A waterproof sound permeable film assembly and electronic equipment

Abstract

The application discloses a waterproof sound-permeable film assembly, and solves the problem of poor sound-permeable performance of the waterproof sound-permeable film assembly when the waterproof sound-permeable film assembly is subjected to assembly external force or other external force. The waterproof sound-permeable film assembly comprises a waterproof sound-permeable film, a supporting piece, an adhesive piece and a shifting piece. The waterproof sound-permeable film comprises a sound-permeable area and an annular fixing area, and the fixing area is located at an edge area of the waterproof sound-permeable film. The supporting piece is located at two sides of the waterproof sound-permeable film and has an annular structure. The adhesive piece is bonded with the fixing area and the supporting piece. The adhesive piece has an annular structure. The shifting piece is located at a side of the waterproof sound-permeable film close to an external environment, is connected with the supporting piece, and has an annular structure. When external force acts, the shifting piece and the supporting piece have a shifting action. Through the cooperative action of the supporting piece and the shifting piece, the film piece is prevented from being wrinkled when various external forces act, the sound-permeable performance is good, audio consistency is high, and the sound resistance of a high frequency band is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film materials, in particular to a waterproof sound-permeable film assembly and electronic equipment. BACKGROUND

[0002] The waterproof sound-permeable film is a waterproof material for an acoustic component made of an ultra-thin film, mainly used for protecting electro-acoustic devices such as loudspeakers, receivers, microphones, etc. of electronic devices such as mobile phones, tablets, game devices and electronic watches, to prevent water, dust and other foreign matters from entering and affecting the sound emission and reception of the electronic devices, thereby avoiding adverse effects on the sound quality. It combines the functions of waterproofing and sound permeability, allowing sound to be transmitted through the film material while maintaining waterproof performance, and the sound quality is basically unchanged.

[0003] At present, the waterproof sound-permeable film assembly on the market is usually of a structure of glue + film + glue (the film is a waterproof sound-permeable film, the glue on one side of the film is used for bonding acoustic devices such as microphones, and the glue on the other side of the film is used for bonding the shell), which is simple in structure, easy to manufacture and widely used. However, it is found in actual use that the waterproof sound-permeable film of the existing waterproof sound-permeable film assembly may have a slight wrinkle and other problems of uneven film sheet. In the sound-permeable field, especially in deep water sound-permeable field, any slight change of the waterproof sound-permeable film will affect the sound-permeable performance (especially in the case of high water pressure resistance). According to research, at low frequency, the sound-permeable film mainly relies on the film aperture and the film porosity for sound transmission; at medium and high frequency, especially at high frequency, the sound transmission mainly relies on the vibration of the waterproof sound-permeable film itself. Therefore, if the waterproof sound-permeable film has a slight wrinkle, the local area of the film sheet is raised or has a corrugated phenomenon, which will affect the film aperture and cause uneven vibration of each area at medium and high frequency, and the vibration of the wrinkle part at medium and high frequency will cause large sound loss, thereby greatly affecting the sound-permeability of the waterproof sound-permeable film. For example: 1. Poor audio consistency, that is, after the sound loss test under the same hertz condition, the sound loss values of the waterproof sound-permeable film assemblies of the same batch are relatively dispersed, that is, the maximum sound loss value and the minimum sound loss value are greatly different, thereby causing the quality of the products of the same batch to be uneven and the qualified rate to be low; 2. Abnormal sound loss at high frequency band (greater than 1000 hertz, especially greater than 6000 hertz), in which the sound loss of the high frequency area of some products is abnormally large, causing the waterproof sound-permeable film assembly to be unable to transmit sound and thus unable to be used. The existence of the above problems makes the waterproof sound-permeable film assembly unable to meet the requirements of actual application, which greatly limits the application range of the waterproof sound-permeable film. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a waterproof sound-permeable film assembly and electronic equipment, which can effectively reduce the risk of wrinkles and other factors affecting the flatness of the film sheet of the waterproof sound-permeable film, improve the audio consistency of the waterproof sound-permeable film assembly, and avoid abnormal sound loss at high frequency band.

[0005] To solve the above technical problems, the present application adopts the following technical solutions: a waterproof sound-permeable film assembly, comprising:

[0006] a waterproof sound-permeable film, which comprises a sound-permeable area for waterproof sound permeation and a ring-shaped fixing area located at the edge area of the waterproof sound-permeable film;

[0007] a support located on both sides of the waterproof sound-permeable film, which is a ring-shaped structure;

[0008] an adhesive located on one side of the fixing area and on the other side of the support, which is a ring-shaped structure;

[0009] a shifting member located on the side of the waterproof sound-permeable film close to the external environment, which is connected with the support and is a ring-shaped structure; under the action of external force, the shifting member and the support have a shifting effect.

[0010] The waterproof sound-permeable film assembly in the prior art needs to be subjected to various inspections and meet the set requirements before being allowed to leave the factory, and a simulated client-side compression assembly test (i.e., simulating the assembly of the waterproof sound-permeable film assembly to the shell and performing a pressure test) is also provided before leaving the factory. However, after the client actually assembles the waterproof sound-permeable film assembly to the shell, it is found that the overall sound-permeable performance of the waterproof sound-permeable film assembly is poor (mainly manifested as poor audio consistency, large high-frequency sound loss, etc.). Observation shows that this is mainly due to the poor flatness of the waterproof sound-permeable film (e.g., slight wrinkles, local area protrusions, or wave-like phenomena on some sound-permeable film pieces). However, it is generally believed that the poor flatness of the waterproof sound-permeable film is caused by the die-cutting process during the production of the waterproof sound-permeable film or by the use conditions after installation. After researchers observed the waterproof sound-permeable film assembly before compression assembly, during compression assembly, and after compression assembly, it was found that the poor flatness of the waterproof sound-permeable film was mainly caused by external forces during compression assembly and other external forces (e.g., water pressure) during use. This is because the shear strength between the glue and the film of the waterproof sound-permeable film assembly is weak, and the rigidity of the entire assembly is not strong enough. Therefore, when the waterproof sound-permeable film assembly is assembled on the shell of an electronic device, it is impossible to ensure that the assembly external force is uniformly applied to the waterproof sound-permeable film assembly, and it is also impossible to ensure that the waterproof sound-permeable film assembly is subjected to uniform other external forces (e.g., water pressure) during use, i.e., subjected to pressure perpendicular to the surface of the waterproof sound-permeable film. Therefore, a transverse shear force is formed on the waterproof sound-permeable film, which causes the waterproof sound-permeable film assembly to be not uniformly compressed, and thus the waterproof sound-permeable film is slightly displaced under the action of the assembly external force or water pressure, e.g., stretched, wrinkled, or even locally protruded or wave-like.

