Patent ID: 7495241
Filing Date: 2009-02-24
Classification: G21K,H01J

Abstract:
1. An ion beam irradiation apparatus comprising: a plasma generation chamber in an interior of which a plasma is generated; a process chamber connected with said plasma generation chamber; a plurality of grids disposed between said plasma generation chamber and said process chamber to extract ions in said plasma from said plasma generation chamber to said process chamber, each of said grids having a plurality of holes; and an insulating spacer disposed between said grids for preventing said grids from being in electrical contact with each other, wherein a groove portion is formed along a circumference, which is different from surfaces abutting said grid, of said insulating spacer, said groove portion is recessed from said circumference of said insulating spacer in a direction different from a direction in which said ion beam is extracted, and a ratio of an opening of said groove portion to a depth of said groove portion is equal to or larger than 1, said groove portion is recessed from said circumference of said insulating spacer in a direction perpendicular to the direction in which said ion beam is extracted, and an edge portion of said groove portion that defines said opening of said groove portion is chamfered.