Waterproof sound-transmitting film assembly

Abstract

The utility model provides a waterproof sound-transmitting film assembly. The waterproof sound-transmitting film assembly comprises a first bonding layer, a waterproof sound-transmitting film, a second bonding layer, a reinforcing layer, a third bonding layer and a sealing foam layer which are sequentially stacked from bottom to top, holes are formed in the first bonding layer, the second bonding layer, the reinforcing layer, the third bonding layer and the sealing foam layer; the inner diameters of the holes of the second bonding layer, the reinforcing layer, the third bonding layer and the sealing foam layer are consistent and are d2; the inner diameter of the opening of the first bonding layer is d1, the inner diameter of the opening from the second bonding layer to the sealing foam layer is larger than the inner diameter of the opening of the first bonding layer, an annular clearance area is formed, and the difference between the inner diameters of the annular clearance area and the first bonding layer is X; the bandwidth of the annular clearance area is t, d2 = d1 + 2t, and X = 2t; the ratio of t to d2 is 5-15%. According to the utility model, the audio performance of the waterproof sound-transmitting film assembly under a high compression ratio can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of acoustic electronic product accessories, in particular to a waterproof sound-permeable membrane component. Background Art

[0002] With the development of science and technology, the promotion of the Internet of Things and 5G / 6G technologies, more and more electronic devices require waterproof and sound-transmitting functions. For many acoustic electronic products (such as mobile phones and headphones), in order to ensure good dustproof and waterproof and breathable and sound-transmitting properties, waterproof and sound-transmitting membrane components are usually installed between the microphone and the shell. However, in actual applications, in order to ensure sealing, these components are often compressed to a large extent, which will cause their acoustic performance to drop significantly, thus affecting the audio effect of the product and resulting in poor audio consistency in mass-produced product batches. Although the traditional four-layer structure (glue-membrane-glue-foam) can provide certain waterproof and sound-transmitting functions, it performs poorly under high compression rates and cannot meet the needs of high-performance audio products.

[0003] Therefore, the utility model provides a waterproof sound-permeable membrane assembly, which includes a first adhesive layer, a waterproof sound-permeable membrane, a second adhesive layer, a reinforcement layer, a third adhesive layer and a sealing foam layer. Through a specially designed structure, excellent acoustic performance can be maintained even under high compression rates, solving the problem of audio performance impairment of traditional components under high compression rates, and greatly improving the audio consistency of mass-produced products. Utility Model Content

[0004] The utility model aims to provide a waterproof sound-permeable membrane assembly, which solves the problem that the audio performance of traditional assemblies is damaged at high compression rates, so as to achieve excellent acoustic performance even under large compression conditions. To achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A waterproof sound-permeable membrane assembly, comprising a first adhesive layer, a waterproof sound-permeable membrane, a second adhesive layer, a reinforcing layer, a third adhesive layer and a sealing foam layer stacked in sequence from bottom to top; the first adhesive layer, the second adhesive layer, the reinforcing layer, the third adhesive layer and the sealing foam layer are all provided with openings;

[0006] The inner diameters of the openings of the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are consistent;

[0007] The inner diameter of the opening from the second adhesive layer to the sealing foam layer is larger than the inner diameter of the opening of the first adhesive layer, forming an annular air-avoiding area, and the difference in the inner diameters of the two is X;

[0008] The inner diameters of the openings of the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are d2, the inner diameter of the openings of the first adhesive layer is d1, the bandwidth of the annular air-avoiding area is t, and d2=d1+2t, X=2t;

[0009] t:d2=4~99%.

[0010] Furthermore, the t:d2=5~50%.

[0011] Furthermore, the t:d2=5~15%.

[0012] Furthermore, the openings on the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are coaxially arranged to form a coaxial through-hole structure.

[0013] Furthermore, the openings on the first adhesive layer, the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are coaxially arranged.

[0014] Furthermore, the thickness of the sealing foam layer is h, and the ratio of h:t is 1-6:1.

[0015] Furthermore, the h:t=1~5:1.

[0016] Furthermore, the thickness h of the sealing foam layer is 0.1-1 mm.

[0017] Furthermore, there are no excessive restrictions on the outer diameter of the component. In addition, the inner dimension of the product is a polygonal structure. Similarly, the same effect can be achieved by ensuring that the bandwidth of the air avoidance area is t. For example, the inner dimension of the opening of the first adhesive layer is a quadrilateral structure with a side length of L1 and a bandwidth of t. The inner dimension of the opening from the second adhesive layer to the sealing foam layer is a quadrilateral L2, then L2=L1+2t.

