| 摘要 |
According to the present invention, a developing apparatus includes: a rotatable, developer carrying body for carrying a one-component developer; a rotatable, agitating member for agitating the one-component developer, wherein the one-component developer is magnetic toner at least containing a bonding resin and magnetic iron oxide, wherein, when wettability of the magnetic toner relative to a mixture solution of methanol and water is measured at the transmittance of light having a wavelength of 780 nm, a methanol concentration at the transmittance of 80% is within the range of 45 to 65 volume %, and wherein 0.1<=b/a<=0.2 is established where a (rps) denotes the rotation speed of the developer carrying body, and b (rps) denotes the rotation speed of the agitating member.
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