Vibration sound production device and electronic device

Abstract

This invention relates to the field of vibration-generated sound technology, specifically to vibration-generated sound devices and electronic equipment, including a frame, a magnetic drive assembly, a voice coil assembly, a spider, a diaphragm, and a heat dissipation assembly. The magnetic drive assembly is connected to the frame, and the voice coil assembly is vibratoryly suspended in the magnetic gap of the magnetic drive assembly. The spider is connected between the frame and the voice coil assembly, and the diaphragm is connected to the voice coil assembly. An air inlet is provided at the bottom of the magnetic drive assembly, connecting the outside of the device to its interior. This invention, by creating an air inlet at the bottom of the magnetic drive assembly and an exhaust vent below the spider on the side wall of the frame, and utilizing the deformation of the spider as it vibrates with the voice coil to drive the flow of gas inside the device, forms an active heat dissipation circulation path: air enters from the bottom, flows across the voice coil surface, and exits from the side wall. By using the vibrational energy of the spider itself as the driving force, the heat dissipation efficiency is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of vibration sound generation technology, and in particular to vibration sound generation devices and electronic devices. Background Technology

[0002] Vibration-generating devices are the core components in electronic devices that achieve electroacoustic conversion. Traditional vibration-generating devices typically include a frame, a magnetic circuit system, a voice coil, a spider, and a diaphragm. The voice coil is vibratingly suspended in the magnetic gap of the magnetic circuit system. When an audio current passes through the voice coil, the voice coil drives the diaphragm to vibrate and produce sound under the action of the magnetic field force.

[0003] However, during operation, over 95% of the electrical energy input to the voice coil of a vibrating sound-generating device is converted into heat, causing a rapid increase in voice coil temperature. This increased temperature leads to increased resistivity, resulting in increased impedance, decreased driving force, and a power compression effect. In severe cases, it can even cause deformation of the voice coil frame and burnout of the insulation layer, seriously affecting the reliability and lifespan of the vibrating sound-generating device.

[0004] To address the heat dissipation problem of voice coils, some solutions exist in existing technologies, such as creating an axial through-hole at the center of the T-iron in the magnetic circuit system to passively dissipate heat using the airflow generated by diaphragm vibration. However, this passive heat dissipation method has a single airflow path, limited heat dissipation efficiency, and the airflow is mainly concentrated in the central through-hole area, with minimal effect on heat dissipation of the outer surface of the voice coil—the main heat-generating area. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a vibration-generating sound device and an electronic device, specifically as follows: On one hand, the present invention provides a vibration sound-generating device, including a frame, a magnetic drive assembly, a voice coil assembly, a spider, a diaphragm, and a heat dissipation assembly. The magnetic drive assembly is connected to the frame, the voice coil assembly is vibratingly suspended in the magnetic gap of the magnetic drive assembly, the spider is connected between the frame and the voice coil assembly, the diaphragm is connected to the voice coil assembly, and an air inlet is provided at the bottom of the magnetic drive assembly, the air inlet communicating between the outside of the device and the inside of the device. The side wall of the basin frame is provided with an exhaust hole, which is located axially below the elastic wave. When the spider vibrates with the voice coil assembly, it drives the gas flow inside the device, so that external air is drawn into the device from the air inlet, flows over the surface of the voice coil assembly, and is discharged from the air outlet.

[0006] As a further technical solution of the present invention, the air inlet is provided in multiple portions and is evenly distributed circumferentially at the bottom of the magnetic drive assembly.

[0007] As a further technical solution of the present invention, the exhaust holes are provided in multiple ways and are evenly distributed along the circumference of the side wall of the basin frame.

[0008] As a further technical solution of the present invention, the magnetic drive assembly includes an annular permanent magnet and a magnetically conductive yoke. The magnetically conductive yoke includes a central magnetically conductive column, a magnetically conductive outer cylinder, and a magnetically conductive base plate. The central magnetically conductive column is disposed on a central axis, and the annular permanent magnet is sleeved on the outer periphery of the central magnetically conductive column. A magnetic gap is formed between the inner wall of the annular permanent magnet and the outer wall of the central magnetically conductive column. The magnetically conductive outer cylinder is sleeved on the outer periphery of the annular permanent magnet, and the magnetically conductive base plate connects the bottom end of the central magnetically conductive column and the bottom end of the magnetically conductive outer cylinder. The air inlet is opened on the magnetically conductive base plate.

