CN115802238A

CN115802238A - Waterproof sound-transmitting membrane assembly

Info

Publication number: CN115802238A
Application number: CN202211702756.1A
Authority: CN
Inventors: 贾建东; 蔡梁; 庞铁生
Original assignee: Hangzhou Ipro Membrane Technology Co ltd
Current assignee: Hangzhou Ipro Membrane Technology Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-03-14

Abstract

The invention relates to a waterproof sound-transmitting membrane assembly, which comprises a first adhesive piece, a second adhesive piece and a sound-transmitting membrane, wherein the sound-transmitting membrane is adhered between the first adhesive piece and the second adhesive piece, the edge area of the first adhesive piece is adhered to the edge area of the second adhesive piece, the area where the first adhesive piece and the second adhesive piece are directly adhered is an encapsulated area, and the side surface of the sound-transmitting membrane is isolated from the outside through the encapsulated area; the width of the rubber coating area is not less than 10 times of the thickness of the sound transmission film, and the width of the rubber coating area is not more than 25% of the width of the first adhesive piece. According to the technical scheme, the adhesive coating area is arranged, so that the sound-transmitting membrane is not easy to layer, and the bonding strength of the whole structure is improved; secondly, the width of the rubber coating is set to be not less than 10 times of the thickness of the sound-transmitting membrane and not more than 25% of the width of the first bonding piece, so that the air tightness of the waterproof sound-transmitting membrane component is guaranteed, and the waterproof sound-transmitting membrane component has good waterproofness.

Description

Waterproof sound-transmitting membrane assembly

Technical Field

The invention relates to the technical field of waterproof sound-transmitting membranes, in particular to a waterproof sound-transmitting membrane assembly.

Background

Electronic devices such as mobile phones, notebook computers, electronic notebooks, digital cameras, and game devices generally have a sound function. An acoustic emission unit such as a speaker or a buzzer or an acoustic reception unit such as a microphone is disposed inside a casing of an electronic device having an audio function. The casing is provided with an opening at a position corresponding to the sound emitting unit or the sound receiving unit. Sound is transmitted through the opening. In order to prevent foreign matter such as water droplets from entering the inside of the housing, a sound-transmitting film is disposed so as to cover the opening of the housing, and the sound-transmitting film allows sound to pass therethrough and prevents the foreign matter from passing therethrough.

In the related art, a first adhesive member (an adhesive, such as a pressure-sensitive adhesive, the first adhesive member refers to an adhesive member near one side of an external environment), a sound-transmitting membrane and a second adhesive member (an adhesive, such as a pressure-sensitive adhesive, which may be the same adhesive as the first adhesive or different adhesive; in order to ensure that the sound-transmitting membrane has excellent sound-transmitting performance, the sound-transmitting membrane has higher porosity, so that the sound resistance is very small when sound passes through the sound-transmitting membrane, but the cohesion force in the sound-transmitting membrane is easily too small and is smaller than the bonding strength between the sound-transmitting membrane and a bonding piece, so that the sound-transmitting membrane is easy to delaminate in the transfer process; secondly, the sound-transmitting film is a porous material, and has air permeability in the in-plane direction, so that water vapor may flow into the housing, and the air tightness is poor, so that dew condensation may occur in a precision circuit, and electronic equipment may malfunction.

Disclosure of Invention

The invention aims to provide a waterproof sound-transmitting membrane component which can effectively avoid the phenomenon of sound-transmitting membrane delamination and has better air tightness and waterproofness.

In order to achieve the purpose, the invention adopts the following technical scheme: a waterproof sound-transmitting membrane assembly comprises a first adhesive piece, a second adhesive piece and a sound-transmitting membrane, wherein the sound-transmitting membrane is adhered between the first adhesive piece and the second adhesive piece, the edge area of the first adhesive piece is adhered to the edge area of the second adhesive piece, the area where the first adhesive piece and the second adhesive piece are directly adhered is an encapsulated area, and the side surface of the sound-transmitting membrane is isolated from the outside through the encapsulated area;

the width of the rubber coating area is not less than 10 times of the thickness of the sound-transmitting film, and the width of the rubber coating area is not more than 25% of the width of the first adhesive piece.

In the waterproof sound-transmitting membrane assembly provided by the above technical scheme, the first adhesive member is an adhesive member on one side of the membrane assembly close to the external environment, and is an adhesive, such as a pressure-sensitive adhesive, which is the most common, but also other adhesives, the sound-transmitting membrane, and the second adhesive member (an adhesive, such as a pressure-sensitive adhesive, which may be the same adhesive as the first adhesive, or different adhesives); the second adhesive member is an adhesive member on the side of the film assembly facing away from the external environment; the rubber coating area is an area where the first adhesive piece and the second adhesive piece are directly bonded, and the shape of the rubber coating area is preferably annular; by arranging the rubber coating area, the outside of the edge area of the sound-transmitting membrane is bonded by the first bonding piece and the second bonding piece, so that the sound-transmitting membrane is not easy to delaminate in the transfer process of the sound-transmitting membrane assembly (even if the cohesive force in the sound-transmitting membrane is low, delamination is easy, namely the peeling strength of the sound-transmitting membrane is too low), the whole waterproof sound-transmitting membrane assembly is not easy to delaminate, and the bonding strength of the whole structure is improved;

meanwhile, the side face of the sound-transmitting membrane is not in direct contact with the outside by arranging the rubber-coated area, so that external water vapor cannot enter the acoustic equipment through the sound-transmitting membrane, the air tightness is good, the service life of the acoustic equipment is prolonged, and whether the width of the rubber-coated area is larger or not is better (the width of the rubber-coated area is called as rubber-coated width for short, when the rubber-coated area is annular, the width of the rubber-coated area = (the outer diameter of the first adhesive member-the diameter of the membrane)/2), obviously not, but the rubber-coated width is expected to be smaller or smaller, because refinement (miniaturization) is expected more and more along with the development of science and technology, the thickness and the whole area of the whole assembly are not expected to be too large (the area can be considered as the maximum area of the whole assembly in a plan view by overlooking the whole assembly); therefore, the width of the glue coating area is controlled to be not higher than 25% of the width of the first adhesive piece;

the width of the encapsulation area is not smaller or smaller, and obviously not, when the encapsulation area is too small, the phenomenon of delamination of the sound-transmitting membrane still easily occurs, so that the air tightness of the waterproof sound-transmitting membrane component is difficult to ensure; the first adhesive piece and the second adhesive piece can be temporarily adhered under the action of pressure to form an encapsulation area, but the first adhesive piece and the second adhesive piece both have certain rigidity, so that the encapsulation area is difficult to truly realize encapsulation, and a gap is generated on the side surface of the encapsulation area, so that the sound-transmitting membrane is easy to delaminate, and the air tightness of the waterproof sound-transmitting membrane assembly is difficult to ensure; therefore, a glue coating area with a certain width is needed;

