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:
Feb. 03, 2015
Filed:
May. 16, 2012
Junpei Fujita, Kanagawa, JP;
Tomokazu Takeuchi, Tokyo, JP;
Hiroyoshi Haga, Kanagawa, JP;
Hiromi Ogiyama, Tokyo, JP;
Yasunobu Shimizu, Kanagawa, JP;
Kenji Sengoku, Kanagawa, JP;
Junpei Fujita, Kanagawa, JP;
Tomokazu Takeuchi, Tokyo, JP;
Hiroyoshi Haga, Kanagawa, JP;
Hiromi Ogiyama, Tokyo, JP;
Yasunobu Shimizu, Kanagawa, JP;
Kenji Sengoku, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes an image bearing member to bear a toner image on a surface thereof, a transfer unit including a transfer device to transfer the toner image onto a recording medium, disposed opposite the image bearing member, a direct current (DC) power source to apply, between the image bearing member and the transfer device, a DC bias to form a first transfer electric field to transfer the toner image onto the recording medium, and a power supply module detachably attachable relative to the image forming apparatus. The power supply module includes an AC-DC superimposed bias power source to apply, between the image bearing member and the transfer device, a superimposed bias in which an alternating voltage is superimposed on a DC voltage to form a second transfer electric field to transfer the toner image onto the recording medium.