Patent ID: 6432286
Filing Date: 2002-08-13
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, said magnetron having an anode and a cathode, said magnetron comprising:a) a frusto-conical target off-spaced from said substrate and having an inner surface for being sputtered, said frusto-conical target being a conical frustum having an axis centrally disposed through first and second parallel planes truncating said frusto-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 surface included in a plane inclusive of said axis; and b) means for plasma sputter erosion of said inner surface at a rate which is uniform over all portions of said surface, said means including a magnetic field having magnetic field lines passing within a distance from said target surface equal to the radius of gyration of an electron about one of said magnetic field lines, all of said field lines intersecting surfaces held at a substantially negative voltage with respect to said anode, and the vector component of said field lines which is parallel to the target surface being of uniform flux density over all points on the target surface.