# US 12,120,832 B2 · Air-permeable member with removable protective film for covering ventilation hole > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,832 B2 - Document ID: US12120832B2 - Status: Granted - Kind: B2 - Application number: 17/442,242 - Filed: 2020-03-18 - Published: 2022-05-19 - Granted: 2024-10-15 - Earliest claimed: 2019-03-26 - Assignees: Nitto Denko Corporation - Applicants: Nitto Denko Corporation - Inventors: Hiroki Kigami - Web page: https://patentgrep.com/patent/US12120832B2 ## CPC - H05K 5/0214: {with means preventing penetration of rain water or dust (semi-permeable membranes H05K5/0215, H05K5/0216)} - B01D 63/081: {Manufacturing thereof} - B01D 65/003: {Membrane bonding or sealing} - B01D 69/1071: {Woven, non-woven or net mesh} - B01D 69/1213: {Laminated layers} - B01D 71/36: Polytetrafluoroethylene - B81C 1/00309: {suitable for fluid transfer from the MEMS out of the package or vice versa, e.g. transfer of liquid, gas, sound} - H05K 5/0215: {with semi-permeable membranes attached to casings} - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - B81C: PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS (making microcapsules or microballoons B01J13/02; processes or apparatus specially adapted for the manufacture or treatment of piezoelectric, electrostrictive or magnetostrictive elements per se H10N30/01) ## Abstract A member of the present invention is to be placed to cover a ventilation hole in order to allow passage of gas between an outside and an inside of a housing through the ventilation hole of the housing and prevent dust and/or a liquid from entering the inside from the outside through the ventilation hole. The member of the present invention includes a porous membrane having air permeability in a thickness direction and a provisional protective film joined to the porous membrane to cover the porous membrane from the outside side. The provisional protective film is air-impermeable in a thickness direction or has lower air permeability in the thickness direction than the air permeability of the porous membrane. The provisional protective film and the porous membrane are joined to each other in such a manner that the provisional protective film is removable from the porous membrane. ## Claims ### Claim 1 A member for a ventilation hole, the member to be placed to cover a ventilation hole in order to allow passage of gas between an outside and an inside of a housing through the ventilation hole of the housing and prevent dust and/or a liquid from entering the inside from the outside through the ventilation hole, the member comprising: a porous membrane having air permeability in a thickness direction; and a provisional protective film joined to the porous membrane to cover the porous membrane from the outside side, wherein the provisional protective film is air-impermeable in a thickness direction or has lower air permeability in the thickness direction than the air permeability of the porous membrane, the provisional protective film and the porous membrane are joined to each other in such a manner that the provisional protective film is removable from the porous membrane, wherein the provisional protective film is joined to the porous membrane with an adhesive whose adhesive strength decreases by an external stimulus, and wherein the external stimulus is heat and/or light. ### Claim 2 (depends on 1) The member according to claim 1, wherein the provisional protective film is formed of a material that deforms or deteriorates by the external stimulus or by providing a solvent. ### Claim 3 (depends on 1) The member according to claim 1, wherein the provisional protective film includes a joined portion joined to the porous membrane and a tab portion protruding outward from a peripheral edge of the joined portion. ### Claim 4 (depends on 1) The member according to claim 1, wherein the provisional protective film is air-impermeable in the thickness direction. ### Claim 5 (depends on 1) The member according to claim 1, wherein the porous membrane has an area of 100 mm2 or less. ### Claim 6 (depends on 1) The member according to claim 1, wherein the porous membrane includes a porous polytetrafluoroethylene membrane. ### Claim 7 (depends on 1) The member according to claim 1, further comprising an adhesive layer joined to the porous membrane from the inside side. ### Claim 8 (depends on 7) The member according to claim 7, wherein the adhesive layer is a substrate-less double-faced adhesive tape. ### Claim 9 (depends on 7) The member according to claim 7, wherein the adhesive layer is a double-faced adhesive tape including a substrate formed of a heat-resistant resin including at least one selected from a polyimide, a polyester, a polyetheretherketone, a polyamide-imide, and a fluorine resin. ### Claim 10 (depends on 1) A method for manufacturing an electronic device, the electronic device comprising: a housing including a ventilation hole; and the member for the ventilation hole according to claim 1, the method comprising: transferring the member by a suction-holding device with a suction-holding portion of the suction-holding device in contact with the provisional protective film to a position where the member covers the ventilation hole of the housing; and removing the provisional protective film from the porous membrane after the transferring. ### Claim 11 (depends on 1) A tape for feeding the member for the ventilation hole, the tape comprising: a substrate tape; and a plurality of pieces of the member for the ventilation hole according to claim 1, the pieces being placed on a surface of the substrate tape.