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:
Nov. 19, 2013
Filed:
Dec. 29, 2010
Yoshiko Ogawa, Tokyo, JP;
Yasuyuki Ishii, Tokyo, JP;
Hideki Kosugi, Kanagawa, JP;
Masaaki Yamada, Tokyo, JP;
Atsushi Kurokawa, Kanagawa, JP;
Yuji Ishikura, Kanagawa, JP;
Yoshiko Ogawa, Tokyo, JP;
Yasuyuki Ishii, Tokyo, JP;
Hideki Kosugi, Kanagawa, JP;
Masaaki Yamada, Tokyo, JP;
Atsushi Kurokawa, Kanagawa, JP;
Yuji Ishikura, Kanagawa, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
A development device includes a developer container, a rotary developer carrier that is disposed facing the latent image carrier and including multiple outer electrodes arranged in a circumferential direction of the developer carrier, an inner electrode electrically insulated from the multiple outer electrodes, an insulation layer disposed between the inner and outer electrodes, and a surface layer overlaying the outer electrodes and electrically insulating the multiple outer electrodes from each other, a bias power source to generate electrical fields that change with time by applying a first and second bias voltages to the inner and outer electrodes, respectively, an electrical field adjuster to regulate the electrical fields in accordance with a thickness of the surface layer of the developer carrier, and a controller.