Sound production device and sound production module

Abstract

This invention discloses a sound-generating device and a sound-generating module, relating to the field of loudspeaker technology. The sound-generating device includes a housing, a magnetic circuit assembly, a vibration assembly, and two connecting structures. The magnetic circuit assembly has two magnetic gaps spaced apart along a second direction. The vibration assembly includes a diaphragm and two voice coils, each located within one of the two magnetic gaps. Under magnetic force, both voice coils can oscillate along an axis extending in a third direction. The connecting structures include multiple connecting rods rotatably connected in sequence. Adjacent connecting rods are connected by a first rotating part, which is made of a rigid material. When the voice coils rotate, they can drive the connecting rods to oscillate, thereby converting the rotational drive of the voice coils into a linear drive along the first direction. The voice coils only need a small oscillation amplitude to drive the diaphragm to achieve a large vibration displacement. The rigid first rotating part has the characteristic of no parasitic displacement, ensuring that there is no delay in the displacement transmission process of the multiple connecting rods.

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 provide a sound-generating device and a sound-generating module that can achieve a large displacement amplitude of the loudspeaker without increasing the thickness of the product.

[0004] To achieve the above objectives, the present invention provides a sound-generating device, the sound-generating device comprising: case; A magnetic circuit assembly is connected to one end of the housing along a first direction, and the magnetic circuit assembly has two magnetic gaps spaced apart along a second direction; A vibration assembly, comprising a diaphragm and two voice coils, the diaphragm being connected to the other end of the housing along a first direction, the two voice coils being respectively located within two magnetic gaps, and both voice coils being able to oscillate along a third-direction axis under the action of magnetic force; and, Two connection structures are provided for connecting the two voice coils to the diaphragm respectively. Each connection structure has a first end and a second end arranged opposite to each other along a first direction. The first end is connected to the diaphragm and the second end is connected to the voice coil. The connection structure includes a plurality of connecting rods that are rotatably connected in sequence. Two adjacent connecting rods are connected by a first rotating part. The first rotating part is made of a rigid material. When the voice coil rotates, it can drive each of the connecting rods to swing, thereby converting the rotation drive of the voice coil into a linear drive along a first direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0005] In one embodiment, the major axis of the voice coil extends along the third direction; the major axis sides of the two voice coils that are close to each other are defined as the first major axis sides, and the major axis sides of the two voice coils that are far apart are defined as the second major axis sides; the second ends of the two connecting structures are respectively connected to the two first major axis sides or respectively connected to the two second major axis sides; the rotation directions of the two voice coils are opposite; and / or, The centerline of the voice coil is coplanar with the axis of rotation of the voice coil.

[0006] 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 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.

[0007] 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, 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.

[0008] 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.

[0009] In one embodiment, the angle between the magnetization direction of the first side magnet and the second direction is 0° to 80°; and / or, The angle between the magnetization direction of the second magnet and the second direction is 0~80°.

[0010] In one embodiment, the two side magnets include a first side magnet located on the side of the voice coil away from the other magnet group, and a second side magnet located on the side of the voice coil closer to the other magnet group. The first side magnet or the second side magnet has a protrusion on the side facing the diaphragm, and the area adjacent to the protrusion forms a clearance groove, which is used to avoid a part of the connection structure.

[0011] In one embodiment, the plurality of links include a first link, a second link, and a third link. The first link is connected to the diaphragm, the third link is connected to the voice coil, and the second link is connected to the first link and the third link through the first rotating part.

[0012] In one embodiment, multiple second connecting rods are provided, and the multiple second connecting rods are arranged at intervals along a third direction. Each second connecting rod is connected to the first connecting rod and the third connecting rod through the first rotating part; and / or, The first rotating part includes two first bushings and one first shaft. The first shaft is rotatably mounted into the two first bushings to achieve a rotatable connection between two adjacent connecting rods; wherein, the two first bushings are integrally formed with the opposing connecting rods; and / or, The rotation axes of the first connecting rod and the second connecting rod relative to each other are arranged to coincide with the projection of the corresponding rotation axis of the voice coil along the first direction; and / or, The distance between the rotation centers of the two first rotating parts is L1, and the distance between the rotation center of the first rotating part closest to the corresponding voice coil and the rotation center of the voice coil is L2. When the vibrating assembly is in the equilibrium position, L1=L2.

