Loudspeaker protection cover and vehicle-mounted warning device

Abstract

The utility model discloses a loudspeaker protection cover and a vehicle-mounted warning device. The protective cover of the loudspeaker is used for covering the outer side of the loudspeaker, the protective cover comprises a main body part and a dangling edge surrounding the main body part, and the main body part is provided with a sound transmission hole penetrating through the main body part from inside to outside; the main body part is provided with an inner side surface which is configured to be opposite to a vibrating diaphragm of the loudspeaker, and the main body part comprises a phase cone which extends outwards from the inner side surface; in the cross section of the protective cover along the vibration axis of the loudspeaker, the outline of the outer side surface of the phase cone comprises a curve of which the middle part is arched outwards, and the width of the phase cone is gradually reduced from inside to outside along the vibration axis; the phase cone is defined by a front cover body and a rear cover body, and the phase cone is provided with a cavity located between the front cover body and the rear cover body. On the premise that the intermediate frequency sensitivity of the loudspeaker is improved, injection molding is facilitated, and the injection molding yield is improved.

Description

Technical Field

[0001] The utility model relates to a loudspeaker protective cover and a vehicle-mounted warning device. Background Art

[0002] Regarding the on-board pedestrian warning device, the applicant proposed an on-board sound-generating device in patent CN118124482A, which uses a protective cover with a phase cone. Its peak-shaped raised structure (phase cone) changes the direction of the airflow, reduces the path difference between the diaphragm and the sound outlet, and can correct the phase and reflection angle of the sound wave, so that the medium and high frequency sound waves can be carried out in a wider space, effectively improving the sensitivity. If the injection molding process is used to manufacture this protective cover, the following problems will exist in actual production: the thickness of the protective cover varies greatly. During the demolding and cooling process, the plastic parts will shrink, and the shrinkage difference of different parts of the protective cover is large. In particular, the peak part of the phase cone is thicker, and the shrinkage is significantly greater than that of other parts with smaller thickness. This will cause the final molded protective cover to be significantly different from the designed shape, not meeting the design requirements, with a low yield and greater difficulty in injection molding. Utility Model Content

[0003] The utility model provides an improved loudspeaker protective cover and a vehicle-mounted warning device having the same, which facilitates injection molding and improves the injection molding yield while improving the intermediate frequency sensitivity of the loudspeaker.

[0004] A first aspect of the present invention provides a protective cover for a speaker, which is used to cover the outside of the speaker. The protective cover includes a main body and a hanging edge surrounding the main body. The main body is provided with a sound-transmitting hole that passes through the main body from the inside to the outside.

[0005] The main body has an inner surface configured to face the diaphragm of the speaker, 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 speaker, the outer surface of the phase cone has a profile including a curve with a central portion arched outward, and the width of the phase cone gradually decreases from the inside to the outside along the vibration axis;

[0006] The phase cone is formed by enclosing a front cover and a rear cover, and the phase cone has a cavity located between the front cover and the rear cover.

[0007] In a preferred 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, and the positioning post is inserted into the positioning hole.

[0008] In a preferred embodiment, the front cover body and the rear cover body are respectively injection-molded plastic parts, and the front cover body and the rear cover body are connected to each other after molding to enclose and form the cavity.

[0009] In a preferred embodiment, the phase cones include a central phase cone and one or more ring phase cones surrounding the central phase cone, the central phase cone and the ring phase cones being spaced apart to form a sound transmission channel; the single front cover and the single back cover enclosing the central phase cone and the ring phase cones.

[0010] In a more preferred embodiment, the front cover has a wave crest corresponding to the phase cones and a wave trough, the back cover has a conical wall in the shape of a truncated cone, the wave trough and the conical wall are connected, and the sound transmission channel is formed on the wave trough and the conical wall and extends through the wave trough and the conical wall in the front-rear direction.

