Waterproof sound-transmitting film assembly for mobile phone microphone

Abstract

The invention provides a waterproof sound-transmitting film assembly for a mobile phone microphone. 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; the inner diameter of the opening from the second bonding layer to the sealing foam layer is larger than that of the opening of the first bonding layer, so that an annular clearance area is formed, and the inner diameter difference between the two is X; the inner diameter of the holes of the second bonding layer, the reinforcing layer, the third bonding layer and the sealing foam layer is d2, the inner diameter of the hole of the first bonding layer is d1, the bandwidth of the annular clearance area is t, d2 = d1 + 2t, and X = 2t; the d1 ranges from 0.6 mm to 2.5 mm, and the t ranges from 0.1 mm to 0.5 mm. According to the invention, the audio performance of the waterproof sound-transmitting film assembly under a high compression ratio can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic electronic product accessories, and particularly relates to a waterproof and sound-permeable membrane assembly for a mobile phone microphone. Background Art

[0002] With the development of technology and the popularization of the Internet of Things and 5G / 6G technologies, more and more electronic devices require waterproof and sound-permeable functions. For many acoustic electronic products (such as mobile phones and earphones), in order to ensure good dust and water resistance and air and sound permeability, a waterproof and sound-permeable membrane assembly is usually installed between the microphone and the housing. However, in actual applications, in order to ensure the sealing performance, these assemblies are often compressed to a great extent, which will cause a significant decline in their acoustic performance, thereby affecting the audio effect of the product and resulting in poor audio consistency performance of mass-produced product batches. Although the traditional four-layer structure (adhesive - membrane - adhesive - foam) can provide certain waterproof and sound-permeable functions, it performs poorly under high compression rates and cannot meet the requirements of high-performance audio products.

[0003] Therefore, the present invention provides a waterproof and sound-permeable membrane assembly for a mobile phone microphone, which includes a first adhesive layer, a waterproof and sound-permeable membrane, a second adhesive layer, a reinforcing 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 impaired audio performance of traditional assemblies under high compression rates, and significantly improving the audio consistency of mass-produced products. Summary of the Invention

[0004] The invention object of the present invention is to provide a waterproof and sound-permeable membrane assembly for a mobile phone microphone, which solves the problem of impaired audio performance of traditional assemblies under high compression rates, so as to maintain excellent acoustic performance even under significant compression. To achieve the above object, the technical solution adopted by the present invention is:

[0005] A waterproof and sound-permeable membrane assembly for a mobile phone microphone, the waterproof and sound-permeable membrane assembly includes a first adhesive layer, a waterproof and sound-permeable membrane, a second adhesive layer, a reinforcing layer, a third adhesive layer, and a sealing foam layer which are sequentially stacked from bottom to top; openings are provided on the first adhesive layer, the second adhesive layer, the reinforcing layer, the third adhesive layer, and the sealing foam layer;

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

[0007] The inner diameter of the openings of the second adhesive layer to the sealing foam layer is larger than the inner diameter of the openings of the first adhesive layer, forming an annular clearance area, and the inner diameter difference between the two is X;

[0008] The inner diameter of the openings of the second adhesive layer, the reinforcement layer, the third adhesive layer, and the sealed foam layer is d2, the inner diameter of the openings of the first adhesive layer is d1, the bandwidth of the annular clearance area is t, and d2 = d1 + 2t, X = 2t;

[0009] d1 = 0.6 - 2.5 mm, t = 0.1 - 0.5 mm.

[0010] Further, d1 = 0.8 - 2.3 mm, t = 0.1 - 0.4 mm.

[0011] Further, d1 = 1.0 - 2.1 mm, t = 0.1 - 0.3 mm.

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

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

[0014] Further, the thickness of the sealed foam layer is h, and h:t = 1 - 6:1.

[0015] Further, h:t = 1 - 5:1.

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

[0017] Further, there are no excessive restrictions on the outer diameter of the component. In addition, when the inner dimension of the product is a polygonal structure, similarly, ensuring that the bandwidth of the clearance area is t can also achieve the same effect. For example, the inner dimension of the opening of the first adhesive layer is a quadrilateral structure with a side length of L1, the bandwidth of the clearance area is t, and the inner dimension of the opening of the second adhesive layer to the sealed foam layer is a quadrilateral L2, then L2 = L1 + 2t.

[0018] Further, 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 rates, and the waterproof sound-permeable membrane is made of a variety of non-fluoropolymers to improve environmental protection and safety.

