Speaker module and vehicle

Abstract

This application provides a speaker module and a vehicle. The speaker module includes a speaker unit and a frame body. The speaker unit is disposed within the frame body and attached to the frame body via a first mounting surface. The speaker unit includes a diaphragm. The diaphragm is disposed around the inner periphery of the speaker unit. A first cavity is formed by the frame body and a surface of the diaphragm closest to the first mounting surface. An included angle between the sound output direction of the first cavity and a plane on which the first mounting surface is located is in the range of -30° to 30°. The outer periphery of the frame body includes a second mounting surface configured to mount the speaker module at a predetermined mounting position. The main plane of the second mounting surface is parallel to the main plane of the predetermined mounting position. An included angle between the axial direction of the speaker unit and the main plane of the second mounting surface is in the range of -30° to 30°. The speaker module and vehicle provided in the embodiments of this application can effectively reduce vibrations that occur at and around the mounting position of the speaker module during operation of the speaker module, thereby improving the sound quality of the speaker module.

Description

[Technical Field]

[0001] This application claims priority to Chinese Patent Application No. 202311043580.8, entitled "Speaker Module and Vehicle," filed on August 17, 2023, which is incorporated herein by reference in its entirety.

[0002] This application relates to the field of speaker technology, and in particular to speaker modules and vehicles. [Background technology]

[0003] A speaker is an electro-acoustic transducer that converts electrical energy into acoustic energy and radiates it far into the air. A moving coil speaker typically consists of a support system, a magnetic circuit system, and a vibration system. The magnetic circuit system and vibration system are the main components for converting between electrical energy and acoustic energy. When the magnetic circuit system is powered on, it generates a magnetic field, which applies force to the voice coil in the vibration system, driving the voice coil to vibrate. The voice coil drives the diaphragm to vibrate, and the diaphragm drives the air to vibrate, ultimately producing sound.

[0004] Due to the interaction of forces, the alternating force exerted on the voice coil by the magnetic circuit system causes the voice coil to vibrate and radiate sound waves, and in this process the magnetic circuit system receives a reaction force, which vibrates the speaker unit body or electroacoustic conversion components, etc. As a result, components such as the mounting surface of the speaker module vibrate, generating abnormal noise and significantly affecting the sound quality of the speaker. Summary of the Invention

[0005] This application provides a speaker module and a vehicle that can effectively reduce vibrations that occur at and near the mounting position of the speaker module during operation of the speaker module, thereby improving the sound quality of the speaker module.

[0006] According to a first aspect, a speaker module is provided, the speaker module including a speaker unit and a frame body. The speaker unit is disposed within the frame body. The speaker unit includes a first mounting surface. The first mounting surface is located at an end of the speaker unit having a larger radial size. The speaker unit is attached to the frame body via the first mounting surface. The speaker unit further includes a diaphragm. The diaphragm is disposed on the inner periphery of the speaker unit. A first cavity is formed by the frame body and a surface of the diaphragm closer to the first mounting surface. An included angle between the sound output direction of the first cavity and a plane on which the first mounting surface is located is in the range of -30° to 30°. The outer periphery of the frame body includes a second mounting surface. The second mounting surface is configured to mount the speaker module to a predetermined mounting position. A major plane of the second mounting surface is parallel to a major plane of the predetermined mounting position. The included angle between the axial direction of the speaker unit and the main plane of the second mounting surface is in the range of −30° to 30°.

[0007] In this embodiment provided in this application, the incident angle between the axial direction of the speaker unit and the second mounting surface is in the range of -30° to 30°, and the incident angle between the sound output direction of the first cavity and the plane on which the first mounting surface is located is in the range of -30° to 30°. In this way, it is possible to reduce sound wave energy transmitted in a direction perpendicular to the second mounting surface, thereby reducing vibrations generated at and near the mounting position of the speaker module during operation of the speaker module, reducing noise generated by vibrations at the mounting position, and improving the sound quality of the speaker module.

[0008] In some implementations of the first aspect, a second cavity can be formed by the frame body and a surface of the diaphragm that does not face the first mounting surface. The second cavity and the first cavity are disposed on opposite sides of the second mounting surface in a direction perpendicular to the main plane of the second mounting surface. Furthermore, the frame body includes an opening such that the second cavity is an open cavity. The opening direction of the opening is perpendicular to the main plane of the second mounting surface.

[0009] In the embodiment provided in this application, the frame body and the surface of the diaphragm that does not face the first mounting surface form a second cavity, and the second cavity is an open cavity. After the speaker module is mounted in the mounting position, the open second cavity and the accommodation space of the mounting position form an infinite rear cavity, which can eliminate sound waves radiated by the speaker module in the direction of the second cavity and prevent 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. This ensures that sound waves are radiated in the direction of the first cavity.

[0010] With reference to the first aspect, in some implementations of the first aspect, a sealing surface is formed between the first mounting surface and the frame body such that the first cavity is isolated from the second cavity.

[0011] In this embodiment provided in this application, the first mounting surface of the speaker unit is attached to the frame body, and a sealing surface is formed to isolate the first cavity from the second cavity, which can prevent the sound waves emitted by the speaker module toward the second cavity from affecting the sound waves emitted toward the first cavity, and ensure the sound-producing performance of the first cavity.

[0012] With reference to the first aspect, in some implementations of the first aspect, the ratio of the maximum distance from the frame body portion corresponding to the first cavity to the main plane of the second mounting surface to 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.

[0013] In this embodiment provided in this application, the ratio of the maximum distance from the frame body portion corresponding to the first cavity to the main plane of the second mounting surface to 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. Thus, when the speaker module is placed in the mounting position, it is possible to ensure that the ratio of the mounting depth of the speaker module in the predetermined 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 predetermined mounting position and reducing vibration of the speaker module at the mounting position during operation.

[0014] Referring to the first aspect, in some implementations of the first aspect, the volume of the first cavity is 0.1 liters or more.

[0015] In the embodiment provided in this application, the volume of the first cavity is equal to or greater than 0.1 liters, so that the acoustic cutoff frequency of the speaker module can be much higher than the resonance frequency of the speaker module, thus ensuring that the speaker module has a wide operating band and ensuring the acoustic performance of the speaker.

[0016] With reference to 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 4 or greater.

[0017] In this embodiment provided in this application, due to the volume design of the first cavity, the ratio of the acoustic cutoff frequency of the speaker module to the resonance frequency of the speaker module is greater than or equal to 4, so that the speaker module has a wide operating band and ensures the acoustic performance of the speaker module.

[0018] Referring to the first aspect, in some implementations of the first aspect, the speaker module further includes at least one first sub-cavity, the at least one first sub-cavity communicating with the first cavity.

