Waterproof sound transmission membrane assembly and electronic equipment

Abstract

The invention discloses a waterproof sound transmission membrane assembly, which solves the problem that the sound transmission performance of a waterproof sound transmission membrane becomes poor when an existing waterproof sound transmission membrane assembly is subjected to an assembly external force or other external forces, and comprises a waterproof sound transmission membrane which comprises a sound transmission area and an annular fixing area, the fixing area is located in the edge area of the waterproof sound-transmitting film. The supporting pieces are located on the two sides of the waterproof sound transmission film, and the supporting pieces are of an annular structure; the bonding piece is respectively bonded with the fixing area and the supporting piece; the bonding piece is of an annular structure; the deviation piece is located on the side, close to the external environment, of the waterproof sound transmission film; the offset piece is connected with the supporting piece; the offset piece is of an annular structure; under the action of an external force, a deviation effect exists between the deviation piece and the supporting piece; through the synergistic effect of the supporting piece and the deviation piece, it is guaranteed that the diaphragm does not have the problems of wrinkling and the like under the action of various external forces, the sound transmission performance is good all the time, the audio consistency is high, and the high-frequency-band acoustic resistance is small.

Description

Technical Field

[0001] The present invention relates to the technical field of membrane materials, and in particular to a waterproof and sound-permeable membrane component and electronic equipment. Background Art

[0002] Waterproof sound-permeable membrane is a waterproof material for acoustic components made of ultra-thin film. It is mainly used to protect the electroacoustic components of electronic devices such as mobile phones, tablets, game devices and electronic watches, such as speakers, receivers, speakers, MIC, etc., to prevent foreign objects such as water and dust from entering and affecting the sound generation and reception of electronic devices, thereby avoiding adverse effects on sound quality. It combines the two functions of waterproof and sound-permeable, which can ensure that sound can be transmitted through the membrane while maintaining waterproof performance, and the sound quality is basically unchanged.

[0003] At present, the waterproof sound-permeable membrane components on the market are usually of the structure of glue + membrane + glue (the membrane is a waterproof sound-permeable membrane, the glue on one side of the membrane is used to bond acoustic devices such as microphones, and the glue on the other side of the membrane is used to bond the shell). It has a simple structure, is easy to manufacture, and is widely used. However, in actual use, it is found that the waterproof sound-permeable membrane of the existing waterproof sound-permeable membrane components will have problems such as slight wrinkles and the diaphragm is not flat enough. In the field of sound transmission, especially deep water sound transmission, any slight change in the waterproof sound-permeable membrane will affect the sound transmission performance (especially in the case of high water pressure resistance). According to research, at low frequencies, the sound transmission of the waterproof sound-permeable membrane mainly depends on the membrane pore size and membrane porosity; while at mid- and high frequencies, especially high frequencies, it mainly relies on the vibration of the waterproof sound-permeable membrane itself for sound transmission. If the waterproof sound-permeable membrane has slight wrinkles, and the local area of ​​the membrane is convex or corrugated, it will affect the membrane pore size and cause uneven vibration in various areas at mid- and high frequencies. The vibration of the wrinkled part at mid- and high frequencies will lead to The sound loss is large, which has a great impact on the sound transmittance of the waterproof sound-permeable membrane, such as: 1. Poor audio consistency, that is, after the sound loss test of the waterproof sound-permeable membrane components of the same batch under the same Hz condition, the sound loss values ​​are relatively scattered, that is, the maximum sound loss value and the minimum sound loss value are quite different, which leads to uneven quality of the products in the same batch and low qualified rate; 2. The sound loss in the high-frequency band (greater than 1000 Hz, especially greater than 6000 Hz) is abnormal. The sound loss in the high-frequency area of ​​some products will be abnormally large, resulting in the waterproof sound-permeable membrane components being unable to transmit sound and thus unable to be used; the existence of the above problems makes the waterproof sound-permeable membrane components unable to meet the needs of actual applications, which greatly limits the application scope of the waterproof sound-permeable membrane. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a waterproof sound-permeable membrane assembly and an electronic device, which can effectively reduce the risk of wrinkles on the waterproof sound-permeable membrane and other factors affecting the flatness of the membrane, so as to improve the audio consistency of the waterproof sound-permeable membrane assembly and avoid abnormal sound loss in the high-frequency band.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a waterproof sound-permeable membrane assembly, comprising: A waterproof sound-permeable membrane, the waterproof sound-permeable membrane comprising a sound-permeable area for waterproofing and sound-permeability and an annular fixing area, the fixing area being located at an edge area of ​​the waterproof sound-permeable membrane; A support member, the support member is located on both sides of the waterproof sound-permeable membrane, and the support member is a ring-shaped structure; An adhesive member, one side of the adhesive member is bonded to the fixing area, and the other side of the adhesive member is bonded to the supporting member; the adhesive member is a ring-shaped structure; The offset piece is located on the side of the waterproof sound-permeable membrane close to the external environment; the offset piece is connected to the support piece; the offset piece is a ring structure; when an external force acts, there is an offset effect between the offset piece and the support piece.

[0006] The waterproof sound-permeable membrane assembly in the prior art needs to undergo various inspections and meet the set requirements before it is allowed to leave the factory. At the same time, a simulated client's press-fit assembly test is also set up before leaving the factory (that is, the waterproof sound-permeable membrane assembly is simulated to be assembled on the shell and subjected to a pressure test). However, after the waterproof sound-permeable membrane assembly is actually used by the client and assembled on the shell, it is found that the overall sound transmission performance of the waterproof sound-permeable membrane assembly is poor (mainly manifested in poor audio consistency, large sound loss in the high-frequency band, etc.). It is observed that this is mainly caused by the poor flatness of the waterproof sound-permeable membrane (for example, slight wrinkles appear on some sound-permeable diaphragms, bulges or corrugations in local areas). However, it is generally believed that the poor flatness of the waterproof sound-permeable membrane is caused by the die-cutting process when producing the waterproof sound-permeable membrane, or is affected by the use conditions after installation. After the researchers used the waterproof sound-permeable membrane assembly before, during and after press-fit assembly, the flatness of the membrane was poor. Through observations during the process, it was found that the poor flatness of the waterproof sound-permeable membrane was mainly caused by external forces during press-fit assembly and other external forces (such as water pressure) during use. This is because the shear strength between the glue and the membrane of the waterproof sound-permeable membrane assembly is weak, and the rigidity of the entire assembly is not strong enough. Therefore, when the waterproof sound-permeable membrane assembly is assembled on the housing of an electronic device, it is impossible to ensure that the external force of assembly is evenly applied to the waterproof sound-permeable membrane assembly, and it is impossible to ensure that the waterproof sound-permeable membrane assembly is subjected to other uniform external forces (such as water pressure) during use, that is, pressure perpendicular to the surface of the waterproof sound-permeable membrane. Therefore, a lateral shear force will be formed on the waterproof sound-permeable membrane, and this shear force will cause the waterproof sound-permeable membrane assembly to be under uneven pressure. Therefore, the waterproof sound-permeable membrane will undergo slight displacement changes under the action of external assembly force or water pressure, such as being stretched or slightly wrinkled, or even having bulges or ripples in local areas of the diaphragm.

