US 12,454,619 B2
Optical filter and imaging device
Shoko Suzuki, Tokyo (JP); Kazuhiko Shiono, Fukushima (JP); Sayuri Yamada, Fukushima (JP); and Hiroki Hotaka, Fukushima (JP)
Assigned to AGC Inc., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on Apr. 16, 2024, as Appl. No. 18/636,316.
Application 18/636,316 is a continuation of application No. 16/940,607, filed on Jul. 28, 2020, granted, now 11,993,718.
Application 16/940,607 is a continuation of application No. PCT/JP2019/003238, filed on Jan. 30, 2019.
Claims priority of application No. 2018-018607 (JP), filed on Feb. 5, 2018.
Prior Publication US 2024/0287312 A1, Aug. 29, 2024
Int. Cl. C09B 67/20 (2006.01); C09B 23/16 (2006.01); G02B 5/20 (2006.01); H04N 25/11 (2023.01)
CPC C09B 67/0063 (2013.01) [C09B 23/166 (2013.01); G02B 5/208 (2013.01); H04N 25/11 (2023.01)] 15 Claims
OG exemplary drawing
 
1. An optical filter, comprising: a first absorption layer comprising a near-infrared absorbing dye and a transparent resin; and a reflection layer,
wherein the first absorption layer has a thickness of 0.3 μm to 10 μm, and
wherein the optical filter satisfies the following (ii-2) to (ii-6):
(ii-2) an average transmittance T435-480ave0° of light in a wavelength range of 435 to 480 nm is 70% or more at an incident angle of 0 degrees,
(ii-3) an average transmittance T490-580ave0° of light in a wavelength range of 490 to 580 nm is 84% or more at an incident angle of 0 degrees,
(ii-4) an average transmittance T800-900ave60° of light in a wavelength range of 800 to 900 nm is 0.1% or less at an incident angle of 60 degrees,
(ii-5) a maximum transmittance T800-900max60° of light in a wavelength range of 800 to 900 nm is 2.1% or less at an incident angle of 60 degrees, and
(ii-6) a wavelength λSHT20-0° that is a shorter wavelength of wavelengths showing a transmittance of 20% at an incident angle of 0 degrees is in a wavelength range of 640 to 690 nm, and a difference between a wavelength λSHT20-30° that is a shorter wavelength of wavelengths showing a transmittance of 20% at an incident angle 30 degrees and the wavelength λSHT20-0° is 10 nm or less.