Sound production device and electronic device

Abstract

The application discloses a sound production device and electronic equipment, and relates to the technical field of electronic equipment. In the sound production device, a magnetic circuit assembly comprises a magnetic yoke, a center magnetic part and a side magnetic part arranged on the magnetic yoke. The center magnetic part comprises a plurality of center magnetic groups arranged at intervals along a second direction. Each center magnetic group comprises a first center magnet, a center dust core and a second center magnet connected in sequence along a first direction. Two side magnets of the side magnetic part are arranged on opposite sides of the center magnetic part along the second direction. The two side magnets and the plurality of center magnetic groups form two magnetic gaps. A vibration assembly comprises a diaphragm and two voice coils connected to the diaphragm. The voice coil has a height along the first direction and a thickness along the second direction. The height is not less than the thickness. Each voice coil is arranged in correspondence with a magnetic gap. A framework is connected to the diaphragm and the voice coil. The first center magnet and the second center magnet have the same magnetic pole close to the center dust core, forming a closed magnetic circuit, increasing the magnetic field strength and improving the magnetic flux density.

Description

Technical Field

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

[0002] With the rapid upgrading of smartphones and other mobile devices, consumers' demands for audio-visual entertainment experiences are constantly increasing, leading to more stringent standards for the audio performance of the entire product. Especially in terms of mobile phone speaker performance, the market's pursuit of ultra-thin and ultra-wide screens has increasingly limited the physical space available for speaker placement. Improving the speaker's vibration area and maximum amplitude faces significant design bottlenecks, making the achievement of superior acoustic performance within limited space a crucial industry challenge. Summary of the Invention

[0003] The main objective of this invention is to provide a sound-generating device and electronic device that can improve the stress on the diaphragm and increase the magnetic flux density by forming a closed magnetic circuit through magnetic design.

[0004] To achieve the above objectives, the present invention provides a sound-generating device, comprising: A magnetic circuit assembly includes a magnetic yoke and a central magnetic portion and a side magnetic portion disposed on the magnetic yoke. The central magnetic portion includes a plurality of central magnetic groups spaced apart along a second direction. Each central magnetic group includes a first central magnet, a central washer, and a second central magnet connected in sequence along a first direction. The second central magnet is disposed on the magnetic yoke. The first central magnet and the second central magnet have the same magnetic poles near the central washer. The side magnetic portion includes two side magnets. The two side magnets are disposed on opposite sides of the central magnetic portion along the second direction. The two side magnets are spaced apart from the central magnetic portion so as to form two magnetic gaps spaced apart along the second direction together with the plurality of central magnetic groups. A vibration assembly, comprising a diaphragm and two voice coils connected to the diaphragm, the voice coils having a height along a first direction and a thickness along a second direction, the height being not less than the thickness, the diaphragm being located on the side of the central magnetic portion away from the magnetic yoke, each voice coil being correspondingly disposed with a magnetic gap; and, The skeleton has one end connected to the diaphragm along a first direction and the other end connected to the two voice coils.

[0005] In one embodiment, the plurality of center magnet groups include a first center magnet group and two second center magnet groups located on opposite sides of the first center magnet group along a second direction. The second center magnet of the first center magnet group includes a main body segment and two extension segments located at opposite ends of the main body segment. Both extension segments extend along the second direction. The main body segment extends along a third direction, which is perpendicular to the second direction. The short axis of the voice coil corresponds to the extension segment.

[0006] In one embodiment, the first central magnet of the first central magnet group is a bar magnet that corresponds only to the main body segment.

[0007] In one embodiment, in a first direction, the middle portion of the voice coil corresponds to the center washer; and / or, Multiple central magnetic groups are magnetized along the vibration direction of the voice coil, and the multiple central magnetic groups are spaced apart around the two voice coils.

[0008] In one embodiment, the height of the second central magnet along the first direction is less than the height of the first central magnet along the first direction; and / or, The height of the side magnet along the first direction is greater than the height of the second center magnet along the first direction.

[0009] In one embodiment, the diaphragm includes a diaphragm and a pleated ring disposed around the periphery of the diaphragm, a portion of the diaphragm protruding toward the voice coil to form a convex portion, and the frame is connected to the convex portion.

[0010] In one embodiment, the skeleton includes two first frames spaced apart along a second direction, one end of each of the two first frames along the first direction is connected to the diaphragm, and the other end is connected to the two voice coils respectively.

[0011] In one embodiment, each of the first frames includes: A support body, wherein a plurality of connecting segments protrude from one side of the support body toward the voice coil, the plurality of connecting segments being spaced apart circumferentially along the support body, and the plurality of connecting segments being connected to the same voice coil; and, The second connecting part is located at the side end of the main body of the bracket and extends toward the voice coil; The sound-generating device further includes a centering support plate, which includes an outer support portion, a cantilever portion, and an inner support portion connected in sequence, and the inner support portion is connected to the second connecting portion.

