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:
Apr. 13, 2010
Filed:
Sep. 18, 2008
Michael Vogel, Schleifreisen, DE;
Andreas Glimm, Weimar, DE;
Michael Vogel, Schleifreisen, DE;
Andreas Glimm, Weimar, DE;
Trimble Navigation Limited, Sunnyvale, CA (US);
Abstract
An angle measurement device includes a light source configured to emit light along an optical path and a patterned member positioned along the optical path and configured to rotate about an axis of rotation. The patterned member includes a periodic optical variation. Light passing through the patterned member provides a spatially modulated optical waveform. The angle measurement device also includes an imaging device positioned along the optical path and including a plurality of photosensitive elements disposed in an array configuration. The imaging device is configured to receive the spatially modulated optical waveform and provide a signal associated with light intensity at each of the plurality of photosensitive elements. The angle measurement device further includes an angle determination unit coupled to the imaging device and configured to compute a rotation angle of the patterned member based on a reference waveform and the provided signal.