Loudspeaker module and vehicle

Abstract

The invention provides a loudspeaker module and a vehicle, the loudspeaker module comprises a loudspeaker unit and a frame body, and the loudspeaker unit is arranged in the frame body and is fixedly connected with the frame body through a first mounting surface; the loudspeaker unit comprises a vibrating diaphragm, the vibrating diaphragm is arranged in the loudspeaker unit in a surrounding mode, a first cavity is defined by the side, close to the first installation face, of the vibrating diaphragm and the frame, and the included angle between the sound making direction of the first cavity and the plane where the first installation face is located ranges from-30 degrees to 30 degrees. The periphery of the frame body comprises a second mounting surface which is used for fixedly connecting the loudspeaker module with 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 range of an included angle between the axial direction of the loudspeaker unit and the main plane of the second mounting surface is-30 degrees to 30 degrees. According to the loudspeaker module and the vehicle provided by the embodiment of the invention, the vibration generated at the mounting position of the loudspeaker module and near the mounting position can be effectively reduced when the loudspeaker module works, and the sound quality of the loudspeaker module is improved.

Description

Technical Field

[0001] The present application relates to the technical field of loudspeakers, and in particular, to a loudspeaker module and a vehicle. Background Art

[0002] A loudspeaker is an electroacoustic transducer that converts electrical energy into sound energy and radiates it to a distant place in the air. A dynamic loudspeaker is generally composed of a support system, a magnetic circuit system, and a vibration system. Among them, the magnetic circuit system and the vibration system are the main parts for realizing the conversion of electrical energy and sound energy. The magnetic circuit system can generate a magnetic field by powering on, which exerts a force on the voice coil in the vibration system and drives the voice coil to vibrate. The voice coil drives the vibration plate to vibrate, and the vibration plate drives the air to vibrate and finally produces sound.

[0003] 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 make abnormal noises, seriously affecting the sound quality of the speaker. Summary of the invention

[0004] 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.

[0005] 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 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 also includes a diaphragm, the diaphragm is surrounded in the speaker unit, the side of the diaphragm close to the first mounting surface and the frame form a first cavity, the sound output direction of the first cavity and the plane where the first mounting surface is located The angle range is -30°~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°~30°.

[0006] 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°, 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, reducing the noise generated by the vibration at the mounting position, and improving the sound quality of the speaker module.

[0007] 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 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.

[0008] 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 in the direction of the second cavity, thereby avoiding the sound waves radiated by the speaker module in the direction of the second cavity from affecting the sound waves radiated in the direction of the first cavity, and ensuring that the sound waves are radiated in the direction of the first cavity.

[0009] In combination with the first aspect, in some 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.

[0010] 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 from 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.

[0011] 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 a range of 1 / 4 to 3 / 4.

[0012] In the embodiment provided in the present application, the ratio of the farthest distance from the frame part corresponding to the first cavity to the main plane of the second mounting surface to 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 at the mounting position, the ratio of the installation depth of the speaker module at the preset mounting position to 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 mounting position and reducing the vibration at the mounting position when the speaker module is working.

[0013] 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.

[0014] 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 larger 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] In the embodiment provided in the present application, one 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 a 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, thereby avoiding noise generated by vibration at the mounting position and affecting the sound quality of the speaker module.

[0021] 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.

[0022] In the embodiment provided in the present application, the second mounting surface includes at least three mounting holes, and the mounting holes penetrate 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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 a main plane of the preset installation position being parallel to a plane direction of the door.

[0027] In combination with the second aspect, in certain implementations of the second aspect, the vehicle also 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.

[0028] 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.

[0029] 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 in the direction of the second cavity, avoid the sound waves radiated by the speaker module in the direction of the second cavity from affecting the sound waves radiated in the direction of 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

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of a speaker module provided in an embodiment of the present application.

[0031] Figure 2 It is a schematic diagram of the cross-sectional structure of a speaker module provided in an embodiment of the present application.