[0011] In a further preferred embodiment, the back cover further includes a limiting protrusion extending forward from the conical wall, and the wave trough is provided with a limiting gap, and the limiting protrusion is inserted into the limiting gap.

[0012] Alternatively or further, the back cover further includes a plurality of limiting protrusions extending forward from the conical wall, and the wave trough is limited between at least two of the limiting protrusions.

[0013] In a further preferred embodiment, the thickness difference between the wave crest, the wave trough and the conical wall is less than 25% of the thickness of the conical wall.

[0014] In a further preferred embodiment, the back cover further has a spherical shell wall corresponding to the spherical top of the diaphragm of the loudspeaker, the outer edge of the spherical shell wall is connected to the conical wall, the middle part of the spherical shell wall is arched upward, and the thickness of the spherical shell wall is less than or equal to the thickness of the conical wall. The central phase cone is enclosed by the spherical shell wall and the middle part of the front cover.

[0015] In a more preferred embodiment, the shape of the profile of the outer side surface of each phase cone includes a sine wave shape.

[0016] In a more preferred embodiment, each phase cone has an apex farthest from the diaphragm of the loudspeaker and a bottom point closest to the diaphragm, a line connecting the apex and the bottom point forms a half-cone angle with the vibration axis, and the half-cone angle of the ring phase cone is smaller than the half-cone angle of the central phase cone. The half-cone angle is 10-70 degrees.

[0017] Further, the half-cone angle of the central phase cone is 41-70 degrees, and the half-cone angle of the ring phase cone is 15-40 degrees.

[0018] Further, the number of the annular phase cones is multiple, and the multiple annular phase cones are concentric rings and are arranged in a radial direction of the main body from inside to outside, and the sound hole further comprises a sound transmission channel between adjacent annular phase cones.

[0019] In a preferred embodiment, the protective cover is located above the loudspeaker, and the vertex of the phase cone is lower than the upper edge of the overhang.

[0020] In a preferred embodiment, the main body is composed of the front cover and the rear cover which are bonded to each other, the inner side surface is located on the rear cover, and the outer side surface is located on the front cover; a buckle for connecting the shell of the loudspeaker is arranged on the front cover, and the buckle is specifically located on the overhang.

[0021] In a preferred embodiment, the protective cover has a sound diffusion space which is defined by the outer side surface of the phase cone and the overhang.

[0022] The second aspect of the present application provides a vehicle-mounted warning device, which comprises a pedestrian warning device and / or a horn loudspeaker for playing sound outside the vehicle cabin, and the pedestrian warning device and / or the horn loudspeaker comprise the protective cover described above, the protective cover is arranged outside the loudspeaker, and the loudspeaker is installed in the shell.

[0023] Further, the vehicle-mounted warning device comprises the pedestrian warning device and the horn loudspeaker, and the pedestrian warning device and the horn loudspeaker share a vehicle-mounted sound generating device, and the vehicle-mounted sound generating device comprises the protective cover, the shell and the loudspeaker.

[0024] In a preferred embodiment, the shell is provided with a limiting column which is located on the inner side of the diaphragm and can be in contact with the diaphragm after the diaphragm is pressed.

[0025] Compared with the prior art, the protective cover for the loudspeaker has the following advantages:

[0026] The protective cover for the loudspeaker of the present application adopts the phase cone structure, improves the mid-frequency sensitivity of the loudspeaker, and forms a hollow structure enclosed by two thin-walled cover bodies, thereby avoiding the problem of large difference in demolding cooling shrinkage caused by large difference in thickness, and finally forming a protective cover that meets the design shape and design requirements, thereby facilitating injection molding and improving the injection molding yield. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme of the present application, the drawings used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0028] Figure 1 A structural diagram of a vehicle-mounted sound production device according to an embodiment of the present application.

[0029] Figure 2 An exploded view of a vehicle-mounted sound production device according to an embodiment of the present application.

