Loudspeaker module and vehicle

Abstract

The present application provides a loudspeaker module (10) and a vehicle. The loudspeaker module (10) comprises a loudspeaker unit (300) and a frame body (200); the loudspeaker unit (300) is arranged in the frame body (200), and is fixedly connected to the frame body (200) by means of a first mounting surface (310); the loudspeaker unit (300) comprises a diaphragm (302), the diaphragm (302) is enclosed in the loudspeaker unit (300), a first cavity (240) is defined by the side of the diaphragm (302) close to the first mounting surface (310) and the frame body (200), and the included angle between the sound emission direction of the first cavity (240) and a plane where the first mounting surface (310) is located ranges from -30° to 30°; the periphery of the frame body (200) comprises a second mounting surface (211) for fixedly connecting the loudspeaker module (10) to a preset mounting position, the main plane of the second mounting surface (211) is parallel to the main plane of the preset mounting position, and the included angle range between the axial direction of the loudspeaker unit (300) and the main plane of the second mounting surface (211) ranges from -30° to 30°. According to the loudspeaker module (10) and the vehicle provided in embodiments of the present application, vibration generated at and near the mounting position of the loudspeaker module (10) when the loudspeaker module (10) is working can be effectively reduced, improving the sound quality of the loudspeaker module (10).

Description

Speaker modules and vehicles

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on August 17, 2023, with application number 202311043580.8 and invention name “Speaker Module and Vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of loudspeakers, and in particular, to a loudspeaker module and a vehicle. Background Art

[0003] A loudspeaker is an electroacoustic transducer that converts electrical energy into sound energy and radiates it through the air to a distant location. A dynamic loudspeaker generally consists of a support system, a magnetic circuit system, and a vibration system. The magnetic circuit and vibration system are the primary components for converting electrical energy into sound energy. The magnetic circuit system generates a magnetic field when energized, exerting a force on the voice coil in the vibration system, causing it to vibrate. The voice coil, in turn, vibrates the diaphragm, which in turn vibrates the air, ultimately producing sound.

[0004] Due to the interaction of forces, when the magnetic circuit system generates an alternating force on the voice coil, causing the voice coil to vibrate and radiate sound waves, the magnetic circuit system will be subjected to a reaction force, causing the speaker unit body or electronic sound conversion components to vibrate, and then causing the mounting surface of the speaker module and other components to vibrate and emit abnormal noise, seriously affecting the sound quality of the speaker.

[0005] Summary of the Invention

[0006] The present application provides a speaker module and a vehicle, which can effectively reduce the vibration generated at and near the installation position of the speaker module when the speaker module is working, thereby improving the sound quality of the speaker module.

[0007] In a first aspect, a speaker module is provided, characterized in that it includes a speaker unit and a frame, the speaker unit is arranged in the frame, the speaker unit includes a first mounting surface, the first mounting surface is located at the end of the speaker unit with a larger radial dimension, and the speaker unit is fixedly connected to the frame through the first mounting surface; the speaker unit also includes a diaphragm, the diaphragm is surrounded in the speaker unit, and the side of the diaphragm close to the first mounting surface forms a first cavity with the frame, and the sound emission direction of the first cavity and the plane where the first mounting surface is located have an angle range of -30° to 30°; the outer periphery of the frame includes a second mounting surface, the second mounting surface is used to fix the speaker module to a preset mounting position, the main plane of the second mounting surface is parallel to the main plane of the preset mounting position, and the angle range between the axial direction of the speaker unit and the main plane of the second mounting surface is -30° to 30°.

[0008] In the embodiment provided in the present application, the angle range between the axial direction of the speaker unit and the second mounting surface is -30° to 30°, and the angle range between the sound output direction of the first cavity and the plane where the first mounting surface is located is -30° to 30°. This can reduce the sound wave energy transmitted in the direction perpendicular to the second mounting surface, thereby reducing the vibration generated at the mounting position and near the mounting position of the speaker module when the speaker module is working, reducing the noise generated by the vibration at the mounting position, and improving the sound quality of the speaker module.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the side of the diaphragm facing away from the first mounting surface and the frame form a second cavity, the second cavity and the first cavity are respectively arranged on both sides of the second mounting surface in a direction perpendicular to the main plane of the second mounting surface, and the frame includes an opening portion so that the second cavity is an open cavity, and the opening direction of the opening portion is perpendicular to the main plane of the second mounting surface.

[0010] In the embodiment provided in the present application, the side of the diaphragm facing away from the first mounting surface and the frame form a second cavity, and the second cavity is an open cavity. After the speaker module is installed at the mounting position, the open second cavity can form an infinite rear cavity with the accommodating space at the mounting position, thereby being able to dissipate the sound waves radiated by the speaker module toward the second cavity, thereby avoiding the sound waves radiated by the speaker module toward the second cavity from affecting the sound waves radiated toward the first cavity, and ensuring that the sound waves are radiated in the direction of the first cavity.

[0011] In combination with the first aspect, in certain implementations of the first aspect, a sealing surface is formed between the first mounting surface and the frame body to isolate the first cavity from the second cavity.

[0012] In the embodiment provided in the present application, the first mounting surface of the speaker unit is fixedly connected to the frame and forms a sealing surface to isolate the first cavity and the second cavity, thereby preventing the sound waves radiated by the speaker module toward the second cavity from affecting the sound waves radiated toward the first cavity, thereby ensuring the sound performance of the first cavity.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the ratio between the farthest distance from the frame portion corresponding to the first cavity to the main plane of the second mounting surface and the size of the speaker module in a direction perpendicular to the main plane of the second mounting surface is in the range of 1 / 4 to 3 / 4.

[0014] In the embodiment provided in the present application, the ratio of the farthest distance between the frame part corresponding to the first cavity and the main plane of the second mounting surface and the size of the speaker module in the direction perpendicular to the main plane of the second mounting surface is in the range of 1 / 4 to 3 / 4, which can ensure that when the speaker module is installed in the installation position, the ratio of the installation depth of the speaker module at the preset installation position and the size of the speaker module in the direction perpendicular to the main plane of the second mounting surface is in the range of 1 / 4 to 3 / 4, thereby reducing the torque between the speaker module and the preset installation position and reducing the vibration at the installation position when the speaker module is working.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the volume of the first cavity is greater than or equal to 0.1 liter.

[0016] In the embodiment provided in the present application, the volume of the first cavity is greater than or equal to 0.1 liter, which can make the acoustic cutoff frequency of the speaker module much greater than the resonant frequency of the speaker module, ensuring that the speaker module has a wider operating frequency band, thereby ensuring the acoustic performance of the speaker.

[0017] In combination with the first aspect, in some implementations of the first aspect, a ratio of an acoustic cutoff frequency of the speaker module to a resonant frequency of the speaker module is greater than or equal to 4.

[0018] In the embodiment provided in the present application, the volume design of the first cavity can make the ratio of the acoustic cutoff frequency of the speaker module to the resonant frequency of the speaker module greater than or equal to 4, thereby enabling the speaker module to have a wider operating frequency band, thereby ensuring the acoustic performance of the speaker module.

