AUTOMATIC MEASURING METHOD OF PROFILE SHAPE

• Main Authors: KOJIMA YOSHIO, TAKAKUSAKI TSUNEHIKO, TAKAGI YUSUKE
• Format: Patent
• Language: English
• Published: 22.01.1991
• Subjects: MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

PURPOSE:To solve the problem of the interference between an optical sensor and a body and the problem of the fact that an optical path cannot be formed and to make it possible to measure a complicated shape including recess parts by restricting the light projecting angle of the optical sensor at the value within a restricting range based on regions, and performing measurement. CONSTITUTION:An optical range sensor 3 utilizing a triangulation method is driven by a three-dimensional driving mechanism through a double-freedom-angle changing mechanism. The distance to the surface of a body is measured at an attitude by which the measuring surface of the body 2 forms a constant angle (in the vicinity of the vertical angle) with the optical axis. Thus, the shape of the body 2 is recognized. When the constant angle is made to be kept between the optical axis of the optical range sensor 3 and the surface of the body 2 in a region I and a region II where irregularities are large, the light axis is obstructed with the protruding surface, and the light does not reach the recessed surface. Therefore, in these regions, the optical range sensor 3 is restricted between Asmin and Asmax within the angle range wherein the reaching of the optical axis to the recessed surface is assured. Thus the measurement is performed.