[0007] In order to solve the above technical problems, R&D personnel generally make improvements by replacing the waterproof sound-permeable membrane (selecting waterproof sound-permeable membranes with different pore sizes, different materials, and different thicknesses) or replacing the glue (selecting glues with different bonding strengths, different materials, and different thicknesses). However, after use, it was found that the wrinkle problem still could not be avoided. The replacement of glue mainly increases the thickness of the glue to ensure that the glue and the waterproof sound-permeable membrane are firmly bonded, and the entire waterproof sound-permeable membrane assembly is tightly bonded to the shell. However, since the glue is soft, the greater its thickness, the weaker the shear strength between the glue and the membrane. Under the action of external force, the waterproof sound-permeable membrane is more likely to wrinkle and various sound permeability problems are more likely to occur.

[0008] On the one hand, in the present invention, support members are arranged on both sides of the waterproof sound-permeable membrane, and the support members are arranged corresponding to the fixed area of ​​the waterproof sound-permeable membrane (the fixed area is the area of ​​the waterproof sound-permeable membrane used to bond with the adhesive member). Since the support members are harder and more rigid than the waterproof sound-permeable membrane, the fixed area of ​​the waterproof sound-permeable membrane can be clamped by two support members (equivalent to clamping the edge area of ​​the waterproof sound-permeable membrane, and clamping it up and down), so that the two support members can flatten the waterproof sound-permeable membrane, thereby ensuring the flatness of the waterproof sound-permeable membrane, so that the waterproof sound-permeable membrane is not prone to slight wrinkles when subjected to certain external forces (especially shear forces, lateral shear forces), and it is even less likely to have bulges or ripples in local areas of the membrane.

[0009] In addition, the present invention further provides an offset member on the side of the waterproof sound-permeable membrane close to the external environment, and the offset member is connected to the support member. When an external force (assembly external force or other external force during use) acts, there is a certain offset effect between the offset member and the support member, that is, the offset member can have a certain slight movement (relative movement) relative to the support member, which can at least partially replace the offset of the adhesive member relative to the waterproof sound-permeable membrane (and then replace the deformation of the waterproof sound-permeable membrane), thereby reducing or preventing the adhesive member from offsetting relative to the waterproof sound-permeable membrane, thereby further reducing the possibility of slight wrinkles on the waterproof sound-permeable membrane affecting the flatness of the membrane when the waterproof sound-permeable membrane is subjected to external force.

[0010] At the same time, research has found that when the support and the offset parts exist at the same time, the possibility of offset between the waterproof sound-permeable membrane and the adhesive is greatly reduced, and the entire waterproof sound-permeable membrane assembly also has better sound transmission performance at high frequencies, thereby avoiding abnormal sound loss (also known as sound blocking) in the high-frequency band and excessive sound loss; and ensuring that the sound transmission of each waterproof sound-permeable membrane assembly in the batch is basically the same, thereby improving audio consistency.

[0011] As a further improvement of the present invention, the offset member is an adhesive member, the adhesive member is bonded to the support member, the ratio of the thickness of the offset member to the thickness of the adhesive member is 1.2-6; and the thickness of the offset member is not less than 0.02 mm.

[0012] With such a design, on the one hand, the offset piece can be fixed to the shell and the support piece by bonding (one side of the offset piece is bonded to the shell, and the other side is bonded to the support piece). Compared with other connection methods, the bonding and fixing method can facilitate the connection between the offset piece, the support piece and the shell, so as to reduce the difficulty of assembling the offset piece and the support piece, and the difficulty of assembling the waterproof sound-permeable membrane assembly and the shell; wherein the thickness of the offset piece is not less than 0.02mm, because if the offset piece is too thin, the offset piece cannot be offset relative to the support piece, and if the thickness of the offset piece is greater, it is easier to offset; therefore, setting the thickness of the offset piece to not less than 0.02mm can ensure that the offset piece can be offset; at the same time, when the offset piece is an adhesive piece, if the thickness of the offset piece is too small, it will also affect its bonding strength with the support piece and the shell, especially for metal shells. When the body is thick, a slightly thicker offset member may be needed; in addition, the present invention has found that when the ratio of the thickness of the offset member to the thickness of the adhesive member is set to 1.2-6 (the offset member is slightly thicker than the adhesive member), it can be ensured that when a certain external force is applied, the offset member and the support member are relatively more likely to be offset, and relatively, it is more difficult for the adhesive member and the waterproof sound-permeable membrane to be offset; in particular, when the offset member is an adhesive member of a certain thickness, the offset member and the support member can be more appropriately offset, further reducing the possibility of slight wrinkles in the waterproof sound-permeable membrane when subjected to a certain external force; and the presence of the offset member (adhesive member) and the adhesive member is conducive to ensuring that the support member clamps the waterproof sound-permeable membrane for a long time and plays a supporting role for a long time, further ensuring that the sound-permeable membrane assembly also has good sound transmission performance in the high frequency band, and at the same time, the sound loss consistency is good.

[0013] As a further improvement of the present invention, the adhesive member includes a first substrate layer and a first glue layer arranged along its thickness direction, two first glue layers are located on both sides of the first substrate layer, and the offset member is bonded to the support member through one of the first glue layers.

[0014] By setting the adhesive part as a double-sided tape structure rather than a structure fixed by glue and without a substrate layer, the first substrate layer can be used to increase the hardness of the adhesive part and prevent the adhesive part from being too soft, thereby preventing the offset part from being excessively or uncontrollably offset relative to the support part. The offset part can be bonded to the shell and the support part for a long time, thereby ensuring that the entire waterproof and sound-permeable membrane assembly can function as a waterproof and sound-permeable component for a long time.

[0015] As a further improvement of the present invention, the thickness of the support member is 0.8-5, preferably 1.2-3 of the thickness of the adhesive member; the thickness of the adhesive member is 0.01 mm -0.08 mm.

