Patent ID: 8346132
Filing Date: 2013-01-01
Classification: G03G

Abstract:
1. An image forming unit, comprising: a rotatable electrostatic latent image carrier; a charge member that is positioned to contact the electrostatic latent image carrier and that charges a surface of the electrostatic latent image carrier; and a developing part that supplies a developer to the electrostatic latent image carrier for obtaining a developer image, wherein the charge member includes a conductive elastic layer and a surface layer formed on a circumferential surface of the conductive elastic layer; the surface layer contains particles having an average particle size of 5 μm-20 μm; a ratio of a surface area per unit area of the surface layer is in a range from 1.5 to 3.0, the ratio of the surface area per unit area of the surface layer is calculated from a formula Ss/Sa; and the surface area of the surface layer is Ss and the area of the surface layer is Sa.