Sound production device and sound production module

Abstract

The application discloses a sound production device and a sound production module, and relates to the technical field of loudspeakers. The sound production device comprises a shell, a vibration assembly, a magnetic circuit assembly and two transmission mechanisms. The vibration assembly comprises two diaphragms and two voice coils. The two diaphragms are connected to two opposite ends of the shell along a first direction. The two voice coils have a first side close to each other and a second side away from each other. The magnetic circuit assembly is located between the two diaphragms. Under the action of magnetic force, the two voice coils can oscillate along an axis extending in a third direction. In a second direction, the voice coil has the first side and the second side located on both sides of the rotation axis of the voice coil. The two transmission mechanisms are located on both sides of the two voice coils along the first direction and can convert the rotary motion of the voice coil into linear motion along the first direction of the diaphragm. The two transmission mechanisms are connected to the first side and the second side of the two voice coils respectively and drive the two diaphragms to vibrate in opposite directions along the first direction, so that the two diaphragms have a vibration trend of synchronously protruding outward or synchronously sinking inward.

Description

Technical Field

[0001] This invention relates to the field of loudspeaker technology, and particularly to sound-generating devices and sound-generating modules. Background Technology

[0002] In conventional loudspeakers, the voice coil and diaphragm vibrate in the same direction. To increase the diaphragm's vibration amplitude, the physical height of the entire driving structure, including the magnetic circuit system and voice coil, must be increased accordingly, resulting in an increase in the overall height of the product. Current smart products are trending towards thinner and lighter designs, leading to limited internal space and thus restricting the product's vibration amplitude. Summary of the Invention

[0003] The main objective of this invention is to propose a sound-generating device and a sound-generating module that optimizes the vibration transmission mode of the voice coil and diaphragm, thereby reducing the limitation of product thickness on the voice coil travel.

[0004] To achieve the above objectives, the present invention provides a sound-generating device, the sound-generating device comprising:

[0005] case;

[0006] A vibration assembly, comprising two diaphragms and two voice coils, wherein the two diaphragms are respectively connected to opposite ends of the housing along a first direction, and the two voice coils are disposed between the two diaphragms and arranged along a second direction, and the two voice coils have a first side that is close to each other and a second side that is far from each other;

[0007] A magnetic circuit assembly, connected to the housing and located between the two diaphragms, has two magnetic gaps spaced apart along a second direction to accommodate the two voice coils, allowing both voice coils to oscillate along a third-direction axis under magnetic force; and,

[0008] Two transmission mechanisms are located on opposite sides of the two voice coils along a first direction. Each transmission mechanism has a first end and a second end arranged opposite to each other along the first direction. The first end is connected to the diaphragm, and the second end is connected to the voice coil. The transmission mechanism can convert the rotational motion of the voice coil into the linear motion of the diaphragm along the first direction. The two transmission mechanisms are respectively connected to the first side and the second side of the two voice coils. The two voice coils drive the two diaphragms to vibrate in opposite directions along the first direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0009] In one embodiment, the first side and the second side are the major axes of the voice coil; and / or,

[0010] The two voice coils rotate in opposite directions, and the two transmission mechanisms move in opposite directions; and / or,

[0011] The centerline of the voice coil is coplanar with the axis of rotation of the voice coil.

[0012] In one embodiment, the magnetic circuit assembly includes two magnetic groups arranged sequentially along a second direction. Each magnetic group includes a central magnetic part and two side magnetic parts. The two side magnetic parts are disposed on opposite sides of the central magnetic part along the second direction. The two side magnetic parts and the central magnetic part together define a magnetic gap.

[0013] In one embodiment, in each of the magnetic groups, the central magnetic portion and the two side magnetic portions are all magnetized along the second direction, and the magnetization directions are the same; the magnetization directions of the central magnetic portions of the two magnetic groups are opposite; or,

[0014] In each of the magnetic groups, the central magnetic part and the two side magnetic parts are magnetized along the second direction and the magnetization direction is the same. The magnetization direction of the central magnetic part of the two magnetic groups is the same. The side magnetic parts that are close to each other in the two magnetic groups are either integrally arranged or separately arranged.

[0015] In one embodiment, the side magnetic portion located on the side of the voice coil away from the other magnetic group is the first side magnetic portion, and the side magnetic portion located on the side of the voice coil closer to the other magnetic group is the second side magnetic portion. In each magnetic group, the central magnetic portion and the first side magnetic portion are magnetized along the second direction, and the magnetization directions are the same. The second side magnetic portion includes a first side magnet and a second side magnet stacked along the first direction. The magnetization directions of the first side magnet and the second side magnet are both set at an angle to the second direction. The magnetic poles of the first side magnet and the second side magnet near the magnetic gap are opposite in polarity to the magnetic poles of the central magnetic portion near the second side magnetic portion. The magnetization directions of the central magnetic portions of the two magnetic groups are opposite.

[0016] In one embodiment, the angle between the magnetization direction of the first side magnet and the second direction is 0° to 80°; and / or,

[0017] The angle between the magnetization direction of the second side magnet and the second direction is 0~80°; and / or,

[0018] One of the first side magnet and the second side magnet has a notch to accommodate the corresponding transmission mechanism.

[0019] In one embodiment, the two side magnetic portions include a first side magnetic portion located on the side of the voice coil away from the other magnetic group, and a second side magnetic portion located on the side of the voice coil close to the other magnetic group. The first side magnetic portion and the second side magnetic portion are respectively provided with protrusions on opposite sides along the first direction. The regions of the protrusions adjacent to each other form a clearance groove, which is used to avoid the corresponding part of the transmission mechanism.

[0020] In one embodiment, each of the transmission mechanisms includes two linkage mechanisms arranged opposite to each other along a second direction, and the two linkage mechanisms are respectively connected to the two voice coils;

[0021] In the two transmission mechanisms, the two linkage mechanisms connecting the same voice coil are respectively connected to the first side and the second side of the voice coil.

[0022] In one embodiment, each of the linkage mechanisms includes a first linkage, a second linkage, and a third linkage connected in sequence. The first linkage is connected to the diaphragm, the third linkage is connected to the voice coil, and the second linkage is connected to the first linkage and the third linkage through a first flexible part.

[0023] In one embodiment, the linkage mechanism further includes a flexible pad, wherein the first link, the second link, and the third link are all fixedly connected to the flexible pad, such that the portion of the flexible pad located between the second link and the first link and the third link forms the first flexible portion; and / or,

[0024] Multiple second links are provided, and the multiple second links are arranged at intervals along a third direction; and / or,

[0025] In each of the aforementioned linkage mechanisms, the rotation axes of the first link and the second link rotating relative to each other are coplanar with the projections of the corresponding voice coil's rotation axis along the first direction; and / or,

[0026] In each of the linkage mechanisms, the distance between the rotation centers of the two first flexible parts is L1, and the distance between the rotation center of the first flexible part closest to the corresponding voice coil and the rotation center of the voice coil is L2. When the vibration assembly is in the equilibrium position, L1=L2.