[0019] In combination with the first aspect, in some implementations of the first aspect, the speaker module further includes at least one first sub-cavity, and at least one first sub-cavity is connected to the first cavity.

[0020] In the embodiment provided in the present application, the speaker module includes at least one first sub-cavity, and at least one first sub-cavity is connected to the first cavity, which can reduce the resonance peak of the first cavity of the speaker module and expand the bandwidth, thereby improving the acoustic performance of the speaker module.

[0021] In combination with the first aspect, in certain implementations of the first aspect, a side of the second mounting surface close to the preset mounting position includes a shock-absorbing pad.

[0022] In the embodiment provided in the present application, the side of the second mounting surface close to the preset mounting position includes a shock-absorbing pad, which can reduce the sound wave energy transmitted in the direction perpendicular to the second mounting surface, thereby reducing the vibration generated at the mounting position and near the mounting position of the speaker module when the speaker module is working, avoiding noise generated by vibration at the mounting position and affecting the sound quality of the speaker module.

[0023] In combination with the first aspect, in certain implementations of the first aspect, the second mounting surface includes mounting holes, the number of the mounting holes is at least 3, and the mounting holes penetrate the second mounting surface in a direction perpendicular to the second mounting surface.

[0024] In the embodiment provided in the present application, the second mounting surface includes at least 3 mounting holes, and the mounting holes pass through the second mounting surface in a direction perpendicular to the second mounting surface, which can improve the stability of the connection between the speaker module and the preset mounting position.

[0025] In combination with the first aspect, in some implementations of the first aspect, there are multiple speaker units, the multiple speaker units form a symmetrical structure, and the first installation surfaces of the multiple speaker units are close to each other.

[0026] In the embodiment provided in the present application, multiple speaker units form a symmetrical structure and the first mounting surfaces of the multiple speaker units are close to each other, which can increase the sound pressure of the speaker module, improve the acoustic performance of the speaker module, and further reduce the vibration at the preset installation position.

[0027] In combination with the first aspect, in some implementations of the first aspect, there are multiple frames, and the number of the frames is the same as the number of the speaker units, and the multiple speaker units are respectively accommodated in corresponding frames.

[0028] In a second aspect, a vehicle is provided, comprising a speaker module as described in the first aspect or any possible implementation of the first aspect, the vehicle comprising a door, the preset installation position being located on the door, and the main plane of the preset installation position being parallel to the plane direction of the door.

[0029] In combination with the second aspect, in certain implementations of the second aspect, the vehicle further includes an outer wall, and the outer wall and the preset installation position form a storage space. When the speaker module is fixedly connected to the preset installation position, the frame portion corresponding to the first cavity is located in the storage space, the opening portion is connected to the storage space, and the second cavity and the storage space together form a closed cavity.

[0030] In combination with the second aspect, in certain implementations of the second aspect, a ratio of the volume of the second cavity to the volume of the closed cavity is less than or equal to 1 / 10.

[0031] In the embodiment provided in the present application, when the speaker module is installed at a preset installation position, the second cavity is connected to the accommodating space formed at the installation position through the opening part to form a closed cavity, which can dissipate the sound waves radiated by the speaker module toward the second cavity, avoid the sound waves radiated by the speaker module toward the second cavity from affecting the sound waves radiated toward the first cavity, and ensure that the sound waves are radiated in the direction of the first cavity; the ratio of the volume of the second cavity to the volume of the closed cavity is less than or equal to 1 / 10, which can further improve the sound performance of the first cavity of the speaker module. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram of a three-dimensional structure of a speaker module provided in an embodiment of the present application.

[0033] FIG2 is a schematic cross-sectional view of a speaker module according to an embodiment of the present application.

[0034] FIG3 is a schematic cross-sectional view of a speaker module according to an embodiment of the present application.

[0035] FIG4 is an acoustic effect diagram of a speaker module provided in an embodiment of the present application.

[0036] FIG5 is a schematic diagram of the installation structure of a speaker module provided in an embodiment of the present application.

[0037] FIG6 is a schematic diagram of the installation structure of a speaker module provided in an embodiment of the present application.

[0038] FIG7 is a comparison diagram of acceleration levels at the installation position of a speaker module provided in an embodiment of the present application.

[0039] FIG8 is a comparison diagram of acceleration levels at the installation position of a speaker module provided in an embodiment of the present application.

[0040] FIG9 is a schematic diagram of the installation structure of a speaker module provided in an embodiment of the present application.

[0041] FIG10 is an acoustic analog equivalent circuit diagram of a speaker module provided in an embodiment of the present application.

[0042] FIG11 is a schematic cross-sectional view of another speaker module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The technical solution in this application will be described below with reference to the accompanying drawings.

[0044] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0045] In the various embodiments of this application, the terms "first," "second," and so on are merely used to indicate that multiple objects are distinct. For example, "first cavity" and "second cavity" are merely used to indicate different cavities. These terms should not affect the cavities themselves or their number. The terms "first," "second," and so on should not limit the embodiments of this application in any way.

[0046] The terms "include", "comprising", "having" and variations thereof mean "including but not limited to", unless specifically emphasized otherwise.

[0047] In the examples of this application, unless otherwise specified, the number of nouns refers to "singular or plural nouns," i.e., "one or more." "At least one" means one or more, "a plurality" means two or more, and "many" in "one or more" also means two or more.

[0048] Figures 1 and 2 are schematic structural diagrams of a speaker module provided in an embodiment of the present application, wherein Figure 1 is a schematic three-dimensional structural diagram of a speaker module provided in an embodiment of the present application, (a) in Figure 1 is a schematic overall structural diagram of the speaker module, (b) in Figure 1 is a schematic diagram of the frame structure, and (c) in Figure 1 is a schematic structural diagram of the speaker unit; Figure 2 is a schematic cross-sectional structural diagram of the structure shown in Figure 1 along the AA section.

[0049] 1 and 2 , the speaker module 10 may include a speaker unit 300 and a frame 200 , and the speaker unit 300 may be disposed in the frame 200 .

[0050] The speaker unit 300 can have an overall approximately conical structure and can include structural components such as a frame 301, a magnetic circuit system 305, a voice coil 306, a diaphragm 302, a centering support 307, a folding ring 303, and a dust cover 304. The frame 301 is the primary supporting structure of the speaker unit 300. Components such as the magnetic circuit system 305, the voice coil 306, the diaphragm 302, the centering support 307, the folding ring 303, and the dust cover 304 can be housed within the frame 301. The frame 301 can have an approximately conical structure. The material of the frame 301 can generally be lightweight, non-deformable, and have good heat dissipation properties, such as metal.

