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    • 9. 发明授权
    • Electrophotographic recording apparatus configured to switch a bias
voltage in a developing unit
    • 配置成切换显影单元中的偏置电压的电子照相记录装置
    • US5897243A
    • 1999-04-27
    • US638696
    • 1996-04-26
    • Satoru KomatsubaraKazuhiro YuasaEiji TakenakaMugijiroh UnoToshihiro SugiyamaTetsuo YamanakaEisaku Murakami
    • Satoru KomatsubaraKazuhiro YuasaEiji TakenakaMugijiroh UnoToshihiro SugiyamaTetsuo YamanakaEisaku Murakami
    • G03G15/06G03G15/08
    • G03G15/0808
    • In an electrophotographic image recording apparatus of the type using a single-ingredient type developer, i.e., toner, a latent image is electrostatically formed on a photoconductive drum or similar image carrier. A developing unit has a developing roller for conveying the toner deposited thereon, and an intermediate roller for conveying the toner transferred thereto from the developing roller and depositing it on the latent image to thereby produce a corresponding toner image. An image transfer unit transfers the toner image to a cut sheet. During the development of an area of the image carrier other than a latent image area, at least one of biases assigned to the developing roller and intermediate roller, respectively, is switched over to thereby form an electric field different in direction from an electric field assigned to the formation of the toner image between the two rollers. As a result, the toner existing on the intermediate roller is collected by the developing roller. This successfully prevents the toner from depositing on the intermediate roller except when required, and frees the image transfer unit from the deposition of the toner.
    • 在使用单一成分型显影剂即调色剂的电子照相图像记录装置中,在感光鼓或类似图像载体上静电地形成潜像。 显影单元具有用于输送沉积在其上的调色剂的显影辊和用于输送从显影辊转印到其上的调色剂并将其沉积在潜像上从而产生相应调色剂图像的中间辊。 图像转印单元将调色剂图像转印到切割片。 在除了潜像区域之外的图像载体的区域的显影期间,分别分配给显影辊和中间辊的偏压中的至少一个被切换,从而形成与指定的电场不同的方向的电场 以形成两个辊之间的调色剂图像。 结果,存在于中间辊上的调色剂由显影辊收集。 这成功地防止了调色剂沉积在中间辊上,除非需要,并且使图像转印单元免于调色剂的沉积。