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US 2026/0036729 A1Published application
Optical filter
AssigneeAGC Inc.
InventorsTakashi NAGATA, Takahiro SAKAGAMI, Kazuhiko SHIONO
Life of this patent
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Abstract
An optical filter includes: a light-absorbing material X700L having a maximum absorption wavelength in a wavelength region longer than 700 nm; a light-absorbing material Y970S having a maximum absorption wavelength in a wavelength region shorter than 970 nm; and a dielectric multilayer film, in which the optical filter satisfies all of spectral characteristics (i-1) to (i-4).
Claims14
An optical filter comprising:
- a light-absorbing material λ700L having a maximum absorption wavelength in a wavelength region longer than 700 nm;
- a light-absorbing material Y970S having a maximum absorption wavelength in a wavelength region shorter than 970 nm;
- and
- a dielectric multilayer film, wherein
- the optical filter satisfies all of the following spectral characteristics (i-1) to (i-4):
- (i-1) an average transmittance T420-650(0 deg)AVE is 75% or more in a spectral transmittance curve at a wavelength of 420 nm to 650 nm and an incident angle of 0 degrees, and an average transmittance T420-650(35 deg)AVE is 75% or more in a spectral transmittance curve at a wavelength of 420 nm to 650 nm and an incident angle of 35 degrees,
- (i-2) an average transmittance T710-950(0 deg)AVE is 1% or less in a spectral transmittance curve at a wavelength of 710 nm to 950 nm and an incident angle of 0 degrees, and an average transmittance T710-950(35 deg)AVE is 1% or less in a spectral transmittance curve at a wavelength of 710 nm to 950 nm and an incident angle of 35 degrees,
- (i-3) a maximum transmittance T950-1200(0 deg)MAX is 60% or more in a spectral transmittance curve at a wavelength of 950 nm to 1,200 nm and an incident angle of 0 degrees, and a maximum transmittance T950-1200(35 deg)MAX is 50% or more in a spectral transmittance curve at a wavelength of 950 nm to 1,200 nm and an incident angle of 35 degrees, and
- (i-4) |λIRS(0 deg)(50%)−λIRS(35 deg)(50%)|≤15 nm is satisfied, where
- λIRS(0 deg)(50%) is a wavelength at which a transmittance is 50% in a wavelength region shorter than λ950-1200(0 deg)MAX and at an incident angle of 0 degrees,
- λIRS(35 deg)(50%) is a wavelength at which a transmittance is 50% in the wavelength region shorter than λ950-1200(0 deg)MAX and at an incident angle of 35 degrees, and
- λ950-1200(0 deg)MAX is a wavelength at which a maximum transmittance is obtained in the spectral transmittance curve at a wavelength of 950 nm to 1,200 nm and an incident angle of 0 degrees.
9 more elements
Dependencies are inferred from the claim text.