Patent ID: 7206539
Filing Date: 2007-04-17
Classification: G03G

Abstract:
1. A non-magnetic single component developing device comprising: a developing roller that is in contact with a surface of a photoreceptor and supplies toner to an electrostatic latent image on the surface of the photoreceptor; a regulating blade that is in contact with a circumferential surface of the developing roller and forms a toner thin film on the circumferential surface of the developing roller; and a supplying roller that is in contact with the circumferential surface of the developing roller and supplies toner to the circumferential surface of the developing roller, in which the toner formed into a thin film by the regulating blade in the circumferential surface of the developing roller is supplied to the surface of the photoreceptor that is in contact with the circumferential surface of the developing roller to turn the electrostatic latent image into a toner image, wherein the supplying roller contains a rubber foam at least in its surface layer portion, the rubber foam including closed cells and open cells and having a foam ratio (porosity) of 0.75 to 0.85 and an average foam cell diameter of 300 to 500 μm.