Patent ID: 7728252

Claim:
An etching system for etching a substrate, comprising: a substrate electrode on which the substrate is mounted, the substrate electrode being arranged in a vacuum chamber; a high frequency bias power source applying high frequency bias power to the substrate electrode; an etching gas introducing means for introducing etching gas into the vacuum chamber; a floating electrode arranged relative to the substrate electrode; a high frequency power source for applying high frequency power to the floating electrode; a solid material arranged at the side of the floating electrode facing the substrate electrode so as to be sputtered to form an anti-etching film on the substrate; and a control unit for changing between an etching mode in which the substrate is etched by the etching gas and an anti-etching film forming mode in which the anti-etching film is formed on the substrate by sputtering the solid material, the control unit being adapted to control the high frequency power source so as to differentiate the output of the power source at the time of sputtering the solid material and at the time of etching the substrate.