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

Abstract

The invention 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] The present invention relates to speaker technology, and particularly to an in-vehicle door speaker module, an in-vehicle audio system, and a vehicle. Background Art

[0002] In recent years, with the rapid development of the automotive industry, the application and development of in-vehicle speakers have become increasingly widespread. In an in-vehicle audio system, the in-vehicle door speaker is responsible for the reproduction of low-frequency sounds and is usually arranged inside the vehicle door.

[0003] For a traditional in-vehicle door speaker, its axis is perpendicular to the door sheet metal, and the vibration direction of its vibration component is perpendicular to the door sheet metal. When playing music at a relatively high volume, the amplitude of the vibration component is relatively large, and the door sheet metal often generates a relatively large resonance, which in turn affects the low-frequency sound production of the in-vehicle door speaker and the sound quality of the in-vehicle door speaker. Summary of the Invention

[0004] The present invention provides an in-vehicle door speaker module, an in-vehicle audio system, and a vehicle, which can avoid resonance between the vibration component and the door sheet metal during vibration, improve the low-frequency sound quality of the in-vehicle door speaker, and improve the uniformity of low-frequency response.

[0005] In a first aspect, the present invention provides an in-vehicle door speaker module, including:

[0006] A mounting frame, the mounting frame is provided with a mounting plate, the mounting plate is used for fixedly connecting the mounting position of the in-vehicle door speaker module to the door sheet metal, and the main plane of the mounting plate is parallel to the plane where the mounting position is located;

[0007] A speaker unit, the speaker unit is fixed inside the mounting frame, the speaker unit includes a diaphragm, the diaphragm and the mounting frame enclose a front sound cavity, and the angle between the axis of the speaker unit and the main plane of the mounting plate is less than a preset angle;

[0008] An acoustic waveguide structure, the acoustic waveguide structure is fixedly connected to the mounting frame and is arranged inside the front sound cavity, and the distance between the acoustic waveguide structure and the diaphragm is greater than the maximum linear displacement when the diaphragm vibrates.

[0009] Optionally, the acoustic waveguide structure is in a conical shape.

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

[0011] Optionally, the end face of the acoustic waveguide structure close to the diaphragm is open.

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

[0013] Optionally, the mounting frame further includes an abutting portion, a first enclosing portion, and a second enclosing portion. The second enclosing portion is disposed on the first side of the mounting plate, and the abutting portion is disposed on the second side of the mounting plate opposite to the first side;

[0014] The first end face of the abutting portion is fixed on the mounting plate, and the second end face of the abutting portion is for abutting 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 encloses an installation cavity with the abutting portion. The speaker unit is disposed in the installation cavity;

[0016] The end face of the sound-emitting side of the speaker unit is fixed on the first enclosing portion and the second enclosing portion;

[0017] The second enclosing portion closes the end face of the sound-emitting side of the speaker unit on the first side of the mounting plate;

[0018] The second end face of the abutting portion is open and encloses a sound-emitting port with the end face of the sound-emitting side of the speaker unit.

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

[0020] Optionally, a bending portion is provided on the end face of the first side of the sound waveguide structure away from the diaphragm to adapt to the surround of the diaphragm. The vertex of the bending portion and the target point with the maximum distance to the end face of the sound-emitting side of the speaker unit in the effective vibration region of the surround coincide in the vertical projection on the end face of the sound-emitting side of the speaker unit, and the distance between the vertex of the bending portion and the target point is greater than the maximum linear displacement during the vibration of the diaphragm;

[0021] The end of the bending portion away from the mounting plate is fixed between the second enclosing portion and the end face of the sound-emitting side of the speaker unit and extends outward from the second enclosing portion to form an extension portion, and the extension portion extends to the bottom of the speaker unit;

[0022] The end face of the second side of the sound waveguide structure away from the diaphragm is fixed on the abutting portion.

[0023] Optionally, a plurality of leakage holes are provided on the bending portion.

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

[0025] In a second aspect, the present invention further provides an in-vehicle audio system, including the in-vehicle door speaker module provided in the first aspect of the present invention.

