OPTICAL GLASS AND OPTICAL ELEMENT

摘要

The present invention is aimed to provide a cost-effective optical glass with refractive index of 1.74-1.80 and Abbe number of 47-51 but containing no Gd2O3 and an optical element made hereof. The optical glass contains the following components according to percentage by weight: more than 2.7% but less than 10% of SiO2, 20-31% of B2O3, 38-49% of La2O3, more than 12% but less than 20% of Y2O3, more than 1% but less than 4% of ZnO, more than 0.5% but less than 3% of Nb2O5, wherein the content of ZnO is more than that of Nb2O5, 0-5% of Ta2O5, 0-5% of RO, wherein the RO is one or more of CaO, SrO and MgO, and content of ZrO2 is more than 6.7% but less than 15%. The present invention is a lanthanum borate glass containing no Gd2O3. A stable glass can be obtained by adjusting the content of La2O3, B2O3 and Y2O3.

主权项

1. An optical glass is characterized in that it comprises the following components according to percentage by weight: more than 2.7% but less than 10% of SiO2, 20-31% of B2O3, 38-49% of La2O3, more than 12% but less than 20% of Y2O3, more than 1% but less than 4% of ZnO, more than 0.5% but less than 3% of Nb2O5, wherein the content of ZnO is more than that of Nb2O5, 0-5% of Ta2O5, 0-5% of RO, wherein the RO is one or more of CaO, SrO and MgO, and content of ZrO2 is more than 6.7% but less than 15%,