GLASS FOR NEAR-INFRARED ABSORPTION FILTER

• Main Authors: SAWANOBORI SHIGETO, NAKAHATA KOJI, ASO GORO
• Format: Patent
• Language: English; Japanese
• Published: 22.03.2019
• 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

To provide a glass for a near-infrared absorption filter, which has good transmission characteristics for visible light and excellent polishing processability.SOLUTION: The glass for a near-infrared absorption filter has a composition comprising, in terms of mass%, at least POby 65.0% or more and 75.0% or less, AlOby 10.0% or more and 16.0% or less, BOby 1.5% or more and 7.0% or less, LiO by 1.0% or more and 3.5% or less, KO by 2.0% or more and 10.0% or less, RO by 7.0% or more and 13.5% or less, MgO by 0.5% or more and 6.0% or less, and RO by 0.5% or more and 6.0% or less, contains CuO by 4.5% or more and 9.0% or less in an external ratio, satisfies 0.78≤x≤3.00, 0.74≤y≤2.29 and 0.12≤z≤0.24, where x is RO/CuO, y is AlO/RO and z is AlO/(PO+BO).SELECTED DRAWING: Figure 1 【課題】可視光の透過特性が良好である上、研磨加工性に優れる、近赤外吸収フィルタ用ガラスを提供する。【解決手段】質量％で、少なくとも、Ｐ２Ｏ５：６５．０％以上７５．０％以下、Ａｌ２Ｏ３：１０．０％以上１６．０％以下、Ｂ２Ｏ３：１．５％以上７．０％以下、Ｌｉ２Ｏ：１．０％以上３．５％以下、Ｋ２Ｏ：２．０％以上１０．０％以下、Ｒ１２Ｏ：７．０％以上１３．５％以下、ＭｇＯ：０．５％以上６．０％以下、Ｒ２Ｏ：０．５％以上６．０％以下の組成を有し、ＣｕＯを外割りで４．５％以上９．０％以下含み、且つ、Ｒ１２Ｏ／ＣｕＯをｘ、Ａｌ２Ｏ３／Ｒ１２Ｏをｙ、Ａｌ２Ｏ３／（Ｐ２Ｏ５＋Ｂ２Ｏ３）をｚとしたときに、０．７８≦ｘ≦３．００、０．７４≦ｙ≦２．２９、０．１２≦ｚ≦０．２４を満たす、ことを特徴とする、近赤外吸収フィルタ用ガラスである。【選択図】図１