Protective cover of loudspeaker, vehicle-mounted sound production device, vehicle-mounted pedestrian warning device, and vehicle-mounted warning system

Abstract

Provided are a protective cover (3) of a loudspeaker, a vehicle-mounted sound production device (100), a vehicle-mounted pedestrian warning device, and a vehicle-mounted warning system. The vehicle-mounted sound production device (100) comprises a housing (1), a loudspeaker (2) mounted in the housing (1), and a protective cover (3) covering the outer side of the loudspeaker (2). The loudspeaker (2) has a vibration axis (Z0), and a diaphragm (21) of the loudspeaker (2) vibrates along the vibration axis (Z0) to produce sound; the protective cover (3) comprises a main body portion (32) and a surround (31) around the main body portion (32), and the main body portion (32) is provided with a sound transmission hole running through the main body portion (32) from inside to outside; the main body portion (32) has an inner side surface (321) opposite to the diaphragm (21), and the main body portion (32) comprises a phase plug (33) extending outwards from the inner side surface (321); in the cross section of the protective cover (3) along the vibration axis (Z0), the contour of an outer side surface (330) of the phase plug (33) comprises a curve having the middle arched outwards, and the width of the phase plug (33) gradually decreases from inside to outside along the vibration axis (Z0); and the protective cover (3) has a sound diffusion space (36) defined by the outer side surface (330) of the phase plug (33) and the surround (31). The vehicle-mounted sound production device (100) improves medium-frequency sensitivity, and can serve as a pedestrian warning device and whistling horn of a vehicle.

Description

Speaker protective covers, vehicle-mounted sound devices, vehicle-mounted pedestrian warning devices and vehicle-mounted warning systems Related applications

[0001] This application claims priority to Chinese patent application No. CN 2024105580416, filed on May 8, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to a speaker cover, a vehicle-mounted sound-generating device, a vehicle-mounted pedestrian warning device, and a vehicle-mounted warning system. Background Technology

[0003] With the development of science and technology and the increasing awareness of environmental protection, new energy vehicles will inevitably become a new development trend in the automotive industry. For new energy vehicles, such as electric vehicles, because they do not use internal combustion engines, they are quite quiet at low speeds. When a car is driving behind a pedestrian, the pedestrian often cannot notice its presence, increasing the probability of accidents. Therefore, pedestrian warning devices are an indispensable part of new energy vehicles. However, because these devices are directly exposed to the outside of the vehicle, they are easily affected by external environmental factors. For example, patent CN208585167U discloses a pedestrian warning device with a mesh cover, which can protect the internal components of the pedestrian warning device without affecting its performance. However, the sound reproduction effect of existing pedestrian warning devices in the mid-to-high frequency range still has room for improvement, and its performance needs to be optimized. Summary of the Invention

[0004] This invention relates to a speaker protective cover, a vehicle-mounted sound-generating device, a vehicle-mounted pedestrian warning device, and a vehicle-mounted warning system. The protective cover helps to improve the mid-frequency sensitivity of the speaker, and the vehicle-mounted sound-generating device with the protective cover can also function as a vehicle's pedestrian warning device and horn.

[0005] The first aspect of this disclosure provides a speaker protective cover for covering the outside of the speaker, the protective cover including a main body and a suspension edge surrounding the main body, the main body having a sound-transmitting hole extending through it from the inside to the outside;

[0006] The main body has an inner surface configured to face the diaphragm of the loudspeaker, and the main body includes a phase cone extending outward from the inner surface; in a cross section of the protective cover along the vibration axis of the loudspeaker, the outline of the outer surface of the phase cone includes a curve that arches outward from the middle, and the width of the phase cone gradually decreases from the inside to the outside along the vibration axis;

[0007] The protective cover has a sound diffusion space defined by the outer surface of the phase cone and the suspension edge.

[0008] In one embodiment, the phase cone includes a central phase cone extending outward from the inner surface and one or more annular phase cones, the annular phase cones surrounding the central phase cone, and the central phase cone and the annular phase cones being spaced apart to form a sound-permeable channel.

[0009] In one embodiment, in a cross-section of the protective cover along the vibration axis of the loudspeaker, the outline of the outer surfaces of the central phase cone and the annular phase cone includes a curve that arches outward from the center, and the width of the phase cone gradually decreases from the inside to the outside along the vibration axis.

[0010] In one embodiment, the shape of the outer surface contours of the central phase cone and the annular phase cone comprises a sinusoidal waveform.

[0011] In one embodiment, there are multiple annular phase cones. From a top view, the multiple annular phase cones are concentric rings and spaced apart from the inside to the outside along the radial direction of the main body. Another sound transmission channel is formed between adjacent annular phase cones.

[0012] In one embodiment, in the cross section, each of the phase cones has a vertex farthest from the diaphragm of the loudspeaker and a base point closest to the diaphragm, and the line connecting the vertex and the base point forms a half-cone angle with the vibration axis, wherein the half-cone angle of the annular phase cone is smaller than the half-cone angle of the central phase cone.

[0013] In one embodiment, the half-cone angle of the central phase cone is 41 to 70 degrees, and the half-cone angle of the annular phase cone is 15 to 40 degrees.

[0014] In one embodiment, the main body includes multiple rows of ribs spaced apart along the circumference of the main body, the annular phase cone and the central phase cone are connected by the ribs, adjacent annular phase cones are connected by the ribs, and the ribs are located in the sound transmission channel.

[0015] In one embodiment, the phase cone is formed by a front cover and a rear cover, and the phase cone has a cavity between the front cover and the rear cover. This design facilitates injection molding and improves injection molding yield while enhancing the mid-frequency sensitivity of the speaker. It solves the following problems: The protective cover has a large thickness difference, and during demolding and cooling, the plastic parts shrink, resulting in a large difference in shrinkage between different parts of the protective cover. In particular, the peak of the phase cone is thicker, and its shrinkage is significantly greater than that of other thinner parts. This leads to a large difference between the final molded protective cover and the design shape, failing to meet design requirements, resulting in a low yield and making injection molding difficult. This speaker's protective cover uses a phase cone structure. While improving the mid-frequency sensitivity of the speaker, the phase cone structure is a hollow structure formed by two thin-walled covers, avoiding the problem of large differences in shrinkage during demolding and cooling caused by the large thickness difference. The final molded protective cover conforms to the design shape and meets design requirements, thus facilitating injection molding and improving injection molding yield.

