OPTICAL GLASS AND LENS

PROBLEM TO BE SOLVED: To provide glass having higher refractive index to obtain a lens having a larger numerical aperture. SOLUTION: The optical glass contains, by mol.%, 20-70 B2O3, 5-25 ZnO, 5-30 La2O3, 1-20 Ga2O3, 0-15 Li2O, 0-20 GeO2, 0-10 Y2O3, 0-20 TeO2, 0-20 (ZrO2+In2O3+Gd2O3+Ta2O3), wherein...

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Bibliographische Detailangaben
Hauptverfasser:	SUGIMOTO NAOKI, KOBAYASHI TOMOYUKI, MATSUMOTO SHUJI, SASAI ATSUSHI
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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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide glass having higher refractive index to obtain a lens having a larger numerical aperture. SOLUTION: The optical glass contains, by mol.%, 20-70 B2O3, 5-25 ZnO, 5-30 La2O3, 1-20 Ga2O3, 0-15 Li2O, 0-20 GeO2, 0-10 Y2O3, 0-20 TeO2, 0-20 (ZrO2+In2O3+Gd2O3+Ta2O3), wherein (Ba2O3+GeO2) is 30-70%, and the refractive index of light ray in 633 nm wavelength is ≥1.70. In the optical glass, the glass transition point is ≤650°C, the internal transmittance of light ray at 400-800 nm wavelength is ≥98% in 1 nm thickness. The lens is formed from the optical glass. COPYRIGHT: (C)2005,JPO&NCIPI