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:
Jul. 28, 2015
Filed:
Feb. 05, 2014
Ryuji Yoshida, Kanagawa, JP;
Hideki Zemba, Kanagawa, JP;
Yusuke Mitani, Kanagawa, JP;
Shotaro Hoshi, Kanagawa, JP;
Masahiko Shakuto, Kanagawa, JP;
Hiroaki Maeda, Kanagawa, JP;
Ryuji Yoshida, Kanagawa, JP;
Hideki Zemba, Kanagawa, JP;
Yusuke Mitani, Kanagawa, JP;
Shotaro Hoshi, Kanagawa, JP;
Masahiko Shakuto, Kanagawa, JP;
Hiroaki Maeda, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes a charging bias output device, a developing bias output device, a transfer bias output device, and a controller. The controller controls the transfer bias output device to supply a transfer bias from a time at which a first position of a photosensitive member arrives at a transfer position after the charging bias output device starts supplying a charging bias. An initial value of the transfer bias is controlled to be smaller than a normal set value for a predetermined time period which is a time after the transfer bias starts to be supplied and within a time corresponding to a rise time during which a surface potential of the photosensitive member reaches a predetermined potential after the charging bias starts to be output. The first position of the photosensitive member is a position at which the charging device starts charging the photosensitive member.