[0026] In a third aspect, the present invention further provides a vehicle, including the in-vehicle audio system provided in the second aspect of the present invention.

[0027] The in-vehicle door speaker module provided by the present invention includes a mounting frame, a speaker unit, and a sound waveguide structure. The mounting frame is provided with a mounting plate, which is used for fixedly connecting the in-vehicle door speaker module to the installation position of the vehicle door sheet metal. The main plane of the mounting plate is parallel to the plane where the installation position is located. The speaker unit is fixed within the mounting frame. The speaker unit includes a diaphragm, and the diaphragm and the mounting frame enclose a pre-sound cavity. The angle between the axis of the speaker unit and the main plane of the mounting plate is less than a preset angle, avoiding resonance between the vibration component and the vehicle door sheet metal during vibration, thereby improving the low-frequency sound quality of the in-vehicle door speaker. The sound waveguide structure is fixedly connected to the mounting frame and is disposed within the pre-sound cavity. The distance between the sound waveguide structure and the diaphragm is greater than the maximum linear displacement during the vibration of the diaphragm. The sound waveguide structure reduces the cavity volume of the pre-sound cavity, thereby weakening the resonance peak and shifting the resonance frequency to the high frequency, weakening the influence of the pre-cavity effect on the sound quality of the low-frequency band and improving the uniformity of the low-frequency response. Description of the Drawings

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

[0029] Figure 1 Is an axonometric view of an in-vehicle door speaker module provided by the present invention;

[0030] Figure 2 Is a front view of the in-vehicle door speaker module provided by the present invention;

[0031] Figure 3 Is a cross-sectional view of the in-vehicle door speaker module provided by the present invention;

[0032] Figure 4 Is a schematic structural view of the mounting frame provided by the present invention;

[0033] Figure 5 Is a schematic structural view of the speaker unit provided by the present invention;

[0034] Figure 6 Is a schematic structural view of a sound waveguide structure provided by the present invention;

[0035] Figure 7 Is a vibration simulation test result diagram of the vehicle door sheet metal of the in-vehicle door speaker module of the prior art;

[0036] Figure 8 Is a vibration simulation test result diagram of the vehicle door sheet metal of the in-vehicle door speaker module of the present invention;

[0037] Figure 9 It is a diagram of the directivity simulation test results of the in-vehicle door speaker module of the present invention;

[0038] Figure 10 It is a comparison diagram of the frequency response curves of the in-vehicle door speaker modules of the present invention and the prior art. Detailed implementation manners

[0039] To make the technical problems solved by the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present invention.

[0040] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on the top" of the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under the bottom" of the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0042] Figure 1 It is an axonometric view of an in-vehicle door speaker module provided by the present invention, Figure 2 It is a front view of the in-vehicle door speaker module provided by the present invention, Figure 3 It is a cross-sectional view of the in-vehicle door speaker module provided by the present invention, and the section line is as Figure 1 shown by A-A' in Figure 4 It is a structural schematic diagram of the installation frame provided by the present invention, Figure 5A schematic diagram of the structure of the speaker unit provided by the present invention, as shown in Figures 1-5 As shown, the vehicle door speaker module includes a mounting frame 100 , a speaker unit 200 and a sound waveguide structure 300 .

[0043] The mounting frame 100 is mainly used to accommodate the speaker unit 200 and realize the fixed connection between the vehicle door speaker module and the door sheet metal 400. Specifically, the mounting frame 100 is provided with a mounting plate 110, and the mounting plate 110 is used to fix the vehicle door speaker module to the installation position of 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. Exemplarily, a plurality of fixing holes 112 are provided on the mounting plate 110, and the vehicle door speaker module is fixedly connected to the installation position of the door sheet metal 400 by bolts passing through the fixing holes 112.

