A waterproof sound-permeable membrane assembly and electronic device having the same

Abstract

The present invention provides a waterproof sound-permeable membrane assembly and an electronic device with the waterproof sound-permeable membrane assembly, the waterproof sound-permeable membrane assembly comprises a waterproof sound-permeable membrane, a first support plate and an annular side portion, the first support plate is provided with a plurality of first sound-permeable holes; the annular side portion is arranged on the outer edge of the first support plate and forms an installation cavity, the waterproof sound-permeable membrane is fixed in the installation cavity by a first annular adhesive layer; a first gap for the waterproof sound-permeable membrane to vibrate freely is arranged between the first support plate and the waterproof sound-permeable membrane; the elastic modulus of the first support plate is 50-500MPa; the sound barrier amount of the waterproof sound-permeable membrane assembly in the audio frequency range of 100-10000Hz is not more than 6dB, and the sound transmission performance is excellent; the water pressure resistance of the waterproof sound-permeable membrane assembly is at least 0.5MPa; the waterproof sound-permeable membrane assembly can withstand the influence of the pressure of 0.5MPa, play the role of waterproof and sound-permeable for a long time, thereby ensuring the normal application of the electronic device; and the waterproof sound-permeable membrane is not easily compressed, the membrane vibration will not be affected, and the audio performance will not be discrete.

Description

Technical Field

[0001] The present invention relates to the technical field of membrane materials, and more particularly to a waterproof and sound-permeable membrane assembly and an electronic device having the waterproof and sound-permeable membrane assembly. Background Art

[0002] In recent years, electronic devices such as mobile phones, tablet computers, game devices and electronic watches generally have sound functions. In the housing of electronic devices with sound functions, sound receiving parts such as microphones are accommodated as sound parts; openings are usually provided in the housing of the electronic device at positions corresponding to these sound parts, and sound is transmitted between the outside of the electronic device and the sound parts through the openings. Waterproof sound-permeable membrane is a new type of waterproof and breathable material. It uses sound-permeable materials to minimize sound loss during sound transmission; the current processes for preparing waterproof sound-permeable membranes are mainly the following: 1. Casting compound; 2. Spraying or scraping compound; 3. Hot pressing compound, etc. Waterproof sound-permeable membranes are generally installed on the ports of electronic devices as a barrier to prevent water or other liquids from entering, and at the same time will not cause a significant decrease in the transmission, integrity or quality of sound; this greatly ensures the normal use of electronic devices and extends the service life of electronic devices.

[0003] Existing waterproof and sound-permeable membranes generally have good waterproof and sound-permeable performance, but when subjected to a large pressure (for example, 50 meters of water pressure, 0.5MPa), the waterproof and sound-permeable membrane will be stretched under the pressure, and its micropores will easily become larger, thereby reducing the waterproof performance, and when the pressure remains unchanged, the restoring force (elasticity) decreases, causing the acoustic performance to decrease or lose. Therefore, the service life of the existing waterproof and sound-permeable membrane is relatively low, especially when subjected to a pressure of, for example, 0.5MPa, its waterproof and sound-permeable performance will be greatly reduced, and then it cannot meet the needs of practical applications, which greatly limits the application scope of the waterproof and sound-permeable membrane. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a waterproof and sound-permeable membrane assembly and an electronic device with the waterproof and sound-permeable membrane assembly. The waterproof and sound-permeable membrane assembly can withstand the influence of 0.5MPa pressure (50 meters water pressure) and play a waterproof and sound-permeable role for a long time, thereby ensuring the normal application of the electronic equipment.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a waterproof sound-permeable membrane assembly, comprising a waterproof sound-permeable membrane, a first support plate and an annular side portion, wherein the first support plate is located on the side of the waterproof sound-permeable membrane facing away from the external environment, and a plurality of first sound-permeable holes are arranged on the first support plate; the annular side portion is arranged on the outer edge of the first support plate and forms an installation cavity, and the waterproof sound-permeable membrane is fixed in the installation cavity by a first annular adhesive layer; a first gap is arranged between the first support plate and the waterproof sound-permeable membrane for the waterproof sound-permeable membrane to vibrate freely; the elastic modulus of the first support plate is 50-500MPa; the sound barrier of the waterproof sound-permeable membrane assembly in the audio frequency range of 100-10000Hz is not more than 6dB; the water pressure resistance of the waterproof sound-permeable membrane assembly is at least 0.5MPa.

[0006] By providing a first support plate, the first support plate has a plurality of first sound-permeable holes. The presence of the first sound-permeable holes helps to improve the sound-permeable performance of the waterproof sound-permeable membrane assembly, so that the sound barrier of the assembly is low and the sound-permeable performance is excellent, thereby meeting the needs of practical applications; the elastic modulus of the first support plate is 50-500MPa, and it is not easy to deform under a large pressure; thereby, it can play a greater supporting role for the waterproof sound-permeable membrane, thereby ensuring that the pore size of the waterproof sound-permeable membrane is almost unchanged when the waterproof sound-permeable membrane is subjected to a large pressure (for example, 0.5MPa), and it can still play a waterproof and sound-permeable role and has a long service life, thereby ensuring that the entire waterproof sound-permeable membrane assembly has a large water pressure resistance, and its water pressure resistance is at least 0.5MPa; the waterproof sound-permeable membrane used in the present invention has the characteristics of high hydrophobicity, heat stability, excellent chemical resistance and insulation, and can prevent external water, acid and alkali liquids from entering the microphone of the electronic device, thereby avoiding damage to the microphone, thereby The normal use of the electronic equipment is ensured; at the same time, there is a first gap between the first support plate and the waterproof sound-permeable membrane, which can ensure the free vibration of the waterproof sound-permeable membrane, ensure that the entire waterproof sound-permeable membrane assembly has a low sound barrier, excellent sound transmission performance, and no noise (the tone does not change during the transmission process); when the sound passes through an object, a certain loss will occur; this loss actually refers to the sound barrier of the object. The greater the sound barrier of the object, the greater the sound loss, and the smaller the sound barrier of the object, the smaller the sound loss; the test method of the object sound barrier is: punch the object to be tested into a disc with a diameter of 5.0mm, and then stack the punched material to be tested with a circular double-sided tape with an outer diameter of 5.0mm and an inner diameter of 1.7mm concentrically, the thickness of the double-sided tape is 0.15mm, and finally the double-sided tape is attached to a microphone test board with a sound outlet hole of 1mm diameter and 0.8mm depth. The simulated microphone uses Knowles SPA1687LR5H. An artificial mouth is set 2cm away from the microphone tooling. The simulated microphone and the artificial mouth are connected to an audio analyzer of the Audio Precision x525 model. The audio test software provided by Audio Preciseion is used to make the artificial mouth emit a sound with a frequency of 100Hz-10000Hz and a sound pressure level of 94dBSPL. The response signals of the microphone end with and without the test component mounted on the surface of the microphone tooling are collected and subtracted to finally obtain the sound blocking amount of the corresponding object. The sound blocking amount of the waterproof sound-permeable membrane assembly of the present invention is not more than 6dB, that is, when the sound passes through the waterproof sound-permeable membrane assembly, the sound loss is not more than 6dB, which indicates that the waterproof sound-permeable membrane assembly has excellent sound transmission performance and has a large range of applications;

[0007] By providing an annular side portion, the annular side portion is located at the outer edge of the first support plate and forms an installation cavity, and the waterproof sound-permeable membrane is located in the installation cavity; currently, the waterproof sound-permeable membrane assembly is mainly installed and fixed on the shell of the electronic device through a sticky substance (glue), and in order to further ensure the sealing of the sound receiving parts such as the microphone inside the shell (if the sealing is poor, it will have a great impact on the sound propagation and is easy to leak sound), other objects such as foam are provided. The access method of foam and other objects can be glue, screws, buckles or other methods. At this time, foam and other objects will directly act on the waterproof sound-permeable membrane, causing the waterproof sound-permeable membrane to be compressed and the diaphragm The vibration is affected, and due to the bias pressure (high pressure on one side and low pressure on the other side) and shearing forces, the diaphragm becomes wrinkled and stretched, which in turn affects the sound transmission performance, which is mainly manifested in that the high-frequency sound loss becomes much larger and the audio curve becomes discrete. In the present invention, the pressure positions are mainly concentrated on the first support plate and the annular side part, and the waterproof sound-permeable membrane is not easily compressed (even if there is compression, it is very small), so the membrane vibration will not be affected, thereby solving the problem of discrete audio performance caused by inconsistent pressure on the waterproof sound-permeable membrane in the whole machine, and ensuring excellent sound transmission performance at all frequencies with low sound loss.