[0016] In the prior art, since there is no support, in order to ensure the bonding strength between the glue and the waterproof sound-permeable membrane, the researchers usually control the adhesive (glue) to be slightly thicker, so as to ensure that the adhesive and the sound-permeable membrane are firmly bonded, and the entire waterproof sound-permeable membrane assembly is tightly bonded to the shell; however, in the present invention, since a support is provided, in order to ensure that the overall thickness of the entire waterproof sound-permeable membrane assembly is not too high (if the thickness is too high, the entire waterproof sound-permeable membrane assembly cannot be installed on the shell), Therefore, it is necessary to set the thickness of the adhesive to be relatively thin. After research, the thickness of the adhesive is adjusted to 0.01mm-0.08mm. Such a design, on the one hand, makes the entire waterproof and sound-permeable membrane assembly have a suitable thickness, which is suitable for subsequent assembly processing and can meet customer needs. At the same time, the thickness of the adhesive will not be too small, ensuring sufficient bonding force, and the connection between the adhesive and the waterproof and sound-permeable membrane is very reliable; unexpectedly, due to the reduction in the thickness of the adhesive, we unexpectedly found that the probability of creep between the diaphragm and the adhesive has decreased. This is probably because the adhesive must be relatively soft. After the thickness of the adhesive is reduced, the shear strength between the adhesive and the waterproof and sound-permeable membrane will become stronger, thereby further reducing the possibility of wrinkles on the waterproof and sound-permeable membrane and affecting the flatness of the diaphragm; in addition, the present invention The thickness of the support member is set to 0.8-5 of the thickness of the adhesive member, preferably 1.2-3, because the greater the thickness of the adhesive member, the greater the possibility of deviation, so the support member needs to be harder and more rigid. Thickness is an important factor affecting the rigidity of the support member; at a suitable ratio, it can be ensured that the support member can stably clamp the waterproof sound-permeable membrane; that is, the thickness of the support member can be selected at will, but after further research, its thickness is also optimally controlled. For this reason, limiting the ratio of the thickness of the support member to the thickness of the adhesive member can make the thickness of the support member more reasonable. A support member of suitable thickness can not only play a suitable supporting role, but also has less impact on the overall thickness of the entire assembly.

[0017] As a further improvement of the present invention, the waterproof sound-permeable membrane assembly also includes an annular protective member, which is located on the side of the waterproof sound-permeable membrane away from the external environment, and is connected to the side of the support member away from the waterproof sound-permeable membrane. When external force acts, there is an offset between the protective member and the support member.

[0018] Through such a design, when the side of the waterproof sound-permeable membrane assembly away from the outside world is subjected to external force, the protective part can be offset relative to the supporting part, which can at least partially replace the offset between the adhesive and the waterproof sound-permeable membrane (replacing partial deformation of the waterproof sound-permeable membrane) to reduce or prevent the relative offset between the waterproof sound-permeable membrane and the adhesive, and further reduce the possibility of slight wrinkles on the waterproof sound-permeable membrane when subjected to external force. In addition, the study found that under low water pressure (for example, water pressure of 6 meters or less), the pressure of the acoustic device (especially the microphone board) on the waterproof sound-permeable membrane assembly is relatively small, and thus the displacement force (lateral shear force) it is subjected to is also relatively small. Only under the action of the displacement member can the double-layer support member structure (support member + glue + membrane + glue + support member) be guaranteed not to be deformed, so that the waterproof sound-permeable membrane is not wrinkled, thereby ensuring the consistency of audio performance and low high-frequency sound loss; while under high water pressure (for example, water pressure greater than 6 meters), especially under the water pressure of 50 meters and 100 meters used in watches, the pressure of the microphone board on the waterproof sound-permeable membrane assembly is relatively large, and thus the displacement force it is subjected to is also relatively large. At this time, the offset members and protective members on both sides of the double-layer support member structure are required to work together to ensure that the double-layer support member structure does not deform, thereby ensuring the consistency of audio performance and low high-frequency sound loss; that is to say, the addition of the protective member is more protective than having an offset member on only one side, so that the waterproof sound-permeable membrane assembly can withstand higher water pressure and has a wider range of applications.

[0019] As a further improvement of the present invention, the protective member is an adhesive member, the protective member is bonded to the supporting member, the thickness of the protective member is greater than the thickness of the adhesive member; and the ratio of the thickness of the protective member to the thickness of the offset member is 1:1.1-1:4.

[0020] Such a design allows the protective member to be fixed to the acoustic device and the support member by bonding. Compared with other connection methods, the bonding and fixing method can facilitate the connection between the protective member, the support member and the acoustic device, so as to reduce the difficulty of assembling the protective member and the support member, as well as the difficulty of assembling the waterproof sound-permeable membrane assembly and the acoustic device. The thickness of the protective member is greater than the thickness of the adhesive member, so that the fluidity of the adhesive member can be lower than the fluidity of the protective member, so that the shear strength between the adhesive member and the waterproof sound-permeable membrane can be greater than the shear strength between the protective member and the support member, thereby ensuring that when subjected to external force, it is more likely that the protective member and the support member will deviate, rather than the adhesive member and the waterproof sound-permeable membrane, thereby further avoiding The possibility of wrinkles on the waterproof sound-permeable membrane, especially when the protective part is an adhesive part of a certain thickness, can produce a suitable offset; and the ratio of the thickness of the protective part to the thickness of the offset part is 1:1.1-1:4. This design is because the protective part is subjected to relatively small pressing force from the microphone plate, so its bonding force requirement is relatively low and the required offset is small, while the offset part is subjected to greater external force and needs to ensure sufficient bonding force and offset. Therefore, the thickness of the offset part needs to be larger than that of the protective part (the offset part is relatively closer to the outside), but the ratio of the thickness between the two is not less than 0.25, so as to avoid excessive offset due to the offset part being too thick or the protective part being too thin and unable to offset.

[0021] As a further improvement of the present invention, the waterproof sound-permeable membrane has a thickness of 1-50 μm, a PMI average pore size of 0.05-10 μm, a porosity of 20%-80%, and a water pressure resistance of 1-1000 KPa.

[0022] With such a design, by selecting a waterproof and sound-permeable membrane of appropriate thickness, the rigidity of the waterproof and sound-permeable membrane can be ensured, and it can be avoided that the membrane is too thin to be difficult to process and prone to wrinkles, and it can be avoided that the membrane is too thick to increase the thickness of the entire component; then, through the reasonable selection of pore size and porosity, the waterproof and sound-permeable membrane can have a strong waterproof and sound-permeable effect, and the glue of the adhesive can penetrate into the waterproof and sound-permeable membrane in an appropriate amount; and the water pressure resistance setting can make the water pressure resistance of the waterproof and sound-permeable membrane at least 1 Kpa, thereby ensuring that the waterproof and sound-permeable membrane can still play a greater waterproof and sound-permeable role when subjected to greater pressure, and has a longer service life.

[0023] As a further improvement of the present invention, the support member is any one of PET, PE, PP, PI and stainless steel sheet; the hardness of the support member is not less than 15HV0.1, the thickness is 0.02-0.2mm, the gram weight is 0.03-0.3g / m2, and the surface energy is 20-50mN / m; preferably, the hardness of the support member is 20-90HV0.1.

[0024] With such a design, these materials are widely available, easy to obtain, and inexpensive. Then, through the reasonable selection of hardness (characterized by Vickers hardness in the present invention, 0.1" means the test force is 0.1kgf), thickness and weight, it is not only convenient for the processing of the support, but also can ensure that the support has sufficient rigidity and hardness to reduce the deformation capacity of the support, thereby avoiding the waterproof sound-permeable membrane from wrinkling due to bending and deformation after external force due to low rigidity and hardness; in addition, the surface energy of the support is limited to 20-50mN / m, which has a suitable surface energy to facilitate the bonding of the adhesive to the support while avoiding water infiltration, thereby reducing the amount of water infiltrating the waterproof sound-permeable membrane through the support, thereby improving the waterproof performance of the waterproof sound-permeable membrane assembly.

