Sound production device and electronic device

Abstract

The application discloses a sound generating device and electronic equipment, and relates to the technical field of electroacoustic transduction. First and second diaphragms of a diaphragm assembly of the sound generating device are arranged at intervals along a first direction and are respectively connected with two ends of a voice coil along the first direction. A vibrating plate is located on the inner side of the voice coil. Two center magnets of a center magnetic part of a magnetic circuit system are oppositely arranged at intervals on opposite sides of the vibrating plate. The first and second diaphragms each comprise a deformation part and first and second ends arranged at two ends of the deformation part along the first direction. Two first ends are respectively connected with two ends of the voice coil. At least part of two second ends is respectively connected with a side magnetic part. The sound generating device is formed with a first cavity and a second cavity located on two sides of the vibrating plate along the first direction. The sound generating device is further provided with a first sound outlet and a second sound outlet respectively communicating with the first cavity and the second cavity. The sound generating device disclosed by the application effectively increases the BL value, improves the acoustic performance, and can reduce the problem of sound leakage in the far field.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electro-acoustic transduction, and in particular to a sound generating device and an electronic device using the same. BACKGROUND

[0002] In recent years, with the rapid development of consumer electronics, micro loudspeakers, as a common electro-acoustic transducer, are widely used in mobile phones, glasses, earphones, tablet computers and other fields, and these portable terminal products gradually form the application trend of multi-function, miniaturization and high performance.

[0003] In the related art, the loudspeaker applied to smart glasses is generally placed in the narrow internal space of the glasses leg near the ear, but the narrow internal space of the glasses leg limits the performance of the loudspeaker, resulting in low loudness of the loudspeaker, and the open sound field design of the loudspeaker in the glasses leg has a large sound leakage phenomenon, reducing the use experience of consumers. SUMMARY

[0004] The main purpose of the present application is to provide a sound generating device and an electronic device, aiming to provide a sound generating device with double-sided sound generation, which not only improves the BL value and the acoustic performance of the whole machine, but also effectively reduces the sound leakage problem in the far field.

[0005] To achieve the above purpose, the present application provides a sound generating device, which comprises:

[0006] a vibration system, the vibration system comprising a diaphragm assembly and a voice coil, the diaphragm assembly comprising a first diaphragm, a second diaphragm and a vibration plate, the first diaphragm and the second diaphragm both vibrate along a first direction, and the first diaphragm and the second diaphragm are spaced apart along the first direction and connected to both ends of the voice coil along the first direction respectively, the vibration plate is located on the inner side of the voice coil, and the outer periphery of the vibration plate is in abutting arrangement with the inner peripheral wall of the voice coil; and

[0007] a magnetic circuit system, the magnetic circuit system comprising a center magnetic part and a side magnetic part, the side magnetic part being arranged between the first diaphragm and the second diaphragm and located on the outer side of the voice coil, the center magnetic part comprising two center magnets arranged oppositely and spaced apart along the first direction, the two center magnets being located on both sides of the vibration plate along the first direction, and both the two center magnets being magnetized along the first direction and having opposite magnetization directions, the side magnetic part and the center magnetic part cooperating to form a magnetic gap accommodating the voice coil;

[0008] The first vibrating diaphragm and the second vibrating diaphragm each include a deformation portion and a first end and a second end arranged at two ends of the deformation portion along the first direction, two first ends are respectively connected with two ends of the voice coil, at least part of two second ends are respectively connected with the side magnetic portions, the sound generating device is formed with a first cavity and a second cavity located at two sides of the vibrating plate along the first direction, two center magnets are respectively exposed in the first cavity and the second cavity towards one side of the vibrating plate, and the sound generating device is further provided with a first sound outlet and a second sound outlet respectively communicating with the first cavity and the second cavity.

[0009] In an embodiment, the deformation portion is provided with at least one bending portion along the first direction, and an opening of the bending portion is towards a direction perpendicular to the first direction.

[0010] The first vibrating diaphragm and the vibrating plate radiate a first sound wave to the first cavity, the second vibrating diaphragm and the vibrating plate radiate a second sound wave to the second cavity, and phases of the first sound wave and the second sound wave are opposite.

[0011] In an embodiment, the voice coil includes two long sides connected in a head-to-tail manner and two short sides, the side magnetic portions include two, and the two side magnetic portions are symmetrically arranged at opposite sides of the voice coil and respectively extend along an extension direction of the long side.

[0012] The sound generating device further includes a shell, the shell is provided with a support portion corresponding to each short side, two ends of each support portion respectively extend towards two side magnetic portions and are enclosed with the two side magnetic portions to form a ring shape, and each second end is connected with the two side magnetic portions and the two support portions.

[0013] In an embodiment, the vibrating system further includes a first skeleton and a second skeleton, two ends of the first skeleton along the first direction are respectively connected with one first end and one end of the voice coil, and two ends of the second skeleton along the first direction are respectively connected with the other first end and the other end of the voice coil.

[0014] In an embodiment, one end of the first skeleton and / or the second skeleton adjacent to the first end is bent to extend towards the first end to form a first bending portion, and the first bending portion is connected with the first end; wherein a projection of the deformation portion along the first direction at least partially coincides with the first bending portion.

[0015] The first skeleton and / or the second skeleton are bent to extend adjacent to one end of the voice coil to form a second bending portion, the second bending portion is connected with an end of the voice coil; or the first skeleton and / or the second skeleton extend along an inner side surface of the voice coil adjacent to one end of the voice coil and are connected with the inner side surface of the voice coil.

[0016] And / or, along a direction perpendicular to the first direction, a first vibration gap is formed between the first skeleton and the second skeleton and the two deformation parts respectively.

[0017] In one embodiment, the vibration system further includes a bracket, the bracket being disposed on an inner side of the voice coil and extending along the first direction and protruding from two ends of the voice coil along the first direction, the two first ends being respectively connected to two ends of the bracket along the first direction, and the outer periphery of the vibration plate being connected to the bracket;

[0018] Wherein, the bracket is connected to the vibration plate by bonding or welding;

[0019] And / or, both ends of the bracket along the first direction are bent and extended to form edge portions, each edge portion is connected to one of the first ends; wherein the projection of the deformable portion along the first direction at least partially overlaps with the edge portion;

[0020] And / or, along a direction perpendicular to the first direction, a second vibration gap is formed between the bracket and the two deformation parts respectively.

[0021] In one embodiment, projections of the two central magnets along the first direction are located inside the voice coil;

[0022] And / or, the thickness of the edge magnet portion along the first direction is greater than the extension length of the voice coil along the first direction, and is not greater than 3 times the extension length of the voice coil along the first direction;

[0023] And / or, the first diaphragm and the second diaphragm are symmetrically arranged relative to the vibration plate;

[0024] And / or, the two central magnets are symmetrically arranged relative to the vibration plate;

[0025] And / or, the voice coil is an integrally wound structure and extends along the first direction; or, the voice coil includes a first sub-voice coil and a second sub-voice coil provided on opposite sides of the vibration plate;

[0026] And / or, a peripheral edge of the vibration plate is bent and extended toward the inner surface of the voice coil to form an extension portion, and the extension portion is connected to the inner surface of the voice coil.

[0027] In one embodiment, the edge magnet portion includes two edge magnets stacked along the first direction and an edge magnetic conductive plate disposed between the two edge magnets, and the two second ends are respectively connected to the sides of the two edge magnets facing away from the edge magnetic conductive plate;

[0028] The two side magnets are magnetized along the first direction and have opposite magnetization directions, and the magnetic poles of the two ends of the two side magnets away from each other are opposite to the magnetic poles of the two ends of the two center magnets away from each other.

[0029] In an embodiment, the magnetic circuit system further comprises a first magnetic yoke and a second magnetic yoke arranged oppositely, the two center magnets comprise a first center magnet and a second center magnet, the side of the first center magnet away from the vibrating plate is connected with the first magnetic yoke, and the side of the second center magnet away from the vibrating plate is connected with the second magnetic yoke.

[0030] The first vibrating diaphragm, the voice coil, the vibrating plate, the first magnetic yoke and the first sound hole form the first cavity, and the second vibrating diaphragm, the voice coil, the vibrating plate, the second magnetic yoke and the second sound hole form the second cavity.

[0031] In an embodiment, the sound generating device further comprises a housing, the housing is located between the first magnetic yoke and the second magnetic yoke, the side magnetic part is connected with the housing, and the housing and the two deformation parts have third vibrating gaps in the direction perpendicular to the first direction, and the two third vibrating gaps are respectively communicated with the first cavity and the second cavity.

[0032] The housing, the side magnetic part, the first vibrating diaphragm, the voice coil and the second vibrating diaphragm cooperatively form a third cavity, and the sound generating device is provided with a gas leakage hole communicated with the third cavity.

[0033] In an embodiment, the housing comprises a first housing and a second housing arranged along the first direction, two ends of the first housing are respectively connected with the side magnetic part and the first magnetic yoke, two ends of the second housing are respectively connected with the side magnetic part and the second magnetic yoke, the first housing and one of the deformation parts have one of the third vibrating gaps, and the third vibrating gap is communicated with the first cavity, and the second housing and the other of the deformation parts have one of the third vibrating gaps, and the third vibrating gap is communicated with the second cavity.

[0034] The first housing or the second housing or the first housing and the second housing are provided with the gas leakage hole.

[0035] In an embodiment, the first magnetic yoke comprises a first top plate part and a first side plate part arranged at an included angle, the first center magnet is arranged on the first top plate part, and one end of the first side plate part away from the first top plate part is connected with the housing.

[0036] The second magnetic yoke includes a second top plate portion and a second side plate portion arranged at an angle, the second central magnet is arranged on the second top plate portion, and one end of the second side plate portion away from the second top plate portion is connected to the housing;

[0037] Wherein, the first top plate portion and / or the first side plate portion is provided with the first sound outlet hole, and the second top plate portion and / or the second side plate portion is provided with the second sound outlet hole.

[0038] The present invention also provides an electronic device, comprising the above-mentioned sound-generating device;

[0039] The electronic device is provided with an installation cavity and a first sound outlet and a second sound outlet connected to the installation cavity. The sound-emitting device is provided in the installation cavity. The first sound outlet of the sound-emitting device is connected to the first sound outlet, and the second sound outlet of the sound-emitting device is connected to the second sound outlet.

[0040] In one embodiment, the electronic device is a pair of smart glasses, the smart glasses include temples, and the temples are provided with the mounting cavity, the first sound outlet, and the second sound outlet;

[0041] The first sound outlet and the second sound outlet are located on two opposite surfaces of the glasses leg along the first direction, and one of the surfaces faces the ear of the user.

[0042] The sound-generating device of the technical solution of the present invention is configured by setting the diaphragm assembly of the vibration system to be a first diaphragm, a second diaphragm and a vibration plate, using the first diaphragm and the second diaphragm to be spaced apart along a first direction and respectively connected to the two ends of the voice coil along the first direction, and the vibration plate is arranged on the inner side of the voice coil so that the outer periphery of the vibration plate is arranged against the inner circumferential wall of the voice coil, thus forming a first cavity and a second cavity located on both sides of the vibration plate along the first direction in the sound-generating device, and providing a first sound outlet and a second sound outlet respectively communicating with the first cavity and the second cavity in the sound-generating device, thereby realizing that the dual diaphragms are connected and driven by one voice coil, thereby realizing that the dual diaphragms are connected and driven by the ... The first diaphragm and the second diaphragm are both vibrated along the first direction, which can ensure the loudness consistency of the dual-diaphragm structure, and the phases of the sound waves in the two cavities are completely opposite, so that both sides of the sound-emitting device can directly emit sound, and the sound-emitting device is placed in the glasses leg of the whole machine to form a "true" dipole up and down, which reduces far-field leakage and ensures privacy, and the first diaphragm and the second diaphragm are both set as deformation parts and the first end and the second end are set at both ends of the deformation part along the first direction, so that the two first ends are respectively connected to the two ends of the voice coil along the first direction, and at least part of the two second ends are respectively connected to the edge magnetic part, that is, the first The diaphragm and the second diaphragm are arranged as a vertical diaphragm structure, thereby increasing the effective vibration area and further improving the sound effect and acoustic performance of the sound-producing device; at the same time, by arranging the side magnetic part of the magnetic circuit system between the first diaphragm and the second diaphragm, and located on the outside of the voice coil, and the two central magnets of the central magnetic part are arranged oppositely and spaced along the first direction, and are located on both sides of the vibration plate along the first direction, so that the two central magnets are magnetized along the first direction and the magnetization directions are opposite, and the two central magnets are exposed to the first cavity and the second cavity respectively on the side facing the vibration plate, so that the magnetic structure formed by the two central magnets is used to enhance the sound. The magnetic field strength in the area where the voice coil is located is increased, thereby enhancing the magnetic force acting on the voice coil. Furthermore, within the magnetic gap formed by the side and center magnets, the two center magnets form a counter-magnetic structure that works in conjunction with the side magnets. This increases the magnetic force acting on the voice coil, and the magnetic lines of force are highly concentrated near the voice coil, increasing the magnetic field driving force acting on the voice coil, effectively increasing the BL value, and thus improving performance and the acoustic performance of the sound-generating device. Furthermore, the two center magnets eliminate the conventional center washer structure, which not only achieves a thinner design, but also makes the magnetic lines of force more evenly distributed and the BL(x) curve flatter, thereby reducing distortion. Furthermore, under the same volume requirements, the lack of a center washer structure allows the two center magnets to be made larger, thereby improving the product's BL value. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0044] Figure 1 A schematic structural diagram of an embodiment of a sound-generating device provided by the present invention;

