Patent ID: 8068772

Claim:
A development device comprising: a developer carrier supplying developer to a rotatable electrostatic latent image carrier, the developer carrier comprising: a conductive metal core; and a conductive elastic layer disposed outside a circumference of the conductive metal core and including a surface having a roughness formed thereon, the surface of the conductive elastic layer satisfying a relationship of 1.0<Rz2/Rz1<1.60, where Rz1 is a ten-point mean roughness in a circumference direction of the developer carrier and Rz2 is a ten-point mean roughness in an axial direction of the developer carrier, and satisfying a relationship of 0.20<Sm2/Sm1<1.00, where Sm1 is a mean width of profile elements of the surface of the conductive elastic layer in the circumference direction of the developer carrier, and Sm2 is a mean width of profile elements of the surface of the conductive elastic layer in the axial direction of the developer carrier, wherein a value of Rz1 is from 6.58 to 12.01 μm, wherein a value of Rz2 is from 6.89 to 17.31 μm, wherein a value of Sm1 is from 38.00 to 177.00 μm, and wherein a value of Sm2 is from 8.00 to 143.10 μm.