US 12,330,985 B2
Near-infrared cut filter glass and optical filter
Takahiro Sakagami, Shizuoka (JP); and Kazuhiko Shiono, Fukushima (JP)
Assigned to AGC INC., Tokyo (JP)
Filed by AGC INC., Tokyo (JP)
Filed on Dec. 22, 2021, as Appl. No. 17/645,553.
Application 17/645,553 is a continuation of application No. PCT/JP2020/024387, filed on Jun. 22, 2020.
Claims priority of application No. 2019-120235 (JP), filed on Jun. 27, 2019; and application No. 2020-017204 (JP), filed on Feb. 4, 2020.
Prior Publication US 2022/0112121 A1, Apr. 14, 2022
Int. Cl. C03C 4/08 (2006.01); C03C 3/17 (2006.01); C03C 17/42 (2006.01); C09D 5/32 (2006.01); C09D 7/41 (2018.01); C09D 179/08 (2006.01); G02B 5/20 (2006.01)
CPC C03C 4/082 (2013.01) [C03C 3/17 (2013.01); C03C 17/42 (2013.01); C09D 5/32 (2013.01); C09D 7/41 (2018.01); C09D 179/08 (2013.01); G02B 5/208 (2013.01); C03C 2217/212 (2013.01); C03C 2217/213 (2013.01); C03C 2218/15 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A near-infrared cut filter glass, comprising:
P2O5, Al2O3, R′O, and Fe2O3 as essential components where R′O is at least one oxide selected from the group consisting of MgO, CaO, SrO, BaO and ZnO,
wherein the near-infrared cut filter glass comprises 5-35% of Fe2O3 by mol % based on oxides and substantially no fluorine and has an average transmittance of 50-92% in a wavelength range of 400-550 nm, a transmittance of 40-92% at a wavelength of 700 nm, an average transmittance of 0.0001-70% in a wavelength range of 850-950 nm, and an average transmittance of 0.0001-60% in a wavelength range of 1200-2500 nm.