Patent ID: 11858846
Assignee: CHINA BUILDING MATERIALS ACADEMY CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC C  G  Y | IPC C  G

Claim 0:
1. A composition of glass with high refractive index for fiber optic imaging elements with medium-expansion, comprising the following components in percentage by weight:
SiO2 5-9%
Al2O3 0-1%
B2O3 23-28%
CaO 0-3%
BaO 6-12%
La2O3 30-34%
Nb2O5 4-8%
Ta2O5 0-1%
Y2O3 0-1%
ZnO 4-9%
TiO2 4-8%
ZrO2 4-6%
SnO2 0-1%, wherein the glass with high refractive index has a refractive index of 1.80-1.82, a coefficient of mean linear thermal expansion of (68±5)×10−7/° C. in the range of 30-300° C., a strain point temperature of more than 600° C., and a devitrification temperature of more than 820° C.