[0008] As a further improvement of the present invention, the distance of the first gap is d; the waterproof sound-permeable membrane includes a waterproof sound-permeable area, and the diameter length of the waterproof sound-permeable area is D; when subjected to a pressure of 0.5MPa, the relative deformation E=(2d+AD) / D of the waterproof sound-permeable area is not greater than the elastic limit relative deformation S of the waterproof sound-permeable area; wherein A is the relative deformation of the first support plate under the pressure of 0.5MPa; the range of the elastic limit relative deformation S of the waterproof sound-permeable area is 1-25%.

[0009] In the present invention, if there is only a waterproof sound-permeable membrane but no first support plate, then when subjected to a water inlet pressure of 0.5 MPa (pressure at 50 meters underwater), the waterproof sound-permeable membrane cannot withstand such a huge pressure alone, and the membrane pores are likely to become larger and lose their waterproof effect, or the waterproof sound-permeable membrane undergoes irreversible deformation or even ruptures, then external liquids are likely to enter the microphone, affecting the normal use of the microphone, and then affecting the normal use of the electronic device; therefore, in the present invention, a first support plate is provided, and the first support plate is located on the side of the waterproof sound-permeable membrane assembly close to the microphone, and will not directly contact with external liquids; the first support plate, because it has a large elastic modulus, can support the waterproof sound-permeable membrane, ensuring that when the waterproof sound-permeable membrane is subjected to an external pressure of 0.5 MPa, the membrane pores of the waterproof sound-permeable membrane change very little, and will not undergo irreversible deformation or even rupture, thereby enabling the waterproof sound-permeable membrane to always prevent external liquids from entering the microphone; there is a gap between the waterproof sound-permeable membrane and the first support plate The first gap d ensures that the waterproof sound-permeable membrane and the first support plate are not in direct contact under normal circumstances; the first gap is used to provide a certain vibration space for the waterproof sound-permeable membrane and the first support plate, so as to facilitate the transmission of sound and reduce the loss of sound propagation; the waterproof sound-permeable membrane includes a waterproof sound-permeable area, which is a part of the waterproof sound-permeable membrane (the area on the waterproof sound-permeable membrane that is not adhered to the first annular adhesive layer), and the waterproof sound-permeable area mainly prevents external liquid from entering the microphone; the diameter length of the waterproof sound-permeable area is D, that is, when not subjected to external pressure, the original length of the diameter of the waterproof sound-permeable area is D, and when subjected to external liquid pressure, the waterproof sound-permeable area will deform; when subjected to a water inlet pressure of 0.5 MPa, the deformation length of the waterproof sound-permeable area is 2d+AD, and 2d refers to twice the first gap, because when subjected to such a large pressure, the waterproof sound-permeable area can be regarded as completely fitted with the first support plate; and A is the relative deformation amount of the first support plate when the water inlet pressure is 0.5 MPa, because when the water inlet pressure is 0.When the pressure is 5MPa, in order to make the waterproof sound-permeable membrane work normally, the first support plate will have a supporting force on the waterproof sound-permeable membrane to prevent the waterproof sound-permeable membrane from breaking. Since the force is mutual, the waterproof sound-permeable membrane will also have a corresponding force on the first support plate. Under the action of this force, the first support plate will also undergo a certain deformation. Therefore, in addition to 2d, the deformation length of the waterproof sound-permeable zone will also produce an additional deformation variable, and this additional deformation length is AD; the size of A is related to the elastic modulus of the first support plate. The larger the elastic modulus, the smaller A, and the smaller the elastic modulus, the larger A; the relative deformation variable E=(2d+AD) / D of the waterproof sound-permeable zone is not greater than the elastic limit relative deformation S of the waterproof sound-permeable zone, and the elastic limit relative deformation S of the waterproof sound-permeable zone is greater than 2d. The range of deformation S is 1-25%; when the relative deformation S exceeds the elastic limit, the deformation of the waterproof and sound-permeable zone is no longer elastic deformation, but irreversible deformation; this deformation makes it impossible for the waterproof and sound-permeable zone to return to its original state even when it is not subjected to external pressure, that is, the length of the waterproof and sound-permeable zone can no longer be D, which will greatly affect the waterproof and sound-permeable effect of the waterproof and sound-permeable group; it can no longer meet actual needs; therefore, when the relative deformation of the waterproof and sound-permeable zone is not greater than the relative deformation S of the elastic limit, it not only ensures that the waterproof and sound-permeable membrane assembly has good sound permeability, but also has strong waterproofness. Under the pressure of 0.5MPa, it can still function normally, the microphone can be used normally, and then the normal operation of the electronic equipment is guaranteed. .

[0010] Elastic limit refers to the material being subjected to external force to a certain limit. If the external force is removed, the deformation (elongation) of the material will disappear and return to its original state; but if the external force continues to increase, the material will undergo plastic deformation, that is, irreversible deformation. At this time, even if the external force is removed, the material will not return to its original state; such an external force is called elastic limit pressure; the test method of elastic limit relative deformation: the material to be tested is fixed on the stainless steel hydraulic tooling with a stainless steel cover plate. The stainless steel hydraulic tooling and the stainless steel cover plate both have a circular opening of 5mm diameter and the same position. Then, the optical sensor of the brand Keyence model HK052 is focused on the center of the diaphragm and the initial position b0 is read. The pressure valve is adjusted to increase to the preset pressure P1 at a speed of 20kPa / s and maintained for 1min. The position b1 corresponding to the water pressure deformation is read, and then the pressure is reduced at a speed of 20kPa / s until the water pressure is completely removed. The position b2 after the water pressure is removed is read. If the deviation between b2 and b0 is less than 2um, it can be determined that the pressure P1 is within the elastic pressure range of the material to be tested, and (b1-b0) / 5 is the relative elastic deformation of the material. Increase the preset pressure value at a rate of 1%, and repeat the above steps until the position after the water pressure is removed exceeds 2um from the initial position under the pressure Pn condition. The pressure value Pm of the group before the pressure Pn condition is the elastic limit pressure, and (bm-b0) / 5 under the Pm condition is taken as the relative elastic limit deformation.

[0011] As a further improvement of the present invention, the distance d of the first gap is 0.05-0.3 mm; the diameter length D of the waterproof and sound-permeable area is 1.0 mm-5.0 mm; under the pressure of 0.5 MPa, the relative deformation A of the first support plate is not greater than 0.5%.

[0012] A is the relative deformation of the first support plate when the pressure is 0.5MPa; the calculation formula of A is A=(L2-L1) / L1, where L1 is the original length of the first support plate when no external force is applied; L2 is the length of the first support plate after deformation when subjected to a pressure of 0.5MPa; L2-L1 is the deformation length of the first support plate when subjected to a pressure of 0.5MPa; the size of A has nothing to do with the original length of the first support plate, but is related to the elastic modulus of the first support plate. The larger the elastic modulus, the smaller A, and the smaller the elastic modulus, the larger A; when subjected to a pressure of 0.5MPa, the relative deformation A of the first support plate of the present invention is not greater than 0.5%. Such A ensures that the waterproof and sound-permeable area will not be irreversibly deformed or even ruptured, thereby ensuring that the waterproof and sound-permeable membrane not only has good sound-permeable performance, but also has strong waterproof performance;

[0013] The first gap d between the waterproof sound-permeable membrane and the first support plate is 0.05-0.3mm; the first gap d is used to provide a certain vibration space for the waterproof sound-permeable membrane and the first support plate, which is convenient for the transmission of sound and reduces the loss of sound propagation; when the first gap is too small, that is, the vibration space is too small, it is not conducive to the transmission of sound, it will increase the loss of sound propagation, and the sound blocking amount is too large; when the first gap is too large, when subjected to a water inlet pressure of 0.5MPa, the deformation amount of the waterproof sound-permeable area will also be too large, resulting in irreversible deformation or even rupture; the first gap d between the waterproof sound-permeable membrane of the present invention and the first support plate is 0.05-0.3mm, which is not only conducive to the transmission of sound and reduces sound loss; it can also ensure that when subjected to a water inlet pressure of 0.5MPa, the waterproof sound-permeable area will only undergo elastic deformation, ensuring the normal use of the waterproof transparent membrane assembly; and ensuring that the entire waterproof sound-permeable membrane assembly has a suitable thickness for easy installation;

[0014] In addition, the diameter length D of the waterproof and sound-permeable zone in the present invention is 1.0mm-5.0mm, and preferably, the diameter length D of the waterproof and sound-permeable zone is 1.5mm-4.5mm; if the diameter length of the waterproof and sound-permeable zone is too large, it will be not conducive to the installation of the waterproof and sound-permeable membrane assembly; if the diameter of the waterproof and sound-permeable zone is too small, when the water inlet pressure is 0.5MPa, it will cause the relative deformation of the waterproof and sound-permeable zone to be too large, which may easily cause the waterproof and sound-permeable zone to undergo irreversible deformation or rupture, and thus fail to work normally; the diameter length D of the waterproof and sound-permeable zone of the present invention is 1.0mm-5.0mm, which is convenient for the installation of the waterproof and sound-permeable membrane assembly, and can ensure that when the water inlet pressure is 0.5MPa, the deformation of the waterproof and sound-permeable zone is elastic deformation, thereby ensuring the normal use of the waterproof and sound-permeable zone.

