and is arranged directly opposite to the magnetic gap 24, and at least a portion of the magnetic yoke 21 is arranged in the limiting groove 25, the magnetic yoke 21 can be utilized to fix the edge magnetic portion 23 and the center magnetic portion 22, and the sound generating device 100 can increase the volume of the edge magnetic portion 23 and the center magnetic portion 22 by changing the structure of the magnetic yoke 21, thereby increasing the magnetic field strength of the magnetic circuit system 2, so that the sound generating device 100 makes full use of the existing structure, effectively increases the BL value, and thus improves the acoustic performance.

[0069] In one embodiment, the central magnetic portion 22 includes a stacked central magnet 221 and a central magnetic conductive plate 222, and a first groove 2211 connecting to the magnetic gap 24 is provided on the side of the central magnet 221 facing away from the central magnetic conductive plate 222; the side magnetic portion 23 includes a stacked side magnet 231 and a side magnetic conductive plate 232, and a second groove 2313 connecting to the magnetic gap 24 is provided on the side of the side magnet 231 facing away from the side magnetic conductive plate 232; wherein the first groove 2211 and the second groove 2313 cooperate to form a limiting groove 25.

[0070] In this embodiment, if Figures 3 to 9 As shown, the central magnet 221 and the central magnetic plate 222 of the central magnetic part 22 are stacked along the vibration direction of the vibration system 3, and the side magnets 231 and the side magnetic plates 232 of the side magnetic part 23 are stacked along the vibration direction of the vibration system 3. Optionally, the central magnet 221 is located on the side of the central magnetic plate 222 facing away from the diaphragm 31, and the central magnetic plate 222 is opposite to the diaphragm 31 and is spaced apart; the side magnet 231 is located on the side of the side magnetic plate 232 facing away from the diaphragm 31, and the side magnetic plate 232 is opposite to the diaphragm 31 and is spaced apart.

[0071] It can be understood that the center magnet 221 of the center magnetic part 22 is opposite to the side magnet 231 of the side magnetic part 23 and are located on both sides of the magnetic gap 24, and the center magnetic conductive plate 222 of the center magnetic part 22 is opposite to the side magnetic conductive plate 232 of the side magnetic part 23 and are located on both sides of the magnetic gap 24, so that the side magnet 231 and the side magnetic conductive plate 232 of the side magnetic part 23 are located on the outside of the center magnet 221 and the center magnetic conductive plate 222 of the center magnetic part 22, and are spaced from the center magnet 221 and the center magnetic conductive plate 222 of the center magnetic part 22 to form a magnetic gap 24.

[0072] In this embodiment, a first groove 2211 is provided on the side of the central magnet 221 of the central magnetic part 22 facing away from the diaphragm 31, and a second groove 2313 is provided on the side of the side magnet 231 of the side magnetic part 23 facing away from the diaphragm 31, so that the first groove 2211 and the second groove 2313 are both connected to the magnetic gap 24, and cooperate to form a limiting groove 25, so that the limiting magnetic yoke 21 is installed by using the limiting groove 25. It can be understood that by setting the central magnet 221 and the side magnet 231 as a special-shaped structure to form the limiting groove 25 connected to the magnetic yoke 21, that is, the magnetic yoke 21 is set to a special-shaped structure adapted to the central magnet 221 and the side magnet 231, so that the size and volume of the central magnet 221 and the side magnet 231 are increased on the basis of the existing magnetic circuit system 2 by reducing the size and volume of the magnetic yoke 21, thereby increasing the magnetic field strength of the magnetic circuit system 2, effectively increasing the BL value, and thus improving the acoustic performance.

[0073] In one embodiment, the edge magnet portion 23 may be arranged in an annular shape, in which case the annular edge magnet portion 23 is located outside the central magnet portion 22 and is spaced apart from the central magnet portion 22 to form a magnetic gap 24. Optionally, the edge magnet 231 and / or the edge magnetic conductive plate 232 form a closed integral annular structure.

