Vehicle-mounted door loudspeaker module, vehicle-mounted sound system and vehicle

Abstract

The utility model discloses a vehicle-mounted door loudspeaker module, a vehicle-mounted sound system and a vehicle, the vehicle-mounted door loudspeaker module comprises a mounting frame, a loudspeaker unit and an acoustic waveguide structure, the mounting frame is provided with a mounting plate, and the mounting plate is used for fixedly connecting the vehicle-mounted door loudspeaker module with the mounting position of a vehicle door metal plate; the main plane of the mounting plate is parallel to the plane where the mounting position is located, the loudspeaker unit is fixed in the mounting frame and comprises a vibrating diaphragm, the vibrating diaphragm and the mounting frame define a front sounding cavity, and the included angle between the axis of the loudspeaker unit and the main plane of the mounting plate is smaller than a preset angle, so that resonance between the vibration assembly and a vehicle door metal plate during vibration is avoided; and the sound waveguide structure is arranged in the sound production front cavity, so that the cavity volume of the sound production front cavity is reduced, the harmonic peak is weakened, the resonant frequency is migrated to high frequency, the overall bandwidth is expanded, the influence of the front cavity effect on the low-frequency-band sound quality is weakened, and the uniformity of low-frequency response is improved.

Description

Technical Field

[0001] This utility model relates to loudspeaker technology, and more particularly to a vehicle door loudspeaker module, a vehicle audio system, and a vehicle. Background Technology

[0002] In recent years, with the rapid development of the automotive industry, the application and development of car speakers have become increasingly widespread. In car audio systems, door speakers are responsible for reproducing low-frequency sounds and are usually located inside the car doors.

[0003] Traditional car door speakers have their axis perpendicular to the door sheet metal, and the vibration direction of their vibrating components is also perpendicular to the door sheet metal. When the music volume is high, the amplitude of the vibrating components is large, which often causes the door sheet metal to resonate significantly, thus affecting the low-frequency sound output of the car door speaker and its sound quality. Utility Model Content

[0004] This utility model provides a vehicle door speaker module, a vehicle audio system, and a vehicle, which can prevent resonance between the vibrating components and the door sheet metal when the components vibrate, improve the low-frequency sound quality of the vehicle door speaker, and improve the uniformity of the low-frequency response.

[0005] In a first aspect, this utility model provides a vehicle door speaker module, comprising:

[0006] The mounting frame includes a mounting plate for fixing the vehicle door speaker module to the mounting position of the vehicle door sheet metal. The main plane of the mounting plate is parallel to the plane where the mounting position is located.

[0007] A loudspeaker unit is fixed within the mounting frame. The loudspeaker unit includes a diaphragm, which, together with the mounting frame, forms a sound-producing cavity. The angle between the axis of the loudspeaker unit and the main plane of the mounting plate is less than a preset angle.

[0008] An acoustic waveguide structure is fixedly connected to the mounting frame and disposed within the sound-producing cavity. The distance between the acoustic waveguide structure and the diaphragm is greater than the maximum linear displacement of the diaphragm during vibration.

[0009] Optionally, the acoustic waveguide structure is cone-shaped.

[0010] Optionally, the acoustic waveguide structure is a hollow structure.

[0011] Optionally, the acoustic waveguide structure has an opening near the end face of the diaphragm.

[0012] Optionally, the acoustic waveguide structure is filled with sound-absorbing material.

[0013] Optionally, the mounting frame further includes an abutment portion, a first enclosure portion, and a second enclosure portion, wherein the second enclosure portion is disposed on a first side of the mounting plate, and the abutment portion is disposed on a second side of the mounting plate opposite to the first side;

[0014] The first end face of the abutting part is fixed on the mounting plate, and the second end face of the abutting part is used to abut against the plane where the mounting position is located. The first end face and the second end face are opposite end faces.

[0015] The first enclosing portion is fixedly connected to the second end face of the abutting portion, and together with the abutting portion, they enclose a mounting cavity, in which the speaker unit is disposed;

[0016] The sound-emitting end face of the speaker unit is fixed to the first enclosure and the second enclosure;

[0017] The second enclosure is closed to the sound-emitting end face of the speaker unit on the first side of the mounting plate;

[0018] The second end face of the abutment portion opens and surrounds the end face of the speaker unit on the sound output side to form a sound outlet.