in addition, it has been found that in the related art (without the encapsulation region), the whole assembly sometimes generates the phenomenon of helmholtz resonance, that is, the audio frequency is degraded in a specific frequency band, that is, the acoustic resistance is increased; particularly, in a high frequency band with an audio frequency of 10000-20000, the acoustic resistance of the sound-transmitting membrane component is increased obviously sometimes, and the acoustic resistance is too large at the moment, so that the requirement of practical application cannot be met; however, the phenomenon does not disappear or the occurrence probability is obviously reduced due to the existence of the encapsulating area, for example, when the encapsulating width is 4-8 times of the film thickness, although the air tightness of the whole assembly is improved to a certain extent, the Helmholtz resonance phenomenon still has higher probability; however, in a fortuitous accident, the encapsulation width is set to be slightly larger, and we surprisingly find that the probability of the helmholtz resonance phenomenon of the whole assembly is greatly reduced, and through research, we find that when the width of the encapsulation area is not less than 10 times of the thickness of the sound transmission film, the probability of the helmholtz resonance phenomenon of the whole assembly is greatly reduced, that is, the whole assembly has lower acoustic resistance under the frequency of 100-20000, and the requirement of practical application is met.

Preferably, the thickness of the sound-transmitting film is 8 to 30 μm, and the width of the first adhesive member is 0.5 to 3mm.

Setting the thickness of the sound-transmitting membrane to be 10-30 μm, more preferably, the thickness of the sound-transmitting membrane is 10 μm; depending on the thickness of the sound-transmitting membrane and the width of the first adhesive member, a glue-coated zone width of 0.15-0.35mm can be obtained.

When the thickness of the sound-transmitting membrane is more than 30 μm, the obtained encapsulation is too wide, and due to the rigidity of the adhesive part, a large resilience force can be generated, so that the first adhesive part and the second adhesive part are separated, the air tightness of the waterproof sound-transmitting membrane component is difficult to ensure, and the occurrence of the Helmholtz resonance phenomenon is increased; when the thickness of the sound-transmitting membrane is less than 8 mu m, the difficulty is increased for the processing technology, and the sound-transmitting membrane is too soft, so that the waterproof performance is poor;

when the width of the first adhesive piece is more than 3mm, the waterproof sound-transmitting membrane assembly is generally arranged in the groove, so that the installation is difficult, the sound-transmitting area in the middle is too small, and the sound-transmitting performance is poor; when the width of the first adhesive member is less than 0.5mm, the area where the first adhesive member and the second adhesive member are bonded to the sound-transmitting membrane is reduced, so that the waterproof property is lowered.

Preferably, the inner diameter of the first adhesive member is 1.5-2.5mm, and the inner diameter of the first adhesive member is 30-50% of the outer diameter;

the diameter of the sound-transmitting membrane is 1.5-3 times of the inner diameter of the first bonding piece.

The inner diameter of the first bonding piece is set to be 1.5-2.5mm, the inner diameter of the first bonding piece is the size of the sound transmission area, and the inner diameter of the first bonding piece cannot be too large or too small, so that the size of the sound transmission area is ensured, and the waterproof sound transmission membrane assembly has better sound transmission performance; the inner diameter of one adhesive piece is set to be 30-50% of the outer diameter, and the diameter of the sound-transmitting membrane is set to be 1.5-3 times of the inner diameter of the first adhesive piece, so that the width effectiveness of a rubber coating area is ensured, the layering force of the sound-transmitting membrane is enabled to be not easy to occur, the waterproof sound-transmitting membrane assembly has good air tightness, and meanwhile, the bonding area of the two adhesive pieces and the sound-transmitting membrane is also ensured, and the waterproof sound-transmitting membrane assembly has good waterproof performance;

the outer diameter of the first adhesive member can be obtained to be 3.5-5mm according to the inner diameter of the first adhesive member; preferably, the inner diameter of the first adhesive member is 1.5 to 2.0mm; more preferably, the inner diameter of the first adhesive member is 1.6mm, the outer diameter of the first adhesive member is 4.2mm, and the diameter of the sound-transmitting membrane may be 3.6mm depending on the inner diameter of the first adhesive member.

Preferably, the first adhesive member and the second adhesive member are both double-sided tapes, and both comprise a glue layer and a substrate layer arranged along the thickness direction of the first adhesive member and the second adhesive member; the glue layers are positioned on two sides of the base material layer;

the area where the first adhesive piece is adhered to the sound-transmitting membrane is a mucosa area, and in the mucosa area, part of glue in the glue layer permeates into membrane pores of the sound-transmitting membrane to form a permeation area;

the dynamic shear strength of the glue layer is 700-1200kPa, and the displacement of the glue in the glue layer is 0.3-2mm.

The two bonding pieces have the separation tendency due to the rebound of the base material layer, so that the sound-transmitting film and the two bonding pieces have the possibility of layering, the first bonding piece and the second bonding piece are bonded with the sound-transmitting film in a mucosa area, glue in the glue layer can permeate into a film hole of the sound-transmitting film to form a permeation area, the glue permeating into the film hole cannot be too much or too little, and the flowability of the glue is limited through the dynamic shear strength of the glue layer and the displacement of the glue in the glue layer;

the dynamic shear strength is the transverse anti-slip capability; the dynamic shear strength of the glue layer is high, so that the sound-transmitting film fixed by the glue in the glue layer is not easy to shrink, and better audio performance can be provided; when the dynamic shear strength of the glue layer is less than 700kPa and the displacement of the glue in the glue layer is greater than 2mm, the excessive glue in the glue layer permeates into the sound-transmitting membrane, so that the permeation performance of the sound-transmitting membrane is reduced; meanwhile, as excessive glue permeates into the sound transmission film, the weight (gram weight) of the diaphragm is increased, in a high frequency band, the diaphragm mainly transmits sound by means of film vibration, the probability of Helmholtz resonance phenomenon is increased easily by the overweight diaphragm, and the audio frequency is deteriorated in a specific frequency band, namely, the acoustic resistance is increased; particularly, in a high frequency range of audio frequency 10000-20000, the acoustic resistance of the sound-transmitting membrane component is increased obviously sometimes, and the acoustic resistance is too large at the moment, so that the requirement of practical application cannot be met;

when the dynamic shear strength of the glue layer is larger than 1200kPa and the displacement of the glue in the glue layer is smaller than 0.3mm, the glue in the glue layer less penetrates into the sound-transmitting film, and the two bonding pieces can also cause the delamination phenomenon inside the sound-transmitting film when the sound-transmitting film is peeled off; therefore, the dynamic shear strength of the glue layer is 700-1200kPa, and the displacement of the glue in the glue layer is 0.3-2mm, so that a proper amount of glue in the glue layer permeates into the membrane holes of the sound-transmitting membrane, the permeation performance of the sound-transmitting membrane can be ensured, and the phenomenon of layering can be effectively avoided. And we found that, surprisingly, the occurrence probability of the helmholtz resonance phenomenon is not increased basically when a proper amount of glue permeates into the sound-transmitting membrane, that is, the membrane has good sound-transmitting performance in various frequency bands.