[0019] Furthermore, the material of the reinforcing layer includes but is not limited to PET, and the thickness of the reinforcing layer is 0.01 - 0.15 mm. As a high-strength support layer, it enables the upper structure to be greatly compressed and generate large deformations that cannot be transmitted to the lower structure, that is, the deformation of the component caused by compression in the thickness direction and resulting in lateral expansion cannot be transmitted to the waterproof and sound-permeable membrane layer. Furthermore, good acoustic performance is maintained; while enhancing the compression resistance of the entire component, it does not affect its acoustic performance.

[0020] 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 or thermosensitive adhesive or waterproof foam adhesive or UV adhesive; the thicknesses 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 commonly used to closely fit with the housing of the product. After installation, there is generally a large compressive deformation to ensure sealing and prevent external particles and moisture from invading; and the sealing foam layer selects polyurethane, which has good resilience and can quickly return to its original state after compression.

[0022] Furthermore, the third adhesive layer connects the reinforcing layer and the sealing foam layer to ensure that all layers are closely combined.

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

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

[0025] In the above technical solution, since the inner diameter of the openings of the first adhesive layer is smaller than that of the second adhesive layer to the sealing foam layer, a ring-shaped clearance area is formed above the waterproof and sound-permeable membrane; when the component is compressed, the lateral deformation generated by the longitudinal compression of the sealing foam layer can be absorbed by this clearance area, thus protecting the waterproof and sound-permeable membrane from deformation and maintaining its original acoustic characteristics; even under conditions of a relatively high compression rate, 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 present invention has the following advantages compared with the prior art:

[0027] 1. Through the elaborate design of the structures and dimensions of each layer, since the inner diameter of the openings in the first adhesive layer is smaller than that from the second adhesive layer to the sealing foam layer, a ring-shaped clearance area is formed above the waterproof sound-permeable membrane, successfully solving the problem that the acoustic performance of traditional waterproof sound-permeable membrane assemblies deteriorates under high compression rates, resulting in poor batch stability of products; the compression rate of the waterproof sound-permeable membrane assembly can reach 88%.

[0028] 2. The membrane assembly of the present invention not only improves the waterproof performance of the product but also ensures high-quality audio performance. After compression, the batch frequency response range of the membrane assembly of the present invention is within 1 decibel, providing a better choice for acoustic electronic product manufacturers; in addition, it helps to promote the application and development of green environmental protection materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic structural diagram of the waterproof sound-permeable membrane assembly according to Embodiment 1 of the present invention;

[0030] Figure 2 Front view of the waterproof sound-permeable membrane assembly according to Embodiment 1 of the present invention;

[0031] Figure 3 Schematic structural diagram of the traditional sound-permeable membrane assembly according to Comparative Example 2 of the present invention;

[0032] Among them, 20 - the first adhesive layer, 21 - the waterproof sound-permeable membrane, 22 - the second adhesive layer, 23 - the reinforcing layer, 24 - the third adhesive layer, 25 - the sealing foam layer, 31 - the ring-shaped clearance area. DETAILED DESCRIPTION OF THE INVENTION

[0033] In order to more clearly understand the above-mentioned objects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention. It should be noted that, without conflict, the embodiments and features in the embodiments in this application can be combined with each other.

[0034] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0035] Embodiment 1

[0036] See the attached Figure 1 and the attached Figure 2, this embodiment provides a waterproof sound-permeable film assembly for a mobile phone microphone. The waterproof sound-permeable film assembly includes a first adhesive layer 20, a waterproof sound-permeable film 21, a second adhesive layer 22, a reinforcing layer 23, a third adhesive layer 24, and a sealing foam layer 25 that are 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;

[0037] The inner diameters of the openings in the second adhesive layer, the reinforcing layer, the third adhesive layer, and the sealing foam layer are the same;

[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 in the first adhesive layer, forming an annular clearance area 31, and the inner diameter difference between the two is X;

[0039] The inner diameter of the openings in the second adhesive layer, the reinforcing layer, the third adhesive layer, and the sealing foam layer is d2, the inner diameter of the opening in the first adhesive layer is d1, the bandwidth of the annular clearance area is t, and d2 = d1 + 2t, X = 2t;

[0040] d1 = 0.6 - 2.5 mm, t = 0.1 - 0.5 mm;

[0041] Further, d1 = 0.8 - 2.3 mm, t = 0.1 - 0.4 mm;