[0011] In order to solve the above technical problems, the researchers generally change waterproof sound permeable film (select different aperture, different material, different thickness of waterproof sound permeable film) or change glue (select different bonding strength, different material, different thickness of glue) two technical directions to improve, but it is found that the wrinkle problem still cannot be avoided after use. Among them, changing the glue mainly increases the thickness of the glue, so as to ensure that the glue and the waterproof sound permeable film are firmly bonded, and the entire waterproof sound permeable film assembly and the shell are tightly bonded, but since the glue is soft, the thicker the glue, the weaker the shear strength between the glue and the film, and under the action of external force, the waterproof sound permeable film is more prone to wrinkle and various sound permeability problems.

[0012] In the present application, on the other hand, support members are arranged on both sides of the waterproof sound permeable film, and the support members are arranged in correspondence with the fixing areas (the fixing area is the area of the waterproof sound permeable film for bonding with the adhesive member) of the waterproof sound permeable film. Since the support members are harder and more rigid than the waterproof sound permeable film, the two support members can clamp the fixing area of the waterproof sound permeable film (equivalent to clamping the edge area of the waterproof sound permeable film, and clamping from top to bottom), so that the two support members can flatten the waterproof sound permeable film, thereby ensuring the flatness of the waterproof sound permeable film, and preventing the waterproof sound permeable film from being easily wrinkled or having a local area of the film protruding or having ripples when subjected to certain external force (especially shear external force, transverse shear force).

[0013] In addition, the present application further provides an offset member arranged on the side of the waterproof sound permeable film close to the external environment, and the offset member is connected with the support member. When subjected to external force (assembly external force or other external force during use), the offset member and the support member have a certain offset effect, that is, the offset member can move slightly relative to the support member (relative movement). This can at least partially replace the offset of the adhesive member relative to the waterproof sound permeable film (and then replace the deformation of the waterproof sound permeable film), thereby reducing or preventing the offset of the adhesive member relative to the waterproof sound permeable film, and further reducing the possibility of the waterproof sound permeable film being wrinkled and affecting the flatness of the film when subjected to external force.

[0014] At the same time, it is found through research that when the support member and the offset member exist at the same time, the possibility of the offset between the waterproof sound permeable film and the adhesive member is greatly reduced, and the entire waterproof sound permeable film assembly has better sound permeability under high frequency, thereby avoiding abnormal sound loss (which can also be referred to as sound blocking amount) at high frequency, and ensuring that the sound permeability of each waterproof sound permeable film assembly in the batch is basically consistent, thereby improving the audio consistency.

[0015] As a further improvement of the present application, the offset member is a glue member, the glue member is bonded with 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 0.02mm.

[0016] In this way, on the one hand, the offset piece is fixed to the shell and the support in a bonded manner (one side of the offset piece is bonded to the shell, and the other side is bonded to the support), which is easier to connect the offset piece to the support and the shell than other connection methods, thereby reducing the assembly difficulty of the offset piece and the support and the assembly difficulty of the waterproof sound-permeable membrane assembly and the shell. The thickness of the offset piece is not less than 0.02 mm, because if the offset piece is too thin, the offset piece cannot offset relative to the support, and if the thickness of the offset piece is larger, the offset is more likely to occur. Therefore, the thickness of the offset piece is set to not less than 0.02 mm to ensure that the offset piece can offset. At the same time, when the offset piece is a glue piece, if the thickness of the offset piece is too small, it will also affect the bonding strength of the offset piece and the support and the shell, especially for a metal shell, a slightly thicker offset piece may be required. In addition, it has been found in the research of the present application that when the ratio of the thickness of the offset piece to the thickness of the adhesive piece is 1.2-6 (the offset piece is slightly thicker than the adhesive piece), the offset piece and the support are relatively more likely to offset under the action of a certain external force, and then the adhesive piece and the waterproof sound-permeable membrane are relatively more difficult to offset. In particular, when the offset piece is a glue piece with a certain thickness, the offset piece and the support can offset appropriately, further reducing the possibility of slight wrinkles of the waterproof sound-permeable membrane under a certain external force. The presence of the offset piece (glue piece) and the adhesive piece helps to ensure that the support holds the waterproof sound-permeable membrane for a long time, supports for a long time, further ensures that the sound-permeable membrane assembly has good sound transmission performance in the high frequency band, and has good sound loss consistency.

[0017] As a further improvement of the present application, the glue piece comprises a first base material layer and a first glue layer arranged along the thickness direction thereof, and the two first glue layers are located on both sides of the first base material layer. The offset piece is bonded to the support through one of the first glue layers.

[0018] By setting the glue piece as a double-sided adhesive structure, rather than a glue liquid structure without a base material layer, the hardness of the glue piece can be increased by the first base material layer, avoiding the glue piece being too soft, thereby avoiding excessive or uncontrollable offset of the offset piece relative to the support. The offset piece can be bonded to the shell and the support for a long time, thereby ensuring that the entire waterproof sound-permeable membrane assembly functions as a waterproof sound-permeable membrane for a long time.

[0019] As a further improvement of the present application, the thickness of the support is 0.8-5 times, preferably 1.2-3 times, the thickness of the adhesive piece. The thickness of the adhesive piece is 0.01 mm-0.08 mm.

[0020] In the prior art, in order to ensure the bonding strength of the adhesive and the waterproof sound permeable film, the researchers usually control the adhesive (glue) to be slightly thicker, so as to ensure that the adhesive and the sound permeable film are firmly bonded, and the entire waterproof sound permeable film assembly and the shell are tightly bonded; but in the present application, due to the arrangement of the support, in order to ensure that the overall thickness of the entire waterproof sound permeable film assembly is not too high (if the thickness is too high, the entire waterproof sound permeable film assembly cannot be installed on the shell),

[0021] Therefore, the thickness of the adhesive needs to be relatively thin, and after research, the thickness of the adhesive is controlled to be 0.01mm-0.08mm, which on the one hand makes the entire waterproof sound permeable film assembly have a suitable thickness, which is suitable for subsequent assembly processing and can meet the needs of customers, and on the other hand, the thickness of the adhesive is not too small, which ensures sufficient adhesive force and reliable connection between the adhesive and the waterproof sound permeable film; unexpectedly, due to the reduction of the thickness of the adhesive, it is unexpectedly found that the probability of creep between the diaphragm and the adhesive is reduced, which is probably because the adhesive is relatively soft, and after the thickness of the adhesive is reduced, the shear strength between the adhesive and the waterproof sound permeable film is increased, thereby further reducing the possibility of wrinkles of the waterproof sound permeable film which affects the flatness of the diaphragm; in addition, the thickness of the support is set to be 0.8-5 times, preferably 1.2-3 times the thickness of the adhesive, because the larger the thickness of the adhesive, the greater the possibility of deviation, and therefore the support needs to be harder and more rigid, and the thickness is an important factor affecting the rigidity of the support; under a suitable ratio, the support can stably clamp the waterproof sound permeable film; the thickness of the support can be randomly selected, but after further research, the thickness is also controlled, and therefore the ratio of the thickness of the support to the thickness of the adhesive can make the thickness of the support more reasonable, and the support with a suitable thickness can not only play a suitable supporting role, but also have a smaller influence on the overall thickness of the entire assembly.

