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:
Sep. 15, 2020
Filed:
Feb. 15, 2019
Dr. Johannes Heidenhain Gmbh, Traunreut, DE;
Michael Hermann, Tacherting, DE;
DR. JOHANNES HEIDENHAIN GMBH, Traunreut, DE;
Abstract
An optical position-measuring device for determining the relative position of two objects includes two scanning units which are connected to one of the objects and each include a light source, one or more gratings and a detector assembly. A scale is connected to the other object and has two tracks each containing incremental graduations extending along a first one of the measurement directions. The incremental graduations each are composed of graduation regions which have different optical properties and are periodically arranged along an incremental graduation direction. The two incremental graduation directions form an angle of between 0° and 90° relative to each other. Each of the two incremental graduations has a reference mark integrated therein such that scanning of the reference mark allows a reference signal to be generated at a defined reference position along each of the measurement directions. The reference marks include both aperiodic and periodic portions.