Patent ID: 6617594
Filing Date: 2003-09-09
Classification: H01J,H01L

Abstract:
An ion implantation apparatus comprising:an ion beam generator for generating an ion beam; a wafer support wheel for supporting a wafer to be implanted, said wafer support wheel being rotatable to revolve said wafer so that the ion beam from said ion beam generator scans an entire surface of said wafer; a first drive motor for rotating said wafer support wheel; a swing shaft for supporting said wafer support wheel; a second drive motor for swinging said swing shaft and said wafer support wheel, said second drive motor being able to be driven in forward and backward directions and being adjustable in velocity; and control means for controlling swing velocity of said wafer support wheel by rotating said second drive motor, based on either one of a plurality of basic swing velocity modes preset so as to uniformly implant ions in the entire surface of said wafer, wherein said control means controls rotational velocity of said second drive motor so that either one basic swing velocity mode out of said plurality of basic swing velocity modes is switched to another basic swing velocity mode at a switch position arbitrarily selected in a swing range of said wafer support wheel, thereby forming a plurality of areas of different doses in the surface of said wafer.