[0051] The magnetic circuit system 305 can be composed of a magnet, a soft magnetic material pole piece and a yoke. The voice coil 306, the diaphragm 302 and the centering support 307 are the main components of the vibration system. The voice coil 306 can be formed by winding a wire on a pipe and placed in the magnetic gap of the magnetic circuit system 305. The diaphragm 302 can be arranged around the inner periphery of the speaker unit 300, or in other words, the diaphragm 302 can be arranged around the inner periphery of the basin frame 301, and one end of the diaphragm 302 can be connected to the voice coil 306, and the other end can be connected to the folding ring 303. For example, the diaphragm 302 can be conical, and the end with the smaller radial dimension of the conical diaphragm 302 can be connected to the voice coil 306, and the end with the larger dimension can be connected to the folding ring 303. The diaphragm 302 can also have a planar or arc-shaped structure. The material of the diaphragm 302 can be fiber, rubber, elastomer, metal, etc. When the speaker unit 300 is powered, the magnetic circuit system 305 generates a magnetic field, exerting a force on the voice coil 306 and causing it to vibrate. This vibration, in turn, drives the diaphragm 302 to vibrate, which in turn pushes air to vibrate, thereby producing sound. A dust cover 304 can be installed on the end of the voice coil 306 away from the magnetic circuit system 305 to prevent dust from entering the voice coil 306 and causing vibrations therein to generate noise.

[0052] The centering support 307 can be disposed between the voice coil 306 and the paper cone. The centering support 307 can be used to ensure that the voice coil 306 moves in the magnetic gap along the axial direction of the speaker unit 300 without moving in the lateral direction. The axial direction of the speaker unit 300 is the direction of the y-axis shown in the figure, and the axial direction of the speaker unit 300 can also be referred to as the normal direction of the diaphragm 302. The centering support 307 can be made of cotton fabric, fiber material, or other materials. The folding ring 303 can be annular and can be disposed circumferentially at the radially larger end of the speaker unit 300. The folding ring 303 can also be used to ensure that the diaphragm 302 moves in the axial direction of the speaker without moving in the lateral direction. The folding ring 303 can be made of plastic, natural rubber, paper, or other materials and is bonded to the diaphragm 302 by heat pressing. The centering support 307 and the folding ring 303 work together to ensure that the diaphragm 302 and the voice coil 306 move in the axial direction within a certain range.

[0053] The speaker unit 300 can be disposed within the frame 200 and can include a first mounting surface 310. The first mounting surface 310 can be disposed at the end of the speaker unit 300 with the larger radial dimension, and the first mounting surface 310 can be a planar structure, that is, the first mounting surface 310 can be parallel to the xz plane shown in the figure. Since the diaphragm 302 is enclosed within the speaker unit 300, the first mounting surface 310 can be located in front of the diaphragm 302, that is, along the positive direction of the y-axis. The first mounting surface 310 can be located closer to the origin on the y-axis relative to the diaphragm 302. The first mounting surface 310 can be used to be fixedly connected to the frame 200, for example, by screwing, gluing, etc. Exemplarily, the first mounting surface 310 of the speaker unit 300 may include one or more through holes 308, such as the four through holes 308 shown in the figure, and the frame 200 may include one or more through holes 221 at positions corresponding to the through holes 308. Screws may then be passed through the through holes 308 and the through holes 221 in sequence to securely connect the frame 200 to the speaker unit 300. Through holes may also be provided in the middle and rear portions of the speaker unit 300, such as a through hole 309 may be provided in the middle of the speaker unit 300. Correspondingly, through holes (not shown) may also be provided at corresponding positions within the frame 200 to provide a more stable connection between the speaker unit 300 and the frame 200.

[0054] The frame 200 may include a side wall 210, a top wall 220 and a bottom wall 230, wherein the side wall 210 may be annular and arranged around the periphery of the speaker unit 300, and a portion of the side wall 210 may be located on the front side of the speaker unit 300, and a portion may be located on the rear side of the speaker unit 300.

[0055] The outer periphery of the frame 200 may include a second mounting surface 211, which can be used to fix the speaker module 10 to a preset mounting position. The second mounting surface 211 can be provided on the outer periphery of the side wall 210 of the frame 200. The main plane of the second mounting surface 211 can be perpendicular to the main plane of the side wall 210. The main plane of the second mounting surface 211 is also the larger surface of the second mounting surface. The main plane of the second mounting surface 211 of the speaker module 10 shown in Figures 1 and 2 can be the xy plane shown in the figure. When the speaker module 10 is fixedly connected to the preset mounting position, the second mounting surface 211 can be parallel to the fixed connection position to make the connection between the second mounting surface 211 and the preset mounting position more stable. The second mounting surface 211 may include mounting holes 2111. The number of the mounting holes 2111 may be at least three and may be evenly distributed on the second mounting surface 211. The mounting holes 2111 may penetrate the second mounting surface 211 in a direction perpendicular to the main plane of the second mounting surface 211, so that the second mounting surface 211 can be fixedly connected to the predetermined mounting position of the speaker module 10 by screwing. The predetermined mounting position of the speaker module 10 may be an unlimited baffle in the vehicle cabin, for example, a door panel, an interior trim panel, a floor, or a ceiling.

[0056] It should be noted that in the embodiments of the present application, when two structural members are parallel to each other, it can mean that the two structural members are approximately parallel rather than absolutely parallel. Those skilled in the art will understand that due to errors caused by product production, the two structural members can be parallel to each other with a certain inclination angle. For example, when the angle between the two structural members is less than or equal to 10°, the two structural members can be considered parallel to each other. Similarly, when two structural members are perpendicular to each other, it can mean approximately perpendicular.

[0057] The bottom wall 230 can extend from the first mounting surface 310 of the speaker unit 300 toward the front of the speaker unit, that is, extend from the first mounting surface 310 of the speaker unit 300 in the negative direction of the y-axis, and be fixedly connected to the side wall 210. The bottom wall 230 can be fixedly connected to the inner periphery of the side wall 210, or it can be fixedly connected to the bottom end of the side wall 210.

[0058] The bottom wall 230 may have a wedge-shaped, square-shaped, arc-shaped, flat-shaped, or irregular-shaped shape, which is not limited in this application.

[0059] The side of the diaphragm 302 of the speaker unit 300 near the first mounting surface 310 can form a first cavity 240 with the frame 200. The first cavity 240 is the space enclosed by the side of the diaphragm 302 near the first mounting surface 310, the bottom wall 230, and the sidewalls 210. The first cavity 240 can also be referred to as the front cavity of the speaker module 10, and the side of the diaphragm 302 near the first mounting surface 310 of the speaker unit 300 can also be referred to as the front portion of the diaphragm 302 of the speaker unit 300.

