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:
Mar. 28, 2006
Filed:
Sep. 08, 2001
Wolfgang Holzapfel, Obing, DE;
Andreas Schreiber, Birstein, DE;
Wolfgang Holzapfel, Obing, DE;
Andreas Schreiber, Birstein, DE;
Dr. Johannes Heidenhain GmbH, Traunreut, DE;
Abstract
A position measuring device for detecting the relative position of a scanning unit and a scale. The position measuring device includes a scale and a scanning unit that is displaced with respect to the scale in a measuring direction. The scanning unit includes a scanning grating, a ridge prism and an optoelectronic detector element. The ridge prism having a ridge that is oriented parallel with the measuring direction, the ridge prism acts as a retro-reflector in a second direction which is aligned in a plane of the scale vertically with respect to the measuring direction.