Sound production device and acoustic device

Abstract

The utility model relates to the technical field of electroacoustic conversion, and particularly relates to a sound production device and an acoustic device. The sound production device comprises a shell, a magnetic circuit system and a vibration system. The magnetic circuit system is connected to the shell and comprises a magnetic yoke, a central magnetic part arranged at the magnetic yoke, a shared magnetic part and a side magnetic part. The shared magnetic part is arranged around the central magnetic part and a first magnetic gap is formed between the shared magnetic part and the central magnetic part. The side magnetic part is arranged around the shared magnetic part and a second magnetic gap is formed between the side magnetic part and the shared magnetic part. The vibration system is connected to the shell and comprises a diaphragm, a first voice coil and a second voice coil connected to the diaphragm. The first voice coil is arranged in the first magnetic gap, and the second voice coil is arranged in the second magnetic gap. The shared magnetic part comprises a shared magnet, a shared magnetically conductive plate and an auxiliary magnet arranged in the magnetic yoke in sequence along the vibration direction of the diaphragm. The shared magnet and the auxiliary magnet are magnetized along the vibration direction of the diaphragm and the magnetization directions are opposite. The sound production device has higher loudness and sensitivity.

Description

Technical Field

[0001] This utility model relates to the field of electroacoustic conversion technology, and specifically to a sound-generating device and an acoustic device using the sound-generating device. Background Technology

[0002] Miniature speakers are widely used in modern portable, communication, and smart devices due to their small size. Users' demand for high sound quality is also increasing, especially for some portable smart devices. Users are no longer satisfied with the presence or absence of sound, but are pursuing better sound quality.

[0003] Loudness (sensitivity) is a key indicator of the performance of miniature loudspeakers, and the driving force factor (BL) is a crucial factor affecting loudspeaker sensitivity. Current loudspeaker magnetic circuit designs have low center magnet utilization, making it extremely difficult to improve BL without changing the product size, thus failing to meet customer demands for sound quality.

[0004] Therefore, in view of the above shortcomings, this utility model is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a sound-generating device and an acoustic device using the sound-generating device, with the aim of improving the loudness and sensitivity of the sound-generating device by improving the magnetic circuit system of the sound-generating device.

[0006] To achieve the above objectives, this utility model proposes a sound-generating device, comprising:

[0007] shell;

[0008] A magnetic circuit system is connected to the housing and includes a yoke, a central magnetic part, a common magnetic part and a side magnetic part spaced apart from each other on the yoke. The common magnetic part is arranged around the central magnetic part and a first magnetic gap is formed between them. The side magnetic part is arranged around the common magnetic part and a second magnetic gap is formed between them.

[0009] A vibration system, connected to the housing, includes a diaphragm and a first voice coil and a second voice coil connected to the diaphragm. The first voice coil is disposed in the first magnetic gap, and the second voice coil is disposed in the second magnetic gap.

[0010] The common magnetic part includes a common magnet, a common magnetic plate and an auxiliary magnet stacked sequentially on the magnetic yoke along the vibration direction of the diaphragm. The common magnet and the auxiliary magnet are both magnetized along the vibration direction of the diaphragm but in opposite directions.

[0011] The sound-generating device provided by this utility model can also have the following additional technical effects:

[0012] In some specific embodiments of this utility model, the central magnetic part includes a central magnet and a central magnetic plate sequentially stacked on the magnetic yoke along the vibration direction, and the side magnetic part includes a side magnet and a side magnetic plate sequentially stacked on the magnetic yoke along the vibration direction. The magnetization direction of the side magnet is opposite to the magnetization direction of the common magnet, and the magnetization direction of the central magnet is opposite to the magnetization direction of the common magnet. A first magnetic gap is formed between the central magnetic plate and the common magnetic plate, and a second magnetic gap is formed between the common magnetic plate and the side magnetic plate.

