Loudspeaker module, sound system and vehicle

Abstract

The application provides a loudspeaker module, a sound system and a vehicle. The loudspeaker module comprises a frame, a loudspeaker, a first vibration plate and a second vibration plate. The loudspeaker is installed at a first opening of the frame. The first vibration plate is installed at a second opening of the frame. The second vibration plate is installed at a vent of the frame. Through the design of the second vibration plate, the loudspeaker can be prevented from leaking energy outward from the back, and the first vibration plate can be driven to resonate with the loudspeaker to produce sound, so as to improve the low-frequency sound pressure, thereby reducing the overall size of the frame, and realizing the miniaturization design of the loudspeaker module while improving the low-frequency sound pressure.

Description

Technical Field

[0001] This application relates to the field of vehicle audio technology, specifically to a speaker module, an audio system, and a vehicle. Background Technology

[0002] In car speakers, there is a certain requirement for low-frequency sound output. However, in order to achieve low-frequency sound output, the speaker frame needs to be designed to be relatively large, which results in an excessively large overall size of the speaker module. Summary of the Invention

[0003] This application provides a speaker module, an audio system, and a vehicle. The speaker module includes a frame, a speaker, a first diaphragm, and a second diaphragm. The speaker is mounted in a first opening of the frame, the first diaphragm is mounted in a second opening of the frame, and the second diaphragm is mounted in a vent of the frame. The design of the second diaphragm can prevent energy leakage from the back of the speaker and drive the first diaphragm to resonate with the speaker to produce sound, thereby increasing the low-frequency sound pressure level and reducing the overall size of the frame. This achieves a miniaturized design of the speaker module while increasing the low-frequency sound pressure level.

[0004] In a first aspect, this application provides a loudspeaker module. The loudspeaker module includes: a frame having a first opening, a second opening, and a vent; a loudspeaker mounted on and covering the first opening; a first diaphragm mounted on and covering the second opening; and a second diaphragm mounted on the frame and blocking the vent. The loudspeaker, the first diaphragm, the second diaphragm, and the frame enclose a cavity. The natural resonant frequency f0_p1 of the first diaphragm and the natural resonant frequency f0_p2 of the second diaphragm satisfy the following:

[0005] f0_p1 < f0_p2.

[0006] In this application, by setting a second diaphragm to block the vent, energy leakage from the back of the speaker to the vent can be prevented. Simultaneously, the speaker can drive the second diaphragm to vibrate, thereby enabling the second diaphragm to drive the first diaphragm to resonate with the speaker and generate sound, thus recovering and utilizing sound energy and increasing the low-frequency sound pressure level of the speaker module. Furthermore, since the second and first diaphragms work together to increase the low-frequency sound pressure level, the required space of the cavity is reduced, thereby lowering the overall size of the speaker module.

[0007] In this application, the design of the vent allows the speaker module to utilize an infinitely large external space, thereby avoiding a reduction in low-frequency output due to a small chamber volume. Simultaneously, by using a second diaphragm to block the vent, external substances can be isolated, such as noise, dust, sewage, and smoke, thus reducing the impact of external substances on the speaker module and improving its reliability.

[0008] In this application, by designing f0_p1 < f0_p2, it is beneficial to direct more acoustic energy to the first vibrating plate, thereby driving the first vibrating plate to vibrate, thus improving the acoustic energy recovery efficiency and increasing the low-frequency sound pressure.

[0009] In some possible implementations, the natural resonant frequency f0_p1 of the first diaphragm, the natural resonant frequency f0_p2 of the second diaphragm, and the natural resonant frequency f0_s of the loudspeaker satisfy the following:

[0010] f0_p1 < f0_s < f0_p2.

[0011] In this implementation, by setting the natural resonant frequency of the first diaphragm to be lower than that of the speaker, the low-frequency extension of the speaker module can be improved, thereby increasing the low-frequency sound pressure level of the speaker module. By setting the natural resonant frequency of the second diaphragm to be higher than that of the speaker, some of the acoustic energy can be directed to the first diaphragm to excite it, thus increasing the equivalent vibration velocity of the first diaphragm. This prevents all the energy from being transferred to the outside through the second diaphragm and wasted, effectively improving the acoustic energy utilization rate of the speaker module and increasing its low-frequency sound pressure level.

[0012] In some possible implementations, the system resonant frequency f of the first vibrating plate b1 The system resonant frequency f with the second vibrating plate b2 satisfy:

[0013] f b1 <f b2 ;

[0014] Among them, the system resonant frequency f of the first vibrating plate b1 The equivalent vibrational mass of the first vibrating plate and the equivalent compliance of the second vibrating plate are inversely proportional. The system resonant frequency f of the second vibrating plate is... b2 The equivalent vibration mass and equivalent compliance of the second vibrating plate are inversely proportional.

[0015] In this implementation, the above design facilitates the first diaphragm to vibrate in phase with the loudspeaker and simultaneously output sound pressure, thereby increasing the total sound pressure and thus improving the low-frequency sound pressure of the loudspeaker module.

[0016] in, M ms_p1 M is the equivalent vibrating mass of the first vibrating plate. ms_p2 C is the equivalent vibrating mass of the second vibrating plate. ms_p2 This is the equivalent compliance of the second vibrating plate.

[0017] In some possible implementations, the equivalent vibrating mass M of the first vibrating plate ms The equivalent vibration mass M of _p1 and the second vibrating plate ms _p2 satisfies:

[0018] M ms _p1>M ms _p2.

[0019] In this implementation, through the above design, f can be made b1 to f b2 The wider range allows the first diaphragm and the loudspeaker to achieve a wider frequency band of in-phase vibration, which is beneficial to improving the efficiency of acoustic energy recovery and utilization of the loudspeaker module, thereby increasing the low-frequency sound pressure of the loudspeaker module.

[0020] In some possible implementations, the chamber is a closed space, which can prevent the leakage of acoustic energy within the chamber, thereby improving the efficiency of acoustic energy recovery and utilization, and thus increasing the low-frequency sound pressure.

[0021] In some possible implementations, there are multiple second openings and multiple first vibrating plates, with each of the multiple first vibrating plates corresponding to one of the multiple first openings.

[0022] In this implementation, by designing multiple first vibrating plates, it is beneficial to design first vibrating plates in multiple areas of the frame, thereby facilitating the use of multiple first vibrating plates in conjunction with second vibrating plates to achieve sound pressure energy recovery, thereby improving the low-frequency sound pressure of the speaker module.

[0023] In some possible implementations, at least two of the multiple first vibrating plates are arranged opposite each other.

