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. 05, 2005
Filed:
Dec. 09, 2002
Hirotaka Ishii, Shizuoka, JP;
Kenji Watanabe, Shizuoka, JP;
Hirotaka Ishii, Shizuoka, JP;
Kenji Watanabe, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A color image forming apparatus and a image quality control system capable of detecting uneven angular speed of a photoreceptor drum easily and reducing color drift significantly simply by adjusting rotational phase of each image carrier is provided. A color image forming apparatus includes a plurality of transfer units for transferring formed image on the recording material S to be placed and carried on the carrying unit, a pattern forming unit for forming a displacement detection pattern on the carrying unit, a displacement detecting unit for detecting a displacement detection pattern formed on the carrying unit, and a phase adjusting unit for adjusting the rotational phase of the photosensitive drum, and is characterized in that the displacement detecting unit includes a computing unit for arranging the detection pattern of reference color and detecting colors that are detected by one of the detecting units and by other detecting unit respectively, and calculating the amount of displacement of the detecting color with respect to the reference color based on the result detected from the displacement detection pattern.