Metal detector for locating metallic body and matrix sensor used for the detector

摘要

A metal detector equipped with a matrix sensor (20) and a signal processing system (170) for driving this matrix sensor. The matrix sensor includes a plurality of transmission lines (22) and a plurality of reception lines (29) disposed in row and column, and a substrate (17) for supporting these lines. Either of the transmission line and reception line is constituted of a pair of parallel conductors (62) forming going and returning paths. The pair of conductor lines are interconnected at one end, and the open ends function as signal input/output terminals. The substrate includes a transmission terminal portion (23) and a reception terminal portion (27) for external connection, a region where the transmission lines and the reception lines are wired, a transmission line extension wiring (64) for connecting the input/output terminal to the transmission terminal portion and a reception line extension wiring for connecting the input/output terminal of the reception line to the reception terminal portion. At least one of the extension wiring for transmission and the extension wiring for reception is individually disposed for only either one of the input/output terminals of each pair of conductor lines for going and returning, and the other is disposed as a common wiring. IMAGE