US 12,145,880 B2
Fluorophosphate optical glass, and optical preform, element and instrument
Wei Sun, Sichuan (CN)
Assigned to CDGM GLASS CO., LTD, Sichuan (CN)
Appl. No. 17/279,575
Filed by CDGM GLASS CO., LTD, Sichuan (CN)
PCT Filed Sep. 28, 2018, PCT No. PCT/CN2018/108273
§ 371(c)(1), (2) Date Mar. 24, 2021,
PCT Pub. No. WO2020/062008, PCT Pub. Date Apr. 2, 2020.
Prior Publication US 2021/0395135 A1, Dec. 23, 2021
Int. Cl. C03C 3/247 (2006.01); C03B 11/08 (2006.01)
CPC C03C 3/247 (2013.01) [C03B 11/08 (2013.01); C03B 2215/412 (2013.01)] 21 Claims
 
1. A fluorophosphate optical glass, comprising:
in molar percentage of cations, 2-20% of P5+, 20-40% of Al3+, 0.5-10% of Ba2+, 15-35% of Ca2+, and 1-15% of Mg2+, and an anion contains F− and O2−;
wherein Ba2+/(Ca2++Mg2+) is 0.09-0.125, and
wherein the fluorophosphate optical glass has a thermal expansion coefficient (α20° C.-120° C.) of the optical glass is 160×10−7/K or less, a density (ρ) of 3.55 g/cm3 or less, and a durability in water (Dw) of grade 2 or above.