OPTICAL GLASS, PREFORM, AND OPTICAL ELEMENT

OPTICAL GLASS, PREFORM, AND OPTICAL ELEMENT

There are provided an optical glass that has a low temperature coefficient of relative refractive index and that can contribute to correction of the influence on image formation characteristics due to temperature change, and a preform and an optical element that use the optical glass.The optical gla...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: IWASAKI Nana
Format: Patent
Sprache:eng ; fre ; ger
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:There are provided an optical glass that has a low temperature coefficient of relative refractive index and that can contribute to correction of the influence on image formation characteristics due to temperature change, and a preform and an optical element that use the optical glass.The optical glass contains, on a mass% basis, 20.0% to 40.0% of a P2O5component, 25.0% to 50.0% of a Nb2O5component, and 3.0% to 30.0% of a total mass (Na2O + K2O), wherein a temperature coefficient (40°C to 60°C) of a relative refractive index (589.29 nm) is in the range of +3.0 × 10-6to -10.0 × 10-6(°C-1).