CN116888977A - Waterproof sound-transmitting member - Google Patents
Waterproof sound-transmitting member Download PDFInfo
- Publication number
- CN116888977A CN116888977A CN202280016518.7A CN202280016518A CN116888977A CN 116888977 A CN116888977 A CN 116888977A CN 202280016518 A CN202280016518 A CN 202280016518A CN 116888977 A CN116888977 A CN 116888977A
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- CN
- China
- Prior art keywords
- waterproof sound
- transmitting
- sound
- waterproof
- transmitting member
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/14—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a face layer formed of separate pieces of material which are juxtaposed side-by-side
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/022—Mechanical properties
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
A waterproof sound-transmitting member is provided which has high waterproof properties, is low in sound loss even when used in compression to prevent interference of sound in a housing, does not impair the sound characteristics of a microphone or a speaker, and can be suitably used for waterproof protection of a microphone or a speaker of an electrical product. The waterproof sound-transmitting member is provided with a small area of the waterproof sound-transmitting membrane, and the stress required for compression of 40% in the direction perpendicular to the membrane surface of the waterproof sound-transmitting member is 1 to 600kPa.
Description
Technical Field
The present invention relates to a waterproof sound-transmitting member in which sound loss is hardly increased by compression when incorporated into a housing.
Background
An electric/electronic product such as a mobile phone, a smart watch, a cordless phone, a portable media player, a portable game device, a digital camera, a digital video camera, and a headset (hereinafter, simply referred to as an "electric product" but also used in terms of a concept including an electronic product) has a sound receiving portion such as a microphone and a speaker, and a sound emitting portion in its housing structure, and openings are provided at positions corresponding to the respective sound receiving portions and sound emitting portions, respectively, and sound is transmitted through the openings.
As represented by the popularity of smartphones, these electrical products are often used in outdoor environments and environments requiring water in homes, and are expected to have waterproof structures. For example, in a smart phone, a commodity having a waterproof function is becoming widespread.
Conventionally, waterproof sound-transmitting members which prevent water from entering into the inside of the housing and which have small acoustic losses are attached to the openings of the sound emitting portion and the sound receiving portion. The waterproof sound-transmitting member is composed of a waterproof sound-transmitting film and a supporting layer laminated on the periphery thereof, and has a sound-transmitting area where the waterproof sound-transmitting film is exposed.
The shape of the member is maintained by the support layer or the member is bonded to the frame, and the sound is transmitted through the waterproof sound-transmitting film in the sound-transmitting region. The waterproof sound-transmitting member is sometimes incorporated into an electrical product in a compressed state for the purpose of suppressing the intrusion and leakage of sound from the interface with the housing.
The waterproof sound-transmitting film is made of a soft material, so that the basis weight is reduced, and the acoustic loss of the waterproof sound-transmitting member is reduced. In order to reduce the basis weight, it is effective to select a material having a light specific gravity or to form a porous structure. However, the waterproof sound-transmitting membrane of a soft material and porous structure is easily deformed by compression.
Patent document 1 discloses a waterproof sound-transmitting film that reduces acoustic loss by using a soft material such as polyurethane. Patent document 2 discloses a waterproof sound-transmitting member in which a soft material such as silicone rubber is used for a waterproof sound-transmitting film, so that acoustic loss does not increase when the pressure returns to normal pressure after the application of water pressure. Patent document 3 discloses a waterproof sound-transmitting member in which distortion of transmitted sound is reduced by using a polyolefin resin foam for a support layer in the waterproof sound-transmitting member.
Prior art documents
Patent literature
Patent document 1: WO2015/105052
Patent document 2: japanese patent application laid-open No. 2014-7738
Patent document 3: japanese patent application laid-open No. 2015-142282
Disclosure of Invention
Problems to be solved by the invention
The waterproof sound-transmitting membrane is soft in material and porous in structure, and has small acoustic loss, but is easily deformed by external force. When such a waterproof sound-transmitting film is used for the waterproof sound-transmitting member, deformation occurs when the waterproof sound-transmitting film is compressed and incorporated into a housing, and acoustic loss increases.
The waterproof sound-transmitting member using the waterproof sound-transmitting film of a soft material disclosed in patent document 1 is not suitable for being incorporated into a frame having a high compression ratio.
The waterproof sound-transmitting member using the waterproof sound-transmitting membrane of a soft material disclosed in patent document 2 is deformed under water pressure, and when the normal pressure is recovered, the deformation is eliminated and the acoustic loss is recovered. However, acoustic losses in the structure in which the waterproof sound-transmitting member is assembled by compression and pressure is always applied to the waterproof sound-transmitting film are not considered.
In the waterproof sound-transmitting member using a foam for the support layer disclosed in patent document 3, distortion of sound caused by interference of the support layer is reduced. The dynamic viscoelasticity such as the loss elastic modulus and the loss elastic coefficient of the support layer is focused on, but flexibility is not considered. The deformation of the waterproof sound-transmitting membrane upon compression-assembling the waterproof sound-transmitting member is not considered.
The present invention provides a waterproof sound-transmitting member which can be used with a high compression ratio. In particular, it is an object of the present invention to provide a waterproof sound-transmitting member which can be compressively incorporated into a housing even when a waterproof sound-transmitting film made of a soft material having a small sound loss is used, and which can suppress the sound loss as a whole to be low.
Means for solving the problems
The present inventors have conducted intensive studies and as a result, have found that by conducting a study on a combination of a waterproof sound-transmitting membrane and a support layer, the stress required for compressing the membrane surface of the waterproof sound-transmitting member by 40% in the vertical direction is 1 to 600kPa, and acoustic loss can be reduced when the waterproof sound-transmitting member is used at a high compression rate, and have completed the present invention.
That is, the present invention relates to a waterproof sound-transmitting member described below.
(1) A waterproof sound-transmitting member comprising a waterproof sound-transmitting film and a support layer laminated on at least one surface of the waterproof sound-transmitting film, wherein the waterproof sound-transmitting film has a sound-transmitting region where both surfaces of the waterproof sound-transmitting film are exposed, and the stress required for 40% compression in a direction perpendicular to the film surface of the waterproof sound-transmitting film is 1 to 600kPa.
(2) The waterproof sound-transmitting member according to (1), wherein a support layer is laminated on both surfaces of the waterproof sound-transmitting film.
(3) The waterproof sound-transmitting member according to (1) or (2), wherein the support layer is composed of a single layer or a plurality of layers, and at least comprises a layer using a sheet having a stress of 600kPa or less required for compression of 40% in the vertical direction.
(4) The waterproof sound-transmitting member according to (3), wherein the sheet having a stress of 600kPa or less required for 40% compression in the vertical direction comprises a sheet layer made of a synthetic resin porous material.
(5) The waterproof sound-transmitting member according to (4), wherein the synthetic resin porous material is a synthetic resin porous material selected from the group consisting of a polyolefin resin, a urethane resin and an acrylic resin.
(6) The waterproof sound-transmitting member according to any one of (3) to (5), wherein a layer using a sheet having a stress of 600kPa or less required for compression of 40% in the vertical direction among the layers constituting the support layer occupies 40% or more of the entire thickness of the waterproof sound-transmitting member.
(7) The waterproof sound-transmitting member according to any one of (1) to (6), wherein the waterproof sound-transmitting film has a tensile elastic modulus of 0.5MPa to 20MPa.
(8) The waterproof sound-transmitting member according to any one of (1) to (7), wherein the waterproof sound-transmitting film contains a material having a 100% modulus of 1MPa to 20MPa.
(9) The waterproof sound-transmitting member according to any one of (1) to (8), wherein the waterproof sound-transmitting film is composed of a polyurethane resin.
(10) The waterproof sound-transmitting member according to any one of (1) to (9), wherein an area of the support layer laminated on at least one surface of the waterproof sound-transmitting film is 1mm 2 ～50mm 2 。
(11) The waterproof sound-transmitting member according to any one of (1) to (10), wherein the planar shape of the sound-transmitting region has no corner and the roundness is 0.45 to 1.
(12) The waterproof sound-transmitting member according to any one of (1) to (11), wherein the area of the sound-transmitting region is 0.5mm 2 ～40mm 2 。
(13) The waterproof sound-transmitting member according to any one of (1) to (12), wherein a support layer is laminated on a peripheral edge portion of the waterproof sound-transmitting film.
ADVANTAGEOUS EFFECTS OF INVENTION
The waterproof sound-transmitting member having the waterproof sound-transmitting membrane and the support layer is compressed in the thickness direction thereof (the direction perpendicular to the membrane surface of the waterproof sound-transmitting membrane) when incorporated into the housing. The force exerted by the compression is applied to the waterproof sound-transmitting membrane through the support layer. If an excessive force is applied to the waterproof sound-transmitting film, deformation occurs, and vibration due to the incident sound is blocked, so that acoustic loss increases.