[0044] The speaker unit 200 is fixed in the mounting frame 100. Exemplarily, the speaker unit 200 has a cone structure as a whole, and the speaker unit 200 includes a basin frame 210, a vibration component and a magnetic circuit component. The angle θ between the axis O-O' of the speaker unit 200 and the main plane 111 of the mounting plate 110 is smaller than a preset angle. Exemplarily, the angle θ is smaller than 5°. In a specific embodiment of the present invention, the angle θ may be equal to 0°. Since the angle θ between the axis O-O' of the speaker unit 200 and the main plane 111 of the mounting plate 110 is smaller than a preset angle, the vibration direction of the vibration component is very small or parallel to the door sheet metal 400, thereby avoiding resonance between the vibration component and the door sheet metal 400 when vibrating, thereby improving the low-frequency sound quality of the vehicle door speaker.

[0045] The frame 210 is a cone structure as a whole and is the main supporting structure of the speaker unit 200. The end surface of the frame 210 with a larger radial dimension is used as the end surface 211 on the sound output side of the speaker unit 200, and the end surface of the frame 210 with a smaller radial dimension is called the bottom surface. The side wall of the frame 210 can be hollowed out to reduce the weight of the frame 210. The frame 210 can generally be made of a material that is light in weight, not easy to deform, and has good heat dissipation, such as an aluminum alloy material.

[0046] The vibration assembly is disposed inside the speaker frame 210. Exemplarily, the vibration assembly includes a diaphragm (or called a speaker cone) 221, a voice coil 222, a centering washer 223, and a surround 224. The diaphragm 221 surrounds the inner circumference of the speaker frame 210, one end of which is fixedly connected to the voice coil 222, and the other end is fixedly connected to the end face 211 on the sound output side through the surround 224. The diaphragm 221 can be cone-shaped or shallow wok-shaped. Exemplarily, in the embodiments of the present invention, the cone-shaped is taken as an example for illustration. The material of the diaphragm 221 can be pulp, fiber, plastic, etc. The diaphragm 221 and the mounting frame 100 enclose a pre-sound cavity 101. The surround 224 can be annular and is arranged in a circle along the circumference of the end face 211 on the sound output side. The surround 224 can be made of cloth, natural rubber, foam, etc., and both ends are adhesively bonded to the diaphragm 221 and the end face 211 on the sound output side respectively through hot pressing. The voice coil 222 can be formed by winding a wire around a tubular skeleton. The edge of the centering washer 223 is fixed inside the speaker frame 210, and the voice coil 222 passes through the opening in the center of the centering washer 223 and is fixedly connected to the centering washer 223. The centering washer 223 and the surround 224 work together to ensure that the voice coil 222 moves along the axis O-O' of the speaker unit 200 without lateral movement. The centering washer 223 can be prepared from cotton fabric, fiber material, etc. The magnetic circuit assembly includes a magnetic bowl 231, a permanent magnet 232, and a magnetic sheet 233. The magnetic bowl 231 is arranged upside down at the bottom of the speaker frame 210, the permanent magnet 232 is at the inner bottom of the magnetic bowl 231, and the magnetic sheet 233 is arranged on the permanent magnet 232. The permanent magnet 232 and the magnetic sheet 233 form a magnetic gap with the inner wall of the magnetic bowl 231. An opening is provided at the bottom of the speaker frame 210, and the voice coil 222 passes through the opening at the bottom of the speaker frame 210 and is arranged in the magnetic gap. The permanent magnet 232 can be a magnet steel for providing a magnetic field. The magnetic bowl 231 and the magnetic sheet 233 can be prepared from magnetic materials for constraining magnetic field lines and improving the utilization rate of magnetic energy. A dust cap 225 can be sleeved on the end of the voice coil 222 away from the magnetic circuit assembly to prevent dust from falling into the voice coil 222 and generating noise during the vibration of the voice coil 222. When the speaker unit 200 is powered on, the voice coil 222 generates a magnetic field, interacts with the magnetic field of the magnetic circuit assembly, and drives the voice coil 222 to vibrate. The vibration of the voice coil 222 can further drive the diaphragm 221 to vibrate, and the vibration of the diaphragm 221 can push the air to vibrate, thereby generating sound.

[0047] The acoustic waveguide structure 300 is fixedly connected to the mounting frame 100 and is disposed in the pre-sound cavity 101. The distance between the acoustic waveguide structure 300 and the diaphragm 221 is greater than the maximum linear displacement when the diaphragm 221 vibrates, so as to avoid contact between the diaphragm 221 and the acoustic waveguide structure 300 during vibration and affect the sound production effect.

