WO2014080574A1 - 通音構造、通音膜、及び防水ケース - Google Patents
通音構造、通音膜、及び防水ケース Download PDFInfo
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- WO2014080574A1 WO2014080574A1 PCT/JP2013/006351 JP2013006351W WO2014080574A1 WO 2014080574 A1 WO2014080574 A1 WO 2014080574A1 JP 2013006351 W JP2013006351 W JP 2013006351W WO 2014080574 A1 WO2014080574 A1 WO 2014080574A1
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- Prior art keywords
- sound
- permeable membrane
- membrane
- passage
- support material
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- 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
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/023—Screens for loudspeakers
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- 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
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- 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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
-
- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
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- 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
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
- H04R1/086—Protective screens, e.g. all weather or wind screens
-
- 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
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/02—Cellular or porous
- B32B2305/026—Porous
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/402—Coloured
- B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/51—Elastic
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
-
- 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
- B32B2457/00—Electrical equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
Definitions
- the present invention relates to a sound permeable membrane, a sound permeable structure including the sound permeable membrane, and a waterproof case including the sound permeable membrane.
- a sounding unit such as a speaker or a buzzer, or a sound receiving unit such as a microphone is arranged, and the sounding unit or sound receiving unit of the housing of the electronic device is arranged.
- An opening is provided at a corresponding position. Sound is transmitted through this opening.
- a sound-permeable membrane that allows passage of sound and prevents passage of foreign matter is disposed so as to block the opening.
- a plastic porous membrane in which a polytetrafluoroethylene (hereinafter sometimes referred to as “PTFE”) film or an ultrahigh molecular weight polyethylene film is made porous is known (see Patent Document 1).
- Patent Document 1 proposes a sound-permeable membrane in which a support is bonded to a plastic porous membrane in consideration of the ease of secondary processing of the sound-permeable membrane such as cutting, punching, and adhesion to a case. .
- the support include nets, nonwoven fabrics, and woven fabrics.
- Patent Document 1 proposes a sound-permeable membrane in which a support is bonded to a plastic porous membrane and the surface density is in a predetermined range so that the sound-permeable property of the sound-permeable membrane does not deteriorate.
- Patent Document 2 proposes a waterproof sound-permeable membrane that is a laminate composed of a plastic membrane and a support.
- the support include porous bodies such as nets, foam rubber, and sponge sheets, nonwoven fabrics, and woven fabrics.
- Patent Document 3 proposes an acoustic component having a waterproof filter (waterproof sound-permeable membrane) mounted so as to cover the sound-transmitting hole of the housing via an adhesive layer.
- a waterproof filter waterproof sound-permeable membrane
- An object of the present invention is to provide a sound-permeable structure or a waterproof case provided with a sound-permeable membrane that exhibits good acoustic characteristics in a high-frequency region while using a nonwoven fabric as a support. It is another object of the present invention to provide a sound-permeable film that is excellent in liquid repellency or durability in addition to acoustic characteristics.
- the present invention A sound-permeable membrane that allows passage of sound while preventing passage of foreign matter, and a support material that is a nonwoven fabric containing an elastomer, and a resin porous material that is laminated on the support material and contains polytetrafluoroethylene as a main component
- a sound-permeable membrane having a membrane A case having a sound passage opening,
- the sound-transmitting membrane provides a sound-transmitting structure that closes the sound-transmitting opening by the support material being welded to the case.
- the present invention also provides: A sound-permeable membrane that blocks the passage of foreign objects while allowing the passage of sound, A support material that is a nonwoven fabric containing an elastomer; A resin porous membrane having polytetrafluoroethylene as a main component laminated on the support material, Provided is a sound-permeable membrane in which the surface of the support material is coated with a liquid repellent.
- the present invention also provides: A sound-permeable membrane that blocks the passage of foreign objects while allowing the passage of sound, A support material that is a nonwoven fabric containing an elastomer; A resin porous membrane having polytetrafluoroethylene as a main component laminated on the support material, 60 minutes by continuously applying 50 kPa of water pressure to the sound-permeable membrane from the side joined to the plate material in a state where the peripheral portion of the sound-permeable membrane is joined to the plate material so as to close the through-hole of the plate material having a through-hole.
- the maximum displacement amount of the sound-permeable membrane from the plane including the peripheral portion at the time when the passage has passed is H1, and then the passage from the plane including the peripheral portion when 360 minutes have elapsed after standing at atmospheric pressure.
- Recovery rate R (1 ⁇ (H2 / H1)) ⁇ 100
- the present invention also provides: A sound-permeable membrane that allows passage of sound while preventing passage of foreign matter, and a support material that is a nonwoven fabric containing an elastomer, and a resin porous material that is laminated on the support material and contains polytetrafluoroethylene as a main component
- a sound-permeable membrane having a membrane A case including a frame having a sound passage opening and an operation opening, and an elastic transparent film attached to the frame so as to close the operation opening,
- the sound-permeable membrane provides a waterproof case attached to the case so as to close the sound-permeable opening.
- a sound-permeable membrane using a nonwoven fabric containing an elastomer as a support material can reduce insertion loss with respect to a sound of 3000 Hz as compared with a sound-permeable membrane using another nonwoven fabric as a support material. For this reason, it is possible to provide a sound transmission structure and a waterproof case provided with a sound transmission film exhibiting good acoustic characteristics in a high frequency region.
- the sound transmission structure of the present invention since the sound transmission opening is blocked by the support material being welded to the case, it is not necessary to provide an adhesive layer between the sound transmission film and the case.
- the electronic device can be used in an environment where waterproofing is required by housing the electronic device such as a mobile phone inside the waterproof case.
- the electronic device can be operated through an elastic transparent film attached to the frame so as to close the operation opening.
- the sound-permeable membrane of one embodiment of the present invention has excellent liquid repellency because the surface of the support material is coated with the liquid repellent.
