Patent ID: 8405818

Claim:
A position detection apparatus comprising: a sensor in which a plurality of regions where light from a mark formed on a substrate held by a stage is detected are arrayed in a first direction; a first driving unit configured to drive the stage; a control unit configured to control said first driving unit; and a processing unit configured to process the signals from said sensor, wherein said first driving unit drives the stage so that the mark is moved in a second direction perpendicular to a height direction of the substrate and a region which the light from the mark enters among the plurality of the regions moves in the first direction, wherein said first driving unit drives the stage so that the mark is moved in the height direction of the substrate while the mark is being moved in the second direction, and wherein said processing unit determines a position of the substrate in the height direction based on a light intensity distribution in the first direction which is measured by the plurality of regions of the sensor while the mark is being moved in the height direction and in the second direction.