[0012] In one embodiment, the sound-generating device further includes a housing and a centering support; the vibration assembly and the magnetic circuit assembly are respectively connected to both sides of the housing along a first direction; the outer edge of the diaphragm is connected to one end of the housing along the first direction; and the end of the housing opposite to the diaphragm is connected to the centering support; and / or, The sound-generating device further includes a centering support plate located between the voice coil and the magnetic yoke. The centering support plate includes a plurality of first support portions and a plurality of second support portions arranged circumferentially along the magnetic yoke. The plurality of first support portions are used to connect the skeleton and the lead wire of one of the voice coils, and the plurality of second support portions are used to connect the skeleton and the lead wire of the other voice coil.

[0013] The present invention also proposes an electronic device, including a sound-generating device, the sound-generating device comprising: A magnetic circuit assembly includes a magnetic yoke and a central magnetic portion and a side magnetic portion disposed on the magnetic yoke. The central magnetic portion includes a plurality of central magnetic groups spaced apart along a second direction. Each central magnetic group includes a first central magnet, a central washer, and a second central magnet connected in sequence along a first direction. The second central magnet is disposed on the magnetic yoke. The first central magnet and the second central magnet have the same magnetic poles near the central washer. The side magnetic portion includes two side magnets. The two side magnets are disposed on opposite sides of the central magnetic portion along the second direction. The two side magnets are spaced apart from the central magnetic portion so as to form two magnetic gaps spaced apart along the second direction together with the plurality of central magnetic groups. A vibration assembly, comprising a diaphragm and two voice coils connected to the diaphragm, the voice coils having a height along a first direction and a thickness along a second direction, the height being not less than the thickness, the diaphragm being located on the side of the central magnetic portion away from the magnetic yoke, each voice coil being correspondingly disposed with a magnetic gap; and, The skeleton has one end connected to the diaphragm along a first direction and the other end connected to the two voice coils.

[0014] In this invention, two voice coils are connected in parallel, sharing a single magnetic circuit assembly. Based on the magnetic gap configuration, the two voice coils are arranged in a mirror-symmetrical manner on both sides of the central magnetic group. When driven by a current in the same direction, based on the principle of electromagnetic vector superposition, the Lorentz forces generated by the two voice coils are in the same direction, thus increasing the driving force output. This voice coil layout avoids local stress concentration caused by single voice coil drive. The design of two voice coils improves the symmetry of the force on the diaphragm and reduces the nonlinear distortion of the vibration system. The first and second central magnets are arranged with opposite polarities, forming a closed magnetic circuit. Both magnets have their polarities pointing towards the washer, increasing the magnetic field strength and improving the magnetic flux density. This allows the voice coils to experience a more stable and balanced driving force when moving in the magnetic field. This stable driving force helps reduce nonlinear distortion during voice coil movement, thereby significantly improving the sound reproduction and sound quality of the sound-generating device. The symmetrical arrangement of each central magnetic group also enhances the overall stability of the magnetic circuit assembly, reducing vibrations and noise that may be caused by uneven magnetic field distribution, further optimizing sound quality. Setting the voice coil to a larger height allows it to cut more magnetic field lines during operation. Furthermore, when the voice coil's vibration amplitude is large, the number of magnetic field lines cut changes less, which helps improve the flatness of bl(x). Attached Figure Description

[0015] 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.

[0016] 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 sound-generating device; Figure 3 for Figure 1 Schematic diagram of the central skeleton; Figure 4 for Figure 1 A top view of the second central magnet.

[0017] Explanation of icon numbers: 100. Sound-generating device; 1. Magnetic circuit assembly; 10. Magnetic gap; 11. Magnetic yoke; 12. Central magnetic part; 121. First central magnet; 122. Central washer; 123. Second central magnet; 1231. Main body section; 1232. Extension section; 13. Side magnetic part; 131. Side magnet; 2. Vibration assembly; 21. Voice coil; 22. Vibrating plate; 220. Protrusion; 23. Wrapper; 3. Frame; 31. First frame; 311. Support body; 312. Connecting section; 313. Second connecting part; 4. Centering support plate; 41. Outer support part; 42. Cantilever part; 43. Inner support part; 44. First support part; 45. Second support part; 5. Outer shell.

[0018] 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

[0019] 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.

[0020] 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.

[0021] 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.

[0022] With the rapid updates and iterations of smartphones and other mobile devices, consumers' demands for audio-visual entertainment experiences are constantly increasing, which places higher standards on the audio performance of terminal products. Especially in terms of the performance of individual mobile phone speaker units, the market expects superior sound quality, higher sound pressure level output, and a slimmer design. Unlike traditional external speakers, modern smartphones pursue extreme screen-to-body ratios and thinness, making the spatial layout and performance optimization of speakers particularly crucial. However, traditional design solutions face physical limitations in terms of vibration area and amplitude within a limited space, resulting in very limited room for improvement in acoustic performance, making it difficult to meet the current market demands for mobile phone audio experiences. Therefore, exploring innovative speaker architectures has become a core breakthrough for improving mobile phone audio performance.

