Optical glass

Abstract

The invention provides an optical glass for precision pressing. The optical glass comprises 0.1-10wt% of SiO2, 9-20wt% of B2O3, 20-35wt% of La2O3, 1-8wt% of ZrO2, 5-20wt% of ZnO, 1-10wt% of Ta2O5, 5-15wt% of Gd2O3, 0-2wt% of TiO2, 1-10wt% of Y2O3, 1-12wt% of WO3, 0-3wt% of Li2O and 0-1wt% of Sb2O3. The optical glass has a density of below 5.0g / cm<3>, a refractive index of 1.80-1.85, an Abbe number of 40-45, a transition temperature of below 600DE GC, a wavelength lambda80 of below 415nm when the transmittance reaches 80%, and a crystallization ceiling temperature of below 1110DEG C, and is suitable for precision pressing.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass for precision molding with a refractive index (nd) of 1.80-1.85 and an Abbe number (vd) of 40-45, and a preform made of the optical glass and optical components. Background technique [0002] In recent years, with the development of the optoelectronic industry, the requirements for miniaturization, light weight, and high performance have been put forward for optical equipment. In order to reduce the number of lenses that constitute the optical system in optical equipment, more and more aspheric surfaces are used in optical design. lens. Precision molding is now widely used in the manufacture of aspheric lenses. The so-called precision compression molding is to mold a glass preform with a high-precision mold with a predetermined product shape under a certain temperature and pressure, so as to obtain a glass product with a final product shape and an optical function surface. ...

AI Technical Summary

Problems solved by technology

US5288669 discloses an optical glass with a refractive index greater than 1.88 and an Abbe number greater than 29. The defect of this glass is that the viscosity of the glass is small and the glass is easily devitrified

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