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

2008-04-09

2009-02-17

Group, Karl E (Department: 1793)

Glass manufacturing

Processes

Sequentially forming, reheating, and working

C065S064000, C501S051000, C501S078000, C501S079000

Reexamination Certificate

active

07490485

ABSTRACT:
An optical glass whose refractive index is high and whose coloring is decreased comprising, by weight %, 2 to 45% of B2O3, 0 to 30% of SiO2provided that the content of B2O3>the content of SiO2, 10 to 50% of La2O3, 0 to 30% of TiO2, 0 to 15% of ZnO, 0 to 15% of ZrO2, 0 to 35% of Nb2O5, 0 to 35% of BaO, 0 to 5% of SrO, 0% or more but less than 8% of CaO, 0% or more but less than 13% of MgO, provided that the total content of BaO, SrO, CaO and MgO is 0 to 40%, 0 to 20% of Gd2O3, 0 to 15% of Y2O3, 0 to 18% of Ta2O5, 0% or more but less than 0.5% of WO3, 0% or more but less than 1.5% of a total of Na2O, K2O and Li2O, 0 to 10% of GeO2, 0 to 20% of Bi2O3, 0 to 10% of Yb2O3, 0 to 10% of Al2O3, 0% or more but less than 2% of Sb2O3and 0 to 1% of SnO2.

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Database WPI, Section Ch, Week 197437, Derwent Publications Ltd., XP002277224 & JP 49 021408 A, Feb. 25, 1974 (abstract).

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