According to the present invention, by setting the stress required to compress the membrane surface of the waterproof sound-transmitting member by 40% or less in the vertical direction to 600kPa or less, the force applied to the waterproof sound-transmitting membrane when the waterproof sound-transmitting member is incorporated into the housing at a high compression rate can be reduced, thereby reducing acoustic loss. Such a technical effect can be achieved more reliably by optimally combining the material of the support layer, the material of the film, the shape of the member, and the like.
That is, by using a film having a low tensile elastic modulus and being easily deformed as the waterproof sound-transmitting film and combining a material having a certain thickness and a small compressive stress with the support layer, the increase of acoustic loss due to compression when the support layer is incorporated into the housing can be prevented.
Drawings
Fig. 1 is a cross-sectional view showing an example of the structure of the waterproof sound-transmitting member of the present invention.
Fig. 2 is a plan view showing an example of the structure of the waterproof sound-transmitting member of the present invention.
Fig. 3 is a schematic view of the acoustic measurement device.
Fig. 4 is a schematic view of a compression test.
Detailed Description
The waterproof sound-transmitting member of the present invention is a waterproof sound-transmitting member in which a support layer is laminated on at least one surface of a waterproof sound-transmitting film, and is characterized by having a sound-transmitting region in which both surfaces of the waterproof sound-transmitting film are exposed, and by having a stress required for compressing the film surface of the waterproof sound-transmitting member by 40% in a vertical direction of 1 to 600kPa.
Fig. 1 shows an example of the structure of the waterproof sound-transmitting member of the present invention. According to fig. 1, in the waterproof sound-transmitting member 1 of the present invention, the support layer 3 is laminated on both surfaces of the waterproof sound-transmitting membrane 2 so as to be disposed on the periphery of the sound-transmitting region 4.
1. Waterproof sound-transmitting member
(1) Structure of the
The waterproof sound-transmitting member of the present invention comprises a waterproof sound-transmitting membrane and a support layer, and the support layer is laminated on at least a part of at least one surface of the waterproof sound-transmitting membrane. Further, the waterproof sound-transmitting film has a region (=sound-transmitting region) where both surfaces of the waterproof sound-transmitting film are exposed without laminating the support layer.
In the waterproof sound-transmitting member of the present invention, sound is transmitted through the sound-transmitting region. The incident sound vibrates the waterproof sound-transmitting membrane and transmits the sound to the opposite surface. That is, in the waterproof sound-transmitting member of the present invention, the support layer is laminated on the portion of the waterproof sound-transmitting film other than the sound-transmitting region.
(2) Compressive stress
The waterproof sound-transmitting member is compressed in a direction perpendicular to the membrane surface of the waterproof sound-transmitting membrane (the thickness direction of the member), and is mounted in the housing. The force exerted by the compression is applied to the waterproof sound-transmitting membrane through the support layer. If an excessive force is applied to the waterproof sound-transmitting film, deformation occurs, and vibration due to the incident sound is blocked, and acoustic loss increases.
In order to reduce the force applied to the waterproof sound-transmitting member to reduce acoustic loss when the waterproof sound-transmitting member is mounted in the housing at a high compression rate, the stress required for the waterproof sound-transmitting member to compress 40% in the direction perpendicular to the membrane surface of the waterproof sound-transmitting member is required to be 600kPa or less, preferably 400kPa or less, and more preferably 300kPa or less.
On the other hand, since the energy dissipation due to the vibration of the waterproof sound-transmitting member is suppressed and the acoustic loss is reduced by pressing and fixing the waterproof sound-transmitting member to the housing, the stress required for compressing the waterproof sound-transmitting member by 40% in the direction perpendicular to the membrane surface of the waterproof sound-transmitting member is required to be 1kPa or more, preferably 20kPa or more, and more preferably 40kPa or more.
Fig. 4 shows a schematic of the method for measuring compressive stress according to the present invention. In fig. 4, reference numeral 1 is a waterproof sound-transmitting member, reference numeral 17 is a parallel plate, and reference numeral 18 is a compression direction.
In general, the compression test is to clamp a test piece to 2 parallel plates with a compression tester and apply a load to determine stress. In the present invention, a test piece (waterproof sound-transmitting member) is held by parallel plates so that the parallel plate surfaces are parallel to the membrane surfaces of the waterproof sound-transmitting membrane. In this case, when the support layers of the waterproof sound-transmitting member are provided on both sides of the waterproof sound-transmitting membrane, the support layers on both sides are provided so as to be in contact with the parallel plates. On the other hand, in the case where the support layer of the waterproof sound-transmitting member is provided only on one side of the waterproof sound-transmitting membrane, the waterproof sound-transmitting membrane and the support layer are provided so as to be in contact with the parallel plates, respectively.
Further, the parallel plates were moved in the vertical direction with respect to the membrane surface of the waterproof sound-transmitting membrane so as to narrow the interval of 2 parallel plates in such a manner that a compressive force was applied to the membrane surface of the waterproof sound-transmitting membrane in the vertical direction, and a compressive force was applied to the waterproof sound-transmitting member.
The "stress required for compression of 40%" according to the present invention can be calculated by the following method: the thickness of the waterproof sound-transmitting member (total of the thicknesses of the support layer and the waterproof sound-transmitting film) was set to 100%, and the stress at 40% of the compressed thickness (at the time when the compressed thickness was compressed to 60% of the thickness before compression) was measured and divided by the area of the support layer.
The area of the support layer is the area of the portion where the support layer contacts the parallel plate of the compression tester when the support layer is a single layer or when a plurality of support layers are stacked and the shape thereof is constant. However, when the plurality of support layers are stacked and the shape thereof is not constant, the calculation is performed by using the area of the portion that receives the force during compression, that is, the portion where the plurality of support layers are most overlapped when viewed from the vertical direction (the direction perpendicular to the film surface of the waterproof sound-transmitting film or the compression direction).
For example, in the case where the outermost layer (layer in contact with the parallel plate) of the support layer has a large area and the inner layer has a small area, stress is applied to the area of the inner layer overlapping in the vertical direction, and therefore the area of the support layer becomes the area of the inner layer. On the other hand, when the area of the outermost layer of the support layer is small and the area of the inner layer is large, stress is applied to the area of the outermost layer, and therefore the area of the support layer becomes the area of the outermost layer.
2. Waterproof sound-permeable membrane
(1) Physical properties of film
The waterproof sound-transmitting membrane used in the waterproof sound-transmitting member of the present invention is a membrane that allows sound to pass therethrough and blocks water from passing therethrough, and at least a part of the membrane has a sound-transmitting region. The softer the waterproof sound-transmitting membrane is, the easier the membrane vibrates, and the smaller the acoustic loss is. In the waterproof sound-transmitting film, the tensile elastic modulus as an index of softness is preferably 20MPa or less, more preferably 10MPa or less.
On the other hand, in order to reduce the deformation due to compression of the waterproof sound-transmitting member and to reduce acoustic loss, the tensile elastic modulus of the waterproof sound-transmitting film is preferably 0.5MPa or more, more preferably 2MPa or more.
In order to reduce the tensile elastic modulus of the waterproof sound-transmitting membrane, it is effective to use a soft material. The 100% modulus as an index of softness of the material is preferably 1 to 20MPa. The 100% modulus of the material is a physical property of the material itself constituting the waterproof sound-transmitting film, and is not affected by the porous structure or the like. The 100% modulus of the present invention is a value measured in a nonporous film obtained by dissolving a waterproof sound-transmitting film in a solvent and then drying the film.
The water pressure resistance of the water-proof sound-transmitting film of the present invention measured by the JIS L1092B method (high water pressure method) is preferably 10 to 400kPa, more preferably 30 to 400kPa. When the water pressure resistance is in the range of 10 to 400kPa, high sound permeability and water repellency can be obtained.
The elongation at break of the waterproof sound-transmitting film is preferably 100 to 500%, more preferably 150 to 400%, and particularly preferably 80 to 260%. When the elongation at break is 100 to 500%, good sound permeability and sufficient water repellency can be maintained.
The air permeability of the waterproof sound-transmitting film is preferably 3 to 500 seconds per 100mL, more preferably 3 to 300 seconds per 100mL, in the JIS L1096 Gellan method. If the air permeability is 3 to 500 seconds/100 mL, good sound permeability can be obtained.
The waterproof sound-transmitting film of the present invention has sound-transmitting properties such that the sound loss at 1kHz is less than 10dB, the sound loss at 2kHz is less than 5dB, and the sound loss at 5kHz is less than 5 dB.
(2) Film material
The material constituting the waterproof sound-transmitting membrane used in the present invention is not particularly limited, but is preferably a relatively soft material as described above, and more preferably a soft synthetic resin satisfying the above 100% modulus range (1 to 20 MPa) is used.
Specifically, an elastomer such as urethane resin or silicone rubber is preferably used. The waterproof sound-transmitting membrane is preferably porous because it is made into a porous membrane and becomes softer. From the viewpoint of easy control of the structure, it is more preferable to use a polyurethane resin porous film.
Examples of the polyurethane resin include polyester polyurethane, polyether polyurethane, and polycarbonate polyurethane. At least one of them is preferably used, and two or more of them may be used in combination.
