Protective cover, electroacoustic conversion assembly, vehicle door device and vehicle

Abstract

The invention provides a protective cover, an electro-acoustic conversion assembly, a vehicle door device and a vehicle, and is applied to the technical field of protection of electro-acoustic converters. The invention aims to solve the problem of how to improve the strength of a sound signal laterally input or output by the electro-acoustic transducer. The protective cover comprises a plurality of grids which are sequentially arranged in the first direction, a sound channel is formed between every two adjacent grids, and a plurality of sound channels are formed among the grids. Along the first direction, the sound wave phase delays of the plurality of sound channels are gradually increased, and the sound wave phase delay intervals between every two adjacent sound channels are equal, so that the transmission direction of the sound waves penetrating through the protection cover deflects relative to the transmission direction of the sound waves entering the protection cover. The protective cover is used for protecting the electro-acoustic transducer.

Description

Technical Field

[0001] The present application relates to the technical field of protection of electroacoustic converters, and in particular to a protective cover, an electroacoustic conversion component, a vehicle door device, and a vehicle. Background Art

[0002] At present, vehicles and other devices include electroacoustic transducers such as speakers, receivers, and microphones to achieve sound pickup or playback. Some electroacoustic transducers have strong sound signals when input or output in the forward direction, and weak sound signals when input or output in the lateral direction. In particular, the sound signals are particularly weak in the lateral direction that deviates from the forward direction by a large angle, resulting in poor performance of the electroacoustic transducer in some scenarios where it is misaligned with the sound receiving or transmitting end. Summary of the Invention

[0003] The purpose of the present application is to provide a protective cover, an electroacoustic conversion assembly, a door device and a vehicle, aiming to solve the problem of how to increase the intensity of the lateral input or output sound signal of the electroacoustic converter.

[0004] In a first aspect, a protective cover is provided for protecting an electroacoustic transducer. The protective cover includes a plurality of grilles arranged sequentially along a first direction, wherein a sound channel is formed between two adjacent grilles, and multiple sound channels are formed between the plurality of grilles. Along the first direction, the phase delay of sound waves in the multiple sound channels gradually increases, and the interval between the phase delays of sound waves in each adjacent sound channel is equal, so that the propagation direction of sound waves passing through the protective cover is deflected relative to the propagation direction of sound waves entering the protective cover.

[0005] Since in the protective cover provided by the present application, the sound wave phase delay of multiple sound channels gradually increases along the X direction, and the sound wave phase delay interval between each two adjacent sound channels is equal, the protective cover not only has a physical protective effect on the electroacoustic converter, but also affects the transmission direction of the sound, causing the sound to turn, and increasing the intensity of the lateral output or received sound signal, so as to achieve the use effect in the scenario where the electroacoustic converter and the sound receiving end or transmitting end are misaligned.

[0006] Optionally, a partition is provided in at least part of the sound channels, and the partition is used to increase the difference between the paths of two adjacent sound channels, so as to increase the sound wave phase delay interval between each two adjacent sound channels.

[0007] Optionally, the two grilles forming the sound channel are a first grille and a second grille, respectively. The partitions include at least one first partition and at least one second partition. The first partition extends from the first grille toward the second grille and is spaced apart from the second grille. The second partition extends from the second grille toward the first grille and is spaced apart from the first grille. Along the extension direction of the sound channel, the at least one first partition and the at least one second partition are sequentially staggered and spaced apart.

[0008] Optionally, along the extension direction of the sound channel, a second partition is provided between two adjacent first partitions, and a first partition is provided between two adjacent second partitions.

[0009] Optionally, along the first direction, the lengths of the partitions within the multiple sound channels gradually increase.

[0010] Optionally, the grille is in the shape of a flat plate.

[0011] Optionally, the distance between each two adjacent grids along the first direction is equal.

[0012] Optionally, the protective cover includes a first surface and a second surface facing each other. Along the extension direction of the sound channel, the end of the grille located on the first surface is a first end, and the end of the grille located on the second surface is a second end. The first ends of the plurality of grilles occupy a first length in the first direction, and the second ends of the plurality of grilles occupy a second length in the first direction, wherein the first length is greater than the second length.

[0013] Optionally, the first length is greater than or equal to 1.8 times the second length and less than or equal to 2.2 times the second length.

