Patent ID: 11964904
Assignee: AGC INC.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  G | IPC B  C  G

Claim 4:
5. The glass substrate with an antireflection film according to claim 1, wherein the glass has the following composition as represented by mass % based on oxides:

Nb2O5: 5% to 65%,

at least one member selected from the group consisting of TiO2, ZrO2, WO3 and Ln2O3 wherein Ln is at least one member selected from the group consisting of Y, La, Gd, Yb and Lu: 0% to 30%,
SiO2: 15% to 50%,
Li2O+Na2O+K2O: 2% to 20%, and
Li2O/(Li2O+Na2O+K2O): at most 0.45.