[0023] Due to the limited space within the overall cavity, it is difficult to increase the vibration area and vibration displacement. To address these issues, this invention proposes a sound-generating device that improves magnetic flux density through dual voice coil drive and magnetic coupling, thereby achieving better performance.

[0024] Please refer to Figures 1 to 3 The sound-generating device 100 includes a magnetic circuit assembly 1, a vibration assembly 2, and a frame 3. The magnetic circuit assembly 1 includes a magnetic yoke 11 and a central magnetic part 12 and a side magnetic part 13 disposed on the magnetic yoke 11. The central magnetic part 12 includes a plurality of central magnetic groups spaced apart along a second direction. Each central magnetic group includes a first central magnet 121, a central washer 122, and a second central magnet 123 connected sequentially in a first direction. The second central magnet 123 is disposed on the magnetic yoke 11. The magnetic poles of the first central magnet 121 and the second central magnet 123 near the central washer 122 are the same. The side magnetic part 13 includes two side magnets 131. Two side magnets 131 are respectively disposed on opposite sides of the central magnetic part 12 along the second direction. Each side magnet 131 is spaced apart from the central magnetic part 12, so as to form two magnetic gaps 10 spaced apart along the second direction together with multiple central magnetic groups. The vibration assembly 2 includes a diaphragm and two voice coils 21 connected to the diaphragm. The voice coils 21 have a height along the first direction and a thickness along the second direction. The height is not less than the thickness. The diaphragm is located on the side of the central magnetic part 12 away from the magnetic yoke 11. Each voice coil 21 is correspondingly disposed with a magnetic gap 10. The frame 3 is connected to the diaphragm at one end along the first direction and to the two voice coils 21 at the other end.

[0025] It should be noted that the first direction, second direction, and third direction in this application are three mutually perpendicular directions. Depending on the different placement orientations of the device, the first direction can be up and down, the second direction can be left and right, and the third direction can be front and back. When the placement orientation of the device changes, the orientations referred to by the first direction, second direction, and third direction change accordingly. In this embodiment, the first direction is the vibration direction of the voice coil 21, the second direction is the short axis direction of the voice coil 21, and the third direction is the long axis direction of the voice coil 21.

[0026] In the technical solution of this invention, two voice coils 21 are connected in parallel and share a single magnetic circuit assembly 1. Based on the arrangement of the magnetic gap 10, the two voice coils 21 are arranged in a mirror-symmetrical manner on both sides of the central magnetic group. When driven by a current in the same direction, based on the superposition principle of electromagnetic vectors, the Lorentz forces generated by the two voice coils 21 are in the same direction, thereby increasing the driving force output. This arrangement of voice coils 21 avoids local stress concentration caused by driving with a single voice coil 21. The design of two voice coils 21 improves the symmetry of the force on the diaphragm and reduces the nonlinear distortion of the vibration system. The first central magnet 121 and the second central magnet 123 are arranged with opposite polarities to form a closed magnetic circuit. The polarities of both magnets are directed towards the central washer 122, increasing the magnetic field strength and improving the magnetic flux density. This allows the voice coils 21 to receive a more stable and balanced driving force when moving in the magnetic field. This stable driving force helps reduce the nonlinear distortion during the movement of the voice coils 21, thereby significantly improving the sound reproduction and sound quality performance of the sound-generating device 100. The symmetrical arrangement of the central magnetic groups enhances the overall stability of the magnetic circuit assembly 1, reduces vibrations and noises that may result from uneven magnetic field distribution, and further optimizes sound quality. The voice coil 21 has a relatively large height, allowing it to cut more magnetic lines of force during its movement. Furthermore, when the vibration amplitude of the voice coil 21 is large, the number of magnetic lines cut changes less, which helps improve the flatness of bl(x).

[0027] It should be noted that the first direction is perpendicular to the second direction. If the thickness of the voice coil is greater than or equal to the height, the voice coil 21 will cut fewer magnetic field lines in the vibration direction, resulting in a worse effect.

[0028] Specifically, when the voice coil 21 is energized, it can cut the magnetic field lines and move along the first direction under the action of the magnetic circuit assembly 1. During the movement of the voice coil 21, it drives the frame 3 to move, thereby causing the diaphragm to vibrate.

[0029] The use of the central washer 122 not only serves to connect the central magnet, but also effectively conducts and concentrates the magnetic field. It can better guide the magnetic field generated by the central magnet to the area where the voice coil 21 is located, improving the utilization rate of the magnetic field. This allows the voice coil 21 to convert electrical energy into mechanical energy more efficiently, thereby improving the sound energy conversion efficiency of the sound generating device 100.

