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:
Jan. 05, 1993
Filed:
Jul. 19, 1991
Masayuki Nishimura, Iwatsuki, JP;
Hiromu Ono, Suzuka, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
The invention is applied to a developing device having a cylindrical toner carrying body. The cylindrical toner carrying body includes a cylindrical electrically conductive inner layer and a cylindrical semiconductor outer layer. The surface potential at the semiconductive outer layer is controlled by power supplies connected to the electrically conductive inner layer, so that particles of a single-component toner charged by friction can adhere to the semiconductive outer layer surface. In such a developing device having the thus constructed toner carrying body, the electrically conductive inner layer is formed of a cylindrical sleeve made of an electrically conductive metallic material, and the semiconductive outer layer not only is formed of a semiconductive resin layer coated on the outer peripheral surface of the cylindrical sleeve but also has uniform irregularities on its surface.