OPTICAL GLASS AND PROJECTION ALIGNER USING THE SAME

The optical glass of the present invention comprises a composition in terms of weight ratio within the range of 0 to 14.8 wt% of SiO2, 30 to 60 wt% of B2O3, 0 to 17.5 wt% of Al2O3, 0 to 0.4 wt% of Li2O, 0 to 3 wt% of Na2O, 0 to 3 wt% of K2O, 0 to 5 wt% of MgO, 0 to 30 wt% of CaO, 0 to 30 wt% of SrO,...

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Hauptverfasser: KIDO, KAZUHIRO, SUGISAKI, MASAHIKO, MATSUMARU, SHIZUO
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creator KIDO, KAZUHIRO
SUGISAKI, MASAHIKO
MATSUMARU, SHIZUO
description The optical glass of the present invention comprises a composition in terms of weight ratio within the range of 0 to 14.8 wt% of SiO2, 30 to 60 wt% of B2O3, 0 to 17.5 wt% of Al2O3, 0 to 0.4 wt% of Li2O, 0 to 3 wt% of Na2O, 0 to 3 wt% of K2O, 0 to 5 wt% of MgO, 0 to 30 wt% of CaO, 0 to 30 wt% of SrO, 0 to 35 wt% of BaO, where RO (MgO + CaO + SrO + BaO) is 8 to 35 wt%, 0 to 20 wt% of ZnO, 0 to 6.5 wt% of La2O3, 0 to 15 wt% of Gd2O3, 0 to 15 wt% of Y2O3, 0 to 10 wt% of Ta2O3, 0 to 9.5 wt% of ZrO2, 0 to 1 wt% of As2O3, and 0 to 0.5 wt% of Sb2O3; and has a refractive index (nd) of 1.52 to 1.65, an Abbe number ( nu d) of 55 to 61, and an 80% transmission wavelength (at a thickness of 10 mm including no reflection loss) of 330 nm or shorter.
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subjects BASIC ELECTRIC ELEMENTS
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS
CHEMISTRY
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
GLASS
JOINING GLASS TO GLASS OR OTHER MATERIALS
METALLURGY
MINERAL OR SLAG WOOL
SEMICONDUCTOR DEVICES
SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS
SURFACE TREATMENT OF GLASS
title OPTICAL GLASS AND PROJECTION ALIGNER USING THE SAME
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