High refractivity and high dispersion optical glass, element and instrument
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United States of America Patent
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Nov 8, 2016
Grant Date -
Jul 23, 2015
app pub date -
Jan 20, 2015
filing date -
Jan 22, 2014
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Abstract
A high refractivity and high dispersion optical glass with light transmissivity and good devitrification resistance. The high refractivity and high dispersion optical glass, including: 1 wt % to 13 wt % of SiO2, 6 wt % to 15 wt % of B2O3, 5 wt % to 22 wt % of TiO2, 35 wt % to 60 wt % of La2O3, 1 wt % to 15 wt % of Gd2O3, 2 wt % to 10 wt % of ZrO2, 1 wt % to 15 wt % of Nb2O5, 0.5 wt % to 8 wt % of ZnO, 0 to 8 wt % of WO3 and 0 to 10 wt % of Y2O3, with Ta2O5 and GeO2 excluded. The optical glass has degree of pigmentation and light transmissivity due to no pigmenting Bi2O3, and has low cost due to no valuable oxides such as Ta2O5 and GeO2. The optical glass has devitrification resistance with a refractive index of 1.95-2.07 and Abbe number of 25-35.
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