- the sound-permeable membrane of another aspect of the present invention is deformed by water pressure, the deformation of the sound-permeable membrane is likely to be eliminated when the sound-permeable membrane is subsequently released from the water pressure. For this reason, even if water pressure is repeatedly applied to the sound-permeable membrane, the sound-permeable membrane can be used continuously and has excellent durability.
- Sectional drawing which shows one Embodiment of the sound-permeable film of this invention Sectional drawing which shows other embodiment of the sound-permeable film of this invention.
- the perspective view which shows an example of embodiment of the sound-permeable member of this invention Sectional drawing which shows the sound-permeable structure of this invention Schematic diagram showing the method of welding the sound-permeable membrane Front view of the waterproof case of the present invention Rear view of the waterproof case shown in FIG. 5A Sectional view along line AA in FIG. 5A Sectional view along line BB in FIG.
- the sound-permeable membrane 1 of this embodiment includes a support material 12 and a resin porous membrane 11 containing PTFE as a main component.
- the “main component” refers to a component that is contained most in mass ratio.
- the resin porous membrane 11 is laminated on the support material 12.
- the support material 12 is comprised with the nonwoven fabric containing an elastomer.
- the sound-permeable membrane 1 has a characteristic of preventing the passage of foreign matters such as water or dust and allowing gas to permeate due to the porous structure of the resin porous membrane 11.
- the sound-permeable membrane 1 allows passage of sound. For this reason, for example, in an electronic device including a sound generation unit or a sound reception unit, the sound transmission membrane 1 is disposed in an opening of a housing corresponding to the sound generation unit or the sound reception unit. , And preferably used to ensure dust resistance.
- the resin porous membrane 11 is obtained by, for example, extruding and rolling a kneaded product of PTFE fine powder and a molding aid into a sheet shape, removing the molding aid to obtain a molded body, and then forming the sheet body. Can be produced by further stretching.
- the resin porous membrane 11 thus produced has a porous structure in which voids between infinitely formed PTFE fine fibers (fibrils) are pores.
- the average pore diameter and porosity of the porous structure of the resin porous membrane 11 can be adjusted by changing the stretching conditions of the sheet.
- the average pore diameter of the resin porous membrane 11 is preferably 1 ⁇ m or less, more preferably 0.7 ⁇ m or less, and even more preferably 0.5 ⁇ m from the viewpoint of achieving both waterproofness or dustproofness and sound permeability. It is as follows. Although the lower limit of the average pore diameter of the resin porous membrane 11 is not particularly limited, it is, for example, 0.1 ⁇ m.
- the “average pore diameter” of the resin porous membrane 11 can be measured in accordance with the provisions of ASTM (American Testing Materials Association) F316-86. For example, a commercially available measuring apparatus capable of automatic measurement in conformity with this provision ( It can be measured using a Perm-Porometer manufactured by Porous® Material.
- the surface density of the resin porous membrane 11 is preferably 2 to 10 g / m 2 , more preferably 2 to 8 g / m 2 , and further preferably 2 to 5 g / m 2 . is there.
- the resin porous membrane 11 may be colored. Since the main component of the resin porous membrane 11 is PTFE, the original color of the resin porous membrane 11 is white. Therefore, when the resin porous film 11 is disposed so as to close the opening of the housing, the resin porous film 11 is easily noticeable. Thus, the resin porous film 11 is colored according to the color of the casing, whereby the resin porous film 11 that is not noticeable when placed in the casing can be realized.
- the resin porous membrane 11 is colored, for example, black.
- the resin porous film 11 may be subjected to a liquid repellent treatment.
- a porous film excellent in water repellency or oil repellency can be realized.
- Such a porous membrane is suitable for uses such as a sound-permeable membrane having waterproofness.
- the liquid repellent treatment can be realized by a known method.
- the liquid repellent used for the liquid repellent treatment is not particularly limited, and is typically a material containing a polymer having a perfluoroalkyl group.
- the support material 12 only needs to exhibit flexibility so as not to hinder the sound transmission mechanism due to vibration of the resin porous membrane 11, and the elastomer of the support material 12 is desirably a thermoplastic elastomer.
- This thermoplastic elastomer is, for example, a styrene thermoplastic elastomer (SBC), an olefin thermoplastic elastomer (TPO), a vinyl chloride thermoplastic elastomer (TPVC), a urethane thermoplastic elastomer (TPU), or an ester thermoplastic elastomer. (TPEE) or amide-based thermoplastic elastomer (TPAE).
- the support material 12 may be comprised with the nonwoven fabric which consists of elastomers.
- the elastomer of the support material 12 may include at least one selected from an ethylene vinyl acetate elastomer, a polyurethane elastomer, and a polyamide elastomer.
- the support material 12 can be manufactured by the method shown below, for example.
- An elastomer material heated and melted on the release film is applied in a fibrous form to form a nonwoven fabric.
- the release film provides a flat surface for applying the elastomeric material.
- the release film is not particularly limited, but a resin film such as silicone or polyethylene terephthalate may be used.
- the EVA resin is applied by spraying the release film at a high temperature (170 ° C. to 200 ° C.) and a high pressure (2 to 5 kg / cm 2 ).
- the support material 12 can be obtained by peeling the nonwoven fabric from the release film.
- the support material 12 may be subjected to a liquid repellent treatment. That is, the surface of the support material 12 may be coated with a liquid repellent. Thereby, even if the sound-permeable membrane 1 is arrange
- the liquid repellent is not particularly limited, but the liquid repellent includes a linear fluorine-containing hydrocarbon group represented by, for example, —R 1 C 5 F 10 CH 2 C 4 F 9 or —R 2 C 6 F 13 .
- R 1 and R 2 are each independently an alkylene group having 1 to 12 carbon atoms or a phenylene group.
- the polymer which makes at least one part of a monomer can be mentioned.
- R 1 and R 2 are as described above, and R 3 and R 4 are each independently a hydrogen atom or a methyl group.
- the linear fluorine-containing hydrocarbon is CH 2 ⁇ CR 3 COOR 1 C 5 F 10 CH 2 C 4 F 9 or CH 2 ⁇ C (CH 3 ) COOR 2 C.
