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:
Jan. 09, 2007
Filed:
Nov. 30, 2004
Robert E. Grace, Fairport, NY (US);
Michael C. Mongeon, Walworth, NY (US);
Hugh W. Griffith, Albans, GB;
Krzysztof J. Less, London, GB;
Tim D. M. Enskat, Oxford, GB;
Robert E. Grace, Fairport, NY (US);
Michael C. Mongeon, Walworth, NY (US);
Hugh W. Griffith, Albans, GB;
Krzysztof J. Less, London, GB;
Tim D. M. Enskat, Oxford, GB;
Xerox Corporation, Stamford, CT (US);
Abstract
Using a document scanner or other image input device of an image or document processing system to periodically scan or image printed test images from a plurality of marking engines replaces internal sensors as a feedback means in image quality control. For example, image lightness (L*) is controlled by periodically printing mid-tone test patches, scanning the printed test patches with a main job document scanner and analyzing the scanned image to determine updated marking engine actuator set points. For instance, ROS exposure and/or scorotron grid voltages are adjusted to maintain image lightness consistency between marking engines.