Patent ID: 7196319
Filing Date: 2007-03-27
Classification: G01D

Abstract:
1. A position-measuring device for generating measuring signals, comprising: a track including an incremental graduation having a specified graduation period and extending along a measuring direction, at least one discontinuity of the incremental graduation arranged at a reference position to generate a reference signal; a scanning unit configured to scan the incremental graduation by radiation beams, one of (a) the track and (b) the scanning unit movable relative to the other one of (a) the track and (b) the scanning unit along the measuring direction; and at least one imaging optics system; wherein the at least one discontinuity is formed by a modification of the incremental graduation, extending perpendicular to the measuring direction, of the incremental graduation arranged to deflect radiation beams that originate from the scanning unit, a deflection direction deviating at the discontinuity from a deflection direction in other regions of the incremental graduation; wherein the scanning unit includes at least one reference-pulse detector element configured to receive one of the radiation beams having different deflection directions; and wherein the at least one imaging optics system is arranged in a beam path of a respective deflected radiation beam, the at least one imaging optics system configured to image a slit from the incremental graduation onto a further slit located in a defined image plane.