OPC is short for Organic Photoconductor. OPC drum is a photoelectric converter device formed by coating OPC material on the surface of conductive aluminum cylinder. Its characteristics are that it is an insulator in the dark and can maintain a certain amount of static charge. When a certain wavelength of light is irradiated, it becomes a conductor, releases charge through the aluminum base, and forms an electrostatic potential image. It is the core component of shock.