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:
Sep. 19, 2017
Filed:
May. 02, 2016
Tatsuya Ohsugi, Kanagawa, JP;
Kenji Sugiura, Kanagawa, JP;
Hirokazu Ishii, Tokyo, JP;
Hiroyoshi Haga, Kanagawa, JP;
Yuuji Wada, Kanagawa, JP;
Takehide Mizutani, Tokyo, JP;
Naoto Kochi, Kanagawa, JP;
Naohiro Kumagai, Kanagawa, JP;
Seiichi Kogure, Kanagawa, JP;
Junpei Fujita, Kanagawa, JP;
Kazuki Yogosawa, Kanagawa, JP;
Tatsuya Ohsugi, Kanagawa, JP;
Kenji Sugiura, Kanagawa, JP;
Hirokazu Ishii, Tokyo, JP;
Hiroyoshi Haga, Kanagawa, JP;
Yuuji Wada, Kanagawa, JP;
Takehide Mizutani, Tokyo, JP;
Naoto Kochi, Kanagawa, JP;
Naohiro Kumagai, Kanagawa, JP;
Seiichi Kogure, Kanagawa, JP;
Junpei Fujita, Kanagawa, JP;
Kazuki Yogosawa, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus, including an image bearer configured to bear a toner image; a transfer device disposed opposing to the image bearer; and a transfer bias power source. The transfer bias power source is configured to output a transfer bias to transfer the toner image onto a recording medium. The transfer bias is a superimposed bias that cyclically alternates between a transfer-directional bias to transfer the toner image from the image bearer onto the recording medium and an opposite-directional bias in an opposite direction of the transfer direction. A ratio of a time period of application of the opposite-directional bias to a total time period of one cycle of the output transfer bias is greater than 50%. The transfer bias power source changes a value of a direct current voltage in the superimposed bias according to a linear velocity of the image bearer.