Removal control performing both first and second control in series is performed. The first control involves rotating the plurality of developer bearing members in a state in which the developing bias is applied to the plurality of developer bearing members so that force acting on opposite-polarity particles from a normally charged toner in the direction of moving the particles from the developer bearing member toward the image bearing member. The second control involves rotating one developer bearing member at a faster circumferential velocity than the other developer bearing member in a state in which the developing bias is applied to the plurality of developer bearing members or the developing bias is turned off so that the force acting on the opposite-polarity particles from the normally charged toner in the direction of moving the particles from the developer bearing member toward the image bearing member.

An image forming apparatus includes: an electrophotographic photoreceptor; a charging device that charges a surface of the electrophotographic photoreceptor; an electrostatic charge image-forming device that forms an electrostatic charge image on the charged surface of the electrophotographic photoreceptor; a developing device that stores a developer containing a toner, and supplies the developer to develop the electrostatic charge image on the surface of the electrophotographic photoreceptor into a toner image, wherein the developing device has: a first developing member that is disposed to face the electrophotographic photoreceptor, holds the developer, and transports the developer to a development region; a second developing member that is disposed downstream of the first developing member in a rotation direction of the electrophotographic photoreceptor so as to face the electrophotographic photoreceptor, holds the developer, and transports the developer to a development region; a first power source that applies, to the first developing member, a developing voltage obtained by superimposing an AC voltage on a DC voltage; and a second power source that applies, to the second developing member, a developing voltage obtained by superimposing an AC voltage on a DC voltage; a transfer device that transfers the toner image on the surface of the electrophotographic photoreceptor to a surface of a recording medium; a fixing device that fixes the toner image to the surface of the recording medium; and a control device that acquires image information regarding the toner image, and controls at least one of the first power source and the second power source according to the image information such that the AC voltage of the developing voltage applied to the second developing member has a lower frequency than the AC voltage of the developing voltage applied to the first developing member.

A developing device includes a first rotatable member to feed developer for developing an electrostatic latent image formed on an image bearing member, a second rotatable member opposed to the first rotatable member to carry and feed the developer for developing the electrostatic latent image, and a third rotatable member opposed to the second rotatable member to carry and feed the developer for collecting into a second chamber. A guiding portion is opposed to each of the second and third rotatable members to guide the developer, to a second feeding screw, peeled off from the third rotatable member by a repelling magnetic field. In a case that a shortest distance between the second rotatable member and the guiding portion is B [m], and a shortest distance between the third rotatable member and the guiding portion is C [m], the following relationship is satisfied: B+100 mC.

An image forming apparatus includes: an electrophotographic photoreceptor; a charging device that charges a surface of the electrophotographic photoreceptor; an electrostatic charge image-forming device that forms an electrostatic charge image on the charged surface of the electrophotographic photoreceptor; a developing device that stores a developer containing a toner, and supplies the developer to develop the electrostatic charge image on the surface of the electrophotographic photoreceptor into a toner image, wherein the developing device has: a first developing member that is disposed to face the electrophotographic photoreceptor, holds the developer, and transports the developer to a development region; a second developing member that is disposed downstream of the first developing member in a rotation direction of the electrophotographic photoreceptor so as to face the electrophotographic photoreceptor, holds the developer, and transports the developer to a development region; a first power source that applies, to the first developing member, a developing voltage obtained by superimposing an AC voltage on a DC voltage; and a second power source that applies, to the second developing member, a developing voltage obtained by superimposing an AC voltage on a DC voltage; a transfer device that transfers the toner image on the surface of the electrophotographic photoreceptor to a surface of a recording medium; a fixing device that fixes the toner image to the surface of the recording medium; and a control device that acquires image information regarding the toner image, and controls at least one of the first power source and the second power source according to the image information such that the AC voltage of the developing voltage applied to the second developing member has a lower frequency than the AC voltage of the developing voltage applied to the first developing member.

A developing device includes a first rotatable member to which developer is delivered, a second rotatable member provided opposed to the first rotatable member, to which the developer is delivered from the first rotatable member by a magnetic field generated by a first magnet, to carry and feed the developer, and a third rotatable member provided opposed to the second rotatable member, to which the developer is delivered from the second rotatable member. A guiding portion is provided opposed to the second and third rotatable members to guide the developer peeled off from the third rotatable member by a repelling magnetic field generated by a third magnet. Where a shortest distance between the second rotatable member and the guiding portion is B [m], and a shortest distance between the third rotatable member and the guiding portion is C [m], the following relationship is satisfied: B+100 m<C.

A developing apparatus includes a developing roll that holds developer and is rotated; an image holder that is disposed to face the developing roll and is rotated; and a suction duct that is provided with a suction port formed to correspond to at least both end portions of the developing roll, sucks the developer from an image holder side via the suction port, and has a developer separation structure that is disposed adjacent to the suction port and separates the developer from an airflow by changing a direction of the airflow in the suction duct.

A first maximum position where a magnetic flux density of a first magnetic pole is maximum is positioned downstream of a first developing position and upstream of a first closest position. A second maximum position where a magnetic flux density of a third magnetic pole is maximum is positioned downstream of a second closest position and upstream of a second developing position. A relationship of r11>r22 is satisfied, in a case where r1 represents a radius of a first rotatable developing member, r2 represents a radius of a second rotatable developing member, 1 represents an angle from the first maximum position to the first closest position in the rotational direction of the first rotatable developing member, and 2 represents an angle from the second closest position to the second maximum position in the rotational direction of the second rotatable developing member.