Patent ID: 6242750
Filing Date: 2001-06-05
Classification: H01J

Abstract:
A deceleration and focusing lens for decelerating and focusing an ion beam in an ion implanter, comprising:(i) a first electrode (10) providing a first aperture through which an ion beam may pass, said first electrode residing in a first plane;(ii) a third electrode (12) providing a third aperture through which an ion beam may pass, said first and third apertures aligned with each other so that an ion beam passing through said first aperture may also pass through said third aperture, said third electrode residing in a third plane which is generally parallel to said first plane; and(iii) a second electrode (11) positioned between said first and third electrodes and residing in a second plane which is generally parallel to said first plane and said third plane, said second electrode providing at least a second primary aperture (11-1) and a second secondary aperture (11-2), said second electrode (11) slidable in a direction along said second plane to (a) a first position wherein said second primary aperture (11-1) aligns with said first and third apertures and (b) a second position wherein said second secondary aperture (11-2) aligns with said first and third apertures.