Abstract:
PROBLEM TO BE SOLVED: To provide a lithographic apparatus which decreases disturbance of a projection system due to the scanning power of a movable object. SOLUTION: The lithographic apparatus includes: an illumination system configured to condition a radiation beam; a patterning device support constructed to support a patterning device capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table WT constructed to hold a substrate; a projection system PS configured to project the patterned radiation beam onto a target portion of the substrate; an active air mount AM supporting the projection system PS and including at least one actuator; and a feed-forward device FD configured to provide a feed-forward signal to the at least one actuator on the basis of a set-point signal of a movable object, wherein the feed-forward signal is designed to decrease a disturbance effect on the projection system PS due to movement of the movable object. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a positioning system in which vibrations caused by a torque transferred from a balance mass to a base plate are minimized. SOLUTION: The positioning system to position a table within a base frame of a lithographic apparatus includes a first actuator for exerting an actuation force on the table, and being connected to a first balance mass constructed and arranged to absorb a reaction force of the first actuator, and the positioning system includes a controller and a second actuator constructed and arranged to exert a compensation force and/or torque to compensate a torque caused by the actuation force exerted by the first actuator on the first balance mass. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a positioning system improved in position accuracy, and also to provide lithographic equipment reduced in overlay error and/or problem with image formation. SOLUTION: The lithographic equipment includes a positioner which positions the first section of the equipment relative to the second position of the equipment, the positioner includes a motor having a motor constant which depends on a motor position which defines the relationship between a motor input and a motor output, and a control system which drives the motor, the control system includes a set point generator which provides a reference signal based on a desired position of the first section relative to the second position, and a controller which provides a drive signal to the motor based on the reference signal, and the controller includes a compensator which at least partially compensates the drive signal for the motor constant depending on a motor position. The present invention relates to a positioner, a method for optimizing the positioning system, and a method for deriving a motor constant depending on a motor position. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
A positioning system to position a table within a base frame of a lithographic apparatus, the positioning system including: a first actuator to exert an actuation force on the table, the first actuator being connected to a first balance mass constructed and arranged to absorb a reaction force of the first actuator, wherein the positioning system includes a controller and a second actuator constructed and arranged to exert a compensation force and/or torque to compensate a torque caused by the actuation force exerted by the first actuator on the first balance mass.