Patent ID: 7112809

Claim:
Ion implantation apparatus comprising: an ion source that emits ions generated from a source material; a mass discriminating magnet that bends ions away from a trajectory along a path of ion travel downstream from the ion source; an ion scanner positioned to intercept ions subsequent to the mass discriminating magnet to scan ions from side to side in a controlled manner to form an ion beam having a width; a lens structure which defines a region into which the ions pass that deflects ions away from an initial trajectory downstream from the scanner as they enter the lens structure; said lens structure including a lens electrode pair that either accelerates or decelerates said ions; wherein the electrodes in said lens electrode pair are spaced apart along a direction of ion movement which extends across a width of the ion beam to deflect ions entering the lens structure; and a lens structure mode controller that switches a biasing voltage that is applied to the lens structure between a voltage that tends to accelerate the ions and a voltage that tends to decelerate the ions to cause ions entering the lens structure to exit said lens structure with a desired exit trajectory.