[0015] As a further improvement of the present invention, there is a third gap between the first annular adhesive layer and the annular side portion, and the distance of the third gap is 0.02mm-0.4mm.

[0016] In the present invention, the waterproof sound-permeable membrane is installed and fixed in the installation cavity by the first annular adhesive layer. By providing the third gap, the installation of the waterproof sound-permeable membrane is easier and more convenient. When the third gap is too large, the first annular adhesive layer will deform to both sides after being subjected to pressure, which may easily lead to excessive deformation. On the one hand, it affects the stability of the waterproof sound-permeable membrane and cannot be stably fixed in the installation cavity. On the other hand, it is also easy to affect the sound transmission performance of the waterproof sound-permeable membrane, increase the sound blocking amount of the entire waterproof sound-permeable membrane assembly, and then affect the actual use of the waterproof sound-permeable membrane assembly.

[0017] As a further improvement of the present invention, a second support plate is also included, which is located on the side of the waterproof sound-permeable membrane close to the external environment, and the second support plate, the annular side portion and the first support plate together form an installation cavity; a plurality of second sound-permeable holes are arranged on the second support plate; and a second gap is arranged between the second support plate and the waterproof sound-permeable membrane for the waterproof sound-permeable membrane to vibrate freely.

[0018] In the present invention, the second support plate is located on the side of the waterproof sound-permeable membrane close to the external environment. The second support plate is used to protect the waterproof sound-permeable membrane, so that during the assembly and processing of the waterproof sound-permeable membrane assembly, relatively sharp objects such as manipulators will have an adverse effect on the waterproof and sound-permeable performance of the waterproof sound-permeable membrane, ensuring that the waterproof sound-permeable membrane has high waterproof and sound-permeable performance; at the same time, by arranging a plurality of second sound-permeable holes on the second support plate, the existence of the second sound-permeable holes further ensures that the entire waterproof sound-permeable membrane has a low sound barrier and excellent sound permeability, meeting the needs of practical applications; and there is also a second gap between the second support plate and the waterproof sound-permeable membrane for the waterproof sound-permeable membrane to vibrate freely, so that the existence of the second support plate has little effect on sound transmission, no noise will occur, and the sound loss is also small; it is ensured that the entire waterproof sound-permeable membrane assembly can play a waterproof and sound-permeable role for electronic equipment for a long time.

[0019] As a further improvement of the present invention, one side of the first annular adhesive layer is bonded to the waterproof sound-permeable membrane, and the other side is bonded to the first support plate or the second support plate.

[0020] The present invention bonds and fixes the waterproof sound-permeable membrane in the installation cavity through the first annular adhesive layer; the bonding strength of the first annular adhesive layer is 10-45N / cm, and it has greater viscosity, thereby ensuring that the waterproof sound-permeable membrane can be stably fixed in the installation cavity for a long time; the first annular adhesive layer is a double-sided adhesive, which can be a pressure-sensitive adhesive, a heat-sensitive adhesive, a photosensitive adhesive or other types of double-sided adhesive, and the source is very wide, and the appropriate double-sided adhesive can be selected according to specific actual needs.

[0021] As a further improvement of the present invention, a second annular adhesive layer is provided on the waterproof sound-permeable membrane, and the first annular adhesive layer and the second annular adhesive layer are distributed on both sides of the waterproof sound-permeable membrane; one side of the second annular adhesive layer is bonded to the waterproof sound-permeable membrane, and the other side is bonded to the first support plate or the second support plate.

[0022] A second annular adhesive layer is provided, and the first annular adhesive layer and the second annular adhesive layer are respectively located on both sides of the waterproof sound-permeable membrane; if the first annular adhesive layer is respectively bonded to the first support plate and the waterproof sound-permeable membrane, then the second annular adhesive layer is respectively bonded to the second support plate and the waterproof sound-permeable membrane; and if the first annular adhesive layer is respectively bonded to the second support plate and the waterproof sound-permeable membrane, then the second annular adhesive layer is respectively bonded to the first support plate and the waterproof sound-permeable membrane; through the mutual cooperation of the first annular adhesive layer and the second annular adhesive layer, the first support plate, the annular side, the waterproof sound-permeable membrane and the second support plate together constitute the waterproof sound-permeable membrane assembly required by the present invention; the waterproof sound-permeable membrane assembly can withstand the influence of 0.5MPa pressure (50 meters water pressure), play a waterproof and sound-permeable role for a long time, thereby ensuring the normal application of the electronic equipment; and the pressure on the waterproof sound-permeable membrane assembly on the whole machine is basically the same, and there will be no problem of discrete audio performance; the bonding strength of the second annular adhesive layer is 10-45N / cm, and it has a large viscosity. As a further improvement of the present invention, a third annular adhesive layer is provided on the annular side portion, one side of the third annular adhesive layer is connected to the annular side portion, and the other side of the third annular adhesive layer is bonded to the first support plate or the second support plate.

[0023] By providing a third annular adhesive layer, if one side of the annular side portion is directly fixedly connected to the first support plate (for example, the annular side portion is integrally provided with the first support plate or is connected together by welding or the like), then the side of the annular side portion facing away from the first support plate is connected to the second support plate through the third annular adhesive layer; if one side of the annular side portion is directly fixedly connected to the second support plate (for example, the annular side portion is integrally provided with the first support plate or is connected together by welding or the like), then the side of the annular side portion facing away from the second support plate is connected to the first support plate through the third annular adhesive layer; at this time, the second support plate, the annular side portion and the first support plate jointly form an installation cavity, and the waterproof sound-permeable membrane is located in the installation cavity. One side of the first annular adhesive layer is bonded to the waterproof sound-permeable membrane, and the other side is bonded to the first support plate or the second support plate; through the mutual cooperation of the first annular adhesive layer and the third annular adhesive layer, the first support plate, the annular side, the waterproof sound-permeable membrane and the second support plate together constitute the waterproof sound-permeable membrane assembly required by the present invention; the waterproof sound-permeable membrane assembly can withstand the influence of 0.5MPa pressure (50 meters water pressure), and play a waterproof and sound-permeable role for a long time, thereby ensuring the normal application of electronic equipment; and the pressure exerted on the waterproof sound-permeable membrane assembly on the whole machine is basically the same, and there will be no problem of discrete audio performance; the bonding strength of the third annular adhesive layer is 10-45N / cm, and it has greater viscosity.

[0024] As a further improvement of the present invention, the annular side portion includes a first side portion and a second side portion, the inner diameter of the first side portion is larger than the inner diameter of the second side portion, a fourth annular rubber layer is provided on the second side portion, one side of the fourth annular rubber layer is bonded to the second side portion, and the other side is bonded to the first support plate or the second support plate, and the outer wall of the fourth annular rubber layer is bonded to the inner wall of the first side portion.

[0025] When the membrane is under stress on both sides, especially when subjected to a large force, the membrane vibration is easily affected, which in turn affects the membrane's sound transmission performance and also causes audio dispersion; in order to further reduce the pressure on the membrane; the annular side portion is divided into a first side portion and a second side portion, and the interior of the first side portion is connected to the interior of the second side portion, thereby forming an installation cavity for placing the waterproof sound-transmitting membrane; the inner diameter of the first side portion is larger than the inner diameter of the second side portion, so that a structure similar to a "sink" appears;

[0026] When the first annular side portion is used to bond the waterproof sound-permeable membrane to the first support plate, one side of the fourth annular adhesive layer is bonded to the second side portion, and the other side is bonded to the second support plate, and the outer wall of the fourth annular adhesive layer is bonded to the inner wall of the first side portion, and the outer wall of the second support plate conflicts with the inner wall of the first side portion; or when the first annular side portion is used to bond the waterproof sound-permeable membrane to the second support plate, one side of the fourth annular adhesive layer is bonded to the second side portion, and the other side is bonded to the first support plate, and the outer wall of the fourth annular adhesive layer is bonded to the inner wall of the first side portion, and the outer wall of the first support plate conflicts with the inner wall of the first side portion; through such an annular side portion, and And under the mutual cooperation of the first annular adhesive layer and the fourth annular adhesive layer, the first support plate, the annular side, the waterproof sound-permeable membrane and the second support plate together constitute the waterproof sound-permeable membrane assembly required by the present invention; the waterproof sound-permeable membrane does not have force on both sides, which ensures the normal vibration of the waterproof sound-permeable membrane, and there will be no problems of discrete audio performance or excessive sound loss; in addition, it also ensures that the waterproof sound-permeable membrane assembly can withstand the influence of 0.5MPa pressure (50 meters water pressure), play a waterproof and sound-permeable role for a long time, thereby ensuring the normal application of electronic equipment; the bonding strength of the fourth annular adhesive layer is 10-45N / cm, and it has greater viscosity.

