IMAGE FORMING APPARATUS

To provide an image forming apparatus that can select a usage mode for reducing the amount of electricity used, while reducing the difference in image quality between usage modes.SOLUTION: An image forming apparatus comprises: an image holding body; charging means that applies a charging bias to cha...

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Bibliographische Detailangaben
Hauptverfasser: HAGIWARA CHIHIRO, ISHIBASHI JUNICHI, JITSUKATA KEIJI, TANAKA SATOSHI
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide an image forming apparatus that can select a usage mode for reducing the amount of electricity used, while reducing the difference in image quality between usage modes.SOLUTION: An image forming apparatus comprises: an image holding body; charging means that applies a charging bias to charge the image holding body to have a charging potential according to the charging bias; developing means that develops an electrostatic latent image formed on the image holding body to form a toner image; and selection means that can select any one of a first mode for applying, to the developing means, a first developing bias in which a DC voltage and an AC voltage are superimposed, and a second mode for applying, to the developing means, a second developing bias consisting only of a DC voltage.SELECTED DRAWING: Figure 13 【課題】使用モードによる画像品質の差異を抑えながら、使用電力量を抑制する使用モードを選択することができる画像形成装置を提供する。【解決手段】像保持体と、帯電バイアスを印加して像保持体を帯電バイアスに応じた帯電電位に帯電する帯電手段と、像保持体上に形成された静電潜像をトナーにより現像してトナー像を形成する現像手段と、自装置の使用電力量に応じて、現像手段に直流電圧と交流電圧とが重畳された第1の現像バイアスを印加する第1モードと、現像手段に直流電圧のみからなる第2の現像バイアスを印加する第2モードと、のいずれかを選択可能な選択手段と、を備えた。【選択図】図13