Patent ID: 6703634
Filing Date: 2004-03-09
Classification: G01B

Abstract:
A 3D-shape measurement apparatus which detects a reflected light obtained by irradiating an object as a target of measurement with a scanning light beam by employing an optical position detector, and measures the 3D-shape of the object from the result of detection at each scanning position, said apparatus comprising:means for generating a light beam; polarization scanning means for polarizing the light beam to make the light beam perform scanning; scanning convergence means for converging the light beam which has passed through the polarization scanning means; and reflected light path changing means for guiding the reflected light from the target object located on a locus (hereinafter referred to as a scanning line) which is drawn by a focal point of the light beam (hereinafter referred to as a scanning light beam) which has passed through the scanning convergence means, toward the scanning convergence means and the polarization scanning means, to make the reflected light incident on the optical position detector, and changing, when the object moves in a direction perpendicular to both of the scanning light beam and the scanning line (hereinafter referred to as a sub scanning direction), the optical path of the reflected light so that the direction of a movement of the image obtained by the optical position detector in the sub scanning direction becomes the same as the direction of the movement of the object, and the moving distance of the image becomes less than twice as long as the moving distance of the object.