Sound production device and electronic device

Abstract

The utility model belongs to the electric -acoustic conversion technical field, and concretely relates to a sound production device and electronic equipment applying the sound production device, and the sound production device includes magnetic circuit system, casing, microphone unit and loudspeaker unit, wherein, magnetic circuit system forms first magnetic gap and second magnetic gap, the casing includes first frame body and second frame body, first frame body has magnetically conductive, the microphone unit includes first diaphragm and the first voice coil that is connected to first diaphragm, and the periphery of first diaphragm is connected to first frame body, and the first voice coil is inserted into first magnetic gap, the loudspeaker unit includes second diaphragm and the second voice coil that is connected to second diaphragm, and the periphery of second diaphragm is connected to second frame body, and the second voice coil is inserted into second magnetic gap. The above structure can improve the saturation magnetic flux density of first magnetically conductive plate, so that the B value of magnet assembly is fully utilized to avoid waste, thereby improving the performance of sound production 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 an electronic device using the sound-generating device. Background Technology

[0002] Currently, to ensure that electronic products (such as mobile phones) have good stereo sound when in speakerphone mode and good privacy protection when in earpiece call mode, a dual-phase driver is typically used in the audio system of electronic products. This allows two sound waves with the same phase to be superimposed and enhanced to improve the stereo effect in speakerphone mode. Alternatively, based on the acoustic dipole effect, two sound waves with opposite phases are emitted to cancel each other out and attenuate, thereby improving privacy protection in earpiece call mode.

[0003] However, in the above structure, in order to maximize the B (magnetic induction intensity) value, the volume of the magnet is often increased while the thickness of the magnetic plate is reduced. However, if the magnetic plate is too thin, it will cause magnetic saturation, which will prevent about 10% of the magnetic field lines from being gathered into the magnetic circuit. This will result in the inability to fully utilize the B value of the magnet and cause serious waste.

[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 using the sound-generating device, so as 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] A magnetic circuit system includes a magnet assembly, a first magnetic guide plate, and a second magnetic guide plate. The first and second magnetic guide plates are disposed on opposite sides of the magnet assembly. The magnet assembly includes an inner magnet, a middle magnet, and an outer magnet. The middle magnet surrounds the outer side of the inner magnet and is spaced apart from the inner magnet, forming a first magnetic gap. The outer magnet surrounds the outer side of the middle magnet and is spaced apart from the middle magnet, forming a second magnetic gap. The first magnetic guide plate includes a first inner magnetic guide plate and a first outer magnetic guide plate. The plate is connected to the internal magnet, and the first outer magnetic plate is connected to the middle magnet and the external magnet; the second magnetic plate includes a second inner magnetic plate and a second outer magnetic plate, the second inner magnetic plate is connected to the internal magnet and the middle magnet, and the second outer magnetic plate is connected to the external magnet; the first magnetic gap is located on the side of the second inner magnetic plate facing the first magnetic plate, and the second magnetic gap is located on the side of the first outer magnetic plate facing the second magnetic plate; wherein, the ratio of the thickness of the external magnet to the thickness of the first outer magnetic plate is ≥3.5;

[0008] The housing includes a first frame and a second frame. The first frame is disposed on the side of the first outer magnetic plate opposite to the second magnetic plate, and the second frame is disposed on the side of the outer magnet opposite to the first magnetic plate. The first frame is magnetically conductive, and the first frame and the second magnetic gap are at least partially opposite to each other.

[0009] The receiving unit includes a first diaphragm and a first voice coil connected to the first diaphragm. The outer periphery of the first diaphragm is connected to the first frame, and the first voice coil is inserted into the first magnetic gap.

[0010] The speaker unit includes a second diaphragm and a second voice coil connected to the second diaphragm. The outer periphery of the second diaphragm is connected to the second frame, and the second voice coil is inserted into the second magnetic gap.

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

[0012] In some specific embodiments of this utility model, the first frame is made of low-carbon steel.

[0013] In some specific embodiments of this utility model

[0014] The ratio of the thickness of the external magnet to the thickness of the first external magnetic plate is ≤5;

[0015] And / or, the first diaphragm includes a first folded ring and a first vibrating plate disposed in the central region of the first folded ring, the outer periphery of the first folded ring is connected to the first frame, and the deformed portion of the first folded ring is at least partially opposite to the second magnetic gap;

[0016] And / or, the central magnet is a ring magnet.