[0025] As a further improvement of the present invention, the adhesive comprises a second glue layer and a second substrate layer, the second glue layer is located on both sides of the second substrate layer, the second substrate layer is a PI or PET substrate, and the thickness of the second glue layer is 5-50 μm; the ratio of the thickness of the second glue layer to the thickness of the waterproof sound-permeable membrane is 0.8-2.

[0026] Since the second glue layer is soft, the thickness of the second glue layer needs to be reasonably controlled to ensure that there is sufficient bonding force between the adhesive and the waterproof sound-permeable membrane and it is not easy to separate, and to avoid the second glue layer being too thick, which makes it easier for the adhesive to shift relative to the supporting member. In addition, by controlling the thickness ratio between the second glue layer and the waterproof sound-permeable membrane within an appropriate range, the possibility of shifting between the adhesive and the waterproof sound-permeable membrane can be further reduced.

[0027] As a further improvement of the present invention, the present invention also provides an electronic device, including a housing, an acoustic device and a waterproof sound-permeable membrane assembly arranged inside the housing, the waterproof sound-permeable membrane assembly being the waterproof sound-permeable membrane assembly described in any of the above technical solutions, the housing being provided with an opening for transmitting sound to the external environment, the waterproof sound-permeable membrane assembly covering the opening to prevent water from entering the housing from the outside through the opening. Such a design can improve the acoustic performance of electronic equipment (mainly electronic equipment equipped with a microphone), have good sound permeability at all frequencies, have low sound loss, and have high audio consistency, thereby improving the user experience.

[0028] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the waterproof sound-permeable membrane assembly in Embodiment 1 of the present invention; Figure 2Schematic diagram of the structure of the adhesive member in the first embodiment of the present invention Figure 3 It is a schematic diagram of the structure of the offset member in the first embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the waterproof sound-permeable membrane assembly in the second embodiment of the present invention; Figure 5 A curve diagram of the sound loss test of the waterproof sound-permeable membrane assembly in the second embodiment of the present invention; Figure 6 A curve diagram of a sound loss test of a waterproof sound-permeable membrane assembly in the prior art; Figure 7 It is a simplified schematic diagram of an electronic device in Embodiment 3 of the present invention.

[0030] Reference numerals: 100. Waterproof sound-permeable membrane assembly; 110. Waterproof sound-permeable membrane; 111. Sound-permeable area; 112. Fixing area; 120. Support member; 130. Adhesive member; 131. Second substrate layer; 132. Second glue layer; 140. Deflection member; 141. First substrate layer; 142. First glue layer; 150. Protective member; 160. Foam; 200. Shell; 210. Opening; 300. Acoustic device. DETAILED DESCRIPTION

[0031] The technical solutions of the embodiments of the present invention are explained and illustrated below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of the present invention. In addition, it should be understood that the following words indicating orientation or position relationship such as "up", "down", "left", "right", "longitudinal", "lateral", "inside", "outside", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Embodiment 1

[0032] Reference Figures 1 to 3As shown, the waterproof sound-permeable membrane assembly 100 in this embodiment includes a waterproof sound-permeable membrane 110, a support member 120, an adhesive member 130 and an offset member 140, wherein the waterproof sound-permeable membrane 110 includes a sound-permeable area 111 for waterproofing and sound-permeability and an annular fixed area 112, the fixed area 112 is located at the edge area of ​​the waterproof sound-permeable membrane and surrounds the outside of the sound-permeable area 111; the support member 120 is located on both sides of the waterproof sound-permeable membrane 110, and the support member 120 is an annular structure; the adhesive member 130 is an annular structure, one side of the adhesive member 130 is bonded to the fixed area 112, and the other side is bonded to the support member 120; the offset member 140 is located on the side of the waterproof sound-permeable membrane 110 close to the external environment, the offset member 140 is an annular structure, and the offset member 140 is connected to the support member 120; when an external force acts, there is an offset effect between the offset member 140 and the support member 120.

[0033] In this embodiment, support members 120 are provided on both sides of the waterproof sound-permeable membrane 110, and the support members 120 are provided corresponding to the fixed area 112 of the waterproof sound-permeable membrane 110 (the fixed area 112 is the area of ​​the waterproof sound-permeable membrane 110 used to bond with the adhesive 130). Since the support members 120 are harder than the waterproof sound-permeable membrane 110, the rigidity is stronger. In this way, the fixed area 112 of the waterproof sound-permeable membrane 110 can be clamped by two support members 120 (equivalent to clamping the edge area of ​​the waterproof sound-permeable membrane 110, and clamping it up and down), so that the two support members 120 flatten the waterproof sound-permeable membrane 110, thereby ensuring the flatness of the waterproof sound-permeable membrane 110, so that the waterproof sound-permeable membrane 110 is not prone to slight wrinkles when subjected to certain external forces (especially shear forces, lateral shear forces), and it is even less likely that local areas of the membrane will bulge or have ripples.

[0034] In addition, the offset member 140 in this embodiment is connected to the support member 120. When an external force (assembly external force or other external force during use) acts, there is a certain offset effect between the offset member 140 and the support member 120, that is, the offset member 140 can have a certain slight movement (relative movement) relative to the support member 120, which can at least partially replace the offset of the adhesive 130 relative to the waterproof sound-permeable membrane 110 (and then replace the deformation of the waterproof sound-permeable membrane 110), thereby reducing or preventing the adhesive 130 from offsetting relative to the waterproof sound-permeable membrane 110, thereby further reducing the possibility of slight wrinkles on the waterproof sound-permeable membrane 110 affecting the flatness of the membrane when the waterproof sound-permeable membrane 110 is subjected to external force.

[0035] At the same time, it was found through research that when the support member 120 and the offset member 140 exist at the same time, the possibility of offset between the waterproof sound-permeable membrane 110 and the adhesive member 130 is greatly reduced, and the entire waterproof sound-permeable membrane assembly 100 also has better sound transmission performance at high frequencies, thereby avoiding abnormal sound loss (also known as sound blocking amount) in the high-frequency band and excessive sound loss; and the sound transmission of each waterproof sound-permeable membrane assembly 100 in the batch is basically the same, thereby improving the audio consistency.

[0036] The test method for sound blocking (sound loss) is: 1. Place the sample to be tested on an audio test board with a sound hole of 1mm diameter and 0.8mm depth. Knowles SPA1687LR5H is the preferred analog microphone. 2. Set up an artificial mouth 2 cm away from the microphone fixture. Both the simulated microphone and the artificial mouth are connected to an audio analyzer (such as the Audio Precision x525 model); 3. Use the audio testing software provided by Audio Preciseion to make the artificial mouth emit a sound with a frequency of 100Hz-10000Hz and a sound pressure level of 94dBSPL; 4. Collect and subtract the response signals of the microphone end when the test component is mounted on the surface of the audio test board and when the test component is not mounted on the surface of the audio test board, and finally obtain the sound blocking amount (sound loss) of the corresponding object. Perform the above test several times (at least 10 times) and then take the average value; Those skilled in the art will appreciate that, in addition to the above method, other suitable measurement methods may be used to obtain the parameter, and the measurement methods listed here are for reference only (for example, based on the acoustic impedance and transmission loss test specification ASTME2611 / IEC 60268-16).