[0045] Figure 2 A schematic top view of the structure of an embodiment of the sound-generating device provided by the present invention;

[0046] Figure 3 An exploded schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0047] Figure 4 A cross-sectional schematic diagram of a first embodiment of the sound-generating device provided by the present invention;

[0048] Figure 5 A cross-sectional schematic diagram of the first embodiment of the sound-generating device provided by the present invention from another perspective;

[0049] Figure 6 A partial cross-sectional schematic diagram of a first embodiment of the sound-generating device provided by the present invention;

[0050] Figure 7 A cross-sectional schematic diagram of a second embodiment of the sound-generating device provided by the present invention;

[0051] Figure 8 A cross-sectional schematic diagram of a third embodiment of the sound-generating device provided by the present invention;

[0052] Figure 9 A schematic cross-sectional view of a fourth embodiment of the sound-generating device provided by the present invention;

[0053] Figure 10 A cross-sectional schematic diagram of a fifth embodiment of the sound-generating device provided by the present invention;

[0054] Figure 11 A cross-sectional schematic diagram of a vibration system in an embodiment of a sound-generating device provided by the present invention;

[0055] Figure 12 A cross-sectional schematic diagram of the connection between the voice coil, the bracket and the vibration plate in one embodiment of the sound-generating device provided by the present invention;

[0056] Figure 13 A cross-sectional schematic diagram of the connection between the voice coil and the vibration plate in one embodiment of the sound-generating device provided by the present invention;

[0057] Figure 14 A cross-sectional view of the connection between the voice coil and the vibrating plate in another embodiment of the sound production device provided by the present application;

[0058] Figure 15 A structural view of an embodiment of the first diaphragm and the second diaphragm provided by the present application;

[0059] Figure 16 A cross-sectional view of the connection between the vibrating plate and the magnetic conducting layer in an embodiment of the sound production device provided by the present application;

[0060] Figure 17 A cross-sectional view of the connection between the vibrating plate and the magnetic conducting layer in another embodiment of the sound production device provided by the present application;

[0061] Figure 18 A cross-sectional view of the connection between the vibrating plate and the magnetic conducting member in an embodiment of the sound production device provided by the present application;

[0062] Figure 19 A cross-sectional view of the connection between the vibrating plate and the magnetic conducting member in another embodiment of the sound production device provided by the present application;

[0063] Figure 20 A simulation effect view of an embodiment of the sound production device provided by the present application;

[0064] Figure 21 A BL curve view of the sound production device provided by the present application and the prior art.

[0065] BRIEF DESCRIPTION OF THE DRAWINGS

[0066] 100, sound production device; 1, shell; 11, first shell; 12, second shell; 13, third cavity; 14, air vent; 15, mounting hole; 16, first support part; 17, second support part; 2, vibration system; 21, diaphragm assembly; 211, first diaphragm; 2111, inner connecting part; 2112, folded ring part; 2113, outer connecting part; 2114, first end; 2115, second end; 2116, deformation part; 212, second diaphragm; 213, vibration plate; 2131, extension part; 2132, magnetic conducting layer; 2133, magnetic conducting piece; 22, voice coil; 221, long side; 222, short side; 223, first sub voice coil; 224, second sub voice coil; 231, first framework; 232, second framework; 233, first bending part; 234, second bending part; 24, support; 241, edge part; 25, centering support sheet; 251, outer fixing part; 252, inner fixing part; 253, elastic arm part; 3, magnetic circuit system; 31, first magnetic yoke; 311, first top plate part; 312, first side plate part; 313, first sound hole; 314, first cavity; 32, second magnetic yoke; 321, second top plate part; 322, second side plate part; 323, second sound hole; 324, second cavity; 33, center magnetic part; 331, center magnet; 3311, first center magnet; 3312, second center magnet; 34, edge magnetic part; 341, edge magnet; 342, edge magnetic conducting plate; 343, first edge magnet; 344, second edge magnet; 345, third edge magnet; 35, magnetic gap.

[0067] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0069] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indications also change accordingly.

[0070] Meanwhile, the meaning of “and / or” or “and / or” appearing throughout the text is that it includes three schemes. Taking “A and / or B” as an example, it includes A scheme, or B scheme, or A and B schemes.

[0071] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not 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 such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0072] In recent years, with the rapid development of consumer electronics, electronic devices such as smartphones, smart glasses, and VR / AR products have gradually gained consumer acceptance and are widely used in daily life. Micro speakers, as a common electroacoustic transducer device, are widely used in mobile phones, glasses, headphones, tablets, and other fields. These portable terminal products are gradually forming an application trend of multifunctionality, miniaturization, and high performance. As the performance of electronic products improves, the acoustic performance of speakers is also inevitably improved.

[0073] In related technologies, the speakers used in smart glasses are generally placed in the temples near the ears, but the narrow internal space of the temples limits the performance of the speakers, resulting in lower loudness of the speakers; at the same time, the position of the sound holes on the temples is usually a certain distance away from the ear canal, which causes a certain degree of attenuation of the loudness transmitted into the ear canal; at the same time, because this propagation mode is approximately an open sound field, the speakers are also radiating sound outward, resulting in a certain amount of leakage in the far field, a large sound leakage phenomenon, poor privacy, and reduced consumer experience.

[0074] 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, which may be mobile phones, headphones, smart wearable devices, smart glasses, etc., without limitation herein. The sound-emitting device 100 of the present invention is a double-sided speaker structure with advantages such as high performance and low sound leakage. When applied to glasses, it can perfectly meet the current market demand for eyewear products. In addition, the materials and assembly processes of the various components in the sound-emitting device 100 are simple, highly mature, and highly manufacturable.

[0075] Please refer to Figures 1 to 19As shown, in an embodiment of the present invention, the sound-generating device 100 includes a vibration system 2 and a magnetic circuit system 3. The vibration system 2 includes a diaphragm assembly 21 and a voice coil 22. The diaphragm assembly 21 includes a first diaphragm 211, a second diaphragm 212 and a vibration plate 213. The first diaphragm 211 and the second diaphragm 212 both vibrate along a first direction, and the first diaphragm 211 and the second diaphragm 212 are spaced apart along the first direction and are respectively connected to the two ends of the voice coil 22 along the first direction. The vibration plate 213 is located on the inner side of the voice coil 22, and the outer periphery of the vibration plate 213 is arranged to abut against the inner circumferential wall of the voice coil 22. The magnetic circuit system 3 includes a central magnetic portion 33 and a side magnetic portion 34. The side magnetic portion 34 is arranged between the first diaphragm 211 and the second diaphragm 212 and is located on the outer side of the voice coil 22. The central magnetic portion 33 includes two central magnets 331 that are opposite to each other and spaced apart along a first direction. The two central magnets 331 are located on both sides of the vibration plate 213 along the first direction, and the two central magnets 331 are magnetized along the first direction and in opposite directions. The side magnetic portion 34 cooperates with the central magnetic portion 33 to form a magnetic gap 35 for accommodating the voice coil 22. The sound-emitting device 100 is formed with a first cavity 314 and a second cavity 324 located on both sides of the vibration plate 213 along the first direction. The two central magnets 331 are exposed in the first cavity 314 and the second cavity 324 respectively on the side facing the vibration plate 213. The sound-emitting device 100 is also provided with a first sound outlet 313 and a second sound outlet 323 that are connected to the first cavity 314 and the second cavity 324 respectively.

[0076] In this embodiment, the sound-generating device 100 is a micro-speaker. The sound-generating device 100 also includes a housing 1, and the magnetic circuit system 3 and the vibration system 2 of the sound-generating device 100 can be installed and fixed through the housing 1, that is, the magnetic circuit system 3 and the vibration system 2 are fixed to the housing 1, so that the sound-generating device 100 is used as an independent component in an electronic device or a sound-generating module, which is not limited here. Of course, in other embodiments, the outer periphery of the diaphragm assembly 21 in the vibration system 2 can be directly fixed to the magnetic circuit system 3; or, the magnetic circuit system 3 and the vibration system 2 of the sound-generating device 100 can be installed as a separate structure in the housing of the electronic device or the sound-generating module, which is not limited here.

[0077] Optionally, the outer contour of the sound-generating device 100 can be circular or square, so that the outer contours of the housing 1, the magnetic circuit system 3, and the vibration system 2 are correspondingly set to be circular or square, and the specific design is based on actual needs and is not limited here. In this embodiment, the housing 1 can be optionally a frame or frame structure, that is, the housing 1 has a cavity with two ends open, the magnetic circuit system 3 is connected to the housing 1, and the vibration system 2 is connected to the housing 1 and is opposite to and spaced from the magnetic circuit system 3. The housing 1 can be a steel sheet structure or a plastic structure, which is not limited here.

[0078] Optionally, the housing 1 can be a single unit or comprised of multiple separate units, which is not a limitation herein. It is understood that the housing 1 is provided with conductive terminals, and the voice coil 22 is electrically connected to the conductive terminals, thereby facilitating the connection of the voice coil 22 to an external circuit via the conductive terminals.

[0079] In this embodiment, if Figures 3 to 7 、 Figure 11 As shown, by setting the diaphragm assembly 21 of the vibration system 2 to be a first diaphragm 211, a second diaphragm 212 and a vibration plate 213, the first diaphragm 211 and the second diaphragm 212 are spaced apart along the first direction and are respectively connected to the two ends of the voice coil 22 along the first direction, and the vibration plate 213 is located on the inner side of the voice coil 22, and the outer periphery of the vibration plate 213 is arranged against the inner peripheral wall of the voice coil 22, so that a first cavity 314 and a second cavity 324 are formed on both sides of the vibration plate 213 along the first direction in the sound-emitting device 100, and a first sound outlet 313 and a second sound outlet 323 are provided in the sound-emitting device 100, which are connected to the first cavity 314 and the second cavity 324 respectively. The dual-diaphragm structure is connected to the vibration plate 213 through a voice coil 22 to drive the vibration. This ensures that the loudness of the sound waves in the two cavities is consistent and the phases are completely opposite. That is, the first diaphragm 211 and the second diaphragm 212 radiate equal and opposite-phase sound waves to the first cavity 314 and the second cavity 324 respectively. In this way, the first cavity 314 and the second cavity 324 radiate equal and opposite-phase sound waves outward through the first sound outlet 313 and the second sound outlet 323 respectively. According to the superposition effect of dipoles, the two opposite-phase sound waves in the far field can be offset to the greatest extent, greatly improving the sound leakage problem of the sound-emitting device 100 during use, protecting the user's privacy, and improving the user experience. Placing the sound-emitting device 100 in the glasses leg of the whole machine can form a "true" dipole up and down, reducing far-field leakage and ensuring privacy.

[0080] It should be noted that the first diaphragm 211 and the second diaphragm 212 are directly connected to both ends of the voice coil 22 along the first direction, for example, the inner side of the first diaphragm 211 is directly connected to one end of the voice coil 22, and the inner side of the second diaphragm 212 is directly connected to the other end of the voice coil 22. Of course, the first diaphragm 211 and the second diaphragm 212 can be indirectly connected to both ends of the voice coil 22 along the first direction, for example, the inner side of the first diaphragm 211 is connected to one end of the voice coil 22 via a bracket or a frame, and the inner side of the second diaphragm 212 is connected to the other end of the voice coil 22 via a bracket or a frame, which is not limited here.

[0081] Understandably, Figure 1 、 Figure 3 、 Figures 5 to 10As shown, by arranging the side magnetic portion 34 of the magnetic circuit system 3 between the first diaphragm 211 and the second diaphragm 212 and located on the outside of the voice coil 22, and the two center magnets 331 of the center magnetic portion 33 are arranged oppositely and spaced along the first direction, and are located on opposite sides of the vibration plate 213 along the first direction, so that the two center magnets 331 are magnetized along the first direction and the magnetization directions are opposite, and the two center magnets 331 are exposed to the first cavity 314 and the second cavity 324 respectively on the side facing the vibration plate 213. In this way, the two center magnets 331 cooperate with the side magnetic portion 34 to form a magnetic field region that is longer in the vertical direction and has a relatively uniform magnetic field distribution in the area corresponding to the voice coil 22, so that the magnetic lines of force passing through the voice coil 22 are more numerous and denser, and the driving force is greater, which can provide the voice coil 22 with a large and flat driving force that changes slowly with displacement, thereby realizing a superlinear BL(x) design and reducing the risk of distortion. At the same time, the magnetic structure formed by the two center magnets 331 further enhances the magnetic field strength in the area where the voice coil 22 is located, effectively increases the BL value, and improves the acoustic performance of the sound-generating device 100; further, the two center magnets 331 cancel the structure of the conventional center washer, which not only enables a thinning design, but also makes the magnetic lines of force more evenly distributed and the BL (x) curve flatter, thereby reducing distortion. Moreover, under the same volume requirements, since there is no center washer structure, the volume of the two center magnets 331 can be made larger, thereby improving the BL value of the product. The BL value of the sound-generating device 100 of the present invention can be increased by 35% compared to the conventional solution. Wherein, B represents the magnetic flux density generated by the magnet, L is the effective length of the voice coil 22, and x is the vibration displacement of the voice coil 22. As Figure 21 As shown, the abscissa of the BL(x) curve is the displacement x of the voice coil 22 , in mm, and the ordinate of the BL(x) curve is the BL value, in N / A.

