JPH05303268

PURPOSE:To provide the image forming device with which stable images are obtd. by sufficiently electrostatically charging the developer transported on a developing roller while sufficiently assuring the contact area of the developing roller and a photosensitive drum and which is long in life in a contact development method using the nonmagnetic one-component developer. CONSTITUTION:The developing roller of the image forming device by the contact development method using the elastic developing roller is constituted of a metallic shaft 55 for driving and a foam 53 molded to a roller shape on the outer periphery of this metallic shaft 55. The sufficient contact area X with the photosensitive drum 4 by the elasticity of the foam 53 is assured and the sufficient decleasing of the thickness of the layer of the developer 5 by a layer regulating blade 41 on the surface of the foam 53 are easily and sufficiently attained by setting the cell diameter on the surface of the foam 53 sufficiently smaller than the grain size of the developer 5 to be used. The electrostatically charged developer 5 is thus supplied in the time sufficient for developing the electrostatic latent image formed on the surface of the photosensitive drum 4.