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. 30, 2015
Filed:
Sep. 08, 2010
David Hopp, Donaueschingen, DE;
Christof Pruss, Ostfildern, DE;
Wolfgang Osten, Stuttgart, DE;
University of Stuttgart, Stuttgart, DE;
Abstract
The invention relates to an improved encoding disk for an optical rotation angle sensor or a rotary encoder, an optical rotation sensor or rotary encoder comprising an improved encoding disk, and a method for optically correcting or compensating for an angle measuring error of a rotary encoder, in particular an angle measuring error which is contingent on a displacement or decentralization of the encoding disk. The encoding disk () comprises at least one measuring track () and at least one compensating track (), wherein the measuring track () is in a first radial region of the encoding disk (); and the compensating track () is centered with regard to the measuring track () on a second radial region of the encoding disk () so that the center of the measuring track () coincides with the center of the compensating track (). The compensating track () is preferably designed such that at least one part of the light incident on a region of the compensating track is deflected by the compensating track () radially in the direction of the axis through the common center of the compensating track () and the measuring track (). The direction of the readout light which is deflected by the compensating track preferably intersects the axis through the common center of the compensating track and the measuring track, wherein the distance between the compensating track and said intersection corresponds to the length of the light path between the compensating track and the measuring track. The readout light can be coherent or incoherent. The radius of the compensating track can be less than, greater than, or equal to the radius of the measuring track. The compensating track () preferably has a diffractive structure.