[0032] Figure 3 It is a schematic diagram of the cross-sectional structure of a speaker module provided in an embodiment of the present application.

[0033] Figure 4 This is an acoustic effect diagram of a speaker module provided in an embodiment of the present application.

[0034] Figure 5 It is a schematic diagram of the installation structure of a speaker module provided in an embodiment of the present application.

[0035] Figure 6 It is a schematic diagram of the installation structure of a speaker module provided in an embodiment of the present application.

[0036] Figure 7 This is a comparison diagram of acceleration levels at the installation position of a speaker module provided in an embodiment of the present application.

[0037] Figure 8 This is a comparison diagram of acceleration levels at the installation position of a speaker module provided in an embodiment of the present application.

[0038] Fig. 9 It is a schematic diagram of the installation structure of a speaker module provided in an embodiment of the present application.

[0039] Fig.10 It is an acoustic analog equivalent circuit diagram of a speaker module provided in an embodiment of the present application.

[0040] Fig.11 It is a schematic cross-sectional structure diagram of another speaker module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0042] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0043] In various embodiments of the present application, the first, second, etc. are only used to indicate that multiple objects are different. For example, the first cavity and the second cavity are only used to indicate different cavities. They should not have any impact on the cavity itself and the number, etc. The first, second, etc. mentioned above should not impose any limitations on the embodiments of the present application.

[0044] The terms "include", "comprising", "having" and variations thereof all mean "including but not limited to", unless specifically emphasized otherwise.

[0045] In the embodiments of the present application, the number of nouns, unless otherwise specified, means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, "more" means two or more, and "many" in "one or more" also means two or more.

[0046] Figure 1 and Figure 2 A schematic diagram of the structure of a speaker module provided in an embodiment of the present application, wherein: Figure 1 A schematic diagram of a three-dimensional structure of a speaker module provided in an embodiment of the present application. Figure 1 (a) is a schematic diagram of the overall structure of the speaker module. Figure 1 (b) is a schematic diagram of the frame structure. Figure 1 (c) is a schematic diagram of the structure of the speaker unit; Figure 2 for Figure 1 The structure shown is a schematic cross-sectional structure diagram along section AA.

[0047] See also Figure 1 and Figure 2 As shown in the structure, 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 .

[0048] The whole speaker unit 300 may be approximately a cone-shaped structure, and may include structural components such as a basin 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 basin frame 301 is the main supporting structure of the speaker unit 300, and 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 may be arranged in the basin frame 301, and the basin frame 301 may be approximately a cone-shaped structure. The material of the basin frame 301 may generally have the characteristics of light weight, not easy to deform, and good heat dissipation, and may be a metal material, for example.

[0049] The magnetic circuit system 305 may 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 piece 307 are the main components of the vibration system. The voice coil 306 may be formed by winding a wire on a pipe and placed in the magnetic gap of the magnetic circuit system 305. The diaphragm 302 may be arranged around the inner periphery of the speaker unit 300, or in other words, the diaphragm 302 may be arranged around the inner periphery of the basin frame 301, and one end of the diaphragm 302 may be connected to the voice coil 306, and the other end may be connected to the folded ring 303. Exemplarily, the diaphragm 302 may be conical, and the end with a smaller radial dimension of the conical diaphragm 302 may be connected to the voice coil 306, and the end with a larger dimension may be connected to the folded ring 303. The diaphragm 302 may also be a planar structure, an arc surface structure, etc., and the material of the diaphragm 302 may be fiber, rubber, elastomer, metal, etc. When the speaker unit 300 is powered on, the magnetic circuit system 305 generates a magnetic field, which exerts a force on the voice coil 306 and drives the voice coil 306 to vibrate. The vibration of the voice coil 306 can then drive the diaphragm 302 to vibrate. The vibration of the diaphragm 302 can push the air to vibrate, thereby generating sound. A dust cover 304 can be provided at one end of the voice coil 306 away from the magnetic circuit system 305 to prevent dust from falling into the voice coil 306 and vibrating in the voice coil 306 to generate noise.

