Patents Assigned to Dr. Johannes Heiden Lain GmbH
  • Patent number: 6747262
    Abstract: A position measuring system for determining the relative position of a first object and a second object movable relative to one another that includes an incremental track, associated with a first object and having a periodic line structure that has individual lines and a scanning unit, associated with a second object movable relative to the first object, that scans said periodic line structure and that generates a corresponding incremental signal. A sensor system that generates absolute position information pertaining to the relative position of the first and second objects, wherein the width of the individual lines, as measured along a longitudinal direction of the incremental track, varies over at least a portion of the breadth of the incremental track, as measured in a direction transverse to the longitudinal direction, in such a way that a structure with absolute position information is superimposed on the periodic line structure.
    Type: Grant
    Filed: November 7, 2002
    Date of Patent: June 8, 2004
    Assignee: Dr. Johannes Heiden Lain GmbH
    Inventor: Joerg Willhelm