Speaker module and vehicle
The speaker module design addresses vibrations and noise issues by using angled cavities and a shock-absorbing pad to isolate sound waves, enhancing sound quality and acoustic performance.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- YINWANG INTELLIGENT TECHNOLOGIES CO LTD
- Filing Date
- 2024-05-11
- Publication Date
- 2026-07-02
Smart Images
Figure 0007884095000001 
Figure 0007884095000002 
Figure 0007884095000003
Abstract
Description
Technical Field
[0001] This application claims priority to Chinese Patent Application No. 202311043580.8, filed on August 17, 2023, entitled "Speaker Module and Vehicle", which is hereby incorporated by reference in its entirety.
[0002] This application relates to the field of speaker technology, and more particularly, to speaker modules and vehicles.
Background Art
[0003] A speaker is an electroacoustic transducer that converts electrical energy into acoustic energy and radiates it into the far air. A moving coil type speaker usually consists of a support system, a magnetic circuit system, and a vibration system. The magnetic circuit system and the vibration system are the main parts for the conversion between electrical energy and acoustic energy. When the magnetic circuit system is powered on to generate a magnetic field, a force can be applied to the voice coil in the vibration system to drive the voice coil to vibrate. The voice coil drives the diaphragm to vibrate, and the diaphragm drives the air to vibrate, ultimately generating sound.
[0004] In the process where the alternating force exerted on the voice coil by the magnetic circuit system causes the voice coil to vibrate and radiate sound waves due to the interaction of forces, the magnetic circuit system receives a reaction force, causing vibration of the main body of the speaker unit or electroacoustic conversion components, etc. As a result, components such as the mounting surface of the speaker module vibrate and generate abnormal sounds, which greatly affects the sound quality of the speaker.
Summary of the Invention
[0005] This application provides a speaker module and a vehicle that can effectively reduce the vibrations generated at and near the mounting position of the speaker module during the operation of the speaker module, and improve the sound quality of the speaker module.
[0006] According to a first embodiment, a speaker module is provided, which includes 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 the end of the speaker unit having a larger radial size. The speaker unit is mounted to the frame body via the first mounting surface. The speaker unit further includes a diaphragm. The diaphragm is positioned around the inside of the speaker unit. The frame body and the surface of the diaphragm on the side closer to the first mounting surface form a first cavity. The narrow 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°. 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. The principal plane of the second mounting surface is parallel to the principal plane of the predetermined mounting position. The narrow 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 narrow angle between the axial direction of the speaker unit and the second mounting surface is in the range of -30° to 30°, and the narrow 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°. Thus, the sound wave energy transmitted in the direction perpendicular to the second mounting surface can be reduced, and as a result, vibrations generated at and near the mounting position of the speaker module during the operation of the speaker module can be reduced, noise generated by vibrations at the mounting position can be reduced, and the sound quality of the speaker module can be improved.
[0008] Referring to the first embodiment, in some implementations of the first embodiment, a second cavity can be formed between the frame body and the surface of the diaphragm not facing the first mounting surface. The second cavity and the first cavity are positioned on either side 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 this embodiment provided in this application, a second cavity is formed by the frame body and the diaphragm surface on the side not facing the first mounting surface, and the second cavity is an open cavity. After the speaker module is mounted in the mounting position, the open second cavity and the housing space of the mounting position form an infinite rear cavity, thereby eliminating sound waves radiated by the speaker module toward the second cavity and preventing sound waves radiated by the speaker module toward the second cavity from affecting sound waves radiated toward the first cavity. Thus, it is ensured that sound waves are radiated toward the first cavity.
[0010] Referring to the first embodiment, in some implementations of the first embodiment, 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 such that the first cavity is isolated from the second cavity. This prevents sound waves radiated by the speaker module toward the second cavity from affecting sound waves radiated toward the first cavity, thereby ensuring the sound generation performance of the first cavity.
[0012] Referring to the first embodiment, in some implementations of the first embodiment, 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 positioned in a mounting location, it can be ensured that the ratio of the mounting depth of the speaker module at a given mounting location 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, thereby reducing the torque between the speaker module and the given mounting location and reducing vibration at the mounting location during the operation of the speaker module.
[0014] Referring to the first embodiment, in a partial implementation of the first embodiment, the volume of the first cavity is 0.1 liters or more.
[0015] In this embodiment provided in this application, the volume of the first cavity is 0.1 liters or more, so that the acoustic cutoff frequency of the speaker module can be much higher than the resonant frequency of the speaker module. Thus, it is ensured that the speaker module has a wide operating bandwidth and that the acoustic performance of the speaker is ensured.
[0016] Referring to the first embodiment, in a partial implementation of the first embodiment, the ratio of the acoustic cutoff frequency of the speaker module to the resonant frequency of the speaker module is 4 or greater.
[0017] In this embodiment provided in this application, the volume design of the first cavity ensures that the ratio of the acoustic cutoff frequency of the speaker module to the resonant frequency of the speaker module is 4 or greater, thereby providing the speaker module with a wide operating bandwidth and ensuring the acoustic performance of the speaker module.
[0018] Referring to the first embodiment, in some implementations of the first embodiment, the speaker module further includes at least one first subcavity, the at least one first subcavity communicating with the first cavity.
