US 12,313,869 B2
Optical filter, optical device, and light-absorbing composition
Yuichiro Kubo, Tokyo (JP); and Katsuhide Shimmo, Kanagawa (JP)
Assigned to NIPPON SHEET GLASS COMPANY, LIMITED, Tokyo (JP)
Appl. No. 18/248,836
Filed by Nippon Sheet Glass Company, Limited, Tokyo (JP)
PCT Filed Sep. 22, 2021, PCT No. PCT/JP2021/034864
§ 371(c)(1), (2) Date Apr. 12, 2023,
PCT Pub. No. WO2022/080105, PCT Pub. Date Apr. 21, 2022.
Claims priority of application No. 2020-172611 (JP), filed on Oct. 13, 2020.
Prior Publication US 2023/0400615 A1, Dec. 14, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 5/22 (2006.01); C08G 77/18 (2006.01); C09D 5/32 (2006.01)
CPC G02B 5/226 (2013.01) [C08G 77/18 (2013.01); C09D 5/32 (2013.01); G02B 5/223 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical filter comprising a light-absorbing layer, the light-absorbing-layer comprising:
a copper complex;
at least one selected from the group consisting of a first alkoxy-containing compound having two alkoxy groups per molecule and a hydrolysate of the first alkoxy-containing compound; and
at least one selected from the group consisting of a second alkoxy-containing compound having three or four alkoxy groups per molecule and a hydrolysate of the second alkoxy-containing compound,
wherein the optical filter is capable of transmitting a light with a first transmission spectrum for an incident light at an incident angle of 0° at 25° C.,
the first transmission spectrum satisfying the following requirements (i), (ii), (iii), and (iv):
(i) a minimum of a transmittance in a wavelength range of 450 nm to 600 nm is 70% or more;
(ii) a maximum of the transmittance in a wavelength range of 300 nm to 370 nm is 5% or less;
(iii) a maximum of the transmittance in a wavelength range of 800 nm to 1000 nm is 5% or less; and (iv) a minimum of the transmittance in a wavelength range of 1500 nm to 1700 nm is 60% or more.