[0042] Further, d1 = 1.0 - 2.1 mm, t = 0.1 - 0.3 mm;

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

[0044] Further, the openings in the first adhesive layer, the second adhesive layer, the reinforcing layer, the third adhesive layer, and the sealing foam layer are coaxially arranged;

[0045] Further, the thickness of the sealing foam layer is h, and h:t = 1 - 6:1;

[0046] Further, h:t = 1 - 5:1;

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

[0048] Further, there are no excessive restrictions on the outer diameter of the assembly. In addition, if the inner size of the product is a polygonal structure, the same principle applies. As long as the bandwidth of the clearance area is t, the same effect can be achieved. For example, the inner size of the opening in the first adhesive layer is a quadrilateral structure with a side length of L1, the bandwidth of the clearance area is t, and the inner size of the opening from the second adhesive layer to the sealing foam layer is a quadrilateral L2, then L2 = L1 + 2t;

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

[0050] Further, the material of the reinforcing layer includes but is not limited to PET, and the thickness of the reinforcing layer is 0.01 - 0.15 mm; as a high-strength support layer, when the upper structure is greatly compressed and generates a large deformation, the deformation cannot be transmitted to the lower structure, that is, the deformation of the component caused by compression in the thickness direction resulting in lateral expansion cannot be transmitted to the waterproof sound-permeable film layer; thus maintaining good acoustic performance; while enhancing the compression resistance of the entire component without affecting its acoustic performance;

[0051] Further, 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 or thermosensitive adhesive or waterproof foam adhesive or UV adhesive; the thicknesses of the first adhesive layer, the second adhesive layer, and the third adhesive layer are the same or different;

[0052] Further, 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 closely fit with the housing of the product. After installation, there is generally a large compression deformation to ensure sealing and prevent external particles and moisture from invading; and the sealing foam layer selects polyurethane, and polyurethane has good resilience and can quickly return to its original state after compression;

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

[0054] Further, the material selection of all layers needs to consider durability and adaptability to environmental conditions (such as temperature, humidity);

[0055] Further, the waterproof sound-permeable film assembly can be used in scenarios with a conventional compression rate, such as below 64%, and can also be applicable to scenarios with a high compression rate, such as scenarios with a compression rate greater than 80%;

[0056] Furthermore, since the inner diameter of the opening in the first adhesive layer is smaller than that from the second adhesive layer to the sealing foam layer, a ring-shaped clearance area is formed above the waterproof sound-permeable membrane. When the component is compressed, the lateral deformation of the sealing foam layer caused by longitudinal compression can be absorbed by this clearance area, thus protecting the waterproof sound-permeable membrane from deformation and maintaining its original acoustic characteristics. Even under conditions of a relatively high compression rate, the component can still maintain excellent audio performance and will not affect the quality of sound transmission due to physical deformation.

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

[0058] Sample No. 7: glue - film - glue - PET - glue - foam; product thickness: 0.69 mm; working height: 0.32 mm; the thickness of the waterproof sound-permeable membrane is 0.01 mm; the thickness of each glue layer is 0.03 mm; the thickness of the sealing foam layer is 0.53 mm; the thickness of the PET layer is 0.06 mm; the inner diameter d1 of the opening in 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 1.8 mm; the bandwidth t of the ring-shaped clearance area is 0.1 mm;

[0059] Sample No. 8: glue - film - glue - PET - glue - foam; product thickness: 0.69 mm; working height: 0.25 mm; the thickness of the waterproof sound-permeable membrane is 0.01 mm; the thickness of each glue layer is 0.03 mm; the thickness of the sealing foam layer is 0.53 mm; the thickness of the PET layer is 0.06 mm; the inner diameter d1 of the opening in 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 2.0 mm; the bandwidth t of the ring-shaped clearance area is 0.2 mm;

[0060] Sample No. 9: glue - film - glue - PET - glue - foam; product thickness: 0.69 mm; working height: 0.32 mm; the thickness of the waterproof sound-permeable membrane is 0.01 mm; the thickness of the first adhesive layer is 0.05 mm; the thickness of the second adhesive layer and the third adhesive layer is 0.03 mm; the thickness of the sealing foam layer is 0.53 mm; the thickness of the PET layer is 0.04 mm; the inner diameter d1 of the opening in 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 1.8 mm; the bandwidth t of the ring-shaped clearance area is 0.1 mm;

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

[0062] Example 2

[0063] This example is based on Sample No. 10 of Example 1. In Sample No. 11 of this example, the inner diameter d1 of the opening in the first adhesive layer is 1.6 mm; the inner diameter d2 of the opening from the second adhesive layer to the sealed foam layer is 2.2 mm; the bandwidth t of the annular clearance area is 0.3 mm.