[0048] During the vibration of the diaphragm 221, the direction of the generated sound wave is not perpendicular to the axis O - O’ of the voice coil 222 movement, but towards the front - side of the central axis of the diaphragm 221. The sound waves symmetrically emitted from each part of the diaphragm 221 generate sound focusing like light focusing. The sound wave factors will collide with each other due to focusing in the front sound - emitting cavity 101, and the sound waves generated by the collision radiate towards the front central axis O - O’, forming the interference of sound waves, generating resonance, and causing the deterioration of the sound quality in the low - frequency band. This mutual interference of sound waves caused by sound focusing is called the front - cavity effect in the industry.

[0049] The function of the sound - wave guide structure 300 is to reduce the cavity volume of the front sound - emitting cavity 101, thereby weakening the resonance peak and shifting the resonance frequency (the frequency at which the resonance peak appears) towards the high - frequency range, weakening the influence of the front - cavity effect on the sound quality in the low - frequency band, and improving the uniformity of the low - frequency response.

[0050] Specifically, the relationship between the volume of the front sound - emitting cavity and the acoustic capacitance is shown by the following formula:

[0051]

[0052] where C a is the acoustic capacitance, V is the volume of the front sound - emitting cavity, ρ0 is the density of the medium (usually air), and c0 is the speed of sound in the medium. The acoustic capacitance reflects the energy storage and release characteristics of sound during propagation.

[0053] The relationship between the resonance frequency and the acoustic capacitance is shown by the following formula:

[0054]

[0055] where F P is the resonance frequency, M a is the acoustic mass, and the acoustic mass reflects the inertial characteristics of sound during propagation.

[0056] From the above, it can be seen that the acoustic capacitance is positively correlated with the volume of the front sound - emitting cavity, and the resonance frequency is inversely correlated with the acoustic capacitance. Therefore, the resonance frequency is inversely correlated with the volume of the front sound - emitting cavity, that is, the smaller the volume of the front sound - emitting cavity, the larger the resonance frequency. Therefore, by reducing the volume of the front sound - emitting cavity, the resonance frequency can be shifted towards the high - frequency range, broadening the low - frequency band range, and at the same time weakening the amplitude of the resonance peak, making the amplitude difference between the peak and valley on the frequency - response curve smaller, thereby improving the uniformity of the low - frequency response.

[0057] The vehicle-mounted door speaker module provided by the present invention comprises a mounting frame, a speaker unit and an acoustic waveguide structure. The mounting frame is provided with a mounting plate. The mounting plate is used to fix the vehicle-mounted 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. The speaker unit comprises a diaphragm. The diaphragm and the mounting frame are enclosed to form a front cavity for pronunciation. The angle between the axis of the speaker unit and the main plane of the mounting plate is less than a preset angle, so as to avoid resonance between the vibration component and the vehicle door sheet metal when vibrating, thereby improving the low-frequency sound quality of the vehicle-mounted door speaker. The acoustic waveguide structure is fixedly connected to the mounting frame and is arranged in the front cavity for pronunciation. The distance between the acoustic waveguide structure and the diaphragm is greater than the maximum linear displacement when the diaphragm vibrates. The acoustic waveguide structure reduces the cavity volume of the front cavity for pronunciation, thereby weakening the resonance peak and migrating the resonance frequency to the high frequency, weakening the influence of the front cavity effect on the sound quality of the low-frequency band, and improving the uniformity of the low-frequency response.

[0058] Figure 6 A schematic diagram of the structure of an acoustic waveguide structure provided by the present invention, referring to Figure 3 and Figure 6 In some embodiments of the present invention, the acoustic waveguide structure 300 is generally cone-shaped, and the surface close to the diaphragm 211 follows the curved shape of the diaphragm 221, thereby reducing the volume of the front cavity 101 as much as possible, weakening the influence of the front cavity effect on the low-frequency sound quality, and improving the uniformity of the low-frequency response.