[0013] In one embodiment, the sound-generating device further includes two rotating engagement structures corresponding to the two voice coils. Each rotating engagement structure includes two first connectors and two second connectors. The two second connectors are fixedly connected to the two opposite sides of the voice coils along a third direction. The two first connectors are connected to the second connectors through a second rotating part and are fixedly connected to the housing.

[0014] In one embodiment, one of the second connector and the first connector is provided with a second bushing, and the other is provided with a second shaft. The second shaft is rotatably mounted inside the second bushing, and the second bushing and the second shaft cooperate to form the second rotating part; and / or, The third connecting rod and the second connecting member are integrally formed.

[0015] In one embodiment, the housing includes a first housing and a second housing disposed along the first direction, the diaphragm is connected to the first housing, and the magnetic circuit assembly is connected to the second housing; a rear cavity is formed between the diaphragm and the second housing, and a vent hole communicating with the rear cavity is provided on the side surface of the second housing or the first housing; and / or, The side surface of the housing has a through hole, and part of the magnetic circuit assembly is disposed in the through hole.

[0016] The present invention also proposes a sound-generating module, including a housing and a sound-generating device, wherein the sound-generating device includes: case; A magnetic circuit assembly is connected to one end of the housing along a first direction, and the magnetic circuit assembly has two magnetic gaps spaced apart along a second direction; A vibration assembly, comprising a diaphragm and two voice coils, the diaphragm being connected to the other end of the housing along a first direction, the two voice coils being respectively located within two magnetic gaps, and both voice coils being able to oscillate along a third-direction axis under the action of magnetic force; and, Two connection structures are provided to connect the two voice coils to the diaphragm respectively. Each connection structure includes a plurality of connecting rods that are rotatably connected in sequence. Two adjacent connecting rods are connected by a first rotating part, which is made of a rigid material. When the voice coil rotates, it can drive each of the connecting rods to swing, thereby converting the rotation drive of the voice coil into a linear drive along a first direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other. The peripheral side of the housing is provided with vent holes; The housing includes a main body and a sound-emitting part located on the side of the main body. The main body is located on one side of the sound-generating device. The main body is connected to the vibration assembly and forms a front cavity with the diaphragm. The sound-emitting part communicates with the front cavity.

[0017] In the technical solution of this invention, by rationally designing the magnetic field distribution of the magnetic circuit components, the voice coil, when energized, can rotate along a third-direction axis under magnetic force. When the voice coil rotates, it applies a force along a first direction to the connecting rods connected to it, causing multiple connecting rods to swing accordingly. This changes the total height of the multiple connecting rods in the first direction, thus amplifying the displacement. The voice coil only needs a small swing amplitude to drive the diaphragm to achieve a large vibration displacement. The combination of two voice coils and two connecting structures provides a stable tensile force to the diaphragm, while simultaneously canceling out the horizontal force components generated during the movement of the two connecting structures, thereby ensuring stable vibration of the diaphragm in the first direction. The rigid first rotating part has the characteristic of no parasitic displacement, ensuring that there is no delay in the displacement transmission process of multiple connecting rods. 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. Attached Figure Description

[0018] 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.