[0027] As a further improvement of the present invention, a first annular adhesive is provided on the side of the second support plate facing away from the waterproof sound-permeable membrane, one side of the first adhesive is bonded to the annular side portion and the second support plate at the same time, and the other side is bonded to the shell, and the width of the first adhesive is greater than the width of the annular side portion.

[0028] A first annular adhesive is provided, which is used to stick and fix the waterproof and sound-permeable membrane assembly to the housing of the electronic device, so that the waterproof and sound-permeable membrane assembly plays a role of waterproof and sound-permeable; at the same time, the first adhesive in the present invention preferably has a larger width, which can simultaneously bond the annular side portion and the second supporting plate together, and is not easy to separate; when the first adhesive simultaneously bonds the annular side portion and the second supporting plate, it is difficult for external liquid to enter the installation cavity through the gap between the annular side portion and the second supporting plate and then affect the normal operation of the waterproof and sound-permeable membrane assembly, thereby further improving the waterproof and sound-permeable properties of the waterproof and sound-permeable membrane assembly; in addition, the bonding strength of the first adhesive is 10-45N / cm, which has a large viscosity, thereby ensuring that the waterproof and sound-permeable membrane assembly can be stuck and fixed on the housing of the electronic device for a long time, is not easy to fall off, and can then play a role of waterproof and sound-permeable for a long time.

[0029] As a further improvement of the present invention, the annular side portion is provided with screws or buckles for connecting to an external carrier.

[0030] At present, the waterproof sound-permeable membrane assembly is mainly installed and fixed on the shell of the electronic device through sticky substances (glue). In order to further ensure the sealing of the sound receiving parts such as the microphone inside the shell (if the sealing is poor, it will have a great impact on the sound propagation and sound leakage is easy to occur), foam and other objects are provided as external carriers to ensure the sealing. The access method of foam and other objects can be through screws or buckles, which is simple and convenient, easy to operate, and at the same time can ensure the overall sealing and ensure high-quality sound transmission. During the transmission process, the sound loss is very small, thus meeting the needs of practical applications.

[0031] As a further improvement of the present invention, the pore size of the waterproof sound-permeable membrane is 0.02-3μm; the thickness is 2-20μm; the water pressure resistance is at least 0.5MPa; the waterproof sound-permeable membrane is ePTFE material; the difference in sound blocking amount of the waterproof sound-permeable membrane assembly in the audio frequency range of 100-10000Hz before and after 0.5MPa30min water pressure is less than 3dB.

[0032] If the thickness of the waterproof sound-permeable membrane is too small, the mechanical properties of the waterproof sound-permeable membrane are poor. If the thickness of the waterproof sound-permeable membrane is too large, the thickness of the entire waterproof sound-permeable membrane assembly is too large, which is not conducive to assembly and processing. The thickness of the waterproof sound-permeable membrane in the present invention is 2-20 μm, which not only ensures that the waterproof sound-permeable membrane has good mechanical properties and meets the needs of industrial production, but also ensures that the entire waterproof sound-permeable membrane assembly has a suitable thickness, which is convenient for subsequent assembly and processing. At the same time, the water pressure resistance of the waterproof sound-permeable membrane in the present invention is at least 0.5 MPa, thereby ensuring that the waterproof sound-permeable membrane can still play a greater waterproof and sound-permeable role when subjected to a large pressure, and has a long service life and high economic benefits.

[0033] The waterproof sound-permeable membrane assembly of the present invention has a sound barrier value of H1 in the audio frequency range of 100-10000 Hz when not subjected to water pressure; the sound barrier value of the waterproof sound-permeable membrane assembly before and after the pressure of 0.5 MPa for 30 min and in the audio frequency range of 100-10000 Hz (the audio frequency remains unchanged) is H2, and the difference between H2 and H1 is less than 3 dB, which illustrates that the sound transmission performance of the waterproof sound-permeable membrane assembly of the present invention is less affected by pressure, and under the pressure of 0.5 MPa, the sound transmission performance of the waterproof sound-permeable membrane assembly is still very good, further illustrating that the waterproof transparent membrane can be used normally under a pressure of 0.5 MPa (for example, a water pressure of 50 m).

[0034] As a further improvement of the present invention, the first support plate is any one of PI, PET, PEEK, PE, PU and metal; the second support plate is any one of PI, PET, PEEK, PE, PU and metal; the elastic modulus of the second support plate is 50-300MPa.

[0035] The first support plate and the second support plate in the present invention are widely available and easy to obtain; the first support plate can provide greater support for the waterproof sound-permeable membrane; the second support plate can be any one of PI, PET, PEEK, PE, PU (and metal materials (such as stainless steel), and its elastic modulus is 50-300MPa, and it will not be damaged under a large pressure; it can protect the waterproof sound-permeable membrane, thereby preventing sharp objects from causing adverse effects on the waterproof and sound-permeable performance of the waterproof sound-permeable membrane during various processing processes; thereby facilitating the installation and processing of the entire waterproof sound-permeable membrane assembly.

[0036] As a further improvement of the present invention, the aperture of the first sound-transmitting hole on the first support plate is 0.1-0.5mm, and the hole area ratio of the first sound-transmitting hole on the outer surface of the first support plate is 5-75%; the aperture of the second sound-transmitting hole on the second support plate is 0.1-0.5mm, and the hole area ratio of the second sound-transmitting hole on the outer surface of the second support plate is 5-75%.

[0037] On the first support plate, the aperture of the first sound-permeable hole is 0.1-0.5mm, and the hole area ratio is 5-75% (preferably 15-65%). Such a setting is beneficial to the excellent sound permeability of the entire waterproof sound-permeable membrane assembly, and the sound blocking amount (insertion loss) is small. At the same time, it does not affect the supporting effect of the first support plate on the waterproof breathable membrane. Under the action of greater pressure, it can still ensure the normal use of the waterproof sound-permeable membrane, so that the entire waterproof sound-permeable membrane assembly has greater water pressure resistance and longer service life; in addition, the aperture of the second sound-permeable hole on the second support plate is 0.1-0.5mm, and the hole area ratio is 5-75% (preferably 15-65%). In addition to further improving the sound permeability of the waterproof sound-permeable membrane assembly, it is more conducive to ensuring the protective effect of the second support plate on the waterproof sound-permeable membrane, preventing the waterproof sound-permeable membrane from being damaged by sharp objects during the early processing and installation process, thereby affecting its waterproof and sound-permeable performance, and reducing economic losses to a minimum.

[0038] As a further improvement of the present invention, the first sound-permeable holes are evenly or unevenly distributed on the outer surface of the first support plate. When evenly distributed, the distribution pattern is rectangular distribution or annular distribution; when unevenly distributed, the distribution pattern is dense in the middle and sparse at the edges; or, sparse in the middle and dense at the edges; or, dense on one side and sparse on the other side; the second sound-permeable holes are evenly or unevenly distributed on the outer surface of the second support plate. When evenly distributed, the distribution pattern is rectangular distribution or annular distribution; when unevenly distributed, the distribution pattern is dense in the middle and sparse at the edges; or, sparse in the middle and dense at the edges; or, dense on one side and sparse on the other side.

[0039] In order to ensure that the entire waterproof sound-permeable membrane assembly has excellent sound-permeable performance, laser drilling or other drilling methods can be used to make a plurality of first sound-permeable holes on the first support plate and a plurality of second sound-permeable holes on the second support plate. The distribution mode of the first sound-permeable holes on the first support plate and the distribution mode of the second sound-permeable holes on the second support plate can be uniformly distributed or unevenly distributed; the uniform distribution mode is mainly a regular distribution mode such as rectangular distribution and annular distribution. When uniformly distributed, laser drilling is relatively easy, the operation is relatively simple, and the required time is less; when the first sound-permeable holes are uniformly distributed on the outer surface of the first support plate, it is ensured that the waterproof performance and sound-permeable performance of each area on the first support plate are the same, and the protective effect of the waterproof sound-permeable membrane on each part of the first support plate is the same and there is no difference; when the second sound-permeable holes are uniformly distributed on the outer surface of the second support plate, it is ensured that the sound-permeable performance of each area on the second support plate and the supporting effect on the waterproof sound-permeable membrane are the same, thereby ensuring that the entire waterproof sound-permeable membrane assembly has good waterproof and sound-permeable performance everywhere, as well as high water pressure resistance, and then has a long service life under strong pressure, and economic benefits;

[0040] The distribution of the first sound-permeable holes on the first support plate and the distribution of the second sound-permeable holes on the second support plate can also be unevenly distributed; because in some special applications, it may be necessary for the first support plate and the second support plate to have a relatively high local property without affecting the waterproofness and sound permeability of the entire waterproof sound-permeable membrane assembly; therefore, it is necessary for the first sound-permeable holes to be unevenly distributed on the first support plate or the second sound-permeable holes to be unevenly distributed on the second support plate; for example, when the uneven distribution of the second sound-permeable holes on the surface of the second support plate is dense in the middle and sparse at the edges, the air permeability in the middle area of ​​the second support plate will be relatively high. , the sound transmission performance will be relatively better; the supporting strength of the edge area of ​​the second support plate is higher, and the mechanical properties are better, which may be more conducive to the installation and processing of the entire waterproof sound-permeable membrane assembly; for example, when the distribution of the second sound-permeable holes on the surface of the second support plate is sparse in the middle and dense on both sides, the middle area of ​​the second support plate has a stronger protective effect on the waterproof sound-permeable membrane, and the waterproof sound-permeable membrane is less likely to be damaged by sharp objects, thereby extending the service life of the waterproof sound-permeable membrane; the uneven distribution of the second sound-permeable holes on the second support plate or the uneven distribution of the first sound-permeable holes on the first support plate is more conducive to increasing the application range of the waterproof sound-permeable membrane assembly.