[0082] In this embodiment, if Figures 3 to 10 As shown, the two central magnets 331 of the central magnetic portion 33 include a first central magnet 3311 and a second central magnet 3312. The first central magnet 3311 is located near the top of the voice coil 22, and the second central magnet 3312 is located near the bottom of the voice coil 22. It will be understood that the top of the voice coil 22 is the end where the voice coil 22 is connected to the first diaphragm 211, and the bottom of the voice coil 22 is the end where the voice coil 22 is connected to the second diaphragm 212. Optionally, the first central magnet 3311 is located within the first cavity 314, and the second central magnet 3312 is located within the second cavity 324.

[0083] Optionally, the projections of the two central magnets 331 along the first direction are located inside the voice coil 22. This prevents the voice coil 22 from rubbing against the first central magnet 3311 or the second central magnet 3312 when the voice coil 22 vibrates. The radially outer height space of the central magnetic portion 33 is utilized to accommodate the vibration displacement of the voice coil 22. This eliminates the need for additional height space between the first central magnet 3311 and the second central magnet 3312 to accommodate the vibration displacement of the voice coil 22, thereby facilitating a thinner design for the sound-generating device 100.

[0084] At the same time, by setting the central magnetic part 33 of the magnetic circuit system 3 as the first central magnet 3311 and the second central magnet 3312, and making the first central magnet 3311 and the second central magnet 3312 facing the vibration plate 213 side exposed to the first cavity 314 and the second cavity 324 of the sound-emitting device 100 respectively, the two central magnets 331 (that is, the first central magnet 3311 and the second central magnet 3312) are both magnetized along the first direction and the magnetization directions are opposite. Compared with the magnetic circuit structure of a conventional speaker, the central magnetic part 33 of the present invention eliminates the central washer (or central magnetic conductive plate) structure, thereby reducing the thickness of the sound-emitting device 100 in the Z direction. Moreover, the first central magnet 3311 and the second central magnet 3312 are opposite to each other along the first direction and have opposite magnetization directions, forming a counter-magnetic structure. The magnetic lines of force generated by the first central magnet 3311 and the second central magnet 3312 are repelled and transmitted to the outside of the voice coil 22, and cooperate with the side magnet portion 34 located on the outside of the voice coil 22 to form a magnetic field region that is longer in the vertical direction and has a relatively uniform magnetic field distribution. This makes the magnetic lines of force passing through the voice coil 22 more numerous and denser, and the driving force is greater. It can provide the voice coil 22 with a large and flat driving force that changes slowly with displacement, thereby realizing a super-linear BL(x) design and reducing the risk of distortion. Figure 20 and Figure 21 As shown; and, under the premise that the thickness of the sound-generating device 100 is certain, the central magnetic portion 33 of the present invention cancels the central washer (or central magnetic plate) structure, so that the first central magnet 3311 and the second central magnet 3312 can cooperate to effectively increase the volume of the central magnetic portion 33 and improve the BL value. Compared with the conventional solution, the BL value of the sound-generating device 100 of the present invention can be increased by 35%. Figure 21 shown.

[0085] Optionally, the voice coil 22 is an annular voice coil and extends along a first direction, that is, the voice coil 22 has a height along the first direction and a thickness along a second direction, the second direction is perpendicular to the first direction, and the height of the voice coil 22 is greater than the thickness of the voice coil 22.

[0086] It should be noted that the thickness of the voice coil 22 is the distance between the inner and outer walls of the annular voice coil. In this embodiment, the voice coil 22 has a greater height than thickness. During vibration, especially at relatively large amplitudes, it is less affected by magnetic field variations, resulting in a significantly flatter BL(x) curve. This significantly reduces distortion in the sound-generating device 100 and improves sound quality. The voice coil 22 in this embodiment is suitable for use in full-band speakers operating in the 20 Hz to 20 kHz frequency range.

[0087] Specifically, optionally, the ratio of the height dimension to the thickness dimension of the voice coil 22 ranges from 1.1:1 to 10:1, and the specific ratio can be 1.1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, etc., and the user can choose according to actual needs.

[0088] In this embodiment, if Figure 1 、 Figures 5 to 10 As shown, by arranging the side magnetic portion 34 between the first diaphragm 211 and the second diaphragm 212 and on the outside of the voice coil 22, the side magnetic portion 34 cooperates with the two center magnets 331 of the center magnetic portion 33 to form a magnetic gap 35 for accommodating the voice coil 22, thereby effectively ensuring the magnetic field strength within the magnetic gap 35.

[0089] It can be understood that the side magnetic portions 34 form magnetic circuits with the two central magnets 331 of the central magnetic portion 33, and the magnetic lines of force of the two magnetic circuits repel each other, so that the magnetic lines of force in the magnetic gap 35 are more evenly distributed and more magnetic lines of force pass through the voice coil 22, thereby increasing the magnetic force acting on the voice coil 22, effectively improving the BL value, making the magnetic line distribution more even, and the BL(x) curve flatter, thereby reducing distortion.

[0090] It should be noted that the side magnet portion 34 can be a unitary structure. For example, the side magnet portion 34 can be an integrally formed annular structure, that is, the side magnet portion 34 is arranged in an annular shape and surrounds the outside of the voice coil 22. Of course, the side magnet portion 34 can also be a split structure, in which case it includes multiple side magnet portions 34, which are connected end to end to form a closed annular structure and surround the outside of the voice coil 22; or, the side magnet portions 34 can be spaced apart and arranged around the voice coil 22, that is, there are gaps or gaps between adjacent side magnet portions 34, which are not limited here.

[0091] In one embodiment, if Figures 3 to 5 、 Figures 8 to 11As shown, the sound production device 100 comprises a vibration system 2 and a magnetic circuit system 3, the vibration system 2 comprises a diaphragm assembly 21 and a voice coil 22, the diaphragm assembly 21 comprises a first diaphragm 211, a second diaphragm 212 and a vibration plate 213, the first diaphragm 211 and the second diaphragm 212 vibrate along a first direction, and the first diaphragm 211 and the second diaphragm 212 are arranged at intervals along the first direction and are respectively connected to two ends of the voice coil 22 along the first direction, the vibration plate 213 is located at the inner side of the voice coil 22, and the outer periphery of the vibration plate 213 abuts against the inner peripheral wall of the voice coil 22, the magnetic circuit system 3 comprises a center magnetic part 33 and a side magnetic part 34, the side magnetic part 34 is arranged between the first diaphragm 211 and the second diaphragm 212 and is located at the outer side of the voice coil 22, the center magnetic part 33 comprises two center magnets 331 arranged at intervals and opposite along the first direction, the two center magnets 331 are located at both sides of the vibration plate 213 along the first direction, and the two center magnets 331 are magnetized along the first direction and the magnetization directions are opposite, the side magnetic part 34 cooperates with the center magnetic part 33 to form a magnetic gap 35 accommodating the voice coil 22; wherein the first diaphragm 211 and the second diaphragm 212 each comprise a deformation part 2116 and a first end 2114 and a second end 2115 arranged at both ends of the deformation part 2116 along the first direction, the two first ends 2114 are respectively connected to the two ends of the voice coil 22, and at least part of the two second ends 2115 are respectively connected to the side magnetic part 34, the sound production device 100 forms a first cavity 314 and a second cavity 324 located at both sides of the vibration plate 213 along the first direction, the two center magnets 331 exposed to the first cavity 314 and the second cavity 324 respectively on the side of the vibration plate 213, and the sound production device 100 further comprises a first sound hole 313 and a second sound hole 323 respectively communicating with the first cavity 314 and the second cavity 324.

[0092] It should be noted that the first end 2114 of the first diaphragm 211 and the first end 2114 of the second diaphragm 212 are directly connected to the two ends of the voice coil 22 along the first direction. Of course, the first end 2114 of the first diaphragm 211 and the first end 2114 of the second diaphragm 212 are indirectly connected to the two ends of the voice coil 22 along the first direction, for example, the first end 2114 of the first diaphragm 211 is connected to one end of the voice coil 22 through a support or framework, and the first end 2114 of the second diaphragm 212 is connected to the other end of the voice coil 22 through a support or framework, which is not limited here.

[0093] It can be understood that the sound-generating device 100 is configured by setting the diaphragm assembly 21 of the vibration system 2 to include a first diaphragm 211, a second diaphragm 212, and a vibration plate 213. The first diaphragm 211 and the second diaphragm 212 are spaced apart along the first direction and respectively connected to the two ends of the voice coil 22 along the first direction. The vibration plate 213 is disposed on the inner side of the voice coil 22 so that the outer periphery of the vibration plate 213 is disposed against the inner circumferential wall of the voice coil 22. In this way, a first cavity 314 and a second cavity 324 are formed on both sides of the vibration plate 213 along the first direction in the sound-generating device 100, and a first sound outlet 313 and a second sound outlet 323 are provided in the sound-generating device 100, which are connected to the first cavity 314 and the second cavity 324 respectively. In this way, the dual diaphragms are connected through a voice coil 22 to drive the vibration plate 213 to vibrate, thereby achieving consistency in the loudness of the sound waves in the two cavities, and the phases are completely opposite, so that both sides of the sound-emitting device 100 can directly emit sound, and the sound-emitting device 100 is placed in the glasses leg of the whole machine to form a "true" dipole up and down, reducing far-field leakage and ensuring privacy, and the first diaphragm 211 and the second diaphragm 212 are both set as a deformation part 2116 and a first end 2114 and a second end 2115 arranged at both ends of the deformation part 2116 along the first direction, so that the two first ends 2114 are respectively connected to the two ends of the voice coil 22 along the first direction, and at least parts of the two second ends 2115 are respectively connected to the edge magnetic part 34, that is, the first The first diaphragm 211 and the second diaphragm 212 are set as a vertical diaphragm structure, thereby increasing the effective vibration area and further improving the sound effect and acoustic performance of the sound-generating device 100; at the same time, by arranging the side magnetic part 34 of the magnetic circuit system 3 between the first diaphragm 211 and the second diaphragm 212 and located on the outside of the voice coil 22, and the two central magnets 331 of the central magnetic part 33 are arranged oppositely and spaced along the first direction, and are located on opposite sides of the vibration plate 213 along the first direction, so that the two central magnets 331 are magnetized along the first direction and in opposite directions, and the two central magnets 331 are exposed to the first cavity 314 and the second cavity 324 on the side facing the vibration plate 213, respectively. In this way, the two central magnets 331 are used to generate a plurality of magnetic fields. The formed counter-magnetic structure enhances the magnetic field strength in the area where the voice coil 22 is located, thereby enhancing the magnetic force acting on the voice coil 22. Moreover, the voice coil 22 is in the magnetic gap 35 formed by the cooperation of the side magnetic portion 34 and the center magnetic portion 33. Under the action of the counter-magnetic structure formed by the two center magnets 331 and the side magnetic portion 34, the magnetic force acting on the voice coil 22 is enhanced, and the magnetic lines of force are highly concentrated near the voice coil 22, thereby enhancing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, thereby improving the performance and improving the acoustic performance of the sound-emitting device 100. Furthermore, the two center magnets 331 eliminate the structure of the conventional center washer, which not only realizes a thinning design, but also makes the magnetic lines of force more evenly distributed and the BL(x) curve flatter, thereby reducing distortion.Moreover, under the same volume requirement, since there is no central washer structure, the volume of the two central magnets 331 can be made larger, thereby improving the BL value of the product.

[0094] In one embodiment, the deformation portion 2116 is provided with at least one bending portion along the first direction, and an opening of the bending portion faces a direction perpendicular to the first direction.

[0095] Understandably, Figures 3 to 6 、 Figure 11 As shown, the deformable portion 2116 can deform and expand along the first direction so that the voice coil 22 vibrates along the first direction within the magnetic gap 35. Optionally, the deformable portion 2116 has at least one bend along the first direction. Optionally, the deformable portion 2116 has multiple bends along the first direction, and the multiple bends are arranged and connected along the first direction, which is not limited here.

[0096] Of course, the first diaphragm 211 and the second diaphragm 212 can also be configured as horizontal diaphragms. In another embodiment, the first diaphragm 211 and the second diaphragm 212 each include an inner connecting portion 2111, a folded ring portion 2112 disposed around the inner connecting portion 2111, and an outer connecting portion 2113 disposed around the folded ring portion 2112. The two inner connecting portions 2111 are respectively connected to the two ends of the voice coil 22 along the first direction, and the two outer connecting portions 2113 are respectively connected to the housing 1 or the magnetic circuit system 3, which is not limited here.

[0097] In this embodiment, if Figure 7 As shown, the inner connecting portion 2111, the folding portion 2112 and the outer connecting portion 2113 of the first diaphragm 211 and the second diaphragm 212 are connected and arranged in a direction perpendicular to the first direction. It can be understood that the first diaphragm 211 and the second diaphragm 212 are connected to a structure such as a shell or a housing through the outer connecting portion 2113.

[0098] In one embodiment, if Figure 7 As shown, the sound-generating device 100 further includes a housing 1 , and two external connection portions 2113 are respectively connected to two ends of the housing 1 along a first direction.

[0099] It should be noted that the folding ring portions 2112 of the first diaphragm 211 and the second diaphragm 212 can be convex structures that bulge upward or concave structures that sink downward. Optionally, both folding ring portions 2112 bulge toward the edge magnetic portion 34, which is not limited here.

