WO2016009583A1 - 防水部材及びその防水部材を備えた電子機器 - Google Patents
防水部材及びその防水部材を備えた電子機器 Download PDFInfo
- Publication number
- WO2016009583A1 WO2016009583A1 PCT/JP2015/002589 JP2015002589W WO2016009583A1 WO 2016009583 A1 WO2016009583 A1 WO 2016009583A1 JP 2015002589 W JP2015002589 W JP 2015002589W WO 2016009583 A1 WO2016009583 A1 WO 2016009583A1
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- WIPO (PCT)
- Prior art keywords
- adhesive layer
- porous
- layer
- waterproof member
- sound
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/268—Drying gases or vapours by diffusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/36—Polytetrafluoroethylene
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1656—Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
Definitions
- the present invention relates to a waterproof member and an electronic device including the waterproof member.
- Electronic devices such as mobile phones, notebook computers, electronic notebooks, digital cameras, and game machines generally have a voice function.
- a sound generation unit such as a speaker or a buzzer is disposed, or a sound reception unit such as a microphone is disposed.
- the housing is provided with an opening at a position corresponding to the sound generation unit or the sound receiving unit. Sound is transmitted through the opening.
- a sound-permeable membrane is disposed so as to close the opening of the housing. The sound-permeable membrane blocks the passage of foreign matter while allowing the passage of sound.
- plastic porous membranes such as polytetrafluoroethylene porous membranes and ultrahigh molecular weight polyethylene porous membranes are known (see Patent Document 1).
- Patent Document 2 describes a waterproof sound-permeable member provided with a sound-permeable film and a housing-side adhesive layer.
- the housing side adhesive layer is a layer used for bonding the waterproof sound-permeable member to the housing, and is laminated on the sound-permeable film.
- Patent Document 3 describes a waterproof sound-permeable member provided with a sound-permeable film, a support layer, and a housing-side adhesive layer.
- the peripheral edge portion of the support layer projects outward from the housing-side adhesive layer over the entire circumference.
- the sound-permeable membrane used for the waterproof sound-permeable member of Patent Document 2 and Patent Document 3 has a three-dimensional porous structure. Therefore, the sound-permeable membrane has air permeability not only in the thickness direction but also in the in-plane direction. Water vapor may flow into the housing due to in-plane ventilation. If dew condensation occurs in the precision circuit due to the inflow of water vapor, the electronic equipment may malfunction.
- An object of the present invention is to provide a technique for eliminating or reducing various disadvantages based on the porous material having air permeability in all directions.
- the present invention A first adhesive layer having a frame shape; A second adhesive layer having a frame shape; A porous layer disposed between the first adhesive layer and the second adhesive layer; With When the first adhesive layer, the second adhesive layer, and the porous layer are viewed in plan, the outer shape of the porous layer is positioned inside the outer shape of the first adhesive layer and the outer shape of the second adhesive layer. And Outside the outer shape of the porous layer, the first adhesive layer is directly bonded to the second adhesive layer, Provided is a waterproof member in which a side surface of the porous layer is shielded from the outside by the first adhesive layer and the second adhesive layer.
- the first adhesive layer is directly joined to the second adhesive layer outside the outer shape of the porous layer.
- the side surface of the porous layer is shielded from the outside by the first adhesive layer and the second adhesive layer. According to such a structure, it is possible to eliminate or reduce a disadvantage caused by the material constituting the porous layer having air permeability in all directions.
- FIG. 1 Schematic sectional view of a waterproof member with a release film according to an embodiment of the present invention
- Schematic sectional view of a porous membrane that can be used in the waterproof member shown in FIG. 1 is a schematic partial cross-sectional view of an electronic device in which the waterproof member shown in FIG. 1 is used.
- Explanatory diagram of how to conduct an airtightness test Explanatory drawing of cohesive failure that may occur in the porous layer of a conventional waterproof sound-permeable member
- the waterproof member 10 with a release film of the present embodiment includes a waterproof member 20 and a release film 30 (tab member).