[0022] As a further improvement of the present application, the waterproof sound permeable film assembly further comprises a ring-shaped protective member, the protective member is located on the side of the waterproof sound permeable film away from the external environment, and the protective member is connected to the side of the support away from the waterproof sound permeable film, and there is a deviation between the protective member and the support under the action of external force.

[0023] By such design, when the waterproof sound-permeable membrane assembly is subjected to external force on the side away from the outside world, the protective piece can be offset relative to the support piece, which can at least partially replace the offset between the adhesive piece and the waterproof sound-permeable membrane (replace the partial deformation of the waterproof sound-permeable membrane), so as to reduce or prevent the relative offset between the waterproof sound-permeable membrane and the adhesive piece, and further reduce the possibility of slight wrinkling of the waterproof sound-permeable membrane when subjected to external force. In addition, it is found that under the action of low water pressure (for example, under the water pressure of 6 meters or less), the waterproof sound-permeable membrane assembly is subjected to a small pressing force of the acoustic device (especially the microphone plate), and thus the offset force (transverse shear force) is also small. Only under the action of the offset piece, the double-layer support piece structure (support piece + glue + membrane + glue + support piece) can be ensured not to be deformed, so that the waterproof sound-permeable membrane is not wrinkled, the audio performance consistency is ensured, and the high-frequency sound loss is low. Under high water pressure (for example, water pressure greater than 6 meters), especially under the water pressure of 50 meters and 100 meters for watches, the waterproof sound-permeable membrane assembly is subjected to a large pressing force of the microphone plate, and thus the offset force is also large. At this time, the double-layer support piece structure needs the joint action of the offset pieces and the protective pieces on both sides to ensure that the double-layer support piece structure is not deformed, so as to ensure the audio performance consistency and the low high-frequency sound loss. That is, compared with the single-sided offset piece, the protective piece has better protection effect, so that the waterproof sound-permeable membrane assembly can withstand higher water pressure and has a wider application range.

[0024] As a further improvement of the present application, the protective piece is an adhesive piece, the protective piece is bonded with the support piece, and the thickness of the protective piece is greater than the thickness of the adhesive piece; and the ratio of the thickness of the protective piece to the thickness of the offset piece is 1:1.1-1:4.

[0025] The protective piece is fixed on the acoustic device and the support in a bonding manner, which facilitates the connection of the protective piece with the support and the acoustic device, and reduces the assembly difficulty of the protective piece and the support and the assembly difficulty of the waterproof sound-permeable film assembly and the acoustic device; the thickness of the protective piece is greater than the thickness of the adhesive piece, so that the flowability of the adhesive piece is lower than the flowability of the protective piece, which makes the shear strength between the adhesive piece and the waterproof sound-permeable film greater than the shear strength between the protective piece and the support, so that the protective piece and the support are more likely to deviate when subjected to an external force, rather than the adhesive piece and the waterproof sound-permeable film, thereby further avoiding the possibility of the waterproof sound-permeable film being wrinkled, especially when the protective piece is a certain thickness of the adhesive piece, which is more likely to deviate appropriately; the ratio of the thickness of the protective piece to the thickness of the deviation piece is 1:1.1-1:4, which is designed in this way because the protective piece is subjected to a relatively small pressing force of the microphone plate, so the bonding force required is relatively low and the amount of deviation required is relatively small, while the deviation piece is subjected to a relatively large external force and needs to ensure sufficient bonding force and deviation amount, so the thickness of the deviation piece needs to be greater than the thickness of the protective piece (the deviation piece is relatively closer to the outside), but the ratio of the thickness of the two is not less than 0.25, so that the deviation piece is not too thick to deviate excessively or the protective piece is not too thin to deviate.

[0026] As a further improvement of the present application, the thickness of the waterproof sound-permeable film 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.

[0027] In this way, by selecting a waterproof sound-permeable film with an appropriate thickness, the rigidity of the waterproof sound-permeable film can be ensured, avoiding being too thin to be easily processed and being prone to wrinkling, and avoiding being too thick to increase the thickness of the entire assembly; then by reasonably selecting the pore size and porosity, the waterproof sound-permeable film can have a very strong waterproof sound-permeable effect, and the glue of the adhesive piece can be infiltrated into the waterproof sound-permeable film in an appropriate amount; and the setting of the water pressure resistance can make the waterproof sound-permeable film have a water pressure resistance of at least 1 KPa, so that the waterproof sound-permeable film can still play a larger waterproof sound-permeable role when subjected to a larger pressure, and has a longer service life.

[0028] As a further improvement of the present application, the support is any one of PET, PE, PP, PI and stainless steel sheet; the hardness of the support is not less than 15HV0.1, the thickness is 0.02-0.2mm, the grammage is 0.03-0.3g / m2, and the surface energy is 20-50mN / m; as a preferred, the hardness of the support is 20-90HV0.1.

[0029] Thus, the materials are wide, easy to obtain and cheap, and the hardness (in the present application, the hardness is represented by Vickers hardness, 0.1" represents a test force of 0.1 kgf), thickness and grammage are reasonably selected, so that the support is easy to process and has sufficient rigidity and hardness to reduce the deformation ability of the support, thereby avoiding the bending deformation of the waterproof sound permeable film due to low rigidity and hardness under external force, and wrinkles of the waterproof sound permeable film are avoided. In addition, the surface energy of the support is limited to 20-50 mN / m, which has a suitable surface energy to facilitate the bonding of the adhesive and the support, and also avoids being infiltrated by water, thereby reducing the amount of water infiltrated into the waterproof sound permeable film through the support, and the waterproof performance of the waterproof sound permeable film assembly is improved.

[0030] As a further improvement of the present application, 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 waterproof sound permeable film is 0.8-2.

