Abstract: A ventilation member includes: a first metal body including a flat portion having a first through-hole formed therein; an air-permeable membrane having a first principal surface and a second principal surface and placed on the flat portion of the first metal body so that the first principal surface covers the first through-hole; a second metal body including a flat portion having formed therein a second through-hole separated from the first through-hole by the air-permeable membrane, the second metal body being placed on a second principal surface side of the air-permeable membrane so that passage of air is permitted between the first through-hole and the second through-hole through the air-permeable membrane; and a joint portion fixing the first metal body and the second metal body to each other. The air-permeable membrane has a portion located outwardly of an outer end of the flat portion of the first metal body and an outer end of the flat portion of the second metal body.

Abstract: A joining member (1) includes an air-permeable membrane (11), a first adhesive layer (21) provided on a side of a first principal surface (11a) of the air-permeable membrane (11), a second adhesive layer (22) provided on a side of a second principal surface (11b) of the air-permeable membrane (11), an opening (21h) formed in the first adhesive layer (21), and a vent groove (1d) formed through the second adhesive layer (22) or between the second adhesive layer (22) and the air-permeable membrane (11). The vent groove (1d) includes a first portion (D1) extending from an outer peripheral edge of the joining member (1) to a region corresponding to the opening (21h) and a second portion (D2) to which the second principal surface (11b) of the air-permeable membrane (11) is exposed in the region corresponding to the opening (21h).

Abstract: A ventilation member 13 includes a gas-permeable sheet 6 and a support body 11 in which a through-hole 11h is formed. One opening of the through-hole 11h is closed by the sheet 6. As a face to which the sheet 6 is to be attached, the support body 11 has a ring-shaped opening end face 12 parallel to the in-plane direction of the sheet 6. In an outer peripheral region 12j of the opening end face 12, the sheet 6 is welded to the support body 11, forming a ring-shaped welded portion 15. The sheet 6 is not welded to the support body 11 in an inner peripheral region 12k of the opening end face 12. The inner peripheral region 12k is surrounded by the welded portion 15.

Abstract: A water-proof sound-transmitting membrane 10 includes a polytetrafluoroethylene porous membrane 1 and has a surface density of 1 to 20 g/m2. The polytetrafluoroethylene porous membrane 1 includes a first porous layer 1a, and a second porous layer 1b stacked on and integrated with the first porous layer 1a by a binding force acting between polytetrafluoroethylene matrices.

Abstract: A water-proof sound-transmitting membrane 10 includes a polytetrafluoroethylene porous membrane 1 and has a surface density of 1 to 20 g/m2. The polytetrafluoroethylene porous membrane 1 includes a first porous layer 1a, and a second porous layer 1b stacked on and integrated with the first porous layer 1a by a binding force acting between polytetrafluoroethylene matrices.

Abstract: The present invention provides a permeable member which can attain both a pullout strength and following property (sealing property) and provides a permeable casing and an electrical component using the permeable member. The present invention includes a permeable film through which a gas passing an opening passes when the permeable film is fixed to the opening of a casing, and a tubular support that supports the permeable film. The support includes a first resin part that contacts the casing with the support fixed to the opening, and a second resin part composed of a material having a higher elastic modulus than that of a material constituting the first resin part, and the first resin part and the second resin part are laminated at least partly in a transverse section of the support.

Abstract: The ventilation member of the present invention includes a waterproof gas permeable membrane (11), and a support body (12) having a through hole (13). One opening of the through hole (13) is closed by the gas permeable membrane (11). The support body (12) includes, at an edge of the opening closed by the gas permeable membrane (11), a first region and a second region facing each other with the opening located therebetween. A first angled protrusion (12a) in which a peak and a trough are arranged alternately along the edge of the opening is provided in the first region, and a second angled protrusion (12b) in which a peak and a trough are arranged alternately along the edge of the opening is provided in the second region.

Abstract: The present invention provides a water-proof sound-transmitting membrane including a polytetrafluoroethylene (PTFE) porous membrane, in which the waterproofness is enhanced further with little lowering of the sound transmittance. The water-proof sound-transmitting membrane includes the PTFE porous membrane. The PTFE porous membrane includes a first porous layer, and a second porous layer stacked on and integrated with the first porous layer by a binding force acting between PTFE matrices. The first porous layer and the second porous layer each are composed of PTFE with a number-average molecular weight of 5.0×107 or more determined by a standard specific gravity method. At least one layer selected from the first porous layer and the second porous layer has an average pore diameter of 1 ?m or less. The water-proof sound-transmitting membrane has a surface density of 1 g/m2 to 10 g/m2.

Abstract: The present invention provides a resin porous membrane with an adhesive layer that exhibits excellent bonding precision and can be bonded to an adherend while maintaining the gas permeability of the porous membrane even when the porous membrane is small, and a method for producing the resin porous membrane with the adhesive layer. The present invention also provides the filter member including the resin porous membrane with the adhesive layer.

