US 12,411,079 B2
Gas detection apparatus
Shota Isshiki, Tokyo (JP); Keiichiro Kuwata, Tokyo (JP); and Yuji Ikeda, Kyoto (JP)
Assigned to Asahi Kasei Microdevices Corporation, Tokyo (JP)
Filed by Asahi Kasei Microdevices Corporation, Tokyo (JP)
Filed on Jul. 25, 2023, as Appl. No. 18/358,022.
Claims priority of application No. 2022-119041 (JP), filed on Jul. 26, 2022; and application No. 2023-102731 (JP), filed on Jun. 22, 2023.
Prior Publication US 2024/0035958 A1, Feb. 1, 2024
Int. Cl. G01N 21/25 (2006.01); G01N 21/3504 (2014.01)
CPC G01N 21/255 (2013.01) [G01N 21/3504 (2013.01); G01N 2201/0637 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A gas detection apparatus comprising:
a light emitting portion;
a light receiving portion;
a first mirror that has a reflective surface being a quadric surface and reflects light emitted from the light emitting portion; and
a second mirror that has a reflective surface being a quadric surface and reflects the light reflected by the first mirror to the first mirror, wherein
the quadric surface of the first mirror and the quadric surface of the second mirror have convex portions facing in a same direction,
the first mirror reflects the light reflected by the second mirror to the light receiving portion, and
when one surface of a substrate on which the light emitting portion and the light receiving portion are mounted is used as a reference plane, the first mirror and the second mirror are provided at positions higher than the reference plane and have different heights.