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. 05, 2012
Filed:
Jun. 24, 2009
Hiroaki Katoh, Nagaoka, JP;
Naoki Nakatake, Kobe, JP;
Masayuki Hagi, Minoo, JP;
Yoshitaka Sekiguchi, Nishinomiya, JP;
Kazuoki Fuwa, Kawanishi, JP;
Yoshihiro Mikuriya, Nishinomiya, JP;
Hideaki Yasunaga, Ibaraki, JP;
Hiroaki Katoh, Nagaoka, JP;
Naoki Nakatake, Kobe, JP;
Masayuki Hagi, Minoo, JP;
Yoshitaka Sekiguchi, Nishinomiya, JP;
Kazuoki Fuwa, Kawanishi, JP;
Yoshihiro Mikuriya, Nishinomiya, JP;
Hideaki Yasunaga, Ibaraki, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
An image forming method, including charging the surface of an electrostatic latent image bearer by a charger; irradiating the surface of the electrostatic latent image bearer to form an electrostatic latent image thereon; developing the same with a toner to form a toner image; transferring the toner image onto a recording medium; and fixing the toner image thereon, wherein the charger is a charging roller contacting the electrostatic latent image bearer to charge the same, having a ten-point surface roughness of 5 to 30, and the toner includes a binder resin, a colorant, a release agent and an external additive including a composite oxide including titanium oxide in an amount of 80 to 95% by weight and silicon oxide, having a core-shell structure formed of a core including the titanium oxide and a shell including the silicon oxide and has a BET specific surface area of 50 to 100 m/g.