Abstract: An optical scanning system includes a first lens for receiving a light beam from a light source and allowing the light beam to pass therethrough, and a polygon mirror having at least one reflection surface for deflecting the light beam from the first lens by reflecting the light beam on the reflection surface thereof. A second lens is provided for receiving the light beam from the polygon mirror and focusing the light beam on a first plane to be scanned. The second lens has a first surface facing toward the polygon mirror and a second surface facing toward the first plane.

Abstract: The present invention provides a process cartridge having components which are easy to assemble and disassemble and are convenient to reuse. A process cartridge of the present invention comprises a first unit having a photosensitive drum; a second unit having a cleaning means for the photosensitive drum; and wherein the first unit and the second unit are rotatably hinged to each other by a coupling shaft projecting from the side wall of the first unit and a coupling hole perforating the side wall of the second unit. The second unit is fixed at a position where the hinged rotation of the second unit in a predetermined direction with respect to the first unit is stopped.