Optical glass

Abstract

The invention provides optical glass which takes SiO2, B2O3, BaO and La2O3 as main components and contains no lead, thorium, cadmium, arsenic and fluorine. The refractive index (nd) of the optical glass is between 1.68-1.70, and the abbe number (vd) of the optical glass is 48-50. The optical glass has the characteristic of good crystallization property and is suitable for production. Through test according to a GB / T 17129 method, the water resistance (DW) of the optical glass is grade 1, and the acid resistance of the optical glass (DA) is grade 3 or above. The optical glass comprises the following components in percentage by weight: 21-25 percent of SiO2, 8-14 percent of B2O3, 12-18 percent of La2O3, 0.5-3 percent of ZrO2, 34-40 percent of BaO, 2-5 percent of TiO2, 2-5 percent of ZnO, 2-7 percent of CaO, 0-3 percent of Al2O3 and 0-1 percent of Sb2O3, and the total content of the components is above 95 percent, and the total content of glass components is 100 percent.

Description

technical field

[0001] The invention relates to an optical glass, in particular to a silicate lanthanide optical glass with a refractive index (nd) between 1.68-1.70 and an Abbe number (vd) between 48-50. Background technique

[0002] In recent years, optical glass with a refractive index (nd) between 1.68 and 1.70 and an Abbe number (vd) between 48 and 50 has been widely used in optical pickup lenses for CD, DVD and other optical disc systems. It is also widely used in photographic lenses. In order to make the glass have the above properties, the existing invention patents often contain more Nb 2 o 5 , ZnO, Li 2 O and other components, but too much of these components will lead to defects such as low glass viscosity, difficult molding, difficulty in obtaining high-quality streaks, and severe crystallization.

[0003] The glass disclosed in the patent CN101389574A belongs to the same kind of glass as the present invention, but it contains Gd as an essential component and...

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