Patent ID: 9594313
Date: 2017-03-14
CPC Classifications: G01B,G03F,Y10T

Claim:
1. An exposure apparatus that exposes a substrate with an illumination light via a projection optical system, the apparatus comprising: a frame member that supports the projection optical system; a base member placed under the projection optical system and having a surface placed substantially parallel to a predetermined plane orthogonal to an optical axis of the projection optical system; a holding member having a mounting area for the substrate and a measurement plane that is placed lower than the mounting area and has a grating, the holding member being placed on the base member, and the measurement plane being moved with the mounting area according to a movement of the holding member; an exposure station having a first measurement member and a first measurement system, where an exposure process of irradiating the substrate with the illumination light via the projection optical system is performed, the first measurement member being supported by the frame member and having a part placed under the projection optical system, and the first measurement system measuring positional information of the holding member by irradiating a first measurement beam to the grating of the measurement plane from below the holding member via a first head section that is provided at the first measurement member to be placed between the measurement plane and a surface of the base member; a measurement station having a detection system, a second measurement member and a second measurement system, where a measurement process of the substrate by the detection system is performed, the detection system being supported by the frame member away from the projection optical system, the second measurement member being supported by the frame member and having a part placed under the detection system, and the second measurement system measuring positional information of the holding member by irradiating a second measurement beam to the grating of the measurement plane from below the holding member via a second head section that is provided at the second measurement member to be placed between the measurement plane and a surface of the base member; a third measurement system placed between the projection optical system and the detection system, that measures positional information of the holding member during a movement of the holding member from one of the exposure station and the measurement station to the other of the exposure station and the measurement station; and a controller coupled to the first and the second measurement systems, that controls a movement of the holding member based on the positional information measured by the first measurement system in the exposure station and also controls a movement of the holding member based on the positional information measured by the second measurement system in the measurement station.