[0059] In some embodiments of the present invention, reference 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, so that it has a certain ability to absorb the resonance peak, thereby weakening the resonance peak and improving the uniformity of the low-frequency response.

[0060] In some embodiments of the present invention, reference Figure 3 and Figure 6 , the end surface opening 301 of the acoustic waveguide structure 300 close to the diaphragm 221. The distance from the end surface of the acoustic waveguide structure 300 close to the diaphragm 221 to the dust cap 225 is greater than the maximum linear displacement when the diaphragm vibrates. Exemplarily, in a specific embodiment, the distance from the end surface of the acoustic waveguide structure 300 close to the diaphragm 221 to the dust cap 225 is 1.5 times the maximum linear displacement when the diaphragm vibrates.

[0061] In some embodiments of the present 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 generate sound energy consumption through the acoustic waveguide structure 300, and then, based on the viscous effect of the sound-absorbing material, the sound energy is dissipated again by friction. After the above two sound energy dissipations, the intensity of the resonance peak can be effectively reduced and the broadband sound absorption ability can be enhanced, thereby reducing the loss of the acoustic waveguide. In addition, the sound-absorbing material can also reduce the intensity of the resonance peak, reduce the air flow sound, and enhance the quantity and bass extension of the speaker at low frequencies.

[0062] In some embodiments of the present invention, referring to Figures 1-6 , the mounting frame 100 further includes an abutting portion 120, a first enclosing portion 130, and a second enclosing portion 140. The second enclosing portion 140 is disposed on the first side of the mounting plate 110, and the abutting 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 abutting portion 120 is fixed on the mounting plate 110, and the second end face of the abutting 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. Exemplarily, a buffer pad 121 is further disposed on the second end face of the abutting portion 120. The buffer pad 121 plays a buffering role between the abutting portion 120 and the door sheet metal 400, weakening the influence of the vibration of the vibration assembly 200 on the door sheet metal 400.

[0064] The first enclosing portion 130 is fixedly connected to the second end face of the abutting portion 120, and encloses an installation cavity 131 with the abutting portion 120. The speaker unit 200 is disposed in the installation cavity 131.

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

[0066] The second enclosing portion 140 closes the end face 211 on the sound-emitting side of the speaker unit 200 on the first side of the mounting plate 110 to form a pre-sound-emitting cavity 101, and at the same time plays a role in waterproofing and dustproofing.

[0067] The second end face of the abutting portion 120 is open, and encloses a sound-emitting port 201 with the end face 211 on the sound-emitting side of the speaker unit 200, and the sound-emitting port points to the door sheet metal 400.

[0068] In some embodiments of the present invention, referring to Figure 3 and Figure 6, the 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 curved surface of the acoustic waveguide structure 300 on the second side of the mounting plate 110 (i.e., on the side of the sound outlet 201) is an exponential curve, aiming to minimize the volume of the front sound cavity 101 and broaden the frequency band range of the speaker module. At the same time, it plays a role in changing the propagation direction and radiation angle of sound waves, making them face the door sheet metal 400.

[0069] In some embodiments of the present invention, referring to Figure 3 and Figure 6 , a bending portion 310 is provided on the end face of the first side of the acoustic waveguide structure 300 away from the diaphragm 221 to adapt to the surround 224. The bending portion 310 is provided for half a circumference along the circumferential direction of the first side of the acoustic waveguide structure 300. The vertex P1 of the bending portion 310 and the target point P2 of the maximum distance from the effective vibration region of the surround 224 to the end face 211 of the sound output side of the speaker unit 200 coincide in the vertical projection on the end face 211 of the sound output side of the speaker unit 200. Specifically, the effective vibration region of the surround 224 is the region that can vibrate during the vibration process, usually the region between one end of the surround 224 close to the axis O - O' and 1 / 3 of the entire surround 224. The target point P2 of the maximum distance from the effective vibration region to the end face 211 of the sound output side of the speaker unit 200 is the position at 1 / 3 of the entire surround 224 from one end of the surround 224 close to the axis O - O'. The distance between the vertex P1 of the bending portion 310 and the target point P2 is greater than the maximum linear displacement when the diaphragm 221 vibrates, avoiding contact between the surround 224 and the bending portion 310 during vibration and affecting the sound production effect.