Preferably, the thickness of the glue layer is 20-60um, and the ratio of the thickness of the substrate layer to the thickness of the glue layer is 0.4-0.7; and/or

The average thickness of the penetration zone is 4-15um, and the average thickness of the penetration zone is not less than 50% of the film thickness; and/or

The average width of the permeable area is 0.4-3mm, and the average width of the permeable area is 75% -100% of the width of the first adhesive member.

The thickness of the glue layer is set to be 20-60um, the ratio of the thickness of the substrate layer to the thickness of the glue layer is set to be 0.4-0.7, the bonding area of glue can be effectively ensured, and the bonding strength is further ensured; when the thickness of the glue layer is more than 60um and the ratio of the thickness of the substrate layer to the thickness of the glue layer is less than 0.4, the glue in the glue layer can easily permeate into the sound-transmitting membrane, so that the permeability of the sound-transmitting membrane is reduced, the glue layer is too thick, the rigidity of the substrate layer cannot be ensured, the integral structure of the two bonding pieces is too soft, and the difficulty in mounting is brought; thickness when glue layer is less than 20um, when the thickness of substrate layer is greater than 0.7 with the thickness ratio of glue layer, glue layer is too thin, and the substrate layer is too stiff, two upper and lower bonding pieces bonding back, two bonding pieces can produce deformation, the substrate layer of deformation has the resilience trend, this just makes two bonding pieces have the trend of separation, and then make sound-permeable membrane and two bonding pieces have the possibility of layering, when two bonding pieces peel off sound-permeable membrane simultaneously, still can make the inside layering phenomenon that produces of sound-permeable membrane, make overall structure's bond strength greatly reduced.

The average thickness of the permeable zone is 4-15um, and the average width of the permeable zone is 0.4-3mm, so that a proper amount of glue in the glue layer permeates into membrane pores of the sound-transmitting membrane, the permeability of the sound-transmitting membrane can be ensured, and the phenomenon of layering can be effectively avoided. The mean thickness of the permeable area is not less than 50% of the thickness of the membrane, and the mean width of the permeable area is 75% -100% of the width of the first adhesive member, so that when the two adhesive members are peeled off from the sound-transmitting membrane, the phenomenon of delamination inside the sound-transmitting membrane is further avoided.

Preferably, the elastic modulus of the base material layer is 50-300MPa, the deformation at the elastic limit of the base material layer is 0.5% -5%, and the Vickers hardness of the base material layer is 40-70HV;

the adhesive strength of the glue layer is 5N/25mm-30N/25mm.

The resilience value of the adhesive piece is determined by the performance of the base material layer, in order to enable the first adhesive piece and the second adhesive piece to have adaptive resilience values, the elastic modulus of the base material layer is 50-300MPa, the elastic limit deformation of the base material layer is 0.5-5%, and the Vickers hardness of the base material layer is 40-70HV, so that the base material layer cannot generate overlarge resilience, the adhesive piece has good bonding strength, and the waterproof sound-transmitting membrane assembly is effectively prevented from being layered; when the vickers hardness of the base material layer is less than 40HV, the first adhesive member and the second adhesive member are made soft, thereby reducing the mechanical strength of the entire waterproof sound-transmitting membrane assembly. At the same time we have found

When the substrate layer has a suitable elastic modulus (i.e., the first adhesive member and the second adhesive member have suitable rigidity), the entire sound-transmitting membrane module also has good sound-transmitting properties, while it is easier to reduce the occurrence probability of the helmholtz resonance phenomenon, and good sound-transmitting properties in various frequency bands.

Preferably, the difference between the surface energy of the outer surface of the sound-transmitting membrane and the surface tension of the glue layer is 5-15mN/m;

the surface roughness of the sound-transmitting membrane is Ra =0.15um-0.55um.

The difference between the surface energy of the outer surface of the sound-transmitting membrane and the surface tension of the glue layer is set to be 5-15mN/m, so that the adhesive piece and the sound-transmitting membrane are firmly bonded, and the mobility of the glue layer of the adhesive piece on the sound-transmitting membrane is not too high; the surface roughness of the surface of the sound-transmitting film is Ra =0.15um-0.55um, the bonded surface area is larger, the bonding between the sound-transmitting film and the glue layer of the bonding piece is firmer, and meanwhile, the mobility of the glue layer of the bonding piece on the sound-transmitting film is not too large; when the surface roughness of the sound-transmitting film is less than 0.15um, the sound-transmitting film and the glue layer of the adhesive piece are not tightly adhered, so that the adhesive is easy to be degummed or air leakage; when the surface roughness of the sound-transmitting membrane is greater than 0.55um, the fluidity of the glue layer on the sound-transmitting membrane is also deteriorated, and the glue of the glue layer is difficult to be in the sound-transmitting membrane.

Preferably, the surface energy of the outer surface of the sound-transmitting membrane is 20-35mN/m, and the surface tension of the glue layer is 10-20mN/m.

Setting the surface energy of the outer surface of the sound-transmitting membrane to be 20-35mN/m, wherein the surface energy of the outer surface of the sound-transmitting membrane cannot be too high or too low, and when the surface energy of the outer surface of the sound-transmitting membrane is higher than 35mN/m, the water-proof and oil-proof performance of the sound-transmitting membrane to the outside is difficult to guarantee, and meanwhile, glue in a glue layer is easy to permeate into a sound-transmitting area of the sound-transmitting membrane; when the surface energy of the outer surface of the sound-transmitting film is lower than 20mN/m, glue in the glue layer is difficult to permeate into the sound-transmitting film, and the sound-transmitting film is likely to have a layering phenomenon under the influence of resilience of the base material layer; the surface tension of the glue layer is set to be 10-20mN/m, so that the glue in the glue layer can permeate into the sound-transmitting membrane in a proper amount, and the phenomenon of layering of the sound-transmitting membrane is further effectively avoided.

Preferably, the aperture of the sound-transmitting membrane is 0.1-10um, the porosity of the sound-transmitting membrane is 30-70%, the diameter of the sound-transmitting membrane is 1-5mm, and the gram weight of the sound-transmitting membrane is 3-12g/m < 2 >.

The aperture of the sound-transmitting membrane is set to be 0.1-10um, the porosity of the sound-transmitting membrane is set to be 30-70%, the diameter of the sound-transmitting membrane is set to be 1-5mm, the gram weight of the sound-transmitting membrane is set to be 3-12g/m < 2 >, and the purpose is to effectively ensure the permeability of the sound-transmitting membrane and enable glue in a glue layer to permeate into the sound-transmitting membrane in a proper amount. Suitable membrane material not only can guarantee that whole sound-transmitting membrane subassembly has good sound transmission performance, more is favorable to reducing the emergence probability of helmholtz resonance phenomenon, and in the high frequency channel that the audio frequency is 10000-20000, sound-transmitting membrane subassembly's acoustic resistance is still less, can not take place the sudden change, further satisfies practical application's demand.

