Patent ID: 6941100

Claim:
A developing device comprising: toner having at least two peaks in particle-size distribution in which particle-number distribution is adopted as a distribution reference, and in which a particle size of said toner that constitutes a largest peak among said peaks is larger than a particle size of said toner that constitutes a second largest peak among said peaks; and a movable developer bearing member for bearing said toner, said developer bearing member having a multitude of depressions on its surface, wherein: said developing device being capable of developing a latent image with said toner borne by said developer bearing member, said latent image being borne by an image bearing member, each of said depressions having a multitude of protrusions on its surface, and a diameter of said protrusions of said developer bearing member in its moving direction being smaller than the particle size of said toner that constitutes said second largest peak.