[0016] In one embodiment, one of the front cover and the rear cover is provided with a positioning post, and the other is provided with a positioning hole, wherein the positioning post is inserted into the positioning hole.

[0017] In one embodiment, the front cover and the rear cover are injection-molded plastic parts, and the front cover and the rear cover are connected to each other after molding to enclose and form the cavity.

[0018] In one embodiment, the phase cone includes a central phase cone and one or more annular phase cones, the annular phase cones surrounding the central phase cone, and the central phase cone and the annular phase cones being spaced apart to form a sound-permeable channel; a single front cover and a single rear cover enclose the central phase cone and the annular phase cone.

[0019] In one embodiment, the front cover has a crest and a trough corresponding to the phase cone, the rear cover has a cone-shaped wall in the shape of a truncated cone, the trough and the cone-shaped wall are connected, and the sound transmission channel is opened on the trough and the cone-shaped wall and passes through the trough and the cone-shaped wall in the front-back direction.

[0020] In one embodiment, the rear cover further includes a limiting protrusion extending forward from the conical wall, and a limiting notch is provided on the trough portion, with a portion of the limiting protrusion inserted into the limiting notch, or the trough portion being restricted between at least two of the limiting protrusions.

[0021] In one embodiment, the thickness difference between the crest, the trough and the conical wall is less than 25% of the thickness of the conical wall; the rear cover also has a spherical wall corresponding to the spherical top of the speaker diaphragm, the outer edge of the spherical wall is connected to the conical wall, the middle of the spherical wall is arched upward, and the thickness of the spherical wall is less than or equal to that of the conical wall.

[0022] In one embodiment, the main body is composed of a front cover and a rear cover bonded together, with the inner surface located on the rear cover and the outer surface located on the front cover; the front cover is provided with a buckle for connecting the speaker housing.

[0023] A second aspect of the present invention relates to a vehicle-mounted sound-generating device, comprising a housing, a speaker mounted in the housing, and a protective cover covering the outside of the speaker, the speaker having a vibration axis, the speaker diaphragm vibrating along the vibration axis to generate sound; the protective cover comprising a main body and a suspension edge surrounding the main body, the main body having a sound-transmitting hole extending through it from the inside to the outside;

[0024] The main body has an inner surface opposite to the diaphragm, and the main body includes a phase cone extending outward from the inner surface; in a cross section of the protective cover along the vibration axis, the outline of the outer surface of the phase cone includes a curve that arches outward from the middle, and the width of the phase cone gradually decreases from the inside to the outside along the vibration axis.

[0025] The protective cover has a sound diffusion space defined by the outer surface of the phase cone and the suspension edge.

[0026] In one embodiment, in the cross section, the phase cone has a vertex farthest from the diaphragm and a base point closest to the diaphragm, and the line connecting the vertex and the base point forms a semi-cone angle with the vibration axis, the semi-cone angle being 30 to 70 degrees.

[0027] In one embodiment, the phase cone includes a central phase cone located outside the center portion of the diaphragm, and the shape of the outer surface of the central phase cone includes a sine wave.

[0028] In one embodiment, the half-cone angle of the central phase cone is 35 to 70 degrees. More preferably, the half-cone angle of the central phase cone is 35 to 50 degrees. Further, the half-cone angle of the central phase cone is 38 to 45 degrees.

[0029] In one embodiment, the phase cone further includes an annular phase cone disposed around the central phase cone, the annular phase cone and the central phase cone being spaced apart, and the sound-permeable hole including a sound-permeable channel located between the central phase cone and the annular phase cone.

[0030] In one embodiment, the half-cone angle of the annular phase cone is smaller than the half-cone angle of the central phase cone.

[0031] In one embodiment, the half-cone angle of the annular phase cone is 30-42 degrees. More preferably, the half-cone angle of the annular phase cone is 30-40 degrees. Further, the half-cone angle of the annular phase cone is 30-37 degrees.

[0032] In one embodiment, there are multiple annular phase cones. From a top view, the multiple annular phase cones are concentric rings and spaced apart from the inside to the outside along the radial direction of the main body. The sound-permeable hole also includes a sound-permeable channel located between adjacent annular phase cones.

[0033] In one embodiment, the main body includes multiple rows of ribs spaced apart along the circumference of the main body, the annular phase cone and the central phase cone are connected by the ribs, adjacent annular phase cones are connected by the ribs, and the ribs are located in the sound transmission channel.

[0034] In one embodiment, the thickness of the rib is less than the height of the phase cone.

[0035] In one embodiment, the half-cone angle of any of the annular phase cones is smaller than the half-cone angle of the annular phase cones outside it.

[0036] In one embodiment, the protective cover is located above the speaker, and the apex of the phase cone is lower than the upper edge of the overhang.

[0037] In one embodiment, the inner surface of the protective cover has a conical surface that gradually slopes downward from the outside to the inside and a plane or an upwardly arched spherical surface that is surrounded by the conical surface and interacts with the middle of the diaphragm.

[0038] In one embodiment, a limiting post is provided inside the housing, the limiting post being located inside the diaphragm and being able to contact the diaphragm after the diaphragm is compressed.

[0039] A third aspect of the invention relates to a vehicle-mounted pedestrian warning device, including the aforementioned vehicle-mounted sound-emitting device.

[0040] A fourth aspect of the present invention relates to a vehicle-mounted warning system, comprising a pedestrian warning device and a horn for playing sound outside the vehicle compartment, wherein the pedestrian warning device and the horn share the vehicle-mounted sound-emitting device.

