Patent ID: 9455125
Filing Date: 2016-09-27
CPC Classification: H01J

Claim Text:
1. A plasma processing apparatus for processing a substrate, comprising: a cylindrical chamber configured to receive a substrate; a moving electrode including a shower head and serving as an upper electrode configured to be movable along a central axis of the cylindrical chamber inside the cylindrical chamber, the moving electrode being in a non-contact state with a side wall of the cylindrical chamber; an opposing electrode configured to oppose the moving electrode in the cylindrical chamber; a flexible barrier configured to connect the moving electrode to a top wall at one side of the cylindrical chamber in order to enclose a shaft provided on the moving electrode; and a bypass member including a bellows made of a conductive material configured to be deformed according to a movement of the moving electrode and installed to directly connect the moving electrode to the top wall at one side of the cylindrical chamber so as to remove a potential difference between the moving electrode and either one of the side wall or the top wall of the cylindrical chamber, wherein a high frequency power is applied to the opposing electrode and a processing gas is introduced to a processing space between the moving electrode and the opposing electrode, and the bypass member is disposed on a circumference of a circle having a predetermined diameter, the bypass member being concentric with and surrounding the flexible barrier such that a resonant frequency of the entire moving electrode including the flexible barrier has a value that is controlled not to be overlapped with a frequency of the applied power for generating plasma within an operable range of the moving electrode.