[0009] As a further technical solution of the present invention, it also includes a bellows disposed in an annular cavity between the lower part of the spider and the magnetic drive assembly. The bellows has a flared end facing the center of the voice coil assembly and a constricted end facing the exhaust hole. The flared end communicates with the annular space above the magnetic gap, and the constricted end communicates with the exhaust hole. The top of the flared end is connected to the inner surface of the spider, and the bottom of the flared end is connected to the upper surface of the annular permanent magnet. The bellows has folds along the axial direction.

[0010] As a further technical solution of the present invention, the bellows are provided in multiple groups, evenly distributed along the circumference, and the flared ends of all the bellows are connected to each other to form a ring structure surrounding the voice coil assembly.

[0011] As a further technical solution of the present invention, the voice coil assembly includes a voice coil skeleton and a voice coil winding; the axial length of the voice coil skeleton is greater than the axial depth of the magnetic gap, its upper end extends above the magnetic gap to connect the spider and the diaphragm, and its lower end extends below the magnetic gap near the air inlet.

[0012] On the other hand, the present invention also provides an electronic device, including a device housing and a vibration sound-generating device as described in any of the above claims; the vibration sound-generating device is installed inside the device housing, and the device housing has a device air inlet communicating with the air inlet hole and a device air outlet communicating with the air outlet hole.

[0013] The beneficial effects of this invention are as follows: This invention creates an active heat dissipation circulation path by opening an air inlet at the bottom of the magnetic drive assembly and an exhaust vent located below the spider on the side wall of the frame. It utilizes the deformation of the spider as it vibrates with the voice coil to drive the internal gas flow, forming an active heat dissipation circulation path from bottom intake, through the voice coil surface, and out through the side wall. Compared to the passive heat dissipation methods in the prior art, this invention uses the vibration energy of the spider itself as the driving force, requiring no additional power source, resulting in a compact structure and significantly improved heat dissipation efficiency. Furthermore, by placing the air inlet at the bottom of the magnetic drive assembly and the exhaust vent below the spider on the side wall of the frame, the airflow path completely covers the main heat-generating area of ​​the voice coil, avoiding the problem in the prior art where airflow concentrates in the central through-hole, resulting in insufficient heat dissipation on the outer surface of the voice coil.

[0014] By installing a bellows in the annular cavity between the spider and the magnetic drive assembly, the bellows has a flared end facing the voice coil assembly and a constricted end facing the exhaust port, and has pleats along the axial direction. When the spider vibrates with the voice coil, it drives the bellows to extend and retract. When the spider moves upward, the bellows stretches and the pleats open, the internal volume of the bellows expands and generates negative pressure, which draws hot air from the surface of the voice coil into the bellows through the flared end. When the spider moves downward, the bellows compresses and the pleats close, the internal volume of the bellows shrinks and generates high pressure, which discharges the drawn-in hot air from the exhaust port through the constricted end. The bellows converts the vibration energy of the spider into the power to pump airflow, which greatly enhances the driving capability of the cooling airflow.

[0015] The bellows' axially arranged pleated structure allows it to expand during stretching, providing additional volume increase, and close during compression, providing additional volume decrease. The volume change of the bellows is greater than that caused by the linear displacement of the spider alone, producing a "pumping amplification" effect. This results in a larger pumping volume for the same spider amplitude, further improving heat dissipation efficiency. At the same time, the flared end of the bellows faces the center of the voice coil assembly and directly faces the heat source, ensuring that the air heated on the voice coil surface is preferentially drawn in. The constricted end faces the exhaust port, and the converging flow channel accelerates the airflow during exhaust, creating a "jet" effect for more thorough exhaust and preventing hot air from lingering inside the device.

[0016] Multiple bellows are evenly distributed circumferentially, and the flared ends of all bellows intersect to form a ring structure surrounding the voice coil assembly. Each bellows independently corresponds to a segment of the arc length of the voice coil assembly, forming a 360° uniformly covered arrayed pumping network. The ring structure formed by the intersecting flared ends divides the lower working chamber circumferentially into multiple independent pumping units, eliminating airflow dead zones, ensuring uniform heat dissipation in all parts of the voice coil assembly, and effectively avoiding voice coil deformation and failure caused by localized overheating. Attached Figure Description

[0017] Figure 1 A schematic diagram of the vibration sound-generating device of the present invention is shown; Figure 2A schematic diagram of the magnetic drive assembly of the present invention is shown; Figure 3 A schematic diagram of the magnetically conductive yoke of the present invention is shown; Figure 4 A schematic diagram of the voice coil assembly of the present invention is shown; Figure 5 A schematic diagram of the heat dissipation component of the present invention is shown; Figure 6 A schematic diagram showing the circumferential distribution of the heat dissipation components of the present invention is provided. Figure 7 A schematic diagram of the air box in the heat dissipation assembly of the present invention is shown.

