Patent ID: 7471924

Claim:
A cleaning unit that removes residues left on the surface of a photoreceptor after a toner image is transferred to an image transferring object's surface, the photoreceptor carrying the toner image to a predetermined transfer area by moving the surface of the photoreceptor cyclically while carrying the toner image intended to be transferred to the image transferring object's surface in the predetermined transfer area, comprising: a cleaning blade that keeps a front end thereof made of rubber material in contact with the surface with a pressure so as to scrape residual toner left on the surface after the toner image is transferred to the image transferring object's surface; and a fiber body having multiple fibers in contact with the surface after the toner image is transferred to the image transferring object's surface in the upstream in the cyclic moving direction of the surface of the photoreceptor with respect to the cleaning blade, wherein the cleaning blade satisfies A≧− 2.5 ×B+ 102: formula (1) 6.3≦B≦19.6: formula (2) where in the above formula (1), A designates a contact angle (°) with pure water under 23° C., 55% RH and B designates 100% modulus (MPa) at 23° C.