Patent ID: 6782226
Filing Date: 2004-08-24
Classification: G03G

Abstract:
A mono-component developing device for developing an electrostatic latent image formed on an image bearing member comprising:a toner bearing member holding a toner on its surface for conveyance of the toner to a development region where the toner bearing member opposes the image bearing member via a predetermined gap therebetween a regulating member pressed against the surface of the toner bearing member for regulation of the amount of toner conveyed to the development region; and a developing bias source for applying an alternating electric field between the toner bearing member and the image bearing member, wherein the toner bearing member includes a conductive substrate formed with an elastic layer, an intermediate layer and a surface layer on the surface thereof, respective volume resistances &rgr;1, &rgr;2 and &rgr;3 of which layers satisfy a condition &rgr;2&lE;&rgr;1&lE;&rgr;3, the toner bearing member having an arithmetic average surface roughness in the range of 0.8 to 2.5 &mgr;m, and wherein the toner has a volume-average particle size in the range of 3 to 8 &mgr;m.