摘要:
The invention relates to a system (1) for detecting motion of a body (2), said body comprising a first diffraction pattern (3A) and a second diffraction pattern (3B) with a predetermined orientation relative to said first diffraction pattern. The system comprises optical means (4A, 4B) adapted to provide at least a first incident beam to said first diffraction pattern to obtain a first diffracted beam from said first diffraction pattern and at least a second incident beam, with a predetermined orientation relative to said first incident beam, to said second diffraction pattern to obtain a second diffracted beam from said second diffraction pattern. The system has means for detecting motion of said body on the basis of the phase difference between at least one of said first diffracted beam and said second diffracted beam. Accordingly a larger in-plane rotation range is obtained for detecting motion of the body (2). The invention also relates to a wafer (2) provided with two-dimensional diffraction patterns (3A,3B) and a method for detecting motion of a body.
摘要:
The invention relates to a system (1) for detecting a translation (T) of a body (2) with a diffraction pattern (3) applied to said body. The system comprises means (4) for providing an incident light beam (I) to said diffraction pattern and to obtain a diffracted light beam (D) from said diffraction pattern; means (4) for measuring a phase difference by interference between said incident light beam and said diffracted beam an means (4) for detecting said translation on the basis of said measured phase difference. The invention further relates to a method for detecting a translation of a body (2); a redirection arrangement 6 and a frequency multiplexing system.
摘要:
An ironless linear motor (5) comprising a magnet track (53) and a coil assembly (50) operating in cooperation with said magnet track (53) and having a plurality of concentrated multi-turn coils (31 a-f, 41 a-d, 51 a-k), wherein the end windings (31E) of the coils (31 a-f, 41 a-e) are substantially rounded, the coil part (31 S) between the end windings (31E) is straight and the coils (31 a-f, 41a-d, 51a-k) are arranged in an overlapping manner, wherein the end windings (31E) are pressed together, is provided. The coil assembly has the advantage to be flat, thus being easy to handle, and leading to a high steepness.
摘要:
A apparatus processes an object (19), such as a semi-conductor wafer at accurately controlled positions. The object (19) is supported by a working platform (12) that is moveable along a path. A suspension actuator part (14) attached to the working platform (12), contains a soft magnetic core (24) with poles facing the surface of a soft magnetic element (34) on the support structure along the path and a winding (20) for application of a current to generate a magnetic field that runs through the core (24) v the poles and returns via the soft magnetic element (34). A sensor (17) senses a measured position of the suspension actuator part (14) relative to the position reference element (16). A control circuit comprises an outer control circuit (40) and an inner control circuit (42). The outer control circuit (40) receives a sensing result and determines force set point information to regulate the measured position of the actuator part (14) to a required value. The inner control circuit (42) receives the force set point information and controls the current to realize a force between the actuator part (14) and the support structure (10) according to the force set point information.
摘要:
A displacement apparatus comprising a first part and a second part, which can be displaced relative to each other in first and second different directions. The apparatus being suitable for use in a lithographic apparatus for positioning the mask holder with respect to the projection beam and for positioning the wafer substrate table with respect to the patterned beam. The first part comprises a first and second coil system in which an alternating current is provided by a power supply. The second part comprises a conductive platen which is disposed in a zone in which a magnetic field is induced when power is supplied to the coil systems. The coil system and platen are arranged with respect to each other so that when currents are passed through the coils, a magnetic field induced in the platen causes displacement between the platen and the coils in the first and second different directions.
摘要:
A coil for use in an actuator in a lithographic projection apparatus. The coil is formed of a strip of electrically conducting sheet-material that is wound round a winding axis. Respective turns of the strip of sheet-material are separated by an electrically non-conducting layer.