Patent ID: 6722022
Filing Date: 2004-04-20
Classification: H01J,H01L,Y10T

Abstract:
An apparatus for calibrating a position of a wafer platform in an ion implanter comprising:a curvilinear piece formed of a first rigid material, said curvilinear piece having a half-circular shape, a predetermined thickness, a predetermined depth, an inside diameter, an inside peripheral surface, a first open end and a second open end, said inside diameter being substantially equal to an outside diameter of said wafer platform such that said inside peripheral surface intimately engages an outside peripheral surface of said wafer platform when said wafer platform is properly calibrated at a zero-angle position; a first and a second linear rod formed of a second rigid material and having equally a first length, a rectangular cross-section, two front ends and two backends, said two front ends having a thickness substantially equal to said predetermined thickness of said curvilinear piece for mounting said curvilinear piece thereon by engaging said first and second open end of said curvilinear piece, said curvilinear piece having a plane along radial direction that is perpendicular to a plane of said first and second linear rod along a longitudinal direction when said curvilinear piece is mounted to said first and second linear rod, said first length being substantially equal to a distance between a plane of said wafer platform and a plane of an ion emitter for said implanter such that when the position of said wafer platform is properly calibrated at a zero-angle position, said first and second linear rod fit snugly on said implanter; and at least one cross-bracing rod connected in-between and juxtaposed to the two backends of said first and second linear rod for providing rigidity of said apparatus.