Color image forming apparatus

Abstract

A color image forming apparatus in which a guide member, provided between two revolving rollers around which a belt type image carrier is stretched, and on which the belt is slidably conveyed, has a large convex curvature in the direction of belt conveyance, so as to reduce friction between the belt and the guide member. A plurality of developing devices are provided to face the belt type image carrier and include magnetic rolls in which a magnetic pole facing the belt type image carrier most adjacently and one of magnetic poles next to the magnetic pole are disposed at a specific angle. The following formula is satisfied: L/R<.theta. where R is the radius of curvature of the guide member, L is the maximum length of the belt type image carrier along the circumferencial surface of the belt type image carrier facing the plurality of developing devices and .theta. represents the specific angle.

Dependencies are inferred from the claim text.