Patent ID: 8994924
Filing Date: 2015-03-31
Classification: G03F

Abstract:
1. An exposure apparatus that exposes a substrate with illumination light via a projection optical system, the apparatus comprising: a base member placed under the projection optical system and having a surface substantially parallel to a predetermined plane which is orthogonal to an optical axis of the projection optical system; a substrate stage that is placed on the base member and holds the substrate, the substrate stage having a drive system that has an electromagnetic motor and drives the substrate stage; a measurement system that has a head section placed lower than the measurement surface under the projection optical system and measures positional information of the substrate stage by irradiating the measurement surface with a measurement beam from below via the head section that is placed in the space as the substrate stage is positioned to face the projection optical system; and a controller coupled to the drive system and controlling a drive of the substrate stage by the electromagnetic motor based on the positional information measured by the measurement system.