| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a developing device capable of suppressing surface stain and device deterioration due to toner scattering as compared with conventional ones, and to provide an image forming apparatus with this developing device. <P>SOLUTION: In the developing device comprising a photoreceptor 1, a developing vessel 40 in which an opening 40a facing the photoreceptor 1 has been formed, and a developing roller 44 which is located in the developing vessel 40 in such a way that it is partly exposed from the opening 40a, bears a two-component developer 43 comprising toner 41 and carrier 42 as a magnetic brush on a surface through a built-in magnetic field generating means, and supplies only the toner to a latent image on the photoreceptor 1 in a developing region opposite to the photoreceptor 1, a number ratio of weakly charged toner in which the product of the electrostatic attraction Fq of the toner 41 to the carrier 42 in the two-component developer 43 and a coefficient μ of dynamic friction between the toner and carrier is below the maximum value of inertia force applied to the toner 41 in the opening 40a is made ≤10[%]. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