[0030] Figure 3 A side view of a loudspeaker protective cover according to an embodiment of the present application.

[0031] Figure 4 An exploded view of the protective cover shown in Figure 3

[0032] A sectional view of the protective cover shown in Figure 5 Figure 3

[0033] Figure 6 A local enlarged view of position A in Figure 5

[0034] In the above drawings,

[0035] 100, vehicle-mounted warning device;

[0036] 1, housing; 11, upper shell; 12, lower shell; 13, limiting column; 14, through hole; 15, stepped hole; 101, sound cavity; 102, mounting groove;

[0037] 2, loudspeaker; 21, diaphragm; 211, cone; 212, ball top; 22, voice coil; 23, magnetic circuit assembly; 231, front piece; 2311, hole; 24, positioning support piece;

[0038] 3, protective cover; 301, front cover body; 3011, wave crest part; 3012, wave trough part; 302, rear cover body; 3021, conical wall; 3022, spherical shell wall; 303, cavity; 304, positioning column; 305, positioning hole; 306, limiting protrusion; 307, limiting notch; 308, buckle;

[0039] 31, suspension edge; 32, main body part; 33, phase cone; 331, central phase cone; 332, annular phase cone; 34, sound transmission channel; 36, sound diffusion space. DETAILED DESCRIPTION

[0040] ​​​The preferred embodiments of the utility model are described in detail below with reference to the drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation on the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0041] In this paper, "inside", "outside" is defined with reference to the loudspeaker, the direction close to the loudspeaker is inside, and vice versa. The orientation words "up", "down", "horizontal" are intended to facilitate the understanding of the structure of the vehicle warning device by those skilled in the art, and are not used to limit the state of the vehicle warning device after installation in the use scene. For example, the vehicle warning device can be installed on the horizontal surface, inclined surface or vertical surface of the vehicle.

[0042] The embodiment provides a protective cover of a loudspeaker, in particular a vehicle warning device with the protective cover. The vehicle warning device is used to emit warning sound outside the vehicle. Specifically, the vehicle warning device is installed on the vehicle and can be arranged on the outside of the vehicle cabin for radiating sound outside the vehicle. The vehicle is typically a new energy vehicle driven by a battery, including electric vehicles and the like.

[0043] Referring to Figures 1 to 6 As shown in the figure, the vehicle warning device 100 mainly comprises a shell 1, a loudspeaker 2 and a protective cover 3. The shell 1, the loudspeaker 2 is installed in the shell 1, and the protective cover 3 is fixed on the shell 1 and covers the outside of the loudspeaker 2, so as to provide protection for the loudspeaker 2. Taking the orientation shown in the drawing as an example, the shell 1 comprises an upper shell 11 and a lower shell 12 connected with each other, an acoustic cavity 101 is formed between the upper shell 11 and the lower shell 12, and a generally conical mounting groove 102 is formed in the middle of the upper shell 11. The loudspeaker 2 is arranged in the mounting groove 102, and the loudspeaker 2 does not need to additionally configure a support structure such as a basket or a support, and the diaphragm 21, the magnetic circuit assembly 23 and the positioning support 24 of the loudspeaker 2 are directly fixed on the upper shell 11 and supported by the upper shell 11. The protective cover 3 is fixed on the upper shell 11, and the loudspeaker 2 is clamped between the protective cover 3 and the upper shell 11.

[0044] Specifically, as Figure 2As shown, the upper shell 11 has a plurality of upwardly extending limit posts 13. In the initial or normal working state of the vehicle warning device 100, the diaphragm 21 is located at a distance above the limit posts 13, and the two are not in contact with each other. When the pressure on the diaphragm 21 is greater than the set threshold, the diaphragm 21 deforms downwardly and contacts the limit posts 13, preventing the diaphragm 21 from being damaged by excessive deformation after being pressed, and preventing the voice coil 22 connected to the diaphragm 21 from being damaged. In actual use, especially in heavy rain, rainwater enters the diaphragm 21, increasing the pressure on the diaphragm 21. The limit posts 13 can prevent the diaphragm 21 from being damaged by excessive deformation of the loudspeaker 2.