[0013] In some specific embodiments of this utility model, the diaphragm includes a first fixing part, a first folded ring, a first vibrating part, a second folded ring, a second fixing part, a third folded ring, and a second vibrating part connected sequentially from the outside to the inside, wherein the first fixing part is connected to the outer shell, and the second fixing part is connected to the auxiliary magnet.

[0014] In some specific embodiments of this utility model, the vibration system further includes a frame, which includes an inner ring frame, an outer ring frame, and a connecting frame connecting the inner ring frame and the outer ring frame. The inner ring frame connects the second vibration part and the first voice coil, and the outer ring frame connects the first vibration part and the second voice coil. The connecting frame includes two frames, and the common magnet has a first gap to avoid the connecting frame.

[0015] In some specific embodiments of this utility model, the vibration system further includes a flexible printed circuit board, which includes an inner ring circuit board, a middle circuit board, an outer ring circuit board, an inner connecting part, and an outer connecting part. The inner ring circuit board, the middle circuit board, and the outer ring circuit board are nested sequentially from the inside to the outside. The inner ring circuit board is connected between the inner ring skeleton and the first voice coil, the middle circuit board is connected between the outer ring skeleton and the second voice coil, and the outer ring circuit board is connected between the first fixing part and the outer shell. The inner connecting part includes two parts and is arranged corresponding to the connecting skeleton. The inner connecting part is connected between the inner ring circuit board and the middle circuit board. The outer connecting part includes four parts and is connected between the middle circuit board and the outer ring circuit board. The side magnet part has a second gap to avoid the outer connecting part.

[0016] In some specific embodiments of this utility model, the central magnetic part is circular; the common magnetic part is arc-shaped and includes two, with the first gap formed between adjacent common magnetic parts; the side magnetic parts are arc-shaped and include four, with the second gap formed between adjacent side magnetic parts.

[0017] In some specific embodiments of this utility model, both the second folded ring and the third folded ring include two, and each second folded ring and the corresponding third folded ring form a contoured structure that is approximately the same as the outer contour of the corresponding common magnetic part. The second fixing part is located inside the contoured structure and is connected to the common magnetic part.

[0018] In some specific embodiments of this utility model, the two ends of the external connecting part are respectively set at an angle to the line connecting the center of the flexible printed circuit board.

[0019] In some specific embodiments of this utility model, both the second folded ring and the third folded ring are arranged to protrude in a direction away from the magnetic circuit system.

[0020] A second aspect of this utility model also provides an acoustic device, the acoustic device comprising a housing and a sound-generating device as described in any one of the above.

[0021] This embodiment of the invention connects the magnetic circuit system to the outer shell, and the periphery of the diaphragm of the vibration system to the outer shell, thereby integrating and fixing the magnetic circuit system and the vibration system onto the outer shell. Simultaneously, by configuring the magnetic circuit system as a yoke and including a central magnetic part, a common magnetic part, and a side magnetic part on the yoke, with the common magnetic part located outside the central magnetic part and spaced apart to form a first magnetic gap, and the side magnetic part located outside the common magnetic part and spaced apart to form a second magnetic gap, the first voice coil of the vibration system is correspondingly positioned with respect to the first magnetic gap, and the second voice coil is correspondingly positioned with respect to the second magnetic gap, forming an inner and outer double voice coil structure. Thus, the first voice coil and... A current is passed through the second voice coil, causing the two voice coils to vibrate within the magnetic fields of the first and second magnetic gaps formed by the magnetic circuit system, respectively, which in turn drive the diaphragm to vibrate and produce sound, thereby increasing the BL value. Furthermore, by setting the common magnetic part as a stacked common magnet, a common magnetic guide plate, and an auxiliary magnet, and by magnetizing the common magnet and the auxiliary magnet in opposite directions along the vibration direction of the diaphragm, the common magnetic part is shared by the central magnetic part and the side magnetic part, forming two magnetic gaps arranged inside and outside. This further increases the magnetic field strength of the two magnetic gaps, improves the magnetic energy utilization rate of the magnetic circuit system, and thus enhances the loudness and sensitivity of the sound-producing device, thereby improving product performance. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1This is a front view of the sound-generating device in an embodiment of this utility model;

