Fluorophosphate optical glass
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United States of America Patent
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Nov 28, 2017
Grant Date -
Aug 4, 2016
app pub date -
Apr 21, 2015
filing date -
Apr 22, 2014
priority date (Note) -
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Abstract
An optical glass has refractive index nd greater than 1.59, Abbe number υd greater than 67, low photoelastic coefficient, good chemical stability and excellent grinding property. Fluorophosphate optical glass contains, by cation percentage contents, 30-40% of P5+, 12-20% of Al3+, 30-40% of Ba2+, 1.3-12% of Ca2+, 1-10% of Sr2+, 0-5% of La3+, 0-6% of Gd3+, 0-10% of Y3+, and contains, by anion percentage contents, 25-40% of F+ and 60-75% of O2−. The optical glass is applicable to the manufacturing methods such as high precision molding, secondary hot molding and cold working, in order to produce optical elements like high-performance sphere, aspheric surface, plane lens, prism and raster.
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