Patent ID: 8553204
Filing Date: 2013-10-08
Classification: G03F

Abstract:
1. A movable body apparatus, comprising: a movable body which is movable substantially along a predetermined plane holding an object, and has a grating placed on a rear surface side of the object substantially parallel with the predetermined plane; a measurement system which irradiates a measurement light of a predetermined wavelength toward the grating on an opposite side of a mounting surface of the object, receives diffraction light from the grating originating from the measurement light, and measures positional information of the movable body in a measurement direction within the predetermined plane; and a drive system which drives the movable body, based on the positional information in the measurement direction of the movable body and correction information of a measurement error caused by a tilt of the movable body included in the positional information, wherein the movable body has a space inside, and the measurement system has a measurement member which is located in the space when the movable body is in an area within a predetermined range including a predetermined point where the movable body is to be positioned in the predetermined plane, and on the measurement member, at least a part of a head is provided which irradiates the measurement light on the grating and receives a diffraction light from the grating originating from the measurement light.