METHOD OF COATING A TRANSPARENT SUBSTRATE

摘要

Optical filters, e.g. for reflecting infrared radiation while passing visible light radiation made by applying to the silver reflective coating a protective coating of a metal oxide by magnetron cathode sputtering and only thereafter is the non-reflec-tive layer applied by magnetron cathode sputtering. The protective coating-oxygen partial pressure and coating rate are substantially less than the non-reflective coating-oxygen partial pressure and coating rate. Apparently the protective coating prevents damage to the reflective coating.