[0019] In this embodiment provided in this application, the speaker module includes at least one first sub-cavity, which is in communication with the first cavity, so that the resonance peak of the first cavity of the speaker module can be reduced, the bandwidth can be widened, and the acoustic performance of the speaker module can be improved.

[0020] With reference to the first aspect, in some implementations of the first aspect, a surface of the second mounting surface closer to the predetermined mounting position includes a shock absorbing pad.

[0021] In this embodiment provided in this application, the surface of the second mounting surface closer to the predetermined mounting position includes a shock absorbing pad, which can reduce sound energy transmitted in a direction perpendicular to the second mounting surface, thereby reducing vibrations generated at and near the mounting position of the speaker module during operation of the speaker module, and preventing noise generated by vibrations at the mounting position from affecting the sound quality of the speaker module.

[0022] In some implementations of the first aspect, the second mounting surface includes mounting holes, and there are at least three mounting holes. The mounting holes extend through the second mounting surface in a direction perpendicular to the second mounting surface.

[0023] In this embodiment provided in this 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, thereby improving the stability of the connection between the speaker module and the predetermined mounting position.

[0024] Referring to the first aspect, in some implementations of the first aspect, there are a plurality of speaker units, the plurality of speaker units forming a symmetrical structure, and the first mounting surfaces of the plurality of speaker units being adjacent to each other.

[0025] In this embodiment provided in this application, the multiple speaker units form a symmetrical structure, and the first mounting surfaces of the multiple speaker units are close to each other, so that the sound pressure of the speaker module can be increased, the acoustic performance of the speaker module can be improved, and the vibration at a predetermined mounting position can be further reduced.

[0026] With reference to the first aspect, in some implementations of the first aspect, there are a plurality of frame bodies. The number of frame bodies is the same as the number of speaker units. The plurality of speaker units are housed in corresponding frame bodies, respectively.

[0027] According to a second aspect, there is provided a vehicle, the vehicle including a speaker module according to the first aspect or any one of the possible implementations of the first aspect, the vehicle including a vehicle door, the predetermined mounting location being located on the vehicle door, and the main plane of the predetermined mounting location being parallel to the plane direction of the vehicle door.

[0028] Referring to the second aspect, in some implementations of the second aspect, the vehicle further includes an exterior wall. The exterior wall and the predetermined mounting position form a storage space. When the speaker module is mounted at the predetermined mounting position, a frame body portion corresponding to the first cavity is positioned within the storage space. The opening communicates with the storage space. The second cavity and the storage space form a closed cavity.

[0029] With reference to the second embodiment, in some implementations of the second embodiment, the ratio of the volume of the second cavity to the volume of the closed cavity is 1 / 10 or less.

[0030] In this embodiment provided in this application, when the speaker module is mounted in a predetermined mounting position, the opening allows the second cavity to communicate with the receiving space formed in the mounting position, and a closed cavity is formed, thereby eliminating sound waves radiated by the speaker module in the direction of the second cavity and preventing 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. Thus, sound waves are ensured to be 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 1 / 10 or less, which further improves the sound generation performance of the first cavity of the speaker module. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a diagram of a three-dimensional structure of a speaker module according to an embodiment of the present application. [Figure 2] FIG. 1 is a cross-sectional view of a speaker module according to an embodiment of the present application. [Figure 3] FIG. 1 is a cross-sectional view of a speaker module according to an embodiment of the present application. [Figure 4] FIG. 2 is a diagram of the acoustic effect of a speaker module according to an embodiment of the present application. [Figure 5] 1 is a diagram of a mounting structure of a speaker module according to an embodiment of the present application; [Figure 6] 1 is a diagram of a mounting structure of a speaker module according to an embodiment of the present application; [Figure 7] FIG. 10 is a diagram of a comparison between acceleration levels at mounting locations of a speaker module according to one embodiment of the present application. [Figure 8] FIG. 10 is a diagram of a comparison between acceleration levels at mounting locations of a speaker module according to one embodiment of the present application. [Figure 9] 1 is a diagram of a mounting structure of a speaker module according to an embodiment of the present application; [Figure 10] FIG. 2 is an acoustic-like equivalent circuit diagram of a speaker module according to one embodiment of the present application. [Figure 11] FIG. 10 is a cross-sectional view of another speaker module according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0032] The technical solutions of this application will be described below with reference to the accompanying drawings.

[0033] References in this specification to "one embodiment" or "some embodiments," etc., mean that one or more embodiments of this application include the particular feature, structure, or characteristic described in combination with that embodiment. Thus, the appearances of phrases such as "in one embodiment," "in some embodiments," "in some other embodiments," and "in other embodiments" in various places in this specification do not necessarily refer to the same embodiment. Rather, these phrases mean "one or more, but not all, of the embodiments," unless specifically emphasized otherwise.

[0034] In the embodiments of this application, the terms "first" and "second" are merely intended to indicate that multiple objects are different. For example, a first cavity and a second cavity are merely used to represent different cavities. These terms should not have any effect on the cavities and their number. The terms "first" and "second" above should not impose any limitations on the embodiments of this application.

[0035] The terms "including," "containing," "having," and variations of these terms all mean "including, but not limited to," unless expressly stated otherwise.

[0036] In the embodiments of this application, unless otherwise specified, the number of nouns refers to "singular or plural," i.e., "one or more." "At least one" means one or more, "plural" means two or more, and "more" in "one or more types" means two or more of the same type.

[0037] Figures 1 and 2 are diagrams of the structure of a speaker module according to an embodiment of this application. Figure 1 is a diagram of the three-dimensional structure of a speaker module according to one embodiment of this application. (a) in Figure 1 is a diagram of the overall structure of the speaker module, (b) in Figure 1 is a diagram of the structure of the frame body, and (c) in Figure 1 is a diagram of the structure of the speaker unit. Figure 2 is a diagram of the cross-sectional structure along the AA cross section of the structure shown in Figure 1.

[0038] Please refer to the structures shown in Figures 1 and 2. The speaker module 10 may include a speaker unit 300 and a frame body 200, and the speaker unit 300 may be disposed within the frame body 200.

[0039] The entire speaker unit 300 may have a roughly tapered structure, and may include structural components such as a basket 301, a magnetic circuitry 305, a voice coil 306, a diaphragm 302, a damper 307, a surround 303, and a dust cap 304. The basket 301 is the main support structure of the speaker unit 300. Components such as the magnetic circuitry 305, the voice coil 306, the diaphragm 302, the damper 307, the surround 303, and the dust cap 304 may be disposed within the basket 301, and the basket 301 may have a roughly tapered structure. Typically, the material of the basket 301 may have characteristics such as light weight, resistance to deformation, and good heat dissipation. For example, the material may be a metal material.

