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:
May. 21, 2019
Filed:
Apr. 10, 2017
Keigo Nakamura, Kanagawa, JP;
Hirokazu Ishii, Tokyo, JP;
Kenji Sugiura, Kanagawa, JP;
Takehide Mizutani, Tokyo, JP;
Atsushi Nagata, Kanagawa, JP;
Naoto Kochi, Tokyo, JP;
Yuuji Wada, Kanagawa, JP;
Shinya Tanaka, Kanagawa, JP;
Keigo Nakamura, Kanagawa, JP;
Hirokazu Ishii, Tokyo, JP;
Kenji Sugiura, Kanagawa, JP;
Takehide Mizutani, Tokyo, JP;
Atsushi Nagata, Kanagawa, JP;
Naoto Kochi, Tokyo, JP;
Yuuji Wada, Kanagawa, JP;
Shinya Tanaka, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus including an image bearer, a transfer-bias power source, an environment sensor, and a controller. The controller controls the transfer-bias power source to change the DC component and the AC component, according to the at least one of temperature and humidity detected by the environment sensor and a duty of the transfer bias. The duty is A/(A+B)×100[%] where A denotes an area on a return-directional side to move toner from the recording sheet back to the image bearer, relative to a center value (Voff) of a maximum value and a minimum value of the transfer bias in one cycle of a waveform of the transfer bias, and B denotes an area on a transfer-directional side to move the toner from the image bearer to the recording sheet, relative to the center value (Voff) in the one cycle.