[0041] Specifically, the vehicle warning system includes a single vehicle-mounted sound device, which includes the aforementioned protective cover, or the vehicle-mounted sound device is the aforementioned vehicle-mounted sound device; the vehicle-mounted sound device has a first operating mode and a second operating mode. In the first operating mode, the vehicle-mounted sound device is configured to emit a pedestrian warning sound simulating the sound of a car engine to pedestrians; in the second operating mode, the vehicle-mounted sound device is configured to emit a horn sound in response to a horn command or horn signal.

[0042] The vehicle-mounted sound generator of the present invention employs a protective cover with a phase cone. Its pointed protrusion structure alters the airflow direction, reduces the path difference between different parts of the diaphragm and the sound outlet, and changes the entire sound field, generating sound wave resonance in the sound diffusion cavity. This corrects the phase and reflection angle of the sound wave, shortens the propagation time of the sound wave in the protective cover, and widens the diffusion angle of mid-to-high frequency signals, allowing mid-to-high frequency sound waves to travel in a wider space. In addition, it reduces airflow interference and effectively improves sensitivity, with sensitivity at specific mid-to-high frequencies increasing by approximately 10 dB. Attached Figure Description

[0043] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 is a structural diagram of a vehicle-mounted sound-generating device according to an embodiment of the present invention.

[0045] Figure 2 is an exploded view of a vehicle-mounted sound-generating device according to an embodiment of the present invention.

[0046] Figure 3 is a top view of a vehicle-mounted sound-generating device according to an embodiment of the present invention.

[0047] Figure 4 is a cross-sectional view along direction AA in Figure 3.

[0048] Figure 5 is a perspective view of a protective cover according to an embodiment of the present invention.

[0049] Figure 6 is a side view of a protective cover according to an embodiment of the present invention.

[0050] Figure 7 is a magnified view of part B in Figure 6.

[0051] Figure 8 is a top view of a protective cover according to an embodiment of the present invention.

[0052] Figure 9 is a cross-sectional view along the CC direction in Figure 8.

[0053] Figure 10 is a schematic diagram of half of the protective cover according to an embodiment of the present invention.

[0054] Figure 11 is a frequency response curve of a vehicle-mounted sound-generating device according to an embodiment of the present invention and a pedestrian warning device in comparison.

[0055] Figure 12 is a frequency response curve of three vehicle-mounted sound generating devices according to embodiments of the present invention.

[0056] Figure 13 is a side view of another speaker cover according to an embodiment of the present invention.

[0057] Figure 14 is an exploded view of the protective cover shown in Figure 13.

[0058] Figure 15 is a cross-sectional view of the protective cover shown in Figure 13.

[0059] Figure 16 is a magnified view of part A in Figure 15.

[0060] In the above attached figures,

[0061] 100. Vehicle-mounted sound device;

[0062] 1. Housing; 11. Upper housing; 12. Lower housing; 13. Limiting post; 14. Through hole; 15. Stepped hole; 101. Sound cavity; 102. Mounting groove;

[0063] 2. Loudspeaker; 21. Diaphragm; 211. Cone; 212. Dome; 22. Voice coil; 23. Magnetic circuit assembly; 231. Front panel; 2311. Hole; 24. Positioning support;

[0064] 3. Protective cover; 31. Suspension edge; 32. Main body; 321. Inner surface; 321a. Conical surface; 321b. Spherical surface; 33. Phase cone; 330. Outer surface; 331. Central phase cone; 332. Annular phase cone; 34. Sound transmission channel; 35. Ribs; 36. Sound diffusion space;

[0065] 301. Front cover; 3011. Crest; 3012. Trough; 302. Rear cover; 3021. Conical wall; 3022. Spherical wall; 303. Cavity; 304. Positioning post; 305. Positioning hole; 306. Limiting protrusion; 307. Limiting notch; 308. Buckle. Detailed Implementation

[0066] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0067] In this article, "inner" and "outer" are defined with reference to the loudspeaker, with the position closer to the loudspeaker being considered inner and vice versa. The directional terms "upper," "lower," and "horizontal" are intended to help those skilled in the art understand the structure of the vehicle-mounted sound device and are not used to limit the state of the vehicle-mounted sound device after it is installed in the usage scenario. For example, the vehicle-mounted sound device can be installed on a horizontal, inclined, or vertical surface of a vehicle.

[0068] This embodiment provides a sound-emitting device, particularly a vehicle-mounted sound-emitting device, for emitting warning sounds to the outside of the vehicle. Specifically, the vehicle-mounted sound-emitting device is installed on the vehicle, specifically on the outside of the passenger compartment, for radiating sound outwards. The vehicle is typically a battery-powered new energy vehicle, including electric vehicles.

[0069] Referring to Figures 1 to 4, the vehicle-mounted sound device 100 mainly includes a housing 1, a speaker 2, and a protective cover 3. The speaker 2 is mounted in the housing 1, and the protective cover 3 is fixed to the housing 1 and covers the outside of the speaker 2 to provide protection. Taking the orientation shown in the figures as an example, the housing 1 includes an upper shell 11 and a lower shell 12 connected to each other, forming a sound cavity 101 between the upper shell 11 and the lower shell 12. The middle of the upper shell 11 is recessed downwards to form a generally conical mounting groove 102. The speaker 2 is disposed in the mounting groove 102, and the speaker 2 does not require additional support structures such as a frame or bracket. The diaphragm 21, magnetic circuit assembly 23, and positioning support 24 of the speaker 2 are directly fixed to the upper shell 11 and supported by the upper shell 11. The protective cover 3 is fixed to the upper shell 11, and the speaker 2 is sandwiched between the protective cover 3 and the upper shell 11.

[0070] Specifically, as shown in Figures 2 and 4, the upper shell 11 has multiple upwardly extending limiting posts 13. In the initial or normal operating state, the diaphragm 21 of the sound-generating device 100 is positioned a distance above the limiting posts 13, without contact between them. However, when the pressure on the diaphragm 21 exceeds a set threshold, the diaphragm 21 deforms downwards and comes into contact with the limiting posts 13. The limiting posts 13 prevent excessive deformation of the diaphragm 21 under pressure, which could damage the diaphragm 21 and its connected voice coil 22. In actual use, especially during heavy rain when excessive rainwater enters the diaphragm 21, increasing the pressure on it, the limiting posts 13 prevent excessive deformation of the diaphragm 21, which could damage the components of the speaker 2.

