Patent ID: 7884918

Claim:
An exposure apparatus which projects a pattern of a reticle onto a substrate via a projection optical system to scan-expose the substrate, the apparatus comprising: a driving mechanism which scans a substrate stage that holds the substrate in a first direction perpendicular to an optical axis direction of the projection optical system, and moves the substrate stage in steps in a second direction perpendicular to the optical axis direction and the first direction; a first measurement device which measures a position of the substrate stage in the optical axis direction of the projection optical system when said driving mechanism scans the substrate stage in the first direction; a second measurement device which measures surface positions of the substrate in the optical axis direction of the projection optical system at a plurality of measurement points on one straight line extending in the second direction on the substrate; and a controller, wherein said controller controls said second measurement device to measure at least one identical region on the substrate at different measurement points of the plurality of measurement points both before and after the substrate stage moves in steps in the second direction, and calculates a measurement error of said first measurement device attributed to the driving of the substrate stage in the second direction based on the measurement result obtained by said second measurement device.