[0027] In one embodiment, the sound-generating device further includes two rotating engagement structures that cooperate with the two voice coils. The rotating engagement structure includes two first connectors and two second connectors. The two second connectors are respectively connected to the two sides of the voice coils along a third direction. The two first connectors are connected to the two second connectors and the housing. The cooperating first connectors and second connectors are capable of rotating relative to each other along an axis extending in a third direction.

[0028] In one embodiment, the cooperating first and second connecting members are connected via a second flexible portion. Both the first and second connecting members include a main body and a protrusion. The main body of the first connecting member is connected to the housing. The protrusion of the first connecting member connects to the middle of the second flexible portion and is located on the rotation axis of the corresponding voice coil. The second connecting member has two protrusions, respectively connecting to opposite sides of the second flexible portion along a third direction. The main body of the second connecting member is connected to the linkage mechanism; and / or,

[0029] The second connector is stepped; and / or,

[0030] The second connector and one of the linkage mechanisms are connected as a single unit.

[0031] In one embodiment, the housing includes a first housing and two second housings respectively connected to the first housing on opposite sides in a first direction, and at least one vent hole is provided on the side surface of the first housing;

[0032] The two diaphragms are respectively connected to the two second housings;

[0033] The magnetic circuit assembly is connected to the first housing.

[0034] In one embodiment, the vent is provided on the side surface of the first housing and one of the second housings; and / or,

[0035] The first housing includes a base plate and a side enclosure surrounding the base plate. The side enclosure is provided with the ventilation holes. A hollow portion is formed in the middle of the base plate to allow one of the transmission mechanisms to pass through. The magnetic circuit assembly is fixed to the base plate.

[0036] In one embodiment, the peripheral side of the housing is provided with vent holes;

[0037] The present invention also proposes a sound-generating module, including a housing and a sound-generating device, wherein the sound-generating device includes:

[0038] case;

[0039] A vibration assembly, comprising two diaphragms and two voice coils, wherein the two diaphragms are respectively connected to opposite ends of the housing along a first direction, and the two voice coils are disposed between the two diaphragms and arranged along a second direction, and the two voice coils have a first side that is close to each other and a second side that is far from each other;

[0040] A magnetic circuit assembly, connected to the housing and located between the two diaphragms, has two magnetic gaps spaced apart along a second direction to accommodate the two voice coils, allowing both voice coils to oscillate along a third-direction axis under magnetic force; and,

[0041] Two transmission mechanisms are located on opposite sides of the two voice coils along a first direction. Each transmission mechanism has a first end and a second end arranged opposite to each other along the first direction. The first end is connected to the diaphragm, and the second end is connected to the voice coil. The transmission mechanism can convert the rotational motion of the voice coil into the linear motion of the diaphragm along the first direction. The two transmission mechanisms are respectively connected to the first side and the second side of the two voice coils. The two voice coils drive the two diaphragms to vibrate in opposite directions along the first direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0042] The casing has a vent hole on its peripheral side; the outer shell includes a main body and a sound-emitting part located on the side of the main body. The main body covers the two opposite sides of the sound-emitting device along a first direction. The main body is connected to the vibration assembly and forms two front cavities between itself and the two diaphragms. The sound-emitting part communicates with the two front cavities. A through hole is opened on the side surface of the main body. The through hole communicates with the vent hole so that the vent hole communicates with the external space of the outer shell.

[0043] In the technical solution of this invention, by rationally designing the magnetic field distribution of the magnetic circuit assembly, the voice coil can be rotated along a third-direction axis under the influence of magnetic force after being energized. When the voice coil rotates, the transmission mechanism is driven to move, thus converting the rotational motion of the voice coil into the linear motion of the two diaphragms. By defining the correspondence between the two transmission mechanisms and the first and second sides of the voice coil, the two diaphragms can be driven to vibrate synchronously and in opposite directions, resulting in a synchronous outward bulge or inward inward concavity vibration tendency. The cooperation between the two voice coils and the two transmission mechanisms provides a stable pulling force to the diaphragms, while simultaneously canceling out the horizontal component forces generated during the movement of the two transmission mechanisms, thereby ensuring stable vibration of the diaphragms in the first direction. This structure transforms the existing mode of voice coil vibration along a direction parallel or perpendicular to the vibration direction into voice coil rotation. With the same product thickness, the voice coil has a larger rotational space, thus enabling a larger displacement. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0045] Figure 1 An exploded view of the first embodiment of the sound-generating device provided by the present invention;

[0046] Figure 2 for Figure 1 A cross-sectional schematic diagram of the equilibrium state of the vibration component;

[0047] Figure 3 for Figure 1 A schematic diagram of the first embodiment of the transmission mechanism;

[0048] Figure 4 for Figure 1 A schematic diagram of the connection between the transmission mechanism and the rotating engagement structure and the voice coil;

[0049] Figure 5 for Figure 1 A schematic diagram of an embodiment of the transmission mechanism;

[0050] Figure 6 for Figure 5 Cross-sectional schematic diagram of the central linkage mechanism;

[0051] Figure 7 for Figure 5 Exploded view of the rotating fit structure;

[0052] Figure 8 for Figure 1 A schematic diagram of the second embodiment of the transmission mechanism;

[0053] Figure 9 for Figure 1 A schematic diagram of the third embodiment of the transmission mechanism;

[0054] Figure 10 for Figure 1 A schematic diagram of the fourth embodiment of the central transmission mechanism;

[0055] Figure 11 for Figure 1 A schematic diagram of the first magnetization scheme for the central magnetic circuit component;

[0056] Figure 12 for Figure 1 Schematic diagram of the middle magnetic circuit assembly;

[0057] Figure 13 for Figure 1Exploded view of the inner shell and diaphragm;

[0058] Figure 14 for Figure 1 A schematic diagram of the engagement between the vibration assembly and the support plate;

[0059] Figure 15 for Figure 1 A schematic diagram showing the interaction between the sound-generating device and the outer casing;

[0060] Figure 16 for Figure 11 Simulation results of the magnetic field in the magnetization scheme;

[0061] Figure 17 The magnetic field simulation effect diagram of the second magnetization scheme of the sound-generating device provided by the present invention.

