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,...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KIDO, KAZUHIRO, SUGISAKI, MASAHIKO, MATSUMARU, SHIZUO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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
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Beschreibung
Zusammenfassung:	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.