[0045] Further, as shown in Figure 2 , the outer edge of the diaphragm 21 is fixed to the edge of the upper shell 11 and is clamped between the edge of the upper shell 11 and the edge of the protective cover 3. A plurality of through holes 14 are formed in the upper shell 11 to communicate the space inside and outside the shell 1, specifically to communicate the acoustic cavity 101 and the mounting groove 102. A stepped hole 15 is formed in the middle of the upper shell 11, and the magnetic circuit assembly 23 is installed in the stepped hole. The stepped hole 15 has a plurality of horizontal step surfaces. The outer edge of the positioning support 24 is fixed to one of the step surfaces.

[0046] The loudspeaker 2 has a vibration axis Z0(as shown in Figure 5 ), and the diaphragm 21 of the loudspeaker 2 vibrates along the vibration axis Z0 to produce sound. The vibration axis Z0 and the center line of the voice coil 22 coincide with each other. The magnetic circuit assembly 23, the voice coil 22, and the diaphragm 21 are arranged in order from the inside to the outside along the vibration axis Z0, and the positioning support 24 is sleeved on the voice coil 22. A through hole is formed in the middle of the front piece of the magnetic circuit assembly 23 to facilitate overflow during bonding of the magnetic circuit assembly 23. In this embodiment, the diaphragm 21 has a cone 211 and a ball top 212 located in the middle of the cone 211, and the ball top 212 is the central part of the diaphragm 21, and the cone 211 is arranged around the ball top 212. The diaphragm 21, its cone 211 and ball top 212 are all revolved bodies with the above-mentioned vibration axis Z0 as the center of revolution. In other embodiments, the central part of the diaphragm 21 can be a central through hole or a flat plate.

[0047] The protective cover 3 is a plastic part, typically manufactured using an injection molding process. In this embodiment, the protective cover 3 is assembled from multiple parts, using a split structure, with each part injection molded separately and then assembled together, including but not limited to bonding, snap connection, fastener connection, and other connection methods. The specific structure of the protective cover 3 will be described in detail below.

[0048] The protective cover 3 includes a main body 32 and a suspension 31 surrounding the main body 32. The main body 32 is provided with a sound-transmitting hole that passes through the main body 32 from the inside to the outside. The suspension 31 is fixed to the edge of the upper shell 11 and the outer edge of the diaphragm 21. The main body 32 is arranged corresponding to the sound-emitting part of the diaphragm 21, providing protection for it and assisting in sound diffusion. The main body 32 has an inner surface opposite to the diaphragm 21. The shape of the inner surface is consistent with the upper surface of the diaphragm 21, and the distance between the two along the vibration axis Z0 is basically equal everywhere. The inner surface of the protective cover 3 has a conical surface, which gradually tilts downward from the outside to the inside, and the middle part enclosed by the conical surface corresponds to the center part of the diaphragm 21.

[0049] The main body 32 includes one or more phase cones 33 extending outward from its inner surface. In a cross-section of the protective cover 3 along the vibration axis Z0, the outer surface of each phase cone 33 has a curved profile with a central portion that arches outward, and the width of each phase cone 33 gradually decreases from the inner side to the outer side along the vibration axis Z0. The protective cover 3 defines a sound diffusion space 36 defined by the outer surface of each phase cone 33 and the flange 31.