[0024] In this implementation, at least two first tremor plates are designed to be arranged opposite to each other so that when the speaker module is working, the two first tremor plates arranged opposite to each other can generate vibrations in opposite directions, thereby canceling out the overall vibration of the speaker module, thus reducing the vibration of the speaker module when it is working, which is beneficial to improving the sound quality and user experience.

[0025] In some possible implementations, the ratio of the natural resonant frequencies of any two of the multiple first vibrating plates is in the range of 1 / 2 to 2, in order to balance engineering fluctuation tolerance and avoid excessive performance degradation.

[0026] In this implementation, the above design avoids the frequency band f of the speaker module. b1 ~f b2 Fluctuations can be avoided: the two relatively positioned first diaphragm plates are out of sync near the resonant frequency point, which would cause the vibrations between the two relatively positioned first diaphragm plates to be unable to cancel each other out, resulting in vibration of the speaker module.

[0027] In some possible implementations, the first vibrating plate and the second vibrating plate are arranged opposite each other.

[0028] In this implementation, by designing the first and second vibration plates to be arranged oppositely, it is beneficial for the first and second vibration plates to generate vibrations in opposite directions when the speaker module is working, thereby canceling out the overall vibration of the speaker module, thus reducing the vibration of the speaker module during operation and improving the sound quality experience.

[0029] In some possible implementations, the frame has a first groove located between the second opening and the vent, the first opening is located on the side wall of the first groove, and the speaker's sound-emitting surface faces the first diaphragm.

[0030] In this implementation, the above design allows the first diaphragm, the speaker, and the second diaphragm to be arranged in the same direction. This not only changes the structure of the speaker module, making the overall size of the speaker module smaller, but also allows the vibrations of the first diaphragm, the speaker, and the second diaphragm to cancel each other out when the speaker module is working. This cancels out the overall vibration of the speaker module, thereby reducing the vibration of the speaker module during operation and improving the sound quality and user experience.

[0031] In some possible implementations, the frame has a second recess, and a vent is located on the inner wall of the second recess. The speaker is positioned opposite the side wall of the second recess.

[0032] In this implementation, by setting a second groove, the second diaphragm can be located within the frame structure. This eliminates the need to further consider the installation space and vibration space of the second diaphragm when the speaker module is installed in other structures, which helps to improve the installation efficiency of the speaker module.

[0033] In some possible implementations, the second vibrating plate is disposed on the side wall of the second groove, and the second vibrating plate is disposed opposite to the first vibrating plate.

[0034] In this implementation, by designing the first and second vibration plates to be arranged oppositely, it is beneficial for the first and second vibration plates to generate vibrations in opposite directions when the speaker module is working, thereby canceling out the overall vibration of the speaker module, thus reducing the vibration of the speaker module during operation and improving the sound quality experience.

[0035] In some possible implementations, there are two vents, both located on the sidewall of the second recess, and both vents are arranged in the same direction as the speaker. There are also two second diaphragms, with each second diaphragm corresponding to one of the two vents.

[0036] In this implementation, the speaker can be positioned opposite to the second diaphragm installed at the vent. This design facilitates the vibration of the second diaphragm after the speaker operates, thereby causing the second diaphragm to vibrate the first diaphragm and recovering sound energy. Furthermore, the first diaphragm, the two second diaphragms, and the speaker can be arranged in the same direction, which helps to cancel out the overall vibration of the speaker module when it is operating, thus improving the user experience.

[0037] The ratio of the natural vibration frequencies of the two second diaphragm plates is in the range of 1 / 2 to 2, so as to take into account the engineering fluctuation tolerance and avoid excessive performance degradation, avoid fluctuations in the sensitivity of the speaker module, and avoid the following: the two second diaphragm plates are not synchronized near the resonance frequency point, which would cause the vibrations of the two relatively set second diaphragm plates to be unable to cancel each other, causing vibration of the speaker module.

[0038] In some possible implementations, there are two first openings, which are positioned opposite each other. There are also two speakers, with each speaker corresponding to one of the two first openings, and the sound-emitting surfaces of the two speakers facing opposite directions.

[0039] In this implementation, the above design enables the vibrations between the two speakers to cancel each other out when the speaker module is working, thereby reducing the overall vibration of the speaker module and improving the user experience.

[0040] The ratio of the natural vibration frequencies of the two speakers is between 1 / 2 and 2 to balance engineering tolerances and avoid excessive performance degradation, thus minimizing the impact on the sensitivity and bandwidth of the speaker module. b1 ~f b2 Fluctuations can occur and can be avoided: the two speakers are out of sync near the resonant frequency point, which causes the vibrations between the two speakers that are set up opposite each other to be unable to cancel each other out, causing the speaker module to vibrate.

[0041] In some possible implementations, the speaker module also includes a conduit installed in the frame and connected to a vent, thereby enabling the speaker module to communicate with the external space.

[0042] Secondly, this application provides an audio system. The audio system includes a baffle and a speaker module as described in the first aspect. The baffle has a through hole, the speaker module is mounted on the baffle, and a vent communicates with the through hole.

[0043] In this application, the speaker module can be connected to the through-hole via a vent, thereby utilizing the infinitely large space outside the baffle as the rear cavity space of the speaker module. This improves the low-frequency extension capability of the speaker module and ensures its low-frequency performance. Furthermore, this design reduces the size of the speaker module, facilitating a smaller overall size design and thus reducing the space occupied by the speaker module in the audio system, thereby improving the space utilization of the audio system.

[0044] Thirdly, this application provides a means of transportation. The means of transportation includes a vehicle and a speaker module as described in any of the first aspects, the speaker module being installed inside the vehicle and a vent communicating with the outside of the vehicle; or, the means of transportation includes a vehicle and an audio system as described in the second aspect, a baffle being installed in the vehicle and a through hole communicating with the outside of the vehicle.

[0045] In this application, the vent can connect to the outside of the vehicle, allowing the external space of the vehicle to form an infinitely large rear cavity space for the speaker module. This improves the low-frequency extension capability of the speaker module and ensures its low-frequency performance. Furthermore, this design reduces the size of the speaker module, facilitating a smaller overall size design and thus reducing the space occupied by the speaker module within the vehicle, thereby improving the space utilization of the vehicle. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of the vehicle provided in this application in some embodiments;

[0047] Figure 2A This is a schematic diagram of the speaker module provided in this application installed on a vehicle in some embodiments;

[0048] Figure 2B This is a schematic diagram of the speaker module provided in this application installed on a baffle in some embodiments;

[0049] Figure 3A yes Figure 2A The equivalent circuit diagram of the speaker module in the structure shown;

[0050] Figure 3B This is a schematic diagram showing how the equivalent impedance changes with frequency;

[0051] Figure 4A yes Figure 2A A schematic diagram of the equivalent impedance simulation curve of the speaker module in the structure shown.

