Development device for an electrostatic latent image

An image forming apparatus that is able to execute image formation comprising:

• an image bearing member;
• a developing device including:
• a rotatable developing member configured to carry and feed a developer including toner and carrier toward a position where an electrostatic image formed onto the image bearing member is developed;
• a magnet fixedly arranged inside the rotatable developing member, including a plurality of magnetic poles, and configured to generate a magnetic field for separating the developer that has passed the position where the electrostatic image formed onto the image bearing member is developed from an outer circumferential surface of the rotatable developing member, the plurality of magnetic poles including
• a first magnetic pole arranged closest to the position where the electrostatic image formed onto the image bearing member is developed,
• a second magnetic pole arranged downstream of the first magnetic pole with respect to a rotational direction of the rotatable developing member,
• a third magnetic pole arranged upstream of the first magnetic pole and downstream of the second magnetic pole with respect to the rotational direction of the rotatable developing member so as to be adjacent to the second magnetic field, and having a same polarity as the second magnetic pole, and
• a conductive member arranged downstream of the position where the electrostatic image formed onto the image bearing member is developed and upstream of the second magnetic pole with respect to the rotational direction of the rotatable developing member so as to face the outer circumferential surface of the rotatable developing member;
• and
• a bias application unit configured to apply only a direct-current voltage to the conductive member and to apply only a direct-current voltage to the rotatable developing member,
• wherein, during the image formation, the bias application unit applies only a direct-current voltage to the conductive member and applies only a direct-current voltage to the rotatable developing member so that a direct-current voltage applied to the conductive member has a same polarity as a normal charge polarity of the toner, a direct-current voltage applied to the rotatable developing member has a same polarity as the normal charge polarity of the toner, and an absolute value of a direct-current voltage applied to the conductive member is greater than an absolute value of a direct-current voltage applied to the rotatable developing member.