Optical glass for precision molding

Details Optical glass for precision molding Optical glass for precision molding

2006-11-28

2006-11-28

Lorengo, J. A. (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S046000, C501S047000, C501S042000

Reexamination Certificate

active

07141525

ABSTRACT:
The present invention provides a high refractive index, high dispersion optical glass for precision molding, being free from harmful materials causing environmental problems, such as lead oxide, etc., and having a low yield temperature (At), i.e. at most 580° C., a refractive index (nd) of at least 1.89 and an Abbe number (νd) of at most 23.0 and further providing a low softening property as well as an improved mass production property with less coloration, which is represented in terms of for making up the glass, by the following chemical composition (wt %):P2O53 to 20%B2O30 to 5%GeO2more than 14 to 37%Sum of P2O5+ B2O3+ GeO224 to 43%Li2O0 to 5%Na2O0 to 8%K2O0 to 10%Sum of Li2O + Na2O + K2O1 to 10%Nb2O50 to 50%Bi2O312 to 67%BaO0 to 5%WO30 to 12%.

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