Patent ID: 8781775
Filing Date: 2014-07-15
Classification: G03F

Abstract:
1. A lithographic apparatus comprising: a stage configured to hold an object, the stage being moveable relative to a reference structure in a motion range; a magnet structure configured to provide a spatially varying magnetic field in at least a part of the motion range, the magnet structure being moveable relative to the reference structure and the stage, and the stage being moveable over the magnet structure; a first position measurement system configured to provide a first measurement signal corresponding to a position of the stage, or the object, or both the stage and the object, in a measurement direction relative to the reference structure; a second position measurement system configured to provide a second measurement signal corresponding to a position of the stage relative to the magnet structure; and a data processor configured to correct the first measurement signal with a value which is dependent on the second measurement signal to provide a corrected first measurement signal representative of the position of the stage, or the object, or both the stage and the object, relative to the reference structure in the measurement direction.