| 摘要 |
A color laser printer is configured to fulfill Qmin<Qs for suppressing occurrence of reverse transfer of toner. Qmin designates the minimum amount of transfer electric charge per unit area required to transfer a toner image of the maximum amount of toner onto a sheet (hereinafter referred to as a "per-unit-area required transfer electric charge level"). Qs designates the maximum amount of transfer electric charge per unit area which can prevent occurrence of reverse transfer (hereinafter referred to as an "transfer prevention per-unit-area electric charge level"). The transfer prevention per-unit-area electric charge level Qs is represented by Qs=a/(Md)<SUP>2</SUP>. Md designates the maximum quantity of developing agent on a toner image per unit area thereof transferred onto a sheet immediately before being transferred, and "a" designates a proportional constant.
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