Image forming apparatus with developing unit having a...

Details Image forming apparatus with developing unit having a... Image forming apparatus with developing unit having a...

2011-06-14

2011-06-14

Royer, William J (Department: 2852)

Electrophotography

Image formation

Development

C399S277000

Reexamination Certificate

active

07962073

ABSTRACT:
An image forming apparatus having an image carrier for forming an electrostatic latent image and a developing unit for developing the electrostatic latent image with a two-component developing agent, the developing unit includes: a developing agent carrier for developing the electrostatic latent image to form a visible image, having inside thereof a development main magnetic pole for forming a bristle of a magnetic brush; and a plurality of magnetic poles for conveying the developing agent, wherein the developing unit performs a counter type contact developing method, and wherein, a development area is formed so that, a contact width of the bristle of the magnetic brush is 70% or less with respect to a development width, and a center position of the contact width is positioned on an upstream side with respect to a center position of the development width in a rotation direction of the image carrier.

REFERENCES:
patent: 5860049 (1999-01-01), Kumasaka et al.
patent: 6449452 (2002-09-01), Kai
patent: 6721526 (2004-04-01), Shigeta et al.
patent: 6947692 (2005-09-01), Kondo et al.
patent: 2002-72690 (2002-03-01), None
patent: 2003-330277 (2003-11-01), None
Japanese Office Action for Japanese Patent Application No. 2007-081186 mailed on Apr. 14, 2009 with English translation.

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