Search International and National Patent Collections

1. (WO2017152656) OPTICAL GLASS AND OPTICAL ELEMENT

Pub. No.:    WO/2017/152656    International Application No.:    PCT/CN2016/106786
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Wed Nov 23 00:59:59 CET 2016
IPC: C03C 3/068
Applicants: CDGM GLASS CO., LTD
成都光明光电股份有限公司
Inventors: KUANG, Bo
匡波
Title: OPTICAL GLASS AND OPTICAL ELEMENT
Abstract:
An optical glass having a high refractive index and a low dispersion with a refractive index of 1.76-1.80 and an Abbe number of 47-51. The optical glass comprises the following constituents in percentage by weight: SiO2: 0-3%; B2O3: 25-40%; La2O3: 20-40%; Gd2O3: 12-25%; ZrO2: 6.5-15%; ZnO: greater than 10% but less than or equal to 20%; Ta2O5: 0-5%; Nb2O5: 0-5%; Li2O: 0-10%, a ratio of (Ta2O5 + Nb2O5) to (ZnO + Li2O) being less than 0.45; and Y2O3: 0-10%. The glass transition temperature (Tg) is below 625ºC.