[0018] 10. Basket; 20. Magnetic drive assembly; 21. Ring permanent magnet; 22. Magnetic yoke; 221. Central magnetic column; 222. Magnetic outer cylinder; 223. Magnetic base plate; 23. Magnetic gap; 30. Voice coil assembly; 31. Voice coil frame; 32. Voice coil winding; 40. Spider; 50. Diaphragm; 60. Heat dissipation assembly; 61. Air inlet; 62. Air outlet; 63. Bellows; 631. Flared end; 632. Narrowed end; 633. Pleats. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Example 1

[0020] Figure 1 A schematic diagram of the vibration sound-generating device of the present invention is shown. The vibration sound-generating device includes a frame 10, a magnetic drive assembly 20, a voice coil assembly 30, a spider 40, a diaphragm 50, and a heat dissipation assembly 60. The frame 10 is the supporting skeleton of the entire sound-generating device and has a conical structure that is larger at the top and smaller at the bottom. The magnetic drive assembly 20 is connected to the bottom of the inner cavity of the frame 10. The voice coil assembly 30 is vibratingly suspended in the magnetic gap 23 of the magnetic drive assembly 20. The spider 40 is connected between the frame 10 and the voice coil assembly 30. The diaphragm 50 is connected between the top of the voice coil assembly 30 and the upper edge of the frame 10. The heat dissipation assembly 60 is integrated on the magnetic drive assembly 20 and the frame 10 and works in conjunction with the spider 40.

[0021] During operation, an external audio current is input to the voice coil assembly 30. The voice coil assembly 30 is subjected to an axial Lorentz force within the constant magnetic field generated by the magnetic drive assembly 20, driving it to reciprocate axially. The vibration of the voice coil assembly 30 is synchronously transmitted to the diaphragm 50 and the spider 40, which are fixedly connected to it. The diaphragm 50 pushes air to generate sound waves, achieving electroacoustic conversion. The spider 40 deforms as the voice coil assembly 30 vibrates, providing radial positioning and axial elastic restoring force to ensure stable axial movement of the voice coil assembly 30 within the magnetic gap 23 without lateral swaying. Furthermore, as a driving element for the heat dissipation assembly 60, it transfers vibrational energy to the heat dissipation assembly 60, driving the airflow circulation. The heat dissipation assembly 60 utilizes the pumping effect generated by the vibration of the spider 40 to draw external cold air into the device, which then flows over the surface of the voice coil assembly 30, carrying away heat. The heated air is then expelled from the device, forming an active heat dissipation cycle.

[0022] Figure 2 A schematic diagram of the magnetic drive assembly 20 of the present invention is shown. The magnetic drive assembly 20 includes an annular permanent magnet 21, a magnetically conductive yoke 22, and a magnetic gap 23 formed between the annular permanent magnet 21 and the magnetically conductive yoke 22. The annular permanent magnet 21 is made of neodymium iron boron and is radially magnetized. Its inner surface is an N pole and its outer surface is an S pole. It is the core element for generating a magnetic field. The magnetically conductive yoke 22 is made of low carbon steel and is mainly used to conduct magnetic fields. It cooperates with the annular permanent magnet 21 to form a closed magnetic circuit.

[0023] Figure 3 A schematic diagram of the magnetic yoke 22 of the present invention is shown. The magnetic yoke 22 is integrally formed and includes a central magnetic column 221, a magnetic outer cylinder 222, and a magnetic base plate 223. The central magnetic column 221 is a solid cylinder, vertically arranged on the central axis of the sound-generating device. An annular permanent magnet 21 is sleeved on the outer periphery of the central magnetic column 221, and a magnetic gap 23 is formed between the inner wall of the annular permanent magnet 21 and the outer wall of the central magnetic column 221. The magnetic outer cylinder 222 is cylindrical and is sleeved on the outer periphery of the annular permanent magnet 21, closely fitting the outer surface of the annular permanent magnet 21. The bottom of the magnetic outer cylinder 222 is connected to the outer edge of the magnetic base plate 223. The magnetic base plate 223 is disc-shaped, with its center connected to the bottom end of the central magnetic column 221 and its outer edge connected to the bottom end of the magnetic outer cylinder 222.

