(57) @o 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 102 to 106 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 103 to 105 ohms-cm and which are substantially homogeneous in composition.
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