| 摘要 |
PURPOSE:To provide an image of high picture quality with a favourable color reproduction property and without causing any problems of blur and other of letters and lines even in a multiple color mode to transfer a developed image to a transcribing material in the lump by way of forming the multiple color developed image on an image holding body. CONSTITUTION:To a development roller 11, bias voltage which direct current voltage of +340V is superimposed on alternating voltage of 200Hz, 1300Vpp is applied, additionally, direct current voltage of +260V is applied between the development roller 11 and a supply roller 13, and bias is set so that electric potential of the supply roller 13 always becomes higher than electric potential of the development roller 11 by 200V. Consequently, toner on the supply roller 13 is transferred to the development roller 11, and on the surface of the development roller 11, a toner layer of specified layer thickness is formed. Toner of the development roller 11 develops a latent image on a photoreceptor 1 at a development position facing the photoreceptor 1. |