[0024] The closed magnetic circuit path is as follows: central magnetic guide post 221 → magnetic gap 23 → annular permanent magnet 21 → magnetic outer cylinder 222 → magnetic base plate 223 → central magnetic guide post 221, forming a complete closed magnetic circuit. During operation, the magnetic lines of force generated by the annular permanent magnet 21 originate from its inner surface N pole, travel radially outward through the magnetic gap 23, enter the central magnetic guide post 221 of the magnetic yoke 22, and then are axially conducted along the central magnetic guide post 221 to the magnetic base plate 223. From there, they are radially conducted to the magnetic outer cylinder 222, axially upward along the outer cylinder 222, and finally return to the outer surface S pole of the annular permanent magnet 21, forming a complete closed magnetic circuit.

[0025] Figure 4 A schematic diagram of the voice coil assembly 30 of the present invention is shown. The voice coil assembly 30 includes a voice coil skeleton 31 and a voice coil winding 32. The voice coil skeleton 31 is a thin-walled cylinder, fitted around the outer periphery of the central magnetic post 221. A radial gap is left between the inner wall of the voice coil skeleton 31 and the outer wall of the central magnetic post 221, and a radial gap is also left between the outer wall of the voice coil skeleton 31 and the inner wall of the magnetic outer cylinder 222. The lower half of the voice coil skeleton 31 is suspended in the magnetic gap 23. The voice coil winding 32 is wound with enameled copper wire. The outer peripheral surface of the voice coil skeleton 31 is formed and located in the axial region corresponding to the magnetic gap 23. When the audio current passes through the voice coil winding 32, the voice coil assembly 30 vibrates axially under the action of the magnetic field force. Furthermore, the axial length of the voice coil skeleton 31 is greater than the axial depth of the magnetic gap 23. The upper end of the voice coil skeleton 31 extends upward above the magnetic gap 23 to connect the spider 40 and the diaphragm 50. The lower end of the voice coil skeleton 31 extends downward below the magnetic gap 23, close to the upper surface of the magnetic base plate 223.

[0026] During operation, the design of the voice coil skeleton 31 having an axial length greater than the depth of the magnetic gap 23 has three functions: First, the upper end extends beyond the magnetic gap 23, providing sufficient connection area for the inner ring of the spider 40 and the center of the diaphragm 50, ensuring the reliability of vibration transmission; Second, the lower end extends below the magnetic gap 23 and close to the upper surface of the magnetic base plate 223, allowing the bottom of the voice coil skeleton 31 to be fully exposed to the cold airflow entering from the air inlet 61, enhancing the heat dissipation effect; Third, the extended voice coil skeleton 31 provides axial space for connection or close proximity to the bellows 63 of the heat dissipation assembly 60, allowing the flared end 631 of the bellows 63 to be close to the outer surface of the voice coil skeleton 31, directly drawing in hot air from near the heat source.

[0027] The spider 40 is an annular elastic sheet with multiple concentric corrugations, located in the upper middle part of the voice coil assembly 30 and above the annular permanent magnet 21. Its inner ring is fixedly sleeved on the outer wall of the upper end of the voice coil frame 31 and vibrates synchronously with the voice coil assembly 30. Its outer ring is fixedly bonded to the inner wall of the frame 10, dividing the internal space of the device into the upper diaphragm cavity and the lower working cavity, while providing radial positioning and axial elastic restoring force for the voice coil assembly 30.

[0028] During operation, the spider 40 undergoes axial stretching and compression deformation in response to the vibration of the voice coil assembly 30. Furthermore, the spider 40 divides the internal space of the device into two independent chambers: the upper diaphragm chamber communicates with the diaphragm 50 and is used for sound radiation; the lower working chamber houses the magnetic drive assembly 20 and the heat dissipation assembly 60, and is used for heat dissipation airflow circulation. The sealing and separating function of the spider 40 ensures that the heat dissipation airflow can only circulate within the lower working chamber and will not leak into the diaphragm chamber, affecting acoustic performance; simultaneously, the vibration of the spider 40 directly drives the expansion and contraction deformation of the bellows 63, which is the power source for the heat pump's suction.

