Use of a glass based on P2O5-BaO-(Al2O3)-(Li2O)-(Na2O)-(K2O)-(MgO)-(CaO)-(SrO)-(ZnO)-CuO as a near infrared absorption filter for colour television cameras

摘要

A near infrared absorption filter for color television cameras, comprising (a) a base glass comprising, in % by weight based on the weight of the base glass, 50-78% P2O5, 10-50% BaO, 0-7% Al2O3, 0-6% B2O3, 0-5% SiO2, 0-8% Li2O, 0-15% Na2O, 0-18% K2O, 0-5% MgO, 0-10% CaO, 0-15% SrO, 0-10% ZnO, and 0-10% PbO, and (b) about 0.5 to about 2.5% by weight of CuO based on the weight of the base glass.