Patent ID: 6774377
Filing Date: 2004-08-10
Classification: H01J

Abstract:
Ion implantation apparatus comprising:an ion source for emitting ions generated from a source material; a mass discriminating magnet for bending ions away from a trajectory along a path of ion travel downstream from the ion source; a scanning electrode 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; and a lens structure which defines a region into which the ions pass for deflecting ions away from an initial trajectory downstream from the scanning electrode as they enter the lens structure; said lens structure including first and second electrodes spaced apart along a direction of ion movement which extends on opposite sides of a beam path across a width of the ion beam for deflecting ions entering the lens structure; said lens structure including one electrode for accelerating ions and one electrode for decelerating said ions to cause ions entering the lens structure to exit said lens structure with approximately the same exit trajectory regardless of the trajectory ions enter the lens structure.