[0017] In some specific embodiments of this utility model, the central magnet and the external magnet are at the same height along the vibration direction of the first diaphragm, and the first outer magnetic plate is formed as a flat plate.

[0018] Alternatively, the external magnet protrudes from the central magnet on one side of the first magnetic guide plate, and the first external magnetic guide plate is bent and recessed towards the second magnetic guide plate at the position corresponding to the second magnetic gap to form a mounting bowl, and the first frame is connected to the mounting bowl.

[0019] In some specific embodiments of this utility model, the first frame is provided with a first connecting hole that connects the first magnetic gap with the external space of the sound-generating device; and / or, the second frame is provided with a second connecting hole that connects the second magnetic gap with the external space of the sound-generating device.

[0020] In some specific embodiments of this utility model, when the mounting bowl is formed on the first outer magnetic plate, the outer wall of the first frame and the inner wall of the mounting bowl form an external channel, and the first connecting hole communicates with the external space through the external channel.

[0021] In some specific embodiments of this utility model, there are multiple first connecting holes, which are evenly distributed along the circumference of the first frame; there are multiple second connecting holes, which are respectively located on the two opposite short axis sides of the second frame.

[0022] In some specific embodiments of this utility model, the first frame is provided with a plurality of positioning posts on the side facing the first magnetic plate, and the first outer magnetic plate is provided with a plurality of positioning holes, wherein the positioning posts are inserted into and adapted to the positioning holes.

[0023] In some specific embodiments of this utility model, the second frame and the second outer magnetic plate are integral injection molded structures.

[0024] A second aspect of this utility model also provides an electronic device, including any of the sound-generating devices described above.

[0025] This invention's sound-generating device possesses both speaker and receiver functions by incorporating a receiver unit and a speaker unit. Specifically, the receiver unit and speaker unit can emit two types of sound waves. When the two sound waves are in phase, they can be superimposed to enhance each other, thereby improving the stereo effect in external sound playback mode. That is, when the speaker unit is operating in external sound playback mode, the receiver unit can be controlled to emit sound waves of the same phase to assist in enhancing the sound output. When the two sound waves are in opposite phases, based on the principle of acoustic dipole effect, these two opposite-phase sound waves can cancel each other out, resulting in attenuation and thus improving privacy protection in handset call mode. Furthermore, since the receiver unit and speaker unit of this invention share a magnetic circuit system, compared to simply stacking the receiver module and speaker module back-to-back, this invention reduces the number of magnets required, simplifying the overall structure and reducing the overall thickness of the sound-generating device, thereby improving the ease of installation on electronic devices.

[0026] Meanwhile, since the first frame is mounted on the first magnetic plate and is magnetically conductive, and is at least partially opposite to the second magnetic gap in the axial direction of the magnet assembly, the first frame can increase the thickness of the first outer magnetic plate corresponding to the region of the second magnetic gap. This increases the saturation magnetic flux density of the first outer magnetic plate, improves the magnetizing effect, and allows more magnetic field lines to enter the magnetic circuit. This reduces the impact of reducing the thickness of the first outer magnetic plate and increasing the thickness of the external magnet on the saturation magnetic flux density of the first outer magnetic plate, allowing the increased B value in the magnet assembly to be fully utilized and avoided waste. Therefore, the performance of the sound-generating device can be further improved without changing the original structure. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a three-dimensional structural diagram of the sound-generating device in an embodiment of the present utility model;

[0029] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure;

[0030] Figure 3 for Figure 1 Exploded view of the structure.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100 - Sound-generating device;

[0033] 10-Magnetic circuit system, 11-First magnetic guide plate, 111-First inner magnetic guide plate, 112-First outer magnetic guide plate, 12-Second magnetic guide plate, 121-Second inner magnetic guide plate, 122-Second outer magnetic guide plate, 13-Magnetic assembly, 131-Inner magnet, 132-Middle magnet, 133-Outer magnet, 10a-First magnetic gap, 10b-Second magnetic gap;

[0034] 20 - Shell, 21 - First frame, 21a - First connecting hole, 22 - Second frame, 23 - Cover plate; 22a - Second connecting hole;

[0035] 30 - Receiver unit, 31 - First diaphragm, 311 - First surround, 312 - First diaphragm, 32 - First voice coil;

[0036] 40 - Speaker unit, 41 - Second diaphragm, 411 - Second surround, 412 - Second diaphragm, 42 - Second voice coil. 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] This utility model proposes a sound-generating device 100, which can be applied to electronic devices, specifically mobile phones or tablet computers, or other electronic devices capable of generating sound.