[0050] The phase cone 33 includes a central phase cone 331, which is arranged on the outside of the center of the diaphragm 21. In the above cross section, the central phase cone 331 is an axisymmetric figure with the above vibration axis Z0 as the symmetry axis. Preferably, the shape of the contour of the outer surface 330 of the central phase cone 331 includes a sine waveform. The phase cone 33 also includes an annular phase cone 332, which is annular. It should also be noted that in the above cross section, each annular phase cone 332 is composed of its own outer surface ( Figure 5 The upper surface of the Figure 5 The phase cone 33 is formed by enclosing the contour (diagonal lines) of the lower surface in the figure. In the above cross section, the phase cone 33 has a vertex P1 farthest from the diaphragm 21 and a base P2 closest to the diaphragm 21. The line connecting the vertex P1 and the base P2 forms a semi-cone angle α with the vibration axis Z0. The semi-cone angle α ranges from 10 to 70 degrees.

[0051] In this embodiment, the phase cone 33 includes a central phase cone 331 and a plurality of annular phase cones 332. The semi-cone angle of the central phase cone 331 is 35 to 70 degrees, preferably 41 to 70 degrees. The semi-cone angle of the annular phase cone 332 is smaller than the semi-cone angle of the central phase cone 331. The semi-cone angle of the annular phase cone 332 is 15 to 40 degrees. There are multiple annular phase cones 332. When viewed from above, the multiple annular phase cones 332 are concentric rings and are spaced from the inside to the outside along the radial direction of the main body 32. The semi-cone angle of any annular phase cone 332 is smaller than or larger than the semi-cone angle of the annular phase cone 332 on its outside. Specifically in the attached Figures 3 to 6In the shown embodiment, two annular phase cones 332 are arranged at intervals around the middle central phase cone 331. The half-cone angle of the central phase cone 331 is 44.8 degrees, the half-cone angle of the inner annular phase cone 332 is 26.1 degrees, and the half-cone angle of the outer annular phase cone 332 is 33.5 degrees.

[0052] The central phase cone 331 and the annular phase cones 332 are arranged at intervals, and have intervals between each other. The sound transmission holes include the sound transmission channels 34 between the central phase cone 331 and the annular phase cones 332, and the sound transmission channels between adjacent annular phase cones 332. As shown in the figure, Figure 3 As shown, the sound transmission channels 34 are annular slit-shaped channels. In addition to the sound transmission channels 34, the conical surface of the inner side surface 321 of the protective cover 3 is a continuous surface.

[0053] The main body part 32 includes a plurality of ribs arranged at intervals along the circumferential direction of the main body part 32. The annular phase cones 332 and the central phase cone 331 are connected by the ribs, and adjacent annular phase cones 332 are connected by the ribs. The ribs are located in the sound transmission channels 34. The thickness of the ribs is less than the height of the phase cone 33. Further, the thickness of the ribs is preferably less than 1 / 4 of the height of the central phase cone.

[0054] The phase cone 33 is enclosed by the front cover body 301 and the rear cover body 302, and has a cavity 303 between the front cover body 301 and the rear cover body 302. The front cover body 301 is located in front of the rear cover body 302, that is, after being assembled into the vehicle-mounted warning device, the rear cover body 302 is located between the front cover body 301 and the diaphragm 21 of the loudspeaker 2. The front cover body 301 and the rear cover body 302 are both thin-walled structures, and the overall thickness of the two is relatively uniform. The front cover body 301 and the rear cover body 302 are separately injection molded and then joined together, thereby solving the problem of different shrinkage amounts in different parts caused by demolding cooling during injection molding. Further, the protective cover 3 is composed of the front cover body 301 and the rear cover body 302. The front cover body 301 and the rear cover body 302 enclose each phase cone 33, that is, the central phase cone 331 and the annular phase cones 332. Each phase cone 33 has a cavity 303 enclosed by the single front cover body 301 and the single rear cover body 302.

[0055] One of the front cover body 301 and the rear cover body 302 is provided with a positioning column 304, and the other is provided with a positioning hole 305. The positioning column 304 is inserted into the positioning hole 305. In the present embodiment, a plurality of positioning columns 304 extending forward are arranged at intervals on the rear cover body 302, and corresponding positioning holes 305 are formed on the front cover body 301. The positioning columns 304 are inserted into the positioning holes 305 to ensure accurate positioning of the front cover body 301 and the rear cover body 302 when they are joined.

