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:
Dec. 25, 2012
Filed:
Mar. 24, 2009
Richard Izak, Bad Aibling, DE;
Johann Oberhauser, Vachendorf, DE;
Robert Noichl, Rott, DE;
Dr. Johannes Heidenhain GmbH, Traunreut, DE;
Abstract
A position-measuring device includes a measuring standard, on which at least one graduation track is applied, and a support member. Disposed on the support member is at least one exciter winding through which an excitation current is able to be conducted in order to generate an electromagnetic field, as well as at least one detector system for scanning the electromagnetic field, The position-measuring device further includes a capacitor which, together with the exciter winding, forms an LC oscillating circuit, an evaluation element and a switching element that is switchable by the evaluation element. The measuring standard and the support member are disposed in a manner allowing movement relative to each other, and in response to a movement of the measuring standard relative to the support member, the electromagnetic field is able to be influenced by the at least one graduation track. The LC oscillating circuit is operable by switching the switching element with an excitation current which induces in the detector system at least one voltage that is able to be processed electronically by the evaluation element to ascertain position information. The excitation current is generated by switching the switching element with switch-on pulses that have an ON time period, and the at least one voltage induced in the detector system is measured in the area after the cut-off edge of the switch-on pulse for ascertaining the position information.