[0014] Optionally, the spacing between the first ends of each adjacent two grids in the first direction is equal and is the first spacing, the spacing between the second ends of each adjacent two grids in the first direction is equal and is the second spacing, and the first spacing is greater than or equal to 1.8 times the second spacing and less than or equal to 2.2 times the second spacing.

[0015] Optionally, the area occupied by the first ends of the multiple grids on the first surface is the first area, the area occupied by the second ends of the multiple grids on the second surface is the second area, and the first area is divided into a first half area and a second half area arranged along the first direction; the orthographic projection of the second area on the first area overlaps with the first half area, and the second half area is located outside the orthographic projection of the second area on the first area.

[0016] Optionally, at least a portion of the grid extends from the first end to the second end in a curve or a broken line.

[0017] Optionally, at least part of the grille includes a first flat portion, a second flat portion and a third flat portion arranged in sequence from the first end to the second end, the first flat portion and the third flat portion are parallel to the thickness direction of the protective cover, the second flat portion is perpendicular to the thickness direction of the protective cover, and the second flat portion is connected between the first flat portion and the third flat portion.

[0018] Optionally, it further includes a first side plate and a second side plate relative to each other, wherein the first side plate and the second side plate are respectively located on opposite sides of the plurality of grilles, and opposite ends of the plurality of grilles are respectively connected to the first side plate and the second side plate.

[0019] Optionally, a deflection angle of the sound wave emission direction of the protective cover relative to the sound wave incident direction of the protective cover is greater than or equal to 60°.

[0020] In a second aspect, an electroacoustic conversion assembly is also provided, which includes an electroacoustic converter and a protective cover as described in any of the above technical solutions, wherein the protective cover is arranged on the sound side of the electroacoustic converter.

[0021] In a third aspect, a vehicle door device is also provided, which includes a door body and an electroacoustic conversion component as described in the above technical solution, wherein the electroacoustic conversion component is arranged on the door body.

[0022] In a fourth aspect, a vehicle is also provided, which includes the protective cover as described in any of the above technical solutions, the electroacoustic conversion component as described in the above technical solutions, or the door device as described in the above technical solutions.

[0023] Since the electroacoustic conversion assembly, door device and vehicle provided in the present application include the protective cover described in any of the above technical solutions, they can solve the same problem and achieve the same effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A perspective view of a protective cover provided for some embodiments of the present application;

[0026] Figure 2 for Figure 1A schematic diagram of the cross-sectional structure of the protective cover shown;

[0027] Figure 3 Schematic diagram of a protective cover provided for some embodiments of the present application;

[0028] Figure 4 is a graph showing the change in phase delay of the sound channel to the sound wave as a function of the length of the partition;

[0029] Figure 5 A perspective view of a protective cover provided for some embodiments of the present application;

[0030] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of the protective cover shown;

[0031] Figure 7 Schematic diagram of a protective cover provided for some other embodiments of the present application;

[0032] Figure 8 for Figure 6 A graph showing the relationship between the length of the partition in the rightmost sound channel of the protective cover and the phase delay;

[0033] Figure 9 This is a simulation experiment model diagram of the working conditions of Example 1, Example 2 and the original working condition of this application; wherein, Figure 9 (a) in the figure shows the experimental model diagram of the original working condition. Figure 9 (b) is the experimental model diagram of the working condition of Example 1, Figure 9 (c) is the experimental model diagram of the working condition of Example 2;

[0034] Figure 10 for Figure 9 Frequency response curves of the measuring points of the three types of protective covers shown;

[0035] Figure 11 Passed the actual vehicle test Figure 9 The frequency response curves of the sound waves that reach the microphone directly without being reflected by the three protective covers are shown.

[0036] Reference numerals:

[0037] 10. Protective cover; 1. Grille; 11. First grille; 12. Second grille; 2. Sound channel; 3. Partition; 31. First partition; 32. Second partition; S1. First surface; S2. Second surface; a. First end; b. Second end; Q1. First area; Q2. Second area; Q11. First half area; Q12. Second half area; 1a. First flat plate portion; 1b. Second flat plate portion; 1c. Third flat plate portion; 4. First side panel; 5. Second side panel. DETAILED DESCRIPTION

[0038] In the embodiments of the present application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of the features.

