公开(公告)号：US5227842A

公开(公告)日：1993-07-13

申请号：US855092

申请日：1992-03-20

申请人： Kouji Hayashi ,  Takashi Bisaiji ,  Norimitsu Kikuchi ,  Takeyoshi Sekine ,  Noboru Sawayama ,  Takayuki Maruta ,  Tetsuro Miura ,  Kazunori Bannai ,  Kazunari Yamada ,  Nobuhiro Nakayama

发明人： Kouji Hayashi ,  Takashi Bisaiji ,  Norimitsu Kikuchi ,  Takeyoshi Sekine ,  Noboru Sawayama ,  Takayuki Maruta ,  Tetsuro Miura ,  Kazunori Bannai ,  Kazunari Yamada ,  Nobuhiro Nakayama

IPC分类号： G01N21/47 ,  G03G15/00 ,  G03G15/01 ,  G03G15/06 ,  G03G15/08

CPC分类号： G03G15/065 ,  G03G15/0848 ,  G03G15/5041 ,  G03G2215/00042

摘要： An image forming apparatus having a developing device of the type using a two-component type developer and developing an electrostatic latent image by a bias electric field having an alternating electric field. A predetermined reference latent image is electrostatically formed on an image carrier by a reference latent image forming device and then developed by the developing device to become a reference toner image. An irregularity detecting circuit determines the degree of difference between the density of the edge and the density of the central portion of the reference toner image. A bias electric field control circuit controls the bias electric field in matching relation to the output of the irregularity detecting circuit, thereby preventing the image quality from being degraded by a change in the resistance of the carrier.

摘要翻译： 一种图像形成装置，其具有使用双组分型显影剂的类型的显影装置，并且通过具有交变电场的偏置电场显影静电潜像。 通过参考潜像形成装置在图像载体上静电地形成预定的参考潜像，然后由显影装置显影，成为基准调色剂图像。 不规则检测电路确定边缘的密度与基准调色剂图像的中心部分的密度之间的差异程度。 偏置电场控制电路控制与不规则检测电路的输出匹配关系的偏置电场，从而防止图像质量由于载波电阻的变化而劣化。