Optical filter

Patent metadata

Field	Value
Publication number	US-2023145740-A1
Application number	US-202318155319-A
Country	US
Kind code	A1
Filing date	Jan 17, 2023
Priority date	Jul 27, 2020
Publication date	May 11, 2023
Grant date	—

Abstract

The present invention relates to an optical filter including: a substrate; and a dielectric multilayer film laid on or above at least one major surface of the substrate, as an outermost layer, in which: the substrate includes a resin film containing a dye (U) having a maximum absorption wavelength in a range of 360 to 395 nm in dichloromethane, a dye (A) having a maximum absorption wavelength in a range of 600 to 800 nm in dichloromethane, and a resin; and the optical filter satisfies spectral characteristics (i-1) to (i-5).

First claim

1 . An optical filter comprising:
a substrate; and a dielectric multilayer film laid on or above at least one major surface of the substrate, as an outermost layer, wherein: the substrate comprises a resin film containing a dye (U) having a maximum absorption wavelength in a range of 360 to 395 nm in dichloromethane, a dye (A) having a maximum absorption wavelength in a range of 600 to 800 nm in dichloromethane, and a resin; and the optical filter satisfies all of the following spectral characteristics (i-1) to (i-5): (i-1) an average transmittance T 440-480 of a spectral transmittance curve in a wavelength range of 440 to 480 nm is 86% or more; (i-2) an absolute value of a difference between UV10 (0deg) and UV10 (50deg) is 3 nm or less, an absolute value of a difference between UV20 (0deg) and UV20 (50deg) is 4 nm or less, and an absolute value of a difference between UV50 (0deg) and UV50 (50deg) is 3 nm or less, where UV10 (0deg) , UV20 (0deg) , and UV50 (0deg) represent wavelengths at which transmittances are 10%, 20%, and 50%, respectively, at an incident angle of 0° in a wavelength range of 350 to 450 nm, and UV10 (50deg) , UV20 (50deg) , and UV50 (50deg) represent wavelengths at which transmittances are 10%, 20%, and 50%, respectively, at an incident angle of 50° in a wavelength range of 350 to 450 nm; (i-3) an average transmittance T 400-440 of a spectral transmittance curve in a wavelength range of 400 to 440 nm is 40% or more; (i-4) an average transmittance T 370-400(0deg) of a spectral transmittance curve at an incident angle of 0° in a wavelength range of 370 to 400 nm is 1% or less; and (i-5) an average transmittance T 370-400(50deg) of a spectral transmittance curve at an incident angle of 50° in a wavelength range of 370 to 400 nm is 0.5% or less.

2 . The optical filter according to claim 1 , wherein the optical filter further satisfies the following spectral characteristic (i-6):
(i-6) an absolute value of a difference between UV10 (0deg) and UV70 (0deg) is 16 nm or less, where UV10 (0deg) and UV70 (0deg) represent wavelengths at which transmittances are 10% and 70%, respectively, at an incident angle of 0° in a wavelength range of 350 to 450 nm.

3 . The optical filter according to claim 1 , wherein the dye (U), in a spectral transmittance curve of a coated film formed by coating an alkali glass plate with a solution obtained by dissolving the dye (U) in the resin, satisfies all of the following spectral characteristics (ii-1) to (ii-6):
(ii-1) an average transmittance T 400-440 in a wavelength range of 400 to 440 nm is 40% or more; (ii-2) an average transmittance T 370-400 in a wavelength range of 370 to 400 nm is 5% or less; (ii-3) a transmittance T 400 at a wavelength of 400 nm is 7% or less; (ii-4) a transmittance T 390 at a wavelength of 390 nm is 5% or less; (ii-5) a transmittance T 380 at a wavelength of 380 nm is 5% or less; and (ii-6) a transmittance T 370 at a wavelength of 370 nm is 5% or less.

4 . The optical filter according to claim 1 , wherein the dye (U) further satisfies the following spectral characteristic (iii-1):
(iii-1) an absolute value of a difference between UV10 and UV70 is 25 nm or less, where UV10 and UV70 represent wavelengths at which transmittances are 10% and 70%, respectively, in a wavelength range of 350 to 450 nm in a spectral transmittance curve that is measured by dissolving the dye (U) in dichloromethane so that a transmittance at a maximum absorption wavelength becomes 10%.

