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    • 10. 发明授权
    • Developing unit, image forming apparatus, and developing method
    • 显影单元,成像设备和显影方法
    • US07116933B2
    • 2006-10-03
    • US10948560
    • 2004-09-23
    • Katsumi Okada
    • Katsumi Okada
    • G03G15/08
    • G03G15/0907
    • A developing unit is adapted to an image forming apparatus of an electrophotographic system that has a two component developing agent. The developing unit deposits a thin layer of toner on a developing roller by way of a magnetic brush on a magnetic roller. The toner then is transferred from the developing roller to a photosensitive drum. Developing bias voltages applied to the rollers have DC and AC components. Thus, electric current alternately flows in the magnetic roller and the developing roller to accelerate toner transfer. Sufficient toner is supplied from the magnetic roller to the developing roller, and sufficient toner is recovered from the developing roller to the magnetic roller. This arrangement lowers the amplitude of the AC bias voltage, thereby eliminating an influence on the photosensitive drum. Further, the frequencies of the AC bias voltages are constant. Thus AC bias voltage generating circuits have a low cost.
    • 显影单元适用于具有双组分显影剂的电子照相系统的图像形成装置。 显影单元通过磁刷将磁性辊上的薄层调色剂沉积在显影辊上。 然后将调色剂从显影辊转印到感光鼓上。 施加到辊上的显影偏压具有DC和AC分量。 因此,电流在磁性辊和显影辊中交替流动,以加速调色剂转印。 足够的调色剂从磁辊供应到显影辊,并且足够的调色剂从显影辊回收到磁性辊。 这种布置降低了AC偏置电压的幅度,从而消除了对感光鼓的影响。 此外,AC偏置电压的频率是恒定的。 因此,交流偏压产生电路具有低成本。