Patent ID: 6169868
Filing Date: 2001-01-02
Classification: H04N

Abstract:
An electrophotographic apparatus comprising: a photosensitive member, said photosensitive member showing difference in charging characteristic or in sensitivity characteristic in a longitudinal direction thereof; electrostatic image forming means for forming an electrostatic image on said photosensitive member, said electrostatic image forming means including charging means for charging said photosensitive member and exposure means for exposing said photosensitive member, charged by said charging means, according to an image signal; and development means for reverse development of said electrostatic image with a developer; wherein maximum potential difference .DELTA.VD (volt) in a potential of a dark portion of the electrostatic image in the longitudinal direction, maximum potential difference .DELTA.VL in a potential of a light portion of the electrostatic image in the longitudinal direction, a value a (1/volt) represented by (variation amount in density, in the longitudinal direction, in the image formed by developing the light portion with said developing means)/(the maximum potential difference .DELTA.VD) and a value b (1/volt) represented by (variation amount in density, in the longitudinal direction, in the image formed by developing the light portion with said developing means)/(said maximum potential difference .DELTA.VL) satisfy a relation: -0.3.ltoreq.a.times..DELTA.VD+b.times..DELTA.VL.ltoreq.0.3 in which 100.gtoreq..vertline..DELTA.VD.vertline..gtoreq.20 and 100.gtoreq..vertline..DELTA.VL.vertline..gtoreq.20.