Patent ID: 6038013
Filing Date: 2000-03-14
Classification: G03F

Abstract:
A vibration isolator which reduces vibrations and inclination generated by a moving body stage, the vibration isolator comprising:at least three vibration isolating pads;a vibration isolating stand support held in a substantially horizontal position by the vibration isolating pads;actuators capable of driving the vibration isolating stand, each of said actuators having a movable member and a stator;displacement sensors capable of detecting displacement of the vibration isolating stand;vibration sensors capable of detecting vibration of the vibration isolating stand, said vibration sensors being fixed to the vibration isolating stand;a control mode unit of the vibration isolating stand capable of selecting a control mode for the vibration isolating stand from a plurality of control modes in which an error tolerance in a control is changed based on an operating mode of the moving body stage; anda first control system, connected to said control mode unit, capable of controlling the actuators based on outputs of the displacement sensors and the vibration sensors in accordance with the selected control mode.