[0074] Of course, in other embodiments, the edge magnetic part 23 includes a plurality of edge magnetic parts 23, which are arranged around the outside of the central magnetic part 22 and are spaced apart from the central magnetic part 22 to form a magnetic gap 24. Optionally, both the edge magnets 231 and the edge magnetic conductive plates 232 are multiple and arranged one by one, and the adjacent edge magnets 231 are connected end to end to form a closed annular structure. Alternatively, the edge magnets 231 form a closed integral annular structure, the edge magnetic conductive plates 232 are multiple, the adjacent edge magnetic conductive plates 232 are connected end to end to form a closed annular structure, and are arranged corresponding to the annular edge magnets 231; or, the edge magnetic conductive plates 232 form a closed integral annular structure, the edge magnets 231 are multiple, the adjacent edge magnets 231 are connected end to end to form a closed annular structure, and are arranged corresponding to the annular edge magnetic conductive plates 232, which are not limited here.

[0075] It should be noted that, in order to facilitate the installation of the centering support piece 33, multiple side magnets 23 are arranged around the outside of the central magnet part 22, and a gap is provided between two adjacent side magnets 23 for avoiding the centering support piece 33, which is not limited here.

[0076] In this embodiment, there may be multiple side magnetic parts 23, and the multiple side magnetic parts 23 are arranged at intervals and around the outer side of the central magnetic part 22, so that two adjacent side magnetic parts 23 are spaced to form an escape space 233. Optionally, each side magnetic part 23 includes a stacked side magnet 231 and a side magnetic conductive plate 232, and a second groove 2313 connected to the magnetic gap 24 is provided on the side of each side magnet 231 facing away from the diaphragm 31.

[0077] Optionally, the central magnetic portion 22 is rectangular, and the side magnetic portions 23 include four side magnetic portions 23 , which are respectively arranged corresponding to the four side edges of the central magnetic portion 22 .

[0078] In one embodiment, the first groove 2211 is arranged around the periphery of the center magnet 221 to form a first protrusion 2212 on the side of the center magnet 221 facing away from the center magnetic conductive plate 222; the second groove 2313 is arranged around the magnetic gap 24 to form a second protrusion 2314 on the side of the side magnet 231 facing away from the side magnetic conductive plate 232, and the second protrusion 2314 is located on the side of the second groove 2313 away from the magnetic gap 24.

[0079] In this embodiment, if Figure 3 , Figure 5 , Figure 7 and Figure 8 As shown, the first groove 2211 is provided at the periphery of the central magnet 221 on the side facing away from the diaphragm 31. Optionally, the first groove 2211 is provided around the periphery of the central magnet 221, so that the first convex portion 2212 is formed in the center of the side of the central magnet 221 facing away from the central magnetic conductive plate 222, that is, the first groove 2211 is provided around the first convex portion 2212. The second groove 2313 is provided at the inner edge of the side of the side magnet 231 facing away from the diaphragm 31 close to the magnetic gap 24. Optionally, the second groove 2313 is provided around the magnetic gap 24, so that the outer edge of the side magnet 231 facing away from the diaphragm 31 forms the second convex portion 2314, that is, the second convex portion 2314 is located on the side of the second groove 2313 away from the magnetic gap 24.

[0080] It can be understood that the first groove 2211 is formed by the peripheral edge of the side of the center magnet 221 facing away from the center magnetic plate 222 being concave toward the side close to the diaphragm 31; or, the first groove 2211 is formed by the center of the side of the center magnet 221 facing away from the center magnetic plate 222 being convex toward the direction away from the diaphragm 31, so that the convexity is formed by the peripheral edge of the side of the center magnet 221 facing away from the center magnetic plate 222, which is not limited here. The second groove 2313 is formed by the inner peripheral edge of the side of the side magnet 231 facing away from the diaphragm 31 being concave toward the side close to the diaphragm 31; or, the second groove 2313 is formed by the outer edge of the side of the side magnet 231 facing away from the diaphragm 31 being convex toward the direction away from the diaphragm 31, so that the convexity is formed by the inner peripheral edge of the side magnet 231 facing away from the diaphragm 31, which is not limited here.