[0062] Explanation of icon numbers:

[0063] 100. Sound-generating device; 1. Housing; 11. First housing; 111. Hollowed-out portion; 112. Boss; 12. Second housing; 121. Vent hole; 2. Vibration assembly; 21. Diaphragm; 22. Voice coil; 221. First side; 222. Second side; 23. Transmission mechanism; 231. First connecting rod; 232. Second connecting rod; 233. Third connecting rod; 234. First flexible part; 235. Flexible pad; 24. Rotational fit structure; 241. First connecting piece; 2 42. Second connector; 243. Second flexible part; 244. Rotating shaft part; 245. Bushing part; 2401. Main body; 2402. Protrusion; 3. Magnetic circuit assembly; 31. Central magnet part; 32. Side magnet part; 321. First side magnet part; 322. Second side magnet part; 3221. First side magnet; 3222. Second side magnet; 324. Protrusion; 325. Clearance groove; 4. Outer shell; 41. Main body part; 411. Through hole; 42. Sound outlet part; 5. Support piece.

[0064] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0065] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0066] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0067] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0068] In conventional loudspeaker vibration systems, the voice coil typically vibrates perpendicular to the magnet, thus its maximum amplitude is limited by the height of both the voice coil and the magnet. As the amplitude gradually increases, the effective size of the voice coil within the magnetic gap gradually decreases. When the amplitude reaches a large value, the voice coil may jump out of the magnetic gap, affecting its ability to drive the voice coil to achieve large-amplitude vibrations, further limiting the loudspeaker's performance. Meanwhile, current smart products are rapidly developing towards thinner and lighter designs, with increasingly compact internal spaces, making it difficult to increase the height of the loudspeaker. This further restricts the loudspeaker's amplitude, limiting its overall sound performance potential.

[0069] This invention proposes a sound-generating device capable of producing sound from both sides. By converting the oscillating motion of the voice coil into the up-and-down vibration of the diaphragm, a large displacement amplitude of the loudspeaker can be achieved without increasing the thickness of the product.

[0070] Please refer to Figures 1 to 2The sound-generating device 100 includes a housing 1, a vibration assembly 2, a magnetic circuit assembly 3, and two transmission mechanisms 23. The vibration assembly 2 includes two diaphragms 21 and two voice coils 22. The two diaphragms 21 are respectively connected to opposite ends of the housing 1 along a first direction. The two voice coils 22 are disposed between the two diaphragms 21 and arranged along a second direction. The two voice coils 22 have a first side 221 that is close to each other and a second side 222 that is far apart from each other. The magnetic circuit assembly 3 is connected to the housing 1 and located between the two diaphragms 21. The magnetic circuit assembly 3 has two magnetic gaps spaced apart along the second direction to accommodate the two voice coils 22 and to make... Both voice coils 22 can swing along a third-direction axis under the action of magnetic force. Two transmission mechanisms 23 are located on opposite sides of the two voice coils 22 along the first direction. Each transmission mechanism 23 has a first end and a second end arranged opposite to each other along the first direction. The first end is connected to the diaphragm 21 and the second end is connected to the voice coil 22. The transmission mechanism 23 can convert the rotational motion of the voice coil 22 into the linear motion of the diaphragm 21 along the first direction. The two transmission mechanisms 23 are respectively connected to the first side 221 and the second side 222 of the two voice coils 22. The two voice coils 22 drive the two diaphragms 21 to vibrate in opposite directions along the first direction.

[0071] In the technical solution of this invention, by rationally designing the magnetic field distribution of the magnetic circuit component 3, the voice coil 22 can be rotated along a third-direction axis under the action of magnetic force after being energized. When the voice coil 22 rotates, the transmission mechanism 23 is driven to move, thus converting the rotational motion of the voice coil 22 into the linear motion of the two diaphragms 21. By defining the correspondence between the two transmission mechanisms 23 and the first side 221 and the second side 222 of the voice coil 22, the two diaphragms 21 can be driven to vibrate synchronously and in opposite directions, thus having a vibration tendency to bulge outwards or inwards synchronously. The cooperation between the two voice coils 22 and the two transmission mechanisms 23 can provide a stable pulling force to the diaphragms 21, while also allowing the horizontal component force generated during the movement of the two transmission mechanisms 23 to cancel each other out, thereby ensuring the stable vibration of the diaphragms 21 in the first direction. This structure converts the existing mode of the voice coil 22 vibrating in a direction parallel or perpendicular to the vibration direction into the rotation of the voice coil 22. Under the same product thickness, the voice coil 22 has a larger rotation space, thus enabling a larger displacement. Meanwhile, the sound signals generated by the two diaphragms 21 during operation are in-phase signals. After synchronous superposition processing, this not only significantly increases the amount of air pushed by the diaphragms, but also effectively enhances the sound pressure level.

[0072] It should be noted that the first direction, second direction, and third direction shown in this invention are perpendicular to each other and are relative directions. Depending on the different usage states and placement positions of the product, the first direction, second direction, and third direction can correspond to the up-down direction, the front-back direction, and the left-right direction. In this embodiment, the first direction corresponds to the thickness direction of the voice coil 22, the second direction corresponds to the extension direction of the short axis side of the voice coil 22, and the third direction corresponds to the extension direction of the long axis side of the voice coil 22.

[0073] It should be understood that during the rotation of voice coil 22, it should always be within the magnetic field region, and the two voice coils 22 should remain synchronized.

[0074] Specifically, by changing the direction of the current in the voice coil 22, the swing direction of the voice coil 22 is changed, thereby driving the two diaphragms 21 to vibrate up and down in the first direction. The following describes the different positions of the diaphragms 21 corresponding to the three states of the voice coil 22 according to one embodiment:

[0075] Equilibrium position (please refer to) Figure 2 The voice coil 22 remains horizontal, and the two diaphragms 21 remain in their initial state.

[0076] At the first vibration position, the two voice coils 22 rotate in opposite directions at a certain angle, and the distance between the first and second ends of the transmission mechanism 23 becomes smaller than that at the equilibrium position, and both diaphragms 21 vibrate inward.

[0077] At the second vibration position, the two voice coils 22 rotate relative to each other at a certain angle, and the distance between the first and second ends of the transmission mechanism 23 becomes larger than that at the equilibrium position, and both diaphragms 21 vibrate outward.

[0078] In this embodiment, the center line of the voice coil 22 is coplanar with the rotation axis of the voice coil 22. Here, the center line of the voice coil 22 refers to the central axis of the voice coil 22. At this time, the voice coil 22 is subjected to more balanced forces in the magnetic field, which can effectively reduce the additional stress caused by eccentric oscillation. The oscillation amplitude of the voice coil 22 is easier to control. When the diaphragm 21 vibrates up and down, the oscillation angle of the voice coil 22 relative to the horizontal plane tends to be consistent.