[0050] The centering support piece 307 can be arranged between the voice coil 306 and the paper cone. The centering support piece 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. The axial direction of the speaker unit 300 can also be called the normal direction of the diaphragm 302. The centering support piece 307 can be made of cotton fabric, fiber material and the like. The folding ring 303 can be an annular structure. The folding ring 303 can be arranged at the end of the speaker unit 300 with a larger radial dimension along the circumferential direction, and the folding ring 303 can be connected to the other end of the diaphragm 302. The folding ring 303 can also be used to ensure that the diaphragm 302 moves along the axial direction of the speaker without moving in the lateral direction. The folding ring 303 can be made of plastic, natural rubber, paper and the like, and is bonded to the diaphragm 302 by hot 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.

[0051] The speaker unit 300 can be arranged in the frame 200, and the speaker unit 300 can include a first mounting surface 310. The first mounting surface 310 can be arranged at the end of the speaker unit 300 with a 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 surrounded in 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, bonding, etc. Exemplarily, the first mounting surface 310 of the speaker unit 300 may include one or more through holes 308, for example, four through holes 308 as shown in the figure, and the frame 200 may include one or more through holes 221 at positions corresponding to the through holes 308, and then screws may be sequentially passed through the through holes 308 and the through holes 221, so that the frame 200 can be fixedly connected to the speaker unit 300. The middle and tail of the speaker unit 300 may also be provided with through holes, for example, a through hole 309 may also be provided at the middle position of the speaker unit 300, and correspondingly, a through hole (not shown in the figure) may also be provided at a corresponding position in the frame 200, so that the connection between the speaker unit 300 and the frame 200 is more stable.

[0052] 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 of the side wall 210 may be located on the rear side of the speaker unit 300 .

[0053] The outer periphery of the frame 200 may include a second mounting surface 211, and the second mounting surface 211 may be used to fix the speaker module 10 to a preset mounting position. The second mounting surface 211 may be arranged on the outer periphery of the side wall 210 of the frame 200, and the main plane of the second mounting surface 211 may 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. Figure 1 and Figure 2 The main plane of the second mounting surface 211 of the speaker module 10 shown 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, so that the connection between the second mounting surface 211 and the preset mounting position is more stable. The second mounting surface 211 can include mounting holes 2111, the number of which can be at least 3 and can be evenly distributed on the second mounting surface 211. The mounting holes 2111 can 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 preset mounting position of the speaker module 10 by screwing. The preset mounting position of the speaker module 10 can be an infinite baffle in the vehicle cabin, for example, it can be a position such as a sheet metal inside a door, an interior panel, a floor or a ceiling.

[0054] It should be noted that in the embodiments of the present application, two structural members being parallel to each other may refer to two structural members being approximately parallel to each other rather than being absolutely parallel to each other. Those skilled in the art may understand that due to the errors caused by product production, two structural members being parallel to each other may allow for 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 may be considered to be parallel to each other. Similarly, two structural members being perpendicular to each other may refer to being approximately perpendicular to each other.

[0055] The bottom wall 230 may 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 toward the negative direction of the y-axis, and be fixedly connected to the side wall 210. The bottom wall 230 may be fixedly connected to the inner periphery of the side wall 210, or may be fixedly connected to the bottom end of the side wall 210.

[0056] The bottom wall 230 may have a wedge-shaped, square-shaped, arc-shaped, flat-shaped, or irregular-shaped shape, etc., which is not limited in the present application.

[0057] The side of the diaphragm 302 of the speaker unit 300 close to the first mounting surface 310 can enclose a first cavity 240 with the frame 200, and the first cavity 240 is the space enclosed by the side of the diaphragm 302 close to the first mounting surface 310 and the bottom wall 230 and the side wall 210. The first cavity 240 can also be called the front cavity of the speaker module 10, and the side of the diaphragm 302 close to the first mounting surface 310 of the speaker unit 300 can also be called the front part of the diaphragm 302 of the speaker unit 300.

