Optical filter

Patent metadata

Field	Value
Publication number	US-10324240-B2
Application number	US-201715454521-A
Country	US
Kind code	B2
Filing date	Mar 9, 2017
Priority date	Sep 19, 2014
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

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, R 1 is a monovalent hydrocarbon group which may have a substituent, or the like, R 2 to R 5 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.

First claim

What is claimed is:

1. An optical filter comprising a transparent resin body having a single layer or multilayer structure,
wherein the transparent resin comprises 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:

wherein Y is an oxygen atom, a methylene group, or a dimethylene group to which R 6 and R 7 are bonded,
R 1 is a C 1-16 monovalent hydrocarbon group which is optionally substituted,
R 2 to R 7 are each independently a hydrogen atom, a halogen atom, or a C 1-10 alkyl group or alkoxy group, and
X is a bivalent group represented by at least one of the following formulas (X1) to (X5), wherein R 8 and R 9 are each independently a C 1-12 monovalent hydrocarbon group which is optionally substituted, and R 10 to R 19 are each independently a hydrogen atom or a C 1-12 monovalent hydrocarbon group which is optionally substituted:

wherein the optical filter satisfies the following requirements (1) to (3):
(1) λ(UV70)-λ(UV15)<30 nm, wherein λ(UV15) is a wavelength at which the transmittance is 15%, and λ(UV70) is a wavelength at which the transmittance is 70% in a wavelength band of from 380 to 450 nm;
(2) λ(IR15)-λ(IR70)<60 nm, wherein λ(IR15) is a wavelength at which the transmittance is 15%, and λ(IR70) is a wavelength at which the transmittance is 70% in a wavelength band of from 600 to 720 nm; and
(3) a wavelength band, at which the transmittance is at most 1% in a wavelength band of from 650 to 800 nm, is at least 20 nm.

2. The optical filter according to claim 1 , wherein R 1 , R 8 and R 9 are each independently a C 1-6 alkyl group in which at least one hydrogen atom is optionally substituted by a cycloalkyl group or a phenyl group, and R 2 to R 7 and R 10 to R 19 are each independently a hydrogen atom or a C 1-6 alkyl group.

3. The optical filter according to claim 1 , wherein R 1 , R 8 and R 9 are each independently a C 1-6 alkyl group, and R 2 to R 7 and R 10 to R 19 are each independently a hydrogen atom or a C 1-6 alkyl group.

4. The optical filter according to claim 1 , wherein R 2 and R 3 are each independently a C 1-6 alkyl group.

5. The optical filter according to claim 1 , wherein Y is an oxygen atom, and X is (X1) or (X2).

6. 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)].

7. 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.

8. The optical filter according to claim 7 , wherein the dye (A) is a squarylium dye (A1) represented by the following formula (A1):

wherein
Z is a dimethylene group, trimethylene group, oxymethylene group, 2-oxatrimethylene group or C 5-6 1,2-cycloalkylene group, in which at least one hydrogen atom is optionally substituted by at least one group selected from the group consisting of a C 1-12 alkyl group and an alkoxy group,
R 21 is a C 1-12 monovalent hydrocarbon group which is optionally substituted,
R 22 and R 23 are each independently a hydrogen atom, a halogen atom, a C 1-10 alkyl group, or an alkoxy group, and
R 24 is a C 1-25 monovalent hydrocarbon group which is optionally substituted.

9. The optical filter according to claim 8 , wherein R 24 is a C 5-20 alkyl group, a cycloalkyl group, an aralkyl group, or an aryl group, which is optionally substituted.

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

11. 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.

12. The optical filter according to claim 1 , wherein the transparent resin is composed of a polymer having polymerized units containing an aromatic ring or an aliphatic ring.

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

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

15. The optical filter according to claim 14 , wherein the transparent substrate is an absorptive glass substrate.

16. The optical filter according to claim 1 , having a wavelength λ(U50), wherein λ(U50) is a wavelength at which the transmittance is 50% in a wavelength band of from 400 to 440 nm.

17. The optical filter according to claim 1 , which has a light reflecting layer which reflects light and the transparent resin body, and which satisfies the following requirements (4) to (8):
(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.

18. The optical filter according to claim 17 , 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) a wavelength

Assignees

• Agc Inc

Inventors

• Shiono Kazuhiko
• Yoshioka Asana
• Suzuki Shoko
• Hotaka Hiroki

Classifications

• G02B5/0808

  having a single reflecting layer (G02B5/0883, G02B5/0891 take precedence) · 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

• C09B57/007

  Squaraine dyes · CPC title

• G02B5/223

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

• C09B23/105

  two >CH- groups · CPC title