Patent ID: 8203694
Filing Date: 2012-06-19
Classification: F16F,G03F

Abstract:
1. A lithographic apparatus comprising: an illumination system configured to condition a radiation beam; a support configured to support a patterning device, the patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table configured to hold a substrate; a projection system configured to project the patterned radiation beam onto a target portion of the substrate; and an active damping system configured to dampen a vibration of at least part of the projection system, the active damping system comprising: a sensor configured to provide a signal based on a measured position quantity of a damping mass connected to the projection system; and an actuator connected to the damping mass and configured to exert a force on the projection system through the damping mass in response to the signal provided by the sensor.