[0052] Figure 4B yes Figure 2A A schematic diagram of the vibration velocity simulation curve of the speaker module in the structure shown.

[0053] Figure 4C yes Figure 2A A schematic diagram of the sound pressure response simulation curve of the loudspeaker module in the structure shown.

[0054] Figure 5 yes Figure 2A A schematic diagram comparing the sound pressure level simulation of the speaker module in the structure shown with that of the speaker module in the closed-box design.

[0055] Figure 6 This is a schematic diagram of the speaker module provided in this application installed on a vehicle in some other embodiments;

[0056] Figure 7 This is a schematic diagram of the speaker module provided in this application installed on a vehicle in some other embodiments;

[0057] Figure 8 This is a schematic diagram of the speaker module provided in this application installed on a vehicle in some other embodiments;

[0058] Figure 9 This is a schematic diagram of the speaker module provided in this application installed on a vehicle in some other embodiments. Detailed Implementation

[0059] For ease of understanding, the following terms are explained;

[0060] A loudspeaker is an electroacoustic transducer that converts electrical energy into sound energy and radiates it over long distances through the air. A moving-coil loudspeaker generally consists of a support system, a magnetic circuit system, and a vibration system. The support system is mainly the frame; the magnetic circuit system consists of magnets, soft magnetic pole pieces, and a yoke; and the vibration system includes a diaphragm, a voice coil, and a spider. The magnetic field generated by the magnetic circuit system exerts a force on the energized voice coil, causing it to vibrate. The voice coil then drives the diaphragm to vibrate, which in turn causes the air to vibrate, producing sound.

[0061] Magnetic circuit system: The magnetic circuit system of a loudspeaker consists of a magnet and upper and lower magnetic plates forming a closed magnetic circuit.

[0062] Vibrating plate: The vibrating part of a loudspeaker that produces sound. It is generally composed of a body and a surround. The body is usually made of paper, plastic or metal, and the surround is usually made of rubber or cloth. When working, it is driven by the voice coil to vibrate and compress air to produce sound.

[0063] Passive Radiator (PR): Similar to a vibrating plate, it generally consists of a body and folded rings. The body is usually made of paper, plastic or metal, and the folded rings are usually made of rubber or cloth. It does not require electrical signal to drive it during operation. It produces sound by the vibration of fluid and acoustic-structure coupling, hence the name passive radiator.

[0064] The embodiments of this application are described below with reference to the accompanying drawings.

[0065] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Multiple" refers to at least two.

[0066] The directional terms mentioned in the embodiments of this application, such as "upper", "lower", "inner", "outer", "top", "bottom", "side", etc., are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0067] In the embodiments of this application, the relative positional relationships mentioned, such as parallel, perpendicular, and aligned, are defined in relation to the current technological level, rather than being absolutely strict. Slight deviations are permissible; approximations of parallelism, perpendicularity, or alignment are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 and 10 degrees. Similarly, "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80 and 100 degrees.

[0068] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature.

[0069] Let me first introduce some application scenarios of speaker module 1.

[0070] Please refer to the following: Figure 1 and Figure 2A , Figure 1 This is a schematic diagram of the structure of the vehicle 100 provided in this application in some embodiments; Figure 2AThis is a schematic diagram of the speaker module 1 provided in this application installed on the carrier 20 in some embodiments.

[0071] Please see Figure 1 In some embodiments, the vehicle 100 can be a vehicle, rail vehicle, ship, aircraft, etc. The vehicle can be, but is not limited to, a sedan, multi-purpose vehicle (MPV), sport / suburban utility vehicle (SUV), off-road vehicle (ORV), pickup truck, van, bus, truck, etc. Figure 1 In this embodiment, the vehicle 100 is described as an example. Of course, other types of vehicles 100 can also adopt a similar structure, which will not be described in detail below.

[0072] For example, vehicle 100 may include a vehicle 20 and a speaker module 1. The speaker module 1 may be installed inside the vehicle 20, specifically in multiple locations within the vehicle 20, to enable audio playback in different areas of the vehicle 100. For instance, the speaker module 1 may be installed in the front trunk, door panels, rear trunk, spare tire compartment, etc. Figure 1 The speaker module 1 is illustrated using a dashed box.

[0073] Please refer to the following: Figure 1 and Figure 2A In some embodiments, the speaker module 1 may have a vent 111 that connects to the outside of the vehicle 20, allowing the external space of the vehicle 100 to form an infinitely large rear cavity space for the speaker module 1. This improves the low-frequency extension capability of the speaker module 1 and ensures its low-frequency performance. Furthermore, this design reduces the size of the speaker module 1, facilitating a smaller overall size design and reducing the space occupied by the speaker module 1 within the vehicle 100, thus improving the space utilization of the vehicle 100.

[0074] It should be noted that, Figure 2A The right-side marking of the vehicle 20 refers to the external space of the vehicle 100, while the left-side marking of the vehicle 20 refers to the internal space of the vehicle 100.

[0075] In some examples, the carrier 20 may have an opening 201 that can be directly connected to the vent 111 of the speaker module 1.

[0076] In other examples, the vehicle 20 can connect the vent 111 of the speaker module 1 to the external space through the pipe 30, wherein the pipe 30 can be the structure of the speaker module 1 itself, or the pipe 30 can be the structure of the vehicle 20 itself, or the pipe 30 can include two parts, one part of the structure of the speaker module 1 itself and the other part of the structure of the vehicle 20 itself.

[0077] Please see Figure 2B , Figure 2B This is a schematic diagram of the speaker module 1 provided in this application installed on the baffle 2 in some embodiments.

[0078] This application also provides an audio system 10. In some embodiments, the audio system 10 may include a speaker module 1 and a baffle 2, the baffle 2 may have a through hole 21, the speaker module 1 may be mounted on the baffle 2, and the vent 111 communicates with the through hole 21.

[0079] In this embodiment, the speaker module 1 can be connected to the through hole 21 through the vent 111, so that the infinitely large space outside the baffle 2 can be used as the rear cavity space of the speaker module 1, thereby improving the low-frequency extension capability of the speaker module 1 and ensuring the low-frequency performance of the speaker module 1. In addition, this design allows the speaker module 1 to be smaller, which is conducive to reducing the overall size of the speaker module 1, thereby reducing the space occupied by the speaker module 1 in the audio system and improving the space utilization of the audio system.

[0080] In some examples, the through hole 21 of the baffle 2 can be directly connected to the vent 111 of the speaker module 1.