[0079] Specifically, in the second direction, the sides of the two voice coils 22 that are close to each other are defined as the first side 221, and the sides of the two voice coils 22 that are far apart from each other are defined as the second side 222. The first side and the second side of the same voice coil 22 are respectively connected to two transmission mechanisms 23. Thus, when the voice coil 22 rotates, the two transmission mechanisms 23 are driven by upward and downward forces respectively, thereby having opposite motion tendencies in the first direction.

[0080] The magnetic circuit assembly 3 includes two magnetic groups arranged sequentially along the second direction. Each magnetic group includes a central magnetic part 31 and two side magnetic parts 32. The two side magnetic parts 32 are respectively disposed on opposite sides of the central magnetic part 31 along the second direction. The two side magnetic parts 32 and the central magnetic part 31 together define a magnetic gap.

[0081] Based on the rotational engagement of the voice coil 22, the shape of the central magnetic part 31 is not limited. In this embodiment, the central magnetic part 31 is set to an arc shape on both sides corresponding to the voice coil 22, thereby improving the utilization rate of the magnetic field. In other embodiments, the central magnetic part 31 can also be set as a bar magnet or a cylindrical magnet.

[0082] The voice coil 22 typically has two long axis sides and two short axis sides. Depending on the different requirements of the product size, in one embodiment, the two long axis sides of the voice coil 22 are located within two magnetic gaps. In this case, the extension direction of the long axis side of the voice coil 22 is consistent with the direction of the rotation axis of the voice coil 22, which can improve the energy transfer efficiency. That is, the first side 221 and the second side 222 are the long axis sides of the voice coil 22.

[0083] In another embodiment, the two short axis sides of the voice coil 22 are located within two magnetic gaps. In this case, the extension direction of the short axis sides of the voice coil 22 is consistent with the direction of the rotation axis of the voice coil 22, that is, the first side 221 and the second side 222 are the short axis sides of the voice coil 22.

[0084] In the first magnetization scheme, in each magnetic group, the central magnetic part 31 and the two side magnetic parts 32 are magnetized along the second direction, and the magnetization directions are the same. The magnetization directions of the central magnetic parts 31 of the two magnetic groups are opposite. At this time, the N pole of the central magnetic part 31 is opposite to the S pole of the side magnetic parts 32, and the S pole of the central magnetic part 31 is opposite to the N pole of the side magnetic parts 32, so that a uniform magnetic field with the same direction is formed in the magnetic gap. Therefore, when current is passed through the voice coil 22, the Ampere force on the two long axis sides of the voice coil 22 is in different directions, realizing the oscillation of the voice coil 22. At this time, the current direction of the two voice coils 22 is the same. Figure 16 With this magnetization method, the magnetic field line density on both sides is more balanced, and the voice coil 22 experiences more symmetrical forces in the magnetic field.

[0085] It should be noted that the central magnetic part 31 and the two side magnetic parts 32 in this solution are all permanent magnets. Compared with the conventional product solution of magnetizing along the vibration direction (axial magnetization) and setting a magnetic guide above the magnet, the technical solution of this invention is to magnetize perpendicular to the vibration direction (radial magnetization), which does not require setting a magnetic guide. Therefore, the thickness of the sound generating device can be further reduced, which is conducive to the design of a thinner and lighter device.

[0086] In the second magnetization scheme, in each magnetic group, the central magnetic part 31 and the two side magnetic parts 32 are magnetized along the second direction, and the magnetization directions are the same. The magnetization directions of the central magnetic parts 31 of the two magnetic groups are the same, and the adjacent side magnetic parts 32 in the two magnetic groups are either integrally arranged or separately arranged. At this time, the current directions of the two voice coils 22 are opposite. Please refer to... Figure 17 When the adjacent side magnetic parts 32 in the two magnetic groups are integrated or separate, the magnetic circuit assembly 3 can be fixed on the housing 1 first, and then the side magnetic parts 32 can be magnetized. This is because magnetization in a single direction will not cause the magnets to repel each other, making it easier to position them.

[0087] The side magnet 32 ​​located on the side of the voice coil 22 furthest from the other magnet group is defined as the first side magnet 321, and the side magnet 32 ​​located on the side of the voice coil 22 closest to the other magnet group is defined as the second side magnet 322. Please refer to... Figure 11 The central magnetic section 31 and the first side magnetic section 321 are both magnetized along the second direction, and the magnetization directions are the same. The second side magnetic section 322 includes a first side magnet 3221 and a second side magnet 3222 stacked along the first direction. The magnetization directions of the first side magnet 3221 and the second side magnet 3222 are both set at an angle to the second direction. The magnetic poles of the first side magnet 3221 and the second side magnet 3222 near the magnetic gap are opposite in polarity to the magnetic poles of the central magnetic section 31 near the second side magnetic section 322. The magnetization directions of the central magnetic sections 31 of the two magnetic groups are opposite. By setting the second side magnetic section 322 located between the two voice coils 22 as a separate unit, and setting the magnetization of the first side magnet 3221 and the second side magnet 3222 at a first fixed angle, it is intended that the magnetic field generated by the second side magnet 3222 can form a superposition and enhancement effect with the magnetic field generated by the first side magnet 3221 within the magnetic gap. When current flows through the voice coil 22, the conductor of the voice coil 22 in this combined magnetic field will be subjected to a greater Ampere force, which will give the voice coil 22 a greater driving force, thereby driving the diaphragm 21 to produce a greater amplitude vibration.

[0088] Based on the second magnetization scheme, the magnetization direction of the first side magnet 3221 and / or the second side magnet 3222 forms an angle of 0° to 80° with the second direction. In this embodiment, the magnetization direction of the first side magnet 3221 forms an angle of 60° with the second direction. Simultaneously, the first side magnet 3221 and the second side magnet 3222 are symmetrically arranged, with the magnetization direction of the second side magnet 3222 forming an angle of 120° with the magnetization direction of the first side magnet 3221. This arrangement allows the first side magnet 3221 to be magnetized along a direction forming a 60° angle with the second direction, while the second side magnet 3222 is magnetized along a direction forming a 120° angle with the magnetization direction of the first side magnet 3221. The magnetic fields generated by the two magnets within the magnetic gap can form a specific superposition effect. Of course, in other cases, the angle between the magnetization direction of the first side magnet 3221 and / or the second side magnet 3222 and the second direction can be 70°, 50°, 45°, 30°, etc., depending on specific requirements.

