Brinks Hofer Gilson & Lione
Position measuring system and method for operating a position measuring system
A position measuring system that includes a scale having a first track with successive partial areas of differing reflectivity and a second track with successive partial areas of differing reflectivity. A scanning unit which moves relative to the scale in a measuring direction so that a first position dependent scanning signal and a second position dependent scanning signal are generated by scanning the first track and the second track by the scanning unit. The first position dependent scanning signal and the second position dependent scanning signals have a different pitch behavior in case of a pitch tilt of either the scanning unit or the scale to the effect, that in that case the first position dependent scanning signal indicates an erroneous position, while the second position dependent scanning signal continues to show a correct position. The scanning unit has a structure such that a third position dependent scanning signal is generated from the first track and has a different pitch behavior than the first position measuring scanning signal generated from the first track.
Dr. Johannes Heidenhain GmbH
G
G01D
inventional
Ulrich Wolfgang
Benner Holzapfel