Here, the polyurethane resin is a resin obtained by polymerizing an isocyanate component and a polyol component.
Examples of the isocyanate component include aliphatic diisocyanate, aromatic diisocyanate, and alicyclic diisocyanate, and 2 or more kinds of the isocyanate component may be used alone or in combination. Specific examples of the aliphatic diisocyanate include 1, 6-hexamethylene diisocyanate and the like. Examples of the aromatic diisocyanate include xylylene diisocyanate, 4' -diphenylmethane diisocyanate, toluene diisocyanate, and the like. Examples of the alicyclic diisocyanate include 1, 4-cyclohexane diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate, and the like. If necessary, an isocyanate having 3 or more functions may be used.
On the other hand, as the polyol component, polyester polyols obtained by using polyethylene adipate, polybutylene adipate, polycaprolactone polyol, and the like are exemplified; a polycarbonate polyol obtained by using polyhexamethylene carbonate or the like; polyether polyols obtained by using polyethylene glycol, polypropylene glycol, polytetramethylene glycol, etc. These can be used either singly or in combination.
In addition, various additives may be added to the polyurethane resin as necessary. Examples of the additives include water-repellent agents, crosslinking agents, inorganic fine particles, plasticizers, antioxidants, ultraviolet absorbers, smoothing agents such as amide waxes, hydrolysis inhibitors, pigments, yellowing inhibitors, and matting agents.
The porous film of the synthetic resin is preferably a porous film obtained by solidifying a synthetic resin solution containing a synthetic resin and a polar organic solvent soluble in water. As a method for producing the porous film, the polyurethane resin is exemplified by the following production method: a porous film is produced by applying a polyurethane resin solution containing a polyurethane resin, inorganic fine particles and a polar organic solvent to one surface of a suitable releasable substrate, and then immersing the applied polyurethane resin solution in water to solidify the polyurethane resin.
Here, the polyurethane resin solution may contain inorganic fine particles whose surfaces are hydrophobized. Since the inorganic fine particles whose surfaces are hydrophobized have a high affinity for the polar organic solvent, the inorganic fine particles whose surfaces are hydrophobized are present in the solution in such a state that the polar organic solvent surrounds the periphery of the inorganic fine particles whose surfaces are hydrophobized, and the concentration of the polar organic solvent locally increases. Therefore, in the step of immersing the polyurethane resin solution in water to solidify the polyurethane resin, voids are formed around the inorganic fine particles whose surfaces are hydrophobized. In this way, a porous film made of polyurethane resin can be efficiently formed.
Examples of the inorganic fine particles include carbonates such as calcium carbonate and magnesium carbonate; silicic acid such as silica and diatomaceous earth; silicates such as talc and zeolite; hydroxides such as aluminum hydroxide and magnesium hydroxide; sulfates such as barium sulfate and calcium sulfate; borates such as aluminum borate and zinc borate; titanates such as potassium titanate; metal oxides such as zinc oxide and titanium oxide; particles of carbon materials such as carbon black.
The inorganic fine particles may be porous or nonporous. The shape of the inorganic fine particles may be a fixed shape such as a polygon, a needle, a sphere, a cube, a spindle, or a plate, or an unfixed shape, and is not particularly limited. The inorganic fine particles may be used alone or in combination of 1 or more than 2. Among them, calcium carbonate microparticles and silica microparticles are preferable because of the large adsorption amount of polar organic solvents such as N, N-dimethylformamide and the easiness of formation of micropores.
The content of the inorganic fine particles varies depending on the type thereof, and therefore cannot be generally said, but is usually preferably 1 to 75% by mass relative to the total solid content of the polyurethane resin solution. By setting the content to 1 mass% or more, sufficient porosity can be obtained. When the content is 75 mass% or less, the strength, particularly tensile strength, of the obtained microporous membrane can be maintained, and sufficient water repellency can be obtained. The content of the inorganic fine particles is preferably 3 to 40% by mass relative to the total solid content of the polyurethane resin solution.
Examples of the polar organic solvent include N, N-dimethylformamide and N, N-dimethylacetamide.
The waterproof sound-transmitting film according to the preferred embodiment can be produced, for example, by applying a polyurethane resin solution containing a synthetic resin including a polyurethane resin main body, 1 to 75 mass% of inorganic fine particles relative to the total solid content, and a polar organic solvent to a releasable substrate.
Examples of the method for applying the polyurethane resin solution to the releasable substrate include a method using a floating blade coater, a roll blade coater, a comma blade coater, a reverse coater, a lip coater, a roll coater, a die coater, and the like.
The polyurethane resin solution is preferably applied in an amount of 10 to 200g/m in terms of solid content 2 More preferably 10 to 750g/m 2 . By setting the coating amount within this range, a porous film having a thickness of 10 to 150 μm can be obtained. That is, the thickness of the waterproof sound-transmitting film of the present invention is preferably 10 to 150. Mu.m, more preferably 15 to 80. Mu.m.
After the step of applying the polyurethane resin solution to the releasable substrate, the polyurethane resin solution is immersed in water at 10 to 40 ℃. In this process, water enters the inside of the polyurethane resin solution, and the polar organic solvent contained in the polyurethane resin solution is almost completely replaced with water, whereby the polyurethane resin is coagulated.
The immersion time in water is preferably 30 seconds to 10 minutes, more preferably 1 to 5 minutes. If the impregnation time is less than 30 seconds, the polyurethane resin may not be completely coagulated, and sufficient voids may not be formed, and thus water repellency and sound permeability may not be obtained. If the dipping time exceeds 10 minutes, productivity is lowered.
Then, the mixture is washed in warm water at 30 to 80 ℃ for 3 to 15 minutes, and after the residual polar organic solvent is removed, the mixture is heat-treated at 50 to 150 ℃ for 1 to 10 minutes and dried. Then, the releasable substrate was removed to form a porous film made of polyurethane resin.
The method for producing a porous polyurethane resin film described above can be applied to synthetic resins other than polyurethane resins. In the present invention, polyurethane resin is suitable in view of flexibility and easiness of forming a porous structure, but other synthetic resins can be used to produce a porous film by the same method.
The porous film thus obtained can be subjected to a waterproofing process as a post-treatment. This can further improve the water repellency. Examples of the water repellent used in the water repellent processing include paraffin water repellent, silicone water repellent, fluorine water repellent, and the like. Among them, fluorine-based waterproofing agents are preferable from the viewpoint of imparting high water repellency. The waterproofing process can be performed according to a conventional method such as a filling method or a spraying method.
The waterproof sound-transmitting film used in the present invention may be a rubber-like elastic body (thermosetting elastic body (rubber-based)) in addition to the synthetic resin porous film such as the above polyurethane resin porous film. The rubber-like elastic material is not particularly limited as long as it has rubber-like elasticity, and examples thereof include silicone rubber, ethylene Propylene Diene Monomer (EPDM), acrylic rubber, and natural rubber. Among them, silicone rubber having excellent properties such as heat resistance and chemical resistance is preferably used.
(3) Film thickness
The thickness of the waterproof sound-transmitting film used in the present invention is preferably 10 to 150. Mu.m, more preferably 15 to 80. Mu.m. If the film is too thick, the sound permeability is lowered, and the film cannot be used for small-sized electric products with large restrictions in the space to be built in, and if it is too thin, the strength is lowered and the film is likely to be broken.
2. Support layer
(1) Construction of the support layer
The support layer has a function of supporting, fixing, or improving operability of the waterproof sound-transmitting member in addition to the waterproof function. In addition, the support layer can absorb compression pressure when the frame is assembled, or can strengthen the film, stabilize the shape, and the like.
The support layer may be laminated on at least one surface of the waterproof sound-transmitting film, or may be laminated on only one surface or both surfaces. The support layer is laminated not on the entire surface of the waterproof sound-transmitting membrane but on a part thereof.
Preferably, the support layers are laminated on both sides of the waterproof sound-transmitting membrane. When the support layers are laminated on both surfaces of the waterproof sound-transmitting film, the waterproof sound-transmitting film can be prevented from directly contacting the housing when the waterproof sound-transmitting member is incorporated into the housing, and therefore, defects due to damage or deformation are less likely to occur.
In order to reduce the stress required for 40% compression in the vertical direction relative to the membrane surface of the waterproof sound-transmitting member to 1 to 600kPa, it is effective to use a soft material for at least a part of the support layer.
The layer constituting the support layer may be a single layer or a multilayer stack, but it is preferable that at least a part (or the whole) of the support layer contains a sheet having a stress of 600kPa or less required for 40% compression in the vertical direction, and more preferably contains a sheet having a stress of 300kPa or less.
By combining the waterproof sound-transmitting film, which includes a layer using such a sheet having a small compressive stress as a support layer and has a low tensile elastic modulus and is easily deformed, an increase in acoustic loss due to compression when incorporated into a device can be significantly suppressed. The term "vertical direction" in the layers constituting the support layer means the thickness direction of the layer or the direction perpendicular to the film surface of the waterproof sound-transmitting film when the waterproof sound-transmitting film is laminated.