[0019] Figure 1 An exploded view of an embodiment of the sound-generating device provided by the present invention; Figure 2 for Figure 1 A cross-sectional schematic diagram of the equilibrium state of the vibration component; Figure 3 for Figure 1 A schematic diagram of the connection between the central connecting structure and the rotating fit structure and the voice coil; Figure 4 for Figure 1 A schematic diagram of an embodiment of the connection structure; Figure 5 for Figure 4 Cross-sectional schematic diagram of the intermediate connection structure; Figure 6 for Figure 4 An exploded view of the intermediate connection structure; Figure 7 for Figure 3 Exploded view of the rotating fit structure; Figure 8 for Figure 2 A partial schematic diagram of the vibration assembly; Figure 9 for Figure 1 A schematic diagram of the magnetization scheme for the central magnetic circuit component; Figure 10 for Figure 1 Schematic diagram of the middle magnetic circuit assembly; Figure 11 for Figure 1 A schematic diagram showing the interaction between the sound-generating device and the outer casing; Figure 12 for Figure 11 An exploded view of the inner and outer shells; Figure 13 A simulation diagram of the magnetic field effect of the first magnetization scheme of the sound-generating device provided by the present invention. Figure 14 The magnetic field simulation diagram shows the effect of the second magnetization scheme of the sound-generating device provided by the present invention.

[0020] Explanation of icon numbers: 100. Sound-generating device; 1. Housing; 11. First housing; 12. Second housing; 121. Vent; 2. Vibration assembly; 21. Diaphragm; 22. Voice coil; 221. First long shaft side; 222. Second long shaft side; 23. Connecting structure; 231. First connecting rod; 232. Second connecting rod; 233. Third connecting rod; 234. First rotating part; 2341. First bushing; 2342. First shaft; 24. Rotating fit structure; 241. First connector; 242. Second connector; 240. Second rotating part; 243. Second bushing; 244. Second shaft; 3. Magnetic circuit assembly; 31. Central magnetic part; 32. Side magnetic part; 321. First side magnetic part; 322. Second side magnetic part; 3221. First side magnet; 3222. Second side magnet; 323. Protrusion; 324. Clearance groove; 4. Outer shell; 41. Main body; 42. Sound outlet part; 5. Support plate.

[0021] 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

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] This invention proposes a sound-generating device that converts the oscillating motion of the voice coil into the up-and-down vibration of the diaphragm, thereby achieving a large displacement amplitude of the loudspeaker without increasing the product thickness.

[0027] Please refer to Figures 1 to 2 and Figure 6 The sound-generating device 100 includes a housing 1, a magnetic circuit assembly 3, a vibration assembly 2, and two connecting structures 23. The magnetic circuit assembly 3 is connected to one end of the housing 1 along a first direction and has two magnetic gaps spaced apart along a second direction. The vibration assembly 2 includes a diaphragm 21 and two voice coils 22. The diaphragm 21 is connected to the other end of the housing 1 along the first direction, and the two voice coils 22 are respectively located in the two magnetic gaps. Under the action of magnetic force, both voice coils 22 can swing along an axis extending in a third direction. The two connecting structures 23 are used to connect the two voice coils 22 to the diaphragm 21 respectively. Each connecting structure 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 connecting structure 23 includes a plurality of connecting rods that are rotatably connected in sequence. Two adjacent connecting rods are connected by a first rotating part 234, which is made of a rigid material. When the voice coil 22 rotates, it can drive each connecting rod to swing, thereby converting the rotational drive of the voice coil 22 into a linear drive along the first direction.

[0028] In the technical solution of this invention, by rationally designing the magnetic field distribution of the magnetic circuit assembly 3, the voice coil 22 can rotate along a third-direction axis under the influence of magnetic force after being energized. When the voice coil 22 rotates, it can apply a force along the first direction to the connecting rods connected to the voice coil 22, causing multiple connecting rods to swing accordingly, thus changing the total height of the multiple connecting rods in the first direction. Therefore, it can play a displacement amplification role. The voice coil 22 only needs a small swing amplitude to drive the diaphragm 21 to achieve a large vibration displacement. The cooperation between the two voice coils 22 and the two connecting structures 23 can provide a stable pulling force for the diaphragm 21, while also allowing the horizontal component force generated during the movement of the two connecting structures 23 to cancel each other out, thereby ensuring the stable vibration of the diaphragm 21 in the first direction. The rigid first rotating part 234 has the characteristic of no parasitic displacement, ensuring that there is no delay in the displacement transmission of multiple connecting rods. This rigid design provides excellent support effect, which is particularly helpful in enhancing the stability and response performance of the system in mid-to-high frequency vibration environments.

