Patent ID: 8685608

Claim:
A two-component developer comprising: a toner; a carrier having a surface energy of from about 23 dyne/cm to about 37 dyne/cm; and an external additive having a shape factor SF1 of from about 130 to about 150 and a number-average particle diameter of from about 80 nm to about 1 Î¼m; wherein: an existence ratio A of the external additive on a surface of the toner and an existence ratio B of the external additive on a surface of the carrier satisfying the relationship of the following Expression 1: 0.04 â‰¦B/Aâ‰¦ 0.4;â€ƒâ€ƒExpression 1: the carrier comprises a core and a coating layer thereon; and the coating layer comprises a resin selected from the group consisting of a perfluorohexylethyl methacrylate/methyl methacrylate copolymer, a perfluorobutylethyl methacrylate/methyl methacrylate copolymer, isobornyl methacrylate, adamantane methacrylate, and alkoxysilyl methacrylate.