Image forming apparatus, image forming process, and process...

Details Image forming apparatus, image forming process, and process... Image forming apparatus, image forming process, and process...

2007-03-20

2007-03-20

Gray, David M. (Department: 2852)

Electrophotography

Having particular structure

Modular or displaceable

C399S115000, C399S168000

Reexamination Certificate

active

10927050

ABSTRACT:
The present invention relates to an image forming apparatus, an image forming process and a process cartridge, in which the image quality and the durability of the photoconductor may be enhanced, images may be formed stably even after the repeated usages, and higher quality and higher stability of images may be established due to the superimposed alternating voltage as well as decrease of the charging hazard on the photoconductor. Specifically, the image forming apparatus according to the present invention comprises a photoconductor, latent electrostatic image forming unit, developing unit a transferring unit, and fixing unit, wherein the charging member is of roller shape disposed proximate to the photoconductor, the photoconductor is charged at the charging nip portion formed between the photoconductor and the charging member, in a condition that satisfies the following Equation:in-line-formulae description="In-line Formulae" end="lead"?4.4×1014≦[(Number of Charged Particles)÷(Circumferential length of the photoconductor)]≦17.7×1014in-line-formulae description="In-line Formulae" end="tail"?wherein the “Number of Charged Particles” refers to the number of charged particles accepted by the photoconductor surface per its unit surface area from the operated charging member, while the photoconductor rotates one round, thus the unit is [number/m2]; and the unit of “Circumferential length of the photoconductor” is [mm].

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