- the release film 30 is attached to the waterproof member 20. After the waterproof member 10 with the release film is attached to a predetermined position, the release film 30 is removed from the waterproof member 20.
- the waterproof member with a release film 10 may be attached to a mount (not shown).
- the waterproof member 20 includes a first adhesive layer 22, a second adhesive layer 24, and a porous layer 26.
- the porous layer 26 is disposed between the first adhesive layer 22 and the second adhesive layer 24.
- one main surface (surface having the widest area) of the porous layer 26 is in contact with the first adhesive layer 22, and the other main surface of the porous layer 26 is in contact with the second adhesive layer 24.
- another layer may be disposed between the first adhesive layer 22 and the porous layer 26.
- Another layer may be disposed between the second adhesive layer 24 and the porous layer 26.
- the waterproof member 20 is a waterproof sound-permeable member having a membrane shape as a whole. Although the use of the waterproof member 20 is not limited to the waterproof sound-permeable member, when the technique disclosed in this specification is applied to the waterproof sound-permeable member, the effects described below can be obtained to the maximum.
- the waterproof member 20 as a sound transmission member is attached to a housing of an electronic device, for example.
- the housing has an opening at a position corresponding to a sound device such as a speaker, a buzzer, or a microphone.
- the waterproof member 20 is attached to the housing so as to close the opening.
- the waterproof member 20 has a disk shape.
- the first adhesive layer 22 and the second adhesive layer 24 each have a frame shape in plan view. Specifically, each of the first adhesive layer 22 and the second adhesive layer 24 has an annular shape in plan view.
- the porous layer 26 has a disk shape with a smaller diameter than the adhesive layers 22 and 24.
- the centers of the first adhesive layer 22, the second adhesive layer 24, and the porous layer 26 coincide.
- the central region of one main surface of the porous layer 26 is not covered with the first adhesive layer 22 and is exposed so as to be exposed to the outside air.
- the central region of the other main surface of the porous layer 26 is not covered with the second adhesive layer 24 and is exposed so as to be exposed to the outside air.
- the shape of the waterproof member 20 is not limited to a circle.
- the shape of the porous layer 26 is also rectangular in plan view.
- the first adhesive layer 22 and the second adhesive layer 24 each have a rectangular frame shape in plan view.
- the external shape of the porous layer 26 is located inside the external shape of the first adhesive layer 22 and the external shape of the second adhesive layer 24. ing.
- the first adhesive layer 22 is directly bonded to the second adhesive layer 24 outside the outer shape of the porous layer 26.
- the side surface of the porous layer 26 is shielded from the outside by the first adhesive layer 22 and the second adhesive layer 24. That is, the outer peripheral portion of the first adhesive layer 22 is in contact with the outer peripheral portion of the second adhesive layer 24 in the radial direction.
- the outer diameter D1 of the first adhesive layer 22 (the outer diameter D1 of the second adhesive layer 24) is larger than the outer diameter D2 of the porous layer 26, and the porous layer 26
- the outer diameter D2 of the first adhesive layer 22 is larger than the inner diameter D3 of the first adhesive layer 22 (the inner diameter D3 of the second adhesive layer 24).
- the direct bonding surface 28 between the first adhesive layer 22 and the second adhesive layer 24 has an annular shape.
- the width ((D1-D2) / 2) of the joining surface 28 is, for example, 0.1 mm or more. Although the upper limit of the width
- the waterproof member 20 of the present embodiment it is possible to prevent water vapor from flowing into the electronic device through the side surface of the porous layer 26. As a result, the possibility that the electronic device malfunctions due to condensation can be reduced. In addition, the airtightness test of the waterproof member 20 can be performed accurately. Further, since the first adhesive layer 22 and the second adhesive layer 24 are directly joined, the porous layer 26 is removed when the release film 30 is removed from the waterproof member 20 or when the waterproof member 20 is peeled from the mount. Can prevent cohesive failure.
