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. 28, 2015
Filed:
Aug. 27, 2012
Tadashi Fukumuro, Mishima, JP;
Tadashi Fukumuro, Mishima, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Patch background data at each position of a background where a toner patch is formed in the second rotation is estimated from background measurement data at a plurality of positions detected in the first rotation and patch neighborhood measurement data detected in the second rotation at a plurality of positions where no toner patch is formed. Since the apparatus can execute density measurement before the light emission amount of a density sensor stabilizes, the time required for density measurement can be shorter than before. Since the change ratio of the light emission amount and the variation of the reflected light amount from the background are reflected on the patch background data, the density measurement accuracy can be improved.