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. 22, 2019
Filed:
Feb. 14, 2017
Ricoh Company, Ltd., Tokyo, JP;
Naoto Kochi, Tokyo, JP;
Hirokazu Ishii, Tokyo, JP;
Seiichi Kogure, Kanagawa, JP;
Naohiro Kumagai, Kanagawa, JP;
Kenji Sugiura, Kanagawa, JP;
Shinya Tanaka, Kanagawa, JP;
Hiroki Nakamatsu, Kanagawa, JP;
Yuuji Wada, Kanagawa, JP;
Junpei Fujita, Kanagawa, JP;
Takahiro Suzuki, Tokyo, JP;
Kazuki Yogosawa, Kanagawa, JP;
Atsushi Nagata, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes an image bearer to bear a toner image, a nip forming member contacting the image bearer to form a transfer nip, and a transfer power source. The transfer bias has a transfer peak value to electrostatically move toner from the image bearer to the recording sheet and an opposite-peak value to electrostatically move less toner from the image bearer to the recording sheet than the transfer peak value. An opposite-peak duty of the transfer bias is less than 50%. The opposite-peak duty is tr/T×100% where T is one cycle of the transfer bias and tr is a time period during which the transfer bias is on a side of the opposite-peak value relative to an offset voltage of the transfer bias in the one cycle T.