Sound production module and electronic device

Abstract

The application discloses a sound production module and an electronic device, and belongs to the technical field of electronic product design. The disclosed sound production module comprises a first shell, a sound production body and a gas pressure balancing mechanism. The first shell has a containing cavity. The sound production body divides the containing cavity into a front cavity and a rear cavity. The sound production body comprises a diaphragm, and the gas pressure balancing mechanism is arranged in the rear cavity. In the case that the diaphragm vibrates towards the front cavity, the volume of the gas pressure balancing mechanism increases. In the case that the diaphragm vibrates towards the rear cavity, the volume of the gas pressure balancing mechanism decreases.

Description

Technical Field

[0001] This application belongs to the field of electronic product technology, specifically relating to a sound-generating module and an electronic device. Background Technology

[0002] With the rapid development of electronic devices, the various functions of electronic devices have been gradually improved. Most electronic devices are now equipped with sound-producing modules such as earpieces and speakers. Taking speakers as an example, most speakers currently use dynamic speakers. Dynamic speakers generally include a module housing and a speaker unit located inside the module housing. The speaker unit specifically includes components such as a diaphragm, coil, and magnet. During operation, a dynamic speaker passes an alternating current through the coil, causing the coil to move in a magnetic field, which in turn drives the diaphragm connected to the coil to vibrate towards the front and rear chambers of the speaker, thereby driving airflow to produce sound.

[0003] Specifically, in the operation of a moving-coil loudspeaker, because the module housing is relatively enclosed, when the diaphragm vibrates towards the front cavity, the volume of the rear cavity increases, creating negative pressure in the rear cavity and thus exerting a pulling force on the diaphragm. Conversely, when the diaphragm vibrates towards the rear cavity, the volume of the rear cavity decreases, increasing the pressure in the rear cavity and thus exerting a force on the diaphragm to move towards the front cavity. Therefore, when the diaphragm vibrates towards or behind the front cavity, it is always subject to a force that hinders its vibration. This reduces the diaphragm's ability to drive air movement, thereby lowering the sound performance of the speaker module.

[0004] In summary, the sound-generating modules involved in the relevant technologies suffer from poor sound-generating performance. Summary of the Invention

[0005] The purpose of this application is to provide a sound-generating module and an electronic device that can solve the problem of poor sound-generating performance in the sound-generating modules involved in related technologies.

[0006] This application provides a sound-generating module, including a first outer shell, a sound-generating body, and an air pressure balancing mechanism.

[0007] The first outer shell has a receiving cavity, and the sound-emitting body divides the receiving cavity into a front cavity and a rear cavity;

[0008] The sound-generating body includes a diaphragm, and the air pressure balancing mechanism is disposed in the rear cavity;

[0009] When the diaphragm vibrates toward the front cavity, the volume of the air pressure balancing mechanism increases; when the diaphragm vibrates toward the rear cavity, the volume of the air pressure balancing mechanism decreases.

[0010] This application provides an electronic device, including the sound-generating module described above.

[0011] In this embodiment, when the diaphragm vibrates towards the front cavity, the volume of the pressure balancing mechanism located in the rear cavity increases to compress the volume of gas in the rear cavity, thereby increasing the gas pressure in the rear cavity and generating a force to assist the diaphragm in vibrating towards the front cavity. When the diaphragm vibrates towards the rear cavity, the volume of the pressure balancing mechanism decreases to increase the volume of gas in the rear cavity, thereby decreasing the gas pressure in the rear cavity and generating a force to assist the diaphragm in vibrating towards the rear cavity. Therefore, this arrangement makes the diaphragm vibrate more easily, thereby improving the sound performance of the sound-generating module. Attached Figure Description

[0012] Figure 1 This is a partial cross-sectional structural schematic diagram of the sound-generating module disclosed in the embodiments of this application;

[0013] Figure 2 This is a schematic diagram of the air pressure balancing mechanism disclosed in the embodiments of this application.