- the polymer is preferably a polymer having the compound represented by 6 F 13 as at least a part of the monomer.
- the above polymer may be one obtained by polymerizing only the above monomer, or may be one obtained by copolymerizing the above monomer with another monomer.
- the monomer to be copolymerized include various (meth) acrylic monomers, but are not limited thereto, and various monomers having an ethylenically unsaturated bond such as tetrafluoroethylene are used. Also good.
- the ratio of the above-mentioned monomers in the total monomers is 60 mol% or more, particularly 90 mol% or more so as not to hinder the provision of liquid repellency. It is desirable.
- the above-mentioned monomer polymerization method may be a well-known method for acrylic monomer polymerization and can be carried out by solution polymerization or emulsion polymerization.
- the average molecular weight of the above polymer is not particularly limited, but it is about 1000 to 50000, for example, expressed by the number average molecular weight.
- Examples of the method of coating the surface of the support material 12 with a liquid repellent include a method of immersing the support material 12 in a solution in which the liquid repellent is dissolved in a solvent, and a method of applying or spraying the solution onto the support material 12.
- the sound-permeable membrane 1 can be obtained by laminating the support material 12 and the resin porous membrane 11 obtained as described above using, for example, a heating press. Moreover, the sound-permeable membrane 1 obtained by laminating the porous resin film 11 that has not been subjected to the liquid repellent treatment and the support material 12 that has not been subjected to the liquid repellent treatment has been exemplified as the liquid repellent of the support material 12.
- the resin porous film 11 and the support material 12 may be subjected to a liquid repellent treatment by immersing in a solution containing a liquid repellent. Thereby, the surface of the support material 12 can be covered with the liquid repellent.
- the surface density of the sound-permeable membrane 1 is preferably 5 to 50 g / m 2 , more preferably 5 to 30 g / m 2 , and still more preferably 5 to 15 g / m 2 . .
- the sound-permeable membrane 1 exhibits acoustic characteristics that the insertion loss with respect to the sound of 3000 Hz is 5 dB or less with respect to the insertion loss. For this reason, although the sound-permeable membrane 1 has a structure in which the porous resin film 11 is laminated on the support material 12 including the nonwoven fabric, it has good acoustic characteristics with low insertion loss in a relatively high frequency region. .
- the insertion loss is the difference between the sound pressure level when the sound-permeable membrane 1 is present in the path through which sound is transmitted and the sound pressure level when the sound-permeable film 1 is not present in the path through which sound is transmitted.
- the sound-permeable membrane 1 exhibits acoustic characteristics in which the ratio of the insertion loss of 3000 Hz sound to the loss loss of 1000 Hz sound is 1.0 to 2.0. For this reason, the sound-permeable membrane 1 can show the same level of insertion loss for both the 1000 Hz sound and the 3000 Hz sound.
- the ratio of the insertion loss of 3000 Hz sound to the loss loss of 1000 Hz sound indicated by the sound-permeable membrane 1 is preferably 1.0 to 1.5, and more preferably 1.0 to 1.2.
- the sound-permeable membrane 1 exhibits acoustic characteristics such that the difference between the maximum value and the minimum value of insertion loss for sound of 100 Hz to 4000 Hz is 5 dB or less. For this reason, the sound-permeable membrane 1 can exhibit acoustic characteristics with little variation in insertion loss with respect to sound whose frequency region is 100 Hz to 4000 Hz.
- recovery rate R (1 ⁇ (H2 / H1)) ⁇ 100
- H1 continues to apply 50 kPa of water pressure to the sound-permeable membrane 1 from the side joined to the plate material in a state where the peripheral portion of the sound-permeable membrane 1 is joined to the plate material so as to close the through-hole of the plate material having the through-hole.
- This is the maximum amount of displacement from the plane including the peripheral edge of the sound-permeable membrane 1 when a minute has passed.
- H2 is the maximum amount of displacement from the plane including the peripheral portion of the sound-permeable membrane 1 when 360 minutes have passed after being left in the atmospheric pressure state.
- the recovery rate R indicates the ease of recovery of the shape of the sound-permeable membrane 1 that has been deformed by receiving water pressure.
- the sound-permeable membrane 1 Since the sound-permeable membrane 1 has a recovery rate R of 80% or more, the shape is easily recovered even when subjected to water pressure. For this reason, the sound-permeable membrane 1 is excellent in durability because it can be used even when it is repeatedly subjected to water pressure.
- the recovery rate R of the sound-permeable membrane 1 is desirably 90% or more.
- the resin porous membrane 11 of the sound-permeable membrane 1 may have a laminated structure in which, for example, two resin porous membranes are laminated.
- the resin porous membrane 11 has a laminated structure of the first resin porous membrane 11A and the second resin porous membrane 11B.
- each of the first resin porous membrane 11A and the second resin porous membrane 11B has pores between voids of innumerably formed PTFE fibers (fibrils). It has a porous structure.
- 11A of 1st resin porous membranes or the 2nd resin porous membrane 11B may be color-processed by arbitrary colors, and the color process does not need to be performed.
- the first resin porous membrane 11A forming one main surface of the sound-permeable membrane 1 may be colored black, for example. In this case, if the sound-permeable membrane 1 is disposed in the opening of the housing of the electronic device so that the first resin porous membrane 11A faces the outside of the housing, the sound-permeable membrane 1 is hardly noticeable.
- the sound-permeable membrane 1 may have a laminated structure in which three or more resin porous membranes are laminated. In this case, the resin porous membrane forming one main surface of the sound-permeable membrane 1 may be colored according to the color (for example, black) of the casing. Further, the first resin porous film 11A or the second resin porous film 11B may be subjected to a liquid repellent treatment.
- the average pore diameter of each of the first resin porous film 11 ⁇ / b> A and the second resin porous film 11 ⁇ / b> B may be in the range described above as the average pore diameter of the resin porous film 11.
- the average pore diameters of the first resin porous membrane 11A and the second resin porous membrane 11B may be the same or different.