[0071] Further, as shown in Figure 2, the outer edge of the diaphragm 21 is fixed to the edge of the upper shell 11 and sandwiched between the edges of the upper shell 11 and the protective cover 3. The upper shell 11 has multiple through holes 14 to connect the spaces inside and outside the shell 1, specifically connecting the sound cavity 101 and the mounting groove 102. A stepped hole 15 is formed in the middle of the upper shell 11, in which the magnetic circuit assembly 23 is installed. This stepped hole 15 has multiple horizontal stepped surfaces. The outer edge of the positioning support 24 is fixed to one of these stepped surfaces.

[0072] As shown in Figure 4, the loudspeaker 2 has a vibration axis Z0, and the diaphragm 21 of the loudspeaker 2 vibrates along the vibration axis Z0 to produce sound. This vibration axis Z0 coincides with the center line of the voice coil 22. The magnetic circuit assembly 23, the voice coil 22, and the diaphragm 21 are arranged sequentially from the inside to the outside along the vibration axis Z0, and a positioning support 24 is fitted onto the voice coil 22. A through hole is formed in the middle of the front piece of the magnetic circuit assembly 23 to facilitate glue overflow during the bonding of the magnetic circuit assembly 23. In this embodiment, the diaphragm 21 has a cone 211 and a dome 212 located in the middle of the cone 211. The dome 212 is the central part of the diaphragm 21, and the cone 211 surrounds the dome 212. The diaphragm 21, its cone 211, and its dome 212 are all bodies of rotation with the aforementioned vibration axis Z0 as their center of rotation. In some other embodiments, the central part of the diaphragm 21 can be a central through hole or a flat plate.

[0073] Referring to Figures 5 to 10, the protective cover 3 includes a main body 32 and a surrounding edge 31. The main body 32 has a sound-permeable hole that extends from the inside to the outside. The surrounding edge 31 is fixed to the edge of the upper shell 11 and the outer edge of the diaphragm 21. The main body 32 is positioned corresponding to the sound-emitting part of the diaphragm 21, providing protection and assisting in sound diffusion.

[0074] The main body 32 has an inner surface 321 opposite to the diaphragm 21. The shape of this inner surface 321 is consistent with the upper surface of the diaphragm 21, and the distance between them along the vibration axis Z0 is substantially equal everywhere. The inner surface 321 of the protective cover 3 has a conical surface 321a, which gradually slopes downward from the outside to the inside, and the middle part enclosed by the conical surface 321a corresponds to and fits the center part of the diaphragm 21. In this embodiment, the middle part surrounded by the conical surface 321a is an upwardly arched spherical surface 321b that fits with the dome 212 of the diaphragm 21. In other embodiments, the middle part surrounded by the conical surface 321a is a plane.

[0075] The main body 32 includes one or more phase cones 33 extending outward from the inner surface 321. In a cross-section of the protective cover 3 along the vibration axis Z0, the profile of the outer surface 330 of the phase cone 33 includes a curve that arches outward from the center, and the width of the phase cone 33 gradually decreases from the inside to the outside along the vibration axis Z0. The protective cover 3 has a sound diffusion space 36 defined by the outer surface 330 of the phase cone 33 and the suspension edge 31.

[0076] Phase cone 33 includes a central phase cone 331, which is disposed on the outer side of the center of diaphragm 21. In the above cross-section, the central phase cone 331 is an axisymmetric figure about the vibration axis Z0. Preferably, the shape of the outline of the outer surface 330 of the central phase cone 331 includes a sine wave. Phase cone 33 also includes an annular phase cone 332, which is annular. It should also be noted that, referring to Figures 9 and 10, in the above cross-section, each annular phase cone 332 is formed by the outline (part of a sine wave) of its respective outer surface 330 (the upper surface in Figure 10) and the outline (diagonal line) of its inner surface 321 (the lower surface in Figure 10). In the above cross-section, phase cone 33 has a vertex P1 farthest from diaphragm 21 and a base P2 closest to diaphragm 21, and the line connecting vertex P1 and base P2 forms a half-cone angle with the vibration axis Z0, the half-cone angle being 30 to 70 degrees.

[0077] In this embodiment, the phase cone 33 includes a central phase cone 331 and a plurality of annular phase cones 332. The half-cone angle of the central phase cone 331 is 35-70 degrees, preferably 35-50 degrees. The half-cone angle of the annular phase cones 332 is smaller than that of the central phase cone 331. The half-cone angle of the annular phase cones 332 is 30-42 degrees. There are a plurality of annular phase cones 332, which, in a top view, are concentric rings and spaced apart from the inside to the outside along the radial direction of the main body 32. The half-cone angle of any one annular phase cone 332 is smaller than that of the annular phase cone 332 outside it.

[0078] Specifically, in the embodiment shown in the attached figures, three annular phase cones 332 are spaced apart around the central phase cone 331. Referring to Figure 10, Z0 represents the vibration axis of the loudspeaker 2, and Z1, Z2, and Z3 are the center lines of the three annular phase cones 332, respectively. Z1, Z2, and Z3 are all parallel to Z0. The central phase cone 331 is symmetrical about the vibration axis Z0. The central phase cone 331 has a vertex P1 that falls on the vibration axis Z0 and two base points P2 that fall on the inner surface 321 of the protective cover 3. The angle α0 between the line connecting P1 and P2 and the vibration axis Z0 is the half-cone angle of the central phase cone 331, which is approximately 47 degrees. Each annular phase cone 332 has a top vertex and a base point P2 that falls on the inner surface 321 of the protective cover 3; the angles α1, α2, and α3 between P1 and P2 and the axis Z1, Z2, or Z3 are the half-cone angles of the three annular phase cones 332 from the inside to the outside, and the half-cone angles of the three annular phase cones 332 from the inside to the outside are 30 degrees, 35 degrees, and 39 degrees, respectively.

