| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve a toner cloud development phenomenon of high image quality and toner separation in a non-contact cloud development using a donor roll, by preventing the image deterioration and color mixing of multi-color toner which are caused by a toner-scattering electric field high in a development nip, and by peeling toner under conditions which are set wider than those in the case where a charging mechanism is disposed in the development nip. <P>SOLUTION: In the non-contact cloud development using the donor roll, a traveling wave electrode for development, which generates a travelling wave electric field, is disposed upstream of a development nip, formed by the donor roll and a photoreceptor and opposite the donor roll; and in addition, a travelling electrode for separation is disposed downstream of the development nip and opposite the donor roll, and by setting the gap between the donor roll and the travelling wave electrode to be widened in the direction of the traveling wave of the electrode, efficiently peeling of toner from the donor roll is carried out. <P>COPYRIGHT: (C)2009,JPO&INPIT |
