Sound production device and electronic device

Abstract

This utility model belongs to the field of electroacoustic conversion technology and relates to a sound-generating device and electronic device. The sound-generating device includes a centering assembly, which includes two centering supports respectively disposed on both sides of a second direction of the magnetic circuit system. The second direction is perpendicular to the first direction. Each centering support includes an outer fixing part, an elastic part, and an inner fixing part. The elastic part is formed as a single elastic arm extending along the first direction to both ends of the magnetic circuit system. The outer fixing part is disposed at both ends of the elastic part along its length direction and is fixedly connected to the housing. The inner fixing part includes a connecting part extending along a third direction and a pad part extending along the second direction. The two ends of the connecting part are respectively connected to the elastic part and the pad part. The voice coil assembly is provided with a lead assembly. The pad parts are located on both sides of the voice coil assembly in the second direction. One side of the pad part is electrically connected to the lead assembly, and the other side is connected to the diaphragm assembly. The above structure is advantageous for increasing the volume of the magnetic circuit system without changing the volume of the sound-generating device, thereby improving the acoustic performance of the sound-generating device.

Description

Technical Field

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

[0002] With the development of science and technology, portable electronic products, such as mobile phones, handheld game consoles, navigation devices, or handheld multimedia entertainment devices, are widely used in people's daily lives. Among these mobile electronic devices, the sound-generating device used for voice playback is an essential component. As users pursue higher voice quality, the requirements for the sound-generating device are also getting higher and higher.

[0003] The sound-generating device includes a frame, a vibration system fixed to the frame, and a magnetic circuit system that drives the vibration system. The device also incorporates a double-vibrating-arm support structure or a four-corner support structure within the frame to connect the voice coil to an external power source. However, the four-corner support structure or the double-vibrating-arm support structure occupies space along the long axis or at the corners of the magnetic circuit system, thus reducing the volume of the magnets within the system and consequently causing performance loss.

[0004] Therefore, in view of the above shortcomings, this utility model is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a sound-generating device and an electronic device to at least partially solve the above-mentioned technical problems.

[0006] The first aspect of this utility model provides a sound-generating device, comprising:

[0007] case;

[0008] A magnetic circuit system connected to the housing, the magnetic circuit system having a first magnetic gap and a second magnetic gap arranged side by side along a first direction;

[0009] A vibration system includes a diaphragm assembly, a voice coil assembly, and a centering assembly. The diaphragm assembly is disposed on one side of the magnetic circuit system and its outer periphery is fixed to the housing. The voice coil assembly includes a first voice coil and a second voice coil arranged side by side. One end of the first voice coil is connected to the diaphragm assembly, and the other end of the first voice coil is correspondingly disposed to a first magnetic gap. One end of the second voice coil is connected to the diaphragm assembly, and the other end of the second voice coil is correspondingly disposed to a second magnetic gap. The centering assembly includes two centering supports respectively disposed on both sides of a second direction perpendicular to the first direction of the magnetic circuit system. The centering supports include an outer fixing portion. The system comprises an elastic portion and an inner fixing portion. The elastic portion is formed as a single elastic arm extending along the first direction to both ends of the magnetic circuit system. The outer fixing portion is disposed at both ends of the elastic portion along its length direction and is fixedly connected to the housing. The inner fixing portion includes a connecting portion extending along a third direction and a pad portion extending along a second direction. The third direction is perpendicular to the first direction and the second direction, respectively. Both ends of the connecting portion are connected to the elastic portion and the pad portion, respectively. The voice coil assembly is provided with a lead assembly. The pad portion is located on both sides of the voice coil assembly in the second direction. One side of the pad portion is electrically connected to the lead assembly, and the other side of the pad portion is connected to the diaphragm assembly.

[0010] The sound-generating device provided by this utility model may also have the following additional technical features:

[0011] In some embodiments of this utility model, the magnetic circuit system includes a central magnetic part and a side magnetic part disposed on the outer periphery of the central magnetic part. The central magnetic part includes a first magnetic part, a second magnetic part and a third magnetic part arranged side by side along the first direction. The first magnetic part, the second magnetic part and the side magnetic part together define the first magnetic gap, and the third magnetic part, the second magnetic part and the side magnetic part together define the second magnetic gap.

