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. 15, 2009
Filed:
May. 04, 2005
Brian Anthony Reichert, Lexington, KY (US);
Steven Michael Turney, Lexington, KY (US);
Danny Keith Chapman, Sadieville, KY (US);
Thomas Austin Fields, Winchester, KY (US);
Brian Anthony Reichert, Lexington, KY (US);
Steven Michael Turney, Lexington, KY (US);
Danny Keith Chapman, Sadieville, KY (US);
Thomas Austin Fields, Winchester, KY (US);
Lexmark International, Inc., Lexington, KY (US);
Abstract
Correction of rotary encoder eccentricity in an image forming device having a motor controller using period and position pulse train feedback signals. A motor includes an encoder disc rotating with the motor and at least two encoder sensors disposed at different circumferential positions about the encoder disc. A controller may use a high speed clock to calculate a corrected speed count based on speed counts determined from the number of clock cycles that elapse per cycle of pulse trains from the encoders. The controller may also calculate a corrected position count based at least partly on one or more position counts determined from the number of clock cycles that elapse between periodic sampling points and transitions of encoder pulse trains. The corrected position count may also be calculated based on a position count and one or more speed counts.