[0019] In this embodiment provided in this application, the speaker module includes at least one first subcavity, the at least one first subcavity in communication with a first cavity, thereby reducing the resonance peak of the first cavity of the speaker module, widening the bandwidth, and improving the acoustic performance of the speaker module.
[0020] Referring to the first embodiment, in a partial implementation of the first embodiment, the surface of the second mounting surface closer to the predetermined mounting position includes an impact-absorbing pad.
[0021] In this embodiment provided in this application, the surface of the second mounting surface on the side closer to the predetermined mounting position includes a shock-absorbing pad. Thus, the sound wave energy transmitted in a direction perpendicular to the second mounting surface can be reduced, and as a result, vibrations generated at and near the mounting position of the speaker module during the operation of the speaker module can be reduced, preventing noise generated by vibrations at the mounting position from affecting the sound quality of the speaker module.
[0022] Referring to the first aspect, in some implementations of the first aspect, the second mounting surface includes mounting holes. There are at least three mounting holes. The mounting holes penetrate 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, as a result, the stability of the connection between the speaker module and a predetermined mounting position can be improved.
[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 form a symmetric structure, and the first mounting surfaces of the plurality of speaker units are close to each other.
[0025] In this embodiment provided in this application, the plurality of speaker units form a symmetric structure, and the first mounting surfaces of the plurality of speaker units are close to each other, as a result, 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] Referring 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 respectively accommodated in corresponding frame bodies.
[0027] According to the second aspect, a vehicle is provided. The vehicle includes a speaker module according to any one of the first aspect or possible implementations of the first aspect. The vehicle includes vehicle doors. The predetermined mounting position is located on the vehicle door. The main plane of the predetermined mounting position is 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 outer wall. An accommodation space is formed by the outer wall and the predetermined mounting position. When the speaker module is mounted at the predetermined mounting position, the frame body portion corresponding to the first cavity is located in the accommodation space. An opening communicates with the accommodation space. A closed cavity is formed by the second cavity and the accommodation space.
[0029] Referring to the second aspect, in some implementations of the second aspect, 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 attached to a predetermined attachment position, the opening allows the second cavity to communicate with the accommodation space formed at the attachment position, and by forming the closed cavity, the sound waves radiated by the speaker module in the direction of the second cavity are eliminated, 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, it is ensured 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 1 / 10 or less, and as a result, the sound generation performance of the first cavity of the speaker module can be further improved.
Brief Description of the Drawings
[0031] [Figure 1] It is a diagram of the three-dimensional structure of a speaker module according to an embodiment of this application. [Figure 2] It is a diagram of the cross-sectional structure of a speaker module according to an embodiment of this application. [Figure 3] It is a diagram of the cross-sectional structure of a speaker module according to an embodiment of this application. [Figure 4] It is a diagram of the acoustic effect of a speaker module according to an embodiment of this application. [Figure 5] It is a diagram of the attachment structure of a speaker module according to an embodiment of this application. [Figure 6] It is a diagram of the attachment structure of a speaker module according to an embodiment of this application. [Figure 7] It is a diagram of the comparison between the acceleration levels at the attachment position of a speaker module according to an embodiment of this application. [Figure 8] It is a diagram of the comparison between the acceleration levels at the attachment position of a speaker module according to an embodiment of this application. [Figure 9] This is a diagram of a speaker module mounting structure according to one embodiment of this application. [Figure 10] This is an acoustically analogous equivalent circuit diagram of a speaker module according to one embodiment of this application. [Figure 11] This is a diagram of the cross-sectional structure of another speaker module according to one embodiment of this application. [Modes for carrying out the invention]
[0032] The technical solution of this application will be described below with reference to the attached drawings.
[0033] References to “one embodiment” or “some embodiments” in this specification mean that one or more embodiments of this application include certain features, structures, or characteristics described in combination with that embodiment. Therefore, phrases such as “in one embodiment,” “in some embodiments,” “in some other embodiments,” and “in other embodiments,” which appear in various places in this specification, do not necessarily refer to the same embodiment. Rather, unless otherwise specifically emphasized, these phrases mean “one or more embodiments, not all of them.”
[0034] In embodiments of this application, “first,” “second,” etc., are merely intended to indicate that multiple subjects are different. For example, “first cavity” and “second cavity” are used simply to represent different cavities. These terms should not affect the cavities or their number. The aforementioned “first,” “second,” etc., should not impose any limitations on embodiments of this application.
[0035] The terms “include,” “contain,” “possess,” and variations thereof all mean “include, but not limited to,” unless otherwise specifically emphasized.
[0036] In embodiments of this application, unless otherwise specified, the number of nouns indicates “singular or plural nouns,” that is, “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 similar types.
[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 cross section AA of the structure shown in Figure 1.
[0038] Please refer to the structure 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 placed inside the frame body 200.
[0039] The speaker unit 300 as a whole can have a roughly tapered structure, and the speaker unit 300 may include structural components such as a basket 301, a magnetic circuit system 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 circuit system 305, voice coil 306, diaphragm 302, damper 307, surround 303, and dust cap 304 can be arranged inside the basket 301, and the basket 301 can have a roughly tapered structure. Typically, the material of the basket 301 may have characteristics such as being lightweight, resistant to deformation, and having good heat dissipation. For example, the material may be a metallic material.
