Electrophotographic apparatus

Details Electrophotographic apparatus Electrophotographic apparatus

1996-11-26

1998-08-18

Smith, Matthew S.

Electrophotography

Image formation

Photoconductive member

430 56, 430 66, 430127, G03G 1500

Patent

active

057970718

ABSTRACT:
To form sharp image free from flow of image or fog with an electrophotographic apparatus, which uses an a-Si photo-sensitive drum charged uniformly by having resort to the discharge phenomenon, the electrophotographic apparatus comprises an electrophotographic photo-sensitive drum having a surface layer being represented by an elementary ratio composition formula ( a-Si.sub.1-x C.sub.x :H ), x being 0.95.ltoreq..times.<1, the dynamic indentation hardness of the upper surface layer being 300 kgf/mm.sup.2 or below, the hardness of said surface layer being higher on the inner side of said photoconductive layer than on the outer surface side, preferably being gradually increasing as one goes toward the inner side of said photoelectric layer from the outer surface side, and a developing unit using a developer composed of carrier and toner particles being caused to rub the drum surface and recovered said developer in a developer vessel. The temperature of said photosensitive drum surface and said developer vessel being held in a range 0 to +10.degree. C., the developer used for the development contained a conductive abrasive having a volume resistivity ranging from 10.sup.2 to 10.sup.10 .OMEGA..multidot.cm, the peripheral speed of a transfer roller is set to be slightly higher than the peripheral speed of the drum.

REFERENCES:
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patent: 4764448 (1988-08-01), Yoshitomi et al.
patent: 4770966 (1988-09-01), Kazama et al.
patent: 4794064 (1988-12-01), Yamazaki et al.
patent: 4833055 (1989-05-01), Kazama et al.
patent: 5159393 (1992-10-01), Hiroshima et al.
patent: 5612160 (1997-03-01), Inoue et al.

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