METHOD AND DEVICE FOR CONTROLLING TRANSFER VOLTAGE ON DUPLEX MODE

摘要

PURPOSE: A method and a device for controlling transfer voltage on a duplex mode are provided to implement an optimal image print quality by supplying the transfer voltage fit to a front side and a rear side of a print sheet corresponding to resistance change of the print sheet on the duplex mode. CONSTITUTION: A transfer roller resistance detector(100) detects the second resistance of a transfer roller. A transfer resistance detector(110) detects the third resistance generated by the front side and the transfer roller. A feed roller resistance detector(120) detects the fifth resistance generated by a feed roller for rear side print and the rear side. A transfer resistance detector(130) detects the fourth resistance of the front side from a difference between the second and the third resistance, or detects the sixth resistance of the rear side from the difference between the fifth and the first resistance. A transfer voltage detector(160) detects the first transfer voltage for the front side transfer according to the second resistance, or detects the second transfer voltage for the rear side transfer by summing the second and the sixth resistance.