Optical glass and use thereof
AssigneeHoya Corporation
InventorYasuhiro Fujiwara
Life of this patent
Estimating the term…
Abstract
An aspect of the present invention relates to optical glass, which is oxide glass including cation components in the form of 10 to 40 cation % of P5+, equal to or more than 50 cation % of a combined quantity of Ti4+, Nb5+, W6+, Bi3+, and Te4+, with a cation ratio of a combined content of Ti4+ and Nb5+ to a combined content of W6+ and Bi3+ being equal to or less than 1.3, a combined quantity of B3+, Li+, Na+, K+, Rb+, Cs+, Mg2+, Ca2+, Sr2+, Ba2+, and Zn2+ which amounts to equal to or less than ⅓ of a combined content of Ti4+, Nb5+, W6+, Bi3+, and Te4+, and more than 0% of Li+, Na+, K+, Rb+, and Cs+ combined, and which has a refractive index of equal to or higher than 2.02.
Claims20
Optical glass, which is oxide glass comprising cation components in the form of:
- 10 to 40 cation % of P5+;
- equal to or more than 50 cation % of a combined quantity of Ti4+, Nb5+, W6+, Bi3+, and Te4+, with a cation ratio of a combined content of Ti4+ and Nb5+ to a combined content of W6+ and Be3+, (Ti4++Nb5+)/(W6++Bi3+), being equal to or less than 1.3;
- a combined quantity of B3+, Li+, Na+, K+, Rb+, Cs+, Mg2+, Ca2+, Sr2+, Ba2+, and Zn2+ which amounts to equal to or less than ⅓ of a combined content of Ti4+, Nb5+, W6+, Bei3+, and Te4+;
- and
- more than 0% of Li+, Na+, K+, Rb+, and Cs+ combined;
- and
- which has a refractive index of equal to or higher than 2.02.
Optical glass, which has a refractive index nd of equal to or higher than 2.02 and a temperature at which viscosity becomes 1.0 dPa·s of equal to or lower than 1,100° C.
Dependencies are inferred from the claim text.