Patent ID: 6066242
Filing Date: 2000-05-23
Classification: C23C,H01J

Abstract:
A magnetron for sputtering a target material onto a substrate having a radius R to form a coating of the target material upon a surface of the substrate, comprising:a) a frusto-conical target off-spaced from said substrate and having an inner surface for being sputtered, said conical target being a conical frustum having an axis centrally disposed through first and second parallel planes truncating said conical target to define respectively larger and smaller openings in said target, said target having a frustum length determinable along said inner surface between said openings and having an included cone angle defined by the angle between the locus of opposite sides of said inner surface included in a plane inclusive of said axis;b) a first electrode disposed adjacent said conical target opposite said inner surface;c) a magnetic cage receivable of said frusto-conical target and said first electrode for providing a magnetic field between said inner surface and said substrate surface, said magnetic field containing field lines of magnetic flux, said magnetic cage including first and second pole pieces disposed substantially orthogonal to and extending inwardly of said inner surface, said magnetic cage including a conical magnet which tapers in magnetic strength between its outer and inner radii; andd) a second electrode disposed adjacent said magnetic cage for cooperating with said first electrode and said magnetic cage to provide an electric plasma over said inner surface.