[0030] Based on the design of two voice coils 21, multiple central magnetic groups include a first central magnetic group and two second central magnetic groups located on opposite sides of the first central magnetic group along a second direction. The first central magnetic group is located between the two voice coils 21, and the two second central magnetic groups are embedded in the inner holes of the voice coils 21. For example, in the first central magnetic group, the end of the first central magnet 121 near the central washer 122 is the N pole, and the corresponding end of the second central magnet 123 near the central washer 122 is also the N pole; in the second central magnetic group, the end of the first central magnet 121 near the central washer 122 is the S pole, and the corresponding end of the second central magnet 123 near the central washer 122 is also the S pole. When the magnetic lines of force start from the N pole of the first central magnet 121, pass through the area where the voice coil 21 is located, return to the S pole of the second central magnet 123, and then return to the N pole of the first central magnet 121 through other parts of the magnetic circuit, forming a complete closed magnetic circuit.

[0031] It should be understood that the shape of the central washer 122 should be compatible with the corresponding magnet. For example, in the central magnetic assembly located in the middle, the second central magnet 123 is set in an H-shape, and the central washer 122 is set in an H-shape to better concentrate the magnetic field lines.

[0032] In some embodiments, in at least one central magnet assembly, the first central magnet 121 and the second central magnet 123 are arranged with different dimensions along a third direction. This arrangement allows for space reservation while ensuring magnetic circuit fit, thereby providing more space for structures such as the frame 3, and thus meeting the travel requirements of the voice coil 21 and the installation requirements of other components while compressing the overall size in the first direction.

[0033] In this embodiment, in the central magnetic group located in the middle, the second central magnet 123 is set to H-shape and the first central magnet 121 is set to rectangle. In the central magnetic group located at the edge, the first central magnet 121 and the second central magnet 123 are adapted to the shape of the inner hole of the voice coil 21 because they correspond to the inner hole of the voice coil 21.

[0034] exist Figure 4In the embodiment, in the first central magnetic group, the second central magnet 123 includes a main body segment and two extension segments 1232 located at opposite ends of the main body segment 1231. Both extension segments 1232 extend along a second direction, while the main body segment 1231 extends along a third direction, which is perpendicular to the second direction. The short axis of the voice coil 21 corresponds to the extension segments 1232. The two second central magnetic groups are located on opposite sides of the main body segment 1231 along the second direction. The extension segments 1232 are added at both ends of the main body segment 1231, increasing the size of the second central magnet 123. The main body segment 1231 and the two extension segments 1232 are integrated as a whole. A closed magnetic circuit can be formed by the N and S poles of the second central magnet 123 in the first direction. The voice coil 21 can simultaneously cut the magnetic field lines of the main body segment 1231 and the extension segments 1232 at both ends, thus fully improving space utilization and enhancing the acoustic performance of the sound-generating device, making it more compatible with the whole machine.

[0035] For example, in the first central magnet group, the first central magnet 121 is a bar magnet that corresponds only to the main body segment 1231, which can avoid the protrusion 220 of the vibrating plate 22 during the vibration of the diaphragm.

[0036] It should be noted that the main body and the two extension sections are an integrated structure. Compared to some structures that use multiple magnets to correspond to different directions of the voice coil 21, this integrated structure provides a larger magnetic field coverage, more magnetic field cutting of the voice coil 21, and greater structural strength. The side magnet 131 is set separately and is not combined with the second center magnet 123 because, in terms of structural principle, even if the side magnet 131 and the second center magnet 123 were integrated, a notch would necessarily need to be set on the periphery of the voice coil 21 to avoid interference with the frame 3 and other structures, thus increasing the difficulty of manufacturing.

[0037] In other embodiments, the side magnet 131 may also be composed of a first side magnet 131, a side washer, and a second side magnet 131 stacked together.

[0038] The two extension segments can have the same or different lengths in the second direction, and their connection points with the main body segment can be the same or different. Correspondingly, the two side magnets 131 are appropriately positioned to accommodate the two extension segments. For example, if the two extension segments connect to the main body segment at the middle and have the same length, the second center magnet 123 is H-shaped, and the voice coil 21 can simultaneously cut the magnetic field lines at both ends of the H-shaped magnet. The two side magnets 131 are then arranged in a long strip shape (in conjunction with...). Figure 2For example, the two extension segments on the same side of the main body segment may have different lengths, but the second central magnet 123 is centrally symmetrically arranged. Correspondingly, the two side magnets 131 are L-shaped and centrally symmetrically arranged. In this application, it is preferred that the two extension segments 1232 have the same length in the second direction, and the portions of the extension segments 1232 on the same side of the main body segment 1231 have the same length. This facilitates process design and ensures the consistency of the magnetic field lines cut by the two voice coils 21.

