Patent ID: 6757507
Filing Date: 2004-06-29
Classification: G03G

Abstract:
An image formation apparatus for developing an electrostatic latent image with a two-component developer consisting of magnetic carriers and toners, comprising:a development apparatus; and a latent image supporter including a filler in an outermost layer thereof, the development apparatus having a developer supporter and a developer quantity controller, the developer supporter having an internally fixed magnetic body and rotating while supporting the developer on a surface thereof, and the developer quantity controller facing the magnetic body and consisting of materials having rigidity or rigidity and magnetic properties, for controlling a quantity of the developer supported by the developer supporter by controlling a height of magnetic brushes, wherein a ratio of a development gap to a doctor gap between the developer supporter and the controller is from 0.7 to 1.0, a weight-averaged particle diameter of the developer carrier is from 20 to 60 &mgr;m. and a surface roughness of a development sleeve is from 10 to 30 &mgr;m.