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. 30, 2024
Filed:
Nov. 29, 2022
Masashi Kasamai, Kanagawa, JP;
Koji Kiryu, Tokyo, JP;
Masahiro Ashikawa, Kanagawa, JP;
Jumpei Yamaguchi, Kanagawa, JP;
Kanji Ubukata, Kanagawa, JP;
Nagisa Nakamura, Shizuoka, JP;
Masashi Kasamai, Kanagawa, JP;
Koji Kiryu, Tokyo, JP;
Masahiro Ashikawa, Kanagawa, JP;
Jumpei Yamaguchi, Kanagawa, JP;
Kanji Ubukata, Kanagawa, JP;
Nagisa Nakamura, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes image bearers, motors, a reference position detector, and processing circuitry. The circuitry senses a density of a toner image on each bearer; forms an image pattern and senses, based on a detection result of the detector and a sensing result of the density, density unevenness in a rotation cycle and a phase of the density unevenness with respect to a rotational position reference of each bearer; calculates a target phase based on the phase sensed; calculates a relative phase difference based on a rotational position and the target phase of each bearer; selects, as a reference image bearer, an image bearer having a minimum phase correction value, based on a calculation result of the difference; and controls the rotational position of each of the other image bearers with respect to the reference image bearer to the phase correction value, with the motors being driven.