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    • 9. 发明授权
    • Image forming apparatus using an electrophotographic process
    • 使用电子照相方法的图像形成装置
    • US07113713B2
    • 2006-09-26
    • US10921183
    • 2004-08-19
    • Takamitsu SodaTatsuya Kobayashi
    • Takamitsu SodaTatsuya Kobayashi
    • G03G15/16G03G15/00
    • G03G15/168G03G2221/0005
    • An image forming apparatus includes a first image bearing member, a movable second image bearing member, a charging device and a voltage applying device. A toner image is transferred from the first image bearing member to the second image bearing member at a first transfer portion, and the toner image is transferred from the second image bearing member to a transfer material at a second transfer portion. The charging device is opposed to the second image bearing member at a downstream side of the second transfer portion and at an upstream side of the first transfer portion with respect to a moving direction of the second image bearing member. The voltage applying device switches a DC voltage from a first voltage to a second voltage which is opposite in polarity to the first voltage. The switching from the first voltage to the second voltage is executed at a predetermined number of transfers of the toner image from the second image bearing member to the transfer material, and the predetermined number varies depending on an image forming condition.
    • 图像形成装置包括第一图像承载部件,可移动第二图像承载部件,充电装置和施加电压装置。 调色剂图像在第一转印部分从第一图像承载部件转印到第二图像承载部件,并且调色剂图像在第二转印部分从第二图像承载部件转印到转印材料上。 充电装置在第二转印部的下游侧和第二转印部的上游侧相对于第二图像承载部件的移动方向与第二图像承载部件相对。 电压施加装置将DC电压从第一电压切换到与第一电压极性相反的第二电压。 从第二图像承载部件到转印材料的调色剂图像的预定次数的转印执行从第一电压到第二电压的切换,并且预定数量根据图像形成条件而变化。