[0040] The magnetic circuit system 305 may include a magnet, a soft magnetic material washer, and a yoke. The voice coil 306, the diaphragm 302, and the damper 307 are the main components of the vibration system. The voice coil 306 may be formed by winding a conductive wire around a pipe material and may be disposed within the magnetic clearance of the magnetic circuit system 305. The diaphragm 302 may be disposed around the inner periphery of the speaker unit 300. In other words, the diaphragm 302 may be disposed around the inner periphery of the basket 301. One end of the diaphragm 302 may be connected to the voice coil 306, and the other end may be connected to the surround 303. For example, the diaphragm 302 may be a tapered diaphragm. The end of the tapered diaphragm 302 having a smaller radial size may be connected to the voice coil 306, and the end of the tapered diaphragm 302 having a larger radial size may be connected to the surround 303. Alternatively, the diaphragm 302 may have a planar or arcuate structure, and the material of the diaphragm 302 may be fabric, rubber, elastomer, or metal. When the speaker unit 300 is powered on, the magnetic circuitry 305 generates a magnetic field, which exerts a force on the voice coil 306, driving the voice coil 306 to vibrate. The vibration of the voice coil 306 drives the diaphragm 302 to vibrate, which in turn drives the air to vibrate. Thus, sound is generated. To prevent noise during the vibration of the voice coil 306, a dust cap 304 may cap the end of the voice coil 306 away from the magnetic circuitry 305 to prevent dust from getting into the voice coil 306.

[0041] The damper 307 may be disposed between the voice coil 306 and the paper container. The damper 307 may be configured to ensure that the voice coil 306 moves within the magnetic clearance in the axial direction of the speaker unit 300, rather than in the lateral direction. The axial direction of the speaker unit 300 is the y-axis direction shown in the figure. The axial direction of the speaker unit 300 may also be referred to as the normal direction of the diaphragm 302. The damper 307 may be made of a material such as cotton fabric or a fibrous material. The surround 303 may have a ring-like structure. The surround 303 may be disposed circumferentially at the end of the speaker unit 300 with a larger radial size, and the surround 303 may be connected to the other end of the diaphragm 302. The surround 303 may also be configured to ensure that the diaphragm 302 moves in the axial direction of the speaker, rather than in the lateral direction. The surround 303 can be made of materials such as plastic, natural rubber, or paper, and is hot pressed to adhere to the diaphragm 302. The damper 307 and surround 303 cooperate to ensure that the diaphragm 302 and voice coil 306 move axially within a certain range.

[0042] The speaker unit 300 may be disposed within the frame body 200 and may include a first mounting surface 310. The first mounting surface 310 may be disposed at an end of the speaker unit 300 with a larger radial size, and the first mounting surface 310 may have a planar structure. In other words, the first mounting surface 310 may be parallel to the xz plane shown in the figure. Because the diaphragm 302 is disposed around the interior of the speaker unit 300, the first mounting surface 310 may be located on the front portion of the diaphragm 302, i.e., in the positive direction of the y-axis. The first mounting surface 310 may be located closer to the origin of the y-axis than the diaphragm 302. The first mounting surface 310 may be attached to the frame body 200, for example, by screwing or adhesively attaching it to the frame body 200. For example, 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. The positions of the frame body 200 corresponding to the through holes 221 may include one or more through holes 308, so that screws can be passed through the through holes 308 and the through holes 221 in order to attach the frame body 200 to the speaker unit 300. Through holes may also be arranged in the mid-portion and tail-portion of the speaker unit 300. For example, a through hole 309 may be arranged in the mid-portion of the speaker unit 300. Correspondingly, through holes (not shown) may also be arranged in the corresponding positions of the frame body 200, so that the connection between the speaker unit 300 and the frame body 200 is stable.

[0043] The frame body 200 may include a side wall 210, a top wall 220, and a bottom wall 230. The side wall 210 may be ring-shaped and disposed around the outer periphery of the speaker unit 300. Furthermore, 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.

[0044] The outer periphery of the frame body 200 may include a second mounting surface 211, which may be configured to mount the speaker module 10 to a predetermined mounting position. The second mounting surface 211 may be disposed on the outer periphery of the side wall 210 of the frame body 200. 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 the surface of the second mounting surface that has a larger area. The main plane of the second mounting surface 211 of the speaker module 10 shown in FIGS. 1 and 2 may be the xy plane shown in the figures. When the speaker module 10 is mounted to a predetermined mounting position, the second mounting surface 211 may be parallel to the mounting position so that the connection between the second mounting surface 211 and the predetermined mounting position is stable. The second mounting surface 211 may include mounting holes 2111. There may be at least three mounting holes 2111, and the mounting holes 2111 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 attached to a predetermined mounting position of the speaker module 10 in a screw-fastened manner. The predetermined mounting position of the speaker module 10 may be an infinite baffle within the vehicle cabin, and may be a location such as the inner sheet metal of a vehicle door, a trim panel, a floor, or a ceiling.

[0045] In the embodiments of this application, two mechanical parts being parallel to each other may mean that the two mechanical parts are approximately parallel rather than completely parallel. As can be understood by those skilled in the art, a certain tilt angle is allowed for two parallel mechanical parts due to manufacturing errors. For example, when the included angle between the two mechanical parts is 10° or less, the two mechanical parts may be considered to be parallel. Similarly, two perpendicular mechanical parts may be considered to be approximately perpendicular to each other.

[0046] The bottom wall 230 can extend from the position of the first mounting surface 310 of the speaker unit 300 to the front portion of the speaker unit, i.e., can extend from the first mounting surface 310 of the speaker unit 300 in the negative direction of the y-axis, and is attached to the side wall 210. The bottom wall 230 can be attached to the inner periphery of the side wall 210, or can be attached to the lower end of the side wall 210.

[0047] The shape of the bottom wall 230 can be wedge-shaped, square, arc-shaped, flat, irregular, etc. This is not a limitation in this application.

[0048] The frame body 200 and the surface of the diaphragm 302 of the speaker unit 300 that is closer to the first mounting surface 310 can form a first cavity 240. The first cavity 240 is a space formed by the bottom wall 230, the side wall 210, and the surface of the diaphragm 302 that is closer to the first mounting surface 310. The first cavity 240 can also be referred to as the front cavity of the speaker module 10, and the surface of the diaphragm 302 that is closer to 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.

[0049] The side of the frame body 200 closer to the first mounting surface 310 of the speaker unit 300 may include an open surface 241, or a portion of the frame body 200 located at the front portion of the speaker unit 300 may include an open surface. 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 mean that the side of the frame body 200 closer to the first mounting surface 310 of the speaker unit 300 is not completely closed, allowing sound generated by the speaker unit 300 to be transmitted to the outside of the frame body 200 through the first open surface 241. For example, in the speaker module shown in the figures, a certain gap exists between the front portion of the speaker unit 300 and the side wall 210, and the top wall 220 is not connected to the side wall 210, resulting in the first open surface 241 being formed at the upper end of the side wall 210. When the plane on which 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 can also be parallel to the main plane of the second mounting surface 211. The first open surface is formed in the frame body 200, and therefore the first cavity 240 is an open cavity. Then, sound waves generated by vibration of the diaphragm 302 of the speaker unit 300 can be radiated to the outside through the first open surface 241.

