Characterization of microscopic electrical defects in xerographic photoreceptors

Microscopic electrical defects in photoreceptors can be a source of serious copy quality degradation, particularly in laser printers operating in the discharge area development mode. In order to study these defects we have constructed an instrument which can measure variations of electrical photoreceptor properties with a resolution of a few tens of μm. The instrument is based on a shielded stylus which is scanned in contact with the …