Image forming apparatus and image forming method

An image forming apparatus comprising:

• an image carrier having a photosensitive surface layer;
• a developing device for making a toner image by developing a latent image formed on the image carrier by using a toner comprising resin particles, which are obtained through particle formation in an aqueous medium;
• a transfer device for transferring the toner image on the image carrier onto a transfer material;
• and
• a cleaning device for removing residual toner remaining on the image carrier after transferring,
• wherein the cleaning device comprises:
• a cleaning roller having a conductive or semi-conductive resilient body;
• a cleaning blade made of a resilient material and provided downstream the cleaning roller in the moving direction of the image carrier;
• a power source to apply a bias voltage on the cleaning roller;
• and
• a collecting member to collect the toner removed by the cleaning roller;
• and wherein the absolute value of the charge amount of the toner used in the image forming apparatus is not less than 20 μC/g and not more than 50 μC/g.