Developing device, and image forming method and process cartridge using the developing device

0.30.3A 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...

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Bibliographic Details
Main Authors Yasunaga, Hideaki, Hagi, Masayuki, Mikuriya, Yoshihiro, Sekiguchi, Yoshitaka, Katoh, Hiroaki, Fuwa, Kazuoki, Inoue, Masahide
Format Patent
LanguageEnglish
Published 24.01.2012
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Summary:0.30.3A 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.