Preferably, the sound-transmitting membrane is any one of a nylon membrane, a polyethylene membrane, a polypropylene membrane, a polytetrafluoroethylene membrane and a polyimide membrane;

the water pressure resistance of the waterproof sound-transmitting membrane component is more than 20KPa;

the sound blocking amount of the waterproof sound-transmitting membrane component is less than 2dB @100-20000Hz.

The sound-transmitting membrane is selected from any one of a nylon membrane, a polyethylene membrane, a polypropylene membrane, a polytetrafluoroethylene membrane and a polyimide membrane, and firstly, the mechanical strength is high, so that the whole waterproof sound-transmitting membrane assembly can have good strength, and the requirements of practical application can be met; and secondly, the polytetrafluoroethylene film can resist high temperature and has stable chemical properties, for example, the polytetrafluoroethylene film can resist acid, alkali and acid and has stable performance. The water pressure resistance of the waterproof sound-transmitting membrane component is more than 20KPa, so that the waterproofness of the waterproof sound-transmitting membrane component is effectively ensured, and the waterproof sound-transmitting membrane component has better air tightness.

As the MEMS on the PCB needs to be subjected to audio test, the sound blocking quantity of the waterproof sound-transmitting membrane assembly is preferably less than 2dB @100-20000Hz, so that the waterproof sound-transmitting membrane assembly has better sound transmission when the MEMS is subjected to audio test.

Compared with the prior art, the invention has the beneficial effects that:

according to the waterproof sound-transmitting membrane assembly provided by the technical scheme, the rubber-coated area is arranged, and the edge area of the sound-transmitting membrane is bonded by the first bonding piece and the second bonding piece, so that the peeling strength of the sound-transmitting membrane is low, the sound-transmitting membrane is not easy to delaminate, the whole waterproof sound-transmitting membrane assembly is not easy to delaminate, and the bonding strength of the whole structure is improved; secondly, the structure in the related art has poor air tightness, the phenomenon of Helmholtz resonance can occur, and the audio frequency is deteriorated in a specific frequency band, namely the acoustic resistance is increased; the width of the rubber coating is set to be not less than 10 times of the thickness of the sound-transmitting membrane and not more than 25% of the width of the first bonding piece, so that the air tightness of the waterproof sound-transmitting membrane component is guaranteed, and the waterproof sound-transmitting membrane component has good waterproofness.

Drawings

FIG. 1 is a schematic cross-sectional view of a waterproof sound-transmitting membrane assembly according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an alternative perspective of a waterproof sound-permeable membrane assembly according to an embodiment of the present invention;

FIG. 3 is a schematic view of the first adhesive member of FIG. 1;

FIG. 4 is a schematic view of the sound-permeable membrane of FIG. 1;

FIG. 5 is an internal schematic view of the first adhesive member of FIG. 3;

FIG. 6 is a schematic diagram of a testing apparatus for dynamic shear force of pressure sensitive adhesive according to an embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of a waterproof sound-transmitting membrane module according to a second comparative example of the present invention;

FIG. 8 is a schematic sectional view of a waterproof sound-transmitting membrane assembly according to a third comparative example of the present invention;

fig. 9 is an enlarged schematic view of a point a shown in fig. 1.

Description of reference numerals:

1. a first adhesive member; 11. a substrate layer; 12. a glue layer; 2. a second adhesive member; 3. an acoustically transparent membrane; 31. a permeable zone; 4. a glue coating area; 51. an aluminum plate; 52. and (6) gluing.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 9, in an embodiment of the present invention, a waterproof sound-transmitting membrane assembly is provided, a dynamic shear strength of the glue layer 12 is 700 to 1200kPa, and a displacement of the glue in the glue layer 12 is 0.3 to 2mm. The test method comprises the following steps: as shown in fig. 6, first, two 100mm by 20mm aluminum plates 51 were prepared as test plate materials, and the samples were cut to 20mm by 20mm; secondly, the adhesive 52 is attached between the two aluminum plates 51, as shown in the figure, the attaching treatment is further performed, 10 kg of pressure is applied to the aluminum plates 51, and the pressure is released after being maintained for 5min; then, standing for 5min; fourthly, connecting the device to a tensile testing machine, wherein the testing speed is 50mm/min; fifth, the maximum force (N) and shear strength (KPa) at which the glue 52 fails are recorded and the raw data of the force-displacement diagram is saved.

The dynamic shear strength is measured, and if the dynamic shear strength is high, the fluidity is low; the tensile testing machine automatically records data, the displacement of the glue in the glue layer 12 is 0.3-2mm (namely the loading force of the tensile testing machine has a maximum value and a point of unloading force, the displacement of the two points is automatically recorded by the tensile testing machine and is called as the maximum force point displacement)

Example 1

The present embodiment provides a waterproof sound-transmitting membrane 3 assembly comprising a first adhesive member 1, a second adhesive member 2 and a sound-transmitting membrane 3. The water pressure resistance of the waterproof sound-transmitting membrane 3 component is 25KPa; the sound blocking amount of the waterproof sound-transmitting membrane 3 component is 1.5dB @100-10000Hz. The first adhesive member 1 and the second adhesive member 2 may be the same, and the structure, performance parameters, etc. of the second adhesive member 2 will not be described in detail below.

The sound-transmitting membrane 3 is bonded between the first adhesive member 1 and the second adhesive member 2, the first adhesive member 1 and the second adhesive member 2 are both in a ring shape, and the width of the first adhesive member 1 is equal to that of the second adhesive member 2; the first adhesive piece 1 and the second adhesive piece 2 are both double-sided adhesive tapes and respectively comprise a glue layer 12 and a base material layer 11 which are arranged along the thickness direction of the double-sided adhesive tapes; the glue layer 12 is positioned on two sides of the base material layer 11; the edge area of the first adhesive member 1 is bonded to the second adhesive member 2 through the glue layer 12; and a part of the glue in the glue layer 12 penetrates into the membrane pores of the sound-transmitting membrane 3.

The dynamic shear strength of the glue layer 12 is 700kPa, and the displacement of the glue in the glue layer 12 is 2mm; the thickness of the glue layer 12 is 20um, and the ratio of the thickness of the substrate layer 11 to the thickness of the glue layer 12 is 0.4; the cohesive strength of the glue layer 12 was 5N/25mm.

The elastic modulus of the substrate layer 11 is 300MPa, the elastic limit deformation of the substrate layer 11 is 5%, and the Vickers hardness of the substrate layer 11 is 40HV;

the width of the first adhesive member 1 is 3mm, the inner diameter of the first adhesive member 1 is 1.5mm, and the inner diameter of the first adhesive member 1 is 30% of the outer diameter.

The area where the first adhesive member is bonded to the acoustically transparent membrane is the mucosal area where a portion of the glue in the glue layer penetrates into the pores of the acoustically transparent membrane to form a permeable region 31. The average thickness of infiltration zone 31 is 4um, the average width of infiltration zone 31 is 2.25mm.