[0081] It should be noted that a first protrusion 2212 is formed in the center of the side of the center magnet 221 facing away from the diaphragm 31, so as to utilize the first protrusion 2212 to increase the volume and size of the center magnet 221, and a second protrusion 2314 is formed on the outer edge of the side magnet 231 facing away from the diaphragm 31, so as to utilize the second protrusion 2314 to increase the volume and size of the side magnet 231, thereby increasing the magnet volume of the magnetic circuit system 2 in turn, thereby increasing the magnetic field strength, thereby increasing the BL value and improving the acoustic performance; at the same time, the first protrusion 2212 and the peripheral edge of the side of the center magnet 221 facing away from the diaphragm 31 are used to form a first groove 2211, and the second protrusion 2314 and the inner peripheral edge of the side of the side magnet 231 facing away from the diaphragm 31 are used to form a second groove 2313, so that the first groove 2211 and the second groove 2313 cooperate to form a limiting groove 25, so that the limiting groove 25 is used to realize the limiting installation of the magnetic yoke 21.

[0082] Optionally, the surface of the first protrusion 2212 facing away from the center magnetic plate 222 is flush with the side of the magnetic yoke 21 facing away from the limit slot 25. In this way, the side of the magnetic yoke 21 and the center magnetic part 22 facing away from the diaphragm 31 are flush, which is convenient for installation. Optionally, the surface of the second protrusion 2314 facing away from the side magnetic plate 232 is flush with the side of the magnetic yoke 21 facing away from the limit slot 25. In this way, the side of the magnetic yoke 21 and the side magnetic part 23 facing away from the diaphragm 31 are flush, which is convenient for installation.

[0083] In this embodiment, if Figure 3 As shown, the surface of the first protrusion 2212 facing away from the central magnetic conductive plate 222 and the surface of the second protrusion 2314 facing away from the side magnetic conductive plate 232 are both flush with the side of the magnetic conductive yoke 21 facing away from the limiting groove 25 .

[0084] In one embodiment, the depth of the first groove 2211 along the vibration direction of the vibration system 3 is defined as the depth of the first groove 2211 , and the depth of the first groove 2211 is greater than or equal to the thickness of the magnetic yoke 21 along the vibration direction of the vibration system 3 .

[0085] In this embodiment, if Figure 3 , Figure 5 and Figure 8 As shown, the first groove 2211 includes a first bottom wall and a first side wall arranged at an angle, the first side wall extends along the vibration direction of the vibration system 3, the first bottom wall extends perpendicular to the vibration direction of the vibration system 3, and is close to the magnetic gap 24, so that the first side wall forms the outer peripheral side wall of the first convex portion 2212. Optionally, the first bottom wall and the first side wall are arranged vertically.

[0086] It can be understood that the extension length of the first side wall along the vibration direction of the vibration system 3 is the thickness of the first convex portion 2212 along the vibration direction of the vibration system 3. In this embodiment, the depth of the first groove 2211 along the vibration direction of the vibration system 3 is defined as the depth of the first groove 2211, that is, the depth of the first groove 2211 is the extension length of the first side wall along the vibration direction of the vibration system 3.

[0087] Optionally, the depth of the first groove 2211 is greater than or equal to the thickness of the magnetic yoke 21 along the vibration direction of the vibration system 3. That is, the extension length of the first side wall is greater than or equal to the thickness of the magnetic yoke 21 along the vibration direction of the vibration system 3. In this way, the volume of the central magnet 221 can be further increased.

[0088] In one embodiment, the depth of the second groove 2313 along the vibration direction of the vibration system 3 is defined as the depth of the second groove 2313 , and the depth of the second groove 2313 is greater than or equal to the thickness of the magnetic yoke 21 along the vibration direction of the vibration system 3 .

[0089] In this embodiment, if Figure 3 , Figure 4 , Figure 5 and Fig. 9 As shown, the second groove 2313 includes a second bottom wall and a second side wall arranged at an angle, the second side wall extends along the vibration direction of the vibration system 3, the second bottom wall extends perpendicular to the vibration direction of the vibration system 3, and is close to the magnetic gap 24, so that the second side wall forms the inner peripheral side wall of the second convex portion 2314. Optionally, the second bottom wall and the second side wall are arranged vertically.

[0090] It can be understood that the extension length of the second side wall along the vibration direction of the vibration system 3 is the thickness of the second convex portion 2314 along the vibration direction of the vibration system 3. In this embodiment, the depth of the second groove 2313 along the vibration direction of the vibration system 3 is defined as the depth of the second groove 2313, that is, the depth of the second groove 2313 is the extension length of the second side wall along the vibration direction of the vibration system 3.