5 . The optical filter according to claim 1 , wherein the resin film has a thickness of 10 μm or less, and a product of a total content of the dye (U) and the dye (A) in the resin film and the thickness of the resin film is 100 (mass %·μm) or less.

6 . The optical filter according to claim 1 , wherein:
the dye (U) is a dye (U1) having a maximum absorption wavelength in a range of 370 to 385 nm in dichloromethane; the resin film further comprises a dye (U2) having a maximum absorption wavelength in a range of 385 to 405 nm in dichloromethane; and an absolute value of a difference between maximum absorption wavelengths of the dye (U1) and the dye (U2) in the resin is 10 nm or more and 15 nm or less.

7 . The optical filter according to claim 1 , wherein the optical filter further satisfies all of the following spectral characteristics (i-4-1) to (i-6-1):
(i-4-1) the average transmittance T 370-400(0deg) is 0.5% or less; (i-5-1) the average transmittance T 370-400(50deg) is 0.1% or less; and (i-6-1) an absolute value of a difference between UV10 (0deg) and UV10 (70deg) is 14 nm or less, where UV10 (0deg) and UV70 (0deg) represent wavelengths at which transmittances are 10% and 70%, respectively, at an incident angle of 0° in a wavelength range of 350 to 450 nm.

8 . The optical filter according to claim 1 , wherein the dye (U) comprises a merocyanine dye.

9 . The optical filter according to claim 8 , wherein the merocyanine dye is a compound represented by the following Formula (M):

where symbols in Formula (M) have the following meanings:
R 1 represents a monovalent hydrocarbon group having a carbon number of 1 to 12 that may include a substituent;
R 2 to R 5 represent, independently of each other, a hydrogen atom, a halogen atom, an alkyl group having a carbon number of 1 to 10, or an alkoxy group having a carbon number of 1 to 10;
Y represents an oxygen atom or a methylene group that is replaced by R 6 and R 7 ;
R 6 and R 7 represent, independently of each other, a hydrogen atom, a halogen atom, an alkyl group having a carbon number of 1 to 10, or an alkoxy group having a carbon number of 1 to 10; and
X represents one of divalent groups represented by the following Formulae (X1) to (X5), where R 8 and R 9 represent, independently of each other, a monovalent hydrocarbon group having a carbon number of 1 to 12 that may include a substituent, and R 10 to R 19 represent, independently of each other, a hydrogen atom or a monovalent hydrocarbon group having a carbon number of 1 to 12 that may include a substituent:

10 . The optical filter according to claim 1 , wherein the dye (A) comprises at least one dye selected from a squarylium dye, a phthalocyanine dye, and a cyanine dye.

11 . The optical filter according to claim 1 , wherein the dye (A) comprises a squarylium dye that is made of a compound represented by the following Formula (I):

where symbols in Formula (I) have the following meanings:
R 24 and R 26 represent, independently of each other, a hydrogen atom, a halogen atom, an hydroxyl group, an alkyl group having a carbon number of 1 to 6, an alkoxy group having a carbon number of 1 to 6, an acyloxy group having a carbon number of 1 to 10, —NR 27 R 28 (R 27 and R 28 represent, independently of each other, a hydrogen atom, an alkyl group having a carbon number of 1 to 20, —C(═O)—R 29 (R 29 represents a hydrogen atom, an alkyl group having a carbon number 1 to 20 that may include a substituent, an aryl group having a carbon number of 6 to 11 that may include a substituent, or an alaryl group having a carbon number of 7 to 18 that may include a substituent and may have an oxygen atom between carbon atoms), —NHR 30 or SO 2 —R 30 (each R 30 represents a hydrocarbon group having a carbon number of 1 to 25 whose one or more hydrogen

Assignees

• Agc Inc

Inventors

• Shiono Kazuhiko
• Shimada Takuro
• ORITA Yuichiro

Classifications

• G02B5/283 Primary

  designed for the ultraviolet · CPC title

• C08K5/3475

  condensed with carbocyclic rings · CPC title

• C08K2201/014

  Additives containing two or more different additives of the same subgroup in C08K · CPC title

• C08K5/3415

  Five-membered rings · CPC title

• C09B67/0033

  Blends of pigments; Mixtured crystals; Solid solutions · CPC title