Patent ID: 7050745

Claim:
A two-component developer unit comprising: an agitating unit which agitates a developer having a carrier and toner; a developer magnet roller which has a magnet roller disposed adjacent to the agitating unit and given a predetermined magnetic flux density and a developer sleeve rotating a circumferential surface of the magnet roller, and which adsorbs the developer thereon by using a magnetic force and returns the developer to the agitating unit; a developer blade which faces the developer magnet roller and is disposed to be spaced apart from the developer magnet roller by a predetermined control distance along an effective development width of the developer magnet roller and controls a thickness of the developer adhering to the developer magnet roller; and a developer rectifier which guides the developer transferred by the developer magnet roller to the developer blade, which includes a lifting guide portion to guide the developer agitated by the agitated unit so as to transfer the developer toward the developer blade along a circumferential direction of the developer magnet roller, and which includes a developer collection guide portion that retains the developer collected by the lifting guide portion between the developer blade and the developer collection guide portion, the developer rectifier disposed between the agitating unit and the developer blade, the lifting guide portion being substantially L-shaped and comprising a first portion extending along a line which intersects the developer magnet roller and a second portion substantially at a right angle to the first portion, extending along a line which does not intersect the developer magnet roller, and downstream relative to the first portion in a guiding direction of the developer.