Patent ID: 8647804

Claim:
A method of preparing carrier for electrophotography including a core material and a coating material layer, the method comprising: coating a coating material of the coating material layer on the core material; providing an induction heater including a first circuit and a second circuit, the first circuit being positioned in a location parallel to the second circuit of the induction heater, and the first circuit having a first conductive wire and the second circuit having a second conductive wire, wherein the first conductive wire has a first coil shape including a first number of coil turns and the second conductive wire has a second coil shape including a second number of coil turns; alternately applying current to the first and second circuit of the induction heater and generating a magnetic line that changes direction and intensity; and burning the coating material by inductively heating the core material by the step of alternately applying current to the first circuit and second circuit of the induction heater.