Patent ID: 7449220

Claim:
A method for manufacturing a plate-shaped workpiece comprising: providing a vacuum recipient with two mutually facing electrode surfaces, one of said electrode surfaces being of a dielectric material, the other of said electrode surfaces being of a metal; providing a substrate of dielectric material having opposed surfaces and comprising along one of said opposed surfaces a coating of a material having a specific resistance ρ for which there is valid: 10 −5 Ωcm≦ρ≦10 −1 Ωcm said coating being so that the resulting surface resistance R S of said coating is: 0≦R S ≦10 4 Ω □ ; depositing said coated substrate on said other electrode surface; establishing between said electrode surfaces an electric Rf field; inletting into said vacuum recipient through a multitude of openings in said one electrode surface, a reactive gas; establishing a locally varying electrical Rf potential along said one electrode surface; thereby etching or coating said substrate.