Optical glass, precision press-molding preform, process for...

Glass manufacturing – Processes – Sequentially forming – reheating – and working

Reexamination Certificate

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C065S063000, C501S077000, C501S078000, C501S079000

Reexamination Certificate

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07827823

ABSTRACT:
An optical glass having high refractivity and a low sag temperature and having a low-temperature softening property that enables precision press-molding is provided, and the optical glass contains, by mol %, 5 to 50% of B2O3, 3 to 50% of SiO2, 5 to 40% of TiO2, 1 to 40% of ZnO, 5 to 20% of La2O3, 0 to 10% of Gd2O3, 0 to 15% of Nb2O5, 0 to 10% of ZrO2, 0 to 5% of Ta2O5, 0 to 10% of Bi2O3, 0 to 10% of MgO, 0 to 8% of CaO, 0 to 10% of SrO, 0 to 10% of BaO, provided that the total content of MgO, CaO, SrO and BaO is 15% or less, 0 to 20% of Li2O, and 0 to 5% of Na2O, optionally containing Sb2O3as a refining agent, and having a refractive index (nd) of 1.8 or more and an Abbe's number (νd) of 35 or less.

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1991 Data Book of Glass Composition, p. 106, published by Glass Manufacturers' Association of Japan (GMAJ), with English translation.

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