[0018] Furthermore, the waterproof sound-permeable membrane is a polyurethane membrane, and the thickness of the waterproof sound-permeable membrane is 0.002~0.1mm; the waterproof sound-permeable membrane has excellent waterproofness and air permeability, and can still maintain good acoustic performance under high compression rate, and the waterproof sound-permeable membrane is made of a variety of non-fluorine polymers to improve environmental protection and safety.

[0019] Furthermore, the material of the reinforcement layer includes but is not limited to PET, and the thickness of the reinforcement layer is 0.01~0.15mm; as a high-strength supporting layer, the upper structure is greatly compressed and the large deformation caused cannot be transmitted to the lower structure, that is, the deformation caused by the lateral expansion caused by the compression of the component in the thickness direction cannot be transmitted to the waterproof sound-permeable membrane layer; thereby maintaining good acoustic performance; while enhancing the compression resistance of the entire component without affecting its acoustic performance.

[0020] Furthermore, the first adhesive layer, the second adhesive layer, and the third adhesive layer are glue layers, the thickness of each glue layer is 0.01~0.15mm, and the material of the glue layer is pressure-sensitive adhesive or heat-sensitive adhesive or waterproof foam adhesive or UV adhesive; the thickness of the first adhesive layer, the second adhesive layer, and the third adhesive layer are the same or different.

[0021] Furthermore, the sealing foam layer is a polyurethane foam layer or a silicone foam layer. The sealing foam layer is the outermost layer and plays a final sealing role. It is often used to fit tightly with the shell of the product. After installation, it generally has a large compression deformation to ensure sealing and prevent external particles and moisture from invading. In addition, the sealing foam layer is made of polyurethane, which has good resilience and can quickly return to its original shape after compression.

[0022] Furthermore, the third adhesive layer connects the reinforcement layer and the sealing foam layer to ensure that each layer is tightly combined.

[0023] Furthermore, the material selection for all layers needs to consider durability and adaptability to environmental conditions (such as temperature and humidity).

[0024] Furthermore, the waterproof sound-permeable membrane assembly can be used in scenarios under conventional compression rates, such as below 64%, and can also be used in scenarios under high compression rates, such as scenarios with a compression rate greater than 80%.

[0025] In the above technical solution, since the inner diameter of the opening of the first adhesive layer is smaller than that of the second adhesive layer to the sealing foam layer, an annular air avoidance area is formed above the waterproof sound-permeable membrane; when the component is compressed, the lateral deformation of the sealing foam layer due to the longitudinal compression can be absorbed by this air avoidance area, thereby protecting the waterproof sound-permeable membrane from deformation and maintaining its original acoustic properties; even under higher compression rate conditions, the component can still maintain excellent audio performance and will not affect the quality of sound transmission due to physical deformation.

[0026] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0027] 1. The utility model carefully designs the structure and size of each layer. Since the inner diameter of the opening of the first adhesive layer is smaller than that of the second adhesive layer to the sealing foam layer, an annular air-avoiding area is formed above the waterproof sound-permeable membrane, which successfully solves the problem that the acoustic performance of the traditional waterproof sound-permeable membrane assembly decreases under high compression conditions, thereby causing poor batch stability of the product; the compression rate of the waterproof sound-permeable membrane assembly can reach 88%;

[0028] 2. The membrane assembly of the utility model not only improves the waterproof performance of the product, but also ensures high-quality audio performance. The audio of the membrane assembly of the utility model is within 1 decibel, providing a better choice for acoustic electronic product manufacturers; in addition, it also helps to promote the application and development of green and environmentally friendly materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the waterproof sound-permeable membrane assembly of Example 1 of the utility model;

[0030] Figure 2 This is a front view of the waterproof sound-permeable membrane assembly of Example 1 of the utility model;

[0031] Figure 3 This is a schematic diagram of the structure of a traditional sound-transmitting membrane assembly of Comparative Example 2 of the present utility model;

[0032] Among them, 20 is the first adhesive layer, 21 is the waterproof and sound-permeable membrane, 22 is the second adhesive layer, 23 is the reinforcement layer, 24 is the third adhesive layer, 25 is the sealing foam layer, and 31 is the annular air-avoiding area. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned purposes, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner. Therefore, they only show the structures related to the utility model. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0035] Example 1

