Patent ID: 9190239
Filing Date: 2015-11-17
Classification: C23C,H01J

Abstract:
1. A plasma immersion ion milling apparatus, comprising: a vacuum chamber which is electrically insulated and in which plasma is distributed; a rotary support on which a workpiece having a cylindrical shape is placed and which is disposed in the vacuum chamber; a rotating element which is disposed in the vacuum chamber to rotate the rotary support; a housing including a slot part disposed along a surface of a workpiece on at least one side thereof, being conductive, enclosing the workpiece to isolate the workpiece from plasma, and electrically connected to the workpiece; and a power source for supplying power to the workpiece and the housing, wherein a bias which is negative compared to a plasma potential is applied to the workpiece and the housing, the housing functions as an extracting electrode with the slot part, and ions accelerated within a sheath formed around the housing are extracted into a space between the housing and the workpiece through the slot part of the housing and thus bombard the workpiece that is rotating, thereby polishing the surface of the workpiece, wherein the housing has a rectangular cross-section with two slot parts on each of four sides thereof so that impinging ions are glancingly incident on the cylindrical surface of the workpiece, and wherein the slot part is positioned such that ions passing through the slot part bombard the workpiece directly and is positioned toward the outside portion of the cylindrical surface of the workpiece, the outside portion being opposite to the housing surface having two slot formed thereon.