[0060] The side of the frame 200 near the first mounting surface 310 of the speaker unit 300 may include an open surface 241, or in other words, the portion of the frame 200 located in front of the speaker unit 300 may include an open surface. This open surface 241 may also be referred to as a first open surface or a sound outlet of the speaker module. The open surface may refer to a side of the frame 200 near the first mounting surface 310 of the speaker unit 300 that is not completely closed, so that the sound generated by the speaker unit 300 can be transmitted to the outside of the frame 200 through the first open surface 241. For example, in the illustrated speaker module, there is a certain gap between the front of the speaker unit 300 and the side wall 210, and the top wall 220 is not connected to the side wall 210, so that the upper end of the side wall 210 forms the first open surface 241. When the plane on which the upper end of the side wall 210 lies is parallel to the main plane of the second mounting surface 211, the first open surface 241 may also be parallel to the main plane of the second mounting surface 211. The frame 200 forms a first open surface, that is, the first cavity 240 is an open cavity, and the sound waves generated by the vibration of the diaphragm 302 of the speaker unit 300 can be radiated outward through the first open surface 241.

[0061] The volume of the first cavity 240 may be greater than or equal to 0.1 liter (L). For example, the volume of the first cavity 240 may be 0.1 L, 0.15 L, 0.2 L, 0.25 L, 0.3 L, 0.35 L or 0.4 L.

[0062] The volume of the first cavity 240 can be set so that the ratio of the acoustic cutoff frequency of the speaker module 10 to the resonant frequency of the speaker module 10 is greater than or equal to 4. For example, the acoustic cutoff frequency of the speaker module 10 can be 4 times, 4.5 times, 5.5 times, etc., of the resonant frequency of the speaker module 10, thereby enabling the speaker module to have a wider operating frequency band and ensuring the acoustic performance of the speaker module 10. The acoustic cutoff frequency may refer to the frequency at which a system begins to not pass signals.

[0063] Before the acoustic cutoff frequency, the structure of the first cavity 240 does not affect the output of sound waves. When the operating frequency of the speaker module 10 is greater than the cutoff frequency, the electroacoustic conversion efficiency of the speaker module 10 will gradually decrease. Therefore, through the structural design of the first cavity 240, such as setting a larger volume of the first cavity 240, the acoustic cutoff frequency of the speaker module 10 can be higher than the upper limit of the operating frequency, so that the speaker module has a wider operating frequency band and ensures a higher electroacoustic conversion efficiency, thereby ensuring the acoustic performance of the speaker module 10.

[0064] The top wall 220 may be disposed above the second mounting surface 211, and at least a portion of the top wall 220 may be fixedly connected to the side wall 210. The "above" of the second mounting surface 211 may refer to the portion above the second mounting surface 211 in the z-axis direction shown in the figure. The top wall 220 may extend rearward from the first mounting surface 310 of the speaker unit 300 to the rear end of the speaker unit 300 and connect to the side wall 210 located at the rear end of the speaker unit 300. The portion of the top wall 220 connected to the side wall 210 may connect to the inner circumference of the side wall 210, or may connect to the top end of the side wall 210. When the overall speaker unit 300 is approximately conical in structure, the rear end of the speaker unit 300 is the end with the smallest radial dimension of the speaker unit 300. The top wall 220 may also continue to extend forward from the first mounting surface 310 , that is, continue to extend in the negative direction of the y-axis shown in FIG. 1 , as long as the top wall 220 is not completely connected to the side wall 210 at the front end of the first mounting surface 310 to form a first open surface 241 .

[0065] Some of the through holes 221 can be arranged at a position near the first mounting surface 310 of the top wall 220, for example, they can be arranged on the left and right sides of the top wall 220, and fixedly connected to the two through holes 308 on the upper side of the first mounting surface 310, so that the frame 200 can be fixedly connected to the speaker unit 300. The shape of the portion of the top wall 220 near the first mounting surface 310 of the speaker unit 300 can be the same as the shape of the first mounting surface 310, so that the top wall 220 can fit the outer periphery of the first mounting surface 310 to form a sealing surface. The shape of the top wall 220 can be similar to that of the speaker unit 300, forming a wedge surface at the top to reduce the volume of the speaker module 10, so that when the speaker module 10 is fixedly connected to the preset mounting position, it can avoid other components in the installation scene. The top wall 330 can also be square, arc-shaped, flat or irregular in shape, etc., which is not limited in this application.

[0066] The side of the diaphragm 302 of the speaker unit 300 facing away from the first mounting surface 310 can form a second cavity 250 with the frame 200. This is the space enclosed by the side of the diaphragm 302 facing away from the first mounting surface 310, the sidewalls 210, and the top wall 220. The second cavity 250 can also be referred to as the rear cavity of the speaker module 10, and the side of the diaphragm 302 facing away from the first mounting surface 310 can also be referred to as the rear portion of the diaphragm 302. Since the tail of the speaker unit 300 has a smaller radial dimension than the head, there can be a certain gap between the tail of the speaker unit 300 and the side wall 210, or in other words, a second open surface 251 can be formed between the tail of the speaker unit 300 and the side wall 210. The second open surface 251 can also be called an opening portion 251. The opening portion 251 can make the second cavity 250 an open cavity, and the opening direction of the opening portion 251 can be perpendicular to the main plane of the second mounting surface 211. Thus, the speaker module 10 can radiate sound waves outward along the opening direction, that is, it can propagate sound wave energy outward along the negative direction of the z-axis shown in the figure.

[0067] The bottom wall 230 of the speaker module 10 can also continue to extend toward the rear of the speaker unit 300 from the position where it is connected to the first mounting surface 310 of the speaker unit 300, that is, continue to extend along the positive direction of the y-axis shown in the figure. It is only necessary to ensure that at least part of the bottom wall 230 is not connected to the side wall 210 located at the rear of the speaker unit 300, so that an opening part 251 is formed at the rear of the speaker unit 300.

[0068] The bottom wall 230 of the frame 200 can be disposed below the second mounting surface 211. The bottom of the second mounting surface 211 is, in other words, below the second mounting surface 211 in the z-axis direction shown in the figure. Some of the through holes 221 can also be disposed on the bottom wall 230 near the first mounting surface 310 of the speaker unit 300. For example, they can be disposed on the left and right sides of the bottom wall 230, respectively fixedly connected to the two through holes 308 on the lower side of the first mounting surface 310, thereby fixedly connecting the frame 200 to the speaker unit 300. The connection between the bottom wall 230 and the first mounting surface 310 can form a sealing surface. For example, the shape of the portion of the bottom wall 230 near the first mounting surface 310 of the speaker unit 300 can be the same as the shape of the first mounting surface 310, so that the outer periphery of the first mounting surface 310 of the speaker unit 300 can respectively fit with the top wall 220 and the side wall 210 of the frame 200, thereby forming a sealing surface at the connection between the speaker unit 300 and the frame 200. Furthermore, the inner diameter of the side wall 210 can also be the same as the radial dimension of the speaker unit 300, so that a sealing surface is formed at the connection position between the entire frame 200 and the first mounting surface 310. The sealing surface formed at the connection position between the frame 200 and the speaker unit 300 can isolate the front and rear cavities of the speaker unit 300, prevent the front and rear sound waves from canceling each other, and improve the radiation efficiency of the sound waves toward the first cavity 240.

[0069] The top wall 220 , the side wall 210 and the bottom wall 230 may be an integral structure formed in one piece, or may be multiple parts fixedly connected by welding or other methods.

