Patent ID: 7439841

Claim:
A multi-loop transformer, comprising: a first loop comprising at least one metal plate forming a magnetic field with electric power supplied; a second loop, disposed in a concentric manner with the first loop, which generates induction current; at least one first sub-loop disposed in the concentric manner with the first loop and electrically connected to the first loop, the second loop being disposed between one of the at least one first sub-loop and the first loop; at least one electric power supply unit which supplies electric power to the at least one metal plate; and at least one second sub-loop disposed in the concentric manner with the second loop and electrically connected with the second loop, the one of the at least one first sub-loop being disposed between one of the at least one second sub-loop and the second loop, wherein, if a number of the at least one first sub-loop is n, then a number of the at least one second sub-loop is n−1.