[0036] See attached Figure 1 And attached Figure 2 The present embodiment provides a waterproof sound-permeable membrane assembly, the waterproof sound-permeable membrane assembly comprises a first adhesive layer 20, a waterproof sound-permeable membrane 21, a second adhesive layer 22, a reinforcing layer 23, a third adhesive layer 24 and a sealing foam layer 25 which are stacked in sequence from bottom to top, and the first adhesive layer, the second adhesive layer, the reinforcing layer, the third adhesive layer and the sealing foam layer are all provided with openings;

[0037] The inner diameters of the openings of the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are consistent;

[0038] The inner diameter of the opening from the second adhesive layer to the sealing foam layer is larger than the inner diameter of the opening of the first adhesive layer, forming an annular air-avoiding area 31, and the difference in inner diameters between the two is X;

[0039] The inner diameters of the openings of the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are d2, the inner diameter of the openings of the first adhesive layer is d1, the bandwidth of the annular air-avoiding area is t, and d2=d1+2t, X=2t;

[0040] t:d2=4~99%;

[0041] Further, the t:d2=5~50%;

[0042] Further, the t:d2=5~15%;

[0043] Furthermore, the openings on the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are coaxially arranged to form a coaxial through-hole structure;

[0044] Furthermore, the openings on the first adhesive layer, the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are coaxially arranged;

[0045] Furthermore, the thickness of the sealing foam layer is h, and the ratio of h:t is 1 to 6:1;

[0046] Furthermore, the h:t=1~5:1;

[0047] Furthermore, the thickness h of the sealing foam layer is 0.1-1 mm;

[0048] Furthermore, there are no excessive restrictions on the outer diameter of the component. In addition, the inner dimension of the product is a polygonal structure. Similarly, the same effect can be achieved by ensuring that the bandwidth of the air avoidance area is t. For example, the inner dimension of the opening of the first adhesive layer is a quadrilateral structure with a side length of L1 and a bandwidth of t. The inner dimension of the opening from the second adhesive layer to the sealing foam layer is a quadrilateral L2, then L2=L1+2t;

[0049] Furthermore, the waterproof sound-permeable membrane is a polyurethane membrane, and the thickness of the waterproof sound-permeable membrane is 0.002-0.1 mm; the waterproof sound-permeable membrane has excellent waterproofness and air permeability, and can still maintain good acoustic performance under high compression rate, and the waterproof sound-permeable membrane is made of a variety of non-fluorine polymers to improve environmental protection and safety;

[0050] Furthermore, the material of the reinforcement layer includes but is not limited to PET, and the thickness of the reinforcement layer is 0.01-0.15 mm; as a high-strength support layer, the upper structure is greatly compressed and the large deformation generated cannot be transmitted to the lower structure, that is, the deformation caused by the lateral expansion caused by the compression of the component in the thickness direction cannot be transmitted to the waterproof sound-permeable membrane layer; thereby maintaining good acoustic performance; while enhancing the compression resistance of the entire component, its acoustic performance is not affected;

[0051] Furthermore, the first adhesive layer, the second adhesive layer, and the third adhesive layer are adhesive layers, the thickness of each adhesive layer is 0.01-0.15 mm, and the material of the adhesive layer is pressure-sensitive adhesive, heat-sensitive adhesive, waterproof foam adhesive, or UV adhesive; the thickness of the first adhesive layer, the second adhesive layer, and the third adhesive layer are the same or different;

[0052] Furthermore, the sealing foam layer is a polyurethane foam layer or a silicone foam layer. The sealing foam layer is the outermost layer and plays a final sealing role. It is often used to fit tightly with the shell of the product. After installation, it generally has a large compression deformation to ensure sealing and prevent external particles and moisture from invading. In addition, the sealing foam layer is made of polyurethane, which has good resilience and can quickly return to its original shape after compression.

[0053] Furthermore, the third adhesive layer connects the reinforcement layer and the sealing foam layer to ensure that the layers are tightly combined;

[0054] Furthermore, the material selection for all layers needs to consider durability and adaptability to environmental conditions (e.g., temperature, humidity);

[0055] Furthermore, the waterproof sound-permeable membrane assembly can be used in scenarios with conventional compression rates, such as below 64%, and can also be used in scenarios with high compression rates, such as scenarios with compression rates greater than 80%;

[0056] Furthermore, since the inner diameter of the opening of the first adhesive layer is smaller than that of the second adhesive layer to the sealing foam layer, an annular air-avoiding area is formed above the waterproof sound-permeable membrane; when the component is compressed, the lateral deformation of the sealing foam layer caused by the longitudinal compression can be absorbed by this air-avoiding area, thereby protecting the waterproof sound-permeable membrane from deformation and maintaining its original acoustic properties; even under high compression rate conditions, the component can still maintain excellent audio performance, and the quality of sound transmission will not be affected by physical deformation;