[0039] In this embodiment, the short axis of the voice coil 21 corresponds to the extension segment. That is, the long axis of the voice coil 21 extends along the second direction, and the short axis of the voice coil 21 extends along the third direction. This arrangement can increase space utilization and magnetic field line cutting while reducing the axial space of the entire device, which is beneficial to reducing the overall size of the device. This not only adapts to the flat structure of the whole device, which has significant advantages in today's electronic devices that pursue thinness and lightness, but also reduces resonance and noise problems that may be caused by excessive internal space, thereby improving the purity of sound and sound quality performance.

[0040] In some embodiments, multiple central magnetic groups are magnetized along the vibration direction of the voice coil 21, and the multiple central magnetic groups are spaced apart around the two voice coils 21. That is, multiple first central magnets 121 and multiple second central magnets 123 are spaced apart along the circumference of the voice coil 21, corresponding to three adjacent sides of the voice coil 21. The multiple central magnetic groups correspond to one side of the long axis and both sides of the short axis of the voice coil 21, and the corresponding first central magnets 121 are spaced apart from each other and do not contact each other.

[0041] The vibration effect of the diaphragm is influenced not only by the distribution and intensity of the magnetic field, but also by the relative positional relationship between the voice coil 21 and the magnetic circuit assembly 1. In this embodiment, in the first direction, the middle part of the voice coil 21 corresponds to the center washer 122. This arrangement allows the voice coil 21 to be positioned in the middle of the magnetic gap 10, which not only improves the utilization rate of the magnetic gap 10, but also helps to optimize the effective range of the magnetic field, thereby improving the overall vibration performance of the diaphragm and the stability of the sound output.

[0042] In terms of diaphragm structure design, the diaphragm includes a vibrating plate 22 and a folded ring 23 disposed around the vibrating plate 22; the frame 3 is connected to the vibrating plate 22. That is, a hole is formed in the central area of ​​the folded ring 23, and the vibrating plate 22 covers the through hole, which can further reduce the mass of the vibrating component 2 and adjust the acoustic performance of the sound generating device 100.

[0043] Based on this, when the first central magnet 121 in the first central magnet group is a strip-shaped arrangement that corresponds only to the main body segment 1231, it can also avoid the protrusion of the vibrating plate 22 during the vibration of the diaphragm. This avoidance design can also optimize the internal spatial layout of the sound-generating device.

[0044] The height of the second center magnet 123 along the first direction is less than the height of the first center magnet 121 along the first direction; with the height of the sound-generating device 100 being constant, this ensures that the diaphragm has sufficient vibration space and that the vibration space of the voice coil 21 on both sides opposite to each other in the first direction tends to be consistent.

[0045] Based on the structural design of the magnet, the height of the side magnet 131 in the first direction is greater than the height of the second central magnet 123 in the first direction. Therefore, in the spatial arrangement, since the voice coil 21 is located between the central washer 122 and the side magnet 131, the reasonable height setting of the side magnet 131 can make the position of the voice coil 21 in the magnetic gap 10 fill. That is, the relationship between the winding width of the voice coil 21 and the height of the magnetic gap 10 is more suitable, and the utilization efficiency of magnetic energy is high.

[0046] Based on the above embodiments, since the overall trend of the diaphragm is downward bending, it is easy to interfere with the side magnet 131 when the diaphragm vibrates downward. Therefore, the thickness of the side magnet 131 needs to be lower than the total thickness of the central magnet group in the first direction. That is, the side magnet 131 is higher than the second central magnet 123 in the first direction, but lower than the first central magnet 121.

[0047] Based on the above embodiment, a portion of the diaphragm 22 protrudes towards the voice coil 21 to form a protrusion 220; the frame 3 is connected to the protrusion 220. The design of the protrusion 220, in conjunction with the frame 3, allows the voice coil 21 to sink towards the magnetic yoke 11. Compared to traditional structures, the voice coil 21 can sink deeper into the magnetic gap 10, thereby improving the utilization rate of the magnetic gap 10, increasing the effective length of the cut magnetic field lines, and improving the overall performance by increasing the BL parameter.

[0048] Furthermore, the protrusion 220 can be formed on the end face of the diaphragm 22 facing the voice coil 21, or it can be formed by partially sinking the end face of the diaphragm 22 away from the voice coil 21, thereby forming the protrusion 220 on the end face of the diaphragm facing the voice coil 21.

[0049] The number and structure of the protrusions 220 are not limited. Provided that the protrusions 220 meet certain dimensional requirements in the first direction, they can be designed to match the structure of the frame 3. For example, when the frame 3 is arranged in a ring shape, the protrusions 220 can be arranged in a corresponding ring shape to achieve a harmonious match between form and function, enhancing the fit between components and contributing to improved overall structural stability and mechanical performance. For instance, when two protrusions 220 are arranged side-by-side on the frame 3 to correspond to two voice coils 21, two protrusions 220 can be arranged accordingly.