[0012] In some embodiments of this utility model, the side magnetic portion consists of two side magnetic portions disposed on both sides of the central magnetic portion in the first direction. The side magnetic portion includes a first extension portion extending along the second direction and two second extension portions extending along the first direction. The two second extension portions are located at both ends of the length direction of the first extension portion. One end of the second extension portion is connected to the first extension portion, and the other end of the second extension portion extends along the first direction toward the side closer to the central magnetic portion.

[0013] In some embodiments of this utility model, the first voice coil has a first connecting edge extending along the first direction, the length of the first connecting edge is L1, and the extension length of the second extension portion along the first direction is L2, 0.5≤L2 / L1<1.

[0014] And / or, the connection between the first extension and the second extension is provided with an angled portion, and along the second direction, the angled portion extends obliquely toward the side closer to the central magnet, and the two ends of the elastic portion are respectively provided with an inclined portion consistent with the outline of the angled portion.

[0015] In some embodiments of this utility model, the first magnetic part and the third magnetic part have the same outer contour, and along the second direction, the extension length of the second magnetic part is greater than the extension length of the first magnetic part and the third magnetic part.

[0016] In some embodiments of this utility model, the lead wire assembly of the voice coil assembly is disposed on the side of the voice coil assembly near the second magnet and leads out along the second direction. The second magnet includes a body and end portions disposed at both ends of the body in the second direction. The width of the end portions is smaller than the width of the body, and the end portions and the body of the voice coil assembly define the lead wire outlet space of the lead wire assembly.

[0017] In some embodiments of this utility model, the side magnetic part includes a side magnet and a side magnetic guide plate disposed on the side of the side magnet facing the diaphragm assembly, and the housing includes a ring-shaped metal part, the metal part and the side magnetic guide plate being formed as an integral molded part.

[0018] In some embodiments of this utility model, the housing further includes two plastic parts respectively disposed on both sides of the first direction of the magnetic circuit system, and the two plastic parts are integrally injection molded with the metal part.

[0019] In some embodiments of this utility model, the diaphragm assembly includes a diaphragm and a vibrating plate. The outer periphery of the diaphragm is fixed to the housing. The vibrating plate is connected to the diaphragm. The vibrating plate includes a main body and support legs disposed on both sides of the main body in the second direction. The voice coil assembly is connected to the main body. One end of the support leg is connected to the main body, and the other end of the support leg extends along the third direction. The support leg is located outside the connecting portion, and the end of the support leg away from the main body is fixed to the elastic portion.

[0020] A second aspect of this invention also provides an electronic device, including the sound-generating device described in any one of the above descriptions.

[0021] The sound-generating device provided by this utility model includes a housing, a vibration system housed within the housing, and a magnetic circuit system. The magnetic circuit system forms a first magnetic gap and a second magnetic gap arranged side-by-side along a first direction. The vibration system forms a diaphragm assembly and a voice coil assembly connected to the diaphragm assembly. The first and second voice coils in the voice coil assembly are respectively configured to correspond one-to-one with the first and second magnetic gaps. Thus, when energized, the first and second voice coils can vibrate under the drive of the magnetic fields of the first and second magnetic gaps, thereby driving the diaphragm assembly to vibrate and generate sound. By setting multiple voice coils, the multiple voice coils can synchronously drive the diaphragm assembly to vibrate and generate sound, which can improve the sound-generating sensitivity of the device. The sound-generating device also includes a centering assembly comprising two centering supports. Each centering support includes an outer fixing part, an elastic part, and an inner fixing part. Since the elastic part of the centering support is formed as a single elastic arm in the shape of a strip, it has a relatively small width in the second direction. Therefore, with roughly the same volume, compared to a sound-generating device using a multi-vibrating-arm centering support, the sound-generating device using the centering support of this invention can save at least 0.4 mm in the second direction. This is beneficial for increasing the magnet volume of the magnetic circuit system, improving the BL value of the product, and thus effectively improving the acoustic performance of the sound-generating device. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figures 1-2 These are three-dimensional structural diagrams of the sound-generating device of this utility model from different perspectives;

[0024] Figure 3 This is an exploded view of the structure of the sound-generating device of this utility model;

[0025] Figure 4 This is a front view of the sound-generating device of this utility model;

