| 摘要 |
PURPOSE:To restrain the scattering of developer, to prevent the blurring of an image and to obtain more sharp image by forming the contact surface of a transfer electrode with recording paper as a curved surface having specified curvature. CONSTITUTION:The recording paper is supplied to a photoreceptor 14 from a resist roller 44 through a paper guide 46, and a toner image formed on the outer surface of the photoreceptor 14 is transferred. At the time of transferring, transfer voltage having a polarity(positive) reverse to the electrostatic charging polarity(negative) of insulating non-magnetic toner 36 is applied to the transfer electrode 50 of a transfer device 10 from a transfer power source 51, so that transfer electric field is formed. Toner 36 is preferentially transferred on the recording paper by the transfer electric field. In such a case, the contact surface of the transfer electrode 50 is formed as the curved surface having the specified curvature, so that the width of the transfer electric field is made narrower than in the conventional manner, and transfer time is shortened. Thus, the scattering of the developer 40 caused by the reciprocation of conductive magnetic toner 38 is restrained. |
