# US 11,029,457 B2 · Optical filter

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- Number: US 11,029,457 B2
- Document ID: US11029457B2
- Status: Granted
- Kind: B2
- Application number: 16/369,653
- Filed: 2019-03-29
- Published: 2019-07-25
- Granted: 2021-06-08
- Earliest claimed: 2014-09-19
- Assignees: AGC Inc.
- Applicants: AGC Inc.
- Inventors: Kazuhiko Shiono; Asana Yoshioka; Shoko Suzuki; Hiroki Hotaka
- Web page: https://patentgrep.com/patent/US11029457B2

## CPC

- G02B 5/208: {for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation}
- C09B 23/105: {two >CH- groups}
- C09B 57/007: {Squaraine dyes}
- C09B 67/0034: {Mixtures of two or more pigments or dyes of the same type}
- C09B 67/0083: {Solutions of dyes}
- C09B 67/0097: {Dye preparations of special physical nature; Tablets, films, extrusion, microcapsules, sheets, pads, bags with dyes}
- G02B 5/0808: {having a single reflecting layer (G02B5/0883, G02B5/0891 take precedence)}
- G02B 5/223: {containing organic substances, e.g. dyes, inks or pigments}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)

## Abstract

To provide an optical filter having shielding effects against near ultraviolet rays and near infrared rays. An optical filter comprising a transparent resin body having a single layer or multilayer structure, and containing a near ultraviolet absorbing dye (U) which is a compound represented by the following formula (U) and which has an absorption maximum at a wavelength of from 370 to 425 nm and has a molar absorptivity at the maximum absorption wavelength of at least 50,000 [L/(mol·cm)], and a near infrared absorbing dye (A) which has an absorption maximum at a wavelength of from 600 to 800 nm: In the formula (U), Y is an oxygen atom, a methylene group or a dimethylene group, R1 is a monovalent hydrocarbon group which may have a substituent, or the like, R2 to R5 are a hydrogen atom, an alkyl group, an alkoxy group or the like, and X is a bivalent group represented by any one of the formulae (X1) to (X5) or the like.

## Claims

### Claim 1

An optical filter comprising a transparent resin body comprising a transparent resin and having a single layer or multilayer structure, wherein the transparent resin body contains a near ultraviolet absorbing dye (U) which has an absorption maximum at a wavelength of from 370 to 425 nm and a near infrared absorbing dye (A) which has an absorption maximum at a wavelength of from 600 to 800 nm, the optical filter has a wavelength λ(U50) at which the transmittance is 50% in a wavelength band of from 400 to 440 nm, and the optical filter satisfies the following requirements (1), (2) and (4) to (8):
(1) there are a wavelength λ(UV15) at which the transmittance is 15% and a wavelength λ(UV70) at which the transmittance is 70% in a wavelength band of from 380 to 450 nm, and λ(UV70)-λ(UV15)30 nm,
(2) there are a wavelength λ(IR15) at which the transmittance is 15% and a wavelength λ(IR70) at which the transmittance is 70% in a wavelength band of from 600 to 720 nm, and λ(IR15)−λ(IR70)60 nm, and
(4) in a spectral transmittance curve at an angle of incidence of 0°, the average transmittance in a wavelength band of from 430 to 620 nm is at least 80%,
(5) in a spectral transmittance curve at an angle of incidence of 0°, the average transmittance in a wavelength band of from 350 to 395 nm is at most 3%,
(6) in a spectral transmittance curve at an angle of incidence of 0°, the average transmittance in a wavelength band of from 710 to 1,100 nm is at most 2%,
(7) in spectral transmittance curves at an angle of incidence of 0° and at an angle of incidence of 30°, the average of absolute values of differences between the transmittance at an angle of incidence of 0° and the transmittance at an angle of incidence of 30° in a wavelength band of from 385 nm to 430 nm is at most 8 [%/nm], and
(8) in spectral transmittance curves at an angle of incidence of 0° and at an angle of incidence of 30°, the average of absolute values of differences between the transmittance at an angle of incidence of 0° and the transmittance at an angle of incidence of 30° in a wavelength band of from 600 nm to 700 nm is at most 8 [%/nm].

### Claim 2 (depends on 1)

The optical filter according to claim 1, wherein the light reflecting layer satisfies the following requirements (9) to (12):
(9) in a spectral transmittance curve at an angle of incidence of 0°, the average transmittance in a wavelength band of from 430 to 620 nm is at least 90%,
(10) in a spectral transmittance curve at an angle of incidence of 0°, the average transmittance in a wavelength band of from 710 to 1,100 nm is at most 10%,
(11) there is a wavelength at which the transmittance is 50% in a wavelength band of from 380 to 430 nm, and
(12) there is a wavelength at which the transmittance is 50% in a wavelength band of from 650 to 750 nm.

### Claim 3 (depends on 1)

The optical filter according to claim 1, wherein the following formula is satisfied, where α(μm) is the average thickness of the transparent resin body, and β is the total mass of the dye (U) and the dye (A) in 100 parts by mass of the transparent resin:
α×β≤20.

### Claim 4 (depends on 1)

The optical filter according to claim 1, wherein the transparent resin is a thermoplastic resin or a curable resin and has a refractive index of at least 1.45.

### Claim 5 (depends on 1)

The optical filter according to claim 1, wherein the transparent resin is at least one member selected from the group consisting of an acrylic resin, an epoxy resin, an enethiol resin, a polycarbonate resin, a polyether resin, a polyarylate resin, a polysulfone resin, a polyether sulfone resin, a polyparaphenylene resin, a polyarylene ether phosphine oxide resin, a polyimide resin, a polyamide imide resin, a polyolefin resin, a cyclic olefin resin and a polyester resin.

### Claim 6 (depends on 1)

The optical filter according to claim 1, wherein the transparent resin has a glass transition temperature Tg of from 200 to 360° C.

### Claim 7 (depends on 1)

The optical filter according to claim 1, wherein the dye (U) is a dye having a molar absorptivity at the maximum absorption wavelength of at least 60,000 [L/(mol·cm)].

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

The optical filter according to claim 1, wherein the dye (A) comprises at least a squarylium dye.

### Claim 10 (depends on 1)

The optical filter according to claim 1, wherein α×β≤16 and α≤5 μm, where wherein α (μm) is the average thickness of the transparent resin body, and β is the total mass of the dye (U) and the dye (A) in 100 parts by mass of the transparent resin.

### Claim 11 (depends on 1)

The optical filter according to claim 1, wherein the transparent resin body is composed of a film or sheet having a single layer or a multilayer structure, or a film having a single layer or a multilayer structure on a transparent substrate.

### Claim 12 (depends on 11)

The optical filter according to claim 11, wherein the transparent substrate is an absorptive glass substrate.

### Claim 13 (depends on 1)

The optical filter according to claim 1, wherein the dye (U) is a compound represented by the following formula (U):
wherein Y is an oxygen atom, or a methylene group or a dimethylene group to which R6 and R7 are bonded,
R1 is a C1-16 monovalent hydrocarbon group which may have a substituent,
R2 to R7 are each independently a hydrogen atom, a halogen atom, or a C1-10 alkyl group or alkoxy group, and
X is a bivalent group represented by a formula selected from the group consisting of the following formulas (X1) to (X5), wherein R8 and R9 are each independently a C1-12 monovalent hydrocarbon group which may have a substituent, and R10 to R19 are each independently a hydrogen atom, or a C1-12 monovalent hydrocarbon group which may have a substituent: