US 2006/0133857 A1Published application

Image forming apparatus

AssigneeKonica Minolta Business Technologies, Inc.

InventorsSeiko Itagaki, Hiroshi Akita, Isamu Miura

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Abstract

There is described an image forming apparatus for forming a high-density image by using the reversal developing method and suppressing an occurrence of irregularities. The apparatus includes an image bearing member, a latent image forming device to form an electrostatic latent image, a magnetic field generating device to generate a magnetic field and a developing device to develop the electrostatic latent image so as to form a toner image on the image bearing member. At a developing region, the developer bearing member moves in a direction opposite to a moving direction of the image bearing member and the magnetic field generating device has a developing pole to form a magnetic blush for developing the electrostatic latent image. Further, an outer diameter R (mm) of the developer bearing member and a magnetic flux density Br1 (mT) of the developing pole fulfill the relationship of Br1≧R×4.5.

Claims7

Dependent claims

An image forming apparatus, comprising:

an image bearing member;
a latent image forming device to form an electrostatic latent image on said image bearing member;
a magnetic field generating device to generate a magnetic field to be applied onto both a developer bearing member and said image bearing member;
and
a developing device to develop said electrostatic latent image so as to form a toner image on said image bearing member;
wherein, at a developing region, said developer bearing member moves in a direction opposite to a moving direction of said image bearing member and said magnetic field generating device has a developing pole to form a magnetic blush for developing said electrostatic latent image;
and
wherein an outer diameter of said developer bearing member and a magnetic flux density of said developing pole fulfill the relationship indicated as follow:
Br1≧R×4.5
where Br1 (mT):
magnetic flux density of said developing pole,
R (mm):
outer diameter of said developer bearing member.

10 more elements

Dependencies are inferred from the claim text.