- the surface density of the resin porous membrane 11 formed by laminating a plurality of resin porous membranes is preferably 2 to 10 g / cm 2 , more preferably 2 to 8 g / cm 2 , more preferably 2 to 5 g / cm 2 .
- the resin porous membrane 11 may have a single layer structure as shown in FIG. According to this aspect, the surface density of the sound-permeable membrane 1 can be kept low. For this reason, since sound transmission loss becomes small, the sound permeability of the sound-permeable membrane 1 becomes better.
- the sound-permeable member 3 may be configured by attaching a ring-shaped reinforcing member 14 to the periphery of the sound-permeable film 1.
- the sound-permeable membrane 1 can be reinforced and the sound-permeable member 3 can be easily handled.
- the reinforcing member 14 can be attached to the housing, the work of attaching the sound-permeable membrane 1 to the housing is improved.
- the shape of the reinforcing member 14 is not particularly limited as long as the sound-permeable membrane 1 can be supported.
- the material of the reinforcing member 14 is not particularly limited, and resin, metal, or a composite material thereof can be used.
- the joining method of the sound-permeable membrane 1 and the reinforcing member 14 is not particularly limited, and for example, heat welding, ultrasonic welding, adhesion with an adhesive, and adhesion with a double-sided tape can be employed.
- the electronic device includes a sound generation unit or a sound reception unit.
- a speaker or a buzzer can be used as the sound generation unit.
- a microphone etc. can be mentioned as a sound-receiving part.
- the electronic device has a housing in which an opening is formed so as to correspond to the sound generation unit or the sound receiving unit.
- the above-described sound-transmitting film is arranged so as to close the opening corresponding to the sound generation unit or the sound receiving unit, whereby the electronic apparatus of the present embodiment is configured.
- the sound transmission structure 100 includes the sound transmission membrane 1 and a case 120.
- the case 120 has a sound passage opening 122.
- the sound-permeable membrane 1 closes the sound-permeable opening 122 by the support material 12 being welded to the case.
- the case 120 includes an upper case 120a and a lower case 120b.
- the case 120 is formed by assembling the upper case 120a to the lower case 120b.
- the sound passage opening 122 is formed in the upper case 120a.
- the sound-permeable membrane 1 is welded to the case 120 by a welding device having a fixing base 101, an elastic body 109, a welding horn 104, a heater 105, a temperature controller 108, an air lifter 106, and an air compressor 107.
- the A recess for fixing the upper case 120a is provided in the center of the fixing base 101, and an elastic body 109 is disposed on the bottom surface of the recess.
- An annular convex portion is formed at the tip of the welding horn 104, and this convex surface is a heat welding surface.
- the upper part of the welding horn 104 is fitted in the heater 105, and a temperature controller 108 is connected to the heater 105.
- An air lifter 106 is attached to the welding horn fitted in the heater 105.
- the air lifter 106 is connected to an air compressor 107, and the welding horn 104 is moved up and down using compressed air.
- the welding of the sound-permeable membrane 1 to the case 120 using the above welding apparatus is performed, for example, as follows. First, the elastic body 109 is disposed on the bottom surface of the concave portion of the fixing base 101, and the upper case 120a is fitted and fixed thereon so that the surface having the sound passage opening 122 is in contact with the elastic body 109. Next, the sound-permeable membrane 1 is placed on the sound-permeable opening 122 of the fixed upper case 120a so that the support member 12 contacts the upper case 120a. Further, the welding horn 104 is heated by the heater 105 while the heating temperature is adjusted by the temperature controller 108. The heating temperature is appropriately determined depending on the material of the support member 12 or the material of the upper case 120a.
- the heating temperature is, for example, 120 to 200 ° C.
- the welding horn 104 is lowered by the air lifter 106 and the convex surface of the annular convex portion which is the heat welding surface is pressed against the peripheral portion of the sound film 1, and is heated and pressurized to be connected to the peripheral portion of the sound conductive film 1.
- the outer peripheral edge of the opening 122 is welded.
- the welding horn 104 is raised by the air lifter 106. In this way, the sound transmission structure 100 can be obtained by assembling the upper case 120a with the sound transmission film 1 welded to the lower case 120b.
- the waterproof case includes the above sound-permeable membrane 1 and the case 300.
- the case 300 includes a frame 310 and an elastic transparent film 330.
- the frame 310 has an upper frame 310a and a lower frame 310b.
- the upper frame 310a has a thin plate-like structure with a rectangular outline and a rectangular opening formed in the center.
- the upper frame 310a includes a sound passage opening 322a, a sound passage opening 322b, and an operation opening 311.
- the lower frame 310b has a bottomed box shape with an upper opening, and has a sound passage opening 322c on the bottom surface.
- the elastic transparent film 330 is attached to the upper frame 310 a so as to close the operation opening 311.
- the elastic transparent film 330 is, for example, a polyurethane sheet, a silicone rubber sheet, a styrene elastomer sheet, or a polyisoprene sheet.
- the sound-permeable membrane 1 is joined to the upper frame 310a via a double-sided tape 306 so as to close the sound-permeable opening 322b.
- the sound-permeable membrane 1 is joined to the upper frame 310a via a double-sided tape 306 so as to close the sound-permeable opening 322a.
- the sound-permeable membrane 1 is joined to the lower frame 310b via the double-sided tape 306 so as to close the sound-permeable opening 322c.
- the inside of the case 300 becomes waterproof.
- the electronic device 500 such as a mobile phone is disposed between the upper frame 310a and the lower frame 310b, and the electronic device 500 is accommodated inside the case 300, thereby waterproofing.
- the electronic device 500 can be used in an environment that requires the
- the sound passage opening 322a is located in an area corresponding to the sound passage opening 522a for the speaker of the electronic device 500.
- the sound passage opening 322 b is located in a region corresponding to the microphone sound passage 522 b of the electronic device 500.
