| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus and an image forming method capable satisfying both superior fixing property and superior adhesion resistance and forming favorable images even when using a developing roller and a supply roller each having a diameter as small as 12 mm or less. <P>SOLUTION: The image forming apparatus includes at least a latent image bearing member, a latent electrostatic image forming unit, a developing unit which includes at least a developing roller supplying a toner to a latent electrostatic image to develop and a supply roller supplying the toner to the developing roller, and a transfer unit, wherein both of a diameter R (mm) of the developing roller and a diameter R' (mm) of the supply roller are 12 mm or less; the toner contains at least a resin, a wax, and a colorant with the wax having a melting point of 75°C or less; an amount of the wax exposed on a surface of the toner is 10 mg/g to 30 mg/g; and when a diameter (mm) of the developing roller is represented by R the toner has a torque T (mNm) satisfying the inequality 20/R<T<27/R, at a void rate of 58% as measured by a torque measurement method using a conical rotor. <P>COPYRIGHT: (C)2009,JPO&INPIT |