[0041] As a further improvement of the present invention, an electronic device with a waterproof sound-permeable membrane assembly includes a shell, a sound receiving part arranged inside the shell, and a waterproof sound-permeable membrane assembly installed on the sound receiving part, wherein the waterproof sound-permeable membrane assembly is any one of the waterproof sound-permeable membrane assemblies mentioned above; the shell is provided with an opening for transmitting sound with 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.

[0042] In electronic watches, gaming devices and other electronic devices, in order to prevent liquids such as water and acid rain in the external environment from affecting the normal operation of the microphone and other sound receiving parts and other electronic components inside the shell, a waterproof and sound-permeable membrane assembly will be installed and fixed at the opening of the shell. The waterproof and sound-permeable membrane assembly of the present invention can withstand the influence of 0.5MPa pressure (50 meters of water pressure) and play a waterproof and sound-permeable role for a long time, thereby ensuring the normal application of electronic equipment; the existing waterproof and sound-permeable membrane assemblies are generally used under the condition of compression or force (in order to keep fixed), and in order to ensure the sealing, other objects such as foam will be provided (poor sealing, sound leakage, and great influence on sound propagation), and the top layer of foam or other objects will directly act on the membrane, resulting in compression of the waterproof and sound-permeable membrane and affecting the vibration of the membrane. It will mainly increase the sound loss of high frequencies and make the audio curve discrete; the waterproof and sound-permeable membrane of the present invention is not easily compressed, so the membrane vibration will not be affected, thereby solving the problem of discrete audio performance caused by inconsistent pressure on the waterproof and sound-permeable membrane on the whole machine, and has excellent sound permeability at all frequencies and less sound loss.

[0043] Beneficial effects of the present invention: The waterproof sound-permeable membrane assembly of the present invention is provided with a first support plate, the first support plate has a plurality of first sound-permeable holes, the elastic modulus of the first support plate is 50-500MPa, and it is not easy to deform under a large pressure; thereby, it can play a greater supporting role for the waterproof sound-permeable membrane, thereby ensuring that the waterproof sound-permeable membrane can still play a waterproof and sound-permeable role under a large pressure (for example, 0.5MPa), thereby ensuring that the entire waterproof sound-permeable membrane assembly has a large water pressure resistance, and its water pressure resistance is at least 0.5MPa; at the same time, the sound barrier of the waterproof sound-permeable membrane assembly is not more than 6 dB, excellent sound transmission performance, and a wide range of applications; in addition, an annular side portion is provided, the annular side portion is located at the outer edge of the first support plate and forms an installation cavity, and the waterproof sound-permeable membrane is located in the installation cavity. Such a structural design ensures that when the waterproof sound-permeable membrane assembly and other related components are installed, the pressure positions on the waterproof sound-permeable membrane assembly are mainly concentrated on the first support plate and the annular side portion, and the waterproof sound-permeable membrane is not easily compressed, so the membrane vibration will not be affected, thereby solving the problem of discrete audio performance caused by inconsistent pressure on the waterproof sound-permeable membrane on the whole machine, and ensuring excellent sound transmission performance at all frequencies with less sound loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic structural diagram of a waterproof sound-permeable membrane assembly according to Embodiment 1 of the present invention;

[0045] Figure 2 This is a schematic structural diagram of a waterproof sound-permeable membrane assembly according to Embodiment 2 of the present invention;

[0046] Figure 3 This is a schematic structural diagram of a waterproof sound-permeable membrane assembly according to Embodiment 3 of the present invention;

[0047] Figure 4 This is a schematic structural diagram of a waterproof sound-permeable membrane assembly according to Embodiment 4 of the present invention;

[0048] Figure 5 This is a schematic structural diagram of a waterproof sound-permeable membrane assembly according to Embodiment 5 of the present invention;

[0049] Figure 6 This is a schematic diagram of the structure of a waterproof sound-permeable membrane assembly according to Embodiment 6 of the present invention;

[0050] Figure 7 This is a schematic structural diagram of a waterproof sound-permeable membrane assembly according to Embodiment 7 of the present invention;

[0051] Figure 8 is a schematic structural diagram of the first support plate in Embodiment 1 of the present invention;

[0052] Fig. 9is a schematic structural diagram of the second support plate in Embodiment 1 of the present invention;

[0053] Fig.10 This is a schematic structural diagram of an electronic device with a waterproof sound-permeable membrane assembly according to the present invention;

[0054] Figure numerals: 1, waterproof sound-permeable membrane; 11, waterproof sound-permeable area; 2, first support plate; 21, first sound-permeable hole; 3, annular side; 31, first side; 32, second side; 4, mounting cavity; 41, first gap; 42, second gap; 43, third gap; 5, first annular adhesive layer; 51, second annular adhesive layer; 52, third annular adhesive layer; 53, fourth annular adhesive layer; 6, second support plate; 61, second sound-permeable hole; 7, first adhesive; 8, housing; 81, sound receiving part; 82, opening; 83, screw; DETAILED DESCRIPTION

[0055] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0056] Example 1

[0057] A waterproof sound-permeable membrane assembly comprises a waterproof sound-permeable membrane 1, a first support plate 2, an annular side portion 3 and a second support plate 6, wherein the first support plate 2 is located on the side of the waterproof sound-permeable membrane 1 facing away from the external environment, the first support plate 2 is made of a metal stainless steel material, and the first support plate 2 is provided with a plurality of first sound-permeable holes 21, the aperture of the first sound-permeable holes 21 is 0.3 mm, and the aperture area ratio of the first sound-permeable holes 21 is 40%; the first sound-permeable holes 21 are distributed in a rectangular shape on the outer surface of the first support plate 2; the second support plate 6 is located on the side of the waterproof sound-permeable membrane 1 close to the external environment; the second support plate 6, the annular side portion 3 and the second support plate 6 are ... and the first sound-permeable holes 21 are provided with a plurality of first sound-permeable holes 21, the aperture of the first sound-permeable holes 21 is 0.3 mm, and the aperture area ratio of the first sound-permeable holes 21 is 40%; the first sound-permeable holes 21 are distributed in a rectangular shape on the outer surface of the first support plate 2; the second support plate 6, the annular side portion 3 and The side portion 3 and the first support plate 2 together form a mounting cavity 4; the second support plate 6 is made of PI material, and a plurality of second sound-permeable holes 61 are provided on the second support plate 6; the aperture of the second sound-permeable holes 61 on the second support plate 6 is 0.3 mm, and the aperture area ratio of the second sound-permeable holes 61 on the outer surface of the second support plate 6 is 45%; the second sound-permeable holes 61 are distributed in an annular manner on the outer surface of the second support plate 6; a first gap 41 is provided between the first support plate 2 and the waterproof sound-permeable membrane 1; a second gap 42 is provided between the second support plate 6 and the waterproof sound-permeable membrane 1; the first annular adhesive layer 5 and the annular side portion 3 There is a third gap 43 between the two sides, and the distance of the third gap 43 is 0.1mm; the first annular adhesive layer 5 is bonded to the waterproof sound-permeable membrane 1 and the first support plate 2 on both sides; there is a third annular adhesive layer 52 on the annular side portion 3, one side of the third annular adhesive layer 52 is connected to the annular side portion 3, and the other side is bonded to the second support plate 6; the second support plate 6 has a first adhesive 7 for bonding the shell 8 on the side away from the waterproof sound-permeable membrane 1; the pore size of the waterproof sound-permeable membrane 1 is 1.8μm; the thickness is 10μm; the waterproof sound-permeable membrane 1 is made of ePTFE material; the elasticity of the first support plate 2 The modulus is 250MPa; the distance d of the first gap 41 is 0.15mm; the waterproof and sound-permeable membrane 1 includes a waterproof and sound-permeable area 11, and the diameter length D of the waterproof and sound-permeable area 11 is 3.5mm; under the action of a pressure of 0.5MPa, the relative deformation A of the first support plate 2 is 0.2%; when subjected to a pressure of 0.5MPa, the relative deformation E of the waterproof and sound-permeable area 11 is E=(2d+AD) / D=(2*0.15+0.2%*3.5) / 3.5=8.77%, which is less than the elastic limit relative deformation S of the waterproof and sound-permeable area 11 of 15%.

