READING DEVICES FOR MAGNETIC TAGS

摘要

A detector for reading information stored in a magnetic tag (10) is disclosed, the reader comprising two assemblies of permanent magnets (1, 2) (each containing three magnets) (3, 4, 5, 6, 7, 8) arranged with their magnetic poles in opposition such that the magnetic poles of one triplet are physically opposite the like poles of the other triplet. The magnets are preferably elongate with their long axes being mutually parallel. The two magnet assemblies define between them a gap (9) through which, in use, a tag having magnetic material is passed. Receiver coils (11) are positioned within the gap. The magnet assemblies are preferably rigidly secured within an aluminium housing. Electrostatic screening foils may be placed over the receiver coils.