Optical glass, press-molding glass gob and optical element

Details Optical glass, press-molding glass gob and optical element Optical glass, press-molding glass gob and optical element

2006-07-10

2009-11-10

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S049000, C501S051000, C501S077000, C501S078000

Reexamination Certificate

active

07615507

ABSTRACT:
An optical glass having a remarkably high refractive index and excellent stability can be give without being based on PbO, and the optical glass contains, as essential components, at least one oxide selected from La2O3, Gd2O3, Y2O3, Yb2O3, TiO2, Nb2O5or WO3, at least one oxide selected from MgO, CaO, SrO or BaO and B2O3and optionally containing SiO2, wherein on the basis of mass, the total content of B2O3and SiO2is from 1 to 25%, the ratio of (B2O3+SiO2)/(La2O3+Gd2O3+Y2O3+Yb2O3+TiO2+Nb2O5+WO3) is from 0.05 to 0.3 and the ratio of (MgO+CaO+SrO+BaO)/(La2O3+Gd2O3+Y2O3+Yb2O3+TiO2+Nb2O5+WO3) is from 0.1 to 0.4, the optical glass having a refractive index (nd) of 2.000 or more and an Abbe's number (vd) of 27 or less.

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