[0024] Figures 2-3 They are respectively Figure 1 Cross-sectional structural diagram of AA and BB;

[0025] Figure 4 for Figure 1 Exploded structural diagram;

[0026] Figures 5-6 These are partial structural schematic diagrams of the sound-generating device in the embodiments of this utility model;

[0027] Figure 7 for Figure 6 The main view.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100 - Sound-generating device;

[0030] 10-Outer shell;

[0031] 20-Magnetic circuit system, 21-Magnetic yoke, 22-Central magnetic part, 221-Central magnet, 222-Central magnetic guide plate, 23-Common magnetic part, 231-Common magnet, 232-Common magnetic guide plate, 233-Auxiliary magnet, 24-Side magnetic part, 241-Side magnet, 242-Side magnetic guide plate, 20a-First gap, 20b-Second gap;

[0032] 30-Vibration system; 31-Diaphragm; 311-First fixing part; 312-First surround; 313-First vibrating part; 314-Second surround; 315-Second fixing part; 316-Third surround; 317-Second vibrating part; 32-First voice coil; 33-Second voice coil; 34-Frame; 341-Inner ring frame; 342-Outer ring frame; 343-Connecting frame; 35-Flexible printed circuit board; 351-Inner ring circuit board; 352-Intermediate circuit board; 353-Outer ring circuit board; 354-Inner connecting part; 355-Outer connecting part; 36-Reinforcing plate. Detailed Implementation

[0033] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0034] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0035] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0036] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0037] Sound-generating devices are widely used in modern portable, communication, and smart devices, and users' demand for high-quality sound is increasing. Especially for some portable smart devices, users are no longer satisfied with the presence or absence of sound, but are pursuing better sound quality.

[0038] Loudness (sensitivity) is a key indicator of the performance of a sound-generating device, and the driving force factor (BL) is a crucial factor affecting the sensitivity of the device. Current sound-generating device magnetic circuit designs suffer from low system utilization, making it extremely difficult to improve BL without changing the product size, thus failing to meet customer demands for sound quality.

[0039] To address the aforementioned problems, this utility model proposes a sound-generating device 100, which can be applied to acoustic devices and improve the loudness and sensitivity of the acoustic devices. The acoustic device can be a portable mobile electronic product such as a mobile phone or iPad, or a wearable device such as a watch, VR, or AR, etc., and is not limited thereto.

[0040] Reference Figures 1-7 This utility model proposes a sound-generating device 100, including a housing 10, a magnetic circuit system 20, and a vibration system 30. The magnetic circuit system 20 is connected to the housing 10 and includes a magnetic yoke 21, a central magnetic part 22, a common magnetic part 23, and a side magnetic part 24 spaced apart from each other on the magnetic yoke 21. The common magnetic part 23 is arranged around the central magnetic part 22 and a first magnetic gap is formed between them. The side magnetic part 24 is arranged around the common magnetic part 23 and a second magnetic gap is formed between them. The vibration system 30 is connected to the housing 10 and includes a diaphragm 31 and a first voice coil 32 and a second voice coil 33 connected to the diaphragm 31. The first voice coil 32 is located in the first magnetic gap, and the second voice coil 33 is located in the second magnetic gap. The common magnetic part 23 includes a common magnet 231, a common magnetic guide plate 232, and an auxiliary magnet 233 stacked sequentially on the magnetic yoke 21 along the vibration direction of the diaphragm 31. The common magnet 231 and the auxiliary magnet 233 are both magnetized along the vibration direction of the diaphragm 31, but in opposite directions.