[0042] Please refer to the reference. Figures 1-3In one embodiment of the present invention, the sound-generating device 100 includes a magnetic circuit system 10, a housing 20, a receiving unit 30, and a speaker unit 40. The magnetic circuit system 10 includes a magnet assembly 13, a first magnetic guide plate 11, and a second magnetic guide plate 12. The first magnetic guide plate 11 and the second magnetic guide plate 12 are respectively disposed on opposite sides of the magnet assembly 13. The magnet assembly 13 includes an inner magnet 131, a middle magnet 132, and an outer magnet 133. The middle magnet 132 surrounds the outer side of the inner magnet 131 and is spaced apart from the inner magnet 131, forming a first magnetic field between them. A gap 10a is formed where an outer magnet 133 surrounds the outer side of a central magnet 132, spaced apart from the central magnet 132, forming a second magnetic gap 10b. A first magnetically conductive plate 11 includes a first inner magnetically conductive plate 111 and a first outer magnetically conductive plate 112. The first inner magnetically conductive plate 111 is connected to the inner magnet 131, and the first outer magnetically conductive plate 112 is connected to both the central magnet 132 and the outer magnet 133. A second magnetically conductive plate 12 includes a second inner magnetically conductive plate 121 and a second outer magnetically conductive plate 122. The second inner magnetically conductive plate 121 is connected to both the inner magnet 131 and the central magnet 132. The second outer magnetic plate 122 is connected to the outer magnet 133. The first magnetic gap 10a is located on the side of the second inner magnetic plate 121 facing the first magnetic plate 11, and the second magnetic gap 10b is located on the side of the first outer magnetic plate 112 facing the second magnetic plate 12. The ratio of the thickness of the outer magnet 133 to the thickness of the first outer magnetic plate 112 is ≥3.5. The housing 20 includes a first frame 21 and a second frame 22. The first frame 21 is located on the side of the first outer magnetic plate 112 facing away from the second magnetic plate 12, and the second frame 22 is located on the side of the outer magnet 133 facing away from the second magnetic plate 12. On one side of a magnetic plate 11, a first frame 21 is magnetically conductive, and the first frame 21 and the second magnetic gap 10b are at least partially opposite each other; the receiving unit 30 includes a first diaphragm 31 and a first voice coil 32 connected to the first diaphragm 31, the outer periphery of the first diaphragm 31 is connected to the first frame 21, and the first voice coil 32 is inserted into the first magnetic gap 10a; the speaker unit 40 includes a second diaphragm 41 and a second voice coil 42 connected to the second diaphragm 41, the outer periphery of the second diaphragm 41 is connected to the second frame 22, and the second voice coil 42 is inserted into the second magnetic gap 10b.

[0043] In this embodiment, the magnet assembly 13 in the magnetic circuit system 10 is used to form the first magnetic gap 10a and the second magnetic gap 10b. Specifically, the inner magnet 131 and the middle magnet 132 in the magnet assembly 13 can enclose and form the first magnetic gap 10a, while the outer magnet 133 and the middle magnet 132 can enclose and form the second magnetic gap 10b. At this time, the first magnetic gap 10a and the second magnetic gap 10b share the middle magnet 132, which helps to improve the degree of sharing of the magnetic circuit system 10 between the receiving unit 30 and the speaker unit 40, thereby greatly simplifying the structure. At the same time, the first magnetic gap 10a and the second magnetic gap 10b can also be said to be nested in the thickness direction of the magnetic circuit system 10, which can minimize the space occupied by the first magnetic gap 10a and the second magnetic gap 10b in the thickness direction of the magnetic circuit system 10 to the greatest extent, thereby greatly reducing the overall thickness of the sound-emitting device 100, so that it can be more conveniently installed in the limited installation space of the electronic device. The internal magnet 131 can be square, round, or racetrack-shaped, etc., to make its shape relatively regular and easy to process and shape. Of course, it can also be other shapes. That is to say, this application does not limit the specific shape of the internal magnet 131. Specifically, it can be adapted to the shape of the first voice coil 32 of the receiving unit 30 so as to better fit and accommodate the first voice coil 32.