[0031] Since the second glue layer is soft, the thickness of the second glue layer needs to be reasonably controlled, so that the adhesive and the waterproof sound permeable film have sufficient adhesion and are not easy to separate, and the second glue layer is not too thick to cause the adhesive to be more likely to deviate from the support, and the ratio of the thickness of the second glue layer to the waterproof sound permeable film is controlled within a suitable range, so that the possibility of deviation between the adhesive and the waterproof sound permeable film is further reduced.

[0032] As a further improvement of the present application, the present application also provides an electronic device comprising a shell, an acoustic device arranged inside the shell and a waterproof sound permeable film assembly, the waterproof sound permeable film assembly is the waterproof sound permeable film assembly of any of the above technical solutions, and the shell is provided with an opening for transmitting sound with the external environment, and the waterproof sound permeable film assembly covers the opening to prevent water from entering the shell from the outside through the opening. Thus, the acoustic performance of the electronic device (mainly the electronic device with a microphone) can be improved, which has good sound permeability at various frequencies, low sound loss and high audio consistency, thereby improving the user experience.

[0033] The features and advantages of the present application will be described in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0034] The present application will be further described below with reference to the drawings:

[0035] Figure 1 FIG. 1 is a structural schematic diagram of a waterproof sound permeable film assembly according to an embodiment of the present application;

[0036] Figure 2 Structure diagram of the adhesive in the embodiment one of the present application

[0037] Figure 3 Structure diagram of the offsetting member in the embodiment one of the present application

[0038] Figure 4 Structure diagram of the waterproof sound-permeable membrane assembly in the embodiment two of the present application

[0039] Figure 5 Curve diagram of the sound damage test of the waterproof sound-permeable membrane assembly in the embodiment two of the present application

[0040] Figure 6 Curve diagram of the sound damage test of the waterproof sound-permeable membrane assembly in the prior art

[0041] Figure 7 Simplified diagram of the electronic device in the embodiment three of the present application

[0042] Reference signs:

[0043] 100, waterproof sound-permeable membrane assembly; 110, waterproof sound-permeable membrane; 111, sound-permeable area; 112, fixed area; 120, supporting member; 130, adhesive; 131, second base material layer; 132, second glue layer; 140, offsetting member; 141, first base material layer; 142, first glue layer; 150, protective member; 160, foam; 200, shell; 210, opening; 300, acoustic device. DETAILED DESCRIPTION

[0044] The technical solutions of the embodiments of the present application will be explained and described below in combination with the drawings of the embodiments of the present application. The following embodiments are only preferred embodiments of the present application, and not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. In addition, it should be understood that the words indicating the orientation or position relationship such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "vertical", "horizontal", "top", "bottom" and the like are only based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices / components must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Embodiment one

[0045] Reference Figures 1 to 3As shown, the waterproof sound-permeable membrane assembly 100 in the embodiment includes a waterproof sound-permeable membrane 110, a support 120, an adhesive 130, and a shift 140. The waterproof sound-permeable membrane 110 includes a sound-permeable area 111 for waterproof sound permeation and a ring-shaped fixed area 112 located at the edge area of the waterproof sound-permeable membrane and surrounding the outside of the sound-permeable area 111. The support 120 is located on both sides of the waterproof sound-permeable membrane 110 and has a ring-shaped structure. The adhesive 130 also has a ring-shaped structure, with one side of the adhesive 130 bonded to the fixed area 112 and the other side bonded to the support 120. The shift 140 is located on the side of the waterproof sound-permeable membrane 110 close to the external environment and has a ring-shaped structure. The shift 140 is connected to the support 120. When an external force is applied, the shift 140 and the support 120 have a shift effect.

[0046] In the embodiment, the support 120 is arranged on both sides of the waterproof sound-permeable membrane 110, and the support 120 is arranged correspondingly to the fixed area 112 (the fixed area 112 is the area of the waterproof sound-permeable membrane 110 for bonding with the adhesive 130) of the waterproof sound-permeable membrane 110. Since the support 120 has greater hardness than the waterproof sound-permeable membrane 110, it has greater rigidity. Thus, the two supports 120 can clamp the fixed area 112 (equivalent to clamping the edge area of the waterproof sound-permeable membrane 110, and clamping from top to bottom) of the waterproof sound-permeable membrane 110. Then, the two supports 120 can pull the waterproof sound-permeable membrane 110 flat, thereby ensuring the flatness of the waterproof sound-permeable membrane 110. When the waterproof sound-permeable membrane 110 is subjected to certain external forces (especially shear external forces, transverse shear forces), it is less likely to have slight wrinkles, and even less likely to have local area bulging or corrugation.

[0047] In addition, in the embodiment, the shift 140 is connected to the support 120. When an external force (assembly external force or other external force during use) is applied, the shift 140 and the support 120 have a certain shift effect, i.e., the shift 140 can move slightly relative to the support 120 (relative movement). Thus, the shift 140 can at least partially replace the shift 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 shift of the adhesive 130 relative to the waterproof sound-permeable membrane 110. Thus, the possibility of the waterproof sound-permeable membrane 110 being slightly wrinkled and affecting the flatness of the membrane when subjected to an external force is further reduced.

[0048] Meanwhile, research has found that when the support 120 and the offset 140 are present at the same time, the possibility of misalignment between the waterproof sound-permeable membrane 110 and the adhesive 130 is greatly reduced. 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) in the high-frequency band and excessive sound loss. In addition, the sound transmission of each waterproof sound-permeable membrane assembly 100 in the batch is basically consistent, thereby improving audio consistency.

[0049] The test method for sound blocking (sound loss) is as follows:

[0050] 1. Mount the sample to be tested onto an audio test board with a sound outlet hole of 1 mm in diameter and 0.8 mm in depth. The Knowles SPA1687LR5H is preferred for the analog microphone.

[0051] 2. Place an artificial mouth 2cm away from the microphone fixture. Both the analog microphone and the artificial mouth are connected to an audio analyzer (such as the Audio Precision x525 model).

[0052] 3. Using the built-in audio testing software of Audio Preciseion, the artificial mouth was made to emit a sound with a frequency of 100Hz-10000Hz and a sound pressure level of 94dBSPL;

[0053] 4. Collect and subtract the response signals from the microphone end under the conditions of having test components mounted on the surface of the audio test board and without test components mounted, 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.

[0054] Those skilled in the art will understand that, in addition to the methods described above, other suitable measurement methods can be used to obtain this parameter. The measurement methods listed here are for reference only (e.g., according to the relevant standards of the Acoustic Impedance and Transmission Loss Test Specification ASTM E2611 / IEC 60268-16).