[0081] In other examples, the baffle 2 can be connected to the vent 111 and the through hole 21 of the speaker module 1 via the pipe 30. The pipe 30 can be the speaker module 1 itself, or the pipe 30 can be the baffle 2 itself, or the pipe 30 can include two parts, one part of the speaker module 1 itself and the other part of the baffle 2 itself.

[0082] The audio system can be applied to vehicles, homes, audio-visual entertainment venues, public office spaces, etc.

[0083] In some examples, the audio system is applied to vehicle 100, and the baffle 2 can be a plate at a certain point on vehicle 20.

[0084] In other examples, the audio system is applied to the clamp, while the baffle 2 can be a wall of a house, or a piece of furniture, etc.

[0085] In other examples, the audio system is used in audio-visual entertainment venues, such as cinemas, and the baffle 2 can be a noise reduction panel, wall, etc.

[0086] In other examples, the audio system is used in public office spaces, and the baffle 2 can be a wall, the casing of an office display screen, etc.

[0087] It should be noted that the baffle 2 of the audio system can be an independent structure, or it can reuse the structure in the application scenario according to different application scenarios.

[0088] The specific design of speaker module 1 will be introduced next.

[0089] Please continue reading. Figure 2A In some embodiments, the speaker module 1 may include a frame 11, a speaker 12, a first diaphragm 13, and a second diaphragm 14. The frame 11 may have a first opening 112, a second opening 113, and a vent 111. The speaker 12 may be mounted in and cover the first opening 112. The first diaphragm 13 may be mounted in and cover the second opening 113. The second diaphragm 14 may be mounted in and block the vent 111. The speaker 12, the first diaphragm 13, the second diaphragm 14, and the frame 11 enclose a cavity 114.

[0090] In this embodiment, by setting the second vibrating plate 14 to block the vent 111, energy leakage from the back of the speaker 12 to the vent 111 can be prevented. At the same time, the speaker 12 can drive the second vibrating plate 14 to vibrate, thereby enabling the second vibrating plate 14 to drive the first vibrating plate 13 to resonate with the speaker 12 and generate sound, so as to recover and utilize sound energy, thereby increasing the low-frequency sound pressure of the speaker module 1. Meanwhile, since the second vibrating plate 14 and the first vibrating plate 13 work together to increase the low-frequency sound pressure, the required space of the cavity 114 is reduced, thereby reducing the overall size of the speaker module 1.

[0091] For example, the overall size of the speaker module 1 provided in this application can be reduced by more than 70% compared to the overall size of a speaker module with a closed-box design.

[0092] Furthermore, in this embodiment, the design of the vent 111 allows the speaker module 1 to utilize an infinitely large external space, thereby preventing the chamber 114 from being too small and reducing low-frequency output. Simultaneously, by blocking the vent 111 with the second diaphragm 14, external substances can be blocked, such as noise, dust, sewage, and smoke, thereby reducing the impact of external substances on the speaker module 1 and improving its reliability.

[0093] It should be noted that the second diaphragm 14 blocking the vent 111 means that the second diaphragm 14 can form a barrier to the vent 111. In some examples, the second diaphragm 14 can be installed at the vent 111 to cover it. In other examples, the second diaphragm 14 can be installed on the side of the vent 111 closer to the speaker 12, separating the space on the side of the second diaphragm 14 closer to the vent 111 from the space on the side away from the vent 111. In still other examples, the second diaphragm 14 can be installed on the side of the vent 111 away from the speaker 12. In this case, the second diaphragm 14 is located on the outside of the frame 11 to separate the vent 111 from the external space. Understandably, the placement of the second diaphragm 14 can be adjusted according to the actual application, as long as the second diaphragm 14 has sufficient installation and working space.

[0094] It should be noted that in some examples, the first opening 112 and the second opening 113 can be set alternately, for example, they can be set alternately on the same side of the frame 11, or they can be set alternately on different sides of the frame 11; in other examples, the first opening 112 and the second opening 113 can be connected.

[0095] For example, both the first diaphragm 13 and the second diaphragm 14 can be passive diaphragms, which is beneficial for realizing the recovery and utilization of acoustic energy of the loudspeaker module 1. In some other embodiments, at least one of the first diaphragm 13 and the second diaphragm 14 can be an active diaphragm. For example, at least one of the first diaphragm 13 and the second diaphragm 14 is externally connected to an excitation source so that at least one of the first diaphragm 13 and the second diaphragm 14 can vibrate actively. On this basis, the loudspeaker 12, the first diaphragm 13, and the second diaphragm 14 work together to realize acoustic energy recovery and improve low-frequency sound pressure.

[0096] For example, the chamber 114 can be a closed space, which can prevent the leakage of sound energy in the chamber 114, thereby improving the efficiency of sound energy recovery and utilization, and thus increasing the low-frequency sound pressure.

[0097] In some embodiments, the natural resonant frequency f0_p1 of the first vibrating plate 13 and the natural resonant frequency f0_p2 of the second vibrating plate 14 can satisfy: f0_p1 < f0_p2, which is beneficial for more sound energy to be directed to the first vibrating plate 13, thereby driving the first vibrating plate 13 to vibrate, thereby improving the sound energy recovery efficiency and increasing the low-frequency sound pressure.

[0098] The natural resonant frequency f0_p1 of the first diaphragm 13, the natural resonant frequency f0_p2 of the second diaphragm 14, and the natural resonant frequency f0_s of the loudspeaker 12 satisfy the following: f0_p1 < f0_s < f0_p2.

[0099] In this embodiment, by setting the natural resonant frequency of the first diaphragm 13 to be lower than that of the speaker 12, the low-frequency extension of the speaker module 1 can be improved, thereby increasing the low-frequency sound pressure level of the speaker module 1. By setting the natural resonant frequency of the second diaphragm 14 to be higher than that of the speaker 12, some of the acoustic energy can be directed to the first diaphragm 13 to excite it to work, thereby increasing the equivalent vibration velocity of the first diaphragm 13. This avoids all the energy being transferred to the outside through the second diaphragm 14 and wasted, effectively improving the acoustic energy utilization rate of the speaker module 1 and increasing the low-frequency sound pressure level of the speaker module 1.

[0100] In some embodiments, the system resonant frequency f of the first vibrating plate 13 b1 The system resonant frequency f with the second vibrating plate 14 b2 Satisfy: f b1 <f b2 Among them, the system resonant frequency f of the first vibrating plate 13 is... b1 The equivalent vibration mass of the first vibrating plate 13 and the equivalent compliance of the second vibrating plate 14 are inversely proportional, and the system resonant frequency f of the second vibrating plate 14 is... b2 The equivalent vibration mass and equivalent compliance of the second vibrating plate 14 are inversely proportional.