[0050] The present invention does not limit the specific structure of the skeleton 3, as long as it can satisfy the connection relationship between the vibrating plate 22 and the voice coil 21. It is possible to set one skeleton 3 to be bonded and cooperate with two voice coils 21 at the same time, or to set two skeletons 3 to correspond to two voice coils 21 respectively.

[0051] Please refer to Figure 1 and Figure 3 In the technical solution of this invention, the frame 3 includes two first frames 31 spaced apart along a second direction. One end of each first frame 31 along the first direction is connected to a diaphragm, and the other end is connected to two voice coils 21 respectively. This connection method creates a stable and effective transmission structure between the diaphragm and the voice coils 21. When the voice coils 21 vibrate in a magnetic field due to changes in current, the vibration can be accurately and efficiently transmitted to the diaphragm 22 through the first frames 31. The two first frames 31 are spaced apart along the second direction, thus providing a certain space between them, which allows for greater space for the placement of the magnetic circuit assembly 1.

[0052] Please refer to Figure 4 The first frame 31 includes a support body 311, with a first connecting portion on the side of the support body 311 facing the voice coil 21; a second connecting portion 313 is also provided on the side end of the support body 311, extending towards the voice coil 21; the sound-generating device 100 also includes a centering support 4, which connects the second connecting portion 313 and the lead wire of the voice coil 21. In its structural design, the first frame 31 connects with the voice coil 21 through its central region and with the centering support through its peripheral region, thereby optimizing the internal spatial layout of the sound-generating device 100 and reducing energy loss during vibration transmission while achieving a tight and stable connection.

[0053] Specifically, the first connecting part is formed by bending and extending a portion of the support body 311 toward the voice coil 21. The design of the first connecting part allows the voice coil 21 to sink further toward the magnetic yoke 11, which can free up the height design of the protrusion 220, or better match the protrusion 220, thereby improving the utilization rate of the magnetic gap 10, increasing the effective length of the cutting magnetic field lines, and improving the overall performance by increasing the BL parameter.

[0054] It should be understood that the centering support 4, as an important component in the sound-generating device 100, is crucial to the performance of the entire sound-generating system. When the voice coil 21 vibrates, the centering support 4 can play a role in auxiliary positioning and buffering, preventing the voice coil 21 from shifting or shaking during vibration, thereby ensuring accurate sound propagation and stable sound quality.

[0055] The centering support 4 includes an outer support 41, a cantilever 42, and an inner support 43 connected in sequence. The inner support 43 is connected to the second connecting part 313, providing stable support for the centering support 4 and ensuring its fixed position during the operation of the sound-generating device 100. The cantilever 42 has a certain degree of elasticity, which can buffer and guide the vibration of the voice coil 21, making the vibration of the voice coil 21 more stable and regular. The inner support 43 is electrically connected to the lead wire of the voice coil 21, further enhancing the cooperative working ability between the voice coil 21 and the centering support 4. The centering support 4 is connected to the frame 3 and the diaphragm 22, which can suppress diaphragm polarization, free up the magnetic circuit, and eliminate the need for a larger clearance space to avoid the inner support 43, thereby increasing the magnet mounting volume. The increased magnet mounting volume can generate a stronger magnetic field, further improving the efficiency of the voice coil 21 in cutting magnetic field lines.

[0056] The inner support portion 43 also has a pad for electrical connection with the voice coil lead. The lead of the voice coil 21 can be attached to the inside of the second connection portion 313 and finally connected to the pad on the inner support portion 43.

[0057] The sound-generating device 100 also includes a housing 5, a vibration component 2 and a magnetic circuit component 1 respectively connected to both sides of the housing 5 along the first direction, the outer edge of the diaphragm connected to one end of the housing 5 along the first direction, and an outer support 41 connected to one end of the housing 5 away from the diaphragm.

[0058] Based on the arrangement of the magnetic circuit components, there are four inner support parts 43, which correspond to the areas between the side magnet 131 and the extension section 1212, respectively, thus ensuring spatial avoidance. It should be understood that, based on the four inner support parts 43, the cantilever part 42 is provided with four inner support parts 43 in a one-to-one correspondence, and the outer support part 41 can be provided with one, two, or four.

[0059] Furthermore, the central part of the support body 311 is hollowed out to form a hollow area; that is, the support body 311 as a whole has a ring structure, corresponding to the reversing structure of the voice coil 21. A portion of the vibrating plate 22 protrudes towards the voice coil 21 to form a protrusion 220, which is ring-shaped and corresponds to the outer periphery of the hollow area. Thus, it matches the support body 311. The hollowed-out design in the central part of the support body 311 not only reduces the weight of the first frame 31 and lowers the overall energy consumption of the sound-generating device 100, but also provides some space for heat dissipation.

