Patent ID: 7979010
Filing Date: 2011-07-12
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a latent image bearing member, a latent electrostatic image forming unit configured to form a latent electrostatic image on the latent image bearing member, a developing unit which comprises a developing roller for supplying a toner to the latent electrostatic image and a supply roller for supplying the toner to the developing roller and is configured to develop the latent electrostatic image to form an visible image, and a transfer unit configured to transfer the visible image onto a recording medium, 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, wherein the toner comprises a binder resin, a wax, and a colorant with the wax having a melting point of 75° C. or less; an amount of the wax exposed wax 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 inequation, 20/R <T<27/R, at a void rate of 58% as measured by a torque measurement method using a conical rotor.