Image forming apparatus

Details Image forming apparatus Image forming apparatus

1997-06-06

1998-09-29

Smith, Matthew S.

Electrophotography

Image formation

Charging

399159, 399175, 399176, G03G 1502

Patent

active

058157778

ABSTRACT:
An image forming apparatus includes: an image bearing member including a surface layer having a volume resistivity which changes with intensity of the electric field; an image forming device for forming, on the image bearing member, an electrostatic image having a portion of dark potential VD (V) and a portion of light potential VL (V) with a resolution of A (dot/micron) the image forming means including a charging member contactable to the image bearing member to charge the image bearing member by applying a voltage of the charging member; wherein the volume resistivity RDL (Ohm.cm) of the surface layer under the electric field of .vertline.VD-VL.vertline..times.A, if larger than 1.0.times.10.sup.11 (Ohm.cm), and is not less than twice as large as RD which is a volume resistivity of the surface layer (Ohm.cm) under the electric field of VD.times.A, and the volume resistivity RD is smaller than 2.0.times.10.sup.13.

REFERENCES:
patent: 5606401 (1997-02-01), Yano
patent: 5666192 (1997-09-01), Mashimo et al.
patent: 5708932 (1998-01-01), Yano et al.

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