[0058] Example 2

[0059] A waterproof sound-permeable membrane assembly, comprising a waterproof sound-permeable membrane 1, a first support plate 2, an annular side portion 3, and a second support plate 6, wherein the first support plate 2 is located on the side of the waterproof sound-permeable membrane 1 facing away from the external environment, the first support plate 2 is made of PI material, and the first support plate 2 is provided with a plurality of first sound-permeable holes 21, the aperture of the first sound-permeable holes 21 is 0.3 mm, and the aperture area ratio of the first sound-permeable holes 21 is 35%; the first sound-permeable holes 21 are distributed in an annular manner on the outer surface of the first support plate 2; the second support plate 6 is located on the side of the waterproof sound-permeable membrane 1 close to the external environment; the second support plate 6, the annular side portion 3, and the first support plate 2 Together they form a mounting cavity 4; the second support plate 6 is made of PI material, and there are a plurality of second sound-permeable holes 61 on the second support plate 6; the aperture of the second sound-permeable holes 61 on the second support plate 6 is 0.25 mm, and the hole area ratio of the second sound-permeable holes 61 on the outer surface of the second support plate 6 is 35%; the second sound-permeable holes 61 are distributed in an annular manner on the outer surface of the second support plate 6; there is a first gap 41 between the first support plate 2 and the waterproof sound-permeable membrane 1; a second gap 42 is provided between the second support plate 6 and the waterproof sound-permeable membrane 1; there is a third gap 43 between the first annular adhesive layer 5 and the annular side portion 3, and the third gap 43 The distance is 0.2mm; one side of the first annular adhesive layer 5 is bonded to the waterproof sound-permeable membrane 1, and the other side is bonded to the first support plate 2; the annular side portion includes a first side portion 31 and a second side portion 32, the inner diameter of the first measuring portion is greater than the inner diameter of the second side portion 32, and the second side portion 32 has a fourth annular adhesive layer 53, one side of the fourth annular adhesive layer 53 is bonded to the second side portion 32, and the other side is bonded to the second support plate 6, and the outer wall of the fourth annular adhesive layer 53 is bonded to the inner wall of the first side portion 31; the second support plate 6 has a first adhesive 7 on the side facing away from the waterproof sound-permeable membrane 1, and one side of the first adhesive 7 It is bonded to the annular side portion 3 and the second support plate 6 at the same time, and the other side is bonded to the shell 8, and the width of the first adhesive 7 is greater than the width of the annular side portion 3; the pore size of the waterproof sound-permeable membrane 1 is 2.4μm; the thickness is 6μm; the waterproof sound-permeable membrane 1 is made of ePTFE material; the elastic modulus of the first support plate 2 is 100MPa; the distance d of the first gap 41 is 0.10mm; the waterproof sound-permeable membrane 1 includes a waterproof sound-permeable area 11, and the diameter length D of the waterproof sound-permeable area 11 is 2.0mm; under the pressure of 0.5MPa, the relative deformation A of the first support plate 2 is 0.3%;

[0060] When subjected to a pressure of 0.5 MPa, the relative deformation E of the waterproof and sound-permeable area 11 is (2d+AD) / D=(2*0.10+0.3%*2) / 2=10.30%, which is less than the elastic limit relative deformation S of the waterproof and sound-permeable area 11 of 20%.

[0061] Example 3

[0062] A waterproof sound-permeable membrane assembly, comprising a waterproof sound-permeable membrane 1, a first support plate 2, an annular side portion 3, and a second support plate 6, wherein the first support plate 2 is located on the side of the waterproof sound-permeable membrane 1 facing away from the external environment, the first support plate 2 is made of PEEK material, and the first support plate 2 is provided with a plurality of first sound-permeable holes 21, the aperture of the first sound-permeable holes 21 is 0.35 mm, and the aperture area ratio of the first sound-permeable holes 21 is 45%; the first sound-permeable holes 21 are distributed in a rectangular shape on the outer surface of the first support plate 2; the second support plate 6 is located on the side of the waterproof sound-permeable membrane 1 close to the external environment; the second support plate 6, the annular side portion 3, and the first support plate 2 jointly form an installation cavity 4; the second support plate The plate 6 is made of PU material, and there are several second sound-permeable holes 61 on the second support plate 6; the aperture of the second sound-permeable holes 61 on the second support plate 6 is 0.35mm, and the hole area rate of the second sound-permeable holes 61 on the outer surface of the second support plate 6 is 50%; the second sound-permeable holes 61 are distributed in a rectangular shape on the outer surface of the second support plate 6; there is a first gap 41 between the first support plate 2 and the waterproof sound-permeable membrane 1; there is a second gap 42 between the second support plate 6 and the waterproof sound-permeable membrane 1; there is a third gap 43 between the first annular adhesive layer 5 and the annular side portion 3, and the distance of the third gap 43 is 0.15mm; one side of the first annular adhesive layer 5 is bonded to the waterproof sound-permeable membrane 1, and the other side is bonded to the waterproof sound-permeable membrane 1. One side is bonded to the first support plate 2; there is a second annular adhesive layer 51 on the waterproof sound-permeable membrane 1, and the first annular adhesive layer 5 and the second annular adhesive layer 51 are respectively located on both sides of the waterproof sound-permeable membrane 1; one side of the second annular adhesive layer 51 is bonded to the waterproof sound-permeable membrane 1, and the other side is bonded to the second support plate 6; the second support plate 6 has a first adhesive 7 on the side away from the waterproof sound-permeable membrane 1, one side of the first adhesive 7 is bonded to the annular side portion 3 and the second support plate 6 at the same time, and the other side is bonded to the shell 8, and the width of the first adhesive 7 is greater than the width of the annular side portion 3; the pore size of the waterproof sound-permeable membrane 1 is 1.4μm; the thickness is 14μm; the waterproof sound-permeable The acoustic membrane 1 is made of ePTFE material; the elastic modulus of the first support plate 2 is 300 MPa; the distance d of the first gap 41 is 0.20 mm; the waterproof and sound-permeable membrane 1 includes a waterproof and sound-permeable area 11, and the diameter length D of the waterproof and sound-permeable area 11 is 3.5 mm; under the action of a pressure of 0.5 MPa, the relative deformation A of the first support plate 2 is 0.15%; when subjected to a pressure of 0.5 MPa, the relative deformation E of the waterproof and sound-permeable area 11 is E=(2d+AD) / D=(2*0.2+0.15%*3.5) / 3.5=11.58%, which is less than the elastic limit relative deformation S of the waterproof and sound-permeable area 11 of 18%.

[0063] Example 4

[0064] A waterproof sound-permeable membrane assembly, comprising a waterproof sound-permeable membrane 1, a first support plate 2, an annular side portion 3, and a second support plate 6, wherein the first support plate 2 is located on the side of the waterproof sound-permeable membrane 1 facing away from the external environment, the first support plate 2 is made of PET material, and is provided with a plurality of first sound-permeable holes 21 on the first support plate 2, the aperture of the first sound-permeable holes 21 is 0.35 mm, and the hole area rate of the first sound-permeable holes 21 is 50%; the first sound-permeable holes 21 are distributed in an annular manner on the outer surface of the first support plate 2; the second support plate 6 is located on the side of the waterproof sound-permeable membrane 1 close to the external environment; the second support plate 6, the annular side portion 3, and the first support plate 2 jointly form an installation cavity 4; the second support plate 6 is made of metal stainless steel material, and is provided with a plurality of second sound-permeable holes 61 on the second support plate 6; the aperture of the second sound-permeable holes 61 on the second support plate 6 is 0.4 mm, and the hole area rate of the second sound-permeable holes 61 on the outer surface of the second support plate 6 is 55%; the second sound-permeable holes 61 are densely distributed in the middle and sparsely distributed at the edge on the outer surface of the second support plate 6; the first support plate 2 and the waterproof sound-permeable membrane 1; there is a first gap 41 between the second support plate 6 and the waterproof sound-permeable membrane 1; there is a second gap 42 between the second support plate 6 and the waterproof sound-permeable membrane 1; there is a third gap 43 between the first annular adhesive layer 5 and the annular side portion 3, and the distance of the third gap 43 is 0.1mm; one side of the first annular adhesive layer 5 is bonded to the waterproof sound-permeable membrane 1, and the other side is bonded to the second support plate 6; there is a third annular adhesive layer 52 on the annular side portion 3, one side of the third annular adhesive layer 52 is connected to the annular side portion 3, and the other side is bonded to the first support plate 2; the second support plate 6 is away from the waterproof A first adhesive 7 for bonding the housing 8 is provided on one side of the sound-permeable membrane 1; the pore size of the waterproof sound-permeable membrane 1 is 1.0 μm; the thickness is 16 μm; the waterproof sound-permeable membrane 1 is made of ePTFE material; the elastic modulus of the first support plate 2 is 350 MPa; the distance d of the first gap 41 is 0.25 mm; the waterproof sound-permeable membrane 1 includes a waterproof sound-permeable area 11, and the diameter length D of the waterproof sound-permeable area 11 is 4.0 mm; under the action of a pressure of 0.5 MPa, the relative deformation A of the first support plate 2 is 0.1%;

[0065] When subjected to a pressure of 0.5 MPa, the relative deformation E of the waterproof and sound-permeable area 11 is (2d+AD) / D=(2*0.25+0.1%*4) / 4=12.60%, which is less than the elastic limit relative deformation S of the waterproof and sound-permeable area 11, which is 16%.