[0058] The side of the first mounting surface 310 of the frame 200 close to the speaker unit 300 may include an open surface 241, or the portion of the frame 200 located in the front of the speaker unit 300 may include an open surface, and the 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 first mounting surface 310 of the frame 200 close to 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, for the speaker module shown in the figure, 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 a first open surface 241, and when the plane where the upper end of the side wall 210 is located 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.

[0059] 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, etc.

[0060] The volume setting of the first cavity 240 can make the ratio of the acoustic cutoff frequency of the speaker module 10 to the resonant frequency of the speaker module 10 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, so that the speaker module can have a wider working frequency band and ensure the acoustic performance of the speaker module 10. The acoustic cutoff frequency can refer to the frequency at which a system starts to not pass signals at a certain frequency.

[0061] 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.

[0062] 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 top of the second mounting surface 211 may refer to the top of the second mounting surface 211 in the z-axis direction shown in the figure. The top wall 220 may extend backward from the first mounting surface 310 of the speaker unit 300 to the tail of the speaker unit 300, and be connected to the side wall 210 located at the tail of the speaker unit 300. The portion of the top wall 220 connected to the side wall 210 may be connected to the inner circumference of the side wall 210, or may be connected to the top of the side wall 210. When the overall structure of the speaker unit 300 is approximately conical, the tail of the speaker unit 300 is the end of the speaker unit 300 with a smaller radial dimension. The top wall 220 may also continue to extend forward from the first mounting surface 310, that is, to Figure 1 The negative direction of the y-axis shown continues to extend, and it is only necessary to ensure that the top wall 220 is not completely connected to the side wall 210 located at the front end of the first mounting surface 310 to form a first open surface 241 .

[0063] Some of the through holes 221 can be arranged at the position of the top wall 220 close to the first mounting surface 310, for example, they can be arranged on the left and right sides of the top wall 220, and are respectively 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 first mounting surface 310 of the top wall 220 close to 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 the shape of the speaker unit 300, and a wedge surface is formed 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, etc., which is not limited in this application.

[0064] The side of the diaphragm 302 of the speaker unit 300 that faces away from the first mounting surface 310 can enclose a second cavity 250 with the frame 200, that is, a space enclosed by the side of the diaphragm 302 that faces away from the first mounting surface 310, the side wall 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 that faces 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 may 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 may be formed between the tail of the speaker unit 300 and the side wall 210. The second open surface 251 may also be referred to as an opening portion 251. The opening portion 251 may make the second cavity 250 an open cavity, and the opening direction of the opening portion 251 may be perpendicular to the main plane of the second mounting surface 211. Thus, the speaker module 10 may radiate sound waves outward along the opening direction, that is, may propagate sound wave energy outward along the negative direction of the z-axis shown in the figure.

[0065] The bottom wall 230 of the speaker module 10 may 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 portion 251 is formed at the rear of the speaker unit 300.

[0066] The bottom wall 230 of the frame 200 can be arranged below the second mounting surface 211, and the bottom of the second mounting surface 211 is the bottom of the second mounting surface 211 in the z-axis direction shown in the figure. Some of the through holes 221 can also be arranged at the bottom wall 230 near the first mounting surface 310 of the speaker unit 300, for example, they can be arranged on the left and right sides of the bottom wall 230, and are respectively fixedly connected to the two through holes 308 on the lower side of the first mounting surface 310, so that the frame 200 is fixedly connected to the speaker unit 300. The connection position of the bottom wall 230 with the first mounting surface 310 can form a sealing surface. Exemplarily, the shape of the first mounting surface 310 of the bottom wall 230 near the speaker unit 300 can be the same as the shape of the first mounting surface 310, so that the periphery of the first mounting surface 310 of the speaker unit 300 can be respectively attached to the top wall 220 and the side wall 210 of the frame 200, so that the connection surface between the speaker unit 300 and the frame 200 forms a sealing surface. Further, 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 is formed at the connection position between the frame 200 and the speaker unit 300, which can isolate the front and rear cavities of the speaker unit 300, avoid the front and rear sound waves from canceling each other, and improve the radiation efficiency of the sound waves toward the first cavity 240.