[0101] In this embodiment, the above design facilitates the in-phase vibration of the first vibrating plate 13 and the speaker 12, while simultaneously outputting sound pressure, thereby increasing the total sound pressure after superposition and thus improving the low-frequency sound pressure of the speaker module 1.

[0102] It should be noted that the system resonant frequency refers to the resonant frequency when the speaker module 1 is working.

[0103] For example, Among them, M ms_p1 M is the equivalent vibrating mass of the first vibrating plate 13. ms_p2 C is the equivalent vibration mass of the second vibrating plate 14. ms_p2 This is the equivalent compliance of the second vibrating plate 14.

[0104] It should be noted that the system resonant frequency f of the first vibrating plate 13 b1 The value of the system resonant frequency f of the second vibrating plate 14 b2 The value can be calculated or approximated using the above formula; in other words, the system resonance frequency f of the first vibrating plate 13 mentioned above... b1 The value of the system resonant frequency f of the second vibrating plate 14 b2The formula for calculating the value can be either equal or approximately equal. In other words, in speaker module 1, the system resonant frequency f of the first diaphragm 13 is... b1 It mainly occurs due to the parallel connection of the equivalent vibrating mass of the first vibrating plate 13 and the equivalent compliance of the second vibrating plate 14, with the system resonant frequency f of the second vibrating plate 14 being the system resonant frequency. b2 It mainly occurs due to the equivalent vibration mass of the second vibrating plate 14 and the equivalent compliance of the second vibrating plate 14.

[0105] Wherein, the equivalent vibration mass M of the first vibrating plate 13 ms The equivalent vibration mass M of _p1 and the second vibrating plate 14 ms _p2 satisfies: M ms _p1>M ms _p2.

[0106] In this embodiment, through the above design, f can be made b1 to f b2 The range is larger, which enables the first diaphragm 13 and the loudspeaker 12 to achieve a wider frequency band of in-phase vibration, which is beneficial to improve the efficiency of sound energy recovery and utilization of the loudspeaker module 1, thereby increasing the low-frequency sound pressure of the loudspeaker module 1.

[0107] The parameter design described above will be explained in detail below.

[0108] Please refer to the following: Figure 3A and Figure 3B , Figure 3A yes Figure 2A The equivalent circuit diagram of speaker module 1 in the structure shown; Figure 3B This is a schematic diagram showing how the equivalent impedance changes with frequency.

[0109] exist Figure 3A In the middle, M ms _s is the equivalent vibrating mass of loudspeaker 12, C ms _s represents the equivalent compliance of speaker 12, R ms _s represents the equivalent damping of speaker 12, M ms _p1 is the equivalent vibrating mass of the first vibrating plate 13, C ms _p1 represents the equivalent compliance of the first vibrating plate 13, R ms _p1 is the equivalent damping of the first vibrating plate 13, M ms _p2 is the equivalent vibrating mass of the second vibrating plate 14, C ms _p2 represents the equivalent compliance of the second vibrating plate 14, R ms _p2 is the equivalent damping of the second vibrating plate 14, V s V is the vibration velocity of the diaphragm of speaker 12. p1 V is the vibration velocity of the first vibrating plate 13.p2 C represents the vibration velocity of the second vibrating plate 14. b F is the equivalent volume of chamber 114, and F is the excitation source of loudspeaker 12.

[0110] Based on the principle, the equivalent circuit, and its equivalent impedance, we know that the equivalent impedance satisfies:

[0111]

[0112] The equivalent impedance of the loudspeaker 12, the equivalent impedance of the first diaphragm 13, and the equivalent impedance of the second diaphragm 14 can all be calculated according to the above formula.

[0113] When wM ms =wC ms When the equivalent impedance is at its minimum, the frequency at this point is defined as the natural resonant frequency f0. The natural resonant frequencies of the loudspeaker 12, the first diaphragm 13, and the second diaphragm 14 are all determined by their inherent equivalent vibrating mass and equivalent compliance, as expressed by the following formula:

[0114]

[0115] Combining the above formula and Figure 3B It can be seen that when the frequency is less than f0, the equivalent impedance Z ms Mainly composed of equivalent compliance C ms The determination, and the equivalent impedance Z ms It decreases as the frequency increases; when the frequency equals f0, the equivalent impedance Z ms Minimum; at frequencies greater than f0, the equivalent impedance Z ms Mainly composed of equivalent vibrating mass M ms The determination, and the equivalent impedance Z ms It increases with increasing frequency.

[0116] Depend on Figure 3A It can be seen that the equivalent circuit of the loudspeaker 12 is connected in series with the equivalent circuits of the first diaphragm 13 and the second diaphragm 14, and the equivalent circuits of the first diaphragm 13 and the second diaphragm 14 are connected in parallel. Therefore, when the excitation source of the loudspeaker 12 excites the loudspeaker 12 to work, the equivalent vibration velocity V of the loudspeaker 12 is... s The current will be diverted to the equivalent circuit of the first vibrating plate 13 to form V. p1 And the current is diverted to the equivalent circuit of the second vibrating plate 14 to form V. p2 The equivalent vibration velocity can be regarded as current. In a parallel circuit, the smaller the resistance of the branch, the larger the current can be obtained. Similarly, the smaller the equivalent impedance of the branch, the larger the equivalent vibration velocity can be obtained.

[0117] Simultaneously, the influence of the equivalent impedance of the equivalent circuit of the first diaphragm 13 and the equivalent impedance of the equivalent circuit of the second diaphragm 14 on the speaker 12 also needs to be considered. The larger the equivalent impedance of the equivalent circuit of the first diaphragm 13 and the equivalent impedance of the equivalent circuit of the second diaphragm 14, the larger the overall impedance of the speaker module 1, which will affect the vibration speed of the speaker 12. Among them, the vibration speed is inversely proportional to the equivalent impedance, and the sound pressure level is directly proportional to the vibration speed. The overall sound pressure level of the speaker module 1 needs to consider the superposition of the sound pressure level of the speaker 12 and the sound pressure level of the first diaphragm 13. Therefore, in order to improve the overall output sound pressure level of the speaker module 1, it is necessary not only to consider the parameters of the speaker 12, the first diaphragm 13 and the second diaphragm 14 working independently in the speaker module 1, but also to consider the coordinated work between the speaker 12, the first diaphragm 13 and the second diaphragm 14.

[0118] Specifically, please refer to the following: Figures 4A to 4C , Figure 4A yes Figure 2A A schematic diagram of the equivalent impedance simulation curve of speaker module 1 in the structure shown. Figure 4B yes Figure 2A A schematic diagram of the vibration velocity simulation curve of speaker module 1 in the structure shown. Figure 4C yes Figure 2A A schematic diagram of the sound pressure response simulation curve of speaker module 1 in the structure shown.

