Patent ID: 8391737

Claim:
An image forming apparatus comprising: an image carrier; a charging device, applied with a charging voltage, charging a surface of the image carrier; an exposure device forming a latent image by allowing the charged surface of the image carrier to be exposed to light thereof; a developer carrier, applied with a development voltage, forming a developer image by development of the latent image by allowing a developer to be adhered to the image carrier; a developer supplying member, applied with a supply voltage, supplying the developer to the developer carrier; a developer regulation member, applied with a regulation voltage, regulating an amount of the developer on the developer carrier; and a voltage controller controlling the charging voltage, the development voltage, the supply voltage, and the regulation voltage, wherein the developer carrier has thereon the developer having a charge amount Q/M, the charge amount Q/M satisfying 25 [μC/g]≦|Q/M|≦40 [μC/g], and wherein the image carrier has a surface potential Vopc, the development voltage is expressed as Vdb, and the developer carrier has a developer layer potential Vtnr thereon, the developer layer potential Vtnr relative to a difference between the surface potential Vopc and the development voltage Vdb being expressed by a ratio γ satisfying 0.1≦γ≦0.2.