[0070] It should be noted that the "same" size in the embodiments of the present application does not mean absolute sameness. Those skilled in the art can understand that since those skilled in the art can appropriately adjust the size of the structural parts according to design requirements, the "same" size of two structural parts allows deviations within a certain range, such as a difference of 0.1mm-0.5mm.

[0071] In some embodiments, the speaker module 10 may further include a first sub-cavity 231, which may be disposed on the periphery of the frame 200 and may be in communication with the first cavity 240. The first sub-cavity 231 may also be referred to as a side-branch cavity. For example, referring to the structure shown in FIG3 , the structure shown in FIG3 may be a cross-sectional structure of the speaker module 10 along the yz plane. The side-branch cavity 231 may be disposed on the periphery of the bottom wall 230, and a through hole 232 may be provided on the bottom wall 230 to enable the side-branch cavity 231 to communicate with the first cavity 240. The number of the side-branch cavities 231 may be multiple, and the multiple side-branch cavities 231 may be disposed at different positions of the bottom wall 230, and the multiple side-branch cavities 231 may be in communication with the first cavity 240. The multiple side-branch cavities 231 may have different resonant frequencies.

[0072] The first sub-cavity 231 can also be arranged in the frame 200 (not shown in the figure). For example, the first sub-cavity 231 can be arranged at a position of the speaker unit 300 away from the first mounting surface 310 and below the top wall 220. The position of the frame 200 connected to the first mounting surface 310 of the speaker unit 300 may include an opening so that the first sub-cavity 231 is connected to the first cavity 240.

[0073] Figure 4 shows the acoustic effects of an embodiment of the present application with and without a side branch cavity 231, where the horizontal axis represents the sound wave frequency (in Hz) and the vertical axis represents the acoustic transfer function amplitude (in dB). The provision of a side branch cavity can suppress the resonance peak of the first cavity 240 of the speaker module 10 and expand the bandwidth, thereby ensuring the acoustic performance of the speaker module 10.

[0074] In some embodiments, the second mounting surface 211 may further include a shock-absorbing pad 2113 on a side near the preset mounting position. The shock-absorbing pad 2113 may be made of, for example, rubber, plastic, or a composite material. The location of the shock-absorbing pad 2113 can be seen in the structure shown in FIG5 , which uses the door inner sheet metal 41 as an example of the preset mounting position.

[0075] As an example, as shown in (a) of FIG5 , the shock-absorbing pad 2113 can be disposed between the second mounting surface 211 and the preset mounting position, for example, between the second mounting surface 211 and the inner sheet metal of the vehicle door, to reduce the transmission of the sound wave energy generated by the speaker module 10 in the normal direction of the preset mounting position, reduce the vibration of the preset mounting position in the normal direction, and thereby reduce noise. The shock-absorbing pad 2113 can be annular, and the shape of the annular shock-absorbing pad 2113 can be the same as the shape of the second mounting surface 211, and be disposed on the lower side of the entire second mounting surface 211. The shock-absorbing pad 2113 can be parallel to the main plane of the second mounting surface 211, and the position of the shock-absorbing pad 2113 corresponding to the mounting hole 2111 has an opening (not shown in the figure) corresponding to the position so that a screw can pass through the mounting hole 2111 and the opening to be screwed to the preset mounting position.

[0076] As another example, as shown in FIG5( b ), the main plane of the shock-absorbing pad 2113 can be perpendicular to the main plane of the second mounting surface 211, that is, can be perpendicular to the inner door sheet metal 41. The shock-absorbing pad 2113 can also be annular, and the main plane of the shock-absorbing pad 2113 can be aligned with the side wall 210 of the speaker module 10. When the speaker module 10 is fixedly connected to the inner door sheet metal 41, the shock-absorbing pad 2113 can be located between the inner door sheet metal 41 and the side wall 210 of the speaker module 10.

[0077] The speaker module 10 may include one shock-absorbing pad 2113 or multiple shock-absorbing pads 2113. For example, the shock-absorbing pad 2113 may be set at the position shown in (a) in Figure 5, or at the position shown in (b) in Figure 5.

[0078] The second mounting surface 211 may further include a support member 2112. The support member 2112 may be disposed on a side of the second mounting surface 211 facing away from the predetermined mounting position, for example, on the upper side of the second mounting surface 211 in the z-axis direction as shown. The support member 2112 may be perpendicular to the main plane of the second mounting surface 211 and fixedly connected to the side wall. The support member 2112 may be disposed on the entire second mounting surface 211. The support member 2112 may further stabilize the connection between the second mounting surface 211 and the side wall, thereby further stabilizing the connection between the speaker module 10 and the predetermined mounting position.

[0079] In some embodiments, the angle range between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 can be -30° to 30°, and the angle range between the sound output direction of the first cavity 240 and the plane where the first mounting surface 310 is located can be -30° to 30°.

[0080] Referring to the schematic diagram of the installation of the speaker module at the preset installation position shown in FIG6 , for example, the speaker unit 300 can be installed at a position close to the cabin of the vehicle, for example, it can be installed on the vehicle door, that is, the preset installation position can be located on the vehicle door, and the preset installation position can be located on the inner door sheet metal 41. The preset installation position can be a partial area on the inner door sheet metal 41, for example, it can be a portion that is in direct contact with the second installation surface 211 of the speaker module. The inner door sheet metal 41 can include a mounting hole, and the speaker module 10 can be embedded in the mounting hole and installed on the inner door sheet metal 41 through the mounting hole. When the speaker module is fixedly connected to the preset installation position, the main plane of the second installation surface 211 of the speaker module can be parallel to the main plane of the preset installation position, and the main plane of the preset installation position can be parallel to the door plane. The door plane may refer to the plane where the door inner sheet metal 41 is located. In actual products, the door inner sheet metal 41 may be an irregular shape, for example, it may include protruding parts and recessed parts. The plane where the door inner sheet metal 41 is located may refer to a surface with a larger plane area on the door inner sheet metal 41, and the speaker module may be installed on the plane part of the door inner sheet metal 41 to make the connection between the speaker module and the door inner sheet metal more stable.

[0081] The vehicle door may further include an outer wall, which may be a vehicle door outer sheet metal 43. A sheet metal inner space 42 may be formed between the vehicle door inner sheet metal 41 and the vehicle door outer sheet metal 43. The sheet metal inner space 42 may be a hollow structure having a certain volume, and at least a portion of the speaker module 10 may be accommodated in the accommodation space. The opening portion 251 of the speaker module 10 may face the sheet metal inner space 42. When the speaker module 10 is fixedly connected to the preset installation position, the speaker module 10 may form a closed space with the accommodation space of the preset installation position. The speaker module 10 may radiate sound waves toward the sheet metal inner space 42 to dissipate the sound waves propagating toward the second cavity 250, thereby ensuring that the sound waves propagate toward the first cavity 240.