[0019] Optionally, the shape of the acoustic waveguide structure on the first side of the mounting plate follows that of the diaphragm, and the shape of the acoustic waveguide structure on the second side of the mounting plate is parabolic.

[0020] Optionally, the first side of the acoustic waveguide structure, away from the diaphragm, is provided with a bend in the diaphragm's fold ring. The vertex of the bend and the target point, which is the maximum distance from the effective vibration region of the fold ring to the end face of the speaker unit's sound output side, coincide on the vertical projection of the end face of the speaker unit's sound output side. The distance between the vertex of the bend and the target point is greater than the maximum linear displacement of the diaphragm during vibration.

[0021] The end of the bent portion away from the mounting plate is fixed between the second enclosure and the end face of the speaker unit on the sound output side, and extends outward from the second enclosure to form an extension portion, which extends to the bottom of the speaker unit.

[0022] The second side of the acoustic waveguide structure, away from the diaphragm, is fixed to the abutment portion.

[0023] Optionally, the bent portion is provided with multiple leakage holes.

[0024] Optionally, a damping mesh is attached to the leakage hole.

[0025] Secondly, this utility model also provides a vehicle audio system, including the vehicle door speaker module as provided in the first aspect of this utility model.

[0026] Thirdly, the present invention also provides a vehicle including the vehicle audio system as provided in the second aspect of the present invention.

[0027] The vehicle door speaker module provided by this utility model includes a mounting frame, a speaker unit, and an acoustic waveguide structure. The mounting frame is provided with a mounting plate, which is used to fix the vehicle door speaker module to the mounting position of the vehicle door sheet metal. The main plane of the mounting plate is parallel to the plane where the mounting position is located. The speaker unit is fixed in the mounting frame and includes a diaphragm. The diaphragm and the mounting frame enclose a sound-producing front cavity. The angle between the axis of the speaker unit and the main plane of the mounting plate is less than a preset angle to avoid resonance between the vibrating component and the vehicle door sheet metal when vibrating, thereby improving the low-frequency sound quality of the vehicle door speaker. The acoustic waveguide structure is fixedly connected to the mounting frame and is disposed in the sound-producing front cavity. The distance between the acoustic waveguide structure and the diaphragm is greater than the maximum linear displacement of the diaphragm when vibrating. The acoustic waveguide structure reduces the cavity volume of the sound-producing front cavity, thereby weakening the resonance peak and shifting the resonance frequency to higher frequencies, weakening the influence of the front cavity effect on the low-frequency sound quality, and improving the uniformity of the low-frequency response. Attached Figure Description

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0029] Figure 1 An isometric view of a vehicle door speaker module provided by this utility model;

[0030] Figure 2 This is a front view of the vehicle door speaker module provided by this utility model;

[0031] Figure 3 A cross-sectional view of the vehicle door speaker module provided by this utility model;

[0032] Figure 4 A schematic diagram of the installation frame provided by this utility model;

[0033] Figure 5 A schematic diagram of the speaker unit provided by this utility model;

[0034] Figure 6 A schematic diagram of an acoustic waveguide structure provided by this utility model;

[0035] Figure 7 The diagram shows the simulation test results of door sheet metal vibration for existing vehicle door speaker modules.

[0036] Figure 8The diagram shows the simulation test results of the door sheet metal vibration of the vehicle door speaker module of this utility model;

[0037] Figure 9 The diagram shows the simulation results of the directivity of the vehicle door speaker module of this utility model.

[0038] Figure 10 This is a comparison chart of the frequency response curves of the vehicle door speaker modules of this utility model and the prior art. Detailed Implementation

[0039] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Additionally, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0042] Figure 1 This is an isometric view of a vehicle door speaker module provided by this utility model. Figure 2 This is a front view of the vehicle door speaker module provided by this utility model. Figure 3 This is a cross-sectional view of the vehicle door speaker module provided by this utility model, with the cross-sectional lines as shown. Figure 1As shown in A-A', Figure 4 A schematic diagram of the installation frame provided by this utility model. Figure 5 A schematic diagram of the speaker unit provided by this utility model is shown below. Figures 1-5 As shown, the vehicle door speaker module includes a mounting frame 100, a speaker unit 200, and an acoustic waveguide structure 300.

