Optical glass, prefabticated member thereof, optical element and optical instrument

Abstract

The invention relates to optical glass, a prefabticated member thereof, an optical element and an optical instrument, and provides the optical glass which is prepared from the following components inpercentage by weight: 0 to 10% of SiO2, 5 to 25% of B2O3, 0 to 15% of ZrO2, 10 to 25% of ZnO, 2 to 30% of TiO2 plus Nb2O5 plus WO3 and 30 to 55% of Ln2O3. The content of the Ln2O3 is total content ofLa2O3, Gd2O3, Y2O3 and Yb2O3, wherein a ratio of B2O3 to Ln20O3 is 0.3 to 0.8, and a ratio of Y2O3 to Gd2O3 is 0.3 to 3. The optical glass has a refractive index (nd) of 1.84 to 1.87 and an abbe number (vd) of 38 to 41, and meanwhile, is excellent in devitrification resistance and crystallization resistance and high in chemical stability.

Description

technical field [0001] The invention belongs to the field of optical glass, and in particular relates to an optical glass and a preform, an optical element and an optical instrument made thereof. Background technique [0002] Optical glass can be used to manufacture lenses, prisms, mirrors, etc. in optical instruments, and components made of optical glass are key components in optical instruments. Optical glass with a refractive index (nd) of 1.84-1.87 and an Abbe number (vd) of 38-41 is widely used in the manufacture of lenses for cameras, telescopes, microscopes and other precision optical instruments due to its good transmission performance and high refractive index. In recent years, it has become a major trend to use aspheric lenses to reduce the number of optical components and thus make optical instruments smaller and lighter, and the market demand is also growing stronger. [0003] However, traditional methods such as hot press forming, grinding and grinding, and mol...

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Problems solved by technology

[0004] Patents CN104803600A, CN104098267A, CN105819682A, etc. respectively provide optical glasses whose refractive index (nd) an...

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