Image forming apparatus

An image forming apparatus comprising:

• a rotatable image bearing member about a rotational axis extending in the axial direction thereof;
• a charging member configured to form a charging portion between itself and the image bearing member and to charge a surface of the image bearing member;
• an accommodating portion configured to accommodate toner charged to a predetermined polarity;
• a developing member configured to form a developing portion between itself and the image bearing member and to form a toner image on the image bearing member by supplying the toner to the image developing portion;
• a transfer portion contacting the surface of the image bearing member and configured to transfer the toner image;
• a collecting member configured to collect a deposited matter deposited on the surface of the image bearing member in contact with the surface of the image bearing member, and
• a cleaning member configured to remove the deposited matter in contact with the surface of the image bearing member,
• wherein with respect to the axial direction, when B is defined as an effective charging width with which the charging member is capable of charging the surface, C is defined as a collection contacting width with which the collecting member contacts the surface, and D is defined as a cleaning contacting width with which the cleaning member contacts the surface, the following formula is satisfied:
• B<D<C, and
• wherein with respect to the axial direction, a surface potential of the surface in an area outside the cleaning contacting width, inside the collection contacting width and in contact with the collecting member is a first potential larger than 0V in the same polarity direction as the predetermined polarity.