Patent ID: 8244164
Filing Date: 2012-08-14
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: a photoreceptor; a first developing roller including a plurality of magnetic poles and a first sleeve arrange rotatable to the first developing roller, the first developing roller developing the photoreceptor with a toner; a supplying section for supplying the toner to the first developing roller; a second developing roller including a plurality of magnetic poles and a second sleeve arranged rotatable to the second developing roller, the second developing roller arranged adjacent to the first developing roller and developing the photoreceptor with the toner supplied via the first developing roller, the second developing roller being downstream of the first developing roller, with respect to a rotational direction of the photoreceptor; an electrode arranged between the first and second developing rollers; and a voltage applying unit for applying bias voltages each having different electric potential corresponding to the first developing roller, the second developing roller and the electrode, wherein the voltage applying unit makes an absolute value of the bias voltage to be applied to the electrode larger than an absolute value of the bias voltage to be applied to the first developing roller and smaller than an absolute value of the bias voltage to be applied to the second developing roller in order that the toner adhered to the second developing roller transfers from the second developing roller to the electrode and further transfers from the electrode to the first developing roller by an electric field.