[0089] Furthermore, the side magnetic part 32 located on the side of the voice coil 22 away from the other magnetic group is the first side magnetic part 321, and the side magnetic part 32 located on the side of the voice coil 22 closer to the other magnetic group is the second side magnetic part 322. The first side magnetic part 321 and the second side magnetic part 322 are respectively provided with protrusions 324 on opposite sides along the first direction. This structure can enhance the magnetic field performance of the magnetic circuit. Specifically, the protrusions 324 can have a positive influence on the distribution of magnetic lines of force in the magnetic gap. By changing the local density and direction of the magnetic field, the magnetic field environment in which the voice coil 22 is located during vibration is optimized, thereby effectively improving the stability and strength of the Ampere force generated by the voice coil 22 when cutting magnetic lines of force. When an alternating current is passed through the voice coil 22 and it vibrates in a magnetic field, the presence of the protrusion 324 helps reduce magnetic field leakage, concentrates more magnetic flux in the effective working area of ​​the voice coil 22, thereby improving the energy conversion efficiency of the sound-generating device 100, ensuring that the diaphragm 21 can obtain a stronger and more uniform driving force, and ultimately improving the sound quality and output power of the sound-generating device 100. The area adjacent to the protrusion 324 forms a clearance groove 325, which is used to avoid the corresponding portion of the transmission mechanism 23. The location and size of the clearance groove 325 must be adapted to the movement trajectory of the transmission mechanism 23 to ensure that the transmission mechanism 23 can move smoothly within the clearance groove 325 during the reciprocating vibration of the diaphragm 21, avoiding mechanical interference with the side magnetic part 32.

[0090] Specifically, the first magnetic part 321 has a protrusion 324 on one side of one of the diaphragms 21, forming a clearance groove 325 that runs through the second direction. The second magnetic part 322 has a protrusion 324 on one side of the other diaphragm 21, forming a clearance groove 325 that runs through the second direction.

[0091] One of the first side magnet 3221 or the second side magnet 3222 can be set as a long bar magnet, and the other is composed of multiple block magnets. A clearance groove 325 is defined between two adjacent block magnets to simultaneously meet the requirements of magnetization difference and clearance.

[0092] The transmission mechanism 23 can be multiple rigid components that are rotatably connected to each other, or it can be a flexible component with a certain toughness, or it can be a structure in which rigid components and flexible components cooperate. The present invention does not limit this.

[0093] In this embodiment, the transmission mechanism 23 includes two linkage mechanisms arranged opposite to each other along a second direction, each linkage mechanism being connected to two voice coils 22. In each transmission mechanism 23, the two linkage mechanisms connected to the same voice coil 22 are respectively connected to the first side 221 and the second side 222 of the voice coil 22. The structural characteristics of the linkage mechanism enable the voice coil 22 to rotate into a large displacement with a small oscillation amplitude, thereby meeting the design requirements. The linkage mechanism consists of multiple mutually rotating links, and the number and arrangement of the links are not limited. Furthermore, the lengths of the multiple links can be set differently to accommodate different transmission ratio requirements.

[0094] For example, in the transmission mechanism 23 near one of the diaphragms 21, two linkage mechanisms are respectively connected to the first sides 221 of the two voice coils 22 that are close to each other. At this time, the two linkage mechanisms are in a close-to-each-other engagement state. In the other transmission mechanism 23, two linkage mechanisms are respectively connected to the second sides 222 of the two voice coils 22 that are far apart from each other. At this time, the two linkage mechanisms are in a far-away engagement state. When the corresponding two voice coils 22 rotate toward each other, both the upper and lower diaphragms 21 vibrate outwards.

[0095] Please refer to Figures 4 to 6 The linkage mechanism includes a first link 231, a second link 232, and a third link 233 connected in sequence. The first link 231 connects to the diaphragm 21, and the third link 233 connects to the voice coil 22. The second link 232 is connected to both the first link 231 and the third link 233 via a first flexible part 234. As a rigid-flexible coupling component, the first link 231 and the third link 233 are rigidly connected to the voice coil 22 and the diaphragm 21, maintaining good consistency. Flexible joints provide relative displacement between adjacent links. The first flexible part 234 can bend under force, opening and closing adjacent links and causing the diaphragm 21 to vibrate. This flexible transmission reduces deformation during movement and effectively reduces energy loss due to mechanical friction, improving transmission efficiency. The first flexible part 234 also reduces the precision requirements for the installation of components during assembly, facilitating sequential production assembly. The material of the first flexible part 234 can be silicone, rubber, cloth, thin metal sheet, or other flexible materials.

[0096] In this embodiment, the length of the second link 232 is greater than the length of the third link 233, which is greater than the length of the first link 231. The first link 231 is in contact with the diaphragm 21 as a whole, and the second link 232 and the third link 233 are set at an angle.

[0097] Furthermore, the third link 233 is stepped, thereby ensuring the height of the voice coil 22 within the magnetic gap.

[0098] In other embodiments, adjacent links in the linkage mechanism are connected by a rigid first rotating part. This rigid first rotating part has the characteristic of no parasitic displacement, ensuring that there is no delay in the transmission of displacement between multiple links. This rigid design provides excellent support, particularly helping to enhance the stability and response performance of the system in mid-to-high frequency vibration environments. The first rotating part can be configured as a hinge-like structure or a simple shaft-hole fit. Specifically, the first rotating part includes two bushings and a shaft. The shaft is rotatably installed in the two bushings to achieve a rotational connection between adjacent links; wherein, the two bushings are integrally formed with the opposing links. Taking the fit between the first link 231 and the second link 232 as an example, the ends of the first link 231 and the second link 232 near each other are integrally formed with bushings. After the first link 231 and the second link 232 are aligned, the two bushings between them should be spaced apart in a third direction, and the shaft passes through the two bushings to enable the first link 231 and the second link 232 to achieve a rigid rotational connection. It can be understood that at least one of the two bushings located between two adjacent connecting rods can be configured as a separate unit, consisting of bushing segments spaced apart along a third direction, in which case the other bushing can be located between the two bushing segments. Alternatively, both corresponding bushings can be configured as separate units, with them alternating along a third direction to provide a more stable connection.

[0099] Please refer to Figure 3In this embodiment, in each linkage mechanism, two first flexible parts 234 are distributed along a first direction, one near the diaphragm 21 and the other near the voice coil 22. The distance between the rotation centers of the two first flexible parts 234 is defined as L1, and the distance between the rotation center of the first flexible part 234 near the corresponding voice coil 22 and the rotation center of the voice coil 22 is defined as L2. When the vibrating assembly is in the equilibrium position, L1 = L2. Specifically, the rotation center of the first flexible part 234 between the first link 231 and the second link 232 is the first axis of rotation, the rotation center of the first flexible part 234 between the second link 232 and the third link 233 is the second axis of rotation, and the rotation axis of the voice coil 22 is the third axis of rotation. In the equilibrium position, the distance L1 between the first axis of rotation and the second axis of rotation is equal to the distance L2 between the second axis of rotation and the third axis of rotation, that is, the lever arms are equal. This reduces torque fluctuations during transmission. When the voice coil 22 is driven by a force in the magnetic field and rotates around the third shaft, the torque transmitted to the first shaft through the second link 232 and the torque transmitted to the second shaft can be better balanced.