When the support layer is a single layer, the layer is preferably a layer using a sheet having a stress of 600kPa or less required to compress 40% in the vertical direction, and more preferably a layer using a sheet having a stress of 300kPa or less required to compress 40% in the vertical direction.
When the support layer is constituted of a plurality of layers, at least one layer constituting the support layer is preferably a layer using a sheet having a stress of 600kPa or less required to compress 40% in the vertical direction, more preferably a layer using a sheet having a stress of 300kPa or less required to compress 40% in the vertical direction.
When the support layer is composed of a plurality of layers, the layer constitution is not particularly limited, and as a layer using a sheet having a stress of 600kPa or less (hereinafter referred to as a "sheet having a compressive stress of 600kPa or less") required to compress 40% in the vertical direction, a plurality of layers using sheets having different types of resins or having different compressive stresses within the above-mentioned range may be stacked.
In addition, a layer using a hard sheet material having a stress exceeding 600kPa required for compression of 40% in the vertical direction (a layer which is hardly deformed by compression in use) may be provided as the spacer layer.
(2) Layer using sheet having compression stress of 600kPa or less
The sheet having a compressive stress of 600kPa or less is preferably made of a synthetic resin material. Examples of the synthetic resin include polyolefin resins, polyurethane resins, polyacrylic resins, and polyester resins.
Examples of the polyolefin resin include polyethylene, polypropylene, and polyvinyl acetate. Examples of the polyurethane resin include polyester polyurethane, polyether polyurethane, and polycarbonate polyurethane.
The polyacrylic resin includes polyacrylate and polymethacrylate. Examples of the polyester resin include polyethylene terephthalate (PET) and polybutylene terephthalate.
In addition, polyvinyl chloride, acrylic rubber, silicone rubber, and the like can be cited. Preferably, a synthetic resin selected from the group consisting of polyolefin-based resins, polyacrylic resins, and polyurethane resins is used.
The synthetic resin material may be porous or nonporous, but in order to control the stress required for 40% compression in the vertical direction to 600kPa or less, a sheet mainly composed of a sheet layer (layer constituting the sheet) composed of a porous synthetic resin material is preferable. Examples of the synthetic resin porous material include polyolefin porous materials such as polyethylene and polypropylene, polyurethane porous materials, and acrylic resin porous materials.
The sheet mainly composed of the above-mentioned synthetic resin porous material may be composed of only a sheet layer composed of a synthetic resin porous material, or may be composed of a sheet layer other than the above-mentioned synthetic resin porous material. Examples of the sheet layer made of a material other than the synthetic resin porous material include a sheet layer (auxiliary layer) made of a non-porous synthetic resin material such as a non-porous polyester resin material.
The thickness of the auxiliary layer is not particularly limited, and the stress required for compressing the entire sheet in the vertical direction by 40% is preferably 600kPa or less, and therefore the thickness of the sheet layer made of the synthetic resin porous material is preferably 50% or more, more preferably 70% or more, and particularly preferably 80% or more, with respect to the thickness of the entire sheet.
The sheet having a compressive stress of 600kPa or less may be provided with an adhesive layer on at least one side thereof. The adhesive layer may be provided on only one side or both sides of the sheet. The adhesive layer can be formed by applying an adhesive, for example. Examples of the adhesive include an acrylic adhesive, a silicone adhesive, and a rubber adhesive.
The thickness of the adhesive layer is not particularly limited, and the stress required for compressing the entire sheet in the vertical direction by 40% is preferably 600kPa or less, and therefore, the thickness of the sheet layer made of the synthetic resin porous material is preferably 50% or more, more preferably 70% or more, and particularly preferably 80% or more with respect to the thickness of the entire sheet.
In the case where both the auxiliary layer and the adhesive layer are provided, the stress required for compressing the entire sheet in the vertical direction by 40% is preferably 600kPa or less, and the thickness of the sheet layer made of the synthetic resin porous material is preferably 50% or more, more preferably 70% or more, and particularly preferably 80% or more with respect to the thickness of the entire sheet.
As a layer (waterproof adhesive layer) using a sheet having a compressive stress of 600kPa or less provided with an adhesive layer, an adhesive waterproof tape in which an adhesive is applied to one side or both sides of a core material made of a synthetic resin porous material is preferable. It is preferable to use a double-sided adhesive waterproof tape in which an adhesive is applied to both sides of a core material made of a synthetic resin porous material. The waterproof adhesive layer has a waterproof function or an adhesive function at an interface between the waterproof sound-transmitting film and the support layer, an interface between the layers using each sheet in the support layer, an interface between the support layer and the frame, and the like.
The adhesive layer may not be provided on the sheet having a compressive stress of 600kPa or less. A layer (buffer layer) using a sheet having a compressive stress of 600kPa or less without an adhesive layer can be used to compress the buffer layer and fix the buffer layer to the frame by its reaction force, thereby improving the water resistance of the boundary between the frame and the water-proof sound-transmitting member. The buffer layer can also be the outermost layer of the support layer.
The thickness of the sheet having a compressive stress of 600kPa or less is not particularly limited, and is preferably 10 μm or more, more preferably 30 μm or more, further preferably 100 μm or more, particularly preferably 150 μm or more. The upper limit of the thickness is also not particularly limited, and preferably has a thickness of 3000 μm or less, more preferably 1500 μm or less, still more preferably 600 μm or less, particularly preferably 400 μm or less.
The physical properties of a sheet having a compressive stress of 600kPa or less are not substantially dependent on the type of resin, but in the case where a sheet having a compressive stress of 600kPa or less is mainly a sheet layer made of a polyolefin resin porous material, the stress required for 40% compression in the vertical direction is more preferably 50 to 300kPa, and still more preferably 80 to 250kPa.
When the sheet having a compressive stress of 600kPa or less is mainly composed of a sheet layer made of a porous polyurethane resin material or a porous polyacrylic resin material, the stress required for compression of 40% in the vertical direction is more preferably 0.1 to 100kPa, still more preferably 0.1 to 30kPa, and particularly preferably 0.1 to 10kPa. When the support layer is formed, layers of various resin types are preferably combined as necessary.
More specifically, a sheet having a compressive stress of 600kPa or less is a sheet mainly composed of a porous polyolefin resin material and having adhesive layers on both surfaces. Alternatively, a sheet including a sheet layer made of a porous polyurethane resin material or a porous polyacrylate resin material as a main body and a non-porous PET layer as an auxiliary layer may be used.
(3) Spacer layer
On a part of the support layer, a layer using a hard sheet exhibiting high compressive stress can be provided as the spacer layer. The spacer layer is preferably formed of a synthetic resin having no pores, and specifically, a polyester film such as polyethylene terephthalate (PET) having no pores is exemplified.
The spacer layer is expected to have functions of adjusting the total thickness of the waterproof sound-transmitting member, stabilizing the waterproof sound-transmitting member by supporting the structure (maintaining the thickness of the waterproof sound-transmitting member without being deformed when the waterproof sound-transmitting member is compressed for use, and the like). The spacer layer may be provided with or without an adhesive layer. For example, an adhesive waterproof tape having an adhesive applied to one or both surfaces thereof, or a PET film having no adhesive applied thereto can be used.
The spacer layer is a hard layer which hardly deforms under compression in use, and it is not easy to compress the thickness by 40% itself, and the stress required for compressing the spacer layer by at least 40% in the vertical direction is certainly in the range exceeding 600kPa, but it is not necessarily clear, but it is preferable that the compressive stress is at least 1MPa, more preferably 10MPa or more, and particularly preferably 100MPa or more.
The thickness of the spacer layer is not particularly limited, but is preferably 5 to 200. Mu.m, more preferably 5 to 150. Mu.m. When the support layer contains a plurality of spacer layers, the total thickness thereof is preferably 10 to 300. Mu.m, more preferably 20 to 250. Mu.m.
(4) Structure of supporting layer
(i) Layer structure
The support layer is laminated on at least one surface of the waterproof sound-transmitting film, and has a function of fixing the waterproof sound-transmitting member to the frame and improving operability. The support layer may be laminated on only one side of the waterproof sound-transmitting film, or may be laminated on both sides.
Preferably, the support layers are laminated on both sides of the waterproof sound-transmitting membrane. When the support layers are laminated on both surfaces of the waterproof sound-transmitting film, the waterproof sound-transmitting film can be prevented from directly contacting the housing when the waterproof sound-transmitting member is assembled to the housing, and therefore, defects due to damage and deformation are less likely to occur.
Only in the case where the waterproof sound-transmitting membrane has a support layer on one side, the support layer may be a single layer or a plurality of layers.
In the case where the waterproof sound-transmitting membrane has the support layer on both sides, one side may be formed as a single layer and the other side may be formed as a single layer. In this case, both may be the same layer or different layers composed of different kinds of materials.
In the case where the waterproof sound-transmitting membrane has the support layer on both sides, one side may be formed as a single layer and the other side may be formed as a plurality of layers. The support layers on both sides may be formed in multiple layers.