[0100] It can be understood that when the first diaphragm 211 and the second diaphragm 212 are vertical diaphragms, in order to achieve the sealing performance of the first cavity 314 and the second cavity 324, the edge magnet portion 34 can be selected as an integrated structure. For example, the edge magnet portion 34 can be selected as an integrated annular structure, that is, the edge magnet portion 34 is arranged in a ring shape and is arranged around the outside of the voice coil 22, or the edge magnet portion 34 includes multiple edge magnet portions 34, and the multiple edge magnet portions 34 are connected end to end to form a closed annular structure, and are arranged around the outside of the voice coil 22, so that the second end 2115 of the first diaphragm 211 and the second end 2115 of the second diaphragm 212 are respectively connected to the two sides of the edge magnet portion 34 that are opposite to each other along the first direction.

[0101] Of course, multiple edge magnets 34 can be provided, and the multiple edge magnets 34 are spaced apart and arranged around the voice coil 22, that is, there are gaps or indentations between adjacent edge magnets 34. In order to achieve sealing of the first cavity 314 and the second cavity 324, in one embodiment, the sound-generating device 100 further includes a housing 1, which is provided with support portions corresponding to the gaps or indentations between adjacent edge magnets 34, such that the second end 2115 of the first diaphragm 211 and the second end 2115 of the second diaphragm 212 are connected to the edge magnets 34 and the support portions of the housing 1, respectively. This is not limited here.

[0102] In one embodiment, the voice coil 22 includes two long sides 221 and two short sides 222 connected end to end, and includes two side magnets 34. The two side magnets 34 are symmetrically arranged on opposite sides of the voice coil 22 and extend respectively along the extension direction of the long sides 221; the sound-emitting device 100 also includes a shell 1, and the shell 1 has a support portion protruding from each short side 222, and the two ends of each support portion extend toward the two side magnets 34 respectively, and are surrounded by the two side magnets 34 to form a ring, and each second end 2115 is connected to the two side magnets 34 and the two support portions.

[0103] In this embodiment, if Figure 3 、 Figures 5 to 10 As shown, the side magnet parts 34 include two, and the two side magnet parts 34 are symmetrically arranged on opposite sides of the voice coil 22, and extend respectively along the extension direction of the long side 221, that is, no side magnet parts 34 are arranged in the direction of the two short sides 222 of the voice coil 22. At this time, in order to achieve the sealing of the first cavity 314 and the second cavity 324, a support part is arranged inside the outer shell 1, so that the support part is arranged corresponding to each short side 222, and the two ends of each support part extend toward the two side magnet parts 34 respectively and are connected to the two side magnet parts 34, and each second end 2115 is connected to the two side magnet parts 34 and the two support parts.

[0104] In order to ensure that the deformation parts 2116 of the first diaphragm 211 and the second diaphragm 212 have vibration space in the direction perpendicular to the first direction, in this embodiment, along the direction perpendicular to the first direction, there is a third vibration gap between the shell 1 and the two deformation parts 2116 respectively, and the two third vibration gaps are respectively connected to the first cavity 314 and the second cavity 324.

[0105] As will be appreciated, the housing 1, the edge magnet 34, the first diaphragm 211, the voice coil 22, and the second diaphragm 212 cooperate to form the third cavity 13. To ensure pressure balance between the first and second diaphragms 211, 212, the sound-generating device 100 is provided with an air vent 14 communicating with the third cavity 13, although this is not specifically defined herein.

[0106] In one embodiment, if Figure 4 、 Figure 5 and Figure 7 As shown, the housing 1 includes a first shell 11 and a second shell 12 arranged along a first direction. The first shell 11 and the second shell 12 are respectively connected to the two sides of the edge magnetic portion 34 along the first direction. In this case, the first shell 11 corresponds to the first diaphragm 211 and is located outside the first diaphragm 211. The second shell 12 corresponds to the second diaphragm 212 and is located outside the second diaphragm 212.

[0107] Understandably, Figure 5 As shown, a third vibration gap is defined between the first housing 11 and the deformed portion 2116 of the first diaphragm 211, and the third vibration gap is communicated with the first cavity 314. A third vibration gap is defined between the second housing 12 and the deformed portion 2116 of the second diaphragm 212, and the third vibration gap is communicated with the second cavity 324. Optionally, the first housing 11 and / or the second housing 12 are provided with an air vent 14.

[0108] In one embodiment, the distances between the two sides of the vibration plate 213 along the first direction and the corresponding central magnet 331 are the same.

[0109] In this embodiment, if Figures 4 to 10As shown, along the first direction, the diaphragm 213 has a first surface facing the first central magnet 3311 and a second surface facing the second central magnet 3312. Optionally, the distance from the first surface to the first central magnet 3311 is the same as the distance from the second surface to the second central magnet 3312. This ensures that when the voice coil 22 drives the diaphragm 213 to vibrate along the first direction, collision and interference between the diaphragm 213 and the first and second central magnets 3311, 3312 are effectively avoided. Optionally, the projection of the diaphragm 213 perpendicular to the first direction is located in the middle of the voice coil 22, that is, the projection of the diaphragm 213 along the second direction is located in the middle of the voice coil 22. This makes the magnetic field lines in the voice coil 22 more uniform, and the magnetic circuit system 3 can provide the voice coil 22 with a large, flat driving force that varies slowly with displacement, thereby achieving a superlinear BL(x) design and reducing the risk of distortion. Optionally, the diaphragm 213 corresponds to the middle position of the voice coil 22 along the first direction.

[0110] Optionally, the thickness of the vibration plate 213 along the first direction is less than the extension length of the voice coil 22 along the first direction. This ensures that the vibration plate 213 and the voice coil 22 cooperate to provide space for the two central magnets 331 during the vibration of the voice coil 22, while also ensuring the structural strength of the vibration plate 213 and the sealing performance of the first cavity 314 and the second cavity 324.

[0111] To further ensure that the voice coil 22 vibrates within the magnetic gap 35, driving the first diaphragm 211 and the second diaphragm 212 to radiate sound waves of equal magnitude and opposite phases to the first cavity 314 and the second cavity 324, respectively, the two center magnets 331 can optionally have the same magnetic energy product. This ensures that the magnetic field strength of the first center magnet 3311 is the same as the magnetic field strength of the second center magnet 3312, thereby ensuring that the magnetic field driving force acting on the voice coil 22 is the same.

[0112] To ensure that the sound waves emitted by the first cavity 314 and the second cavity 324 have the same loudness and the magnetic field of the magnetic gap 35 is uniform, the two center magnets 331 are optionally arranged symmetrically relative to the vibration plate 213. This arrangement ensures that the driving force on both ends of the voice coil 22 is the same.

[0113] In this embodiment, the two center magnets 331 have identical outer profiles, and the thickness ratio of the two center magnets 331 along the first direction can be selected from 0.5 to 2. Alternatively, the thickness ratio of the two center magnets 331 along the first direction can be selected from 0.5, 1, 1.5, 2, and so on, without limitation. This arrangement ensures that the two center magnets 331 of the center magnetic portion 33 form a magnetic circuit with the side magnetic portions 34, thereby ensuring a high density of magnetic flux lines within the magnetic gap 35 that passes through the voice coil 22.

[0114] To further ensure the loudness consistency of the sound waves emitted by the first cavity 314 and the second cavity 324, optionally, the first diaphragm 211 and the second diaphragm 212 are symmetrically arranged relative to the vibrating plate 213.

[0115] It can be understood that, to ensure that the central magnetic part 33 and the edge magnetic part 34 cooperate to generate a driving force on the voice coil 22, optionally, the thickness of the edge magnetic part 34 along the first direction is greater than the extension length of the voice coil 22 along the first direction; on the other hand, in order to thin the thickness of the sound generating device 100 and further reduce the occupied space of the whole machine, the thickness of the edge magnetic part 34 along the first direction is not greater than 3 times the extension length of the voice coil 22 along the first direction.

[0116] In an embodiment, the voice coil 22 is projected along a direction perpendicular to the first direction to a surface of the side of the edge magnetic part 34 facing the voice coil 22. Optionally, the voice coil 22 is projected along a direction perpendicular to the first direction to between the two center magnets 331.

[0117] In the present embodiment, when the sound generating device 100 is not working, i.e. the voice coil 22 is not vibrating, the voice coil 22 is projected along a direction perpendicular to the first direction (i.e. the second direction) to a surface of the side of the edge magnetic part 34 facing the voice coil 22, and the voice coil 22 is projected along a direction perpendicular to the first direction (i.e. the second direction) to between the two center magnets 331, so as to ensure that the voice coil 22 can reciprocate close to the first center magnet 3311 or the second center magnet 3312 during vibration, thereby ensuring that the magnetic force acting on the voice coil 22 when moving does not change or changes very little, and making the magnetic flux distribution of the magnetic circuit system 3 more uniform and the BL(x) curve more flat, thereby reducing distortion.

[0118] It should be noted that, in the case of small amplitude of the voice coil 22, the voice coil 22 is projected along a direction perpendicular to the first direction to a surface of the side of the edge magnetic part 34 facing the voice coil 22, and the voice coil 22 is projected along a direction perpendicular to the first direction to between the two center magnets 331. However, in the case of large amplitude of the voice coil 22, only when the voice coil 22 is not vibrating, the voice coil 22 is projected along a direction perpendicular to the first direction to a surface of the side of the edge magnetic part 34 facing the voice coil 22, and the voice coil 22 is projected along a direction perpendicular to the first direction to between the two center magnets 331, which is not limited herein.

[0119] In an embodiment, as shown in Figures 3 to 13 The voice coil 22 can also be provided as an integrally formed structure, i.e. the voice coil 22 is integrally wound and formed, and extends along the first direction, so that the voice coil 22 is accommodated in the magnetic gap 35, thereby simplifying the structural design of the sound generating device 100 and improving assembly efficiency.

[0120] Of course, in other embodiments, the voice coil 22 can also be provided as a split structure, as shown in Figure 14As shown, the voice coil 22 includes a first sub-voice coil 223 and a second sub-voice coil 224 arranged at opposite sides of the vibrating plate 213, and the first diaphragm 211 and the second diaphragm 212 are respectively connected to one ends of the first sub-voice coil 223 and the second sub-voice coil 224 away from the first direction. No limitation is made herein.

[0121] In order to further improve the connection stability of the vibrating plate 213, in an embodiment, as shown in Figure 13 the vibrating plate 213 is bent and extended at a periphery thereof towards an inner side surface of the voice coil 22 to form an extension 2131 connected to the inner side surface of the voice coil 22. It can be understood that, by bending and extending the periphery of the vibrating plate 213 to form the extension 2131, the connection area with the voice coil 22 is increased by the extension 2131, thereby improving the connection strength and stability.

[0122] In order to further improve the driving force on the voice coil 22 and improve the performance of the sound generating device 100, in an embodiment, the vibrating plate 213 has a magnetic conductive property. In this way, when the voice coil 22 vibrates, the vibrating plate 213 can be attracted to each other by the two center magnets 331 of the center magnetic part 33, thereby increasing the driving force on the voice coil 22, and thus improving the performance of the sound generating device 100.

[0123] It can be understood that the vibrating plate 213 having a magnetic conductive property can be made of a magnetic conductive material or made of a material containing a magnetic conductive material. Of course, a magnetic conductive layer 2132 and a magnetic conductive part 2133 and the like can also be arranged on the vibrating plate 213, which is not limited herein.

[0124] In an embodiment, as shown in Figure 16 and Figure 17 at least one surface of the vibrating plate 213 is coated with a magnetic conductive layer 2132. It can be understood that the surface of the vibrating plate 213 facing the first center magnet 3311 and / or the second center magnet 3312 is coated with the magnetic conductive layer 2132. Alternatively, the magnetic conductive layer 2132 is a magnetic conductive coating coated on the vibrating plate 213.

[0125] Alternatively, the sum of the thickness of the vibrating plate 213 along the first direction and the thickness of the magnetic conductive layer 2132 along the first direction is less than the extension length of the voice coil 22 along the first direction. It can be understood that, in order to avoid the thickness of the magnetic conductive layer 2132 being too thick, which causes the vibrating plate 213 to have too large a weight and affects the vibration quality of the vibration system 2, alternatively, the thickness of the magnetic conductive layer 2132 along the first direction is not greater than 5 times the thickness of the vibrating plate 213 along the first direction.

[0126] In an embodiment, as shown in Figure 18 and Figure 19As shown, the vibration plate 213 is provided with a magnetic conductive member 2133. It is understood that the magnetic conductive member 2133 can be a metal magnetic conductive member, embedded in the interior of the vibration plate 213; or embedded on the surface of the vibration plate 213; or, the vibration plate 213 is provided with a through hole, and the magnetic conductive member 2133 is embedded in the through hole, which is not limited here.

[0127] Optionally, the vibration plate 213 and the magnetic conductive member 2133 are an integrally formed structure; or, the vibration plate 213 and the magnetic conductive member 2133 are bonded or welded together, etc., which is not limited here.

[0128] To ensure the connection between the first and second diaphragms 211, 212 and the voice coil 22, a space is formed between the first and second diaphragms 211, 212 for mounting the edge magnet 34 to ensure that the vibrations of the first and second diaphragms 211, 212 do not interfere with the edge magnet 34. In one embodiment, the vibration system 2 further includes a skeleton structure, which is connected to the voice coil 22 and extends along a first direction to support and connect the first and second diaphragms 211, 212 and keep them away from the voice coil 22. It is understood that the skeleton structure can be an integral structure or a split structure, which is not limited here.