[0043] The mounting frame 100 primarily houses the speaker unit 200 and secures the door speaker module to the door sheet metal 400. Specifically, the mounting frame 100 includes a mounting plate 110, which is used to securely connect the door speaker module to the door sheet metal 400. The main plane 111 of the mounting plate 110 is parallel to the plane 401 where the installation position is located. The main plane 111 of the mounting plate 110 is the largest plane on the mounting plate 110. For example, the mounting plate 110 has multiple fixing holes 112, and bolts passing through the fixing holes 112 securely connect the door speaker module to the door sheet metal 400.

[0044] The speaker unit 200 is fixed within the mounting frame 100. Exemplarily, the speaker unit 200 has a cone-shaped structure and includes a frame 210, a vibration assembly, and a magnetic circuit assembly. The angle θ between the axis O-O' of the speaker unit 200 and the main plane 111 of the mounting plate 110 is less than a preset angle; for example, the angle θ is less than 5°. In a specific embodiment of this invention, the angle θ can be equal to 0°. Because the angle θ between the axis O-O' of the speaker unit 200 and the main plane 111 of the mounting plate 110 is less than the preset angle, the vibration direction of the vibration assembly has a very small angle with the door sheet metal 400, or is parallel to it, preventing resonance between the vibration assembly and the door sheet metal 400 during vibration, thereby improving the low-frequency sound quality of the vehicle door speaker.

[0045] The speaker frame 210 has a cone-shaped structure and serves as the main support structure for the speaker unit 200. The end face with the larger radial dimension of the speaker frame 210 serves as the sound output end face 211 of the speaker unit 200, while the end face with the smaller radial dimension is called the bottom face. The side walls of the speaker frame 210 can be designed with openwork to reduce its weight. The speaker frame 210 is generally made of materials that are lightweight, resistant to deformation, and have good heat dissipation, such as aluminum alloy.

[0046] The vibrating assembly is disposed inside the frame 210. Exemplarily, the vibrating assembly includes a diaphragm (or cone) 221, a voice coil 222, a centering support 223, and a surround 224. The diaphragm 221 surrounds the inner circumference of the frame 210, with one end fixedly connected to the voice coil 222 and the other end fixedly connected to the sound-emitting end face 211 via the surround 224. The diaphragm 221 can be conical or shallow pot-shaped; exemplaryly, a conical shape is used as an example in this embodiment. The material of the diaphragm 221 can be pulp, fiber, plastic, etc. The diaphragm 221 and the mounting frame 100 enclose a sound-producing cavity 101. The surround 224 can be annular, arranged circumferentially around the sound-emitting end face 211. The surround 224 can be made of cloth, natural rubber, foam, etc., with both ends heat-pressed and bonded to the diaphragm 221 and the sound-emitting end face 211, respectively. The voice coil 222 can be formed by winding a wire around a tubular frame. The edge of the centering support 223 is fixed inside the frame 210, and the voice coil 222 passes through the opening in the center of the centering support 223 and is fixedly connected to the centering support 223. The centering support 223 and the surround 224 work together to ensure that the voice coil 222 moves along the axial direction O-O' of the loudspeaker unit 200 without lateral movement. The centering support 223 can be made of cotton fabric, fiber material, etc. The magnetic circuit assembly includes a magnetic cup 231, a permanent magnet 232, and a magnetic sheet 233. The magnetic cup 231 is upside down and set at the bottom of the frame 210, the permanent magnet 232 is inside the bottom of the magnetic cup 231, and the magnetic sheet 233 is set on the permanent magnet 232. The permanent magnet 232 and the magnetic plate 233 form a magnetic gap with the inner wall of the magnetic cup 231. An opening is provided at the bottom of the frame 210, and the voice coil 222 passes through the opening at the bottom of the frame 210 and is inserted into the magnetic gap. The permanent magnet 232 can be a magnetic steel to provide the magnetic field. The magnetic cup 231 and the magnetic plate 233 can be made of magnetically conductive material to confine the magnetic field lines and improve magnetic energy utilization. A dust cap 225 can be fitted onto the end of the voice coil 222 away from the magnetic circuit assembly to prevent dust from falling into the voice coil 222 and vibrating within it, generating noise. When the speaker unit 200 is powered on, the voice coil 222 generates a magnetic field, which interacts with the magnetic field of the magnetic circuit assembly, causing the voice coil 222 to vibrate. The vibration of the voice coil 222, in turn, causes the diaphragm 221 to vibrate, which in turn drives the air to vibrate, thereby producing sound.

