| 摘要 |
A developer supply device, comprising a casing having an opening facing a supply target and a developer reservoir portion provided on an opposite side; a roller-like developer holding body placed around the opening to face the supply target; a main carrying substrate that is located to face the developer holding body at a downstream end portion thereof in a developer transport direction and is configured to carry the developer through a traveling electric field to the developer holding body; and a sub carrying substrate that has a facing part to face the main carrying substrate, the sub carrying substrate being configured to carry the developer from the developer reservoir portion to the facing part through a traveling electric field, and wherein the sub carrying substrate carries the developer in the facing part in a direction opposite to a direction in which the main carrying substrate carries the developer.
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