Patent ID: 6246847
Filing Date: 2001-06-12
Classification: G03G

Abstract:
An apparatus, comprising:a photoconductive drum;a charging roller being positioned adjacent to said photoconductive drum, said charging roller charging said photoconductive drum with an electrical charge;a laser scanning unit forming an electrostatic latent image on said photoconductive drum corresponding to data;a developing roller supplying toner to said photoconductive drum, the toner received at said electrostatic latent image on said photoconductive drum forming a visible image on said photoconductive drum;a supplying roller supplying toner to said developing roller;a pre-transfer lamp reducing an attached force of the toner attached to said photoconductive drum to a predetermined level;a transferring roller transferring toner from said photoconductive drum to a recordable medium to form an image on the recordable medium;a controller varying voltages of said transferring roller according to a predetermined standard, transferring positively charged toner and negatively charged toner from said transferring roller to said photoconductive drum when racing said transferring roller and said photoconductive drum after the image is formed on the recordable medium; anda power supply supplying power to said charging roller, laser scanning unit, transferring roller, developing roller, photoconductive drum, pre-transfer lamp, and controller, said power supply forming a potential difference among said developing roller and said photoconductive drum to collect negatively-charged toner from said photoconductive drum to said developing roller.