| 摘要 |
PURPOSE:Optical glass suitable for mass production, satisfying optical performance, having >=400 deg.C glass transition temperature, containing AlF3, Al(PO3)3 and CaF2 in a specific ratio. CONSTITUTION:Glass having anomalous dispersion consisting of 35-44mol% AlF3, 1.5-5.5mol% Al(PO3)3, with the proviso that 37.5-46.5mol% AlF3+ Al(PO3)3, 10-43mol% CaF2, 0-18mol% MgF2, with the proviso that 20- 45mol% CaF2+MgF2, 0-30mol% SrF2, 0-25mol% BaF2, with proviso that 17-30mol% SrF2+BaF2, 0-12mol% NaF, 0-12mol% YF3, 0-8mol% LaF3, 0-6mol% EuF3, 0-6mol% GdF3, 0-6mol% TbF3, 0-7mol% DyF3, and 0- 6wt% YbF3. The glass is obtained by melting each of the components at 800- 1,000 deg.C using a device such as a platinum crucible, etc., uniforming it with stirring, casting it into a mold, followed by annealing. |
