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:
Apr. 26, 2016
Filed:
May. 30, 2012
Kenji Sengoku, Kanagawa, JP;
Hiromi Ogiyama, Tokyo, JP;
Hiroyoshi Haga, Kanagawa, JP;
Tomokazu Takeuchi, Tokyo, JP;
Yasunobu Shimizu, Kanagawa, JP;
Junpei Fujita, Kanagawa, JP;
Kenji Sengoku, Kanagawa, JP;
Hiromi Ogiyama, Tokyo, JP;
Hiroyoshi Haga, Kanagawa, JP;
Tomokazu Takeuchi, Tokyo, JP;
Yasunobu Shimizu, Kanagawa, JP;
Junpei Fujita, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes a transfer device to transfer a toner image from an image bearing member onto a recording medium, disposed opposite the image bearing member, a transfer bias power source to apply, between the image bearing member and the transfer device, a superimposed transfer bias in which a direct current (DC) component and an alternative current (AC) component are superimposed to transfer the toner image borne on the image bearing member to the recording medium, and a controller to change the superimposed bias that the transfer bias power source applies. The controller changes the levels of the DC component and the AC component of the superimposed transfer bias in a color mode from that in a monochrome mode to secure a return electric field in the superimposed transfer bias by which the toner is returned from the recording medium to the image bearing member.