- the first adhesive layer 102, the second adhesive layer 103, and the porous layer 104 have the same outer diameter.
- the outer shape of the first adhesive layer 102, the outer shape of the porous layer 104, and the outer shape of the second adhesive layer 103 are the same.
- the release film 101 is not peeled off smoothly from the adhesive layer 102, and instead the porous layer 104 is torn in the thickness direction. There is. Such a phenomenon is called “cohesive failure”. In the case of the waterproof member 100, cohesive failure may occur due to insufficient strength of the material of the porous layer 104 (porous material).
- the first adhesive layer 22 and the second adhesive layer 24 are directly bonded. Therefore, the cohesive failure described with reference to FIG. 6 cannot occur in the porous layer 26 as long as the bonding state between the first adhesive layer 22 and the second adhesive layer 24 is maintained. The bonding state between the first adhesive layer 22 and the second adhesive layer 24 is strong and is not easily broken.
- the entire outer shape of the porous layer 26 is located inside the outer shape of the first adhesive layer 22 and the outer shape of the second adhesive layer 24.
- the side surface of the porous layer 26 is shielded from the outside by the first adhesive layer 22 and the second adhesive layer 24 over the entire circumference (360 °). Therefore, the plurality of effects described above can be obtained over the entire periphery of the waterproof member 20. Conversely, the plurality of effects described above can also be obtained when only a part of the side surface of the porous layer 26 is shielded from the outside by the first adhesive layer 22 and the second adhesive layer 24.
- the first adhesive layer 22 is a layer having adhesiveness on both the upper surface and the lower surface.
- the second adhesive layer 24 is also a layer having adhesiveness on both the upper surface and the lower surface.
- each of the first adhesive layer 22 and the second adhesive layer 24 is a double-sided tape.
- the double-sided tape is recommended as the adhesive layers 22 and 24 because it facilitates handling of the waterproof member 20.
- the double-sided tape is typically composed of a base material and two pressure-sensitive adhesive layers.
- the two pressure-sensitive adhesive layers include a pressure-sensitive adhesive layer provided on one surface of the base material and a pressure-sensitive adhesive layer provided on the other surface of the base material.
- the base material is made of a resin material such as polyethylene terephthalate (PET), polyimide, polyolefin, and polyvinyl chloride.
- Each pressure-sensitive adhesive layer is made of a pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive or a silicone pressure-sensitive adhesive.
- the double-sided tape may be a double-sided tape that does not have a substrate.
- the first adhesive layer 22 and the second adhesive layer 24 may be made of a thermosetting resin sheet instead of the double-sided tape.
- the thermosetting resin sheet is made of a thermosetting resin such as an acrylic resin or an epoxy resin.
- the first adhesive layer 22 and the second adhesive layer 24 are made of the same material and have the same shape and the same dimensions.
- the thickness of the first adhesive layer 22 and the thickness of the second adhesive layer 24 are, for example, in the range of 0.005 to 1.0 mm.
- the material of the first adhesive layer 22 may be different from the material of the second adhesive layer 24.
- the dimension (for example, thickness) of the first adhesive layer 22 may be different from the dimension of the second adhesive layer 24.
- the porous layer 26 is a layer made of a porous material.
- the porous layer 26 has a property of allowing passage of gas such as water vapor and air and preventing passage of foreign matters such as water and dust.
- the porous material include a fluororesin porous body and a polyolefin porous body.
- the fluororesin porous body include a porous body containing polytetrafluoroethylene (PTFE) as a main component.
- PTFE polytetrafluoroethylene
- UHMWPE ultra high molecular weight polyethylene
- These porous materials usually have a three-dimensional porous structure.
- “Ultra high molecular weight polyethylene” means, for example, polyethylene having a weight average molecular weight of 1 million or more.
