OPTICAL GLASS AND OPTICAL ELEMENT

• Main Authors: OGINO MICHIKO, TSUCHIBUCHI NANA
• Format: Patent
• Language: English; Japanese
• Published: 09.04.2015
• Subjects: 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

PROBLEM TO BE SOLVED: To provide an optical glass and an optical element capable of reducing surface roughness and clouding while having a desired high transmittance and high dispersion.SOLUTION: The optical glass comprises, with respect to the total mass of the glass in terms of an oxide composition represented by mass%, 5.0% or more and 40.0% or less of a POcomponent, 10.0% or more and 60.0% or less of a NbOcomponent, and 5.0% or more and 45.0% or less of a TiOcomponent, and contains a SbOcomponent by 1.0 mass% or less of an external percentage with respect to an oxide-basis mass of the glass. The optical element is obtained from the above optical glass as a base material. 【課題】所望の高透過率及び高分散を有しながらも、表面の凹凸及び曇りを低減することのできる光学ガラス及び光学素子を提供する。【解決手段】この光学ガラスは、酸化物換算組成のガラス全質量に対して、質量％でＰ２Ｏ５成分を５．０％以上４０．０％以下、Ｎｂ２Ｏ５成分を１０．０％以上６０．０％以下、及びＴｉＯ２成分を５．０％以上４５．０％以下含有し、酸化物基準の質量に対する外割りの質量％でＳｂ２Ｏ３成分が１．０質量％以下である。また、光学素子は、この光学ガラスを母材とするものである。【選択図】なし