Glass for molded lens
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShigeo Furukawa, Masahiro Hiraka, Shigeki Yamada, Yoshiki Higashiyama
Life of this patent
Estimating the term…
Abstract
A mold lens glass including B2O3, SiO2, La2O3, ZnO, BaO, and CaO, wherein the components in the composition are present in a weight ratio: of B2O3 (25% to 35% by weight), SiO2 (1% to 7% by weight), wherein the total amount of B2O3 and SiO2 is 30% to 40% by weight. La2O3 is present in an amount of 12% to 20% by weight, and the total amount of ZnO, BaO and CaO is 40% to 55% by weight. By using the mold lens glass of the present invention, it is possible to obtain a mold lens glass having a high refractive index, excellent water resistance, and a stable glassy state.
Claims1
A mold lens glass consisting of
- 25% to 35% by weight of B2O3 and
- 1% to 7% by weight of SiO2, the total amount of B2O3 and SiO2 being 30% to 40% by weight;
- and
- 12% to 20% by weight of La2O3, 25% to 35% by weight of ZnO, 5% to 16% by weight of BaO, and 4% to 11% by weight of CaO, the total amount of ZnO, BaO, and CaO being 40% to 55% by weight.
Dependencies are inferred from the claim text.