Apparatus and method for contact charging an amorphous silicon p

Details Apparatus and method for contact charging an amorphous silicon p Apparatus and method for contact charging an amorphous silicon p

1996-08-16

1998-08-18

Royer, William J.

Electrophotography

Image formation

Charging

361225, 399175, 430 66, G03G 1502

Patent

active

057970726

ABSTRACT:
An image-forming apparatus is provided which has a photosensitive member having improved temperature characteristics and improved electric properties and an ozoneless charging system in combination, and employs neither a heater nor a cleaning roller. In the apparatus, a charging member having a cylindrical multipolar magnetic body of 500 G or stronger and a magnetic brush layer formed from a magnetic powder on the peripheral surface of the magnetic body is allowed to rub the surface of a charging object in a reverse direction at a movement speed ratio of not less than 110% to charge the charging object. The charging object is a photosensitive member having a photoconductive layer composed of non-single-crystal silicon. The photoconductive layer contains hydrogen at a content ranging from 10 to 30 atomic %, and Si--H.sub.2 /Si--H at a ratio ranging from 0.2 to 0.5, having density of state ranging from 1.times.10.sup.14 cm.sup.-3 to 1.times.10.sup.16 cm.sup.-3 and characteristic energy of the exponential tail ranging from 50 to 60 meV derived from subband-gap light absorption spectrum at a light-introducing portion, and having a surface resistivity ranging from 1.times.10.sup.10 to 5.times.10.sup.15 .OMEGA.cm. The magnetic powder has a resistivity ranging from 1.times.10.sup.4 to 1.times.10.sup.9 .OMEGA.cm, and particle diameters ranging from 10 to 50 .mu.m.

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