An optoelectronic position measuring device includes an encoder disk having a
coding with a digital code and an analog coded track. The analog track includes
segments which are in a series and whose width changes. An illuminator images the
coding onto a sensor having transducers. The sensor determines the width of the
analog track at a given position of the disk relative to the sensor as a function
of the number of transducers upon which the analog track is optically imaged onto.
The analog track is part of a continuous reference code track which has central
symmetry in which the segments have a code length corresponding to the smallest
resolution step of the digital coding. The layout of the segments and the resolving
power of the sensor are matched such that movement of the disk along the code length
is resolvable into at least two defined steps.