[0119] Among them, Figure 4A In the diagram, the solid line represents the curve showing the change of the equivalent impedance of the loudspeaker 12 with frequency, the dashed line represents the curve showing the change of the equivalent impedance of the first diaphragm 13 with frequency, and the dotted line represents the curve showing the change of the equivalent impedance of the second diaphragm 14 with frequency. Figure 4B In the diagram, the solid line represents the curve showing the vibration velocity of the loudspeaker 12 as a function of frequency; the dashed line represents the curve showing the vibration velocity of the first diaphragm 13 as a function of frequency; and the dotted line represents the curve showing the vibration velocity of the second diaphragm 14 as a function of frequency. Figure 4C In the diagram, the solid line represents the curve showing the superposition of the sound pressure of the loudspeaker 12 and the first diaphragm 13 as a function of frequency; the dotted line represents the curve showing the sound pressure of the first diaphragm 13 as a function of frequency; and the dashed line represents the curve showing the sound pressure of the loudspeaker 12 as a function of frequency.

[0120] When speaker module 1 is working, when the operating frequency f < f b1 At that time, by Figure 4A It can be concluded that the equivalent impedance of the first vibrating plate 13 is less than the equivalent impedance of the second vibrating plate 14; from Figure 4B It can be concluded that the vibration velocity of the first vibrating plate 13 gradually increases, and at f = f b1 The maximum value is reached in the vicinity; by Figure 4C It can be concluded that the vibration phases of the first diaphragm 13 and the speaker 12 are opposite, and the sound pressure of the speaker 12 is canceled out, so that the total sound pressure of the speaker module 1 is reduced.

[0121] When f b1 ≤f≤f b2 At that time, by Figure 4A It can be concluded that the equivalent impedance of the first vibrating plate 13 gradually increases and is greater than the equivalent impedance of the second vibrating plate 14, where f = f b1 At this time, the first vibrating plate 13 and the second vibrating plate 14 resonate, and the equivalent impedance of the loudspeaker 12 is at its maximum, when f = f b2 At this time, the second vibrating plate 14 resonates, and its equivalent impedance drops to its minimum; Figure 4B It can be concluded that: the vibration velocity of the first vibrating plate 13 gradually decreases, and the vibration velocity of the second vibrating plate 14 gradually decreases; the vibration velocity of the loudspeaker 12 first increases and then decreases, and at f = f b1时 The vibration velocity is the lowest; by Figure 4C It can be concluded that the phase of the first diaphragm 13 and the speaker 12 is basically the same, and they can output sound pressure outward at the same time, thereby increasing the sound pressure of the speaker module 1 after superposition.

[0122] At that time f > f b2 At that time, by Figure 4A It can be concluded that as the equivalent impedance of the first diaphragm 13 continues to increase, its effect decreases; the equivalent impedance of the second diaphragm 14 also continues to increase, which will affect the output of the speaker 12. Figure 4B It can be concluded that the vibration velocity of the first diaphragm 13 continuously decreases, its effect diminishes, and the vibration velocity of the speaker 12 also continuously decreases; from Figure 4C It can be concluded that the sound pressure of the first diaphragm 13 is much lower than that of the loudspeaker 12, and the sound pressure effect of the first diaphragm 13 is reduced at this time.

[0123] From the above analysis, it can be seen that when f b1 ≤f≤f b2 At that time, the sound pressure of the first vibrating plate 13 and the sound pressure of the speaker 12 can be positively superimposed, thereby increasing the overall sound pressure of the speaker module 1, so the frequency band f b1 ~f b2 The first vibrating plate 13 can reach the operating frequency band of sound pressure energy recovery, therefore, by designing f b1 The smaller the value of f, b2 The larger the value of f, the wider the frequency range that allows the first diaphragm 13 and the loudspeaker 12 to operate in phase. From the above f... b1 and f b2 As can be seen from the formula, the equivalent vibration mass of the second vibrating plate 14 should be as small as possible, while the vibration mass of the first vibrating plate 13 should be appropriately large, which is beneficial to achieving f.b1 The value of f decreases b2 The value increases, thus widening the frequency band in which the first diaphragm 13 and the loudspeaker 12 operate in phase. For example, when designing M... ms _p1>M ms _p2. Similarly, the appropriate small equivalent compliance of the second diaphragm 14 and the appropriate large equivalent compliance of the first diaphragm 13 are also conducive to widening the frequency band in which the first diaphragm 13 and the loudspeaker 12 work in phase.

[0124] In addition, in order for the first diaphragm 13 to enhance the low-frequency extension of the speaker module 1, the natural resonant frequency of the first diaphragm 13 needs to be lower than the natural resonant frequency of the speaker 12. Therefore, the design of f0_p1 < f0_s < f0_p2 is beneficial to the low-frequency extension of the speaker module 1.

[0125] Please see Figure 5 , Figure 5 yes Figure 2A A schematic diagram showing the sound pressure simulation comparison between speaker module 1 in the structure shown and the speaker module with a closed-box design.

[0126] In this diagram, the solid line represents the curve of sound pressure level of the speaker module 1 provided in this application changing with frequency, and the wire line represents the curve of sound pressure level of the speaker module with closed-box design changing with frequency. It should be noted that a speaker module with closed-box design means that the frame of the speaker module is only provided with a first opening for mounting the speaker, the frame and the speaker form a sealed cavity, and no first diaphragm 13 and second diaphragm 14 are provided.

[0127] Depend on Figure 5 It can be seen that: in f b1 ≤f≤f b2 Within the specified range, the sound pressure level of the speaker module 1 provided in this application is significantly higher than that of the speaker module with a closed-box design. Therefore, the speaker module 1 provided in this application can achieve an increase in low-frequency sound pressure level.

[0128] The following describes some embodiments of the speaker module 1 provided in this application.

[0129] The speaker module 1 is shown installed on the carrier 20. It can be understood that the speaker module 1 can be used in other application scenarios. The speaker module 1 is installed on the carrier 20 for illustration only and does not limit the application environment of the speaker module 1.

[0130] Please see Figure 6 , Figure 6 This is a schematic diagram of the speaker module 1 provided in this application installed on the carrier 20 in some other embodiments.

[0131] In some embodiments, there may be multiple second openings 113 and multiple first vibrating plates 13, with each of the multiple first vibrating plates 13 corresponding to a single second opening 113.

[0132] In this embodiment, by designing multiple first vibrating plates 13, it is advantageous to design first vibrating plates 13 in multiple areas of the frame 11, thereby facilitating the use of multiple first vibrating plates 13 in conjunction with second vibrating plates 14 to achieve sound pressure energy recovery, thereby improving the low-frequency sound pressure of the speaker module 1.

