IMAGE FORMATION DEVICE AND PROCESS CARTRIDGE

Title:

IMAGE FORMATION DEVICE AND PROCESS CARTRIDGE

Document Type and Number:

WIPO Patent Application WO/2014/207871

Kind Code:

A1

Abstract:

Provided are an image formation device and a process cartridge with which it is possible to prevent the generation of an image with vertical streaks caused by cleaning defects. The image formation device and the cartridge have: a charging member, which has on its surface recesses deriving from the openings of bowl-shaped resin particles, and protrusions deriving from the openinig edges of the bowl-shaped resin particles; and a toner for which the diffusion index represented in Formula 1 satisfies Formula 2 when the coverage ratio (X1) of fine silica particles on the surface of the toner is an area ratio of 50.0-75.0% and the theoretical coverage ratio of the fine silica particles is X2. Formula 1: diffusion index = X1/X2 Formula 2: diffusion index ≥ −0.0042×X1+0.62

Inventors:

TANIGUCHI TOMOHITO (JP)
AOYAMA TAKEHIKO (JP)
SATO TAICHI (JP)
MIYAGAWA NOBORU (JP)
WATANABE MASAHIRO (JP)
UEMATSU ATSUSHI (JP)
SUZUMURA YOSHITAKA (JP)

Application Number:

PCT/JP2013/067712

Publication Date:

December 31, 2014

Filing Date:

June 27, 2013

Export Citation:

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Assignee:

CANON KK (JP)

International Classes:

G03G15/02; G03G9/08

Foreign References:

JP2011248353A	2011-12-08
JP2012141386A	2012-07-26
JP2011107375A	2011-06-02
JP2013047754A	2013-03-07
JP2013134447A	2013-07-08