- the sound passage opening 322c is located in a region corresponding to the sound passage opening 522c for the speaker of the electronic device 500. Therefore, sound is transmitted between the speaker or microphone of the electronic device 500 and the outside of the case 300 in a state where the electronic device 500 is accommodated in the case 300. Therefore, the user can use the speaker or the microphone of the electronic device 500 in a state where the electronic device 500 is accommodated in the case 300.
- the elastic transparent film 330 is in contact with the electronic device 500 so as to cover the operation keys 510 and the display 530 of the electronic device 500 in a state where the electronic device 500 is accommodated in the case 300.
- the user can operate the operation key 510 through the elastic transparent film 330 and can visually recognize the display 530 through the elastic film 330.
- the display 530 is a touch panel display, the user can operate the display 530 via the elastic transparent film 330. For this reason, the user can operate the electronic device 500 in a state where the electronic device 500 is accommodated in the case 300.
- Air permeability The air permeability of the resin porous membrane or the sound-permeable membrane was evaluated based on the method B (Gurley method) of the air permeability measurement method defined in JIS (Japanese Industrial Standard) L 1096.
- the water pressure resistance of the porous resin membrane or the sound-permeable membrane was measured using a water resistance tester (high water pressure method) described in JIS L 1092: 2009. However, since the resin porous membrane is remarkably deformed in the area of the test piece shown in this regulation, the resin porous membrane is provided by providing a stainless mesh (opening diameter: 2 mm) on the opposite side of the pressure surface of the resin porous membrane. The water pressure resistance of the porous resin membrane was measured in a state where deformation of the resin was suppressed to some extent.
- the peripheral portion of the sound-permeable membrane 1 was reinforced with a ring-shaped reinforcing member 66 made of polyethylene terephthalate (PET).
- the acoustic characteristics of the produced sound-permeable membrane were evaluated as follows. First, as shown in FIG. 9, a polystyrene simulated case 20 (outer dimensions 60 mm ⁇ 50 mm ⁇ 28 mm) imitating the case of a mobile phone was prepared. The simulated housing 20 is provided with one speaker attachment hole 22 having a diameter of 2 mm and one conduction hole 24 of the speaker cable 42, and no other openings were formed. Next, as shown in FIG. 9, a speaker 40 (SCG-16A, manufactured by Star Seimitsu Co., Ltd.) is attached to a urethane sponge filler 30 in which a sound passage hole 32 having a diameter of 5 mm is formed. Enclosed inside. The speaker cable 42 was led out of the simulated housing 20 from the conduction hole 24. Thereafter, the conduction hole 24 was closed with putty.
- SCG-16A manufactured by Star Seimitsu Co., Ltd.
- the sound-permeable membrane 1 according to each example or comparative example, a PET film 5 having a thickness of 0.1 mm, a PET support double-sided tape 6 (Nitto Denko Corporation No. 5603, thickness) : 0.03 mm) and a polyethylene-based foam support material double-sided tape 7 (Nitto Denko Corporation No. 57120B, thickness: 0.20 mm), an evaluation sample punched into an inner diameter of 2.5 mm and an outer diameter of 5.8 mm 10 was produced. Then, this evaluation sample 10 was attached to the outside of the speaker mounting hole 22 of the simulated housing 20.
- the sound-permeable membrane 1 covers the entire speaker mounting hole 22 and does not cause a gap between the double-sided tape 7 and the simulated housing 20 and between the sound-permeable membrane 1 and the double-sided tape 7. Was affixed to the simulated housing 20.
- a microphone 50 (Knowles Acoustic, Spm0405Hd4H-W8) is installed above the sound-permeable membrane 1 so as to cover the sound-permeable membrane 1, and the microphone 50 is connected to an acoustic evaluation device (B & K, Multi-analyzer System 3560). -B-030). The distance between the speaker 40 and the microphone 50 was 21 mm.
- SSR analysis test signal: 20 Hz to 10 kHz, sweep
- the sound pressure level of the blank measured with the through-hole having a diameter of 2.5 mm formed by breaking the sound-permeable membrane 1 was -21 dB at 1000 Hz.
- the insertion loss is automatically obtained from the test signal input to the speaker 40 from the acoustic evaluation device and the signal received by the microphone 50, and the sound-permeable membrane 1 is pasted from the blank sound pressure level. Obtained by subtracting the sound pressure level measured in. It can be determined that the smaller the insertion loss is, the more the volume output from the speaker 40 is maintained.
- the sound-permeable membrane according to the embodiment covers the through hole in the case made of polybutylene terephthalate using the welding apparatus shown in FIG. 4B. It was confirmed whether or not welding was possible.
- the sound-permeable membrane was disposed so that the support material (nonwoven fabric) of the sound-permeable membrane was in contact with the case.
- Example 1 100 parts by weight of PTFE fine powder (Daikin Kogyo Co., Ltd., F-104) and 20 parts by weight of molding aid n-dodecane (Japan Energy Co., Ltd.) are uniformly mixed, and the resulting mixture is compressed by a cylinder. After that, ram extrusion was performed to obtain a sheet-like mixture. Next, the obtained sheet-like mixture was rolled to a thickness of 0.16 mm through a pair of metal rolls, and the molding aid was dried and removed by heating at 150 ° C. to obtain a PTFE sheet compact.
- PTFE fine powder Daikin Kogyo Co., Ltd., F-104
- molding aid n-dodecane Japan Energy Co., Ltd.
- the obtained sheet compact was stretched in the longitudinal direction (rolling direction) at a stretching temperature of 260 ° C. and a stretching ratio of 10 times to obtain a PTFE porous membrane.
- a black dye manufactured by Orient Chemical Industry Co., Ltd., SP BLACK 91-L, ethanol dilution solution 25% by weight
- 80 parts by weight of ethanol (purity 95%) as a solvent for the dye
- these were heated to 100 ° C. to dry-remove the solvent, and a black PTFE porous membrane was obtained.
