DEVELOPER CARRIER, AND DEVELOPING DEVICE AND PROCESS CARTRIDGE USING DEVELOPER CARRIER

摘要

PROBLEM TO BE SOLVED: To provide a developer carrier capable of applying appropriate electrified amount to toner over a long term even under different environment by preventing the charge-up phenomenon of toner and a blotch by the toner, and a developing device or the like using the developer carrier.;SOLUTION: As for the developer carrier having a resin coating layer on the surface of base substance, the resin coating layer incorporates at least binding resin and graphite particles, and a mean value A and standard deviation σobtained from the hardness distribution of a universal hardness measured value HU in the surface coating film material test of the surface of the coating layer calculated by a following expression (1) satisfy 100≤A≤800 [N/mm²] and 30≤σ≤90 [N/mm²].;COPYRIGHT: (C)2004,JPO