When the support layer is a single layer, the support layer is preferably formed of a layer using a sheet having a compressive stress of 600kPa or less, and is laminated on the waterproof sound-transmitting film. When the support layer is a multilayer, at least one layer is preferably a layer using a sheet having a compressive stress of 600kPa or less. This can improve the waterproof property of the boundary between the waterproof sound-transmitting film and the support layer.
The layer using the sheet material having a compressive stress of 600kPa or less, which is made of a soft material, can exert the effects of suppressing the 40% compressive stress of the entire waterproof sound-transmitting member, reducing the force applied to the waterproof sound-transmitting film when the frame is mounted with a high compression ratio, and reducing the acoustic loss.
In the case where the support layer is a plurality of layers, as described above, at least one layer is preferably a layer using a sheet having a compressive stress of 600kPa or less. As the layer using a sheet having a compressive stress of 600kPa or less, a sheet including a sheet layer made of the above synthetic resin porous material as a main body can be preferably used.
More specifically, as the sheet having a compressive stress of 600kPa or less, for example, a sheet having a sheet layer made of a polyolefin resin porous material as a main body and preferably having a compressive stress of about 50 to 300kPa, or a sheet having a sheet layer made of a polyurethane resin porous material or a polyacrylic resin porous material as a main body and preferably having a compressive stress of about 0.1 to 100kPa can be used. Alternatively, a waterproof adhesive layer having an adhesive layer and/or a buffer layer having no adhesive layer can be used.
These layers having an adhesive layer, layers having no adhesive layer, or various layers having different compressive stresses, or a spacer layer may be further suitably used to design a support layer having a desired compressive stress and thickness. Further, by combining these with an appropriate waterproof sound-transmitting film, a waterproof sound-transmitting member having a stress of 1kPa to 600kPa required to compress 40% in a direction perpendicular to the film surface of the waterproof sound-transmitting film can be obtained.
The waterproof sound-transmitting member of the present invention can be produced by forming and laminating sheets, films, membranes, and the like constituting each layer into a desired shape based on the above-described design. As the lamination method, a method of bonding the layers by a known method such as a press bonding method is exemplified.
The multilayered structure may include one or more water-repellent adhesive layers or buffer layers, and one or more spacer layers may be combined as needed. Further, two or more different types of waterproof adhesive layers, two or more different types of buffer layers, or a combination of waterproof adhesive layers and buffer layers may be laminated, and one or more spacer layers may be further combined as needed.
In addition, among the layers constituting the support layer, at least one layer is preferably a waterproof adhesive layer.
More specifically, a support layer including a layer (preferably a waterproof adhesive layer or a buffer layer) using a sheet having a compressive stress of 600kPa or less of the same or different types is laminated on one side or both sides of the waterproof sound-transmitting film. The spacer layer (preferably, a adhesive waterproof tape made of a non-porous synthetic resin such as a non-porous PET or a non-porous synthetic resin film such as a non-porous PET film) may be laminated on the support layer as needed.
If a spacer layer is formed between the waterproof sound-transmitting membrane and the layer of the sheet material having a compressive stress of 600kPa or less contained in the support layer, the layer structure of the entire waterproof sound-transmitting member is stabilized. In addition, the layer structure of the entire waterproof sound-transmitting member can be stabilized by providing spacers on both sides of the layer using the sheet having a compressive stress of 600kPa or less included in the support layer and sandwiching the spacer.
The following shows preferred specific examples of the structure of the waterproof sound-transmitting membrane and the support layer, but is not limited thereto.
The waterproof adhesive layer is disposed on one side of the waterproof sound-transmitting film, and the same or different waterproof adhesive layers are disposed on the opposite side.
A waterproof adhesive layer or a spacer layer is disposed on one side of the waterproof sound-transmitting film, and a buffer layer is disposed on the opposite side.
A waterproof adhesive layer or a spacer layer is disposed on one side of the waterproof sound-transmitting film, a spacer layer is disposed on the opposite side of the waterproof sound-transmitting film, and a waterproof adhesive layer or a buffer layer is further laminated.
A waterproof adhesive layer or a spacer layer is disposed on one side of the waterproof sound-transmitting film, a spacer layer is disposed on the opposite side of the waterproof sound-transmitting film, a waterproof adhesive layer or a buffer layer is laminated thereon, and a spacer layer is further laminated.
The thickness of the support layer (the thickness of the layer in the case of a single layer, and the total thickness of the constituent layers in the case of a multilayer structure) is not particularly limited, but is preferably 30 to 3000 μm, more preferably 100 to 1500 μm, still more preferably 300 to 1000 μm, and particularly preferably 500 to 800 μm.
Among them, the thickness of one layer of the sheet having a compressive stress of 600kPa or less is preferably 30 to 3000 μm, more preferably 100 to 1500 μm, as in the case of a single layer.
The total thickness of the layers constituting the support layer, in which the sheet having a compressive stress of 600kPa or less is used, is preferably 30% or more, more preferably 40% or more, particularly preferably 50% or more of the total thickness of the waterproof sound-transmitting member.
When the layers using the sheet having a compressive stress of 600kPa or less are provided on both surfaces of the waterproof sound-transmitting membrane, the total thickness of the layers using the sheet having a compressive stress of 600kPa or less is preferably 60% or more, more preferably 70 to 98%, still more preferably 85 to 98%, and particularly preferably 90 to 96% relative to the total thickness of the waterproof sound-transmitting member.
When the layer using the sheet having a compressive stress of 600kPa or less is provided only on one side of the waterproof sound-transmitting membrane, the total thickness of the layers using the sheet having a compressive stress of 600kPa or less is preferably 40% or more, more preferably 50% or more, still more preferably 50 to 70%, and particularly preferably 50 to 60% of the total thickness of the waterproof sound-transmitting member.
Here, the thickness of the waterproof sound-transmitting member refers to the thickness of the thickest part of the waterproof sound-transmitting member including the waterproof sound-transmitting film and the support layer.
(ii) Shape of the support layer
In the case where the support layers are laminated on both sides of the waterproof sound-transmitting membrane, it is preferable that the support layers on both sides of the laminate are positioned so as to overlap with each other in the same shape when viewed from the vertical direction of the waterproof sound-transmitting membrane surface, because the force applied by compression is less likely to be transmitted to the waterproof sound-transmitting membrane.
The support layer is preferably laminated on the peripheral edge of the waterproof sound-transmitting membrane, because it does not interfere with vibration of the waterproof sound-transmitting membrane. In addition, when the shape of the support layer is a shape that is constant with respect to the cross section in the horizontal direction (parallel to the membrane surface) of the waterproof sound-transmitting membrane, the force applied by compression is preferably not easily transmitted to the waterproof sound-transmitting membrane.
In order to reduce acoustic loss by making the stress applied by compression of the waterproof sound-transmitting member less likely to deviate and reducing deformation of the sound-transmitting region of the waterproof sound-transmitting membrane, it is preferable to make the area (of the cross section in the direction parallel to the membrane surface) of the support layer laminated on the waterproof sound-transmitting membrane 1mm 2 Above, more preferably 5mm 2 The above.
On the other hand, in order to contribute to downsizing of the electric product by saving space and to reduce the load on the frame body by reducing the force required for compression, the area of the support layer laminated on the waterproof sound-transmitting film is preferably 50mm 2 Hereinafter, more preferably 30mm 2 The following is given.
3. Sound-transmitting region
In the waterproof sound-transmitting member composed of the waterproof sound-transmitting film and the support layer laminated on the peripheral edge portion thereof, sound passes through the portion where the waterproof sound-transmitting film is exposed without laminating the support layer, that is, the sound-transmitting area of the waterproof sound-transmitting film.
Since the wider the sound-transmitting region is, the smaller the acoustic loss is, the area of the sound-transmitting region is preferably 0.5mm 2 The above is more preferably 1.5mm 2 The above. On the other hand, the smaller the area, the more stable the shape, the more difficult the deformation, and the smaller the acoustic loss during compression, and therefore, the area of the sound-transmitting region is preferably 40mm 2 Hereinafter, more preferably 20mm 2 The following is given.
Since the shape of the circular or nearly circular shape is stable and is difficult to deform for the planar shape of the sound-transmitting region, the roundness calculated by the expression (1) is preferably 0.45 to 1, more preferably 0.6 to 1. In addition, it is preferable that the angle is not provided.
(mathematics 1)
Roundness = 4 x circumference ratio x area ∈perimeter] 2 Mathematical formula (1)
Fig. 2 shows an example of the structure of the waterproof sound-transmitting member of the present invention. The waterproof sound-transmitting member 1 of the present invention is preferably circular, and the support layer 3 is laminated on one or both surfaces of the waterproof sound-transmitting membrane 2 so as to be formed on the periphery of the sound-transmitting region 4.
Examples
Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples. The physical properties of the examples and comparative examples were measured and evaluated by the following methods.
(1) Acoustic loss
Sound loss measurement will be described with reference to fig. 3. In the sound-deadening box 16, a sound of 94dB including a sound pressure of 1kHz is emitted from the speaker 11 as a TSP signal, the output of the MEMS (ADMP 401) analog microphone 12 incorporated in the microphone tool 13 is converted into a digital signal by an analyzer, and the digital signal is analyzed by analysis software (CL IO Pocket manufactured by audioica corporation), and the sound pressure level of 1kHz is measured.
