US 12,253,493 B2
Gas sensor with indirect pass-through ventilation
Daisuke Seo, Ueda (JP); and Yasuhiro Toriyama, Mitaka (JP)
Assigned to Nisshinbo Holdings Inc., Tokyo (JP); Japan Radio Co., Ltd., Tokyo (JP); and Ueda Japan Radio Co., Ltd., Ueda (JP)
Appl. No. 17/312,794
Filed by Nisshinbo Holdings Inc., Tokyo (JP); JAPAN RADIO CO., LTD., Tokyo (JP); and Ueda Japan Radio Co., Ltd., Ueda (JP)
PCT Filed Dec. 24, 2019, PCT No. PCT/JP2019/050506
§ 371(c)(1), (2) Date Jun. 10, 2021,
PCT Pub. No. WO2020/138031, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-242868 (JP), filed on Dec. 26, 2018.
Prior Publication US 2022/0050081 A1, Feb. 17, 2022
Int. Cl. G01N 29/02 (2006.01); G01N 29/22 (2006.01)
CPC G01N 29/02 (2013.01) [G01N 29/222 (2013.01); G01N 2291/0215 (2013.01); G01N 2291/101 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A gas sensor comprising:
a cylindrical body;
an ultrasonic transducer disposed at a first end of the cylindrical body;
an ultrasonic wave reflecting surface disposed at a second end of the cylindrical body, the ultrasonic wave reflecting surface intersecting an axial direction of the cylindrical body; and
a plurality of ventilation holes disposed in a peripheral wall of the cylindrical body, wherein:
the plurality of ventilation holes have corresponding through lines each extending in a direction perpendicular to an axial section of the cylindrical body, the through lines extending directly and in a straight line from the respective ventilation hole to an opposite side of the cylindrical body,
the plurality of ventilation holes have ventilation holes on a first side of the cylindrical body that are not visible when viewed along respective through lines from ventilation holes on an opposite second side of the cylindrical body,
the first side of the cylindrical body is visible when viewed along respective through lines from the ventilation holes on the opposite second side of the cylindrical body,
each of the ventilation holes has a shape extending in the axial direction of the cylindrical body, and
the plurality of ventilation holes includes three or more ventilation holes distributed on the cylindrical body.