[0014] Explanation of reference numerals in the attached figures:

[0015] 100 - First outer shell, 110 - Front cavity, 120 - Rear cavity, 121 - Main body cavity, 122 - Closed adjustment cavity;

[0016] 210-Diaphragm, 220-Coil, 230-Third magnetic component, 240-Fourth magnetic component, 250-First magnetic conductive sheet, 260-Second magnetic conductive sheet, 270-Third magnetic conductive sheet, 280-Second outer shell, 290-Elastic component;

[0017] 300 - Air pressure balance mechanism, 310 - First magnetic component, 320 - Second magnetic component, 330 - Support. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0019] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] The sound-generating module disclosed in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0021] Please refer to Figures 1-2 This application discloses a sound-generating module, which includes a first housing 100, a sound-generating body, and an air pressure balancing mechanism 300. Optionally, the sound-generating module can be a speaker module or an earpiece.

[0022] The first housing 100 provides a mounting base for other components of the sound-generating module. Specifically, the first housing 100 has a receiving cavity in which the sound-generating body and the air pressure balancing mechanism 300 are both located. The first housing 100 is used to protect the sound-generating body and the air pressure balancing mechanism 300.

[0023] The sound-generating body is the main component of the sound-generating module to realize the sound-generating function. It divides the housing into a front cavity 110 and a rear cavity 120. The air pressure balancing mechanism 300 is set in the rear cavity 120. The sound-generating body includes a diaphragm 210. When the sound-generating body is working, the diaphragm 210 vibrates to drive the air flow in the front cavity 110, thereby emitting sound outward.

[0024] The air pressure balancing mechanism 300 has the function of regulating the air pressure in the rear cavity 120. Specifically, when the diaphragm 210 vibrates towards the front cavity 110, the volume of the air pressure balancing mechanism 300 increases, which causes the gas in the rear cavity 120 to be in a compressed state, that is, the density of the gas in the rear cavity 120 increases, and thus the pressure in the rear cavity 120 increases. At this time, the diaphragm 210 is subjected to a force that causes it to vibrate towards the front cavity 110, which makes it easier for the diaphragm 210 to vibrate towards the front cavity 110. When the diaphragm 210 vibrates towards the rear cavity 120, the volume of the air pressure balancing mechanism 300 decreases, which causes the density of the gas in the rear cavity 120 to decrease, and thus the pressure in the rear cavity 120 decreases. At this time, the diaphragm 210 is subjected to a force that causes it to vibrate towards the rear cavity 120, which makes it easier for the diaphragm 210 to vibrate towards the rear cavity 120.

[0025] In this embodiment, when the diaphragm 210 vibrates towards the front cavity 110, the volume of the pressure balancing mechanism 300 located in the rear cavity 120 increases to compress the volume of the gas in the rear cavity 120, thereby increasing the pressure of the gas in the rear cavity 120 and generating a force to assist the diaphragm 210 in vibrating towards the front cavity 110. When the diaphragm 210 vibrates towards the rear cavity 120, the volume of the pressure balancing mechanism 300 decreases to increase the volume of the gas in the rear cavity 120, thereby decreasing the pressure of the gas in the rear cavity 120 and generating a force to assist the diaphragm 210 in vibrating towards the rear cavity 120. Therefore, this arrangement makes the diaphragm 210 vibrate more easily, thereby improving the sound performance of the sound-generating module.

[0026] In one embodiment, the air pressure balancing mechanism 300 can be specifically a shape memory alloy. When the shape memory alloy is energized, it is in a relaxed state, which increases the volume of the air pressure balancing mechanism 300. When the shape memory alloy is de-energized, it is in a contracted state, which decreases the volume of the air pressure balancing mechanism 300. However, since the shape memory alloy takes a long time to deform and the diaphragm 210 vibrates at a fast speed, this air pressure balancing mechanism 300 takes a long time to balance the air pressure in the front cavity 110 and the rear cavity 120.