- the “main component” means a component that is contained most by mass ratio.
- the porous layer 26 may be a resin porous film containing polytetrafluoroethylene as a main component.
- the resin porous membrane has air permeability in both the thickness direction and the in-plane direction. Therefore, when the porous layer 26 is a resin porous film, the technique disclosed in this specification is useful.
- the porosity (porosity) of the porous layer 26 is, for example, 30% or more. When the porosity of the porous layer 26 is in an appropriate range, the air permeability of the waterproof member 20 can be sufficiently secured.
- the upper limit of the porosity of the porous layer 26 is, for example, 98%. Most of the pores in the porous layer 26 may be continuous pores that provide air permeability to the porous layer 26.
- the thickness of the porous layer 26 is, for example, in the range of 0.005 to 0.2 mm.
- the porous layer 26 may be composed of only a resin porous membrane such as a PTFE porous membrane, or may have a breathable support as a reinforcing material. As shown in FIG. 3, the porous layer 26 may be composed of a resin porous membrane 26a and a breathable support 26b. A breathable support 26b is laminated on the resin porous membrane 26a.
- the breathable support 26b is made of a resin material such as polyester, polyethylene, or aramid.
- the structure of the air-permeable support body 26b is, for example, a woven fabric, a nonwoven fabric, a mesh, a net, a sponge, a foam, or a porous body.
- the release film 30 may be made of a resin material such as polyethylene, polypropylene, polyethylene terephthalate, or may be made of paper.
- the release film 30 may be attached to the first adhesive layer 22, may be attached to the second adhesive layer 24, or may be attached to both.
- the surface density of the waterproof member 20 is, for example, in the range of 5 to 100 g / m 2 , and preferably in the range of 10 to 50 g / m 2 from the viewpoints of acoustic characteristics, ease of handling, and strength.
- the surface density of the waterproof member 20 is, for example, in the range of 5 to 100 g / m 2 , and preferably in the range of 10 to 50 g / m 2 from the viewpoints of acoustic characteristics, ease of handling, and strength.
- the original fabric may lose its tension, and wrinkles may occur in the original fabric.
- the manufacturing yield of the waterproof member 20 decreases.
- the surface density of the waterproof member 20 is appropriately adjusted, the occurrence of the above-described problems can be prevented while obtaining excellent acoustic characteristics.
- the work of attaching the waterproof member 20 to the housing is facilitated.
- the porosity of the porous material having a small areal density is high.
- the proportion of the resin portion is small.
- the strength of such porous material is low.
- cohesive failure may occur in the porous layer 104 when the release film 101 is difficult to peel from the waterproof member 100.
- the adhesive force between the release film 30 and the adhesive layer 24 is strong to some extent.
- cohesive failure can be prevented from occurring in the porous layer 26.
- the electronic device 40 of this embodiment includes a housing 42 and an acoustic device 44.
- the acoustic device 44 is disposed inside the housing 42.
- Examples of the sound device 44 include a sound generation unit and a sound reception unit. Speakers, buzzers, etc. can be listed as sounding parts. A microphone etc. are mentioned as a sound-receiving part.
- the housing 42 is provided with an opening 42 h at a position corresponding to the acoustic device 44.
- the waterproof member 20 is attached to the housing 42 so as to close the opening 42h. Specifically, the waterproof member 20 closes the opening 42 h from the inside of the housing 42.
- the first adhesive layer 22 is in contact with the inner surface of the housing 42, and the second adhesive layer 24 is in contact with the acoustic device 44. That is, the waterproof member 20 is sandwiched between the housing 42 and the acoustic device 44. Since the side surface of the porous layer 26 is not exposed to the atmosphere inside the housing 42, when the air inside the housing 42 cannot reach the porous layer 26 through the acoustic device 44, gases such as water vapor and air are It is not possible to flow into the housing 42 from the outside of the housing 42.