The sound-transmitting membrane 3 is a nylon membrane, the diameter of the sound-transmitting membrane 3 is 3 times of the inner diameter of the first adhesive piece 1, the thickness of the sound-transmitting membrane 3 is 8 mu m, the surface roughness of the sound-transmitting membrane 3 is Ra =0.15um, and 3 holes of the sound-transmitting membraneThe diameter is 0.1um, the porosity of the sound-transmitting film 3 is 30 percent, the diameter of the sound-transmitting film 3 is 4.5mm, and the gram weight of the sound-transmitting film 3 is 10g/m ² (ii) a The difference between the surface energy of the outer surface of the sound-transmitting membrane 3 and the surface tension of the glue layer 12 is 15mN/m; the surface energy of the outer surface of the sound-transmitting membrane 3 is 25mN/m, and the surface tension of the glue layer 12 is 10mN/m.

The edge area of the first adhesive member 1 is bonded with the edge area of the second adhesive member 2, the area where the first adhesive member 1 and the second adhesive member 2 are bonded is an encapsulated area 4, the encapsulated area 4 is annular, the width of the encapsulated area 4 is 20 times of the thickness of the sound-transmitting membrane 3, and the width of the encapsulated area 4 is 12% of the width of the first adhesive member 1.

Example 2

The present embodiment provides a waterproof sound-transmitting membrane 3 assembly comprising a first adhesive member 1, a second adhesive member 2 and a sound-transmitting membrane 3. The water pressure resistance of the waterproof sound-transmitting membrane 3 component is 30KPa; the sound blocking amount of the waterproof sound-transmitting membrane 3 component is 1dB @100-10000Hz.

The dynamic shear strength of the glue layer 12 is 1200kPa, and the displacement of the glue in the glue layer 12 is 0.3mm; the thickness of the glue layer 12 is 60um, and the ratio of the thickness of the substrate layer 11 to the thickness of the glue layer 12 is 0.7; the cohesive strength of the glue layer 12 was 30N/25mm.

The elastic modulus of the substrate layer 11 is 50MPa, the deformation at the limit of elasticity of the substrate layer 11 is 0.5%, and the Vickers hardness of the substrate layer 11 is 70HV;

the width of the first adhesive member 1 is 0.5mm, the inner diameter of the first adhesive member 1 is 2.5mm, and the inner diameter of the first adhesive member 1 is 50% of the outer diameter.

The area where the first adhesive member is bonded to the acoustically transparent membrane is the mucosal area where a portion of the glue in the glue layer penetrates into the pores of the acoustically transparent membrane to form a permeable region 31. The average thickness of infiltration zone 31 is 15um, the average width of infiltration zone 31 is 0.5mm.

The sound-transmitting membrane 3 is a polyethylene membrane, the diameter of the sound-transmitting membrane 3 is 1.5 times of the inner diameter of the first adhesive member 1, the thickness of the sound-transmitting membrane 3 is 30 μm, the surface roughness of the sound-transmitting membrane 3 is Ra =0.55um, the aperture of the sound-transmitting membrane 3 is 10um, the porosity of the sound-transmitting membrane 3 is 70%, the diameter of the sound-transmitting membrane 3 is 3.75mm, and the gram weight of the sound-transmitting membrane 3 is 8g/m ² (ii) a The difference between the surface energy of the outer surface of the sound-transmitting membrane 3 and the surface tension of the glue layer 12 is 5mN/m; the surface energy of the outer surface of the sound-transmitting film 3 is 25mN/m, and the surface tension of the glue layer 12 is 20mN/m.

The edge area of the first adhesive member 1 is bonded with the edge area of the second adhesive member 2, the area where the first adhesive member 1 and the second adhesive member 2 are bonded is an encapsulated area 4, the encapsulated area 4 is annular, the width of the encapsulated area 4 is 10 times of the thickness of the sound-transmitting membrane 3, and the width of the encapsulated area 4 is 25% of the width of the first adhesive member 1.

Example 3

The present embodiment provides a waterproof sound-transmitting membrane 3 assembly comprising a first adhesive member 1, a second adhesive member 2 and a sound-transmitting membrane 3. The water pressure resistance of the waterproof sound-transmitting membrane 3 component is 33KPa; the sound blocking amount of the waterproof sound-transmitting membrane 3 component is 0.8dB @100-10000Hz.

The dynamic shear strength of the glue layer 12 is 1000kPa, and the displacement of the glue in the glue layer 12 is 1.2mm; the thickness of the glue layer 12 is 50um, and the ratio of the thickness of the substrate layer 11 to the thickness of the glue layer 12 is 0.6; the cohesive strength of the glue layer 12 was 25N/25mm.

The elastic modulus of the substrate layer 11 is 250MPa, the deformation at the limit of elasticity of the substrate layer 11 is 4%, and the Vickers hardness of the substrate layer 11 is 60HV;

the width of the first adhesive member 1 is 2.5mm, the inner diameter of the first adhesive member 1 is 2mm, and the inner diameter of the first adhesive member 1 is 40% of the outer diameter.

The area where the first adhesive member is bonded to the acoustically transparent membrane is the mucosal area where a portion of the glue in the glue layer penetrates into the pores of the acoustically transparent membrane to form a permeable region 31. The average thickness of infiltration zone 31 is 6um, the average width of infiltration zone 31 is 2.5mm.

The sound-transmitting membrane 3 is a polypropylene membrane, the diameter of the sound-transmitting membrane 3 is 2 times of the inner diameter of the first adhesive member 1, the thickness of the sound-transmitting membrane 3 is 10 micrometers, the surface roughness of the sound-transmitting membrane 3 is Ra =0.35um, the pore diameter of the sound-transmitting membrane 3 is 5um, the porosity of the sound-transmitting membrane 3 is 50%, the diameter of the sound-transmitting membrane 3 is 4mm, and the gram weight of the sound-transmitting membrane 3 is 9g/m2; the difference between the surface energy of the outer surface of the sound-transmitting membrane 3 and the surface tension of the glue layer 12 is 10mN/m; the surface energy of the outer surface of the sound-transmitting membrane 3 is 20mN/m, and the surface tension of the glue layer 12 is 10mN/m.

The edge area of the first adhesive member 1 is bonded with the edge area of the second adhesive member 2, the area where the first adhesive member 1 and the second adhesive member 2 are bonded is an encapsulated area 4, the encapsulated area 4 is annular, the width of the encapsulated area 4 is 15 times the thickness of the sound-transmitting membrane 3, and the width of the encapsulated area 4 is 14% of the width of the first adhesive member 1.

Example 4

The present embodiment provides a waterproof sound-transmitting membrane 3 assembly comprising a first adhesive member 1, a second adhesive member 2 and a sound-transmitting membrane 3. The water pressure resistance of the waterproof sound-transmitting membrane 3 component is 35KPa; the sound blocking amount of the waterproof sound-transmitting membrane 3 component is 1.2dB @100-10000Hz.

