Optical filter and imaging device

Patent metadata

Field	Value
Publication number	US-2022011484-A1
Application number	US-202117448562-A
Country	US
Kind code	A1
Filing date	Sep 23, 2021
Priority date	Apr 3, 2019
Publication date	Jan 13, 2022
Grant date	—

Abstract

An optical filter includes: a resin substrate including a resin (P) which has a glass transition temperature of 200° C. or higher and which has specific transmittance properties; an external resin layer; and dielectric multilayer films. In a case where the external resin layer includes the polyimide resin, the optical filter includes an intermediate resin layer including a cycloolefin resin. At least one of the dielectric multilayer films is a near-infrared reflection layer. At least one of the external resin layer and the intermediate resin layer contains a near-infrared absorbing dye (A). The near-infrared absorbing dye (A) has a maximum absorption wavelength within a wavelength range of 800 nm to 1,200 nm. The proportion of a total thickness of members including a resin having a glass transition temperature of 200° C. or higher to a total thickness of the resin-including members is 85% or higher.

First claim

1 . An optical filter, comprising:
a resin substrate comprising a resin (P) which has a glass transition temperature of 200° C. or higher and which, when having a thickness of 100 μm, has an average internal transmittance in a 350-450 nm wavelength range of 95% or higher and a minimum internal transmittance in a 400-450 nm wavelength range of 97% or higher in a spectral transmittance curve over a wavelength range of 350 nm to 1,100 nm; an external resin layer that is disposed on at least one of main surfaces of the resin substrate and that comprises at least one of a polyimide resin and an alicyclic epoxy resin; and dielectric multilayer films disposed as outermost layers on both main surfaces of the resin substrate, wherein: in a case where the external resin layer comprises the polyimide resin, the optical filter comprises an intermediate resin layer comprising a cycloolefin resin, the intermediate resin layer being disposed between the resin substrate and the external resin layer; at least one of the dielectric multilayer films is a near-infrared reflection layer; at least one of the external resin layer and the intermediate resin layer contains a near-infrared absorbing dye (A); the near-infrared absorbing dye (A), when examined in a resin included in the resin layer containing the near-infrared absorbing dye (A), has a maximum absorption wavelength λ max(A)TR within a wavelength range of 800 nm to 1,200 nm in a spectral transmittance curve over a wavelength range of 400 nm to 1,200 nm; and the optical filter has a proportion of a total thickness of members including a resin having a glass transition temperature of 200° C. or higher to a total thickness of the resin-including members of 85% or higher.

2 . The optical filter according to claim 1 , wherein the external resin layer is disposed on each of both main surfaces of the resin substrate.

3 . The optical filter according to claim 1 , wherein the resin (P) comprises at least one resin selected from the group consisting of polyimide resins and polycarbonate resins, and the proportion of the total thickness of members including a resin having a glass transition temperature of 200° C. or higher to the total thickness of the resin-including members is 90% or higher.

4 . The optical filter according to claim 1 , wherein when T AVE435-480(A)TR and T AVE490-560(A)TR are respectively defined as an average internal transmittance for light having wavelengths of 435 nm to 480 nm and an average internal transmittance for light having wavelengths of 490 nm to 560 nm in a spectral transmittance curve over a wavelength range of 400 nm to 1,200 nm obtained by examining the near-infrared absorbing dye (A) in a resin included in the resin layer containing the near-infrared absorbing dye (A) while regulating an internal light transmittance to be 10% at the maximum absorption wavelength λ max(A)TR , and T AVE435-480(A)DCM and T AVE490-560(A)DCM are respectively defined as an average internal transmittance for light having wavelengths of 435 nm to 480 nm and an average internal transmittance for light having wavelengths of 490 nm to 560 nm in a spectral transmittance curve over a wavelength range of 400 nm to 1,200 nm obtained by examining the near-infrared absorbing dye (A) dissolved in dichloromethane while regulating a light transmittance to be 10% at a maximum absorption wavelength λ max(A)DCM , the near-infrared absorbing dye (A) satisfies the following relationships:
|T AVE435-480(A)DCM −T AVE435-480(A)TR | being 5% or less; and
|T AVE490-560(A)DCM −T AVE490-560(A)TR | being 5% or less.