Abstract: The present invention provides a resin porous membrane with an adhesive layer that exhibits excellent bonding precision and can be bonded to an adherend while maintaining the gas permeability of the porous membrane even when the porous membrane is small, and a method for producing the resin porous membrane with the adhesive layer. The present invention also provides the filter member including the resin porous membrane with the adhesive layer.

Abstract: A sound-permeable film (11) includes: a porous membrane (13) that contains polytetrafluoroethylene as its main component, allows sound to pass therethrough, and prevents an foreign object such as a water drop from passing therethrough; and a heat-resistant double-sided adhesive sheet (15) that is disposed on a part of at least one of main surfaces of the porous membrane (13).

Abstract: The present invention provides a sound-transmitting membrane for a microphone, to be disposed to a sound-collecting opening of the microphone so as to allow sound to transmit through the membrane while preventing a foreign matter from entering into the microphone through the opening. This membrane for a microphone prevents the entry of a foreign matter, such as fine dust and water vapor, that is difficult for conventional sound-transmitting membranes to block, and ensures the microphone performance. This membrane for a microphone is composed of a nonporous film or a multilayer membrane including a nonporous film, has a surface density of 30 g/m2 or less, and has a sound transmission loss of less than 3 dB in a frequency range of 300 to 4000 Hz.

Abstract: The present invention provides a water-proof sound-transmitting membrane including a polytetrafluoroethylene (PTFE) porous membrane, in which the waterproofness is enhanced further with little lowering of the sound transmittance. The water-proof sound-transmitting membrane includes the PTFE porous membrane. The PTFE porous membrane includes a first porous layer, and a second porous layer stacked on and integrated with the first porous layer by a binding force acting between PTFE matrices. The first porous layer and the second porous layer each are composed of PTFE with a number-average molecular weight of 5.0×107 or more determined by a standard specific gravity method. At least one layer selected from the first porous layer and the second porous layer has an average pore diameter of 1 ?m or less. The water-proof sound-transmitting membrane has a surface density of 1 g/m2 to 10 g/m2.

Abstract: A ventilation member 13 includes a gas-permeable sheet 6 and a support body 11 in which a through-hole 11h is formed. One opening of the through-hole 11h is closed by the sheet 6. As a face to which the sheet 6 is to be attached, the support body 11 has a ring-shaped opening end face 12 parallel to the in-plane direction of the sheet 6. In an outer peripheral region 12j of the opening end face 12, the sheet 6 is welded to the support body 11, forming a ring-shaped welded portion 15. The sheet 6 is not welded to the support body 11 in an inner peripheral region 12k of the opening end face 12. The inner peripheral region 12k is surrounded by the welded portion 15.

Abstract: A water-proof sound-transmitting membrane 10 includes a polytetrafluoroethylene porous membrane 1 and has a surface density of 1 to 20 g/m2. The polytetrafluoroethylene porous membrane 1 includes a first porous layer 1a, and a second porous layer 1b stacked on and integrated with the first porous layer 1a by a binding force acting between polytetrafluoroethylene matrices.

Abstract: The present invention provides a resin porous membrane with an adhesive layer that exhibits excellent bonding precision and can be bonded to an adherend while maintaining the gas permeability of the porous membrane even when the porous membrane is small, and a method for producing the resin porous membrane with the adhesive layer. The present invention also provides the filter member including the resin porous membrane with the adhesive layer.

Abstract: A sound-permeable film (11) includes: a porous membrane (13) that contains polytetrafluoroethylene as its main component, allows sound to pass therethrough, and prevents an foreign object such as a water drop from passing therethrough; and a heat-resistant double-sided adhesive sheet (16) that is disposed on a part of at least one of main surfaces of the porous membrane (13).

Abstract: A ventilation member is provided that can ensure a long time until fogging is produced in the housing 51 and also can shorten the time until the produced fogging disappears when the interior of the housing is fogged. The ventilation member has: a gas permeable membrane (2), fixed to an opening of a housing (51), for allowing gas that passes through the opening to permeate therethrough; a support body (3) for supporting the gas permeable membrane (2); and a one-way valve (4) disposed so as to serve as an obstruction to permeation of the gas in a partial region of the gas permeable membrane (2). A portion of the one-way valve (4) is fixed to the gas permeable membrane (2) and/or the support body (3). At least a portion (B) of an end part of the one-way valve (4) can be deformed in a predetermined one direction by the pressure of the gas that permeates through the gas permeable membrane (2) in the one direction.

Abstract: The present invention provides a permeable member which can attain both a pullout strength and following property (sealing property) and provides a permeable casing and an electrical component using the permeable member. The present invention includes a permeable film through which a gas passing an opening passes when the permeable film is fixed to the opening of a casing, and a tubular support that supports the permeable film. The support includes a first resin part that contacts the casing with the support fixed to the opening, and a second resin part composed of a material having a higher elastic modulus than that of a material constituting the first resin part, and the first resin part and the second resin part are laminated at least partly in a transverse section of the support.