Patent ID: 6505014
Filing Date: 2003-01-07
Classification: G03G

Abstract:
An image forming apparatus comprising:an image carrier including a photoconductive layer formed on a conductive base; latent image forming means for uniformly charging a surface of said image carrier and then scanning said surface with a light beam in accordance with image data to thereby form a latent image; a developing device for depositing toner on a toner carrier, which includes a conductive base, and causing said toner carrier to convey said toner to a developing position where said toner carrier faces said image carrier to thereby develop the latent image and produce a corresponding toner image; a power supply for applying a bias VB for development to said conductive base of said toner carrier; and an image transferring device for transferring the toner image from said image carrier to a recording medium; wherein assuming that a capacity and a resistance between said conductive base of said toner carrier and a surface of said photoconductive layer in the developing position are CD (F/cm2) and RD (&OHgr;/cm2), respectively, that said photoconductive layer has a capacity of CP (F/cm2) and a resistance, as measured in a thickness of direction, of RP (&OHgr;/cm2), and that a potential for development that is a difference between a potential VL of an image portion of said image carrier and the bias VB (VLâˆ’VB) is 300 V or below in absolute value, then CD, RD, CP, and RP, are selected such that an amount of charge QP to be charged into said capacity CP for a unit area within a period of time in which the surface of said image carrier moves away from the developing position is 2.5Ã—10âˆ’9 C/cm2 in absolute value.