[0027] In another embodiment, the air pressure balancing mechanism 300 includes a first magnetic element 310 and a second magnetic element 320. At least one of the first magnetic element 310 and the second magnetic element 320 is movably disposed in the rear cavity 120. The movability can be movement or rotation. A closed adjustment cavity 122 is formed between the first magnetic element 310 and the second magnetic element 320. The volume of the closed adjustment cavity 122 is adjustable. At least one of the first magnetic element 310 and the second magnetic element 320 is an electromagnetic element. When the diaphragm 210 vibrates toward the front cavity 110, the electromagnetic element is energized. The first magnetic element 310 and the second magnetic element 320 move away from each other under the action of repulsive force, so that the volume of the closed adjustment cavity 122 increases, thereby increasing the volume of the air pressure balancing mechanism 300.

[0028] When the diaphragm 210 vibrates towards the rear cavity 120, the electromagnetic component is energized, and the first magnetic component 310 and the second magnetic component 320 move closer together under the influence of attraction, thereby reducing the volume of the closed adjustment cavity 122 and consequently reducing the volume of the air pressure balancing mechanism 300. It can be seen that by passing an alternating current through the electromagnetic component, the magnetic field of the electromagnetic component can change in a short time, even if the first magnetic component 310 and the second magnetic component 320 move away from or closer together in a short time. Therefore, this arrangement makes it easier to assist the diaphragm 210 in vibrating.

[0029] Optionally, the first magnetic element 310 and the second magnetic element 320 can be misaligned with the diaphragm 210. However, in this case, the time it takes for the volume change of the rear cavity 120 caused by the interaction of the first magnetic element 310 and the second magnetic element 320 to act on the diaphragm 210 is relatively long.

[0030] Therefore, in another embodiment, the diaphragm 210, the first magnetic element 310, and the second magnetic element 320 are arranged sequentially in the direction of motion when the diaphragm 210 vibrates toward the rear cavity 120. That is, in the direction of motion when the diaphragm 210 vibrates toward the rear cavity 120, the projection of the diaphragm 210 intersects or coincides with the projection of the first magnetic element 310 and the second magnetic element 320. In this case, the volume change of the rear cavity 120 caused by the interaction of the first magnetic element 310 and the second magnetic element 320 can act on the diaphragm 210 in a shorter time, thereby making it easier for the air pressure balancing mechanism 300 to assist the diaphragm 210 in vibration. Furthermore, the first magnetic element 310 and the second magnetic element 320 can be positioned closer to the diaphragm 210, so that the volume change of the rear cavity 120 caused by the interaction of the first magnetic element 310 and the second magnetic element 320 can take effect more quickly.

[0031] Optionally, the first magnetic component 310 is movably disposed in the rear cavity 120, and the position of the second magnetic component 320 in the rear cavity 120 remains unchanged. In this case, the first magnetic component 310 can be an electromagnetic component, and the second magnetic component 320 can be a permanent magnet. When the first magnetic component 310 is energized, the first magnetic component 310 moves in the rear cavity 120 to change the volume of the air pressure balance mechanism 300. However, since the first magnetic component 310 is in motion, the power cord for energizing the first magnetic component 310 is relatively long, resulting in higher material costs. Furthermore, the longer power cord occupies more space in the sound-generating module, which is not conducive to the arrangement of other components.

[0032] Therefore, in another embodiment, the first magnetic element 310 can be a permanent magnet and the second magnetic element 320 can be an electromagnetic element. That is, the second magnetic element 320, which remains in the same position, can be set as an electromagnetic element. This results in a shorter power line for energizing the second magnetic element 320, and thus less space is occupied in the sound-generating module.

[0033] Optionally, at least one of the first magnetic component 310 and the second magnetic component 320 is movably disposed on the inner wall of the rear cavity 120. In this case, if the operator needs to disassemble and repair the first magnetic component 310 and the second magnetic component 320, the first magnetic component 310 and the second magnetic component 320 need to be disassembled from the inner wall of the rear cavity 120 in steps, which makes the disassembly process more cumbersome.