[0047] The acoustic waveguide structure 300 is fixedly connected to the mounting frame 100 and is located in the sound-producing cavity 101. The distance between the acoustic waveguide structure 300 and the diaphragm 221 is greater than the maximum linear displacement of the diaphragm 221 when it vibrates, so as to avoid the diaphragm 221 from contacting the acoustic waveguide structure 300 when it vibrates, thus affecting the sound production effect.

[0048] During the vibration of diaphragm 221, the direction of the generated sound waves is not perpendicular to the axis of motion of voice coil 222 (O-O'), but rather towards the front side of the central axis of diaphragm 221. The sound waves symmetrically emitted from various parts of diaphragm 221 create acoustic focusing, much like light focusing. Within the pre-cavity 101, sound wave factors collide due to focusing, and the resulting sound waves radiate forward along the central axis (O-O'), causing interference and resonance, leading to degradation of low-frequency sound quality. This interference caused by acoustic focusing is known in the industry as the pre-cavity effect.

[0049] The function of the acoustic waveguide structure 300 is to reduce the cavity volume of the pre-sound cavity 101, thereby weakening the resonance peak and shifting the resonance frequency (the frequency at which the resonance peak occurs) to a higher frequency, thereby weakening the effect of the pre-cavity effect on the sound quality of the low frequency band and improving the uniformity of the low frequency response.

[0050] Specifically, the relationship between the volume of the prephonal cavity and the vocal capacity is shown in the following formula:

[0051]

[0052] Among them, C a Let V be the volume of the pre-phonation cavity, ρ0 be the density of the medium (usually air), and c0 be the speed of sound in the medium. The acoustic capacity reflects the energy storage and release characteristics of sound during propagation.

[0053] The relationship between resonant frequency and acoustic capacitance is shown in the following equation:

[0054]

[0055] Among them, F P M is the resonant frequency. a Sound quality refers to the inertial characteristics of sound during its propagation.

[0056] As can be seen from the above, the acoustic volume is positively correlated with the volume of the pre-vocal cavity, while the resonant frequency is inversely correlated with the acoustic volume. Therefore, the resonant frequency is inversely correlated with the volume of the pre-vocal cavity, meaning that the smaller the volume of the pre-vocal cavity, the higher the resonant frequency. Thus, by reducing the volume of the pre-vocal cavity, the resonant frequency can be shifted to higher frequencies, widening the low-frequency bandwidth. At the same time, the amplitude of the resonant peak is weakened, reducing the amplitude difference between the peaks and troughs on the frequency response curve, thereby improving the uniformity of the low-frequency response.

[0057] The vehicle door speaker module provided by this utility model includes a mounting frame, a speaker unit, and an acoustic waveguide structure. The mounting frame is provided with a mounting plate, which is used to fix the vehicle door speaker module to the mounting position of the vehicle door sheet metal. The main plane of the mounting plate is parallel to the plane where the mounting position is located. The speaker unit is fixed in the mounting frame and includes a diaphragm. The diaphragm and the mounting frame enclose a sound-producing front cavity. The angle between the axis of the speaker unit and the main plane of the mounting plate is less than a preset angle to avoid resonance between the vibrating component and the vehicle door sheet metal when vibrating, thereby improving the low-frequency sound quality of the vehicle door speaker. The acoustic waveguide structure is fixedly connected to the mounting frame and is disposed in the sound-producing front cavity. The distance between the acoustic waveguide structure and the diaphragm is greater than the maximum linear displacement of the diaphragm when vibrating. The acoustic waveguide structure reduces the cavity volume of the sound-producing front cavity, thereby weakening the resonance peak and shifting the resonance frequency to higher frequencies, weakening the influence of the front cavity effect on the low-frequency sound quality, and improving the uniformity of the low-frequency response.

[0058] Figure 6 This is a schematic diagram of an acoustic waveguide structure provided by this utility model, for reference. Figure 3 and Figure 6 In some embodiments of this utility model, the acoustic waveguide structure 300 is generally cone-shaped, and the surface near the diaphragm 211 follows the curved shape of the diaphragm 221, thereby minimizing the volume of the pre-sound cavity 101, weakening the effect of the pre-cavity effect on the low-frequency sound quality, and improving the uniformity of the low-frequency response.

