US 12,168,730 B2
Optical filter and imaging device
Sayuri Yamada, Fukushima (JP); Kazuhiko Shiono, Fukushima (JP); and Hiroki Hotaka, Fukushima (JP)
Assigned to AGC Inc., Chiyoda-ku (JP)
Filed by AGC Inc., Chiyoda-ku (JP)
Filed on Jul. 31, 2020, as Appl. No. 16/944,219.
Application 16/944,219 is a continuation of application No. PCT/JP2019/003227, filed on Jan. 30, 2019.
Claims priority of application No. 2018-018608 (JP), filed on Feb. 5, 2018.
Prior Publication US 2020/0363576 A1, Nov. 19, 2020
Int. Cl. C09B 57/00 (2006.01); C09B 23/08 (2006.01); C09B 23/10 (2006.01); G02B 5/20 (2006.01); G02B 5/22 (2006.01); G02B 5/26 (2006.01)
CPC C09B 57/007 (2013.01) [C09B 23/083 (2013.01); C09B 23/10 (2013.01); C09B 23/107 (2013.01); G02B 5/223 (2013.01); G02B 5/208 (2013.01); G02B 5/26 (2013.01)] 20 Claims
 
1. An optical filter, comprising:
a reflection layer comprising a dielectric multilayer film; and
an absorption layer comprising a near-infrared absorbing dye and a transparent resin,
wherein the near-infrared absorbing dye satisfies (i-1) to (i-3) and the transparent resin satisfies the (i-3) in relation to the near-infrared absorbing dye, where in the (i-1), a maximum absorption wavelength λmax(A)DCM is in a wavelength range of 850 to 1,100 nm in an absorbance curve of wavelength 350 to 1,200 nm measured in dichloromethane, in the (1-2), in the absorbance curve of wavelength 350 to 1,200 nm measured in dichloromethane, when an absorbance at the maximum absorption wavelength λmax(A)DCM is denoted by ABSλmax(A)DCM, an absorbance at a wavelength of 400 nm is denoted by ABS400(A) DCM, and an absorbance at a wavelength of 550 nm is denoted by ABS550(A)DCM, Formulae (1) and (2), ABS400(A)DCM/ABSλmax(A)DCM<0.10 (1) and ABS550(A) DCM/ABSλmax(A)DCM<0.04 (2), are satisfied, in the (i-3) in an absorbance curve of the wavelength of 350 to 1,200 nm measured in the transparent resin, a maximum absorption wavelength λmax(A)TR is in a wavelength range of 850 to 1,100 nm, and when an absorbance at the maximum absorption wavelength λmax(A)TR is denoted by ABSλmax(A)TR, an absorbance at the wavelength of 400 nm is denoted by ABS400(A)TR, and an absorbance at the wavelength of 550 nm is denoted by ABS550(A)TR, Formulae (3) and (4), ABS400 (A)TR/ABSλmax(A)TR<0.15 (3) and ABS550(A)TR/ABSλmax(A)TR<0.10 (4), are satisfied, and the near-infrared absorbing dye comprises a squarylium dye of Formula (ASi) or (ASii),

OG Complex Work Unit Chemistry
where R161 is a branched alkyl group having 3 to 20 carbon atoms or a linear alkyl group having 13 to 20 carbon atoms, Y3 is C—R179 or N, R162 to R167 and R171 to R179 are each independently a hydrogen atom, a halogen atom, a sulfo group, a hydroxy group, a cyano group, a nitro group, a carboxyl group, a phosphoric acid group, a —NR112R113 group, a —NHSO2R114 group, a —NHCOR115 group, a —SR116 group, a —SO2R117 group, a —OSO2R118 group, an alkyl group or alkoxy group having 1 to 20 carbon atoms, a halogen-substituted alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 14 carbon atoms, an aryl group having 6 to 14 carbon atoms, or a heterocyclic group having 3 to 14 members, R112 to R118 each independently is a hydrogen atom, an alkyl group or alkoxy group having 1 to 20 carbon atoms, a halogen-substituted alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 14 carbon atoms, an aryl group having 6 to 14 carbon atoms, or a heterocyclic group having 3 to 14 members, and a plurality of R161's to R167's, R171's to R178's, and Y3's included in each formula may be the same as or different from each other.