Brinks Hofer Gilson & Lione
Scanning unit for an optical position measuring system
 A scanning unit for an optical position measuring system is disclosed which, besides periodic incremental signals, also provides at least one reference pulse signal at a defined reference position of a scale and a scanning unit which is movable relative to it. For scanning a reference mark on the scale, the scanning unit comprises a scanning plate with at least one reference mark scanning field and/or at least one reference pulse detector element. A filtering effect results either from the design of the reference mark scanning field or by the design of one or several reference mark detector elements in such a way that the periodic incremental signal portion of the reference pulse signal next to the reference position can be eliminated to a great extent. 
Johannes Heidenhain GmbH
G G
G01D G01D
inventional inventional
Volker Walter Elmar Wolfgang
Hofer Huber Mayer Holzapfel