An image forming apparatus having a structure to prevent print defects caused by residual paper. The thickness of said coating is in total maximally 25 \u03bcm, the hardness of said coating is at least 600 HV and the tensile strength of the steel strip substrate is at least 1200 MPa. Then, parallel light 3 is obliquely at an angle of incidence on the photosensitive material 1 while parallel light 4 is vertically incident on the diffusing plate 2. The container has a discharge opening in the wall adjacent to the floor. The control unit is connected to the second power input and output ports, and the second power input port is connected to the first power output port, and the control unit is provided for controlling an output voltage value of the second power output port.