[0044] The first magnetic plate 11 and the second magnetic plate 12 in the magnetic circuit system 10 can be used to clamp and fix the magnet assembly 13, so that the magnet assembly 13 can be easily assembled together. At the same time, the first magnetic plate 11 and the second magnetic plate 12 can also gather and guide more magnetic field lines to form a magnetic loop, thereby enhancing the magnetic performance and thus helping to improve the B value of the magnetic circuit system 10.

[0045] Specifically, the first magnetic plate 11 can be stacked on the surfaces of the inner magnet 131, the middle magnet 132, and the outer magnet 133 facing the receiving unit 30. Furthermore, the first magnetic plate 11 can be composed of two independent components: a first inner magnetic plate 111 and a first outer magnetic plate 112. The first inner magnetic plate 111 is stacked on the inner magnet 131, and the first outer magnetic plate 112 is arranged around the outer side of the first inner magnetic plate 111 and stacked on the middle magnet 132 and the outer magnet 133. The first voice coil 32 of the receiving unit 30 can pass through the gap between the first inner magnetic plate 111 and the first outer magnetic plate 112 and be inserted into the first magnetic gap 10a. This allows for a high degree of freedom in the manufacturing of the first inner magnetic plate 111 and the first outer magnetic plate 112. That is, the first inner magnetic plate 111 and the first outer magnetic plate 112 can be manufactured separately and independently, with adaptable choices in material selection and processing technology.

[0046] The second magnetic plate 12 can be stacked on the surfaces of the inner magnet 131, the middle magnet 132, and the outer magnet 133 facing the second sound-emitting unit. Furthermore, the second magnetic plate 12 can include a second inner magnetic plate 121 and a second outer magnetic plate 122. In this case, the second inner magnetic plate 121 is stacked on the inner magnet 131 and the middle magnet 132, while the second outer magnetic plate 122 is stacked on the outer magnet 133. The second voice coil 42 of the speaker unit 40 can pass through the gap between the second inner magnetic plate 121 and the second outer magnetic plate 122 and be inserted into the second magnetic gap 10b. Therefore, the second magnetic plate 12 can be composed of two independent components, the second inner magnetic plate 121 and the second outer magnetic plate 122, thus allowing for a high degree of freedom in the manufacturing process. That is, the second inner magnetic plate 121 and the second outer magnetic plate 122 can be manufactured separately and independently, and the material selection and processing technology can be adapted independently.

[0047] Meanwhile, by adjusting the thickness of the external magnet 133 and the thickness of the first external magnetic plate 112, and making their thickness ratio ≥3.5, the thickness of the external magnet 133 can be increased by reducing the thickness of the first external magnetic plate 112 without changing the overall thickness of the magnetic circuit system. This increases the volume of the external magnet 133 and the B value of the magnetic circuit system.

[0048] The first frame 21 and the second frame 22 are connected to the first magnetic plate 11 and the second magnetic plate 12 on opposite sides of the magnetic circuit system 10. This allows the receiving unit 30 and the speaker unit 40 to be connected to opposite sides of the magnetic circuit system 10 via the first frame 21 and the second frame 22, so that the first voice coil 32 of the receiving unit 30 and the second voice coil 42 of the speaker unit 40 are respectively inserted into the first magnetic gap 10a and the second magnetic gap 10b, and are respectively located in two fixed magnetic fields. After being energized, the first voice coil 32 of the receiving unit 30 and the second voice coil 42 of the speaker unit 40 are subjected to Ampere force in the fixed magnetic field at the first magnetic gap 10a and the fixed magnetic field at the second magnetic gap 10b, thereby driving the first diaphragm 31 and the second diaphragm 41 to vibrate along their axes to produce sound. In the speaker mode, sound is emitted by the vibration of the second diaphragm 41 of the speaker unit. In the handset mode, the receiver unit 30 and the speaker unit 40 work together. That is, the sound waves emitted by the vibration of the first diaphragm 31 of the receiver unit 30 and the sound waves emitted by the vibration of the second diaphragm 41 of the speaker unit 40 are out of phase. Based on the principle of acoustic dipole effect, the two sound waves with out of phase can cancel each other out and achieve attenuation, so as to protect privacy in the handset mode.