[0026] Figure 5-6 They are respectively Figure 4 Cross-sectional view along the AA and BB directions;

[0027] Figure 7 This is a three-dimensional structural diagram of some components of the sound-generating device of this utility model;

[0028] Figure 8 This is a schematic diagram showing the connection between the voice coil assembly and the centering assembly in the sound-generating device of this utility model;

[0029] Figure 9 This is a partial structural diagram of the magnetic circuit system in the sound-generating device of this utility model;

[0030] Figure 10 This is a schematic diagram showing the coordination of the centering component and the magnetic circuit system in the sound-generating device of this utility model;

[0031] Figure 11 This is a schematic diagram of the structure of the variable magnetic plate and the metal part in an embodiment of this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100 - Sound-generating device;

[0034] 10-Shell, 11-Metal part, 12-Plastic part, 13-Steel mesh;

[0035] 20-Magnetic circuit system, 21-Magnetic yoke, 22-Central magnetic part, 23-First magnetic part, 231-First magnet, 232-First magnetic plate, 24-Second magnetic part, 241-Second magnet, 242-Second magnetic plate, 243-Body part, 244-End, 25-Third magnetic part, 251-Third magnet, 252-Third magnetic plate, 26-Side magnetic part, 261-Side magnet, 262-Side magnetic plate, 263-Main magnetic part, 264-First extension, 265-Second extension, 266-Angled part, 27-First magnetic gap, 28-Second magnetic gap;

[0036] 30-Vibration system, 31-Diaphragm assembly, 311-Diaphragm, 312-Vibrating plate, 313-Main body, 314-Support, 32-Voice coil assembly, 321-First voice coil, 322-Second voice coil, 33-Centering support, 331-External fixing part, 332-Elastic part, 333-Internal fixing part, 334-Connecting part, 335-Solder pad part, 336-Inclined part. Detailed Implementation

[0037] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Reference Figures 1-11The first aspect of this utility model provides 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 has a first magnetic gap 27 and a second magnetic gap 28 arranged side-by-side along a first direction. The vibration system 30 includes a diaphragm assembly 31, a voice coil assembly 32, and a centering assembly. The diaphragm assembly 31 is disposed on one side of the magnetic circuit system 20 and its outer periphery is fixed to the housing 10. The voice coil assembly 32 includes a first voice coil 321 and a second voice coil 322 arranged side-by-side. One end of the first voice coil 321 is connected to the diaphragm assembly 31, and the other end of the first voice coil 321 is correspondingly disposed with respect to the first magnetic gap 27. One end of the second voice coil 322 is connected to the diaphragm assembly 31, and the other end of the second voice coil 322 is correspondingly disposed with respect to the second magnetic gap 28. The centering assembly includes components respectively disposed in the magnetic circuit system... Two centering supports 33 on both sides of the second direction of the magnetic circuit system 20 are provided. The second direction is perpendicular to the first direction. The centering supports 33 include an outer fixing part 331, an elastic part 332 and an inner fixing part 333. The elastic part 332 is formed as a single elastic arm extending along the first direction to both ends of the magnetic circuit system 20. The outer fixing part 331 is provided at both ends of the elastic part 332 in the length direction and is fixedly connected to the housing 10. The inner fixing part 333 includes a connecting part 334 extending along a third direction and a pad part 335 extending along the second direction. The third direction is perpendicular to the first direction and the second direction, respectively. The two ends of the connecting part 334 are connected to the elastic part 332 and the pad part 335, respectively. The voice coil assembly 32 is provided with a lead wire assembly. The pad part 335 is located on both sides of the voice coil assembly 32 in the second direction. One side of the pad part 335 is electrically connected to the lead wire assembly, and the other side of the pad part 335 is connected to the diaphragm assembly 31.

[0042] Specifically, the housing 10 is formed as a hollow frame structure. Optionally, the housing 10 is formed as a rectangular frame, with its minor axis direction (i.e., the width direction) as a first direction, its major axis direction (i.e., the long axis direction) as a second direction, and its thickness direction (i.e., the vertical direction) as a third direction. The first direction, the second direction, and the third direction are arranged perpendicularly to each other. Along the axial direction of the housing 10 (i.e., the third direction), it has a first side surface and a second side surface arranged opposite to each other.

