| 摘要 |
A quadruple-tandem type image forming apparatus in which four units of an image forming unit are disposed, and toner images are transferred to a transfer material sequentially, wherein supposing that surface potentials of a photosensitive body in each image forming unit are V0a, V0b, V0c, V0d from upstream in a moving direction of a transfer material toward downstream, development bias voltages in each image forming unit are VBa, VBb, VBc, VBd, and electrification quantities of a toner in each developing unit in each image forming unit are qa. qb, qc, qd, the relations of V0a>=V0b>=V0c>=V0d, VBa>=VBb>=VBc>=VBd, and qa>=qb>=qc>=qd (wherein V0a>V0d, VBa>VBd, qa>qd) are fulfilled.
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