Patent ID: 9229333
Filing Date: 2016-01-05
CPC Classification: G03F,Y10T

Claim Text:
1. A movable body drive system which drives a movable body substantially along a predetermined plane, the system comprising: an encoder system which has a head irradiating a detection beam on a scale having a two-dimensional grating whose periodic directions are a first direction and a second direction orthogonal to each other within a plane parallel to the predetermined plane and receiving light from the scale, and measures positional information of the movable body at least in directions of two degrees of freedom within the predetermined plane including the first and the second directions based on measurement values of the head; and a drive device which drives the movable body along the predetermined plane based on measurement information of the encoder system, wherein the drive device drives the movable body so that a measurement error of the encoder system that occurs due to at least one of the head and the scale is compensated for.