[0039] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0040] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0041] In the embodiments of the present application, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement being discussed and the errors associated with the measurement of a specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0042] The electroacoustic converter described in the present application can be not only a device that converts an electrical signal into a sound signal, such as a speaker, a receiver, etc., but also a device that converts a sound signal into an electrical signal, such as a microphone, etc. The electroacoustic converter has a sound side. When the electroacoustic converter is a device that converts an electrical signal into a sound signal, the sound side is the sound output side of the electroacoustic converter; when the electroacoustic converter is a device that converts a sound signal into an electrical signal, the sound side is the sound input side of the electroacoustic converter. When the electroacoustic converter is installed in a scenario such as a vehicle door, the sound signal output along the sound output surface or input along the sound input surface of the electroacoustic converter is usually stronger on the sound side, and the sound signal output or input to the side is weaker. This makes the electroacoustic converter less effective in some scenarios where it is misaligned with the sound receiving end or transmitting end, such as when the electroacoustic converter on the vehicle door is misaligned with the user's ear (sound receiving end) on the seat.

[0043] Embodiments of the present application provide a protective cover that is positioned on the sound side of an electroacoustic transducer to protect the transducer and prevent dust, debris, or the user from contacting the transducer. The protective cover also allows sound signals to pass through, enabling input or output of sound signals. Furthermore, the protective cover provided in embodiments of the present application is further configured to guide sound signals for steering purposes.

[0044] See also Figure 1 and Figure 2 , Figure 1 A perspective view of a protective cover 10 provided in some embodiments of the present application, Figure 2 for Figure 1 The cross-sectional structure diagram of the protective cover 10 is shown. The protective cover 10 is used to protect the above-mentioned electroacoustic converter. The protective cover 10 may include a plurality of grilles 1 arranged in sequence along a first direction (i.e., the X direction), a sound channel 2 is formed between two adjacent grilles 1, and multiple sound channels 2 are formed between multiple grilles 1. For example Figure 2 In the illustrated embodiment, the number of grilles is six, forming five sound channels 2. When the protective cover is mounted on the sound side of the electroacoustic converter, the sound signal generated by the electroacoustic converter can be transmitted via the multiple sound channels 2 to the side of the protective cover 10 facing away from the electroacoustic converter, or the sound signal from the external environment can be transmitted to the electroacoustic converter via the multiple sound channels 2.

[0045] Along the X direction, the sound wave phase delay of multiple sound channels 2 gradually increases, and the sound wave phase delay interval between every two adjacent sound channels 2 is equal. For example, see Figure 3 , Figure 3 The schematic diagram of the protective cover 10 (also known as metamaterial) provided in some embodiments of the present application. One end of the protective cover is the incident sound wave, and the other end is the outgoing sound wave. The number of sound channels 2 in the protective cover 10 is N, for example, Figure 2In the illustrated embodiment, the number of grilles 1 is 6, N=5, and sound waves are transmitted simultaneously in these N sound channels 2. The phase delay of the protective cover 10 at the output end satisfies a gradient change relationship. For example, the phase delay of the first sound channel 2 is 0, and the phase delay of the Nth sound channel 2 is 1.9π. Then the phase delay interval between two adjacent sound channels 2 is 1.9π / (N-1), the phase delay of the second sound channel 2 is 1.9π / (N-1), and the phase delay of the third sound channel 2 is 2×1.9π / (N-1). By analogy, the phase delay of the N-1th sound channel 2 is (N-2)×1.9π / (N-1).

[0046] According to the generalized Snell's Law, when the sound wave is incident on the surface of the protective cover 10, the incident angle θ of the sound wave is i 、The emission angle of the sound wave θ t , acoustic wavelength λ, phase gradient of protective cover 10 The following relationship is satisfied:

[0047]

[0048] It can be seen that when the phase gradient of the protective cover 10 When it is greater than 0, the incident angle θ of the sound wave i The angle of emission of the sound wave θ t The unequal directions can cause deflection, thereby causing the propagation direction of the sound wave passing through the protective cover to be deflected relative to the propagation direction of the sound wave entering the protective cover.

[0049] When the phase delay of the first sound channel 2 is 0, the phase delay of the Nth sound channel 2 is 1.9π, the phase delay interval between two adjacent sound channels 2 is 1.9π / (N-1), the incident wave frequency is 2400 Hz, and L = 15 cm, the deflection angle of the sound signal can be calculated to be 64° according to the above expression (1).

