High-refractive high-transmission optical glass and manufacturing method thereof

Abstract

The present invention relates to an optical glass which does not contain expensive components such as GeO2, Ta2O5 and the like and a Bi2O3 component and has high refraction, high transmission, low dispersion, low relative partial dispersion, and is used for precision molding, and a method of manufacturing the optical glass. The above optical glass is characterized in that the optical glass contains 5 to 20% of SiO2 , 20 to 40% of B2O3 , 10 to 25% of La2O3 , 1 to 12% of Gd2O3 , 0 to 10% of Y2O3 , and 0 to 5% of Yb2O3 in terms of oxide (mol%), wherein sigmaRE2O3=(Gd2O3+La2O3+Y2O3+Yb2O3), 1-15% of Nb2O5, 10-30% of ZnO, 1-8% of ZrO2, 0-10% of Li2O, 0-5% of WO3, 0-8% of TiO2, 0-5% of BaO, 0 to 5% of CaO, 0-5% of Al2O3, and 0-1% of LaF3. The glass has the optical constants of a refractive index(nd) of 1.82 or more, an Abbe number (Vd) of 37 or more but less than 42, and a relative partial dispersion (PgF) of 0.58 or less, the glass transition temperature (Tg) is lower than 610 DEG C, and the upper limit of the intra-glass transmission (lambda tau) is 405 nm or less.

Description

Technical field [0001] The invention relates to an optical glass with high refraction and high transmission, and a method for manufacturing the optical glass. More specifically, the present invention provides an optical glass having a refractive index of 1.82 or more, an Abbe number (vd) of 37 or more but less than 42 optical constants, high transmittance and good stability. The optical glass can be used to prepare precision molded preforms. Background technique [0002] In recent years, with the rapid popularization of single-lens reflex cameras and camcorders, optical systems in single-lens reflex cameras, especially as optical zoom systems for such cameras and camcorders, have also been widely used. As the high refractive index and high transmittance glass used in its optical system, it not only needs to meet the design requirements of high-performance SLR cameras, camcorders and digital cameras, but also the zoom optical systems of SLR cameras and camcorders. And the requir...

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Problems solved by technology

But excess F - The composition will also increase the devitrification temperature, the stability of the glass will be deteriorated, and the preform of the glass will produce excessive streaks

[0006] Furthermore, for this kind of ultra-high refractive index glass, as the refractive index increases, the coloring of the glass will also deepen, and the transmittance will also decrease.

In particular, when using glass that tends to become darker in color, the sensitivity to blue light on the short-wavelength side of the primary color in the optical imaging system of the camera will decrease, which will seriously affect the clarity of the imaging quality, especially the imaging of the zoom optical system of the camera. quality

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