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:
Jun. 03, 2014
Filed:
Jul. 01, 2009
Osamu Wada, Osaka, JP;
Takanori Kamoto, Osaka, JP;
Tadashi Iwamatsu, Osaka, JP;
Nobuyuki Yoshioka, Osaka, JP;
Hiroyuki Hirakawa, Osaka, JP;
Yoshinori Mutoh, Osaka, JP;
Takashi Hara, Osaka, JP;
Hirofumi Kanda, Osaka, JP;
Yoshio Ichii, Osaka, JP;
Osamu Wada, Osaka, JP;
Takanori Kamoto, Osaka, JP;
Tadashi Iwamatsu, Osaka, JP;
Nobuyuki Yoshioka, Osaka, JP;
Hiroyuki Hirakawa, Osaka, JP;
Yoshinori Mutoh, Osaka, JP;
Takashi Hara, Osaka, JP;
Hirofumi Kanda, Osaka, JP;
Yoshio Ichii, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The resin coated carrier is used with a toner in which an external additive having an average primary particle size of 50 nm or more is added to a toner particle, and has a carrier core and a resin coating layer on the surface of the carrier core. In the resin coated carrier, the following expression (1) is satisfied:0.5≦−log {()/()}≦2.5  (1)wherein A represents a volume resistance value (Ω/cm) of the resin coated carrier in an electric field of 1000 V/cm that is obtained by conducting a stirring test, B represents a volume resistance value (Ω/cm) of the resin coated carrier in an electric field of 1000 V/cm before the stirring test, and C represents a volume resistance value (Ω/cm) of the carrier core in an electric field of 1000 V/cm.