- the oil repellent treatment liquid was prepared as follows. 100 g of a compound having a linear fluoroalkyl group represented by the following (formula 1), 0.1 g of azobisisobutyronitrile as a polymerization initiator, and 300 g of a solvent (manufactured by Shin-Etsu Chemical Co., Ltd., FS thinner) are introduced into a nitrogen introduction tube.
- the PTFE porous membrane subjected to the liquid repellent treatment is stretched in the width direction at a stretching temperature of 150 ° C. and a stretching ratio of 10 times, and the whole is further fired at 360 ° C. which is a temperature exceeding the melting point of PTFE (327 ° C.).
- a resin porous membrane (PTFE porous membrane) according to Example 1 was obtained.
- the obtained porous resin membrane had an average pore size of 0.5 ⁇ m, an areal density of 5 g / m 2 , an air permeability of 1.0 sec / 100 mL, and a water pressure resistance of 80 kPa.
- the obtained porous resin membrane and a nonwoven fabric made of ethylene vinyl acetate (EVA) resin (ethylene vinyl acetate elastomer) (fiber diameter 10-15 ⁇ m, surface density 5 g / m 2 ) are laminated by heating press.
- EVA ethylene vinyl acetate
- the lamination process was implemented by pressurizing for 2 seconds on the conditions of heating temperature 200 degreeC and 0.5 Mpa.
- the nonwoven fabric made of EVA resin is obtained by applying EVA resin heated and melted at 200 ° C. onto a PET release film having a thickness of 0.075 mm at a pressure of 5 kg / cm 2. It was.
- the sound-permeable membrane thus obtained exhibited characteristics such as areal density of 10 g / cm 2 , air permeability of 2.0 seconds / 100 mL, water pressure resistance of 110 kPa, and liquid repellency “Yes”.
- Example 2 A sound-permeable membrane according to Example 2 in the same manner as in Example 1 except that a nonwoven fabric made of EVA resin (ethylene vinyl acetate elastomer) having an areal density of 10 g / cm 2 and a fiber diameter of 10 to 15 ⁇ m was used. Got.
- EVA resin ethylene vinyl acetate elastomer
- Example 3 A sound-permeable membrane according to Example 3 in the same manner as in Example 1 except that a nonwoven fabric made of EVA resin (ethylene vinyl acetate elastomer) having an areal density of 15 g / cm 2 and a fiber diameter of 10 to 15 ⁇ m was used. Got.
- EVA resin ethylene vinyl acetate elastomer
- Example 4 Except for using a nonwoven fabric made of polyurethane resin (polyurethane elastomer) with a surface density of 25 g / cm 2 and a fiber diameter of 25 to 30 ⁇ m (KB Selen Co., Espancione FF), the same as in Example 1 Thus, a sound-permeable membrane according to Example 4 was obtained.
- polyurethane resin polyurethane elastomer
- KB Selen Co., Espancione FF KB Selen Co., Espancione FF
- Example 5 The same procedure as in Example 1 was performed except that a non-woven fabric made of polyamide-based elastomer resin (Idemitsu Unitech Co., Ltd., Straflex P PN5065R) having an areal density of 40 g / cm 2 and a fiber diameter of 18 to 25 ⁇ m was used. A sound-permeable membrane according to Example 5 was obtained.
- polyamide-based elastomer resin Idemitsu Unitech Co., Ltd., Straflex P PN5065R
- a sound-permeable membrane according to Example 5 was obtained.
- non-woven fabric manufactured by Hirose Paper Co., Ltd., HOP6
- PP polypropylene
- PE polyethylene
- PET polyethylene terephthalate
- PE polyethylene
- the laminating temperature was a temperature suitable for the material of each nonwoven fabric, and the heating time and the pressurizing pressure were the same as in Example 1.
- thermosetting silicone resin (Toray Dow Corning) diluted with toluene was cast on a silicone release treatment separator (MRS50, manufactured by Mitsubishi Plastics), and a thin film was formed using an applicator. .
- This silicone resin thin film was laminated with a resin porous membrane produced in the same manner as in Example 1, and dried by heating to obtain a laminate of a silicone resin sheet and a resin porous membrane (PTFE porous membrane). In this way, a sound-permeable membrane according to Comparative Example 3 was obtained.
- Table 1 shows the characteristics of the sound-permeable membrane according to each example and each comparative example.
- FIG. 11 is a graph showing the relationship between the sound frequency and insertion loss for Examples 1 to 5
- FIG. 12 is a graph showing the relationship between the sound frequency and insertion loss for Comparative Examples 1 to 3.
- the insertion loss of the 3000 Hz sound of the sound-permeable membranes according to Examples 1 to 5 was all 5 dB or less. Further, the ratio of the loss loss of 3000 Hz sound to the insertion loss of 1000 Hz sound of the sound-permeable membranes according to Examples 1 to 5 was 1.00 to 1.32. In other words, the sound-permeable membranes according to Examples 1 to 5 showed the same level of insertion loss for both the 1000 Hz sound and the 3000 Hz sound. Further, in the sound-permeable membranes according to Examples 1 to 5, the difference between the maximum value and the minimum value of the insertion loss with respect to the sound of 100 Hz to 4000 Hz was 1.92 to 4.11 dB. For this reason, it was suggested that the sound-permeable membranes according to Examples 1 to 5 exhibit acoustic characteristics with little variation in insertion loss with respect to sounds whose frequency range is 100 Hz to 4000 Hz.
- the recovery rate R of the sound-permeable membrane according to Examples 1 to 5 was 91.8% to 98.4%. Therefore, it was suggested that the sound-permeable membranes according to Examples 1 to 5 can be used even when subjected to repeated water pressure because deformation due to water pressure is easily recovered.
- the recovery rate R of the sound-permeable membranes according to Comparative Example 1 and Comparative Example 2 was low, and it was shown that the sound-permeable membranes according to Comparative Example 1 and Comparative Example 2 are difficult to recover deformation due to water pressure.
- the sound-permeable membranes according to Examples 1 to 3 and Example 5 were able to be welded to a polybutyl terephthalate case at 200 ° C. for 3 seconds.