[0067] 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 a plurality of parts fixedly connected by welding or the like.

[0068] 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 the design requirements, the "same" size of two structural parts allows deviations within a certain range, such as a difference of 0.1mm-0.5mm.

[0069] In some embodiments, the speaker module 10 may further include a first sub-cavity 231, which may be disposed at the periphery of the frame 200 and may be connected to the first cavity 240. The first sub-cavity 231 may also be referred to as a side branch cavity. Figure 3 The structure shown in Figure 3The structure shown may be a cross-sectional structure of the speaker module 10 along the yz plane, the side branch cavity 231 may be arranged at the periphery of the bottom wall 230, and a through hole 232 may be provided on the bottom wall 230 to connect the side branch cavity 231 with the first cavity 240. There may be a plurality of side branch cavities 231, and the plurality of side branch cavities 231 may be arranged at different positions of the bottom wall 230, and the plurality of side branch cavities 231 may be connected with the first cavity 240. The plurality of side branch cavities 231 may have different resonance frequencies.

[0070] The first sub-cavity 231 may also be disposed in the frame 200 (not shown in the figure). For example, the first sub-cavity 231 may be disposed 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.

[0071] Figure 4 The acoustic effect diagram of the embodiment of the present application with and without the side branch cavity 231 is shown, wherein the horizontal axis is the sound wave frequency (in Hz) and the vertical axis is the acoustic transfer function amplitude (in dB). The 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.

[0072] In some embodiments, the side of the second mounting surface 211 close to the preset mounting position may further include a shock absorbing pad 2113, and the material of the shock absorbing pad 2113 may be, for example, rubber, plastic, or a composite material. The location of the shock absorbing pad 2113 may be as shown in FIG. Figure 5 The structure shown in Figure 5 The door inner sheet metal 41 is taken as an example as the preset installation position for description.

[0073] As an example, Figure 5 As shown in (a), the shock-absorbing pad 2113 can be arranged 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 to the normal direction of the preset mounting position, reduce the vibration of the preset mounting position in the normal direction, and thus 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 it is arranged on the lower side of the entire second mounting surface 211, and 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 corresponds to an opening (not shown in the figure), so that the screw can pass through the mounting hole 2111 and the opening and be screwed to the preset mounting position.

[0074] As another example, Figure 5 As shown in (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, it can be perpendicular to the inner door sheet metal 41. The shock absorbing pad 2113 can also be an annular structure, and the main plane of the shock absorbing pad 2113 can be mutually attached to 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.

[0075] The speaker module 10 may include one shock absorbing pad 2113, or may include multiple shock absorbing pads 2113, for example, Figure 5 The shock absorbing pad 2113 can be set at the position shown in (a) of Figure 5 A shock-absorbing pad 2113 is provided at the position shown in (b).

[0076] The second mounting surface 211 may further include a support member 2112, which may be disposed on a side of the second mounting surface 211 away from the preset mounting position, for example, disposed on the upper side of the second mounting surface 211 in the z-axis direction shown in the figure. 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, and the support member 2112 may make the connection between the second mounting surface 211 and the side wall more stable, thereby making the connection between the speaker module 10 and the preset mounting position more stable.

[0077] In some embodiments, the angle between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 can range from -30° to 30°, and the angle between the sound output direction of the first cavity 240 and the plane where the first mounting surface 310 is located can range from -30° to 30°.

