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US 12,247,915 B2Granted
Optical device
AssigneeAsahi Kasei Microdevices Corporation
InventorKengo Sasayama
Life of this patent
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Abstract
An optical device includes 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. 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 the mid-infrared range.
Claims17
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.
2 more elements
Dependencies are inferred from the claim text.