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:
Jun. 22, 2010
Filed:
Mar. 18, 2008
Shoichi Sakata, Osaka, JP;
Takahisa Nakaue, Osaka, JP;
Toyotsune Inoue, Osaka, JP;
Akihiro Watanabe, Osaka, JP;
Masashi Fujishima, Osaka, JP;
Yukihiro Mori, Osaka, JP;
Shoichi Sakata, Osaka, JP;
Takahisa Nakaue, Osaka, JP;
Toyotsune Inoue, Osaka, JP;
Akihiro Watanabe, Osaka, JP;
Masashi Fujishima, Osaka, JP;
Yukihiro Mori, Osaka, JP;
Kyocera Mita Corporation, , JP;
Abstract
An image forming apparatus has a photoconductive member on which a latent image is to be formed, a developing roller for developing the latent image on the photoconductive member by a first bias. A magnetic roller forms a magnetic brush thereon with a two-component developer and forms a thin toner layer on the developing roller by a second bias. The developing roller is aluminum with a surface treated for high resistance. The thickness (T) of the toner layer and the duty ratio (D) of the first alternating-current bias satisfy relationships of the following equations for calculating the duty ratio (D) using an application period of a voltage in a direction to transfer the toner from the developing roller towards the photoconductive member as a positive period:7 μm≦T≦13 μm, and35%≦D1≦70%.