FOREIGN OBJECT DETECTION DEVICE, POWER TRANSMISSION DEVICE, POWER RECEPTION DEVICE, AND POWER TRANSFER SYSTEM

To reduce an induced voltage caused by a magnetic flux generated at a power transmission coil, in foreign object detection.SOLUTION: A foreign object detection device 2 includes: a plurality of coils 240 each including a first conductive pattern arranged on one surface of a detection coil substrate 220 to be excited and thus generate a vibration signal; a detector 26 to detect the existence of a foreign object based on the vibration signal; a first connecting wire 230 to connect one terminal T1 of the individual coils 240 to the detector; and a second connecting wire 232 to connect the other terminal T2 of the individual coils 240 to the detector 26. The first connecting wire 230 and the second connecting wire 232 have substantially identical paths at least on the detection coil substrate 220.SELECTED DRAWING: Figure 2 【課題】異物検出において、送電コイルが発生する磁束により生じる誘起電圧を抑制する。【解決手段】異物検出装置２は、検出コイル基板２２０の一面に配置された第１導体パターンを備え、励磁されて振動信号を発生する複数のコイル２４０と、振動信号に基づき、異物の有無を検出する検出部２６と、複数のコイル２４０それぞれの一方の端子Ｔ１と検出部とを接続する第１接続配線２３０と、複数のコイル２４０それぞれの他方の端子Ｔ２と検出部２６とを接続する第２接続配線２３２と、を備える。第１接続配線２３０と第２接続配線２３２とは、少なくとも検出コイル基板２２０上において、経路が互に実質的に同一である。【選択図】図２