[0133] For example, at least two of the plurality of first vibrating plates 13 are arranged opposite each other.

[0134] It should be noted that relative arrangement means that at least part of one first vibrating plate 13 is directly opposite to another first vibrating plate 13, and does not limit the center lines of the two first vibrating plates 13 to coincide. It can be understood that when the two first vibrating plates 13 are completely directly opposite each other, their center lines coincide.

[0135] In this embodiment, by designing at least two first oscillating plates 13 arranged opposite to each other, the two first oscillating plates 13 arranged opposite to each other can generate vibrations in opposite directions when the speaker module 1 is working, thereby canceling out the overall vibration of the speaker module 1, thereby reducing the vibration of the speaker module 1 when it is working, which is beneficial to improving the sound quality and user experience.

[0136] Among them, the ratio of the natural vibration frequencies of any two of the multiple first vibrating plates 13 is in the range of 1 / 2 to 2, in order to balance engineering fluctuation tolerance and avoid excessive performance degradation, and to avoid the frequency band f of the speaker module 1. b1 ~f b2 Fluctuations occur and can be avoided: the two relatively arranged first diaphragm plates 13 are out of sync near the resonant frequency point, which causes the vibrations between the two relatively arranged first diaphragm plates 13 to be unable to cancel each other out, causing the speaker module 1 to vibrate.

[0137] For example, the ratio of the natural vibration frequencies of any two of the plurality of first vibrating plates 13 can be, but is not limited to, 1 / 2, or 2 / 3, or 1, or 3 / 2, or 2, or other values ​​between 1 / 2 and 2.

[0138] Please see Figure 7 , Figure 7 This is a schematic diagram of the speaker module 1 provided in this application installed on the carrier 20 in some other embodiments.

[0139] In some embodiments, the first vibrating plate 13 may be disposed opposite to the second vibrating plate 14.

[0140] It should be noted that relative arrangement means that at least part of the first vibrating plate 13 and the second vibrating plate 14 are directly opposite each other, and does not limit the center line of the first vibrating plate 13 and the center line of the second vibrating plate 14 to coincide. It can be understood that when the first vibrating plate 13 and the second vibrating plate 14 are completely directly opposite each other, their center lines can coincide.

[0141] In this embodiment, by designing the first vibration plate 13 and the second vibration plate 14 to be arranged oppositely, it is beneficial that when the speaker module 1 is working, the first vibration plate 13 and the second vibration plate 14 generate vibrations in opposite directions, thereby canceling out the overall vibration of the speaker module 1, thus reducing the vibration of the speaker module 1 during operation and improving the sound quality experience.

[0142] For example, the frame 11 may have a first groove 115, which may be located between the second opening 113 and the vent 111. The first opening 112 is provided on the side wall of the first groove 115, and the sound output surface of the speaker 12 faces the first diaphragm 13.

[0143] In this embodiment, through the above design, the first diaphragm 13, the speaker 12, and the second diaphragm 14 can be arranged in the same direction in sequence. This not only changes the structure of the speaker module 1 to make the overall size of the speaker module 1 smaller, but also allows the vibrations of the first diaphragm 13, the speaker 12, and the second diaphragm 14 to cancel each other out when the speaker module 1 is working. This cancels out the overall vibration of the speaker module 1, thereby reducing the vibration of the speaker module 1 when it is working and improving the sound quality experience.

[0144] It should be noted that the first diaphragm 13, the loudspeaker 12 and the second diaphragm 14 are arranged in the same direction, which means that in that direction, the first diaphragm 13, the loudspeaker 12 and the second diaphragm 14 overlap at least partially with each other, and does not mean that they overlap completely with each other.

[0145] The design of the first groove 115 allows the speaker 12 to emit sound through the opening of the first groove 115.

[0146] Please see Figure 8 , Figure 8 This is a schematic diagram of the speaker module 1 provided in this application installed on the carrier 20 in some other embodiments.

[0147] In some embodiments, the frame 11 may have a second groove 116, the vent 111 may be disposed on the inner wall of the second groove 116, and the speaker 12 is disposed opposite to the side wall of the second groove 116.

[0148] In this embodiment, by providing the second groove 116, the second diaphragm 14 can be located within the frame 11 structure, so that when the speaker module 1 is installed to other structures, there is no need to further consider the installation space and vibration space of the second diaphragm 14, which is beneficial to improving the installation efficiency of the speaker module 1.

[0149] For example, the second vibration plate 14 can be disposed on the side wall of the second groove 116, and the second vibration plate 14 can be disposed opposite to the first vibration plate 13.

[0150] It should be noted that relative arrangement means that at least part of the first vibrating plate 13 and the second vibrating plate 14 are directly opposite each other, and does not limit the center line of the first vibrating plate 13 and the center line of the second vibrating plate 14 to coincide. It can be understood that when the first vibrating plate 13 and the second vibrating plate 14 are completely directly opposite each other, their center lines can coincide.

[0151] In this embodiment, by designing the first vibration plate 13 and the second vibration plate 14 to be arranged oppositely, it is beneficial that when the speaker module 1 is working, the first vibration plate 13 and the second vibration plate 14 generate vibrations in opposite directions, thereby canceling out the overall vibration of the speaker module 1, thus reducing the vibration of the speaker module 1 during operation and improving the sound quality experience.

[0152] The number of vents 111 can be two, and both vents 111 are located on the side wall of the second groove 116. The two vents 111 can be arranged in the same direction as the speaker 12. The number of second diaphragms 14 can be two, and the two second diaphragms 14 can correspond one-to-one with the two vents 111.

[0153] It should be noted that the arrangement of the two vents 111 and the speaker 12 in the same direction means that in that direction, the two vents 111 and the speaker 12 at least partially overlap, but it does not mean that they completely overlap.

[0154] In this embodiment, the speaker 12 is positioned opposite to the second vibrating plate 14 installed at the vent 111. This design facilitates the vibration of the second vibrating plate 14 after the speaker 12 operates, thereby enabling the second vibrating plate 14 to drive the vibration of the first vibrating plate 13, thus achieving sound energy recovery. Furthermore, the first vibrating plate 13, the two second vibrating plates 14, and the speaker 12 are arranged in the same direction, which helps to cancel out the overall vibration of the speaker module 1 when it is operating, thereby improving the user experience.

