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    • 5. 发明授权
    • Electrophotographic image forming apparatus
    • 电子照相成像设备
    • US09091969B2
    • 2015-07-28
    • US14173044
    • 2014-02-05
    • Ryuji YoshidaHideki ZembaYusuke MitaniShotaro HoshiMasahiko ShakutoHiroaki Maeda
    • Ryuji YoshidaHideki ZembaYusuke MitaniShotaro HoshiMasahiko ShakutoHiroaki Maeda
    • G03G15/16G03G15/02G03G15/06
    • G03G15/1675G03G15/0266G03G15/065
    • An image forming apparatus includes a charging bias output device, a developing bias output device, a transfer bias output device, and a controller. The controller controls the transfer bias output device to supply a transfer bias from a time at which a first position of a photosensitive member arrives at a transfer position after the charging bias output device starts supplying a charging bias. An initial value of the transfer bias is controlled to be smaller than a normal set value for a predetermined time period which is a time after the transfer bias starts to be supplied and within a time corresponding to a rise time during which a surface potential of the photosensitive member reaches a predetermined potential after the charging bias starts to be output. The first position of the photosensitive member is a position at which the charging device starts charging the photosensitive member.
    • 图像形成装置包括充电偏压输出装置,显影偏压输出装置,转印偏压输出装置和控​​制器。 控制器控制转印偏压输出装置,以在充电偏压输出装置开始提供充电偏压之后从感光元件的第一位置到达转印位置的时间提供转印偏压。 转移偏压的初始值被控制为小于正常设定值,该预定时间段是在转印偏差开始被提供之后的时间内,并且在与上述时间相对应的时间内, 感光元件在充电偏压开始输出之后达到预定电位。 感光构件的第一位置是充电装置开始对感光构件充电的位置。