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:
Jan. 24, 2012
Filed:
Jan. 24, 2008
Hideaki Yasunaga, Ibaraki, JP;
Masayuki Hagi, Minoh, JP;
Yoshihiro Mikuriya, Nishinomiya, JP;
Yoshitaka Sekiguchi, Nishinomiya, JP;
Hiroaki Katoh, Nagaokakyo, JP;
Kazuoki Fuwa, Toyonaka, JP;
Masahide Inoue, Numazu, JP;
Hideaki Yasunaga, Ibaraki, JP;
Masayuki Hagi, Minoh, JP;
Yoshihiro Mikuriya, Nishinomiya, JP;
Yoshitaka Sekiguchi, Nishinomiya, JP;
Hiroaki Katoh, Nagaokakyo, JP;
Kazuoki Fuwa, Toyonaka, JP;
Masahide Inoue, Numazu, JP;
Ricoh Company Limited, Tokyo, JP;
Abstract
A developing device including a developing roller facing an image bearing member and a toner layer thickness control member to control an amount of a toner adhered to the developing roller, so that an electrostatic latent image formed on the image bearing member is developed with the toner to form a toner image. The following relationships are satisfied: 0.08×10×Dv<Ra<0.18×10×Dv, 2.0<(Ra/RSm)×100<4.0, and 8<Rz<15, where Dv (μm) is a volume average particle diameter of the toner, Ra (μm) is an arithmetical mean roughness of the developing roller in a longitudinal direction, Rz (μm) is a ten-point mean roughness of the developing roller in a longitudinal direction, and RSm (μm) is a mean length of roughness curve elements of the developing roller.