Patent ID: 8115906

Claim:
A movable body system including a movable body which moves along a predetermined plane, the system comprising: a movable body having a main section which moves along the predetermined plane and a table member which can finely move in at least a direction orthogonal to the predetermined plane and a tilt direction with respect to the predetermined plane on the main section; and a measurement device which has a plurality of encoder heads arranged on the table member, and measures positional information of the movable body within the predetermined plane, based on an output of at least one encoder head of the plurality of encoder heads which faces a grating section placed substantially parallel with the predetermined plane outside the movable body, wherein the measurement device has a transmitting and receiving equipment which performs transmitting and receiving of a measurement beam and/or a signal by wireless communication between each of the plurality of encoder heads and a component outside the encoder heads, the transmitting and receiving equipment has a plurality of optical fibers whose end sections are arranged at the main section each facing each of the plurality of encoder heads, and whose optical axes are substantially parallel to a direction orthogonal to the predetermined plane at the end section, and at least one of transmitting and receiving of the measurement beam and air transmission of a signal light is performed between each of the plurality of encoder heads and the end section of the optical fiber facing the encoder head.