[0049] Along the axial direction of the magnet assembly, the first frame 21 and the second magnetic gap 10b are at least partially opposite each other. Since the first frame 21 is magnetically conductive and connected to the first outer magnetic plate, it increases the thickness of the first outer magnetic plate 112 corresponding to the region of the second magnetic gap 10b, thereby increasing the saturation magnetic flux density of the first outer magnetic plate 112, improving the magnetic focusing effect, and allowing more magnetic field lines to enter the magnetic circuit. This reduces the impact of the aforementioned reduction in the thickness of the first outer magnetic plate 112 and the increase in the thickness of the external magnet 133 on the saturation magnetic flux density of the first outer magnetic plate 112. It allows the increased B value in the magnet assembly 13 to be fully utilized and avoids waste, thus further improving the performance of the sound-generating device 100 without changing the original structure.

[0050] The sound-generating device 100 of this embodiment of the invention has both sound-speaking and sound-receiving functions by providing a receiving unit 30 and a speaker unit 40. Specifically, the receiving unit 30 and the speaker unit 40 can emit two types of sound waves. When the two sound waves are in phase, they can be superimposed to enhance each other, thereby improving the stereo effect in the external sound playback mode. That is, when the speaker unit 40 is operating in the external sound playback mode, the receiving unit 30 can be controlled to emit sound waves of the same phase to assist in enhancing the sound generation effect. When the two sound waves are in opposite phases, based on the principle of acoustic dipole effect, the two sound waves with opposite phases can cancel each other out to attenuate each other, thereby improving the privacy protection effect in the handset call mode. Furthermore, since the receiving unit 30 and the speaker unit 40 of the sound-generating device 100 in this utility model share a magnetic circuit system 10, compared with simply stacking the receiver module and speaker module back to back, the sound-generating device 100 in this utility model can reduce the number of magnet systems, thereby simplifying the overall structure of the sound-generating device 100 and reducing its overall thickness, so as to improve the convenience of subsequent installation of the sound-generating device 100 on electronic devices.

[0051] Meanwhile, since the first frame 21 is mounted on the first magnetic plate 11 and has magnetic conductivity, and is at least partially opposite to the second magnetic gap 10b in the axial direction of the magnet assembly, the first frame 21 can increase the thickness of the first outer magnetic plate 112 corresponding to the region of the second magnetic gap 10b, maximizing the magnetic focusing effect of the first outer magnetic plate 112 and allowing more magnetic field lines to enter the magnetic circuit. This reduces the impact of the aforementioned reduction in the thickness of the first outer magnetic plate 112 and the increase in the thickness of the external magnet 133 on the saturation magnetic flux density of the first outer magnetic plate 112, allowing the increased B value in the magnet assembly 13 to be fully utilized and avoided waste, thereby further improving the performance of the sound-generating device 100 without changing the original structure.

[0052] In some embodiments, the first frame 21 is made of low-carbon steel.

[0053] Low-carbon steel has the advantages of low cost, easy processing and high saturation magnetic flux density. The first frame 21 made of low-carbon steel, such as cold-rolled low-carbon steel, is not only easy to process but also has good magnetic conductivity, which can better match the first magnetic plate 11 to improve the magnetic concentration effect.

[0054] In some embodiments, the magnet assembly 13 includes an inner magnet 131, a middle magnet 132, and an outer magnet 133. The middle magnet 132 is a closed annular structure, and it surrounds the outer side of the inner magnet 131, forming a first magnetic gap 10a with the inner magnet 131 spaced apart. The outer magnet 133 surrounds the outer side of the middle magnet 132, forming a second magnetic gap 10b with the middle magnet 132 spaced apart. The first magnetic plate 11 includes a first inner magnetic plate 111 and a first outer magnetic plate 112 surrounding the first inner magnetic plate 111. The gap between the first inner magnetic plate 111 and the first outer magnetic plate 112 corresponds to the first magnetic gap 10a. The second magnetic plate 12 includes a second inner magnetic plate 121 and a second outer magnetic plate 122 surrounding the second inner magnetic plate 121. The gap between the second inner magnetic plate 121 and the second outer magnetic plate 122 corresponds to the second magnetic gap 10b.

[0055] In some embodiments, the ratio of the thickness of the external magnet 133 to the thickness of the first external magnetic plate 112 is ≤5. If the ratio is greater than 5, to ensure the magnetic focusing effect of the first frame 21, the dimension of the first frame 21 perpendicular to the vibration direction needs to be increased. However, this adjustment will affect the dimension of the first diaphragm 31, thereby reducing the sound production performance of the sound-generating device. Therefore, when the ratio of the thickness of the external magnet 133 to the thickness of the first external magnetic plate 112 is less than or equal to 5, the magnetic focusing effect of the first frame 21 can be ensured while maintaining the dimension of the first diaphragm 31, thus ensuring the sound production performance of the sound-generating device.