[0079] The central phase cone 331 and the annular phase cone 332, as well as each annular phase cone 332, are spaced apart from each other. The aforementioned sound-permeable holes include sound-permeable channels 34 located between the central phase cone 331 and the annular phase cones 332, and sound-permeable channels located between adjacent annular phase cones 332. As shown in Figure 7, the sound-permeable channel 34 is an annular slit-shaped channel. In addition to the aforementioned sound-permeable channels 34, the conical surface 321a of the inner surface 321 of the protective cover 3 is a continuous surface.

[0080] The main body 32 includes multiple rows of ribs 35 spaced apart along the circumference of the main body 32. The annular phase cones 332 and the central phase cone 331 are connected by the ribs 35, and adjacent annular phase cones 332 are connected by the ribs 35. The ribs 35 are located in the sound transmission channel 34. The thickness of the ribs 35 is less than the height of the phase cones 33. Further, the thickness of the ribs 35 is preferably less than 1 / 4 of the height of the central phase cone 331.

[0081] The protective cover 3 is located above the speaker 2. As shown in Figures 6 and 9, the apex of the phase cone 33 is lower than the upper edge of the suspension edge 31. As shown in Figure 9, the sound diffusion space 36 is the space between adjacent phase cones 33 and the space between the outermost annular phase cone 332 and the suspension edge 31.

[0082] This embodiment also provides a vehicle-mounted pedestrian warning device, which uses the aforementioned sound-emitting device 100. This vehicle-mounted pedestrian warning device can simulate a sound similar to a traditional vehicle engine based on the vehicle's current speed, gear, and other information, and project this sound towards pedestrians outside the vehicle, thereby alerting them to the vehicle's current status.

[0083] This embodiment also provides a vehicle-mounted warning system, specifically an external vehicle warning system. This vehicle-mounted warning system can play pedestrian warning sounds and horn sounds. The system includes a pedestrian warning device and a horn for playing sounds outside the vehicle, sharing a single vehicle-mounted sound-emitting device 100. The device 100 has a first operating mode and a second operating mode. In the first operating mode, the device 100 is configured to emit a pedestrian warning sound simulating a car engine sound to alert pedestrians that a vehicle is approaching. In the second operating mode, the device 100 is configured to emit a sharp horn sound in response to a horn command or signal to alert pedestrians to avoid the approaching vehicle.

[0084] Performance Testing: The pedestrian warning device disclosed in patent CN208585167U was used as a comparative example. Sound effect tests were conducted on the sound-generating device 100 shown in Figures 1 to 10 and the pedestrian warning device of the comparative example under the same specifications and test conditions. The frequency response curves of the two are compared in Figure 11. As can be seen from Figure 11, in the 1kHz~4kHz frequency band, the average sensitivity of the frequency response curve of the embodiment is about 10dB higher than that of the comparative example.

[0085] The principle of the sound-generating device 100 in this embodiment is as follows: Utilizing a throat-plug type mesh structure, the structure of the central throat plug and the phase cone 33 with its pointed protrusion embedded in the middle structure of the entire mesh alters the airflow direction, thus changing the entire sound field. The functions of the phase cone 33 are: 1. To correct the phase and reflection angle, shortening the time and widening the diffusion angle of mid-to-high frequency signals, allowing mid-to-high frequency sound waves to propagate in a wider space. 2. To reduce airflow interference and effectively improve sensitivity.

[0086] The Influence of Half-Cone Angle on Sound Performance: The taper of the phase cone 33, especially the central phase cone 331, has a significant impact on the sound performance of the sound-generating device 100. The inventors conducted parallel experiments, in which three sound-generating devices 100 differed only in the half-cone angle of the central phase cone 331; all other structures were identical. The frequency response curves of the three devices are compared in Figure 12. In Figure 12, curves 1, 2, and 3 represent the frequency response curves of samples 1, 2, and 3 of the sound-generating device 100, respectively. The half-cone angles of the central phase cone 331 of samples 1, 2, and 3 are 40 degrees, 45 degrees, and 35 degrees, respectively. As shown in Figure 12, the frequency response curve of sample 1 in the 1000~4000Hz frequency band is significantly higher than that of samples 2 and 3. Furthermore, all three samples meet regulatory requirements. The regulatory requirement is a frequency response greater than 87dB in the 1800~3550Hz range. In practical applications, a suitable semi-cone angle should be selected, taking into account the aesthetics of the shape, the frequency response curve, and the air space reserved for the warning device in the vehicle.

[0087] Figures 13 to 16 show another protective cover 3 for a speaker according to this embodiment, which is used in the vehicle-mounted sound-generating device 100 shown in Figures 1 and 2. The protective cover is identical to the one used in this embodiment, except for the housing 1 and the speaker 2. The protective cover 3 is a plastic part, typically manufactured using injection molding. In this embodiment, the protective cover 3 is assembled from multiple parts, employing a modular structure. Each part is injection molded separately and then assembled together, using connection methods including but not limited to adhesive bonding, snap-fit ​​connections, and fastener connections.

[0088] The phase cone 33 is formed by the front cover 301 and the rear cover 302, and has a cavity 303 located between the front cover 301 and the rear cover 302. The front cover 301 is located in front of the rear cover 302, that is, after being assembled into the vehicle warning device, the rear cover 302 is located between the front cover 301 and the diaphragm 21 of the speaker 2. Both the front cover 301 and the rear cover 302 are thin-walled structures with relatively uniform overall thickness. The front cover 301 and the rear cover 302 are injection molded separately and then joined together, thereby solving the problem of different shrinkage amounts in different parts caused by demolding and cooling during the injection molding process. Furthermore, the protective cover 3 as a whole is composed of the front cover 301 and the rear cover 302. A single front cover 301 and a single rear cover 302 enclose each phase cone 33, namely the aforementioned central phase cone 331 and annular phase cone 332, each phase cone 33 having a cavity 303 enclosed by the single front cover 301 and the single rear cover 302.