[0056] The front cover 301 has a peak portion 3011 and a trough portion 3012 corresponding to the phase cone 33. The rear cover 302 has a conical wall 3021 in the shape of a truncated cone. The trough 3012 and the conical wall 3021 are in contact (and can be further bonded together using glue). The sound-transmitting channel 34 is formed in the trough 3012 and the conical wall 3021 and passes through the trough 3012 and the conical wall 3021 in the front-to-back direction. The rear cover 302 also includes a stopper protrusion 306 extending forward from the conical wall 3021. The trough 3012 is provided with a stopper notch 307. A portion of the stopper protrusion 306 is inserted into the stopper notch 307 and can be bonded together using glue. Furthermore, there are multiple limiting protrusions 306, and the trough 3012 is confined between at least two limiting protrusions 306 to ensure precise alignment of the front cover 301 and the rear cover 302 when assembled. Specifically, in this embodiment, the limiting protrusions 306 are annular when viewed along the vibration axis, and multiple circles of limiting protrusions 306 are arranged around the vibration axis in a concentric ring shape.

[0057] The difference in thickness between the peaks 3011 and troughs 3012 and the conical wall 3021 is less than 25% of the thickness of the conical wall 3021. Ideally, this thickness difference is zero. The rear housing 302 also includes a spherical shell-shaped wall 3022, corresponding to the dome of the speaker's diaphragm. The outer edge of the spherical shell-shaped wall 3022 is connected to the conical wall 3021, and the middle portion of the spherical shell-shaped wall 3022 is arched upward. The thickness of the spherical shell-shaped wall 3022 is less than or equal to that of the conical wall 3021. The central phase cone 33 is formed by the spherical shell-shaped wall 3022 and the middle portion of the front housing 301. The aforementioned conical surface is the rear surface of the conical wall 3021, the aforementioned inner surface is the entire rear surface of the rear housing 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 portion of the front housing 301. The outer edge of the front cover 301 is the aforementioned hanging edge 31 , and a plurality of buckles 308 for connecting with the housing 1 are provided on the outer edge of the front cover 301 .

[0058] The protective cover 3 is located above the speaker 2 and is combined with Figure 5 As shown, the apex of the phase cone 33 is lower than the upper edge of the suspension 31. 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 31.

[0059] The vehicle-mounted warning device 100 described above can simultaneously serve as a pedestrian warning device and a horn of a vehicle-mounted warning system. The vehicle-mounted pedestrian warning device can simulate a sound similar to a sound of a traditional vehicle engine according to current vehicle speed, gear position and other information, and project the sound to pedestrians outside the vehicle, thereby reminding the pedestrians of the current state of the vehicle. Meanwhile, the vehicle-mounted warning device can also play a sound of a horn. Upon receiving a horn instruction from a driver or a control system, the vehicle-mounted warning device emits a sharp horn sound to remind pedestrians to pay attention.

[0060] The vehicle-mounted warning device 100 of the embodiment: by using a throat-plug type mesh cover structure, a throat-plug structure in the middle, and a phase cone 33 structure with a sharp peak embedded in the middle structure of the entire mesh cover, the direction of airflow is changed, and the entire sound field is also changed. The functions of the phase cone 33: 1. correcting phase and reflection angle, capable of shortening time, and also capable of widening the diffusion angle of mid-high frequency signals, so that mid-high frequency sound waves can be in a wider space. 2. reducing airflow interference and effectively improving sensitivity. At the same time, the phase cone structure is a hollow structure formed by two thin-walled cover bodies, which avoids the problem of large difference in shrinkage amount caused by large difference in thickness due to demolding cooling, and the finally formed protective cover conforms to the designed shape and meets the design requirements, thereby facilitating injection molding and improving injection molding yield.