[0055] Specifically, the waterproof sound-permeable film 110 in the embodiment is any one of nylon film, polyethylene film, polypropylene film, polytetrafluoroethylene film and polyimide film, which are very extensive, easy to obtain and inexpensive. The waterproof sound-permeable film 110 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. Such design can ensure the rigidity of the waterproof sound-permeable film 110 by selecting a waterproof sound-permeable film 110 with a proper thickness, avoiding too thin to be easily processed and prone to wrinkle, and avoiding too thick to increase the thickness of the entire assembly; then by reasonably selecting the pore size and porosity, the waterproof sound-permeable film 110 can have a strong waterproof sound-permeable effect, and the adhesive of the adhesive member 130 can be infiltrated into the waterproof sound-permeable film 110 in an appropriate amount. The water pressure resistance can make the waterproof sound-permeable film have a water pressure resistance of at least 1 KPa, so that the waterproof sound-permeable film 110 can still have a large waterproof sound-permeable effect when subjected to a large pressure, and has a long service life.

[0056] The support member 120 is any one of PET, PE, PP, PI and stainless steel sheet, which are very extensive, easy to obtain and inexpensive.

[0057] The hardness of the support member 120 is not less than 15 HV0.1, and preferably, the hardness of the support member is 20-90 HV0.1; the thickness of the support member 120 is 0.02-0.2 mm, and the grammage is 0.03-0.3 g / m 2 , and the surface energy is 20-50 mN / m. Such design can facilitate the processing of the support member 120, and ensure that the support member 120 has sufficient rigidity and hardness to reduce the deformation ability of the support member 120, thereby avoiding the bending deformation of the support member 120 due to low rigidity and hardness, which causes the waterproof sound-permeable film 110 to wrinkle; in addition, limiting the surface energy of the support member 120 to 20-50 mN / m can also make the surface of the support member 120 have appropriate hydrophobicity and hydrophilicity, so as to facilitate the adhesion of the adhesive member 130 and the support member 120, and also avoid being infiltrated by water, thereby reducing the amount of water infiltrated from the support member 120 to the waterproof sound-permeable film 110, and thus improving the waterproof performance of the waterproof sound-permeable film assembly 100.

[0058] In addition, the adhesive 130 in the embodiment is a double-sided adhesive structure such as a heat-sensitive adhesive, a pressure-sensitive adhesive, or a light-sensitive adhesive, which includes a second substrate layer 131 and a second glue layer 132 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, the thickness of the second glue layer 132 needs to be reasonably controlled to ensure that the adhesive 130 and the waterproof sound-permeable film 110 have sufficient bonding force and are not easily separated, and to avoid the second glue layer 132 being too thick, which makes the adhesive 130 more likely to deviate from the support 120. In addition, by controlling the ratio of the thickness of the second glue layer 132 to the thickness of the waterproof sound-permeable film 110 to be within the range of 0.8 to 2, the possibility of deviation between the adhesive 130 and the waterproof sound-permeable film 110 can be further reduced.

[0059] Secondly, the deviation piece 140 in the embodiment is an adhesive piece bonded to the support 120. This design can fix the deviation piece 140 to the shell of the electronic device and the support 120 in a bonded manner (one side of the deviation piece 140 is bonded to the shell, and the other side is bonded to the support 120). Compared with other connection methods, the bonded fixing method can facilitate the connection of the deviation piece 140 with the support 120 and the shell, thereby reducing the assembly difficulty of the deviation piece 140 with the support 120 and the assembly difficulty of the waterproof sound-permeable film assembly 100 with the shell. In addition, the thickness of the deviation piece 140 in the embodiment is not less than 0.02 mm. If the thickness of the deviation piece 140 is less than 0.02 mm, the deviation piece 140 will be too thin to deviate from the support 120. If the thickness of the deviation piece 140 is greater, the deviation piece 140 is more likely to deviate. Therefore, the thickness of the deviation piece 140 is set to be not less than 0.02 mm to ensure that the deviation piece 140 can deviate. At the same time, when the deviation piece 140 is an adhesive piece, if the thickness of the deviation piece 140 is too small, it will affect the bonding strength of the deviation piece 140 with the support 120 and the shell, especially for a metal shell, which may require a slightly thicker deviation piece 140. In addition, research in the embodiment shows that when the ratio of the thickness of the deviation piece 140 to the thickness of the adhesive 130 is 1.2-6 (the deviation piece 140 is slightly thicker than the adhesive 130), the deviation piece 140 and the support 120 are more likely to deviate relative to each other when subjected to a certain external force. Therefore, the adhesive 130 and the waterproof sound-permeable film 110 are less likely to deviate relative to each other. In particular, when the deviation piece 140 is an adhesive piece with a certain thickness, the deviation piece 140 and the support 120 can deviate appropriately, further reducing the possibility of the waterproof sound-permeable film 110 being slightly wrinkled when subjected to a certain external force. The presence of the adhesive 130 and the deviation piece 140 (adhesive piece) is conducive to ensuring that the support 120 holds the waterproof sound-permeable film 110 for a long time and plays a supporting role for a long time.

[0060] Preferred, such as Figure 3 As shown, the offset member 140 in this embodiment can be a double-sided adhesive such as a heat-sensitive adhesive, pressure-sensitive adhesive, or photosensitive adhesive. It includes a first substrate layer 141 and a first adhesive layer 142 disposed along its thickness direction. The two first adhesive layers 142 are located on both sides of the first substrate layer 141. The first substrate layer 141 is a PI or PET substrate. The offset member 140 is bonded to the support member 120 on the side closer to the external environment through one of the first adhesive layers 142. By setting the adhesive part as a double-sided adhesive structure, rather than a structure fixed by adhesive and without a substrate layer, the first substrate layer 141 can be used to increase the hardness of the adhesive part, avoiding the adhesive part being too soft. This avoids the offset member 140 from shifting too much or uncontrollably relative to the support member 120. The offset member 140 can be bonded to the shell and the support member 120 for a long time, thereby ensuring that the entire waterproof and sound-permeable membrane assembly 100 can play a waterproof and sound-permeable role for a long time.