[0029] The diaphragm 50 is a conical thin sheet located at the top of the device. Its center is bonded and fixed to the top of the voice coil frame 31, and its outer edge is elastically connected to the upper edge of the frame 10 through an annular fold. When the voice coil assembly 30 vibrates, the diaphragm 50 vibrates synchronously, pushing the air to produce sound.

[0030] Figure 5 A schematic diagram of the heat dissipation assembly 60 of the present invention is shown; Figure 6 A schematic diagram of the circumferential distribution of the heat dissipation component 60 of the present invention is shown; Figure 7 A schematic diagram of the air box 63 in the heat dissipation assembly 60 of the present invention is shown; the heat dissipation assembly 60 includes an air inlet 61, an air outlet 62, and an air box 63, wherein: An air inlet 61 is formed on the magnetic base plate 223 of the magnetic drive assembly 20. The air inlet 61 penetrates the upper and lower surfaces of the magnetic base plate 223, connecting the external space of the device with the internal cavity of the device. The air inlet 61 is located in the annular area between the central magnetic column 221 and the magnetic outer cylinder 222. There are multiple air inlets 61, which are evenly distributed along the circumference. Vent 62 is formed on the side wall of the basin frame 10. Vent 62 penetrates the inner and outer walls of the basin frame 10. Vent 62 is located below the elastic wave 40 and above the annular permanent magnet 21 in the axial direction. There are multiple vent 62, which are evenly distributed in the circumferential direction. The bellows 63 is located in the annular cavity between the lower part of the spider 40 and the upper part of the annular permanent magnet 21. The bellows 63 has a flared end 631 and a constricted end 632. The flared end 631 faces the center of the voice coil assembly 30 and communicates with the annular space above the magnetic gap 23. The top of the flared end 631 is connected to the inner surface of the spider 40, and the bottom of the flared end 631 is connected to the upper surface of the annular permanent magnet 21. The constricted end 632 faces the inner wall of the frame 10 and is connected to the exhaust port 62. The bellows 63 has pleats 633 along the axial direction.

[0031] Furthermore, the bellows 63 are provided in multiple sets, evenly distributed along the circumference, and the flared ends 631 of all the bellows 63 are adjacent to each other to form a ring structure surrounding the voice coil assembly 30.

[0032] During operation, the bellows 63 passively expands and contracts with the vibration of the spring wave 40, generating a pumping effect.

[0033] During the intake stroke: When the spider 40 moves upward, the spider 40 drives the flared end 631 of the bellows 63 to stretch axially, the folds 633 open, the internal volume of the bellows 63 expands, and negative pressure is generated; the negative pressure draws the hot air heated by the voice coil winding 32 at the magnetic gap 23 into the bellows 63 through the flared end 631; at the same time, external cold air is drawn in from the air inlet 61, flows upward across the surface of the voice coil assembly 30, takes away the heat and reaches above the magnetic gap 23 to replenish the gas drawn in by the bellows 63.

[0034] During the exhaust stroke: When the wave 40 moves downward, the wave 40 drives the flared end 631 of the bellows 63 to compress axially, the folds 633 close, the internal volume of the bellows 63 decreases, and the internal air pressure increases; the high pressure accelerates the hot air stored in the bellows 63 through the constricted end 632 and discharges it to the outside of the device from the exhaust port 62.

[0035] In the above, the arrangement of pleats 633 makes the volume change of the bellows 63 greater than that caused by the linear displacement of the spider 40 alone. When stretched, pleats 633 open to provide additional volume increment, and when compressed, pleats 633 close to provide additional volume decrement, thus producing a "pump amplification" effect, resulting in a larger pumping volume for the same spider amplitude. The flared end 631 faces the center of the voice coil assembly 30, directly facing the heat source, ensuring that hot air is preferentially drawn in; the constricted end 632 faces the exhaust port 62, and the converging flow channel accelerates the airflow during exhaust, forming a "jet" effect for more thorough exhaust.

[0036] Multiple sets of bellows 63 are evenly distributed circumferentially, with each bellows 63 independently corresponding to a segment of the arc length of the voice coil assembly 30, forming a 360° uniformly covered arrayed air pumping network; all the flared ends 631 are connected to each other to form a ring structure surrounding the voice coil assembly 30, which not only enhances the overall structure, but also divides the lower working chamber into multiple independent air pumping units circumferentially, eliminates airflow dead zones, ensures uniform heat dissipation in all parts of the voice coil assembly 30 circumferentially, and effectively avoids voice coil deformation and failure caused by local overheating. Example 2

[0037] This embodiment provides an electronic device, which is described here as a smartphone. The smartphone includes a device housing and a vibration sound-generating device, which is the vibration sound-generating device in Embodiment 1.

