Patent ID: 7725056

Claim:
A developing device configured to develop latent images to toner images, comprising: a toner transporter including an electrostatic transport substrate on a surface, configured to receive toner particles onto the electrostatic transport substrate and configured to move in order to carry toner particles floating on the electrostatic transport substrate to a latent image carrier; and a two-component developer bearer configured to carry a two-component developer to the toner transporter, wherein a surface of the electrostatic transport substrate is coated by a coating layer the coating layer including a material configured to charge toner particles in contact with the electrostatic transport substrate to regular polarity, and the two-component developer bearer and the toner transporter are arranged and controlled in accordance with the following relation: ρ· a/d> 4 mg/mm 3 , wherein d is a distance measured in mm between the two-component developer bearer and the toner transporter, ρ is a weight measured in mg of the two-component developer on the two-component developer bearer in an area of 1 mm 2 , and a is a ratio of speeds where a peripheral speed of the toner transporter is divided by a peripheral speed of the two-component developer bearer.