[0061] Preferably, the thickness of the support 120 in the embodiment is 0.8-5, preferably 1.2-3 times the thickness of the adhesive 130; the thickness of the adhesive 130 is 0.01 mm -0.08mm. In the prior art, since there is no support 120, in order to ensure the bonding strength of the glue and the waterproof sound film, the researchers usually control the adhesive (glue) to be slightly thicker, so as to ensure that the adhesive and the waterproof sound film are firmly bonded, and the entire waterproof sound film assembly and the shell are tightly bonded; but in the embodiment, since the support 120 is provided, in order to ensure that the overall thickness of the entire waterproof sound film assembly is not too high (if the thickness is too high, the entire waterproof sound film assembly cannot be installed on the shell), the thickness of the adhesive 130 needs to be relatively thin. After research, the thickness of the adhesive 130 is controlled to be 0.01mm -0.08mm. Such design, on the one hand, makes the entire waterproof sound film assembly have a suitable thickness, which is suitable for subsequent assembly processing and can meet the needs of customers, and on the other hand, the thickness of the adhesive 130 is not too small, which ensures sufficient adhesive force and reliable connection between the adhesive 130 and the waterproof sound film 110. Surprisingly, due to the reduction of the thickness of the adhesive 130, it is unexpectedly found that the probability of creep between the waterproof sound film 110 and the adhesive 130 is reduced. This is probably because the adhesive 130 is relatively soft, and after the thickness of the adhesive 130 is reduced, the shear strength between the adhesive 130 and the waterproof sound film 110 is increased, thereby further reducing the possibility of wrinkles and other factors affecting the flatness of the diaphragm of the waterproof sound film 110; and the adhesive force of the adhesive 130 is sufficient to improve the connection reliability between the adhesive 130 and the waterproof sound film 110. In addition, in the embodiment, the thickness of the support 120 is set to be 0.8-5, preferably 1.2-3 times the thickness of the adhesive 130. If the thickness of the adhesive 130 is larger, the possibility of deviation is larger, so the support 120 needs to be harder and more rigid, and the thickness is an important factor affecting the rigidity of the support 120. At a suitable ratio, the support 120 can stably clamp the waterproof sound film 110. That is, the thickness of the support 120 can be randomly selected, but after further research, the thickness is also controlled to be optimal. Therefore, limiting the ratio of the thickness of the support 120 to the thickness of the adhesive 130 can make the thickness of the support 120 more reasonable. The support 120 with a suitable thickness not only plays a suitable supporting role, but also has a smaller impact on the overall thickness of the entire assembly.

[0062] It should be noted that under the action of low water pressure (for example, under the action of water pressure of 6 meters or less), the waterproof sound transmission film assembly 100 in the embodiment is subjected to a relatively small pressing force of the acoustic device (especially the microphone plate), and thus is subjected to a relatively small offset force (lateral shear force). Only under the action of the offset member 140, the double-layer support member structure (support member 120 + glue + film + glue + support member 120) can be prevented from deforming, so that the waterproof sound transmission film 110 is prevented from being wrinkled, and the audio performance consistency is ensured, and the high-frequency sound loss is low. Embodiment Two

[0063] As shown in Figure 4 Unlike the first embodiment, the waterproof sound transmission film assembly 100 in the embodiment further includes a ring-shaped protective member 150. The protective member 150 is located on the side of the waterproof sound transmission film 110 away from the external environment, and is connected to the side of the support member 120 away from the waterproof sound transmission film 110. When an external force acts, the protective member 150 and the support member 120 are offset relative to each other.

[0064] This is because under the action of high water pressure (for example, under the action of water pressure greater than 6 meters), especially under the action of water pressure of 50 meters and 100 meters applied to a watch, the waterproof sound transmission film assembly 100 is subjected to a relatively large pressing force of the microphone plate, and thus is subjected to a relatively large offset force. At this time, the inner adhesive member 130 is offset relative to the waterproof sound transmission film 110, and the waterproof sound transmission film 110 is wrinkled. That is, under the action of high water pressure (for example, under the action of water pressure greater than 6 meters), especially under the action of water pressure of 50 meters and 100 meters applied to a watch, the waterproof sound transmission film assembly 100 in the first embodiment has poor sound transmission performance, poor audio consistency, and large high-frequency sound loss.

[0065] To solve the above technical problems, in the embodiment, the protective member 150 is added. When an external force acts on the side of the waterproof sound transmission film assembly 100 away from the external environment, the protective member 150 is offset relative to the support member 120, which at least partially replaces the offset between the adhesive member 130 and the waterproof sound transmission film 110 (replaces the partial deformation of the waterproof sound transmission film 110), so as to reduce or prevent the relative offset between the waterproof sound transmission film 110 and the adhesive member 130, and further reduce the possibility of slight wrinkling of the waterproof sound transmission film 110 under the action of an external force. That is, under the action of high water pressure (for example, under the action of water pressure greater than 6 meters), especially under the action of water pressure of 50 meters and 100 meters applied to a watch, the waterproof sound transmission film assembly 100 is subjected to a relatively large pressing force of the microphone plate, and thus is subjected to a relatively large offset force. At this time, the double-layer support member 120 structure needs to be deformed under the combined action of the offset members 140 and the protective member 150 on both sides of the double-layer support member 120 structure, so as to ensure the audio performance consistency and low high-frequency sound loss. That is, after the protective member 150 is added, compared with the case where only one side has the offset member 140, the protective effect is better, the waterproof sound transmission film assembly 100 can withstand higher water pressure, and thus the use environment diversity of the waterproof sound transmission film assembly 100 is increased, and the application range is wider.

[0066] The protective piece 150 in the embodiment is an adhesive piece, and the protective piece 150 is bonded with the support piece 120. In this way, the protective piece 150 can be fixed on the acoustic device and the support piece 120 in a bonded manner. Compared with other connection modes, the bonded fixing mode can facilitate the connection of the protective piece 150 with the support piece 120 and the acoustic device, so as to reduce the assembly difficulty of the protective piece 150 with the support piece 120 and the assembly difficulty of the waterproof sound-permeable membrane assembly 100 with the acoustic device. In addition, the thickness of the protective piece 150 is greater than the thickness of the adhesive piece 130, so that the flowability of the adhesive piece 130 is lower than the flowability of the protective piece 150. In this way, the shear strength between the adhesive piece 130 and the waterproof sound-permeable membrane 110 is greater than the shear strength between the protective piece 150 and the support piece 120, so that when an external force is applied, the protective piece 150 and the support piece 120 are more likely to be offset, while the adhesive piece 130 and the waterproof sound-permeable membrane 110 are less likely to be offset. Therefore, the possibility of the waterproof sound-permeable membrane 110 being wrinkled is further avoided. In particular, the protective piece 150 is an adhesive piece with a certain thickness, which is more likely to be offset appropriately. Finally, the ratio of the thickness of the protective piece 150 to the thickness of the offset piece 140 is 1:1.1-1:4. In this way, the bonding force required by the protective piece 150 is relatively low because the pressing force of the microphone plate on the protective piece 150 is relatively small, and the offset amount required by the protective piece 150 is relatively small. In addition, the offset piece 140 is subjected to a greater external force and needs to ensure sufficient bonding force and offset amount. Therefore, the thickness of the offset piece 140 needs to be greater than the thickness of the protective piece 150 (the offset piece 140 is relatively closer to the outside), but the ratio of the thickness of the offset piece 140 to the thickness of the protective piece 150 is not less than 0.25. In this way, it can be avoided that the offset piece 140 is too thick to be excessively offset, or the protective piece 150 is too thin to be offset.