[0060] The specific structural form of the first connecting part is not limited. The first connecting part can be arranged in a ring shape, corresponding to the outer periphery of the hollow area, and bonded to the end face of the voice coil 21. In this embodiment, the first connecting part includes multiple connecting segments 312 arranged at intervals along the circumference of the support body 311, and the multiple connecting segments 312 are connected to the corresponding voice coil 21. The multiple connecting segments 312 are arranged at intervals, which can more evenly disperse the vibration transmitted from the voice coil 21, avoid the problem of stress concentration, and enable the first frame 31 to receive and transmit vibration more stably, which helps to improve the overall stability and reliability of the sound generating device 100. At the same time, it can improve the airflow inside the sound generating device 100, improve the exchange efficiency and heat dissipation performance when the airflow inside the sound generating device 100 exchanges with the outside through the sound vent.

[0061] Considering the shape characteristics of the voice coil 21, multiple connecting segments 312 correspond to multiple corners of the voice coil 21. That is, each connecting segment 312 can correspond to the adjacent two sides of the voice coil 21, thus achieving a more stable connection and vibration transmission effect.

[0062] The present invention does not limit the structural form of the second connecting part 313; it can be sheet-like or multi-segmented and bent. When the second central magnet 123 located in the middle is composed of a main body segment and two extension segments, the second connecting part 313 includes a first support segment and a second support segment set at an angle. The first support segment is connected to the side end of the support body 311 and is horizontally set, corresponding to the area between the extension segment and the side magnet. Specifically, the first support segment extends away from the support body 311 and away from the extension segment, thereby corresponding to the periphery of the extension segment and avoiding the second central magnet 123. The second support segment extends along a first direction and connects with the first support segment and the centering support plate 4. That is, the second connecting part 313 is L-shaped, and the inclined setting of the first support segment cleverly avoids the second central magnet 123, thereby adapting to the shape characteristics of the second central magnet 123, avoiding mutual interference that may occur during the operation of the sound generating device 100, ensuring the stability of the magnetic field, and at the same time being able to adapt to the spacing between the frame 3 and the centering support plate 4. Within the limited internal space, the L-shaped second connecting part 313 can be rationally arranged and cooperate with other components, making the structure of the entire sound-generating device 100 more compact.

[0063] It should be noted that the first connecting part and the second connecting part 313 can be assembled with the bracket body 311 as a whole. In this embodiment, the first connecting part and the second connecting part 313 are integrally formed with the bracket body 311. Considering the structural strength and stress issues, the end face of the bracket body 311 away from the voice coil 21 is recessed near the hollow area, so that the side of the bracket body 311 facing the voice coil 21 forms a protruding structure, and the protruding structure constitutes the first connecting part.

[0064] On the two first frames 31, based on the cooperation between the main body segment and the two extension segments in the second central magnet 123, in the second direction, the two first support segments corresponding to the same extension segment extend in a direction away from each other.

[0065] In some embodiments, the two first frames 31 can be connected as one unit by a connecting rod, so that the two first frames 31 and the connecting rod are integrally formed. In this case, the connecting rod can be connected to the two support bodies 311 or to the two second connecting parts 313.

[0066] In some embodiments, the centering support 4 is located between the voice coil 21 and the magnetic yoke 11. The centering support 4 includes a plurality of first support portions 44 and a plurality of second support portions 45 arranged circumferentially along the magnetic yoke 11. The plurality of first support portions 44 are used to connect the skeleton 3 and the lead wire of one of the voice coils 21, and the plurality of second support portions 45 are used to connect the skeleton 3 and the lead wire of the other voice coil 21. In this embodiment, two first support portions 44 and two second support portions 45 are provided, which correspond to the two opposite sides of the voice coil 21 in the second direction. The first support portions 44 and the second support portions 45 are both composed of an outer support portion 41, a cantilever portion 42 and an inner support portion 43. The skeleton 3 is correspondingly configured with two first frames 31, each of which includes two second connecting portions 313 to respectively cooperate with the two first support portions 41 or the two second support portions 42.

[0067] Please refer to Figure 1 In this embodiment, the sound-generating device 100 is composed of a vibrating plate 22, a diaphragm, an injection-molded shell 5, a frame 3, three central magnetic groups, two voice coils 21, a side magnetic part 13, four centering supports 4, and a magnetic yoke 11. The two voice coils 21 share a magnetic circuit system. When driven by current in the same direction, based on the principle of superposition of electromagnetic vectors, the Lorentz force generated by the two voice coils 21 forms a synergistic effect, thereby increasing the driving force output. The side magnet 131, the first central magnet 121, and the second central magnet 123 are neodymium iron boron magnets, which form a closed magnetic circuit by alternating N and S poles. The first central magnet 121 adopts an H-shaped structure, which transforms the traditional method of cutting only single-sided central magnetic field lines into a multi-sided one, thus fully improving space utilization. The first central magnet 121 and the second central magnet 123 form a magnetically opposed design, and by arranging opposite polarities, a closed magnetic circuit is formed, increasing the magnetic flux density. The vibrating plate 22 is bonded to the two first frames 31 by setting a recessed groove to form two annular protrusions 220. This allows the voice coil 21 to be lowered to a magnetic gap depth 10, which is unattainable in traditional designs. This increases the effective working length of the voice coil 21 and improves the utilization rate of the magnetic gap. Ultimately, this increases the product's BL value and makes it more suitable for overall assembly.