[0082] The angle between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 may be α. In the installation structure diagram shown in (a) of FIG6 , the angle α between the axial direction of the speaker unit 300 and the second mounting surface 211 is 0°, and the axial direction of the speaker unit 300 is parallel to the main plane of the second mounting surface 211. The speaker module 10 in this installation structure diagram may be the speaker module 10 shown in FIG1 and FIG2 . The speaker unit 300 may also be tilted in the frame 200, that is, α may not be 0°. When α is a negative value, the opening direction of the speaker unit 300 may be toward the inside of the space enclosed by the frame 200, that is, toward the direction of the storage space outside the cabin, as shown in (b) of FIG6 . When α is a positive value, the opening direction of the speaker unit 300 may be toward the outside of the space enclosed by the frame 200, that is, away from the direction of the storage space outside the cabin, as shown in (c) of FIG6 . The speaker unit 300 can be fixedly connected to the frame 200 in a structural relationship in which the angle between the axial direction and the second mounting surface 211 is in the range of -30° to 30°, or can be rotatably connected to the frame 200 so that the angle between the axial direction of the speaker unit 300 and the second mounting surface 211 can be adjusted within the range of -30° to 30°, for example, the tail of the speaker unit 300 can be rotatably connected to the frame 200.

[0083] The angle β between the sound emission direction of the speaker module 10 or the sound emission direction of the first cavity 240 and the plane where the first mounting surface 310 of the speaker unit 300 is located can be -30° to 30°. The first mounting surface 310 of the speaker unit 300 can be an annular structure, and the plane where the first mounting surface 310 is located is also the plane where the annular structure is located. For the speaker module 10 shown in Figures 1 to 3, the plane where the first mounting surface 310 is located can be parallel to the xz plane. The sound emission direction of the speaker module 10 can be the main sound emission direction of the speaker module, or the direction in which the sound wave energy radiated by the speaker unit 300 is the largest. For the structures shown in Figures 1 to 3, the sound emission direction of the speaker module 10 can be perpendicular to the main plane of the second mounting surface 211, or the sound emission direction of the speaker module 10 can be perpendicular to the plane direction surrounded by the upper end of the side wall 210, that is, perpendicular to the plane where the open surface 241 is located, see the arrow direction shown in Figure 2 or Figure 3. Specifically, when the speaker module 10 is installed according to the structure shown in (a) in Figure 6, the sound waves generated by the speaker unit 300 can first propagate along the axial direction of the speaker unit 300. After encountering the frame 200, for example, when encountering the bottom wall 220, the sound direction changes and propagates out of the frame 200. The sound direction of the speaker module 10 or the sound direction of the first cavity 240 can be the final sound direction after the direction is changed after encountering the frame 200. In the structure shown in (a) in Figure 6, the angle between the sound direction of the speaker module 10 and the plane where the first mounting surface 310 is located can be 0°. Similarly, when the speaker module 10 is installed according to the structure shown in (b) of Figure 6, the angle between the sound emission direction of the speaker module 10 and the plane where the first mounting surface 310 is located can be a negative value, for example, -30°; when the speaker module 10 is installed according to the structure shown in (c) of Figure 6, the angle between the sound emission direction of the speaker module 10 and the plane where the first mounting surface 310 is located can be a positive value, for example, 30°.

[0084] When the speaker unit 300's opening is oriented directly toward the interior of the cabin, that is, the speaker unit 300's axial direction is perpendicular to the second mounting surface 211, and the sound emission direction is perpendicular to the plane of the first mounting surface 310, as shown in FIG6(d), the sound wave energy generated by the speaker unit 300 can propagate directly into the cabin along the z-axis shown in FIG6, as indicated by the solid arrow in FIG6(d). The tangential stiffness of the second mounting surface 211 is much greater than the normal stiffness, meaning that the stiffness of the door inner sheet metal 41 along the y-axis is much greater than the stiffness along the z-axis. The smaller the stiffness, the more susceptible it is to force and vibration. When the sound wave energy propagates along the z-axis, the force acting on the door inner sheet metal is also directed in the z-axis direction, as indicated by the dashed arrow in the figure. This can easily cause the door inner sheet metal 41 to vibrate in the z-axis direction, generating abnormal sound and affecting the sound quality of the speaker module 10.

[0085] In the speaker module 10 provided in the embodiment of the present application, the angle range between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 is -30° to 30°, and the angle range between the sound output direction of the first cavity 240 and the plane where the first mounting surface 310 of the speaker unit 300 is located can be -30° to 30°, which can effectively reduce the sound wave energy transmitted along the normal direction of the second mounting surface 211, thereby effectively reducing the vibration of the sheet metal 41 inside the vehicle door and the position where the sheet metal 41 inside the vehicle door is connected in the normal direction of the second mounting surface 211, reducing the noise generated by the operation of the speaker module 10, and improving the sound quality of the speaker module 10.

[0086] For example, the angle between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 can be ±30°, ±25°, ±20°, ±15°, ±10°, ±5°, etc., and the angle between the sound output direction of the first cavity 240 and the plane where the first mounting surface 310 of the speaker unit 300 is located can be ±30°, ±25°, ±20°, ±15°, ±10°, ±5°, etc.

[0087] FIG7 is a comparison of acceleration effects at different installation angles provided by an embodiment of the present application. The greater the acceleration level, the more intense the vibration at the installation location. As shown in FIG7 , when the speaker unit 300 is installed in a forward orientation, that is, the angle between the axial direction of the speaker unit 300 and the second installation surface 211 is 90°, the average acceleration level at the installation location is 188 dB. When the angle between the axial direction of the speaker unit 300 and the second installation surface is 0°, the average acceleration level at the installation location is 155 dB. When the angle between the axial direction of the speaker unit 300 and the second installation surface 211 is ±5°, the average acceleration level at the installation location is 167 dB. When the angle between the axial direction of the speaker unit 300 and the second installation surface 211 is ±15°, the average acceleration level at the installation location is 176 dB. When the angle between the axial direction of the speaker unit 300 and the second installation surface 211 is ±30°, the average acceleration level at the installation location is 182 dB. When the angle between the axial direction of the speaker unit 300 and the second mounting surface 211 decreases from 90° to 30°, the acceleration level of the second mounting surface 211 has a significant gain, and as the angle between the axial direction of the speaker unit 300 and the second mounting surface 211 decreases, the acceleration level of the second mounting surface 211 continues to decrease, and the vibration of the mounting position gradually slows down.

