| 摘要 |
<p>A contact brush charging device (11) for charging an insulating layer, especially the photoreceptor (13) in a xerographic repdocution apparatus, comprises a plurality of resiliently, flexible thin fibers (31) which have an electrical resistivity in the range from 10<2> to 10<6> ohms-cm and which are substantially resistivity stable to changes in relative humidity and temperature over the normal operating range and ageing. In a preferred embodiment the fibers are arranged in a uniform distribution along the length of the brush and comprise partially carbonized polyacrylonitrile fibers which have an electrical resistivity in the range from 10<3> to 10<5> ohms-cm and which are substantially homogeneous in composition.</p> |
