DEVELOPING METHOD, AND DEVELOPING DEVICE USING THE DEVELOPING METHOD, IMAGE FORMING METHOD AND IMAGE FORMING DEVICE, AND DEVELOPER CARRIER USED FOR THE DEVELOPING METHOD

摘要

PROBLEM TO BE SOLVED: To appropriately electrify toner over a long term even under different environment. SOLUTION: The weight average particle size of developer is 5.0 to 12.0 μm and the developer has specified circularity distribution, and the developer carrier has base substance 106 and a conductive resin coating layer 107, and the conductive resin coating layer contains particles for forming ruggedness on the surface of a coating layer where the particles whose volume average particle size is 3.0 to 15 μm and is >=20 μm as the cumulative value of volume reference exist by <=10%, then relation between the ten-point average roughness Rz of the surface of the coating layer and the volume average particle size Dr of the particles for forming the ruggedness satisfies 2 μm< ten-point average roughness Rz<=Dr, and relation between the universal hardness value of the surface of the coating layer and that of the particles for forming the ruggedness satisfies the universal hardness value of the surface of the coating layer <=the universal hardness value of the particles for forming the ruggedness.