[0129] In one embodiment, the vibration system 2 further includes a bracket 24, which is disposed on the inner side of the voice coil 22, extends along the first direction and protrudes from both ends of the voice coil 22 along the first direction, the two first ends 2114 are respectively connected to the two ends of the bracket 24 along the first direction, and the outer periphery of the vibration plate 213 is connected to the bracket 24.

[0130] In this embodiment, if Figure 12 As shown, by providing the skeleton structure as an integrally formed bracket 24, and positioning the bracket 24 inside the voice coil 22, extending in the first direction and protruding beyond both ends of the voice coil 22 along the first direction, the first end 2114 of the first diaphragm 211 and the first end 2114 of the second diaphragm 212 are respectively connected to both ends of the bracket 24 along the first direction. This facilitates connecting the first diaphragm 211 and the second diaphragm 212 to both ends of the bracket 24 along the first direction, thus simplifying assembly steps. It will be appreciated that the outer periphery of the vibration plate 213 is connected to the bracket 24. This not only allows the vibration plate 213 and the bracket 24 to fit within the space on opposite sides of the vibration plate 213 for accommodating the two center magnets 331, but also improves sealing.

[0131] It can be understood that the bracket 24 and the vibration plate 213 are provided separately. Optionally, the bracket 24 and the vibration plate 213 are bonded or welded, which is not limited here.

[0132] In order to further improve the connection stability between the bracket 24 and the first diaphragm 211 and the second diaphragm 212, in one embodiment, the bracket 24 is bent and extended at both ends along the first direction to form an edge portion 241, and the edge portion 241 is connected to the first diaphragm 211 or the second diaphragm 212, that is, each edge portion 241 is connected to a first end 2114.

[0133] Understandably, Figure 12 As shown, at least one end of the bracket 24 is bent and extended toward the first diaphragm 211 or the second diaphragm 212 to form an edge portion 241, so that the first diaphragm 211 or the second diaphragm 212 is supported and connected to the edge portion 241, thereby increasing the connection area and improving the connection stability.

[0134] Optionally, the projection of the deformed portion 2116 along the first direction at least partially overlaps with the edge portion 241. This arrangement ensures that the edge portion 241 of the bracket 24 is connected to the first and second diaphragms 211 and 212, while ensuring that the bracket 24 does not affect the vibration of the deformed portion 2116.

[0135] In this embodiment, along a direction perpendicular to the first direction, a second vibration gap is formed between the bracket 24 and each of the two deformation portions 2116. It can be understood that such a configuration can utilize the second vibration gap to provide vibration space for the deformation portion 2116.

[0136] In one embodiment, the vibration system 2 further includes a first skeleton 231 and a second skeleton 232, wherein the two ends of the first skeleton 231 along the first direction are respectively connected to a first end 2114 and one end of the voice coil 22, and the two ends of the second skeleton 232 along the first direction are respectively connected to the other first end 2114 and the other end of the voice coil 22.

[0137] In this embodiment, if Figures 3 to 11 As shown, by setting the skeleton structure as a split structure, the skeleton structure includes a first skeleton 231 and a second skeleton 232, and the first skeleton 231 and the second skeleton 232 are respectively arranged at the two ends of the voice coil 22 along the first direction, that is, the two ends of the first skeleton 231 along the first direction are respectively connected to the first diaphragm 211 and one end of the voice coil 22, and the two ends of the second skeleton 232 along the first direction are respectively connected to the second diaphragm 212 and the other end of the voice coil 22, so that the first skeleton 231 and the second skeleton 232 do not occupy the space of the magnetic gap 35, which is beneficial to reducing the width of the magnetic gap 35, and the first skeleton 231 and the second skeleton 232 are used to fix the first diaphragm 211 and the second diaphragm 212, so that the first diaphragm 211 and the second diaphragm 212 are spaced along the first direction, and a space for installing the edge magnetic part 34 is formed.

[0138] In order to increase the connection stability between the first skeleton 231 / the second skeleton 232 and the first diaphragm 211 / the second diaphragm 212, in one embodiment, as shown in FIG. Figures 3 to 11 As shown, one end of the first skeleton 231 and / or the second skeleton 232 adjacent to the first end 2114 is bent and extended toward the first end 2114 to form a first bending portion 233 , and the first bending portion 233 is connected to the first end 2114 .

[0139] It is understood that the first bend portion 233 of the first skeleton 231 and / or the second skeleton 232 is connected to the first diaphragm 211 / the second diaphragm 212 respectively, thereby increasing the connection area and improving the connection stability. Optionally, the projection of the deformation portion 2116 along the first direction at least partially overlaps with the first bend portion 233. This ensures that the first bend portion 233 of the first skeleton 231 / the second skeleton 232 is connected to the first diaphragm 211 / the second diaphragm 212, and also ensures that the first skeleton 231 / the second skeleton 232 does not affect the vibration of the deformation portion 2116.

[0140] In order to increase the connection stability between the first frame 231 / the second frame 232 and the voice coil 22, in one embodiment, as shown in FIG. Figures 3 to 11 As shown, one end of the first frame 231 and / or the second frame 232 adjacent to the voice coil 22 is bent and extended to form a second bent portion 234, which is connected to the end of the voice coil 22. It will be appreciated that utilizing the second bent portion 234 of the first frame 231 and / or the second frame 232 to connect to the end of the voice coil 22 increases the connection area and improves connection stability.

[0141] Of course, in other embodiments, the first frame 231 and / or the second frame 232, adjacent to the voice coil 22, extends along the inner surface of the voice coil 22 and is connected to the inner surface of the voice coil 22. It is understood that the first frame 231 and / or the second frame 232 may extend along the inner surface of the voice coil 22 until they are connected to or abut the vibration plate 213, and this is not limited here.

[0142] Optionally, along a direction perpendicular to the first direction, a first vibration gap is defined between the first frame 231 and the second frame 232 and the two deformation parts 2116. It is understood that such a configuration can utilize the first vibration gap to provide a vibration space for the deformation part 2116.

[0143] In one embodiment, the first diaphragm 211 and the vibration plate 213 radiate a first sound wave toward the first cavity 314 , and the second diaphragm 212 and the vibration plate 213 radiate a second sound wave toward the second cavity 324 . The first sound wave and the second sound wave have opposite phases.

[0144] In this embodiment, the first cavity 314 and the second cavity 324 are located on both sides of the vibration plate 213 along the first direction. Figure 4 、 Figure 5 、 Figure 7 As shown, the magnetic circuit system 3 also includes a first magnetic yoke 31 and a second magnetic yoke 32 arranged opposite to each other, so that a first cavity 314 is formed between the first diaphragm 211, the first skeleton 231 or the bracket 24, the vibration plate 213 and the first magnetic yoke 31 of the magnetic circuit system 3, and a second cavity 324 is formed between the second diaphragm 212, the second skeleton 232 or the bracket 24, the vibration plate 213 and the second magnetic yoke 32 of the magnetic circuit system 3, and a third cavity 13 is formed between the first diaphragm 211, the first skeleton 231 or the bracket 24, the voice coil 22 and the outer shell 1.

[0145] It can be understood that the sound-emitting device 100 is provided with a first sound hole 313 connected to the first cavity 314 , and the sound-emitting device 100 is provided with a second sound hole 323 connected to the second cavity 324 , so that the sound-emitting device 100 emits sound outward through the first sound hole 313 and the second sound hole 323 .

[0146] In order to balance the air pressure of the first cavity 314 , the second cavity 324 and the third cavity 13 , the sound-generating device 100 is further provided with an air vent 14 communicating with the third cavity 13 , so that the third cavity 13 of the sound-generating device 100 can be easily vented through the air vent 14 .

[0147] It can be understood that the voice coil 22 drives the first diaphragm 211 and the vibration plate 213 to radiate the first sound wave to the first cavity 314, and the voice coil 22 drives the second diaphragm 212 and the vibration plate 213 to radiate the second sound wave to the second cavity 324, so that the phases of the first sound wave and the second sound wave are opposite. In this way, the first sound wave of the first cavity 314 of the sound-emitting device 100 is radiated outward through the first sound outlet 313, and the second sound wave of the second cavity 324 is radiated outward through the second sound outlet 323. From a fixed position at a longer distance in the environment, since the positions of the two sound waves are relatively close, it can be considered that the distances of the fixed positions relative to the two sound waves are approximately the same, so that the two sound waves will produce two equal and opposite sound fields. Therefore, the fixed position will receive two equal and opposite phase sound waves. According to the superposition effect of dipoles, the sound waves at the fixed position can be offset to the greatest extent, which greatly improves the sound leakage problem of the sound-emitting device 100 during use, protects the user's privacy, and improves the user experience.

[0148] In one embodiment, the edge magnet portion 34 includes two edge magnets 341 stacked along a first direction and a edge magnetic conductive plate 342 arranged between the two edge magnets 341, and the two second ends 2115 are respectively connected to the side of the two edge magnets 341 facing away from the edge magnetic conductive plate 342; wherein, the two edge magnets 341 are magnetized along the first direction and the magnetization directions are opposite, and the magnetic poles at one end of the two edge magnets 341 away from each other are opposite in polarity to the magnetic poles at one end of the two center magnets 331 away from each other.

[0149] In this embodiment, if Figure 1 、 Figure 3 、 Figures 5 to 7 As shown, by setting the side magnetic portion 34 to two side magnets 341 stacked along the first direction and a side magnetic conductive plate 342 provided between the two side magnets 341, the two side magnets 341 respectively form a magnetic circuit with the two center magnets 331, and the side magnetic conductive plate 342 between the two side magnets 341 is used to gather and guide the magnetic flux lines of the two magnetic circuits through the voice coil 22 located in the magnetic gap 35, thereby increasing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and further improving the performance, thereby improving the acoustic performance of the sound-generating device 100.

[0150] Optionally, the two side magnets 341 and the side magnetic conductive plates 342 of the side magnetic portion 34 have similar structural profiles. That is, when the side magnetic portion 34 is a one-piece ring structure, the two side magnets 341 and the side magnetic conductive plates 342 are both one-piece ring structures. Alternatively, when the side magnetic portion 34 is a split structure, the two side magnets 341 and the side magnetic conductive plates 342 are both split structures and correspond one to one. Of course, in other embodiments, the structures of the two side magnets 341 and the side magnetic conductive plates 342 of the side magnetic portion 34 can also be different, for example, one of the two side magnets 341 and the side magnetic conductive plates 342 is a one-piece ring structure, and the other is a split structure. This is not limited here.

[0151] In one embodiment, a projection of the side magnetic conductive plate 342 along a direction perpendicular to the first direction is located within an extension length of the voice coil 22 along the first direction.

[0152] In this embodiment, when the sound-emitting device 100 is in an assembled state, that is, when the voice coil 22 is not vibrating, the side magnetic conductive plate 342 is located between the top of the voice coil 22 and the bottom of the voice coil 22 along the projection perpendicular to the first direction. In this way, more magnetic lines of force are guided through the voice coil 22, making the magnetic lines of force of the magnetic field in which the voice coil 22 is located more uniform, thereby ensuring that the magnetic force acting on the voice coil 22 remains unchanged or changes very little when it vibrates, and making the magnetic lines of force of the magnetic circuit system 3 more evenly distributed and the BL(x) curve flatter, thereby reducing distortion.

[0153] Optionally, the thickness of the edge magnetic plate 342 along the first direction is less than the extension length of the voice coil 22 along the first direction, but not less than 1 / 5 of the extension length of the voice coil 22 along the first direction. This configuration ensures that the magnetic flux lines gathered by the edge magnetic plate 342 pass through the voice coil 22 within the magnetic gap 35, thereby increasing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and thus improving performance and the acoustic performance of the sound-generating device 100.

[0154] In one embodiment, a projection of the side magnetic conductive plate 342 along a direction perpendicular to the first direction is located between the surface of the first central magnet 3311 and the surface of the second central magnet 3312 facing the diaphragm assembly 21 .

[0155] In this embodiment, if Figures 5 to 7 、 Figure 9 As shown, by arranging the side magnetic conductive plate 342 of the side magnetic portion 34 between the surfaces of the first center magnet 3311 and the second center magnet 3312 facing the diaphragm assembly 21 along the projection perpendicular to the first direction, it can be ensured that the side magnetic portion 34 can form a magnetic circuit with the first center magnet 3311 and the second center magnet 3312 respectively, so that more magnetic lines of force pass through the voice coil 22, thereby increasing the magnetic field strength, effectively improving the BL value, making the magnetic lines of force more evenly distributed, and the BL(x) curve flatter, thereby reducing distortion.

[0156] In another embodiment, the edge magnet portion 34 includes a side magnet 341 disposed between the first diaphragm 211 and the second diaphragm 212 , the side magnet 341 is located on the outside of the voice coil 22 , and the surfaces of the side magnet 341 facing the first diaphragm 211 and the second diaphragm 212 are exposed in the third cavity 13 .

[0157] In this embodiment, if Figure 8 As shown, by configuring the side magnet portion 34 as a single side magnet 341, that is, by having only one side magnet 341 along the first direction, the side magnets 341 form a magnetic circuit with the two center magnets 331, and the magnetic flux lines are concentrated and guided through the voice coil 22 within the magnetic gap 35. This increases the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, thereby improving the acoustic performance of the sound-generating device 100. At the same time, the side washers of the side magnet portion 34 are eliminated, thereby reducing the thickness of the sound-generating device 100 in the Z direction.

