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. 25, 2008
Filed:
Feb. 09, 2006
Jürgen Schoser, St. Georgen, DE;
Michael Hermann, Tacherting, DE;
Wolfgang Holzapfel, Obing, DE;
Dr. Johannes Heidenhain GmbH, Traunreut, DE;
Abstract
A position measuring system having a scale that includes an incremental graduation track, which extends in a measuring direction, the incremental graduation track having a periodic arrangement of graduation areas with different optical properties and a reference marking in a reference position, which has an aperiodic arrangement of graduation areas. A scanning unit including a light source and an opto-electronic detector arrangement having a reference pulse signal detection unit for generating a reference pulse signal. A periodic strip pattern results in a detection plane, which is amplitude-modulated in an area of the reference position, wherein the reference pulse signal detection unit includes several reference pulse signal detection elements, which create the reference pulse signal so that a periodic signal portion, as well as low-frequency signal portions are filtered out of the incremental graduation track to a large degree.