[0029] 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.

[0030] 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.

[0031] 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 diaphragm 21 to vibrate up and down in the first direction. The following describes the different positions of the diaphragm 21 corresponding to the three states of the voice coil 22 according to one embodiment: Equilibrium position (please refer to) Figure 2 The voice coil 22 remains horizontal, and the diaphragm 21 remains in its initial state. In the lower 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 connecting structure 23 becomes smaller than in the equilibrium position, causing the diaphragm 21 to vibrate downwards. In the upward 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 connecting structure 23 becomes larger than in the equilibrium state, causing the diaphragm 21 to vibrate upward.

[0032] The relative rotational connection of the multi-link makes the connecting structure 23 as a whole a linkage mechanism. Depending on the different forms of the linkage mechanism, in some embodiments, the two voice coils 22 rotate in opposite directions. At this time, the two voice coils 22 can swing in opposite or opposite directions along a third-direction extended axis.

[0033] 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.

[0034] The major axis of the voice coil 22 extends in a third direction. The major axis sides of the two voice coils 22 that are close to each other are defined as the first major axis side 221, and the major axis sides of the two voice coils 22 that are far apart are defined as the second major axis side 222. The second ends of the two connecting structures 23 are connected to either the two first major axis sides 221 or the two second major axis sides 222, respectively. In this case, the rotation directions of the two voice coils 22 are opposite, driving the two connecting structures 23 synchronously to drive the diaphragm 21 with the same displacement. This configuration ensures that the rotation axis of the voice coil 22 is aligned with the extension direction of its major axis side, thereby improving energy transfer efficiency.

[0035] For example, taking the second direction as left and right as an example, please combine... Figure 2 The first long axis side 221 and the second long axis side 222 of the two voice coils 22 on the left and right sides are symmetrically arranged, that is, the two second long axis sides 222 are connected to each other. When the two voice coils 22 rotate toward each other, the diaphragm 21 vibrates upward.

[0036] For example, the two connecting structures 23 are located on the sides of the two voice coils 22 that are far apart from each other, that is, they are connected to the two first long axis sides 221. Accordingly, when the two voice coils 22 rotate toward each other, the diaphragm 21 vibrates downward.

[0037] Axis b is the central axis of the sound-generating device perpendicular to the second direction (in combination with...) Figure 8The two connecting structures 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 forces generated by the two connecting structures 23 during their movement to cancel each other out, effectively preventing diaphragm 21 vibration shift or distortion caused by excessive force on one side. Furthermore, regardless of whether the connecting structure 23 is located near or far from the voice coil 22, its connection point with the voice coil 22 is within the effective lever arm of the voice coil 22's vibration. This allows the rotation of the voice coil 22 to be efficiently converted into vibrational energy of the diaphragm 21, and more effectively cancels out the horizontal components of the forces generated by the connecting structure 23.

[0038] 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.

[0039] 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. At this time, 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. Based on this rotational fit relationship, the connecting structure 23 is preferentially connected to the long axis side of the voice coil 22.

[0040] 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 13 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.

[0041] 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.

[0042] 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 14 When the adjacent side magnetic parts 32 in the two magnetic groups are integrated or separate, the magnetic circuit assembly 3 can be fixed to the housing 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.

[0043] 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 9 In each magnetic assembly, 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 assemblies 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.

[0044] 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.