[0155] The ratio of the natural vibration frequencies of the two second diaphragm plates 14 is in the range of 1 / 2 to 2, so as to take into account the engineering fluctuation tolerance and avoid excessive performance degradation, avoid the sensitivity fluctuation of the speaker module 1, and avoid the following: the two second diaphragm plates 14 are not synchronized near the resonance frequency point, which would cause the vibration of the two relatively set second diaphragm plates 14 to be unable to cancel each other, causing the speaker module 1 to vibrate.

[0156] For example, the ratio of the natural vibration frequencies of the two second vibrating plates 14 can be, but is not limited to, 1 / 2, or 2 / 3, or 1, or 3 / 2, or 2, or other values ​​between 1 / 2 and 2.

[0157] Please see Figure 9 , Figure 9 This is a schematic diagram of the speaker module 1 provided in this application installed on the carrier 20 in some other embodiments.

[0158] In some embodiments, there may be two first openings 112, which are arranged opposite to each other. There may also be two speakers 12, which correspond one-to-one with the two first openings 112, and the sound-emitting surfaces of the two speakers 12 face opposite directions.

[0159] In this embodiment, the above design enables the vibrations between the two speakers 12 to cancel each other out when the speaker module 1 is working, thereby reducing the overall vibration of the speaker module 1 and improving the user experience.

[0160] For example, the ratio of the natural resonant frequencies of the two speakers 12 is in the range of 1 / 2 to balance engineering tolerances and avoid excessive performance degradation, thus preventing the sensitivity and bandwidth of the speaker module 1 from being affected. b1 ~f b2 Fluctuations occur and can be avoided: the two speakers 12 are out of sync near the resonant frequency point, which causes the vibrations between the two speakers 12 that are set opposite each other to be unable to cancel each other out, causing the speaker module 1 to vibrate.

[0161] For example, the ratio of the natural vibration frequencies of the two loudspeakers 12 can be, but is not limited to, 1 / 2, or 2 / 3, or 1, or 3 / 2, or 2, or other values ​​between 1 / 2 and 2.

[0162] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other, and any combination of features from different embodiments is also within the scope of protection of this application. In other words, the multiple embodiments described above can be arbitrarily combined according to actual needs. It should also be noted that all the above figures are exemplary illustrations of this application and do not represent the actual size of the product. Furthermore, the dimensional proportions between components in the figures are not intended to limit the actual product of this application. The above are only some embodiments and implementation methods of this application, and the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A speaker module, characterized in that, include: The frame is provided with a first opening, a second opening, and a vent. A speaker is installed in the first opening and covers the first opening; A first vibrating plate is installed in the second opening and covers the second opening; the first vibrating plate is a passive vibrating plate. The second vibrating plate is installed on the frame and blocks the vent. The second vibrating plate is a passive vibrating plate. The speaker, the first vibrating plate, the second vibrating plate and the frame enclose a cavity. Wherein, the system resonant frequency f of the first vibrating plate b1 The system resonant frequency f with the second vibrating plate b2 Satisfy: f b1 <f b2 When the operating frequency f of the loudspeaker satisfies: f b1 <f<f b2 At that time, the first vibrating plate and the loudspeaker jointly output sound pressure, and the sound pressure is positively superimposed, wherein the system resonant frequency f of the first vibrating plate is... b1 The equivalent vibrational mass of the first vibrating plate and the equivalent compliance of the second vibrating plate are inversely proportional, and the system resonant frequency f of the second vibrating plate is... b2 The equivalent vibration mass and equivalent compliance of the second vibrating plate are inversely proportional to each other. Wherein, the natural resonant frequency f0_p1 of the first vibrating plate and the natural resonant frequency f0_p2 of the second vibrating plate satisfy: f0_p1 < f0_p2.

2. The speaker module as described in claim 1, characterized in that, The natural resonant frequency f0_p1 of the first vibrating plate, the natural resonant frequency f0_p2 of the second vibrating plate, and the natural resonant frequency f0_s of the loudspeaker satisfy the following: f0_p1<f0_s<f0_p2.

3. The speaker module as described in claim 1 or 2, characterized in that, The equivalent vibration mass M of the first vibrating plate ms The equivalent vibration mass M of _p1 and the second vibrating plate ms _p2 satisfies: M ms _p1>M ms _p2。 4. The speaker module as described in any one of claims 1 to 3, characterized in that, The chamber is a closed space.

5. The speaker module as described in any one of claims 1 to 4, characterized in that, There are multiple second openings and multiple first vibration plates, with each of the multiple first vibration plates corresponding to one of the multiple first openings.

6. The speaker module as described in claim 5, characterized in that, At least two of the plurality of first vibrating plates are arranged opposite each other.

7. The speaker module as described in claim 5 or 6, characterized in that, The ratio of the natural resonant frequencies of any two of the plurality of first vibrating plates is in the range of 1 / 2 to 2.

8. The speaker module as described in any one of claims 1 to 4, characterized in that, The first vibrating plate and the second vibrating plate are arranged opposite to each other.

9. The speaker module as described in claim 8, characterized in that, The frame has a first groove located between the second opening and the vent. The first opening is located on the side wall of the first groove, and the sound output surface of the speaker faces the first vibrating plate.

10. The speaker module as described in any one of claims 1 to 4, characterized in that, The frame has a second groove, and the vent is disposed on the inner wall of the second groove; The speaker is positioned opposite the sidewall of the second groove.

11. The speaker module as described in claim 10, characterized in that, The second vibrating plate is disposed on the side wall of the second groove, and the second vibrating plate is disposed opposite to the first vibrating plate.

12. The speaker module as described in claim 10 or 11, characterized in that, The number of vents is two, and both vents are located on the side wall of the second groove. The two vents are arranged in the same direction as the speaker. There are two second vibrating plates, and each of the two second vibrating plates corresponds to one of the two air vents.

13. The speaker module as described in any one of claims 1 to 4, characterized in that, The number of the first openings is two, and the two first openings are arranged opposite to each other; The number of loudspeakers is two, and the two loudspeakers correspond one-to-one with the two first openings, with the sound-emitting surfaces of the two loudspeakers facing opposite directions.

14. The speaker module as described in any one of claims 1 to 13, characterized in that, The speaker module also includes a pipe, which is installed in the frame and communicates with the vent.

15. A sound system, characterized in that, The device includes a baffle and a speaker module according to any one of claims 1 to 14, the baffle having a through hole, the speaker module being mounted on the baffle, and the vent communicating with the through hole.

16. A means of transportation, characterized in that, The vehicle includes a carrier and a speaker module as described in any one of claims 1 to 14, the speaker module being installed inside the carrier and the vent communicating with the outside of the carrier; Alternatively, the vehicle may include a vehicle and the audio system as described in claim 15, the baffle being mounted on the vehicle and the through-hole communicating with the exterior of the vehicle.

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