Patent ID: 9474172
Filing Date: 2016-10-18
CPC Classification: H05K

Claim Text:
1. A ventilation member comprising: 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 including a structure in which a projection of the second metal body is fitted in a recess of the first metal body, the joint portion fixing the first metal body and the second metal body to each other with the air-permeable membrane held between the first metal body and the second metal body, wherein 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, the flat portion of the first metal body has a first principal surface facing the air-permeable membrane and a second principal surface opposite to the first principal surface, and the first metal body has, on the second principal surface, a membrane protection structure provided in a periphery of the first through-hole to protect the air-permeable membrane located inside the first through-hole, and the flat portion of the second metal body has a first principal surface facing the air-permeable membrane and a second principal surface opposite to the first principal surface, and the second metal body has, on the second principal surface, a membrane protection structure provided in a periphery of the second through-hole to protect the air-permeable membrane located inside the second through-hole, the flat portion of the first metal body and the flat portion of the second metal body have a disk shape, in the first metal body, the membrane protection structure is given by a shape of the periphery of the first through-hole on the second principal surface side of the first metal body, the shape being determined based on outer diameters of the flat portions of the first and second metal bodies and a distance from the second principal surface of the first metal body to the air permeable membrane so as to prevent another ventilation member having the same shape as the ventilation member from contacting the air-permeable membrane of the ventilation member when said another ventilation member comes into contact with the first through-hole of the ventilation member, and in the second metal body, the membrane protection structure is given by a shape of the periphery of the second through-hole on the second principal surface side of the second metal body, the shape being determined based on the outer diameters of the flat portions of the first and second metal bodies and a distance from the second principal surface of the second metal body to the air permeable membrane so as to prevent another ventilation member having the same shape as the ventilation member from contacting the air-permeable membrane of the ventilation member when said another ventilation member comes into contact with the second through-hole of the ventilation member.