Patent ID: 8211602

Claim:
An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor comprises an organic charge transport material which satisfies 200 (Å 3 )>αcal>55 (Å 3 ) where αcal is polarizability by calculation for structural optimization by semiempirical molecular orbital calculation using AM1 parameters and which satisfies 0.2 (D)<Pcal<2.1 (D) where Pcal is a dipole moment by calculation for structural optimization by semiempirical molecular orbital calculation using AM1 parameters; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image comprising toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 μm to 7.0 μm; and a relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 μm to 3.56 μm satisfies formula (1): Dns≦ 0.233EXP(17.3 /Dv 50) (1) where Dv50 is a volume median diameter (μm) of the toner, and Dns is a percentage in number of toner particles having a particle diameter of from 2.00 μm to 3.56 μm, wherein in the toner for developing an electrostatic charge image, the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 μm to 3.56 μm is from 1.83 to 5.87%.