[0040] The magnetic circuit system 305 may include a magnet, a soft magnetic material washer, and a yoke. The voice coil 306, diaphragm 302, and damper 307 are the main components of the vibration system. The voice coil 306 is formed by winding a wire around a pipe and may be placed within the magnetic clearance of the magnetic circuit system 305. The diaphragm 302 may be placed around the inner circumference of the speaker unit 300. In other words, the diaphragm 302 may be placed around the inner circumference 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 with a smaller radial size may be connected to the voice coil 306, and the end of the tapered diaphragm 302 with a larger radial size may be connected to the surround 303. The diaphragm 302 may instead have a planar or arc-shaped structure, and the material of the diaphragm 302 may be fiber, rubber, elastomer, or metal. When power is applied to the speaker unit 300, the magnetic circuit system 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, and the vibration of the diaphragm 302 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 be used to cap the end of the voice coil 306 away from the magnetic circuit system 305, thereby preventing dust from reaching the voice coil 306.
[0041] A damper 307 may be positioned 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 laterally. The axial direction of the speaker unit 300 is the direction of the y-axis as 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 fibrous material. The surround 303 may be of a ring-shaped structure. The surround 303 may be positioned at the larger radial end of the speaker unit 300 in the circumferential direction, 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 laterally. The surround 303 can be made of a material such as plastic, natural rubber, or paper, and is bonded to the diaphragm 302 by hot pressing. The damper 307 and the surround 303 work together to ensure that the diaphragm 302 and voice coil 306 move axially within a specific range.
[0042] The speaker unit 300 can be placed inside the frame body 200, and the speaker unit 300 may include a first mounting surface 310. The first mounting surface 310 can be located at the end of the speaker unit 300 with a larger radial size, and the first mounting surface 310 can be of a planar structure. In other words, the first mounting surface 310 can be parallel to the xz plane shown in the figure. Since the diaphragm 302 is located around the inside of the speaker unit 300, the first mounting surface 310 can 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 can be located closer to the origin of the y-axis than the diaphragm 302. The first mounting surface 310 can be attached to the frame body 200, for example, by screwing or gluing. 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 position of the frame body 200 corresponding to the through hole 221 may include one or more through holes 308, so that screws can pass through the through holes 308 and through holes 221 in sequence to attach the frame body 200 to the speaker unit 300. Through holes may also be located in the middle and tail portions of the speaker unit 300. For example, a through hole 309 may be located in the middle portion of the speaker unit 300. Correspondingly, through holes (not shown) may also be located at corresponding positions on 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 side walls 210, a top wall 220, and a bottom wall 230. The side walls 210 may be ring-shaped and positioned around the outer circumference of the speaker unit 300. Additionally, a portion of the side walls 210 may be located on the front side of the speaker unit 300, and a portion of the side walls 210 may be located on the rear side of the speaker unit 300.
[0044] The outer circumference 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 located on the outer circumference 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 larger surface of the second mounting surface. The main plane of the second mounting surface 211 of the speaker module 10 shown in Figures 1 and 2 may be the xy plane shown in the figures. 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 when the speaker module 10 is mounted to a predetermined mounting position. The second mounting surface 211 may include mounting holes 2111. At least three mounting holes 2111 may be present, 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 by screw fastening. The predetermined mounting position of the speaker module 10 may be an infinite baffle in the vehicle cabin, for example, a location such as the inner sheet metal of a vehicle door, a trim panel, the floor, or the ceiling.
[0045] In the embodiments of this application, the parallelism of two machine parts may mean that they are approximately parallel rather than perfectly parallel. As those skilled in the art will understand, certain angles of inclination are permissible for two parallel machine parts due to manufacturing tolerances. For example, two machine parts may be considered parallel when the narrow angle between them is 10° or less. Similarly, two perpendicular machine parts may 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, that is, it 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 circumference of the side wall 210, or to the lower end of the side wall 210.
[0047] The shape of the bottom wall 230 can be wedge-shaped, square, arc-shaped, planar, or irregular, and is not limited to this application.
[0048] A first cavity 240 can be formed by the frame body 200 and the surface of the diaphragm 302 of the speaker unit 300 on the side closer to the first mounting surface 310. The first cavity 240 is a space formed by the bottom wall 230, the side wall 210, and the surface of the diaphragm 302 on the side 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 of the speaker unit 300 on the side closer to the first mounting surface 310 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 closest to the first mounting surface 310 of the speaker unit 300 may include an open surface 241, or the portion of the frame body 200 located in front of the speaker unit 300 may include an open surface. The open surface 241 may also be referred to as the first open surface or the sound outlet of the speaker module. An open surface may mean that the side of the frame body 200 closest 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 figure, there is a certain gap 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 formation of a first open surface 241 at the upper end of the side wall 210. If 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, then 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. Sound waves generated by the vibration of the diaphragm 302 of the speaker unit 300 can then be radiated to the outside through the first open surface 241.
[0050] The volume of the first cavity 240 can be 0.1 liters (L) or more. For example, the volume of the first cavity 240 can be 0.1L, 0.15L, 0.2L, 0.25L, 0.3L, 0.35L, or 0.4L.