[0059] In some embodiments of this utility model, reference is made to Figure 3 and Figure 6 The acoustic waveguide structure 300 is a hollow structure and is made of energy-absorbing materials such as fibers and cotton fabrics, which gives it a certain ability to absorb resonance peaks, thereby weakening the resonance peaks and improving the uniformity of low-frequency response.

[0060] In some embodiments of this utility model, reference is made to Figure 3 and Figure 6 The acoustic waveguide structure 300 has an opening 301 on its end face near the diaphragm 221. The distance from the end face of the acoustic waveguide structure 300 near the diaphragm 221 to the dust cap 225 is greater than the maximum linear displacement of the diaphragm during vibration. For example, in one specific embodiment, the distance from the end face of the acoustic waveguide structure 300 near the diaphragm 221 to the dust cap 225 is 1.5 times the maximum linear displacement of the diaphragm during vibration.

[0061] In some embodiments of this invention, the acoustic waveguide structure 300 is filled with sound-absorbing material. The sound-absorbing material 302 can be sound-absorbing cotton. The sound waves generated by the diaphragm 221 first lose sound energy through the acoustic waveguide structure 300. Then, based on the viscous effect of the sound-absorbing material, friction further dissipates the sound energy. Through these two stages of sound energy dissipation, the intensity of the resonance peak can be effectively reduced and the broadband sound absorption capability enhanced, thereby reducing the loss of the acoustic waveguide. Furthermore, the sound-absorbing material can also reduce the intensity of the resonance peak, reduce airflow noise, and improve the speaker's low-frequency response and depth.

[0062] In some embodiments of this utility model, reference is made to Figures 1-6 The mounting frame 100 also includes an abutment portion 120, a first enclosure portion 130, and a second enclosure portion 140. The second enclosure portion 140 is disposed on the first side of the mounting plate 110, and the abutment portion 120 is disposed on the second side of the mounting plate 110 opposite to the first side.

[0063] The first end face of the abutment portion 120 is fixed to the mounting plate 110, and the second end face of the abutment portion 120 is used to abut against the plane 401 where the installation position is located. The first end face and the second end face are opposite end faces. For example, the second end face of the abutment portion 120 is also provided with a buffer pad 121, which plays a buffering role between the abutment portion 120 and the door sheet metal 400, reducing the impact of the vibration of the vibration assembly 200 on the door sheet metal 400.

[0064] The first enclosure portion 130 is fixedly connected to the second end face of the abutment portion 120, and together with the abutment portion 120, they enclose and form a mounting cavity 131, in which the speaker unit 200 is disposed.

[0065] The sound-emitting end face 211 of the speaker unit 200 is fixed to the first enclosure portion 130 and the second enclosure portion 140. For example, both the first enclosure portion 130 and the second enclosure portion 140 are provided with fixing holes 113, and the speaker unit 200 is fixed by bolts passing through the fixing holes 112.

[0066] The second enclosure 140 is closed to the sound-emitting end face 211 of the speaker unit 200 on the first side of the mounting plate 110, forming a sound-emitting front cavity 101, which also serves to prevent water and dust.

[0067] The second end face of the abutment portion 120 is open and surrounds the end face 211 of the speaker unit 200 on the sound output side to form a sound outlet 201, which points towards the door sheet metal 400.

[0068] In some embodiments of this utility model, reference is made to Figure 3 and Figure 6The shape of the acoustic waveguide structure 300 on the first side of the mounting plate 110 follows the diaphragm 221 and is a conical surface. The control line of the surface of the acoustic waveguide structure 300 on the second side of the mounting plate 110 (i.e. the side located at the sound outlet 201) is an exponential curve, which is intended to minimize the volume of the sound front cavity 101, widen the frequency band of the speaker module, and at the same time, change the propagation direction and radiation angle of the sound wave, so that it is directed toward the door sheet metal 400.

