Optical position-measuring device

An optical position-measuring device for determining a relative position of two objects that are movable relative to one another along at least a first and a second measurement direction, the optical position-measuring device comprising:

• a plurality of scanning units which are connected to a first one of the two objects and each include at least one light source, one or more gratings, and a detector assembly;
• and
• a scale which is connected to a second one of the two objects, the scale comprising:
• a two-dimensional measuring graduation composed of structure elements which are periodically arranged along the first and second measurement directions and have different optical properties, and
• a plurality of reference marks which are integrated into the measuring graduation and have periodic and aperiodic sub-regions, wherein scanning of a respective one of the reference marks allows a respective reference signal to be generated at a defined reference position along one of the measurement directions, and wherein at least the periodic sub-regions of the reference marks have a higher scanning efficiency than a surrounding part of the measuring graduation.