[0066] Example 5

[0067] A waterproof sound-permeable membrane assembly comprises a waterproof sound-permeable membrane 1, a first support plate 2, and an annular side portion 3. The first support plate 2 is located on the side of the waterproof sound-permeable membrane 1 that is away from the external environment. The first support plate 2 is made of a metal stainless steel material. There are a plurality of first sound-permeable holes 21 on the first support plate 2. The aperture of the first sound-permeable hole 21 is 0.15 mm, and the aperture area ratio of the first sound-permeable hole 21 is 30%; the first sound-permeable holes 21 are distributed in a rectangular shape on the outer surface of the first support plate 2; the annular side portion 3 and the first support plate 2 form an installation cavity 4; the waterproof sound-permeable membrane 1 is located in the installation cavity 4; there is a first gap 41 between the first support plate 2 and the waterproof sound-permeable membrane 1; there is a third gap 43 between the first annular adhesive layer 5 and the annular side portion 3, and the distance of the third gap 43 is 0.08 mm; one side of the first annular adhesive layer 5 is adjacent to the waterproof sound-permeable membrane 1; The waterproof and sound-permeable membrane 1 is bonded to each other, and the other side is bonded to the first support plate 6; the pore size of the waterproof and sound-permeable membrane 1 is 1.3μm; the thickness is 9μm; the waterproof and sound-permeable membrane 1 is made of ePTFE material; the elastic modulus of the first support plate 2 is 400MPa; the distance d of the first gap 41 is 0.13mm; the waterproof and sound-permeable membrane 1 includes a waterproof and sound-permeable area 11, and the diameter length D of the waterproof and sound-permeable area 11 is 4.0mm; under the action of a pressure of 0.5MPa, the relative deformation A of the first support plate 2 is 0.08%; when subjected to a pressure of 0.5MPa, the relative deformation E of the waterproof and sound-permeable area 11 is E=(2d+AD) / D=(2*0.13+0.08%*4.0) / 4.0=6.58%, which is less than the elastic limit relative deformation S of the waterproof and sound-permeable area 11, which is 12%.

[0068] Example 6

[0069] A waterproof sound-permeable membrane assembly, comprising a waterproof sound-permeable membrane 1, a first support plate 2, an annular side portion 3, and a second support plate 6, wherein the first support plate 2 is located on the side of the waterproof sound-permeable membrane 1 facing away from the external environment, the first support plate 2 is made of a metal stainless steel material, and the first support plate 2 is provided with a plurality of first sound-permeable holes 21, the aperture of the first sound-permeable holes 21 is 0.2 mm, and the aperture area ratio of the first sound-permeable holes 21 is 45%; the first sound-permeable holes 21 are distributed in an annular manner on the outer surface of the first support plate 2; the second support plate 6 is located on the side of the waterproof sound-permeable membrane 1 close to the external environment; the second The support plate 6, the annular side portion 3 and the first support plate 2 together form a mounting cavity 4; the second support plate 6 is made of a metal stainless steel material, and a plurality of second sound-permeable holes 61 are provided on the second support plate 6; the aperture of the second sound-permeable holes 61 on the second support plate 6 is 0.2 mm, and the hole area ratio of the second sound-permeable holes 61 on the outer surface of the second support plate 6 is 45%; the second sound-permeable holes 61 are distributed in an annular manner on the outer surface of the second support plate 6; a first gap 41 is provided between the first support plate 2 and the waterproof sound-permeable membrane 1; a second gap 42 is provided between the second support plate 6 and the waterproof sound-permeable membrane 1;

[0070] There is a third gap 43 between the first annular adhesive layer 5 and the annular side portion 3, and the distance of the third gap 43 is 0.15mm; one side of the first annular adhesive layer 5 is bonded to the waterproof sound-permeable membrane 1, and the other side is bonded to the second support plate 6; there is a second annular adhesive layer 51 on the waterproof sound-permeable membrane 1, and the first annular adhesive layer 5 and the second annular adhesive layer 51 are respectively located on both sides of the waterproof sound-permeable membrane 1; one side of the second annular adhesive layer 51 is bonded to the waterproof sound-permeable membrane 1, and the other side is bonded to the first support plate 2; the second support plate 6 has a first adhesive 7 for bonding the shell 8 on the side away from the waterproof sound-permeable membrane 1; the pore size of the waterproof sound-permeable membrane 1 is 1.6μm; the thickness is 12μm; The waterproof and sound-permeable membrane 1 is made of ePTFE material; the elastic modulus of the first support plate 2 is 300 MPa; the distance d of the first gap 41 is 0.18 mm; the waterproof and sound-permeable membrane 1 includes a waterproof and sound-permeable area 11, and the diameter length D of the waterproof and sound-permeable area 11 is 3.0 mm; under the action of a pressure of 0.5 MPa, the relative deformation A of the first support plate 2 is 0.15%; when subjected to a pressure of 0.5 MPa, the relative deformation amount E of the waterproof and sound-permeable area 11 is E=(2d+AD) / D=(2*0.18+0.15%*3.0) / 3.0=12.15%, which is less than the elastic limit relative deformation S of the waterproof and sound-permeable area 11 of 15%.

[0071] Example 7

[0072] A waterproof sound-permeable membrane assembly, comprising a waterproof sound-permeable membrane 1, a first support plate 2, an annular side portion 3 and a second support plate 6, wherein the first support plate 2 is located on the side of the waterproof sound-permeable membrane 1 away from the external environment, the first support plate 2 is made of PU, and the first support plate 2 is provided with a plurality of first sound-permeable holes 21, the aperture of the first sound-permeable holes 21 is 0.25 mm, and the aperture area ratio of the first sound-permeable holes 21 is 40%; the first sound-permeable holes 21 are distributed in a rectangular shape on the outer surface of the first support plate 2;

[0073] The second support plate 6 is located on the side of the waterproof sound-permeable membrane 1 close to the external environment; the second support plate 6, the annular side portion 3 and the first support plate 2 together form a mounting cavity 4; the second support plate 6 is made of PI material, and there are a plurality of second sound-permeable holes 61 on the second support plate 6; the aperture of the second sound-permeable holes 61 on the second support plate 6 is 0.25 mm, and the aperture area ratio of the second sound-permeable holes 61 on the outer surface of the second support plate 6 is 40%; the second sound-permeable holes 61 are distributed sparsely in the middle and densely at the edges on the outer surface of the second support plate 6; the first support There is a first gap 41 between the support plate 2 and the waterproof sound-permeable membrane 1; there is a second gap 42 between the second support plate 6 and the waterproof sound-permeable membrane 1; there is a third gap 43 between the first annular adhesive layer 5 and the annular side portion 3, and the distance of the third gap 43 is 0.2mm; one side of the first annular adhesive layer 5 is bonded to the waterproof sound-permeable membrane 1, and the other side is bonded to the second support plate 6; the annular side portion includes a first side portion 31 and a second side portion 32, the inner diameter of the first measuring portion is greater than the inner diameter of the second side portion 32, and the second side portion 32 has a fourth annular The fourth annular adhesive layer 53 is bonded to the second side portion 32 on one side and to the first support plate 2 on the other side, and the outer wall of the fourth annular adhesive layer 53 is bonded to the inner wall of the first side portion 31; the second support plate 6 has a first adhesive 7 for bonding the shell 8 on the side away from the waterproof sound-permeable membrane 1, the pore size of the waterproof sound-permeable membrane 1 is 2 μm; the thickness is 8 μm; the waterproof sound-permeable membrane 1 is made of ePTFE material; the elastic modulus of the first support plate 2 is 200 MPa; the distance d of the first gap 41 is 0 .12mm; the waterproof and sound-permeable membrane 1 includes a waterproof and sound-permeable area 11, and the diameter length D of the waterproof and sound-permeable area 11 is 2.5mm; under the action of a pressure of 0.5MPa, the relative deformation A of the first support plate 2 is 0.25%; when subjected to a pressure of 0.5MPa, the relative deformation E of the waterproof and sound-permeable area 11 is E=(2d+AD) / D=(2*0.12+0.25%*2.5) / 2.5=9.85%, which is less than the elastic limit relative deformation S of the waterproof and sound-permeable area 11 of 14%.