[0037] Specifically, the waterproof sound-permeable membrane 110 in this embodiment is any one of nylon membrane, polyethylene membrane, polypropylene membrane, polytetrafluoroethylene membrane and polyimide membrane. These materials are very common, easy to obtain, and inexpensive. The thickness of the waterproof sound-permeable membrane 110 is 1-50μm, the average pore size of PMI is 0.05-10μm, the porosity is 20%-80%, and the water pressure resistance is 1-1000KPa. In this design, by selecting a waterproof sound-permeable membrane 110 of appropriate thickness, the rigidity of the waterproof sound-permeable membrane 110 can be ensured, and it can be avoided that it is too thin and difficult to process and easy to wrinkle, and it can be avoided that it is too thick and increases the thickness of the entire component; then, through the reasonable selection of pore size and porosity, the waterproof sound-permeable membrane 110 can have a strong waterproof and sound-permeable effect, and the glue of the adhesive 130 can penetrate into the waterproof sound-permeable membrane 110 in an appropriate amount. The water pressure resistance setting can make the water pressure resistance of the waterproof and sound-permeable membrane at least 1 Kpa, thereby ensuring that when subjected to greater pressure, the waterproof and sound-permeable membrane 110 can still play a greater waterproof and sound-permeable role and has a longer service life.

[0038] The support member 120 is any one of PET, PE, PP, PI and stainless steel sheet, which are widely available, easy to obtain, and inexpensive.

[0039] The hardness of the support member 120 is not less than 15HV0.1. Preferably, the hardness of the support member is 20-90HV0.1. The thickness of the support member 120 is 0.02-0.2mm, and the weight is 0.03-0.3g / m 2 , the surface energy is 20-50mN / m. Such a design, through the reasonable selection of hardness, thickness and gram weight, can not only facilitate the processing of the support member 120, but also ensure that the support member 120 has sufficient rigidity and hardness to reduce the deformation ability of the support member 120, thereby avoiding the waterproof sound-permeable membrane 110 from wrinkling due to bending and deformation after being subjected to external force due to low rigidity and hardness; in addition, limiting the surface energy of the support member 120 to 20-50mN / m can also make the surface of the support member 120 have appropriate hydrophobicity and hydrophilicity, so as to facilitate the bonding of the adhesive 130 to the support member 120 while avoiding water infiltration, thereby reducing the amount of water infiltrating the waterproof sound-permeable membrane 110 through the support member 120, thereby improving the waterproof performance of the waterproof sound-permeable membrane assembly 100.

[0040] In addition, the adhesive member 130 in this embodiment is a double-sided adhesive structure such as a heat-sensitive adhesive, a pressure-sensitive adhesive, or a photosensitive adhesive, which includes a second substrate layer 131 and a second glue layer 132. The second glue layer 132 is located on both sides of the second substrate layer 131. The second substrate layer 131 is a PI or PET substrate, and the thickness of the second glue layer 132 is 5-50 μm; since the second glue layer 132 is soft, it is necessary to reasonably control the thickness of the second glue layer 132, which can ensure that there is sufficient adhesion between the adhesive member 130 and the waterproof sound-permeable membrane 110 and it is not easy to separate, and avoid the second glue layer 132 being too thick, causing the adhesive member 130 to be more easily offset relative to the support member 120; in addition, by controlling the ratio of the thickness of the second glue layer 132 to the thickness of the waterproof sound-permeable membrane 110 within the range of 0.8 to 2, the possibility of offset between the adhesive member 130 and the waterproof sound-permeable membrane 110 can be further reduced.

[0041] Secondly, the offset member 140 in the present embodiment is an adhesive member, which is bonded to the support member 120. With such a design, on the one hand, the offset member 140 can be fixed to the housing and the support member 120 of the electronic device in an adhesive manner (one side of the offset member 140 is bonded to the housing, and the other side is bonded to the support member 120). Compared with other connection methods, the adhesive fixing method can facilitate the connection between the offset member 140, the support member 120 and the housing, so as to reduce the difficulty of assembling the offset member 140 and the support member 120, as well as the difficulty of assembling the waterproof sound-permeable membrane assembly 100 and the housing. In addition, in the present embodiment, the thickness of the offset member 140 is not less than 0.02 mm. This is because the thickness of the offset member 140 is too thin when it is less than 0.02 mm, resulting in the offset member 140 being unable to be offset relative to the support member 120. If the thickness of the offset member 140 is larger, it is easier to offset. Therefore, setting the thickness of the offset member 140 to be not less than 0.02 mm can ensure that the offset member 140 can be offset. At the same time, when the offset member 140 When the offset member 140 is an adhesive member, if the thickness of the offset member 140 is too small, it will also affect the bonding strength between the offset member 140 and the support member 120 and the shell. In particular, when the shell is a metal shell, a slightly thicker offset member 140 may be required. In addition, in this embodiment, it is found that when the ratio of the thickness of the offset member 140 to the thickness of the adhesive member 130 is set to 1.2-6 (the offset member 140 is slightly thicker than the adhesive member 130), it can be ensured that when a certain external force is applied, the offset member 140 and the support member 120 are relatively more likely to deviate. If the adhesive 130 and the offset member 140 (adhesive member) are offset, then it is relatively more difficult for the adhesive member 130 and the waterproof sound-permeable membrane 110 to be offset; in particular, if the offset member 140 is an adhesive member of a certain thickness, the offset member 140 and the support member 120 can be offset appropriately, further reducing the possibility of slight wrinkles on the waterproof sound-permeable membrane 110 when subjected to a certain external force; and the presence of the adhesive 130 and the offset member 140 (adhesive member) is conducive to ensuring that the support member 120 clamps the waterproof sound-permeable membrane 110 for a long time, thereby playing a supporting role for a long time.

[0042] Preferably, Figure 3 As shown, the offset member 140 in this embodiment can be a double-sided adhesive such as a heat-sensitive adhesive, a pressure-sensitive adhesive, or a photosensitive adhesive, which includes a first substrate layer 141 and a first glue layer 142 arranged along its thickness direction, and the two first glue layers 142 are located on both sides of the first substrate layer 141. The first substrate layer 141 is a PI or PET substrate, and the offset member 140 is bonded to the support member 120 on the side close to the external environment through one of the first glue layers 142. By setting the adhesive member as a double-sided adhesive structure rather than a structure fixed by glue liquid and without a substrate layer, the first substrate layer 141 can be used to increase the hardness of the adhesive member to avoid the adhesive member being too soft, thereby avoiding excessive or uncontrollable offset of the offset member 140 relative to the support member 120, and the offset member 140 can be bonded to the housing and the support member 120 for a long time, thereby ensuring that the entire waterproof and sound-permeable membrane assembly 100 plays a waterproof and sound-permeable role for a long time.