- Air permeability The air permeability of the porous membrane was measured in accordance with the air permeability measurement method A (Fragile method) defined in Japanese Industrial Standard (JIS) L 1096.
- the water pressure resistance of the porous membrane was measured by a water resistance tester (high water pressure method) described in JIS L 1092 (2009). However, the porous membrane is significantly deformed in the area of the test piece shown in this rule. Therefore, the water pressure resistance of the porous membrane was measured while a stainless mesh (opening diameter: 2 mm) was arranged on the opposite side of the pressure surface of the porous membrane to suppress deformation of the porous membrane to some extent.
- the apparent density was determined by multiplying the areal density by the thickness. Using the apparent density and the material density, the porosity of the porous membrane was determined from the following formula.
- the density of PET was 1.38 g / cm 3 and the density of PTFE was 2.18 g / cm 3 .
- Example 1 As a porous membrane, a PTFE porous membrane (NTF1026 manufactured by Nitto Denko Corporation) was prepared. The basic properties of this PTFE porous membrane were a porosity of 85%, an areal density of 8.1 g / m 2 , an air permeability of 0.31 cm 3 / cm 2 / sec, a thickness of 0.025 mm, and a water pressure resistance of 250 kPa.
- the porous membrane was punched into a size of ⁇ 5.4 mm.
- a PET film having a thickness of 0.1 mm and a double-sided tape (No. 5603 manufactured by Nitto Denko Corporation, thickness 0.03 mm) were laminated to form an opening of ⁇ 2.5 mm.
- the PET film was used to ensure the rigidity of the waterproof member.
- another double-sided tape (Nitto Denko No. 57120B, thickness 0.20 mm) was formed with an opening of ⁇ 2.5 mm.
- Two double-sided tapes were laminated on the porous film using a laminator so that the porous film was sandwiched between the two double-sided tapes. Thereafter, the whole was punched into a size of ⁇ 5.8 mm.
- a release film (removable tape) was bonded onto the PET film.
- a waterproof member having the structure shown in FIG. 1 was obtained except that a PET film (reference numeral 32 in FIG. 5) was added between the double-sided tape and the release film
- Example 2 A waterproof member was produced in the same manner as in Example 1 except that a laminated product of a PTFE porous membrane and a nonwoven fabric (NTF613AP manufactured by Nitto Denko Corporation) was used as the porous membrane.
- the basic properties of the PTFE porous membrane with nonwoven fabric are: porosity 75% (PTFE porous membrane only), surface density 8.5 g / m 2 , air permeability 0.50 cm 3 / cm 2 / sec, thickness 0.025 mm
- the water pressure resistance was 350 kPa.
- Example 3 A waterproof member was produced in the same manner as in Example 1 except that a polyethylene porous membrane (Sunmap LC manufactured by Nitto Denko Corporation) was used as the porous membrane.
- the basic properties of the polyethylene porous membrane were a porosity of 31%, an areal density of 62.3 g / m 2 , an air permeability of 25 cm 3 / cm 2 / sec, a thickness of 0.100 mm, and a water pressure resistance of 1 kPa.
- Comparative Example 1 A waterproof member of Comparative Example 1 was produced in the same manner as in Example 1 except that the outer diameter of the porous membrane was equal to the outer diameter of the double-sided tape.
- Comparative Example 2 A waterproof member of Comparative Example 2 was produced in the same manner as Example 2 except that the outer diameter of the porous membrane was equal to the outer diameter of the double-sided tape.
- Comparative Example 3 A waterproof member of Comparative Example 3 was produced in the same manner as Example 3 except that the outer diameter of the porous membrane was equal to the outer diameter of the double-sided tape.
- the test apparatus 50 includes a housing 55, an O-ring 53, and a pressurizing instrument 52.
- An opening 55 h with a diameter of 2 mm is formed in the lid portion 55 a of the housing 55.