The sound-transmitting membrane 3 is bonded between the first bonding piece 1 and the second bonding piece 2, the first bonding piece 1 and the second bonding piece 2 are both annular, and the width of the first bonding piece 1 is equal to that of the second bonding piece 2; the first adhesive piece 1 and the second adhesive piece 2 are both double-sided adhesive tapes and respectively comprise a glue layer 12 and a base material layer 11 which are arranged along the thickness direction of the double-sided adhesive tapes; the glue layer 12 is positioned on two sides of the base material layer 11; the edge area of the first adhesive member 1 is bonded to the second adhesive member 2 through the glue layer 12; and a part of the glue in the glue layer 12 penetrates into the membrane pores of the sound-transmitting membrane 3.

The dynamic shear strength of the glue layer 12 is 800kPa, and the displacement of the glue in the glue layer 12 is 1.8mm; the thickness of the glue layer 12 is 40um, and the ratio of the thickness of the substrate layer 11 to the thickness of the glue layer 12 is 0.6; the cohesive strength of the glue layer 12 was 20N/25mm.

The elastic modulus of the substrate layer 11 is 200MPa, the deformation at the limit of elasticity of the substrate layer 11 is 3.5%, and the Vickers hardness of the substrate layer 11 is 50HV;

the width of the first adhesive member 1 is 0.8mm, the inner diameter of the first adhesive member 1 is 1.8mm, and the inner diameter of the first adhesive member 1 is 35% of the outer diameter.

The area where the first adhesive member is bonded to the acoustically transparent membrane is the mucosal area where a portion of the glue in the glue layer penetrates into the pores of the acoustically transparent membrane to form a permeable region 31. The average thickness of infiltration zone 31 is 15um, the average width of infiltration zone 31 is 0.72mm.

The sound-transmitting membrane 3 is a polytetrafluoroethylene membrane, the diameter of the sound-transmitting membrane 3 is 2 times of the inner diameter of the first adhesive part 1, the thickness of the sound-transmitting membrane 3 is 25 micrometers, the surface roughness of the sound-transmitting membrane 3 is Ra =0.4 micrometers, the aperture of the sound-transmitting membrane 3 is 8 micrometers, the porosity of the sound-transmitting membrane 3 is 60%, the diameter of the sound-transmitting membrane 3 is 3.6mm, and the grammage of the sound-transmitting membrane 3 is 7.5g/m2; the difference between the surface energy of the outer surface of the sound-transmitting membrane 3 and the surface tension of the glue layer 12 is 15mN/m; the surface energy of the outer surface of the sound-transmitting membrane 3 is 35mN/m, and the surface tension of the glue layer 12 is 20mN/m.

The edge area of the first adhesive member 1 is bonded with the edge area of the second adhesive member 2, the area where the first adhesive member 1 and the second adhesive member 2 are bonded is an encapsulated area 4, the encapsulated area 4 is annular, the width of the encapsulated area 4 is 10 times the thickness of the sound-transmitting membrane 3, and the width of the encapsulated area 4 is 22% of the width of the first adhesive member 1.

Example 5

The present embodiment provides a waterproof sound-transmitting membrane 3 assembly comprising a first adhesive member 1, a second adhesive member 2 and a sound-transmitting membrane 3. The water pressure resistance of the waterproof sound-transmitting membrane 3 component is 40KPa; the sound blocking amount of the waterproof sound-transmitting membrane 3 component is 1.8dB @100-10000Hz.

The dynamic shear strength of the glue layer 12 is 900kPa, and the displacement of the glue in the glue layer 12 is 1.5mm; the thickness of the glue layer 12 is 35um, and the ratio of the thickness of the substrate layer 11 to the thickness of the glue layer 12 is 0.48; the cohesive strength of the glue layer 12 was 18N/25mm.

The elastic modulus of the substrate layer 11 is 150MPa, the deformation at the limit of elasticity of the substrate layer 11 is 3%, and the Vickers hardness of the substrate layer 11 is 45HV;

the width of the first adhesive member 1 is 2mm, the inner diameter of the first adhesive member 1 is 2.2mm, and the inner diameter of the first adhesive member 1 is 45% of the outer diameter.

The area where the first adhesive member is bonded to the acoustically transparent membrane is the mucosal area where a portion of the glue in the glue layer penetrates into the pores of the acoustically transparent membrane to form a permeable region 31. The average thickness of infiltration zone 31 is 7.5um, the average width of infiltration zone 31 is 1.6mm.

The sound-transmitting membrane 3 is a polyimide membrane, the diameter of the sound-transmitting membrane 3 is 1.5 times of the inner diameter of the first adhesive member 1, the thickness of the sound-transmitting membrane 3 is 15 micrometers, the surface roughness of the sound-transmitting membrane 3 is Ra =0.3um, the pore diameter of the sound-transmitting membrane 3 is 7um, the porosity of the sound-transmitting membrane 3 is 55%, the diameter of the sound-transmitting membrane 3 is 3.3mm, and the grammage of the sound-transmitting membrane 3 is 7g/m2; the difference between the surface energy of the outer surface of the sound-transmitting membrane 3 and the surface tension of the glue layer 12 is 5mN/m; the surface energy of the outer surface of the sound-transmitting membrane 3 is 20mN/m, and the surface tension of the glue layer 12 is 15mN/m.

The edge area of the first adhesive member 1 is bonded with the edge area of the second adhesive member 2, the area where the first adhesive member 1 and the second adhesive member 2 are bonded is an encapsulated area 4, the encapsulated area 4 is annular, the width of the encapsulated area 4 is 20 times of the thickness of the sound-transmitting membrane 3, and the width of the encapsulated area 4 is 16% of the width of the first adhesive member 1.

Example 6

The dynamic shear strength of the glue layer 12 is 1100kPa, and the displacement of the glue in the glue layer 12 is 0.8mm; the thickness of the glue layer 12 is 30um, and the ratio of the thickness of the substrate layer 11 to the thickness of the glue layer 12 is 0.45; the adhesive strength of the glue layer 12 was 12N/25mm.

The elastic modulus of the substrate layer 11 is 245MPa, the elastic limit deformation of the substrate layer 11 is 4%, and the Vickers hardness of the substrate layer 11 is 60HV;

the width of the first adhesive member 1 is 1.5mm, the inner diameter of the first adhesive member 1 is 2.5mm, and the inner diameter of the first adhesive member 1 is 48% of the outer diameter.

The area where the first adhesive member is bonded to the acoustically transparent membrane is the mucosal area where a portion of the glue in the glue layer penetrates into the pores of the acoustically transparent membrane to form a permeable region 31. The average thickness of infiltration zone 31 is 10um, the average width of infiltration zone 31 is 1.5mm.

