Patents by Inventor Volker Hoefer

Volker Hoefer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6175414
    Abstract: An optical position measuring device is described for determining the relative position of two objects that are movable in a measuring direction with respect to each other. The position measuring device includes a scale having a scale reference mark structure, which is composed of n blocks arranged in the measuring direction with partial areas of varying optical characteristics. A scanning unit is also included, with a scanning reference pulse structure as well as a plurality of detector elements. Output signals are generated by the detector elements, which at a defined relative position of the two objects, have a maximum or a minimum value.
    Type: Grant
    Filed: November 18, 1999
    Date of Patent: January 16, 2001
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventors: Wolfgang Holzapfel, Volker Höfer, Walter Huber