The microphone tool 13 is a metallic box-shaped member, has an opening 14 for sound to enter provided on the outer surface, has a waterproof sound-transmitting member mounting portion having a predetermined gap, has an inner space 15 sealed by mounting the waterproof sound-transmitting member 1, and has the MEMS microphone 12 disposed in the inner space 15.
The speaker 11, the opening 14, the waterproof sound-transmitting member 1, and the MEMS microphone 12 are arranged on a straight line so as not to be shielded by the structure of the microphone tool 13. The opening 14 is circular with a diameter of 1mm, the distance from the waterproof sound-transmitting member 1 of the internal space 15 to the MEMS analog microphone 12 is 6mm, and the volume of the internal space is 27mm 3 。
The microphone tool 13 is disposed at a distance of 4.5cm from the speaker 11 so that the plane provided with the opening 14 is parallel to the sound emitting portion of the speaker (so that sound is perpendicularly incident).
The difference between the sound pressure level measured by the microphone tool alone and the sound pressure level measured by attaching a waterproof sound-transmitting member to the opening of the microphone tool was calculated as an acoustic loss. The lower the acoustic loss, the higher the sound permeability.
The gap of the waterproof sound-transmitting member mounting portion was appropriately adjusted, and the acoustic loss of the waterproof sound-transmitting member at a compression ratio of 0% and the acoustic loss of the waterproof sound-transmitting member at a compression ratio of 40% were measured, respectively. The sound loss of compression ratio 0% was subtracted from the sound loss of compression ratio 40%, and Δdbv was calculated. The smaller the value, the more the increase in acoustic loss due to compression can be suppressed. Measurements were performed on 10 samples and the mean and standard deviation were calculated.
(2) Tensile test
Test pieces 50mm in width by 80mm in length were mounted on a tensile tester (trade name: autograph AG-IS, manufactured by Shimadzu corporation) at a gap of 50mm, and tensile test was performed at a tensile speed of 150 mm/min. The measured temperature was 22℃and the measured humidity was 65%. Dividing the initial slope of the resulting stress-strain curve by the cross-sectional area (mm) of the waterproof sound-transmitting membrane 2 ) The tensile elastic modulus (MPa) was calculated. The test pieces were subjected to the above measurement 5 times each by changing the longitudinal direction and the transverse direction by 90 °, and the average value was obtained by performing the above measurement 10 times in total.
(3) Water pressure resistant
The measurement was carried out in accordance with JIS L1092B method (high water pressure method). However, since the area of measurement of the waterproof sound-transmitting member is insufficient, the waterproof sound-transmitting member is stuck to the SUS plate having the circular hole formed therein to measure, and the determination of water leakage is performed at one point. In order to prevent breakage due to deformation of the membrane during measurement of the waterproof sound-transmitting membrane, a plain weave fabric which is overlapped on the side opposite to the side to which the water pressure is applied and hardly affects the water pressure resistance of the porous membrane was measured. The plain weave fabric was woven using 6 nylon multifilament yarns of 80dtex/24 filaments for the warp yarns and 80dtex/34 filaments for the weft yarns, with a warp density of 120/2.54 cm and a weft density of 90/2.54 cm.
(4) Thickness of (L)
The thickness of the waterproof sound-transmitting member was measured by taking a photograph of a vertical cross section 300 to 5000 times using a scanning electron microscope (S-3000N manufactured by Hitachi Ltd.).
(5) Compressive stress
The waterproof sound-transmitting member 1 used in the example was set as shown in fig. 4 by using a compression tester (KES-G5 manufactured by kato tech corporation), and the parallel plate 17 was moved in the compression direction 18 (direction perpendicular to the membrane surface of the waterproof sound-transmitting membrane) and a load was applied. The stress was calculated by measuring the force required to compress 40% of the maximum thickness of the waterproof sound-transmitting member (the sum of the thicknesses of the support layer and the waterproof sound-transmitting film) divided by the area of the support layer (the area overlapping in the vertical direction). The measuring part uses 2cm 2 Is compressed at a speed of 0.01mm/min. The measurement was performed on 5 samples, and an average value was obtained.
The cushioning material, the double-sided adhesive waterproof tape, and the nonporous PET film used for the support layer were each cut into 2.5mm×2.5 mm=6.25 mm pieces in advance 2 Their respective compressive stresses were measured. Each measurement was performed on 5 samples, and an average value was obtained.
In addition, since the sample itself using only the nonporous PET as the nonporous PET or the core material is difficult to compress by 40%, it is difficult to obtain a sample size of 6.25mm 2 The upper measurement limit of (2) is 1569kPa or more.
Examples (example)
A polyurethane resin solution consisting of the following formulation was prepared.
< prescription >
MP865 PS;100 parts by mass
(polyurethane resin, 30% by mass of solid content, 100% modulus 11MPa, manufactured by DIC Co., ltd.)
LEATHEROID LU2850M;65 parts by mass
(silica microparticle Dispersion, manufactured by Dai Kagaku Co., ltd., solid content 20% by mass)
Shellac black L1584;4 parts by mass
(DIC Co., ltd., black pigment, solid content 25% by mass)
N, N-dimethylformamide; 28 parts by mass
Next, the polyurethane resin solution was applied to a release substrate using a roll coater at a thickness of 30 μm of the resulting waterproof sound-transmitting film. Then, it was immersed in water at 20℃for 1.5 minutes to be completely coagulated. Then, the film was washed with warm water at 50℃for 5 minutes, and then heat-treated at 130℃for 2 minutes to dry the film, thereby removing the release substrate and obtaining a waterproof sound-transmitting film. The tensile elastic modulus of the waterproof sound-transmitting film was measured and found to be 3.9MPa, water pressure resistance was 70kPa, and air permeability was 19 seconds/100 mL.
The waterproof sound-transmitting film was die-cut into a rectangle having a long side length of 4.4mm and a short side length of 3.4mm using a thomson die. The support layer was die-cut using a thomson die to form a rectangle having a long side length of 4.4mm and a short side length of 3.4mm, and an elliptical opening having a major axis diameter of 2.4mm and a minor axis diameter of 1.4mm was formed at the center.
The support layer used was a double-sided adhesive tape 1 (trade name "5225VSB", manufactured by Seattle chemical Co., ltd.; porous polyethylene; thickness 250 μm) and a double-sided adhesive tape 2 (trade name "5240VSB", manufactured by Seattle chemical Co., ltd.; porous polyethylene; thickness 400 μm).
The waterproof sound-transmitting member was produced by laminating and pressure-bonding the double-sided adhesive waterproof tape 1, the waterproof sound-transmitting film, and the double-sided adhesive waterproof tape 2 in this order. The thickness of the waterproof sound-transmitting member was 680 μm. The area of the sound-transmitting region was 2.64mm 2 The roundness was 0.9, and the area of the supporting layer was 12.3mm 2 。
The stress required for compressing the 40% double-sided adhesive waterproof tape 1 was 111kPa, and the stress required for compressing the 40% double-sided adhesive waterproof tape 2 was 175kPa. The double-sided adhesive waterproof tape 1 was 36.8% of the entire thickness of the waterproof sound-transmitting member, and the double-sided adhesive waterproof tape 2 was 58.8% of the entire thickness of the waterproof sound-transmitting member, accounting for 95.6% in total.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
By making the waterproof sound-transmitting member with a small stress required for compression of 40%, the acoustic loss is hardly increased even if the waterproof sound-transmitting film with a low tensile elastic modulus is used for compression of 40%.
Example 2
A waterproof and sound-transmitting member was produced in the same manner as in example 1, except that the support layer was a double-sided adhesive waterproof tape 1 (manufactured by Seattle chemical Co., ltd., trade name "5225VSB"; thickness 250 μm), a double-sided adhesive waterproof tape 3 (manufactured by Nidong electric Co., ltd., trade name "No.5601"; non-porous PET; thickness 10 μm) two layers, a cushioning material 1 (manufactured by Kyowa-ter Co., ltd., INOAC CORPORATION; trade name "PORON SR-S15P"; porous polyurethane resin+PET; thickness 500 μm), and the double-sided adhesive waterproof tape 1, the waterproof and sound-transmitting film, the double-sided adhesive waterproof tape 3, the cushioning material 1, and the double-sided adhesive waterproof tape 3 were laminated in this order. The thickness of the waterproof sound-transmitting member was 800 μm.
The stress required for compressing the 40% double-sided adhesive waterproof tape 1 was 111kPa, and the stress required for compressing the 40% cushioning material 1 was 0.2kPa. Further, since the core material of the double-sided adhesive tape 3 is nonporous PET, it is difficult to compress 40% itself, and therefore it is apparent that the stress required for compressing 40% of the double-sided adhesive tape 3 is at least 6.25mm in sample size 2 The upper measurement limit of (2) is 1569kPa or more.
