Patent ID: 8243264

Claim:
A measuring apparatus comprising: a projection optical system configured to radiate a line beam extending in one direction on a measurement target; an imaging device configured to acquire a reflected line beam reflected from the measurement target, the measuring apparatus measuring a surface shape of the measurement target on the basis of a geometric positional relationship in the reflected line beam on the measurement target, the reflected line beam being acquired by the imaging device; an optical imaging system provided between the measurement target and the imaging device, and configured to cause the reflected line beam to form an image on a receiving surface of the imaging device so that a shape of the line beam on the measurement target is acquired; and a beam splitting mechanism configured to split the reflected line beam and guide the split reflected line beam to the imaging device, wherein the beam splitting mechanism splits the reflected line beam so that the shape of the line beam on the measurement target is acquired at different measurement positions in the extending direction of the line beam; a plurality of segments are set on the receiving surface of the imaging device while each of the segments is partitioned into a plurality of regions, and at least one region in each of the segments is set as a reception region; and the optical imaging system causes the reflected line beams split by the beam splitting mechanism to form images on the reception regions in the different segments, respectively, on the receiving surface of the imaging device.