Optical glass for precision molding

Details Optical glass for precision molding Optical glass for precision molding

2007-12-25

2007-12-25

Lorengo, J. A. (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S046000, C501S047000, C501S048000, C501S901000

Reexamination Certificate

active

10980280

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, a refractive index (nd) of at least 1.83 and an Abbe number (νd) of at most 26.0 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 %):P2O515 to 29%B2O3 0 to 2%GeO2 0 to 14%Sum of P2O5+ B2O3+ GeO220 to 35%Li2O 0 to 5%Na2O 3 to 14%K2O 0 to 9%Sum of Li2O + Na2O + K2O 5 to 15%Nb2O5 2 to less than 22%Bi2O334 to 60%WO3 0 to 5%BaO 0 to 5%In2O3  0 to 7%.

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Derwent Abstract 2007-165950, english Abstract of JP 2007-015904 A.

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