Patent ID: 7491301

Claim:
A method of depositing film onto two sides of a single pane of glass in a single pass through a coating apparatus, comprising: providing a sheet of glass having a clean interior surface and a clean exterior surface; providing a sputtering line comprising a series of sputtering chambers, the sputtering line having a plurality of transport rollers for conveying the glass sheet along the sputtering line, the sputtering line having an upper target positioned above the transport rollers and a lower target positioned below the transport rollers, wherein the upper and lower targets are rotary targets; positioning the sheet of glass on the transport rollers such that the interior surface is oriented toward the upper target and sputtering the upper target to deposit a coating directly on one of the interior surface of the glass or a film stack layer previously deposited on the interior surface of the glass; positioning the sheet of glass on the transport rollers such that the exterior surface is oriented toward the lower target and sputtering the lower target to deposit a coating on one of the exterior surface of the glass or a film stack layer previously deposited on the exterior surface of the glass; wherein the glass sheet is conveyed over the transport rollers such that the coating on the exterior surface of the glass sheet comes into direct contact with the transport rollers, and wherein the glass sheet is coated on both the interior surface and the exterior surface while maintaining a constant orientation wherein the interior surface is positioned above the exterior surface.