| 摘要 |
PROBLEM TO BE SOLVED: To provide an image formation apparatus capable of suppressing a cost without including a plurality of bias power sources even if each of a plurality of photoreceptor drums adopts a shift system in primary transfer.SOLUTION: An image formation apparatus 1 comprises: a photoreceptor drum 9 which has a different surface potential corresponding to the toner type for each image formation part; a transfer belt 7 which has an electric resistance; a primary transfer roller 18 which is arranged so as to be deviated to the downstream side on the opposite side to the photoreceptor drum 9 via the transfer belt 7; a sleeve 35 which covers a shaft core metal of the primary transfer roller 18; and one power source 33 which supplies the same bias power source in the lump to each primary transfer roller 18. With respect to apparent resistances Ra, Rb, Rc, Rd of previously-known development regions KCMY and resistances RK, RC, RM, RY of the transfer belt 7 from each primary transfer roller 18 to the development regions KCMY, resistances w, x, y, z of the sleeves 35 of the primary transfer rollers 18 of development regions KCMY are set to satisfy w+RK+Ra=x+RC+Rb=y+RM+Rb=z+RY+Rb.SELECTED DRAWING: Figure 4 |
