Patent ID: 7759658
Filing Date: 2010-07-20
Classification: H01J

Abstract:
1. An ion implanting apparatus comprising: a beam scanner; a beam collimator; and a unipotential lens which is disposed between said beam scanner and said beam collimator, and which includes first, second, third, and fourth electrodes spaced apart from one another in an ion beam traveling direction such that spaces between adjacent electrodes form first, second, and third gaps, respectively, said first and fourth electrodes being electrically grounded; wherein positions of centers of curvature of said first and third gaps of said unipotential lens coincide with a position of a scan center of said beam scanner, and wherein a position of a center of curvature of said second gap of said unipotential lens is shifted from the position of the scan center of said beam scanner toward a downstream or upstream side in the ion beam traveling direction.