[0034] To simplify the operation, in another embodiment, the air pressure balancing mechanism 300 further includes a bracket 330, which is detachably disposed in the rear cavity 120. The first magnetic element 310 is slidably disposed in the bracket 330, and the second magnetic element 320 is connected to the bracket 330. The first magnetic element 310, the second magnetic element 320, and the bracket 330 form a closed adjustment cavity 122. Even if the first magnetic element 310 and the second magnetic element 320 are modularized through the bracket 330, when disassembling and repairing the first magnetic element 310 and the second magnetic element 320, the first magnetic element 310 and the second magnetic element 320 can be simultaneously removed from the rear cavity 120 by disassembling the bracket 330. Therefore, this arrangement makes the disassembly process simpler and faster.

[0035] Optionally, the rear cavity 120 can be a closed rear cavity, that is, the rear cavity 120 is not connected to the external environment of the sound-generating module. When the diaphragm 210 is in a static state, that is, when the diaphragm 210 is not working, if there is a large air pressure difference between the front cavity 110 and the rear cavity 120, that is, the air pressure of the external environment is much different from the air pressure of the rear cavity 120, this may cause the diaphragm 210 to bend, thereby posing a risk of failure to the diaphragm 210.

[0036] Therefore, to avoid the risk of diaphragm 210 failure, the sound module also includes a pressure detection component. Optionally, the pressure detection component can be a barometer or other component capable of detecting air pressure. A pressure sensor is located in the rear cavity 120, outside the closed adjustment cavity 122, to detect the pressure value of the rear cavity 120. When the diaphragm 210 is stationary and the detected pressure value of the rear cavity 120 is less than the pressure value of the front cavity 110, the volume of the pressure balancing mechanism 300 increases to increase the pressure of the rear cavity 120, thereby balancing the pressure of the front cavity 110 and the rear cavity 120. When the diaphragm 210 is stationary and the detected pressure value of the rear cavity 120 is greater than the pressure value of the front cavity 110, the volume of the pressure balancing mechanism 300 decreases to decrease the pressure of the rear cavity 120, thereby balancing the pressure of the front cavity 110 and the rear cavity 120. This results in a small or even zero pressure difference between the outer side (i.e., the front cavity 110) and the inner side (i.e., the rear cavity 120) of the diaphragm 210 when it is stationary. It should be noted that when the diaphragm 210 is in a static state, it means that the diaphragm 210 does not need to vibrate. At this time, the diaphragm 210 can be completely still. If the diaphragm 210 deforms due to the difference in air pressure on both sides, it also falls under the static state described here.

[0037] Optionally, since the air pressure detection device has a certain volume, for smaller sound modules, since the rear cavity 120 is already equipped with an air pressure balancing mechanism 300, the space left for installing the air pressure detection device is small, and there may even be a problem that it is not easy to install the air pressure detection device.

[0038] To avoid the aforementioned problems, in another embodiment, the rear cavity 120 includes a main cavity 121 and a closed adjustment cavity 122. The main cavity 121 is located outside the closed adjustment cavity 122, meaning the main cavity 121 is the chamber inside the diaphragm 210. The first outer shell 100 has a vent hole connected to the main cavity 121, thus connecting the external environment of the sound-generating module with the main cavity 121. This method of balancing the air pressure difference between the inside and outside of the diaphragm 210 through the vent hole avoids the risk of diaphragm 210 failure while not occupying space in the rear cavity 120. Optionally, the diameter of the vent hole can be less than or equal to 0.5 mm. In this case, the vent hole can achieve a relatively slow exchange of gas molecules between the external environment and the main cavity 121, while ensuring the sound-generating effect of the sound-generating module.