[0057] Specifically, several implementation samples of this embodiment are:

[0058] Sample No. 7: glue-film-glue-PET-glue-foam; product thickness: 0.69mm; work height: 0.32mm; the thickness of the waterproof and sound-permeable membrane is 0.01mm; the thickness of each glue layer is 0.03mm; the thickness of the sealing foam layer is 0.53mm; the thickness of the PET layer is 0.06mm; the inner diameter d1 of the opening of the first adhesive layer is 1.6mm; the inner diameter d2 of the opening from the second adhesive layer to the sealing foam layer is 1.8mm; the bandwidth t of the annular air-avoiding area is 0.1mm;

[0059] Sample No. 8: glue-film-glue-PET-glue-foam; product thickness: 0.69mm; work height: 0.25mm; the thickness of the waterproof and sound-permeable membrane is 0.01mm; the thickness of each glue layer is 0.03mm; the thickness of the sealing foam layer is 0.53mm; the thickness of the PET layer is 0.06mm; the inner diameter d1 of the opening of the first adhesive layer is 1.6mm; the inner diameter d2 of the opening from the second adhesive layer to the sealing foam layer is 2.0mm; the bandwidth t of the annular air-avoiding area is 0.2mm;

[0060] Sample No. 9: glue-film-glue-PET-glue-foam; product thickness: 0.69mm; work height: 0.32mm; the thickness of the waterproof and sound-permeable membrane is 0.01mm; the thickness of the first adhesive layer is 0.05mm; the thickness of the second adhesive layer and the third adhesive layer is 0.03mm; the thickness of the sealing foam layer is 0.53mm; the thickness of the PET layer is 0.04mm; the inner diameter d1 of the opening of the first adhesive layer is 1.6mm; the inner diameter d2 of the opening from the second adhesive layer to the sealing foam layer is 1.8mm; the bandwidth t of the annular air-avoiding area is 0.1mm;

[0061] Sample No. 10: glue-film-glue-PET-glue-foam; product thickness: 0.72mm; work height is 0.25mm; the thickness of the waterproof and sound-permeable membrane is 0.01mm; the thickness of the first adhesive layer is 0.05mm; the thickness of the second adhesive layer and the third adhesive layer is 0.03mm; the thickness of the sealing foam layer is 0.53mm; the thickness of the PET layer is 0.07mm; the inner diameter d1 of the opening of the first adhesive layer is 1.6mm; the inner diameter d2 of the opening from the second adhesive layer to the sealing foam layer is 2.0mm; the bandwidth t of the annular air avoidance area is 0.2mm.

[0062] Example 2

[0063] This embodiment is carried out on the basis of sample No. 10 of embodiment 1. In sample No. 11 of this embodiment, the inner diameter d1 of the opening of the first adhesive layer is 1.6 mm; the inner diameter d2 of the opening from the second adhesive layer to the sealing foam layer is 2.2 mm; and the bandwidth t of the annular air avoidance area is 0.3 mm.

[0064] Example 3

[0065] This embodiment is an 8-layer structure including glue-film-glue-PET-glue-foam, specifically glue-PET-glue-film-glue-PET-glue-foam. In this embodiment, a second reinforcement layer and a corresponding adhesive layer are arranged below the first adhesive layer and adhered to the first adhesive layer, and the inner diameter of the opening is consistent with that of the first adhesive layer.

[0066] Comparative Example 1

[0067] This comparative example is a 6-layer structure of glue-film-glue-PET-glue-foam. The pore sizes of all the laminated layers in this comparative example are all the same. The several samples in this comparative example are:

[0068] Sample No. 3: glue-film-glue-PET-glue-foam; product thickness: 0.68mm; work height: 0.32mm; the thickness of the waterproof and sound-permeable membrane is 0.01mm; the thickness of each glue layer is 0.03mm; the thickness of the sealing foam layer is 0.53mm; the thickness of the PET layer is 0.05mm;

[0069] Sample No. 4: glue-film-glue-PET-glue-foam; product thickness: 0.68mm; work height: 0.25mm; the thickness of the waterproof and sound-permeable membrane is 0.01mm; the thickness of each glue layer is 0.03mm; the thickness of the sealing foam layer is 0.53mm; the thickness of the PET layer is 0.05mm;

