US 12,232,282 B2
Ventilation housing
Daisuke Kitagawa, Osaka (JP); Youzou Yano, Osaka (JP); and Tomoyuki Kasagi, Osaka (JP)
Assigned to NITTO DENKO CORPORATION, Osaka (JP)
Appl. No. 17/283,157
Filed by NITTO DENKO CORPORATION, Ibaraki (JP)
PCT Filed Oct. 11, 2019, PCT No. PCT/JP2019/040316
§ 371(c)(1), (2) Date Apr. 6, 2021,
PCT Pub. No. WO2020/075857, PCT Pub. Date Apr. 16, 2020.
Claims priority of application No. 2018-192352 (JP), filed on Oct. 11, 2018.
Prior Publication US 2021/0345503 A1, Nov. 4, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H05K 5/02 (2006.01)
CPC H05K 5/0213 (2013.01) 5 Claims
OG exemplary drawing
 
1. A ventilation housing comprising:
a housing; and
a ventilation assembly, wherein
the housing comprises a tubular projection extending to project from an outer surface of the housing and internally having a first space communicating an inside and an outside of the housing,
the ventilation assembly comprises:
an internal member being a tubular body having an opening at a first end portion and an opening at a second end portion;
a gas-permeable membrane covering the opening at the first end portion of the internal member; and
an external member being a tubular body having a bottom, the external member being joined to the internal member with the internal member inserted in an interior of the external member from a side of the first end portion,
the ventilation assembly is fixed to the tubular projection with the tubular projection inserted in the opening at the second end portion of the internal member to make an inner peripheral surface of the internal member and an outer peripheral surface of the tubular projection abut each other,
the ventilation assembly has a second space serving as a ventilation path connecting the gas-permeable membrane and an outside of the ventilation assembly in at least one selected from an inside of the external member and an interspace between the internal member and the external member joined together,
a ratio S2min/S1 between an area S1 of a cross-section of the first space taken along a plane perpendicular to a central axis of the tubular projection and a smallest total area S2min determined by comparison of values of different total areas determined at different distances from the gas-permeable membrane is 1.0 or more, the total areas each being determined for a cross-section of the second space taken along a plane perpendicular to a ventilation direction in the ventilation path, the cross-section being located at a certain distance from the gas-permeable membrane, a ratio S2out/S1 between the area S1 of a cross-section of the first space taken along a plane perpendicular to a central axis of the tubular projection and a total area S2out of a plane consisting of a cross-section of the second space taken at a position where the second space is the narrowest when the second space is observed from the second end portion side along a central axis of the ventilation assembly is more than 1.0,
a distance H is a greater height selected from a height H1 of the internal member and a height H2 of the tubular projection,
a sum of the distance H and an insertion depth of the external member is 17 mm or less, and
the ventilation assembly has a moisture permeation rate of at least 55.6 gm−2h−1.