Patent ID: 8508735
Filing Date: 2013-08-13
Classification: G03F,Y10T

Abstract:
1. A movable body apparatus, comprising: a movable body which is movable within a predetermined plane including a first axis and a second axis that are orthogonal to each other, with a measurement plane placed along a surface substantially parallel to the predetermined plane; a first measurement system which has an arm member having at least one end section facing the measurement plane from below and whose longitudinal direction is in a direction parallel to the first axis, the first measurement system irradiating at least one first measurement beam on the measurement plane from the arm member, receiving light from the measurement plane of the first measurement beam, and measuring a position of the movable body at least within the predetermined plane; and a second measurement system which measures a variance information of the aim member; and a drive system which drives the movable body based on an output of the first measurement system and the second measurement system.