The sound-transmitting membrane 3 is a nylon membrane, the diameter of the sound-transmitting membrane 3 is 1.8 times of the inner diameter of the first adhesive member 1, the thickness of the sound-transmitting membrane 3 is 20 μm, the surface roughness of the sound-transmitting membrane 3 is Ra =0.5um, the aperture of the sound-transmitting membrane 3 is 4um, the porosity of the sound-transmitting membrane 3 is 40%, the diameter of the sound-transmitting membrane 3 is 4.5mm, and the gram weight of the sound-transmitting membrane 3 is 12g/m ² (ii) a The difference between the surface energy of the outer surface of the sound-transmitting membrane 3 and the surface tension of the glue layer 12 is 10mN/m; the surface energy of the outer surface of the sound-transmitting film 3 is 30mN/m, and the surface tension of the glue layer 12 is 20mN/m.

The edge area of the first adhesive member 1 is bonded with the edge area of the second adhesive member 2, the area where the first adhesive member 1 and the second adhesive member 2 are bonded is an encapsulated area 4, the encapsulated area 4 is annular, the width of the encapsulated area 4 is 10 times of the thickness of the sound-transmitting membrane 3, and the width of the encapsulated area 4 is 20% of the width of the first adhesive member 1.

Example 7

The dynamic shear strength of the glue layer 12 is 1000kPa, and the displacement of the glue in the glue layer 12 is 1.2mm; the thickness of the glue layer 12 is 60um, and the ratio of the thickness of the substrate layer 11 to the thickness of the glue layer 12 is 0.7; the cohesive strength of the glue layer 12 was 30N/25mm.

The elastic modulus of the substrate layer 11 is 190MPa, the deformation at the limit of elasticity of the substrate layer 11 is 3.8%, and the Vickers hardness of the substrate layer 11 is 50HV;

the width of the first adhesive member 1 is 3mm, the inner diameter of the first adhesive member 1 is 1.5mm, and the inner diameter of the first adhesive member 1 is 33% of the outer diameter.

The area where the first adhesive member is bonded to the acoustically transparent membrane is the mucosal area where a portion of the glue in the glue layer penetrates into the pores of the acoustically transparent membrane to form a permeable region 31. The average thickness of infiltration zone 31 is 7.2um, the average width of infiltration zone 31 is 2.25mm.

The sound-transmitting membrane 3 is a polyimide membrane, the diameter of the sound-transmitting membrane 3 is 3 times of the inner diameter of the first adhesive member 1, the thickness of the sound-transmitting membrane 3 is 8 micrometers, the surface roughness of the sound-transmitting membrane 3 is Ra =0.25um, the pore diameter of the sound-transmitting membrane 3 is 5um, the porosity of the sound-transmitting membrane 3 is 50%, the diameter of the sound-transmitting membrane 3 is 4.5mm, and the gram weight of the sound-transmitting membrane 3 is 11g/m2; the difference between the surface energy of the outer surface of the sound-transmitting membrane 3 and the surface tension of the glue layer 12 is 15mN/m; the surface energy of the outer surface of the sound-transmitting membrane 3 is 25mN/m, and the surface tension of the glue layer 12 is 10mN/m.

The edge area of the first adhesive member 1 is bonded with the edge area of the second adhesive member 2, the area where the first adhesive member 1 and the second adhesive member 2 are bonded is an encapsulated area 4, the encapsulated area 4 is annular, the width of the encapsulated area 4 is 10 times of the thickness of the sound-transmitting membrane 3, and the width of the encapsulated area 4 is 12% of the width of the first adhesive member 1.

Comparative example 1

In this comparative example, there is provided a waterproof sound-transmitting membrane 3 assembly comprising a first adhesive member 1, a second adhesive member 2 and a sound-transmitting membrane 3. The water pressure resistance of the waterproof sound-transmitting membrane 3 component is 25KPa; the sound blocking amount of the waterproof sound-transmitting membrane 3 component is 1.5dB @100-10000Hz. The first adhesive member 1 and the second adhesive member 2 may be the same, and the structure, performance parameters, etc. of the second adhesive member 2 will not be described in detail below.

The elastic modulus of the substrate layer 11 is 300MPa, the deformation at the elastic limit of the substrate layer 11 is 5%, and the Vickers hardness of the substrate layer 11 is 40HV;

The area where the first adhesive member is bonded to the acoustically transparent membrane is the mucosal area where a portion of the glue in the glue layer penetrates into the pores of the acoustically transparent membrane to form a permeable region 31. The average thickness of infiltration zone 31 is 7.2um, the average width of infiltration zone 31 is 3mm.

The sound-transmitting membrane 3 is a nylon membrane, the diameter of the sound-transmitting membrane 3 is 3 times of the inner diameter of the first adhesive member 1, the thickness of the sound-transmitting membrane 3 is 8 micrometers, the surface roughness of the sound-transmitting membrane 3 is Ra =0.15um, the pore diameter of the sound-transmitting membrane 3 is 0.1um, the porosity of the sound-transmitting membrane 3 is 30%, the diameter of the sound-transmitting membrane 3 is 4.5mm, and the gram weight of the sound-transmitting membrane 3 is 10g/m2; the difference between the surface energy of the outer surface of the sound-transmitting membrane 3 and the surface tension of the glue layer 12 is 15mN/m; the surface energy of the outer surface of the sound-transmitting membrane 3 is 25mN/m, and the surface tension of the glue layer 12 is 10mN/m.

The edge area of the first adhesive member 1 is bonded with the edge area of the second adhesive member 2, the area where the first adhesive member 1 and the second adhesive member 2 are bonded is an encapsulated area 4, the encapsulated area 4 is annular, the width of the encapsulated area 4 is 20 times of the thickness of the sound-transmitting membrane 3, and the width of the encapsulated area 4 is 30% of the width of the first adhesive member 1.

Comparative example 2

As shown in fig. 7, the present comparative example provides a waterproof sound-transmitting membrane 3 assembly comprising a first adhesive member 1, a second adhesive member 2 and a sound-transmitting membrane 3. The water pressure resistance of the waterproof sound-transmitting membrane 3 component is 30KPa; the sound blocking amount of the waterproof sound-transmitting membrane 3 component is 1dB @100-10000Hz.

The dynamic shear strength of the glue layer 12 is 1200kPa, and the displacement of the glue in the glue layer 12 is 0.3mm; the thickness of the glue layer 12 is 60um, and the ratio of the thickness of the substrate layer 11 to the thickness of the glue layer 12 is 0.7; the adhesive strength of the glue layer 12 is 30N/25mm.

the width of the first adhesive member 1 is 2.5mm, the inner diameter of the first adhesive member 1 is 2.5mm, and the inner diameter of the first adhesive member 1 is 50% of the outer diameter.

The area where the first adhesive means is bonded to the acoustically transparent membrane is the mucosal area where part of the glue in the glue layer penetrates into the membrane pores of the acoustically transparent membrane to form the permeable area 31. The average thickness of infiltration zone 31 is 15um, the average width of infiltration zone 31 is 2.5mm.