- the sound-permeable membrane according to Example 4 was able to be welded to the case made of polybutyl terephthalate under the condition of 120 ° C. for 3 seconds. It was shown that the sound-permeable membranes according to Examples 1 to 5 can be welded to the case in a state where the nonwoven fabric as a support material is in contact with the case. For this reason, when attaching a sound-permeable film to a case, it is not necessary to use a double-sided tape, an adhesive agent, etc.
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Abstract
Description
音の通過を許容しつつ異物が通過することを阻止する通音膜であって、エラストマーを含む不織布である支持材と、前記支持材に積層されポリテトラフルオロエチレンを主成分とする樹脂多孔質膜とを有する通音膜と、
通音開口を有するケースと、を備え、
前記通音膜は、前記支持材が前記ケースに溶着されていることによって前記通音開口を塞いでいる、通音構造を提供する。
音の通過を許容しつつ異物が通過することを阻止する通音膜であって、
エラストマーを含む不織布である支持材と、
前記支持材に積層されポリテトラフルオロエチレンを主成分とする樹脂多孔質膜とを備え、
前記支持材の表面が撥液剤で被覆されている、通音膜を提供する。
音の通過を許容しつつ異物が通過することを阻止する通音膜であって、
エラストマーを含む不織布である支持材と、
前記支持材に積層されポリテトラフルオロエチレンを主成分とする樹脂多孔質膜とを備え、
貫通孔を有する板材の当該貫通孔を塞ぐように前記通音膜の周縁部を前記板材に接合した状態で前記板材に接合された側から前記通音膜に50kPaの水圧をかけ続けて60分経過した時点での前記周縁部を含む平面からの前記通音膜の最大変位量をH1、その後大気圧状態で静置して360分経過した時点での前記周縁部を含む平面からの前記通音膜の最大変位量をH2としたとき、次式で定義される回復率Rが80%以上である通音膜を提供する。
回復率R=(1-(H2/H1))×100
音の通過を許容しつつ異物が通過することを阻止する通音膜であって、エラストマーを含む不織布である支持材と、前記支持材に積層されポリテトラフルオロエチレンを主成分とする樹脂多孔質膜とを有する通音膜と、
通音開口及び操作開口を有するフレームと、前記操作開口を塞ぐように前記フレームに取り付けられた弾性透明フィルムと、を含むケースとを備え、
前記通音膜は、前記通音開口を塞ぐように前記ケースに取り付けられている防水ケースを提供する。
回復率R=(1-(H2/H1))×100
樹脂多孔質膜又は通音膜の通気度をJIS(日本工業規格) L 1096に規定されている通気性測定法のB法(ガーレー法)に準拠して評価した。
樹脂多孔質膜又は通音膜の耐水圧を、JIS L 1092:2009に記載されている耐水度試験機(高水圧法)を用いて測定した。ただし、この規定に示された試験片の面積では樹脂多孔質膜が著しく変形するので、ステンレスメッシュ(開口径:2mm)を樹脂多孔質膜の加圧面の反対側に設けることによって樹脂多孔質膜の変形をある程度抑制した状態で、樹脂多孔質膜の耐水圧を測定した。
図8Aに示すように、径が2.5mmの貫通孔62が形成された板材60の貫通孔62を塞ぐように通音膜1の周縁部を両面テープ67(日東電工社製、型番No.5620A)によって板材60に接合してJIS L 1092:2009に記載されている耐水度試験機(高水圧法)を用いて、板材60に接合された側から通音膜1に対して水圧WPをかけた。この水圧WPが50kPaに達してから50kPaの水圧WPをかけ続けて60分経過した時点での通音膜1の周縁部を含む平面BFからの通音膜1の変位量を通音膜1の水圧WPを受けている面の反対側に配置したCCDレーザー変位計70(キーエンス社製、LK-G87)を用いて計測した。この変位量の最大値を最大変位量H1とした。なお、通音膜1の周縁部は、ポリエチレンテレフタレート(PET)製のリング状の補強部材66で補強した。
次に、通音膜1に水圧WPをかけるのを停止し、通音膜1を大気圧状態で360分間静置した。図8Bに示すように、この時点での通音膜1の周縁部を含む平面BFからの通音膜1の変位量をCCDレーザー変位計70を用いて計測した。この変位量の最大値を最大変位量H2とした。回復率Rを次式によって算出した。
回復率R=(1-(H2/H1))×100
コピー用紙(普通紙)及び樹脂多孔質膜を、コピー用紙が下になるように積層し、スポイトを用いて樹脂多孔質膜に灯油を一滴垂らした後1分間放置した。その後、樹脂多孔質膜を取り除いてコピー用紙の状態を確認し、コピー用紙が灯油で濡れている場合を撥液性なし、コピー用紙が灯油で濡れていない場合を撥液性ありと評価した。
作製した通音膜の音響特性を以下のように評価した。最初に、図9に示すように、携帯電話の筐体を模したポリスチレン製の模擬筐体20(外形60mm×50mm×28mm)を準備した。この模擬筐体20には、径が2mmであるスピーカー取付穴22及びスピーカーケーブル42の導通孔24が1つずつ設けられており、これ以外に開口は形成しなかった。次に、図9に示すように、径が5mmの通音孔32が形成されたウレタンスポンジ製の充填材30にスピーカー40(スター精密社製、SCG-16A)を取り付け、模擬筐体20の内部に封入した。スピーカーケーブル42を導通孔24から模擬筐体20の外部へ導き出した。その後、導通孔24をパテで塞いだ。
実施例に係る通音膜がケースに溶着可能であるか確認するため、ポリブチレンテレフタレート製のケースにその貫通孔を覆うように実施例に係る通音膜が図4Bに示す溶着装置を用いて溶着可能であるか否か確認した。通音膜の支持材(不織布)がケースに接触するように、通音膜を配置した。
PTFEファインパウダー(ダイキン工業社製、F-104)100重量部と、成形助剤であるn-ドデカン(ジャパンエナジー社製)20重量部とを均一に混合し、得られた混合物をシリンダーによって圧縮した後にラム押出してシート状の混合物とした。次に、得られたシート状の混合物を一対の金属ロールを通して厚さ0.16mmに圧延し、さらに150℃の加熱によって成形助剤を乾燥除去してPTFEのシート成形体を得た。