[0100] In some embodiments, adjacent connecting rod ends are fixedly connected to the first flexible portion 234. For example, the rigid connecting rod and the first flexible portion 234 can be integrally connected by injection molding, or they can be achieved by embedding. Please refer to... Figure 6 In this embodiment, the linkage mechanism further includes a flexible pad 235. The first link 231, the second link 232, and the third link 233 are all fixedly connected to the flexible pad 235, so that the portion of the flexible pad 235 between the second link 232 and the first link 231 and the third link 233 forms a first flexible part 234. At this time, the flexible pad 235, as an integral structure, can be attached to multiple links. This connection method has better stability. The flexible pad 235 can be fixed to each link by heat pressing or adhesive bonding.

[0101] Furthermore, multiple second links 232 are provided, arranged at intervals along a third direction. This arrangement reduces the overall weight, and the gaps between adjacent second links 232 allow for more airflow within the structure, reducing resonance. Correspondingly, the third link 233 can have multiple extensions corresponding to the multiple second links 232 to meet the torque transmission design requirements.

[0102] In the two linkage mechanisms connecting the same voice coil 22, the rotation axes of the first linkage 231 and the second linkage 232 are set to coincide with the projection of the corresponding rotation axis of the voice coil 22 along the first direction. That is, the first and third rotation axes both fall on the a-axis. This setting can improve energy transmission efficiency, effectively avoid additional torque and motion interference generated during transmission, and improve the overall motion accuracy and stability of the sound generating device 100.

[0103] The third link 233 is fixedly connected to the major axis and / or minor axis of the voice coil 22. When the major axis of the voice coil 22 extends along a third direction, the third link 233 can be connected to the major axis of the voice coil 22, or it can be connected to both the major and minor axes of the voice coil 22 simultaneously. The two third links 233 correspondingly connected to the same voice coil 22 respectively connect to two opposite sides of different regions of the voice coil 22 along the first direction. Therefore, the structures of the two third links 233 can be different. For example, the upper third link 233 connects to the major axis of the voice coil 22, and the lower third link 233 connects to both the major axis and the two minor axes of the voice coil 22.

[0104] To ensure that the voice coil 22 can rotate stably around its axis of rotation under the influence of the magnetic field, please refer to... Figure 4 The sound-generating device 100 also includes two rotating engagement structures 24 corresponding to the two voice coils 22. Each rotating engagement structure 24 includes two first connecting members 241 and two second connecting members 242. The two second connecting members 242 are fixedly connected to the voice coils 22 on opposite sides along a third direction. The two first connecting members 241 connect the two second connecting members 242 and the housing 1. The engaging first connecting members 241 and second connecting members 242 can rotate relative to each other along an axis extending in a third direction. The rotation axis of the first connecting members 241 and second connecting members 242 is the rotation axis of the voice coils 22, thus ensuring the stability of the voice coils 22 during rotation.

[0105] This invention does not limit the cooperation form of the first connector 241 and the second connector 242. In some embodiments, please refer to... Figure 7 The first connector 241 and the second connector 242 are connected by a second flexible part 243. The material of the second flexible part 243 can be silicone, rubber, cloth, thin metal sheet, or other flexible materials. Based on the connection of the second flexible part 243, during the rotation of the voice coil 22, the first connector 241 and the second connector 242 rotate relative to each other, thereby causing the second flexible part 243 to twist. This provides the necessary flexible support for the rotation of the voice coil 22, and also provides a certain amount of rebound force.

[0106] Specifically, both the first connecting member 241 and the second connecting member 242 include a main body 2401 and a protrusion 2402. The protrusion 2402 of the second connecting member 242 connects to the middle of the second flexible part 243 and is located on the rotation axis of the voice coil 22. There are two protrusions 2402 of the second connecting member 242, which respectively connect to the two opposite sides of the second flexible part 243 along the second direction. That is, the two ends of the voice coil 22 are connected by the rigid second connecting member 242, the housing 1 is connected to the rigid first connecting member 241, the two protrusions 2402 of the second connecting member 242 serve as two fulcrums, and the protrusion 2402 on the first connecting member 241 serves as a fulcrum corresponding to the rotation center. The second flexible part 243 is connected to multiple protrusions 2402, so that under the action of the protrusions 2402 at different positions on both sides, its middle and two ends can be twisted to achieve a flexible bending effect.

[0107] In another embodiment, please refer to Figure 10 One of the second connecting member 242 and the first connecting member 241 is provided with a bushing portion 245, and the other is provided with a rotating shaft portion 244. The rotating shaft portion 244 is rotatably mounted inside the bushing portion 245. It should be understood that both the bushing portion 245 and the rotating shaft portion 244 extend along a third direction. This type of fit has a simple structure and good rotational stability, which can effectively reduce assembly difficulty and production costs. Furthermore, the rigid rotating shaft has the characteristic of no parasitic displacement, ensuring the accuracy of the transmission fit between the first connecting member 241 and the second connecting member 242.

[0108] Alternatively, a ball joint structure can be used to achieve the rotational engagement of the first connector 241 and the second connector 242. That is, one connector is provided with a ball head, and the other connector is provided with a ball socket that engages with the ball head. The ball head can rotate around a third-direction axis within the ball socket.

[0109] In some embodiments, the second connector 242 is stepped, such that the rotation axis of the voice coil 22 corresponds to the center line of the voice coil 22. Specifically, the main body 2401 of the second connector 242 is bent, thus having a plane arranged along a third direction and a vertical surface arranged along a first direction. The corresponding protrusion 2402 is connected to the vertical surface of the main body 2401 and is arranged close to the magnetic circuit assembly 3. The plane is in contact with the end face of the short axis of the voice coil 22 facing the diaphragm 21.

[0110] The rotational engagement structure 24 can be separately configured. At least one third link 233 of the linkage mechanism is connected to the long axis of the voice coil 22, thereby leaving at least one of the two short axis sides of the voice coil 22 along the first direction unused. The two second connecting members 242 of the rotational engagement structure 24 are distributed on both sides of the third link 233 along the third direction and are connected to the two unused short axis sides of the voice coil 22. Please refer to... Figures 8 to 9The two third links 233 of the two linkage mechanisms on the upper side are connected to the long axis of the voice coil, and the two second connectors 242 are connected to the upper end faces of the two short axis sides of the voice coil. The two third links 233 of the two linkage mechanisms on the lower side are connected to the corresponding long axis side and two short axis sides of the voice coil, forming a U-shaped structure.

