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. 04, 2011
Filed:
Apr. 12, 2007
Kengo Matsuyama, Chiba, JP;
Yoshikazu Harada, Nara, JP;
Norio Tomita, Nara, JP;
Yoshiteru Kikuchi, Yamatokoriyama, JP;
Hirokazu Fujita, Nara, JP;
Kengo Matsuyama, Chiba, JP;
Yoshikazu Harada, Nara, JP;
Norio Tomita, Nara, JP;
Yoshiteru Kikuchi, Yamatokoriyama, JP;
Hirokazu Fujita, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A color registration method in a color image forming apparatus including a plurality of drum-type photoconductors for driving some or all of the photoconductors having the same diameter to match pitch fluctuations which correspond to a rotational cycle of the photoconductors, the method including: a first measurement step for forming a first registration image for each color and measuring formation positions of a plurality of predetermined portions in each registration image; a second measurement step for forming a second registration image for each color and measuring formation positions of a plurality of predetermined portions in each registration image; a calculation step for calculating a periodic fluctuation component being contained in the images in different colors and corresponding to the rotational cycle of the photoconductors so as to obtain phases thereof; and a step for adjusting a rotational phase of the photoconductors in order for the obtained phases matching to each other, wherein the interval between first and second registration images in the rotating direction is set such that disturbance components in which a cycle is assumed beforehand, cancel with each other by calculating the deviation.