[0070] The end of the bending portion 310 away from the mounting plate 110 is fixed between the second enclosing portion 140 and the end face 211 of the sound output side of the speaker unit 200 and extends outward from the second enclosing 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, playing a role in waterproofing and moisture protection.

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

[0072] In some embodiments of the present invention, referring to Figure 3 and Figure 6, a plurality of leakage holes 311 are provided on the bending portion 310, and the plurality of leakage holes 311 are uniformly arranged along the circumferential direction of the bending portion 310. Due to the existence of the acoustic waveguide structure 300, the sound waves generated by the vibration of the diaphragm 221 will propagate back and forth between the diaphragm 221 and the acoustic waveguide structure 300, and standing wave phenomena are likely to occur, resulting in sound quality problems such as distorted sound and uneven low-frequency response emitted by the speaker. In the present invention, a plurality of leakage holes 311 are provided on the bending portion 310, and the sound waves propagating back and forth between the diaphragm 221 and the acoustic waveguide structure 300 can be discharged through the leakage holes 311, destroying the boundary conditions for the formation of standing waves, thereby improving the sound quality. Exemplarily, in a specific embodiment of the present invention, the radius of the leakage hole 311 is 5 mm.

[0073] In some embodiments of the present invention, a damping mesh cloth is attached to the leakage hole 311 to reduce the attenuation of the speaker at low frequencies and enhance the damping in the low-frequency band.

[0074] In order to verify the effect of the in-vehicle door speaker module of the present invention, a simulation test is performed on the in-vehicle door speaker module. Specifically, the in-vehicle door speaker module is fixed to the test baffle through the mounting plate, and an excitation of 1 N is applied at the magnetic bowl. The simulation test results are as follows:

[0075] Figure 7 It is a vibration simulation test result diagram of the door sheet metal of the in-vehicle door speaker module of the prior art. Figure 8 It is a vibration simulation test result diagram of the door sheet metal of the in-vehicle door speaker module of the present invention. Refer to Figure 7 、 8 , during the operation of the in-vehicle door speaker module of the prior art, the maximum displacement that causes the door sheet metal to vibrate in the direction Y perpendicular to the door sheet metal is 9.3×10 - 4 mm. During the operation of the in-vehicle door speaker module of the present invention, the maximum displacement that causes the door sheet metal to vibrate in the direction perpendicular to the door sheet metal is 6.8×10 -6 mm, and the vibration amplitude of the door sheet metal in the direction perpendicular to the door sheet metal (i.e., the Y direction) is greatly reduced. In addition, the vibration amplitude in the plane of the door sheet metal (including the X direction and the Z direction) is also greatly reduced.

[0076] Figure 9 It is a directivity simulation test result diagram of the in-vehicle door speaker module of the present invention. The sound pressure distributions of the in-vehicle door speaker module of the present invention at 0°, 30°, 45°, and 60° with respect to the axis direction O-O' are tested. As Figure 9 shown, the sound pressure distributions of the in-vehicle door speaker module of the present invention in all directions at medium and low frequencies (within 1000 Hz) are almost the same, that is, the medium and low-frequency directivity is uniform.

[0077] Figure 10The frequency response curve comparison diagram of the vehicle door speaker module of the present invention and the prior art is as follows: Figure 10 As shown in the figure, the frequency response curve of the vehicle door speaker module of the prior art begins to decay at around 700Hz and has an obvious resonance peak with a peak value of 96db. The frequency response curve of the vehicle door speaker module of the present invention has a resonance peak disappearing at around 700Hz. Accordingly, the frequency of the resonance peak migrates to high frequency to around 950Hz, widening the frequency band to 1300Hz, and the peak value of the resonance peak is reduced to 90db, which significantly improves the uniformity of the low-frequency response and achieves a broadband sound absorption effect.

[0078] The present invention further provides a vehicle-mounted audio system, comprising the vehicle-mounted door speaker module provided by any of the aforementioned embodiments of the present invention.

