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:
Oct. 18, 2011
Filed:
Mar. 14, 2008
Hideaki Yasunaga, Ibaraki, JP;
Masayuki Hagi, Minoh, JP;
Yoshihiro Mikuriya, Nishinomiya, JP;
Hiroaki Katoh, Nagaokakyo, JP;
Kazuoki Fuwa, Toyonaka, JP;
Masahide Inoue, Numazu, JP;
Yoshitaka Sekiguchi, Nishinomiya, JP;
Satoshi Ogawa, Nara, JP;
Hideaki Yasunaga, Ibaraki, JP;
Masayuki Hagi, Minoh, JP;
Yoshihiro Mikuriya, Nishinomiya, JP;
Hiroaki Katoh, Nagaokakyo, JP;
Kazuoki Fuwa, Toyonaka, JP;
Masahide Inoue, Numazu, JP;
Yoshitaka Sekiguchi, Nishinomiya, JP;
Satoshi Ogawa, Nara, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
An image developer using a one-component developer, Including a developing roller visualizing an electrostatic latent image formed on an image bearer with a pulverized toner; and a feed roller feeding the pulverized toner to the developing roller while contacting thereto, wherein the pulverized toner includes a parent toner; a wax; and an external additive comprising an additive having a number-average particle diameter of from 20 to 60 nm and adhering to the surface of the parent toner at an adherence strength of from 50 to 70%, and wherein the following relationships (1) to (3) are satisfied:4.70<LogR<5.70  (1)8.00<LogZ<10.70  (2)−6.25*Log+37.5<Log<−6.25*Log+45.6  (3)wherein R represents a resistivity of the developing roller and Z represents an impedance of the pulverized toner.