METAL SUSBSTANCE DETECTION SYSTEM FOR DETECTING THE PRESENCE POSITION OF A METAL SUBSTANCE

摘要

A metal substance detection system which comprises a matrix sensor (20) having a group of transmission lines (22) and a group of reception lines (26) and a signal processing system (170) which drives the matrix sensor for detecting the presence and position of a metal substance. The signal processing system scans the transmission line group and the reception line group; it sends a signal current to the former and receives a reception signal from the latter for detecting the presence and position of a metal substance based on the reception signal. If some lines of either the transmission line group or the reception line group are prespecified as unscanned lines, the signal processing system skips the lines of the corresponding line group specified as the unscanned lines.