[0111] Please combine Figure 5 The second connecting member 242 is partially connected to one of the transmission mechanisms 23. Specifically, the third link 233 of the two upper linkage mechanisms is connected to the two second connecting members 242 as a whole, forming a U-shaped structure. The second connecting member 242 and the third link 233 can be integrally formed, or they can be connected by welding, bonding, or other methods. This application does not limit this. The third link 233 of the lower linkage mechanism can be a U-shaped structure connected to both the long and short axis sides, or it can be a long strip structure connected only to the long axis side.

[0112] Axis b is the central axis perpendicular to the second direction (in combination with...) Figure 3 and Figure 11 The two transmission mechanisms 23 are symmetrically distributed along axis b, meaning they are mirror-symmetrical. This symmetrical distribution ensures a more balanced driving force on the diaphragm 21 during the rotation of the two voice coils 22. It also allows the horizontal components of the force generated by the two transmission mechanisms 23 during their movement to cancel each other out, effectively preventing vibration deviation or distortion of the diaphragm 21 caused by excessive force on one side. The two linkage mechanisms connecting the same voice coil 22 are rotationally symmetrical about the rotation axis of the voice coil 22. A single oscillation or rotation of the voice coil 22 synchronously drives the linkage structures on both sides to move towards each other; either both linkage mechanisms move towards the voice coil 22, or both linkage mechanisms move away from the voice coil 22.

[0113] Please refer to Figure 13 The housing includes a first housing 11 and two second housings 12 respectively connected to opposite sides of the first housing 11 in a first direction. Ventilation holes 121 are provided on at least the side surface of the first housing 11 to facilitate airflow exchange between the sound-generating device 100 and the outside environment, resulting in more balanced air pressure on both sides of the diaphragm 21 and preventing air pressure buildup that could obstruct or distort the movement of the diaphragm 21. The two diaphragms 21 are respectively connected to the two second housings 12; the magnetic circuit assembly 3 is connected to the first housing 11. Specifically, the first housing 11 is a frame structure, open on both opposite sides in the first direction. The two diaphragms 21 are connected to the ends of the two second housings 12 furthest from each other, and the first housing 11 serves as both a connector and a support.

[0114] Both the first housing 11 and the second housing 12 are made of metal and can be connected by welding to improve structural strength and help reduce the overall size of the sound-generating device. At the same time, the metal material can improve heat dissipation efficiency.

[0115] In some embodiments, ventilation holes 121 are provided on the side surfaces of the first housing 11 and one of the second housings 12.

[0116] Furthermore, the first housing 11 includes a base plate and a side enclosure surrounding the base plate. Ventilation holes 121 are provided on the side enclosure. A hollow portion 111 is formed in the center of the base plate to allow one of the transmission mechanisms 23 to pass through. The magnetic circuit assembly 3 is fixed to the base plate. Simultaneously, to ensure that the centerline of the central magnet 31 corresponds to the rotation axis of the voice coil 22, a boss 112 is provided on the base plate for mounting the central magnet 31, thereby limiting the relative height between the voice coil 22 and the central magnet 31.

[0117] In addition, the two ends of the voice coil 22 are connected to the support 5 to achieve electrical conduction. Since the voice coil 22 has a small displacement in this solution, the support 5 only needs a short length to meet the requirements. It can be connected by the lead wire of the voice coil 22 to replace the part that originally needed to be connected by the support 5. This setting reduces the risk of the support 5 breaking.

[0118] In one embodiment, please refer to Figure 13 and Figure 14 The support piece 5 is located outside the voice coil 22. The first housing 11 has grooves on opposite sides along the third direction to accommodate the support piece 5 and adapt to its size. At this time, multiple vent holes 121 are provided on the walls of opposite sides along the second direction of the first housing 11. One of the second housings 12 has two protrusions corresponding to two grooves so that it can be embedded in the two grooves to ensure a tight fit between the first housing 11 and the second housing 12. At this time, the second housing 12 has multiple vent holes 121 on its two sides along the third direction so that it can form a surrounding air circulation effect after cooperating with the first housing 11.

[0119] The diaphragm 21 includes a vibrating plate and a folded ring disposed around the vibrating plate. The transmission mechanism 23 is connected to the vibrating plate. The surface of the vibrating plate is provided with a recess to increase stiffness and extend high-frequency vibration.

[0120] The present invention also proposes a sound-generating module, which includes a housing 4 and a sound-generating device 100. The specific structure of the sound-generating device 100 is as described in the above embodiments. Since the sound-generating module adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0121] Please refer to Figure 15The housing 1 has a vent hole 121 on its peripheral side. The sound-generating module also includes a shell 4, which includes a main body 41 and a sound-emitting part 42 located on the side of the main body 41. The main body 41 is located on one side of the sound-generating device 100. The main body 41 is connected to the vibration assembly 2 and forms two front cavities with the two diaphragms 21. The sound-emitting part 42 connects to the two front cavities. A through hole 411 is provided on the side surface of the main body 41. The through hole 411 communicates with the vent hole 121 so that the vent hole 121 communicates with the external space of the shell 4.

[0122] In this embodiment, the main body 41 covers the outside of the sound-generating device to form a front shell and a rear shell. The front shell and the rear shell correspond to two diaphragms 21 respectively. A through hole 411 is formed between the front shell and the rear shell. A part of the shell 1 can be exposed at the through hole 411, so that the vent 121 is connected to the external space of the sound-generating module. On the one hand, the sound waves of the two diaphragms 21 radiate outward through the sound outlet formed by the sound outlet 42, simplifying the overall design. On the other hand, the inner cavity of the shell 1 can be directly connected to the cavity of the electronic device, using the rear cavity of the whole device as a sound cavity, improving sensitivity and enhancing low-frequency sound effects.

[0123] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A sound-generating device, characterized in that, include case; A vibration assembly, comprising two diaphragms and two voice coils, wherein the two diaphragms are respectively connected to opposite ends of the housing along a first direction, and the two voice coils are disposed between the two diaphragms and arranged along a second direction, and the two voice coils have a first side that is close to each other and a second side that is far from each other; A magnetic circuit assembly, connected to the housing and located between the two diaphragms, has two magnetic gaps spaced apart along a second direction to accommodate the two voice coils, allowing both voice coils to oscillate along a third-direction axis under magnetic force; and, Two transmission mechanisms are located on opposite sides of the two voice coils along a first direction. Each transmission mechanism has a first end and a second end arranged opposite to each other along the first direction. The first end is connected to the diaphragm, and the second end is connected to the voice coil. The transmission mechanism can convert the rotational motion of the voice coil into the linear motion of the diaphragm along the first direction. The two transmission mechanisms are respectively connected to the first side and the second side of the two voice coils. The two voice coils drive the two diaphragms to vibrate in opposite directions along the first direction. The first direction, the second direction, and the third direction are perpendicular to each other.