[0051] The volume of the first cavity 240 can be set such 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 greater. For example, the acoustic cutoff frequency of the speaker module 10 can be 4, 4.5, or 5.5 times the resonant frequency of the speaker module 10, so as to widen the operating bandwidth of the speaker module. This ensures the acoustic performance of the speaker module 10. The acoustic cutoff frequency may refer to a specific frequency at which the signal begins to stop passing through the system.
[0052] Above the acoustic cutoff frequency, the structure of the first cavity 240 does not affect the output of sound waves. If the operating frequency of the speaker module 10 is higher than the cutoff frequency, the electroacoustic conversion efficiency of the speaker module 10 gradually decreases. Therefore, based on the structural design of the first cavity 240, such as 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, and as a result, the speaker module has a wide operating bandwidth and high electroacoustic conversion efficiency is ensured. Thus, the acoustic performance of the speaker module 10 is ensured.
[0053] The top wall 220 may be positioned above the second mounting surface 211, and at least a portion of the top wall 220 may be attached to the side wall 210. "Above the second mounting surface 211" may mean that the top wall 220 is above the second mounting surface 211 in the z-axis direction as shown in the figure. The top wall 220 may 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 connect to the side wall 210 located at the tail portion of the speaker unit 300. The portion of the top wall 220 that connects to the side wall 210 may be connected to the inner circumference of the side wall 210 or 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 with a smaller radial size. Alternatively, the top wall 220 may continue to extend forward from the first mounting surface 310, that is, it may continue to extend in the negative direction of the y-axis as shown in Figure 1, provided that the top wall 220 is not fully connected to the side wall 210 located at the front end of the first mounting surface 310 and that a first open surface 241 is formed.
[0054] Some of the through holes 221 described above can be positioned on the top wall 220 in close proximity to the first mounting surface 310, for example, on the left and right sides of the top wall 220, and fastened to two upper through holes 308 of the first mounting surface 310, respectively, thereby enabling the frame body 200 to be attached to the speaker unit 300. The shape of the portion of the top wall 220 of the speaker unit 300 in close proximity to the first mounting surface 310 can be the same as the shape of the first mounting surface 310, so that the top wall 220 can be attached to the outer circumference of the first mounting surface 310 and form a sealed surface. The appearance of the top wall 220 can be the same as the appearance of the speaker unit 300, and a wedge surface can be formed on the top to reduce the volume of the speaker module 10 so that other components in the mounting scenario can be avoided when the speaker module 10 is mounted in a predetermined mounting position. The top wall 330 may instead be square, arc-shaped, planar, or irregular in shape, etc. This is not limited to the present invention.
[0055] A second cavity 250 can be formed between the frame body 200 and the surface of the diaphragm 302 of the speaker unit 300 on the side not facing the first mounting surface 310, that is, a space formed by the side wall 210, the top wall 220, and the surface of the diaphragm 302 on the side not facing the first mounting surface 310. The second cavity 250 can also be referred to as the rear cavity of the speaker module 10, and the surface of the diaphragm 302 on the side not facing the first mounting surface 310 can also be referred to as the rear portion of the diaphragm 302. Since the tail portion of the speaker unit 300 has a smaller radial size compared to the radial size of the head portion, a certain gap can exist between the tail portion of the speaker unit 300 and the side wall 210. In other words, a second open surface 251 can 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 an 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. Thus, the speaker module 10 can radiate sound waves outward in the opening direction, that is, it can propagate sound wave energy outward in the negative z-axis direction 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 toward the rear of the speaker unit 300, that is, it may continue to extend in the positive direction of the y-axis as 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 may be positioned 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 as shown in the figure. Some of the through holes 221 described above may instead be positioned on the bottom wall 230 in close proximity to the first mounting surface 310 of the speaker unit 300. For example, some of the through holes 221 may be positioned on the left and right sides of the bottom wall 230 and fastened to two lower through holes 308 of the first mounting surface 310, respectively, thereby allowing the frame body 200 to be mounted to the speaker unit 300. A sealed surface may be formed where the bottom wall 230 connects 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 circumference of the first mounting surface 310 of the speaker unit 300 can be separately attached to the top wall 220 and side walls 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 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. A sealing surface is formed where the frame body 200 is connected to the speaker unit 300, and as a result, the front cavity and rear cavity of the speaker unit 300 can be isolated, and mutual cancellation between front and rear sound waves can be avoided. This improves the efficiency of sound wave radiation in the direction of the first cavity 240.
[0058] The top wall 220, side walls 210, and bottom wall 230 may form a single integrated structure, or they may be multiple parts fastened together by welding or other means.
[0059] It should be noted that the term "same" in terms of size in the embodiments of this application does not mean exactly the same. As a person skilled in the art will understand, a person skilled in the art can appropriately adjust the size of machine parts based on design requirements, so a certain range of variation is acceptable in the "same" size of two machine parts. For example, the difference may be in the range of 0.1 mm to 0.5 mm.
[0060] In some embodiments, the speaker module 10 may further include a first subcavity 231. The first subcavity 231 may be located on the outer periphery of the frame body 200 and may communicate with the first cavity 240. The first subcavity 231 may also be referred to as a branch cavity. Refer to the structure shown in Figure 3. For example, the structure shown in Figure 3 may be a cross-sectional structure of the speaker module 10 along the yz plane. The branch cavity 231 may be located on the outer periphery of the bottom wall 230. The bottom wall 230 may also have through holes 232 so that the branch cavity 231 communicates with the first cavity 240. Multiple branch cavities 231 may be present. Multiple branch cavities 231 may be located at different positions on the bottom wall 230 and may communicate with the first cavity 240. The resonant frequencies of the multiple branched cavities 231 may differ from each other.
