The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 2023
Filed:
Mar. 24, 2022
Asahi Kasei Microdevices Corporation, Tokyo, JP;
Kengo Sasayama, Tokyo, JP;
Asahi Kasei Microdevices Corporation, Tokyo, JP;
Abstract
An optical device comprises an optical filter having a substrate and a multilayer film, and an infrared light emitting and receiving device having a first conductive-type semiconductor layer, an active layer, and a second conductive-type semiconductor layer. The multilayer film has layers with different refractive indexes formed on at least one side of the substrate, in which first and second layers having refractive indexes of 1.2 or more and 2.5 or less, and 3.2 or more and 4.3 or less, respectively, in a wavelength range of 6 μm to 10 μm are alternately stacked. 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 6 μm to 10 μm, and has a maximum transmittance of 10% or more in a wavelength range of 12.5 μm to 20 μm.