Glass sheet having high near-infrared transmittance and very low visibility transmittance

摘要

Glass sheet having high near infrared transmittance and very low visible transparency.The present invention relates toSilicate type glass sheet(I) according to the total weight of the glassIn the content represented as the weight percentageTotal iron (represented as Fe2O3) 0.002-1.1%Manganese (expressed as MnO) ≧ 0.005%And optionallyContains 0 to 1.3% chromium (represented asRepresented as a weight percentageAll ironThe total content of manganese and chromium (Fe2O3 + MnO + Cr2O3) ≧ 1%Ratio R1 < 1, defined as Fe2O3 * / (49 + 0.43 (Cr2O3 * MnO *))Having a composition of ratio R2 < 1 defined as Fe2O3 * / (34 + 0.3 (Cr2O3 * MnO *));HoweverFe2O3 *MnO * and Cr2O3 * areA relative percentage of the total (Fe2O3 + MnO + Cr2O3);It relates to glass sheets.Such glass sheets exhibit essentially very low visible transmittance with high infrared transmittance in the wavelengths of 1000 to 2000 nm, particularly at wavelengths of wavelengths of 1050 nm and 1550 nm, thereby providing automatic operation vehicles, particularly in It is useful in automatic driving car that fully integrates the lidar system.Diagram