[0039] Optionally, when the operating frequency of the diaphragm 210 is less than the resonant frequency, i.e., when the diaphragm 210 is in a low-frequency vibration state, the amplitude of the diaphragm 210 is large, resulting in a large volume change in the rear cavity 120. In this case, the air pressure balancing mechanism 300 can be put into operation, i.e., the air pressure difference between the front cavity 110 and the rear cavity 120 can be balanced by the air pressure balancing mechanism 300. When the operating frequency of the diaphragm 210 is greater than the resonant frequency, i.e., when the diaphragm 210 is in a high-frequency vibration state, the amplitude of the diaphragm 210 is small, resulting in a small volume change in the rear cavity 120. In this case, the air pressure balancing mechanism 300 can also be put into operation. However, since the volume change in the rear cavity 120 caused by the diaphragm 210 vibrating at high frequency is small or even negligible, the balancing effect of the air pressure balancing mechanism 300 is not very significant.

[0040] Therefore, in another embodiment, when the diaphragm 210 is vibrating at a high frequency, the air pressure balancing mechanism 300 can be in a non-working state. This setting saves power consumption and extends the service life of the air pressure balancing mechanism 300.

[0041] In one embodiment, when the air pressure balancing mechanism 300 is in operation, the ratio between the volume change of the air pressure balancing mechanism 300 and the volume of the rear cavity 120 can be less than or equal to 10%, that is, the volume change of the rear cavity 120 caused by the air pressure balancing mechanism 300 can be less than or equal to 10% of the volume of the rear cavity 120; and / or, the ratio between the volume change of the air pressure balancing mechanism 300 and the volume change of the rear cavity 120 when the diaphragm 210 vibrates is less than or equal to 10%. For example, if the diaphragm 210 vibrates by 1 mm, the volume change of the rear cavity 120 is 1 cubic millimeter. In this case, the volume change of the air pressure balancing mechanism 300 can be less than or equal to 1 / 10 of a cubic millimeter. However, at this time, the auxiliary vibration effect of the air pressure balancing mechanism 300 on the diaphragm 210 is not obvious.

[0042] Therefore, in another embodiment, the ratio between the volume change value of the air pressure balancing mechanism 300 and the volume of the rear cavity 120 is greater than 10%; and / or, the ratio between the volume change value of the air pressure balancing mechanism 300 and the volume change value of the rear cavity 120 when the diaphragm 210 vibrates is greater than 10%. In this case, the air pressure balancing mechanism 300 has a more obvious effect on assisting the diaphragm 210 in vibrating, that is, the diaphragm 210 is easier to vibrate at this time.

[0043] In a further embodiment, the volume change value of the air pressure balancing mechanism 300 can be equal to the volume change value of the rear cavity 120; and / or, the volume change value of the air pressure balancing mechanism 300 is equal to the volume change value of the rear cavity 120 caused by the vibration of the diaphragm 210. In this case, when the diaphragm 210 vibrates to any position, the air pressure difference between the inner and outer sides of the diaphragm 210 is small or even zero. This setting can protect the diaphragm 210 while assisting the vibration of the diaphragm 210.

[0044] In a further embodiment, the rate of change of the volume of the rear cavity 120 can be greater than the vibration rate of the diaphragm 210. That is, when the diaphragm 210 vibrates toward the front cavity 110, the air pressure balancing mechanism 300 can make the pressure in the rear cavity 120 greater than the pressure in the front cavity 110, but the air pressure difference between the front cavity 110 and the rear cavity 120 should not be too large. When the diaphragm 210 vibrates toward the rear cavity 120, the air pressure balancing mechanism 300 can make the pressure in the rear cavity 120 less than the pressure in the front cavity 110, but the air pressure difference between the front cavity 110 and the rear cavity 120 should not be too large. In this case, the air pressure balancing mechanism 300 has a better auxiliary vibration effect on the diaphragm 210.

