OPTICAL GLASS COMPOSITION, PREFORM, AND OPTICAL ELEMENT

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 1.83-1.86 and νd within a range of 43-46, 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
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
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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 1.83-1.86 and νd within a range of 43-46, and yet shows excellent melting property, processability (droplet property), crystallinity and the like. SOLUTION: The optical glass composition contains, in % by mole, 0-10.0% SiO2, 35.0-45.0% B2O3, 0-5.0% Li2O, 0-12.0% ZnO, 0-10.0% ZrO2, 10.0-20.0% La2O3, 3.0-10.0% Ta2O5, 10.0-22.0% Ta2O5+ZnO and 5.0-20.0% Gd2O3, and has a refractive index (nd) to the d-line of 1.83-1.86, an Abbe number (νd) to the d-line of 43-46 and a liquidus temperature of ≤1,200°C. A preform and an optical element are also provided. COPYRIGHT: (C)2010,JPO&INPIT