[0050] The volume of the first cavity 240 may be 0.1 liters (L) or greater. 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.

[0051] The volume of the first cavity 240 may 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 4 or more. For example, the acoustic cutoff frequency of the speaker module 10 may be 4, 4.5, or 5.5 times the resonant frequency of the speaker module 10 so that the operating band of the speaker module is wide. This ensures the acoustic performance of the speaker module 10. The acoustic cutoff frequency may refer to a specific frequency at which signals begin to stop passing through the system.

[0052] 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 higher than the cutoff frequency, the electro-acoustic conversion efficiency of the speaker module 10 gradually decreases. Therefore, based on the structural design of the first cavity 240, for example, by setting a large volume for the first cavity 240, the acoustic cutoff frequency of the speaker module 10 can be made higher than the upper limit of the operating frequency, so that the speaker module has a wide operating band and high electro-acoustic conversion efficiency. Thus, the acoustic performance of the speaker module 10 is ensured.

[0053] The top wall 220 can be disposed above the second mounting surface 211, and at least a portion of the top wall 220 can be attached to the side wall 210. "Above the second mounting surface 211" can mean that the top wall 220 is above the second mounting surface 211 in the z-axis direction shown in the figure. The top wall 220 can extend rearward from the position of the first mounting surface 310 of the speaker unit 300 to the tail portion of the speaker unit 300, and is connected to the side wall 210 located at the tail portion of the speaker unit 300. The portion of the top wall 220 connected to the side wall 210 may be connected to the inner periphery of the side wall 210, or may be connected to the top of the side wall 210. If the entire speaker unit 300 has a substantially tapered structure, the tail portion of the speaker unit 300 is the end of the speaker unit 300 that has a smaller radial size. Alternatively, the top wall 220 may continue to extend forward from the first mounting surface 310, i.e., in the negative direction of the y-axis shown in FIG. 1, provided that the top wall 220 is not completely connected to the side wall 210 located at the forward end of the first mounting surface 310 and a first open surface 241 is formed.

[0054] Some of the through holes 221 described above may be located on the top wall 220 close to the first mounting surface 310, for example, on the left and right sides of the top wall 220, and may be fastened to the two through holes 308 on the upper side of the first mounting surface 310, respectively, so that the frame body 200 can be attached to the speaker unit 300. The shape of the portion of the top wall 220 close to the first mounting surface 310 of the speaker unit 300 may be the same as the shape of the first mounting surface 310 so that the top wall 220 can be attached to the outer periphery of the first mounting surface 310 to form a sealed surface. The appearance of the top wall 220 may be similar to that of the speaker unit 300, and a wedge surface may be formed on the upper part so that the speaker module 10 can avoid other components in the installation scenario when installed in a predetermined installation position, thereby reducing the volume of the speaker module 10. The top wall 330 may alternatively be square, arc-shaped, flat, irregularly shaped, etc. This is not a limitation of this application.

[0055] The frame body 200 and the surface of the diaphragm 302 of the speaker unit 300 that does not face the first mounting surface 310 may form a second cavity 250, i.e., a space formed by the side wall 210, the top wall 220, and the surface of the diaphragm 302 that does not face the first mounting surface 310. The second cavity 250 may also be referred to as a rear cavity of the speaker module 10, and the surface of the diaphragm 302 that does not face the first mounting surface 310 may also be referred to as a rear portion of the diaphragm 302. Because the tail portion of the speaker unit 300 has a smaller radial size than the radial size of the head portion, there may be a certain gap between the tail portion of the speaker unit 300 and the side wall 210. In other words, a second open surface 251 may be formed between the tail portion of the speaker unit 300 and the side wall 210. The second open surface 251 may also be referred to as the opening 251. The opening 251 allows the second cavity 250 to be an open cavity, and the opening direction of the opening 251 can be perpendicular to the main plane of the second mounting surface 211. In this way, the speaker module 10 can radiate sound waves outward in the opening direction, i.e., can propagate sound wave energy outward in the negative direction of the z-axis shown in the figure.

[0056] The bottom wall 230 of the speaker module 10 may instead continue to extend from the position where it is connected to the first mounting surface 310 of the speaker unit 300 to the rear of the speaker unit 300, i.e., continue to extend in the positive direction of the y-axis shown in the figure, provided that at least a portion of the bottom wall 230 is not connected to the side wall 210 located at the rear of the speaker unit 300 and an opening 251 is formed at the rear of the speaker unit 300.

[0057] The bottom wall 230 of the frame body 200 can be disposed below the second mounting surface 211. "Below the second mounting surface 211" means that the bottom wall 230 is below the second mounting surface 211 in the z-axis direction shown in the figure. Some of the through holes 221 described above may instead be disposed on the bottom wall 230 close to the first mounting surface 310 of the speaker unit 300. For example, some of the through holes 221 may be disposed on the left and right sides of the bottom wall 230 and fastened to two through holes 308 on the underside of the first mounting surface 310, respectively, thereby attaching the frame body 200 to the speaker unit 300. A sealed surface may be formed at the position where the bottom wall 230 is connected to the first mounting surface 310. For example, the shape of the portion of the bottom wall 230 adjacent to 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 be separately attached to the top wall 220 and the side wall 210 of the frame body 200. Thus, the connection surface between the speaker unit 300 and the frame body 200 is a sealing surface. Furthermore, the inner diameter of the side wall 210 can also be the same as the radial size of the speaker unit 300, so that a sealing surface is formed where the entire frame body 200 is connected to the first mounting surface 310. The sealing surface formed where the frame body 200 is connected to the speaker unit 300 can isolate the front and rear cavities of the speaker unit 300, preventing mutual cancellation between the front and rear sound waves. This improves the efficiency of sound wave radiation toward the first cavity 240.

[0058] The top wall 220, side wall 210, and bottom wall 230 may form a unitary structure or may be multiple parts fastened together, such as by welding.

[0059] It should be noted that the term "same" in the embodiments of this application does not mean that the sizes are completely the same. As can be understood by those skilled in the art, the "same" size of two mechanical parts may have a certain range of variation, for example, a difference of 0.1 mm to 0.5 mm, since those skilled in the art can appropriately adjust the sizes of the mechanical parts based on design requirements.