[0056] In some embodiments, the first diaphragm includes a first folded ring 311 and a first vibrating plate 312 disposed in the central region of the first folded ring 311. The outer periphery of the first folded ring 311 is connected to the first frame 21, and the deformable portion of the first folded ring 311 is at least partially opposite to the second magnetic gap 10b. In some embodiments, to improve the connection strength between the first folded ring 311 and the first frame 21, an annular cover plate 23 is also provided on the side of the first folded ring 311 facing away from the first frame 21. Along the axial direction of the magnetic circuit system 10, the deformable portion of the first folded ring 311 is at least partially opposite to the second magnetic gap 10b.

[0057] Similarly, the second diaphragm 41 includes a second folded ring 411 and a second vibrating plate 412 connected to the center of the second folded ring 411. The second folded ring 411 is annular and its outer periphery is connected to the second frame 22.

[0058] In some embodiments, the central magnet 132 is a ring magnet. The central magnet 132 can be a closed ring structure to directly isolate and block the first magnetic gap 10a and the second magnetic gap 10b. Moreover, since the central magnet 132 is a single integral component, it can be easily installed in one go, thus improving the convenience of installation.

[0059] Of course, this application is not limited to this. In other embodiments, the central magnet 132 can also be a structure of multiple spaced magnetic strips. In this case, a filler is provided between two adjacent magnetic strips to form a closed annular structure, ensuring that the first magnetic gap 10a and the second magnetic gap 10b can be isolated from each other. Since the external magnet 133 does not need to isolate the first magnetic gap 10a and the second magnetic gap 10b, the external magnet 133 can be a closed annular structure, or it can be a structure of multiple spaced magnetic strips.

[0060] In this invention, the sound-generating device 100 shares a magnetic circuit system 10 with the receiving unit 30 and the speaker unit 40, which are positioned on opposite sides of the magnetic circuit system 10. The first diaphragm 31 of the receiving unit 30 can be enclosed with the magnetic circuit system 10 to form a first rear cavity, and the second diaphragm 41 of the speaker unit 40 can be enclosed with the magnetic circuit system 10 to form a second rear cavity isolated from the first rear cavity. Since the central magnet 132 is a ring magnet, the first rear cavity of the receiving unit 30 and the second rear cavity of the speaker unit 40 are isolated, allowing the first diaphragm of the receiving unit 30 and the second diaphragm of the speaker unit 40 to vibrate only within the first and second rear cavities respectively, thus preventing mutual interference. This ensures that both the receiving unit 30 and the speaker unit 40 can operate normally and stably, avoiding the possibility of increased nonlinear distortion and abnormal vibration noise caused by affecting their respective vibration states, thereby improving the sound output of the electronic device. In summary, the sound-generating device 100 of this utility model achieves good external playback effect when the electronic device is in speaker playback mode and good privacy protection effect when it is in earpiece call mode. It simplifies the structure of the sound-generating device 100 and improves its ease of installation in electronic devices, while also ensuring the sound-generating effect of the electronic device.

[0061] In some embodiments, the central magnet 132 and the outer magnet 133 are at the same height along the vibration direction of the first diaphragm 31, and the first outer magnetic plate 112 is formed as a flat plate. This reduces the processing difficulty of the first outer magnetic plate 112, improves the processing efficiency of the first outer magnetic plate 112, and thus improves the processing efficiency of the sound generating device 100.

[0062] In some embodiments, the outer magnet 133 protrudes from the middle magnet 132 on one side facing the first magnetic plate 11, and the center of the first outer magnetic plate 112 is bent and recessed towards the second magnetic plate 12 at the position corresponding to the second magnetic gap 10b to form a mounting bowl, and the first frame 21 is connected to the mounting bowl.

[0063] Specifically, since the height of the outer magnet 133 along the vibration direction is greater than that of the central magnet 132, the outer magnet 133 has a larger volume, which further increases the B value. Correspondingly, by bending and recessing the center of the first outer magnetic plate 112 towards the second magnetic plate 12 to form a mounting bowl, and connecting the first frame 21 inside the mounting bowl, the overall height of the sound-generating device 100 can be maintained without increasing the overall height. At the same time, since the first frame 21 is magnetically conductive, the saturation magnetic flux density at the bending position of the first outer magnetic plate 112 can be increased, thereby improving the magnetic focusing effect and avoiding the impact of the bending process on the saturation magnetic flux density at the first outer magnetic plate 112.