[0043] The magnetic circuit system 20 is connected to the first side of the housing 10, and the magnetic circuit system 20 forms a first magnetic gap 27 and a second magnetic gap 28 in the second side. The first magnetic gap 27 and the second magnetic gap 28 are arranged side by side along the first direction and are used to form a magnetic field.

[0044] The vibration system 30 includes a diaphragm assembly 31 and a voice coil assembly 32. The outer periphery of the diaphragm assembly 31 is connected to the second side of the housing 10. The voice coil assembly 32 is disposed between the diaphragm assembly 31 and the magnetic circuit system 20, and includes a first voice coil 321 and a second voice coil 322 arranged side by side along a first direction. One end of the first voice coil 321 and the second voice coil 322 is connected to the diaphragm assembly 31, and the other end is respectively corresponding to the first magnetic gap 27 and the second magnetic gap 28. Thus, when energized, the first voice coil 321 and the second voice coil 322 can vibrate under the drive of the magnetic fields of the first magnetic gap 27 and the second magnetic gap 28, thereby driving the diaphragm assembly 31 connected to them to vibrate and produce sound. By setting multiple voice coils, these multiple voice coils can synchronously drive the diaphragm assembly 31 to vibrate and produce sound, thereby improving the sound production sensitivity of the sound-producing device 100.

[0045] The vibration system 30 also includes a centering assembly, which includes two centering supports 33 disposed on both sides of the magnetic circuit system 20 in a second direction. Each centering support 33 includes an outer fixing portion 331, an elastic portion 332, and an inner fixing portion 333. The elastic portion 332 is formed as a single elastic arm that is generally strip-shaped and extends along the first direction to both ends of the magnetic circuit system 20. The outer fixing portion 331 is disposed at both ends of the elastic portion 332 in the length direction and is fixedly connected to the first side of the housing 10. The inner fixing portion 333 includes a connecting portion 334 and a pad portion 335. One end of the connecting portion 334 is connected to the elastic portion 332, and the other end extends along the third direction toward the direction close to the diaphragm assembly 31. The pad portion 335 is connected to the other end of the connecting portion 334 opposite to the elastic portion 332 and extends along the second direction toward the voice coil assembly 32. The opposite sides of the pad portion 335 are respectively connected to the lead assemblies of the diaphragm assembly 31 and the voice coil assembly 32. In other words, the diaphragm assembly 31 and the lead assembly are respectively connected to the surfaces of two different sides of the pad portion 335.

[0046] It should be noted that the lead assembly of the voice coil assembly 32 includes two first leads disposed on the first voice coil 321 and two second leads disposed on the second voice coil 322. Each centering support 33 has two pads on its pad portion 335, and the two pads of the same centering support 33 are electrically connected to one first lead and one second lead, respectively. Each of the two outer fixing portions 331 of one of the centering support 33 is also provided with an electrical connection portion 334. The two electrical connection portions 334 are respectively electrically connected to the two pads in the pad portion 335, so that an external power supply can be electrically connected to the voice coil assembly 32 through the two electrical connection portions 334, thereby supplying power to the voice coil assembly 32.

[0047] Meanwhile, since the centering support 33 is also connected to the diaphragm assembly 31, the polarization of the vibration system 30 can be reduced by the centering support 33, thereby improving the vibration stability of the vibration system 30.

[0048] Furthermore, since the elastic portion 332 of the centering support 33 is formed as a single elastic arm in the shape of a strip, and thus has a relatively small width in the second direction, under the condition of approximately the same volume, compared with the sound generating device 100 using a multi-vibrating arm centering support 33, the sound generating device 100 using the centering support 33 in this embodiment can save at least 0.4 mm in the second direction, which is beneficial to increase the magnet volume of the magnetic circuit system 20, improve the product BL value, and thus effectively improve the acoustic performance of the sound generating device 100.