5 . The optical filter according to claim 1 , wherein when T AVE435-480(A)TR , T AVE490-560(A)TR , T 435(A)TR , T 550(A)TR , and T 700(A)TR are respectively defined as an average internal transmittance for light having wavelengths of 435 nm to 480 nm, an average internal transmittance for light having wavelengths of 490 nm to 560 nm, an internal transmittance for light having a wavelength of 435 nm, an internal transmittance for light having a wavelength of 550 nm and an internal transmittance for light having a wavelength of 700 nm in a spectral transmittance curve over a wavelength range of 400 nm to 1,200 nm obtained by examining the near-infrared absorbing dye (A) in a resin included in the resin layer containing the near-infrared absorbing dye (A) while regulating an internal light transmittance to be 10% at the maximum absorption wavelength λ max(A)TR , the near-infrared absorbing dye (A) satisfies the following relationships:
T AVE435-480(A)TR being 88% or higher,
T AVE490-560(A)TR being 88% or higher,
T 435(A)TR being 88.1% or higher,
T 550(A)TR being 79.4% or higher, and
T 700(A)TR being 79.4% or higher.

6 . The optical filter according to claim 1 , wherein the near-infrared absorbing dye (A) comprises at least one dye selected from the group consisting of squarylium dyes and diketopyrrolopyrrole dyes.

7 . The optical filter according to claim 1 , wherein the near-infrared absorbing dye (A) comprises at least one compound selected from the group consisting of compounds represented by the following formula (ASi), compounds represented by the following formula (ASii), compounds represented by the following formula (ASiii), and compounds represented by the following formula (AD):

wherein symbols are as follows:
R 161 moieties are each independently a C 3 -C 20 branched alkyl group or a C 13 -C 20 linear alkyl group;
Y 3 moieties are each independently C—R 179 or N;
R 162 to R 167 moieties and R 171 to R 179 moieties 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 phosphate group, an —NR 112 R 113 group, an —NHSO 2 R 114 group, an —NHCOR 115 group, an —SR 116 group, an —SO 2 R 117 group, an —OSO 2 R 118 group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a C 1 -C 12 halogen-substituted alkyl group, a C 3 -C 14 cycloalkyl group, a C 6 -C 14 aryl group, or a 3- to 14-membered heterocyclic ring group; and
R 112 to R 118 are each independently a hydrogen atom, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a C 1 -C 12 halogen-substituted alkyl group, a C 3 -C 14 cycloalkyl group, a C 6 -C 14 aryl group, or a 3- to 14-membered heterocyclic ring group;

wherein R 11 to R 14 moieties are each independently an alkyl, alkoxy, aryl, or alaryl group which may have a substituent and may contain an unsaturated bond or an oxygen atom between carbon atoms, and R 15 and R 16 moieties are each independently an aryl group, or an alkyl or alkoxy group which may have a substituent and may contain an unsaturated bond, an oxygen atom, an alicyclic ring, or an aromatic ring between carbon atoms, or R 15 and R 16 have combined with each other to form a 5- to 10-membered heterocyclic ring together with a nitrogen atom, in which the heterocyclic ring may have a substituent,

wherein R 201 to R 218 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 phosphate group, an —NR 219 R 220 group, an —NHSO 2 R 221 group, an —NHCOR 222 group, an —SR 223 group, an —SO 2 R 224 group, an —OSO 2 R 225 group, a C 1 -C 20 alkyl group, a C 1 -C 20 alkoxy group, a C 1 -C 12 halogen-substituted alkyl group, a C 3 -C 14 cycloalkyl group, a C 6 -C 14 aryl group, or a 3- to 14-membered hetero

Assignees

• Agc Inc

Inventors

• Shiono Kazuhiko
• Nakayama Motoshi
• Yamada Sayuri
• Shimada Takuro
• Miyazaki Masumi
• Ito Aya
• Yokote Tatsuo

Classifications

• C09B67/0083

  Solutions of dyes · CPC title

• C09B67/0097

  Dye preparations of special physical nature; Tablets, films, extrusion, microcapsules, sheets, pads, bags with dyes · CPC title

• G02B5/208 Primary

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G02B1/11

  Anti-reflection coatings · CPC title

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title