Optical glass
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United States of America Patent
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May 15, 2012
Grant Date -
Mar 26, 2009
app pub date -
Nov 19, 2008
filing date -
Jun 10, 2003
priority date (Note) -
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Abstract
An optical glass having a refractive index (nd) within a range from 1.825 to 1.870, an Abbe number (νd) within a range from 22 to less than 27, a transformation temperature (Tg) within a range from 530° C. to 585° C. and an mean coefficient of linear thermal expansion (α) within a range from 80×10−7° C.−1 to 103×10−7° C.−1, comprising SiO2, TiO2, Nb2O5 and Li2O and being substantially free of a Pb compound.
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