[0049] The sound-generating device 100 provided in this embodiment includes a housing 10, a vibration system 30 housed in the housing 10, and a magnetic circuit system 20. The magnetic circuit system 20 forms a first magnetic gap 27 and a second magnetic gap 28 arranged side-by-side along a first direction. The vibration system 30 forms a diaphragm assembly 31 and a voice coil assembly 32 connected to the diaphragm assembly 31. The first voice coil 321 and the second voice coil 322 in the voice coil assembly 32 are respectively corresponding to the first magnetic gap 27 and the second magnetic gap 28. Thus, when energized, the first voice coil 321 and the second voice coil 322 can vibrate under the magnetic field drive of the first magnetic gap 27 and the second magnetic gap 28, thereby driving the diaphragm assembly 31 to vibrate and generate sound. By setting multiple voice coils, multiple voice coils can synchronously drive the diaphragm assembly 31 to vibrate and generate sound, which can improve the sound-generating sensitivity of the sound-generating device 100. The sound-generating device 100 also includes a centering assembly comprising two centering supports 33. This allows the centering supports 33 to power the voice coil assembly 32 and also improve the operational stability of the vibration system 30. The centering support 33 includes an outer fixing portion 331, an elastic portion 332, and an inner fixing portion 333. Since the elastic portion 332 of the centering support 33 is formed as a single, strip-shaped elastic arm, it has a relatively small width in the second direction. Therefore, with approximately the same volume, compared to a sound-generating device 100 using multiple vibrating arm centering supports 33, the sound-generating device 100 using the centering support 33 in this embodiment can save at least 0.4 mm in the second direction. This is beneficial for increasing the magnet volume of the magnetic circuit system 20, improving the product's BL value, and thus effectively improving the acoustic performance of the sound-generating device 100.

[0050] In some embodiments, the magnetic circuit system 20 includes a central magnetic part 22 and a side magnetic part 26 disposed around the central magnetic part 22. The central magnetic part 22 includes a first magnetic part 23, a second magnetic part 24 and a third magnetic part 25 arranged side by side along a first direction. The first magnetic part 23, the second magnetic part 24 and the side magnetic part 26 together define a first magnetic gap 27, and the third magnetic part 25, the second magnetic part 24 and the side magnetic part 26 together define a second magnetic gap 28.

[0051] Specifically, the magnetic circuit system 20 also includes a magnetic yoke 21, which can be formed as a flat plate structure and connected to the first side of the housing 10. The central magnetic part 22 and the side magnetic part 26 are both connected to the side of the magnetic yoke 21 facing the diaphragm assembly 31, so as to form a first magnetic gap 27 and a second magnetic gap 28.

[0052] Optionally, grooves corresponding to the first magnetic gap 27 and the second magnetic gap 28 are formed on the side of the magnetic yoke 21 facing the diaphragm assembly 31. This can help increase the height of the first magnetic gap 27 and the second magnetic gap 28 along the third direction, meet the large amplitude requirements of the vibration system 30, and help avoid the vibration of the first voice coil 321 and the second voice coil 322 impacting the magnetic yoke 21, thereby improving the reliability of the sound generating device 100.

[0053] In some embodiments, two side magnetic portions 26 are disposed on both sides of the central magnetic portion 22 in a first direction. Each side magnetic portion 26 includes a first extension 264 extending in a second direction and two second extensions 265 extending in the first direction. The two second extensions 265 are located at both ends of the first extension 264 along its length. One end of each second extension 265 is connected to the first extension 264, and the other end extends in the first direction towards the side closer to the central magnetic portion 22. Based on this configuration, the side magnetic portions 26 are generally U-shaped. This increases the circumferential magnet length of the first magnetic gap 27 and the second magnetic gap 28, thereby increasing the effective length of the magnetic field lines cut by the voice coil conductors in the first voice coil 321 and the second voice coil 322, thus improving the BL value of the sound-generating device 100 and enhancing its acoustic performance. Furthermore, since there are two side magnetic portions 26, the structure of the magnetic circuit system 20 is relatively simple, facilitating assembly.

[0054] In some embodiments, the first voice coil 321 has a first connecting edge extending along a first direction, the length of the first connecting edge being L1, and the second extension 265 extending along the first direction having a length of L2, where 0.5 ≤ L2 / L1 < 1.

[0055] It should be noted that the length of the second extension 265 cannot be too short, otherwise it will affect the magnetic field strength of the first magnetic gap 27; however, it also cannot be too long, otherwise it will interfere with the lead wire of the first voice coil 321, thereby affecting the function of the sound-generating device 100. Optionally, the ratio of the length of the second extension 265 along the first direction to the first connecting side is 0.5, 0.6, 0.7, 0.8, or 0.9. Correspondingly, the two side magnetic parts 26 are symmetrically arranged, that is, the other side magnetic part 26 can also avoid interfering with the lead wire of the second voice coil 322 while ensuring the magnetic field strength of the second magnetic gap 28.

