Optical glass and optical element
AssigneeKonica Minolta Opto, Inc.
InventorYoshihito Taguchi
Life of this patent
Estimating the term…
Abstract
An optical glass includes, based on the total weight of the optical glass: not less than 35 weight percent and less than 45 weight percent of P2O5; not less than 0.5 weight percent and less than 10 weight percent of B2O3; 0 to 16 weight percent of Al2O3; 0 to 2.5 weight percent of SiO2; 0 to 26 weight percent of BaO; 0 to 20 weight percent of SrO; 23 to 49 weight percent of ZnO; more than 6 weight percent and not more than 20 weight percent of CaO; 0 to 16 weight percent of MgO; not less than 0 weight percent and less than 1 weight percent of Li2O; 3 to 19 weight percent of Na2O; and 0 to 20 weight percent of K2O, where the total weight of BaO, SrO, ZnO, CaO, and MgO and the total weight of Li2O, Na2O and K2O are predetermined amounts.
Claims8
An optical glass comprising, based on a total weight of the optical glass:
- not less than 35 weight percent and less than 45 weight percent of P2O5;
- not less than 0.5 weight percent and less than 10 weight percent of B2O3;
- 0 to 16 weight percent of Al2O3;
- 0 to 2.5 weight percent of SiO2;
- 0 to 26 weight percent of BaO;
- 0 to 20 weight percent of SrO;
- 23 to 38 weight percent of ZnO;
- more than 6 weight percent and not more than 20 weight percent of CaO;
- 0 to 16 weight percent of MgO;
- 0 or more weight percent and less than 1 weight percent of Li2O;
- 3 to 19 weight percent of Na2O;
- and
- 0 to 20 weight percent of K2O,
- wherein a total weight of BaO, SrO, ZnO, CaO, and MgO is not more than 55 weight percent based on the total weight of the optical glass,
- a total weight of Li2O, Na2O and K2O is not more than 24 weight percent based on the total weight of the optical glass, and
- a total content of P2O5, B2O3, Al2O3, SiO2, BaO, SrO, ZnO, CaO, MgO, Li2O, Na2O , K2O, TiO2, ZrO2 and Ta2O5 is not less than 99 weight percent based on the total weight of the optical glass.
Dependencies are inferred from the claim text.