The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 2006
Filed:
Jul. 05, 2002
Alexander Gruber, St. Georgen, DE;
Michael Hermann, Tacherting, DE;
Wolfgang Holzapfel, Obing, DE;
Markus Kühler, Nussdorf, DE;
Herbert Pronold, Traunreut, DE;
Sebastian Tondorf, Waging am See, DE;
Alexander Gruber, St. Georgen, DE;
Michael Hermann, Tacherting, DE;
Wolfgang Holzapfel, Obing, DE;
Markus Kühler, Nussdorf, DE;
Herbert Pronold, Traunreut, DE;
Sebastian Tondorf, Waging am See, DE;
Dr. Johannes Heidenhain GmbH, Traunreut, DE;
Abstract
A position measuring device having a scanning device and a scale, wherein the scanning device is movable in relation to the scale in a measuring direction. The scale including a measuring graduation, wherein periodic measuring signals are generated when the scanning device scans the measuring graduation and a reference marking, wherein a reference marking signal is generated when the scanning device scans the reference marking with a scanning beam bundle. The scale further includes a first optically scannable area marking next to the reference marking and a second optically scannable area marking next to the reference marking and which has a different optical deflection property than the first optically scannable area marking, wherein photoelectric scanning of the first and second optically scannable area markings with the scanning beam bundle from the scanning device generates an area signal that differentiates characteristics of the first and second optically scannable area markings. A first photo-receiver receives light from the first optically scannable area marking and a second photo-receiver receives light from the second optically scannable area marking.