Patent ID: 8854610

Claim:
An apparatus for measuring a measurement object comprising a three dimensional shape said apparatus comprising: a stage supporting a measurement object and transferring the measurement object in an X axis direction and a Y axis direction perpendicular to the X axis direction, the stage comprising a reference surface parallel to a plane defined by the X axis direction and the Y axis direction; a plurality of lighting units comprising more than two lighting units wherein each lighting unit in the plurality of lighting units includes a light source and a grid and radiates grid-patterned light to the measurement object; a grid transferring instrument moving the grid pitch by pitch, wherein the pitch is a pitch of patterns of the grid; a main image pickup portion oriented along a Z axis direction extending perpendicular to the reference surface; a plurality of sub image pickup portions comprising more than two sub image pickup portions, each disposed in an orientation between the Z axis direction and the plane defined by the X axis direction and the Y axis direction to define a constant angle between each sub image pickup portion and the reference surface; and a control unit calculating a three dimensional shape of the measurement object by using the grid images captured for each pitch-movement of the grid by the image pickup units; wherein the plurality of lighting units and the plurality of sub image pickup portions are alternately disposed around a circumference of a circle centered on the main image pickup unit.