[0078] See also Figure 6The schematic diagram of the installation of the speaker module at the preset installation position is shown. 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 door, that is, the preset installation position can be located on the door, and the preset installation position can be located on the inner sheet metal 41 of the door. The preset installation position can be a partial area on the inner sheet metal 41 of the door, for example, it can be a part that directly contacts the second installation surface 211 of the speaker module. The inner sheet metal 41 of the door can include a mounting hole, and the speaker module 10 can be embedded in the mounting hole and installed at the inner sheet metal 41 of the door 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 flat part of the door inner sheet metal 41 to make the connection between the speaker module and the door inner sheet metal more stable.

[0079] The vehicle door may further include an outer wall, which may be a door outer sheet metal 43, and a sheet metal inner space 42 may be formed between the door inner sheet metal 41 and the door outer sheet metal 43. The sheet metal inner space 42 may be a hollow structure and have 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 to the sheet metal inner space 42 to dissipate the sound waves propagated by the speaker module 10 toward the second cavity 250, thereby ensuring that the sound waves propagate toward the first cavity 240.

[0080] The angle between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 may be α. Figure 6 In the installation structure diagram shown in (a), the angle α between the axial direction of the speaker unit 300 and the second installation surface 211 is 0°, and the axial direction of the speaker unit 300 is parallel to the main plane of the second installation surface 211. The speaker module 10 in the installation structure diagram can be Figure 1 and Figure 2 The speaker module 10 shown. 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 accommodation space outside the cabin, such as Figure 6 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, it may be away from the direction of the accommodation space outside the cabin, such as Figure 6 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 in the range of -30° to 30°, for example, the tail of the speaker unit 300 can be rotatably connected to the frame 200.

[0081] The angle β between the sound direction of the speaker module 10 or the sound 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. Figures 1 to 3 In the speaker module 10 shown, 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. Figures 1 to 3 In the structure shown in FIG. 1 , the sound emitting direction of the speaker module 10 can be perpendicular to the main plane of the second mounting surface 211, or in other words, the sound emitting direction of the speaker module 10 can be perpendicular to the plane direction surrounded by the upper ends of the side walls 210, that is, perpendicular to the plane where the open surface 241 is located, see FIG. Figure 2 or Figure 3 Specifically, when the speaker module 10 is pressed Figure 6 When the structure shown in (a) is installed, 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 output direction changes and propagates out of the frame 200. The sound output direction of the speaker module 10 or the sound output direction of the first cavity 240 can be the final sound output direction after the direction is changed when encountering the frame 200. Figure 6 In the structure shown in (a) of FIG. 1 , the angle between the sound emitting 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 pressed Figure 6 When the structure shown in (b) is installed, the angle between the sound output direction of the speaker module 10 and the plane where the first installation surface 310 is located can be a negative value, for example, -30°; Figure 6When the structure shown in (c) is installed, the angle between the sound output direction of the speaker module 10 and the plane where the first installation surface 310 is located can be a positive value, for example, 30°.

[0082] When the opening direction of the speaker unit 300 is directly toward the direction inside the cabin, that is, the axial direction of the speaker unit 300 is perpendicular to the second mounting surface 211, and the sound output direction is perpendicular to the plane where the first mounting surface 310 is located, as shown in FIG. Figure 6 As shown in (d) in FIG. 1 , the sound wave energy generated by the speaker unit 300 can be directly transmitted along Figure 6 The z-axis direction shown in the figure propagates toward the inside of the cabin, as shown in the figure. Figure 6 The direction is indicated by the solid arrow in (d). The tangential stiffness of the second mounting surface 211 is much greater than the normal stiffness, that is, the stiffness of the door inner sheet metal 41 along the y-axis direction is much greater than the stiffness in the z-axis direction. The smaller the stiffness, the easier it is to be subjected to force and vibrate. When the sound wave energy propagates along the z-axis direction, the force direction of the door inner sheet metal is also the z-axis direction, that is, the direction indicated by the dotted arrow in the figure, which can easily cause the door inner sheet metal 41 to vibrate in the z-axis direction, thereby generating abnormal sound and affecting the sound quality of the speaker module 10.