[0091] Optionally, the depth of the second groove 2313 is greater than or equal to the thickness of the magnetic yoke 21 along the vibration direction of the vibration system 3. That is, the extension length of the second side wall is greater than or equal to the thickness of the magnetic yoke 21 along the vibration direction of the vibration system 3. In this way, the volume of the side magnet 231 can be further increased.

[0092] In this embodiment, if Figure 3 and Figure 5 As shown, the depth of the first groove 2211 is optionally equal to the depth of the second groove 2313 .

[0093] In one embodiment, the central magnet 221 is rectangular, and the central magnet 221 has a long side and a short side. The length of the long side is defined as L1, the length of the short side is defined as L2, the length of the first protrusion 2212 extending along the long side is defined as the length d1 of the first protrusion 2212, and the length of the first protrusion 2212 extending along the short side is defined as the width d2 of the first protrusion 2212; wherein, 0.1mm≤d1≤(L1-0.1mm), 0.1mm≤d2≤(L2-0.1mm).

[0094] In this embodiment, if Figure 7 and Figure 8 As shown, the center magnet 221 is rectangular, and the first protrusion 2212 may be optionally rectangular. By setting the length d1 of the first protrusion 2212 to 0.1 mm~(the length of the long side L1-0.1 mm), and the width d2 of the first protrusion 2212 to 0.1 mm~(the length of the short side L2-0.1 mm), it is possible to ensure that the size of the center magnet 221 is increased and the size of the first groove 2211 is formed, so that the magnetic yoke 21 is limited in the first groove 2211, thereby ensuring the connection stability between the magnetic yoke 21 and the center magnet 221.

[0095] In one embodiment, the magnetic yoke 21 includes a main body 211 and a side portion 212 which are arranged at an angle, the side portion 212 extends toward the direction of the diaphragm 31, the main body 211 is provided with a through hole 2111, the main body 211 is limited in the limiting groove 25, and the first protrusion 2212 is penetrated through the through hole 2111, and the second protrusion 2314 is surrounded and arranged on the outer side of the main body 211; the side magnetic portion 23 is provided with an avoidance space 233, and the side portion 212 is connected to the outer shell 1 through the avoidance space 233.

[0096] In this embodiment, if Figure 2 , Figure 4 As shown, by setting a through hole 2111 on the main body 211 of the magnetic yoke 21, when the main body 211 is limited in the limiting groove 25, the first protrusion 2212 is passed through the through hole 2111. In this way, the sound-generating device 100 makes full use of the existing structure of the magnetic circuit system 2, and increases the volume of the side magnetic part 23 and the center magnetic part 22 by changing or reducing the structure of the magnetic yoke 21, thereby increasing the magnetic field strength of the magnetic circuit system 2, effectively increasing the BL value, and improving the acoustic performance.

[0097] It can be understood that the shape profile of the through hole 2111 is similar to the outer profile of the first protrusion 2212. Optionally, the through hole 2111 is a rectangular hole. In this embodiment, the main body 211 of the magnetic yoke 21 can be optionally a rectangular frame structure, so that the through hole 2111 is formed in the center of the main body 211, that is, the main body 211 of the magnetic yoke 21 includes two first connecting parts 2113 and two second connecting parts 2114 connected end to end, so that the two first connecting parts 2113 and the two second connecting parts 2114 enclose the through hole 2111.

[0098] In this embodiment, the magnetic yoke 21 is arranged to include a main body portion 211 and a side portion 212 arranged at an angle, so that the side portion 212 extends toward the diaphragm 31, and an escape space 233 is provided in the edge magnetic portion 23. This facilitates the side portion 212 to pass through the escape space 233 and connect with the outer shell 1, thereby further improving the installation stability of the magnetic yoke 21.

[0099] It can be understood that the side magnetic parts 23 include four, and the four side magnetic parts 23 are arranged at intervals and around the outside of the central magnetic part 22, so that two adjacent side magnetic parts 23 are spaced to form an escape space 233. In this embodiment, the four side magnetic parts 23 correspond to the two first connecting parts 2113 and the two second connecting parts 2114 of the main body 211 of the magnetic yoke 21 respectively.