[0064] Example 3

[0065] This example is an 8 - layer structure including glue - film - glue - PET - glue - foam, specifically glue - PET - glue - film - glue - PET - glue - foam. In this example, a second reinforcing layer and a corresponding adhesive layer are provided below and adhered to the first adhesive layer, and the inner diameter of the opening is the same as 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. In this comparative example, the pore diameters of all laminations are the same. Several samples of this comparative example are as follows:

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

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

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

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

[0072] Comparative Example 2

[0073] See the appendix Figure 3 , this comparative example is a traditional sound - permeable film assembly in the prior art. The traditional sound - permeable film assembly sequentially includes a first adhesive layer 20, a waterproof sound - permeable film 21, a second adhesive layer 22, and a sealed foam layer 25 arranged from inside to outside in sequence; several samples of this comparative example are respectively:

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

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

[0076] Comparative Example 3

[0077] This comparative example is based on Sample No. 10 of Example 1. In Sample No. 12 of this comparative example, the inner diameter d1 of the opening in the first adhesive layer is 1.6 mm; the inner diameter d2 of the opening from the second adhesive layer to the sealed foam layer is 1.73 mm; the bandwidth t of the annular clearance area is 0.065 mm.

[0078] Comparative Example 4

[0079] This comparative example is based on Sample No. 10 of Example 1. In Sample No. 13 of this comparative example, the inner diameter d1 of the opening in the first adhesive layer is 1.6 mm; the inner diameter d2 of the opening from the second adhesive layer to the sealed foam layer is 1.72 mm; the bandwidth t of the annular clearance area is 0.06 mm.

[0080] Comparative Example 5

[0081] For the sample No. 14 of this comparative example, the thickness of the product is: 0.72 mm; the working height is 0.25 mm; the thickness of the waterproof sound-permeable membrane is 0.01 mm; the thickness of each adhesive layer is 0.02 mm; the thickness of the sealing foam layer is 0.64 mm; the thickness of the PET layer is 0.01 mm; 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 1.8 mm; the bandwidth t of the annular clearance area is 0.1 mm.

[0082] Comparative Example 6

[0083] For the sample No. 15 of this comparative example, the thickness of the product is: 0.72 mm; the working height is 0.25 mm; the thickness of the waterproof sound-permeable membrane is 0.01 mm; the thickness of each adhesive layer is 0.01 mm; the thickness of the sealing foam layer is 0.67 mm; the thickness of the PET layer is 0.01 mm; 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 1.8 mm; the bandwidth t of the annular clearance area is 0.1 mm.

[0084] Several samples of Comparative Example 1 and the samples of the traditional sound-permeable membrane assembly in Comparative Example 2 were tested to measure the audio performance of different laminated assemblies under the same aperture. The test results are shown in Table 1.

[0085] Table 1

[0086]

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

[0088] Table 2

[0089]

[0090] The samples of Comparative Examples 7 - 8 were tested to measure the audio performance of assemblies with the same lamination under different foam thicknesses. The test results are shown in Table 3.

[0091] Table 3

[0092]

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

[0094] Table 4

[0095]

[0096] As can be seen from Table 1, three laminated structures were experimentally tested. Structures 1 and 2 are traditional 4-layer structures, while Structures 3 and 4 are 6-layer structures with an additional reinforcement layer. Structures 5 and 6 are also 6-layer structures, but their adhesive layers are thicker than those of Structures 3 and 4. The apertures of the openings in the laminates of all the above structures are the same. Through testing, it can be seen that for the laminate of the new 6-layer structure with an additional reinforcement layer (PET), when the compression rate is above 80% compared to Comparative Example 1, the audio performance is the same as that of Comparative Example 2 at a compression rate of 70%. Moreover, the slight change in the thickness of the adhesive layer has no effect on the experimental results, proving that the reinforcement layer has a good isolation effect on the deformation caused by compression, increasing the overall compression capacity of the component by more than 10%.

