An image forming apparatus including a photoreceptor having an electroconductive substrate, a photosensitive layer overlying the electroconductive substrate, and a protection layer including an inorganic filler in an amount of from 3 to 25% by weight based on total weight of the protection layer and a binder resin, and overlying the photosensitive layer. The immersion pipe is connected to a pumping device via a tube system. A communications request is generate based on the URI. Thus, the frequency of a scanner is doubled, thus greatly overcoming difficulties in high-frequency scanning that current scanners employing a separate optical feedback structure have.