Method of coating a transparent substrate

US4497700A · kind A · utility

Assignee

• Flachglas Aktiengesellschaft · DE

Inventors

• Rolf Groth · Bochum, DE
• Dieter Muller · Badenhausen, DE

Key dates

• Filing date: Mar 22, 1984
• Grant date: Feb 5, 1985
• Expiry date: Mar 22, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2217/732
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

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