Method and device for supplying a variable bias voltage to a developing roller

摘要

A method and a device for supplying a developing bias voltage capable of minimizing toner consumption by reducing wasted toner during a printing operation in the image forming apparatus. The image forming apparatus comprises a photosensitive drum for forming an electrostatic latent image, a charger for providing a predetermined charging voltage to the photosensitive drum such that different bias voltages are supplied to image and non-image areas, an exposure unit for forming the electrostatic latent image on the photosensitive drum by providing image data, a developing unit for developing the electrostatic latent image formed on the photosensitive drum by toner, a transfer unit for transferring the developed toner to a printing paper, and a developing bias controller./!