[0100] Optionally, the magnetic yoke 21 includes four side portions 212, each of which is connected to a connection point between a first connection portion 2113 and a second connection portion 2114, and extends toward a direction close to the diaphragm 31, and each of which is located in an escape space 233. In this embodiment, the first connection portion 2113 or the second connection portion 2114 of the main body 211 extends toward the escape space 233 to form an extension portion 2115, and the side portion 212 is connected to the extension portion 2115.

[0101] In one embodiment, a fixed groove 2315 connected to the magnetic gap 24 is provided on the side of the edge magnet 231 facing the edge magnetic conductive plate 232, the edge magnetic conductive plate 232 is disposed in the fixed groove 2315, and the edge magnet 231 is connected to the outer shell 1; wherein, the fixed groove 2315 is arranged around the magnetic gap 24 to form a third protrusion 2316 on the side of the edge magnet 231 facing the diaphragm 31, and the third protrusion 2316 is located on the side of the fixed groove 2315 away from the magnetic gap 24.

[0102] In this embodiment, if Figures 3 to 7 , Fig. 9 As shown, a third protrusion 2316 is formed by protruding on the side of the side magnet 231 facing the diaphragm 31 toward the direction close to the diaphragm 31, so that the third protrusion 2316 and the inner peripheral edge of the side magnet 231 facing the diaphragm 31 close to the magnetic gap 24 form a fixing groove 2315. In this way, the fixing groove 2315 can be used to install the fixed side magnetic conductive plate 232, and the third protrusion 2316 formed by the protrusion can be used to further increase the volume and size of the side magnet 231, thereby effectively improving the magnetic field strength and increasing the BL value, thereby improving the acoustic performance.

[0103] It can be understood that when the side magnet part 23 includes a plurality of side magnet parts, each side magnet 231 of each side magnet part 23 is provided with a fixing groove 2315. Optionally, the third protrusion 2316 is located at a side of the fixing groove 2315 away from the magnetic gap 24.

[0104] In this embodiment, if Figure 3 , Figure 5 , Fig. 9 As shown, the fixing groove 2315 includes a third bottom wall and a third side wall arranged at an angle, the third side wall extends along the vibration direction of the vibration system 3, and the third bottom wall extends perpendicular to the vibration direction of the vibration system 3 and is close to the magnetic gap 24, so that the third side wall forms the inner side wall of the third protrusion 2316. Optionally, the third bottom wall and the third side wall are arranged vertically.

[0105] It can be understood that the extension length of the third side wall along the vibration direction of the vibration system 3 is the thickness of the third protrusion 2316 along the vibration direction of the vibration system 3, that is, the depth of the fixing groove 2315 along the vibration direction of the vibration system 3. Optionally, the extension length of the third side wall is less than or equal to the thickness of the side magnetic conductive plate 232 along the vibration direction of the vibration system 3. That is, the thickness of the third protrusion 2316 along the vibration direction of the vibration system 3 is less than or equal to the thickness of the side magnetic conductive plate 232 along the vibration direction of the vibration system 3.

[0106] In one embodiment, the outer shell 1 includes a vertical wall 11 and a straight portion 12 formed by extending inward from one end of the vertical wall 11, and the periphery of the diaphragm 31 is connected to one end of the vertical wall 11 away from the straight portion 12; the side magnet 231 is provided with a third groove 2319 corresponding to the straight portion 12, and the straight portion 12 is limited in the third groove 2319; wherein the third protrusion 2316 is located between the third groove 2319 and the fixing groove 2315.

[0107] In this embodiment, if Figure 3 and Figure 4 As shown, by setting the housing 1 as a vertical wall 11 and a straight portion 12, the straight portion 12 is formed by extending from one end of the vertical wall 11 toward the inside, so that the straight portion 12 is connected to the side magnet 231 to increase the contact area between the housing 1 and the side magnet 231 and improve the connection stability. It can be understood that the periphery of the diaphragm 31 is connected to the end of the vertical wall 11 away from the straight portion 12, and the straight portion 12 is connected to the side of the side magnet 231 facing the diaphragm 31.

[0108] In order to further improve the connection stability, a third groove 2319 is provided in the side magnet 231 corresponding to the straight portion 12, and the straight portion 12 is limited in the third groove 2319. In this way, the third groove 2319 can be used to realize the installation positioning of the straight portion 12 of the outer shell 1, and the side wall and bottom wall of the third groove 2319 can be used to increase the contact area with the straight portion 12, thereby improving the connection stability.