[0068] The present invention also proposes an electronic device, which includes a sound-generating device 100. The specific structure of the sound-generating device 100 is as described in the above embodiments. Since all the technical solutions of the above embodiments are adopted, 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.

[0069] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: A magnetic circuit assembly includes a magnetic yoke and a central magnetic portion and a side magnetic portion disposed on the magnetic yoke. The central magnetic portion includes a plurality of central magnetic groups spaced apart along a second direction. Each central magnetic group includes a first central magnet, a central washer, and a second central magnet connected in sequence along a first direction. The second central magnet is disposed on the magnetic yoke. The first central magnet and the second central magnet have the same magnetic poles near the central washer. The side magnetic portion includes two side magnets. The two side magnets are disposed on opposite sides of the central magnetic portion along the second direction. The two side magnets are spaced apart from the central magnetic portion so as to form two magnetic gaps spaced apart along the second direction together with the plurality of central magnetic groups. A vibration assembly, comprising a diaphragm and two voice coils connected to the diaphragm, the voice coils having a height along a first direction and a thickness along a second direction, the height being not less than the thickness, the diaphragm being located on the side of the central magnetic portion away from the magnetic yoke, each voice coil being correspondingly disposed with a magnetic gap; and, The skeleton has one end connected to the diaphragm along a first direction and the other end connected to the two voice coils.

2. The sound-generating device as described in claim 1, characterized in that, The plurality of center magnet groups include a first center magnet group and two second center magnet groups located on opposite sides of the first center magnet group along a second direction. The second center magnet of the first center magnet group includes a main body segment and two extension segments located at opposite ends of the main body segment. Both extension segments extend along the second direction. The main body segment extends along a third direction, which is perpendicular to the second direction. The short axis of the voice coil corresponds to the extension segment.

3. The sound-generating device as described in claim 2, characterized in that, The first central magnet of the first central magnetic group is a bar magnet that corresponds only to the main body segment.

4. The sound-generating device as described in claim 1, characterized in that, In the first direction, the middle portion of the voice coil corresponds to the center washer; and / or, The multiple central magnetic groups are all magnetized along the vibration direction of the voice coil, and the multiple central magnetic groups are spaced apart around the two voice coils.

5. The sound-generating device as described in claim 1, characterized in that, The height of the second central magnet along the first direction is less than the height of the first central magnet along the first direction; and / or, The height of the side magnet along the first direction is greater than the height of the second center magnet along the first direction.

6. The sound-generating device as claimed in claim 1, characterized in that, The diaphragm includes a vibrating plate and a folded ring disposed around the periphery of the vibrating plate. A portion of the vibrating plate protrudes toward the voice coil to form a convex portion, and the frame is connected to the convex portion.

7. The sound-generating device as described in claim 6, characterized in that, The frame includes two first frames spaced apart along a second direction. One end of each of the two first frames along the first direction is connected to the diaphragm, and the other end is connected to the two voice coils respectively.

8. The sound-generating device as claimed in claim 7, characterized in that, Each of the first frames includes: A support body, wherein a plurality of connecting segments protrude from one side of the support body toward the voice coil, the plurality of connecting segments being spaced apart circumferentially along the support body, and the plurality of connecting segments being connected to the same voice coil; and, The second connecting part is located at the side end of the main body of the bracket and extends toward the voice coil; The sound-generating device further includes a centering support plate, which includes an outer support portion, a cantilever portion, and an inner support portion connected in sequence, and the inner support portion is connected to the second connecting portion.

9. The sound-generating device as claimed in claim 1, characterized in that, The sound-generating device further includes a housing and a centering support plate. The vibration assembly and the magnetic circuit assembly are respectively connected to both sides of the housing along a first direction. The outer edge of the diaphragm is connected to one end of the housing along the first direction, and the end of the housing opposite to the diaphragm is connected to the centering support plate; and / or, The sound-generating device further includes a centering support plate located between the voice coil and the magnetic yoke. The centering support plate includes a plurality of first support portions and a plurality of second support portions arranged circumferentially along the magnetic yoke. The plurality of first support portions are used to connect the skeleton and the lead wire of one of the voice coils, and the plurality of second support portions are used to connect the skeleton and the lead wire of the other voice coil.

10. An electronic device, characterized in that, Includes the sound-generating device as described in any one of claims 1 to 9.

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