[0043] Preferably, in this embodiment, the thickness of the support member 120 is 0.8-5 of the thickness of the adhesive member 130, preferably 1.2-3; the thickness of the adhesive member 130 is 0.01 mm -0.08 mm. In the prior art, since there is no support member 120, in order to ensure the bonding strength between the glue and the waterproof sound-permeable membrane, R&D personnel usually control the adhesive member (glue) to be slightly thicker, thereby ensuring a firm bond between the adhesive member and the waterproof sound-permeable membrane, and a tight bond between the entire waterproof sound-permeable membrane assembly and the shell; but in this embodiment, since the support member 120 is provided, in order to ensure that the overall thickness of the entire waterproof sound-permeable membrane assembly is not too high (if the thickness is too high, the entire waterproof sound-permeable membrane assembly cannot be installed on the shell), it is necessary to set the thickness of the adhesive member 130 to be relatively thin. After research, the thickness of the adhesive member 130 is adjusted to 0.01 mm -0.08mm. Such a design, on the one hand, makes the entire waterproof and sound-permeable membrane assembly have a suitable thickness, which is suitable for subsequent assembly processing and can meet customer needs. At the same time, the thickness of the adhesive 130 will not be too small, ensuring sufficient bonding force, and the connection between the adhesive 130 and the waterproof and sound-permeable membrane 110 is very reliable; unexpectedly, due to the reduction in the thickness of the adhesive 130, we unexpectedly found that the probability of creep between the waterproof and sound-permeable membrane 110 and the adhesive 130 has decreased. This is probably because the adhesive 130 must be relatively soft. After the thickness of the adhesive 130 is reduced, the shear strength between the adhesive 130 and the waterproof and sound-permeable membrane 110 will become stronger, thereby further reducing the possibility of wrinkles on the waterproof and sound-permeable membrane 110 and other factors that affect the flatness of the diaphragm; it can also ensure sufficient bonding force of the adhesive 130 to improve the adhesion between the adhesive 130 and the waterproof The connection reliability of the water-permeable sound-permeable membrane 110; in addition, in this embodiment, the thickness of the support member 120 is set to 0.8-5 of the thickness of the adhesive member 130, preferably 1.2-3, because the greater the thickness of the adhesive member 130, the greater the possibility of deviation, so the support member 120 needs to be harder and more rigid, and the thickness is an important factor affecting the rigidity of the support member 120; under a suitable ratio, it can be ensured that the support member 120 stably clamps the waterproof sound-permeable membrane 110; that is, the thickness of the support member 120 can be selected at will, but after further research, its thickness is also optimally controlled. For this reason, limiting the ratio of the thickness of the support member 120 to the thickness of the adhesive member 130 can make the thickness of the support member 120 more reasonable, and the support member 120 of suitable thickness can not only play a suitable supporting role, but also has less impact on the overall thickness of the entire assembly.

[0044] It should be noted that under low water pressure (for example, water pressure of 6 meters or less), the waterproof sound-permeable membrane assembly 100 in this embodiment is subjected to relatively small pressing force from acoustic devices (especially the microphone board), and thus the offset force (lateral shear force) it is subjected to is also relatively small. Only under the action of the offset member 140 can the double-layer support member structure (support member 120 + glue + membrane + glue + support member 120) be ensured not to be deformed, so that the waterproof sound-permeable membrane 110 is not wrinkled, thereby ensuring consistency of audio performance and low high-frequency sound loss. Embodiment 2

[0045] like Figure 4 As shown, different from the first embodiment, the waterproof sound-permeable membrane assembly 100 in this embodiment also includes an annular protective member 150, which is located on the side of the waterproof sound-permeable membrane 110 away from the external environment, and the protective member 150 is connected to the side of the support member 120 away from the waterproof sound-permeable membrane 110. When an external force acts, there is an offset between the protective member 150 and the support member 120.

[0046] This is because under the action of high water pressure (for example, greater than 6 meters water pressure), especially under the 50-meter and 100-meter water pressure used in watches, the waterproof sound-permeable membrane assembly 100 is subjected to a relatively large pressing force from the microphone plate, and thus is subjected to a relatively large displacement force. This will cause the inner adhesive 130 to be offset relative to the waterproof sound-permeable membrane 110, thereby causing the waterproof sound-permeable membrane 110 to wrinkle. That is, under high water pressure scenarios, the waterproof sound-permeable membrane assembly 100 in Example 1 has poor sound transmission performance, poor audio consistency, and large high-frequency sound loss.

[0047] In order to solve the above technical problems, in this embodiment, by adding a protective member 150, when the side of the waterproof sound-permeable membrane assembly 100 away from the outside world is subjected to external force, the protective member 150 can be offset relative to the support member 120, which can at least partially replace the offset between the adhesive member 130 and the waterproof sound-permeable membrane 110 (replacing partial deformation of the waterproof sound-permeable membrane 110), so as to reduce or prevent the relative offset between the waterproof sound-permeable membrane 110 and the adhesive member 130, and further reduce the possibility of slight wrinkles of the waterproof sound-permeable membrane 110 when subjected to external force, that is, under high water pressure (for example, greater than 6 meters water pressure), especially for watches with 5 Under water pressure of 0 meters and 100 meters, the waterproof sound-permeable membrane assembly 100 is subjected to a relatively large microphone plate pressing force, and thus is subjected to a relatively large offset force. At this time, the offset members 140 and the protective members 150 on both sides of the double-layer support member 120 structure need to work together to ensure that the double-layer support member 120 structure does not deform, thereby ensuring the consistency of the audio performance and low high-frequency sound loss. In other words, the addition of the protective member 150 has a stronger protective effect than having the offset member 140 on only one side, so that the waterproof sound-permeable membrane assembly 100 can withstand higher water pressure, thereby increasing the diversity of the use environment of the waterproof sound-permeable membrane assembly 100 and extending its application range.

[0048] The protective member 150 in this embodiment is an adhesive member, and the protective member 150 is bonded to the support member 120. Such a design allows the protective member 150 to be fixed to the acoustic device and the support member 120 in an adhesive manner. Compared with other connection methods, the adhesive fixing method can facilitate the connection between the protective member 150, the support member 120 and the acoustic device, so as to reduce the difficulty of assembling the protective member 150 and the support member 120, and the difficulty of assembling the waterproof sound-permeable membrane assembly 100 and the acoustic device; and the thickness of the protective member 150 is greater than the thickness of the adhesive member 130, so that the fluidity of the adhesive member 130 can be lower than the fluidity of the protective member 150, so that the shear strength between the adhesive member 130 and the waterproof sound-permeable membrane 110 can be greater than the shear strength between the protective member 150 and the support member 120, thereby ensuring that the protective member 150 and the support member 120 are more likely to deviate when subjected to external force, while the adhesive member 130 0 and the waterproof sound-permeable membrane 110 are more difficult to deviate, thereby further avoiding the possibility of wrinkles in the waterproof sound-permeable membrane 110, especially when the protective member 150 is an adhesive member of a certain thickness, which can more appropriately deviate; finally, the ratio of the thickness of the protective member 150 to the thickness of the offset member 140 is limited to 1:1.1-1:4. This design is because the pressing force of the microphone plate on the protective member 150 is relatively small, so its bonding force requirement is relatively low and the amount of deflection required is small, while the offset member 140 is subject to a large external force and needs to ensure sufficient bonding force and deflection. Therefore, the thickness of the offset member 140 needs to be larger than that of the protective member 150 (the offset member 140 is relatively closer to the outside), but the thickness ratio between the two is not less than 0.25, so as to avoid excessive deflection caused by the offset member 140 being too thick or the protective member 150 being too thin and unable to deflect.

