Highly refractive glass
AssigneeSchott AG
InventorsBianca Schreder, Ute Wölfel, Stefanie Hansen
Life of this patent
Estimating the term…
Abstract
A glass includes the following components in % by weight: 2-10 wt-% SiO2, 2-10 wt-% B2O3, 40-55 wt-% La2O3, 4-11 wt-% Gd2O3, 6-14 wt-% Nb2O5, 8-18.5 wt-% TiO2, and 5-11 wt-% ZrO2. The glass has a refractive index nd of at least 2.02, a sum of the portions of La2O3, Nb2O5, TiO2 and ZrO2 is at least 76.5% by weight, and a weight ratio of a sum of the portions of La2O3, Nb2O5 and ZrO2 to the portion of TiO2 is at least 3.85:1.
Claims20
A glass, comprising the following components in % by weight:
- Proportion
- Component
- (% by weight)
- SiO2
- 2-10
- B2O3
- 2-10
- La2O3
- 40-55
- Gd2O3
- 4-11
- Nb2O5
- 6-14
- TiO2
- 8-18.5
- ZrO2
- 5-11;
- wherein the glass has a refractive index nd of at least 2.02, a sum of the proportions of La2O3, Nb2O5, TiO2 and ZrO2 is at least 76.5% by weight, and a weight ratio of a sum of the proportions of La2O3, Nb2O5 and ZrO2 to the proportion of TiO2 is at least 3.85:1.
A glass having a refractive index nd of at least 2.02 and an internal transmission TI of at least 85%, measured at a wavelength of 460 nm and a sample thickness of 10 mm, wherein the glass comprises the following components in % by weight:
- Proportion
- Component
- (% by weight)
- SiO2 + B2O3
- 6-16
- La2O3
- 40-55
- Gd2O3
- 4-11
- Nb2O5
- 6-14
- TiO2
- 8-18.5
- ZrO2
- 5-11;
- wherein a sum of the proportions of La2O3, Nb2O5, TiO2 and ZrO2 is at least 77% by weight and a weight ratio of a sum of the proportions of La2O3, Nb2O5 and ZrO2 to the proportion of TiO2 is at least 3.85:1, and wherein a weight ratio of the proportion of SiO2 to the proportion of B2O3 is at least 0.65:1.
A glass article, comprising:
- a glass having a refractive index nd of at least 2.02 and being in the form of at least one of:
- a glass for eyeglasses;
- a stack of wafers;
- a wafer;
- a wafer with a maximum diameter of 5.0 cm to 40.0 cm;
- a lens;
- a spherical lens;
- a prism;
- an asphere;
- a light wave guide;
- a fiber;
- or
- a plate;
- wherein the glass has an internal transmission TI of at least 85%, measured at a wavelength of 460 nm and a sample thickness of 10 mm, and wherein the glass comprises the following components in % by weight:
- Proportion
- Component
- (% by weight)
- SiO2
- 2-10
- B2O3
- 2-10
- La2O3
- 40-55
- Gd2O3
- 4-11
- Nb2O5
- 6-14
- TiO2
- 8-18.5
- ZrO2
- 5-11;
- wherein a sum of the proportions of La2O3, Nb2O5, TiO2 and ZrO2 is at least 76.5% by weight, and a weight ratio of a sum of the proportions of La2O3, Nb2O5 and ZrO2 to the proportion of TiO2 is at least 3.85:1.
Dependencies are inferred from the claim text.