COIL UNIT, AND POWER TRANSMISSION DEVICE EQUIPPED WITH COIL UNIT

摘要

Provided is a coil unit with which the proximity effect in the coil is suppressed, with which loss resistance and a reduction in power transmission efficiency are inhibited, and with which power transmission efficiency is not significantly reduced even if a slight positional displacement is present between the primary-side coil and the secondary-side coil. A coil unit (100) is provided with: a planar spirally wound coil (111) which is formed by winding a linear conductor (110) in a spiral shape such that the line between the linear conductor (110) is a prescribed line spacing (115); and a substrate (120) for holding the planar spirally wound coil (111). If the greatest cross-sectional length of the linear conductor (110) is Wk, and the spaces between the linear conductor (110) are Ws, then Wk x 0.2 <= Ws <= Wk x 3.5.