Patent ID: 7986891
Filing Date: 2011-07-26
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: an image supporting member for forming a developer image in a specific patch pattern, said specific patch pattern including a first portion having a first length, a second portion having a second length, and a third portion having a third length, said specific patch pattern having a fourth length equal to a sum of the first length, the second length, and the third length; a developing unit for forming a developer layer and forming the developer image on the image supporting member using developer of the developer layer, said developing unit having a circumferential length equal to the first length; a developer supplying unit for supplying the developer to the developing unit, said developer supplying unit having a circumferential length greater than the second length; an image density detection unit for detecting an image density difference between an image density of the developer image in the second portion and an image density of the developer image in the third portion; and a control unit for controlling a voltage applied to the developing unit and the developer supplying unit, said control unit correcting the voltage applied to at least one of the developing unit and the developer supplying unit according to the image density difference detected with the image density detection unit.