Patent ID: 8269375
Filing Date: 2012-09-18
Classification: H01F,H02J

Abstract:
1. A coil unit comprising: a first coil having an outer diameter of D at least one second coil having an outer diameter of D the at least one second coil being arranged on a transmission surface side of the first coil, and a part or whole of the at least one second coil being overlapped with the first coil when viewed from the transmission surface side; a center of the at least one second coil not being coincident with a center of the first coil, as viewed from the transmission surface side; and each of the first coil and the at least one second coil being an air-core coil having an air-core section at the center thereof, and the first coil and the at least one second coil being arranged such that an outer periphery of the at least one second coil does not overlap the air-core section of the first coil.