Title:
DEVELOPING APPARATUS AND ELECTRONIC PHOTOGRAPH IMAGE FORMING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2009/104501
Kind Code:
A1
Abstract:
Disclosed is a developing apparatus that, even in a discontinuous printing mode having a rest period, can suppress a fluctuation in image density. The developing apparatus comprises at least a developing agent for developing an electrostatic latent image formed on a photoconductor drum, a developing agent carrier for supporting and transporting the developing agent, and a developing agent layer thickness control means disposed near the developing agent carrier for controlling the amount of the developing agent supported and transported on the developing agent carrier. The developing agent is a negatively chargeable monocomponent magnetic toner that comprises magnetic toner particles containing at least a binder resin and magnetic iron oxide particles and having specific saturation magnetization, weight average particle diameter, and composition. The developing agent carrier has a surface layer comprising a binder resin, a quaternary ammonium salt, graphitized particles, and electroconductive spherical resin particles and has a specific surface shape.
Inventors:
MATSUDA TAKUMA (JP)
SHIMAMURA MASAYOSHI (JP)
AKASHI YASUTAKA (JP)
OTAKE SATOSHI (JP)
ITO MINORU (JP)
WAKABAYASHI KAZUHITO (JP)
YOSHIBA DAISUKE (JP)
SHIMAMURA MASAYOSHI (JP)
AKASHI YASUTAKA (JP)
OTAKE SATOSHI (JP)
ITO MINORU (JP)
WAKABAYASHI KAZUHITO (JP)
YOSHIBA DAISUKE (JP)
Application Number:
PCT/JP2009/052254
Publication Date:
August 27, 2009
Filing Date:
February 04, 2009
Export Citation:
Assignee:
CANON KK (JP)
MATSUDA TAKUMA (JP)
SHIMAMURA MASAYOSHI (JP)
AKASHI YASUTAKA (JP)
OTAKE SATOSHI (JP)
ITO MINORU (JP)
WAKABAYASHI KAZUHITO (JP)
YOSHIBA DAISUKE (JP)
MATSUDA TAKUMA (JP)
SHIMAMURA MASAYOSHI (JP)
AKASHI YASUTAKA (JP)
OTAKE SATOSHI (JP)
ITO MINORU (JP)
WAKABAYASHI KAZUHITO (JP)
YOSHIBA DAISUKE (JP)
International Classes:
G03G15/08; G03G9/083
Foreign References:
| JP2007206647A | 2007-08-16 | |||
| JP2006276714A | 2006-10-12 | |||
| JP2005134750A | 2005-05-26 | |||
| JP2005099703A | 2005-04-14 | |||
| JP2005077870A | 2005-03-24 |
Other References:
See also references of EP 2246748A4
None
None
Attorney, Agent or Firm:
OKABE, Masao et al. (Fuji Bldg. 2-3, Marunouchi 3-chome, Chiyoda-k, Tokyo 05, JP)
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