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:
Jul. 21, 2015
Filed:
Sep. 10, 2013
Shingo Sakashita, Shizuoka, JP;
Junichi Awamura, Shizuoka, JP;
Tsuneyasu Nagatomo, Shizuoka, JP;
Satoshi Kojima, Shizuoka, JP;
Tomoki Murayama, Kanagawa, JP;
Shingo Sakashita, Shizuoka, JP;
Junichi Awamura, Shizuoka, JP;
Tsuneyasu Nagatomo, Shizuoka, JP;
Satoshi Kojima, Shizuoka, JP;
Tomoki Murayama, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developing device, including: a developer bearing member, which is disposed opposite to an electrostatic latent image bearing member and which bears thereon a developer for developing an electrostatic latent image formed on the electrostatic latent image bearing member and conveys the developer to a developing region, wherein the developer includes a toner and a carrier, the toner containing: a toner base containing a binder resin and a colorant; and an external additive, wherein the external additive contains coalescent particles each made up of a plurality of coalescing primary particles, and wherein a work function Wc of the carrier and a work function Ws of the developer bearing member satisfy a relationship of the following formula (1):≧0.4 eV  (1).