US 5,367,365 AGranted

Image forming apparatus with charger of image carrier using magnetic brush

AssigneeKonica Corporation

InventorsSatoshi Haneda, Kunio Shigeta, Sachie Hosokoezawa, Masakazu Fukuchi, Shizuo Morita, Hiroyuki Nomori

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Abstract

An image forming machine has a charging roller on which magnetic particles are supplied to form a magnetic brush and an image forming body which is charged under the condition that the magnetic brush on the charging roller is in an alternating electric field. When the distance between a regulating member that regulates an amount of the magnetic particles passing through and the charging roller is defined to be DB and the distance between the image forming body and the charging roller is defined to be DI, an inequality of 0.7 DB.ltoreq.DI.ltoreq.1.0 DB is satisfied. More preferably, DB is in the relation of 0.2.ltoreq.DB.ltoreq.1.0 in mm.

Claims7

Dependent claims

An image forming apparatus having an image forming body, comprising:

(a) magnetic particles;
(b) a carrying sleeve for carrying the magnetic particles, thereby for forming a magnetic brush on said carrying sleeve to charge said image forming body, said carrying sleeve being provided in the vicinity of said image forming body so that said magnetic brush comes into contact with said image forming body, said magnetic brush being in an alternating electric field and moving in accordance with the rotation of said carrying sleeve;
(c) a regulating member for regulating amount of passage of said magnetic particles between said regulating member and the surface of said carrying sleeve, wherein the following inequality is satisfied;
0.7 DB.ltoreq.DI.ltoreq.1.0 DB
where DB represents the distance between said regulating member and the surface of said carrying sleeve, and DI represents the distance between the surface of said image forming body and the surface of said regulating member.

2 more elements

Dependencies are inferred from the claim text.