The double-sided adhesive waterproof tape 1 was 31.2% of the entire thickness of the waterproof sound-transmitting member, and the cushioning material 1 was 62.5% of the entire thickness of the waterproof sound-transmitting member, accounting for 93.7% in total.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
By making the waterproof sound-transmitting member with a small stress required for compression of 40%, the acoustic loss is hardly increased even if the waterproof sound-transmitting film with a low tensile elastic modulus is used for compression of 40%.
Example 3
A waterproof and sound-transmitting member was produced in the same manner as in example 1, except that the support layer was a double-sided adhesive waterproof tape 1 (trade name "5225VSB", manufactured by Seiko chemical Co., ltd., thickness 250 μm), a double-sided adhesive waterproof tape 3 (trade name "No.5601", manufactured by Nidong electric Co., ltd.; thickness 10 μm) 2 layer, a cushioning material 2 (trade name "PORON SR-S40P", manufactured by Kyowa Co., ltd., INOAC CORPORATION; porous polyurethane resin+PET; thickness 400 μm), and the double-sided adhesive waterproof tape 1, the waterproof and sound-transmitting film, the double-sided adhesive waterproof tape 3, the cushioning material 2, and the double-sided adhesive waterproof tape 3 were laminated in this order. The thickness of the waterproof sound-transmitting member was 700 μm.
The stress required for compressing the 40% double-sided adhesive waterproof tape 1 was 111kPa, and the stress required for compressing the 40% cushioning material 2 was 1kPa. The stress required for the double-sided adhesive waterproof tape 3 to be compressed by 40% is 1569kPa or more. The double-sided adhesive waterproof tape 1 was 35.7% of the entire thickness of the waterproof sound-transmitting member, and the cushioning material 2 was 57.1% of the entire thickness of the waterproof sound-transmitting member, accounting for 92.8% in total.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
By manufacturing the waterproof sound-transmitting member with a small stress required for compression of 40%, acoustic loss is hardly increased even if 40% compression is performed using the waterproof sound-transmitting film with a low tensile elastic modulus.
Example 4
A waterproof and sound-transmitting member was produced in the same manner as in example 1, except that the support layer was a double-sided adhesive waterproof tape 1 (trade name "5225VSB" manufactured by water chemical industry co., ltd.; thickness 250 μm), a double-sided adhesive waterproof tape 3 (trade name "No.5601" manufactured by niton electric co., ltd., thickness 10 μm) 2 layer and a buffer material 3 (trade name "ISR-ACF-TH" manufactured by rock Gu Chanye co., ltd.; thickness 400 μm), and the double-sided adhesive waterproof tape 1, the waterproof and sound-transmitting film, the double-sided adhesive waterproof tape 3, the buffer material 3, and the double-sided adhesive waterproof tape 3 were laminated in this order. The thickness of the waterproof sound-transmitting member was 700 μm.
The stress required for compressing the 40% double-sided adhesive waterproof tape 1 was 111kPa, and the stress required for compressing the 40% cushioning material 3 was 2kPa. The stress required for the double-sided adhesive waterproof tape 3 to be compressed by 40% is 1569kPa or more. The double-sided adhesive waterproof tape 1 was 35.7% of the entire thickness of the waterproof sound-transmitting member, and the cushioning material 3 was 57.1% of the entire thickness of the waterproof sound-transmitting member, accounting for 92.8% in total.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
By manufacturing the waterproof sound-transmitting member with a small stress required for compression of 40%, acoustic loss is hardly increased even if 40% compression is performed using the waterproof sound-transmitting film with a low tensile elastic modulus.
Example 5
A waterproof sound-transmitting member was produced in the same manner as in example 1, except that the waterproof sound-transmitting film was made into a circular shape having a diameter of 4mm, the support layer was made into a circular shape having a circular opening having a diameter of 2.2mm at the center, and a double-sided adhesive waterproof tape 4 (product name "No.5615" manufactured by Nito electric Co., ltd., thickness of 150 μm), a double-sided adhesive waterproof tape 5 (product name "No.5605" manufactured by Nito electric Co., ltd., thickness of 50 μm) 2 layers, a buffer material 2 (product name "POON SR-S40P" manufactured by Kyowa-Co., ltd., thickness of INOAC CORPORATION; porous polyurethane resin+PET; thickness of 400 μm) and a PET film having a thickness of 50 μm were laminated on the support layer in the order of double-sided adhesive waterproof tape 4, waterproof sound-transmitting film, double-sided adhesive waterproof tape 5, PET film, double-sided adhesive waterproof tape 5 and buffer material 2. The thickness of the waterproof sound-transmitting member was 730 μm. The area of the sound-transmitting region was 3.8mm 2 Roundness of 1, area of the supporting layer of 8.8mm 2 。
The stress required to compress the cushioning material 2 by 40% is 1kPa. The stress required for compression of 40% by PET film having a thickness of 50 μm in the double-sided adhesive waterproof tape 4, the double-sided adhesive waterproof tape 5, and the like is 1569kPa or more, respectively. The cushioning material 2 occupies 54.8% of the entire thickness of the waterproof sound-transmitting member.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
By manufacturing the waterproof sound-transmitting member with a small stress required for compression of 40%, acoustic loss is hardly increased even if 40% compression is performed using the waterproof sound-transmitting film with a low tensile elastic modulus.
Example 6
A waterproof sound-transmitting member was produced in the same manner as in example 5, except that the support layer was formed in a circular shape having a diameter of 6mm and a circular opening portion having a diameter of 2.2mm was provided at the center thereof. Waterproof sound-transmitting structureThe thickness of the piece was 730 μm. The area of the sound-transmitting region was 3.8mm 2 Roundness of 1, area of the supporting layer of 24.5mm 2 。
The stress required to compress the cushioning material 2 by 40% is 1kPa. The cushioning material 2 occupies 54.8% of the entire thickness of the waterproof sound-transmitting member.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
By manufacturing the waterproof sound-transmitting member with a small stress required for compression of 40%, acoustic loss is hardly increased even if 40% compression is performed using the waterproof sound-transmitting film with a low tensile elastic modulus.
Example 7
A waterproof and sound-transmitting member was produced in the same manner as in example 5, except that a double-sided adhesive waterproof tape 4 (trade name "No.5615" manufactured by Nito electric Co., ltd.; thickness of 150 μm), a double-sided adhesive waterproof tape 5 (trade name "No.5605" manufactured by Nito electric Co., ltd.; thickness of 50 μm) 2 layers, a buffer material 4 (trade name "PORON SR-S20P" manufactured by Nito electric Co., ltd.; INOAC CORPORATION; porous polyurethane+PET; thickness of 400 μm), and a PET film having thickness of 50 μm were laminated in this order. The thickness of the waterproof sound-transmitting member was 730 μm.
The stress required to compress the 40% cushioning member 4 was 0.2kPa. The cushioning material 4 occupies 54.8% of the entire thickness of the waterproof sound-transmitting member.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
By manufacturing the waterproof sound-transmitting member with a small stress required for compression of 40%, acoustic loss is hardly increased even if 40% compression is performed using the waterproof sound-transmitting film with a low tensile elastic modulus.
Example 8
An anti-blocking layer was produced in the same manner as in example 7, except that the supporting layer was formed in a circular shape having a diameter of 6mm and a circular opening having a diameter of 2.2mm was formed in the center thereofA water-permeable sound member. The thickness of the waterproof sound-transmitting member was 730 μm. The area of the sound-transmitting region was 3.8mm 2 Roundness of 1, area of the supporting layer of 24.5mm 2 。
The stress required to compress the 40% cushioning member 4 was 0.2kPa. The cushioning material 4 occupies 54.8% of the entire thickness of the waterproof sound-transmitting member.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
By manufacturing the waterproof sound-transmitting member with a small stress required for compression of 40%, acoustic loss is hardly increased even if 40% compression is performed using the waterproof sound-transmitting film with a low tensile elastic modulus.
Example 9
A waterproof sound-transmitting member was produced in the same manner as in example 1, except that the support layer was a double-sided adhesive waterproof tape 1 (trade name "5225VSB" manufactured by water chemical industry co., ltd.; thickness 250 μm) and a double-sided adhesive waterproof tape 6 (trade name "5230VSB" manufactured by water chemical industry co., ltd.; porous polyethylene; thickness 300 μm) were laminated in this order. The thickness of the waterproof sound-transmitting member was 580 μm.
The stress required to compress the 40% double-sided adhesive waterproof tape 6 was 234kPa. The stress required for the double-sided adhesive tape 1 to compress 40% was 111kPa. The double-sided adhesive waterproof tape 6 was 51.7% of the entire thickness of the waterproof sound-transmitting member, and the double-sided adhesive waterproof tape 1 was 43.1% of the entire thickness of the waterproof sound-transmitting member, accounting for 94.8% in total.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
By manufacturing the waterproof sound-transmitting member with a small stress required for compression of 40%, acoustic loss is hardly increased even if 40% compression is performed using the waterproof sound-transmitting film with a low tensile elastic modulus.
