Abstract: In an optical position measuring device for determining the position of two objects movable relative to each other along a measuring direction, a measuring standard includes a reflective measuring scale extending along the measuring direction and having scale regions with different reflectivities. A scanning unit arranged at a scanning distance relative to the measuring standard. Light source(s) and a detector arrangement including optoelectronic detector elements arranged periodically along the measuring direction are also provided. A signal processing unit is adapted to generate position signals relating to the relative position of the objects from the photocurrents generated by the detector elements, to determine a total photocurrent in a middle region and edge region(s) of the detector, and to determine the scanning distance from the photocurrent ratio of the total photocurrents formed in the middle region and edge region(s) of the detector.

Abstract: A position-measuring device includes a code carrier having a first graduation track and a second graduation track, the second graduation track being an incremental graduation track. A first detector system is configured to scan the graduation tracks so as to generate first position signals. A second detector system is configured to scan the second graduation track so as to generate second position signals. A first position-processing unit is configured to process the first position signals so as to yield a first absolute position value. A second position-processing unit is configured to process the second position signals so as to yield a second absolute position value. The first position-processing unit is configured to feed an absolute auxiliary position value to the second position-processing unit. The second position-processing unit is initializable with the absolute auxiliary position value.

Abstract: A position-measuring device includes a code carrier having a first graduation track and a second graduation track, the second graduation track being an incremental graduation track. A first detector system is configured to scan the graduation tracks so as to generate first position signals. A second detector system is configured to scan the second graduation track so as to generate second position signals. A first position-processing unit is configured to process the first position signals so as to yield a first absolute position value. A second position-processing unit is configured to process the second position signals so as to yield a second absolute position value. The first position-processing unit is configured to feed an absolute auxiliary position value to the second position-processing unit. The second position-processing unit is initializable with the absolute auxiliary position value.