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:
Feb. 05, 2019
Filed:
Aug. 31, 2015
Hitoshi Iwatsuki, Shizuoka, JP;
Koichi Sakata, Shizuoka, JP;
Hiroshi Tohmatsu, Shizuoka, JP;
Toyoaki Tano, Shizuoka, JP;
Kenichi Mashiko, Shizuoka, JP;
Mariko Takii, Kanagawa, JP;
Hiroyuki Kishida, Shizuoka, JP;
Yoshihiro Murasawa, Shizuoka, JP;
Keinosuke Kondoh, Kanagawa, JP;
Toshio Koike, Tokyo, JP;
Yutaka Takahashi, Kanagawa, JP;
Hitoshi Iwatsuki, Shizuoka, JP;
Koichi Sakata, Shizuoka, JP;
Hiroshi Tohmatsu, Shizuoka, JP;
Toyoaki Tano, Shizuoka, JP;
Kenichi Mashiko, Shizuoka, JP;
Mariko Takii, Kanagawa, JP;
Hiroyuki Kishida, Shizuoka, JP;
Yoshihiro Murasawa, Shizuoka, JP;
Keinosuke Kondoh, Kanagawa, JP;
Toshio Koike, Tokyo, JP;
Yutaka Takahashi, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developing device, including: a developer containing toner and carrier; and developer bearer configured to have surface thereof bear the developer and endlessly move, and to develop latent image over surface of latent image bearer by supplying toner in developer to latent image in developing region facing the latent image bearer, wherein carrier contains fine particles, value X in volume resistivity R (=10) (Ω·cm) of carrier is 11.5-16.0, developer bearer includes: magnetic field generating unit including a plurality of magnetic poles; and developing sleeve having a cylindrical shape enclosing magnetic field generating unit, and configured to bear developer over outer circumferential surface of cylindrical shape by magnetic force of the magnetic field generating unit and perform surface moving by rotating relative to developing device body, and developing device includes developing sleeve voltage applying unit configured to apply AC component-containing voltage to developing sleeve.