[0045] For further details, please refer to Figure 1 and Figure 10 Of the two side magnetic sections 32, the side magnetic section 32 located on the side of the voice coil 22 away from the other magnetic group is the first side magnetic section 321, and the side magnetic section 32 located on the side of the voice coil 22 closer to the other magnetic group is the second side magnetic section 322. The first side magnetic section 321 or the second side magnetic section 322 has a protrusion 323 protruding on the side facing the diaphragm 21. This structure can enhance the magnetic field performance of the magnetic circuit. Specifically, the protrusion 323 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 323 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 323 forms a clearance groove 324, which is used to avoid a portion of the connecting structure 23. By defining a space between two protrusions 323, the movement path of the connecting structure 23 can be avoided. The location and size of the clearance groove 324 must be adapted to the movement trajectory of the connecting structure 23 to ensure that the connecting structure 23 can move smoothly within the clearance groove 324 during the reciprocating vibration of the diaphragm 21, avoiding mechanical interference with the side magnet 32.

[0046] In the first embodiment, the connecting structure 23 is connected to the second long axis edge 222 of the two voice coils 22. The projection of the movement trajectory of the connecting structure 23 falls on the first side magnetic part 321. Therefore, a protrusion 323 and a relief groove 324 are formed on the first side magnetic part 321 for partial accommodation of the connecting structure 23.

[0047] In the second embodiment, the connecting structure 23 is connected to the first long axis side 221 of the two voice coils 22. The projection of the movement trajectory of the connecting structure 23 falls on the second side magnetic part 322. Therefore, a protrusion 323 and a relief groove 324 are formed on the second side magnetic part 322 for partial accommodation of the connecting structure 23.

[0048] 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.

[0049] The number and arrangement of the connecting rods are not limited. In this embodiment, please refer to... Figures 4 to 5 The multiple links include a first link 231, a second link 232 and a third link 233. The first link 231 is connected to the diaphragm 21, the third link 233 is connected to the voice coil 22, and the second link 232 is connected to the first link 231 and the third link 233 through a first rotating part 234.

[0050] The first rotating part 234 can be configured as a hinge-like structure or a simple shaft-hole fit. Specifically, the first rotating part 234 includes two first bushings 2341 and one first shaft 2342. The first shaft 2342 is rotatably mounted in the two first bushings 2341 to achieve a rotational connection between two adjacent connecting rods; wherein, the two first bushings 2341 are integrally formed with the corresponding connecting rods. Taking the cooperation between the first connecting rod 231 and the second connecting rod 232 as an example, the ends of the first connecting rod 231 and the second connecting rod 232 near each other are integrally formed with first bushings 2341. After the first connecting rod 231 and the second connecting rod 232 are aligned, the two first bushings 2341 located between them should be spaced apart in a third direction, and the first shaft 2342 passes through the two first bushings 2341 to enable the first connecting rod 231 and the second connecting rod 232 to achieve a rigid rotational connection. It can be understood that at least one of the two first bushings 2341 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 first bushing 2341 can be located between the two bushing segments. Alternatively, both corresponding first bushings 2341 can be configured as separate units, with them alternately arranged along a third direction, providing a more stable connection effect.

[0051] Furthermore, the third link 233 is stepped, thereby ensuring the height of the voice coil 22 within the magnetic gap.

[0052] Please refer to Figure 8 In this embodiment, in a single linkage structure, two first rotating 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 rotating parts 234 is defined as L1, and the distance between the rotation center of the first rotating 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 equilibrium, L1 = L2. Specifically, the first shaft 2342 between the first link 231 and the second link 232 is the first rotating shaft, the first shaft 2342 between the second link 232 and the third link 233 is the second rotating shaft, and the rotation axis of the voice coil 22 is the third rotating shaft. In equilibrium, the distance L1 between the first rotating shaft and the second rotating shaft is equal to the distance L2 between the second rotating shaft and the third rotating shaft, 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.

[0053] Furthermore, multiple second connecting rods 232 are provided, arranged at intervals along a third direction. Each second connecting rod 232 is connected to the first connecting rod 231 and the third connecting rod 233 via a first rotating part 234. This arrangement reduces the overall weight, and the gaps between adjacent second connecting rods 232 allow for more airflow within the structure, reducing resonance. Correspondingly, the third connecting rod 233 can have multiple extensions corresponding to the multiple second connecting rods 232 to meet the torque transmission design requirements.

