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:
Aug. 21, 2012
Filed:
Jul. 15, 2011
Hiroyuki Hamakawa, Shiki-gun, JP;
Akihiro Watanabe, Ikoma, JP;
Masashi Fujishima, Ikoma, JP;
Hiroshi Yamazaki, Kyoto, JP;
Asami Kotera, Ibaraki, JP;
Sayo Uemura, Amagasaki, JP;
Hiroyuki Hamakawa, Shiki-gun, JP;
Akihiro Watanabe, Ikoma, JP;
Masashi Fujishima, Ikoma, JP;
Hiroshi Yamazaki, Kyoto, JP;
Asami Kotera, Ibaraki, JP;
Sayo Uemura, Amagasaki, JP;
Abstract
A developing unit includes a developing roller which rotates about a rotational axis to supply toner to a photoreceptor, and a magnetic roller which forms a magnetic brush with a two-component developing agent having carrier and the toner and thereby forms a toner layer on the developing roller, the developing roller including: a cylindrical core portion which includes an electric conductor; a first resistive layer which covers a cylindrical surface of the core portion; a second resistive layer which covers the first resistive layer, and has electric-resistivity lower than that of the first resistive layer; and a current leakage control member which prevents leakage of electric current from the core portion toward the second resistive layer through an end of the developing roller along a direction of the rotational axis.