HEAT REFLECTING GLASS AND PROCESS FOR PRODUCING HEAT REFLECTING GLASS

摘要

To provide a heat reflecting glass provided with at least a chromium nitride film, which has a visible light transmittance Tv of at most 35% and a solar transmittance Te/visible light transmittance Tv ratio of less than 1.0 and which undergoes substantially no change in the optical properties even when subjected to heat treatment for strengthening or bending. An oxygen-blocking undercoat film made of silicon nitride is formed on the surface of a glass substrate; a chromium nitride film for heat reflection is formed as an upper layer of the oxygen-blocking undercoat film; and further, an oxygen-blocking protective film made of silicon nitride is formed as an upper layer of the chromium nitride film. The ratio in the number of atoms of nitrogen to chromium in the chromium nitride for heat reflection is from 20% to 60%.