rotary position measuring

There is provided a rotational position measuring device according to the interferential action principle, comprising a housing, a rigidly connected to the housing scanning unit comprising a light source and at least one detector element, a surface arranged on the vibration-insensitive housing reflection scanning graduation structure disposed opposite to the scanning unit and a graduated disc, which is connected to a rotatable shaft and having a radial Tansmissions-Mesteilungsstruktur, wherein the indexing wheel is arranged to rotate about its axis of symmetry in the housing, so that the Mesteilungsstruktur between the scanning unit and the scanning graduation structure is located. Here, first the light emitted by the light source beams reach the Mesteilungsstruktur where splitting is done in diffracted partial beams of different orders. The diffracted partial beams of rays then tretten on the scanning graduation structure, where under reflection occurs a re-diffraction into different diffraction orders and a back-reflection of the diffracted partial beams in the direction of Mesteilungsstruktur results where the diffracted partial beams interfere and are detected via the at least one detector element (Figure 1).