Development apparatus, image forming apparatus and development method

摘要

In a development apparatus of the hybrid method using a component developer, a development apparatus and a development method that prevent the reduction of density or the occurrence of residual images (ghost images) and can carry out good image forming over a long period. A development apparatus having the feature that the surfaces of the toner supporting member and the developer supporting member move in a mutually opposite direction at the part that they are opposite to each other, and the electric field in the closest part applied in a direction to recover the toner from the toner supporting member to the developer supporting member is in the range from 2.5x10⁶ V/m to 5x10⁶ V/m, and the share (PD) of the developer in the space of the closest part of the opposing portion satisfies the following relationship. 0.09<=PD<=650xDss