Abrégé

Disclosed is an optical glass of a high refractive index and a low dispersion containing a Ta2O5 component. The optical glass has a good anti-devitrification property and can realize stable production. The glass has a refractive index (nd) of more than 1.81, an Abbe number (Vd) of above 46 but less than 48; the upper limit of internal transmittance (λƮ80) of the glass is below 350 nm; and the liquidus temperature is below 1150°C.

Classes IPC  ?

• C03C 3/068 - Compositions pour la fabrication du verre contenant de la silice avec moins de 40% en poids de silice contenant du bore contenant des terres rares

Abrégé

Disclosed are a high-refraction and low-dispersion optical glass containing no GeO2 or TeO2 components, and a preparation method therefor. The optical glass comprises, based on the weight percentages of the oxides, at least one of CaO, SrO and BaO, 1-10% of SiO2, 5-18% of B2O3, the total amount of (SiO2+B2O3) being less than 20%, 20-30% of Gd2O3,12-35% of La2O3, 0-8% of Y2O3, the total amount of (Gd2O3+La2O3+Y2O3) being less than 58%, 5-20% of Ta2O5,5-32% of Nb2O5, the total amount of (Ta2O5+Nb2O5) being 17-38%, 0-8% of TiO2, more than 0 but less than 7% of ZrO2, more than 0 but less than 6% of ZnO, 0-5% of WO3, 0-8% of BaO, 0-4% of CaO, 0-4% of SrO, 0-2% of SnO2, 0-2% of Li2O, and 0-1% of Sb2O3. The optical glass has the optical constants of a refractive index (nd) of above 1.94, and an Abbe number (Vd) of above 29 but below 33; the upper limit of the internal transmittance formula (I) λτ70 of the glass is 405 nm or lower; and the liquidus temperature is lower than 1210°C.

Classes IPC  ?

• C03C 3/068 - Compositions pour la fabrication du verre contenant de la silice avec moins de 40% en poids de silice contenant du bore contenant des terres rares

Abrégé

A high-refraction, high dispersion optical glass has high transmittance, low glass density, desirable anti-devitrification, and applicability to repeated pressing in a secondary hot pressing process. The optical glass contains SiO2, B2O3, Gd2O3, Nb2O5, TiO2, BaO, CaO, Ta2O5, ZnO, Li2O, and ZrO2 as essential components, but does not contain Bi2O3. The glass has an index of refraction (nd) of at least 1.88, an Abbe number (Vd) of 23 to 26, a glass density smaller than 4.2g/cm3, and a transition temperature (Tg) lower than 610°C.

Classes IPC  ?

• C03C 3/068 - Compositions pour la fabrication du verre contenant de la silice avec moins de 40% en poids de silice contenant du bore contenant des terres rares

Abrégé

A method for mixing a lanthanide optical glass clinker comprises the following steps: (1) material taking: taking clinkers with different nd values, granularities of the clinkers being all from 1 mm and 10 mm; and (2) mixing: mixing the clinkers in step (1). By using the mixing method, the quality of a lanthanide optical glass can be improved, operations are simple, and the cost is low.

Classes IPC  ?

• C03B 3/00 - Enfournement

Abrégé

A crucible for founding lanthanide optical glass and a method for founding a lanthanide optical glass slag clinker by using the crucible. The crucible comprises a quartz crucible and a fire-resistant material base located at the bottom of the quartz crucible. By using the method for founding a lanthanide optical glass slag clinker, the structure of the crucible, the heating process and founding process are improved.

Classes IPC  ?

• C03B 5/06 - Fusion dans des foursFours, pour autant qu'ils soient spécialement adaptés à la fabrication du verre dans des fours à pots de verrerie
• C03B 5/16 - Caractéristiques particulières du procédé de fusionMoyens auxiliaires spécialement adaptés aux fours de verrerie