[0061] The first subcavity 231 may instead be located inside the frame body 200 (not shown). For example, the first subcavity 231 may be located on the speaker unit 300 away from the first mounting surface 310 and below the top wall 220. The location where the frame body 200 connects to the first mounting surface 310 of the speaker unit 300 may include a hole so that the first subcavity 231 communicates with the first cavity 240.
[0062] Figure 4 shows the acoustic effect when a branch cavity 231 is provided and when it is not provided, according to one embodiment of this application. The horizontal axis represents the sound wave frequency (in Hz), and the vertical axis represents the acoustic transfer function amplitude value (in dB). Providing a branch cavity can suppress the resonance peak of the first cavity 240 of the speaker module 10 and widen the bandwidth. This ensures the acoustic performance of the speaker module 10.
[0063] In some embodiments, the second mounting surface 211 on the side closer to the predetermined mounting position may further include a shock-absorbing pad 2113, the material of which may be, for example, rubber, plastic, or a composite material. For the position of the shock-absorbing pad 2113, please refer to the structure shown in Figure 5. In Figure 5, an example is used in which the inner sheet metal 41 of the vehicle door is used as the predetermined mounting position.
[0064] In one example, as shown in Figure 5(a), the shock-absorbing pad 2113 can be positioned 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 the vehicle door, and is configured to reduce the transmission of sound wave energy generated by the speaker module 10 in the direction normal to 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 is positioned on the underside of the entire second mounting surface 211. The shock-absorbing pad 2113 can also be parallel to the main plane of the second mounting surface 211. A corresponding hole (not shown) exists on the shock-absorbing pad 2113 at a position corresponding to the mounting hole 2111, so that a screw can pass through the mounting hole 2111 and the hole therethrough, and connect the predetermined mounting position by screw fastening.
[0065] In another example, as shown in Figure 5(b), the main plane of the shock-absorbing pad 2113 may be perpendicular to the main plane of the second mounting surface 211, that is, perpendicular to the inner sheet metal 41 of the vehicle door. The shock-absorbing pad 2113 can also be a ring-shaped structure, and the main plane of the shock-absorbing pad 2113 can be attached to the side wall 210 of the speaker module 10. When the speaker module 10 is attached to the inner sheet metal 41 of the vehicle door, the shock-absorbing pad 2113 can be positioned between the inner sheet metal 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 multiple shock-absorbing pads 2113. For example, the shock-absorbing pad 2113 can be positioned as shown in Figure 5(a), or the shock-absorbing pad 2113 can be positioned as shown in Figure 5(b).
[0067] The second mounting surface 211 may further include a support component 2112, which may be positioned on the side of the second mounting surface 211 that does not face the predetermined mounting position, for example, on the upper side of the second mounting surface 211 in the z-axis direction as 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 positioned across the entire second mounting surface 211. The support component 2112 can 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 narrow 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 narrow angle between the sound output direction of the first cavity 240 and the plane on which the first mounting surface 310 is located can be in the range of -30° to 30°.
[0069] Refer to the diagram in Figure 6 showing the installation of the speaker module at a predetermined mounting position. For example, the speaker unit 300 can be installed in a position close to the inside of the vehicle cabin, for example, on the vehicle door, i.e., the predetermined mounting position can be located on the vehicle door. In addition, the predetermined mounting position can be located on the inner sheet metal 41 of the vehicle door, and the predetermined mounting position can be part of the inner sheet metal 41 of the vehicle door, for example, a part that is in direct contact with the second mounting surface 211 of the speaker module. The inner sheet metal 41 of the vehicle door may include a mounting hole, and the speaker module 10 can be embedded in the mounting hole and attached to the inner sheet metal 41 of the vehicle door through the mounting hole. When the speaker module is installed at the predetermined mounting position, the main plane of the second mounting surface 211 of the speaker module may be parallel to the main plane of the predetermined mounting position, and the main plane of the predetermined mounting position may be parallel to the plane of the vehicle door. The plane of the vehicle door may be the plane on which the inner sheet metal 41 of the vehicle door is located. In the actual product, the inner sheet metal 41 of the vehicle door can have an irregular shape, for example, it may include protrusions and recesses. The plane on which the inner sheet metal 41 of the vehicle door is located can be a plane with a larger planar area on the inner sheet metal 41 of the vehicle door, and the speaker module is mounted on that planar portion of the inner sheet metal 41 of the vehicle door, thereby stabilizing the connection between the speaker module and the inner sheet metal of the vehicle door.
[0070] The vehicle door may further include an outer wall. The outer wall may be the 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 a hollow structure and have a specific volume. At least a portion of the speaker module 10 may be housed in this housing 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, a closed space can be formed between the speaker module 10 and the housing space at the predetermined mounting position. The speaker module 10 may radiate sound waves into the inner sheet metal space 42, thereby eliminating sound waves propagated by the speaker module 10 in the direction of the second cavity 250 and ensuring that sound waves propagate in the direction of the first cavity 240.
