Optical glass
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United States of America Patent
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Oct 30, 2012
Grant Date -
Jul 14, 2011
app pub date -
Sep 25, 2009
filing date -
Sep 25, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical glass having a high refractive index (particularly preferably a refractive index of 1.6 or more), low dispersion (an Abbe number of 45 or more), a low deformation point, and improved resistance to devitrification upon molding, and suitable for precision-mold press molding or other molding processes and also suitable for transfer of a fine structure is provided. The optical glass contains 1.0-4.5 wt. % SiO2, 30.5-50.0 wt. % B2O3, 1.1-8.0 wt. % Li2O, 10.1-19.5 wt. % BaO, 15.5-30.0 wt. % ZnO, 3.0-15.0 wt. % Y2O3, and 10.0-19.5 wt. % La2O3.
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