[0049] It is understandable that in other embodiments of the present invention, the offset member may also be a glue layer formed by curing the glue. Comparative Example 1

[0050] The waterproof sound-permeable membrane assembly 100 of the present embodiment includes a waterproof sound-permeable membrane 110, a support member 120 and an adhesive member 130, wherein the waterproof sound-permeable membrane 110 includes a sound-permeable area 111 for waterproofing and sound-permeability and an annular fixed area 112, wherein the fixed area 112 is located at the edge area of ​​the waterproof sound-permeable membrane and surrounds the outside of the sound-permeable area 111; the support member 120 is located on both sides of the waterproof sound-permeable membrane 110, and the support member 120 is an annular structure; the adhesive member 130 is an annular structure, one side of the adhesive member 130 is bonded to the fixed area 112, and the other side is bonded to the support member 120. The specific structures and related parameters of the waterproof sound-permeable membrane 110, the support member 120 and the adhesive member 130 can be set with reference to the first embodiment and will not be described in detail here. Comparative Example 2

[0051] The waterproof sound-permeable membrane assembly of the present embodiment includes a waterproof sound-permeable membrane 110, a support member 120 and an adhesive member 130, wherein the waterproof sound-permeable membrane 110 includes a sound-permeable area 111 for waterproofing and sound-permeability and an annular fixed area 112, wherein the fixed area 112 is located at the edge area of ​​the waterproof sound-permeable membrane and surrounds the outside of the sound-permeable area 111; the support member 120 is located on the side of the waterproof sound-permeable membrane 110 close to the external environment, and the support member 120 is an annular structure; the adhesive member 130 is an annular structure, one side of the adhesive member 130 close to the external environment is bonded to the fixed area 112, and the other side is bonded to the support member 120, and one side of another adhesive member 130 is bonded to the fixed area 112, and the other side is bonded to the acoustic device. The specific structures and related parameters of the waterproof sound-permeable membrane 110, the support member 120 and the adhesive member 130 can be referred to the settings of Example 1 and will not be described in detail here. Comparative Example 3

[0052] The waterproof sound-permeable membrane assembly of the present embodiment includes a waterproof sound-permeable membrane 110, a support member 120 and an adhesive member 130, wherein the waterproof sound-permeable membrane 110 includes a sound-permeable area 111 for waterproofing and sound-permeability and an annular fixed area 112, wherein the fixed area 112 is located at the edge area of ​​the waterproof sound-permeable membrane and surrounds the outside of the sound-permeable area 111; the support member 120 is located on the side of the waterproof sound-permeable membrane 110 that is away from the external environment, and the support member 120 is an annular structure; the adhesive member 130 is an annular structure, one side of the adhesive member 130 on the side away from the external environment is bonded to the fixed area 112, and the other side is bonded to the support member 120, another adhesive member 130 has one side bonded to the fixed area 112, and the other side is bonded to the housing of the electronic device, the specific structures and related parameters of the waterproof sound-permeable membrane 110, the support member 120 and the adhesive member 130 can be referred to the settings of Example 1, and will not be described in detail here. Comparative Example 4

[0053] The waterproof sound-permeable membrane assembly of the present embodiment includes a waterproof sound-permeable membrane 110 and an adhesive 130, wherein the waterproof sound-permeable membrane 110 includes a sound-permeable area 111 for waterproof and sound-permeable and an annular fixed area 112, wherein the fixed area 112 is located in the edge area of ​​the waterproof sound-permeable membrane and surrounds the outside of the sound-permeable area 111; the adhesive 130 is an annular structure, and the adhesive 130 is arranged on both sides of the waterproof sound-permeable membrane 110, wherein one side of the adhesive 130 close to the external environment is bonded to the fixed area 112, and the other side is bonded to the shell of the electronic device, and one side of another adhesive 130 is bonded to the fixed area 112, and the other side is bonded to the acoustic device in the electronic device. The specific structure and related parameters of the waterproof sound-permeable membrane 110 and the specific structure of the adhesive 130 can be set with reference to the first embodiment, and will not be described in detail here, but the thickness of the adhesive 130 is greater than the thickness of the adhesive 130 in the first embodiment to ensure the bonding tightness between the adhesive 130 and the waterproof sound-permeable membrane 110, the shell and the acoustic component.

[0054] When the waterproof sound-permeable membrane 110 is a PTFE sound-permeable membrane that can withstand a water pressure of 2 m (the thickness of the waterproof sound-permeable membrane 110 is 10 μm, and the air permeability is 4 s@0.1 in² / 100 ml), the performance tests of the waterproof sound-permeable membranes 110 of the above-mentioned embodiments 1 and 2, and comparative examples 1 to 4 are respectively carried out, and the test results are shown in the following table: Test Case Sound loss at 1000HZ Sound loss at 5000HZ Sound loss at 6000HZ Sound loss at 9000HZ Embodiment 1 1dB 0.8dB 0.6dB 0.2dB Embodiment 2 1dB 0.7dB 0.4dB 0.1dB Comparative Example 1 1.2dB 1.5dB 2.2dB 4dB Comparative Example 2 1.3dB 1.9dB 2.7dB 4.8dB Comparative Example 3 1.4dB 2dB 2.8dB 5dB Comparative Example 4 1.5dB 2.2dB 3dB 5.5dB As can be seen from the above table, by comparing Example 1 with Comparative Examples 1 to 4, under the synergistic effect of the double-sided support member 120 and the offset member 140, the flatness of the waterproof sound-permeable membrane 110 is ensured, so that when the waterproof sound-permeable membrane 110 is subjected to a certain external force (especially shear force, lateral shear force), it is not easy to have slight wrinkles, and it is even less likely to have a local area of ​​the waterproof sound-permeable membrane 110 bulge or ripples, and the sound loss at high frequencies is very small; at the same time, the sound loss of each product is basically the same (Example 1 is similar to Example 1 Figure 5 As mentioned above, the audio consistency is good; while in Comparative Examples 1 to 4, even in the same batch, the sound loss of different products is very different and very scattered (Comparative Example 4 is similar Figure 6 As described above); and since the diaphragm is a shallow water diaphragm, the performances of the samples obtained in Example 1 and Example 2 are basically the same.

