Patent ID: 8753475
Filing Date: 2014-06-17
Classification: H01J

Abstract:
1. A plasma processing apparatus comprising: a processing chamber having a top opening; a dielectric which has inclined surfaces on a bottom surface thereof so that a thickness dimension of the dielectric is successively varied, and is disposed so as to close the top opening of the processing chamber; and an antenna disposed on a top surface of the dielectric, for supplying microwave to the dielectric, thereby generating plasma at the bottom surface of the dielectric, wherein a ring-shaped groove is formed in the bottom surface of the dielectric, and the inclined surfaces serve as an inner peripheral sidewall surface and an outer peripheral sidewall surface of the ring-shaped groove, if a radius of the dielectric is R, the ring-shaped groove is located only outside a position corresponding to R/4 from a center of the dielectric, the antenna is provided with a plurality of inner slot pairs and a plurality of outer slot pairs, the outer slots of the inner slot pairs are positioned uprightly above the inner peripheral sidewall surface of the ring-shaped groove, and outer slots of the outer slot pairs are positioned uprightly above the outer peripheral sidewall surface of the ring-shaped groove.