| 摘要 |
PROBLEM TO BE SOLVED: To provide a coil unit, a wireless power supply device, a wireless power reception device and a wireless power transmission device, capable of suppressing a high induced voltage which occurs at a metallic part.SOLUTION: A coil unit Lu1 includes: a power transmission coil L1; reactance circuits X10, X11 which form a resonant circuit with the power transmission coil L1; and a metal part SD disposed on the back side of the power transmission coil L1. A ratio M of a first reactance value of the first reactance circuit X10 to a second reactance value of the second reactance circuit X11 is set based on a ratio of a mean distance between a coil and the metal part from one end to the center part of the coil to a mean distance between the coil and the metal part from another end to the center part of the coil.SELECTED DRAWING: Figure 2 |
