Abstract:
PROBLEM TO BE SOLVED: To dispense with an actuator for accurately positioning, without deteriorating accuracy in positioning of an actuator driven assembly. SOLUTION: In order to obtain a high acceleration and high traveling speed of a pattern support or a substrate table of a lithography apparatus, one of the pattern support and the substrate table is supported by an actuator for relatively larger displacement, and the actuator for accurately positioning is dispensed with. The other of the pattern support and the substrate table is supported by the actuator assembly including the actuator for accurately positioning and the actuator for relatively larger displacement. By providing a control system adapted to align the other of the pattern support and the substrate table, so that the positioning error of one of the pattern support and the substrate table is compensated by the positioning of the other, a positioning accuracy of the pattern forming apparatus and the substrate is achieved. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a lithographic apparatus provided with an improved motion control system for controlling the movement of a movable target object, where at least one of a patterning device and a supporting part of a substrate can be moved for instance. SOLUTION: The motion control system comprises a control device having a transfer function. The control device controls the position of a movable target object along a plurality of continuous positions. The transfer function is constituted of a sum of a plurality of position transfer functions each of which is determined in each of these positions, and each position transfer function is multiplied by a weighting function. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
A lithographic apparatus includes a support constructed to support a patterning device, the patterning device being capable of imparting a radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table constructed to hold a substrate on a central area; and a projection system configured to project the patterned radiation beam onto a target portion of the substrate in a first direction. The apparatus further includes a positioning device to position the substrate table, wherein the positioning device includes a plurality of actuators arranged to, in use, exert forces to position the substrate table, the forces substantially being directed in a plane substantially perpendicular to the first direction and wherein the plurality of actuators are arranged outside a central volume of the substrate table, the central volume being obtained by projecting the central area along the first direction.
Abstract:
To enable high acceleration and high moving speed of a pattern support (PS) or a substrate table (ST) of a lithographic apparatus, one of the pattern support and the substrate table is supported by an actuator (SLS,PLS) for relatively large displacements, whereas an actuator (SV,PV) for accurately positioning is omitted. The other one of the pattern support and the substrate table is supported by an actuator assembly including an actuator for accurate positioning and an actuator for relatively large displacements. An alignment accuracy of a patterning device and a substrate is achieved by providing a control system that is adapted to position the other one of the pattern support and the substrate table such that a positioning error of the one of the pattern support and the substrate table is compensated by the positioning of the other one.