[0060] In some embodiments, the speaker module 10 may further include a first sub-cavity 231. The first sub-cavity 231 may be disposed on the outer periphery of the frame body 200, and the first sub-cavity 231 may be in communication with the first cavity 240. The first sub-cavity 231 may also be referred to as a branch cavity. See the structure shown in FIG. 3. For example, the structure shown in FIG. 3 may be a cross-sectional structure of the speaker module 10 taken along the yz plane. The branch cavity 231 may be disposed on the outer periphery of the bottom wall 230. The bottom wall 230 may also have a through-hole 232 so that the branch cavity 231 is in communication with the first cavity 240. There may be multiple branch cavities 231. The multiple branch cavities 231 may be disposed at different positions on the bottom wall 230, and the multiple branch cavities 231 may be in communication with the first cavity 240. The resonant frequencies of the multiple branch cavities 231 may be different from each other.

[0061] The first sub-cavity 231 may instead be located inside the frame body 200 (not shown). For example, the first sub-cavity 231 may be located on the speaker unit 300 away from the first mounting surface 310 and may be located below the top wall 220. The frame body 200 may include a hole where it connects to the first mounting surface 310 of the speaker unit 300 so that the first sub-cavity 231 communicates with the first cavity 240.

[0062] 4 is a diagram showing the acoustic effect when the branch cavity 231 is disposed and the acoustic effect when the branch cavity 231 is not disposed according to an embodiment of the present application. The abscissa is the sound frequency (unit: Hz), and the ordinate is the acoustic transfer function amplitude value (unit: dB). Disposing the branch cavity can suppress the resonance peak of the first cavity 240 of the speaker module 10 and widen the bandwidth, which ensures the acoustic performance of the speaker module 10.

[0063] In some embodiments, the surface of the second mounting surface 211 closer to the predetermined 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. For the location of the shock absorbing pad 2113, please refer to the structure shown in Figure 5. In Figure 5, an example in which the inner metal sheet 41 of a vehicle door is used as the predetermined mounting position is used for explanation.

[0064] In one example, as shown in FIG. 5( a), the shock absorbing pad 2113 can be disposed between the second mounting surface 211 and a predetermined mounting position, for example, between the second mounting surface 211 and the inner sheet metal of a vehicle door, and is configured to reduce transmission of sound wave energy generated by the speaker module 10 in a normal direction of the predetermined mounting position, reduce vibration of the predetermined mounting position in the normal direction, and further reduce noise. The shock absorbing pad 2113 can be ring-shaped. The ring-shaped shock absorbing pad 2113 can have the same shape as the second mounting surface 211 and be disposed entirely below the second mounting surface 211. The shock absorbing pad 2113 can also be parallel to the main plane of the second mounting surface 211. Corresponding holes (not shown) are present on the shock absorbing pad 2113 at positions corresponding to the mounting holes 2111, so that screws can pass through the mounting holes 2111 and connect the predetermined mounting positions by screwing.

[0065] 5(b), the main plane of the impact absorbing pad 2113 may be perpendicular to the main plane of the second mounting surface 211, i.e., perpendicular to the inner metal sheet 41 of the vehicle door. The impact absorbing pad 2113 may also have a ring-shaped structure, and the main plane of the impact absorbing pad 2113 may be attached to the side wall 210 of the speaker module 10. When the speaker module 10 is attached to the inner metal sheet 41 of the vehicle door, the impact absorbing pad 2113 may be located between the inner metal sheet 41 of the vehicle door and the side wall 210 of the speaker module 10.

[0066] The speaker module 10 may include one shock absorbing pad 2113, or may include multiple shock absorbing pads 2113. For example, the shock absorbing pad 2113 may be disposed at the position shown in Fig. 5(a), or the shock absorbing pad 2113 may be disposed at the position shown in Fig. 5(b).

[0067] The second mounting surface 211 may further include a support component 2112, which may be arranged on a side of the second mounting surface 211 that does not face the predetermined mounting position, for example, may be arranged on an upper side of the second mounting surface 211 in the z-axis direction shown in the figure. The support component 2112 may be perpendicular to the main plane of the second mounting surface 211 and fixed to the side wall. The support component 2112 may be arranged over the entire second mounting surface 211. The support component 2112 may stabilize the connection between the second mounting surface 211 and the side wall, thereby stabilizing the connection between the speaker module 10 and the predetermined mounting position.

[0068] In some embodiments, the included angle between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 can be in the range of -30° to 30°, and the included angle between the sound output direction of the first cavity 240 and the plane in which the first mounting surface 310 is located can be in the range of -30° to 30°.

[0069] See FIG. 6 for an illustration of mounting the speaker module at a predetermined mounting position. For example, the speaker unit 300 can be mounted at a position close to the inside of the vehicle cabin, e.g., at the vehicle door. That is, the predetermined mounting position can be located at the vehicle door. Additionally, the predetermined mounting position can be located on the inner metal sheet 41 of the vehicle door. The predetermined mounting position can be a part of the inner metal sheet 41 of the vehicle door, e.g., a part that directly contacts the second mounting surface 211 of the speaker module. The inner metal sheet 41 of the vehicle door can include a mounting hole, and the speaker module 10 can be embedded in the mounting hole and mounted to the inner metal sheet 41 of the vehicle door through the mounting hole. When the speaker module is mounted at the predetermined mounting position, the main plane of the second mounting surface 211 of the speaker module can be parallel to the main plane of the predetermined mounting position, and the main plane of the predetermined mounting position can be parallel to the plane of the vehicle door. The plane of the vehicle door can be the plane on which the inner metal sheet 41 of the vehicle door is located. In an actual product, the vehicle door inner metal sheet 41 may have an irregular shape, for example, may include protrusions and recesses. The plane on which the vehicle door inner metal sheet 41 is located may be a plane with a larger flat area on the vehicle door inner metal sheet 41, and the speaker module is attached to that flat portion of the vehicle door inner metal sheet 41, thereby stabilizing the connection between the speaker module and the vehicle door inner metal sheet.

[0070] The vehicle door may further include an outer wall. The outer wall may be an outer sheet metal 43 of the vehicle door. An inner sheet metal space 42 may be formed between the inner sheet metal 41 of the vehicle door and the outer sheet metal 43 of the vehicle door. The inner sheet metal space 42 may be hollow and have a specific volume. At least a portion of the speaker module 10 may be accommodated in this accommodation space. The opening 251 of the speaker module 10 may face the inner sheet metal space 42. When the speaker module 10 is mounted in a predetermined mounting position, the speaker module 10 and the accommodation space at the predetermined mounting position may form a closed space. The speaker module 10 may radiate sound waves into the inner sheet metal space 42 to eliminate sound waves propagated by the speaker module 10 in the direction of the second cavity 250 and ensure that sound waves are propagated in the direction of the first cavity 240.