[0109] Optionally, the third protrusion 2316 is located between the third groove 2319 and the fixing groove 2315. That is, the center of the side of the side magnet 231 facing the diaphragm 31 is raised toward the direction close to the diaphragm 31 to form the third protrusion 2316, so that the third protrusion 2316 and the inner side of the side of the side magnet 231 facing the diaphragm 31 close to the magnetic gap 24 form the fixing groove 2315, and the third protrusion 2316 and the outer periphery of the side of the side magnet 231 facing the diaphragm 31 form the third groove 2319.

[0110] In this embodiment, when the edge magnet part 23 is a closed ring structure, the third groove 2319 is arranged around the periphery of the edge magnet part 23. Of course, when the edge magnet part 23 includes multiple edge magnet parts, each edge magnet part 23 is provided with a third groove 2319, which is not limited here.

[0111] In one embodiment, the center magnet 221 is rectangular, and the center magnet 221 has two long sides and two short sides. The side magnets 231 include two first side magnets 2311 and two second side magnets 2312. The two first side magnets 2311 correspond to the two long sides respectively, and the two second side magnets 2312 correspond to the two short sides respectively. The third protrusion 2316 includes a first sub-protrusion 2317 provided on the first side magnet 2311 and a second sub-protrusion 2318 provided on the second side magnet 2312.

[0112] In this embodiment, if Figures 5 to 7 As shown, the central magnetic part 22 may be rectangular, and the side magnetic parts 23 include four, and the four side magnetic parts 23 are respectively arranged corresponding to the four sides of the central magnetic part 22. Optionally, two adjacent side magnetic parts 23 are spaced to form an escape space 233. That is, the adjacent first side magnet 2311 and the second side magnet 2312 of the side magnet 231 are spaced to form an escape space 233.

[0113] Alternatively, if Figure 6 As shown, the length of the first side magnet 2311 extending along the long side direction is defined as A1, the length of the first side magnet 2311 extending along the short side direction is defined as A2, the length of the first sub-protrusion 2317 extending along the long side direction is defined as a1, and the length of the first sub-protrusion 2317 extending along the short side direction is defined as a2, 0.1mm≤a1≤A1, 0.1mm≤a2≤(A2-0.1mm).

[0114] It can be understood that such a configuration can ensure the size of the first sub-protrusion 2317 on the first side magnet 2311 to increase the volume of the side magnet 231, and can also ensure the size of the fixing groove 2315 and the third groove 2319 formed on the first side magnet 2311 to facilitate the installation of the side magnetic conductive plate 232 and the straight portion 12 of the outer shell 1.

[0115] Alternatively, if Figure 6 As shown, the length of the second side magnet 2312 extending along the short side direction is defined as B1, the length of the second side magnet 2312 extending along the long side direction is defined as B2, the length of the second sub-protrusion 2318 extending along the short side direction is defined as b1, and the length of the second sub-protrusion 2318 extending along the long side direction is defined as b2, 0.1mm≤b1≤B1, 0.1mm≤b2≤(B2-0.1mm).

[0116] It can be understood that such a configuration can ensure the size of the second sub-protrusion 2318 on the second side magnet 2312 to increase the volume of the side magnet 231, and can also ensure the size of the fixing groove 2315 and the third groove 2319 formed on the second side magnet 2312 to facilitate the installation of the side magnetic conductive plate 232 and the straight portion 12 of the outer shell 1.

[0117] In one embodiment, the edge magnet portion 23 is provided with an escape space 233 connecting the magnetic gap 24 and the limit groove 25; the vibration system 3 also includes a centering support plate 33, the centering support plate 33 includes an external connection portion 331, an internal connection portion 332 and an elastic 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, the internal connection portion 332 passes through the escape space 233 and extends into the magnetic gap 24, and is connected to the voice coil 32.

[0118] In this embodiment, if Figure 2 and Figure 4 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 passes through the avoidance space 233 and extends into the magnetic gap 24 and 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.

[0119] It can be understood that the two ends of the centering support 33 are electrically connected to the lead wires 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, and the centering support 33 is located at the four corners of the sound-generating device 100 or in the short axis or long axis direction of the sound-generating device 100. Of course, the centering support 33 can also be arranged at the top of the voice coil 32, and the centering support 33 is located between the voice coil 32 and the diaphragm 31, which is not limited here.

