OPTICAL GLASS COMPOSITION, PREFORM, AND OPTICAL ELEMENT

PROBLEM TO BE SOLVED: To provide a high refractive index-lower to middle dispersion type optical glass composition that has nd within a high refractive index range of 1.83-1.87 and νd within a range of 43-47, and yet shows excellent melting property, processability (droplet property), crystallinity...

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Bibliographische Detailangaben
1. Verfasser:	ONODA MINORU
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS METALLURGY MINERAL OR SLAG WOOL OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a high refractive index-lower to middle dispersion type optical glass composition that has nd within a high refractive index range of 1.83-1.87 and νd within a range of 43-47, and yet shows excellent melting property, processability (droplet property), crystallinity and the like. SOLUTION: The optical glass composition contains, in % by mole, 5.0-25.0% SiO2, 20.0-40.0% B2O3, 0-15.0% ZnO, 0-5.0% ZrO2, 10.0-25.0% La2O3, 0-5.0% Ta2O5and 5.0-20.0% Gd2O3, satisfies a molar ratio of SiO2/B2O3of 0.25-0.90, does not substantially contain Li2O, and has a refractive index (nd) to the d-line of 1.83-1.87, an Abbe number (νd) to the d-line of 43-47 and a liquidus temperature of ≤1,300°C. A preform and an optical element are also provided. COPYRIGHT: (C)2010,JPO&INPIT