Absolutely coded positioning measuring system, has decoder unit scanning coded ruler and decoding position code, which is represented on coded ruler at coded measuring rod, where coded ruler and coded rod are mounted at sliding carriage

摘要

The system has a moving unit movably supported in a linear guide (02) relative to a base body (01). A decoder unit (14) scans a coded ruler (11) and decodes a position code, which is represented on the coded ruler at a coded measuring rod, where the coded ruler and a coded rod (08) are mounted at a sliding carriage (06). Materials for the basebody, the coded rod, the coded ruler and the carriage are selected such that temperature-dependent resulting change of overall length is smaller than the temperature-dependent individual length changes of the components of the moving unit.