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. 09, 2017
Filed:
Apr. 29, 2016
Naoto Kochi, Kanagawa, JP;
Kenji Sugiura, Kanagawa, JP;
Hirokazu Ishii, Tokyo, JP;
Hiroyoshi Haga, Kanagawa, JP;
Yuuji Wada, Kanagawa, JP;
Takehide Mizutani, Tokyo, JP;
Naohiro Kumagai, Kanagawa, JP;
Junpei Fujita, Kanagawa, JP;
Tatsuya Ohsugi, Kanagawa, JP;
Kazuki Yogosawa, Kanagawa, JP;
Naoto Kochi, Kanagawa, JP;
Kenji Sugiura, Kanagawa, JP;
Hirokazu Ishii, Tokyo, JP;
Hiroyoshi Haga, Kanagawa, JP;
Yuuji Wada, Kanagawa, JP;
Takehide Mizutani, Tokyo, JP;
Naohiro Kumagai, Kanagawa, JP;
Junpei Fujita, Kanagawa, JP;
Tatsuya Ohsugi, Kanagawa, JP;
Kazuki Yogosawa, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes an image bearer, a transfer device contacting the image bearer to form a transfer portion, a transfer bias power source, and a controller. A ratio of a time period of application of the opposite-directional bias to a total time period of one cycle of the AC component of the superimposed bias is greater than 50%. A ratio of a value of the DC component of the superimposed bias output within a region ranging from a leading end of the recording medium to a predetermined length to a value of the DC component of the superimposed bias output outside the region is greater than a ratio of a value of the AC component of the superimposed bias output within the region to a value of the AC component of the superimposed bias output outside the region.