[0050] Since in the protective cover provided by the present application, the sound wave phase delay of multiple sound channels 2 gradually increases along the X direction, and the sound wave phase delay interval between each two adjacent sound channels 2 is equal, the protective cover not only has a physical protective effect on the electroacoustic converter, but also affects the transmission direction of the sound, causing the sound to turn, and increasing the intensity of the lateral output or received sound signal, so as to achieve the use effect in the scenario where the electroacoustic converter and the sound receiving end or transmitting end are misaligned.

[0051] In order to meet the needs of scenarios with large misalignment, it is necessary to increase the deflection angle between the incident and outgoing sound waves as much as possible. According to the above expression (1), in order to achieve the largest possible deflection angle, the phase gradient of the protective cover 10 needs to be increased. To increase the phase gradient, there are two ways: one is to increase the total phase change, and the other is to reduce the gradient change linearity of the protective cover 10.

[0052] It can be known that when a sound wave propagates in the sound channel 2, its phase delay is proportional to the time required for the sound wave to pass through the sound channel 2. The longer the propagation time, the greater the phase delay.

[0053] Based on this, in some embodiments, please continue to refer to Figure 2 At least a portion of the sound channels 2 is provided with a partition 3. This partition 3 is used to increase the path difference between two adjacent sound channels 2, thereby increasing the acoustic phase delay interval between each pair of adjacent sound channels 2. By increasing the path difference between two adjacent sound channels 2 through the partition 3, the deflection angle between the incident and outgoing sound waves can be increased. Furthermore, this eliminates the need to extend the length of the sound channels 2 along the thickness direction of the protective cover 10, thereby maintaining the thickness of the protective cover 10 and facilitating a thinner design.

[0054] Of course, in some other embodiments, the length of part of the sound channel 2 along the thickness direction of the protective cover 10 may be extended to increase the difference in the paths of two adjacent sound channels 2. This application does not impose any specific limitation on this.

[0055] The structure of the partition 3 can be various. In some embodiments, see Figure 2 The two grilles forming the sound channel 2 are the first grille 11 and the second grille 12. The partition 3 includes at least one first partition 31 and at least one second partition 32. The first partition 31 extends from the first grille 11 to the second grille 12 and is spaced apart from the second grille 12. The second partition 32 extends from the second grille 12 to the first grille 11 and is spaced apart from the first grille 11. Along the extension direction of the sound channel 2, at least one first partition and at least one second partition are staggered and spaced apart in sequence. In this way, the sound channel 2 can be extended in a serpentine shape by at least one first partition 31 and at least one second partition 32, which can effectively increase the difference in length between two adjacent sound channels 2 without increasing the thickness of the protective cover 10.

[0056] In the above embodiment, along the extension direction of the sound channel 2, one second partition 32 may be provided between two adjacent first partitions 31, or multiple second partitions 32 may be provided; and one first partition 31 may be provided between two adjacent second partitions 32, or multiple first partitions 31 may be provided. This application exemplifies the embodiment in which one second partition 32 is provided between two adjacent first partitions 31, and one first partition 31 is provided between two adjacent second partitions 32. This improves uniformity and, under the premise that the thickness of the protective cover 10 is constant, facilitates increasing the difference in length between two adjacent sound channels 2.

[0057] In some embodiments, see Figure 2 , along the first direction X, the lengths of the partitions 3 in the plurality of sound channels 2 gradually increase. Figure 4 , Figure 4 is the curve of the phase delay of the sound wave of the sound channel 2 changing with the length of the partition 3, Figure 3 As can be seen, as the length of the partition 3 increases, the phase delay of the sound channel 2 also gradually increases. Therefore, along the first direction X, the length of the partition 3 within multiple sound channels 2 gradually increases, which can gradually increase the phase of the sound channel 2. This structure is simple and easy to implement.

[0058] In some embodiments, please refer to Figure 1 and Figure 2 , the grid 1 is in a flat plate shape. Like this, it is convenient to process and shape, and reduces cost.

[0059] In some embodiments, the distances between two adjacent grids 1 along the first direction X are equal. In this way, the sound waves are evenly distributed and can be effectively diverted.

[0060] In some embodiments, see Figure 5 and Figure 6 , Figure 5 This is a schematic structural diagram of a protective cover 10 provided in some embodiments of the present application. Figure 6 for Figure 5 The protective cover 10 is a schematic diagram of a cross-sectional structure. The protective cover 10 includes a first surface S1 and a second surface S2 facing each other. When the protective cover 10 is applied to an electroacoustic transducer, the first surface S1 can face the electroacoustic transducer, or the second surface S2 can face the electroacoustic transducer.