[0120] Optionally, there may be one or more centering support pieces 33. When there are multiple centering support pieces 33, the multiple centering support pieces 33 are distributed along the long axis direction and / or the short axis direction of the magnetic circuit system 2 and / or the four corners of the magnetic circuit system 2.

[0121] It can be understood that the plurality of centering supports 33 can be symmetrically distributed along the long axis direction of the magnetic circuit system 2; the plurality of centering supports 33 can also be symmetrically distributed along the short axis direction of the magnetic circuit system 2; the plurality of centering supports 33 can also be correspondingly arranged at the four corners of the magnetic circuit system 2. Of course, in other embodiments, the plurality of centering supports 33 can be correspondingly distributed along the long axis direction of the magnetic circuit system 2, the short axis direction of the magnetic circuit system 2, and the diagonal or four corner positions of the magnetic circuit system 2, which is not limited here.

[0122] In this embodiment, the centering support pieces 33 may optionally include two or four. Such an arrangement can not only utilize the centering support pieces 33 to connect the voice coil 32 to the external circuit, but also ensure the vibration balance of the sound-generating device 100 .

[0123] In one embodiment, the central magnetic portion 22 is arranged in a rectangular shape, and the central magnetic portion 22 has two long sides and two short sides connected end to end, and the connection between the long sides and the short sides forms a corner. The side magnetic portions 23 include four, and the four side magnetic portions 23 correspond to the two long sides and the two short sides respectively. An escape space 233 is formed between two adjacent side magnetic portions 23, and each escape space 233 corresponds to a corner; the centering support pieces 33 include four, and each centering support piece 33 is arranged corresponding to an escape space 233.

[0124] In this embodiment, the outer connecting portion 331, the elastic 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 portion 333 can optionally include at least one bend. Optionally, the outer connecting portion 331, the elastic portion 333 and the inner connecting portion 332 of the centering support 33 are located in the same plane.

[0125] In order to facilitate the electrical connection between the centering support 33 and the voice coil 32 , in the present embodiment, the inner connecting portion 332 of the centering support 33 is provided with an inner soldering pad 334 , and the inner soldering pad 334 is electrically connected to the lead of the voice coil 32 .

[0126] In one embodiment, the magnetic yoke 21 is provided with an escape area 2112 corresponding to the inner connecting portion 332. It can be understood that Figure 4 As shown, by providing an avoidance area 2112 on the magnetic yoke 21 , the avoidance area 2112 can be used to provide avoidance for the centering support 33 during the vibration of the voice coil 32 , ensuring that the inner connecting portion 332 of the centering support 33 will not touch the magnetic yoke 21 .

[0127] Optionally, the avoidance area 2112 is a recessed groove or a through hole. It can be understood that the avoidance area 2112 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 2112 is a through hole, that is, the through hole passes through the magnetic yoke 21; at the same time, the avoidance area 2112 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 31, thereby ensuring the balance of internal and external air pressures.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] It is understandable that the electronic device can 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 can be assembled into the housing of the electronic device in the form of a module, or it can be assembled into the housing of the electronic device in the form of a monomer. The electronic device can be a mobile phone, an MP3, an MP4, a tablet computer, a headset, a wearable device, etc., which are not listed one by one here.

[0133] 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 vibration system, the vibration system comprising a diaphragm and a voice coil connected to the diaphragm, the periphery of the diaphragm being connected to the housing; and A magnetic circuit system, wherein the magnetic circuit system is connected to the housing and is opposite to the diaphragm, the magnetic circuit system comprises a magnetic yoke, a central magnetic portion and a side magnetic portion, the side magnetic portion is arranged on the outside of the central magnetic portion and is spaced from the central magnetic portion to form a magnetic gap, one end of the voice coil is suspended in the magnetic gap, the side magnetic portion and the central magnetic portion form a limiting groove connected to the magnetic gap, the limiting groove is located on the side of the side magnetic portion and the central magnetic portion facing away from the diaphragm, and is arranged opposite to the magnetic gap, and at least a portion of the magnetic yoke is arranged in the limiting groove.

