Patent ID: 6483571
Filing Date: 2002-11-19
Classification: G03F

Abstract:
An exposure apparatus for transferring a pattern formed on a plurality of masks onto at least one substrate, wherein the masks are exchanged within a predetermined time period, the exposure apparatus comprising:a position sensor that measures relative position information of a plurality of reference marks arranged in correspondence with a plurality of measurement marks on the marks; and a measurement controller, connected to the position sensor, that controls the position sensor with a first position measurement mode that measures plural pieces of first relative position information of the measurement marks and the reference marks and a second position measurement mode that measures second relative position information, the number of which is less than the first relative position information measured by the first position measurement mode, wherein, when the mask subsequent to an exchange matches the mask prior to the exchange during the predetermined time period, the second relative position information is measured by the second position measurement mode, the first relative position information associated with the mask subsequent to exchange is corrected using the second relative position information, and position information of the mask subsequent to the exchange is detected based on the corrected first relative position information.