[0041] In this embodiment, the outer shell 10 is used to support and fix the vibration system 30 and the magnetic circuit system 20. The outer shell 10 can be made of metal, plastic, or a combination of metal and plastic parts. When the outer shell 10 is made of metal, the magnetic circuit system 20 can be bonded or welded to the outer shell 10, or the outer shell 10 and the magnetic circuit system 20 can be integrally formed. When the outer shell 10 is made of plastic, the outer shell 10 and the magnetic circuit system 20 are formed separately. Some magnetic components of the magnetic circuit system 20 can be injection molded to the outer shell 10, and the remaining magnetic components can be further bonded, etc., without limitation.

[0042] The magnetic circuit system 20 includes a magnetic yoke 21, a central magnetic portion 22, a common magnetic portion 23, and a side magnetic portion 24 spaced apart on the magnetic yoke 21. The magnetic circuit system 20 is fixed to the housing 10 by connecting the side magnetic portion 24. In the magnetic circuit system 20, the common magnetic portion 23 is arranged around the central magnetic portion 22, forming a first magnetic gap between them. The side magnetic portion 24 is arranged around the common magnetic portion 23, forming a second magnetic gap between them. That is, the second magnetic gap is arranged around the first magnetic gap. The vibration system 30 is configured as a diaphragm 31 and a first voice coil 32 and a second voice coil 33 connected to the diaphragm 31, such that the first voice coil 32 of the vibration system 30 is correspondingly arranged with the first magnetic gap, and the second voice coil 33 is correspondingly arranged with the second magnetic gap, forming an inner and outer double voice coil structure.

[0043] In this embodiment, one end of the first voice coil 32 and the second voice coil 33 are connected to the diaphragm 31, and the other ends of the first voice coil 32 and the second voice coil 33 are respectively suspended in the first magnetic gap and the second magnetic gap. By passing current through the first voice coil 32 and the second voice coil 33, the first voice coil 32 and the second voice coil 33 transfer electrical energy to the first magnetic gap and the second magnetic gap of the magnetic circuit system 20, so that the magnetic field generated by the magnetic circuit system 20 converts electrical energy into mechanical energy, thereby causing the first voice coil 32 and the second voice coil 33 to vibrate, and at the same time driving the diaphragm 31 to vibrate and produce sound, further converting mechanical energy into sound energy.

[0044] Understandably, after receiving a changing AC signal from the outside, the first voice coil 32, positioned within the first magnetic gap, reciprocates and cuts magnetic lines of force under the drive of the magnetic field force of the magnetic circuit system 20, causing the diaphragm 31 of the vibration system 30 to vibrate and produce sound. Simultaneously, after receiving the transmitted AC signal, the second voice coil 33 fully utilizes the magnetic field force of the magnetic circuit system 20 at the second magnetic gap to reciprocate and cut magnetic lines of force, thereby fully utilizing the magnetic field of the magnetic circuit system 20. This allows the first and second voice coils 32 and 33 to work together to increase the driving force on the diaphragm 31, effectively increasing the BL value of the sound-producing device 100 and improving the vibration effect of the diaphragm 31.

[0045] The common magnetic section 23 includes a common magnet 231, a common magnetic guide plate 232, and an auxiliary magnet 233, which are sequentially stacked on the magnetic yoke 21 along the vibration direction. Both the common magnet 231 and the auxiliary magnet 233 are magnetized along the vibration direction of the diaphragm 31, but in opposite directions. By providing the auxiliary magnet 233 on the common magnetic guide plate 232, the number of magnetic field lines passing through the two magnetic gaps can be further increased, enhancing the magnetic field strength of the two magnetic gaps, increasing the driving force of the magnetic circuit system 20 on the voice coil, and further improving the loudness and sensitivity of the miniature loudspeaker. Optionally, the ends of the auxiliary magnet 233 and the common magnet 231 closest to the common magnetic guide plate 232 are both N poles.