2. The sound-generating device according to claim 1, characterized in that: The central magnetic part comprises a stacked central magnet and a central magnetic conductive plate, and a first groove connected to the magnetic gap is provided on a side of the central magnet facing away from the central magnetic conductive plate; The edge magnet part comprises a stacked edge magnet and an edge magnetic conductive plate, and a second groove connected to the magnetic gap is provided on a side of the edge magnet facing away from the edge magnetic conductive plate; Wherein, the first groove and the second groove cooperate to form the limiting groove.

3. The sound-generating device according to claim 2, characterized in that: The first groove is arranged around the periphery of the central magnet to form a first convex portion on a side of the central magnet facing away from the central magnetic conductive plate; The second groove is arranged around the magnetic gap to form a second convex portion on the side of the side magnet facing away from the side magnetic conductive plate, and the second convex portion is located on the side of the second groove away from the magnetic gap.

4. The sound-generating device according to claim 3, characterized in that: The magnetic yoke comprises a main body and a side portion arranged at an angle, the side portion extends toward the direction of the diaphragm, the main body is provided with a through hole, the main body is limited in the limiting groove, the first convex portion is penetrated through the through hole, and the second convex portion is arranged around the outer side of the main body; The side magnetic part is provided with an escape space, and the side part passes through the escape space and is connected with the shell.

5. The sound generating device according to claim 3, characterized in that: The surface of the first protrusion facing away from the central magnetic conductive plate is flush with the side of the magnetic conductive yoke facing away from the limiting groove; And / or, the surface of the second protrusion facing away from the edge magnetic conductive plate is flush with the side of the magnetic conductive yoke facing away from the limiting groove; And / or, the central magnet is rectangular, the central magnet has a long side and a short side, the length of the long side is defined as L1, the length of the short side is defined as L2, the length of the first protrusion extending along the long side is defined as the length d1 of the first protrusion, and the length of the first protrusion extending along the short side is defined as the width d2 of the first protrusion; wherein, 0.1mm≤d1≤(L1-0.1mm), 0.1mm≤d2≤(L2-0.1mm).

6. The sound generating device according to claim 3, characterized in that: The depth of the first groove along the vibration direction of the vibration system is defined as the depth of the first groove, and the depth of the first groove is greater than or equal to the thickness of the magnetic yoke along the vibration direction of the vibration system; And / or, the depth of the second groove along the vibration direction of the vibration system is defined as the depth of the second groove, and the depth of the second groove is greater than or equal to the thickness of the magnetic yoke along the vibration direction of the vibration system.

7. The sound generating device according to claim 2, characterized in that: A fixing groove connected to the magnetic gap is provided on one side of the edge magnet facing the edge magnetic conductive plate, the edge magnetic conductive plate is arranged in the fixing groove, and the edge magnet is connected to the housing; The fixing groove is arranged around the magnetic gap to form a third convex portion on the side of the edge magnet facing the diaphragm, and the third convex portion is located on the side of the fixing groove away from the magnetic gap.

8. The sound generating device according to claim 7, characterized in that: The housing comprises a vertical wall and a straight portion formed by extending inward from one end of the vertical wall, and the periphery of the diaphragm is connected to one end of the vertical wall away from the straight portion; The side magnet is provided with a third groove corresponding to the straight portion, and the straight portion is confined in the third groove; Wherein, the third protrusion is located between the third groove and the fixing groove.

9. The sound-generating device according to claim 8, characterized in that: The central magnet is rectangular, and has two long sides and two short sides. The side magnets include two first side magnets and two second side magnets. The two first side magnets correspond to the two long sides respectively, and the two second side magnets correspond to the two short sides respectively. The third protrusion includes a first sub-protrusion provided on the first side magnet and a second sub-protrusion provided on the second side magnet. The length of the first side magnet extending along the long side direction is defined as A1, the length of the first side magnet extending along the short side direction is defined as A2, the length of the first sub-protrusion extending along the long side direction is defined as a1, the length of the first sub-protrusion extending along the short side direction is defined as a2, 0.1mm≤a1≤A1, 0.1mm≤a2≤(A2-0.1mm); Define the length of the second side magnet extending along the short side direction as B1, define the length of the second side magnet extending along the long side direction as B2, define the length of the second sub-protrusion extending along the short side direction as b1, and define the length of the second sub-protrusion extending along the long side direction as b2, 0.1mm≤b1≤B1, 0.1mm≤b2≤(B2-0.1mm).

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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