[0071] The included 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 mounting structure diagram shown in FIG. 6(a), the included 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 the mounting structure diagram may be the speaker module 10 shown in FIGS. 1 and 2. Alternatively, the speaker unit 300 may be tilted within the frame body 200, i.e., α may not be 0°. When α is a negative value, the opening direction of the speaker unit 300 may face the inside of the space enclosed by the frame body 200, i.e., it may face the direction of the storage space outside the cabin, as shown in FIG. 6(b). When α is a positive value, the opening direction of the speaker unit 300 can face the outside of the space enclosed by the frame body 200, i.e., not toward the storage space outside the cabin, as shown in FIG. 6(c). The speaker unit 300 can be fixed to the frame body 200 in a structural relationship in which the included angle between the axial direction of the speaker unit 300 and the second mounting surface 211 is in the range of −30° to 30°. Alternatively, the speaker unit 300 can be rotatably connected to the frame body 200 so that the included 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, a tail portion of the speaker unit 300 can be rotatably connected to the frame body 200.

[0072] The narrow angle range β between the sound output direction of the speaker module 10 or the sound output direction of the first cavity 240 and the plane on which the first mounting surface 310 of the speaker unit 300 is located can range from -30° to 30°. The first mounting surface 310 of the speaker unit 300 can be a ring-shaped structure. The plane on which the first mounting surface 310 is located is the plane on which the ring-shaped structure is located. In the speaker module 10 shown in FIGS. 1 to 3 , the plane on which the first mounting surface 310 is located can be parallel to the xz plane. The sound output direction of the speaker module 10 can be the main sound output direction of the speaker module, or the direction of maximum sound wave energy radiated by the speaker unit 300. In the structure shown in FIGS. 1 to 3 , the sound output direction of the speaker module 10 can be perpendicular to the main plane of the second mounting surface 211. In other words, the sound output direction of the speaker module 10 may be perpendicular to the direction of the plane enclosed by the upper end of the side wall 210, i.e., perpendicular to the plane on which the open surface 241 is located. See the arrow directions shown in FIG. 2 or 3. Specifically, when the speaker module 10 is mounted according to the structure shown in FIG. 6(a), sound waves generated by the speaker unit 300 may first propagate in the axial direction of the speaker unit 300. After reaching the frame body 200, for example, the bottom wall 220, the sound output direction changes and propagates toward the outside of the frame body 200. The sound output direction of the speaker module 10 or the sound output direction of the first cavity 240 may be the final sound output direction to which the sound waves change after reaching the frame body 200. In the structure shown in FIG. 6(a), the included angle between the sound output direction of the speaker module 10 and the plane on which the first mounting surface 310 is located may be 0°. Similarly, when the speaker module 10 is mounted according to the structure shown in Fig. 6(b), the included angle between the sound output direction of the speaker module 10 and the plane on which the first mounting surface 310 is located can be a negative value, such as -30°. When the speaker module 10 is mounted according to the structure shown in Fig. 6(c), the included angle between the sound output direction of the speaker module 10 and the plane on which the first mounting surface 310 is located can be a positive value, such as 30°.

[0073] As shown in FIG. 6(d), when the opening direction of the speaker unit 300 faces directly toward the inside of the cockpit, i.e., when 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 on which the first mounting surface 310 is located, the sound wave energy generated by the speaker unit 300 can be propagated directly into the cabin in the z-axis direction shown in FIG. 6, for example, in the direction indicated by the solid arrow in FIG. 6(d). The tangential stiffness of the second mounting surface 211 is much higher than its stiffness in the normal direction. In other words, the stiffness of the inner sheet metal 41 of the vehicle door in the y-axis direction shown in the figure is much higher than its stiffness in the z-axis direction. Lower stiffness indicates a higher likelihood of vibration due to force. When sound wave energy propagates in the z-axis direction, the force on the inner sheet metal of the vehicle door also flows in the z-axis direction, i.e., in the direction indicated by the dashed arrow in the figure. As a result, the inner metal plate 41 of the vehicle door easily vibrates in the z-axis direction, which further generates abnormal noise and affects the sound quality of the speaker module 10.

[0074] In the speaker module 10 provided in the embodiment of this application, the included angle between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 ranges from -30° to 30°. Furthermore, the included angle between the sound output direction of the first cavity 240 and the plane on which the first mounting surface 310 of the speaker unit 300 is located can range from -30° to 30°. This effectively reduces sound energy transmitted in the normal direction of the second mounting surface 211. This effectively reduces vibrations at the inner metal sheet 41 of the vehicle door and the connection position of the inner metal sheet 41 of the vehicle door in the normal direction of the second mounting surface 211, reduces noise generated by the operation of the speaker module 10, and improves the sound quality of the speaker module 10.

[0075] For example, the narrow angle between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 can be in a range of ±30°, ±25°, ±20°, ±15°, ±10°, or ±5°, etc., and the narrow angle between the sound output direction of the first cavity 240 and the plane on which the first mounting surface 310 of the speaker unit 300 is located can be in a range of ±30°, ±25°, ±20°, ±15°, ±10°, or ±5°, etc.

[0076] FIG. 7 is a diagram of a comparison between the acceleration effect at different mounting angles according to one embodiment of the present application. The higher the acceleration level, the stronger the vibration at the mounting position. As shown in FIG. 7, when the mounting is forward-facing, i.e., when the narrow 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 188 dB. When the narrow angle between the axial direction of the speaker unit 300 and the second mounting surface 211 is 0°, the average acceleration level at the mounting position is 155 dB. When the narrow 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 167 dB. When the narrow 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 176 dB. 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 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 an obvious 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 continuously decreases, and the vibration at the mounting position gradually slows down.

[0077] In some embodiments, the ratio of the maximum distance from the frame body portion corresponding to the first cavity 240 to the main plane of the second mounting surface 211 to the size of the speaker module 10 in a direction perpendicular to the main plane of the second mounting surface 211 ranges from 1 / 4 to 3 / 4. When the speaker module 10 is mounted to a predetermined mounting position, the frame body portion corresponding to the first cavity 240 can be accommodated in an accommodating space 42 formed at the predetermined mounting position. The maximum distance from the frame body portion corresponding to the first cavity 240 to the main plane of the second mounting surface 211 is the accommodating depth of the speaker module 10 within the accommodating space at the predetermined mounting position, or is referred to as the mounting depth of the second mounting surface. As shown in FIGS. 6(a) to 6(c), the predetermined mounting position can be an inner sheet metal 41 of a vehicle door, and a specific accommodating space can be formed between the inner sheet metal 41 of the vehicle door and an outer sheet metal 43 of the vehicle door, where the outer sheet metal 43 of the vehicle door is the exterior wall of the vehicle. The maximum distance from the frame body portion corresponding to the first cavity 240 to the main plane of the second mounting surface 211 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 two distances. One is the distance from the end of the portion of the speaker module 10 inside the accommodation space that is farthest from the main plane of the second mounting surface 211 to the main plane of the second mounting surface 211. The other is the distance from the end of the portion of the speaker module 10 located outside the accommodation space that is farthest from the main plane of the second mounting surface 211 to the main plane of the second mounting surface 211. In other words, the above sum 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 referred to as the height of the speaker module 10. By setting the ratio of the mounting 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 mounting surface 211 to be in the range of 1 / 4 to 3 / 4, the torque between the speaker module 10 and the mounting position can be reduced, and vibration at the mounting position of the speaker module can be reduced.

