Patent ID: 7705964

Claim:
An exposure system for exposing a substrate to radiation, said system comprising: an exposure unit configured to expose the substrate to radiation; an exposure chamber configured to accommodate said exposure unit; an alignment measurement unit arranged outside said exposure chamber and configured to measure a position positions of a plurality of alignment mark marks, on the substrate, arranged to obtain alignment information that specifies positions of a plurality of shot regions arranged on the substrate; a load-lock chamber arranged between said exposure chamber and said alignment measurement unit; and further comprising an alignment score arranged in at least one of said load-lock chamber and said exposure chamber and configured to measure positions of the alignment marks, and a controller configured to calculate a position of a region to be exposed to radiation on the substrate based on a first measurement performed by said alignment measurement unit and a second measurement performed by said alignment scope, wherein said alignment scope measures positions of the alignment marks fewer than the alignment marks of which positions said alignment measurement unit measures.