[0071] The narrow angle between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 can be α. In the mounting structure diagram shown in Figure 6(a), the narrow 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 can be the speaker module 10 shown in Figures 1 and 2. Alternatively, the speaker unit 300 may be tilted within the frame body 200, i.e., α does not have to be 0°. If α is a negative value, the opening direction of the speaker unit 300 can face the inside of the space enclosed by the frame body 200, i.e., it can face the direction of the accommodation space outside the cabin, as shown in Figure 6(b). If α is a positive value, the opening direction of the speaker unit 300 can face outwards from the space enclosed by the frame body 200, i.e., it can not face the direction of the accommodation space outside the cabin, as shown in Figure 6(c). The speaker unit 300 can be fixed to the frame body 200 in a structural relationship in which the narrow angle between the axial direction and the second mounting surface 211 is in the range of -30° to 30°. Alternatively, the speaker unit 300 may be rotatably connected to the frame body 200 so that the narrow angle between the axial direction of the speaker unit 300 and the second mounting surface 211 can be adjusted within the range of -30° to 30°. For example, the tail portion of the speaker unit 300 may 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 be in the range of -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 Figures 1 to 3, the plane on which the first mounting surface 310 is located may be parallel to the xz plane. The sound output direction of the speaker module 10 may be the main sound output direction of the speaker module, or it may be the direction of the maximum sound wave energy radiated by the speaker unit 300. In the structure shown in Figures 1 to 3, the sound output direction of the speaker module 10 may 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 surrounded by the upper end of the side wall 210, that is, perpendicular to the plane on which the open surface 241 is located. Refer to the direction of the arrows shown in Figure 2 or Figure 3. Specifically, when the speaker module 10 is mounted according to the structure shown in Figure 6(a), the 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, after reaching the bottom wall 220, the sound output direction changes and propagation is directed outward from 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 after the sound waves have changed after reaching the frame body 200. In the structure shown in Figure 6(a), the narrow 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 Figure 6(b), the narrow 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 Figure 6(c), the narrow 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 Figure 6(d), when the opening direction of the speaker unit 300 faces directly inward into the cockpit, that is, 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 directly propagated inward into the cabin in the z-axis direction shown in Figure 6, for example, in the direction indicated by the solid arrow in Figure 6(d). The tangential stiffness of the second mounting surface 211 is much higher than the normal stiffness. 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 the stiffness in the z-axis direction. Lower stiffness indicates a higher likelihood of vibration being generated by force. When sound wave energy is propagated in the z-axis direction, the direction of the force on the inner sheet metal of the vehicle door is also in the z-axis direction, i.e., in the direction indicated by the dashed arrow in the figure. As a result, the inner sheet metal 41 of the vehicle door vibrates easily in the z-axis direction, generating abnormal noises that affect the sound quality of the speaker module 10.
[0074] In the speaker module 10 provided in this embodiment of the application, the narrow angle between the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 is in the range of -30° to 30°. Furthermore, 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 also be in the range of -30° to 30°. Thus, the sound wave energy transmitted in the direction normal to the second mounting surface 211 can be effectively reduced. Consequently, vibrations of the position for the connection between the inner sheet metal 41 of the vehicle door and the inner sheet metal 41 of the vehicle door in the direction normal to the second mounting surface 211 can be effectively reduced, noise generated by the operation of the speaker module 10 can be reduced, and the sound quality of the speaker module 10 can be improved.
[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 the range of ±30°, ±25°, ±20°, ±15°, ±10°, or ±5°, 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 the range of ±30°, ±25°, ±20°, ±15°, ±10°, or ±5°.
[0076] Figure 7 is a diagram comparing the acceleration effects at different mounting angles according to one embodiment of this application. Higher acceleration levels result in stronger vibrations at the mounting position. As shown in Figure 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 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 narrow 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. As the narrow 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 gains significantly, and as the narrow 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 decreases continuously, 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 is in the range of 1 / 4 to 3 / 4. When the speaker module 10 is mounted in a predetermined mounting position, the frame body portion corresponding to the first cavity 240 can be housed in a housing space 42 formed in 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 referred to as the housing depth of the speaker module 10 in the housing space at the predetermined mounting position, or as the mounting depth of the second mounting surface. As shown in Figures 6(a) to 6(c), the predetermined mounting position can be the inner sheet metal 41 of the vehicle door, and a specific housing space can be formed between the inner sheet metal 41 and the outer sheet metal 43 of the vehicle door, where the outer sheet metal 43 is the outer 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 is h1, as 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 located in the housing space, furthest 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 housing space, furthest from the main plane of the second mounting surface 211, to the main plane of the second mounting surface 211. That is, the above sum is h2, as 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 having a ratio of the mounting depth of the speaker module 10 to the size of the speaker module 10 in a direction perpendicular to the main plane of the second mounting surface 211 that is 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] Figure 8 is a diagram comparing the acceleration effects corresponding to different mounting depths at a mounting location, according to one embodiment of this application. As shown in Figure 8, when the mounting depth of the speaker module is 0, i.e., when the speaker module is mounted on the surface of the mounting location and not in the accommodating space, the average acceleration level at the mounting location is 118.5 dB. When the ratio of mounting depth to speaker module height is 1 / 4, the average acceleration level at the mounting location is 111.5 dB. When the ratio of mounting depth to speaker module height is 3 / 4, the average acceleration level at the mounting location is 111.5 dB. When the mounting depth is 1 / 2, the average acceleration level at the mounting location is 105.7 dB. It can be seen that as the ratio of mounting depth to speaker module height increases from 0 to 1 / 4, the average acceleration level at the mounting location gains significantly, and vibration at the mounting location is greatly reduced.
