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US08748328B2 Optical glass, preform for precision press molding, optical element and method of manufacturing thereof 有权
光学玻璃，精密加压成型用预成型体，光学元件及其制造方法

Optical glass, preform for precision press molding, optical element and method of manufacturing thereof
Abstract:
An optical glass having a refractive index nd of 1.70 or greater and an Abbé number of 50 or greater. Given as mole percentages, it comprises: B2O3 (20 to 80 percent), SiO2 (0 to 30 percent), Li2O (1 to 25 percent), ZnO (0 to 20 percent), La2O3 (4 to 30 percent), Gd2O3 (1 to 25 percent), Y2O3 (0 to 20 percent), ZrO2 (0 to 5 percent), MgO (0 to 25 percent), CaO (0 to 15 percent), and SrO (0 to 10 percent), with the combined quantity of the above components being 97 percent or greater. The molar ratio of {ZnO/(La2O3+Gd2O3+Y2O3)} is 0.8 or less and the molar ratio of {(CaO+SrO+BaO)/(La2O3+Gd2O3+Y2O3)} is 0.8 or less. Ta2O5 may be incorporated as an optional component, with the molar ratio {(ZrO2+Ta2O5)/(La2O3+Gd2O3+Y2O3)} being 0.4 or less.
Abstract(Chinese):

折射率nd为1.70以上，Abbé数为50以上的光学玻璃。 以百分比计，B2O3（20-80％），SiO2（0-30％），Li2O（1％至25％），ZnO（0-20％），La2O3（4-30％），Gd2O3 1〜25％），Y2O3（0〜20％），ZrO2（0〜5％），MgO（0〜25％），CaO（0〜15％）和SrO（0〜10％ 上述成分的量为97％以上。 {ZnO /（La 2 O 3 + Gd 2 O 3 + Y 2 O 3）}的摩尔比为0.8以下，{（CaO + SrO + BaO）/（La2O3 + Gd2O3 + Y2O3）}的摩尔比为0.8以下。 Ta2O5可以以（（ZrO 2 + Ta 2 O 5）/（La 2 O 3 + Gd 2 O 3 + Y 2 O 3）}的摩尔比为0.4以下的任意成分结合。

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