[0054] The rotation axis of the first rotating part 234 between the first connecting rod 231 and the second connecting rod 232 is set to coincide with the projection of the rotation axis of the corresponding voice coil 22 along the first direction. That is, both the first rotating shaft and the third rotating shaft 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.

[0055] 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 the third link 233 can be connected to both the major and minor axes of the voice coil 22 simultaneously.

[0056] The lengths of the multiple links are set differently to accommodate different transmission ratio requirements. 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, and the second link 232 and the third link 233 are set at an angle.

[0057] 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 3 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 first connecting members 241 are fixedly connected to the housing 1, and the two second connecting members 242 are fixedly connected to the opposite sides of the voice coils 22 along a third direction. The corresponding first connecting members 241 and second connecting members 242 are connected by a second rotating part 240, allowing them to rotate relative to each other along an axis extending in a third direction. This arrangement provides stable support and guidance for the rotation of the voice coils 22, effectively limiting unnecessary displacement of the voice coils 22 in directions other than rotation around their rotation axis, and further ensuring the smoothness and accuracy of the rotation of the voice coils 22 when driven by force in a magnetic field.

[0058] The form of rotational engagement between the first connecting member 241 and the second connecting member 242 is not limited. In some embodiments, one of the second connecting member 242 and the first connecting member 241 is provided with a second bushing 243, and the other is provided with a second shaft 244. The second shaft 244 is rotatably mounted inside the second bushing 243, and the second bushing 243 and the second shaft 244 cooperate to form a second rotating part 240. It should be understood that both the second bushing 243 and the second shaft 244 extend along a third direction. This engagement form has a simple structure and good rotational stability, which can effectively reduce assembly difficulty and production costs. Furthermore, the rigid second rotating part 240 has the characteristic of no parasitic displacement, ensuring the accuracy of the transmission engagement between the first connecting member 241 and the second connecting member 242.

[0059] In other embodiments, a ball joint structure can also 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.

[0060] Rotational fit structure 24 can be set separately; please refer to [the relevant documentation]. Figure 7 The third connecting rod 233 is connected to the long axis of the voice coil 22. The two second connecting parts 242 of the rotating fit structure 24 are distributed on both sides of the third connecting rod 233 along the third direction and are connected to the two short axis of the voice coil 22. The second connecting parts 242 and the third connecting rod 233 can be connected by welding, bonding or other methods.

[0061] Please combine Figure 6 The connecting rod connected to the voice coil 22 is integrated with the second connecting member 242. That is, the third connecting rod 233 is integrated with the two second connecting members 242, forming a U-shaped structure. The second connecting member 242 and the third connecting rod 233 can be integrally formed, and this application does not limit this.

[0062] 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 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 second bushing 243 is connected to the vertical surface 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.

[0063] Please combine Figure 1 The housing 1 includes a first housing 11 and a second housing 12 arranged along a first direction. A diaphragm 21 is connected to the first housing 11, and a magnetic circuit assembly 3 is connected to the second housing 12. A rear cavity is formed between the diaphragm 21 and the second housing 12. A vent hole 121 communicating with the rear cavity is provided on the side surface of the second housing 12 or the first housing 11. Specifically, the first housing 11 is a frame structure with open sides on opposite sides along the first direction. The second housing 12 is open on one side facing the diaphragm 21, and a base plate is formed on the other side. The magnetic circuit assembly 3 is disposed on the base plate. When a rotating fit structure 24 is provided, the first connecting member 241 is connected to the second housing 12. The vent hole 121 communicating with the rear cavity is provided on the side surface of the second housing 12 or the first housing 11, which facilitates the exchange of airflow inside the sound-generating device 100 with the outside, making the air pressure on both sides of the diaphragm 21 more balanced and avoiding air pressure accumulation that could obstruct or distort the movement of the diaphragm 21.