[0097] As can be seen from Samples 11 - 13 in Table 2, the waterproof and sound-permeable membrane components of the new 6-layer laminated structure were experimentally tested to examine the influence of the inner diameter of the openings in the first adhesive layer and the inner diameter of the openings from the second adhesive layer to the sealing foam layer on the audio. From the experimental results, it can be seen that for the laminated structure with an inner diameter of 1.6 mm for the openings in the first adhesive layer and an inner diameter of 2.0 mm for the openings from the second adhesive layer to the sealing foam layer, the highest compression rate is 10% higher than that of the laminated structure with an inner diameter of 1.6 mm for the openings in the first adhesive layer and an inner diameter of 1.8 mm for the openings from the second adhesive layer to the sealing foam layer. That is, the bandwidth t of the annular clearance area described in the present invention is at least above 0.1 mm. As can be seen from Samples 14 and 15 in Table 3, when the ratio of the thickness h of the sealing foam layer to the bandwidth t of the annular clearance area exceeds 6, it will greatly affect the foam compression rate and audio function. Therefore, the ratio of h:t = 1 - 6:1 is most suitable for the present invention. Further, from Table 4, it can be seen that when the same compression rate is applied to the membrane components, the present invention can maintain the audio within ±0.5 dB at both relatively small and relatively large compression rates. However, for Samples 4 and 6 of Comparative Example 1 and Sample 2 of Comparative Example 2, although the compression rate is increased, the audio performance will drop significantly, and even audio dispersion may occur. Therefore, the present invention can still maintain good audio performance at a relatively large compression rate.

[0098] In summary, through experiments, it can be concluded that by adding a reinforcement layer to the laminate and simultaneously setting up an annular clearance area, the audio performance of the waterproof and sound-permeable membrane component at a high compression rate can be greatly improved, that is, under a high compression state, the audio consistency of the product can still be maintained well.

[0099] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to 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 obvious to those skilled in the art, and the general principles defined herein can 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 rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A waterproof sound-permeable membrane assembly for a mobile phone microphone, characterized in that, The waterproof sound-permeable film assembly includes a first adhesive layer, a waterproof sound-permeable film, a second adhesive layer, a reinforcing layer, a third adhesive layer, and a sealing foam layer that are sequentially stacked 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; The inner diameters of the openings of the second adhesive layer, the reinforcing layer, the third adhesive layer, and the sealing foam layer are the same; The inner diameter of the opening of 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 clearance area, and the inner diameter difference between the two is X; The inner diameter of the openings of the second adhesive layer, the reinforcing layer, the third adhesive layer, and the sealing foam layer is d2, the inner diameter of the opening of the first adhesive layer is d1, the bandwidth of the annular clearance area is t, and d2 = d1 + 2t, X = 2t; d1 = 0.6 - 2.5 mm, t = 0.1 - 0.5 mm.

2. The waterproof sound-permeable membrane assembly for a mobile phone microphone according to claim 1, characterized in that, The openings on the second adhesive layer, the reinforcing layer, the third adhesive layer, and the sealing foam layer are coaxially arranged.

3. The waterproof sound-permeable film assembly for a mobile phone microphone according to claim 1, characterized in that, The openings on the first adhesive layer, the second adhesive layer, the reinforcing layer, the third adhesive layer, and the sealing foam layer are coaxially arranged.

4. The waterproof and sound-permeable membrane assembly for a mobile phone microphone according to claim 1, wherein, 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. The waterproof and sound-permeable membrane assembly for a mobile phone microphone according to claim 1, characterized in that, The d1 = 0.8 - 2.3 mm, t = 0.1 - 0.4 mm.

6. The waterproof sound-permeable membrane assembly for a mobile phone microphone according to claim 1, characterized in that, The d1 = 1.0 - 2.1 mm, t = 0.1 - 0.3 mm.

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

8. The waterproof sound-permeable film assembly for a mobile phone microphone according to claim 1, wherein, The waterproof sound-permeable film is a polyurethane film, and the thickness of the waterproof sound-permeable film is 0.002 - 0.1 mm.

9. The waterproof and sound-permeable membrane assembly for a mobile phone microphone according to claim 1, characterized in that, The thickness of the reinforcing layer is 0.01 - 0.15 mm.

10. A waterproof sound-permeable membrane assembly for a mobile phone microphone according to claim 1, characterized in that, The materials of the first adhesive layer, the second adhesive layer, and the third adhesive layer are pressure-sensitive adhesive or thermosensitive adhesive or waterproof foam adhesive or UV adhesive.

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