Patent ID: 7379682
Filing Date: 2008-05-27
Classification: G03G

Abstract:
1. An electrophotographic image forming device comprising: a photoconductive unit; a charger unit to charge a surface of the photoconductive unit to a first voltage; an imaging unit forming a latent image on the surface of the photoconductive unit by selectively discharging the surface of the photoconductive unit to second voltage, the imaging unit having an adjustable imaging power; a developer roller having a surface biased to a third voltage, the developer roller supplying toner to develop the latent image on the surface of the photoconductive unit; a sensing unit to detect a reflectivity of the toner and a reflectivity of a toner carrying surface on which the toner is deposited; a controller to selectively adjust the imaging power in response to reflectivity values detected by the sensing unit; and wherein the controller further selectively adjusts the imaging power in response to the difference between the first voltage and the third voltage.