[0088] In some embodiments, the ratio between the maximum distance from the frame portion corresponding to the first cavity 240 to the main plane of the second mounting surface 211 and the dimension of the speaker module 10 in a direction perpendicular to the main plane of the second mounting surface 211 is in the range of 1 / 4 to 3 / 4. When the speaker module 10 is fixedly connected to the preset mounting position, the frame portion corresponding to the first cavity 240 can be accommodated in the accommodation space 42 formed at the preset mounting position. The maximum distance from the frame portion corresponding to the first cavity 240 to the main plane of the second mounting surface 211 is also the accommodation depth of the speaker module 10 in the accommodation space at the preset mounting position, or is referred to as the installation depth of the second mounting surface. As shown in (a) to (c) of Figure 6, the preset mounting position can be the inner door sheet metal 41, and a certain accommodation space can be enclosed between the inner door sheet metal 41 and the outer door sheet metal 43. The outer door sheet metal 43 is also the outer wall of the vehicle. The maximum distance from the frame portion corresponding to the first cavity 240 to the main plane of the second mounting surface is h1 shown in the figure. The dimension of the speaker module 10 in a direction perpendicular to the principal plane of the second mounting surface 211 can be the sum of the distance from the end of the portion of the speaker module 10 located within the accommodation space, farthest from the principal plane of the second mounting surface 211, to the principal plane of the second mounting surface 211, and the distance from the end of the portion of the speaker module 10 located outside the accommodation space, farthest from the principal plane of the second mounting surface 211, to the principal plane of the second mounting surface 211, i.e., h2 in the figure. The dimension of the speaker module 10 in a direction perpendicular to the principal plane of the second mounting surface 211 can also be referred to as the height of the speaker module 10. The ratio of the installation depth of the speaker module 10 to the dimension of the speaker module 10 in a direction perpendicular to the principal plane of the second mounting surface 211 is in the range of 1 / 4 to 3 / 4, which can reduce the torque between the speaker module 10 and the installation location and reduce vibration at the installation location of the speaker module.

[0089] Figure 8 is a comparison diagram of the acceleration effects at the installation position at different installation depths provided by an embodiment of the present application. As shown in Figure 8, when the installation depth of the speaker module is 0, that is, when the speaker module is installed on the surface of the installation position and is not accommodated in the above-mentioned accommodation space, the average acceleration level at the installation position is 118.5dB; when the ratio of the installation depth to the height of the speaker module is 1 / 4, the average acceleration level at the installation position is 111.5dB; when the ratio of the installation depth to the height of the speaker module is 3 / 4, the average acceleration level at the installation position is 111.5dB; when the installation depth is 1 / 2, the average acceleration level at the installation position is 105.7dB. It can be seen that when the ratio of the installation depth to the height of the speaker module increases from 0 to 1 / 4, the average acceleration level at the installation position has a significant benefit, and the vibration at the installation position is significantly improved.

[0090] Continuing to refer to the installation structure diagram shown in Figure 6, the inner door sheet metal 41 can form a receiving space 42 with the outer door sheet metal 43. When the speaker module 10 is fixedly connected to the inner door sheet metal 41, the frame part corresponding to the first cavity 240 can pass through the installation hole on the inner door sheet metal 41 and be received in the receiving space. Moreover, when the speaker module is fixedly connected to the inner door sheet metal, the opening portion 251 of the speaker module can be connected to the accommodating space 42. Furthermore, since a sealing surface can be formed at the connection position between the second mounting surface 211 of the speaker module 10 and the inner door sheet metal 41, and a sealing surface can be formed at the connection position between the speaker unit 300 and the frame 200, the second cavity 250 of the speaker module 10 can form a closed cavity together with the accommodating space 42 through the opening portion 251. The closed cavity can be isolated from the first cavity 240, thereby losing the sound waves propagating from the speaker module 10 to the side where the second cavity 250 is located, so as to optimize the sound output effect on the first cavity 240 side.

[0091] The ratio between the volume of the second cavity 250 and the volume of the closed cavity can be less than or equal to 1 / 10. For example, the volume of the closed cavity can be 10 times, 15 times, 20 times, 25 times, etc., of the volume of the second cavity 250 to further enhance the bass effect of the first cavity 250.

[0092] FIG9 is a schematic diagram of another mounting structure provided in an embodiment of the present application, which may be a top view of the speaker module 10, that is, a schematic diagram of the overall structure of the speaker module 10 when viewed perpendicular to the plane of the vehicle door. When the speaker module 10 is mounted on the inner door sheet metal 41, the plane on which the first mounting surface 310 of the speaker unit 300 lies may be parallel to the lower contour of the inner door sheet metal 41, or in other words, parallel to the ground direction, that is, parallel to the x-axis direction shown in the figure, as shown by the angle relationship between the dotted line in FIG9 and the bottom of the inner door sheet metal 41. This allows the sound outlet of the speaker module 10 to be located in the upper half of the speaker module 10, or in other words, the first open surface 241 of the speaker module 10 to be located in the upper half of the speaker module 10, that is, in the portion of the speaker module 10 away from the ground, as shown in FIG9 (a). Alternatively, the sound outlet of the speaker module 10 may be located in the lower half of the speaker module 10 (not shown). The plane where the first mounting surface 310 of the speaker unit 300 is located can also be tilted to form a certain angle with the lower contour line of the inner door sheet metal 41. For example, the angle can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, etc., so that the sound outlet of the speaker module 10 is located on the right side of the speaker module, as shown in (b) of Figure 9, or the sound outlet of the speaker module 10 can also be located on the left side of the speaker module 10 (not shown in the figure). The plane where the first mounting surface 310 of the speaker unit 300 is located can also be perpendicular to the lower contour line of the inner door sheet metal 41, so that the sound outlet of the speaker module 10 is located on the right side of the speaker module, as shown in (c) of Figure 9, or the sound outlet of the speaker module 10 can also be located on the left side of the speaker module 10 (not shown in the figure).

[0093] It should be noted that the mounting structure shown in FIG9 is only an example of the installation of the speaker module 10 at the installation position, and the installation position of the speaker module 10 should not be limited. The speaker module 10 can be installed at the installation position at any angle, that is, the first mounting surface 310 and the bottom contour line of the door inner sheet metal 41 can form any angle, and the speaker module 10 can be set at any position on the door inner sheet metal 41, for example, it can be set at the bottom, top, left or right side of the door inner sheet metal 41.

[0094] The structure shown in Figure 9 can be a schematic diagram of the installation structure when the plane where the first mounting surface 310 is located is perpendicular to the second mounting surface 211, or a schematic diagram of the installation structure when the axial direction of the speaker unit 300 is parallel to the main plane of the second mounting surface 211. When the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 are in the angle relationship described above, the first mounting surface 310 and the bottom contour line of the sheet metal 41 inside the vehicle door can also have the above-mentioned angle relationship, and the sound outlet of the speaker module 10 can also be located on the upper side, lower side, left side or right side of the speaker module 10.

[0095] The circuit diagram shown in FIG10 is an acoustic analog equivalent circuit diagram of the speaker module 10 provided in an embodiment of the present application, wherein the power supply P is equivalent to the magnetic circuit system 305 in the speaker unit 300. The magnetic force generated by the magnetic circuit system 305 when energized can drive the vibration system to vibrate. The resistor Ras can be equivalent to the DC resistance of the voice coil 306 in the speaker unit 300. The capacitor Cas and the inductor Mas can be equivalent to the equivalent force compliance and mass of the vibration system of the speaker unit 300. The power supply P, the resistor Ras, the capacitor Cas, and the inductor Mas can collectively constitute the speaker unit 300. The capacitor Cab can be equivalent to the rear cavity of the speaker module 10. The lower half of the acoustic analog equivalent circuit diagram, including the capacitor Caf, the resistor Raf, and the inductor Maf, can be equivalent to the front cavity of the speaker module 10. The current direction shown in the figure can be the flow of the acoustic volume velocity. Both the front and rear cavities of the speaker module can have a certain acoustic volume velocity, and the vibration velocity in the front and rear cavities can be the same.

