Contact-type electroconductive brush for electrically charging a

Details Contact-type electroconductive brush for electrically charging a Contact-type electroconductive brush for electrically charging a

1992-11-05

1994-03-15

Grimley, A. T.

Photocopying

Contact printing

Light boxes

361221, 361225, G03G 1502

Patent

active

052949621

ABSTRACT:
An image forming apparatus includes an image carrier which is rotated in a predetermined direction, a brush charger which charges a surface of the carrier, an exposure unit which forms an electrostatic latent image on the charged surface of the carrier in accordance with image information supplied thereto, a developer which develops the electrostatic latent image with a toner, and a transfer unit which transfers a toner image from the surface of the carrier onto a transfer medium supplied thereto. The image carrier includes a conductive main body, an undercoat having a predetermined electric resistance higher than that of the main body, and a photosensitive layer, which is formed on the undercoat, and on which an electrostatic latent image is formed by the exposure unit after charging is performed by the charger. The charger includes a main body constituted by bristles consisting of conductive fibers having electric resistance within the range from about 10.sup.6 to about 10.sup.9 .OMEGA./cm, a conductive base cloth, which has an electric resistance lower than that of each of the brush bristles, and on which the bristles are furnished, and a base member to which the base cloth is fixed, and a voltage applying unit for applying a predetermined voltage to the base cloth. And, the bristles contact the photosensitive layer of the carrier by a predetermined length.

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