[0056] This embodiment, through the above-mentioned settings, does not affect the mutual cooperation of different structures in the sound-generating device 100, and can improve the BL value of the sound-generating device 100, thereby improving the acoustic performance of the sound-generating device 100.

[0057] In some embodiments, a chamfered portion 266 is provided at the connection between the first extension 264 and the second extension 265. Along the second direction, the chamfered portion 266 extends obliquely toward the side closer to the central magnetic portion 22. The two ends of the elastic portion 332 are respectively provided with an inclined portion 336 that is consistent with the contour of the chamfered portion 266.

[0058] Specifically, the side of the connection between the first extension 264 and the second extension 265 away from the voice coil assembly 32 has a triangular notch, which is formed as an oblique portion 266. The two ends of the elastic portion 332 are provided with inclined portions 336 that conform to the contour of the oblique portion 266, thereby further increasing the length of the elastic portion 332, thereby improving the deformation capability of the centering support 33, which in turn helps to improve the low-frequency performance of the sound generating device 100, improve the reliability of the sound generating device 100, and thus improve the overall performance of the sound generating device 100.

[0059] Meanwhile, the widths of the first extension 264 and the second extension 265 are both smaller than the width of the main body of the side magnet 26. This allows space to be freed up at the four corners of the side magnet 26 for the centering support plate 33, which helps to optimize the structure of the centering support plate 33 and improve the reliability of the sound generating device 100.

[0060] In some embodiments, the first magnetic part 23 and the third magnetic part 25 have the same external outline, and along the second direction, the extension length of the second magnetic part 24 is greater than the extension length of the first magnetic part 23 and the third magnetic part 25.

[0061] Specifically, the second magnetic part 24 is located between the first voice coil 321 and the second voice coil 322. That is, the two ends of the second magnetic part 24 along the second direction are not fitted with voice coils. This allows for an appropriate increase in the length of the second magnetic part 24 along the second direction, making its extension length along the second direction greater than that of the first magnetic part 23 and the third magnetic part 25. This arrangement, through reasonable space allocation, increases the volume of the central magnetic part 22, thereby improving the BL value of the sound-generating device 100 and enhancing its acoustic performance.

[0062] In some embodiments, the lead assembly of the voice coil assembly 32 is disposed on the side of the voice coil assembly 32 near the second magnet 24 and leads out along the second direction. The second magnet 24 includes a body 243 and end portions 244 disposed at both ends of the body 243 in the second direction. The width of the end portions 244 is smaller than the width of the body 243. The end portions 244 and the body of the voice coil assembly 32 define the lead space for the lead assembly.

[0063] In this embodiment, by positioning the lead assembly of the voice coil assembly 32 close to the second magnetic part 24, it is advantageous to avoid the side magnetic part 26, thereby extending the length of the second extension part 265 along the first direction. This increases the magnet volume of the central magnetic part 22, thereby improving the BL value of the sound-generating device 100 and enhancing its acoustic performance. Simultaneously, this arrangement also facilitates concentrating the pad portion 335 of the centering support 33 towards the center position in the first direction, thus reducing the length of the pad portion 335 along the first direction. Furthermore, by reducing the width of the ends of the second magnetic part 24 along the second direction, sufficient space can be reserved for the lead wire to avoid the lead assembly of the voice coil assembly 32, preventing noise from collisions with the magnet during vibration, thereby improving the acoustic effect of the sound-generating device 100.

[0064] In some embodiments, the side magnet portion 26 includes a side magnet 261 and a side magnetic guide plate 262 disposed on the side of the side magnet 261 facing the diaphragm assembly 31, and the housing 10 includes an annularly arranged metal portion 11, which is integrally formed with the side magnetic guide plate 262.

[0065] Specifically, the side magnetic plate 262 is stacked on the side magnet 261 and forms an integral structure with the annular metal part 11 of the housing 10. This not only realizes the connection between the magnetic circuit system 20 and the housing 10, but also improves the connection strength between the metal part 11 and the side magnetic plate 262, and improves the processing efficiency of the metal part 11 and the side magnetic plate 262.