[0158] Optionally, the side magnets 341 are magnetized in a direction perpendicular to the first direction, and the polarity of the magnetic poles of the side magnets 341 facing the voice coil 22 is the same as the polarity of the magnetic poles at the ends of the two center magnets 331 that are away from each other. It will be appreciated that the magnetization direction of the side magnets 341 is perpendicular to the magnetization direction of the center magnets 331.

[0159] As will be appreciated, to further guide the magnetic flux lines of the magnetic circuit through the voice coil 22 within the magnetic gap 35, a side magnetic conductive plate 342 is provided on the side of the side magnet 341 facing the voice coil 22. In this embodiment, the thickness of the side magnetic conductive plate 342 along the first direction is no greater than the thickness of the side magnet 341 along the first direction. Optionally, the length of the side magnetic conductive plate 342 along the direction perpendicular to the first direction is no greater than half the length of the side magnet 341 along the direction perpendicular to the first direction.

[0160] In this embodiment, the thickness of the side magnets 341 along the first direction is less than the extension length of the voice coil 22 along the first direction, and is not less than 1 / 5 of the extension length of the voice coil 22 along the first direction. Optionally, the thickness of the side magnets 341 along the first direction is less than the thickness of the center magnets 331 along the first direction, and is not less than 1 / 5 of the thickness of the center magnets 331 along the first direction. This configuration ensures that the side magnets 341 and the two center magnets 331 form a magnetic circuit, and guides the magnetic flux lines to pass through the voice coil 22 within the magnetic gap 35, thereby increasing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and thereby improving performance and the acoustic performance of the sound-generating device 100, which is not limited here.

[0161] In another embodiment, the side magnetic portion 34 includes a side magnetic conductive plate 342 arranged between the first diaphragm 211 and the second diaphragm 212. The side magnetic conductive plate 342 is located on the outside of the voice coil 22, and the surfaces of the side magnetic conductive plate 342 facing the first diaphragm 211 and the second diaphragm 212 are exposed in the third cavity 13.

[0162] In this embodiment, if Figure 9 As shown, by providing the side magnet portion 34 with a side magnetic conductive plate 342, that is, there is only one side magnetic conductive plate 342 along the first direction, the side magnetic conductive plates 342 are used to gather and guide the magnetic flux lines forming the magnetic circuit of the two central magnets 331 through the voice coil 22 located in the magnetic gap 35, thereby increasing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and thus improving the performance and acoustic performance of the sound-generating device 100. At the same time, the thickness of the sound-generating device 100 in the Z direction is reduced.

[0163] Optionally, the thickness of the side magnetic conductive plate 342 along the first direction is less than the length of the voice coil 22 along the first direction, and is not less than 1 / 10 of the length of the voice coil 22 along the first direction. Optionally, the thickness of the side magnetic conductive plate 342 along the first direction is less than the thickness of the center magnet 331 along the first direction, and is not less than 1 / 10 of the thickness of the center magnet 331 along the first direction.

[0164] In yet another embodiment, the side magnet portions 34 form a Halbach magnetic circuit, which has a magnetic field-enhancing side facing the voice coil 22 and a magnetic field-weakening side facing away from the voice coil 22. As will be appreciated, by configuring the side magnet portions 34 as Halbach magnetic circuits, the Halbach magnetic circuits further enhance the magnetic field strength of the magnetic circuit formed with the two center magnets 331. This increases the density of magnetic flux lines passing through the voice coil 22 within the magnetic gap 35, thereby enhancing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and thereby improving performance and the acoustic performance of the sound-generating device 100.

[0165] In this embodiment, if Figure 10As shown, the Halbach magnetic circuit includes a first side magnet 343, a second side magnet 344 and a third side magnet 345 stacked along a first direction. The first side magnet 343 and the third side magnet 345 are magnetized along the first direction in opposite directions. The second side magnet 344 is magnetized in a direction perpendicular to the first direction. The polarity of the magnetic pole of the second side magnet 344 facing the voice coil 22 is the same as the polarity of the magnetic pole at one end of the two center magnets 331 away from each other. The polarity of the magnetic pole at one end of the two center magnets 331 away from each other is opposite to the polarity of the magnetic pole at one end of the first side magnet 343 and the third side magnet 345 away from each other.

[0166] It can be understood that the first side magnet 343 and the first center magnet 3311 form a magnetic circuit, and the third side magnet 345 and the second center magnet 3312 form a magnetic circuit, so that the magnetic flux lines of the two magnetic circuits are gathered to the second side magnet 344, and are further enhanced by the second side magnet 344 and pass through the voice coil 22 in the magnetic gap 35. This further increases the density of the magnetic flux lines, increases the magnetic field driving force acting on the voice coil 22, effectively increases the BL value, and thus improves the performance and the acoustic performance of the sound-emitting device 100.

[0167] In one embodiment, the magnetic circuit system 3 also includes a first magnetic yoke 31 and a second magnetic yoke 32 arranged opposite to each other, and the two center magnets 331 include a first center magnet 3311 and a second center magnet 3312. The side of the first center magnet 3311 facing away from the vibration plate 213 is connected to the first magnetic yoke 31, and the side of the second center magnet 3312 facing away from the vibration plate 213 is connected to the second magnetic yoke 32; wherein, a first cavity 314 is formed between the first diaphragm 211, the voice coil 22, the vibration plate 213 and the first magnetic yoke 31, and a second cavity 324 is formed between the second diaphragm 212, the voice coil 22, the vibration plate 213 and the second magnetic yoke 32, and the first magnetic yoke 31 and the second magnetic yoke 32 are respectively provided with a first sound outlet 313 and a second sound outlet 323.

[0168] In this embodiment, if Figure 1 、 Figures 3 to 5 、 Figure 7 As shown, by arranging the first magnetic yoke 31 and the second magnetic yoke 32, the first magnetic yoke 31 and the second magnetic yoke 32 are arranged relative to each other, so that the first magnetic yoke 31 and the second magnetic yoke 32 can be used to respectively install and fix the two center magnets 331, and at the same time, the magnetic lines of force of the two center magnets 331 are gathered to form a magnetic circuit.

[0169] As will be understood, the side of the first central magnet 3311 facing away from the vibration plate 213 is connected to the first magnetic yoke 31, and the side of the second central magnet 3312 facing away from the vibration plate 213 is connected to the second magnetic yoke 32. Optionally, the projected area of ​​the first magnetic yoke 31 along the first direction is greater than or equal to the projected area of ​​the first central magnet 3311 along the first direction, and the projected area of ​​the second magnetic yoke 32 along the first direction is greater than or equal to the projected area of ​​the second central magnet 3312 along the first direction. This not only ensures the installation and fixation of the first central magnet 3311 and the second central magnet 3312, but also provides a magnetic focusing effect.

[0170] In this embodiment, if Figures 4 to 11 As shown, a first cavity 314 is formed between the first diaphragm 211, the voice coil 22, the vibration plate 213, and the first magnetic yoke 31, and a second cavity 324 is formed between the second diaphragm 212, the voice coil 22, the vibration plate 213, and the second magnetic yoke 32, so that the first central magnet 3311 is located in the first cavity 314, and the second central magnet 3312 is located in the second cavity 324. It can be understood that the first magnetic yoke 31 is provided with a first sound outlet 313 connected to the first cavity 314, and the second magnetic yoke 32 is provided with a second sound outlet 323 connected to the second cavity 324, thereby achieving double-sided sound emission of the sound-emitting device 100.

[0171] To improve the sound effect, ensure smooth airflow within the first cavity 314 and the second cavity 324, and reduce weight, the first magnetic yoke 31 is provided with a plurality of first sound holes 313, which are spaced apart. The second magnetic yoke 32 is provided with a plurality of second sound holes 323, which are spaced apart, and the second sound holes 323 are spaced apart.

[0172] In one embodiment, the first magnetic yoke 31 is provided with a first recessed groove corresponding to the first central magnet 3311, and the first central magnet 3311 is disposed within the first recessed groove. As will be appreciated, this arrangement utilizes the first recessed groove to position the first central magnet 3311, improving installation stability. Furthermore, it reduces the assembly height between the first central magnet 3311 and the first magnetic yoke 31, increasing the vibration space of the vibration plate 213.

[0173] In this embodiment, the first recessed groove may be formed by a recess on the side of the first magnetic yoke 31 facing the first center magnet 3311, in which case the first magnetic yoke 31 is flat and faces away from the first center magnet 3311; or, the first recessed groove may be formed by bending the first magnetic yoke 31 toward the side away from the first center magnet 3311, in which case the side of the first magnetic yoke 31 facing away from the first center magnet 3311 is raised at the position corresponding to the first recessed groove, which is not limited here.

[0174] In one embodiment, the second magnetic yoke 32 is provided with a second recessed groove corresponding to the second central magnet 3312, and the second central magnet 3312 is disposed within the second recessed groove. As will be appreciated, this arrangement allows the second central magnet 3312 to be positioned and installed using the second recessed groove, improving installation stability. Furthermore, the assembly height between the second central magnet 3312 and the second magnetic yoke 32 can be reduced, thereby increasing the vibration space of the vibration plate 213.

[0175] In this embodiment, the second recessed groove can be formed by being recessed on the side of the second magnetic yoke 32 facing the second center magnet 3312, in which case the second magnetic yoke 32 is flat and facing away from the second center magnet 3312; or, the second recessed groove can be formed by being bent on the side of the second magnetic yoke 32 away from the second center magnet 3312, in which case the side of the second magnetic yoke 32 facing away from the second center magnet 3312 is raised at the position corresponding to the second recessed groove, which is not limited here.

[0176] In one embodiment, the sound-emitting device 100 also includes a shell 1, which is located between the first magnetic yoke 31 and the second magnetic yoke 32, and the edge magnetic portion 34 is connected to the shell 1. Along the direction perpendicular to the first direction, the shell 1 has a third vibration gap with the two deformation portions 2116 respectively, and the two third vibration gaps are respectively connected to the first cavity 314 and the second cavity 324; wherein, the shell 1, the edge magnetic portion 34, the first diaphragm 211, the voice coil 22 and the second diaphragm 212 cooperate to form a third cavity 13, and the sound-emitting device 100 is provided with an air vent 14 connected to the third cavity 13.

[0177] In this embodiment, if Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 As shown, by providing a housing 1, the housing 1 is used to mount the fixed magnetic circuit system 3 and the vibration system 2. It can be understood that the housing 1 is located between the first magnetic yoke 31 and the second magnetic yoke 32 along the first direction, and the first magnetic yoke 31 / the second magnetic yoke 32 and the housing 1 can be connected directly or indirectly, which is not limited here.

[0178] It can be understood that by having a third vibration gap between the shell 1 and the two deformation parts 2116, the two third vibration gaps are connected to the first cavity 314 and the second cavity 324 respectively. In this way, the third vibration gap can be used to provide a vibration space for the deformation part 2116, and it can also ensure that the first diaphragm 211 and the second diaphragm 212 radiate sound waves to the first cavity 314 and the second cavity 324 respectively through the two third vibration gaps.

[0179] In this embodiment, the edge magnet portion 34 is located between the first diaphragm 211 and the second diaphragm 212 and is connected to the housing 1. Thus, the housing 1, edge magnet portion 34, first diaphragm 211, first frame 231 or bracket 24, voice coil 22, second frame 232 or bracket 24, and second diaphragm 212 cooperate to form a third cavity 13. To ensure air pressure balance on opposite sides of the first diaphragm 211 and the second diaphragm 212, the sound-generating device 100 is provided with an air vent 14 that communicates with the third cavity 13.

[0180] Optionally, the housing 1 is provided with an air vent 14. Of course, in other embodiments, the air vent 14 can also be formed by the housing 1 and the edge magnetic portion 34. In one embodiment, Figure 1 As shown, the housing 1 is provided with a mounting hole 15 , and the edge magnet portion 34 is provided in the mounting hole 15 and encloses the mounting hole 15 to form an air leakage hole 14 .

[0181] It is understood that the housing 1 can be a frame structure or frame with both ends open, in which case the first yoke 31 is connected to one end of the housing 1, and the second yoke 32 is located at the end of the housing 1 away from the first yoke 31. Optionally, the housing 1 is made of metal or plastic.

[0182] It should be noted that the housing 1 is used to fix the magnetic circuit system 3 and the vibration system 2, and can also be used to support the first magnetic yoke 31 and the second magnetic yoke 32 of the magnetic circuit system 3, so that the first magnetic yoke 31 and the second magnetic yoke 32 are opposite to each other and spaced apart, thereby providing a vibration space for the first diaphragm 211 and the second diaphragm 212.

[0183] In one embodiment, the housing 1 includes a first shell 11 and a second shell 12 arranged along a first direction, the two ends of the first shell 11 are respectively connected to the edge magnetic portion 34 and the first magnetic yoke 31, and the two ends of the second shell 12 are respectively connected to the edge magnetic portion 34 and the second magnetic yoke 32. There is a third vibration gap between the first shell 11 and a deformation portion 2116, and the third vibration gap is connected to the first cavity 314. There is a third vibration gap between the second shell 12 and another deformation portion 2116, and the third vibration gap is connected to the second cavity 324; wherein, an air vent 14 is provided between the first shell 11 or the second shell 12 or the first shell 11 and the second shell 12.

