Patent ID: 8705049
Filing Date: 2014-04-22
Classification: G01B

Abstract:
1. A three-dimensional shape measuring apparatus that measures a three-dimensional shape of a measurement target by analyzing an optical pattern projected to the measurement target, luminance of the optical pattern periodically changing according to a position, the three-dimensional shape measuring apparatus comprising: a mounting stage to which the measurement target is attached, the mounting stage having a reference plane that becomes a reference of a height of the measurement target; a measurement head that projects the optical pattern to the measurement target and the reference plane and captures images of the projected optical patterns; a displacement portion that displaces at least one of the mounting stage and the measurement head in a height direction of the measurement target; phase computing means for computing a phase of the optical pattern in a certain pixel included in the image captured by the measurement head; height computing means for computing a height of the measurement target based on the phase computed by the phase computing means; and displacement portion control means for controlling the displacement portion based on the height of the measurement target computed by the height computing means, wherein the height computing means computes the height based on the phase computed by the phase computing means, and corrects the computed height based on a displacement amount displaced by the displacement portion from the reference plane of the mounting stage to the height of the measurement head, thereby computing the height of the measurement target.