Patent ID: 9208991
Filing Date: 2015-12-08
Classification: H01J

Abstract:
1. An ion implantation apparatus including a scanning unit, the scanning unit comprising: a scanning electrode device that allows a deflecting electric field to act on an ion beam incident along a reference trajectory and scans the ion beam in a horizontal direction perpendicular to the reference trajectory, and a downstream electrode device disposed downstream of the scanning electrode device and provided with openings through which the ion beam scanned in the horizontal direction passes, wherein the scanning electrode device includes a pair of scanning electrodes disposed to face each other in the horizontal direction with the reference trajectory interposed therebetween, and the downstream electrode device includes an electrode body configured such that, with respect to an opening width in a vertical direction perpendicular to both the reference trajectory and the horizontal direction and/or an opening thickness in a direction along the reference trajectory, the opening width and/or the opening thickness in a central portion in which the reference trajectory is disposed is different from the opening width and/or the opening thickness in the vicinity of a position facing a downstream end of the scanning electrode.