[0061] Based on the above, along the extension direction of sound channel 2, the end of grille 1 located on first surface S1 is first end a, and the end of grille 1 located on second surface S2 is second end b. The length occupied by the first ends a of the plurality of grilles 1 in the first direction X is a first length L1, and the length occupied by the second ends b of the plurality of grilles 1 in the first direction X is a second length L2. The first length L1 is greater than the second length L2.

[0062] In this way, the two ends of the protective cover 10 are of different widths, and the sound wave running time in each sound channel 2 is different, so that the sound waves passing through multiple sound channels 2 have different phase delays.

[0063] The phase delay of the entire protective cover 10 on the second surface S2 still satisfies the gradient change relationship. For example, see Figure 7 , Figure 7 The schematic diagram of the protective cover 10 (ie, metamaterial) provided in some embodiments of the present application, the phase delay of the first sound channel 2 is 0, the phase delay of the Nth sound channel 2 is 0.95π, and the phase delay interval between adjacent units is The phase delay of the second unit is The phase delay of the third unit is By analogy, the phase delay of the N-1th unit is At this time, optionally, the first length L1 of the protective cover 10 is L, but the second length L2 is L / 2, so that the phase gradient of the protective cover 10 on the transmission side is When the incident wave frequency is 2400Hz, L = 15cm, the incident wave θ i = 0, then the angle of the transmitted wave is θ t =65°, that is, the protective cover 10 deflects the propagation direction of the sound wave by 65°.

[0064] In some embodiments, see Figure 6 The first length L1 is greater than or equal to 1.8 times the second length L2, and less than or equal to 2.2 times the second length L2. In other words, the first length L1 is approximately twice the second length L2. This creates a more reasonable design, balancing both smooth sound transmission and deflection angle.

[0065] In some embodiments, see Figure 6 The spacing between the first ends a of each adjacent grille 1 in the first direction X is equal and is a first spacing d1. The spacing between the second ends b of each adjacent grille 1 in the first direction X is equal and is a second spacing d2. The first spacing d1 is greater than or equal to 1.8 times the second spacing d2 and less than or equal to 2.2 times the second spacing d2. This creates a more reasonable design, balancing smooth sound transmission and deflection angle.

[0066] In some embodiments, the area occupied by the first ends a of the plurality of grilles 1 on the first surface S1 is a first area Q1, and the area occupied by the second ends b of the plurality of grilles 1 on the second surface S2 is a second area Q2. The first area Q1 is divided into a first half area Q11 and a second half area Q12 arranged along the first direction X. The orthographic projection of the second area Q2 on the first area Q1 overlaps with the first half area Q11, and the second half area Q12 is located outside the orthographic projection of the second area Q2 on the first area Q1. In this way, the length of the sound channel 2 gradually increases along the first direction X, thereby gradually increasing the phase delay of the sound signal. This structure is simple and the design is reasonable.

[0067] In some embodiments, at least a portion of the grid 1 extends from the first end a to the second end b in a curved line or a broken line.

[0068] For examples, see Figure 6 At least part of the grille 1 comprises a first flat portion 1a, a second flat portion 1b, and a third flat portion 1c, arranged sequentially from the first end a to the second end b. The first and third flat portions 1a, 1c are parallel to the thickness of the protective cover 10, while the second flat portion 1b is perpendicular to the thickness of the protective cover 10 and connects between the first and third flat portions 1a, 1c. This allows the grille 1 to extend along the fold line, with adjacent portions perpendicular to each other, facilitating shaping and positioning.

[0069] In some embodiments, please refer to Figure 6 A partition 3 can be set in the sound channel 2. The partition 3 can increase the sound wave phase delay interval between each two adjacent sound channels 2 and increase the deflection angle between the incident sound wave and the outgoing sound wave.

[0070] In some embodiments, see Figure 1 and Figure 5 The protective cover 10 further includes a first side panel 4 and a second side panel 5, which are located on opposite sides of the plurality of grilles 1. The opposite ends of the plurality of grilles 1 are connected to the first side panel 4 and the second side panel 5, respectively. In this way, the plurality of grilles 1 can be connected into a whole by the first side panel 4 and the second side panel 5, which facilitates transportation and assembly.

