US 12,265,202 B2
Far-infrared ray transmission member and method for manufacturing far-infrared ray transmission member
Yoji Yasui, Tokyo (JP); Kazunobu Maeshige, Tokyo (JP); Takahiro Mashimo, Tokyo (JP); Takuji Oyama, Tokyo (JP); Nobutaka Aomine, Tokyo (JP); and Manaya Kubono, Tokyo (JP)
Assigned to AGC INC., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on Feb. 17, 2023, as Appl. No. 18/111,518.
Application 18/111,518 is a continuation of application No. PCT/JP2021/030619, filed on Aug. 20, 2021.
Claims priority of application No. 2020-143652 (JP), filed on Aug. 27, 2020.
Prior Publication US 2023/0194759 A1, Jun. 22, 2023
Int. Cl. G02B 1/10 (2015.01); B60R 1/00 (2022.01); G02B 13/14 (2006.01)
CPC G02B 1/10 (2013.01) [B60R 1/001 (2013.01); G02B 13/14 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A far-infrared ray transmission member comprising:
a base material configured to transmit far-infrared rays; and
a functional film that is formed on the base material, and comprises a low refractive index layer comprising an oxide as a principal component and having a refractive index equal to or smaller than 1.5 with respect to light at a wavelength of 10 μm,
wherein:
a thickness of the far-infrared ray transmission member is equal to or larger than 1.5 mm;
an optical thickness n1d1 of the low refractive index layer, as a product of a thickness d1 and a refractive index n1 with respect to light at a wavelength of 10 μm, is equal to or larger than 0.1 μm and equal to or smaller than 2.5 μm;
the low refractive index layer comprises MgO as a principal component, and a content of MgO is equal to or larger than 50 mass % and equal to or smaller than 100 mass % with respect to the entire low refractive index layer; and
the far-infrared ray transmission member is mounted on a vehicle.