Patent ID: 8221950

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 azo compound; 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 a 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 the volume median diameter (μm) of the toner, and Dns is the percentage in number of toner particles having a particle diameter of from 2.00 μm to 3.56 μm, wherein an exposure light of an exposure means for forming an electrostatic latent image is a monochromatic light having an exposure wavelength of from 380 to 500 nm, 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%.