[0070] Sample No. 5: glue-film-glue-PET-glue-foam; product thickness: 0.71mm; work height: 0.32mm; the thickness of the waterproof and sound-permeable membrane is 0.01mm; the thickness of the first adhesive layer is 0.05mm; the thickness of the second adhesive layer and the third adhesive layer is 0.03mm; the thickness of the sealing foam layer is 0.53mm; the thickness of the PET layer is 0.06mm;

[0071] Sample No. 6: glue-film-glue-PET-glue-foam; product thickness: 0.71mm; work height is 0.25mm; the thickness of the waterproof and sound-permeable membrane is 0.01mm; the thickness of the first adhesive layer is 0.05mm; the thickness of the second adhesive layer and the third adhesive layer is 0.03mm; the thickness of the sealing foam layer is 0.53mm; the thickness of the PET layer is 0.06mm.

[0072] Comparative Example 2

[0073] See attached Figure 3 This comparative example is a conventional sound-permeable membrane assembly in the prior art. The conventional sound-permeable membrane assembly includes a first adhesive layer 20, a waterproof sound-permeable membrane 21, a second adhesive layer 22 and a sealing foam layer 25 arranged from the inside to the outside. The samples of this comparative example are:

[0074] Sample No. 1: glue-film-glue-foam; product thickness: 0.69mm; work height: 0.32mm;

[0075] Sample No. 2: glue-film-glue-foam; product thickness: 0.69mm; work height: 0.25mm.

[0076] Comparative Example 3

[0077] This comparative example is carried out on the basis of sample No. 10 of Example 1. In sample No. 12 of this comparative example, the inner diameter d1 of the opening of the first adhesive layer is 1.6 mm; the inner diameter d2 of the opening from the second adhesive layer to the sealing foam layer is 1.73 mm; and the bandwidth t of the annular air avoidance area is 0.065 mm.

[0078] Comparative Example 4

[0079] This comparative example is carried out on the basis of sample No. 10 of Example 1. In sample No. 13 of this comparative example, the inner diameter d1 of the opening of the first adhesive layer is 1.6 mm; the inner diameter d2 of the opening from the second adhesive layer to the sealing foam layer is 1.72 mm; and the bandwidth t of the annular air avoidance area is 0.06 mm.

[0080] Comparative Example 5

[0081] The product thickness of sample No. 14 of this comparative example is: 0.72mm; the work height is 0.25mm; the thickness of the waterproof sound-permeable membrane is 0.01mm; the thickness of each adhesive layer is 0.02mm; the thickness of the sealing foam layer is 0.64mm; the thickness of the PET layer is 0.01mm; the inner diameter d1 of the opening of the first adhesive layer is 1.6mm; the inner diameter d2 of the opening from the second adhesive layer to the sealing foam layer is 1.8mm; the bandwidth t of the annular air avoidance area is 0.1mm.

[0082] Comparative Example 6

[0083] The product thickness of sample No. 15 of this comparative example is: 0.72mm; the work height is 0.25mm; the thickness of the waterproof sound-permeable membrane is 0.01mm; the thickness of each adhesive layer is 0.01mm; the thickness of the sealing foam layer is 0.67mm; the thickness of the PET layer is 0.01mm; the inner diameter d1 of the opening of the first adhesive layer is 1.6mm; the inner diameter d2 of the opening from the second adhesive layer to the sealing foam layer is 1.8mm; the bandwidth t of the annular air avoidance area is 0.1mm.

[0084] Several samples of comparative example 1 and the traditional sound-transmitting membrane assembly samples of comparative example 2 were tested to test the audio performance of different laminated assemblies at the same aperture. The test results are shown in Table 1.

[0085] Table 1

[0086]

[0087] Several samples of Example 1 and samples of Comparative Examples 3 to 6 were tested to test the audio performance of components with the same laminate at different apertures. The test results are shown in Table 2.

[0088] Table 2

[0089]

[0090] The samples of Comparative Examples 7 and 8 were tested to test the audio performance of components with the same laminate at different foam thicknesses. The test results are shown in Table 3.

[0091] Table 3

[0092]

[0093] The audio performance of the samples was tested at the same compression rate. The test results are shown in Table 4.