[0046] This embodiment of the invention connects the magnetic circuit system 20 to the outer shell 10, and connects the periphery of the diaphragm 31 of the vibration system 30 to the outer shell 10, thereby integrating and fixing the magnetic circuit system 20 and the vibration system 30 onto the outer shell 10. Simultaneously, by configuring the magnetic circuit system 20 as a magnetic yoke 21 and providing a central magnetic part 22, a common magnetic part 23, and a side magnetic part 24 on the magnetic yoke 21, with the common magnetic part 23 located outside the central magnetic part 22 and spaced apart to form a first magnetic gap, and the side magnetic part 24 located outside the common magnetic part 23 and spaced apart to form a second magnetic gap, the first voice coil 32 of the vibration system 30 is correspondingly positioned with the first magnetic gap, and the second voice coil 33 is correspondingly positioned with the second magnetic gap, forming an inner and outer double voice coil structure. Thus, in the second... Current is passed through the voice coil 32 and the second voice coil 33, causing the two voice coils to vibrate within the magnetic fields of the first and second magnetic gaps formed by the magnetic circuit system 20, respectively, and driving the diaphragm 31 to vibrate and produce sound, thereby increasing the BL value. Furthermore, by setting the common magnetic part 23 as a stacked common magnet 231, a common magnetic guide plate 232, and an auxiliary magnet 233, and by magnetizing the common magnet 231 and the auxiliary magnet 233 along the vibration direction of the diaphragm 31 and in opposite directions, the common magnetic part 23 is shared by the central magnetic part 22 and the side magnetic part 24, forming two magnetic gaps arranged inside and outside, thereby further increasing the magnetic field strength of the two magnetic gaps, improving the magnetic energy utilization rate of the magnetic circuit system 20, thereby improving the loudness and sensitivity of the sound-producing device 100, and improving product performance.

[0047] In some embodiments, the central magnetic part 22 includes a central magnet 221 and a central magnetic guide plate 222 sequentially stacked on the magnetic yoke 21 along the vibration direction, and the side magnetic part 24 includes a side magnet 241 and a side magnetic guide plate 242 sequentially stacked on the magnetic yoke 21 along the vibration direction. The magnetization direction of the side magnet 241 is opposite to the magnetization direction of the common magnet 231, and the magnetization direction of the central magnet 221 is opposite to the magnetization direction of the common magnet 231. A first magnetic gap is formed between the central magnetic guide plate 222 and the common magnetic guide plate 232, and a second magnetic gap is formed between the common magnetic guide plate 232 and the side magnetic guide plate 242.

[0048] Understandably, the central magnet 221 and the central magnetic guide plate 222 are stacked on the magnetic yoke 21 along the vibration direction of the diaphragm 31, and the side magnet 241 and the side magnetic guide plate 242 are stacked on the magnetic yoke 21 along the vibration direction of the diaphragm 31.

[0049] In this embodiment, the central magnet 221, the common magnet 231, and the side magnet 241 are all magnetized along the vibration direction of the diaphragm 31. The central magnet 221 and the side magnet 241 are magnetized in the same direction, while the central magnet 221 and the common magnet 231 are magnetized in opposite directions. With this configuration, the voice coil assembly vibrates under force in the magnetic gap, thereby driving the diaphragm 31 to vibrate and produce sound.

[0050] In some embodiments, the diaphragm 31 includes a first fixing part 311, a first folded ring 312, a first vibrating part 313, a second folded ring 314, a second fixing part 315, a third folded ring 316, and a second vibrating part 317 connected sequentially from the outside to the inside, wherein the first fixing part 311 is connected to the outer shell 10, and the second fixing part 315 is connected to the auxiliary magnet 233.

[0051] In this embodiment, the diaphragm 31 is approximately circular and is connected to the outer shell 10 and the auxiliary magnet 233 respectively via the first fixing part 311 and the second fixing part 315, thereby improving the vibration stability of the first vibrating part 313 and the second vibrating part 317. The first fixing part 311 can be injection molded or hot-pressed to the outer shell 10 to improve the bonding stability between the diaphragm 31 and the outer shell 10. The first voice coil 32 and the second voice coil 33 are respectively connected to the first vibrating part 313 and the second vibrating part 317.