[0066] In the central magnetic part 22, the first magnetic part 23 includes a first magnet 231 and a first magnetic plate 232 that are stacked and have roughly the same outline, the second magnetic part 24 includes a second magnet 241 and a second magnetic plate 242 that are stacked and have roughly the same outline, and the third magnetic part 25 includes a third magnet 251 and a third magnetic plate 252 that are stacked and have roughly the same outline. The first magnet 231, the second magnet 241, and the third magnet 251 are connected side by side to the magnetic yoke 21 along the first direction.

[0067] In some embodiments, the housing 10 further includes two plastic portions 12 respectively disposed on both sides of the magnetic circuit system 20 in a first direction, the two plastic portions 12 being integrally injection molded with the metal portion 11.

[0068] Specifically, the metal part 11 is bent and extended from both ends in the second direction towards the second side to form a bent portion. The length of the bent portion in the first direction is less than the length of the metal part 11, and it is located at the center of the metal part 11. The width of the metal part 11 in the first direction is slightly less than the width of the housing 10 in the first direction, and both sides of the metal part 11 extending in the second direction are provided with a snap-fit ​​structure. The plastic part 12 is integrally injection molded with the metal part 11. After molding, the plastic part 12 and the snap-fit ​​structure of the metal part 11 engage to improve the connection strength. At the same time, both ends of the plastic part 12 in the second direction extend towards the bent portion. The first side of the plastic part 12 is also provided with connecting posts at both ends in the second direction that are adapted and positioned to the magnetic yoke 21.

[0069] In some embodiments, the diaphragm assembly 31 includes a diaphragm 311 and a vibrating plate 312. The outer periphery of the diaphragm 311 is fixed to the housing 10. The vibrating plate 312 is connected to the diaphragm 311. The vibrating plate 312 includes a main body 313 and support portions 314 disposed on both sides of the main body 313 in a second direction. The voice coil assembly 32 is connected to the main body 313. One end of the support portion 314 is connected to the main body 313, and the other end of the support portion 314 extends in a third direction. The support portion 314 is located outside the connecting portion 334, and the end of the support portion 314 away from the main body 313 is fixed to the elastic portion 332.

[0070] Specifically, the diaphragm 311 includes, from the inside out, a ring-shaped inner connecting portion 334, a folded ring portion, and an outer connecting portion 334 connected in sequence. The outer connecting portion 334 is connected to the second side of the housing 10, and the inner connecting portion 334 is connected to the diaphragm 312. The main body portion 313 of the diaphragm 312 is connected between the diaphragm 311 and the voice coil assembly 32. The support portion 314 of the diaphragm 312 is located outside the connecting portion 334, and the end of the support portion 314 away from the main body portion 313 is fixed to the elastic portion 332. In this way, the polarization of the vibration system 30 can be reduced by the centering support 33, thereby improving the operational stability of the vibration system 30.

[0071] In some embodiments, the housing 10 further includes two steel meshes 13 respectively disposed on both sides of the magnetic circuit system 20 in a second direction. The projection of the steel meshes 13 in the perpendicular third direction is U-shaped, and the cross-section of the steel meshes 13 along the third direction is L-shaped. The steel meshes 13 are connected between the metal parts 11 of the steel meshes 13, and along the first direction, both ends of the steel meshes 13 extend to the edge magnetic part 26. The steel meshes 13 are also provided with ventilation holes.

[0072] The second aspect of this utility model also provides an electronic device, including the sound-generating device 100 of any of the above-described embodiments. The structure of the sound-generating device 100 is as described in the above embodiments. Since the electronic device in this embodiment includes the electronic devices in all the above-described embodiments, it also has at least the beneficial effects of the above-described embodiments, which will not be described in detail here.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 therein. Such 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 this utility model.