[0067] It can be understood that in other embodiments of the present application, the offset piece can also be a gel layer formed after the gel is solidified. Comparative Example One

[0068] The waterproof sound-permeable membrane assembly 100 in the embodiment includes a waterproof sound-permeable membrane 110, a support piece 120, and an adhesive piece 130. The waterproof sound-permeable membrane 110 includes a sound-permeable area 111 for waterproof sound permeation and a ring-shaped 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 piece 120 is located on both sides of the waterproof sound-permeable membrane 110, and the support piece 120 has a ring-shaped structure. The adhesive piece 130 has a ring-shaped structure, one side of the adhesive piece 130 is bonded with the fixed area 112, and the other side of the adhesive piece 130 is bonded with the support piece 120. The specific structure and related parameters of the waterproof sound-permeable membrane 110, the support piece 120, and the adhesive piece 130 can be set as in Embodiment One, and will not be described in detail here. Comparative Example Two

[0069] The waterproof sound-transmitting film assembly of the embodiment comprises a waterproof sound-transmitting film 110, a support 120 and an adhesive 130. The waterproof sound-transmitting film 110 comprises a sound-transmitting area 111 for waterproof sound transmission and a ring-shaped fixing area 112 located at the edge area of the waterproof sound-transmitting film and surrounding the outside of the sound-transmitting area 111. The support 120 is located at the side of the waterproof sound-transmitting film 110 close to the external environment and has a ring structure. The adhesive 130 has a ring structure, one side of the adhesive 130 close to the external environment is bonded to the fixing area 112, and the other side is bonded to the support 120. One side of the other adhesive 130 is bonded to the fixing area 112, and the other side is bonded to the acoustic device. The specific structure and related parameters of the waterproof sound-transmitting film 110, the support 120 and the adhesive 130 can be set as in Embodiment 1, and will not be described in detail here. Comparative Example 3

[0070] The waterproof sound-transmitting film assembly of the embodiment comprises a waterproof sound-transmitting film 110, a support 120 and an adhesive 130. The waterproof sound-transmitting film 110 comprises a sound-transmitting area 111 for waterproof sound transmission and a ring-shaped fixing area 112 located at the edge area of the waterproof sound-transmitting film and surrounding the outside of the sound-transmitting area 111. The support 120 is located at the side of the waterproof sound-transmitting film 110 away from the external environment and has a ring structure. The adhesive 130 has a ring structure, one side of the adhesive 130 away from the external environment is bonded to the fixing area 112, and the other side is bonded to the support 120. One side of the other adhesive 130 is bonded to the fixing area 112, and the other side is bonded to the shell of the electronic device. The specific structure and related parameters of the waterproof sound-transmitting film 110, the support 120 and the adhesive 130 can be set as in Embodiment 1, and will not be described in detail here. Comparative Example 4

[0071] The waterproof sound-transmitting film assembly of the embodiment comprises a waterproof sound-transmitting film 110 and an adhesive 130. The waterproof sound-transmitting film 110 comprises a sound-transmitting area 111 for waterproof sound transmission and a ring-shaped fixing area 112 located at the edge area of the waterproof sound-transmitting film and surrounding the outside of the sound-transmitting area 111. The adhesive 130 has a ring structure and is arranged on both sides of the waterproof sound-transmitting film 110. One side of the adhesive 130 close to the external environment is bonded to the fixing area 112, and the other side is bonded to the shell of the electronic device. One side of the other adhesive 130 is bonded to the fixing 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-transmitting film 110 and the specific structure of the adhesive 130 can be set as in Embodiment 1, and will not be described in detail here. However, the thickness of the adhesive 130 is greater than that of the adhesive 130 in Embodiment 1, so as to ensure the tightness of the bonding of the adhesive 130 to the waterproof sound-transmitting film 110, the shell and the acoustic component.

[0072] When the waterproof sound permeable membrane 110 is selected as the PTFE sound permeable membrane capable of resisting 2m water pressure (the waterproof sound permeable membrane 110 has a thickness of 10μm and a gas permeation amount of 4s@0.1in² / 100ml), the performance of the waterproof sound permeable membrane 110 of the above-mentioned embodiments one and two and the above-mentioned comparative examples one to four is tested, and the test results are shown in the following table:

[0073] Test Example Sound loss at 1000HZ Sound loss at 5000HZ Sound loss at 6000HZ Sound loss at 9000HZ Example 1 1 dB 0.8 dB 0.6 dB 0.2 dB Example 2 1 dB 0.7 dB 0.4 dB 0.1 dB Comparative Example 1 1.2 dB 1.5 dB 2.2 dB 4 dB Comparative Example 2 1.3 dB 1.9 dB 2.7 dB 4.8 dB Comparative Example 3 1.4 dB 2 dB 2.8 dB 5 dB Comparative Example 4 1.5 dB 2.2 dB 3 dB 5.5 dB

[0074] From the above table, it can be seen that, compared with the above-mentioned comparative examples one to four, the flatness of the waterproof sound permeable membrane 110 is ensured under the synergistic action of the double-sided supporting member 120 and the offset member 140, so that the waterproof sound permeable membrane 110 is not easy to have slight wrinkles, and is not easy to have the phenomenon of local area of the waterproof sound permeable membrane 110 being raised or having corrugation when subjected to certain external force (especially shear external force, transverse shear force), and the sound loss under high frequency is very small; at the same time, the sound loss of each product is basically the same (similar to the above-mentioned embodiment one Figure 5 ), and the audio consistency is good; while in the above-mentioned comparative examples one to four, the sound loss of different products is very different and very scattered (similar to the above-mentioned comparative example four Figure 6 ); and since the membrane is a shallow water membrane, the performance of the samples prepared by the above-mentioned embodiment one and the above-mentioned embodiment two is basically the same.