[0055] When the waterproof sound-permeable membrane 110 is a PTFE sound-permeable membrane that can withstand a water pressure of 10 m (the thickness of the waterproof sound-permeable membrane 110 is 10 μm, and the air permeability is 5-7 s@1 in² / 100 ml), the performance tests of the waterproof sound-permeable membranes 110 of the above-mentioned embodiments 1 and 2, and comparative examples 1 to 4 are respectively carried out, and the test results are shown in the following table: Test Case Sound loss at 1000HZ (unit: dB) Sound loss at 5000HZ (unit: dB) Sound loss at 6000HZ (unit: dB) Sound loss at 9000HZ (unit: dB) Embodiment 1 2 1.5 1 0.6 Embodiment 2 1.9 1.3 0.6 0.2 Comparative Example 1 2.5 3.3 4.0 5.4 Comparative Example 2 2.8 3.6 4.5 6.0 Comparative Example 3 2.9 3.8 4.7 6.2 Comparative Example 4 3 4 5 6.5 It can be seen from the above table that under high water pressure, the joint action of the offset member 140 and the protective member 150 can ensure that the double-layer support member structure is basically not deformed, thereby ensuring the consistency of audio performance and the high-frequency sound loss is still low (Example 2 has also made significant progress compared to Example 1); that is to say, after adding the protective member 150, compared with only having the offset member 140 on one side, it has a better protective effect, so that the waterproof and sound-permeable membrane assembly can withstand higher water pressure and has a wider range of applications. Embodiment 3

[0056] like Figure 4 and Figure 7As shown, this embodiment also provides an electronic device, including a housing 200, an acoustic device 300 and a waterproof sound-permeable membrane assembly 100 disposed inside the housing 200, the waterproof sound-permeable membrane assembly 100 is the waterproof sound-permeable membrane assembly 100 described in Example 2, the acoustic device 300 is a microphone or a speaker, etc., the housing 200 is provided with an opening 210 for transmitting sound to the external environment, and the waterproof sound-permeable membrane assembly 100 is bonded to the inner side of the housing 200 through an offset member 140 and covers the opening 210 to prevent water from entering the housing 200 from the outside through the opening 210. Such a design can improve the acoustic performance of the electronic device (mainly an electronic device equipped with a microphone), have good sound permeability at all frequencies, have low sound loss, and have high audio consistency, thereby improving the user experience.

[0057] In order to further ensure the sealing of the acoustic device 300 inside the shell 200 (if the sealing is poor, it will have a great impact on sound propagation and is prone to sound leakage), the waterproof sound-permeable membrane assembly 100 in this embodiment also includes foam 160, and the protective member 150 is bonded and fixed to the foam 160. During assembly, the foam 160 is fixed to the acoustic device 300 by bonding or screws or snaps, so that the sealing between the protective member 150 and the acoustic device 300 is achieved through the foam 160, thereby ensuring high-quality sound transmission. During the transmission process, the sound loss is very small, thereby meeting the needs of practical applications; in addition, since the foam 160 is relatively soft and has a certain elasticity, it can not only adapt to the assembly gap between the protective member 150 and the acoustic device 300 through its own deformation to reduce the difficulty of assembly and processing accuracy requirements, but also increase the distance between the waterproof sound-permeable membrane 110 and the acoustic device 300 to avoid the acoustic device 300 being squeezed and causing the waterproof sound-permeable membrane 110 to rupture, thereby extending the service life of the waterproof sound-permeable membrane assembly 100.

[0058] It is understandable that in other embodiments of the present invention, in order to simplify the structure of the waterproof and sound-permeable membrane assembly, the protective member may also be directly bonded and fixed to the acoustic device to achieve sealing.

[0059] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A waterproof sound-permeable membrane assembly, characterized in that: include: A waterproof sound-permeable membrane, the waterproof sound-permeable membrane comprising a sound-permeable area for waterproofing and sound-permeability and an annular fixing area, the fixing area being located at an edge area of ​​the waterproof sound-permeable membrane; A support member, the support member is located on both sides of the waterproof sound-permeable membrane, and the support member is a ring-shaped structure; An adhesive member, wherein one side of the adhesive member is bonded to the fixing area, and the other side of the adhesive member is bonded to the supporting member; The adhesive member is a ring-shaped structure; The offset piece is located on the side of the waterproof sound-permeable membrane close to the external environment; the offset piece is connected to the support piece; the offset piece is a ring structure; when an external force acts, there is an offset effect between the offset piece and the support piece.

2. A waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The offset member is an adhesive member, the adhesive member is bonded to the support member, the ratio of the thickness of the offset member to the thickness of the adhesive member is 1.2-6; and the thickness of the offset member is not less than 0.02 mm.

3. A waterproof sound-permeable membrane assembly as claimed in claim 2, characterized in that: The adhesive component comprises a first substrate layer and a first glue layer arranged along the thickness direction thereof, two first glue layers are located on both sides of the first substrate layer, and the offset component is bonded to the support component through one of the first glue layers.

4. A waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The thickness of the support member is 0.8-5 of the thickness of the adhesive member, preferably 1.2-3; the thickness of the adhesive member is 0.01mm-0.08mm.

5. A waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The waterproof sound-permeable membrane assembly also includes an annular protective member, which is located on the side of the waterproof sound-permeable membrane away from the external environment, and is connected to the side of the support member away from the waterproof sound-permeable membrane. When an external force acts, there is an offset between the protective member and the support member.

6. A waterproof sound-permeable membrane assembly as claimed in claim 5, characterized in that: The protective member is an adhesive member, the protective member is bonded to the supporting member, the thickness of the protective member is greater than the thickness of the adhesive member; and the ratio of the thickness of the protective member to the thickness of the offset member is 1:1.1-1:

4.

7. A waterproof sound-permeable membrane assembly according to any one of claims 1 to 6, characterized in that: The waterproof and sound-permeable membrane has a thickness of 1-50 μm, a PMI average pore size of 0.05-10 μm, a porosity of 20%-80%, and a water pressure resistance of 1-1000 KPa.

8. A waterproof sound-permeable membrane assembly according to any one of claims 1 to 6, characterized in that: The support member is any one of PET, PE, PP, PI and stainless steel sheet; the hardness of the support member is not less than 15HV0.1, the thickness is 0.02-0.2mm, and the weight is 0.03-0.3g / m 2 , the surface energy is 20-50mN / m; preferably, the hardness of the support member is 20-90HV0.

1.

9. A waterproof sound-permeable membrane assembly according to any one of claims 1 to 6, characterized in that: The adhesive comprises a second glue layer and a second substrate layer, wherein the second glue layer is located on both sides of the second substrate layer, the second substrate layer is a PI or PET substrate, and the thickness of the second glue layer is 5-50 μm; the ratio of the thickness of the second glue layer to the thickness of the waterproof sound-permeable membrane is 0.8-2.

10. An electronic device, comprising a housing, an acoustic device and a waterproof sound-permeable membrane assembly arranged inside the housing, characterized in that: The waterproof sound-permeable membrane assembly is the waterproof sound-permeable membrane assembly according to any one of claims 1 to 9, the shell is provided with an opening for transmitting sound to the external environment, and the waterproof sound-permeable membrane assembly covers the opening to prevent water from entering the shell from the outside through the opening.

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