[0096] In some embodiments, the number of speaker units 300 can be multiple, and multiple speaker units 300 can form a symmetrical structure. For example, Figure 11 is a schematic cross-sectional structure diagram of another speaker module provided in an embodiment of the present application. As shown in Figure 11, the number of the speaker units 300 can be 2, and the 2 speaker units 300 can be relatively arranged to form an axisymmetric structure. Correspondingly, the number of frames 200 can also be multiple, and the number of frames 200 can be the same as the number of speaker units 300. For example, when the number of speaker units 300 is 2, the number of frames 200 can also be 2, so that multiple speaker units 300 can be respectively accommodated in corresponding frames 200. The 2 speaker units 300 and the corresponding frames 200 can be independent speaker modules, that is, forming 2 speaker modules, which are relatively arranged and fixedly connected to the preset installation positions respectively. Two speaker units 300 may also form a speaker module with the corresponding frame 200. That is, the two frames 200 may be fixedly connected, or may be an integral structure. For example, the two frames 200 may share a side wall to form a single frame 200. Providing multiple speaker units 300 in a symmetrical structure can further reduce vibration generated at the installation location, increase the sound pressure of the speaker module, and improve sound performance.

[0097] The speaker module provided in the embodiment of the present application may be a woofer speaker module, and the operating frequency of the speaker module may be less than 80 Hz.

[0098] The embodiment of the present application also provides a vehicle, which may include any one of the speaker modules 10 described in Figures 1 to 9. The speaker module 10 can be installed on a vehicle door, for example, on the above-mentioned inner door sheet metal. The speaker module can also be installed on the interior trim panel, floor, and ceiling of the vehicle. As described above, taking the installation location as the inner door sheet metal as an example, the inner door sheet metal can form a storage space with the outer door sheet metal. When the speaker module is fixedly connected to the inner door sheet metal, the frame portion corresponding to the first cavity can be accommodated in the storage space through the mounting hole. Moreover, when the speaker module is fixedly connected to the inner door sheet metal, the opening portion 251 of the speaker module can be connected to the storage space, so that the second cavity 250 can form a closed cavity with the storage space 42 through the second open surface 251. The closed cavity can be isolated from the first cavity 240, thereby dissipating the sound waves propagating from the speaker module to the side where the second cavity is located, so as to optimize the sound effect on the first cavity side. The ratio of the volume of the second cavity 250 to the volume of the closed cavity can be less than or equal to 1 / 10, so as to further enhance the bass effect of the first cavity 240 .

[0099] It should be noted that the speaker module can also be installed at other predetermined installation locations inside the vehicle, as long as the predetermined installation location can form a sealed space with the speaker module. Similarly, the speaker module can also be installed outside the vehicle, or at other locations that can form a sealed space with the speaker module, such as a wall or a sound box. This application does not limit the application scenario and predetermined installation location of the speaker module.

[0100] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A speaker module, characterized in that: The speaker unit comprises a speaker unit and a frame, wherein the speaker unit is arranged in the frame, the speaker unit comprises a first mounting surface, the first mounting surface is located at an end of the speaker unit with a larger radial dimension, and the speaker unit is fixedly connected to the frame through the first mounting surface; The speaker unit further includes a diaphragm, which is disposed inside the speaker unit, and a side of the diaphragm close to the first mounting surface and the frame form a first cavity, and an angle between a sound emission direction of the first cavity and a plane where the first mounting surface is located is in a range of -30° to 30°; The outer periphery of the frame includes a second mounting surface, which is used to fix the speaker module to a preset mounting position. The main plane of the second mounting surface is parallel to the main plane of the preset mounting position, and the angle between the axial direction of the speaker unit and the main plane of the second mounting surface ranges from -30° to 30°.

2. The speaker module according to claim 1, characterized in that: The side of the diaphragm facing away from the first mounting surface and the frame body form a second cavity, and the second cavity and the first cavity are respectively arranged on both sides of the second mounting surface along a direction perpendicular to the main plane of the second mounting surface, and the frame body includes an opening portion so that the second cavity is an open cavity, and the opening direction of the opening portion is perpendicular to the main plane of the second mounting surface.

3. The speaker module according to claim 2, characterized in that: A sealing surface is formed between the first mounting surface and the frame body to isolate the first cavity from the second cavity.

4. The loudspeaker module according to any one of claims 1 to 3, characterized in that: The ratio of the farthest distance from the frame portion corresponding to the first cavity to the main plane of the second installation surface to the size of the speaker module in a direction perpendicular to the main plane of the second installation surface is in a range of 1 / 4 to 3 / 4.

5. The loudspeaker module according to any one of claims 1 to 4, characterized in that: The volume of the first cavity is greater than or equal to 0.1 liter.

6. The speaker module according to claim 5, characterized in that: A ratio of an acoustic cutoff frequency of the speaker module to a resonant frequency of the speaker module is greater than or equal to 4.

7. The loudspeaker module according to any one of claims 1 to 6, characterized in that: The speaker module further includes at least one first sub-cavity, and the at least one first sub-cavity is connected to the first cavity.

8. The loudspeaker module according to any one of claims 1 to 7, characterized in that: A side of the second mounting surface close to the preset mounting position includes a shock absorbing pad.

9. The loudspeaker module according to any one of claims 1 to 8, characterized in that: The second mounting surface includes mounting holes, the number of the mounting holes is at least 3, and the mounting holes penetrate the second mounting surface in a direction perpendicular to the second mounting surface.

10. The loudspeaker module according to any one of claims 1 to 9, characterized in that: There are multiple speaker units, the multiple speaker units form a symmetrical structure, and the first installation surfaces of the multiple speaker units are close to each other.

11. The speaker module according to claim 10, characterized in that: There are a plurality of frames, and the number of the frames is the same as the number of the speaker units. The plurality of speaker units are respectively accommodated in corresponding frames.

12. A vehicle, characterized in that: Comprising the speaker module according to any one of claims 1 to 11, the vehicle comprises a door, the preset installation position is located on the door, and the main plane of the preset installation position is parallel to the plane direction of the door.

13. The vehicle according to claim 12, characterized in that The vehicle further comprises an outer wall, wherein the outer wall and the preset installation position enclose a receiving space, When the speaker module is fixedly connected to the preset installation position, the frame portion corresponding to the first cavity is located in the accommodating space, the opening portion is connected to the accommodating space, and the second cavity and the accommodating space together form a closed cavity.

14. The vehicle according to claim 13, characterized in that The ratio of the volume of the second cavity to the volume of the closed cavity is less than or equal to 1 / 10.

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