[0075] When the waterproof sound permeable membrane 110 is selected as the PTFE sound permeable membrane capable of resisting 10m water pressure (the waterproof sound permeable membrane 110 has a thickness of 10μm and a gas permeation amount of 5-7s@1in² / 100ml), the performance of the waterproof sound permeable membrane 110 of the above-mentioned embodiment one and two and the above-mentioned comparative examples one to four is tested again, and the test results are shown in the following table:

[0076] Test Example Sound loss at 1000HZ (unit: dB) Sound loss at 5000HZ (unit: dB) Sound loss at 6000HZ (unit: dB) Sound loss at 9000HZ (unit: dB) Example 1 2 1.5 1 0.6 Example 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

[0077] From the above table, it can be seen that under high water pressure, the double-layer supporting member structure is basically not deformed under the combined action of the offset member 140 and the protective member 150, so as to ensure the audio performance consistency and the low sound loss under high frequency (the above-mentioned embodiment two has obvious progress compared with the above-mentioned embodiment one); that is, after the protective member 150 is added, compared with the structure only having the offset member 140 on one side, the protective effect is better, so that the waterproof sound permeable membrane assembly can withstand higher water pressure and has wider application range. Embodiment three

[0078] As Figure 4 and Figure 7As shown, the embodiment also provides an electronic device, which comprises a shell 200, an acoustic device 300 arranged inside the shell 200, and a waterproof sound-permeable film assembly 100. The waterproof sound-permeable film assembly 100 is the waterproof sound-permeable film assembly 100 described in Embodiment Two, and the acoustic device 300 is a microphone or a loudspeaker, etc. The shell 200 is provided with an opening 210 for propagating sound with the external environment. The waterproof sound-permeable film assembly 100 is bonded to the inner side of the shell 200 through the offset member 140 and covers the opening 210, so as to prevent water from entering the shell 200 from the outside through the opening 210. In this way, the acoustic performance of the electronic device (mainly the electronic device equipped with a microphone) can be improved, which has good sound-permeable performance at various frequencies, small sound loss, and high audio consistency, thereby improving the user experience.

[0079] In order to further ensure the sealing performance of the acoustic device 300 inside the shell 200 (if the sealing performance is poor, it will greatly affect the sound propagation and is prone to sound leakage), the waterproof sound-permeable film assembly 100 in the embodiment further comprises a foam 160. 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 buckles. In this way, the sealing between the protective member 150 and the acoustic device 300 is realized through the foam 160, so as to ensure high-quality sound transmission. During the transmission process, the sound loss is very small, thereby meeting the requirements of actual application. In addition, since the foam 160 is 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, so as to reduce the assembly difficulty and the processing precision requirement, but also can increase the distance between the waterproof sound-permeable film 110 and the acoustic device 300, so as to avoid the rupture of the waterproof sound-permeable film 110 caused by extrusion of the acoustic device 300, thereby prolonging the service life of the waterproof sound-permeable film assembly 100.

[0080] It can be understood that, in other embodiments of the present application, in order to simplify the structure of the waterproof sound-permeable film assembly, the protective member can also be directly bonded and fixed to the acoustic device to realize sealing.

[0081] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the above specific embodiments and the accompanying drawings. Any modification which does not deviate from the functional and structural principles of the present application shall be included in the scope of the claims.

Claims

1. A waterproof acoustically transparent membrane assembly, characterized by: The waterproof sound-permeable film comprises a sound-permeable area for waterproof sound permeation and a ring-shaped fixing area at the edge area of the waterproof sound-permeable film. The support is located on both sides of the waterproof sound-permeable film and has a ring-shaped structure. The adhesive is bonded to the fixing area on one side and to the support on the other side. The adhesive has a ring-shaped structure. The offset member is located on the side of the waterproof sound-permeable film close to the external environment, is connected to the support, and has a ring-shaped structure. The ratio of the thickness of the offset member to the thickness of the adhesive is 1.2-6, and the thickness of the offset member is not less than 0.02 mm. The offset member is a glue member that is bonded to the support.

2. A waterproof acoustically transparent membrane assembly as defined in claim 1, wherein, The glue member comprises a first base material layer and a first glue layer arranged along the thickness direction of the glue member.

3. A waterproof acoustically transparent membrane assembly as defined in claim 2, wherein, The thickness of the support is 0.8-5 times the thickness of the adhesive, and the thickness of the adhesive is 0.01-0.08 mm.

4. A waterproof acoustically transparent membrane assembly as defined in claim 1, wherein, The thickness of the support is 1.2-3 times the thickness of the adhesive.

5. A waterproof acoustically transparent membrane assembly as defined in claim 4, wherein, The waterproof sound-permeable film assembly further comprises a ring-shaped protective member located on the side of the waterproof sound-permeable film away from the external environment and connected to the side of the support away from the waterproof sound-permeable film.

6. A waterproof acoustically transparent membrane assembly as defined in claim 1, wherein, The protective member is a glue member that is bonded to the support, and the thickness of the protective member is greater than the thickness of the adhesive.

7. A waterproof acoustically transparent membrane assembly as defined in claim 6, wherein, The thickness of the waterproof sound-permeable film is 1-50 μm, the average pore size of PMI is 0.05-10 μm, the porosity is 20%-80%, and the water pressure resistance is 1-1000 KPa.

8. A waterproof acoustically transparent membrane assembly as claimed in any one of claims 1 to 7, wherein, The hardness of the support is 20-90 HV0.

1.

9. A waterproof acoustically transparent membrane assembly as claimed in any one of claims 1 to 7, wherein, The support is any one of PET, PE, PP, PI and stainless steel sheet; the hardness of the support is not less than 15HV0.1, the thickness is 0.02-0.2mm, the gram weight is 0.03-0.3g / m 2 , and the surface energy is 20-50mN / m.

10. A waterproof acoustically transparent membrane assembly according to claim 9, wherein, The adhesive comprises a second glue layer and a second base material layer, the second glue layer is located on both sides of the second base material layer, the second base material layer is a PI or PET base material, the thickness of the second glue layer is 5-50 μm, and the ratio of the thickness of the second glue layer to the thickness of the waterproof sound-permeable film is 0.8-2.

11. A waterproof acoustically transparent membrane assembly as claimed in any one of claims 1 to 7, wherein, The waterproof sound-permeable film assembly is the waterproof sound-permeable film assembly of any one of claims 1-11, the shell is provided with an opening for transmitting sound from the external environment, and the waterproof sound-permeable film assembly covers the opening to prevent water from entering the shell from the external environment through the opening. 12.An electronic device comprising a housing, an acoustic device configured inside the housing, and a waterproof acoustically transparent membrane assembly, wherein, ​

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