Patent ID: 6475334
Filing Date: 2002-11-05
Classification: H01J

Abstract:
An inductively coupled plasma dry etching device in which etching is carried out by causing an active gas plasma to act on a wafer secured inside an etching chamber under reduced pressure; wherein:said dry etching device comprises: an etching chamber, a plasma generation means; a wafer securing means; an etching gas supply means; and a gas pressure control means; said plasma generation means includes: two high-frequency power supplies that can be switched; two coils for high-frequency power application that are each connected to a respective one of said two high-frequency power supplies; and a switch for switching two high-frequency power supplies at a prescribed time interval; and said two coils for high-frequency power application are each arranged in proximity to the other such that turns of each coil lie between turns of the other coil.