Patent ID: 9081335
Filing Date: 2015-07-14
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image carrier that carries a toner image; a nip forming member that forms a transfer nip between the image carrier and the nip forming member; and a power supply that outputs a transfer voltage in which an AC component is superimposed on a DC component to transfer the toner image from the image carrier onto a sheet at the transfer nip, wherein the transfer voltage is switched alternately between a first peak value Vt having a first polarity to move the toner image from the image carrier onto the sheet and a second peak value Vr having a second polarity that is opposite to the first polarity, wherein an absolute value of a time average value Vave of the transfer voltage is larger than an absolute value of a center value Voff between the first peak value Vt and the second peak value Vr, wherein an absolute value of the second peak value Vr is larger than the absolute value of the time average value Vave, and wherein the transfer voltage is set such that a relation between a frequency f Hz of the AC component, a nip width d mm of the transfer nip in an image carrier surface movement direction, and a surface movement speed v mm/s of the image carrier satisfies the following equation 1: