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    • 5. 发明授权
    • Image forming apparatus with developing recovery device
    • 具有显影恢复装置的图像形成装置
    • US5864736A
    • 1999-01-26
    • US790788
    • 1997-01-30
    • Hirokatsu ShimadaTamotsu SakurabaAkihiro Kawasaki
    • Hirokatsu ShimadaTamotsu SakurabaAkihiro Kawasaki
    • G03G21/10G03G15/08G03G21/00G03G15/30
    • G03G21/0064G03G2215/021G03G2221/0005
    • Cleaning effectiveness is improved, and inadequate charging of the photosensitive member due to soiling of the charging brush as well as image noise such as background fog are suppressed by a developing device capable of recovering residual toner regardless of the toner charge polarity. In an image forming apparatus provided with a developing device including a developing sleeve for developing an electrostatic latent image on photosensitive member via toner and recovering residual toner from the surface of photosensitive member, a power unit is provided for forming a direct current electric field between photosensitive member and developing sleeve during developing, and forming alternating current electric fields between photosensitive member and developing sleeve 16 during cleaning of residual toners.
    • 清洁效果提高,并且由于充电刷的污染以及图像噪声(如背景灰雾)导致的感光构件的充电不足,通过能够回收残留调色剂的显影装置而被抑制,而与调色剂电荷极性无关。 在具有显影装置的图像形成装置中,该显影装置包括用于通过调色剂在感光构件上显影静电潜像并从感光构件的表面回收残留调色剂的显影套筒,提供用于在感光体之间形成直流电场的动力单元 在显影期间构件和显影套筒,并且在清洁残余调色剂期间在感光构件和显影套筒16之间形成交流电场。