Patent ID: 6872958
Filing Date: 2005-03-29
Classification: G03F,H01J,H01L,Y10T

Abstract:
1. A platform positioning system comprising: a frame; a stage comprising a base, a platform and stage actuators, wherein said stage actuators are coupled to said platform, said base and said frame, and wherein said frame is attached to said base; a support structure mechanically coupled to said frame; stage sensors attached to said support structure, said stage sensors being configured to sense the position of said platform relative to said support structure; and a current control system coupled to said stage actuators and said stage sensors, said control system being capable of controlling precise positioning and movement of said platform relative to said support structure, said control system comprising a conversion matrix coupled to said stage sensors into, said conversion matrix being capable of converting signals from said stage sensors into coordinates representing the sensed position of said platform relative to said support structure, said control system further comprising a predictor coupled to the output of said convension matrix, said predictor being capable of generating an output signal anticipating the actual position of said platform relative to said support structure from coordinates provided by said conversion matrix.