ALTERNATING ANODE ELECTROPLATING
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-17
The circuits on a simple two layer print and etch board are made in three main steps. First, an epoxy/fiberglass panel, with 0.5 to 0.7 mils of copper foil on each side, is drilled to allow top to bottom access. Second, the drilled holes (and the original cop- per foil) are electroless plated and then electroplated with copper; this forms the vertical electrical connec- tions. Third, a polymer etch resist is applied and photo defined into the pattern of circuits, and the exposed copper is etched away; at this point all the copper cir- cuits are complete. After these circuit forming processes are completed, the remaining etch resist is dissolved away, and solder mask can be applied to pro- tect selected areas of the panel.