[0079] Please refer to the mounting structure diagram shown in Figure 6. The inner sheet metal 41 and outer sheet metal 43 of the vehicle door can form a housing space 42. When the speaker module 10 is attached to the inner sheet metal 41 of the vehicle door, the frame body portion corresponding to the first cavity 240 can pass through the mounting hole in the inner sheet metal 41 of the vehicle door and be housed in the housing space. In addition, when the speaker module is attached to the inner sheet metal of the vehicle door, the opening 251 of the speaker module can communicate with the housing space 42. Furthermore, a sealing surface can be formed at the position where the second mounting surface 211 of the speaker module 10 is connected to the inner sheet metal 41 of the vehicle door, and a sealing surface can be formed at the position 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 housing space 42 to form a closed cavity together. The enclosed cavity can be isolated from the first cavity 240, thereby eliminating sound waves propagated by the speaker module 10 on the side where the second cavity 250 is located, and improving the effect of sound output on the first cavity 240 side.
[0080] The ratio of the volume of the second cavity 250 to the volume of the closed cavity can be 1 / 10 or less. For example, in order to further improve the bass effect of the first cavity 250, the volume of the closed cavity can be 10, 15, 20, or 25 times the volume of the second cavity 250.
[0081] Figure 9 shows another mounting structure according to one embodiment of this application. This figure of the mounting structure may be a top view of the speaker module 10, that is, a diagram of the overall structure corresponding to the view of the speaker module 10 perpendicular to the plane of the vehicle door. When the speaker module 10 is mounted to the inner sheet metal 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 sheet metal 41 of the vehicle door, in other words, parallel to the ground, that is, parallel to the x-axis direction shown in the figure. Figure 9 shows the angular relationship between the bottom of the inner sheet metal 41 of the vehicle door and the dashed line. In addition, as shown in Figure 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, that is, the part of the speaker module 10 that is 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 inclined, in which case a narrow angle exists 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 can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, or 80°, such that the sound outlet of the speaker module 10 is located on the right side of the speaker module as shown in Figure 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 instead be perpendicular to the lower contour of the inner sheet metal 41 of the vehicle door, such that the sound outlet of the speaker module 10 is located on the right side of the speaker module, as shown in Figure 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] The mounting structure shown in Figure 9 is merely an example of mounting the speaker module 10 to the mounting position, and the mounting position of the speaker module 10 should not be limited. The speaker module 10 may be mounted at any angle, that is, any narrow angle may exist between the first mounting surface 310 and the bottom contour of the inner sheet metal 41 of the vehicle door, and the speaker module 10 may be positioned at any position on the inner sheet metal 41 of the vehicle door, for example, it may be positioned at the bottom, top, left side, or right side of the inner sheet metal 41 of the vehicle door.
[0083] The structure shown in Figure 9 may represent a mounting structure corresponding to the case where the plane on which the first mounting surface 310 is located is perpendicular to the second mounting surface 211, or in other words, a mounting structure corresponding to the case where the axial direction of the speaker unit 300 is parallel to the main plane of the second mounting surface 211. When the axial direction of the speaker unit 300 and the main plane of the second mounting surface 211 are in the aforementioned narrow angle relationship, the first mounting surface 310 and the bottom contour of the inner sheet metal 41 of the vehicle door can also be in the aforementioned narrow angle relationship, and the sound outlet of the speaker module 10 can be located on the upper side, lower side, left side, or right side of the speaker module 10.
[0084] The circuit diagram shown in Figure 10 is an acoustically analogous equivalent circuit diagram of a speaker module 10 according to one embodiment of this application. The power supply P corresponds to the magnetic circuit system 305 in the speaker unit 300. The magnetic force generated when the magnetic circuit system 305 is powered on can drive the vibrating system to vibrate. The resistor Ras may correspond to the DC resistance of the voice coil 306 of the speaker unit 300. The capacitor Cas and inductor Mas may correspond to the equivalent compliance and quality of the vibrating system of the speaker unit 300. The power supply P, resistor Ras, capacitor Cas, and inductor Mas together can form the speaker unit 300. The capacitor Cab may correspond to the rear cavity of the speaker module 10. The lower half of the acoustically analogous equivalent circuit diagram, including capacitor Caf, resistor Raf, and inductor Maf, may correspond to the front cavity of the speaker module 10. The current direction shown in the figure is the flow of volume velocity. A specific volume velocity can exist in both the front cavity and the rear cavity of the speaker module, and the vibration velocities in the front cavity and the rear cavity may be the same.
