Image forming apparatus with image bearing member particle...

Details Image forming apparatus with image bearing member particle... Image forming apparatus with image bearing member particle...

2005-01-04

2005-01-04

Lee, Susan (Department: 2852)

Electrophotography

Image formation

Combined or plural functions by single component

C399S176000

Reexamination Certificate

active

06839530

ABSTRACT:
An image forming apparatus includes an image bearing member; a charging roller cooperable with the image bearing member to form a nip therebetween, for charging the charging roller is rotatable for counterdirectional peripheral movement relative to the image bearing member at the nip; a developing unit for developing with a developer an electrostatic image formed on the image bearing member; wherein the potential of a potential changing portion of the image bearing member changes with respect to the peripheral moving direction of the image bearing member; and wherein at tA (sec) after arrival at an upstream end of the nip, of the potential changing portion, the developing unit is supplied with a voltage for collecting particles from the image bearing member to the developing unit, where tA (sec) is a sum of a time duration required for a surface of the charging roller to move from the upstream end of the nip to a downstream end of the nip and a time duration required for a surface of the image bearing member to move from the downstream end of the nip to a developing zone of the developing unit.

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