US 12,247,915 B2
Optical device
Kengo Sasayama, Tokyo (JP)
Assigned to Asahi Kasei Microdevices Corporation, Tokyo (JP)
Filed by Asahi Kasei Microdevices Corporation, Tokyo (JP)
Filed on Jan. 25, 2024, as Appl. No. 18/422,259.
Application 18/422,259 is a continuation of application No. 17/660,444, filed on Apr. 25, 2022, granted, now 11,921,038.
Application 17/660,444 is a continuation of application No. 16/536,545, filed on Aug. 9, 2019, granted, now 11,346,775, issued on May 31, 2022.
Claims priority of application No. 2018-160781 (JP), filed on Aug. 29, 2018; and application No. 2019-103829 (JP), filed on Jun. 3, 2019.
Prior Publication US 2024/0159662 A1, May 16, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G01N 21/3504 (2014.01); G01N 21/31 (2006.01); G01N 21/61 (2006.01); G01N 21/93 (2006.01); G01N 33/00 (2006.01); G01N 35/00 (2006.01); G02B 5/28 (2006.01)
CPC G01N 21/3504 (2013.01) [G01N 21/314 (2013.01); G01N 21/61 (2013.01); G01N 21/93 (2013.01); G01N 33/0006 (2013.01); G01N 35/00693 (2013.01); G02B 5/281 (2013.01); G02B 5/285 (2013.01); G01N 2021/933 (2013.01); G01N 2035/00702 (2013.01); G01N 2201/0686 (2013.01); G01N 2223/638 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An optical device comprising:
an optical filter having a substrate and a multilayer film having a plurality of layers with different refractive indexes formed on at least one side of the substrate; and
an infrared light emitting and receiving device; wherein
the optical filter includes a wavelength range having an average transmittance of 70% or more with a width of 50 nm or more in a wavelength range of 2400 nm to 6000 nm, and has a maximum transmittance of 5% or more in a wavelength range of 6000 nm or more of a mid-infrared range.