OPTICAL GLASS, OPTICAL ELEMENT AND PREFORM

PROBLEM TO BE SOLVED: To provide an optical glass capable of reducing a breakage or a crack of a glass at a press molding and enhancing productivity of an optical element while having a desired high refraction index and an Abbe number, and to provide a preform and an optical element using the same.S...

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Hauptverfasser:	NOJIMA HIROTO, KAWANAKA YUJI, MAEKAWA KIMITAKA
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 an optical glass capable of reducing a breakage or a crack of a glass at a press molding and enhancing productivity of an optical element while having a desired high refraction index and an Abbe number, and to provide a preform and an optical element using the same.SOLUTION: An optical glass contains Pand Alas a cation component and Oand Fas an anion component, and has a refraction index (nd) of 1.50 or more, the maximum value of a linear expansion coefficient (α) in a temperature range between a glass transition point (Tg) and a yield point (At) of 1500×10Kor less.