[0064] Furthermore, a through hole is provided on the side surface of the housing 1, and part of the magnetic circuit assembly 3 is disposed in the through hole. This can further reduce the overall size of the sound generating device 100. When the side surface of the housing has both a vent hole 121 and a through hole, the vent hole 121 and the through hole should be located on different side surfaces. For example, the through hole can be disposed between the second housing 12, or the first housing 11, or between the first housing 11 and the second housing 12.

[0065] 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.

[0066] In the first embodiment, please refer to Figure 1The support piece 5 is located outside the voice coil 22. The second housing 12 has grooves on opposite sides along the third direction to accommodate the support piece 5 and adapt to its size. Multiple vent holes 121 are provided on the walls of the opposite sides of the second housing 12 along the second direction. At this time, the first housing 11 has two protrusions corresponding to the two grooves so that they can be embedded in the two grooves to ensure a tight fit between the first housing 11 and the second housing 12.

[0067] In the second embodiment, the support piece 5 is located between the two voice coils 22. The second housing 12 has first grooves on opposite sides along a third direction for partial insertion of the support piece 5. To accommodate the installation space of the support piece 5, the first housing 11 and the second housing 12 both have second grooves on opposite sides along a second direction. Part of the side magnet 32 ​​is located within the second groove to accommodate the spacing requirements of the two magnet groups. At this time, multiple vent holes 121 are provided on opposite sides of the first housing 11 along a third direction.

[0068] The diaphragm 21 includes a vibrating plate and a folded ring disposed around the vibrating plate. The connecting structure 23 connects to the vibrating plate. The surface of the vibrating plate is provided with a recess to increase stiffness and extend high-frequency vibration.

[0069] Please combine Figure 1 , Figure 2 and Figure 9 In the first embodiment, two magnetic groups, two voice coils 22, and two linkage mechanisms are symmetrically distributed along the b-axis. In the two linkage mechanisms, the second linkage 232 is provided corresponding to the first side magnetic part 321. The first side magnetic part 321 is provided with multiple protrusions 323, and the side space of each protrusion 323 forms a relief groove 324 for the second linkage 232 to accommodate.

[0070] In the second embodiment (not shown in the figure), two magnetic groups, two voice coils 22, and two linkage mechanisms are symmetrically distributed along the b-axis. In the two linkage mechanisms, the second linkage 232 is set corresponding to the second side magnetic part 322. The first side magnetic part 321 is provided with a protrusion 323. The side of the protrusion 323 facing the voice coil 22 is inclined towards the b-axis in the direction away from the diaphragm 21 to form an inclined surface. The second side magnetic part 322 is a single long bar magnet with multiple protrusions 323. The side space of each protrusion 323 forms a relief groove 324 for the second linkage 232 to be accommodated.

[0071] 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.

[0072] Please refer to Figures 11 to 12The housing 1 has vent holes 121 on its peripheral side. The outer shell 4 of the sound-generating module 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 component 2 and forms a front cavity with the diaphragm 21. The sound-emitting part 42 communicates with the front cavity. The outer shell 4 serves as the module housing. After assembly, it can be installed in the electronic device as an integral component with the housing 1 and the devices on it. In this embodiment, the main body 41 and the sound-emitting part 42 together form the front shell, which serves as a semi-module structure. On the one hand, this reduces the overall height of the sound-generating module. On the other hand, the inner cavity of the housing 1 can directly communicate with the cavity of the electronic device, using the rear cavity of the whole device as a sound cavity, improving sensitivity, and reducing the vibration resistance.