[0089] One of the front cover 301 and the rear cover 302 is provided with a positioning post 304, and the other is provided with a positioning hole 305. The positioning post 304 is inserted into the positioning hole 305. Specifically, in this embodiment, the rear cover 302 has a plurality of forward-extending positioning posts 304 spaced apart, and the front cover 301 has corresponding positioning holes 305. The positioning posts 304 are inserted into the positioning holes 305 to ensure precise alignment of the front cover 301 and the rear cover 302 when they are joined.

[0090] The front cover 301 has a crest portion 3011 and a trough portion 3012 corresponding to the phase cone 33. The rear cover 302 has a cone-shaped wall 3021 in the shape of a truncated cone. The trough portion 3012 and the cone-shaped wall 3021 are in contact (and can be further bonded with adhesive). The sound transmission channel 34 is formed on the trough portion 3012 and the cone-shaped wall 3021 and extends through the trough portion 3012 and the cone-shaped wall 3021 in the front-back direction. The rear cover 302 also includes a limiting protrusion 306 extending forward from the cone-shaped wall 3021. The trough portion 3012 is provided with a limiting notch 307. A portion of the limiting protrusion 306 is inserted into the limiting notch 307 and can be bonded with adhesive. Furthermore, there are multiple limiting protrusions 306, and the trough portion 3012 is confined between at least two limiting protrusions 306 to ensure precise alignment when the front cover 301 and the rear cover 302 are assembled. Specifically, in this embodiment, when viewed along the vibration axis, the limiting protrusions 306 are annular, with multiple rings of limiting protrusions 306 arranged around the vibration axis in a concentric ring shape.

[0091] The thickness difference between the crest portion 3011, the trough portion 3012, and the conical wall 3021 is less than 25% of the thickness of the conical wall 3021; ​​ideally, this thickness difference is 0. The rear enclosure 302 also has a spherical shell-shaped wall 3022 corresponding to the spherical top of the speaker diaphragm. The outer edge of the spherical shell-shaped wall 3022 is connected to the conical wall 3021, and the middle of the spherical shell-shaped wall 3022 arches upwards. The thickness of the spherical shell-shaped wall 3022 is less than or equal to that of the conical wall 3021. The center phase cone 33 is formed by the spherical shell-shaped wall 3022 and the middle of the front enclosure 301. The aforementioned cone surface is the rear surface of the conical wall 3021, the aforementioned inner surface is the rear surface of the entire rear enclosure 302 (the rear surfaces of the conical wall 3021 and the spherical shell-shaped wall 3022), and the aforementioned outer surface is the front surface of the middle of the front enclosure 301. The outer edge of the front cover 301 is the aforementioned overhang 31, and multiple buckles 308 for connecting with the housing 1 are provided on the outer edge of the front cover 301.

[0092] While retaining the advantages of the diffuser shown in Figures 1 to 10, the phase cone structure is a hollow structure formed by two thin-walled covers, which avoids the problem of large differences in demolding cooling shrinkage caused by large thickness differences. The final molded protective cover conforms to the design shape and meets the design requirements, thereby facilitating injection molding and improving the injection molding yield.

[0093] Features of the embodiments of this disclosure are set forth in the following terms:

[0094] Clause 1. A vehicle-mounted sound device, comprising a housing, a speaker mounted in the housing, and a protective cover covering the outside of the speaker, the speaker having a vibration axis, the diaphragm of the speaker vibrating along the vibration axis to generate sound; the protective cover comprising a main body and a suspension edge surrounding the main body, the main body having a sound-transmitting hole extending through it from the inside to the outside;

[0095] The main body has an inner surface opposite to the diaphragm, and the main body includes a phase cone extending outward from the inner surface; in a cross section of the protective cover along the vibration axis, the outline of the outer surface of the phase cone includes a curve that arches outward from the middle, and the width of the phase cone gradually decreases from the inside to the outside along the vibration axis.

[0096] The protective cover has a sound diffusion space defined by the outer surface of the phase cone and the suspension edge.

[0097] Clause 2. The vehicle-mounted sound generating device according to Clause 1, wherein, in the cross section, the phase cone has a vertex farthest from the diaphragm and a base point closest to the diaphragm, and the line connecting the vertex and the base point forms a semi-cone angle with the vibration axis, the semi-cone angle being 35 to 70 degrees.

[0098] Clause 3. The vehicle-mounted sound device according to Clause 2, wherein the phase cone includes a central phase cone located outside the center portion of the diaphragm, and the shape of the outer surface of the central phase cone comprises a sine wave.

[0099] Clause 4. The vehicle-mounted sound-generating device according to Clause 3, wherein the half-cone angle of the central phase cone is 41 to 70 degrees.

[0100] Clause 5. The vehicle-mounted sound-generating device according to Clause 3, wherein the phase cone further includes an annular phase cone disposed around the central phase cone, the annular phase cone and the central phase cone being spaced apart, and the sound-permeable hole includes a sound-permeable channel located between the central phase cone and the annular phase cone.

[0101] Clause 6. The vehicle-mounted sound-generating device according to Clause 5, wherein the half-cone angle of the annular phase cone is smaller than the half-cone angle of the central phase cone.

[0102] Clause 7. The vehicle-mounted sound-generating device according to Clause 6, wherein the semi-cone angle of the annular phase cone is 30 to 42 degrees.

[0103] Clause 8. The vehicle-mounted sound-generating device according to Clause 5, wherein the number of the annular phase cones is multiple, and in a top view, the multiple annular phase cones are concentric rings and spaced apart from the inside to the outside along the radial direction of the main body, and the sound-transmitting hole further includes a sound-transmitting channel located between adjacent annular phase cones.

[0104] Clause 9. The vehicle-mounted sound-generating device according to Clause 8, wherein the main body includes multiple rows of ribs spaced apart along the circumferential direction of the main body, the annular phase cone and the central phase cone are connected by the ribs, adjacent annular phase cones are connected by the ribs, and the ribs are located in the sound-permeable channel.

[0105] Clause 10. The vehicle-mounted sound-generating device according to Clause 9, wherein the thickness of the rib is less than the height of the phase cone.