[0064] In some embodiments, the first frame 21 is provided with a first communication hole 21a that connects the first magnetic gap 10a with the external space of the sound-generating device 100.

[0065] Specifically, the first diaphragm 31 and the magnetic circuit system 10 enclose one side of the first magnetic gap 10a to form the first rear cavity. The first connecting hole 21a connects the first magnetic gap 10a and the external space, that is, connects the first rear cavity and the external space. This can help to further improve the smoothness of airflow between the first rear cavity and the external space, so as to effectively expand the first rear cavity by utilizing the external space.

[0066] In some embodiments, the second frame 22 is provided with a second communication hole 22a that connects the second magnetic gap 10b with the external space of the sound-generating device 100.

[0067] Specifically, the second diaphragm 41 and the magnetic circuit system 10 enclose each other on one side of the second magnetic gap 10b to form a second rear cavity. The second connecting hole 22a connects the second magnetic gap 10b and the external space, that is, connects the second rear cavity and the external space. This can help to further improve the smoothness of airflow between the second rear cavity and the external space, so as to effectively expand the second rear cavity by utilizing the external space.

[0068] In some embodiments, when a mounting bowl is formed on the first outer magnetic plate 112, the outer wall of the first frame 21 and the inner wall of the mounting bowl form an external channel, and the first connecting hole 21a communicates with the external space through the external channel. This makes the first connecting hole 21a on the first frame 21 a laterally connected structure, enabling rapid communication with the external space of the sound-generating device 100 through the external channel. Furthermore, when the sound-generating device 100 is installed inside the housing of an electronic device, even if the inner wall of the housing abuts against the end of the first frame 21 away from the speaker unit 40, the first connecting hole 21a, being laterally connected to the external channel, is unlikely to be blocked by the inner wall of the housing or other components, thus facilitating communication between the first rear cavity of the sound-generating device 100 and the mounting cavity of the electronic device housing.

[0069] Of course, it should be noted that this application is not limited to this. It is also possible to connect the first rear cavity and the external space of the sound-emitting device 100 by passing a connecting pipe through the first frame 21.

[0070] In some embodiments, there are multiple first connecting holes 21a, which are evenly distributed along the circumference of the first frame 21; there are multiple second connecting holes 22a, which are evenly distributed along the circumference of the second frame 22.

[0071] There are multiple first connecting holes 21a and second connecting holes 22a, which are evenly distributed along the circumference of the first frame 21 and the second frame 22, respectively, on their sides.

[0072] The first connecting hole 21a can be a complete hole or a half hole. When it is a half hole, it is located on the side of the first frame 21 facing the first outer magnetic plate 112, and when the first frame 21 and the first outer magnetic plate 112 are assembled, it surrounds the first outer magnetic plate 112 to form a complete hole.

[0073] In some embodiments, the first frame 21 has a plurality of positioning posts on the side facing the first magnetic plate 11, and the first outer magnetic plate 112 has a plurality of positioning holes, with the positioning posts and positioning holes being plugged into each other.

[0074] Specifically, the first frame 21 is provided with four positioning posts, which are located at both ends of the two long shafts of the first frame 21. The positions of the positioning holes correspond to the positioning posts. Thus, when the first frame 21 is assembled with the first outer magnetic plate 112, the positioning posts are inserted into the positioning holes to achieve precise positioning of the first frame 21 and the first outer magnetic plate 112.

[0075] In some embodiments, the second frame 22 and the second outer magnetic plate 122 are integrally injection molded structures. This can improve the connection strength between the second frame 22 and the second outer magnetic plate 122, and also improve their connection strength.

[0076] In some embodiments, the speaker unit 40 further includes multiple centering supports, each comprising an outer connecting portion, an inner connecting portion, and a cantilever portion connecting the outer connecting portion and the inner connecting portion. The multiple centering supports are arranged circumferentially along the second voice coil 42 and are connected to the side of the second frame 22 facing the first magnetic plate 11 via the outer connecting portion, and to the end of the second voice coil 42 opposite to the second diaphragm 41 via the inner connecting portion. The centering supports are used to reduce the polarization of the second voice coil 42.

