Optical position-measuring device

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

• two 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 and has two tracks each containing incremental graduations extending along a first one of the measurement directions, the incremental graduations each being composed of graduation regions which have different optical properties and are periodically arranged along an incremental graduation direction, the two incremental graduation directions forming an angle of between 0° and 90° relative to each other, and each of the two incremental graduations having at least one reference mark integrated therein such that scanning of the reference mark allows a reference signal to be generated at a defined reference position along each of the measurement directions, the reference marks including both aperiodic and periodic portions.