Patent ID: 8620184

Claim:
An image forming apparatus, comprising: a positively-charged single layer type electrophotographic photoreceptor; a charging device that has a contact charging member for charging a surface of the photoreceptor; an exposure device for exposing the charged surface of the photoreceptor to light to form an electrostatic latent image on the surface of the photoreceptor; a developing device for developing the electrostatic latent image into a toner image; and a transfer device for transferring the toner image from the photoreceptor to a transferred body, wherein the positively-charged single layer type electrophotographic photoreceptor has a conductive substrate and a photosensitive layer, the photosensitive layer contains a charge generating agent, a charge transport agent and a binder resin together, the binder resin having a yield point strain of 9 to 29%, the contact charging member is a charging roller that has a conductive layer with a thickness of 1 mm to 3 mm, and the binder resin is a polycarbonate resin having a viscosity-average molecular weight of 55,000 to 75,000 and a recurring unit expressed by one of the formulae (15) to (17): wherein the number â€œ50â€ in the formula (17) indicates that the binder resin of the formula (17) is copolymerized at a copolymerization ratio of 50%.