[0038] The vibration sound-generating device is installed inside the equipment housing. The equipment housing has an air inlet that communicates with the air inlet 61 and an air outlet that communicates with the air outlet 62.

[0039] It should be noted that this embodiment only uses a smartphone as an example to illustrate the specific structure of the electronic device, but the electronic device of the present invention is not limited to smartphones. The electronic device can also be a tablet computer, smart speaker, television, car audio system, portable Bluetooth speaker, conference phone, public address system, stage monitoring speaker, VR / AR headset, or any electronic product that includes a device housing and a vibration-generating sound device. Any electronic device that includes a device housing and the vibration-generating sound device of Embodiment 1, as long as the device housing has ventilation openings corresponding to and communicating with air inlets and outlets, falls within the protection scope of the present invention.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A vibration-generating device, comprising a frame, a magnetic drive assembly, a voice coil assembly, a spider, a diaphragm, and a heat dissipation assembly, wherein the magnetic drive assembly is connected to the frame, the voice coil assembly is vibratoryly suspended in the magnetic gap of the magnetic drive assembly, the spider is connected between the frame and the voice coil assembly, and the diaphragm is connected to the voice coil assembly, characterized in that: The bottom of the magnetic drive assembly has an air inlet, which connects the outside of the device with the inside of the device. The side wall of the basin frame is provided with an exhaust hole, which is located axially below the elastic wave. When the spider vibrates with the voice coil assembly, it drives the gas flow inside the device, so that external air is drawn into the device from the air inlet, flows over the surface of the voice coil assembly, and is discharged from the air outlet.

2. The vibration sound production device according to claim 1, wherein The air inlet is provided in multiple parts and is evenly distributed circumferentially at the bottom of the magnetic drive assembly.

3. The vibration sound production device of claim 2, wherein The ventilation holes are provided in multiple locations and are evenly distributed along the circumference of the side wall of the basin frame.

4. The vibration sound production device according to claim 3, wherein The magnetic drive assembly includes an annular permanent magnet and a magnetically conductive yoke. The magnetically conductive yoke includes a central magnetically conductive column, a magnetically conductive outer cylinder, and a magnetically conductive base plate. The central magnetically conductive column is located on a central axis. The annular permanent magnet is sleeved around the outer periphery of the central magnetically conductive column, and a magnetic gap is formed between the inner wall of the annular permanent magnet and the outer wall of the central magnetically conductive column. The magnetically conductive outer cylinder is sleeved around the outer periphery of the annular permanent magnet, and the magnetically conductive base plate connects the bottom end of the central magnetically conductive column to the bottom end of the magnetically conductive outer cylinder. The air inlet is opened on the magnetically conductive base plate.

5. The vibration sound production device according to claim 4, wherein It also includes a bellows located in an annular cavity between the lower part of the spider and the magnetic drive assembly. The bellows has a flared end facing the center of the voice coil assembly and a constricted end facing the exhaust port. The flared end communicates with the annular space above the magnetic gap, and the constricted end communicates with the exhaust port. The top of the flared end is connected to the inner surface of the spider, and the bottom of the flared end is connected to the upper surface of the annular permanent magnet. The bellows has folds along the axial direction.

6. The vibration-generating sound device according to claim 5, characterized in that, The bellows are provided in multiple sets, evenly distributed circumferentially, and the flared ends of all the bellows are connected to each other to form a ring structure surrounding the voice coil assembly.

7. The vibration-generating sound device according to claim 1, characterized in that, The voice coil assembly includes a voice coil skeleton and a voice coil winding; the axial length of the voice coil skeleton is greater than the axial depth of the magnetic gap, its upper end extends above the magnetic gap to connect the spider and the diaphragm, and its lower end extends below the magnetic gap near the air inlet.

8. An electronic device, characterized in that, The device includes a housing and a vibration-generating device as described in any one of claims 1 to 7; the vibration-generating device is installed inside the housing, and the housing has an air inlet communicating with the air inlet hole and an air outlet communicating with the air outlet hole.

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