[0071] In some embodiments, the deflection angle of the sound wave emission direction of the protective cover 10 relative to the sound wave incident direction of the protective cover 10 is greater than or equal to 60 degrees. In this way, the phase of each sound channel 2 can be fine-tuned by adjusting the length of the partition 3, see Figure 8 , Figure 8 for Figure 6The relationship curve diagram shows the relationship between the length of the partition in the rightmost sound channel 2 of the protective cover 10 and the phase delay, thereby forming a phase gradient relationship between the phase delays of the various sound channels 2 of the entire embodiment, thereby achieving the required steering function.

[0072] See also Figure 9 , Figure 9 The simulation experiment model diagrams of the working conditions of Example 1, Example 2 and the original working conditions are given. Figure 9 (a) in the figure shows the experimental model diagram of the original working condition. Figure 9 (b) is the working condition of Example 1 (that is, Figure 1 The experimental model diagram of the protective cover 10) is shown. Figure 9 (c) is the working condition of Example 2 (that is, Figure 5 Experimental model diagram of the protective cover 10).

[0073] Three types of protective covers are placed on the sound output side of the speaker. The speaker emits the same sound waves. A measuring point is taken at a position 50cm above the protective cover, at an angle of 75° to the normal of the protective cover, and the frequency response curves of the measuring points of the three protective covers are compared. Figure 10 As shown. Figure 10 It can be seen that the frequency response curves of the working conditions of Example 1 and Example 2 of the present application are better than those of the original working conditions in the direction of 75° deviation from the normal line of the speaker, achieving a good sound steering effect, which is far better than that of ordinary mesh covers, and objective data proves that the present invention improves the listening experience.

[0074] At the same time, a real vehicle test was conducted. The protective covers described in the original working condition, the working condition of Example 1, and the working condition of Example 2 were respectively covered on the surface of the mesh cover of the mid-bass speaker on the front passenger door. A microphone was placed in front of the headrest to make the speaker on the front passenger door emit a pulse signal. The signal collected by the microphone was then analyzed, and the frequency response curve of the sound wave that directly reaches the microphone without being reflected by the mesh cover was obtained as follows: Figure 11 As shown. Figure 11 It can be seen that within the ultra-wide frequency band of mid-low frequencies between 500Hz and 4000Hz, the frequency response curves of the two typical embodiments at the measuring points are better than the original state. In other words, applying the present invention to vehicle doors can effectively improve the frequency response curve at the position diagonally above the mesh cover, that is, at the position of the human ear, so that passengers in the car can have a better listening experience.

[0075] The present application also provides an electroacoustic conversion component, which includes an electroacoustic converter and the protective cover described in any of the above embodiments, and the protective cover is arranged on the sound side of the electroacoustic converter.

[0076] The present application also provides a vehicle door device, which includes a door body and the electroacoustic conversion component as described in the above embodiment, and the electroacoustic conversion component is arranged on the door body.

[0077] The present application also provides a vehicle, which includes the protective cover as described in any one of the above embodiments, the electroacoustic conversion component as described in the above embodiments, or the door device as described in the above embodiments.

[0078] Since the electroacoustic conversion assembly, door device and vehicle provided in the present application include the protective cover described in any of the above embodiments, they can solve the same problem and achieve the same effect.

[0079] In the description of the embodiments of the present application, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0080] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A protective cover (10) for protecting an electroacoustic converter, characterized in that: The protective cover (10) comprises a plurality of grilles (1) arranged in sequence along a first direction, a sound channel (2) is formed between two adjacent grilles (1), and a plurality of sound channels (2) are formed between the plurality of grilles (1); Along the first direction, the sound wave phase delays of the multiple sound channels (2) gradually increase, and the sound wave phase delay intervals between every two adjacent sound channels (2) are equal, so that the transmission direction of the sound wave passing through the protective cover (10) is deflected relative to the transmission direction of the sound wave entering the protective cover (10).

2. The protective cover (10) according to claim 1, characterized in that At least part of the sound channels (2) is provided with a partition (3), and the partition (3) is used to increase the difference between the paths of two adjacent sound channels (2), so as to increase the sound wave phase delay interval between each two adjacent sound channels (2).

