Patent ID: 8902402
Filing Date: 2014-12-02
Classification: G01B,G03F,Y10T

Abstract:
1. A movable body apparatus, comprising: a movable body which is movable at least along a two-dimensional plane including a first axis and a second axis that are orthogonal to each other; a first support member which supports the movable body at least when the movable body moves within a predetermined range within the two-dimensional plane; a second support member which supports the movable body outside the predetermined range within the two-dimensional plane; a first measurement system which measures positional information of the movable body in a direction parallel to the first axis and a direction parallel to the second axis when the movable body moves within the predetermined range within the two-dimensional plane, by irradiating at least one first measurement beam from below on a first measurement plane substantially parallel to the two-dimensional plane placed on the movable body and receiving a light from the first measurement plane of the at least one first measurement beam; a second measurement system which measures positional information of the movable body at least in a direction parallel to the first axis outside the predetermined range within the two-dimensional plane; and a control system which controls a position of the movable body, based on measurement information of at least one of the first measurement system and the second measurement system, wherein the second measurement system measures the positional information when the movable body is moved from the first support member to the second support member, or from the second support member to the first support member.