| 摘要 |
A developing device is disposed facing an image bearing body that bears a latent image. The developing device includes a developer bearing body that bears a developer for developing the latent image. The developer includes mother particles and external additives. A liberation amount T (weight parts) of the external additives liberated from the mother particles with respect to 100 weight parts of the mother particles, a surface roughness Rz (m) of the developer bearing body, and a circumferential speed Vd (mm/s) of the developer bearing body satisfy the following relationships: <?in-line-formulae description="In-line Formulae" end="lead"?>1.326x10-1<=T<=2.142x10-1(weight parts),<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>7.1x10-6<=Rz<=15.0x10-6(m),<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>161.5<=Vd<=189.2(mm/s), and<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>4.98x10-6<=(TxRz/Vd)<=1.99x10-5(s).<?in-line-formulae description="In-line Formulae" end="tail"?>
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