CH2=CHCOOCH2CH2C6F13 (式1)
面密度が10g/cm2であり、繊維径が10~15μmであるEVA樹脂(エチレン酢酸ビニルエラストマー)製の不織布を用いた以外は、実施例1と同様にして実施例2に係る通音膜を得た。
面密度が15g/cm2であり、繊維径が10~15μmであるEVA樹脂(エチレン酢酸ビニルエラストマー)製の不織布を用いた以外は、実施例1と同様にして実施例3に係る通音膜を得た。
面密度が25g/cm2であり、繊維径が25~30μmであるポリウレタン樹脂(ポリウレタンエラストマー)製の不織布(KBセーレン社製、エスパンシオーネFF)を用いた以外は、実施例1と同様にして実施例4に係る通音膜を得た。
面密度が40g/cm2であり、繊維径が18~25μmであるポリアミド系エラストマー樹脂製の不織布(出光ユニテック社製、ストラフレックスP PN5065R)を用いた以外は、実施例1と同様にして実施例5に係る通音膜を得た。
面密度が6g/cm2であり、繊維径が20~22μmである、ポリプロピレン(PP)とポリエチレン(PE)の芯鞘繊維の不織布(廣瀬製紙社製、HOP6)を用いた以外は、実施例1と同様にして比較例1に係る通音膜を得た。
面密度が30g/cm2であり、繊維径が20~25μmである、ポリエチレンテレフタレート(PET)とポリエチレン(PE)の芯鞘繊維の不織布(ユニチカ社製、エルベスT0303WDO)を用いた以外は、実施例1と同様にして比較例2に係る通音膜を得た。
2液加熱硬化シリコーン樹脂(東レ・ダウコーニング社製)をトルエンで希釈したものを、シリコーン離型処理セパレータ(三菱樹脂社製、MRS50)上に流延し、アプリケータを用いて薄膜を形成した。このシリコーン樹脂の薄膜を実施例1と同様に作製した樹脂多孔質膜と積層し、加熱乾燥させてシリコーン樹脂のシートと樹脂多孔質膜(PTFE多孔質膜)との積層体を得た。このようにして、比較例3に係る通音膜を得た。
Claims (4)
- 音の通過を許容しつつ異物が通過することを阻止する通音膜であって、エラストマーを含む不織布である支持材と、前記支持材に積層されポリテトラフルオロエチレンを主成分とする樹脂多孔質膜とを有する通音膜と、
通音開口を有するケースと、を備え、
前記通音膜は、前記支持材が前記ケースに溶着されていることによって前記通音開口を塞いでいる、通音構造。 - 音の通過を許容しつつ異物が通過することを阻止する通音膜であって、
エラストマーを含む不織布である支持材と、
前記支持材に積層されポリテトラフルオロエチレンを主成分とする樹脂多孔質膜とを備え、
前記支持材の表面が撥液剤で被覆されている、通音膜。 - 音の通過を許容しつつ異物が通過することを阻止する通音膜であって、
エラストマーを含む不織布である支持材と、
前記支持材に積層されポリテトラフルオロエチレンを主成分とする樹脂多孔質膜とを備え、
貫通孔を有する板材の当該貫通孔を塞ぐように前記通音膜の周縁部を前記板材に接合した状態で前記板材に接合された側から前記通音膜に50kPaの水圧をかけ続けて60分経過した時点での前記周縁部を含む平面からの前記通音膜の最大変位量をH1、その後大気圧状態で静置して360分経過した時点での前記周縁部を含む平面からの前記通音膜の最大変位量をH2としたとき、次式で定義される回復率Rが80%以上である通音膜。
回復率R=(1-(H2/H1))×100 - 音の通過を許容しつつ異物が通過することを阻止する通音膜であって、エラストマーを含む不織布である支持材と、前記支持材に積層されポリテトラフルオロエチレンを主成分とする樹脂多孔質膜とを有する通音膜と、
通音開口及び操作開口を有するフレームと、前記操作開口を塞ぐように前記フレームに取り付けられた弾性透明フィルムと、を含むケースとを備え、
前記通音膜は、前記通音開口を塞ぐように前記ケースに取り付けられている防水ケース。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/646,328 US9924250B2 (en) | 2012-11-21 | 2013-10-28 | Sound-transmitting structure, sound-transmitting membrane, and waterproof case |
CN201380060568.6A CN104798380B (zh) | 2012-11-21 | 2013-10-28 | 透声结构、透声膜和防水壳体 |
EP13857064.3A EP2938096B1 (en) | 2012-11-21 | 2013-10-28 | Sound-transmitting structure, sound-transmitting membrane, and water-proof case |
KR1020157012973A KR101989213B1 (ko) | 2012-11-21 | 2013-10-28 | 통음 구조, 통음막 및 방수 케이스 |
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JP2013111285A JP5856102B2 (ja) | 2012-11-21 | 2013-05-27 | 通音構造、通音膜、及び防水ケース |
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EP (1) | EP2938096B1 (ja) |
JP (1) | JP5856102B2 (ja) |
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US9924250B2 (en) | 2018-03-20 |
CN104798380A (zh) | 2015-07-22 |
KR20150088251A (ko) | 2015-07-31 |
US20150304750A1 (en) | 2015-10-22 |
EP2938096B1 (en) | 2019-03-06 |
CN104798380B (zh) | 2018-05-22 |
KR101989213B1 (ko) | 2019-06-13 |
TW201440533A (zh) | 2014-10-16 |
EP2938096A1 (en) | 2015-10-28 |
JP2014123937A (ja) | 2014-07-03 |
JP5856102B2 (ja) | 2016-02-09 |
TWI604734B (zh) | 2017-11-01 |
EP2938096A4 (en) | 2016-11-16 |
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