[0184] In this embodiment, if Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 7As shown, by configuring the housing 1 as a split structure, the first housing 11 and the second housing 12 are arranged along a first direction, thereby utilizing the two ends of the first housing 11 to connect to the edge magnet portion 34 and the first magnetic yoke 31, respectively, and the two ends of the second housing 12 to connect to the edge magnet portion 34 and the second magnetic yoke 32, respectively, thereby achieving a connection and fixation between the housing 1 and the magnetic circuit system 3. Optionally, the edge magnet portion 34 is sandwiched between the first housing 11 and the second housing 12, and the outer surface of the edge magnet portion 34 is flush with the outer surfaces of the first housing 11 and the second housing 12; this helps to reduce the radial size of the sound-generating device 100 and facilitates miniaturization.

[0185] It can be understood that the air vent 14 can be provided in the first shell 11; or, the air vent 14 can be provided in the second shell 12; or, the first shell 11 and the second shell 12 are both provided with the air vent 14; or, the first shell 11 and the second shell 12 cooperate to form the air vent 14, that is, the air vent 14 is provided between the first shell 11 and the second shell 12, which is not limited here.

[0186] Optionally, the air leakage holes 14 include a plurality of air leakage holes 14 , which are arranged at intervals. It can be understood that such an arrangement can improve the smoothness of the air flow in the third cavity 13 .

[0187] It should be noted that the first sound outlet 313 can be provided in the first housing 11 and / or the first magnetic yoke 31. When the first sound outlet 313 is provided in the first housing 11, the first sound outlet 313 communicates with the first cavity 314 via the third vibration gap. Optionally, the first housing 11 is provided with a plurality of first sound outlets 313, which are spaced apart and arranged around the first diaphragm 211, and are spaced apart from the air vent 14.

[0188] Of course, the second sound outlet 323 can be provided in the second housing 12 and / or the second magnetic yoke 32. When the second sound outlet 323 is provided in the second housing 12, the second sound outlet 323 communicates with the second cavity 324 via the third vibration gap. Optionally, the second housing 12 is provided with a plurality of second sound outlets 323, which are spaced apart and arranged around the second diaphragm 212 and spaced apart from the air vent 14.

[0189] In one embodiment, the voice coil 22 includes two long sides 221 and two short sides 222 connected end to end, and includes two side magnetic parts 34. The two side magnetic parts 34 are symmetrically arranged on opposite sides of the voice coil 22 and extend respectively along the extension direction of the long side 221; the first shell 11 is provided with a first support part 16 corresponding to each short side 222, and the two ends of each first support part 16 extend toward the two side magnetic parts 34 and are connected to the two side magnetic parts 34, and the second end 2115 of the first diaphragm 211 is connected to the two side magnetic parts 34 and the two first support parts 16; the second shell 12 is provided with a second support part 17 corresponding to each short side 222, and the two ends of each second support part 17 extend toward the two side magnetic parts 34 and are connected to the two side magnetic parts 34, and the second end 2115 of the second diaphragm 212 is connected to the two side magnetic parts 34 and the two first support parts 16.

[0190] It is understood that a third cavity 13 is formed between the first housing 11, the first support portion 16, the edge magnet portion 34, the first diaphragm 211, the voice coil 22, the second diaphragm 212, the second support portion 17, and the second housing 12. Optionally, the first housing 11 and / or the second housing 12 is provided with an air vent 14, which is located between the first support portion 16 and the second support portion 17.

[0191] In this embodiment, if Figure 3 and Figure 4 As shown, by providing the first support portion 16 on the first housing 11, the first support portion 16 of the first housing 11 can be used in conjunction with the edge magnet portion 34 to secure the first diaphragm 211, and achieve a sealed isolation between the first cavity 314 and the third cavity 13. By providing the second support portion 17 on the second housing 12, the second support portion 17 of the second housing 12 can be used in conjunction with the edge magnet portion 34 to secure the second diaphragm 212, and achieve a sealed isolation between the second cavity 324 and the third cavity 13.

[0192] In one embodiment, the first magnetic yoke 31 includes a first top plate portion 311 and a first side plate portion 312 arranged at an angle, the first central magnet 3311 is provided on the first top plate portion 311, and the end of the first side plate portion 312 away from the first top plate portion 311 is connected to the outer shell 1; the second magnetic yoke 32 includes a second top plate portion 321 and a second side plate portion 322 arranged at an angle, the second central magnet 3312 is provided on the second top plate portion 321, and the end of the second side plate portion 322 away from the second top plate portion 321 is connected to the outer shell 1.

[0193] In this embodiment, if Figure 1 、 Figures 3 to 5 、 Figure 7As shown, by setting the first magnetic yoke 31 as a first top plate portion 311 and a first side plate portion 312 set at an angle, the first side plate portion 312 is connected to the first shell 11, that is, the first side plate portion 312 is used to support the first top plate portion 311 away from the first diaphragm 211, thereby providing a vibration space for the first diaphragm 211.

[0194] In this embodiment, if Figure 1 、 Figures 3 to 5 、 Figure 7 As shown, by setting the second magnetic yoke 32 to be an angled second top plate portion 321 and a second side plate portion 322, the second side plate portion 322 is connected to the second shell 12, that is, the second top plate portion 321 is supported away from the second diaphragm 212 by the second side plate portion 322, thereby providing a vibration space for the second diaphragm 212.

[0195] In one embodiment, the first top plate portion 311 and / or the first side plate portion 312 is provided with a first sound outlet 313 .

[0196] As will be appreciated, a first cavity 314 is formed between the first magnetic yoke 31, the first diaphragm 211, and the vibration plate 213. The first cavity 314 is used to provide a vibration space for the first diaphragm 211 and also provides a mounting space for the first center magnet 3311. To ensure that the first diaphragm 211 can produce sound smoothly during vibration, the sound-generating device 100 is further provided with a first sound outlet 313 that communicates with the first cavity 314.

[0197] In this embodiment, the first top plate portion 311 of the first magnetic yoke 31 is provided with a first sound outlet 313. Alternatively, the first side plate portion 312 of the first magnetic yoke 31 is provided with the first sound outlet 313. Alternatively, both the first top plate portion 311 and the first side plate portion 312 of the first magnetic yoke 31 are provided with the first sound outlet 313, which is not limited here.

[0198] Optionally, the first top plate portion 311 is provided with a plurality of first sound holes 313, and the plurality of first sound holes 313 are arranged at intervals. Figures 1 to 5 、 Figure 7 As shown, multiple first sound holes 313 are spaced apart and arranged around the first central magnet 3311. Optionally, the multiple first sound holes 313 are all opposite the folding ring portion 2112 of the first diaphragm 211. This arrangement facilitates smooth and rapid flow of sound waves in the first cavity 314, thereby improving the sound effect.

[0199] Optionally, the first side plate part 312 is provided with a plurality of first sound holes 313 which are arranged at intervals. By arranging a plurality of first sound holes 313, the plurality of first sound holes 313 are all in communication with the first cavity 314, so as to improve the radiation speed and area of the first sound wave in the first cavity 314, improve the sound emission effect, and meanwhile realize weight reduction.

[0200] In an embodiment, the second top plate part 321 and / or the second side plate part 322 is provided with a second sound hole 323.

[0201] It can be understood that the second magnetic yoke 32 and the second diaphragm 212 and the vibrating plate 213 form a second cavity 324, and the second cavity 324 is used to provide a vibrating space for the second diaphragm 212 and provide a mounting space for the second center magnet 3312. In order to make the second diaphragm 212 emit sound smoothly during vibration, the sound emitting device 100 is further provided with a second sound hole 323 which is in communication with the second cavity 324.

[0202] In the embodiment, the second top plate part 321 of the second magnetic yoke 32 is provided with a first sound hole 313. Alternatively, the second side plate part 322 of the second magnetic yoke 32 is provided with a first sound hole 313. Alternatively, the second top plate part 321 and the second side plate part 322 of the second magnetic yoke 32 are both provided with a first sound hole 313, which is not limited herein.

[0203] Optionally, the second top plate part 321 is provided with a plurality of second sound holes 323 which are arranged at intervals. In the embodiment, as shown in Figure 3 、 Figure 5 、 Figure 7 , the plurality of second sound holes 323 are arranged at intervals and surround the second center magnet 3312. Optionally, the plurality of second sound holes 323 are all opposite to the folded ring part 2112 of the second diaphragm 212. In this way, the sound wave airflow of the second cavity 324 can flow smoothly and quickly, so as to improve the sound emission effect.

[0204] Optionally, the second side plate part 322 is provided with a plurality of second sound holes 323 which are arranged at intervals. By arranging a plurality of second sound holes 323, the plurality of second sound holes 323 are all in communication with the second cavity 324, so as to improve the radiation speed and area of the second sound wave in the second cavity 324, improve the sound emission effect, and meanwhile realize weight reduction.

[0205] It should be noted that the first sound outlet 313 of the sound-emitting device 100 is provided on the first top plate portion 311 and is opposite to the first diaphragm 211, and the second sound outlet 323 is provided on the second top plate portion 321 and is opposite to the second diaphragm 212. When the sound-emitting device 100 is used in an electronic device or a sound-emitting module, the housing of the electronic device or the sound-emitting module is provided with sound outlets that are directly opposite to the first sound outlet 313 and the second sound outlet 323, respectively. This allows the electronic device or the sound-emitting module to have a positive sound-emitting structure, that is, the sound waves emitted from the first sound outlet 313 and the second sound outlet 323 of the sound-emitting device 100 form a dipole, thereby effectively reducing sound leakage.

[0206] Of course, in other embodiments, the first sound outlet 313 of the sound-emitting device 100 is provided on the first side panel portion 312, and the second sound outlet 323 is provided on the second side panel portion 322. When the sound-emitting device 100 is applied to an electronic device or a sound-emitting module, the sound outlet on the shell of the electronic device or the sound-emitting module is located on one side of the sound-emitting device 100, so that the sound outlet is connected to the first sound outlet 313 / the second sound outlet 323 through the sound outlet channel, thereby making the electronic device or the sound-emitting module have a side sound-emitting structure.

[0207] In one embodiment, the vibration system 2 also includes a centering support plate 25 provided in the third cavity 13. The centering support plate 25 includes an external fixing portion 251, an internal fixing portion 252, and an elastic arm portion 253 connecting the external fixing portion 251 and the internal fixing portion 252. The external fixing portion 251 is connected to the outer shell 1, and the internal fixing portion 252 is connected to the voice coil 22.

[0208] In this embodiment, if Figure 3 and Figure 4 As shown, by providing a centering support plate 25, one end of the centering support plate 25 is connected to the housing 1, and the other end of the centering support plate 25 is connected to the voice coil 22. In this way, the centering support plate 25 can be used to center the voice coil 22, thereby preventing the voice coil 22 from polarizing or swinging during the vibration process, thereby improving the operating stability of the vibration system 2.

[0209] Understandably, Figure 3 As shown, by configuring the centering support 25 as an outer fixing portion 251, an elastic arm portion 253, and an inner fixing portion 252, the outer fixing portion 251 is connected to the housing 1. The inner fixing portion 252 is provided with a first soldering pad. When the inner fixing portion 252 is connected to the voice coil 22, the lead of the voice coil 22 is electrically connected to the first soldering pad. Thus, the centering support 25 can also achieve electrical connection between an external circuit and the voice coil 22. Optionally, the elastic arm portion 253 has at least one bent section.

[0210] Optionally, the outer fixing portion 251 of the centering support 25 is sandwiched between the first shell 11 and the second shell 12 of the housing 1 .

[0211] It should be noted that the centering vane 25 can be one or more. When the centering vane 25 is one, the outer fixing portion 251 of the centering vane 25 is annular, and the elastic arm portion 253 and the inner fixing portion 252 include a plurality of, for example, the elastic arm portion 253 includes two or four, the inner fixing portion 252 includes four, and the like, which are not limited herein. When the centering vane 25 is more than one, the outer fixing portion 251, the elastic arm portion 253 and the inner fixing portion 252 all include a plurality of, at this time, the centering vane 25 can be two or four, for example, when the centering vane 25 is two, the two centering vanes 25 are symmetrically arranged and distributed along the long axis or the short axis of the shell 1; or, when the centering vane 25 is four, the four centering vanes 25 are arranged corresponding to the four corners of the shell 1, which are not limited herein.

[0212] In an embodiment, the voice coil 22 includes two long edges 221 connected end to end and two short edges 222, and the edge magnetic portion 34 includes two, the two edge magnetic portions 34 are symmetrically arranged on opposite sides of the voice coil 22 and are respectively opposite and spaced apart from the two long edges 221, and the two edge magnetic portions 34 respectively extend along the extension direction of the long edge 221.

[0213] Of course, in other embodiments, the edge magnetic portion 34 includes four, two edge magnetic portions 34 are opposite and spaced apart from the two long edges 221, and the other two edge magnetic portions 34 are opposite and spaced apart from the two short edges 222, which are not limited herein.

[0214] In the present embodiment, as shown in Figure 3 , Figures 5 to 10 , the edge magnetic portion 34 includes two, the two edge magnetic portions 34 are symmetrically arranged on opposite sides of the voice coil 22 and are respectively opposite and spaced apart from the two long edges 221, and the two edge magnetic portions 34 respectively extend along the extension direction of the long edge 221.