[0106] Clause 11. The vehicle-mounted sound-generating device according to Clause 8, wherein the half-cone angle of any of the annular phase cones is smaller than the half-cone angle of the outer annular phase cone.

[0107] Clause 12. The vehicle-mounted sound device according to any one of Clauses 1 to 11, wherein the protective cover is located above the speaker and the apex of the phase cone is lower than the upper edge of the suspension.

[0108] Clause 13. The vehicle-mounted sound device according to any one of Clauses 1 to 11, wherein the inner surface of the protective cover has a conical surface that gradually slopes downward from the outside to the inside and a plane or an upwardly arched spherical surface that is surrounded by the conical surface and interacts with the middle part of the diaphragm; a limiting post is provided inside the housing, the limiting post being located inside the diaphragm and being able to contact the diaphragm after the diaphragm is compressed.

[0109] Clause 14. A vehicle-mounted pedestrian warning device, comprising a vehicle-mounted sound-emitting device as described in any one of Clauses 1 to 13.

[0110] Clause 15. A vehicle-mounted warning system comprising a pedestrian warning device and a horn for playing sound outside the vehicle compartment, wherein the pedestrian warning device and the horn share a vehicle-mounted sound-generating device as described in any one of Clauses 1 to 13.

[0111] Clause 16. A speaker protective cover for covering the outside of the speaker, the protective cover comprising a main body and a surrounding edge, the main body having a sound-transmitting hole extending through it from the inside to the outside; wherein,

[0112] The main body has an inner surface configured to face the diaphragm of the loudspeaker, and the main body includes a phase cone extending outward from the inner surface; in a cross section of the protective cover along the vibration axis of the loudspeaker, the outline of the outer surface of the phase cone includes a curve that arches outward from the middle, and the width of the phase cone gradually decreases from the inside to the outside along the vibration axis;

[0113] The phase cone is formed by a front cover and a rear cover, and the phase cone has a cavity located between the front cover and the rear cover.

[0114] Clause 17. The protective cover according to Clause 16, wherein one of the front cover and the rear cover is provided with a positioning post and the other is provided with a positioning hole, the positioning post being inserted into the positioning hole.

[0115] Clause 18. The protective cover according to Clause 16, wherein the front cover and the rear cover are injection-molded plastic parts, and the front cover and the rear cover are connected to each other after molding to enclose and form the cavity.

[0116] Clause 19. The protective cover according to any one of Clauses 16 to 18, wherein the phase cone includes a central phase cone and one or more annular phase cones, the annular phase cones surrounding the central phase cone, the central phase cone and the annular phase cones being spaced apart to form a sound-permeable channel; a single front cover and a single rear cover enclose the central phase cone and the annular phase cone.

[0117] Clause 20. The protective cover according to Clause 19, wherein the front cover has a crest and a trough corresponding to the phase cone, the rear cover has a cone-shaped wall in the shape of a truncated cone, the trough and the cone-shaped wall are connected, and the sound transmission channel is opened on the trough and the cone-shaped wall and passes through the trough and the cone-shaped wall in the front-back direction.

[0118] Clause 21. The protective cover according to Clause 20, wherein the rear cover further includes a limiting protrusion extending forward from the conical wall, the trough having a limiting notch, a portion of the limiting protrusion being inserted into the limiting notch, or the trough being restricted between at least two of the limiting protrusions.

[0119] Clause 22. The protective cover according to Clause 20, wherein the thickness difference between the crest, the trough and the conical wall is less than 25% of the thickness of the conical wall; the rear cover also has a spherical wall corresponding to the spherical top of the speaker diaphragm, the outer edge of the spherical wall being connected to the conical wall, the middle of the spherical wall being arched upward, and the thickness of the spherical wall being less than or equal to that of the conical wall.

[0120] Clause 23. The protective cover according to Clause 19, wherein the shape of the outline of the outer surface of each of the phase cones comprises a sine wave; each of the phase cones has a vertex farthest from the diaphragm of the loudspeaker and a bottom point closest to the diaphragm, the line connecting the vertex and the bottom point forming a half-cone angle with the vibration axis, the half-cone angle of the annular phase cone being smaller than the half-cone angle of the central phase cone; the half-cone angle of the central phase cone being 41 to 70 degrees, and the half-cone angle of the annular phase cone being 15 to 40 degrees.

[0121] Clause 24. The protective cover according to any one of Clauses 16 to 18, wherein the main body is formed by bonding the front cover and the rear cover together, the inner surface is located on the rear cover, and the outer surface is located on the front cover; the front cover is provided with a snap fastener for connecting the housing of the speaker.

[0122] Clause 25. A vehicle-mounted warning device comprising a pedestrian warning device and / or a horn for playing sound outside the vehicle compartment, wherein the pedestrian warning device and / or horn comprises a protective cover as described in any one of Clauses 1 to 9, the protective cover being disposed outside the speaker, the speaker being mounted in a housing.

[0123] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0124] Those skilled in the art will understand that, unless otherwise stated, the singular forms “a,” “the,” and “the” used herein may also include the plural forms. It will be further understood that “multiple” in this disclosure refers to two or more, and other quantifiers are similarly understood.

[0125] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0126] In this disclosure, unless otherwise expressly 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.

[0127] The above embodiments are only for illustrating the technical concept and features of this disclosure, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of this disclosure and implement it accordingly, and they cannot be used to limit the scope of protection of this disclosure.

Claims

1. A protective cover for a loudspeaker, used to cover the outside of the loudspeaker, the protective cover comprising a main body and a suspension edge surrounding the main body, the main body having a sound-transmitting hole extending through it from the inside to the outside; The main body has an inner surface configured to face the diaphragm of the loudspeaker, and the main body includes a phase cone extending outward from the inner surface; in a cross section of the protective cover along the vibration axis of the loudspeaker, the outline of the outer surface of the phase cone includes a curve that arches outward from the middle, and the width of the phase cone gradually decreases from the inside to the outside along the vibration axis; The protective cover has a sound diffusion space defined by the outer surface of the phase cone and the suspension edge.

