Optical glass

Details Optical glass Optical glass

2008-09-02

2008-09-02

Lorengo, Jerry (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S903000

Reexamination Certificate

active

10504112

ABSTRACT:
An optical glass comprising in mass %:P2O525%-less than 45%B2O36-20%BaO24%-less than 40%ZnO3-14%MgO0-15%CaO0-15%SrO0-15%Li2O0-5%Na2O0-5%K2O0-5%WO30-5% andAl2O30-5%.The optical glass should preferably contain 0.1-5% WO3, 3.6-15% MgO, 0.1-5% Li2O+Na2O+K2O, 0—less than 0.5% and Sb2O3+As2O3with the mass ratio of ZnO/BaO being 0.12—less than 0.50. The optical glass should preferably have refractive index (nd) within a range from 1.54 to 1.65 and Abbe number (νd) within a range exceeding 57 up to 69 and liquid phase temperature within a range from 870° C. to 930° C. There is provided an optical glass having high resistance to devitrification and medium refractive index and low dispersion characteristics which is free of ingredients such as Ta2O5having a high cost of raw material and therefore can be manufactured at a relatively low cost of raw materials.

REFERENCES:
patent: 3785835 (1974-01-01), Izumitani et al.
patent: 3798041 (1974-03-01), Izumitani et al.
patent: 50-74610 (1975-06-01), None
patent: 52-68217 (1977-06-01), None
patent: 2002211949 (2002-07-01), None
patent: 316661 (1971-12-01), None
Derwent Abstract 2003-032619, abstract of JP 2002-211949 A.
Machine Translation of JP 2002-211949 A.
Derwent Abstract 1972-43341T, abstract of SU 316661 A.
Derwent Abstract 1977-51163Y, abstract of JP 52-068217 A.
Derwent Abstract 1976-79901X, abstract of JP 50-074610 A.

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