Patent ID: 8601978

Claim:
A substrate processing apparatus capable of applying an ion beam to a substrate including an opening to perform predetermined processing, the apparatus comprising: a first ion beam generator including a first extraction mechanism for extracting ions in a plasma; and a second ion beam generator including a second extraction mechanism for extracting ions in a plasma, the second ion beam generator being arranged opposite the first ion beam generator, wherein each of the first ion beam generator and the second ion beam generator is arranged so as to apply an ion beam to a whole area of the substrate held in a region between the first ion beam generator and the second ion beam generator; the first extraction mechanism includes a first grid, and the second extraction mechanism includes a second grid; the first extraction mechanism and the second extraction mechanism align with each other and are arranged so as to align with the substrate; and wherein at least a center region of the first grid and at least a center region of the second grid are configured so as to be asymmetrical to each other such that an ion beam emitted from a pore in the center region of the first grid does not pass through a pore in the center region of the second grid.