Claims

1. A sound producing device, characterized by, include: case; A magnetic circuit system connected to the housing, the magnetic circuit system having a first magnetic gap and a second magnetic gap arranged side by side along a first direction; A vibration system includes a diaphragm assembly, a voice coil assembly, and a centering assembly. The diaphragm assembly is disposed on one side of the magnetic circuit system and its outer periphery is fixed to the housing. The voice coil assembly includes a first voice coil and a second voice coil arranged side by side. One end of the first voice coil is connected to the diaphragm assembly, and the other end of the first voice coil is correspondingly disposed to a first magnetic gap. One end of the second voice coil is connected to the diaphragm assembly, and the other end of the second voice coil is correspondingly disposed to a second magnetic gap. The centering assembly includes two centering supports respectively disposed on both sides of a second direction perpendicular to the first direction of the magnetic circuit system. The centering supports include an outer fixing portion. The system comprises an elastic portion and an inner fixing portion. The elastic portion is formed as a single elastic arm extending along the first direction to both ends of the magnetic circuit system. The outer fixing portion is disposed at both ends of the elastic portion along its length direction and is fixedly connected to the housing. The inner fixing portion includes a connecting portion extending along a third direction and a pad portion extending along a second direction. The third direction is perpendicular to the first direction and the second direction, respectively. Both ends of the connecting portion are connected to the elastic portion and the pad portion, respectively. The voice coil assembly is provided with a lead assembly. The pad portion is located on both sides of the voice coil assembly in the second direction. One side of the pad portion is electrically connected to the lead assembly, and the other side of the pad portion is connected to the diaphragm assembly.

2. The sound production device of claim 1, wherein, The magnetic circuit system includes a central magnetic part and a side magnetic part disposed on the outer periphery of the central magnetic part. The central magnetic part includes a first magnetic part, a second magnetic part and a third magnetic part arranged side by side along the first direction. The first magnetic part, the second magnetic part and the side magnetic part together define the first magnetic gap. The third magnetic part, the second magnetic part and the side magnetic part together define the second magnetic gap.

3. The sound production device of claim 2, wherein, The side magnetic portion consists of two side magnetic portions disposed on both sides of the central magnetic portion in the first direction. The side magnetic portion includes a first extension portion extending along the second direction and two second extension portions extending along the first direction. The two second extension portions are located at both ends of the length direction of the first extension portion. One end of the second extension portion is connected to the first extension portion, and the other end of the second extension portion extends along the first direction toward the side closer to the central magnetic portion.

4. The sound production device of claim 3, wherein, The first voice coil has a first connecting edge extending along the first direction, the length of the first connecting edge is L1, and the extension length of the second extension along the first direction is L2, 0.5≤L2 / L1<1; And / or, the connection between the first extension and the second extension is provided with an angled portion, and along the second direction, the angled portion extends obliquely toward the side closer to the central magnet, and the two ends of the elastic portion are respectively provided with an inclined portion consistent with the outline of the angled portion.

5. The sound production device of claim 2, wherein, The first magnetic part and the third magnetic part have the same outer contour. Along the second direction, the extension length of the second magnetic part is greater than the extension length of the first magnetic part and the third magnetic part.

6. The sound production device of claim 5, wherein, The lead wire assembly of the voice coil assembly is located on the side of the voice coil assembly near the second magnet and extends out along the second direction. The second magnet includes a body and end portions located at both ends of the body in the second direction. The width of the end portions is smaller than the width of the body, and the end portions define the lead wire exit space between the body and the voice coil assembly.

7. The sound production device of claim 2, wherein, The side magnet part includes a side magnet and a side magnetic guide plate disposed on the side of the side magnet facing the diaphragm assembly. The housing includes a ring-shaped metal part, and the metal part and the side magnetic guide plate are formed as an integral part.

8. The sound production device of claim 7, wherein, The housing also includes two plastic parts respectively located on both sides of the magnetic circuit system in the first direction, and the two plastic parts are integrally injection molded with the metal part.

9. The sound-generating device according to any one of claims 1-8, characterized in that, The diaphragm assembly includes a diaphragm and a diaphragm plate. The outer periphery of the diaphragm is fixed to the housing. The diaphragm plate is connected to the diaphragm. The diaphragm plate includes a main body and support legs located on both sides of the main body in the second direction. The voice coil assembly is connected to the main body. One end of the support leg is connected to the main body, and the other end of the support leg extends along the third direction. The support leg is located outside the connecting portion, and the end of the support leg away from the main body is fixed to the elastic portion.

10. An electronic device, comprising: Includes the sound-generating device according to any one of claims 1-9.

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