[0077] The second aspect of this utility model also provides an electronic device, including a sound-generating device 100 as described above. The structure of the sound-generating device 100 is as described in the above embodiments. Since the electronic device in this embodiment includes the sound-generating device 100 in all the above embodiments, it also has at least the beneficial effects of the sound-generating device 100 described above, which will not be described in detail here.

[0078] 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-generating device, characterized in that, include: A magnetic circuit system includes a magnet assembly, a first magnetic guide plate, and a second magnetic guide plate. The first and second magnetic guide plates are disposed on opposite sides of the magnet assembly. The magnet assembly includes an inner magnet, a middle magnet, and an outer magnet. The middle magnet surrounds the outer side of the inner magnet and is spaced apart from the inner magnet, forming a first magnetic gap. The outer magnet surrounds the outer side of the middle magnet and is spaced apart from the middle magnet, forming a second magnetic gap. The first magnetic guide plate includes a first inner magnetic guide plate and a first outer magnetic guide plate. The first inner magnetic guide plate... The first outer magnetic plate is connected to the inner magnet, and the second magnetic plate is connected to the middle magnet and the outer magnet. The second magnetic plate includes a second inner magnetic plate and a second outer magnetic plate. The second inner magnetic plate is connected to the inner magnet and the middle magnet, and the second outer magnetic plate is connected to the outer magnet. The first magnetic gap is located on the side of the second inner magnetic plate facing the first magnetic plate, and the second magnetic gap is located on the side of the first outer magnetic plate facing the second magnetic plate. The ratio of the thickness of the outer magnet to the thickness of the first outer magnetic plate is ≥3.

5. The housing includes a first frame and a second frame. The first frame is disposed on the side of the first outer magnetic plate opposite to the second magnetic plate, and the second frame is disposed on the side of the outer magnet opposite to the first magnetic plate. The first frame is magnetically conductive, and the first frame and the second magnetic gap are at least partially opposite to each other. The receiving unit includes a first diaphragm and a first voice coil connected to the first diaphragm. The outer periphery of the first diaphragm is connected to the first frame, and the first voice coil is inserted into the first magnetic gap. The speaker unit includes a second diaphragm and a second voice coil connected to the second diaphragm. The outer periphery of the second diaphragm is connected to the second frame, and the second voice coil is inserted into the second magnetic gap.

2. The sound-generating device according to claim 1, characterized in that, The first frame is made of low-carbon steel.

3. The sound-generating device according to claim 1, characterized in that, The ratio of the thickness of the external magnet to the thickness of the first external magnetic plate is ≤5; And / or, the first diaphragm includes a first folded ring and a first vibrating plate disposed in the central region of the first folded ring, the outer periphery of the first folded ring is connected to the first frame, and the deformed portion of the first folded ring is at least partially opposite to the second magnetic gap; And / or, the central magnet is a ring magnet.

4. The sound-generating device according to claim 1, characterized in that, The central magnet and the external magnet are at the same height along the vibration direction of the first diaphragm, and the first outer magnetic plate is formed as a flat plate. Alternatively, the external magnet protrudes from the central magnet on one side of the first magnetic guide plate, and the first external magnetic guide plate is bent and recessed towards the second magnetic guide plate at the position corresponding to the second magnetic gap to form a mounting bowl, and the first frame is connected to the mounting bowl.

5. The sound-generating device according to claim 4, characterized in that, The first frame is provided with a first connecting hole that connects the first magnetic gap to the external space of the sound-generating device; and / or, the second frame is provided with a second connecting hole that connects the second magnetic gap to the external space of the sound-generating device.

6. The sound-generating device according to claim 5, characterized in that, When the mounting bowl is formed on the first outer magnetic plate, the outer wall of the first frame and the inner wall of the mounting bowl form an external channel, and the first connecting hole communicates with the external space through the external channel.

7. The sound-generating device according to claim 5, characterized in that, There are multiple first connecting holes, which are evenly distributed along the circumference of the first frame; there are multiple second connecting holes, which are evenly distributed along the circumference of the second frame.

8. The sound-generating device according to claim 1, characterized in that, The first frame has multiple positioning posts on the side facing the first magnetic plate, and the first outer magnetic plate has multiple positioning holes. The positioning posts are inserted into and adapted to the positioning holes.

9. The sound-generating device according to claim 1, characterized in that, The second frame and the second outer magnetic plate are an integral injection-molded structure.

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

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