Patent ID: 6159354
Filing Date: 2000-12-12
Classification: C25D

Abstract:
A method of treating a surface of a substrate comprising:providing a cup attached to a flange, said cup having an inner perimeter which defines a cup central aperture, said flange comprising an annulus;mounting said substrate in said cup so that said substrate surface is exposed through said cup central aperture;placing said cup and flange into a plating solution, said plating solution contacting said substrate surface;producing an electric current between said substrate surface and an anode in said plating solution, said electric current being represented by electric current flux lines, the spacing between the flux lines being proportional to the magnitude of the electric current; andpositioning said flange to reduce the spacing of the electric current flux lines adjacent an inner perimeter of said annulus while allowing said flux lines to spread out adjacent an edge region of said substrate surface such that said flux lines are substantially uniformly spaced across said substrate surface.