Patent ID: 8218129

Claim:
A movable body drive method in which a movable body is driven substantially along a two-dimensional plane, the method comprising: a drive process in which the movable body is moved along a predetermined direction parallel to the two-dimensional plane, and during the movement of the movable body, positional information of the movable body in a direction orthogonal to the two-dimensional plane is measured using a plurality of sensor heads of a position measurement system, and based on the measured positional information of the movable body and positional information within a plane parallel to the two-dimensional plane of at least one sensor head used in measurement of the information, the movable body is driven in at least a tilt direction with respect to the two-dimensional plane; and a measuring process in which, prior to the drive process, the movable body is moved parallel to the two-dimensional plane, and during the movement, measurement information of the at least one sensor head is acquired, and thereby positional information of the sensor head within the plane corresponding to the measurement information is measured.