Apparatus and method for magnetising security targets

Details Apparatus and method for magnetising security targets Apparatus and method for magnetising security targets

1997-08-08

1999-09-14

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

325284, G08B 1314

Patent

active

059529237

ABSTRACT:
In one aspect the purpose of the apparatus is to create a magnetic field suitable for the conditioning of security targets composed small spring steel strips with a long permalloy backing of the type normally used in library books. This apparatus includes a row of coils which are energized progressively along the row in a time overlapped sequence. This creates a magnetic field at any point above the coils which remains substantially parallel to the target whilst the field strength decays from a magnetically saturating value to below a strength at which it has significant influence on the condition of the steel strips.

REFERENCES:
patent: 4249167 (1981-02-01), Purinton et al.
patent: 5126720 (1992-06-01), Zhou et al.
patent: 5151843 (1992-09-01), Sanetra et al.
patent: 5410296 (1995-04-01), Montbriand et al.
patent: 5500640 (1996-03-01), Zhou et al.
patent: 5521583 (1996-05-01), Frahm et al.

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