- a waterproof member was attached to the inner surface of the housing 55 so as to close the opening 55h.
- the housing 55 was sealed with an O-ring 53 and a pressure device 52. Distilled water was poured into a recess formed in the upper surface of the housing 55 so that the waterproof member was in contact with water through the opening 55h.
- the waterproof members of Examples 1 to 3 were airtight, and the waterproof members of Comparative Examples 1 to 3 were not airtight.
- the technology disclosed in this specification can be used for the purpose of imparting waterproofness to electronic devices such as mobile phones, notebook computers, electronic notebooks, digital cameras, and game devices.
- the application target of the technology disclosed in this specification is not limited to an electronic device.
- the technology disclosed in this specification can be used for the purpose of imparting waterproofness to a product having no voice function, for example, a casing of an automobile part such as a sensor, a switch, or an ECU.
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- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
Description
枠の形状を有する第1接着層と、
枠の形状を有する第2接着層と、
前記第1接着層と前記第2接着層との間に配置された多孔質層と、
を備え、
前記第1接着層、前記第2接着層及び前記多孔質層を平面視したとき、前記多孔質層の外形が前記第1接着層の外形及び前記第2接着層の外形の内側に位置しており、
前記多孔質層の前記外形の外側において、前記第1接着層が前記第2接着層に直接接合されており、
前記多孔質層の側面が前記第1接着層及び前記第2接着層によって外部から遮蔽されている、防水部材を提供する。
多孔質膜の通気度は、日本工業規格(JIS) L 1096に規定された通気性測定法のA法(フラジール形法)に準拠して測定した。
多孔質膜の耐水圧は、JIS L 1092(2009)に記載された耐水度試験機(高水圧法)によって測定した。ただし、この規定に示された試験片の面積では多孔質膜が著しく変形する。したがって、ステンレスメッシュ(開口径:2mm)を多孔質膜の加圧面の反対側に配置して多孔質膜の変形をある程度抑制しつつ、多孔質膜の耐水圧を測定した。
多孔質膜をポンチでφ47mmの寸法に打ち抜いた後、打ち抜かれた多孔質膜の質量を測定した。測定された質量を1m2あたりの質量に換算し、面密度を得た。
面密度に厚さを乗じて見かけ密度を求めた。見かけ密度及び材料密度を使用して、以下の式から多孔質膜の気孔率を求めた。PETの密度として1.38g/cm3、PTFEの密度として2.18g/cm3を用いた。
{1-(見かけ密度/材料密度)}×100
多孔質膜として、PTFE多孔質膜(日東電工社製NTF1026)を準備した。このPTFE多孔質膜の基本特性は、気孔率85%、面密度8.1g/m2、通気度0.31cm3/cm2/秒、厚さ0.025mm、耐水圧250kPaであった。
多孔質膜として、PTFE多孔質膜と不織布との積層品(日東電工社製NTF613AP)を使用したことを除き、実施例1と同じ方法で防水部材を作製した。不織布付きのPTFE多孔質膜の基本特性は、気孔率75%(PTFE多孔質膜のみ)、面密度8.5g/m2、通気度0.50cm3/cm2/秒、厚さ0.025mm、耐水圧350kPaであった。
多孔質膜として、ポリエチレン多孔質膜(日東電工社製サンマップLC)を使用したことを除き、実施例1と同じ方法で防水部材を作製した。ポリエチレン多孔質膜の基本特性は、気孔率31%、面密度62.3g/m2、通気度25cm3/cm2/秒、厚さ0.100mm、耐水圧1kPaであった。
多孔質膜の外径が両面テープの外径に等しいことを除き、実施例1と同じ方法で比較例1の防水部材を作製した。