[0045] Optionally, the sound-generating body also includes a coil 220, a third magnetic element 230, and a fourth magnetic element 240. The coil 220 is connected to the diaphragm 210 and is arranged around the third magnetic element 230. There are at least two fourth magnetic elements 240, which are spaced apart and arranged around the third magnetic element 230. The coil 220 is located between the third magnetic element 230 and the fourth magnetic element 240. When the coil 220 is energized, the coil 220 is subjected to the magnetic force of the third magnetic element 230 and the fourth magnetic element 240 to drive the diaphragm 210 to vibrate toward the front cavity 110 and the rear cavity 120.

[0046] Optionally, since the magnetic fields of the third magnetic element 230 and the fourth magnetic element 240 are relatively divergent, resulting in fewer magnetic field lines passing through the coil 220 and thus a lower ability to drive the coil 220, the sound-generating body also includes a first magnetic sheet 250 and a second magnetic sheet 260. The first magnetic sheet 250 and the second magnetic sheet 260 are respectively disposed on the side of the third magnetic element 230 and the fourth magnetic element 240 near the diaphragm 210. Specifically, the first magnetic sheet 250 and the second magnetic sheet 260 can be stacked or bonded to the third magnetic element 230 and the fourth magnetic element 240, and the coil 220 is disposed between the first magnetic sheet 250 and the second magnetic sheet 260. The first magnetic sheet 250 and the second magnetic sheet 260 can converge more magnetic field lines to pass through the coil 220, thereby improving the driving capability of the coil 220. Optionally, the first magnetic sheet 250 and the second magnetic sheet 260 can be made of iron or stainless steel.

[0047] Optionally, the sound-generating body also includes a third magnetic sheet 270. The third magnetic sheet 270 is disposed on the side of the third magnetic element 230 and the fourth magnetic element 240 opposite to the first magnetic sheet 250 and the second magnetic sheet 260. Specifically, the third magnetic sheet 270 can be bonded to the third magnetic element 230 and the fourth magnetic element 240. The third magnetic sheet 270 not only gathers more magnetic field lines, but also provides good support for the third magnetic element 230 and the fourth magnetic element 240 even when the magnetic field between the third magnetic element 230 and the fourth magnetic element 240 flows rapidly. Optionally, the third magnetic sheet 270 can be made of iron or stainless steel.

[0048] Optionally, the sound-generating body also includes a second outer shell 280 and an elastic element 290. The second outer shell 280 is connected to the first outer shell 100 and provides a mounting base for other components of the sound-generating body. Specifically, the second outer shell 280 is elastically connected to the diaphragm 210 through the elastic element 290. When the diaphragm 210 vibrates, the elastic element 290 can appropriately limit the movement trajectory of the diaphragm 210, and the elastic deformation of the elastic element 290 can meet the needs of the diaphragm 210 for more different vibration amplitudes.

[0049] Optionally, when the diaphragm 210 vibrates in the low-frequency range, according to the resonance principle, the operating frequency of the air pressure balancing mechanism 300 also needs to be set in the low-frequency range. At this time, the operating frequency of the air pressure balancing mechanism 300 can be adjusted by increasing the mass of at least one of the first magnetic component 310 and the second magnetic component 320 and increasing the volume of the rear cavity 120. Specifically, the operating frequency of the air pressure balancing mechanism 300 is generally set to 100Hz to 400Hz.

[0050] Optionally, in the air pressure balancing mechanism 300, the current input of the electromagnetic components in the first magnetic component 310 and the second magnetic component 320 needs to be adjusted according to the current input to the coil 220. Specifically, the processor of the electronic device sends a sound signal to the first signal amplification device, which amplifies the sound signal into a first electrical signal and outputs the first electrical signal to the coil 220. The control chip of the electronic device detects the first electrical signal and outputs a second electrical signal to the second signal amplification device. The second signal amplification device outputs a third electrical signal based on the second electrical signal and outputs the third electrical signal to the electromagnetic components in the first magnetic component 310 and the second magnetic component 320. Therefore, this configuration can correlate the vibration amplitude of the diaphragm 210 with the volume change value of the air pressure balancing mechanism 300, so that the air pressure balancing mechanism 300 can better assist the vibration of the diaphragm 210.

