Brinks Hofer Gilson & Lione
Apparatus and method for generating position-dependent signals using a scanning plate having a plurality of differently configured scanning regions
 In this apparatus, which serves preferably to generate reference pulses, graduations are provided on the scanner plate (A), whose graduation period varies steadily as a function of location (chirped grating). The various graduation markings (GS) are embodied in turn as periodic phase gratings, whose graduation scores extend parallel to the measurement direction (X). 
Johannes Heidenhain GmbH
G G
G01D G02B
inventional inventional
Walter Wolfgang
Huber Holzapfel