Optical glass
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United States of America Patent
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Jun 13, 2006
Issued Date -
N/A
app pub date -
Jul 10, 2003
filing date -
Jul 18, 2002
priority date (Note) -
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Abstract
An optical glass comprises, in mass percent, 15 35% of P.sub.2O.sub.5, 40 60% of Nb.sub.2O.sub.5, 0.5% to less than 15% of Na.sub.2O and 3% to less than 25% of BaO, has a ratio in mass % of (BaO+Nb.sub.2O.sub.5)/{(TiO.sub.2+WO.sub.3).times.3+Bi.sub.2O.sub.3+Nb.su-b.2O.sub.5}>1.0; is free of Pb and As; and has a refractive index (nd) within a range from 1.78 to 1.90 and an Abbe number (.nu.d) within a range from 18 to 27.
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