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. 12, 2015
Filed:
May. 22, 2012
Yasunobu Shimizu, Kanagawa, JP;
Hiroyoshi Haga, Kanagawa, JP;
Tomokazu Takeuchi, Tokyo, JP;
Hiromi Ogiyama, Tokyo, JP;
Kenji Sengoku, Kanagawa, JP;
Junpei Fujita, Kanagawa, JP;
Yasunobu Shimizu, Kanagawa, JP;
Hiroyoshi Haga, Kanagawa, JP;
Tomokazu Takeuchi, Tokyo, JP;
Hiromi Ogiyama, Tokyo, JP;
Kenji Sengoku, Kanagawa, JP;
Junpei Fujita, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus, includes an image bearer to bear a toner image; a transfer member to transfer the toner image; a transfer bias applicator to apply a transfer bias to the transfer member, the transfer bias applicator including a direct current voltage source to apply a direct current transfer bias constituted by a direct current voltage to the transfer member; and a superimposed voltage source to apply a superimposed transfer bias in which an alternating current voltage is superimposed on a direct current voltage to the transfer member; and a controller to switch between a direct current transfer mode during which the direct current transfer bias is applied to transfer the toner image and a superimposed transfer mode during which the superimposed transfer bias is applied to transfer the toner image while the direct current voltage source and the superimposed voltage source are off.