[0083] 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 door and the position to which the sheet metal 41 inside the 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.

[0084] Exemplarily, 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 range from ±30°, ±25°, ±20°, ±15°, ±10°, ±5°, etc.

[0085] Figure 7 This is a comparison diagram of the acceleration effects at different installation angles provided in the embodiment of the present application. When the acceleration level is larger, the vibration at the installation position is more severe. Figure 7As shown, when the forward installation method is adopted, that is, the angle between the axial direction of the speaker unit 300 and the second mounting surface 211 is 90°, the average acceleration level at the mounting position is 188dB; when the angle between the axial direction of the speaker unit 300 and the second mounting surface is 0°, the average acceleration level at the mounting position is 155dB; when the angle between the axial direction of the speaker unit 300 and the second mounting surface 211 is ±5°, the average acceleration level at the mounting position is 167dB; when the angle between the axial direction of the speaker unit 300 and the second mounting surface 211 is ±15°, the average acceleration level at the mounting position is 176dB; when the angle between the axial direction of the speaker unit 300 and the second mounting surface 211 is ±30°, the average acceleration level at the mounting position is 182dB. 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.

[0086] 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 size 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 called the installation depth of the second mounting surface. Figure 6As shown in (a) to (c) in the figure, the preset installation 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, and the outer door sheet metal 43 is the outer wall of the vehicle. The farthest distance from the frame part corresponding to the first cavity 240 to the main plane of the second mounting surface is h1 shown in the figure. The size of the speaker module 10 in the direction perpendicular to the main plane of the second mounting surface 211 can be the sum of the distance from the end of the part of the speaker module 10 located in the accommodation space farthest from the main plane of the second mounting surface 211 to the main plane of the second mounting surface 211, and the distance from the end of the part of the speaker module 10 located outside the accommodation space farthest from the main plane of the second mounting surface 211 to the main plane of the second mounting surface 211, that is, h2 shown in the figure. The size of the speaker module 10 in the direction perpendicular to the main plane of the second mounting surface 211 can also be called the height of the speaker module 10. The ratio of the installation depth of the speaker module 10 to the size of the speaker module 10 in the direction perpendicular to the main plane of the second installation 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 position and reduce the vibration at the installation position of the speaker module.

[0087] Figure 8 This is a comparison diagram of the acceleration effect at the installation position at different installation depths provided in the embodiment of the present application. Figure 8 As shown, when the installation depth of the speaker module is 0, that is, 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.

[0088] Continue to see Figure 6As shown in the schematic diagram of the installation structure, 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 sheet metal inside the vehicle door, 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 sheet metal inside the vehicle door 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 dissipating 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.

[0089] 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.

[0090] Fig. 9 Another installation structure diagram provided in the embodiment of the present application can be a top view of the speaker module 10, that is, a schematic diagram of the overall structure when looking at the speaker module 10 along a plane perpendicular to the door. When the speaker module 10 is installed on the door inner sheet metal 41, the plane where the first installation surface 310 of the speaker unit 300 is located can be parallel to the lower contour line of the door inner sheet metal 41, or parallel to the ground direction, that is, parallel to the x-axis direction shown in the figure, such as Fig. 9 The angle relationship between the dotted line in the figure and the bottom of the door inner sheet metal 41 is such that the sound outlet of the speaker module 10 is located at the upper half of the speaker module 10, or the first open surface 241 of the speaker module 10 is located at the upper half of the speaker module 10, that is, at the part of the speaker module 10 away from the ground, such as Fig. 9 As shown in (a) in the figure, or the sound outlet of the speaker module 10 can also be located at the lower half 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 tilted to form a certain angle with the lower contour line of the sheet metal 41 inside the door, 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 (a) in the figure. Fig. 9As shown in (b) of the figure, 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 installation surface 310 of the speaker unit 300 is located can also be perpendicular to the lower contour line of the sheet metal 41 inside the door, 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 the figure. Fig. 9 As shown in (c) in the figure, 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).

