Abstract: A charging device includes a charging member contactable to said member to be charged to charge a member to be charged. Wherein a voltage is applicable to said charging member; a resistor provided in a charging circuit for applying the voltage to said charging member; wherein said resistor has a resistance not less than 0.5 times a resistance of said charging member; wherein a combined resistance of said charging circuit and said charging member is not more than 10.sup.7 .OMEGA..

Abstract: An image forming apparatus includes an image bearing device, a charger contactable to the image bearing device for effecting contact charging of the image bearing device, the charger being supplied with a voltage having a DC component and an AC component, and the charger being provided with an electrode for receiving the voltage; wherein the following is satisfied: when an electric field formed between the image bearing device and the electrode is not more than .vertline.E/d.sub.SD .vertline. (V/m), a resistance of the charger per unit area of contact between the image bearing device and the charger is larger than20E/(wCV.sub.DC) (.OMEGA.m.sup.2)and is larger than the resistance when the electric field is more than .vertline.(E+V.sub.DC)/d.sub.SD .vertline. (V/m)where E(V) is an amplitude of the AC component; w(rad) is an angular velocity of the AC component; d.sub.SD (m) is a minimum distance between the electrode and the image bearing device; C(F/m.sup.