COLLECTIVE ELECTRIC WIRE, POWER TRANSMISSION DEVICE AND ELECTRONIC APPARATUS USING THE SAME, AND WIRELESS POWER TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a collective electric wire capable of reducing influences due to skin effect and proximity effect to prevent the power transmission efficiency from largely decreasing even when transmission distance between a power transmission coil and a power receiving coil is large or even when an axial displacement exists between the power transmission coil and the power receiving coil.SOLUTION: A collective electric wire 51 includes a first insulated wire 82 and a second insulated wire 83 each coated with an insulating layer. The first insulated wire is spirally wound at a first winding angle a1 forming an angle in one of a positive and a negative direction with respect to a length direction of the collective electric wire. The second insulated wire is spirally wound on the outer side of the first insulated wire at a second winding angle a2 forming an angle in the other of the positive and the negative direction with respect to the length direction of the collective electric wire. Particularly, the first insulated wire further includes a core wire 81 which is wound at the first winding angle. The sectional area of the second insulated wire is larger than the sectional area of the first insulated wire.