Abstract: A color electrophotographic apparatus which can achieve full color image reproduction with one-pass developing is disclosed. According to the present invention, a flexible photoconductor is formed as an endless belt driven by a set of rollers. Developers of various colors are projected onto a surface of the photoconductor from a plurality of developing units. After the projection of the color developers is achieved, the resultant full color toner image is transferred to a recording medium. The toner image is then fused onto the recording medium, thereby reproducing the full color image. The flexible photoconductor is arranged to have a planar surface between the two rollers, with the four optical exposure units positioned to direct four parallel beams of light in a direction perpendicular to the planar printing surface of the photoconductor.

Abstract: The specification discloses an electrophotographic image forming system. The system includes a photoconductor connected to a first electric potential constituting substantially an elongated cylindrical drum provided for rotating around an axis along an elongated direction of the cylindrical drum having an external charging surface disposed thereon. The electrophotographic system further includes a non-contact charger which includes a plurality of mutually insulated conductive films each having a sharp edge pointing perpendicularly to the charging surface. The non-contact charger further includes a packaging frame for securely attaching to and supporting the plurality of mutually insulated conductive films thereon. The plurality of mutually insulated conductive films are connected to a second electric potential different from the first electric potential for activating an electric discharge between the sharp edges of the conductive film and the charging surface.

Abstract: A developing unit includes a housing enclosing a mesh belt stretched across first and second rollers. The belt passes between a pair of friction plates that can be used to tribocharge toner particles carries on the mesh belt. Charging occurs over the large width of the entire mesh belt and the friction plates. Toner is transported on the surface of the mesh belt to a developing roller which, in turn, transports the toner to the surface of a photoconductor. The configuration of this developing unit reduces the loading associated with the tribocharging operation and the belt transport system reduces the volume of the developing unit.