[0051] Optionally, this application also discloses an electronic device, which includes the sound-generating module described above.

[0052] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A sound-generating module, characterized in that, Includes a first outer shell (100), a sound-generating body, an air pressure balancing mechanism (300), and an air pressure detection element. The first housing (100) has a receiving cavity, and the sound-emitting body divides the receiving cavity into a front cavity (110) and a rear cavity (120). The sound-generating body includes a diaphragm (210), and the air pressure balancing mechanism (300) is disposed in the rear cavity (120). When the diaphragm (210) vibrates toward the front cavity (110), the volume of the air pressure balancing mechanism (300) increases; when the diaphragm (210) vibrates toward the rear cavity (120), the volume of the air pressure balancing mechanism (300) decreases. The air pressure balancing mechanism (300) includes a first magnetic element (310) and a second magnetic element (320), at least one of the first magnetic element (310) and the second magnetic element (320) being movably disposed in the rear cavity (120), and a closed adjustment cavity (122) being formed between the first magnetic element (310) and the second magnetic element (320). At least one of the first magnetic element (310) and the second magnetic element (320) is an electromagnetic element. When the diaphragm (210) vibrates toward the front cavity (110), the first magnetic element (310) and the second magnetic element (320) move away from each other to increase the volume of the closed adjustment cavity (122); when the diaphragm (210) vibrates toward the rear cavity (120), the first magnetic element (310) and the second magnetic element (320) move closer to each other to decrease the volume of the closed adjustment cavity (122). The rear cavity (120) is a closed rear cavity, and the air pressure detection element is located in the rear cavity (120) and outside the closed adjustment cavity (122) for detecting the air pressure value of the rear cavity (120); When the diaphragm (210) is in a static state and the air pressure value of the rear cavity (120) is less than the air pressure value of the front cavity (110), the volume of the air pressure balancing mechanism (300) increases; When the diaphragm (210) is in a static state and the air pressure value of the rear cavity (120) is greater than the air pressure value of the front cavity (110), the volume of the air pressure balancing mechanism (300) decreases.

2. The sound-generating module according to claim 1, characterized in that, The diaphragm (210), the first magnetic element (310) and the second magnetic element (320) are arranged sequentially in the direction of motion when the diaphragm (210) vibrates toward the rear cavity (120).

3. The sound-generating module according to claim 1, characterized in that, The first magnetic element (310) is movably disposed in the rear cavity (120), the first magnetic element (310) is a permanent magnet, and the second magnetic element (320) is the electromagnetic element.

4. The sound-generating module according to claim 1, characterized in that, The air pressure balancing mechanism (300) further includes a bracket (330), which is detachably disposed in the rear cavity (120). The first magnetic element (310) is slidably disposed in the bracket (330), and the second magnetic element (320) is connected to the bracket (330). The first magnetic element (310), the second magnetic element (320), and the bracket (330) form the closed adjustment cavity (122).

5. The sound-generating module according to claim 1, characterized in that, The rear cavity (120) includes a main cavity (121) and a closed adjustment cavity (122). The main cavity (121) is located outside the closed adjustment cavity (122). The first outer shell (100) has a vent hole, which is connected to the main cavity (121).

6. The sound-generating module according to claim 1, characterized in that, When the operating frequency of the diaphragm (210) is less than the resonant frequency, the air pressure balancing mechanism (300) is in working state; when the operating frequency of the diaphragm (210) is greater than the resonant frequency, the air pressure balancing mechanism (300) is in non-working state.

7. The sound-generating module according to claim 1, characterized in that, The operating frequency of the pressure balancing mechanism (300) is 100Hz~400Hz.

8. An electronic device, characterized in that, The sound-generating module includes any one of claims 1-7.

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