[0091] It should be noted that Fig. 9 The mounting structure shown in the figure is only used as an installation example of the speaker module 10 at the mounting position, and the mounting position of the speaker module 10 should not be limited. The speaker module 10 can be installed at the mounting 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.

[0092] Fig. 9 The structure shown in can be a schematic diagram of the installation structure when the plane where the first installation surface 310 is located is perpendicular to the second installation 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 installation surface 211. When the axial direction of the speaker unit 300 and the main plane of the second installation surface 211 are in the angle relationship described above, the first installation 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.

[0093] Fig.10 The circuit diagram shown is an acoustic analog equivalent circuit diagram of the speaker module 10 provided in the embodiment of the present application, wherein the power source P is equivalent to the magnetic circuit system 305 in the speaker unit 300, and the magnetic force generated by the power supply of the magnetic circuit system 305 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, and 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 source P, the resistor Ras, the capacitor Cas and the inductor Mas can together constitute the speaker unit 300, the capacitor Cab can be equivalent to the back cavity of the speaker module 10, and 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 flow at the sound volume velocity, and there can be a certain sound volume velocity in the front cavity and the back cavity of the speaker module, and the vibration velocity in the front and back cavities can be the same.

[0094] In some embodiments, the number of speaker units 300 may be multiple, and the multiple speaker units 300 may form a symmetrical structure. Fig.11 A schematic cross-sectional structure diagram of another loudspeaker module provided in an embodiment of the present application is shown in FIG. Fig.11 As shown, the number of the speaker units 300 can be 2, and the two speaker units 300 can be arranged relatively to form an axisymmetric structure. Correspondingly, the number of the frame 200 can also be multiple, and the number of the frame 200 can be the same as the number of the speaker units 300. For example, when the number of the speaker units 300 is 2, the number of the frame 200 can also be 2, so that the multiple speaker units 300 can be accommodated in the corresponding frame 200 respectively. The two speaker units 300 and the corresponding frame 200 can be independent speaker modules, that is, forming two speaker modules, and the two speaker modules are arranged relatively and fixedly connected to the preset installation positions respectively. The two speaker units 300 can also form a speaker module with the corresponding frame 200, that is, the two frames 200 can be fixedly connected, or they can also be an integrated structure, for example, the two frames 200 can share side walls to form a frame 200. A plurality of speaker units 300 are provided, and the plurality of speaker units 300 form a symmetrical structure, which can further reduce the vibration generated at the installation position, and can increase the sound pressure of the speaker module, thereby improving the sound performance.

[0095] The speaker module provided in the embodiment of the present application may be a bass speaker module, and the operating frequency of the speaker module may be less than 80 Hz.

[0096] The embodiment of the present application also provides a vehicle, which may include: Figures 1 to 9 Any of the speaker modules 10 described above 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 position 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 installation hole. In addition, 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 losing the sound waves propagated by the speaker module to the side where the second cavity is located, so as to optimize the sound effect of the first cavity side. The ratio of the volume of the second cavity 250 to the volume of the closed cavity may be less than or equal to 1 / 10, so as to further enhance the bass effect of the first cavity 240 .

[0097] It should be noted that the speaker module can also be installed at other preset installation positions inside the vehicle, as long as the preset installation position can form a sealed space with the speaker module. Similarly, the speaker module can also be set outside the vehicle, or set at other positions that can form a sealed space with the speaker module, such as a wall, a sound box, etc. This application does not limit the application scenario and preset installation position of the speaker module.

[0098] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope 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 multiple frames, and the number of the frames is the same as the number of the speaker units. The multiple 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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