[0052] In some embodiments, the vibration system 30 further includes a frame 34, which includes an inner ring frame 341, an outer ring frame 342, and a connecting frame 343 connecting the inner ring frame 341 and the outer ring frame 342. The inner ring frame 341 connects the second vibrating part 317 and the first voice coil 32, and the outer ring frame 342 connects the first vibrating part 313 and the second voice coil 33. The connecting frame 343 includes two frames, and the common magnet 23 has a first gap 20a to avoid the connecting frame.

[0053] Specifically, both the inner ring skeleton 341 and the outer ring skeleton 342 are narrow ring structures. The inner ring skeleton 341 corresponds to the first magnetic gap, the outer ring skeleton 342 corresponds to the second magnetic gap, and the connecting skeleton 343 corresponds to the first gap 20a of the magnetic circuit system 20. This can prevent the diaphragm 31 from interfering with the magnetic circuit system 20 when it vibrates, thereby ensuring the reliability of the sound generating device 100.

[0054] By setting the skeleton 34, the first voice coil 32 and the second voice coil 33 can be connected to the diaphragm 31 through the skeleton 34. This ensures that the first voice coil 32 and the second voice coil 33 are in a more reasonable magnetic field, that is, the region with the largest magnetic flux density, thereby effectively improving the BL value.

[0055] In some embodiments, the vibration system 30 further includes a flexible printed circuit board 35, which includes an inner ring circuit board 351, a middle circuit board 352, an outer ring circuit board 353, an inner connecting portion 354, and an outer connecting portion 355. The inner ring circuit board 351, the middle circuit board 352, and the outer ring circuit board 353 are nested sequentially from the inside to the outside. The inner ring circuit board 351 is connected between the inner ring frame 341 and the first voice coil 32, the middle circuit board 352 is connected between the outer ring frame 342 and the second voice coil 33, and the outer ring circuit board 353 is connected between the first fixing portion 311 and the outer shell 10. There are two inner connecting portions 354, which are respectively connected to the two connecting frames 343 and are connected between the inner ring circuit board 351 and the middle circuit board 352. There are four outer connecting portions 355, which are connected between the middle circuit board 352 and the outer ring circuit board 353. The side magnet portion 24 has a second gap 20b to avoid the outer connecting portions 355.

[0056] The inner ring circuit board 351 of the flexible printed circuit board 35 corresponds to the first magnetic gap and is electrically connected to the two leads of the first voice coil 32. The middle circuit board 352 corresponds to the second magnetic gap and is electrically connected to the two leads of the second voice coil 33. The inner connecting part 354 corresponds to the first gap 20a between the common magnetic part 23, and the outer connecting part 355 corresponds to the second gap 20b between the side magnetic part 24. The inner ring circuit board 351 and the middle circuit board 352 are connected to the same circuit through the inner connecting part 354 and the outer connecting part 355, and are electrically connected to the external power line through the outer ring circuit board 353. In this way, not only is the electrical connection between the first voice coil 32 and the second voice coil 33 and the external power supply realized, but also the interference between the diaphragm 31 and the magnetic circuit system 20 when the diaphragm 31 vibrates can be avoided, thereby ensuring the reliability of the sound generating device 100.

[0057] In this embodiment, by setting a first gap 20a and a second gap 20b in the magnetic circuit system 20, the skeleton 34, the flexible printed circuit board 35 and the magnetic circuit system 20 can be avoided, thereby achieving the above-mentioned functions without increasing the overall height of the sound-generating device 100.

