Developing device and image forming apparatus

A developing device visualizing an electrostatic latent image previously formed on the surface of an image carrier as toner image, comprising:

• a magnetic roller carrying and conveying a two-component developer containing a toner and a carrier;
• a developing roller placed at a position facing the image carrier and the magnetic roller that carries the toner in the two-component developer on the surface or in close proximity to the two-component developer conveyed by the magnetic roller, conveys and flies the conveyed toner onto the surface of the image carrier;
• and
• a resin layer coated on the surface of the developing roller, wherein
• the absolute value of the difference in charge between the toners in the upper and lower layers of the toner layer formed on the developing roller as the toner is carried on the developing roller is 6 μC/g or less.

An image forming apparatus;

• comprising:
• an image carrier forming an electrostatic latent image thereon;
• a developing roller placed at a position facing the image carrier, carrying a toner on the surface thereof, conveying the toner, and flying the conveyed toner onto the surface of the image carrier;
• and
• a resin layer coated on the surface of the developing roller, wherein
• the absolute value of the difference in charge between the toners in the upper and lower layers of the toner layer formed on the developing roller as the toner is carried on the developing roller is 6 μC/g or less.