Patent ID: 7348546

Claim:
A position measuring system for generating position-dependent scanning signals, comprising: a scale comprising: an incremental graduation track, which extends in a measuring direction, said incremental graduation track comprises: a periodic arrangement of graduation areas with different optical properties; and a reference marking in a reference position, wherein said reference marking is integrated into said incremental graduation track and comprises an aperiodic arrangement of graduation areas; a scanning unit, wherein said scale and said scanning unit move in relation to each other in said measuring direction, said scanning unit comprising: a light source without an optical collimator arrangement placed in front of said light source; and an opto-electronic detector arrangement comprising a reference pulse signal detection unit, wherein said reference pulse signal detection unit is matched to said reference marking for generating a reference pulse signal, and wherein a periodic strip pattern results in a detection plane, wherein said periodic strip pattern is amplitude-modulated in an area of said reference position, wherein said reference pulse signal detection unit comprises several reference pulse signal detection elements, wherein said several reference pulse signal detection elements are dimensioned in such a way and interconnected for creating said reference pulse signal, and said several reference pulse signal detection elements act as bandpass filters on said strip pattern at said reference position, and that said reference pulse signal is present on an output side of said opto-electronic arrangement from which a periodic signal portion, as well as low-frequency signal portions are filtered out of said incremental graduation track to a large degree.