[0058] In some embodiments, the central magnetic part 22 may be a rectangular or circular structure, and the shared magnetic part 23 may be arranged around the central magnetic part 22. Optionally, the shared magnetic part 23 may be a closed, integral annular structure, with the annular shared magnetic part 23 surrounding the central magnetic part 22 and spaced apart from the central magnetic part 22 to form an annular first magnetic gap. Optionally, the shared magnetic part 23 may be in the form of a circular ring or a rectangular ring, etc. Of course, there may be multiple shared magnetic parts 23, with multiple shared magnetic parts 23 arranged around the central magnetic part 22, and adjacent shared magnetic parts 23 connected end to end to form a closed annular structure; or, there may be multiple shared magnetic parts 23, with multiple shared magnetic parts 23 spaced apart and arranged around the central magnetic part 22, with gaps between adjacent shared magnetic parts 23, which may be clearance notches to provide clearance space for the frame 34, and are not limited here.

[0059] In one embodiment, the edge magnetic portion 24 forms a closed, integral ring structure. The annular edge magnetic portion 24 surrounds the common magnetic portion 23 and is spaced apart from the common magnetic portion 23 to form an annular second magnetic gap. Optionally, the edge magnetic portion 24 can be circular or rectangular, etc. Of course, there are multiple edge magnetic portions 24, with adjacent edge magnetic portions 24 connected end to end to form a closed ring structure; or, there are multiple edge magnetic portions 24, which are spaced apart and arranged around the common magnetic portion 23, with gaps between adjacent edge magnetic portions 24 to provide clearance space for the flexible printed circuit board 35, which is not limited here.

[0060] Optionally, in this embodiment, the central magnetic part 22 has a circular structure, and there are two common magnetic parts 23. The two common magnetic parts 23 are spaced apart and arranged around the central magnetic part 22, and there is a first gap 20a between adjacent common magnetic parts 23. There are four side magnetic parts 24. The four side magnetic parts 24 are spaced apart and arranged around the common magnetic part 23, and there is a second gap 20b between adjacent side magnetic parts 24. Furthermore, the two second gaps 20b and the first gaps 20a are arranged correspondingly in the radial direction of the central magnetic part 22, which helps to exchange the two magnetic gaps and the external airflow and balance the air pressure behind the diaphragm 31.

[0061] In some embodiments, both the second folded ring 314 and the third folded ring 316 include two, and each second folded ring 314 and the corresponding third folded ring 316 together form a contoured structure that is approximately the same as the outer contour of a corresponding common magnet 231. The second fixing part 315 is located within the contoured structure and is connected to the common magnet 23. In this way, the portion between adjacent contoured structures can be used as a vibrating part, further increasing the effective vibration area of ​​the diaphragm 31. At the same time, the first vibrating part 313 is directly connected to the second vibrating part 317, improving the vibration consistency of the two. On the other hand, the connecting frame 343 of the skeleton 34 can be directly connected to this part of the vibrating part, thereby improving the connection strength between the skeleton 34 and the diaphragm 31 and improving the connection reliability between the various structures.

[0062] In some embodiments, the vibration system 30 further includes a reinforcing plate 36, the outline of which is substantially the same as the outer outline of the first vibration part 313 and the second vibration part 317, and is connected to the side of the diaphragm 31 away from the magnetic circuit system 20.

[0063] In some embodiments, the two ends of the outer connecting portion 355 are respectively set at an angle to the line connecting the center of the flexible printed circuit board 35. This arrangement can increase the length of the outer connecting portion 355, increase the deformation range between the intermediate circuit board 352 and the outer ring circuit board 353, and reduce vibration interference to the first vibration portion 313 and the second vibration portion 317.

[0064] In some embodiments, both the second folding ring 314 and the third folding ring 316 are convex in a direction away from the magnetic circuit system 20. This avoids interference between the second folding ring 314 and the third folding ring 316 and the auxiliary magnet 233 and the housing 10 during vibration, thereby improving the reliability of the sound generating device 100.

