Patent ID: 7783224
Filing Date: 2010-08-24
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: a photosensitive body to be developed by a toner; a charger which charges a surface of the photosensitive body with a surface potential; a power supply which supplies one of a normal charging power to perform a normal charging operation and a compensation charging power having a different absolute value than the normal charging power and having the same polarity as the normal charging power, to the charger; a transfer part which faces the photosensitive body, with the printing medium to be printed being interposed therebetween; a medium moving part which moves the printing medium to a transfer region formed between the photosensitive body and the transfer part; and a controller which controls the power supply to supply the normal charging power to the charger before and after a charging time at which a rear end contact surface of the photosensitive body contacting a rear end of a printing medium is charged by the charger, and to supply the compensation charging power to the charger during charging time, wherein the compensation charging power has a larger absolute value than the normal charging power, the power supply supplies one of a normal transfer power to form a printing potential difference to the photosensitive body and perform a normal printing operation, and a separation power to form a potential difference lower than the printing potential difference to the transfer part, and the controller controls the power supply to supply the normal transfer power and the separation power to the transfer part, respectively, before and after a non-printing section reaching time at which the rear non-printing section of the printing medium reaches the transfer region, and a polarity of the normal transfer power is opposite to that of the separation power.