Patent ID: 6070024
Filing Date: 2000-05-30
Classification: G03G

Abstract:
An image forming apparatus comprising:developing agent image forming means for forming a developing agent image on an image carrier;conveying means for conveying a transfer material toward the image carrier;detecting means for detecting a size of the transfer material conveyed by the conveying means;transfer means arranged opposite the image carrier which applies transfer charges to the transfer material conveyed by the conveying means to transfer a developing agent image which is formed on the image carrier onto the transfer material, the transfer means applying a transfer charge of a first charge amount to a first area of the transfer material including a leading edge thereof, applying a transfer charge of a second charge amount smaller than the first charge amount to a second area of the transfer material following the first area, and applying a transfer charge of a third charge amount smaller than the second charge amount to a third area of the transfer material including a trailing edge thereof and following the second area of the transfer material; andcontrol means for, on the basis of the result of detection by the detecting means, controlling a timing by which the switching of the transfer charges by the transfer means is performed.