[0215] When the centering vane 25 includes one, the outer fixing portion 251 is annular, and the elastic arm portion 253 and the inner fixing portion 252 both include four, the two ends of each elastic arm portion 253 are respectively connected with the outer fixing portion 251 and an inner fixing portion 252, the four elastic arm portions 253 and the four inner fixing portions 252 are all located on the inner side of the outer fixing portion 251, and two elastic arm portions 253 and two inner fixing portions 252 are arranged corresponding to one short edge 222, and the other two elastic arm portions 253 and the other two inner fixing portions 252 are arranged corresponding to the other short edge 222.

[0216] When the centering vane 25 includes two, the two centering vanes 25 are arranged corresponding to the two short edges 222. It can be understood that each centering vane 25 includes an outer fixing portion 251, at least one elastic arm portion 253 and two inner fixing portions 252, which are not limited herein.

[0217] When there are four centering supports 25, two centering supports 25 are provided at the ends of one short side 222, and the other two centering supports 25 are provided at the ends of the other short side 222. It is understood that each centering support 25 includes an outer fixing portion 251, an elastic arm portion 253, and an inner fixing portion 252, which is not limited here.

[0218] In this embodiment, each of the elastic arm portions 253 and the internal fixing portions 252 includes four, and the two ends of each elastic arm portion 253 are respectively connected to the external fixing portion 251 and an internal fixing portion 252, and two elastic arm portions 253 and two internal fixing portions 252 are arranged corresponding to one short side 222, and the other two elastic arm portions 253 and the other two internal fixing portions 252 are arranged corresponding to the other short side 222.

[0219] The present invention further provides an electronic device comprising the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is similar to that of the aforementioned embodiments. Since the present electronic device utilizes all the technical solutions of all the aforementioned embodiments, it at least has all the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and thus will not be described in detail here.

[0220] Optionally, the electronic device may be a mobile phone, earphones, a computer, a PAD, a smart wearable device, etc., and the present invention does not impose any specific restrictions on this.

[0221] In this embodiment, the electronic device is provided with an installation cavity and a first sound outlet and a second sound outlet connected to the installation cavity. The sound-emitting device 100 is provided in the installation cavity. The first sound outlet 313 of the sound-emitting device 100 is connected to the first sound outlet, and the second sound outlet 323 of the sound-emitting device 100 is connected to the second sound outlet.

[0222] It can be understood that the electronic device also includes a device housing, which is provided with an installation cavity and a first sound outlet and a second sound outlet connected to the installation cavity. The sound-emitting device 100 is arranged in the installation cavity of the device housing, and the first sound outlet 313 of the sound-emitting device 100 is connected to the first sound outlet, and the second sound outlet 323 of the sound-emitting device 100 is connected to the second sound outlet.

[0223] In one embodiment, the electronic device is smart glasses, which include temples, each of which is provided with a mounting cavity, a first sound outlet, and a second sound outlet; wherein the first sound outlet and the second sound outlet are located on two opposite surfaces of the temple along a first direction, and one of the surfaces faces the user's ear.

[0224] It is understood that smart glasses can be AR / VR / MR glasses, etc., which is not limited here. In this embodiment, by disposing the sound-generating device 100 in the mounting cavity of the glasses leg, the sound-generating device 100 divides the mounting cavity of the glasses leg into two front cavities and a rear cavity. To facilitate sound emission and air release, the glasses leg is further provided with a first sound outlet and a second sound outlet respectively connecting the two front cavities, and an air release port connecting the rear cavity.

[0225] Optionally, the first sound outlet and the second sound outlet are located on two opposite surfaces of the glasses leg along the first direction, and one of the surfaces faces the ear of the user.

[0226] In this embodiment, the height of the temple is the height of the temple along the first direction, and the thickness of the temple is the thickness of the temple along the second direction. The height of the temple corresponds to the height of the sound-emitting device 100 along the first direction, and the thickness of the temple corresponds to the width of the sound-emitting device 100. It can be understood that by locating the first sound outlet and the second sound outlet on two opposite surfaces of the temple along the first direction, less space is occupied in the thickness direction of the temple, the entire product can be made thinner, and the comfort of the user when wearing the temple of the smart glasses is improved.

[0227] It should be noted that the first sound outlet 313 and the second sound outlet 323 of the sound-emitting device 100 are respectively connected to the two front cavities, and the air discharge hole 14 of the sound-emitting device 100 is connected to the rear cavity. In this way, the smart glasses can make sounds through the first sound outlet and the second sound outlet, and discharge air through the air discharge hole, and use the sound waves radiated outward from the first sound outlet and the second sound outlet. From a fixed position at a relatively far distance in the environment, since the positions of the two sound waves are relatively close, it can be considered that the distances of the fixed position relative to the two sound waves are approximately the same, so that the two sound waves will produce two equal and opposite sound fields. Therefore, the fixed position will receive two equal and opposite phase sound waves. According to the superposition effect of dipoles, the sound waves at the fixed position can be offset to the greatest extent, which greatly improves the sound leakage problem of the smart glasses during use, protects the user's privacy, and improves the user experience.

[0228] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or direct / indirect applications 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: a vibration system comprising a diaphragm assembly and a voice coil, the diaphragm assembly comprising a first diaphragm, a second diaphragm, and a vibration plate, the first diaphragm and the second diaphragm both vibrating in a first direction, the first diaphragm and the second diaphragm being spaced apart along the first direction and respectively connected to both ends of the voice coil along the first direction, the vibration plate being located inside the voice coil, and the outer periphery of the vibration plate being disposed in contact with the inner circumferential wall of the voice coil; and a magnetic circuit system comprising a central magnetic portion and a side magnetic portion, the side magnetic portion being disposed between the first diaphragm and the second diaphragm and outside the voice coil, the central magnetic portion comprising two central magnets disposed opposite and spaced apart along the first direction, the two central magnets being located on either side of the diaphragm along the first direction, the two central magnets being magnetized along the first direction in opposite directions, and the side magnetic portion and the central magnetic portion cooperating to form a magnetic gap for accommodating the voice coil; Among them, the first diaphragm and the second diaphragm both include a deformation part and a first end and a second end arranged at both ends of the deformation part along the first direction, the two first ends are respectively connected to the two ends of the voice coil, and at least parts of the two second ends are respectively connected to the edge magnetic parts, the sound-emitting device is formed with a first cavity and a second cavity located on both sides of the vibration plate along the first direction, the two central magnets are exposed to the first cavity and the second cavity respectively on the side facing the vibration plate, and the sound-emitting device is also provided with a first sound outlet hole and a second sound outlet hole respectively connecting the first cavity and the second cavity.

2. The sound-generating device according to claim 1, wherein: The deformation portion is provided with at least one bending portion along the first direction, and the opening of the bending portion faces a direction perpendicular to the first direction; And / or, the first diaphragm and the vibration plate radiate a first sound wave toward the first cavity, and the second diaphragm and the vibration plate radiate a second sound wave toward the second cavity, and the first sound wave and the second sound wave have opposite phases.

3. The sound-generating device according to claim 1, wherein: The voice coil includes two long sides and two short sides connected end to end, and the side magnets include two side magnets, which are symmetrically arranged on opposite sides of the voice coil and extend respectively along the extension direction of the long sides; The sound-generating device also includes a shell, which is provided with a support portion corresponding to each short side. The two ends of each support portion extend toward the two edge magnetic portions and are surrounded by the two edge magnetic portions to form a ring. Each second end is connected to the two edge magnetic portions and the two support portions.

4. The sound-generating device according to claim 1, wherein: The vibration system also includes a first skeleton and a second skeleton, wherein the two ends of the first skeleton along the first direction are respectively connected to one first end and one end of the voice coil, and the two ends of the second skeleton along the first direction are respectively connected to the other first end and the other end of the voice coil.

5. The sound-generating device according to claim 4, wherein: One end of the first frame and / or the second frame adjacent to the first end is bent and extended toward the first end to form a first bent portion, and the first bent portion is connected to the first end; wherein a projection of the deformed portion along the first direction at least partially overlaps with the first bent portion; And / or, one end of the first skeleton and / or the second skeleton adjacent to the voice coil is bent and extended to form a second bent portion, and the second bent portion is connected to the end of the voice coil; or one end of the first skeleton and / or the second skeleton adjacent to the voice coil extends along the inner surface of the voice coil and is connected to the inner surface of the voice coil; And / or, along a direction perpendicular to the first direction, a first vibration gap is formed between the first skeleton and the second skeleton and the two deformation parts respectively.

6. The sound-generating device according to claim 1, wherein: The vibration system further includes a bracket, the bracket being disposed on an inner side of the voice coil and extending along the first direction and protruding from two ends of the voice coil along the first direction, the two first ends being respectively connected to two ends of the bracket along the first direction, and the outer periphery of the vibration plate being connected to the bracket; Wherein, the bracket is connected to the vibration plate by bonding or welding; And / or, both ends of the bracket along the first direction are bent and extended to form edge portions, each edge portion is connected to one of the first ends; wherein the projection of the deformable portion along the first direction at least partially overlaps with the edge portion; And / or, along a direction perpendicular to the first direction, a second vibration gap is formed between the bracket and the two deformation parts respectively.

7. The sound-generating device according to claim 1, wherein: The projections of the two central magnets along the first direction are located inside the voice coil; And / or, the thickness of the edge magnet portion along the first direction is greater than the extension length of the voice coil along the first direction, and is not greater than 3 times the extension length of the voice coil along the first direction; And / or, the first diaphragm and the second diaphragm are symmetrically arranged relative to the vibration plate; And / or, the two central magnets are symmetrically arranged relative to the vibration plate; And / or, the voice coil is an integrally wound structure and extends along the first direction; or, the voice coil includes a first sub-voice coil and a second sub-voice coil provided on opposite sides of the vibration plate; And / or, a peripheral edge of the vibration plate is bent and extended toward the inner surface of the voice coil to form an extension portion, and the extension portion is connected to the inner surface of the voice coil.

8. The sound-generating device according to claim 1, wherein: The edge magnet portion includes two edge magnets stacked along the first direction and an edge magnetic conductive plate disposed between the two edge magnets, and the two second ends are respectively connected to one side of the two edge magnets facing away from the edge magnetic conductive plate; The two side magnets are magnetized along the first direction and in opposite directions, and the magnetic poles at the ends of the two side magnets that are away from each other are opposite in polarity to the magnetic poles at the ends of the two center magnets that are away from each other.

9. The sound-generating device according to claim 1, wherein: The magnetic circuit system further includes a first magnetic yoke and a second magnetic yoke disposed opposite to each other, the two central magnets including a first central magnet and a second central magnet, the first central magnet being connected to the first magnetic yoke on a side facing away from the vibration plate, and the second central magnet being connected to the second magnetic yoke on a side facing away from the vibration plate; The first cavity is formed between the first diaphragm, the voice coil, the vibration plate and the first magnetic yoke, and the second cavity is formed between the second diaphragm, the voice coil, the vibration plate and the second magnetic yoke. The first magnetic yoke and the second magnetic yoke are respectively provided with the first sound outlet and the second sound outlet.

10. The sound-generating device according to claim 9, wherein: The sound-generating device further includes a housing, the housing being located between the first magnetic yoke and the second magnetic yoke, the edge magnetic portion being connected to the housing, and a third vibration gap being defined between the housing and the two deformable portions in a direction perpendicular to the first direction, the two third vibration gaps being connected to the first cavity and the second cavity, respectively; The housing, the edge magnet, the first diaphragm, the voice coil and the second diaphragm cooperate to form a third cavity, and the sound-generating device is provided with an air vent connected to the third cavity.

11. The sound generating device according to claim 10, wherein: The housing includes a first shell and a second shell arranged along the first direction, two ends of the first shell are respectively connected to the edge magnet portion and the first magnetic yoke, and two ends of the second shell are respectively connected to the edge magnet portion and the second magnetic yoke, a third vibration gap is defined between the first shell and one of the deformation portions, and the third vibration gap is communicated with the first cavity, and a third vibration gap is defined between the second shell and the other of the deformation portions, and the third vibration gap is communicated with the second cavity; Wherein, the air leakage hole is provided in the first shell or the second shell or between the first shell and the second shell.

12. The sound generating device according to claim 10, wherein: The first magnetic yoke includes a first top plate portion and a first side plate portion arranged at an angle, the first central magnet is arranged on the first top plate portion, and one end of the first side plate portion away from the first top plate portion is connected to the housing; The second magnetic yoke includes a second top plate portion and a second side plate portion arranged at an angle, the second central magnet is arranged on the second top plate portion, and one end of the second side plate portion away from the second top plate portion is connected to the housing; Wherein, the first top plate portion and / or the first side plate portion is provided with the first sound outlet hole, and the second top plate portion and / or the second side plate portion is provided with the second sound outlet hole.

13. An electronic device, characterized in that: The electronic device comprises a sound-generating device according to any one of claims 1 to 12; The electronic device is provided with an installation cavity and a first sound outlet and a second sound outlet connected to the installation cavity. The sound-emitting device is provided in the installation cavity. The first sound outlet of the sound-emitting device is connected to the first sound outlet, and the second sound outlet of the sound-emitting device is connected to the second sound outlet.

14. The electronic device according to claim 13, wherein: The electronic device is a pair of smart glasses, which include temples, each of which is provided with the mounting cavity, the first sound outlet, and the second sound outlet; The first sound outlet and the second sound outlet are located on two opposite surfaces of the glasses leg along the first direction, and one of the surfaces faces the ear of the user.

Images