[0078] 8 is a comparison diagram between the acceleration effects corresponding to different mounting depths at the mounting position according to one embodiment of the present application. As shown in FIG. 8, when the mounting depth of the speaker module is 0, that is, when the speaker module is mounted on the surface of the mounting position and not in the accommodation space, the average acceleration level at the mounting position is 118.5 dB. When the ratio of the mounting depth to the height of the speaker module is 1 / 4, the average acceleration level at the mounting position is 111.5 dB. When the ratio of the mounting depth to the height of the speaker module is 3 / 4, the average acceleration level at the mounting position is 111.5 dB. When the mounting depth is 1 / 2, the average acceleration level at the mounting position is 105.7 dB. It can be seen that when the ratio of the mounting depth to the height of the speaker module increases from 0 to 1 / 4, the average acceleration level at the mounting position has an obvious gain, and the vibration at the mounting position is significantly reduced.

[0079] Please refer to the mounting structure diagram shown in FIG. 6 . An inner vehicle door metal sheet 41 and an outer vehicle door metal sheet 43 may form an accommodating space 42. When the speaker module 10 is mounted to the inner vehicle door metal sheet 41, the frame body portion corresponding to the first cavity 240 may pass through the mounting hole in the inner vehicle door metal sheet 41 and be accommodated in the accommodating space 42. In addition, when the speaker module is mounted to the inner vehicle door metal sheet, the opening 251 of the speaker module may communicate with the accommodating space 42. A sealing surface may be formed where the second mounting surface 211 of the speaker module 10 is connected to the inner vehicle door metal sheet 41, and a sealing surface may be formed where the speaker unit 300 is connected to the frame body 200. The opening 251 allows the second cavity 250 of the speaker module 10 and the accommodating space 42 to form a closed cavity together. The closed cavity can be isolated from the first cavity 240, thereby eliminating sound waves propagated by the speaker module 10 to the side where the second cavity 250 is located, and improving the sound output effect on the side of the first cavity 240.

[0080] The ratio of the volume of the second cavity 250 to the volume of the closed cavity may be 1 / 10 or less. For example, to further improve the bass effect of the first cavity 250, the volume of the closed cavity may be 10 times, 15 times, 20 times, or 25 times the volume of the second cavity 250, etc.

[0081] FIG. 9 is a diagram of another mounting structure according to an embodiment of the present application. This diagram of the mounting structure may be a top view of the speaker module 10, i.e., a view of the overall structure corresponding to the speaker module 10 viewed in a direction perpendicular to the plane of the vehicle door. When the speaker module 10 is mounted on the inner metal sheet 41 of the vehicle door, the plane on which the first mounting surface 310 of the speaker unit 300 is located may be parallel to the lower contour of the inner metal sheet 41 of the vehicle door, in other words, parallel to the ground, i.e., parallel to the x-axis direction shown in the figure. FIG. 9 illustrates the angular relationship between the bottom of the inner metal sheet 41 of the vehicle door and the dashed line. In addition, as shown in FIG. 9(a), the sound outlet of the speaker module 10 is located in the upper half of the speaker module 10. In other words, the first open surface 241 of the speaker module 10 is located in the upper half of the speaker module 10, i.e., the portion of the speaker module 10 away from the ground. 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 on which the first mounting surface 310 of the speaker unit 300 is located may instead be tilted, in which case there is a narrow angle between the plane on which the first mounting surface 310 is located and the lower contour of the inner sheet metal 41 of the vehicle door. For example, this narrow angle may be 10°, 20°, 30°, 40°, 50°, 60°, 70°, or 80°, so that the sound outlet of the speaker module 10 is located on the right side of the speaker module as shown in FIG. 9(b), or the sound outlet of the speaker module 10 may be located on the left side of the speaker module 10 (not shown). The plane on which the first mounting surface 310 of the speaker unit 300 is located may alternatively be perpendicular to the lower contour of the inner sheet metal 41 of the vehicle door so that the sound outlet of the speaker module 10 is located on the right side of the speaker module as shown in FIG. 9(c), or the sound outlet of the speaker module 10 may be located on the left side of the speaker module 10 (not shown).

[0082] 9 is used merely as an example of mounting the speaker module 10 to a mounting position, and the mounting position of the speaker module 10 should not be limited. The speaker module 10 may be mounted to the mounting position at any angle, i.e., any narrow angle may exist between the first mounting surface 310 and the bottom contour of the inner metal sheet 41 of the vehicle door, and the speaker module 10 may be disposed at any position on the inner metal sheet 41 of the vehicle door, for example, at the bottom, top, left side, or right side of the inner metal sheet 41 of the vehicle door.

[0083] 9 can be considered to be a diagram of a mounting structure corresponding to the case where the plane on which first mounting surface 310 is located is perpendicular to second mounting surface 211, in other words, a diagram of a mounting structure corresponding to the case where the axial direction of speaker unit 300 is parallel to the main plane of second mounting surface 211. When the axial direction of speaker unit 300 and the main plane of second mounting surface 211 are in the narrow angle relationship described above, first mounting surface 310 and the bottom contour of inner sheet metal 41 of the vehicle door can also be in the narrow angle relationship described above, and the sound outlet of speaker module 10 can be located on the upper side, lower side, left side, right side, etc. of speaker module 10.

[0084] The circuit diagram shown in FIG. 10 is an acoustically analogous equivalent circuit diagram of the speaker module 10 according to one embodiment of the present application. The power source P corresponds to the magnetic circuit system 305 in the speaker unit 300. When the magnetic circuit system 305 is powered on, the generated magnetic force can drive the vibration system to vibrate. The resistor Ras can correspond to the DC resistance of the voice coil 306 of the speaker unit 300. The capacitor Cas and the inductor Mas can correspond to the equivalent compliance and quality 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 form the speaker unit 300. The capacitor Cab can correspond to the rear cavity of the speaker module 10. The lower half of the acoustically analogous equivalent circuit diagram, including the capacitor Caf, the resistor Raf, and the inductor Maf, can correspond to the front cavity of the speaker module 10. The current direction shown in the diagram is the flow of volume velocity. There may be a particular volume velocity in both the front and rear cavities of the speaker module, and the vibration velocity in the front and rear cavities may be the same.

