Patent ID: 8098363

Claim:
An exposure apparatus that exposes a shot region on a substrate to radiant energy based on an obtained position of a surface of the shot region, the exposure apparatus comprising: a projecting optical system configured to obliquely project detection light to a surface of a shot region on a substrate; a receiving optical system configured to receive the detection light reflected at the shot region; a detector including a photodetector that accumulates charges generated by the detection light incident thereon and configured to detect a position of the detection light incident on the photodetector from the receiving optical system; and a controller configured to obtain a position of the surface based on the detection by the detector, wherein the controller is configured, during a time between an end of a detection of a first shot region by the detector and a start of a detection of a second shot region by the detector, the first shot region and the second shot region being successively measured by the detector, to cause the projecting optical system to project the detection light, to cause the receiving optical system to cause the projected detection light to be incident on the detector, and to cause the photodetector to discharge the charges generated by light incident from the receiving optical system.