3. The protective cover (10) according to claim 2, characterized in that The two grilles (1) forming the sound channel (2) are respectively a first grille (11) and a second grille (12); the partition (3) comprises at least one first partition (31) and at least one second partition (32); the first partition (31) extends from the first grille (11) to the second grille (12) and is spaced apart from the second grille (12); the second partition (32) extends from the second grille (12) to the first grille (11) and is spaced apart from the first grille (11); Along the extension direction of the sound channel (2), the at least one first partition (31) and the at least one second partition (32) are sequentially staggered and spaced apart.

4. The protective cover (10) according to claim 3, characterized in that Along the extension direction of the sound channel (2), a second partition (32) is provided between two adjacent first partitions (31), and a first partition (31) is provided between two adjacent second partitions (32).

5. The protective cover (10) according to claim 2, characterized in that Along the first direction, the lengths of the partitions (3) within the plurality of sound channels (2) gradually increase.

6. The protective cover (10) according to claim 1, characterized in that The grid (1) is in the shape of a flat plate.

7. The protective cover (10) according to claim 6, characterized in that The distances between each two adjacent grids (1) along the first direction are equal.

8. The protective cover (10) according to any one of claims 1 to 5, characterized in that: The protective cover (10) comprises a first surface (S1) and a second surface (S2) opposite to each other; Along the extension direction of the sound channel (2), the end of the grille (1) located on the first surface (S1) is the first end (a), and the end of the grille (1) located on the second surface (S2) is the second end (b); The first ends of the plurality of grilles (1) occupy a first length in the first direction, and the second ends of the plurality of grilles (1) occupy a second length in the first direction, and the first length is greater than the second length.

9. The protective cover (10) according to claim 8, characterized in that The first length is greater than or equal to 1.8 times the second length and less than or equal to 2.2 times the second length.

10. The protective cover (10) according to claim 8, characterized in that The spacing between the first ends of each adjacent two grids (1) in the first direction is equal and is the first spacing, the spacing between the second ends of each adjacent two grids (1) in the first direction is equal and is the second spacing, and the first spacing is greater than or equal to 1.8 times the second spacing and less than or equal to 2.2 times the second spacing.

11. The protective cover (10) according to claim 8, characterized in that The first ends of the plurality of grids (1) occupy an area on the first surface (S1) as a first area (Q1), the second ends of the plurality of grids (1) occupy an area on the second surface (S2) as a second area (Q2), the first area (Q1) is divided into a first half area (Q11) and a second half area (Q12) arranged along the first direction; the orthographic projection of the second area (Q2) on the first area (Q1) overlaps with the first half area (Q11), and the second half area (Q12) is located outside the orthographic projection of the second area (Q2) on the first area (Q1).

12. The protective cover (10) according to claim 8, characterized in that At least a portion of the grid (1) extends from the first end to the second end in a curved line or a broken line.

13. The protective cover (10) according to claim 12, characterized in that At least part of the grille (1) comprises a first flat portion (1a), a second flat portion (1b) and a third flat portion (1c) arranged in sequence from the first end to the second end, the first flat portion (1a) and the third flat portion (1c) being parallel to the thickness direction of the protective cover (10), the second flat portion (1b) being perpendicular to the thickness direction of the protective cover (10), and the second flat portion (1b) being connected between the first flat portion (1a) and the third flat portion (1c).

14. The protective cover (10) according to claim 1, characterized in that It also includes a first side plate (4) and a second side plate (5) opposite to each other, wherein the first side plate (4) and the second side plate (5) are respectively located on opposite sides of the plurality of grilles (1), and opposite ends of the plurality of grilles (1) are respectively connected to the first side plate (4) and the second side plate (5).

15. The protective cover (10) according to claim 1, characterized in that The deflection angle of the sound wave emission direction of the protective cover (10) relative to the sound wave incident direction of the protective cover (10) is greater than or equal to 60°.

16. An electroacoustic conversion component, characterized in that: The invention comprises an electroacoustic converter and a protective cover (10) according to any one of claims 1 to 15, wherein the protective cover (10) is arranged on the sound side of the electroacoustic converter.

17. A vehicle door device, characterized in that: It comprises a door body and the electroacoustic conversion component according to claim 16, wherein the electroacoustic conversion component is arranged on the door body.

18. A vehicle, characterized in that: The invention comprises the protective cover (10) according to any one of claims 1 to 15, the electroacoustic conversion component according to claim 16, or the vehicle door device according to claim 17.

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