Patent ID: 7320852

Claim:
A carrier for use with a toner as a two-component developer for developing an electrostatic image, comprising: spherical magnetic core particles, and a resin layer covering each of said core particles and containing at least a first resistance controlling material and a second resistance controlling material, wherein the first resistance controlling material and the second resistance controlling materials have different specific resistances, wherein each of said first and second resistance controlling materials is in the form of particles having a number average particle diameter of no more than 1/10 of a number average particle diameter of the toner, wherein either the first or the second resistance controlling material is an Sn-doped titania, and wherein the first resistance controlling material has a specific resistance of 1×10 3 Ω·cm or less and the second resistance controlling material has a specific resistance of 5×10 7 Ω·cm or less.