Patent ID: 8820623
Filing Date: 2014-09-02
Classification: G01D

Abstract:
1. A position-measuring device, comprising: a code including a series of code elements arranged one after another in a measuring direction, at least two successive code elements form a code word including a position information item; and a scanning device, including a detector unit having detector elements arranged to read the code elements of the code forming the code word, and an evaluation device adapted to ascertain the code word including current position information from scanning signals of the detector elements, the scanning device and the code movable relative to each other in the measuring direction; wherein a first subset of adjacent code elements of the code have identical properties in the transition region between the adjacent code elements and a second subset of adjacent code elements of the code have different properties in the transition region between the adjacent code elements; wherein the code includes separation elements arranged between adjacent code elements that have identical properties in at least adjacent transition regions of the adjacent code elements; wherein each separation element has uniform properties throughout, the properties of each separation element being inverse to the identical properties of the adjacent transition regions of the adjacent code elements between which the separation element is arranged; and wherein a scanning signal of a detector element that reads the code at a separation element has a temporary change in intensity in relation to a scanning signal of immediately adjacent detector elements to reliably detect transitions between adjacent code elements that have identical properties in the transition region between the adjacent code elements.