Patent ID: 8027021

Claim:
A measuring apparatus that measures position information of a movable body that moves within a predetermined plane, the apparatus comprising: an encoder system that includes a plurality of scale members arranged on the movable body and each having a grating formed thereon and a plurality of heads that each irradiate a light to each of the plurality of scale members and individually receive a reflected light from each of the gratings, and measures position information of the movable body within the plane; and a surface position measuring system that includes a plurality of surface position sensors that, by each irradiating a light to the plurality of scale members from a direction orthogonal to the plane and receiving the reflected light, measure position information of the scale members in the direction orthogonal to the plane at an irradiation point of the light, and measures position information of the movable body in the direction orthogonal to the plane and in a tilt direction with respect to the plane.