Patent ID: 6156464
Filing Date: 2000-12-05
Classification: B82Y,G03F,H01J,Y10S

Abstract:
In a method for performing microlithography of a pattern onto a substrate, using a charged particle beam, wherein at least the substrate is mounted on a movable stage, the microlithography being performed by scanningly moving the stage at a stage velocity while continuously transferring successive portions of the pattern to the substrate using the charged particle beam, an improvement comprising:detecting actual stage velocity of the stage;comparing the actual stage velocity against a pre-set stage-velocity limit above which continuous transfer of the pattern portions is impossible, and against a pre-set specified stage velocity less than but near the stage-velocity limit;reducing the stage velocity if the actual stage velocity is less than the stage-velocity limit but greater than the specified stage velocity; andperforming exposure of the pattern onto the substrate.