2. The protective cover according to claim 1, characterized in that, The phase cone includes a central phase cone extending outward from the inner surface and one or more annular phase cones. The annular phase cones surround the central phase cone, and the central phase cone and the annular phase cones are spaced apart to form a sound-transmitting channel.

3. The protective cover according to claim 2, characterized in that, In a cross-section of the protective cover along the vibration axis of the loudspeaker, the outline of the outer surface of the central phase cone and the annular phase cone includes a curve that arches outward from the center, and the width of the phase cone gradually decreases from the inside to the outside along the vibration axis.

4. The protective cover according to claim 3, characterized in that, The shapes of the outer surfaces of the central phase cone and the annular phase cone include sinusoidal waveforms.

5. The protective cover according to any one of claims 2 to 4, characterized in that, The number of annular phase cones is multiple. From a top view, the multiple annular phase cones are concentric rings and are spaced apart from the inside to the outside along the radial direction of the main body. Another sound transmission channel is formed between adjacent annular phase cones.

6. The protective cover according to claim 5, characterized in that, In the cross section, each of the phase cones has a vertex farthest from the diaphragm of the loudspeaker and a base point closest to the diaphragm, and the line connecting the vertex and the base point forms a semi-cone angle with the vibration axis. The semi-cone angle of the annular phase cone is smaller than that of the central phase cone.

7. The protective cover according to claim 6, characterized in that, The semi-cone angle of the central phase cone is 41 to 70 degrees, and the semi-cone angle of the annular phase cone is 15 to 40 degrees.

8. The protective cover according to claim 7, characterized in that, The main body includes multiple rows of ribs spaced apart along the circumference of the main body. The annular phase cone and the central phase cone are connected by the ribs, and adjacent annular phase cones are connected by the ribs. The ribs are located in the sound transmission channel.

9. The protective cover according to any of the preceding claims, characterized in that, The phase cone is formed by a front cover and a rear cover, and the phase cone has a cavity located between the front cover and the rear cover.

10. The protective cover according to claim 9, characterized in that, One of the front cover and the rear cover is provided with a positioning post, and the other is provided with a positioning hole, with the positioning post inserted into the positioning hole.

11. The protective cover according to claim 9 or 10, characterized in that, The front cover and the rear cover are injection-molded plastic parts, and after molding, the front cover and the rear cover are connected to each other to enclose and form the cavity.

12. The protective cover according to any one of claims 9 to 11, characterized in that, The phase cone includes a central phase cone and one or more annular phase cones, the annular phase cones surrounding the central phase cone, and the central phase cone and the annular phase cones are spaced apart to form a sound transmission channel; a single front cover and a single rear cover enclose the central phase cone and the annular phase cone.

13. The protective cover according to claim 12, characterized in that, The front cover has a crest and a trough corresponding to the phase cone, and the rear cover has a cone-shaped wall in the shape of a truncated cone. The trough and the cone-shaped wall are connected. The sound transmission channel is opened on the trough and the cone-shaped wall and passes through the trough and the cone-shaped wall in the front-back direction.

14. The protective cover according to claim 13, characterized in that, The rear cover also includes a limiting protrusion extending forward from the conical wall, and a limiting notch is provided on the trough. Part of the limiting protrusion is inserted into the limiting notch, or the trough is restricted between at least two of the limiting protrusions.

15. The protective cover according to claim 13 or 14, characterized in that, The thickness difference between the crest, the trough and the conical wall is less than 25% of the thickness of the conical wall; the rear cover also has a spherical wall corresponding to the spherical top of the speaker diaphragm, the outer edge of the spherical wall is connected to the conical wall, the middle part of the spherical wall is arched upward, and the thickness of the spherical wall is less than or equal to that of the conical wall.

16. The protective cover according to any one of claims 9 to 15, characterized in that, The main body is composed of the front cover and the rear cover bonded together, with the inner surface located on the rear cover and the outer surface located on the front cover; the front cover is provided with a buckle for connecting the speaker housing.

17. A vehicle-mounted sound device, comprising a housing, a speaker mounted in the housing, and a protective cover as described in any of the preceding claims.

18. The vehicle-mounted sound-generating device according to claim 17, characterized in that, The number of annular phase cones is multiple. From a top view, the multiple annular phase cones are concentric rings and are spaced apart from the inside to the outside along the radial direction of the main body. The sound transmission hole also includes a sound transmission channel located between adjacent annular phase cones. The half-cone angle of any annular phase cone is smaller than the half-cone angle of the annular phase cone outside it.

19. The vehicle-mounted sound-generating device according to claim 17 or 18, characterized in that, The protective cover is located above the speaker, and the apex of the phase cone is lower than the upper edge of the suspension edge.

20. The vehicle-mounted sound-generating device according to any one of claims 17 to 19, characterized in that, The inner surface of the protective cover has a conical surface that gradually slopes downward from the outside to the inside and a plane or an upwardly arched spherical surface that is surrounded by the conical surface and interacts with the middle of the diaphragm; a limiting post is provided inside the housing, the limiting post is located inside the diaphragm and can contact the diaphragm after the diaphragm is compressed.

21. A vehicle-mounted pedestrian warning device, comprising a vehicle-mounted sound-emitting device, the vehicle-mounted sound-emitting device comprising a protective cover as described in any one of claims 1 to 16, or the vehicle-mounted sound-emitting device being a vehicle-mounted sound-emitting device as described in any one of claims 17 to 20.

22. A vehicle-mounted warning system, comprising a vehicle-mounted sound-emitting device, the vehicle-mounted sound-emitting device comprising a protective cover as described in any one of claims 1 to 16, or the vehicle-mounted sound-emitting device being a vehicle-mounted sound-emitting device as described in any one of claims 17 to 20; the vehicle-mounted sound-emitting device having a first operating mode and a second operating mode, wherein in the first operating mode, the vehicle-mounted sound-emitting device is configured to emit a pedestrian warning sound simulating the sound of a car engine to pedestrians; and in the second operating mode, the vehicle-mounted sound-emitting device is configured to emit a horn sound in response to a horn command or horn signal.

Images