Brinks Hofer Gilson & Lione
Photoelectric position measuring system using gratings having specified dimensions to suppress harmonics
 A light source which emits light in strips is provided for illuminating a scale of a photoelectric position measuring system. The light modulated by the scale is converted into a sinusoidal scanning signal by a scanning plate. The scanning plate is a semiconductor substrate structured in strips. The width (A) of the light-emitting areas and the width (B) of the interspersed non-emitting areas of the light source is such that defined harmonics are filtered out of the scanning signal. The scanning plate is of such configuration that further harmonics are suppressed. 
Dr. Johannes Heidenhain GmbH
H H G H
H01L H01L G01D H01L
inventional inventional inventional inventional
Wolfgang Andreas
Holzapfel Franz