Patent ID: 7573581
Filing Date: 2009-08-11
Classification: G01B,G01D

Abstract:
1. A position-measuring device for measuring a position of two objects movable relative to one another, comprising: a measuring graduation connected to one of the two objects; and at least one scanning system adapted to scan the measuring graduation and connected to the other of the two objects, the scanning system adapted to form a first scanning beam path and a second scanning beam path, the scanning system adapted to generate a group of phase-shifted signals from two interfering partial beams of rays in each of the scanning beam paths, the scanning system adapted to permit a simultaneous determination of position values along at least one lateral shift direction of the objects and along a vertical shift direction of the objects from the groups of phase-shifted signals, the two partial beams of rays of each scanning beam path arranged asymmetrically with respect to a plane perpendicular to the lateral shift direction.