Patent ID: 6791098
Filing Date: 2004-09-14
Classification: F16F,G03F,G05D,H04R

Abstract:
A motion control system for use with a lithography system, said motion control system comprising:a wafer stage base; at least two actuators for controlling motion; at least two sensors for detecting at least one parameter of displacement of said wafer base and producing at least two signals in response thereto; and at least one circuit in electrical communication with said actuators and said sensors; wherein said circuit comprises a computer processor programmed with a multi-input, multi-output control technique selected from the following group of control techniques: linear quadratic Guassian, H-infinity and mu synthesis; wherein, upon the detection of said at least one parameter of displacement by said sensors, said sensors signal said circuit, which, in response, utilizing said control technique activates said actuators to stabilize the wafer stage base to minimize vibration.