Patent ID: 8570487
Filing Date: 2013-10-29
Classification: G02B,G03F

Abstract:
1. A lithographic apparatus arranged to transfer a pattern from a patterning device onto a substrate, the apparatus comprising: a patterning subsystem constructed and arranged to receive said patterning device and to apply said pattern to a portion of said substrate held at a patterning location; a substrate support constructed and arranged to hold the substrate while said pattern is applied; at least one positioning subsystem constructed and arranged to move said substrate support, said patterning subsystem and said patterning device relative to each other in a sequence of movements such that said pattern is applied repeatedly at a plurality of desired portions of the substrate, the location of each portion being defined accurately with respect to alignment marks present on the substrate; and a measuring subsystem constructed and arranged to measure the locations of said alignment marks relative to the patterning device, and to supply measurement results to said positioning subsystem, wherein said measuring subsystem comprises one or more alignment sensors directed at the substrate, wherein each alignment sensor is operable in the course of said sequence of movements to recognize and measure alignment marks on the substrate to generate updated measurements, and wherein said positioning subsystem is operable to use said updated measurements in combination with previous measurements in positioning said substrate support, said patterning subsystem and said patterning device relative to each other for the applying of said pattern to a subsequent substrate portion.