Comparative example 1
A waterproof sound-transmitting member was produced in the same manner as in example 1, except that the support layer was a double-sided adhesive waterproof tape 7 (product name "5230SKB" manufactured by water chemical industry co., ltd.; porous polyethylene; thickness 300 μm) and a double-sided adhesive waterproof tape 8 (product name "5225SKB" manufactured by water chemical industry co., ltd.; porous polyethylene; thickness 250 μm) were laminated in this order. The stress required for the double-sided adhesive waterproof tape 7 to compress 40% was 780kPa. The stress required to compress the 40% double-sided adhesive waterproofing tape 8 was 682kPa. The thickness of the waterproof sound-transmitting member was 580 μm.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
Since the stress required for 40% compression is large, when 40% compression is performed using a waterproof sound-transmitting film having a low tensile elastic modulus, the acoustic loss increases, and the film is not suitable for use under compression.
Comparative example 2
A waterproof sound-transmitting member was produced in the same manner as in example 1, except that a double-sided adhesive waterproof tape 7 (trade name "5230SKB", manufactured by water chemical industry co., ltd.; porous polyethylene; thickness 300 μm) 2 layers were used as the support layer, and the double-sided adhesive waterproof tape 7, the waterproof sound-transmitting film, and the double-sided adhesive waterproof tape 7 were laminated in this order. The stress required for the double-sided adhesive waterproof tape 7 to compress 40% was 780kPa. The thickness of the waterproof sound-transmitting member was 630 μm.
The measurement results of acoustic loss, water pressure resistance, and stress required for 40% compression for the waterproof sound-transmitting member with compression ratios of 0% and 40% are shown in table 1.
Since the stress required for 40% compression is large, when 40% compression is performed using a waterproof sound-transmitting film having a low tensile elastic modulus, the acoustic loss increases, and the film is not suitable for use under compression.
In addition, the details of the materials used in the above examples and comparative examples are as follows.
Double-sided adhesive waterproof tape 1; trade name "5225VSB" (porous polyethylene: thickness 250 μm) manufactured by water chemical industry Co., ltd.)
Double-sided adhesive waterproof tape 2; trade name "5240VSB" (porous polyethylene: thickness 400 μm) manufactured by water chemical industry Co., ltd.)
Double-sided adhesive waterproof tape 3; nidong electric company trade name "No.5601" (nonporous PET film: thickness 10 μm)
Double-sided adhesive waterproof tape 4; manufactured by Nidong electric company, trade name "No.5615" (nonporous PET film: thickness 150 μm)
Double-sided adhesive waterproof tape 5; nidong electric company trade name "No.5605" (nonporous PET film: thickness 50 μm)
Double-sided adhesive waterproof tape 6; trade name "5230VSB" (porous polyethylene: thickness 300 μm) manufactured by water chemical industry Co., ltd.)
Double-sided adhesive waterproof tape 7; water chemical industry Co., ltd., trade name "5230SKB" (porous polyethylene: thickness 300 μm)
Double-sided adhesive waterproof tape 8; trade name "5225SKB" (porous polyethylene: thickness 250 μm) manufactured by Seama chemical Co., ltd.)
Buffer material 1; trade name "PORON SR-S15P" (porous polyurethane resin 450 μm+non-porous PET50 μm: total thickness 500 μm) manufactured by Kyowa Co., ltd.)
Buffer material 2; trade name "PORON SR-S40P" (porous polyurethane resin 350 μm+non-porous PET50 μm: total thickness 400 μm) manufactured by Kyowa Co., ltd.)
Buffer material 3; rock Gu Chanye Co., ltd., trade name "ISR-ACF-TH" (porous acrylic resin; thickness 400 μm)
Buffer material 4; trade name "PORON SR-S20P" (porous polyurethane resin 350 μm+non-porous PET50 μm: total thickness 400 μm) manufactured by Kyowa Co., ltd.)
The double-sided adhesive waterproof tapes 1, 2, 6 and the cushioning materials 1, 2, 3, 4 correspond to "a sheet material requiring a stress of 600kPa or less for 40% compression in the vertical direction" of the present invention. The double-sided adhesive waterproof tapes 3, 4, 5 correspond to spacer layers.
TABLE 1
Industrial applicability
The waterproof sound-transmitting member of the present invention has high waterproof performance, and even if it is used in compression to prevent interference of sound in a housing, acoustic loss is low, and acoustic characteristics of a microphone and a speaker are not impaired. Therefore, the waterproof sound-transmitting member of the present invention can be suitably used for waterproof protection of microphones and speakers of electrical appliances.
Description of the reference numerals
1: waterproof sound-transmitting member
2: waterproof sound-permeable membrane
3: support layer
4: sound-transmitting region
11: loudspeaker
12: MEMS analog microphone
13: microphone tool
14: an opening part
15: interior space
16: noise elimination box
17: parallel plate
18: compression direction
Claims (13)
1. A waterproof sound-transmitting member, wherein a support layer is laminated on at least one surface of a waterproof sound-transmitting film,
the waterproof sound-transmitting membrane has sound-transmitting areas with both surfaces exposed, and the stress required for 40% compression in the direction perpendicular to the membrane surface of the waterproof sound-transmitting membrane is 1-600 kPa.
2. The waterproof sound-transmitting member according to claim 1, wherein,
support layers are laminated on both sides of the waterproof sound-transmitting membrane.
3. The waterproof sound-transmitting member according to claim 1 or 2, wherein,
the support layer is composed of a single layer or a plurality of layers, and at least comprises a layer using a sheet material having a stress of 600kPa or less required to be compressed by 40% in the vertical direction.
4. A waterproof sound-transmitting member according to claim 3,
the sheet having a stress of 600kPa or less required for 40% compression in the vertical direction includes a sheet layer made of a synthetic resin porous material.
5. The waterproof sound-transmitting member according to claim 4, wherein,
The synthetic resin porous material is a synthetic resin porous material selected from the group consisting of polyolefin resins, urethane resins, and acrylic resins.
6. The waterproof sound-transmitting member according to any one of claims 3 to 5, wherein,
among the layers constituting the support layer, a layer using a sheet having a stress of 600kPa or less required for compression of 40% in the vertical direction occupies 40% or more of the entire thickness of the waterproof sound-transmitting member.
7. The waterproof sound-transmitting member according to any one of claims 1 to 6, wherein,
the tensile elastic modulus of the waterproof sound-transmitting film is 0.5 MPa-20 MPa.
8. The waterproof sound-transmitting member according to any one of claims 1 to 7, wherein,
the waterproof sound-transmitting film contains 100% of material with modulus of 1-20 MPa.
9. The waterproof sound-transmitting member according to any one of claims 1 to 8, wherein,
the waterproof sound-transmitting film is composed of polyurethane resin.
10. The waterproof sound-transmitting member according to any one of claims 1 to 9, wherein,
the area of the supporting layer laminated on at least one surface of the waterproof sound-transmitting membrane is 1mm 2 ～50mm 2 。
11. The waterproof sound-transmitting member according to any one of claims 1 to 10, wherein,
The planar shape of the sound-transmitting region has no angle and the roundness is 0.45 to 1.
12. The waterproof sound-transmitting member according to any one of claims 1 to 11, wherein,
the area of the sound-transmitting region was 0.5mm 2 ～40mm 2 。
13. The waterproof sound-transmitting member according to any one of claims 1 to 12, wherein,
a support layer is laminated on the periphery of the waterproof sound-transmitting membrane.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-031996 | 2021-03-01 | ||
| JP2021031996 | 2021-03-01 | ||
| PCT/JP2022/008159 WO2022186105A1 (en) | 2021-03-01 | 2022-02-28 | Water-resistant sound transmitting member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116888977A true CN116888977A (en) | 2023-10-13 |
Family
ID=83154420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280016518.7A Pending CN116888977A (en) | 2021-03-01 | 2022-02-28 | Waterproof sound-transmitting member |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2022186105A1 (en) |
| CN (1) | CN116888977A (en) |
| WO (1) | WO2022186105A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024142950A1 (en) * | 2022-12-28 | 2024-07-04 | 日東電工株式会社 | Waterproof member, waterproof case, and electronic apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10219054B2 (en) * | 2012-05-31 | 2019-02-26 | Nitto Denko Corporation | Protective member for acoustic component and waterproof case |
| JP6588828B2 (en) * | 2014-01-13 | 2019-10-09 | セーレン株式会社 | Sound-permeable waterproof membrane and manufacturing method thereof |
| JP7079261B2 (en) * | 2017-11-09 | 2022-06-01 | 日東電工株式会社 | Waterproof sound-transmitting material and electronic devices equipped with it |
-
2022
- 2022-02-28 JP JP2023503798A patent/JPWO2022186105A1/ja active Pending
- 2022-02-28 WO PCT/JP2022/008159 patent/WO2022186105A1/en active Application Filing
- 2022-02-28 CN CN202280016518.7A patent/CN116888977A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022186105A1 (en) | 2022-09-09 |
| JPWO2022186105A1 (en) | 2022-09-09 |
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