[0061] As shown in the specification and claims, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements.

[0062] It can be further understood that "multiple" in the present disclosure means two or more, and other quantifiers are similar.

[0063] It can be further understood that the terms "first", "second", and the like are used to describe various information, but these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not represent a specific order or importance. In fact, the expressions of "first", "second", and the like can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0064] The above embodiments are only for illustrating the technical concept and characteristics of the present utility model, and are a preferred embodiment, the purpose of which is to enable those skilled in the art to understand the content of the present utility model and implement it, and it cannot limit the protection scope of the present utility model.

Claims

1. A speaker protective cover, used to cover the outside of the speaker, the protective cover comprising a main body and a hanging edge surrounding the main body, the main body being provided with a sound-transmitting hole passing through the main body from the inside to the outside; characterized in that: The main body has an inner surface configured to face the diaphragm of the speaker, 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 speaker, the outer surface of the phase cone has a profile including a curve with a central portion arched outward, and the width of the phase cone gradually decreases from the inside to the outside along the vibration axis; The phase cone is formed by enclosing a front cover and a rear cover, and the phase cone has a cavity located between the front cover and the rear cover.

2. The speaker protection cover according to claim 1, 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, and the positioning post is inserted into the positioning hole.

3. The speaker protection cover according to claim 1, wherein: The front cover body and the rear cover body are respectively injection-molded plastic parts. After being molded, the front cover body and the rear cover body are connected to each other to enclose and form the cavity.

4. The loudspeaker protective cover according to any one of claims 1 to 3, characterized in that: The phase cone includes a central phase cone 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 arranged at intervals to form a sound-transmitting channel; a single front cover and a single rear cover enclose the central phase cone and the annular phase cone.

5. The speaker protection cover according to claim 4, characterized in that: The front cover has a peak portion and a trough portion corresponding to the phase cone, and the rear cover has a conical wall in the shape of a truncated cone. The trough portion and the conical wall are connected, and the sound-transmitting channel is opened on the trough portion and the conical wall and passes through the trough portion and the conical wall in the front-to-back direction.

6. The speaker protection cover according to claim 5, 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 portion, and part of the limiting protrusion is inserted into the limiting notch, or the trough portion is confined between at least two of the limiting protrusions.

7. The speaker protection cover according to claim 5, characterized in that The difference in thickness between the crest portion, the trough portion and the conical wall is less than 25% of the thickness of the conical wall; the rear cover also has a spherical shell wall corresponding to the spherical top of the diaphragm of the speaker, the outer edge of the spherical shell wall is connected to the conical wall, the middle part of the spherical shell wall is arched upward, and the thickness of the spherical shell wall is less than or equal to the conical wall.

8. The speaker protection cover according to claim 4, wherein: The shape of the contour of the outer surface of each phase cone includes a sine waveform; each phase cone has a vertex farthest from the diaphragm of the speaker and a bottom point closest to the diaphragm, and a semi-cone angle is formed between the line connecting the vertex and the bottom point and the vibration axis, and the semi-cone angle of the annular phase cone is smaller than the semi-cone angle of the central phase cone; the semi-cone angle of the central phase cone is 41~70 degrees, and the semi-cone angle of the annular phase cone is 15~40 degrees.

9. The loudspeaker protective cover according to any one of claims 1 to 3, characterized in that: The main body is composed of the front cover and the rear cover bonded to each other, the inner surface is located on the rear cover, and the outer surface is located on the front cover; a buckle for connecting to the shell of the speaker is provided on the front cover.

10. A vehicle-mounted warning device, comprising a pedestrian warning device and / or a horn for playing sound outside the vehicle compartment, characterized in that: The pedestrian warning device and / or horn includes a speaker protective cover according to any one of claims 1 to 9, wherein the protective cover is arranged on the outside of the speaker, and the speaker is installed in a housing.

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