[0085] In some embodiments, multiple speaker units 300 may be present, and the multiple speaker units 300 may form a symmetrical structure. For example, FIG. 11 is a cross-sectional view of another speaker module according to an embodiment of the present application. As shown in FIG. 11, two speaker units 300 may be present, and the two speaker units 300 may be arranged opposite each other to form an axisymmetrical structure. Correspondingly, multiple frame bodies 200 may also be present, and the number of frame bodies 200 may be the same as the number of speaker units 300. For example, if there are two speaker units 300, there may also be two frame bodies 200. Thus, the multiple speaker units 300 can be housed in their corresponding frame bodies 200. The two speaker units 300 and the corresponding frame bodies 200 may form independent speaker modules, i.e., two speaker modules. The two speaker modules are arranged opposite each other and separately mounted at predetermined mounting positions. Two speaker units 300 and corresponding frame bodies 200 may also form one speaker module, i.e., the two frame bodies 200 may be fastened together or form a single structure. For example, two frame bodies 200 may share a side wall to form one frame body 200. Arranging multiple speaker units 300 to form a symmetrical structure can further reduce vibrations generated at the mounting position, increase the sound pressure of the speaker module, and improve sound production performance.

[0086] The speaker module provided in the embodiments of this application may be a bass speaker module, and the operating frequency of the speaker module may be below 80 Hz.

[0087] One embodiment of this application further provides a vehicle. The vehicle may include any of the speaker modules 10 described in FIGS. 1-9. The speaker module 10 may be attached to a vehicle door, for example, to the inner sheet metal of the vehicle door described above. Alternatively, the speaker module may be attached to a location inside the vehicle, such as a trim panel, floor, or ceiling. As described above, the example in which the attachment location is the inner sheet metal of the vehicle door is used. The inner sheet metal of the vehicle door and the outer sheet metal of the vehicle door may form an accommodating space. When the speaker module is attached to the inner sheet metal of the vehicle door, the frame body portion corresponding to the first cavity may pass through the mounting hole and be accommodated in the accommodating space. Additionally, when the speaker module is attached to the inner sheet metal of the vehicle door, the opening 251 of the speaker module may communicate with the accommodating space. In this case, the second open surface 251 allows the second cavity 250 and the accommodating space 42 to form a closed cavity together. The closed cavity is isolated from the first cavity 240 to eliminate the sound waves propagated by the speaker module to the side where the second cavity is located, and improve the sound output effect on the side of the first cavity 240. To further improve the bass effect of the first cavity 240, the ratio of the volume of the second cavity 250 to the volume of the closed cavity can be 1 / 10 or less.

[0088] It should be noted that the speaker module can also be mounted at another predetermined mounting position inside the vehicle, as long as a sealed space can be formed between the predetermined mounting position and the speaker module. Similarly, the speaker module may alternatively be disposed on the outside of the vehicle, or may be disposed at another location, such as a wall or a sound box, that can form a sealed space together with the speaker module. The application scenario and predetermined mounting position of the speaker module are not limited in this application.

[0089] The above description is merely a specific implementation of this application, and the scope of protection of this application is not limited thereto. Any variations or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed in this application shall fall within the scope of protection of this application. Therefore, the scope of protection of this application shall be governed by the scope of protection of the claims.

Claims

1. A speaker module having a speaker unit and a frame body, the speaker unit being disposed within the frame body, the speaker unit having a first mounting surface, the first mounting surface being located at an end of the speaker unit having a larger radial size, the speaker unit being attached to the frame body via the first mounting surface; the speaker unit further includes a diaphragm, the diaphragm being disposed around the inner periphery of the speaker unit, the frame body and a surface of the diaphragm closer to the first mounting surface forming a first cavity, and an included angle between a sound output direction of the first cavity and a plane on which the first mounting surface is located is in the range of −30° to 30°; an outer periphery of the frame body has a second mounting surface, the second mounting surface is configured to mount the speaker module at a predetermined mounting position, a main plane of the second mounting surface is parallel to a main plane of the predetermined mounting position, and an included angle between an axial direction of the speaker unit and the main plane of the second mounting surface is in a range of −30° to 30°; Speaker module.

2. 2. The speaker module of claim 1, wherein the frame body and a surface of the diaphragm not facing the first mounting surface can form a second cavity, the second cavity and the first cavity being respectively disposed on either side of the second mounting surface in a direction perpendicular to the main plane of the second mounting surface, the frame body having an opening such that the second cavity is an open cavity, and the opening direction of the opening is perpendicular to the main plane of the second mounting surface.

3. 3. The speaker module of claim 2, wherein a sealing surface is formed between the first mounting surface and the frame body such that the first cavity is isolated from the second cavity.

4. 4. A speaker module according to claim 1, wherein a ratio of a maximum distance from a frame body portion corresponding to the first cavity to the main plane of the second mounting surface to a 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.

5. 5. The speaker module according to claim 1, wherein the first cavity has a volume of 0.1 liters or more.

6. 6. The speaker module according to claim 5, wherein a ratio of an acoustic cutoff frequency of the speaker module to a resonant frequency of the speaker module is 4 or greater.

7. 7. A speaker module according to claim 1, further comprising at least one first sub-cavity, the at least one first sub-cavity communicating with the first cavity.

8. 8. The speaker module according to claim 1, wherein a surface of the second mounting surface closer to the predetermined mounting position has a shock absorbing pad.

9. 9. A speaker module according to claim 1, wherein the second mounting surface has mounting holes, and there are at least three mounting holes, and the mounting holes penetrate the second mounting surface in a direction perpendicular to the second mounting surface.

10. 10. The speaker module according to claim 1, wherein there are a plurality of speaker units forming a symmetrical structure, and the first mounting surfaces of the plurality of speaker units are adjacent to each other.

11. 11. The speaker module according to claim 10, wherein there are a plurality of frame bodies, the number of which is the same as the number of speaker units, and the plurality of speaker units are housed in corresponding frame bodies, respectively.

12. 12. A vehicle having the speaker module according to claim 1, wherein the vehicle has a vehicle door, the predetermined mounting position is located on the vehicle door, and the main plane of the predetermined mounting position is parallel to a plane direction of the vehicle door.

13. The vehicle further has an outer wall, and the outer wall and the predetermined mounting position form an accommodation space; 13. The vehicle according to claim 12, wherein when the speaker module is attached to the predetermined attachment position, the frame body portion corresponding to the first cavity is positioned within the storage space, the opening communicates with the storage space, and the second cavity and the storage space form a closed cavity.

14. 14. The vehicle of claim 13, wherein the ratio of the volume of the second cavity to the volume of the closed cavity is 1 / 10 or less.

Images