Optical glass composition, preform and optical element

Details Optical glass composition, preform and optical element Optical glass composition, preform and optical element

2011-03-01

2011-03-01

Group, Karl E (Department: 1731)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S073000, C501S077000, C501S079000

Reexamination Certificate

active

07897533

ABSTRACT:
An optical glass composition contains, in % by mole, 14.0% or more and 31.0% or less of SiO2, 19.0% or more and 40.0% or less of B2O3, 0% or more and 5.0% or less of Li2O, 0% or more and 12.0% or less of ZnO, 0% or more and 12.0% or less of ZrO2, 15.0% or more and 26.0% or less of La2O3, 22.0% or more and 38.0% or less of La2O3+ZrO2, 2.0% or more and 5.0% or less of Ta2O5and 4.0% or more and 16.0% or less of Gd2O3, and has nd of 1.83 or higher and 1.87 or lower and νd of 43 or higher and 47 or lower, and a preform and an optical element are formed from the optical glass composition.

REFERENCES:
patent: 2003/0211929 (2003-11-01), Hayashi et al.
patent: 2004/0145815 (2004-07-01), Endo
patent: 2004/0235638 (2004-11-01), Uehara et al.
patent: 2005/0209085 (2005-09-01), Endo
patent: 2006/0234850 (2006-10-01), Hayashi et al.
patent: 2003-267748 (2003-09-01), None
patent: 2005015302 (2005-01-01), None
patent: 2005-179142 (2005-07-01), None
patent: 2006-248897 (2006-09-01), None

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