[0069] In some embodiments of this utility model, reference is made to Figure 3 and Figure 6 The first side of the acoustic waveguide structure 300, away from the diaphragm 221, has a bent portion 310 provided on the end face of the ring 224. The bent portion 310 is provided in a semi-circumferential manner along the first side of the acoustic waveguide structure 300. The vertex P1 of the bent portion 310 and the target point P2, which is the maximum distance from the effective vibration region of the ring 224 to the end face 211 of the speaker unit 200, are vertically projected onto the end face 211 of the speaker unit 200. Specifically, the effective vibration region of the ring 224 is the region that can vibrate during vibration, typically the region from one end of the ring 224 near the axis O-O' to one-third of the entire ring 224. The target point P2, which is the maximum distance from the effective vibration region to the end face 211 of the speaker unit 200, is the one-third distance from one end of the ring 224 near the axis O-O' to the end face 211 of the entire ring 224. The distance between the vertex P1 of the bend 310 and the target point P2 is greater than the maximum linear displacement of the diaphragm 221 when it vibrates, so as to avoid the fold ring 224 from contacting the bend 310 when it vibrates, thus affecting the sound production effect.

[0070] The end of the bent portion 310 away from the mounting plate 110 is fixed between the second enclosure portion 140 and the end face 211 of the sound output side of the speaker unit 200, and extends outward from the second enclosure portion 140 to form an extension portion 320. The extension portion 320 extends to the bottom of the speaker unit 200 and forms a shield on the side of the speaker unit 200, which serves to prevent water and moisture.

[0071] The second side of the acoustic waveguide structure 300, away from the end face of the diaphragm 221, is fixed to the abutment portion 120.

[0072] In some embodiments of this utility model, reference is made to Figure 3 and Figure 6The bent portion 310 is provided with multiple leakage holes 311, which are evenly arranged along the circumference of the bent portion 310. Due to the presence of the acoustic waveguide structure 300, the sound waves generated by the vibration of the diaphragm 221 propagate back and forth between the diaphragm 221 and the acoustic waveguide structure 300, which easily generates standing waves, leading to sound quality problems such as sound distortion and uneven low-frequency response of the speaker. This invention provides multiple leakage holes 311 on the bent portion 310, allowing the sound waves propagating back and forth between the diaphragm 221 and the acoustic waveguide structure 300 to be released through the leakage holes 311, thus disrupting the boundary conditions for standing wave formation and improving sound quality. For example, in a specific embodiment of this invention, the radius of the leakage hole 311 is 5 mm.

[0073] In some embodiments of this utility model, a damping mesh is attached to the leakage hole 311 in order to reduce the attenuation of the speaker at low frequencies and enhance the damping in the low-frequency range.

[0074] To verify the effectiveness of the vehicle door speaker module of this invention, a simulation test was conducted. Specifically, the vehicle door speaker module was fixed to a test baffle using a mounting plate, and a 1N excitation was applied to the magnetic cup. The simulation test results are as follows:

[0075] Figure 7 The image shows the simulation test results of door sheet metal vibration for existing automotive door speaker modules. Figure 8 The diagram shows the simulation test results of the door sheet metal vibration of the vehicle door speaker module of this utility model. (Reference) Figure 7 , 8 During operation, the maximum displacement of the existing vehicle door speaker module that causes vibration of the door sheet metal in the Y direction perpendicular to the door sheet metal is 9.3 × 10⁻⁶. -4 During operation, the maximum displacement of the vehicle door speaker module of this invention, causing vibration of the door sheet metal in the direction perpendicular to the door sheet metal, is 6.8 × 10 mm. -6 mm, the vibration amplitude of the door sheet metal in the direction perpendicular to the door sheet metal (i.e., the Y direction) is significantly reduced. In addition, the vibration amplitude in the plane where the door sheet metal is located (including the X and Z directions) is also significantly reduced.

[0076] Figure 9 The diagram shows the simulation results of the directivity of the vehicle door speaker module of this invention. The sound pressure distribution of the vehicle door speaker module was tested at angles of 0°, 30°, 45°, and 60° to the axial direction O-O'. Figure 9 As shown, the sound pressure distribution of the vehicle door speaker module of this utility model is almost uniform in all directions in the mid-low frequency (within 1000Hz), that is, the mid-low frequency directivity is uniform.