[0094] Table 4

[0095]

[0096] As can be seen from Table 1, three types of laminate structures were tested in the experiment. No. 1 and No. 2 are traditional 4-layer structures, while No. 3 and No. 4 are 6-layer structures with added reinforcement layers. No. 5 and No. 6 are also 6-layer structures, but the adhesive layer is thicker than that of the laminates of No. 3 and No. 4. The apertures of the laminate openings in the above structures are all the same. It can be seen from the test that the new 6-layer laminate with added reinforcement layer (PET) has obvious audio performance consistent with that of Example 1 at a compression rate of more than 80% and that of Example 2 at a compression rate of 70%, and the slight thickness change of the adhesive layer has no effect on the experimental results, which proves that the reinforcement layer has a good isolation effect on the deformation caused by compression, so that the overall compression capacity of the component is improved by more than 10%.

[0097] It can be seen from samples No. 11-13 in Table 2 that the new 6-layer laminated waterproof sound-permeable membrane assembly was experimentally tested to test the influence of the inner diameter of the opening of the first adhesive layer and the inner diameter of the opening from the second adhesive layer to the sealing foam layer on the audio. It can be seen from the experimental results that the maximum compression rate of the structural laminate with an inner diameter of the opening of the first adhesive layer of 1.6 mm and an inner diameter of the opening of the second adhesive layer to the sealing foam layer of 2.0 mm is 10% higher than that of the structural laminate with an inner diameter of the opening of the first adhesive layer of 1.6 mm and an inner diameter of the opening of the second adhesive layer to the sealing foam layer of 1.8 mm. That is, the ratio of the bandwidth t of the annular air avoidance area described in the utility model to the inner diameter d2 of the opening of the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer is controlled at t:d2=4~99%, and the best effect is achieved at 5~15%. It can be seen from samples No. 14 and No. 15 in Table 3 that if the ratio of the thickness h of the sealing foam layer to the bandwidth t of the annular air avoidance area exceeds 6, the foam compression rate and audio function will be greatly affected. Therefore, h:t=1~6:1 of the utility model is most suitable; it can be seen from Table 4 that when the same compression rate is given to the membrane assembly, the utility model can keep the audio within ±0.5dB at a smaller compression rate or a larger compression rate, while although the compression rate of samples No. 4 and No. 6 of comparative example 1 and sample No. 2 of comparative example 2 is improved, the audio performance will be greatly reduced, and even the audio will be discrete. Therefore, the utility model can still maintain good audio performance under a larger compression rate.

[0098] In summary, through experiments, it can be concluded that by adding a reinforcement layer in the stack and setting up an annular air avoidance area, the audio performance of the waterproof sound-permeable membrane assembly under high compression rate can be greatly improved, that is, under high compression state, the audio consistency of the product can still be maintained good.

[0099] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0100] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to the above embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the above embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A waterproof sound-permeable membrane assembly, characterized in that: The waterproof sound-permeable membrane assembly comprises a first adhesive layer, a waterproof sound-permeable membrane, a second adhesive layer, a reinforcement layer, a third adhesive layer and a sealing foam layer which are stacked in sequence from bottom to top; the first adhesive layer, the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are all provided with openings; The inner diameters of the openings of the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are consistent; The inner diameter of the opening from the second adhesive layer to the sealing foam layer is larger than the inner diameter of the opening of the first adhesive layer, forming an annular air-avoiding area, and the difference in the inner diameters of the two is X; The inner diameters of the openings of the second adhesive layer, the reinforcing layer, the third adhesive layer and the sealing foam layer are d2, the inner diameter of the openings of the first adhesive layer is d1, the bandwidth of the annular air-avoiding area is t, and d2=d1+2t, X=2t; t:d2=4~99%.

2. A waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The openings on the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are coaxially arranged.

3. A waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The openings on the first adhesive layer, the second adhesive layer, the reinforcement layer, the third adhesive layer and the sealing foam layer are coaxially arranged.

4. A waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The sealing foam layer is a polyurethane foam layer or a silicone foam layer; the thickness of the sealing foam layer is h, and h:t=1~6:

1.

5. A waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The t:d2=5~50%.

6. A waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The t:d2=5~15%.

7. A waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The first adhesive layer, the second adhesive layer and the third adhesive layer are glue layers, and the thickness of each glue layer is 0.01-0.15 mm.

8. The waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The waterproof sound-permeable membrane is a polyurethane membrane, and the thickness of the waterproof sound-permeable membrane is 0.002-0.1 mm.

9. The waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The thickness of the reinforcement layer is 0.01-0.15 mm.

10. The waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The material of the first adhesive layer, the second adhesive layer and the third adhesive layer is pressure-sensitive adhesive or heat-sensitive adhesive or waterproof foam adhesive or UV adhesive.

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