Patent ID: 6141106
Filing Date: 2000-10-31
Classification: G01B

Abstract:
A measuring instrument to scan dimensions, and particularly diameters of objects to be measured, comprisinga guide means which defines a center plane of the measuring instrument,a retaining fixture having means to hold an object to be measured in the center plane in such position that a dimension of interest will extend parallel to the guide means,a carriage supporting a transmitter at one side of the center plane and a receiver at the other side for an energy beam which passes transversely of the center plane and of the dimension of interest,a distance measuring means to measure movements of the carriage along the guide means, andan evaluating means to determine the dimension of interest based on positions of the carriage at which the energy beam, first received by the receiver, is interrupted by the object to be measured and then again received,characterized in that the energy beam is focused on the center plane, andthe distance measuring means carries a rule member which is disposed in the center plane.