[0077] Figure 10This is a comparison chart of the frequency response curves of the vehicle door speaker modules of this utility model and the prior art, such as... Figure 10 As shown, the frequency response curve of the existing vehicle door speaker module begins to decay around 700Hz and has a significant resonance peak, reaching 96dB. The frequency response curve of the vehicle door speaker module of this invention shows that the resonance peak disappears around 700Hz, and correspondingly, the frequency of the resonance peak shifts to a higher frequency of around 950Hz, widening the frequency range to 1300Hz. Furthermore, the peak value is reduced to 90dB, significantly improving the uniformity of the low-frequency response and achieving a broadband sound absorption effect.

[0078] This utility model also provides a vehicle audio system, including a vehicle door speaker module as provided in any of the foregoing embodiments of this utility model.

[0079] This utility model also provides a vehicle, including the vehicle audio system provided in the foregoing embodiments of this utility model.

[0080] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0081] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0082] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0083] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A door speaker module for a vehicle, the door speaker module comprising: include: The mounting frame includes a mounting plate for fixing the vehicle door speaker module to the mounting position of the vehicle door sheet metal. The main plane of the mounting plate is parallel to the plane where the mounting position is located. A loudspeaker unit is fixed within the mounting frame. The loudspeaker unit includes a diaphragm, which, together with the mounting frame, forms a sound-producing cavity. The angle between the axis of the loudspeaker unit and the main plane of the mounting plate is less than a preset angle. An acoustic waveguide structure is fixedly connected to the mounting frame and disposed within the sound-producing cavity. The distance between the acoustic waveguide structure and the diaphragm is greater than the maximum linear displacement of the diaphragm during vibration.

2. The door speaker module for a vehicle according to claim 1, wherein The acoustic waveguide structure is cone-shaped.

3. The door speaker module for a vehicle according to claim 2, wherein The acoustic waveguide structure is a hollow structure.

4. The door speaker module of claim 3, wherein, The acoustic waveguide structure has an opening at the end face near the diaphragm.

5. The door speaker module of claim 3, wherein, The acoustic waveguide structure is filled with sound-absorbing material.

6. The door speaker module for a vehicle according to any one of claims 1 to 5, characterized in that, The mounting frame further includes an abutting portion, a first enclosing portion, and a second enclosing portion. The second enclosing portion is disposed on a first side of the mounting plate, and the abutting portion is disposed on a second side of the mounting plate opposite to the first side. The first end face of the abutting part is fixed on the mounting plate, and the second end face of the abutting part is used to abut against the plane where the mounting position is located. The first end face and the second end face are opposite end faces. The first enclosing portion is fixedly connected to the second end face of the abutting portion, and together with the abutting portion, they enclose a mounting cavity, in which the speaker unit is disposed; The sound-emitting end face of the speaker unit is fixed to the first enclosure and the second enclosure; The second enclosure is closed to the sound-emitting end face of the speaker unit on the first side of the mounting plate; The second end face of the abutment portion opens and surrounds the end face of the speaker unit on the sound output side to form a sound outlet.

7. The door speaker module of claim 6, wherein, The shape of the acoustic waveguide structure on the first side of the mounting plate follows that of the diaphragm, and the shape of the acoustic waveguide structure on the second side of the mounting plate is parabolic.

8. The door speaker module for a vehicle of claim 7, wherein, The first side of the acoustic waveguide structure, away from the end face of the diaphragm, is provided with a bend in the folded ring of the diaphragm. The vertex of the bend and the target point, which is the maximum distance from the effective vibration region of the folded ring to the end face of the sound output side of the loudspeaker unit, coincide in the vertical projection of the target point on the end face of the sound output side of the loudspeaker unit. The distance between the vertex of the bend and the target point is greater than the maximum linear displacement of the diaphragm when it vibrates. The end of the bent portion away from the mounting plate is fixed between the second enclosure and the end face of the speaker unit on the sound output side, and extends outward from the second enclosure to form an extension portion, which extends to the bottom of the speaker unit. The second side of the acoustic waveguide structure, away from the diaphragm, is fixed to the abutment portion.

9. The door speaker module for a vehicle of claim 8, wherein, The bent portion is provided with multiple leakage holes.

10. The door speaker module of claim 9, wherein, A damping mesh is attached to the leakage hole.

11. An in-vehicle audio system, characterized by comprising: Includes the vehicle door speaker module as described in any one of claims 1-10.

12. A vehicle characterized by comprising: Including the vehicle audio system as described in claim 11.

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