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:
Aug. 23, 2016
Filed:
May. 21, 2013
Applicant:
Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US);
Inventors:
Amit Agrawal, Somerville, MA (US);
Jay Thornton, Watertown, MA (US);
Assignee:
Mitsubishi Electric Research Laboratories, Inc., Cambridge, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
G01D 5/244 (2006.01); G01D 18/00 (2006.01); G01D 5/245 (2006.01); G01D 5/347 (2006.01);
U.S. Cl.
CPC ...
G01D 18/00 (2013.01); G01D 5/2455 (2013.01); G01D 5/24452 (2013.01); G01D 5/34792 (2013.01);
Abstract
A rotary encoder includes a single read-head and a circular scale. The encoder is self-calibrated by acquiring calibration samples with the read-head for rotational angles of the circular scale, and estimating spatial frequency and spatial distortion parameters of the encoder from the calibration samples.