Patent ID: 6584367
Filing Date: 2003-06-24
Classification: G05B

Abstract:
A stage position control method, applied to a stage device comprising a stage, a driving axis which mounts said stage and which is driven in one axial direction, and first and second driving units for performing translational driving of said driving axis independently at two positions, said method comprising the steps of detecting the amount of movement of said first and said second driving units by first and second position detecting units, respectively, and controlling said first and said second driving units with first and second feedback control systems, respectively;wherein said first feedback control system outputs a translational thrust command value to said first and said second driving units, by receiving an average value of each position detecting value measured by said first and said second position detecting units as a position feedback value of the stage translational direction; and wherein said second feedback control system divides the motion of said stage into translational direction motion and yawing direction motion, and independently performs controlling and compensating thereof, by receiving the difference between said each position detecting value as a position feedback value of the stage yawing direction, and by outputting a yawing direction thrust command value to said first and said second driving units.