[0079] The present invention further provides a vehicle, comprising the vehicle audio system provided by the aforementioned embodiment of the present invention.

[0080] In the description of this article, it is necessary to understand that the terms "up", "down", "left", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0081] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0082] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0083] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A vehicle door speaker module, characterized in that: include: A mounting frame, wherein the mounting frame is provided with a mounting plate, wherein the mounting plate is used to fix the vehicle door speaker module to the mounting position of the vehicle door sheet metal, and the main plane of the mounting plate is parallel to the plane where the mounting position is located; A speaker unit, wherein the speaker unit is fixed in the mounting frame, the speaker unit comprises a diaphragm, the diaphragm and the mounting frame enclose a front cavity for sound production, and the angle between the axis of the speaker unit and the main plane of the mounting plate is less than a preset angle; An acoustic waveguide structure, wherein the acoustic waveguide structure is fixedly connected to the mounting frame and is disposed in the front cavity of the pronunciation, and the distance between the acoustic waveguide structure and the diaphragm is greater than the maximum linear displacement of the diaphragm when the diaphragm vibrates.

2. The vehicle door speaker module according to claim 1, characterized in that: The acoustic waveguide structure is in a cone shape.

3. The vehicle door speaker module according to claim 2, characterized in that: The acoustic waveguide structure is a hollow structure.

4. The vehicle door speaker module according to claim 3, characterized in that: The acoustic waveguide structure opens close to the end surface of the diaphragm.

5. The vehicle door speaker module according to claim 3, characterized in that: The interior of the acoustic waveguide structure is filled with sound absorbing material.

6. The vehicle door speaker module according to any one of claims 1 to 5, characterized in that: The mounting frame further comprises an abutting portion, a first enclosing portion and a second enclosing portion, wherein the second enclosing portion is arranged on a first side of the mounting plate, and the abutting portion is arranged on a second side of the mounting plate opposite to the first side; The first end surface of the abutting portion is fixed to the mounting plate, the second end surface of the abutting portion is used to abut against the plane where the mounting position is located, and the first end surface and the second end surface are opposite end surfaces; The first enclosing portion is fixedly connected to the second end surface of the abutting portion, and encloses the abutting portion to form a mounting cavity, and the speaker unit is disposed in the mounting cavity; The end surface of the speaker unit on the sound output side is fixed to the first enclosure and the second enclosure; The second enclosure portion is sealed with the end surface of the speaker unit on the first side of the mounting plate at the sound output side; The second end surface of the abutting portion is open and is surrounded by the end surface of the speaker unit on the sound output side to form a sound output port.

7. The vehicle door speaker module according to claim 6, characterized in that: The shape of the acoustic waveguide structure located on the first side of the mounting plate follows the diaphragm, and the shape of the acoustic waveguide structure located on the second side of the mounting plate is a parabola.

8. The vehicle door speaker module according to claim 7, characterized in that: The first side of the acoustic waveguide structure is provided with a bending portion on the folding ring adapted to the end surface of the diaphragm away from the diaphragm, the vertex of the bending portion and a target point of the maximum distance to the end surface of the sound output side of the speaker unit in the effective vibration area of ​​the folding ring coincide with the vertical projection of the end surface of the sound output side of the speaker unit, and the distance between the vertex of the bending portion and the target point is greater than the maximum linear displacement of the diaphragm when the diaphragm vibrates; The end of the bent portion away from the mounting plate is fixed between the second enclosure and the end surface of the speaker unit on the sound output side, and extends outward of the second enclosure to form an extension portion, and the extension portion extends to the bottom of the speaker unit; An end surface of the second side of the acoustic waveguide structure away from the diaphragm is fixed on the abutting portion.

9. The vehicle door speaker module according to claim 8, characterized in that: A plurality of leakage holes are arranged on the bending portion.

10. The vehicle door speaker module according to claim 9, characterized in that: A damping mesh is attached to the leakage hole.

11. A vehicle audio system, characterized in that: It comprises the vehicle door speaker module as described in any one of claims 1-10.

12. A vehicle, characterized in that: Comprising the vehicle audio system as claimed in claim 11.

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