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

Details Optical glass, preform for precision press-molding, optical... Optical glass, preform for precision press-molding, optical...

2008-01-24

2010-12-21

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S051000, C501S078000, C065S064000

Reexamination Certificate

active

07855158

ABSTRACT:
Provided is an optical glass comprising, denoted as molar percentages:10 to 20 percent SiO2,5 to 40 percent B2O3,SiO2+B2O3=15 to 50 percent,0 to 10 percent Li2O,12 to 36 percent ZnO,where 3×Li2O+ZnO≧18 percent,5 to 30 percent La2O3,0 to 20 percent Gd2O3,0 to 10 percent Y2O3,La2O3+Gd2O3=10 to 30 percent,La2O3/SIGMA(Σ)RE2O3=0.67 to 0.95(where SIGMA(Σ)RE2O3=La2O3+Gd2O3+Y2O3+Yb2O3+Sc2O3+Lu2O3),0.5 to 10 percent ZrO2,1 to 15 percent Ta2O5,1 to 20 percent WO3,Ta2O5/WO3≦2.5 (molar ratio),0 to 8 percent Nb2O5,0 to 8 percent TiO2; andhaving a refractive index nd of not less than 1.87 andan Abbé number nu(v)d of not less than 35 but less then 40.A method for manufacturing a preform for precision press molding by separating a glass melt gob from a glass melt obtained by mixing, heating, and melting glass starting materials, and forming a preform in a glass melt gob cooling step, said mixing, heating, and melting of glass starting materials is conducted so as to obtain the above optical glass.

REFERENCES:
patent: 4854958 (1989-08-01), Marechal et al.
patent: 6413894 (2002-07-01), Sato
patent: 7563736 (2009-07-01), Kobayashi et al.
patent: 2003/0211929 (2003-11-01), Hayashi et al.
patent: 2005/0204776 (2005-09-01), Hayashi
patent: 2006/0234850 (2006-10-01), Hayashi et al.
patent: 2007/0049483 (2007-03-01), Hayashi
patent: 2008/0207429 (2008-08-01), Izuki
patent: 2002-12443 (2001-01-01), None
patent: 2003201142 (2003-07-01), None
patent: 2005-263570 (2005-09-01), None
patent: 2006-16286 (2006-01-01), None
patent: 2006-240889 (2006-09-01), None
patent: 200763071 (2007-03-01), None
patent: 200856554 (2008-03-01), None
patent: WO 2005/042424 (2004-10-01), None
patent: WO 2006/093062 (2006-09-01), None
patent: 2008016164 (2008-02-01), None

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