Patent ID: 8406645
Filing Date: 2013-03-26
Classification: G03G

Abstract:
1. An image forming apparatus of non-contact developing type comprising an image carrier, a developing roller for giving non-magnetic mono-component toner to the image carrier, wherein toner particles of the toner are within a range of toner charge quantity and a voltage application section for applying a developing bias between the image carrier and the developing roller, wherein the voltage application section applies, as the developing bias, the voltage application section sets the developing voltage Vmin so that a value defined by |Vmin−Vb| for the background area of an electrostatic latent image on the image carrier falls within a range of ±20% of Fa·d/q, where “Vb” is a potential of the background area, “Fa” is an adhesion force acting on the toner adhering to the developing roller, “d” is the interval between the image carrier and the developing roller, and “q” is an average charge quantity of the toner, so that