Patent ID: 7858922

Claim:
A position-measuring device for generating incremental signals and a reference-pulse signal at at least one reference position, comprising: a scanning unit; and a measuring graduation displaceable relative to the scanning unit in at least one measuring direction; wherein the measuring graduation includes two incremental-graduation tracks having periodic incremental graduations and extending in parallel in the measuring direction, a reference-marking track arranged between the incremental-graduation tracks and including a reference marking at at least one reference position; wherein the scanning unit includes a first scanning device configured to generate the reference-pulse signal and a second scanning device configured to generate the incremental signals; wherein each incremental graduation is arranged to be acted upon at least once in an incremental-signal scanning field by a scanning-beam to generate the incremental signals; and wherein the reference marking includes a plurality of structure elements arranged in mirror symmetry with respect to an axis of symmetry oriented perpendicular to the measuring direction in a measuring-graduation plane.