多孔質膜の外径が両面テープの外径に等しいことを除き、実施例2と同じ方法で比較例2の防水部材を作製した。
多孔質膜の外径が両面テープの外径に等しいことを除き、実施例3と同じ方法で比較例3の防水部材を作製した。
図5に示す試験装置50を用いて防水部材の気密性試験を行った。試験装置50は、筐体55、Oリング53及び加圧器具52を備えている。筐体55の蓋部55aにはφ2mmの開口55hが形成されている。開口55hを塞ぐように筐体55の内面に防水部材を貼り付けた。Oリング53及び加圧器具52で筐体55を密閉した。開口55hを通じて防水部材が水に接するように筐体55の上面に形成された凹部に蒸留水を入れた。その後、筐体55の内部の空気に200kPaの圧力を加え、1分後に気泡の有無を確認した。気泡が出る場合は気密性なし、気泡が出ない場合は気密性ありと判断した。結果を表1に示す。
Claims (8)
- 枠の形状を有する第1接着層と、
枠の形状を有する第2接着層と、
前記第1接着層と前記第2接着層との間に配置された多孔質層と、
を備え、
前記第1接着層、前記第2接着層及び前記多孔質層を平面視したとき、前記多孔質層の外形が前記第1接着層の外形及び前記第2接着層の外形の内側に位置しており、
前記多孔質層の前記外形の外側において、前記第1接着層が前記第2接着層に直接接合されており、
前記多孔質層の側面が前記第1接着層及び前記第2接着層によって外部から遮蔽されている、防水部材。 - 前記多孔質層の前記外形の全体が前記第1接着層の前記外形及び前記第2接着層の前記外形の内側に位置している、請求項1に記載の防水部材。
- 前記多孔質層は、ポリテトラフルオロエチレンを主成分として含む樹脂多孔質膜である、又は、前記樹脂多孔質膜と通気性支持体との積層体である、請求項1に記載の防水部材。
- 前記多孔質層の気孔率が30%以上である、請求項1に記載の防水部材。
- 前記防水部材は、全体として、膜の形状を有する防水通音部材である、請求項1に記載の防水部材。
- 前記第1接着層及び前記第2接着層は、それぞれ、両面テープである、請求項1に記載の防水部材。
- 請求項1に記載の防水部材と、
前記防水部材の前記第1接着層又は前記第2接着層に取り付けられた剥離フィルムと、
を備えた、剥離フィルム付き防水部材。 - 筐体と、
前記筐体の内部に配置された発音部又は受音部と、
前記発音部又は前記受音部に対応する位置に形成された前記筐体の開口を塞ぐように前記筐体に取り付けられた請求項5に記載の防水部材と、
を備えた、電子機器。
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| KR1020177000607A KR102296699B1 (ko) | 2014-07-15 | 2015-05-22 | 방수 부재 및 그 방수 부재를 구비한 전자 기기 |
| EP15822077.2A EP3171683B1 (en) | 2014-07-15 | 2015-05-22 | Water-resistant member, and electronic apparatus provided with water-resistant member |
| CN201580038087.4A CN106489307B (zh) | 2014-07-15 | 2015-05-22 | 防水构件和具备该防水构件的电子设备 |
| US15/325,752 US10258934B2 (en) | 2014-07-15 | 2015-05-22 | Waterproof member and electronic device including the waterproof member |
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| US (1) | US10258934B2 (ja) |
| EP (1) | EP3171683B1 (ja) |
| JP (1) | JP6472182B2 (ja) |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20170157573A1 (en) | 2017-06-08 |
| CN106489307A (zh) | 2017-03-08 |
| EP3171683A1 (en) | 2017-05-24 |
| KR20170031692A (ko) | 2017-03-21 |
| CN106489307B (zh) | 2020-07-17 |
| JP2016021502A (ja) | 2016-02-04 |
| EP3171683B1 (en) | 2019-08-21 |
| KR102296699B1 (ko) | 2021-08-31 |
| EP3171683A4 (en) | 2018-02-28 |
| JP6472182B2 (ja) | 2019-02-20 |
| US10258934B2 (en) | 2019-04-16 |
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