The sound-transmitting membrane 3 is a polyethylene membrane, the diameter of the sound-transmitting membrane 3 is 1.5 times of the inner diameter of the first adhesive member 1, the thickness of the sound-transmitting membrane 3 is 30 μm, the surface roughness of the sound-transmitting membrane 3 is Ra =0.55um, the pore diameter of the sound-transmitting membrane 3 is 10um, the porosity of the sound-transmitting membrane 3 is 70%, the diameter of the sound-transmitting membrane 3 is 3.75mm, and the grammage of the sound-transmitting membrane 3 is 8g/m2; the difference between the surface energy of the outer surface of the sound-transmitting membrane 3 and the surface tension of the glue layer 12 is 5mN/m; the surface energy of the outer surface of the sound-transmitting membrane 3 is 25mN/m, and the surface tension of the glue layer 12 is 20mN/m.

The edge area of the first adhesive member 1 is bonded with the edge area of the second adhesive member 2, the area where the first adhesive member 1 and the second adhesive member 2 are bonded is an encapsulated area 4, the encapsulated area 4 is annular, the width of the encapsulated area 4 is 3 times the thickness of the sound-transmitting membrane 3, and the width of the encapsulated area 4 is 14% of the width of the first adhesive member 1.

Comparative example 3

As shown in fig. 8, the present comparative example provides a waterproof sound-transmitting membrane 3 assembly comprising a first adhesive member 1, a second adhesive member 2 and a sound-transmitting membrane 3. The water pressure resistance of the waterproof sound-transmitting membrane 3 component is 33KPa; the sound blocking amount of the waterproof sound-transmitting membrane 3 component is 0.8dB @100-10000Hz.

The sound-transmitting membrane 3 is bonded between the first adhesive member 1 and the second adhesive member 2, the first adhesive member 1 and the second adhesive member 2 are both annular, and the width of the first adhesive member 1 is equal to that of the second adhesive member 2; the first adhesive piece 1 and the second adhesive piece 2 are both double-sided adhesive tapes and respectively comprise a glue layer 12 and a base material layer 11 which are arranged along the thickness direction of the double-sided adhesive tapes; the glue layer 12 is positioned on two sides of the base material layer 11; a part of the glue in the glue layer 12 penetrates into the pores of the sound-transmitting membrane 3.

The sound-transmitting membrane 3 is a polypropylene membrane, the diameter of the sound-transmitting membrane 3 is 2 times of the inner diameter of the first adhesive member 1, the thickness of the sound-transmitting membrane 3 is 10 micrometers, the surface roughness of the sound-transmitting membrane 3 is Ra =0.35um, the pore diameter of the sound-transmitting membrane 3 is 5um, the porosity of the sound-transmitting membrane 3 is 50%, the diameter of the sound-transmitting membrane 3 is 5mm, and the gram weight of the sound-transmitting membrane 3 is 9g/m2; the difference between the surface energy of the outer surface of the sound-transmitting membrane 3 and the surface tension of the glue layer 12 is 10mN/m; the surface energy of the outer surface of the sound-transmitting membrane 3 is 20mN/m, and the surface tension of the glue layer 12 is 10mN/m.

The waterproof sound-transmitting membrane assemblies in the above examples 1 to 7 and comparative examples 1 to 2 were subjected to performance tests, respectively, and the test results are shown in the following table:

as can be seen from the above test results, the waterproof sound-transmitting membrane assemblies provided in examples 1 to 7 described above in the present application did not exhibit delamination, while having good sound permeability and air tightness, both compared to the waterproof sound-transmitting membrane assembly (comparative example 1) in which the width of the rubberized region 4 was 25% greater than the width of the first adhesive member 1, and compared to the waterproof sound-transmitting membrane assembly (comparative example 2) in which the width of the rubberized region 4 was 10 times less than the thickness of the sound-transmitting membrane, and compared to the waterproof sound-transmitting membrane assembly (comparative example 3) in which the rubberized region was absent.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. A waterproof sound-transmitting membrane assembly comprising a first adhesive member, a second adhesive member and a sound-transmitting membrane bonded between said first adhesive member and said second adhesive member, wherein:

the edge area of the first adhesive piece is bonded with the edge area of the second adhesive piece, the area where the first adhesive piece and the second adhesive piece are directly bonded is an encapsulated area, and the side surface of the sound-transmitting membrane is isolated from the outside through the encapsulated area;

2. The waterproof acoustically transparent membrane assembly of claim 1, wherein said acoustically transparent membrane has a thickness of 8-30 μm and said first adhesive member has a width of 0.5-3mm.

3. The waterproof acoustically transparent membrane assembly of claim 1, wherein the inner diameter of the first adhesive member is 1.5-2.5mm and the inner diameter of the first adhesive member is 30-50% of the outer diameter;

4. The waterproof and acoustically transparent membrane assembly of claim 1, wherein the first and second adhesive members are double-sided adhesive and each comprise a glue layer and a substrate layer disposed along the thickness direction thereof; the glue layers are positioned on two sides of the base material layer;

the area where the first adhesive piece is adhered to the sound-transmitting membrane is a mucosa area, and in the mucosa area, part of glue in the glue layer permeates into membrane pores of the sound-transmitting membrane to form a permeation area; the dynamic shear strength of the glue layer is 700-1200kPa, and the displacement of the glue in the glue layer is 0.3-2mm.

5. The waterproof acoustically transparent membrane assembly of claim 4, in which the thickness of the glue layer is 20-60um, and the ratio of the thickness of the substrate layer to the thickness of the glue layer is 0.4-0.7; and/or the presence of a gas in the gas,

the average thickness of the penetration zone is 4-15um, and the average thickness of the penetration zone is not less than 50% of the film thickness; and/or the presence of a gas in the gas,

6. The waterproof and acoustically transparent membrane assembly of claim 4, wherein the elastic modulus of the substrate layer is 50-300MPa, the proof strain of the substrate layer is 0.5% -5%, and the vickers hardness of the substrate layer is 40-70HV;

the adhesive strength of the glue layer is 5N/25mm-30N/25mm.

7. The waterproof acoustically transparent membrane assembly of claim 4, wherein the difference between the surface energy of the outer surface of the acoustically transparent membrane and the surface tension of the glue layer is 5-15mN/m;

the surface roughness of the sound-transmitting membrane is Ra =0.15um-0.55um.

8. The waterproof sound-transmitting membrane assembly of claim 7, wherein the surface energy of the outer surface of the sound-transmitting membrane is 20 to 35mN/m and the surface tension of the glue layer is 10 to 20mN/m.

9. The waterproof acoustically transparent membrane assembly of claim 1, wherein the acoustically transparent membrane has a pore size of 0.1-10um, a porosity of 30-70%, a diameter of 1-5mm, and a grammage of 3-12g/m2.

10. The waterproof sound-transmitting membrane assembly according to claim 1, wherein the sound-transmitting membrane is any one of a nylon membrane, a polyethylene membrane, a polypropylene membrane, a polytetrafluoroethylene membrane, and a polyimide membrane;