Patent ID: 7035561

Claim:
An image developing apparatus comprising: a first electricity source; a second electricity source; an image density detecting means for detecting image density from image data for an image being developed at the present time; a controller for controlling each of said first electricity source and said second electricity source so that a difference between a first voltage provided by said first electricity source and a second voltage provided by said second electricity source becomes larger as said image density detected by said image density detecting means increases and becomes smaller as said image density detected by said image density detecting means decreases; a developing means impressed with said first voltage provided by said first electricity source; and a developing material supplying means impressed with said second voltage provided by said second electricity source, supplying developing material to said developing means, wherein said controller, after controlling each of said first electricity source and said second electricity source according to said image density, causes said developing material to be transferred onto an image holder, so as to form said image being developed.