Patent ID: 7684059

Claim:
A device for determining a position of an object that is movable along at least one displacement direction, comprising: a length measurement device assigned to each displacement direction and adapted to measure the position of the object along the respective displacement direction, the length measuring device including: a scale, as a first component, extending along the respective displacement direction; and a scanning head, as a second component, adapted to scan the scale to measure a change in position of the scale with respect to the scanning head along the respective displacement direction, one of the two components being moved together with the object; and a determination device adapted to determine a distance of the component of the respective length measuring device that is movable together with the object, from the object along the extension direction of the scale; wherein the determination device includes a measurement graduation as a first module and an associated measuring head as a second module, one of the two modules provided on the object and the other of the two modules provided on the component of the length measuring device that is movable together with the object.