[0065] A second aspect of this utility model also provides an acoustic device, which includes a housing and a sound-generating device 100 as described above, wherein the sound-generating device 100 is disposed within the housing. The specific structure of the sound-generating device 100 refers to the structure of the sound-generating device 100 in the foregoing embodiments. Since this acoustic device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sound-generating device, characterized in that, include: shell; A magnetic circuit system is connected to the housing and includes a yoke, a central magnetic part, a common magnetic part and a side magnetic part spaced apart from each other on the yoke. The common magnetic part is arranged around the central magnetic part and a first magnetic gap is formed between them. The side magnetic part is arranged around the common magnetic part and a second magnetic gap is formed between them. A vibration system, connected to the housing, includes a diaphragm and a first voice coil and a second voice coil connected to the diaphragm. The first voice coil is disposed in the first magnetic gap, and the second voice coil is disposed in the second magnetic gap. The common magnetic part includes a common magnet, a common magnetic plate and an auxiliary magnet stacked sequentially on the magnetic yoke along the vibration direction of the diaphragm. The common magnet and the auxiliary magnet are both magnetized along the vibration direction of the diaphragm but in opposite directions.

2. The sound-generating device according to claim 1, characterized in that, The central magnetic part includes a central magnet and a central magnetic plate sequentially stacked on the yoke along the vibration direction. The side magnetic part includes a side magnet and a side magnetic plate sequentially stacked on the yoke along the vibration direction. The magnetization direction of the side magnet is opposite to that of the common magnet. The magnetization direction of the central magnet is opposite to that of the common magnet. A first magnetic gap is formed between the central magnetic plate and the common magnetic plate. A second magnetic gap is formed between the common magnetic plate and the side magnetic plate.

3. The sound-generating device according to claim 2, characterized in that, The diaphragm includes a first fixing part, a first folded ring, a first vibrating part, a second folded ring, a second fixing part, a third folded ring, and a second vibrating part connected sequentially from the outside to the inside. The first fixing part is connected to the outer shell, and the second fixing part is connected to the auxiliary magnet.

4. The sound-generating device according to claim 3, characterized in that, The vibration system further includes a frame, which includes an inner ring frame, an outer ring frame, and a connecting frame connecting the inner ring frame and the outer ring frame. The inner ring frame connects the second vibrating part and the first voice coil, and the outer ring frame connects the first vibrating part and the second voice coil. The connecting frame includes two frames, and the common magnet has a first gap to avoid the connecting frame.

5. The sound-generating device according to claim 4, characterized in that, The vibration system further includes a flexible printed circuit board, which comprises an inner ring circuit board, a middle circuit board, an outer ring circuit board, an inner connecting portion, and an outer connecting portion. The inner ring circuit board, the middle circuit board, and the outer ring circuit board are nested sequentially from the inside to the outside. The inner ring circuit board is connected between the inner ring skeleton and the first voice coil, the middle circuit board is connected between the outer ring skeleton and the second voice coil, and the outer ring circuit board is connected between the first fixing portion and the outer shell. The inner connecting portion comprises two portions and is disposed corresponding to the connecting skeleton, and the inner connecting portion is connected between the inner ring circuit board and the middle circuit board. The outer connecting portion comprises four portions and is connected between the middle circuit board and the outer ring circuit board. The side magnet portion has a second gap to avoid the outer connecting portion.

6. The sound-generating device according to claim 5, characterized in that, The central magnetic part is circular; the shared magnetic part is arc-shaped and includes two parts, with the first gap formed between adjacent shared magnetic parts; the side magnetic parts are arc-shaped and include four parts, with the second gap formed between adjacent side magnetic parts.

7. The sound-generating device according to claim 5 or 6, characterized in that, The second fold and the third fold each include two, and each second fold and the corresponding third fold together form a contoured structure that is approximately the same as the outer contour of the corresponding common magnet. The second fixing part is located within the contoured structure and is connected to the common magnet.

8. The sound-generating device according to claim 5, characterized in that, The two ends of the external connection portion are respectively set at an angle to the line connecting the center of the flexible printed circuit board.

9. The sound-generating device according to claim 3, characterized in that, Both the second and third folded rings are convex in a direction away from the magnetic circuit system.

10. An acoustic device, characterized in that, The acoustic device includes a housing and a sound-generating device as described in any one of claims 1-9.

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