[0074] In the waterproof and sound-permeable membrane assemblies of Examples 1-7, when subjected to a pressure of 0.5 MPa, the waterproof and sound-permeable membrane undergoes elastic deformation, without any irreversible deformation or even rupture. This shows that the waterproof and sound-permeable membrane assembly of the present invention can withstand the influence of 0.5 MPa pressure (50 meters water pressure) and play a waterproof and sound-permeable role for a long time.

[0075] The waterproof sound-permeable membrane assemblies of Examples 1-7 were tested for water pressure resistance. After testing, it was found that the water pressure resistance of the waterproof sound-permeable membrane assemblies of Examples 1-7 was greater than 0.5 MPa, which further illustrates that the waterproof sound-permeable membrane assemblies prepared in Examples 1-7 can withstand the influence of 0.5 MPa pressure (50 meters of water pressure) and have a wide range of applications. The waterproof sound-permeable membrane assemblies prepared in Examples 1-7 were tested for sound blocking at 100 Hz-10000 Hz:

[0076] The test results are as follows:

[0077]

[0078]

[0079] It can be seen from the above table that the waterproof sound-permeable membrane assembly of the present invention has good sound permeability at 100-10000HZ, and the sound blocking amount is very small; especially the sound loss at high frequencies changes little, and the application range is very wide.

[0080] Among the 50,000 samples of Example 1, 100 samples were randomly selected for comparison tests on sound loudness and timbre before and after film pasting, and then corresponding audio discrete curves were made. The test found that at 100-10000HZ, the upper and lower differences in the sound barrier amounts of the 100 samples of Example 1 were less than 0.5dB at 100HZ and less than 1.0dB at 10000HZ, indicating that there is no problem of audio performance discreteness, and the audio performance remains basically consistent, which can meet the needs of practical applications.

[0081] The waterproof and sound-permeable membrane assemblies of Examples 1-7 were subjected to a pressure of 0.5 MPa (who could it be) for 30 minutes, and then the sound blocking amount was tested. The test found that the difference in sound blocking amount of the waterproof and sound-permeable membrane assemblies of Examples 1-7 in the audio frequency range of 100-10000 Hz before and after the pressure of 0.5 MPa for 30 minutes was less than 3 dB, which further illustrates that the waterproof and sound-permeable membrane assemblies can withstand the influence of 0.5 MPa pressure (50 meters water pressure), the sound blocking amount changes very little, and still has good sound transmission performance, and has a very wide range of applications.

[0082] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A waterproof sound-permeable membrane assembly, characterized in that: The device comprises a waterproof sound-permeable membrane, a first support plate and an annular side portion, wherein the first support plate is located on a side of the waterproof sound-permeable membrane away from the external environment, and a plurality of first sound-permeable holes are arranged on the first support plate; the annular side portion is arranged on the outer edge of the first support plate and forms an installation cavity, and the waterproof sound-permeable membrane is fixed in the installation cavity by a first annular adhesive layer; a first gap is arranged between the first support plate and the waterproof sound-permeable membrane for the waterproof sound-permeable membrane to vibrate freely; The elastic modulus of the first support plate is 50-500 MPa; The sound barrier of the waterproof sound-permeable membrane assembly in the audio frequency range of 100-10000 Hz is no more than 6 dB; the water pressure resistance of the waterproof sound-permeable membrane assembly is at least 0.5 MPa; There is a third gap between the first annular adhesive layer and the annular side portion, and the distance of the third gap is 0.02mm-0.4mm; The pore size of the waterproof sound-permeable membrane is 0.02-3 μm; The thickness is 2-20μm; the water pressure resistance is at least 0.5MPa.

2. A waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The distance of the first gap is d; The waterproof sound-permeable membrane comprises a waterproof sound-permeable area, and the diameter length of the waterproof sound-permeable area is D; When subjected to a pressure of 0.5 MPa, the relative deformation amount E=(2d+AD) / D of the waterproof and sound-permeable area is not greater than the elastic limit relative deformation amount S of the waterproof and sound-permeable area; Where A is the relative deformation of the first support plate under a pressure of 0.5 MPa; The elastic limit relative deformation amount S of the waterproof and sound-permeable area is in the range of 1-25%.

3. A waterproof sound-permeable membrane assembly according to claim 2, characterized in that: The distance d of the first gap is 0.05-0.3 mm; The diameter length D of the waterproof and sound-permeable area is 1.0 mm to 5.0 mm; Under the action of a pressure of 0.5 MPa, the relative deformation A of the first support plate is no greater than 0.5%.

4. A waterproof sound-permeable membrane assembly according to claim 1, 2 or 3, characterized in that: It also includes a second support plate, which is located on the side of the waterproof sound-permeable membrane close to the external environment. The second support plate, the annular side portion and the first support plate together form an installation cavity; a plurality of second sound-permeable holes are arranged on the second support plate; and a second gap is arranged between the second support plate and the waterproof sound-permeable membrane for the waterproof sound-permeable membrane to vibrate freely.

5. A waterproof sound-permeable membrane assembly according to claim 4, characterized in that: One side of the first annular adhesive layer is bonded to the waterproof sound-permeable membrane, and the other side is bonded to the first supporting plate or the second supporting plate.

6. The waterproof sound-permeable membrane assembly according to claim 4, characterized in that: A second annular adhesive layer is provided on the waterproof sound-permeable membrane, and the first annular adhesive layer and the second annular adhesive layer are respectively located on both sides of the waterproof sound-permeable membrane; one side of the second annular adhesive layer is bonded to the waterproof sound-permeable membrane, and the other side is bonded to the first support plate or the second support plate.

7. The waterproof sound-permeable membrane assembly according to claim 4, characterized in that: A third annular adhesive layer is arranged on the annular side portion, one side of the third annular adhesive layer is connected with the annular side portion, and the other side of the third annular adhesive layer is bonded with the first supporting plate or the second supporting plate.

8. The waterproof sound-permeable membrane assembly according to claim 4, characterized in that: The annular side portion includes a first side portion and a second side portion, the inner diameter of the first side portion is greater than the inner diameter of the second side portion, a fourth annular adhesive layer is provided on the second side portion, one side of the fourth annular adhesive layer is bonded to the second side portion, and the other side of the fourth annular adhesive layer is bonded to the first support plate or the second support plate, and the outer wall of the fourth annular adhesive layer is bonded to the inner wall of the first side portion.

9. The waterproof sound-permeable membrane assembly according to claim 4, characterized in that: A first annular adhesive is provided on the side of the second support plate facing away from the waterproof sound-permeable membrane. One side of the first adhesive is bonded to the annular side and the second support plate at the same time, and the other side is bonded to the shell. The width of the first adhesive is greater than the width of the annular side.

10. The waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The annular side portion is provided with screws or buckles for connecting to an external carrier.

11. The waterproof sound-permeable membrane assembly according to claim 1, characterized in that: The waterproof and sound-permeable membrane is made of ePTFE material; The difference in sound barrier value of the waterproof sound-permeable membrane assembly in the audio frequency range of 100-10000 Hz is less than 3 dB before and after the water pressure of 0.5 MPa for 30 min.

12. The waterproof sound-permeable membrane assembly according to claim 4, characterized in that: The first support plate is any one of PI, PET, PEEK, PE, PU and metal; The second support plate is any one of PI, PET, PEEK, PE, PU and metal; the elastic modulus of the second support plate is 50-300 MPa.

13. The waterproof sound-permeable membrane assembly according to claim 4, characterized in that: The aperture of the first sound-transmitting hole on the first support plate is 0.1-0.5 mm, and the aperture area ratio of the first sound-transmitting hole on the outer surface of the first support plate is 5-75%; The aperture of the second sound-transmitting hole on the second support plate is 0.1-0.5 mm, and the aperture area ratio of the second sound-transmitting hole on the outer surface of the second support plate is 5-75%.

14. The waterproof sound-permeable membrane assembly according to claim 4, characterized in that: The first sound-permeable holes are evenly distributed or unevenly distributed on the outer surface of the first support plate. When evenly distributed, the distribution is rectangular or annular; when unevenly distributed, the distribution is dense in the middle and sparse at the edge; or sparse in the middle and dense at the edge; or dense on one side and sparse on the other side; The second sound-permeable holes are evenly or unevenly distributed on the outer surface of the second support plate. When evenly distributed, the distribution pattern is rectangular distribution or annular distribution; when unevenly distributed, the distribution pattern is dense in the middle and sparse at the edges; or sparse in the middle and dense at the edges; or dense on one side and sparse on the other side.

15. An electronic device with a waterproof sound-permeable membrane assembly, characterized in that: It includes a shell, a sound receiving part arranged inside the shell, and a waterproof sound-permeable membrane assembly installed on the sound receiving part, wherein the waterproof sound-permeable membrane assembly is the waterproof sound-permeable membrane assembly according to any one of claims 1 to 14; 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.

Images