2. The sound-generating device as described in claim 1, characterized in that, The first side and the second side are the major axis sides of the voice coil; and / or, The two voice coils rotate in opposite directions, and the two transmission mechanisms move in opposite directions; and / or, The centerline of the voice coil is coplanar with the axis of rotation of the voice coil.

3. The sound-generating device as described in claim 1, characterized in that, The magnetic circuit assembly includes two magnetic groups arranged sequentially along a second direction. Each magnetic group includes a central magnetic part and two side magnetic parts. The two side magnetic parts are located on opposite sides of the central magnetic part along the second direction. The two side magnetic parts and the central magnetic part together define a magnetic gap.

4. The sound-generating device as described in claim 3, characterized in that, In each of the magnetic groups, the central magnetic portion and the two side magnetic portions are all magnetized along the second direction, and the magnetization directions are the same; the magnetization directions of the central magnetic portions of the two magnetic groups are opposite; or... In each of the magnetic groups, the central magnetic part and the two side magnetic parts are magnetized along the second direction and the magnetization direction is the same. The magnetization direction of the central magnetic part of the two magnetic groups is the same. The side magnetic parts that are close to each other in the two magnetic groups are either integrally arranged or separately arranged.

5. The sound-generating device as described in claim 3, characterized in that, Of the two side magnetic portions, the side magnetic portion located on the side of the voice coil away from the other magnetic group is the first side magnetic portion, and the side magnetic portion located on the side of the voice coil closer to the other magnetic group is the second side magnetic portion. In each magnetic group, the central magnetic portion and the first side magnetic portion are both magnetized along the second direction, and the magnetization directions are the same. The second side magnetic portion includes a first side magnet and a second side magnet stacked along the first direction. The magnetization directions of the first side magnet and the second side magnet are both set at an angle to the second direction. The magnetic poles of the first side magnet and the second side magnet near the magnetic gap are opposite in polarity to the magnetic poles of the central magnetic portion near the second side magnetic portion. The magnetization directions of the central magnetic portions of the two magnetic groups are opposite.

6. The sound-generating device as described in claim 5, characterized in that, The angle between the magnetization direction of the first side magnet and the second direction is 0~80°; and / or, The angle between the magnetization direction of the second side magnet and the second direction is 0~80°; and / or, One of the first side magnet and the second side magnet has a notch to accommodate the corresponding transmission mechanism.

7. The sound-generating device as described in claim 3, characterized in that, The two side magnetic portions include a first side magnetic portion located on the side of the voice coil away from the other magnetic group, and a second side magnetic portion located on the side of the voice coil closer to the other magnetic group. The first side magnetic portion and the second side magnetic portion are respectively provided with protrusions on opposite sides along the first direction. The areas of the protrusions adjacent to each other form a clearance groove, which is used to avoid the corresponding part of the transmission mechanism.

8. The sound-generating device as claimed in claim 1, characterized in that, Each of the transmission mechanisms includes two linkage mechanisms arranged opposite to each other along the second direction, and the two linkage mechanisms are respectively connected to the two voice coils; In the two transmission mechanisms, the two linkage mechanisms connecting the same voice coil are respectively connected to the first side and the second side of the voice coil.

9. The sound-generating device as described in claim 8, characterized in that, Each of the linkage mechanisms includes a first linkage, a second linkage, and a third linkage connected in sequence. The first linkage is connected to the diaphragm, the third linkage is connected to the voice coil, and the second linkage is connected to the first linkage and the third linkage through a first flexible part.

10. The sound-generating device as claimed in claim 9, characterized in that, The linkage mechanism further includes a flexible pad, wherein the first link, the second link, and the third link are all fixedly connected to the flexible pad, such that the portion of the flexible pad located between the second link and the first and third links forms the first flexible portion; and / or, Multiple second links are provided, and the multiple second links are arranged at intervals along a third direction; and / or, In each of the aforementioned linkage mechanisms, the rotation axes of the first link and the second link rotating relative to each other are coplanar with the projections of the corresponding voice coil's rotation axis along the first direction; and / or, In each of the linkage mechanisms, the distance between the rotation centers of the two first flexible parts is L1, and the distance between the rotation center of the first flexible part closest to the corresponding voice coil and the rotation center of the voice coil is L2. When the vibration assembly is in the equilibrium position, L1=L2.

11. The sound-generating device as claimed in claim 8, characterized in that, The sound-generating device further includes two rotating engagement structures that cooperate with the two voice coils. Each rotating engagement structure includes two first connectors and two second connectors. The two second connectors are respectively connected to the two sides of the voice coils along a third direction. The two first connectors are connected to the two second connectors and the housing. The cooperating first connectors and second connectors are able to rotate relative to each other along an axis extending in a third direction.

12. The sound-generating device as claimed in claim 11, characterized in that, The first and second connectors, which cooperate with each other, are connected via a second flexible portion. Both the first and second connectors include a main body and a protrusion. The main body of the first connector is connected to the housing. The protrusion of the first connector connects to the middle of the second flexible portion and is located on the corresponding rotation axis of the voice coil. The second connector has two protrusions, respectively connecting to opposite sides of the second flexible portion along a third direction. The main body of the second connector is connected to the linkage mechanism; and / or, The second connector is stepped; and / or, The second connector and one of the linkage mechanisms are connected as a single unit.

13. The sound-generating device as claimed in claim 1, characterized in that, The housing includes a first housing and two second housings respectively connected to the first housing on opposite sides in a first direction, and at least one ventilation hole is provided on the side surface of the first housing; The two diaphragms are respectively connected to the two second housings; The magnetic circuit assembly is connected to the first housing.

14. The sound-generating device as claimed in claim 13, characterized in that, The ventilation holes are provided on the side surfaces of the first housing and one of the second housings; and / or, The first housing includes a base plate and a side enclosure surrounding the base plate. The side enclosure is provided with the ventilation holes. A hollow portion is formed in the middle of the base plate to allow one of the transmission mechanisms to pass through. The magnetic circuit assembly is fixed to the base plate.

15. A sound-generating module, characterized in that, The device includes a housing and a sound-generating device as described in any one of claims 1-14, wherein the peripheral side of the housing is provided with a vent hole; The housing includes a main body and a sound-emitting part located on the side of the main body. The main body covers the two opposite sides of the sound-generating device along a first direction. The main body is connected to the vibration assembly and forms two front cavities between itself and the two diaphragms. The sound-emitting part communicates with the two front cavities. A through hole is provided on the side surface of the main body. The through hole communicates with the vent hole so that the vent hole communicates with the external space of the housing.

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