[0085] In some embodiments, there may be multiple speaker units 300, and these multiple speaker units 300 may form a symmetrical structure. For example, Figure 11 is a diagram of the cross-sectional structure of another speaker module according to one embodiment of this application. As shown in Figure 11, there may be two speaker units 300, and the two speaker units 300 may be arranged facing each other to form an axisymmetric structure. Correspondingly, there may also be multiple frame bodies 200, 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, multiple speaker units 300 can each be housed in their corresponding frame bodies 200. The two speaker units 300 and their corresponding frame bodies 200 can form an independent speaker module, that is, two speaker modules are formed. The two speaker modules are arranged facing each other and are mounted separately in predetermined mounting positions. The two speaker units 300 and their corresponding frame bodies 200 may also form a single speaker module, that is, the two frame bodies 200 may be fastened together or form a single structure. For example, the two frame bodies 200 may share a side wall to form a single frame body 200. Arranging multiple speaker units 300 to form a symmetrical structure can further reduce vibrations generated at the mounting location, increase the sound pressure of the speaker module, and improve sound generation performance.
[0086] The speaker module provided in this embodiment of the 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, which may include any speaker module 10 as described in Figures 1-9. The speaker module 10 can be mounted on a vehicle door, for example, on the inner sheet metal of the vehicle door as described above. Alternatively, the speaker module may be mounted in a location such as an interior trim panel, floor, or ceiling of the vehicle. As described above, the example in which the mounting location is the inner sheet metal of the vehicle door is used. The inner and outer sheet metals of the vehicle door can form a housing space. When the speaker module is mounted on the inner sheet metal of the vehicle door, a portion of the frame body corresponding to the first cavity can pass through the mounting hole and be housed in the housing space. In addition, when the speaker module is mounted on the inner sheet metal of the vehicle door, the opening 251 of the speaker module can communicate with the housing space. In this case, the second open surface 251 allows the second cavity 250 and the housing space 42 to together form a closed cavity. The enclosed cavity is isolated from the first cavity 240, eliminating sound waves propagated by the speaker module on the side where the second cavity is located, thereby improving the sound output effect on the first cavity side. To further enhance the bass effect of the first cavity 240, the ratio of the volume of the second cavity 250 to the volume of the enclosed cavity can be reduced to 1 / 10 or less.
[0088] Furthermore, the speaker module may be mounted at other predetermined mounting locations inside the vehicle, provided that a sealing space can be formed between the predetermined mounting location and the speaker module. Similarly, the speaker module may instead be located outside the vehicle, or at other locations where a sealing space can be formed together with the speaker module, such as a wall or soundbox. The application scenarios and predetermined mounting locations 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 modification or substitution that is readily conceivable to a person skilled in the art within the scope of the art disclosed in this application falls within the scope of protection of this application. Accordingly, the scope of protection of this application is subject to the scope of protection of the claims.
Claims
1. A speaker module comprising a speaker unit and a frame body, wherein the speaker unit is disposed within the frame body, the speaker unit has a first mounting surface, the first mounting surface is located at the end of the speaker unit having a larger radial size, and the speaker unit is attached to the frame body via the first mounting surface. The speaker unit further has a diaphragm, which is arranged around the inside of the speaker unit, and the frame body and the surface of the diaphragm on the side closer to the first mounting surface form a first cavity, and the narrow 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°. The outer circumference of the frame body has a second mounting surface, the second mounting surface is configured to mount the speaker module to a predetermined mounting position, the main plane of the second mounting surface is parallel to the main plane of the predetermined mounting position, and the narrow 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°. Speaker module.
2. A second cavity can be formed between the frame body and the surface of the diaphragm that does not face the first mounting surface, the second cavity and the first cavity are respectively arranged on both sides of the second mounting surface in a direction perpendicular to the main plane of the second mounting surface, the frame body has an opening such that the second cavity is an open cavity, and the direction of the opening of the opening is perpendicular to the main plane of the second mounting surface, the speaker module according to claim 1.
3. The speaker module according to 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. The speaker module according to claim 1, wherein 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.
5. The speaker module according to claim 1, wherein the volume of the first cavity is 0.1 liters or more.
6. The speaker module according to claim 5, wherein the ratio of the acoustic cutoff frequency of the speaker module to the resonant frequency of the speaker module is 4 or more.
7. The speaker module according to claim 1, further comprising at least one first subcavity, the at least one first subcavity communicating with the first cavity.
8. The speaker module according to claim 1, wherein the surface of the second mounting surface on the side closer to the predetermined mounting position has an impact-absorbing pad.
9. The speaker module according to claim 1, wherein the second mounting surface has mounting holes, at least three mounting holes, and the mounting holes penetrate the second mounting surface in a direction perpendicular to the second mounting surface.
10. The speaker module according to claim 1, wherein there are multiple speaker units forming a symmetrical structure, and the first mounting surfaces of the multiple speaker units are in close proximity to each other.
11. The speaker module according to claim 10, wherein there are multiple frame bodies, the number of frame bodies is the same as the number of speaker units, and each of the multiple speaker units is housed in a corresponding frame body.
12. A vehicle having a speaker module according to any one of claims 1 to 11, 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 the planar direction of the vehicle door.
13. A vehicle having the speaker module according to claim 2 or 3, 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 the planar direction of the vehicle door, The vehicle further has an outer wall, and the outer wall and the predetermined mounting position form a housing space. When the speaker module is mounted in the predetermined mounting position, the portion of the frame body corresponding to the first cavity is located within the housing space, the opening communicates with the housing space, and the second cavity and the housing space form a closed cavity. vehicle.
14. The vehicle according to claim 13, wherein the ratio of the volume of the second cavity to the volume of the closed cavity is 1 / 10 or less.