Position measuring device

摘要

#CMT# #/CMT# A scanning unit (10) includes a first scanning device which generates a reference-pulse signal, and a second scanning device which generates incremental signals. Each incremental graduation (33.2) of each of the two incremental-graduation tracks of a displaceable reflection-measuring graduation (30) is arranged to be acted upon at least once in an incremental-signal scanning field by a scanning beam to generate incremental signals. #CMT#USE : #/CMT# Position-measuring apparatus for generating incremental signals and reference-pulse signal at reference position. #CMT#ADVANTAGE : #/CMT# Minimizes influence of Moire tilting between measuring graduation and scanning unit, thus avoiding faulty measurements. Provides offset placement of scanning fields, thus suppressing signal crosstalk on incremental track and achieving compact design. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows the schematic view of paths of scanning-beam components of position-measuring apparatus to describe the generation of reference-pulse signals. 10 : Scanning unit 14 : Light source 16 : Collimation optics 30 : Reflection-measuring graduation 33.2 : Incremental graduation.