[0073] 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 producing device, characterized by, include: case; A magnetic circuit assembly is connected to one end of the housing along a first direction, and the magnetic circuit assembly has two magnetic gaps spaced apart along a second direction; A vibration assembly, comprising a diaphragm and two voice coils, wherein the diaphragm is connected to the other end of the housing along a first direction, and the two voice coils are respectively located within two magnetic gaps, and both voice coils can swing along a third-direction axis under the action of magnetic force; as well as, Two connection structures are provided for connecting the two voice coils to the diaphragm respectively. Each connection structure has a first end and a second end arranged opposite to each other along a first direction. The first end is connected to the diaphragm and the second end is connected to the voice coil. The connection structure includes a plurality of connecting rods that are rotatably connected in sequence. Two adjacent connecting rods are connected by a first rotating part. The first rotating part is made of a rigid material. When the voice coil rotates, it can drive each of the connecting rods to swing, thereby converting the rotation drive of the voice coil into a linear drive along a first direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other. The two voice coils rotate in opposite directions, the two connection structures are mirror-symmetrical, and the plurality of connecting rods include a first connecting rod, a second connecting rod, and a third connecting rod. The first connecting rod connects to the diaphragm, the third connecting rod connects to the voice coil, and the second connecting rod is connected to the first connecting rod and the third connecting rod through the first rotating part.

2. The sound production device of claim 1, wherein The major axis of the voice coil extends along the third direction; the major axis sides of the two voice coils that are close to each other are defined as the first major axis sides, and the major axis sides of the two voice coils that are far apart are defined as the second major axis sides; the second ends of the two connecting structures are respectively connected to the two first major axis sides or respectively connected to the two second major axis sides; and / or, The centerline of the voice coil is coplanar with the axis of rotation of the voice coil.

3. The sound production device of claim 1, wherein 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 production device of claim 3, wherein 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 production device of claim 3, wherein 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 production device of claim 5, wherein 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 magnet and the second direction is 0~80°.

7. The sound production device of claim 3, wherein The two side magnets include a first side magnet located on the side of the voice coil away from the other magnet group, and a second side magnet located on the side of the voice coil closer to the other magnet group. The first side magnet or the second side magnet has a protrusion on the side facing the diaphragm. The area adjacent to the protrusion forms a clearance groove, which is used to avoid a part of the connection structure.

8. The sound production device of claim 1, wherein, Multiple second connecting rods are provided, and these multiple second connecting rods are arranged at intervals along a third direction. Each second connecting rod is connected to the first connecting rod and the third connecting rod through the first rotating part; and / or, The first rotating part includes two first bushings and one first shaft. The first shaft is rotatably mounted into the two first bushings to achieve a rotatable connection between two adjacent connecting rods; wherein, the two first bushings are integrally formed with the opposing connecting rods; and / or, The rotation axes of the first connecting rod and the second connecting rod relative to each other are arranged to coincide with the projection of the corresponding rotation axis of the voice coil along the first direction; and / or, The distance between the rotation centers of the two first rotating parts is L1, and the distance between the rotation center of the first rotating part closest to the corresponding voice coil and the rotation center of the voice coil is L2. When the vibrating assembly is in the equilibrium position, L1=L2.

9. The sound production device of claim 1, wherein, The sound-generating device further includes two rotating engagement structures corresponding to the two voice coils. Each rotating engagement structure includes two first connectors and two second connectors. The two second connectors are fixedly connected to the two opposite sides of the voice coils along a third direction. The two first connectors are connected to the second connectors through a second rotating part and are fixedly connected to the housing.

10. The sound production device of claim 9, wherein, One of the second connector and the first connector is provided with a second bushing, and the other is provided with a second shaft. The second shaft is rotatably mounted inside the second bushing, and the second bushing and the second shaft cooperate to form the second rotating part; and / or, The third connecting rod and the second connecting member are integrally formed.

11. The sound production device of claim 1, wherein, The housing includes a first housing and a second housing disposed along the first direction; the diaphragm is connected to the first housing; the magnetic circuit assembly is connected to the second housing; a rear cavity is formed between the diaphragm and the second housing; a vent hole communicating with the rear cavity is provided on the side surface of the second housing or the first housing; and / or, The side surface of the housing has a through hole, and part of the magnetic circuit assembly is disposed in the through hole.

12. A sound production module, comprising: The device includes a housing and a sound-generating device as described in any one of claims 1-11, 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 is located on one side of the sound-generating device. The main body is connected to the vibration assembly and forms a front cavity with the diaphragm. The sound-emitting part communicates with the front cavity.

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